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/* Check if path supports 64-bit time interfaces.
Copyright (C) 2021 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <fcntl.h>
#include <support/check.h>
#include <support/support.h>
#include <sys/stat.h>
#ifdef __linux__
#include <sysdep.h>
#endif
#ifdef __linux__
static int
utimesat_call (const char *path, const struct __timespec64 tsp[2])
{
# ifndef __NR_utimensat_time64
# define __NR_utimensat_time64 __NR_utimensat
# endif
return INLINE_SYSCALL_CALL (utimensat_time64, AT_FDCWD, path, &tsp[0], 0);
}
#endif
bool
support_path_support_time64 (const char *path)
{
#ifdef __linux__
/* Obtain the original timestamps to restore at the end. */
struct statx ostx;
TEST_VERIFY_EXIT (statx (AT_FDCWD, path, 0, STATX_BASIC_STATS, &ostx) == 0);
const struct __timespec64 tsp[] =
{
/* 1s and 2s after y2038 limit. */
{ 0x80000001ULL, 0 },
{ 0x80000002ULL, 0 }
};
/* Return is kernel does not support __NR_utimensat_time64. */
if (utimesat_call (path, tsp) == -1)
return false;
/* Verify if the last access and last modification time match the ones
obtained with statx. */
struct statx stx;
TEST_VERIFY_EXIT (statx (AT_FDCWD, path, 0, STATX_BASIC_STATS, &stx) == 0);
bool support = stx.stx_atime.tv_sec == tsp[0].tv_sec
&& stx.stx_mtime.tv_sec == tsp[1].tv_sec;
/* Reset to original timestamps. */
const struct __timespec64 otsp[] =
{
{ ostx.stx_atime.tv_sec, ostx.stx_atime.tv_nsec },
{ ostx.stx_mtime.tv_sec, ostx.stx_mtime.tv_nsec },
};
TEST_VERIFY_EXIT (utimesat_call (path, otsp) == 0);
return support;
#else
return true;
#endif
}
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