y2038: linux: Provide __utime64 implementation

This patch replaces auto generated wrapper (as described in
sysdeps/unix/sysv/linux/syscalls.list) for utime with one which adds extra
support for setting file's access and modification 64 bit time on machines
with __TIMESIZE != 64.

Internally, the __utimensat_time64 helper function is used. This patch is
necessary for having architectures with __WORDSIZE == 32 && __TIMESIZE != 64
Y2038 safe.

Moreover, a 32 bit version - __utime has been refactored to internally use
__utime64.
The __utime is now supposed to be used on systems still supporting 32
bit time (__TIMESIZE != 64) - hence the necessary conversion between struct
utimbuf and struct __utimbuf64.

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 __utime64 and __utime.

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 7425d16..7737be1 100644
--- a/include/time.h
+++ b/include/time.h
@@ -188,9 +188,12 @@ libc_hidden_proto (__clock_getres64);
 #endif
 
 #if __TIMESIZE == 64
+# define __utime64 __utime
 # define __utimes64 __utimes
 # define __utimensat64 __utimensat
 #else
+extern int __utime64 (const char *file, const struct __utimbuf64 *times);
+libc_hidden_proto (__utime64)
 extern int __utimes64 (const char *file, const struct __timeval64 tvp[2]);
 libc_hidden_proto (__utimes64)
 extern int __utimensat64 (int fd, const char *file,