Libraries: Move to Userland/Libraries/

Userland/Libraries/LibC/CMakeLists.txt

@@ -0,0 +1,90 @@
+set(LIBC_SOURCES
+    arpa/inet.cpp
+    assert.cpp
+    ctype.cpp
+    cxxabi.cpp
+    dirent.cpp
+    dlfcn.cpp
+    fcntl.cpp
+    getopt.cpp
+    grp.cpp
+    ioctl.cpp
+    libcinit.cpp
+    libgen.cpp
+    locale.cpp
+    malloc.cpp
+    mman.cpp
+    mntent.cpp
+    netdb.cpp
+    poll.cpp
+    pwd.cpp
+    qsort.cpp
+    scanf.cpp
+    sched.cpp
+    serenity.cpp
+    setjmp.S
+    signal.cpp
+    spawn.cpp
+    stat.cpp
+    stdio.cpp
+    stdlib.cpp
+    string.cpp
+    strings.cpp
+    syslog.cpp
+    sys/prctl.cpp
+    sys/ptrace.cpp
+    sys/select.cpp
+    sys/socket.cpp
+    sys/uio.cpp
+    sys/wait.cpp
+    termcap.cpp
+    termios.cpp
+    time.cpp
+    times.cpp
+    ulimit.cpp
+    unistd.cpp
+    utime.cpp
+    utsname.cpp
+    wchar.cpp
+)
+
+file(GLOB AK_SOURCES CONFIGURE_DEPENDS "../../../AK/*.cpp")
+file(GLOB ELF_SOURCES CONFIGURE_DEPENDS "../LibELF/*.cpp")
+set(ELF_SOURCES ${ELF_SOURCES} ../LibELF/Arch/i386/plt_trampoline.S)
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -Wno-unknown-warning-option -DSERENITY_LIBC_BUILD")
+
+find_program(INSTALL_COMMAND ginstall)
+if(NOT INSTALL_COMMAND)
+    set(INSTALL_COMMAND install)
+endif()
+
+add_library(crt0 STATIC crt0.cpp)
+add_custom_command(
+    TARGET crt0
+    COMMAND ${INSTALL_COMMAND} -D $<TARGET_OBJECTS:crt0> ${CMAKE_INSTALL_PREFIX}/usr/lib/crt0.o
+)
+add_library(crt0_shared STATIC crt0_shared.cpp)
+add_custom_command(
+    TARGET crt0_shared
+    COMMAND ${INSTALL_COMMAND} -D $<TARGET_OBJECTS:crt0_shared> ${CMAKE_INSTALL_PREFIX}/usr/lib/crt0_shared.o
+)
+
+set_source_files_properties (ssp.cpp PROPERTIES COMPILE_FLAGS
+    "-fno-stack-protector")
+add_library(ssp STATIC ssp.cpp)
+add_custom_command(
+    TARGET ssp
+    COMMAND ${INSTALL_COMMAND} -D $<TARGET_OBJECTS:ssp> ${CMAKE_INSTALL_PREFIX}/usr/lib/ssp.o
+)
+
+set(SOURCES ${LIBC_SOURCES} ${AK_SOURCES} ${ELF_SOURCES})
+
+serenity_libc_static(LibCStatic c)
+target_link_libraries(LibCStatic crt0 ssp)
+add_dependencies(LibCStatic LibM)
+
+set(CMAKE_CXX_FLAGS "${CMAKE_CXX_FLAGS} -static-libstdc++")
+serenity_libc(LibC c)
+target_link_libraries(LibC crt0 ssp)
+add_dependencies(LibC LibM)

Userland/Libraries/LibC/alloca.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#define alloca __builtin_alloca

Userland/Libraries/LibC/arpa/inet.cpp

@@ -0,0 +1,92 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <arpa/inet.h>
+#include <errno.h>
+#include <netinet/in.h>
+#include <stdio.h>
+
+extern "C" {
+
+const char* inet_ntop(int af, const void* src, char* dst, socklen_t len)
+{
+    if (af != AF_INET) {
+        errno = EAFNOSUPPORT;
+        return nullptr;
+    }
+    auto* bytes = (const unsigned char*)src;
+    snprintf(dst, len, "%u.%u.%u.%u", bytes[0], bytes[1], bytes[2], bytes[3]);
+    return (const char*)dst;
+}
+
+int inet_pton(int af, const char* src, void* dst)
+{
+    if (af != AF_INET) {
+        errno = EAFNOSUPPORT;
+        return -1;
+    }
+    unsigned a;
+    unsigned b;
+    unsigned c;
+    unsigned d;
+    int count = sscanf(src, "%u.%u.%u.%u", &a, &b, &c, &d);
+    if (count != 4) {
+        errno = EINVAL;
+        return 0;
+    }
+    union {
+        struct {
+            uint8_t a;
+            uint8_t b;
+            uint8_t c;
+            uint8_t d;
+        };
+        uint32_t l;
+    } u;
+    u.a = a;
+    u.b = b;
+    u.c = c;
+    u.d = d;
+    *(uint32_t*)dst = u.l;
+    return 1;
+}
+
+in_addr_t inet_addr(const char* str)
+{
+    in_addr_t tmp {};
+    int rc = inet_pton(AF_INET, str, &tmp);
+    if (rc < 0)
+        return INADDR_NONE;
+    return tmp;
+}
+
+char* inet_ntoa(struct in_addr in)
+{
+    static char buffer[32];
+    inet_ntop(AF_INET, &in.s_addr, buffer, sizeof(buffer));
+    return buffer;
+}
+}

Userland/Libraries/LibC/arpa/inet.h

@@ -0,0 +1,75 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <endian.h>
+#include <sys/cdefs.h>
+#include <sys/socket.h>
+
+__BEGIN_DECLS
+
+#define INET_ADDRSTRLEN 16
+
+const char* inet_ntop(int af, const void* src, char* dst, socklen_t);
+int inet_pton(int af, const char* src, void* dst);
+
+static inline int inet_aton(const char* cp, struct in_addr* inp)
+{
+    return inet_pton(AF_INET, cp, inp);
+}
+
+char* inet_ntoa(struct in_addr);
+
+inline uint16_t htons(uint16_t value)
+{
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+    return __builtin_bswap16(value);
+#else
+    return value;
+#endif
+}
+
+inline uint16_t ntohs(uint16_t value)
+{
+    return htons(value);
+}
+
+inline uint32_t htonl(uint32_t value)
+{
+#if __BYTE_ORDER == __LITTLE_ENDIAN
+    return __builtin_bswap32(value);
+#else
+    return value;
+#endif
+}
+
+inline uint32_t ntohl(uint32_t value)
+{
+    return htonl(value);
+}
+
+__END_DECLS

Userland/Libraries/LibC/assert.cpp

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/API/Syscall.h>
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/internals.h>
+#include <unistd.h>
+
+extern "C" {
+
+extern bool __stdio_is_initialized;
+#ifdef DEBUG
+void __assertion_failed(const char* msg)
+{
+    dbgprintf("USERSPACE(%d) ASSERTION FAILED: %s\n", getpid(), msg);
+    if (__stdio_is_initialized)
+        fprintf(stderr, "ASSERTION FAILED: %s\n", msg);
+
+    Syscall::SC_set_coredump_metadata_params params {
+        { "assertion", strlen("assertion") },
+        { msg, strlen(msg) },
+    };
+    syscall(SC_set_coredump_metadata, &params);
+    syscall(SC_abort);
+    for (;;) { }
+}
+#endif
+}

Userland/Libraries/LibC/assert.h

@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#ifdef DEBUG
+__attribute__((noreturn)) void __assertion_failed(const char* msg);
+#    define __stringify_helper(x) #    x
+#    define __stringify(x) __stringify_helper(x)
+#    define assert(expr)                                                           \
+        do {                                                                       \
+            if (__builtin_expect(!(expr), 0))                                      \
+                __assertion_failed(#expr "\n" __FILE__ ":" __stringify(__LINE__)); \
+        } while (0)
+#    define ASSERT_NOT_REACHED() assert(false)
+#else
+#    define assert(expr) ((void)(0))
+#    define ASSERT_NOT_REACHED() CRASH()
+#endif
+
+#define CRASH()              \
+    do {                     \
+        asm volatile("ud2"); \
+    } while (0)
+#define ASSERT assert
+#define RELEASE_ASSERT assert
+#define TODO ASSERT_NOT_REACHED
+
+__END_DECLS

Userland/Libraries/LibC/bits/FILE.h

@@ -0,0 +1,38 @@
+/*
+ * Copyright (c) 2018-2020, Jesse Buhagiar <jooster669@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+#define BUFSIZ 1024
+
+__BEGIN_DECLS
+
+typedef struct FILE FILE;
+
+__END_DECLS

Userland/Libraries/LibC/bits/posix1_lim.h

@@ -0,0 +1,65 @@
+/*
+ * Copyright (c) 2020, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#define _POSIX_AIO_LISTIO_MAX 2               /* The number of I/O operations that can be specified in a list I/O call. */
+#define _POSIX_AIO_MAX 1                      /* The number of outstanding asynchronous I/O operations. */
+#define _POSIX_ARG_MAX 4096                   /* Maximum length of argument to the exec functions including environment data. */
+#define _POSIX_CHILD_MAX 25                   /* Maximum number of simultaneous processes per real user ID. */
+#define _POSIX_DELAYTIMER_MAX 32              /* The number of timer expiration overruns. */
+#define _POSIX_HOST_NAME_MAX 255              /* Maximum length of a host name (not including the terminating null) as returned from the gethostname() function. */
+#define _POSIX_LINK_MAX 8                     /* Maximum number of links to a single file. */
+#define _POSIX_LOGIN_NAME_MAX 9               /* The size of the storage required for a login name, in bytes, including the terminating null. */
+#define _POSIX_MAX_CANON 255                  /* Maximum number of bytes in a terminal canonical input queue. */
+#define _POSIX_MAX_INPUT 255                  /* Maximum number of bytes allowed in a terminal input queue. */
+#define _POSIX_MQ_OPEN_MAX 8                  /* The number of message queues that can be open for a single process.) */
+#define _POSIX_MQ_PRIO_MAX 32                 /* The maximum number of message priorities supported by the implementation. */
+#define _POSIX_NAME_MAX 14                    /* Maximum number of bytes in a filename (not including terminating null). */
+#define _POSIX_NGROUPS_MAX 8                  /* Maximum number of simultaneous supplementary group IDs per process. */
+#define _POSIX_OPEN_MAX 20                    /* Maximum number of files that one process can have open at any one time. */
+#define _POSIX_PATH_MAX 256                   /* Maximum number of bytes in a pathname. */
+#define _POSIX_PIPE_BUF 512                   /* Maximum number of bytes that is guaranteed to be atomic when writing to a pipe. */
+#define _POSIX_RE_DUP_MAX 255                 /* The number of repeated occurrences of a BRE permitted by the regexec() and regcomp() functions when using the interval notation #define \(m,n\}; see BREs Matching Multiple Characters. */
+#define _POSIX_RTSIG_MAX 8                    /* The number of realtime signal numbers reserved for application use. */
+#define _POSIX_SEM_NSEMS_MAX 256              /* The number of semaphores that a process may have. */
+#define _POSIX_SEM_VALUE_MAX 32767            /* The maximum value a semaphore may have. */
+#define _POSIX_SIGQUEUE_MAX 32                /* The number of queued signals that a process may send and have pending at the receiver(s) at any time. */
+#define _POSIX_SSIZE_MAX 32767                /* The value that can be stored in an object of type ssize_t. */
+#define _POSIX_SS_REPL_MAX 4                  /* The number of replenishment operations that may be simultaneously pending for a particular sporadic server scheduler. */
+#define _POSIX_STREAM_MAX 8                   /* The number of streams that one process can have open at one time. */
+#define _POSIX_SYMLINK_MAX 255                /* The number of bytes in a symbolic link. */
+#define _POSIX_SYMLOOP_MAX 8                  /* The number of symbolic links that can be traversed in the resolution of a pathname in the absence of a loop. */
+#define _POSIX_THREAD_DESTRUCTOR_ITERATIONS 4 /* The number of attempts made to destroy a thread's thread-specific data values on thread exit. */
+#define _POSIX_THREAD_KEYS_MAX 128            /* The number of data keys per process. */
+#define _POSIX_THREAD_THREADS_MAX 64          /* The number of threads per process. */
+#define _POSIX_TIMER_MAX 32                   /* The per-process number of timers. */
+#define _POSIX_TRACE_EVENT_NAME_MAX 30        /* The length in bytes of a trace event name. */
+#define _POSIX_TRACE_NAME_MAX 8               /* The length in bytes of a trace generation version string or a trace stream name. */
+#define _POSIX_TRACE_SYS_MAX 8                /* The number of trace streams that may simultaneously exist in the system. */
+#define _POSIX_TRACE_USER_EVENT_MAX 32        /* The number of user trace event type identifiers that may simultaneously exist in a traced process, including the predefined user trace event POSIX_TRACE_UNNAMED_USER_EVENT. */
+#define _POSIX_TTY_NAME_MAX 9                 /* The size of the storage required for a terminal device name, in bytes, including the terminating null. */
+#define _POSIX_TZNAME_MAX 6                   /* Maximum number of bytes supported for the name of a timezone (not of the TZ variable). */

Userland/Libraries/LibC/bits/stdint.h

@@ -0,0 +1,144 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+typedef __UINT64_TYPE__ uint64_t;
+typedef __UINT32_TYPE__ uint32_t;
+typedef __UINT16_TYPE__ uint16_t;
+typedef __UINT8_TYPE__ uint8_t;
+
+typedef __INT64_TYPE__ int64_t;
+typedef __INT32_TYPE__ int32_t;
+typedef __INT16_TYPE__ int16_t;
+typedef __INT8_TYPE__ int8_t;
+
+typedef __UINT_FAST8_TYPE__ uint_fast8_t;
+typedef __UINT_FAST16_TYPE__ uint_fast16_t;
+typedef __UINT_FAST32_TYPE__ uint_fast32_t;
+typedef __UINT_FAST64_TYPE__ uint_fast64_t;
+
+typedef __INT_FAST8_TYPE__ int_fast8_t;
+typedef __INT_FAST16_TYPE__ int_fast16_t;
+typedef __INT_FAST32_TYPE__ int_fast32_t;
+typedef __INT_FAST64_TYPE__ int_fast64_t;
+
+typedef __UINT_LEAST8_TYPE__ uint_least8_t;
+typedef __UINT_LEAST16_TYPE__ uint_least16_t;
+typedef __UINT_LEAST32_TYPE__ uint_least32_t;
+typedef __UINT_LEAST64_TYPE__ uint_least64_t;
+
+typedef __INT_LEAST8_TYPE__ int_least8_t;
+typedef __INT_LEAST16_TYPE__ int_least16_t;
+typedef __INT_LEAST32_TYPE__ int_least32_t;
+typedef __INT_LEAST64_TYPE__ int_least64_t;
+
+#define __int8_t_defined 1
+#define __uint8_t_defined 1
+#define __int16_t_defined 1
+#define __uint16_t_defined 1
+#define __int32_t_defined 1
+#define __uint32_t_defined 1
+#define __int64_t_defined 1
+#define __uint64_t_defined 1
+
+typedef __UINTPTR_TYPE__ uintptr_t;
+typedef __INTPTR_TYPE__ intptr_t;
+
+typedef __UINTMAX_TYPE__ uintmax_t;
+#define UINTMAX_MAX __UINTMAX_MAX__
+#define UINTMAX_MIN __UINTMAX_MIN__
+
+typedef __INTMAX_TYPE__ intmax_t;
+#define INTMAX_MAX __INTMAX_MAX__
+#define INTMAX_MIN (-INTMAX_MAX - 1)
+
+#define INT8_MIN (-128)
+#define INT16_MIN (-32767 - 1)
+#define INT32_MIN (-2147483647 - 1)
+#define INT64_MIN (-9223372036854775807LL - 1LL)
+#define INT8_MAX (127)
+#define INT16_MAX (32767)
+#define INT32_MAX (2147483647)
+#define INT64_MAX (9223372036854775807LL)
+#define UINT8_MAX (255)
+#define UINT16_MAX (65535)
+#define UINT32_MAX (4294967295U)
+#define UINT64_MAX (18446744073709551615ULL)
+
+#define INTPTR_MAX INT32_MAX
+#define INTPTR_MIN INT32_MIN
+#define UINTPTR_MAX UINT32_MAX
+
+#define INT_FAST8_MIN INT8_MIN
+#define INT_FAST16_MIN INT16_MIN
+#define INT_FAST32_MIN INT32_MIN
+#define INT_FAST64_MIN INT64_MIN
+
+#define INT_FAST8_MAX INT8_MAX
+#define INT_FAST16_MAX INT16_MAX
+#define INT_FAST32_MAX INT32_MAX
+#define INT_FAST64_MAX INT64_MAX
+
+#define UINT_FAST8_MAX UINT8_MAX
+#define UINT_FAST16_MAX UINT16_MAX
+#define UINT_FAST32_MAX UINT32_MAX
+#define UINT_FAST64_MAX UINT64_MAX
+
+#define INT_LEAST8_MIN INT8_MIN
+#define INT_LEAST16_MIN INT16_MIN
+#define INT_LEAST32_MIN INT32_MIN
+#define INT_LEAST64_MIN INT64_MIN
+
+#define INT_LEAST8_MAX INT8_MAX
+#define INT_LEAST16_MAX INT16_MAX
+#define INT_LEAST32_MAX INT32_MAX
+#define INT_LEAST64_MAX INT64_MAX
+
+#define UINT_LEAST8_MAX UINT8_MAX
+#define UINT_LEAST16_MAX UINT16_MAX
+#define UINT_LEAST32_MAX UINT32_MAX
+#define UINT_LEAST64_MAX UINT64_MAX
+
+#define INT8_C(x) x
+#define UINT8_C(x) x
+
+#define INT16_C(x) x
+#define UINT16_C(x) x
+
+#define INT32_C(x) x
+#define UINT32_C(x) x
+
+#define INT64_C(x) x##LL
+#define UINT64_C(x) x##ULL
+
+#define SIZE_MAX ((size_t)-1)
+
+__END_DECLS

Userland/Libraries/LibC/byteswap.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2020, the SerenityOS developers
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/cdefs.h>
+
+#pragma once
+
+__BEGIN_DECLS
+
+#define bswap_16(x) (__builtin_bswap16(x))
+#define bswap_32(x) (__builtin_bswap32(x))
+#define bswap_64(x) (__builtin_bswap64(x))
+
+__END_DECLS

Userland/Libraries/LibC/crt0.cpp

@@ -0,0 +1,76 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/Types.h>
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/internals.h>
+#include <unistd.h>
+
+extern "C" {
+
+extern u32 __stack_chk_guard;
+
+int main(int, char**, char**);
+
+// Tell the compiler that this may be called from somewhere else.
+int _start(int argc, char** argv, char** env);
+
+int _start(int argc, char** argv, char** env)
+{
+    u32 original_stack_chk = __stack_chk_guard;
+    arc4random_buf(&__stack_chk_guard, sizeof(__stack_chk_guard));
+
+    if (__stack_chk_guard == 0)
+        __stack_chk_guard = original_stack_chk;
+
+    environ = env;
+    __environ_is_malloced = false;
+
+    __libc_init();
+
+    _init();
+
+    extern void (*__init_array_start[])(int, char**, char**) __attribute__((visibility("hidden")));
+    extern void (*__init_array_end[])(int, char**, char**) __attribute__((visibility("hidden")));
+
+    const size_t size = __init_array_end - __init_array_start;
+    for (size_t i = 0; i < size; i++)
+        (*__init_array_start[i])(argc, argv, env);
+
+    int status = main(argc, argv, environ);
+
+    exit(status);
+
+    // We should never get here, but if we ever do, make sure to
+    // restore the stack guard to the value we entered _start with.
+    // Then we won't trigger the stack canary check on the way out.
+    __stack_chk_guard = original_stack_chk;
+
+    return 20150614;
+}
+}

Userland/Libraries/LibC/crt0_shared.cpp

@@ -0,0 +1,66 @@
+/*
+ * Copyright (c) 2020, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/Types.h>
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/internals.h>
+#include <unistd.h>
+
+extern "C" {
+
+extern u32 __stack_chk_guard;
+
+int main(int, char**, char**);
+
+extern void __libc_init();
+extern void _init();
+extern char** environ;
+extern bool __environ_is_malloced;
+
+int _start(int argc, char** argv, char** env);
+int _start(int argc, char** argv, char** env)
+{
+    u32 original_stack_chk = __stack_chk_guard;
+    arc4random_buf(&__stack_chk_guard, sizeof(__stack_chk_guard));
+
+    if (__stack_chk_guard == 0)
+        __stack_chk_guard = original_stack_chk;
+
+    _init();
+
+    int status = main(argc, argv, env);
+
+    // Restore the stack guard to the value we entered _start with,
+    // so we don't trigger the stack canary check on the way out.
+    __stack_chk_guard = original_stack_chk;
+
+    return status;
+}
+}
+
+void* __dso_handle __attribute__((__weak__));

Userland/Libraries/LibC/crti.S

@@ -0,0 +1,35 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+.global _init
+.section .init
+_init:
+    push %ebp
+
+.global _fini
+.section .fini
+_fini:
+    push %ebp

Userland/Libraries/LibC/crtn.S

@@ -0,0 +1,33 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+.section .init
+    pop %ebp
+    ret
+
+.section .fini
+    pop %ebp
+    ret

Userland/Libraries/LibC/ctype.cpp

@@ -0,0 +1,63 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <ctype.h>
+
+extern "C" {
+
+const char _ctype_[256] = {
+    _C, _C, _C, _C, _C, _C, _C, _C,
+    _C, _C | _S, _C | _S, _C | _S, _C | _S, _C | _S, _C, _C,
+    _C, _C, _C, _C, _C, _C, _C, _C,
+    _C, _C, _C, _C, _C, _C, _C, _C,
+    (char)(_S | _B), _P, _P, _P, _P, _P, _P, _P,
+    _P, _P, _P, _P, _P, _P, _P, _P,
+    _N, _N, _N, _N, _N, _N, _N, _N,
+    _N, _N, _P, _P, _P, _P, _P, _P,
+    _P, _U | _X, _U | _X, _U | _X, _U | _X, _U | _X, _U | _X, _U,
+    _U, _U, _U, _U, _U, _U, _U, _U,
+    _U, _U, _U, _U, _U, _U, _U, _U,
+    _U, _U, _U, _P, _P, _P, _P, _P,
+    _P, _L | _X, _L | _X, _L | _X, _L | _X, _L | _X, _L | _X, _L,
+    _L, _L, _L, _L, _L, _L, _L, _L,
+    _L, _L, _L, _L, _L, _L, _L, _L,
+    _L, _L, _L, _P, _P, _P, _P, _C
+};
+
+int tolower(int c)
+{
+    if (c >= 'A' && c <= 'Z')
+        return c | 0x20;
+    return c;
+}
+
+int toupper(int c)
+{
+    if (c >= 'a' && c <= 'z')
+        return c & ~0x20;
+    return c;
+}
+}

Userland/Libraries/LibC/ctype.h

@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+/* Do what newlib does to appease GCC's --with-newlib option. */
+#define _U 01
+#define _L 02
+#define _N 04
+#define _S 010
+#define _P 020
+#define _C 040
+#define _X 0100
+#define _B 0200
+
+extern const char _ctype_[256];
+
+int tolower(int);
+int toupper(int);
+
+static inline int isalnum(int c)
+{
+    return (_ctype_[(unsigned char)(c)] & (_U | _L | _N));
+}
+
+static inline int isalpha(int c)
+{
+    return (_ctype_[(unsigned char)(c)] & (_U | _L));
+}
+
+static inline int iscntrl(int c)
+{
+    return (_ctype_[(unsigned char)(c)] & (_C));
+}
+
+static inline int isdigit(int c)
+{
+    return (_ctype_[(unsigned char)(c)] & (_N));
+}
+
+static inline int isxdigit(int c)
+{
+    return (_ctype_[(unsigned char)(c)] & (_N | _X));
+}
+
+static inline int isspace(int c)
+{
+    return (_ctype_[(unsigned char)(c)] & (_S));
+}
+
+static inline int ispunct(int c)
+{
+    return (_ctype_[(unsigned char)(c)] & (_P));
+}
+
+static inline int isprint(int c)
+{
+    return (_ctype_[(unsigned char)(c)] & (_P | _U | _L | _N | _B));
+}
+
+static inline int isgraph(int c)
+{
+    return (_ctype_[(unsigned char)(c)] & (_P | _U | _L | _N));
+}
+
+static inline int islower(int c)
+{
+    return ((_ctype_[(unsigned char)(c)] & (_U | _L)) == _L);
+}
+
+static inline int isupper(int c)
+{
+    return ((_ctype_[(unsigned char)(c)] & (_U | _L)) == _U);
+}
+
+#define isascii(c) ((unsigned)c <= 127)
+#define toascii(c) ((c)&127)
+
+__END_DECLS

Userland/Libraries/LibC/cxxabi.cpp

@@ -0,0 +1,89 @@
+/*
+ * Copyright (c) 2019-2020, Andrew Kaster <andrewdkaster@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <assert.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/internals.h>
+
+//#define GLOBAL_DTORS_DEBUG
+
+extern "C" {
+
+struct __exit_entry {
+    AtExitFunction method;
+    void* parameter;
+    void* dso_handle;
+    bool has_been_called;
+};
+
+static __exit_entry __exit_entries[1024] {};
+static int __exit_entry_count = 0;
+
+int __cxa_atexit(AtExitFunction exit_function, void* parameter, void* dso_handle)
+{
+    if (__exit_entry_count >= 1024)
+        return -1;
+
+    __exit_entries[__exit_entry_count++] = { exit_function, parameter, dso_handle, false };
+
+    return 0;
+}
+
+void __cxa_finalize(void* dso_handle)
+{
+    // From the itanium abi, https://itanium-cxx-abi.github.io/cxx-abi/abi.html#dso-dtor-runtime-api
+    //
+    // When __cxa_finalize(d) is called, it should walk the termination function list, calling each in turn
+    // if d matches __dso_handle for the termination function entry. If d == NULL, it should call all of them.
+    // Multiple calls to __cxa_finalize shall not result in calling termination function entries multiple times;
+    // the implementation may either remove entries or mark them finished.
+
+    int entry_index = __exit_entry_count;
+
+#ifdef GLOBAL_DTORS_DEBUG
+    dbgprintf("__cxa_finalize: %d entries in the finalizer list\n", entry_index);
+#endif
+
+    while (--entry_index >= 0) {
+        auto& exit_entry = __exit_entries[entry_index];
+        bool needs_calling = !exit_entry.has_been_called && (!dso_handle || dso_handle == exit_entry.dso_handle);
+        if (needs_calling) {
+#ifdef GLOBAL_DTORS_DEBUG
+            dbgprintf("__cxa_finalize: calling entry[%d] %p(%p) dso: %p\n", entry_index, exit_entry.method, exit_entry.parameter, exit_entry.dso_handle);
+#endif
+            exit_entry.method(exit_entry.parameter);
+            exit_entry.has_been_called = true;
+        }
+    }
+}
+
+[[noreturn]] void __cxa_pure_virtual()
+{
+    ASSERT_NOT_REACHED();
+}
+
+} // extern "C"

Userland/Libraries/LibC/dirent.cpp

@@ -0,0 +1,200 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/Assertions.h>
+#include <AK/StdLibExtras.h>
+#include <Kernel/API/Syscall.h>
+#include <dirent.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+extern "C" {
+
+DIR* opendir(const char* name)
+{
+    int fd = open(name, O_RDONLY | O_DIRECTORY);
+    if (fd == -1)
+        return nullptr;
+    DIR* dirp = (DIR*)malloc(sizeof(DIR));
+    dirp->fd = fd;
+    dirp->buffer = nullptr;
+    dirp->buffer_size = 0;
+    dirp->nextptr = nullptr;
+    return dirp;
+}
+
+int closedir(DIR* dirp)
+{
+    if (!dirp || dirp->fd == -1)
+        return -EBADF;
+    if (dirp->buffer)
+        free(dirp->buffer);
+    int rc = close(dirp->fd);
+    if (rc == 0)
+        dirp->fd = -1;
+    free(dirp);
+    return rc;
+}
+
+struct [[gnu::packed]] sys_dirent {
+    ino_t ino;
+    u8 file_type;
+    size_t namelen;
+    char name[];
+    size_t total_size()
+    {
+        return sizeof(ino_t) + sizeof(u8) + sizeof(size_t) + sizeof(char) * namelen;
+    }
+};
+
+static void create_struct_dirent(sys_dirent* sys_ent, struct dirent* str_ent)
+{
+    str_ent->d_ino = sys_ent->ino;
+    str_ent->d_type = sys_ent->file_type;
+    str_ent->d_off = 0;
+    str_ent->d_reclen = sys_ent->total_size();
+    for (size_t i = 0; i < sys_ent->namelen; ++i)
+        str_ent->d_name[i] = sys_ent->name[i];
+    // FIXME: I think this null termination behavior is not supposed to be here.
+    str_ent->d_name[sys_ent->namelen] = '\0';
+}
+
+static int allocate_dirp_buffer(DIR* dirp)
+{
+    if (dirp->buffer) {
+        return 0;
+    }
+
+    struct stat st;
+    // preserve errno since this could be a reentrant call
+    int old_errno = errno;
+    int rc = fstat(dirp->fd, &st);
+    if (rc < 0) {
+        int new_errno = errno;
+        errno = old_errno;
+        return new_errno;
+    }
+    size_t size_to_allocate = max(st.st_size, static_cast<off_t>(4096));
+    dirp->buffer = (char*)malloc(size_to_allocate);
+    ssize_t nread = syscall(SC_get_dir_entries, dirp->fd, dirp->buffer, size_to_allocate);
+    if (nread < 0) {
+        // uh-oh, the syscall returned an error
+        free(dirp->buffer);
+        dirp->buffer = nullptr;
+        return -nread;
+    }
+    dirp->buffer_size = nread;
+    dirp->nextptr = dirp->buffer;
+    return 0;
+}
+
+dirent* readdir(DIR* dirp)
+{
+    if (!dirp)
+        return nullptr;
+    if (dirp->fd == -1)
+        return nullptr;
+
+    if (int new_errno = allocate_dirp_buffer(dirp)) {
+        // readdir is allowed to mutate errno
+        errno = new_errno;
+        return nullptr;
+    }
+
+    if (dirp->nextptr >= (dirp->buffer + dirp->buffer_size))
+        return nullptr;
+
+    auto* sys_ent = (sys_dirent*)dirp->nextptr;
+    create_struct_dirent(sys_ent, &dirp->cur_ent);
+
+    dirp->nextptr += sys_ent->total_size();
+    return &dirp->cur_ent;
+}
+
+static bool compare_sys_struct_dirent(sys_dirent* sys_ent, struct dirent* str_ent)
+{
+    size_t namelen = min((size_t)256, sys_ent->namelen);
+    // These fields are guaranteed by create_struct_dirent to be the same
+    return sys_ent->ino == str_ent->d_ino
+        && sys_ent->file_type == str_ent->d_type
+        && sys_ent->total_size() == str_ent->d_reclen
+        && strncmp(sys_ent->name, str_ent->d_name, namelen) == 0;
+}
+
+int readdir_r(DIR* dirp, struct dirent* entry, struct dirent** result)
+{
+    if (!dirp || dirp->fd == -1) {
+        *result = nullptr;
+        return EBADF;
+    }
+
+    if (int new_errno = allocate_dirp_buffer(dirp)) {
+        *result = nullptr;
+        return new_errno;
+    }
+
+    // This doesn't care about dirp state; seek until we find the entry.
+    // Unfortunately, we can't just compare struct dirent to sys_dirent, so
+    // manually compare the fields. This seems a bit risky, but could work.
+    auto* buffer = dirp->buffer;
+    auto* sys_ent = (sys_dirent*)buffer;
+    bool found = false;
+    while (!(found || buffer >= dirp->buffer + dirp->buffer_size)) {
+        found = compare_sys_struct_dirent(sys_ent, entry);
+
+        // Make sure if we found one, it's the one after (end of buffer or not)
+        buffer += sys_ent->total_size();
+        sys_ent = (sys_dirent*)buffer;
+    }
+
+    // If we found one, but hit end of buffer, then EOD
+    if (found && buffer >= dirp->buffer + dirp->buffer_size) {
+        *result = nullptr;
+        return 0;
+    }
+    // If we never found a match for entry in buffer, start from the beginning
+    else if (!found) {
+        buffer = dirp->buffer;
+        sys_ent = (sys_dirent*)buffer;
+    }
+
+    *result = entry;
+    create_struct_dirent(sys_ent, entry);
+
+    return 0;
+}
+
+int dirfd(DIR* dirp)
+{
+    ASSERT(dirp);
+    return dirp->fd;
+}
+}

Userland/Libraries/LibC/dirent.h

@@ -0,0 +1,77 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+enum {
+    DT_UNKNOWN = 0,
+#define DT_UNKNOWN DT_UNKNOWN
+    DT_FIFO = 1,
+#define DT_FIFO DT_FIFO
+    DT_CHR = 2,
+#define DT_CHR DT_CHR
+    DT_DIR = 4,
+#define DT_DIR DT_DIR
+    DT_BLK = 6,
+#define DT_BLK DT_BLK
+    DT_REG = 8,
+#define DT_REG DT_REG
+    DT_LNK = 10,
+#define DT_LNK DT_LNK
+    DT_SOCK = 12,
+#define DT_SOCK DT_SOCK
+    DT_WHT = 14
+#define DT_WHT DT_WHT
+};
+
+struct dirent {
+    ino_t d_ino;
+    off_t d_off;
+    unsigned short d_reclen;
+    unsigned char d_type;
+    char d_name[256];
+};
+
+struct __DIR {
+    int fd;
+    struct dirent cur_ent;
+    char* buffer;
+    size_t buffer_size;
+    char* nextptr;
+};
+typedef struct __DIR DIR;
+
+DIR* opendir(const char* name);
+int closedir(DIR*);
+struct dirent* readdir(DIR*);
+int readdir_r(DIR*, struct dirent*, struct dirent**);
+int dirfd(DIR*);
+
+__END_DECLS

Userland/Libraries/LibC/dlfcn.cpp

@@ -0,0 +1,131 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <assert.h>
+#include <dlfcn.h>
+#include <fcntl.h>
+#include <mman.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+
+#include <AK/HashMap.h>
+#include <AK/LexicalPath.h>
+#include <AK/RefPtr.h>
+#include <AK/ScopeGuard.h>
+#include <AK/String.h>
+#include <AK/StringBuilder.h>
+#include <LibELF/DynamicLoader.h>
+
+// NOTE: The string here should never include a trailing newline (according to POSIX)
+String g_dlerror_msg;
+
+HashMap<String, RefPtr<ELF::DynamicLoader>> g_elf_objects;
+
+extern "C" {
+
+int dlclose(void*)
+{
+    g_dlerror_msg = "dlclose not implemented!";
+    return -1;
+}
+
+char* dlerror()
+{
+    return const_cast<char*>(g_dlerror_msg.characters());
+}
+
+void* dlopen(const char* filename, int flags)
+{
+    // FIXME: Create a global mutex/semaphore/lock for dlopen/dlclose/dlsym and (?) dlerror
+    // FIXME: refcount?
+
+    if (!filename) {
+        // FIXME: Return the handle for "the main executable"
+        //     The Serenity Kernel will keep a mapping of the main elf binary resident in memory,
+        //     But a future dynamic loader might have a different idea/way of letting us access this information
+        ASSERT_NOT_REACHED();
+    }
+
+    auto basename = LexicalPath(filename).basename();
+
+    auto existing_elf_object = g_elf_objects.get(basename);
+    if (existing_elf_object.has_value()) {
+        return const_cast<ELF::DynamicLoader*>(existing_elf_object.value());
+    }
+
+    int fd = open(filename, O_RDONLY);
+    if (!fd) {
+        g_dlerror_msg = String::format("Unable to open file %s", filename);
+        return nullptr;
+    }
+
+    ScopeGuard close_fd_guard([fd]() { close(fd); });
+
+    struct stat file_stats {
+    };
+
+    int ret = fstat(fd, &file_stats);
+    if (ret < 0) {
+        g_dlerror_msg = String::format("Unable to stat file %s", filename);
+        return nullptr;
+    }
+
+    auto loader = ELF::DynamicLoader::construct(filename, fd, file_stats.st_size);
+
+    if (!loader->is_valid()) {
+        g_dlerror_msg = String::format("%s is not a valid ELF dynamic shared object!", filename);
+        return nullptr;
+    }
+
+    if (!loader->load_from_image(flags,
+            0 // total_tls_size = 0, FIXME: Support TLS when using dlopen()
+            )) {
+        g_dlerror_msg = String::format("Failed to load ELF object %s", filename);
+        return nullptr;
+    }
+
+    g_elf_objects.set(basename, move(loader));
+    g_dlerror_msg = "Successfully loaded ELF object.";
+
+    // we have one refcount already
+    return const_cast<ELF::DynamicLoader*>(g_elf_objects.get(basename).value());
+}
+
+void* dlsym(void* handle, const char* symbol_name)
+{
+    // FIXME: When called with a NULL handle we're supposed to search every dso in the process... that'll get expensive
+    ASSERT(handle);
+    auto* dso = reinterpret_cast<ELF::DynamicLoader*>(handle);
+    void* symbol = dso->symbol_for_name(symbol_name);
+    if (!symbol) {
+        g_dlerror_msg = "Symbol not found";
+        return nullptr;
+    }
+    return symbol;
+}
+
+} // extern "C"

Userland/Libraries/LibC/dlfcn.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#define RTLD_DEFAULT 0
+#define RTLD_LAZY 2
+#define RTLD_NOW 4
+#define RTLD_GLOBAL 8
+#define RTLD_LOCAL 16
+
+int dlclose(void*);
+char* dlerror();
+void* dlopen(const char*, int);
+void* dlsym(void*, const char*);
+
+__END_DECLS

Userland/Libraries/LibC/endian.h

@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#define __LITTLE_ENDIAN 1234
+#define __BIG_ENDIAN 4321
+#define __PDP_ENDIAN 3412
+
+#if defined(__GNUC__) && defined(__BYTE_ORDER__)
+#    define __BYTE_ORDER __BYTE_ORDER__
+#else
+#    include <bits/endian.h>
+#endif
+
+#if defined(_GNU_SOURCE) || defined(_BSD_SOURCE)
+
+#    include <stdint.h>
+
+static __inline uint16_t __bswap16(uint16_t x)
+{
+    return __builtin_bswap16(x);
+}
+
+static __inline uint32_t __bswap32(uint32_t x)
+{
+    return __builtin_bswap32(x);
+}
+
+static __inline uint64_t __bswap64(uint64_t x)
+{
+    return __builtin_bswap64(x);
+}
+
+#    define LITTLE_ENDIAN __LITTLE_ENDIAN
+#    define BIG_ENDIAN __BIG_ENDIAN
+#    define PDP_ENDIAN __PDP_ENDIAN
+#    define BYTE_ORDER __BYTE_ORDER
+
+#    if __BYTE_ORDER == __LITTLE_ENDIAN
+#        define htole16(x) ((uint16_t)(x))
+#        define le16toh(x) ((uint16_t)(x))
+#        define letoh16(x) ((uint16_t)(x))
+#        define htole32(x) ((uint32_t)(x))
+#        define le32toh(x) ((uint32_t)(x))
+#        define letoh32(x) ((uint32_t)(x))
+#        define htole64(x) ((uint64_t)(x))
+#        define le64toh(x) ((uint64_t)(x))
+#        define letoh64(x) ((uint64_t)(x))
+#        define htobe16(x) (__builtin_bswap16(x))
+#        define be16toh(x) (__builtin_bswap16(x))
+#        define betoh16(x) (__builtin_bswap16(x))
+#        define htobe32(x) (__builtin_bswap32(x))
+#        define be32toh(x) (__builtin_bswap32(x))
+#        define betoh32(x) (__builtin_bswap32(x))
+#        define htobe64(x) (__builtin_bswap64(x))
+#        define be64toh(x) (__builtin_bswap64(x))
+#        define betoh64(x) (__builtin_bswap64(x))
+#    else
+#        define htole16(x) (__builtin_bswap16(x))
+#        define le16toh(x) (__builtin_bswap16(x))
+#        define letoh16(x) (__builtin_bswap16(x))
+#        define htole32(x) (__builtin_bswap32(x))
+#        define le32toh(x) (__builtin_bswap32(x))
+#        define letoh32(x) (__builtin_bswap32(x))
+#        define htole64(x) (__builtin_bswap64(x))
+#        define le64toh(x) (__builtin_bswap64(x))
+#        define letoh64(x) (__builtin_bswap64(x))
+#        define htobe16(x) ((uint16_t)(x))
+#        define be16toh(x) ((uint16_t)(x))
+#        define betoh16(x) ((uint16_t)(x))
+#        define htobe32(x) ((uint32_t)(x))
+#        define be32toh(x) ((uint32_t)(x))
+#        define betoh32(x) ((uint32_t)(x))
+#        define htobe64(x) ((uint64_t)(x))
+#        define be64toh(x) ((uint64_t)(x))
+#        define betoh64(x) ((uint64_t)(x))
+#    endif
+
+#endif
+
+__END_DECLS

Userland/Libraries/LibC/errno.h

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <errno_numbers.h>
+#include <sys/cdefs.h>
+
+#define __RETURN_WITH_ERRNO(rc, good_ret, bad_ret) \
+    do {                                           \
+        if (rc < 0) {                              \
+            errno = -rc;                           \
+            return (bad_ret);                      \
+        }                                          \
+        errno = 0;                                 \
+        return (good_ret);                         \
+    } while (0)
+
+__BEGIN_DECLS
+
+extern const char* const sys_errlist[];
+extern int sys_nerr;
+
+#ifdef NO_TLS
+extern int errno;
+#else
+extern __thread int errno;
+#endif
+
+#define errno errno
+
+__END_DECLS

Userland/Libraries/LibC/errno_numbers.h

@@ -0,0 +1,103 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#define EPERM 1
+#define ENOENT 2
+#define ESRCH 3
+#define EINTR 4
+#define EIO 5
+#define ENXIO 6
+#define E2BIG 7
+#define ENOEXEC 8
+#define EBADF 9
+#define ECHILD 10
+#define EAGAIN 11
+#define ENOMEM 12
+#define EACCES 13
+#define EFAULT 14
+#define ENOTBLK 15
+#define EBUSY 16
+#define EEXIST 17
+#define EXDEV 18
+#define ENODEV 19
+#define ENOTDIR 20
+#define EISDIR 21
+#define EINVAL 22
+#define ENFILE 23
+#define EMFILE 24
+#define ENOTTY 25
+#define ETXTBSY 26
+#define EFBIG 27
+#define ENOSPC 28
+#define ESPIPE 29
+#define EROFS 30
+#define EMLINK 31
+#define EPIPE 32
+#define ERANGE 33
+#define ENAMETOOLONG 34
+#define ELOOP 35
+#define EOVERFLOW 36
+#define EOPNOTSUPP 37
+#define ENOSYS 38
+#define ENOTIMPL 39
+#define EAFNOSUPPORT 40
+#define ENOTSOCK 41
+#define EADDRINUSE 42
+#define EWHYTHO 43
+#define ENOTEMPTY 44
+#define EDOM 45
+#define ECONNREFUSED 46
+#define EADDRNOTAVAIL 47
+#define EISCONN 48
+#define ECONNABORTED 49
+#define EALREADY 50
+#define ECONNRESET 51
+#define EDESTADDRREQ 52
+#define EHOSTUNREACH 53
+#define EILSEQ 54
+#define EMSGSIZE 55
+#define ENETDOWN 56
+#define ENETUNREACH 57
+#define ENETRESET 58
+#define ENOBUFS 59
+#define ENOLCK 60
+#define ENOMSG 61
+#define ENOPROTOOPT 62
+#define ENOTCONN 63
+#define EWOULDBLOCK 64
+#define EPROTONOSUPPORT 65
+#define EDEADLK 66
+#define ETIMEDOUT 67
+#define EPROTOTYPE 68
+#define EINPROGRESS 69
+#define ENOTHREAD 70
+#define EPROTO 71
+#define ENOTSUP 72
+#define EPFNOSUPPORT 73
+#define EDIRINTOSELF 74
+#define EMAXERRNO 75

Userland/Libraries/LibC/fcntl.cpp

@@ -0,0 +1,106 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/API/Syscall.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <stdarg.h>
+#include <string.h>
+
+extern "C" {
+
+int fcntl(int fd, int cmd, ...)
+{
+    va_list ap;
+    va_start(ap, cmd);
+    u32 extra_arg = va_arg(ap, u32);
+    int rc = syscall(SC_fcntl, fd, cmd, extra_arg);
+    va_end(ap);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int watch_file(const char* path, size_t path_length)
+{
+    int rc = syscall(SC_watch_file, path, path_length);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int creat(const char* path, mode_t mode)
+{
+    return open(path, O_CREAT | O_WRONLY | O_TRUNC, mode);
+}
+
+int creat_with_path_length(const char* path, size_t path_length, mode_t mode)
+{
+    return open_with_path_length(path, path_length, O_CREAT | O_WRONLY | O_TRUNC, mode);
+}
+
+int open_with_path_length(const char* path, size_t path_length, int options, mode_t mode)
+{
+    return openat_with_path_length(AT_FDCWD, path, path_length, options, mode);
+}
+
+int openat_with_path_length(int dirfd, const char* path, size_t path_length, int options, mode_t mode)
+{
+    if (!path) {
+        errno = EFAULT;
+        return -1;
+    }
+    if (path_length > INT32_MAX) {
+        errno = EINVAL;
+        return -1;
+    }
+    Syscall::SC_open_params params { dirfd, { path, path_length }, options, mode };
+    int rc = syscall(SC_open, &params);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int open(const char* path, int options, ...)
+{
+    if (!path) {
+        errno = EFAULT;
+        return -1;
+    }
+    va_list ap;
+    va_start(ap, options);
+    auto mode = (mode_t)va_arg(ap, unsigned);
+    va_end(ap);
+    return open_with_path_length(path, strlen(path), options, mode);
+}
+
+int openat(int dirfd, const char* path, int options, ...)
+{
+    if (!path) {
+        errno = EFAULT;
+        return -1;
+    }
+    va_list ap;
+    va_start(ap, options);
+    auto mode = (mode_t)va_arg(ap, unsigned);
+    va_end(ap);
+    return openat_with_path_length(dirfd, path, strlen(path), options, mode);
+}
+}

Userland/Libraries/LibC/fcntl.h

@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+#define F_DUPFD 0
+#define F_GETFD 1
+#define F_SETFD 2
+#define F_GETFL 3
+#define F_SETFL 4
+#define F_ISTTY 5
+
+#define FD_CLOEXEC 1
+
+#define O_RDONLY (1 << 0)
+#define O_WRONLY (1 << 1)
+#define O_RDWR (O_RDONLY | O_WRONLY)
+#define O_ACCMODE (O_RDONLY | O_WRONLY)
+#define O_EXEC (1 << 2)
+#define O_CREAT (1 << 3)
+#define O_EXCL (1 << 4)
+#define O_NOCTTY (1 << 5)
+#define O_TRUNC (1 << 6)
+#define O_APPEND (1 << 7)
+#define O_NONBLOCK (1 << 8)
+#define O_DIRECTORY (1 << 9)
+#define O_NOFOLLOW (1 << 10)
+#define O_CLOEXEC (1 << 11)
+#define O_DIRECT (1 << 12)
+
+#define S_IFMT 0170000
+#define S_IFDIR 0040000
+#define S_IFCHR 0020000
+#define S_IFBLK 0060000
+#define S_IFREG 0100000
+#define S_IFIFO 0010000
+#define S_IFLNK 0120000
+#define S_IFSOCK 0140000
+
+#define S_ISUID 04000
+#define S_ISGID 02000
+#define S_ISVTX 01000
+#define S_IRUSR 0400
+#define S_IWUSR 0200
+#define S_IXUSR 0100
+#define S_IRGRP 0040
+#define S_IWGRP 0020
+#define S_IXGRP 0010
+#define S_IROTH 0004
+#define S_IWOTH 0002
+#define S_IXOTH 0001
+
+#define S_IRWXU (S_IRUSR | S_IWUSR | S_IXUSR)
+
+#define S_IRWXG (S_IRWXU >> 3)
+#define S_IRWXO (S_IRWXG >> 3)
+
+int creat(const char* path, mode_t);
+int open(const char* path, int options, ...);
+int creat_with_path_length(const char* path, size_t path_length, mode_t);
+int open_with_path_length(const char* path, size_t path_length, int options, mode_t);
+#define AT_FDCWD -100
+int openat(int dirfd, const char* path, int options, ...);
+int openat_with_path_length(int dirfd, const char* path, size_t path_length, int options, mode_t);
+
+int fcntl(int fd, int cmd, ...);
+int watch_file(const char* path, size_t path_length);
+
+#define F_RDLCK 0
+#define F_WRLCK 1
+#define F_UNLCK 2
+#define F_SETLK 6
+#define F_SETLKW 7
+
+struct flock {
+    short l_type;
+    short l_whence;
+    off_t l_start;
+    off_t l_len;
+    pid_t l_pid;
+};
+
+__END_DECLS

Userland/Libraries/LibC/fd_set.h

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#define FD_SETSIZE 64
+#define FD_ZERO(set) memset((set), 0, sizeof(fd_set));
+#define FD_CLR(fd, set) ((set)->bits[(fd / 8)] &= ~(1 << (fd) % 8))
+#define FD_SET(fd, set) ((set)->bits[(fd / 8)] |= (1 << (fd) % 8))
+#define FD_ISSET(fd, set) ((set)->bits[(fd / 8)] & (1 << (fd) % 8))
+
+struct __fd_set {
+    unsigned char bits[FD_SETSIZE / 8];
+};
+
+typedef struct __fd_set fd_set;

Userland/Libraries/LibC/float.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once

Userland/Libraries/LibC/getopt.cpp

@@ -0,0 +1,369 @@
+/*
+ * Copyright (c) 2020, Sergey Bugaev <bugaevc@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/StringView.h>
+#include <AK/Vector.h>
+#include <getopt.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+int opterr = 1;
+int optopt = 0;
+int optind = 1;
+int optreset = 0;
+char* optarg = nullptr;
+
+// POSIX says, "When an element of argv[] contains multiple option characters,
+// it is unspecified how getopt() determines which options have already been
+// processed". Well, this is how we do it.
+static size_t s_index_into_multioption_argument = 0;
+
+static inline void report_error(const char* format, ...)
+{
+    if (!opterr)
+        return;
+
+    fputs("\033[31m", stderr);
+
+    va_list ap;
+    va_start(ap, format);
+    vfprintf(stderr, format, ap);
+    va_end(ap);
+
+    fputs("\033[0m\n", stderr);
+}
+
+namespace {
+
+class OptionParser {
+public:
+    OptionParser(int argc, char** argv, const StringView& short_options, const option* long_options, int* out_long_option_index = nullptr);
+    int getopt();
+
+private:
+    bool lookup_short_option(char option, int& needs_value) const;
+    int handle_short_option();
+
+    const option* lookup_long_option(char* raw) const;
+    int handle_long_option();
+
+    void shift_argv();
+    bool find_next_option();
+
+    size_t m_argc { 0 };
+    char** m_argv { nullptr };
+    StringView m_short_options;
+    const option* m_long_options { nullptr };
+    int* m_out_long_option_index { nullptr };
+    bool m_stop_on_first_non_option { false };
+
+    size_t m_arg_index { 0 };
+    size_t m_consumed_args { 0 };
+};
+
+OptionParser::OptionParser(int argc, char** argv, const StringView& short_options, const option* long_options, int* out_long_option_index)
+    : m_argc(argc)
+    , m_argv(argv)
+    , m_short_options(short_options)
+    , m_long_options(long_options)
+    , m_out_long_option_index(out_long_option_index)
+{
+    // In the following case:
+    // $ foo bar -o baz
+    // we want to parse the option (-o baz) first, and leave the argument (bar)
+    // in argv after we return -1 when invoked the second time. So we reorder
+    // argv to put options first and positional arguments next. To turn this
+    // behavior off, start the short options spec with a "+". This is a GNU
+    // extension that we support.
+    m_stop_on_first_non_option = short_options.starts_with('+');
+
+    // See if we should reset the internal state.
+    if (optreset || optind == 0) {
+        optreset = 0;
+        optind = 1;
+        s_index_into_multioption_argument = 0;
+    }
+
+    optopt = 0;
+    optarg = nullptr;
+}
+
+int OptionParser::getopt()
+{
+    bool should_reorder_argv = !m_stop_on_first_non_option;
+    int res = -1;
+
+    bool found_an_option = find_next_option();
+    StringView arg = m_argv[m_arg_index];
+
+    if (!found_an_option) {
+        res = -1;
+        if (arg == "--")
+            m_consumed_args = 1;
+        else
+            m_consumed_args = 0;
+    } else {
+        // Alright, so we have an option on our hands!
+        bool is_long_option = arg.starts_with("--");
+        if (is_long_option)
+            res = handle_long_option();
+        else
+            res = handle_short_option();
+
+        // If we encountered an error, return immediately.
+        if (res == '?')
+            return '?';
+    }
+
+    if (should_reorder_argv)
+        shift_argv();
+    else
+        ASSERT(optind == static_cast<int>(m_arg_index));
+    optind += m_consumed_args;
+
+    return res;
+}
+
+bool OptionParser::lookup_short_option(char option, int& needs_value) const
+{
+    Vector<StringView> parts = m_short_options.split_view(option, true);
+
+    ASSERT(parts.size() <= 2);
+    if (parts.size() < 2) {
+        // Haven't found the option in the spec.
+        return false;
+    }
+
+    if (parts[1].starts_with("::")) {
+        // If an option is followed by two colons, it optionally accepts an
+        // argument.
+        needs_value = optional_argument;
+    } else if (parts[1].starts_with(':')) {
+        // If it's followed by one colon, it requires an argument.
+        needs_value = required_argument;
+    } else {
+        // Otherwise, it doesn't accept arguments.
+        needs_value = no_argument;
+    }
+    return true;
+}
+
+int OptionParser::handle_short_option()
+{
+    StringView arg = m_argv[m_arg_index];
+    ASSERT(arg.starts_with('-'));
+
+    if (s_index_into_multioption_argument == 0) {
+        // Just starting to parse this argument, skip the "-".
+        s_index_into_multioption_argument = 1;
+    }
+    char option = arg[s_index_into_multioption_argument];
+    s_index_into_multioption_argument++;
+
+    int needs_value = no_argument;
+    bool ok = lookup_short_option(option, needs_value);
+    if (!ok) {
+        optopt = option;
+        report_error("Unrecognized option \033[1m-%c\033[22m", option);
+        return '?';
+    }
+
+    // Let's see if we're at the end of this argument already.
+    if (s_index_into_multioption_argument < arg.length()) {
+        // This not yet the end.
+        if (needs_value == no_argument) {
+            optarg = nullptr;
+            m_consumed_args = 0;
+        } else {
+            // Treat the rest of the argument as the value, the "-ovalue"
+            // syntax.
+            optarg = m_argv[m_arg_index] + s_index_into_multioption_argument;
+            // Next time, process the next argument.
+            s_index_into_multioption_argument = 0;
+            m_consumed_args = 1;
+        }
+    } else {
+        s_index_into_multioption_argument = 0;
+        if (needs_value != required_argument) {
+            optarg = nullptr;
+            m_consumed_args = 1;
+        } else if (m_arg_index + 1 < m_argc) {
+            // Treat the next argument as a value, the "-o value" syntax.
+            optarg = m_argv[m_arg_index + 1];
+            m_consumed_args = 2;
+        } else {
+            report_error("Missing value for option \033[1m-%c\033[22m", option);
+            return '?';
+        }
+    }
+
+    return option;
+}
+
+const option* OptionParser::lookup_long_option(char* raw) const
+{
+    StringView arg = raw;
+
+    for (size_t index = 0; m_long_options[index].name; index++) {
+        auto& option = m_long_options[index];
+        StringView name = option.name;
+
+        if (!arg.starts_with(name))
+            continue;
+
+        // It would be better to not write out the index at all unless we're
+        // sure we've found the right option, but whatever.
+        if (m_out_long_option_index)
+            *m_out_long_option_index = index;
+
+        // Can either be "--option" or "--option=value".
+        if (arg.length() == name.length()) {
+            optarg = nullptr;
+            return &option;
+        }
+        ASSERT(arg.length() > name.length());
+        if (arg[name.length()] == '=') {
+            optarg = raw + name.length() + 1;
+            return &option;
+        }
+    }
+
+    return nullptr;
+}
+
+int OptionParser::handle_long_option()
+{
+    ASSERT(StringView(m_argv[m_arg_index]).starts_with("--"));
+
+    // We cannot set optopt to anything sensible for long options, so set it to 0.
+    optopt = 0;
+
+    auto* option = lookup_long_option(m_argv[m_arg_index] + 2);
+    if (!option) {
+        report_error("Unrecognized option \033[1m%s\033[22m", m_argv[m_arg_index]);
+        return '?';
+    }
+    // lookup_long_option() will also set optarg if the value of the option is
+    // specified using "--option=value" syntax.
+
+    // Figure out whether this option needs and/or has a value (also called "an
+    // argument", but let's not call it that to distinguish it from argv
+    // elements).
+    switch (option->has_arg) {
+    case no_argument:
+        if (optarg) {
+            report_error("Option \033[1m--%s\033[22m doesn't accept an argument", option->name);
+            return '?';
+        }
+        m_consumed_args = 1;
+        break;
+    case optional_argument:
+        m_consumed_args = 1;
+        break;
+    case required_argument:
+        if (optarg) {
+            // Value specified using "--option=value" syntax.
+            m_consumed_args = 1;
+        } else if (m_arg_index + 1 < m_argc) {
+            // Treat the next argument as a value in "--option value" syntax.
+            optarg = m_argv[m_arg_index + 1];
+            m_consumed_args = 2;
+        } else {
+            report_error("Missing value for option \033[1m--%s\033[22m", option->name);
+            return '?';
+        }
+        break;
+    default:
+        ASSERT_NOT_REACHED();
+    }
+
+    // Now that we've figured the value out, see about reporting this option to
+    // our caller.
+    if (option->flag) {
+        *option->flag = option->val;
+        return 0;
+    }
+    return option->val;
+}
+
+void OptionParser::shift_argv()
+{
+    // We've just parsed an option (which perhaps has a value).
+    // Put the option (along with it value, if any) in front of other arguments.
+    ASSERT(optind <= static_cast<int>(m_arg_index));
+
+    if (optind == static_cast<int>(m_arg_index) || m_consumed_args == 0) {
+        // Nothing to do!
+        return;
+    }
+
+    char* buffer[m_consumed_args];
+    memcpy(buffer, &m_argv[m_arg_index], sizeof(char*) * m_consumed_args);
+    memmove(&m_argv[optind + m_consumed_args], &m_argv[optind], sizeof(char*) * (m_arg_index - optind));
+    memcpy(&m_argv[optind], buffer, sizeof(char*) * m_consumed_args);
+}
+
+bool OptionParser::find_next_option()
+{
+    for (m_arg_index = optind; m_arg_index < m_argc && m_argv[m_arg_index]; m_arg_index++) {
+        StringView arg = m_argv[m_arg_index];
+        // Anything that doesn't start with a "-" is not an option.
+        if (!arg.starts_with('-')) {
+            if (m_stop_on_first_non_option)
+                return false;
+            continue;
+        }
+        // As a special case, a single "-" is not an option either.
+        // (It's typically used by programs to refer to stdin).
+        if (arg == "-")
+            continue;
+        // As another special case, a "--" is not an option either, and we stop
+        // looking for further options if we encounter it.
+        if (arg == "--")
+            return false;
+        // Otherwise, we have found an option!
+        return true;
+    }
+
+    // Reached the end and still found no options.
+    return false;
+}
+
+}
+
+int getopt(int argc, char** argv, const char* short_options)
+{
+    option dummy { nullptr, 0, nullptr, 0 };
+    OptionParser parser { argc, argv, short_options, &dummy };
+    return parser.getopt();
+}
+
+int getopt_long(int argc, char** argv, const char* short_options, const struct option* long_options, int* out_long_option_index)
+{
+    OptionParser parser { argc, argv, short_options, long_options, out_long_option_index };
+    return parser.getopt();
+}

Userland/Libraries/LibC/getopt.h

@@ -0,0 +1,46 @@
+/*
+ * Copyright (c) 2020, Sergey Bugaev <bugaevc@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#define no_argument 0
+#define required_argument 1
+#define optional_argument 2
+
+struct option {
+    const char* name;
+    int has_arg;
+    int* flag;
+    int val;
+};
+
+int getopt_long(int argc, char** argv, const char* short_options, const struct option* long_options, int* out_long_option_index);
+
+__END_DECLS

Userland/Libraries/LibC/grp.cpp

@@ -0,0 +1,182 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/String.h>
+#include <AK/Vector.h>
+#include <errno_numbers.h>
+#include <grp.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+extern "C" {
+
+static FILE* s_stream = nullptr;
+static unsigned s_line_number = 0;
+static struct group s_group;
+
+static String s_name;
+static String s_passwd;
+static Vector<String> s_members;
+static Vector<const char*> s_members_ptrs;
+
+void setgrent()
+{
+    s_line_number = 0;
+    if (s_stream) {
+        rewind(s_stream);
+    } else {
+        s_stream = fopen("/etc/group", "r");
+        if (!s_stream) {
+            perror("open /etc/group");
+        }
+    }
+}
+
+void endgrent()
+{
+    s_line_number = 0;
+    if (s_stream) {
+        fclose(s_stream);
+        s_stream = nullptr;
+    }
+
+    memset(&s_group, 0, sizeof(s_group));
+
+    s_name = {};
+    s_passwd = {};
+    s_members = {};
+    s_members_ptrs = {};
+}
+
+struct group* getgrgid(gid_t gid)
+{
+    setgrent();
+    while (auto* gr = getgrent()) {
+        if (gr->gr_gid == gid)
+            return gr;
+    }
+    return nullptr;
+}
+
+struct group* getgrnam(const char* name)
+{
+    setgrent();
+    while (auto* gr = getgrent()) {
+        if (!strcmp(gr->gr_name, name))
+            return gr;
+    }
+    return nullptr;
+}
+
+static bool parse_grpdb_entry(const String& line)
+{
+    auto parts = line.split_view(':', true);
+    if (parts.size() != 4) {
+        fprintf(stderr, "getgrent(): Malformed entry on line %u: '%s' has %zu parts\n", s_line_number, line.characters(), parts.size());
+        return false;
+    }
+
+    s_name = parts[0];
+    s_passwd = parts[1];
+
+    auto& gid_string = parts[2];
+    String members_string = parts[3];
+
+    auto gid = gid_string.to_uint();
+    if (!gid.has_value()) {
+        fprintf(stderr, "getgrent(): Malformed GID on line %u\n", s_line_number);
+        return false;
+    }
+
+    s_members = members_string.split(',');
+    s_members_ptrs.clear_with_capacity();
+    s_members_ptrs.ensure_capacity(s_members.size() + 1);
+    for (auto& member : s_members) {
+        s_members_ptrs.append(member.characters());
+    }
+    s_members_ptrs.append(nullptr);
+
+    s_group.gr_gid = gid.value();
+    s_group.gr_name = const_cast<char*>(s_name.characters());
+    s_group.gr_passwd = const_cast<char*>(s_passwd.characters());
+    s_group.gr_mem = const_cast<char**>(s_members_ptrs.data());
+
+    return true;
+}
+
+struct group* getgrent()
+{
+    if (!s_stream)
+        setgrent();
+
+    while (true) {
+        if (!s_stream || feof(s_stream))
+            return nullptr;
+
+        if (ferror(s_stream)) {
+            fprintf(stderr, "getgrent(): Read error: %s\n", strerror(ferror(s_stream)));
+            return nullptr;
+        }
+
+        char buffer[1024];
+        ++s_line_number;
+        char* s = fgets(buffer, sizeof(buffer), s_stream);
+
+        // Silently tolerate an empty line at the end.
+        if ((!s || !s[0]) && feof(s_stream))
+            return nullptr;
+
+        String line(s, Chomp);
+        if (parse_grpdb_entry(line))
+            return &s_group;
+        // Otherwise, proceed to the next line.
+    }
+}
+
+int initgroups(const char* user, gid_t extra_gid)
+{
+    size_t count = 0;
+    gid_t gids[32];
+    bool extra_gid_added = false;
+    setgrent();
+    while (auto* gr = getgrent()) {
+        for (auto* mem = gr->gr_mem; *mem; ++mem) {
+            if (!strcmp(*mem, user)) {
+                gids[count++] = gr->gr_gid;
+                if (gr->gr_gid == extra_gid)
+                    extra_gid_added = true;
+                break;
+            }
+        }
+    }
+    endgrent();
+    if (!extra_gid_added)
+        gids[count++] = extra_gid;
+    return setgroups(count, gids);
+}
+}

Userland/Libraries/LibC/grp.h

@@ -0,0 +1,49 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+struct group {
+    char* gr_name;
+    char* gr_passwd;
+    gid_t gr_gid;
+    char** gr_mem;
+};
+
+struct group* getgrent();
+void setgrent();
+void endgrent();
+struct group* getgrnam(const char* name);
+struct group* getgrgid(gid_t);
+
+int initgroups(const char* user, gid_t);
+
+__END_DECLS

Userland/Libraries/LibC/iconv.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <stddef.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+typedef void* iconv_t;
+
+extern iconv_t iconv_open(const char* tocode, const char* fromcode);
+extern size_t iconv(iconv_t, char** inbuf, size_t* inbytesleft, char** outbuf, size_t* outbytesleft);
+extern int iconv_close(iconv_t);
+
+__END_DECLS

Userland/Libraries/LibC/inttypes.h

@@ -0,0 +1,70 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <bits/stdint.h>
+
+#define PRId8 "d"
+#define PRId16 "d"
+#define PRId32 "d"
+#define PRId64 "lld"
+#define PRIi8 "d"
+#define PRIi16 "d"
+#define PRIi32 "d"
+#define PRIi64 "lld"
+#define PRIu8 "u"
+#define PRIo8 "o"
+#define PRIo16 "o"
+#define PRIo32 "o"
+#define PRIo64 "llo"
+#define PRIu16 "u"
+#define PRIu32 "u"
+#define PRIu64 "llu"
+#define PRIx8 "b"
+#define PRIx16 "w"
+#define PRIx32 "x"
+#define PRIX32 "X"
+#define PRIx64 "llx"
+#define PRIX64 "llX"
+
+#define __PRI64_PREFIX "ll"
+#define __PRIPTR_PREFIX
+
+#define PRIdPTR __PRIPTR_PREFIX "d"
+#define PRIiPTR __PRIPTR_PREFIX "i"
+#define PRIXPTR __PRIPTR_PREFIX "X"
+
+#define PRIdMAX __PRI64_PREFIX "d"
+#define PRIoMAX __PRI64_PREFIX "o"
+#define PRIuMAX __PRI64_PREFIX "u"
+
+#define SCNdMAX __PRI64_PREFIX "d"
+#define SCNoMAX __PRI64_PREFIX "o"
+#define SCNuMAX __PRI64_PREFIX "u"
+
+#define SCNu64 __PRI64_PREFIX "u"
+#define SCNd64 __PRI64_PREFIX "d"

Userland/Libraries/LibC/ioctl.cpp

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/API/Syscall.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <sys/ioctl.h>
+
+extern "C" {
+
+int ioctl(int fd, unsigned request, ...)
+{
+    va_list ap;
+    va_start(ap, request);
+    unsigned arg = va_arg(ap, unsigned);
+    int rc = syscall(SC_ioctl, fd, request, arg);
+    va_end(ap);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+}

Userland/Libraries/LibC/libcinit.cpp

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/Types.h>
+#include <assert.h>
+#include <sys/internals.h>
+#include <unistd.h>
+
+extern "C" {
+
+#ifdef NO_TLS
+int errno;
+#else
+__thread int errno;
+#endif
+char** environ;
+bool __environ_is_malloced;
+bool __stdio_is_initialized;
+
+void __libc_init()
+{
+    __malloc_init();
+    __stdio_init();
+}
+}

Userland/Libraries/LibC/libgen.cpp

@@ -0,0 +1,84 @@
+/*
+ * Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/Assertions.h>
+#include <libgen.h>
+#include <string.h>
+
+static char dot[] = ".";
+static char slash[] = "/";
+
+char* dirname(char* path)
+{
+    if (path == nullptr)
+        return dot;
+
+    int len = strlen(path);
+    if (len == 0)
+        return dot;
+
+    while (len > 1 && path[len - 1] == '/') {
+        path[len - 1] = 0;
+        len--;
+    }
+
+    char* last_slash = strrchr(path, '/');
+    if (last_slash == nullptr)
+        return dot;
+
+    if (last_slash == path)
+        return slash;
+
+    *last_slash = 0;
+    return path;
+}
+
+char* basename(char* path)
+{
+    if (path == nullptr)
+        return dot;
+
+    int len = strlen(path);
+    if (len == 0)
+        return dot;
+
+    while (len > 1 && path[len - 1] == '/') {
+        path[len - 1] = 0;
+        len--;
+    }
+
+    char* last_slash = strrchr(path, '/');
+    if (last_slash == nullptr)
+        return path;
+
+    if (len == 1) {
+        ASSERT(last_slash == path);
+        ASSERT(path[0] == '/');
+        return slash;
+    }
+
+    return last_slash + 1;
+}

Userland/Libraries/LibC/libgen.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2019-2020, Sergey Bugaev <bugaevc@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+char* dirname(char* path);
+char* basename(char* path);
+
+__END_DECLS

Userland/Libraries/LibC/limits.h

@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <bits/stdint.h>
+
+#ifndef PAGE_SIZE
+#    define PAGE_SIZE 4096
+#endif
+
+#define PATH_MAX 4096
+#if !defined MAXPATHLEN && defined PATH_MAX
+#    define MAXPATHLEN PATH_MAX
+#endif
+
+#define NAME_MAX 255
+
+#define PIPE_BUF 4096
+
+#define INT_MAX INT32_MAX
+#define INT_MIN INT32_MIN
+
+#define UINT_MAX UINT32_MAX
+#define UINT_MIN UINT32_MIN
+
+#define CHAR_BIT 8
+#define SCHAR_MIN (-128)
+#define SCHAR_MAX 127
+#define UCHAR_MAX 255
+
+#define LONG_MAX 2147483647L
+#define LONG_MIN (-LONG_MAX - 1L)
+
+#define ULONG_MAX 4294967295UL
+
+#define LONG_LONG_MAX 9223372036854775807LL
+#define LONG_LONG_MIN (-LONG_LONG_MAX - 1LL)
+
+#define ULONG_LONG_MAX 18446744073709551615ULL
+
+#define CHAR_MIN SCHAR_MIN
+#define CHAR_MAX SCHAR_MAX
+
+#define MB_LEN_MAX 16
+
+#define ARG_MAX 65536
+
+#define PTHREAD_STACK_MIN 65536
+
+#define SSIZE_MAX 2147483647
+
+#ifdef __USE_POSIX
+#    include <bits/posix1_lim.h>
+#endif

Userland/Libraries/LibC/locale.cpp

@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/LogStream.h>
+#include <assert.h>
+#include <locale.h>
+#include <stdio.h>
+
+extern "C" {
+
+static char default_decimal_point[] = ".";
+static char default_thousands_sep[] = ",";
+static char default_grouping[] = "\x03\x03";
+
+static char default_empty_string[] = "";
+static char default_empty_value = 127;
+
+static struct lconv default_locale = {
+    default_decimal_point,
+    default_thousands_sep,
+    default_grouping,
+    default_empty_string,
+    default_empty_string,
+    default_empty_string,
+    default_empty_string,
+    default_empty_string,
+    default_empty_string,
+    default_empty_string,
+    default_empty_value,
+    default_empty_value,
+    default_empty_value,
+    default_empty_value,
+    default_empty_value,
+    default_empty_value,
+    default_empty_value,
+    default_empty_value,
+    default_empty_value,
+    default_empty_value,
+    default_empty_value,
+    default_empty_value,
+    default_empty_value,
+    default_empty_value
+};
+
+char* setlocale(int category, const char* locale)
+{
+    dbgln("FIXME(LibC): setlocale({}, '{}')", category, locale);
+    return nullptr;
+}
+
+struct lconv* localeconv()
+{
+    return &default_locale;
+}
+}

Userland/Libraries/LibC/locale.h

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+enum {
+    LC_ALL,
+    LC_NUMERIC,
+    LC_CTYPE,
+    LC_COLLATE,
+    LC_TIME,
+    LC_MONETARY,
+};
+
+struct lconv {
+    char* decimal_point;
+    char* thousands_sep;
+    char* grouping;
+    char* int_curr_symbol;
+    char* currency_symbol;
+    char* mon_decimal_point;
+    char* mon_thousands_sep;
+    char* mon_grouping;
+    char* positive_sign;
+    char* negative_sign;
+    char int_frac_digits;
+    char frac_digits;
+    char p_cs_precedes;
+    char p_sep_by_space;
+    char n_cs_precedes;
+    char n_sep_by_space;
+    char p_sign_posn;
+    char n_sign_posn;
+    char int_p_cs_precedes;
+    char int_p_sep_by_space;
+    char int_n_cs_precedes;
+    char int_n_sep_by_space;
+    char int_p_sign_posn;
+    char int_n_sign_posn;
+};
+
+struct lconv* localeconv();
+char* setlocale(int category, const char* locale);
+
+__END_DECLS

Userland/Libraries/LibC/malloc.cpp

@@ -0,0 +1,472 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/InlineLinkedList.h>
+#include <AK/LogStream.h>
+#include <AK/ScopedValueRollback.h>
+#include <AK/Vector.h>
+#include <LibThread/Lock.h>
+#include <assert.h>
+#include <mallocdefs.h>
+#include <serenity.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <sys/internals.h>
+#include <sys/mman.h>
+
+// FIXME: Thread safety.
+
+//#define MALLOC_DEBUG
+#define RECYCLE_BIG_ALLOCATIONS
+
+#define PAGE_ROUND_UP(x) ((((size_t)(x)) + PAGE_SIZE - 1) & (~(PAGE_SIZE - 1)))
+
+ALWAYS_INLINE static void ue_notify_malloc(const void* ptr, size_t size)
+{
+    send_secret_data_to_userspace_emulator(1, size, (FlatPtr)ptr);
+}
+
+ALWAYS_INLINE static void ue_notify_free(const void* ptr)
+{
+    send_secret_data_to_userspace_emulator(2, (FlatPtr)ptr, 0);
+}
+
+ALWAYS_INLINE static void ue_notify_realloc(const void* ptr, size_t size)
+{
+    send_secret_data_to_userspace_emulator(3, size, (FlatPtr)ptr);
+}
+
+static LibThread::Lock& malloc_lock()
+{
+    static u32 lock_storage[sizeof(LibThread::Lock) / sizeof(u32)];
+    return *reinterpret_cast<LibThread::Lock*>(&lock_storage);
+}
+
+constexpr size_t number_of_chunked_blocks_to_keep_around_per_size_class = 4;
+constexpr size_t number_of_big_blocks_to_keep_around_per_size_class = 8;
+
+static bool s_log_malloc = false;
+static bool s_scrub_malloc = true;
+static bool s_scrub_free = true;
+static bool s_profiling = false;
+
+struct MallocStats {
+    size_t number_of_malloc_calls;
+
+    size_t number_of_big_allocator_hits;
+    size_t number_of_big_allocator_purge_hits;
+    size_t number_of_big_allocs;
+
+    size_t number_of_empty_block_hits;
+    size_t number_of_empty_block_purge_hits;
+    size_t number_of_block_allocs;
+    size_t number_of_blocks_full;
+
+    size_t number_of_free_calls;
+
+    size_t number_of_big_allocator_keeps;
+    size_t number_of_big_allocator_frees;
+
+    size_t number_of_freed_full_blocks;
+    size_t number_of_keeps;
+    size_t number_of_frees;
+};
+static MallocStats g_malloc_stats = {};
+
+struct Allocator {
+    size_t size { 0 };
+    size_t block_count { 0 };
+    size_t empty_block_count { 0 };
+    ChunkedBlock* empty_blocks[number_of_chunked_blocks_to_keep_around_per_size_class] { nullptr };
+    InlineLinkedList<ChunkedBlock> usable_blocks;
+    InlineLinkedList<ChunkedBlock> full_blocks;
+};
+
+struct BigAllocator {
+    Vector<BigAllocationBlock*, number_of_big_blocks_to_keep_around_per_size_class> blocks;
+};
+
+// Allocators will be initialized in __malloc_init.
+// We can not rely on global constructors to initialize them,
+// because they must be initialized before other global constructors
+// are run. Similarly, we can not allow global destructors to destruct
+// them. We could have used AK::NeverDestoyed to prevent the latter,
+// but it would have not helped with the former.
+static u8 g_allocators_storage[sizeof(Allocator) * num_size_classes];
+static u8 g_big_allocators_storage[sizeof(BigAllocator)];
+
+static inline Allocator (&allocators())[num_size_classes]
+{
+    return reinterpret_cast<Allocator(&)[num_size_classes]>(g_allocators_storage);
+}
+
+static inline BigAllocator (&big_allocators())[1]
+{
+    return reinterpret_cast<BigAllocator(&)[1]>(g_big_allocators_storage);
+}
+
+static Allocator* allocator_for_size(size_t size, size_t& good_size)
+{
+    for (size_t i = 0; size_classes[i]; ++i) {
+        if (size <= size_classes[i]) {
+            good_size = size_classes[i];
+            return &allocators()[i];
+        }
+    }
+    good_size = PAGE_ROUND_UP(size);
+    return nullptr;
+}
+
+#ifdef RECYCLE_BIG_ALLOCATIONS
+static BigAllocator* big_allocator_for_size(size_t size)
+{
+    if (size == 65536)
+        return &big_allocators()[0];
+    return nullptr;
+}
+#endif
+
+extern "C" {
+
+static void* os_alloc(size_t size, const char* name)
+{
+    auto* ptr = serenity_mmap(nullptr, size, PROT_READ | PROT_WRITE, MAP_ANONYMOUS | MAP_PRIVATE, 0, 0, ChunkedBlock::block_size, name);
+    ASSERT(ptr != MAP_FAILED);
+    return ptr;
+}
+
+static void os_free(void* ptr, size_t size)
+{
+    int rc = munmap(ptr, size);
+    assert(rc == 0);
+}
+
+static void* malloc_impl(size_t size)
+{
+    LOCKER(malloc_lock());
+
+    if (s_log_malloc)
+        dbgprintf("LibC: malloc(%zu)\n", size);
+
+    if (!size)
+        return nullptr;
+
+    g_malloc_stats.number_of_malloc_calls++;
+
+    size_t good_size;
+    auto* allocator = allocator_for_size(size, good_size);
+
+    if (!allocator) {
+        size_t real_size = round_up_to_power_of_two(sizeof(BigAllocationBlock) + size, ChunkedBlock::block_size);
+#ifdef RECYCLE_BIG_ALLOCATIONS
+        if (auto* allocator = big_allocator_for_size(real_size)) {
+            if (!allocator->blocks.is_empty()) {
+                g_malloc_stats.number_of_big_allocator_hits++;
+                auto* block = allocator->blocks.take_last();
+                int rc = madvise(block, real_size, MADV_SET_NONVOLATILE);
+                bool this_block_was_purged = rc == 1;
+                if (rc < 0) {
+                    perror("madvise");
+                    ASSERT_NOT_REACHED();
+                }
+                if (mprotect(block, real_size, PROT_READ | PROT_WRITE) < 0) {
+                    perror("mprotect");
+                    ASSERT_NOT_REACHED();
+                }
+                if (this_block_was_purged) {
+                    g_malloc_stats.number_of_big_allocator_purge_hits++;
+                    new (block) BigAllocationBlock(real_size);
+                }
+
+                ue_notify_malloc(&block->m_slot[0], size);
+                return &block->m_slot[0];
+            }
+        }
+#endif
+        g_malloc_stats.number_of_big_allocs++;
+        auto* block = (BigAllocationBlock*)os_alloc(real_size, "malloc: BigAllocationBlock");
+        new (block) BigAllocationBlock(real_size);
+        ue_notify_malloc(&block->m_slot[0], size);
+        return &block->m_slot[0];
+    }
+
+    ChunkedBlock* block = nullptr;
+
+    for (block = allocator->usable_blocks.head(); block; block = block->next()) {
+        if (block->free_chunks())
+            break;
+    }
+
+    if (!block && allocator->empty_block_count) {
+        g_malloc_stats.number_of_empty_block_hits++;
+        block = allocator->empty_blocks[--allocator->empty_block_count];
+        int rc = madvise(block, ChunkedBlock::block_size, MADV_SET_NONVOLATILE);
+        bool this_block_was_purged = rc == 1;
+        if (rc < 0) {
+            perror("madvise");
+            ASSERT_NOT_REACHED();
+        }
+        rc = mprotect(block, ChunkedBlock::block_size, PROT_READ | PROT_WRITE);
+        if (rc < 0) {
+            perror("mprotect");
+            ASSERT_NOT_REACHED();
+        }
+        if (this_block_was_purged) {
+            g_malloc_stats.number_of_empty_block_purge_hits++;
+            new (block) ChunkedBlock(good_size);
+        }
+        allocator->usable_blocks.append(block);
+    }
+
+    if (!block) {
+        g_malloc_stats.number_of_block_allocs++;
+        char buffer[64];
+        snprintf(buffer, sizeof(buffer), "malloc: ChunkedBlock(%zu)", good_size);
+        block = (ChunkedBlock*)os_alloc(ChunkedBlock::block_size, buffer);
+        new (block) ChunkedBlock(good_size);
+        allocator->usable_blocks.append(block);
+        ++allocator->block_count;
+    }
+
+    --block->m_free_chunks;
+    void* ptr = block->m_freelist;
+    ASSERT(ptr);
+    block->m_freelist = block->m_freelist->next;
+    if (block->is_full()) {
+        g_malloc_stats.number_of_blocks_full++;
+#ifdef MALLOC_DEBUG
+        dbgprintf("Block %p is now full in size class %zu\n", block, good_size);
+#endif
+        allocator->usable_blocks.remove(block);
+        allocator->full_blocks.append(block);
+    }
+#ifdef MALLOC_DEBUG
+    dbgprintf("LibC: allocated %p (chunk in block %p, size %zu)\n", ptr, block, block->bytes_per_chunk());
+#endif
+
+    if (s_scrub_malloc)
+        memset(ptr, MALLOC_SCRUB_BYTE, block->m_size);
+
+    ue_notify_malloc(ptr, size);
+    return ptr;
+}
+
+static void free_impl(void* ptr)
+{
+    ScopedValueRollback rollback(errno);
+
+    if (!ptr)
+        return;
+
+    g_malloc_stats.number_of_free_calls++;
+
+    LOCKER(malloc_lock());
+
+    void* block_base = (void*)((FlatPtr)ptr & ChunkedBlock::ChunkedBlock::block_mask);
+    size_t magic = *(size_t*)block_base;
+
+    if (magic == MAGIC_BIGALLOC_HEADER) {
+        auto* block = (BigAllocationBlock*)block_base;
+#ifdef RECYCLE_BIG_ALLOCATIONS
+        if (auto* allocator = big_allocator_for_size(block->m_size)) {
+            if (allocator->blocks.size() < number_of_big_blocks_to_keep_around_per_size_class) {
+                g_malloc_stats.number_of_big_allocator_keeps++;
+                allocator->blocks.append(block);
+                size_t this_block_size = block->m_size;
+                if (mprotect(block, this_block_size, PROT_NONE) < 0) {
+                    perror("mprotect");
+                    ASSERT_NOT_REACHED();
+                }
+                if (madvise(block, this_block_size, MADV_SET_VOLATILE) != 0) {
+                    perror("madvise");
+                    ASSERT_NOT_REACHED();
+                }
+                return;
+            }
+        }
+#endif
+        g_malloc_stats.number_of_big_allocator_frees++;
+        os_free(block, block->m_size);
+        return;
+    }
+
+    assert(magic == MAGIC_PAGE_HEADER);
+    auto* block = (ChunkedBlock*)block_base;
+
+#ifdef MALLOC_DEBUG
+    dbgprintf("LibC: freeing %p in allocator %p (size=%zu, used=%zu)\n", ptr, block, block->bytes_per_chunk(), block->used_chunks());
+#endif
+
+    if (s_scrub_free)
+        memset(ptr, FREE_SCRUB_BYTE, block->bytes_per_chunk());
+
+    auto* entry = (FreelistEntry*)ptr;
+    entry->next = block->m_freelist;
+    block->m_freelist = entry;
+
+    if (block->is_full()) {
+        size_t good_size;
+        auto* allocator = allocator_for_size(block->m_size, good_size);
+#ifdef MALLOC_DEBUG
+        dbgprintf("Block %p no longer full in size class %zu\n", block, good_size);
+#endif
+        g_malloc_stats.number_of_freed_full_blocks++;
+        allocator->full_blocks.remove(block);
+        allocator->usable_blocks.prepend(block);
+    }
+
+    ++block->m_free_chunks;
+
+    if (!block->used_chunks()) {
+        size_t good_size;
+        auto* allocator = allocator_for_size(block->m_size, good_size);
+        if (allocator->block_count < number_of_chunked_blocks_to_keep_around_per_size_class) {
+#ifdef MALLOC_DEBUG
+            dbgprintf("Keeping block %p around for size class %zu\n", block, good_size);
+#endif
+            g_malloc_stats.number_of_keeps++;
+            allocator->usable_blocks.remove(block);
+            allocator->empty_blocks[allocator->empty_block_count++] = block;
+            mprotect(block, ChunkedBlock::block_size, PROT_NONE);
+            madvise(block, ChunkedBlock::block_size, MADV_SET_VOLATILE);
+            return;
+        }
+#ifdef MALLOC_DEBUG
+        dbgprintf("Releasing block %p for size class %zu\n", block, good_size);
+#endif
+        g_malloc_stats.number_of_frees++;
+        allocator->usable_blocks.remove(block);
+        --allocator->block_count;
+        os_free(block, ChunkedBlock::block_size);
+    }
+}
+
+[[gnu::flatten]] void* malloc(size_t size)
+{
+    void* ptr = malloc_impl(size);
+    if (s_profiling)
+        perf_event(PERF_EVENT_MALLOC, size, reinterpret_cast<FlatPtr>(ptr));
+    return ptr;
+}
+
+[[gnu::flatten]] void free(void* ptr)
+{
+    if (s_profiling)
+        perf_event(PERF_EVENT_FREE, reinterpret_cast<FlatPtr>(ptr), 0);
+    ue_notify_free(ptr);
+    free_impl(ptr);
+}
+
+void* calloc(size_t count, size_t size)
+{
+    size_t new_size = count * size;
+    auto* ptr = malloc(new_size);
+    if (ptr)
+        memset(ptr, 0, new_size);
+    return ptr;
+}
+
+size_t malloc_size(void* ptr)
+{
+    if (!ptr)
+        return 0;
+    LOCKER(malloc_lock());
+    void* page_base = (void*)((FlatPtr)ptr & ChunkedBlock::block_mask);
+    auto* header = (const CommonHeader*)page_base;
+    auto size = header->m_size;
+    if (header->m_magic == MAGIC_BIGALLOC_HEADER)
+        size -= sizeof(CommonHeader);
+    else
+        ASSERT(header->m_magic == MAGIC_PAGE_HEADER);
+    return size;
+}
+
+void* realloc(void* ptr, size_t size)
+{
+    if (!ptr)
+        return malloc(size);
+    if (!size)
+        return nullptr;
+
+    LOCKER(malloc_lock());
+    auto existing_allocation_size = malloc_size(ptr);
+
+    if (size <= existing_allocation_size) {
+        ue_notify_realloc(ptr, size);
+        return ptr;
+    }
+    auto* new_ptr = malloc(size);
+    if (new_ptr) {
+        memcpy(new_ptr, ptr, min(existing_allocation_size, size));
+        free(ptr);
+    }
+    return new_ptr;
+}
+
+void __malloc_init()
+{
+    new (&malloc_lock()) LibThread::Lock();
+    if (getenv("LIBC_NOSCRUB_MALLOC"))
+        s_scrub_malloc = false;
+    if (getenv("LIBC_NOSCRUB_FREE"))
+        s_scrub_free = false;
+    if (getenv("LIBC_LOG_MALLOC"))
+        s_log_malloc = true;
+    if (getenv("LIBC_PROFILE_MALLOC"))
+        s_profiling = true;
+
+    for (size_t i = 0; i < num_size_classes; ++i) {
+        new (&allocators()[i]) Allocator();
+        allocators()[i].size = size_classes[i];
+    }
+
+    new (&big_allocators()[0])(BigAllocator);
+}
+
+void serenity_dump_malloc_stats()
+{
+    dbgln("# malloc() calls: {}", g_malloc_stats.number_of_malloc_calls);
+    dbgln();
+    dbgln("big alloc hits: {}", g_malloc_stats.number_of_big_allocator_hits);
+    dbgln("big alloc hits that were purged: {}", g_malloc_stats.number_of_big_allocator_purge_hits);
+    dbgln("big allocs: {}", g_malloc_stats.number_of_big_allocs);
+    dbgln();
+    dbgln("empty block hits: {}", g_malloc_stats.number_of_empty_block_hits);
+    dbgln("empty block hits that were purged: {}", g_malloc_stats.number_of_empty_block_purge_hits);
+    dbgln("block allocs: {}", g_malloc_stats.number_of_block_allocs);
+    dbgln("filled blocks: {}", g_malloc_stats.number_of_blocks_full);
+    dbgln();
+    dbgln("# free() calls: {}", g_malloc_stats.number_of_free_calls);
+    dbgln();
+    dbgln("big alloc keeps: {}", g_malloc_stats.number_of_big_allocator_keeps);
+    dbgln("big alloc frees: {}", g_malloc_stats.number_of_big_allocator_frees);
+    dbgln();
+    dbgln("full block frees: {}", g_malloc_stats.number_of_freed_full_blocks);
+    dbgln("number of keeps: {}", g_malloc_stats.number_of_keeps);
+    dbgln("number of frees: {}", g_malloc_stats.number_of_frees);
+}
+}

Userland/Libraries/LibC/mallocdefs.h

@@ -0,0 +1,95 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/InlineLinkedList.h>
+#include <AK/Types.h>
+
+#define MAGIC_PAGE_HEADER 0x42657274     // 'Bert'
+#define MAGIC_BIGALLOC_HEADER 0x42697267 // 'Birg'
+#define MALLOC_SCRUB_BYTE 0xdc
+#define FREE_SCRUB_BYTE 0xed
+
+static constexpr unsigned short size_classes[] = { 8, 16, 32, 64, 128, 256, 500, 1016, 2032, 4088, 8184, 16376, 32752, 0 };
+static constexpr size_t num_size_classes = (sizeof(size_classes) / sizeof(unsigned short)) - 1;
+
+struct CommonHeader {
+    size_t m_magic;
+    size_t m_size;
+};
+
+struct BigAllocationBlock : public CommonHeader {
+    BigAllocationBlock(size_t size)
+    {
+        m_magic = MAGIC_BIGALLOC_HEADER;
+        m_size = size;
+    }
+    unsigned char* m_slot[0];
+};
+
+struct FreelistEntry {
+    FreelistEntry* next;
+};
+
+struct ChunkedBlock
+    : public CommonHeader
+    , public InlineLinkedListNode<ChunkedBlock> {
+
+    static constexpr size_t block_size = 64 * KiB;
+    static constexpr size_t block_mask = ~(block_size - 1);
+
+    ChunkedBlock(size_t bytes_per_chunk)
+    {
+        m_magic = MAGIC_PAGE_HEADER;
+        m_size = bytes_per_chunk;
+        m_free_chunks = chunk_capacity();
+        m_freelist = (FreelistEntry*)chunk(0);
+        for (size_t i = 0; i < chunk_capacity(); ++i) {
+            auto* entry = (FreelistEntry*)chunk(i);
+            if (i != chunk_capacity() - 1)
+                entry->next = (FreelistEntry*)chunk(i + 1);
+            else
+                entry->next = nullptr;
+        }
+    }
+
+    ChunkedBlock* m_prev { nullptr };
+    ChunkedBlock* m_next { nullptr };
+    FreelistEntry* m_freelist { nullptr };
+    size_t m_free_chunks { 0 };
+    [[gnu::aligned(8)]] unsigned char m_slot[0];
+
+    void* chunk(size_t index)
+    {
+        return &m_slot[index * m_size];
+    }
+    bool is_full() const { return m_free_chunks == 0; }
+    size_t bytes_per_chunk() const { return m_size; }
+    size_t free_chunks() const { return m_free_chunks; }
+    size_t used_chunks() const { return chunk_capacity() - m_free_chunks; }
+    size_t chunk_capacity() const { return (block_size - sizeof(ChunkedBlock)) / m_size; }
+};

Userland/Libraries/LibC/memory.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <string.h>

Userland/Libraries/LibC/mman.cpp

@@ -0,0 +1,111 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/API/Syscall.h>
+#include <errno.h>
+#include <mman.h>
+#include <stdio.h>
+#include <string.h>
+
+extern "C" {
+
+void* serenity_mmap(void* addr, size_t size, int prot, int flags, int fd, off_t offset, size_t alignment, const char* name)
+{
+    Syscall::SC_mmap_params params { (uintptr_t)addr, size, alignment, prot, flags, fd, offset, { name, name ? strlen(name) : 0 } };
+    ssize_t rc = syscall(SC_mmap, &params);
+    if (rc < 0 && -rc < EMAXERRNO) {
+        errno = -rc;
+        return MAP_FAILED;
+    }
+    return (void*)rc;
+}
+
+void* mmap(void* addr, size_t size, int prot, int flags, int fd, off_t offset)
+{
+    return serenity_mmap(addr, size, prot, flags, fd, offset, PAGE_SIZE, nullptr);
+}
+
+void* mmap_with_name(void* addr, size_t size, int prot, int flags, int fd, off_t offset, const char* name)
+{
+    return serenity_mmap(addr, size, prot, flags, fd, offset, PAGE_SIZE, name);
+}
+
+void* mremap(void* old_address, size_t old_size, size_t new_size, int flags)
+{
+    Syscall::SC_mremap_params params { (uintptr_t)old_address, old_size, new_size, flags };
+    ssize_t rc = syscall(SC_mremap, &params);
+    if (rc < 0 && -rc < EMAXERRNO) {
+        errno = -rc;
+        return MAP_FAILED;
+    }
+    return (void*)rc;
+}
+
+int munmap(void* addr, size_t size)
+{
+    int rc = syscall(SC_munmap, addr, size);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int mprotect(void* addr, size_t size, int prot)
+{
+    int rc = syscall(SC_mprotect, addr, size, prot);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int set_mmap_name(void* addr, size_t size, const char* name)
+{
+    if (!name) {
+        errno = EFAULT;
+        return -1;
+    }
+    Syscall::SC_set_mmap_name_params params { addr, size, { name, strlen(name) } };
+    int rc = syscall(SC_set_mmap_name, &params);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int madvise(void* address, size_t size, int advice)
+{
+    int rc = syscall(SC_madvise, address, size, advice);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int minherit(void* address, size_t size, int inherit)
+{
+    int rc = syscall(SC_minherit, address, size, inherit);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+void* allocate_tls(size_t size)
+{
+    int rc = syscall(SC_allocate_tls, size);
+    if (rc < 0 && -rc < EMAXERRNO) {
+        errno = -rc;
+        return MAP_FAILED;
+    }
+    return (void*)rc;
+}
+}

Userland/Libraries/LibC/mman.h

@@ -0,0 +1,67 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+#define MAP_FILE 0x00
+#define MAP_SHARED 0x01
+#define MAP_PRIVATE 0x02
+#define MAP_FIXED 0x10
+#define MAP_ANONYMOUS 0x20
+#define MAP_ANON MAP_ANONYMOUS
+#define MAP_STACK 0x40
+#define MAP_NORESERVE 0x80
+
+#define PROT_READ 0x1
+#define PROT_WRITE 0x2
+#define PROT_EXEC 0x4
+#define PROT_NONE 0x0
+
+#define MAP_FAILED ((void*)-1)
+
+#define MADV_SET_VOLATILE 0x100
+#define MADV_SET_NONVOLATILE 0x200
+#define MADV_GET_VOLATILE 0x400
+
+#define MAP_INHERIT_ZERO 1
+
+__BEGIN_DECLS
+
+void* mmap(void* addr, size_t, int prot, int flags, int fd, off_t);
+void* mmap_with_name(void* addr, size_t, int prot, int flags, int fd, off_t, const char* name);
+void* serenity_mmap(void* addr, size_t, int prot, int flags, int fd, off_t, size_t alignment, const char* name);
+void* mremap(void* old_address, size_t old_size, size_t new_size, int flags);
+int munmap(void*, size_t);
+int mprotect(void*, size_t, int prot);
+int set_mmap_name(void*, size_t, const char*);
+int madvise(void*, size_t, int advice);
+int minherit(void*, size_t, int inherit);
+void* allocate_tls(size_t);
+
+__END_DECLS

Userland/Libraries/LibC/mntent.cpp

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <assert.h>
+#include <mntent.h>
+
+extern "C" {
+
+struct mntent* getmntent(FILE*)
+{
+    ASSERT_NOT_REACHED();
+    return nullptr;
+}
+}

Userland/Libraries/LibC/mntent.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <stdio.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#define MOUNTED "/etc/mtab"
+#define MNTTAB "/etc/fstab"
+
+struct mntent {
+    char* mnt_fsname;
+    char* mnt_dir;
+    char* mnt_type;
+    char* mnt_opts;
+    int mnt_freq;
+    int mnt_passno;
+};
+
+struct mntent* getmntent(FILE* stream);
+
+__END_DECLS

Userland/Libraries/LibC/net/if.h

@@ -0,0 +1,71 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/socket.h>
+
+__BEGIN_DECLS
+
+struct ifreq {
+#define IFNAMSIZ 16
+    char ifr_name[IFNAMSIZ];
+    union {
+        struct sockaddr ifru_addr;
+        struct sockaddr ifru_dstaddr;
+        struct sockaddr ifru_broadaddr;
+        struct sockaddr ifru_netmask;
+        struct sockaddr ifru_hwaddr;
+        short ifru_flags;
+        int ifru_metric;
+        int64_t ifru_vnetid;
+        uint64_t ifru_media;
+        void* ifru_data;
+        unsigned int ifru_index;
+    } ifr_ifru;
+
+    // clang-format off
+#define ifr_addr ifr_ifru.ifru_addr           // address
+#define ifr_dstaddr ifr_ifru.ifru_dstaddr     // other end of p-to-p link
+#define ifr_broadaddr ifr_ifru.ifru_broadaddr // broadcast address
+#define ifr_netmask ifr_ifru.ifru_netmask     // network mask
+#define ifr_flags ifr_ifru.ifru_flags         // flags
+#define ifr_metric ifr_ifru.ifru_metric       // metric
+#define ifr_mtu ifr_ifru.ifru_metric          // mtu (overload)
+#define ifr_hardmtu ifr_ifru.ifru_metric      // hardmtu (overload)
+#define ifr_media ifr_ifru.ifru_media         // media options
+#define ifr_rdomainid ifr_ifru.ifru_metric    // VRF instance (overload)
+#define ifr_vnetid ifr_ifru.ifru_vnetid       // Virtual Net Id
+#define ifr_ttl ifr_ifru.ifru_metric          // tunnel TTL (overload)
+#define ifr_data ifr_ifru.ifru_data           // for use by interface
+#define ifr_index ifr_ifru.ifru_index         // interface index
+#define ifr_llprio ifr_ifru.ifru_metric       // link layer priority
+#define ifr_hwaddr ifr_ifru.ifru_hwaddr       // MAC address
+    // clang-format on
+};
+
+__END_DECLS

Userland/Libraries/LibC/net/route.h

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2020, Marios Prokopakis <mariosprokopakis@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/socket.h>
+
+struct rtentry {
+    struct sockaddr rt_gateway; /* the gateway address */
+    struct sockaddr rt_genmask; /* the target network mask */
+    unsigned short int rt_flags;
+    char* rt_dev;
+    /* FIXME: complete the struct */
+};
+
+#define RTF_UP 0x1      /* do not delete the route */
+#define RTF_GATEWAY 0x2 /* the route is a gateway and not an end host */

Userland/Libraries/LibC/netdb.cpp

@@ -0,0 +1,590 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/Assertions.h>
+#include <AK/ByteBuffer.h>
+#include <AK/ScopeGuard.h>
+#include <AK/String.h>
+#include <Kernel/Net/IPv4.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+extern "C" {
+
+int h_errno;
+
+static hostent __gethostbyname_buffer;
+static in_addr_t __gethostbyname_address;
+static in_addr_t* __gethostbyname_address_list_buffer[2];
+
+static hostent __gethostbyaddr_buffer;
+static in_addr_t* __gethostbyaddr_address_list_buffer[2];
+
+// Get service entry buffers and file information for the getservent() family of functions.
+static FILE* services_file = nullptr;
+static const char* services_path = "/etc/services";
+
+static bool fill_getserv_buffers(const char* line, ssize_t read);
+static servent __getserv_buffer;
+static String __getserv_name_buffer;
+static String __getserv_protocol_buffer;
+static int __getserv_port_buffer;
+static Vector<ByteBuffer> __getserv_alias_list_buffer;
+static Vector<char*> __getserv_alias_list;
+static bool keep_service_file_open = false;
+static ssize_t service_file_offset = 0;
+
+// Get protocol entry buffers and file information for the getprotent() family of functions.
+static FILE* protocols_file = nullptr;
+static const char* protocols_path = "/etc/protocols";
+
+static bool fill_getproto_buffers(const char* line, ssize_t read);
+static protoent __getproto_buffer;
+static String __getproto_name_buffer;
+static Vector<ByteBuffer> __getproto_alias_list_buffer;
+static Vector<char*> __getproto_alias_list;
+static int __getproto_protocol_buffer;
+static bool keep_protocols_file_open = false;
+static ssize_t protocol_file_offset = 0;
+
+static int connect_to_lookup_server()
+{
+    int fd = socket(AF_LOCAL, SOCK_STREAM | SOCK_CLOEXEC, 0);
+    if (fd < 0) {
+        perror("socket");
+        return -1;
+    }
+
+    sockaddr_un address {
+        AF_LOCAL,
+        "/tmp/portal/lookup"
+    };
+
+    if (connect(fd, (const sockaddr*)&address, sizeof(address)) < 0) {
+        perror("connect_to_lookup_server");
+        close(fd);
+        return -1;
+    }
+    return fd;
+}
+
+static String gethostbyname_name_buffer;
+
+hostent* gethostbyname(const char* name)
+{
+    auto ipv4_address = IPv4Address::from_string(name);
+
+    if (ipv4_address.has_value()) {
+        gethostbyname_name_buffer = ipv4_address.value().to_string();
+        __gethostbyname_buffer.h_name = const_cast<char*>(gethostbyname_name_buffer.characters());
+        __gethostbyname_buffer.h_aliases = nullptr;
+        __gethostbyname_buffer.h_addrtype = AF_INET;
+        new (&__gethostbyname_address) IPv4Address(ipv4_address.value());
+        __gethostbyname_address_list_buffer[0] = &__gethostbyname_address;
+        __gethostbyname_address_list_buffer[1] = nullptr;
+        __gethostbyname_buffer.h_addr_list = (char**)__gethostbyname_address_list_buffer;
+        __gethostbyname_buffer.h_length = 4;
+
+        return &__gethostbyname_buffer;
+    }
+
+    int fd = connect_to_lookup_server();
+    if (fd < 0)
+        return nullptr;
+
+    auto close_fd_on_exit = ScopeGuard([fd] {
+        close(fd);
+    });
+
+    auto line = String::format("L%s\n", name);
+    int nsent = write(fd, line.characters(), line.length());
+    if (nsent < 0) {
+        perror("write");
+        return nullptr;
+    }
+
+    ASSERT((size_t)nsent == line.length());
+
+    char buffer[1024];
+    int nrecv = read(fd, buffer, sizeof(buffer) - 1);
+    if (nrecv < 0) {
+        perror("recv");
+        return nullptr;
+    }
+
+    if (!memcmp(buffer, "Not found.", sizeof("Not found.") - 1))
+        return nullptr;
+
+    auto responses = String(buffer, nrecv).split('\n');
+    if (responses.is_empty())
+        return nullptr;
+
+    auto& response = responses[0];
+
+    int rc = inet_pton(AF_INET, response.characters(), &__gethostbyname_address);
+    if (rc <= 0)
+        return nullptr;
+
+    gethostbyname_name_buffer = name;
+    __gethostbyname_buffer.h_name = const_cast<char*>(gethostbyname_name_buffer.characters());
+    __gethostbyname_buffer.h_aliases = nullptr;
+    __gethostbyname_buffer.h_addrtype = AF_INET;
+    __gethostbyname_address_list_buffer[0] = &__gethostbyname_address;
+    __gethostbyname_address_list_buffer[1] = nullptr;
+    __gethostbyname_buffer.h_addr_list = (char**)__gethostbyname_address_list_buffer;
+    __gethostbyname_buffer.h_length = 4;
+
+    return &__gethostbyname_buffer;
+}
+
+static String gethostbyaddr_name_buffer;
+
+hostent* gethostbyaddr(const void* addr, socklen_t addr_size, int type)
+{
+
+    if (type != AF_INET) {
+        errno = EAFNOSUPPORT;
+        return nullptr;
+    }
+
+    if (addr_size < sizeof(in_addr)) {
+        errno = EINVAL;
+        return nullptr;
+    }
+
+    int fd = connect_to_lookup_server();
+    if (fd < 0)
+        return nullptr;
+
+    auto close_fd_on_exit = ScopeGuard([fd] {
+        close(fd);
+    });
+
+    IPv4Address ipv4_address((const u8*)&((const in_addr*)addr)->s_addr);
+
+    auto line = String::format("R%d.%d.%d.%d.in-addr.arpa\n",
+        ipv4_address[3],
+        ipv4_address[2],
+        ipv4_address[1],
+        ipv4_address[0]);
+    int nsent = write(fd, line.characters(), line.length());
+    if (nsent < 0) {
+        perror("write");
+        return nullptr;
+    }
+
+    ASSERT((size_t)nsent == line.length());
+
+    char buffer[1024];
+    int nrecv = read(fd, buffer, sizeof(buffer) - 1);
+    if (nrecv < 0) {
+        perror("recv");
+        return nullptr;
+    }
+
+    if (!memcmp(buffer, "Not found.", sizeof("Not found.") - 1))
+        return nullptr;
+
+    auto responses = String(buffer, nrecv).split('\n');
+    if (responses.is_empty())
+        return nullptr;
+
+    gethostbyaddr_name_buffer = responses[0];
+    __gethostbyaddr_buffer.h_name = const_cast<char*>(gethostbyaddr_name_buffer.characters());
+    __gethostbyaddr_buffer.h_aliases = nullptr;
+    __gethostbyaddr_buffer.h_addrtype = AF_INET;
+    // FIXME: Should we populate the hostent's address list here with a sockaddr_in for the provided host?
+    __gethostbyaddr_address_list_buffer[0] = nullptr;
+    __gethostbyaddr_buffer.h_addr_list = (char**)__gethostbyaddr_address_list_buffer;
+    __gethostbyaddr_buffer.h_length = 4;
+
+    return &__gethostbyaddr_buffer;
+}
+
+struct servent* getservent()
+{
+    //If the services file is not open, attempt to open it and return null if it fails.
+    if (!services_file) {
+        services_file = fopen(services_path, "r");
+
+        if (!services_file) {
+            perror("error opening services file");
+            return nullptr;
+        }
+    }
+
+    if (fseek(services_file, service_file_offset, SEEK_SET) != 0) {
+        perror("error seeking file");
+        fclose(services_file);
+        return nullptr;
+    }
+    char* line = nullptr;
+    size_t len = 0;
+    ssize_t read;
+
+    auto free_line_on_exit = ScopeGuard([line] {
+        if (line) {
+            free(line);
+        }
+    });
+
+    // Read lines from services file until an actual service name is found.
+    do {
+        read = getline(&line, &len, services_file);
+        service_file_offset += read;
+        if (read > 0 && (line[0] >= 65 && line[0] <= 122)) {
+            break;
+        }
+    } while (read != -1);
+    if (read == -1) {
+        fclose(services_file);
+        services_file = nullptr;
+        service_file_offset = 0;
+        return nullptr;
+    }
+
+    servent* service_entry = nullptr;
+    if (!fill_getserv_buffers(line, read))
+        return nullptr;
+
+    __getserv_buffer.s_name = const_cast<char*>(__getserv_name_buffer.characters());
+    __getserv_buffer.s_port = __getserv_port_buffer;
+    __getserv_buffer.s_proto = const_cast<char*>(__getserv_protocol_buffer.characters());
+
+    __getserv_alias_list.clear_with_capacity();
+    __getserv_alias_list.ensure_capacity(__getserv_alias_list_buffer.size() + 1);
+    for (auto& alias : __getserv_alias_list_buffer)
+        __getserv_alias_list.unchecked_append(reinterpret_cast<char*>(alias.data()));
+    __getserv_alias_list.unchecked_append(nullptr);
+
+    __getserv_buffer.s_aliases = __getserv_alias_list.data();
+    service_entry = &__getserv_buffer;
+
+    if (!keep_service_file_open) {
+        endservent();
+    }
+    return service_entry;
+}
+
+struct servent* getservbyname(const char* name, const char* protocol)
+{
+    bool previous_file_open_setting = keep_service_file_open;
+    setservent(1);
+    struct servent* current_service = nullptr;
+    auto service_file_handler = ScopeGuard([previous_file_open_setting] {
+        if (!previous_file_open_setting) {
+            endservent();
+        }
+    });
+
+    while (true) {
+        current_service = getservent();
+        if (current_service == nullptr)
+            break;
+        else if (!protocol && strcmp(current_service->s_name, name) == 0)
+            break;
+        else if (strcmp(current_service->s_name, name) == 0 && strcmp(current_service->s_proto, protocol) == 0)
+            break;
+    }
+
+    return current_service;
+}
+
+struct servent* getservbyport(int port, const char* protocol)
+{
+    bool previous_file_open_setting = keep_service_file_open;
+    setservent(1);
+    struct servent* current_service = nullptr;
+    auto service_file_handler = ScopeGuard([previous_file_open_setting] {
+        if (!previous_file_open_setting) {
+            endservent();
+        }
+    });
+    while (true) {
+        current_service = getservent();
+        if (current_service == nullptr)
+            break;
+        else if (!protocol && current_service->s_port == port)
+            break;
+        else if (current_service->s_port == port && (strcmp(current_service->s_proto, protocol) == 0))
+            break;
+    }
+
+    return current_service;
+}
+
+void setservent(int stay_open)
+{
+    if (!services_file) {
+        services_file = fopen(services_path, "r");
+
+        if (!services_file) {
+            perror("error opening services file");
+            return;
+        }
+    }
+    rewind(services_file);
+    keep_service_file_open = stay_open;
+    service_file_offset = 0;
+}
+
+void endservent()
+{
+    if (!services_file) {
+        return;
+    }
+    fclose(services_file);
+    services_file = nullptr;
+}
+
+// Fill the service entry buffer with the information contained
+// in the currently read line, returns true if successful,
+// false if failure occurs.
+static bool fill_getserv_buffers(const char* line, ssize_t read)
+{
+    //Splitting the line by tab delimiter and filling the servent buffers name, port, and protocol members.
+    String string_line = String(line, read);
+    string_line.replace(" ", "\t", true);
+    auto split_line = string_line.split('\t');
+
+    // This indicates an incorrect file format.
+    // Services file entries should always at least contain
+    // name and port/protocol, separated by tabs.
+    if (split_line.size() < 2) {
+        fprintf(stderr, "getservent(): malformed services file\n");
+        return false;
+    }
+    __getserv_name_buffer = split_line[0];
+
+    auto port_protocol_split = String(split_line[1]).split('/');
+    if (port_protocol_split.size() < 2) {
+        fprintf(stderr, "getservent(): malformed services file\n");
+        return false;
+    }
+    auto number = port_protocol_split[0].to_int();
+    if (!number.has_value())
+        return false;
+
+    __getserv_port_buffer = number.value();
+
+    // Remove any annoying whitespace at the end of the protocol.
+    port_protocol_split[1].replace(" ", "", true);
+    port_protocol_split[1].replace("\t", "", true);
+    port_protocol_split[1].replace("\n", "", true);
+
+    __getserv_protocol_buffer = port_protocol_split[1];
+    __getserv_alias_list_buffer.clear();
+
+    // If there are aliases for the service, we will fill the alias list buffer.
+    if (split_line.size() > 2 && !split_line[2].starts_with('#')) {
+
+        for (size_t i = 2; i < split_line.size(); i++) {
+            if (split_line[i].starts_with('#')) {
+                break;
+            }
+            auto alias = split_line[i].to_byte_buffer();
+            alias.append("\0", sizeof(char));
+            __getserv_alias_list_buffer.append(alias);
+        }
+    }
+
+    return true;
+}
+
+struct protoent* getprotoent()
+{
+    // If protocols file isn't open, attempt to open and return null on failure.
+    if (!protocols_file) {
+        protocols_file = fopen(protocols_path, "r");
+
+        if (!protocols_file) {
+            perror("error opening protocols file");
+            return nullptr;
+        }
+    }
+
+    if (fseek(protocols_file, protocol_file_offset, SEEK_SET) != 0) {
+        perror("error seeking protocols file");
+        fclose(protocols_file);
+        return nullptr;
+    }
+
+    char* line = nullptr;
+    size_t len = 0;
+    ssize_t read;
+
+    auto free_line_on_exit = ScopeGuard([line] {
+        if (line) {
+            free(line);
+        }
+    });
+
+    do {
+        read = getline(&line, &len, protocols_file);
+        protocol_file_offset += read;
+        if (read > 0 && (line[0] >= 65 && line[0] <= 122)) {
+            break;
+        }
+    } while (read != -1);
+
+    if (read == -1) {
+        fclose(protocols_file);
+        protocols_file = nullptr;
+        protocol_file_offset = 0;
+        return nullptr;
+    }
+
+    struct protoent* protocol_entry = nullptr;
+    if (!fill_getproto_buffers(line, read))
+        return nullptr;
+
+    __getproto_buffer.p_name = const_cast<char*>(__getproto_name_buffer.characters());
+    __getproto_buffer.p_proto = __getproto_protocol_buffer;
+
+    __getproto_alias_list.clear_with_capacity();
+    __getproto_alias_list.ensure_capacity(__getproto_alias_list_buffer.size() + 1);
+    for (auto& alias : __getproto_alias_list_buffer)
+        __getproto_alias_list.unchecked_append(reinterpret_cast<char*>(alias.data()));
+    __getserv_alias_list.unchecked_append(nullptr);
+
+    __getproto_buffer.p_aliases = __getproto_alias_list.data();
+    protocol_entry = &__getproto_buffer;
+
+    if (!keep_protocols_file_open)
+        endprotoent();
+
+    return protocol_entry;
+}
+
+struct protoent* getprotobyname(const char* name)
+{
+    bool previous_file_open_setting = keep_protocols_file_open;
+    setprotoent(1);
+    struct protoent* current_protocol = nullptr;
+    auto protocol_file_handler = ScopeGuard([previous_file_open_setting] {
+        if (!previous_file_open_setting) {
+            endprotoent();
+        }
+    });
+
+    while (true) {
+        current_protocol = getprotoent();
+        if (current_protocol == nullptr)
+            break;
+        else if (strcmp(current_protocol->p_name, name) == 0)
+            break;
+    }
+
+    return current_protocol;
+}
+
+struct protoent* getprotobynumber(int proto)
+{
+    bool previous_file_open_setting = keep_protocols_file_open;
+    setprotoent(1);
+    struct protoent* current_protocol = nullptr;
+    auto protocol_file_handler = ScopeGuard([previous_file_open_setting] {
+        if (!previous_file_open_setting) {
+            endprotoent();
+        }
+    });
+
+    while (true) {
+        current_protocol = getprotoent();
+        if (current_protocol == nullptr)
+            break;
+        else if (current_protocol->p_proto == proto)
+            break;
+    }
+
+    return current_protocol;
+}
+
+void setprotoent(int stay_open)
+{
+    if (!protocols_file) {
+        protocols_file = fopen(protocols_path, "r");
+
+        if (!protocols_file) {
+            perror("setprotoent(): error opening protocols file");
+            return;
+        }
+    }
+    rewind(protocols_file);
+    keep_protocols_file_open = stay_open;
+    protocol_file_offset = 0;
+}
+
+void endprotoent()
+{
+    if (!protocols_file) {
+        return;
+    }
+    fclose(protocols_file);
+    protocols_file = nullptr;
+}
+
+static bool fill_getproto_buffers(const char* line, ssize_t read)
+{
+    String string_line = String(line, read);
+    string_line.replace(" ", "\t", true);
+    auto split_line = string_line.split('\t');
+
+    // This indicates an incorrect file format. Protocols file entries should
+    // always have at least a name and a protocol.
+    if (split_line.size() < 2) {
+        fprintf(stderr, "getprotoent(): malformed protocols file\n");
+        return false;
+    }
+    __getproto_name_buffer = split_line[0];
+
+    auto number = split_line[1].to_int();
+    if (!number.has_value())
+        return false;
+
+    __getproto_protocol_buffer = number.value();
+
+    __getproto_alias_list_buffer.clear();
+
+    // If there are aliases for the protocol, we will fill the alias list buffer.
+    if (split_line.size() > 2 && !split_line[2].starts_with('#')) {
+
+        for (size_t i = 2; i < split_line.size(); i++) {
+            if (split_line[i].starts_with('#'))
+                break;
+            auto alias = split_line[i].to_byte_buffer();
+            alias.append("\0", sizeof(char));
+            __getproto_alias_list_buffer.append(alias);
+        }
+    }
+
+    return true;
+}
+}

Userland/Libraries/LibC/netdb.h

@@ -0,0 +1,78 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+struct hostent {
+    char* h_name;
+    char** h_aliases;
+    int h_addrtype;
+    int h_length;
+    char** h_addr_list;
+#define h_addr h_addr_list[0]
+};
+
+struct hostent* gethostbyname(const char*);
+struct hostent* gethostbyaddr(const void* addr, socklen_t len, int type);
+
+struct servent {
+    char* s_name;
+    char** s_aliases;
+    int s_port;
+    char* s_proto;
+};
+
+struct servent* getservent();
+struct servent* getservbyname(const char* name, const char* protocol);
+struct servent* getservbyport(int port, const char* protocol);
+void setservent(int stay_open);
+void endservent();
+
+struct protoent {
+    char* p_name;
+    char** p_aliases;
+    int p_proto;
+};
+
+void endprotoent();
+struct protoent* getprotobyname(const char* name);
+struct protoent* getprotobynumber(int proto);
+struct protoent* getprotoent();
+void setprotoent(int stay_open);
+
+extern int h_errno;
+
+#define HOST_NOT_FOUND 101
+#define NO_DATA 102
+#define NO_RECOVERY 103
+#define TRY_AGAIN 104
+
+__END_DECLS

Userland/Libraries/LibC/netinet/in.h

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <bits/stdint.h>
+#include <sys/cdefs.h>
+#include <sys/socket.h>
+
+__BEGIN_DECLS
+
+typedef uint32_t in_addr_t;
+in_addr_t inet_addr(const char*);
+
+#define INADDR_ANY ((in_addr_t)0)
+#define INADDR_NONE ((in_addr_t)-1)
+#define INADDR_LOOPBACK 0x7f000001
+
+#define IN_LOOPBACKNET 127
+
+#define IP_TTL 2
+
+#define IPPORT_RESERVED 1024
+#define IPPORT_USERRESERVED 5000
+
+typedef uint16_t in_port_t;
+
+struct in_addr {
+    uint32_t s_addr;
+};
+
+struct sockaddr_in {
+    sa_family_t sin_family;
+    in_port_t sin_port;
+    struct in_addr sin_addr;
+    char sin_zero[8];
+};
+
+struct in6_addr {
+    uint8_t s6_addr[16];
+};
+
+struct sockaddr_in6 {
+    sa_family_t sin6_family;   // AF_INET6.
+    in_port_t sin6_port;       // Port number.
+    uint32_t sin6_flowinfo;    // IPv6 traffic class and flow information.
+    struct in6_addr sin6_addr; // IPv6 address.
+    uint32_t sin6_scope_id;    // Set of interfaces for a scop
+};
+
+__END_DECLS

Userland/Libraries/LibC/netinet/ip.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include "in.h"

Userland/Libraries/LibC/netinet/ip_icmp.h

@@ -0,0 +1,47 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <bits/stdint.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+struct icmphdr {
+    uint8_t type;
+    uint8_t code;
+    uint16_t checksum;
+    union {
+        struct {
+            uint16_t id;
+            uint16_t sequence;
+        } echo;
+        uint32_t gateway;
+    } un;
+};
+
+__END_DECLS

Userland/Libraries/LibC/netinet/tcp.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2020, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#define TCP_NODELAY 10

Userland/Libraries/LibC/paths.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2020, The SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+// FIXME: This is just a default value to satisfy OpenSSH, feel free to change it.
+#define _PATH_MAILDIR "/var/mail"

Userland/Libraries/LibC/poll.cpp

@@ -0,0 +1,51 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/API/Syscall.h>
+#include <errno.h>
+#include <poll.h>
+#include <sys/time.h>
+
+extern "C" {
+
+int poll(pollfd* fds, nfds_t nfds, int timeout_ms)
+{
+    timespec timeout;
+    timespec* timeout_ts = &timeout;
+    if (timeout_ms < 0)
+        timeout_ts = nullptr;
+    else
+        timeout = { timeout_ms / 1000, (timeout_ms % 1000) * 1'000'000 };
+    return ppoll(fds, nfds, timeout_ts, nullptr);
+}
+
+int ppoll(pollfd* fds, nfds_t nfds, const timespec* timeout, const sigset_t* sigmask)
+{
+    Syscall::SC_poll_params params { fds, nfds, timeout, sigmask };
+    int rc = syscall(SC_poll, &params);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+}

Userland/Libraries/LibC/poll.h

@@ -0,0 +1,53 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <signal.h>
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#define POLLIN (1u << 0)
+#define POLLPRI (1u << 1)
+#define POLLOUT (1u << 2)
+#define POLLERR (1u << 3)
+#define POLLHUP (1u << 4)
+#define POLLNVAL (1u << 5)
+#define POLLRDHUP (1u << 13)
+
+struct pollfd {
+    int fd;
+    short events;
+    short revents;
+};
+
+typedef unsigned nfds_t;
+
+int poll(struct pollfd* fds, nfds_t nfds, int timeout);
+int ppoll(struct pollfd* fds, nfds_t nfds, const struct timespec* timeout, const sigset_t* sigmask);
+
+__END_DECLS

Userland/Libraries/LibC/pwd.cpp

@@ -0,0 +1,189 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/String.h>
+#include <AK/Vector.h>
+#include <errno_numbers.h>
+#include <pwd.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+
+extern "C" {
+
+static FILE* s_stream = nullptr;
+static unsigned s_line_number = 0;
+static struct passwd s_passwd_entry;
+
+static String s_name;
+static String s_passwd;
+static String s_gecos;
+static String s_dir;
+static String s_shell;
+
+void setpwent()
+{
+    s_line_number = 0;
+    if (s_stream) {
+        rewind(s_stream);
+    } else {
+        s_stream = fopen("/etc/passwd", "r");
+        if (!s_stream) {
+            perror("open /etc/passwd");
+        }
+    }
+}
+
+void endpwent()
+{
+    s_line_number = 0;
+    if (s_stream) {
+        fclose(s_stream);
+        s_stream = nullptr;
+    }
+
+    memset(&s_passwd_entry, 0, sizeof(s_passwd_entry));
+
+    s_name = {};
+    s_passwd = {};
+    s_gecos = {};
+    s_dir = {};
+    s_shell = {};
+}
+
+struct passwd* getpwuid(uid_t uid)
+{
+    setpwent();
+    while (auto* pw = getpwent()) {
+        if (pw->pw_uid == uid)
+            return pw;
+    }
+    return nullptr;
+}
+
+struct passwd* getpwnam(const char* name)
+{
+    setpwent();
+    while (auto* pw = getpwent()) {
+        if (!strcmp(pw->pw_name, name))
+            return pw;
+    }
+    return nullptr;
+}
+
+static bool parse_pwddb_entry(const String& line)
+{
+    auto parts = line.split_view(':', true);
+    if (parts.size() != 7) {
+        fprintf(stderr, "getpwent(): Malformed entry on line %u\n", s_line_number);
+        return false;
+    }
+
+    s_name = parts[0];
+    s_passwd = parts[1];
+    auto& uid_string = parts[2];
+    auto& gid_string = parts[3];
+    s_gecos = parts[4];
+    s_dir = parts[5];
+    s_shell = parts[6];
+
+    auto uid = uid_string.to_uint();
+    if (!uid.has_value()) {
+        fprintf(stderr, "getpwent(): Malformed UID on line %u\n", s_line_number);
+        return false;
+    }
+    auto gid = gid_string.to_uint();
+    if (!gid.has_value()) {
+        fprintf(stderr, "getpwent(): Malformed GID on line %u\n", s_line_number);
+        return false;
+    }
+
+    s_passwd_entry.pw_name = const_cast<char*>(s_name.characters());
+    s_passwd_entry.pw_passwd = const_cast<char*>(s_passwd.characters());
+    s_passwd_entry.pw_uid = uid.value();
+    s_passwd_entry.pw_gid = gid.value();
+    s_passwd_entry.pw_gecos = const_cast<char*>(s_gecos.characters());
+    s_passwd_entry.pw_dir = const_cast<char*>(s_dir.characters());
+    s_passwd_entry.pw_shell = const_cast<char*>(s_shell.characters());
+
+    return true;
+}
+
+struct passwd* getpwent()
+{
+    if (!s_stream)
+        setpwent();
+
+    while (true) {
+        if (!s_stream || feof(s_stream))
+            return nullptr;
+
+        if (ferror(s_stream)) {
+            fprintf(stderr, "getpwent(): Read error: %s\n", strerror(ferror(s_stream)));
+            return nullptr;
+        }
+
+        char buffer[1024];
+        ++s_line_number;
+        char* s = fgets(buffer, sizeof(buffer), s_stream);
+
+        // Silently tolerate an empty line at the end.
+        if ((!s || !s[0]) && feof(s_stream))
+            return nullptr;
+
+        String line(s, Chomp);
+        if (parse_pwddb_entry(line))
+            return &s_passwd_entry;
+        // Otherwise, proceed to the next line.
+    }
+}
+
+int putpwent(const struct passwd* p, FILE* stream)
+{
+    if (!p || !stream || !p->pw_passwd || !p->pw_name || !p->pw_dir || !p->pw_gecos || !p->pw_shell) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    auto is_valid_field = [](const char* str) {
+        return str && !strpbrk(str, ":\n");
+    };
+
+    if (!is_valid_field(p->pw_name) || !is_valid_field(p->pw_dir) || !is_valid_field(p->pw_gecos) || !is_valid_field(p->pw_shell)) {
+        errno = EINVAL;
+        return -1;
+    }
+
+    int nwritten = fprintf(stream, "%s:%s:%u:%u:%s,,,:%s:%s\n", p->pw_name, p->pw_passwd, p->pw_uid, p->pw_gid, p->pw_gecos, p->pw_dir, p->pw_shell);
+    if (!nwritten || nwritten < 0) {
+        errno = ferror(stream);
+        return -1;
+    }
+
+    return 0;
+}
+}

Userland/Libraries/LibC/pwd.h

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <bits/FILE.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+struct passwd {
+    char* pw_name;
+    char* pw_passwd;
+    uid_t pw_uid;
+    gid_t pw_gid;
+    char* pw_gecos;
+    char* pw_dir;
+    char* pw_shell;
+};
+
+struct passwd* getpwent();
+void setpwent();
+void endpwent();
+struct passwd* getpwnam(const char* name);
+struct passwd* getpwuid(uid_t);
+int putpwent(const struct passwd* p, FILE* stream);
+
+__END_DECLS

Userland/Libraries/LibC/qsort.cpp

@@ -0,0 +1,102 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/Assertions.h>
+#include <AK/QuickSort.h>
+#include <stdlib.h>
+#include <sys/types.h>
+
+class SizedObject {
+public:
+    SizedObject() = delete;
+    SizedObject(void* data, size_t size)
+        : m_data(data)
+        , m_size(size)
+    {
+    }
+    void* data() const { return m_data; }
+    size_t size() const { return m_size; }
+
+private:
+    void* m_data;
+    size_t m_size;
+};
+
+namespace AK {
+
+template<>
+inline void swap(const SizedObject& a, const SizedObject& b)
+{
+    ASSERT(a.size() == b.size());
+    const size_t size = a.size();
+    const auto a_data = reinterpret_cast<char*>(a.data());
+    const auto b_data = reinterpret_cast<char*>(b.data());
+    for (auto i = 0u; i < size; ++i) {
+        swap(a_data[i], b_data[i]);
+    }
+}
+
+}
+
+class SizedObjectSlice {
+public:
+    SizedObjectSlice() = delete;
+    SizedObjectSlice(void* data, size_t element_size)
+        : m_data(data)
+        , m_element_size(element_size)
+    {
+    }
+    const SizedObject operator[](size_t index)
+    {
+        return { static_cast<char*>(m_data) + index * m_element_size, m_element_size };
+    }
+
+private:
+    void* m_data;
+    size_t m_element_size;
+};
+
+void qsort(void* bot, size_t nmemb, size_t size, int (*compar)(const void*, const void*))
+{
+    if (nmemb <= 1) {
+        return;
+    }
+
+    SizedObjectSlice slice { bot, size };
+
+    AK::dual_pivot_quick_sort(slice, 0, nmemb - 1, [=](const SizedObject& a, const SizedObject& b) { return compar(a.data(), b.data()) < 0; });
+}
+
+void qsort_r(void* bot, size_t nmemb, size_t size, int (*compar)(const void*, const void*, void*), void* arg)
+{
+    if (nmemb <= 1) {
+        return;
+    }
+
+    SizedObjectSlice slice { bot, size };
+
+    AK::dual_pivot_quick_sort(slice, 0, nmemb - 1, [=](const SizedObject& a, const SizedObject& b) { return compar(a.data(), b.data(), arg) < 0; });
+}

Userland/Libraries/LibC/regex.h

@@ -0,0 +1,125 @@
+/*
+ * Copyright (c) 2020, Emanuel Sprung <emanuel.sprung@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <stddef.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+typedef ssize_t regoff_t;
+
+struct regex_t {
+    void* __data;
+};
+
+enum __Regex_Error {
+    __Regex_NoError,
+    __Regex_InvalidPattern,             // Invalid regular expression.
+    __Regex_InvalidCollationElement,    // Invalid collating element referenced.
+    __Regex_InvalidCharacterClass,      // Invalid character class type referenced.
+    __Regex_InvalidTrailingEscape,      // Trailing \ in pattern.
+    __Regex_InvalidNumber,              // Number in \digit invalid or in error.
+    __Regex_MismatchingBracket,         // [ ] imbalance.
+    __Regex_MismatchingParen,           // ( ) imbalance.
+    __Regex_MismatchingBrace,           // { } imbalance.
+    __Regex_InvalidBraceContent,        // Content of {} invalid: not a number, number too large, more than two numbers, first larger than second.
+    __Regex_InvalidBracketContent,      // Content of [] invalid.
+    __Regex_InvalidRange,               // Invalid endpoint in range expression.
+    __Regex_InvalidRepetitionMarker,    // ?, * or + not preceded by valid regular expression.
+    __Regex_ReachedMaxRecursion,        // MaximumRecursion has been reached.
+    __Regex_EmptySubExpression,         // Sub expression has empty content.
+    __Regex_InvalidCaptureGroup,        // Content of capture group is invalid.
+    __Regex_InvalidNameForCaptureGroup, // Name of capture group is invalid.
+};
+
+enum ReError {
+    REG_NOERR = __Regex_NoError,
+    REG_BADPAT = __Regex_InvalidPattern,            // Invalid regular expression.
+    REG_ECOLLATE = __Regex_InvalidCollationElement, // Invalid collating element referenced.
+    REG_ECTYPE = __Regex_InvalidCharacterClass,     // Invalid character class type referenced.
+    REG_EESCAPE = __Regex_InvalidTrailingEscape,    // Trailing \ in pattern.
+    REG_ESUBREG = __Regex_InvalidNumber,            // Number in \digit invalid or in error.
+    REG_EBRACK = __Regex_MismatchingBracket,        // [ ] imbalance.
+    REG_EPAREN = __Regex_MismatchingParen,          // \( \) or ( ) imbalance.
+    REG_EBRACE = __Regex_MismatchingBrace,          // \{ \} imbalance.
+    REG_BADBR = __Regex_InvalidBraceContent,        // Content of \{ \} invalid: not a number, number too large, more than two numbers, first larger than second.
+    REG_ERANGE = __Regex_InvalidRange,              // Invalid endpoint in range expression.
+    REG_BADRPT = __Regex_InvalidRepetitionMarker,   // ?, * or + not preceded by valid regular expression.
+    REG_EMPTY_EXPR = __Regex_EmptySubExpression,    // Empty expression
+    REG_ENOSYS,                                     // The implementation does not support the function.
+    REG_ESPACE,                                     // Out of memory.
+    REG_NOMATCH,                                    // regexec() failed to match.
+};
+
+struct regmatch_t {
+    regoff_t rm_so;  // byte offset from start of string to start of substring
+    regoff_t rm_eo;  // byte offset from start of string of the first character after the end of substring
+    regoff_t rm_cnt; // number of matches
+};
+
+enum __RegexAllFlags {
+    __Regex_Global = 1,                                  // All matches (don't return after first match)
+    __Regex_Insensitive = __Regex_Global << 1,           // Case insensitive match (ignores case of [a-zA-Z])
+    __Regex_Ungreedy = __Regex_Global << 2,              // The match becomes lazy by default. Now a ? following a quantifier makes it greedy
+    __Regex_Unicode = __Regex_Global << 3,               // Enable all unicode features and interpret all unicode escape sequences as such
+    __Regex_Extended = __Regex_Global << 4,              // Ignore whitespaces. Spaces and text after a # in the pattern are ignored
+    __Regex_Extra = __Regex_Global << 5,                 // Disallow meaningless escapes. A \ followed by a letter with no special meaning is faulted
+    __Regex_MatchNotBeginOfLine = __Regex_Global << 6,   // Pattern is not forced to ^ -> search in whole string!
+    __Regex_MatchNotEndOfLine = __Regex_Global << 7,     // Don't Force the dollar sign, $, to always match end of the string, instead of end of the line. This option is ignored if the Multiline-flag is set
+    __Regex_SkipSubExprResults = __Regex_Global << 8,    // Do not return sub expressions in the result
+    __Regex_StringCopyMatches = __Regex_Global << 9,     // Do explicitly copy results into new allocated string instead of StringView to original string.
+    __Regex_SingleLine = __Regex_Global << 10,           // Dot matches newline characters
+    __Regex_Sticky = __Regex_Global << 11,               // Force the pattern to only match consecutive matches from where the previous match ended.
+    __Regex_Multiline = __Regex_Global << 12,            // Handle newline characters. Match each line, one by one.
+    __Regex_SkipTrimEmptyMatches = __Regex_Global << 13, // Do not remove empty capture group results.
+    __Regex_Internal_Stateful = __Regex_Global << 14,    // Internal flag; enables stateful matches.
+    __Regex_Last = __Regex_SkipTrimEmptyMatches
+};
+
+// clang-format off
+// Values for the cflags parameter to the regcomp() function:
+#define REG_EXTENDED __Regex_Extended                // Use Extended Regular Expressions.
+#define REG_ICASE __Regex_Insensitive                // Ignore case in match.
+#define REG_NOSUB __Regex_SkipSubExprResults         // Report only success or fail in regexec().
+#define REG_GLOBAL __Regex_Global                    // Don't stop searching for more match
+#define REG_NEWLINE (__Regex_Multiline | REG_GLOBAL) // Change the handling of newline.
+
+// Values for the eflags parameter to the regexec() function:
+#define REG_NOTBOL __Regex_MatchNotBeginOfLine // The circumflex character (^), when taken as a special character, will not match the beginning of string.
+#define REG_NOTEOL __Regex_MatchNotEndOfLine   // The dollar sign ($), when taken as a special character, will not match the end of string.
+
+//static_assert (sizeof(FlagsUnderlyingType) * 8 >= regex::POSIXFlags::Last << 1), "flags type too small")
+#define REG_SEARCH __Regex_Last << 1
+// clang-format on
+
+int regcomp(regex_t*, const char*, int);
+int regexec(const regex_t*, const char*, size_t, regmatch_t[], int);
+size_t regerror(int, const regex_t*, char*, size_t);
+void regfree(regex_t*);
+
+__END_DECLS

Userland/Libraries/LibC/scanf.cpp

@@ -0,0 +1,227 @@
+/*
+ * Copyright (c) 2000-2002 Opsycon AB  (www.opsycon.se)
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *    This product includes software developed by Opsycon AB.
+ * 4. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS
+ * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ */
+#include <AK/Assertions.h>
+#include <ctype.h>
+#include <stdarg.h>
+#include <stdint.h>
+#include <stdio.h>
+#include <string.h>
+
+static const char* determine_base(const char* p, int& base)
+{
+    if (p[0] == '0') {
+        switch (p[1]) {
+        case 'x':
+            base = 16;
+            break;
+        case 't':
+        case 'n':
+            base = 10;
+            break;
+        case 'o':
+            base = 8;
+            break;
+        default:
+            base = 10;
+            return p;
+        }
+        return p + 2;
+    }
+    base = 10;
+    return p;
+}
+
+static int _atob(unsigned long* vp, const char* p, int base)
+{
+    unsigned long value, v1, v2;
+    const char* q;
+    char tmp[20];
+    int digit;
+
+    if (p[0] == '0' && (p[1] == 'x' || p[1] == 'X')) {
+        base = 16;
+        p += 2;
+    }
+
+    if (base == 16 && (q = strchr(p, '.')) != 0) {
+        if (q - p > (ssize_t)sizeof(tmp) - 1)
+            return 0;
+        memcpy(tmp, p, q - p);
+        tmp[q - p] = '\0';
+
+        if (!_atob(&v1, tmp, 16))
+            return 0;
+        ++q;
+        if (strchr(q, '.'))
+            return 0;
+        if (!_atob(&v2, q, 16))
+            return 0;
+        *vp = (v1 << 16) + v2;
+        return 1;
+    }
+
+    value = *vp = 0;
+    for (; *p; p++) {
+        if (*p >= '0' && *p <= '9')
+            digit = *p - '0';
+        else if (*p >= 'a' && *p <= 'f')
+            digit = *p - 'a' + 10;
+        else if (*p >= 'A' && *p <= 'F')
+            digit = *p - 'A' + 10;
+        else
+            return 0;
+
+        if (digit >= base)
+            return 0;
+        value *= base;
+        value += digit;
+    }
+    *vp = value;
+    return 1;
+}
+
+static int atob(unsigned int* vp, const char* p, int base)
+{
+    unsigned long v;
+
+    if (base == 0)
+        p = determine_base(p, base);
+    if (_atob(&v, p, base)) {
+        *vp = v;
+        return 1;
+    }
+    return 0;
+}
+
+#define ISSPACE " \t\n\r\f\v"
+
+int vsscanf(const char* buf, const char* s, va_list ap)
+{
+    int base = 10;
+    char* t;
+    char tmp[BUFSIZ];
+    bool noassign = false;
+    int count = 0;
+    int width = 0;
+
+    // FIXME: This doesn't work quite right. For example, it fails to match 'SSH-2.0-OpenSSH_8.2p1 Ubuntu-4ubuntu0.1\r\n'
+    //        with 'SSH-%d.%d-%[^\n]\n'
+
+    while (*s && *buf) {
+        while (isspace(*s))
+            s++;
+        if (*s == '%') {
+            s++;
+            for (; *s; s++) {
+                if (strchr("dibouxcsefg%", *s))
+                    break;
+                if (*s == '*')
+                    noassign = true;
+                else if (*s >= '1' && *s <= '9') {
+                    const char* tc;
+                    for (tc = s; isdigit(*s); s++)
+                        ;
+                    ASSERT((ssize_t)sizeof(tmp) >= s - tc + 1);
+                    memcpy(tmp, tc, s - tc);
+                    tmp[s - tc] = '\0';
+                    atob((uint32_t*)&width, tmp, 10);
+                    s--;
+                }
+            }
+            if (*s == 's') {
+                while (isspace(*buf))
+                    buf++;
+                if (!width)
+                    width = strcspn(buf, ISSPACE);
+                if (!noassign) {
+                    // In this case, we have no way to ensure the user buffer is not overflown :(
+                    memcpy(t = va_arg(ap, char*), buf, width);
+                    t[width] = '\0';
+                }
+                buf += width;
+            } else if (*s == 'c') {
+                if (!width)
+                    width = 1;
+                if (!noassign) {
+                    memcpy(t = va_arg(ap, char*), buf, width);
+                    // No null terminator!
+                }
+                buf += width;
+            } else if (strchr("dobxu", *s)) {
+                while (isspace(*buf))
+                    buf++;
+                if (*s == 'd' || *s == 'u')
+                    base = 10;
+                else if (*s == 'x')
+                    base = 16;
+                else if (*s == 'o')
+                    base = 8;
+                else if (*s == 'b')
+                    base = 2;
+                if (!width) {
+                    if (isspace(*(s + 1)) || *(s + 1) == 0) {
+                        width = strcspn(buf, ISSPACE);
+                    } else {
+                        auto* p = strchr(buf, *(s + 1));
+                        if (p)
+                            width = p - buf;
+                        else {
+                            noassign = true;
+                            width = 0;
+                        }
+                    }
+                }
+                memcpy(tmp, buf, width);
+                tmp[width] = '\0';
+                buf += width;
+                if (!noassign) {
+                    if (!atob(va_arg(ap, uint32_t*), tmp, base))
+                        noassign = true;
+                }
+            }
+            if (!noassign)
+                ++count;
+            width = 0;
+            noassign = false;
+            ++s;
+        } else {
+            while (isspace(*buf))
+                buf++;
+            if (*s != *buf)
+                break;
+            else {
+                ++s;
+                ++buf;
+            }
+        }
+    }
+    return count;
+}

Userland/Libraries/LibC/sched.cpp

@@ -0,0 +1,60 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/API/Syscall.h>
+#include <errno.h>
+#include <sched.h>
+
+extern "C" {
+
+int sched_yield()
+{
+    int rc = syscall(SC_yield);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int sched_get_priority_min([[maybe_unused]] int policy)
+{
+    return 0; // Idle
+}
+
+int sched_get_priority_max([[maybe_unused]] int policy)
+{
+    return 3; // High
+}
+
+int sched_setparam(pid_t pid, const struct sched_param* param)
+{
+    int rc = syscall(SC_sched_setparam, pid, param);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int sched_getparam(pid_t pid, struct sched_param* param)
+{
+    int rc = syscall(SC_sched_getparam, pid, param);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+}

Userland/Libraries/LibC/sched.h

@@ -0,0 +1,50 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+int sched_yield();
+
+struct sched_param {
+    int sched_priority;
+};
+
+#define SCHED_FIFO 0
+#define SCHED_RR 1
+#define SCHED_OTHER 2
+#define SCHED_BATCH 3
+
+int sched_get_priority_min(int policy);
+int sched_get_priority_max(int policy);
+int sched_setparam(pid_t pid, const struct sched_param* param);
+int sched_getparam(pid_t pid, struct sched_param* param);
+
+__END_DECLS

Userland/Libraries/LibC/serenity.cpp

@@ -0,0 +1,139 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/API/Syscall.h>
+#include <errno.h>
+#include <serenity.h>
+
+extern "C" {
+
+int disown(pid_t pid)
+{
+    int rc = syscall(SC_disown, pid);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int module_load(const char* path, size_t path_length)
+{
+    int rc = syscall(SC_module_load, path, path_length);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int module_unload(const char* name, size_t name_length)
+{
+    int rc = syscall(SC_module_unload, name, name_length);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int profiling_enable(pid_t pid)
+{
+    int rc = syscall(SC_profiling_enable, pid);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int profiling_disable(pid_t pid)
+{
+    int rc = syscall(SC_profiling_disable, pid);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int set_thread_boost(pid_t tid, int amount)
+{
+    int rc = syscall(SC_set_thread_boost, tid, amount);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int set_process_boost(pid_t tid, int amount)
+{
+    int rc = syscall(SC_set_process_boost, tid, amount);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int futex(int32_t* userspace_address, int futex_op, int32_t value, const struct timespec* timeout)
+{
+    Syscall::SC_futex_params params { userspace_address, futex_op, value, timeout };
+    int rc = syscall(SC_futex, &params);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int purge(int mode)
+{
+    int rc = syscall(SC_purge, mode);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int perf_event(int type, uintptr_t arg1, FlatPtr arg2)
+{
+    int rc = syscall(SC_perf_event, type, arg1, arg2);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+void* shbuf_get(int shbuf_id, size_t* size)
+{
+    ssize_t rc = syscall(SC_shbuf_get, shbuf_id, size);
+    if (rc < 0 && -rc < EMAXERRNO) {
+        errno = -rc;
+        return (void*)-1;
+    }
+    return (void*)rc;
+}
+
+int shbuf_release(int shbuf_id)
+{
+    int rc = syscall(SC_shbuf_release, shbuf_id);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int shbuf_seal(int shbuf_id)
+{
+    int rc = syscall(SC_shbuf_seal, shbuf_id);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int shbuf_create(int size, void** buffer)
+{
+    int rc = syscall(SC_shbuf_create, size, buffer);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int shbuf_allow_pid(int shbuf_id, pid_t peer_pid)
+{
+    int rc = syscall(SC_shbuf_allow_pid, shbuf_id, peer_pid);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int shbuf_allow_all(int shbuf_id)
+{
+    int rc = syscall(SC_shbuf_allow_all, shbuf_id);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int get_stack_bounds(uintptr_t* user_stack_base, size_t* user_stack_size)
+{
+    int rc = syscall(SC_get_stack_bounds, user_stack_base, user_stack_size);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+}

Userland/Libraries/LibC/serenity.h

@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <stdio.h>
+#include <unistd.h>
+
+__BEGIN_DECLS
+
+int disown(pid_t);
+
+int shbuf_create(int, void** buffer);
+int shbuf_allow_pid(int, pid_t peer_pid);
+int shbuf_allow_all(int);
+void* shbuf_get(int shbuf_id, size_t* size);
+int shbuf_release(int shbuf_id);
+int shbuf_seal(int shbuf_id);
+
+int module_load(const char* path, size_t path_length);
+int module_unload(const char* name, size_t name_length);
+
+int profiling_enable(pid_t);
+int profiling_disable(pid_t);
+
+#define THREAD_PRIORITY_MIN 1
+#define THREAD_PRIORITY_LOW 10
+#define THREAD_PRIORITY_NORMAL 30
+#define THREAD_PRIORITY_HIGH 50
+#define THREAD_PRIORITY_MAX 99
+
+int set_thread_boost(pid_t tid, int amount);
+int set_process_boost(pid_t, int amount);
+
+#define FUTEX_WAIT 1
+#define FUTEX_WAKE 2
+
+int futex(int32_t* userspace_address, int futex_op, int32_t value, const struct timespec* timeout);
+
+#define PURGE_ALL_VOLATILE 0x1
+#define PURGE_ALL_CLEAN_INODE 0x2
+
+int purge(int mode);
+
+#define PERF_EVENT_SAMPLE 0
+#define PERF_EVENT_MALLOC 1
+#define PERF_EVENT_FREE 2
+
+int perf_event(int type, uintptr_t arg1, uintptr_t arg2);
+
+int get_stack_bounds(uintptr_t* user_stack_base, size_t* user_stack_size);
+
+#ifdef __i386__
+ALWAYS_INLINE void send_secret_data_to_userspace_emulator(uintptr_t data1, uintptr_t data2, uintptr_t data3)
+{
+    asm volatile(
+        ".byte 0xd6\n"
+        ".byte 0xd6\n" ::
+            : "eax");
+    asm volatile(
+        "push %%eax\n"
+        "push %%ecx\n"
+        "push %%edx\n"
+        "pop %%edx\n"
+        "pop %%ecx\n"
+        "pop %%eax\n" ::"a"(data1),
+        "c"(data2), "d"(data3)
+        : "memory");
+}
+#elif __x86_64__
+ALWAYS_INLINE void send_secret_data_to_userspace_emulator(uintptr_t, uintptr_t, uintptr_t)
+{
+}
+#endif
+
+__END_DECLS

Userland/Libraries/LibC/setjmp.S

@@ -0,0 +1,57 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+.global setjmp
+setjmp:
+    mov 4(%esp), %eax
+    mov %ebx, 0(%eax)
+    mov %esi, 4(%eax)
+    mov %edi, 8(%eax)
+    mov %ebp, 12(%eax)
+    lea 4(%esp), %ecx
+    mov %ecx, 16(%eax)
+    mov (%esp), %ecx
+    mov %ecx, 20(%eax)
+    xor %eax, %eax
+    ret
+
+.global longjmp
+longjmp:
+    mov 4(%esp), %edx
+    mov 8(%esp), %eax
+    mov 0(%edx), %ebx
+    mov 4(%edx), %esi
+    mov 8(%edx), %edi
+    mov 12(%edx), %ebp
+    mov 16(%edx), %ecx
+    mov %ecx, %esp
+    mov 20(%edx), %ecx
+    test %eax, %eax
+    jnz  .nonzero
+    mov 1, %eax
+.nonzero:
+    jmp *%ecx
+

Userland/Libraries/LibC/setjmp.h

@@ -0,0 +1,52 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <bits/stdint.h>
+#include <signal.h>
+#include <stdbool.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+struct __jmp_buf {
+    uint32_t regs[6];
+    bool did_save_signal_mask;
+    sigset_t saved_signal_mask;
+};
+
+typedef struct __jmp_buf jmp_buf[1];
+typedef struct __jmp_buf sigjmp_buf[1];
+
+int setjmp(jmp_buf);
+void longjmp(jmp_buf, int val);
+
+int sigsetjmp(sigjmp_buf, int savesigs);
+void siglongjmp(sigjmp_buf, int val);
+
+__END_DECLS

Userland/Libraries/LibC/signal.cpp

@@ -0,0 +1,248 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/API/Syscall.h>
+#include <assert.h>
+#include <errno.h>
+#include <setjmp.h>
+#include <signal.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+extern "C" {
+
+int kill(pid_t pid, int sig)
+{
+    int rc = syscall(SC_kill, pid, sig);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int killpg(int pgrp, int sig)
+{
+    int rc = syscall(SC_killpg, pgrp, sig);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int raise(int sig)
+{
+    // FIXME: Support multi-threaded programs.
+    return kill(getpid(), sig);
+}
+
+sighandler_t signal(int signum, sighandler_t handler)
+{
+    struct sigaction new_act;
+    struct sigaction old_act;
+    new_act.sa_handler = handler;
+    new_act.sa_flags = 0;
+    new_act.sa_mask = 0;
+    int rc = sigaction(signum, &new_act, &old_act);
+    if (rc < 0)
+        return SIG_ERR;
+    return old_act.sa_handler;
+}
+
+int sigaction(int signum, const struct sigaction* act, struct sigaction* old_act)
+{
+    int rc = syscall(SC_sigaction, signum, act, old_act);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int sigemptyset(sigset_t* set)
+{
+    *set = 0;
+    return 0;
+}
+
+int sigfillset(sigset_t* set)
+{
+    *set = 0xffffffff;
+    return 0;
+}
+
+int sigaddset(sigset_t* set, int sig)
+{
+    if (sig < 1 || sig > 32) {
+        errno = EINVAL;
+        return -1;
+    }
+    *set |= 1 << (sig - 1);
+    return 0;
+}
+
+int sigdelset(sigset_t* set, int sig)
+{
+    if (sig < 1 || sig > 32) {
+        errno = EINVAL;
+        return -1;
+    }
+    *set &= ~(1 << (sig - 1));
+    return 0;
+}
+
+int sigismember(const sigset_t* set, int sig)
+{
+    if (sig < 1 || sig > 32) {
+        errno = EINVAL;
+        return -1;
+    }
+    if (*set & (1 << (sig - 1)))
+        return 1;
+    return 0;
+}
+
+int sigprocmask(int how, const sigset_t* set, sigset_t* old_set)
+{
+    int rc = syscall(SC_sigprocmask, how, set, old_set);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int sigpending(sigset_t* set)
+{
+    int rc = syscall(SC_sigpending, set);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+const char* sys_siglist[NSIG] = {
+    "Invalid signal number",
+    "Hangup",
+    "Interrupt",
+    "Quit",
+    "Illegal instruction",
+    "Trap",
+    "Aborted",
+    "Bus error",
+    "Division by zero",
+    "Killed",
+    "User signal 1",
+    "Segmentation violation",
+    "User signal 2",
+    "Broken pipe",
+    "Alarm clock",
+    "Terminated",
+    "Stack fault",
+    "Child exited",
+    "Continued",
+    "Stopped (signal)",
+    "Stopped",
+    "Stopped (tty input)",
+    "Stopped (tty output)",
+    "Urgent I/O condition)",
+    "CPU limit exceeded",
+    "File size limit exceeded",
+    "Virtual timer expired",
+    "Profiling timer expired",
+    "Window changed",
+    "I/O possible",
+    "Power failure",
+    "Bad system call",
+};
+
+int sigsetjmp(jmp_buf env, int savesigs)
+{
+    if (savesigs) {
+        int rc = sigprocmask(0, nullptr, &env->saved_signal_mask);
+        assert(rc == 0);
+        env->did_save_signal_mask = true;
+    } else {
+        env->did_save_signal_mask = false;
+    }
+    return setjmp(env);
+}
+void siglongjmp(jmp_buf env, int val)
+{
+    if (env->did_save_signal_mask) {
+        int rc = sigprocmask(SIG_SETMASK, &env->saved_signal_mask, nullptr);
+        assert(rc == 0);
+    }
+    longjmp(env, val);
+}
+
+int sigsuspend(const sigset_t*)
+{
+    dbgprintf("FIXME: Implement sigsuspend()\n");
+    ASSERT_NOT_REACHED();
+}
+
+static const char* signal_names[] = {
+    "INVAL",
+    "HUP",
+    "INT",
+    "QUIT",
+    "ILL",
+    "TRAP",
+    "ABRT",
+    "BUS",
+    "FPE",
+    "KILL",
+    "USR1",
+    "SEGV",
+    "USR2",
+    "PIPE",
+    "ALRM",
+    "TERM",
+    "STKFLT",
+    "CHLD",
+    "CONT",
+    "STOP",
+    "TSTP",
+    "TTIN",
+    "TTOU",
+    "URG",
+    "XCPU",
+    "XFSZ",
+    "VTALRM",
+    "PROF",
+    "WINCH",
+    "IO",
+    "INFO",
+    "SYS",
+};
+
+static_assert(sizeof(signal_names) == sizeof(const char*) * NSIG);
+
+int getsignalbyname(const char* name)
+{
+    ASSERT(name);
+    for (size_t i = 0; i < NSIG; ++i) {
+        auto* signal_name = signal_names[i];
+        if (!strcmp(signal_name, name))
+            return i;
+    }
+    errno = EINVAL;
+    return -1;
+}
+
+const char* getsignalname(int signal)
+{
+    if (signal < 0 || signal >= NSIG) {
+        errno = EINVAL;
+        return nullptr;
+    }
+    return signal_names[signal];
+}
+}

Userland/Libraries/LibC/signal.h

@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <signal_numbers.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+typedef void (*__sighandler_t)(int);
+typedef __sighandler_t sighandler_t;
+
+typedef uint32_t sigset_t;
+typedef uint32_t sig_atomic_t;
+
+union sigval {
+    int sival_int;
+    void* sival_ptr;
+};
+
+typedef struct siginfo {
+    int si_signo;
+    int si_code;
+    pid_t si_pid;
+    uid_t si_uid;
+    void* si_addr;
+    int si_status;
+    union sigval si_value;
+} siginfo_t;
+
+struct sigaction {
+    union {
+        void (*sa_handler)(int);
+        void (*sa_sigaction)(int, siginfo_t*, void*);
+    };
+    sigset_t sa_mask;
+    int sa_flags;
+};
+
+int kill(pid_t, int sig);
+int killpg(int pgrp, int sig);
+sighandler_t signal(int sig, sighandler_t);
+int pthread_sigmask(int how, const sigset_t* set, sigset_t* ol_dset);
+int sigaction(int sig, const struct sigaction* act, struct sigaction* old_act);
+int sigemptyset(sigset_t*);
+int sigfillset(sigset_t*);
+int sigaddset(sigset_t*, int sig);
+int sigdelset(sigset_t*, int sig);
+int sigismember(const sigset_t*, int sig);
+int sigprocmask(int how, const sigset_t* set, sigset_t* old_set);
+int sigpending(sigset_t*);
+int sigsuspend(const sigset_t*);
+int raise(int sig);
+int getsignalbyname(const char*);
+const char* getsignalname(int);
+
+extern const char* sys_siglist[NSIG];
+
+#define SIG_DFL ((__sighandler_t)0)
+#define SIG_ERR ((__sighandler_t)-1)
+#define SIG_IGN ((__sighandler_t)1)
+
+#define SA_NOCLDSTOP 1
+#define SA_NOCLDWAIT 2
+#define SA_SIGINFO 4
+#define SA_ONSTACK 0x08000000
+#define SA_RESTART 0x10000000
+#define SA_NODEFER 0x40000000
+#define SA_RESETHAND 0x80000000
+
+#define SA_NOMASK SA_NODEFER
+#define SA_ONESHOT SA_RESETHAND
+
+#define SIG_BLOCK 0
+#define SIG_UNBLOCK 1
+#define SIG_SETMASK 2
+
+#define CLD_EXITED 0
+#define CLD_KILLED 1
+#define CLD_DUMPED 2
+#define CLD_TRAPPED 3
+#define CLD_STOPPED 4
+#define CLD_CONTINUED 5
+
+__END_DECLS

Userland/Libraries/LibC/signal_numbers.h

@@ -0,0 +1,61 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#define SIGINVAL 0
+#define SIGHUP 1
+#define SIGINT 2
+#define SIGQUIT 3
+#define SIGILL 4
+#define SIGTRAP 5
+#define SIGABRT 6
+#define SIGBUS 7
+#define SIGFPE 8
+#define SIGKILL 9
+#define SIGUSR1 10
+#define SIGSEGV 11
+#define SIGUSR2 12
+#define SIGPIPE 13
+#define SIGALRM 14
+#define SIGTERM 15
+#define SIGSTKFLT 16
+#define SIGCHLD 17
+#define SIGCONT 18
+#define SIGSTOP 19
+#define SIGTSTP 20
+#define SIGTTIN 21
+#define SIGTTOU 22
+#define SIGURG 23
+#define SIGXCPU 24
+#define SIGXFSZ 25
+#define SIGVTALRM 26
+#define SIGPROF 27
+#define SIGWINCH 28
+#define SIGIO 29
+#define SIGINFO 30
+#define SIGSYS 31
+#define NSIG 32

Userland/Libraries/LibC/spawn.cpp

@@ -0,0 +1,289 @@
+/*
+ * Copyright (c) 2020, Nico Weber <thakis@chromium.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* posix_spawn and friends
+ *
+ * values from POSIX standard unix specification
+ *
+ * https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/spawn.h.html
+ */
+
+#include <spawn.h>
+
+#include <AK/Function.h>
+#include <AK/Vector.h>
+#include <fcntl.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/stat.h>
+#include <sys/types.h>
+#include <unistd.h>
+
+struct posix_spawn_file_actions_state {
+    Vector<Function<int()>, 4> actions;
+};
+
+extern "C" {
+
+[[noreturn]] static void posix_spawn_child(const char* path, const posix_spawn_file_actions_t* file_actions, const posix_spawnattr_t* attr, char* const argv[], char* const envp[], int (*exec)(const char*, char* const[], char* const[]))
+{
+    if (attr) {
+        short flags = attr->flags;
+        if (flags & POSIX_SPAWN_RESETIDS) {
+            if (seteuid(getuid()) < 0) {
+                perror("posix_spawn seteuid");
+                _exit(127);
+            }
+            if (setegid(getgid()) < 0) {
+                perror("posix_spawn setegid");
+                _exit(127);
+            }
+        }
+        if (flags & POSIX_SPAWN_SETPGROUP) {
+            if (setpgid(0, attr->pgroup) < 0) {
+                perror("posix_spawn setpgid");
+                _exit(127);
+            }
+        }
+        if (flags & POSIX_SPAWN_SETSCHEDPARAM) {
+            if (sched_setparam(0, &attr->schedparam) < 0) {
+                perror("posix_spawn sched_setparam");
+                _exit(127);
+            }
+        }
+        if (flags & POSIX_SPAWN_SETSIGDEF) {
+            struct sigaction default_action;
+            default_action.sa_flags = 0;
+            sigemptyset(&default_action.sa_mask);
+            default_action.sa_handler = SIG_DFL;
+
+            sigset_t sigdefault = attr->sigdefault;
+            for (int i = 0; i < NSIG; ++i) {
+                if (sigismember(&sigdefault, i) && sigaction(i, &default_action, nullptr) < 0) {
+                    perror("posix_spawn sigaction");
+                    _exit(127);
+                }
+            }
+        }
+        if (flags & POSIX_SPAWN_SETSIGMASK) {
+            if (sigprocmask(SIG_SETMASK, &attr->sigmask, nullptr) < 0) {
+                perror("posix_spawn sigprocmask");
+                _exit(127);
+            }
+        }
+        if (flags & POSIX_SPAWN_SETSID) {
+            if (setsid() < 0) {
+                perror("posix_spawn setsid");
+                _exit(127);
+            }
+        }
+
+        // FIXME: POSIX_SPAWN_SETSCHEDULER
+    }
+
+    if (file_actions) {
+        for (const auto& action : file_actions->state->actions) {
+            if (action() < 0) {
+                perror("posix_spawn file action");
+                _exit(127);
+            }
+        }
+    }
+
+    exec(path, argv, envp);
+    perror("posix_spawn exec");
+    _exit(127);
+}
+
+int posix_spawn(pid_t* out_pid, const char* path, const posix_spawn_file_actions_t* file_actions, const posix_spawnattr_t* attr, char* const argv[], char* const envp[])
+{
+    pid_t child_pid = fork();
+    if (child_pid < 0)
+        return errno;
+
+    if (child_pid != 0) {
+        *out_pid = child_pid;
+        return 0;
+    }
+
+    posix_spawn_child(path, file_actions, attr, argv, envp, execve);
+}
+
+int posix_spawnp(pid_t* out_pid, const char* path, const posix_spawn_file_actions_t* file_actions, const posix_spawnattr_t* attr, char* const argv[], char* const envp[])
+{
+    pid_t child_pid = fork();
+    if (child_pid < 0)
+        return errno;
+
+    if (child_pid != 0) {
+        *out_pid = child_pid;
+        return 0;
+    }
+
+    posix_spawn_child(path, file_actions, attr, argv, envp, execvpe);
+}
+
+int posix_spawn_file_actions_addchdir(posix_spawn_file_actions_t* actions, const char* path)
+{
+    actions->state->actions.append([path]() { return chdir(path); });
+    return 0;
+}
+
+int posix_spawn_file_actions_addfchdir(posix_spawn_file_actions_t* actions, int fd)
+{
+    actions->state->actions.append([fd]() { return fchdir(fd); });
+    return 0;
+}
+
+int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t* actions, int fd)
+{
+    actions->state->actions.append([fd]() { return close(fd); });
+    return 0;
+}
+
+int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t* actions, int old_fd, int new_fd)
+{
+    actions->state->actions.append([old_fd, new_fd]() { return dup2(old_fd, new_fd); });
+    return 0;
+}
+
+int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t* actions, int want_fd, const char* path, int flags, mode_t mode)
+{
+    actions->state->actions.append([want_fd, path, flags, mode]() {
+        int opened_fd = open(path, flags, mode);
+        if (opened_fd < 0 || opened_fd == want_fd)
+            return opened_fd;
+        if (int rc = dup2(opened_fd, want_fd); rc < 0)
+            return rc;
+        return close(opened_fd);
+    });
+    return 0;
+}
+
+int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t* actions)
+{
+    delete actions->state;
+    return 0;
+}
+
+int posix_spawn_file_actions_init(posix_spawn_file_actions_t* actions)
+{
+    actions->state = new posix_spawn_file_actions_state;
+    return 0;
+}
+
+int posix_spawnattr_destroy(posix_spawnattr_t*)
+{
+    return 0;
+}
+
+int posix_spawnattr_getflags(const posix_spawnattr_t* attr, short* out_flags)
+{
+    *out_flags = attr->flags;
+    return 0;
+}
+
+int posix_spawnattr_getpgroup(const posix_spawnattr_t* attr, pid_t* out_pgroup)
+{
+    *out_pgroup = attr->pgroup;
+    return 0;
+}
+
+int posix_spawnattr_getschedparam(const posix_spawnattr_t* attr, struct sched_param* out_schedparam)
+{
+    *out_schedparam = attr->schedparam;
+    return 0;
+}
+
+int posix_spawnattr_getschedpolicy(const posix_spawnattr_t* attr, int* out_schedpolicty)
+{
+    *out_schedpolicty = attr->schedpolicy;
+    return 0;
+}
+
+int posix_spawnattr_getsigdefault(const posix_spawnattr_t* attr, sigset_t* out_sigdefault)
+{
+    *out_sigdefault = attr->sigdefault;
+    return 0;
+}
+
+int posix_spawnattr_getsigmask(const posix_spawnattr_t* attr, sigset_t* out_sigmask)
+{
+    *out_sigmask = attr->sigmask;
+    return 0;
+}
+
+int posix_spawnattr_init(posix_spawnattr_t* attr)
+{
+    attr->flags = 0;
+    attr->pgroup = 0;
+    // attr->schedparam intentionally not written; its default value is unspecified.
+    // attr->schedpolicy intentionally not written; its default value is unspecified.
+    sigemptyset(&attr->sigdefault);
+    // attr->sigmask intentionally not written; its default value is unspecified.
+    return 0;
+}
+
+int posix_spawnattr_setflags(posix_spawnattr_t* attr, short flags)
+{
+    if (flags & ~(POSIX_SPAWN_RESETIDS | POSIX_SPAWN_SETPGROUP | POSIX_SPAWN_SETSCHEDPARAM | POSIX_SPAWN_SETSCHEDULER | POSIX_SPAWN_SETSIGDEF | POSIX_SPAWN_SETSIGMASK | POSIX_SPAWN_SETSID))
+        return EINVAL;
+
+    attr->flags = flags;
+    return 0;
+}
+
+int posix_spawnattr_setpgroup(posix_spawnattr_t* attr, pid_t pgroup)
+{
+    attr->pgroup = pgroup;
+    return 0;
+}
+
+int posix_spawnattr_setschedparam(posix_spawnattr_t* attr, const struct sched_param* schedparam)
+{
+    attr->schedparam = *schedparam;
+    return 0;
+}
+
+int posix_spawnattr_setschedpolicy(posix_spawnattr_t* attr, int schedpolicy)
+{
+    attr->schedpolicy = schedpolicy;
+    return 0;
+}
+
+int posix_spawnattr_setsigdefault(posix_spawnattr_t* attr, const sigset_t* sigdefault)
+{
+    attr->sigdefault = *sigdefault;
+    return 0;
+}
+
+int posix_spawnattr_setsigmask(posix_spawnattr_t* attr, const sigset_t* sigmask)
+{
+    attr->sigmask = *sigmask;
+    return 0;
+}
+}

Userland/Libraries/LibC/spawn.h

@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2020, Nico Weber <thakis@chromium.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
+ * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* posix_spawn and friends
+ *
+ * values from POSIX standard unix specification
+ *
+ * https://pubs.opengroup.org/onlinepubs/9699919799/basedefs/spawn.h.html
+ */
+
+#pragma once
+
+#include <sched.h>
+#include <signal.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+enum {
+    POSIX_SPAWN_RESETIDS = 1 << 0,
+    POSIX_SPAWN_SETPGROUP = 1 << 1,
+
+    POSIX_SPAWN_SETSCHEDPARAM = 1 << 2,
+    POSIX_SPAWN_SETSCHEDULER = 1 << 3,
+
+    POSIX_SPAWN_SETSIGDEF = 1 << 4,
+    POSIX_SPAWN_SETSIGMASK = 1 << 5,
+
+    POSIX_SPAWN_SETSID = 1 << 6,
+};
+
+#define POSIX_SPAWN_SETSID POSIX_SPAWN_SETSID
+
+struct posix_spawn_file_actions_state;
+typedef struct {
+    struct posix_spawn_file_actions_state* state;
+} posix_spawn_file_actions_t;
+
+typedef struct {
+    short flags;
+    pid_t pgroup;
+    struct sched_param schedparam;
+    int schedpolicy;
+    sigset_t sigdefault;
+    sigset_t sigmask;
+} posix_spawnattr_t;
+
+int posix_spawn(pid_t*, const char*, const posix_spawn_file_actions_t*, const posix_spawnattr_t*, char* const argv[], char* const envp[]);
+int posix_spawnp(pid_t*, const char*, const posix_spawn_file_actions_t*, const posix_spawnattr_t*, char* const argv[], char* const envp[]);
+
+int posix_spawn_file_actions_addchdir(posix_spawn_file_actions_t*, const char*);
+int posix_spawn_file_actions_addfchdir(posix_spawn_file_actions_t*, int);
+int posix_spawn_file_actions_addclose(posix_spawn_file_actions_t*, int);
+int posix_spawn_file_actions_adddup2(posix_spawn_file_actions_t*, int old_fd, int new_fd);
+int posix_spawn_file_actions_addopen(posix_spawn_file_actions_t*, int fd, const char*, int flags, mode_t);
+int posix_spawn_file_actions_destroy(posix_spawn_file_actions_t*);
+int posix_spawn_file_actions_init(posix_spawn_file_actions_t*);
+
+int posix_spawnattr_destroy(posix_spawnattr_t*);
+int posix_spawnattr_getflags(const posix_spawnattr_t*, short*);
+int posix_spawnattr_getpgroup(const posix_spawnattr_t*, pid_t*);
+int posix_spawnattr_getschedparam(const posix_spawnattr_t*, struct sched_param*);
+int posix_spawnattr_getschedpolicy(const posix_spawnattr_t*, int*);
+int posix_spawnattr_getsigdefault(const posix_spawnattr_t*, sigset_t*);
+int posix_spawnattr_getsigmask(const posix_spawnattr_t*, sigset_t*);
+int posix_spawnattr_init(posix_spawnattr_t*);
+int posix_spawnattr_setflags(posix_spawnattr_t*, short);
+int posix_spawnattr_setpgroup(posix_spawnattr_t*, pid_t);
+int posix_spawnattr_setschedparam(posix_spawnattr_t*, const struct sched_param*);
+int posix_spawnattr_setschedpolicy(posix_spawnattr_t*, int);
+int posix_spawnattr_setsigdefault(posix_spawnattr_t*, const sigset_t*);
+int posix_spawnattr_setsigmask(posix_spawnattr_t*, const sigset_t*);
+
+__END_DECLS

Userland/Libraries/LibC/ssp.cpp

@@ -0,0 +1,55 @@
+/*
+ * Copyright (c) 2021, Brian Gianforcaro <b.gianfo@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/Types.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sys/internals.h>
+#include <unistd.h>
+
+#if defined __SSP__ || defined __SSP_ALL__
+#    error "file must not be compiled with stack protection enabled on it. Use -fno-stack-protector"
+#endif
+
+extern "C" {
+
+extern u32 __stack_chk_guard;
+u32 __stack_chk_guard = (u32)0xc6c7c8c9;
+
+[[noreturn]] void __stack_chk_fail()
+{
+    dbgprintf("Error: USERSPACE(%d) Stack protector failure, stack smashing detected!\n", getpid());
+    if (__stdio_is_initialized)
+        fprintf(stderr, "Error: Stack protector failure, stack smashing detected!\n");
+    abort();
+}
+
+[[noreturn]] void __stack_chk_fail_local()
+{
+    __stack_chk_fail();
+}
+
+} // extern "C"

Userland/Libraries/LibC/stat.cpp

@@ -0,0 +1,99 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/API/Syscall.h>
+#include <assert.h>
+#include <errno.h>
+#include <stdio.h>
+#include <string.h>
+#include <sys/stat.h>
+#include <unistd.h>
+
+extern "C" {
+
+mode_t umask(mode_t mask)
+{
+    return syscall(SC_umask, mask);
+}
+
+int mkdir(const char* pathname, mode_t mode)
+{
+    if (!pathname) {
+        errno = EFAULT;
+        return -1;
+    }
+    int rc = syscall(SC_mkdir, pathname, strlen(pathname), mode);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int chmod(const char* pathname, mode_t mode)
+{
+    if (!pathname) {
+        errno = EFAULT;
+        return -1;
+    }
+    int rc = syscall(SC_chmod, pathname, strlen(pathname), mode);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int fchmod(int fd, mode_t mode)
+{
+    int rc = syscall(SC_fchmod, fd, mode);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int mkfifo(const char* pathname, mode_t mode)
+{
+    return mknod(pathname, mode | S_IFIFO, 0);
+}
+
+static int do_stat(const char* path, struct stat* statbuf, bool follow_symlinks)
+{
+    if (!path) {
+        errno = EFAULT;
+        return -1;
+    }
+    Syscall::SC_stat_params params { { path, strlen(path) }, statbuf, follow_symlinks };
+    int rc = syscall(SC_stat, &params);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+int lstat(const char* path, struct stat* statbuf)
+{
+    return do_stat(path, statbuf, false);
+}
+
+int stat(const char* path, struct stat* statbuf)
+{
+    return do_stat(path, statbuf, true);
+}
+
+int fstat(int fd, struct stat* statbuf)
+{
+    int rc = syscall(SC_fstat, fd, statbuf);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+}

Userland/Libraries/LibC/stdarg.h

@@ -0,0 +1,44 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#if defined(KERNEL)
+#    define __BEGIN_DECLS
+#    define __END_DECLS
+#else
+#    include <sys/cdefs.h>
+#endif
+
+__BEGIN_DECLS
+
+typedef __builtin_va_list va_list;
+
+#define va_start(v, l) __builtin_va_start(v, l)
+#define va_end(v) __builtin_va_end(v)
+#define va_arg(v, l) __builtin_va_arg(v, l)
+
+__END_DECLS

Userland/Libraries/LibC/stdbool.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#ifndef __cplusplus
+
+#    include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+#    define bool _Bool
+#    define true 1
+#    define false 0
+#    define __bool_true_false_are_Defined 1
+
+__END_DECLS
+
+#endif

Userland/Libraries/LibC/stddef.h

@@ -0,0 +1,42 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#ifndef KERNEL
+
+#    include <sys/cdefs.h>
+
+#    ifdef __cplusplus
+#        define NULL nullptr
+#    else
+#        define NULL ((void*)0)
+#    endif
+
+typedef __PTRDIFF_TYPE__ ptrdiff_t;
+typedef __SIZE_TYPE__ size_t;
+
+#endif

Userland/Libraries/LibC/stdint.h

@@ -0,0 +1,31 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+
+#include <bits/stdint.h>

Userland/Libraries/LibC/stdio.h

@@ -0,0 +1,120 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#define _STDIO_H // Make GMP believe we exist.
+
+#include <bits/FILE.h>
+#include <limits.h>
+#include <stdarg.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+#define FILENAME_MAX 1024
+
+__BEGIN_DECLS
+#ifndef EOF
+#    define EOF (-1)
+#endif
+
+#define SEEK_SET 0
+#define SEEK_CUR 1
+#define SEEK_END 2
+
+#define _IOFBF 0
+#define _IOLBF 1
+#define _IONBF 2
+
+#define L_tmpnam 256
+
+extern FILE* stdin;
+extern FILE* stdout;
+extern FILE* stderr;
+
+typedef off_t fpos_t;
+
+int fseek(FILE*, long offset, int whence);
+int fseeko(FILE*, off_t offset, int whence);
+int fgetpos(FILE*, fpos_t*);
+int fsetpos(FILE*, const fpos_t*);
+long ftell(FILE*);
+off_t ftello(FILE*);
+char* fgets(char* buffer, int size, FILE*);
+int fputc(int ch, FILE*);
+int fileno(FILE*);
+int fgetc(FILE*);
+int getc(FILE*);
+int getc_unlocked(FILE* stream);
+int getchar();
+ssize_t getdelim(char**, size_t*, int, FILE*);
+ssize_t getline(char**, size_t*, FILE*);
+int ungetc(int c, FILE*);
+int remove(const char* pathname);
+FILE* fdopen(int fd, const char* mode);
+FILE* fopen(const char* pathname, const char* mode);
+FILE* freopen(const char* pathname, const char* mode, FILE*);
+void flockfile(FILE* filehandle);
+void funlockfile(FILE* filehandle);
+int fclose(FILE*);
+void rewind(FILE*);
+void clearerr(FILE*);
+int ferror(FILE*);
+int feof(FILE*);
+int fflush(FILE*);
+size_t fread(void* ptr, size_t size, size_t nmemb, FILE*);
+size_t fwrite(const void* ptr, size_t size, size_t nmemb, FILE*);
+int vprintf(const char* fmt, va_list) __attribute__((format(printf, 1, 0)));
+int vfprintf(FILE*, const char* fmt, va_list) __attribute__((format(printf, 2, 0)));
+int vsprintf(char* buffer, const char* fmt, va_list) __attribute__((format(printf, 2, 0)));
+int vsnprintf(char* buffer, size_t, const char* fmt, va_list) __attribute__((format(printf, 3, 0)));
+int fprintf(FILE*, const char* fmt, ...) __attribute__((format(printf, 2, 3)));
+int printf(const char* fmt, ...) __attribute__((format(printf, 1, 2)));
+int dbgprintf(const char* fmt, ...) __attribute__((format(printf, 1, 2)));
+void dbgputch(char);
+int dbgputstr(const char*, ssize_t);
+int sprintf(char* buffer, const char* fmt, ...) __attribute__((format(printf, 2, 3)));
+int snprintf(char* buffer, size_t, const char* fmt, ...) __attribute__((format(printf, 3, 4)));
+int putchar(int ch);
+int putc(int ch, FILE*);
+int puts(const char*);
+int fputs(const char*, FILE*);
+void perror(const char*);
+int scanf(const char* fmt, ...) __attribute__((format(scanf, 1, 2)));
+int sscanf(const char* str, const char* fmt, ...) __attribute__((format(scanf, 2, 3)));
+int fscanf(FILE*, const char* fmt, ...) __attribute__((format(scanf, 2, 3)));
+int vfscanf(FILE*, const char*, va_list) __attribute__((format(scanf, 2, 0)));
+int vsscanf(const char*, const char*, va_list) __attribute__((format(scanf, 2, 0)));
+int setvbuf(FILE*, char* buf, int mode, size_t);
+void setbuf(FILE*, char* buf);
+void setlinebuf(FILE*);
+int rename(const char* oldpath, const char* newpath);
+FILE* tmpfile();
+char* tmpnam(char*);
+FILE* popen(const char* command, const char* type);
+int pclose(FILE*);
+
+__END_DECLS

Userland/Libraries/LibC/stdlib.h

@@ -0,0 +1,109 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <stddef.h>
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__attribute__((warn_unused_result)) int __generate_unique_filename(char* pattern);
+
+__BEGIN_DECLS
+
+#define EXIT_SUCCESS 0
+#define EXIT_FAILURE 1
+#define MB_CUR_MAX 1
+
+__attribute__((malloc)) __attribute__((alloc_size(1))) void* malloc(size_t);
+__attribute__((malloc)) __attribute__((alloc_size(1, 2))) void* calloc(size_t nmemb, size_t);
+size_t malloc_size(void*);
+void serenity_dump_malloc_stats(void);
+void free(void*);
+__attribute__((alloc_size(2))) void* realloc(void* ptr, size_t);
+char* getenv(const char* name);
+int putenv(char*);
+int unsetenv(const char*);
+int clearenv(void);
+int setenv(const char* name, const char* value, int overwrite);
+int atoi(const char*);
+long atol(const char*);
+long long atoll(const char*);
+double strtod(const char*, char** endptr);
+long double strtold(const char*, char** endptr);
+float strtof(const char*, char** endptr);
+long strtol(const char*, char** endptr, int base);
+long long strtoll(const char*, char** endptr, int base);
+unsigned long long strtoull(const char*, char** endptr, int base);
+unsigned long strtoul(const char*, char** endptr, int base);
+void qsort(void* base, size_t nmemb, size_t size, int (*compar)(const void*, const void*));
+void qsort_r(void* base, size_t nmemb, size_t size, int (*compar)(const void*, const void*, void*), void* arg);
+int atexit(void (*function)());
+__attribute__((noreturn)) void exit(int status);
+__attribute__((noreturn)) void abort();
+char* ptsname(int fd);
+int ptsname_r(int fd, char* buffer, size_t);
+int abs(int);
+long labs(long);
+double atof(const char*);
+int system(const char* command);
+char* mktemp(char*);
+int mkstemp(char*);
+char* mkdtemp(char*);
+void* bsearch(const void* key, const void* base, size_t nmemb, size_t size, int (*compar)(const void*, const void*));
+size_t mbstowcs(wchar_t*, const char*, size_t);
+int mbtowc(wchar_t*, const char*, size_t);
+int wctomb(char*, wchar_t);
+size_t wcstombs(char*, const wchar_t*, size_t);
+char* realpath(const char* pathname, char* buffer);
+
+#define RAND_MAX 32767
+int rand();
+void srand(unsigned seed);
+
+long int random();
+void srandom(unsigned seed);
+
+uint32_t arc4random(void);
+void arc4random_buf(void*, size_t);
+uint32_t arc4random_uniform(uint32_t);
+
+typedef struct {
+    int quot;
+    int rem;
+} div_t;
+div_t div(int, int);
+typedef struct {
+    long quot;
+    long rem;
+} ldiv_t;
+ldiv_t ldiv(long, long);
+
+int posix_openpt(int flags);
+int grantpt(int fd);
+int unlockpt(int fd);
+
+__END_DECLS

Userland/Libraries/LibC/string.cpp

@@ -0,0 +1,486 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <AK/MemMem.h>
+#include <AK/Platform.h>
+#include <AK/StdLibExtras.h>
+#include <AK/Types.h>
+#include <assert.h>
+#include <ctype.h>
+#include <errno.h>
+#include <signal.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <string.h>
+
+extern "C" {
+
+size_t strspn(const char* s, const char* accept)
+{
+    const char* p = s;
+cont:
+    char ch = *p++;
+    char ac;
+    for (const char* ap = accept; (ac = *ap++) != '\0';) {
+        if (ac == ch)
+            goto cont;
+    }
+    return p - 1 - s;
+}
+
+size_t strcspn(const char* s, const char* reject)
+{
+    for (auto* p = s;;) {
+        char c = *p++;
+        auto* rp = reject;
+        char rc;
+        do {
+            if ((rc = *rp++) == c)
+                return p - 1 - s;
+        } while (rc);
+    }
+}
+
+size_t strlen(const char* str)
+{
+    size_t len = 0;
+    while (*(str++))
+        ++len;
+    return len;
+}
+
+size_t strnlen(const char* str, size_t maxlen)
+{
+    size_t len = 0;
+    for (; len < maxlen && *str; str++)
+        len++;
+    return len;
+}
+
+char* strdup(const char* str)
+{
+    size_t len = strlen(str);
+    char* new_str = (char*)malloc(len + 1);
+    memcpy(new_str, str, len);
+    new_str[len] = '\0';
+    return new_str;
+}
+
+char* strndup(const char* str, size_t maxlen)
+{
+    size_t len = strnlen(str, maxlen);
+    char* new_str = (char*)malloc(len + 1);
+    memcpy(new_str, str, len);
+    new_str[len] = 0;
+    return new_str;
+}
+
+int strcmp(const char* s1, const char* s2)
+{
+    while (*s1 == *s2++)
+        if (*s1++ == 0)
+            return 0;
+    return *(const unsigned char*)s1 - *(const unsigned char*)--s2;
+}
+
+int strncmp(const char* s1, const char* s2, size_t n)
+{
+    if (!n)
+        return 0;
+    do {
+        if (*s1 != *s2++)
+            return *(const unsigned char*)s1 - *(const unsigned char*)--s2;
+        if (*s1++ == 0)
+            break;
+    } while (--n);
+    return 0;
+}
+
+int memcmp(const void* v1, const void* v2, size_t n)
+{
+    auto* s1 = (const uint8_t*)v1;
+    auto* s2 = (const uint8_t*)v2;
+    while (n-- > 0) {
+        if (*s1++ != *s2++)
+            return s1[-1] < s2[-1] ? -1 : 1;
+    }
+    return 0;
+}
+
+#if ARCH(I386)
+void* memcpy(void* dest_ptr, const void* src_ptr, size_t n)
+{
+    void* original_dest = dest_ptr;
+    asm volatile(
+        "rep movsb"
+        : "+D"(dest_ptr), "+S"(src_ptr), "+c"(n)::"memory");
+    return original_dest;
+}
+
+void* memset(void* dest_ptr, int c, size_t n)
+{
+    void* original_dest = dest_ptr;
+    asm volatile(
+        "rep stosb\n"
+        : "=D"(dest_ptr), "=c"(n)
+        : "0"(dest_ptr), "1"(n), "a"(c)
+        : "memory");
+    return original_dest;
+}
+#else
+void* memcpy(void* dest_ptr, const void* src_ptr, size_t n)
+{
+    auto* dest = (u8*)dest_ptr;
+    auto* src = (const u8*)src_ptr;
+    for (size_t i = 0; i < n; ++i)
+        dest[i] = src[i];
+    return dest_ptr;
+}
+
+void* memset(void* dest_ptr, int c, size_t n)
+{
+    auto* dest = (u8*)dest_ptr;
+    for (size_t i = 0; i < n; ++i)
+        dest[i] = (u8)c;
+    return dest_ptr;
+}
+#endif
+
+void* memmove(void* dest, const void* src, size_t n)
+{
+    if (dest < src)
+        return memcpy(dest, src, n);
+
+    u8* pd = (u8*)dest;
+    const u8* ps = (const u8*)src;
+    for (pd += n, ps += n; n--;)
+        *--pd = *--ps;
+    return dest;
+}
+
+const void* memmem(const void* haystack, size_t haystack_length, const void* needle, size_t needle_length)
+{
+    return AK::memmem(haystack, haystack_length, needle, needle_length);
+}
+
+char* strcpy(char* dest, const char* src)
+{
+    char* originalDest = dest;
+    while ((*dest++ = *src++) != '\0')
+        ;
+    return originalDest;
+}
+
+char* strncpy(char* dest, const char* src, size_t n)
+{
+    size_t i;
+    for (i = 0; i < n && src[i] != '\0'; ++i)
+        dest[i] = src[i];
+    for (; i < n; ++i)
+        dest[i] = '\0';
+    return dest;
+}
+
+size_t strlcpy(char* dest, const char* src, size_t n)
+{
+    size_t i;
+    // Would like to test i < n - 1 here, but n might be 0.
+    for (i = 0; i + 1 < n && src[i] != '\0'; ++i)
+        dest[i] = src[i];
+    if (n)
+        dest[i] = '\0';
+    for (; src[i] != '\0'; ++i)
+        ; // Determine the length of src, don't copy.
+    return i;
+}
+
+char* strchr(const char* str, int c)
+{
+    char ch = c;
+    for (;; ++str) {
+        if (*str == ch)
+            return const_cast<char*>(str);
+        if (!*str)
+            return nullptr;
+    }
+}
+
+char* strchrnul(const char* str, int c)
+{
+    char ch = c;
+    for (;; ++str) {
+        if (*str == ch || !*str)
+            return const_cast<char*>(str);
+    }
+}
+
+void* memchr(const void* ptr, int c, size_t size)
+{
+    char ch = c;
+    auto* cptr = (const char*)ptr;
+    for (size_t i = 0; i < size; ++i) {
+        if (cptr[i] == ch)
+            return const_cast<char*>(cptr + i);
+    }
+    return nullptr;
+}
+
+char* strrchr(const char* str, int ch)
+{
+    char* last = nullptr;
+    char c;
+    for (; (c = *str); ++str) {
+        if (c == ch)
+            last = const_cast<char*>(str);
+    }
+    return last;
+}
+
+char* strcat(char* dest, const char* src)
+{
+    size_t dest_length = strlen(dest);
+    size_t i;
+    for (i = 0; src[i] != '\0'; i++)
+        dest[dest_length + i] = src[i];
+    dest[dest_length + i] = '\0';
+    return dest;
+}
+
+char* strncat(char* dest, const char* src, size_t n)
+{
+    size_t dest_length = strlen(dest);
+    size_t i;
+    for (i = 0; i < n && src[i] != '\0'; i++)
+        dest[dest_length + i] = src[i];
+    dest[dest_length + i] = '\0';
+    return dest;
+}
+
+const char* const sys_errlist[] = {
+    "Success (not an error)",
+    "Operation not permitted",
+    "No such file or directory",
+    "No such process",
+    "Interrupted syscall",
+    "I/O error",
+    "No such device or address",
+    "Argument list too long",
+    "Exec format error",
+    "Bad fd number",
+    "No child processes",
+    "Try again",
+    "Out of memory",
+    "Permission denied",
+    "Bad address",
+    "Block device required",
+    "Device or resource busy",
+    "File already exists",
+    "Cross-device link",
+    "No such device",
+    "Not a directory",
+    "Is a directory",
+    "Invalid argument",
+    "File table overflow",
+    "Too many open files",
+    "Not a TTY",
+    "Text file busy",
+    "File too large",
+    "No space left on device",
+    "Illegal seek",
+    "Read-only filesystem",
+    "Too many links",
+    "Broken pipe",
+    "Range error",
+    "Name too long",
+    "Too many symlinks",
+    "Overflow",
+    "Operation not supported",
+    "No such syscall",
+    "Not implemented",
+    "Address family not supported",
+    "Not a socket",
+    "Address in use",
+    "Failed without setting an error code (bug!)",
+    "Directory not empty",
+    "Math argument out of domain",
+    "Connection refused",
+    "Address not available",
+    "Already connected",
+    "Connection aborted",
+    "Connection already in progress",
+    "Connection reset",
+    "Destination address required",
+    "Host unreachable",
+    "Illegal byte sequence",
+    "Message size",
+    "Network down",
+    "Network unreachable",
+    "Network reset",
+    "No buffer space",
+    "No lock available",
+    "No message",
+    "No protocol option",
+    "Not connected",
+    "Operation would block",
+    "Protocol not supported",
+    "Resource deadlock would occur",
+    "Timed out",
+    "Wrong protocol type",
+    "Operation in progress",
+    "No such thread",
+    "Protocol error",
+    "Not supported",
+    "Protocol family not supported",
+    "Cannot make directory a subdirectory of itself",
+    "The highest errno +1 :^)",
+};
+
+int sys_nerr = EMAXERRNO;
+
+char* strerror(int errnum)
+{
+    if (errnum < 0 || errnum >= EMAXERRNO) {
+        printf("strerror() missing string for errnum=%d\n", errnum);
+        return const_cast<char*>("Unknown error");
+    }
+    return const_cast<char*>(sys_errlist[errnum]);
+}
+
+char* strsignal(int signum)
+{
+    if (signum >= NSIG) {
+        printf("strsignal() missing string for signum=%d\n", signum);
+        return const_cast<char*>("Unknown signal");
+    }
+    return const_cast<char*>(sys_siglist[signum]);
+}
+
+char* strstr(const char* haystack, const char* needle)
+{
+    char nch;
+    char hch;
+
+    if ((nch = *needle++) != 0) {
+        size_t len = strlen(needle);
+        do {
+            do {
+                if ((hch = *haystack++) == 0)
+                    return nullptr;
+            } while (hch != nch);
+        } while (strncmp(haystack, needle, len) != 0);
+        --haystack;
+    }
+    return const_cast<char*>(haystack);
+}
+
+char* strpbrk(const char* s, const char* accept)
+{
+    while (*s)
+        if (strchr(accept, *s++))
+            return const_cast<char*>(--s);
+    return nullptr;
+}
+
+char* strtok_r(char* str, const char* delim, char** saved_str)
+{
+    if (!str) {
+        if (!saved_str)
+            return nullptr;
+        str = *saved_str;
+    }
+
+    size_t token_start = 0;
+    size_t token_end = 0;
+    size_t str_len = strlen(str);
+    size_t delim_len = strlen(delim);
+
+    for (size_t i = 0; i < str_len; ++i) {
+        bool is_proper_delim = false;
+
+        for (size_t j = 0; j < delim_len; ++j) {
+            if (str[i] == delim[j]) {
+                // Skip beginning delimiters
+                if (token_end - token_start == 0) {
+                    ++token_start;
+                    break;
+                }
+
+                is_proper_delim = true;
+            }
+        }
+
+        ++token_end;
+        if (is_proper_delim && token_end > 0) {
+            --token_end;
+            break;
+        }
+    }
+
+    if (str[token_start] == '\0')
+        return nullptr;
+
+    if (token_end == 0) {
+        *saved_str = nullptr;
+        return &str[token_start];
+    }
+
+    if (str[token_end] == '\0')
+        *saved_str = &str[token_end];
+    else
+        *saved_str = &str[token_end + 1];
+
+    str[token_end] = '\0';
+    return &str[token_start];
+}
+
+char* strtok(char* str, const char* delim)
+{
+    static char* saved_str;
+    return strtok_r(str, delim, &saved_str);
+}
+
+int strcoll(const char* s1, const char* s2)
+{
+    return strcmp(s1, s2);
+}
+
+size_t strxfrm(char* dest, const char* src, size_t n)
+{
+    size_t i;
+    for (i = 0; i < n && src[i] != '\0'; ++i)
+        dest[i] = src[i];
+    for (; i < n; ++i)
+        dest[i] = '\0';
+    return i;
+}
+
+void explicit_bzero(void* ptr, size_t size)
+{
+    memset(ptr, 0, size);
+    asm volatile("" ::
+                     : "memory");
+}
+}

Userland/Libraries/LibC/string.h

@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+size_t strlen(const char*);
+size_t strnlen(const char*, size_t maxlen);
+
+int strcmp(const char*, const char*);
+int strncmp(const char*, const char*, size_t);
+
+int memcmp(const void*, const void*, size_t);
+void* memcpy(void*, const void*, size_t);
+void* memmove(void*, const void*, size_t);
+void* memchr(const void*, int c, size_t);
+const void* memmem(const void* haystack, size_t, const void* needle, size_t);
+
+void* memset(void*, int, size_t);
+void explicit_bzero(void*, size_t) __attribute__((nonnull(1)));
+
+__attribute__((malloc)) char* strdup(const char*);
+__attribute__((malloc)) char* strndup(const char*, size_t);
+
+__attribute__((deprecated("use strlcpy or String::copy_characters_to_buffer"))) char* strcpy(char* dest, const char* src);
+__attribute__((deprecated("use strlcpy or String::copy_characters_to_buffer"))) char* strncpy(char* dest, const char* src, size_t);
+__attribute__((warn_unused_result)) size_t strlcpy(char* dest, const char* src, size_t);
+
+char* strchr(const char*, int c);
+char* strchrnul(const char*, int c);
+char* strstr(const char* haystack, const char* needle);
+char* strrchr(const char*, int c);
+
+__attribute__((deprecated("use strncat"))) char* strcat(char* dest, const char* src);
+char* strncat(char* dest, const char* src, size_t);
+
+size_t strspn(const char*, const char* accept);
+size_t strcspn(const char*, const char* reject);
+char* strerror(int errnum);
+char* strsignal(int signum);
+char* strpbrk(const char*, const char* accept);
+char* strtok_r(char* str, const char* delim, char** saved_str);
+char* strtok(char* str, const char* delim);
+int strcoll(const char* s1, const char* s2);
+size_t strxfrm(char* dest, const char* src, size_t n);
+
+__END_DECLS

Userland/Libraries/LibC/strings.cpp

@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <assert.h>
+#include <ctype.h>
+#include <string.h>
+#include <strings.h>
+
+extern "C" {
+
+void bzero(void* dest, size_t n)
+{
+    memset(dest, 0, n);
+}
+
+void bcopy(const void* src, void* dest, size_t n)
+{
+    memmove(dest, src, n);
+}
+
+static char foldcase(char ch)
+{
+    if (isalpha(ch))
+        return tolower(ch);
+    return ch;
+}
+
+int strcasecmp(const char* s1, const char* s2)
+{
+    for (; foldcase(*s1) == foldcase(*s2); ++s1, ++s2) {
+        if (*s1 == 0)
+            return 0;
+    }
+    return foldcase(*(const unsigned char*)s1) < foldcase(*(const unsigned char*)s2) ? -1 : 1;
+}
+
+int strncasecmp(const char* s1, const char* s2, size_t n)
+{
+    if (!n)
+        return 0;
+    do {
+        if (foldcase(*s1) != foldcase(*s2++))
+            return foldcase(*(const unsigned char*)s1) - foldcase(*(const unsigned char*)--s2);
+        if (*s1++ == 0)
+            break;
+    } while (--n);
+    return 0;
+}
+}

Userland/Libraries/LibC/strings.h

@@ -0,0 +1,39 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+int strcasecmp(const char*, const char*);
+int strncasecmp(const char*, const char*, size_t);
+void bzero(void*, size_t);
+void bcopy(const void*, void*, size_t);
+
+__END_DECLS

Userland/Libraries/LibC/sys/arch/i386/regs.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2020, Itamar S. <itamar8910@gmail.com>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <AK/Types.h>
+
+struct [[gnu::packed]] PtraceRegisters {
+    u32 eax;
+    u32 ecx;
+    u32 edx;
+    u32 ebx;
+    u32 esp;
+    u32 ebp;
+    u32 esi;
+    u32 edi;
+    u32 eip;
+    u32 eflags;
+    u32 cs;
+    u32 ss;
+    u32 ds;
+    u32 es;
+    u32 fs;
+    u32 gs;
+};

Userland/Libraries/LibC/sys/cdefs.h

@@ -0,0 +1,54 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#define _POSIX_VERSION 200809L
+
+#ifndef ALWAYS_INLINE
+#    define ALWAYS_INLINE inline __attribute__((always_inline))
+#endif
+
+#ifdef __cplusplus
+#    ifndef __BEGIN_DECLS
+#        define __BEGIN_DECLS extern "C" {
+#        define __END_DECLS }
+#    endif
+#else
+#    ifndef __BEGIN_DECLS
+#        define __BEGIN_DECLS
+#        define __END_DECLS
+#    endif
+#endif
+
+#undef __P
+#define __P(a) a
+
+#define offsetof(type, member) __builtin_offsetof(type, member)
+
+#ifdef __cplusplus
+//extern "C" int main(int, char**);
+#endif

Userland/Libraries/LibC/sys/file.h

@@ -0,0 +1,27 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once

Userland/Libraries/LibC/sys/internals.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright (c) 2020, the SerenityOS developers.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+typedef void (*AtExitFunction)(void*);
+
+extern void __libc_init();
+extern void __malloc_init();
+extern void __stdio_init();
+extern void _init();
+extern bool __environ_is_malloced;
+extern bool __stdio_is_initialized;
+
+int __cxa_atexit(AtExitFunction exit_function, void* parameter, void* dso_handle);
+void __cxa_finalize(void* dso_handle);
+[[noreturn]] void __cxa_pure_virtual() __attribute__((weak));
+[[noreturn]] void __stack_chk_fail();
+[[noreturn]] void __stack_chk_fail_local();
+
+__END_DECLS

Userland/Libraries/LibC/sys/ioctl.h

@@ -0,0 +1,36 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/ioctl_numbers.h>
+
+__BEGIN_DECLS
+
+int ioctl(int fd, unsigned request, ...);
+
+__END_DECLS

Userland/Libraries/LibC/sys/ioctl_numbers.h

@@ -0,0 +1,94 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+
+__BEGIN_DECLS
+
+struct winsize {
+    unsigned short ws_row;
+    unsigned short ws_col;
+    unsigned short ws_xpixel;
+    unsigned short ws_ypixel;
+};
+
+struct FBResolution {
+    unsigned pitch;
+    unsigned width;
+    unsigned height;
+};
+
+__END_DECLS
+
+enum IOCtlNumber {
+    TIOCGPGRP,
+    TIOCSPGRP,
+    TCGETS,
+    TCSETS,
+    TCSETSW,
+    TCSETSF,
+    TCFLSH,
+    TIOCGWINSZ,
+    TIOCSCTTY,
+    TIOCNOTTY,
+    TIOCSWINSZ,
+    FB_IOCTL_GET_SIZE_IN_BYTES,
+    FB_IOCTL_GET_RESOLUTION,
+    FB_IOCTL_SET_RESOLUTION,
+    FB_IOCTL_GET_BUFFER,
+    FB_IOCTL_SET_BUFFER,
+    SIOCSIFADDR,
+    SIOCGIFADDR,
+    SIOCGIFHWADDR,
+    SIOCSIFNETMASK,
+    SIOCADDRT,
+    SIOCDELRT
+};
+
+#define TIOCGPGRP TIOCGPGRP
+#define TIOCSPGRP TIOCSPGRP
+#define TCGETS TCGETS
+#define TCSETS TCSETS
+#define TCSETSW TCSETSW
+#define TCSETSF TCSETSF
+#define TCFLSH TCFLSH
+#define TIOCGWINSZ TIOCGWINSZ
+#define TIOCSCTTY TIOCSCTTY
+#define TIOCNOTTY TIOCNOTTY
+#define TIOCSWINSZ TIOCSWINSZ
+#define FB_IOCTL_GET_SIZE_IN_BYTES FB_IOCTL_GET_SIZE_IN_BYTES
+#define FB_IOCTL_GET_RESOLUTION FB_IOCTL_GET_RESOLUTION
+#define FB_IOCTL_SET_RESOLUTION FB_IOCTL_SET_RESOLUTION
+#define FB_IOCTL_GET_BUFFER FB_IOCTL_GET_BUFFER
+#define FB_IOCTL_SET_BUFFER FB_IOCTL_SET_BUFFER
+#define SIOCSIFADDR SIOCSIFADDR
+#define SIOCGIFADDR SIOCGIFADDR
+#define SIOCGIFHWADDR SIOCGIFHWADDR
+#define SIOCSIFNETMASK SIOCSIFNETMASK
+#define SIOCADDRT SIOCADDRT
+#define SIOCDELRT SIOCDELRT

Userland/Libraries/LibC/sys/mman.h

@@ -0,0 +1,29 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <mman.h>

Userland/Libraries/LibC/sys/param.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2018-2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <endian.h>
+#include <limits.h>

Userland/Libraries/LibC/sys/prctl.cpp

@@ -0,0 +1,40 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <Kernel/API/Syscall.h>
+#include <errno.h>
+#include <stdarg.h>
+#include <stdio.h>
+#include <sys/prctl.h>
+
+extern "C" {
+
+int prctl(int option, uintptr_t arg1, uintptr_t arg2)
+{
+    int rc = syscall(SC_prctl, option, arg1, arg2);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+}

Userland/Libraries/LibC/sys/prctl.h

@@ -0,0 +1,37 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#include <sys/cdefs.h>
+#include <sys/prctl_numbers.h>
+#include <sys/types.h>
+
+__BEGIN_DECLS
+
+int prctl(int option, uintptr_t arg1, uintptr_t arg2);
+
+__END_DECLS

Userland/Libraries/LibC/sys/prctl_numbers.h

@@ -0,0 +1,30 @@
+/*
+ * Copyright (c) 2020, Andreas Kling <kling@serenityos.org>
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright notice, this
+ *    list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright notice,
+ *    this list of conditions and the following disclaimer in the documentation
+ *    and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
+ * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
+ * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
+ * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#pragma once
+
+#define PR_SET_DUMPABLE 1
+#define PR_GET_DUMPABLE 2