Kernel/LibC: Implement utime* family functions

This patch adds *working*
 - utime
 - utimes
 - utimensat
 - futimens

userspace/libraries/LibC/include/sys/syscall.h

@@ -94,6 +94,7 @@ __BEGIN_DECLS
 	O(SYS_FSYNC,			fsync)			\
 	O(SYS_SYMLINKAT,		symlinkat)		\
 	O(SYS_HARDLINKAT,		hardlinkat)		\
+	O(SYS_UTIMENSAT,		utimensat)		\
 	O(SYS_YIELD,			yield)			\
 	O(SYS_SET_TLS,			set_tls)		\
 	O(SYS_GET_TLS,			get_tls)		\

userspace/libraries/LibC/sys/stat.cpp

@@ -53,3 +53,13 @@ int mkdir(const char* path, mode_t mode)
 {
 	return syscall(SYS_CREATE_DIR, path, __UMASKED_MODE(mode));
 }
+
+int futimens(int fd, const struct timespec times[2])
+{
+	return utimensat(fd, nullptr, times, 0);
+}
+
+int utimensat(int fd, const char* path, const struct timespec times[2], int flag)
+{
+	return syscall(SYS_UTIMENSAT, fd, path, times, flag);
+}

userspace/libraries/LibC/sys/time.cpp

@@ -1,3 +1,4 @@
+#include <fcntl.h>
 #include <sys/syscall.h>
 #include <sys/time.h>
 #include <time.h>
@@ -26,3 +27,20 @@ int setitimer(int which, const struct itimerval* __restrict value, struct itimer
 {
 	return syscall(SYS_SETITIMER, which, value, ovalue);
 }
+
+int utimes(const char* path, const struct timeval times[2])
+{
+	if (times == nullptr)
+		return utimensat(AT_FDCWD, path, nullptr, 0);
+	const timespec times_ts[2] {
+		timespec {
+			.tv_sec = times[0].tv_sec,
+			.tv_nsec = times[0].tv_usec * 1000,
+		},
+		timespec {
+			.tv_sec = times[1].tv_sec,
+			.tv_nsec = times[1].tv_usec * 1000,
+		},
+	};
+	return utimensat(AT_FDCWD, path, times_ts, 0);
+}

userspace/libraries/LibC/utime.cpp

@@ -1,11 +1,20 @@
-#include <utime.h>
+#include <fcntl.h>
 #include <sys/stat.h>
-#include <stdio.h>
+#include <utime.h>
 
 int utime(const char* filename, const struct utimbuf* times)
 {
-	fprintf(stddbg, "TODO: utime(\"%s\", %p)\n", filename, times);
-
-	struct stat st;
-	return stat(filename, &st);
+	if (times == nullptr)
+		return utimensat(AT_FDCWD, filename, nullptr, 0);
+	const timespec times_ts[2] {
+		timespec {
+			.tv_sec = times->actime,
+			.tv_nsec = 0,
+		},
+		timespec {
+			.tv_sec = times->modtime,
+			.tv_nsec = 0,
+		},
+	};
+	return utimensat(AT_FDCWD, filename, times_ts, 0);
 }