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1966f47a SL |
1 | /* Check if stat supports nanosecond resolution. |
2 | Copyright (C) 2021 Free Software Foundation, Inc. | |
3 | This file is part of the GNU C Library. | |
4 | ||
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. | |
9 | ||
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. | |
14 | ||
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/>. */ | |
18 | ||
bfddda25 AZ |
19 | #include <errno.h> |
20 | #include <fcntl.h> | |
21 | #include <support/check.h> | |
22 | #include <support/support.h> | |
23 | #include <support/timespec.h> | |
1966f47a | 24 | #include <stdbool.h> |
bfddda25 AZ |
25 | #include <sys/stat.h> |
26 | #include <sys/types.h> | |
27 | #include <unistd.h> | |
1966f47a SL |
28 | |
29 | bool | |
bfddda25 | 30 | support_stat_nanoseconds (const char *path) |
1966f47a | 31 | { |
bfddda25 AZ |
32 | bool support; |
33 | #ifdef __linux__ | |
34 | /* Obtain the original timestamp to restore at the end. */ | |
35 | struct stat ost; | |
36 | TEST_VERIFY_EXIT (stat (path, &ost) == 0); | |
37 | ||
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); | |
41 | ||
42 | struct stat st; | |
43 | TEST_VERIFY_EXIT (stat (path, &st) == 0); | |
44 | ||
45 | support = st.st_atim.tv_nsec == tsp[0].tv_nsec | |
46 | && st.st_mtim.tv_nsec == tsp[1].tv_nsec; | |
47 | ||
48 | /* Reset to original timestamps. */ | |
49 | const struct timespec otsp[] = | |
50 | { | |
51 | { ost.st_atim.tv_sec, ost.st_atim.tv_nsec }, | |
52 | { ost.st_mtim.tv_sec, ost.st_mtim.tv_nsec }, | |
53 | }; | |
54 | TEST_VERIFY_EXIT (utimensat (AT_FDCWD, path, otsp, 0) == 0); | |
1966f47a | 55 | #endif |
bfddda25 | 56 | return support; |
1966f47a | 57 | } |