Add gettimeofday() syscall and LibC wrappers gettimeofday() and time().

This only has second accuracy right now, I'll work out subseconds later.

LibC/Makefile

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

LibC/time.cpp

@@ -0,0 +1,21 @@
+#include "time.h"
+#include "errno.h"
+#include <Kernel/Syscall.h>
+
+extern "C" {
+
+time_t time(time_t* tloc)
+{
+    timeval tv;
+    if (gettimeofday(&tv) < 0)
+        return (time_t)-1;
+    return tv.tv_sec;
+}
+
+int gettimeofday(timeval* tv)
+{
+    int rc = Syscall::invoke(Syscall::PosixGettimeofday, (dword)tv);
+    __RETURN_WITH_ERRNO(rc, rc, -1);
+}
+
+}

LibC/time.h

@@ -0,0 +1,11 @@
+#pragma once
+
+#include "types.h"
+
+extern "C" {
+
+int gettimeofday(timeval*);
+time_t time(time_t*);
+
+}
+

LibC/types.h

@@ -26,6 +26,12 @@ typedef dword nlink_t;
 typedef dword blksize_t;
 typedef dword blkcnt_t;
 typedef dword time_t;
+typedef dword suseconds_t;
+
+struct timeval {
+    time_t tv_sec;
+    suseconds_t tv_usec;
+};
 
 struct stat {
     dev_t     st_dev;     /* ID of device containing file */