diff --git a/LibC/Makefile b/LibC/Makefile
index ba3a69695b..471e70c205 100644
--- a/LibC/Makefile
+++ b/LibC/Makefile
@@ -40,6 +40,7 @@ LIBC_OBJS = \
        poll.o \
        locale.o \
        arpa/inet.o \
+       netdb.o \
        crt0.o
 
 ASM_OBJS = setjmp.no
diff --git a/LibC/arpa/inet.cpp b/LibC/arpa/inet.cpp
index a85ee697a7..790b9eb715 100644
--- a/LibC/arpa/inet.cpp
+++ b/LibC/arpa/inet.cpp
@@ -1,4 +1,5 @@
 #include <arpa/inet.h>
+#include <netinet/in.h>
 #include <stdio.h>
 #include <errno.h>
 
@@ -47,5 +48,14 @@ int inet_pton(int af, const char* src, void* dst)
     return 0;
 }
 
+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;
+}
+
 }
 
diff --git a/LibC/netdb.cpp b/LibC/netdb.cpp
new file mode 100644
index 0000000000..3be3bc868e
--- /dev/null
+++ b/LibC/netdb.cpp
@@ -0,0 +1,31 @@
+#include <netdb.h>
+#include <stdio.h>
+#include <string.h>
+#include <arpa/inet.h>
+#include <netinet/in.h>
+
+extern "C" {
+
+static hostent __gethostbyname_buffer;
+static in_addr_t __gethostbyname_address;
+static in_addr_t* __gethostbyname_address_list_buffer[2];
+
+hostent* gethostbyname(const char* name)
+{
+    if (!strcmp(name, "boards.4channel.org")) {
+        __gethostbyname_buffer.h_name = "boards.4channel.org";
+        __gethostbyname_buffer.h_aliases = nullptr;
+        __gethostbyname_buffer.h_addrtype = AF_INET;
+        __gethostbyname_address = 0x4b4f1168;
+        __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;
+    }
+    dbgprintf("FIXME(LibC): gethostbyname(%s)\n", name);
+    return nullptr;
+}
+
+}
+
diff --git a/LibC/netdb.h b/LibC/netdb.h
new file mode 100644
index 0000000000..727c212e9a
--- /dev/null
+++ b/LibC/netdb.h
@@ -0,0 +1,18 @@
+#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;
+};
+
+struct hostent *gethostbyname(const char*);
+
+__END_DECLS
diff --git a/LibC/netinet/in.h b/LibC/netinet/in.h
index 2eef065265..f0a59de8be 100644
--- a/LibC/netinet/in.h
+++ b/LibC/netinet/in.h
@@ -6,7 +6,9 @@
 __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)
 
 __END_DECLS
diff --git a/LibC/stdio.cpp b/LibC/stdio.cpp
index 33eaff3123..2b8e9186bf 100644
--- a/LibC/stdio.cpp
+++ b/LibC/stdio.cpp
@@ -351,8 +351,20 @@ void perror(const char* s)
 
 FILE* fopen(const char* pathname, const char* mode)
 {
-    assert(!strcmp(mode, "r") || !strcmp(mode, "rb"));
-    int fd = open(pathname, O_RDONLY);
+    int flags = 0;
+    if (!strcmp(mode, "r") || !strcmp(mode, "rb"))
+        flags = O_RDONLY;
+    else if (!strcmp(mode, "r+") || !strcmp(mode, "rb+"))
+        flags = O_RDWR;
+    else if (!strcmp(mode, "w") || !strcmp(mode, "wb"))
+        flags = O_WRONLY | O_CREAT | O_TRUNC;
+    else if (!strcmp(mode, "w+") || !strcmp(mode, "wb+"))
+        flags = O_RDWR | O_CREAT | O_TRUNC;
+    else {
+        fprintf(stderr, "FIXME(LibC): fopen('%s', '%s')\n", pathname, mode);
+        ASSERT_NOT_REACHED();
+    }
+    int fd = open(pathname, flags, 0666);
     if (fd < 0)
         return nullptr;
     return make_FILE(fd);
@@ -368,7 +380,7 @@ FILE* freopen(const char* pathname, const char* mode, FILE* stream)
 
 FILE* fdopen(int fd, const char* mode)
 {
-    assert(!strcmp(mode, "r") || !strcmp(mode, "rb"));
+    // FIXME: Verify that the mode matches how fd is already open.
     if (fd < 0)
         return nullptr;
     return make_FILE(fd);
@@ -404,5 +416,13 @@ int pclose(FILE*)
     assert(false);
 }
 
+int remove(const char* pathname)
+{
+    int rc = unlink(pathname);
+    if (rc < 0 && errno != EISDIR)
+        return -1;
+    return rmdir(pathname);
+}
+
 }
 
diff --git a/LibC/stdlib.cpp b/LibC/stdlib.cpp
index 8d0b9aa153..68281627cc 100644
--- a/LibC/stdlib.cpp
+++ b/LibC/stdlib.cpp
@@ -161,6 +161,8 @@ void* calloc(size_t count, size_t size)
 
 void* realloc(void *ptr, size_t size)
 {
+    if (!ptr)
+        return malloc(size);
     validate_mallocation(ptr, "realloc()");
     auto* header = (MallocHeader*)((((byte*)ptr) - sizeof(MallocHeader)));
     size_t old_size = header->size;
@@ -288,6 +290,12 @@ long atol(const char* str)
     return atoi(str);
 }
 
+long long atoll(const char* str)
+{
+    dbgprintf("FIXME(Libc): atoll('%s') passing through to atol()\n", str);
+    return atol(str);
+}
+
 static char ptsname_buf[32];
 char* ptsname(int fd)
 {
@@ -335,9 +343,32 @@ int system(const char* command)
     return execl("/bin/sh", "sh", "-c", command, nullptr);
 }
 
-char* mktemp(char*)
+char* mktemp(char* pattern)
 {
-    ASSERT_NOT_REACHED();
+    int length = strlen(pattern);
+
+    // FIXME: Check for an invalid template pattern and return EINVAL.
+    if (length < 6) {
+        pattern[0] = '\0';
+        errno = EINVAL;
+        return pattern;
+    }
+
+    int start = length - 6;
+
+    static constexpr char random_characters[] = "abcdefghijklmnopqrstuvwxyz0123456789";
+
+    for (int attempt = 0; attempt < 100; ++attempt) {
+        for (int i = 0; i < 6; ++i)
+            pattern[start + i] = random_characters[(rand() % sizeof(random_characters))];
+        struct stat st;
+        int rc = lstat(pattern, &st);
+        if (rc < 0 && errno == ENOENT)
+            return pattern;
+    }
+    pattern[0] = '\0';
+    errno = EEXIST;
+    return pattern;
 }
 
 void* bsearch(const void* key, const void* base, size_t nmemb, size_t size, int (*compar)(const void *, const void *))
diff --git a/LibC/stdlib.h b/LibC/stdlib.h
index a5d2069ba1..cd5ff2c297 100644
--- a/LibC/stdlib.h
+++ b/LibC/stdlib.h
@@ -18,6 +18,7 @@ char* getenv(const char* name);
 int putenv(char*);
 int atoi(const char*);
 long atol(const char*);
+long long atoll(const char*);
 double strtod(const char*, char** endptr);
 long strtol(const char*, char** endptr, int base);
 unsigned long strtoul(const char*, char** endptr, int base);
diff --git a/LibC/unistd.cpp b/LibC/unistd.cpp
index fe9ade86b8..de24904dd0 100644
--- a/LibC/unistd.cpp
+++ b/LibC/unistd.cpp
@@ -26,6 +26,11 @@ pid_t fork()
     __RETURN_WITH_ERRNO(rc, rc, -1);
 }
 
+int execv(const char* path, char* const argv[])
+{
+    return execve(path, argv, nullptr);
+}
+
 int execve(const char* filename, char* const argv[], char* const envp[])
 {
     int rc = syscall(SC_execve, filename, argv, envp);
diff --git a/LibC/unistd.h b/LibC/unistd.h
index a5ce7936fe..7d33acd22a 100644
--- a/LibC/unistd.h
+++ b/LibC/unistd.h
@@ -22,6 +22,7 @@ int get_shared_buffer_size(int shared_buffer_id);
 int read_tsc(unsigned* lsw, unsigned* msw);
 inline int getpagesize() { return 4096; }
 pid_t fork();
+int execv(const char* path, char* const argv[]);
 int execve(const char* filename, char* const argv[], char* const envp[]);
 int execvp(const char* filename, char* const argv[]);
 int execl(const char* filename, const char* arg, ...);