1 | /* Basic tests for timespec_getres. |
2 | Copyright (C) 2021-2022 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 | |
19 | #include <time.h> |
20 | #include <support/check.h> |
21 | |
22 | static int |
23 | do_test (void) |
24 | { |
25 | { |
26 | struct timespec ts; |
27 | TEST_COMPARE (timespec_getres (&ts, 0), 0); |
28 | TEST_COMPARE (timespec_getres (NULL, 0), 0); |
29 | } |
30 | |
31 | { |
32 | struct timespec ts; |
33 | TEST_COMPARE (timespec_getres (&ts, TIME_UTC), TIME_UTC); |
34 | /* Expect all supported systems to support TIME_UTC with |
35 | resolution better than one second. */ |
36 | TEST_VERIFY (ts.tv_sec == 0); |
37 | TEST_VERIFY (ts.tv_nsec > 0); |
38 | TEST_VERIFY (ts.tv_nsec < 1000000000); |
39 | TEST_COMPARE (timespec_getres (NULL, TIME_UTC), TIME_UTC); |
40 | /* Expect the resolution to be the same as that reported for |
41 | CLOCK_REALTIME with clock_getres. */ |
42 | struct timespec cts; |
43 | TEST_COMPARE (clock_getres (CLOCK_REALTIME, &cts), 0); |
44 | TEST_COMPARE (ts.tv_sec, cts.tv_sec); |
45 | TEST_COMPARE (ts.tv_nsec, cts.tv_nsec); |
46 | } |
47 | |
48 | return 0; |
49 | } |
50 | |
51 | #include <support/test-driver.c> |
52 | |