y2038: linux: Provide __utimes64 implementation

This patch provides new __utimes64 explicit 64 bit function for setting file's
64 bit attributes for access and modification time.

Internally, the __utimensat64_helper function is used. This patch is necessary
for having architectures with __WORDSIZE == 32 Y2038 safe.

Moreover, a 32 bit version - __utimes has been refactored to internally use
__utimes64.

The __utimes is now supposed to be used on systems still supporting 32
bit time (__TIMESIZE != 64) - hence the necessary conversion of struct
timeval to 64 bit struct __timeval64.

Build tests:
./src/scripts/build-many-glibcs.py glibcs

Run-time tests:
- Run specific tests on ARM/x86 32bit systems (qemu):
  https://github.com/lmajewski/meta-y2038 and run tests:
  https://github.com/lmajewski/y2038-tests/commits/master

Above tests were performed with Y2038 redirection applied as well as without
to test proper usage of both __utimes64 and __utimes.

Reviewed-by: Adhemerval Zanella <adhemerval.zanella@linaro.org>

include/time.h

@@ -214,8 +214,11 @@ libc_hidden_proto (__clock_getres64);
 #endif
 
 #if __TIMESIZE == 64
+# define __utimes64 __utimes
 # define __utimensat64 __utimensat
 #else
+extern int __utimes64 (const char *file, const struct __timeval64 tvp[2]);
+libc_hidden_proto (__utimes64)
 extern int __utimensat64 (int fd, const char *file,
                           const struct __timespec64 tsp[2], int flags);
 libc_hidden_proto (__utimensat64);

sysdeps/unix/sysv/linux/utimes.c

@@ -16,22 +16,37 @@
    License along with the GNU C Library; if not, see
    <https://www.gnu.org/licenses/>.  */
 
-#include <errno.h>
-#include <stddef.h>
-#include <utime.h>
-#include <sys/time.h>
-#include <sysdep.h>
+#include <time.h>
 
+int
+__utimes64 (const char *file, const struct __timeval64 tvp[2])
+{
+  struct __timespec64 ts64[2];
+
+  if (tvp != NULL)
+    {
+      ts64[0] = timeval64_to_timespec64 (tvp[0]);
+      ts64[1] = timeval64_to_timespec64 (tvp[1]);
+    }
+
+  return __utimensat64_helper (0, file, tvp ? ts64 : NULL, 0);
+}
 
-/* Consider moving to syscalls.list.  */
+#if __TIMESIZE != 64
+libc_hidden_def (__utimes64)
 
-/* Change the access time of FILE to TVP[0] and
-   the modification time of FILE to TVP[1].  */
 int
 __utimes (const char *file, const struct timeval tvp[2])
 {
-  /* Avoid implicit array coercion in syscall macros.  */
-  return INLINE_SYSCALL (utimes, 2, file, &tvp[0]);
-}
+  struct __timeval64 tv64[2];
 
+  if (tvp != NULL)
+    {
+      tv64[0] = valid_timeval_to_timeval64 (tvp[0]);
+      tv64[1] = valid_timeval_to_timeval64 (tvp[1]);
+    }
+
+  return __utimes64 (file, tvp ? tv64 : NULL);
+}
+#endif
 weak_alias (__utimes, utimes)