1 /* Check if stat supports nanosecond resolution.
2 Copyright (C) 2021-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
21 #include <support/check.h>
22 #include <support/support.h>
23 #include <support/timespec.h>
26 #include <sys/types.h>
30 support_stat_nanoseconds (const char *path
)
34 /* Obtain the original timestamp to restore at the end. */
36 TEST_VERIFY_EXIT (stat (path
, &ost
) == 0);
38 const struct timespec tsp
[] = { { 0, TIMESPEC_HZ
- 1 },
39 { 0, TIMESPEC_HZ
/ 2 } };
40 TEST_VERIFY_EXIT (utimensat (AT_FDCWD
, path
, tsp
, 0) == 0);
43 TEST_VERIFY_EXIT (stat (path
, &st
) == 0);
45 support
= st
.st_atim
.tv_nsec
== tsp
[0].tv_nsec
46 && st
.st_mtim
.tv_nsec
== tsp
[1].tv_nsec
;
48 /* Reset to original timestamps. */
49 const struct timespec otsp
[] =
51 { ost
.st_atim
.tv_sec
, ost
.st_atim
.tv_nsec
},
52 { ost
.st_mtim
.tv_sec
, ost
.st_mtim
.tv_nsec
},
54 TEST_VERIFY_EXIT (utimensat (AT_FDCWD
, path
, otsp
, 0) == 0);