lutimes: add lutimes support

This patch adds lutimes library call support.

Signed-off-by: Vladimir Zapolskiy <vzapolskiy@gmail.com>
Signed-off-by: Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>

include/sys/time.h

@@ -144,14 +144,16 @@ extern int utimes (__const char *__file, __const struct timeval __tvp[2])
      __THROW __nonnull ((1));
 libc_hidden_proto(utimes)
 
-#if 0 /*def __USE_BSD*/
+#ifdef __USE_BSD
 /* Same as `utimes', but does not follow symbolic links.  */
 extern int lutimes (__const char *__file, __const struct timeval __tvp[2])
      __THROW __nonnull ((1));
 
+#if 0
 /* Same as `utimes', but takes an open file descriptor instead of a name.  */
 extern int futimes (int __fd, __const struct timeval __tvp[2]) __THROW;
 #endif
+#endif
 
 #ifdef __USE_GNU
 /* Change the access time of FILE relative to FD to TVP[0] and the

libc/sysdeps/linux/common/lutimes.c

@@ -0,0 +1,38 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * lutimes() implementation for uClibc
+ *
+ * Copyright (C) 2010 Vladimir Zapolskiy <vzapolskiy@gmail.com>
+ *
+ * Licensed under the LGPL v2.1, see the file COPYING.LIB in this tarball.
+ */
+
+#include <sys/syscall.h>
+#include <time.h>
+
+#ifdef __NR_lutimes
+_syscall2(int, lutimes, const char *, file, const struct timeval *, tvp)
+#else
+#include <sys/time.h>
+#include <fcntl.h>
+
+int lutimes(const char *file, const struct timeval tvp[2])
+{
+	struct timespec ts[2];
+
+	if (tvp != NULL)
+	{
+		if (tvp[0].tv_usec < 0 || tvp[0].tv_usec >= 1000000
+		    || tvp[1].tv_usec < 0 || tvp[1].tv_usec >= 1000000)
+		{
+			__set_errno(EINVAL);
+			return -1;
+		}
+
+		TIMEVAL_TO_TIMESPEC(&tvp[0], &ts[0]);
+		TIMEVAL_TO_TIMESPEC(&tvp[1], &ts[1]);
+	}
+
+	return utimensat(AT_FDCWD, file, tvp ? ts : NULL, AT_SYMLINK_NOFOLLOW);
+}
+#endif