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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>
This commit is contained in:
Lukasz Majewski 2020-02-06 12:34:48 +01:00
parent 847d3913da
commit d962a5d68a
2 changed files with 29 additions and 11 deletions
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3
include/time.h
View File

@ -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);

37
sysdeps/unix/sysv/linux/utimes.c
View File

@ -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];
/* Consider moving to syscalls.list. */
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);
}
#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)