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>

1 files changed, 3 insertions, 0 deletions

diff --git a/include/time.h b/include/time.h
index 0bb2bccf78..7425d16543 100644
--- a/include/time.h
+++ b/include/time.h
@@ -188,8 +188,11 @@ 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);