Add sys$uname() and a /bin/uname utility.

LibC/Makefile

@@ -7,6 +7,7 @@ OBJS = \
        dirent.o \
        stdlib.o \
        time.o \
+       utsname.o \
        entry.o
 
 LIBRARY = LibC.a

LibC/stdio.cpp

@@ -1,6 +1,8 @@
 #include "stdio.h"
 #include "stdarg.h"
 #include "types.h"
+#include "string.h"
+#include "errno.h"
 #include <Kernel/Syscall.h>
 
 #define ALWAYS_INLINE __attribute__ ((always_inline))
@@ -169,5 +171,10 @@ int sprintf(char* buffer, const char* fmt, ...)
     return ret;
 }
 
+void perror(const char* s)
+{
+    printf("%s: %s\n", s, strerror(errno));
+}
+
 }
 

LibC/stdio.h

@@ -5,6 +5,7 @@ extern "C" {
 int printf(const char* fmt, ...);
 int sprintf(char* buffer, const char* fmt, ...);
 int putchar(int ch);
+void perror(const char*);
 
 }
 

LibC/utsname.cpp

@@ -0,0 +1,14 @@
+#include "utsname.h"
+#include "errno.h"
+#include <Kernel/Syscall.h>
+
+extern "C" {
+
+int uname(struct utsname* buf)
+{
+    int rc = Syscall::invoke(Syscall::PosixUname, (dword)buf);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+}
+

LibC/utsname.h

@@ -0,0 +1,17 @@
+#pragma once
+
+#define UTSNAME_ENTRY_LEN 65
+
+extern "C" {
+
+struct utsname {
+    char sysname[UTSNAME_ENTRY_LEN];
+    char nodename[UTSNAME_ENTRY_LEN];
+    char release[UTSNAME_ENTRY_LEN];
+    char version[UTSNAME_ENTRY_LEN];
+    char machine[UTSNAME_ENTRY_LEN];
+};
+
+int uname(struct utsname*);
+
+}