1 /* Check that clock_gettime does not clobber errno on success.
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 
19 #include <errno.h>
20 #include <time.h>
21 #include <support/check.h>
22 #include <stdio.h>
23 
24 static void
test_clock(clockid_t clk)25 test_clock (clockid_t clk)
26 {
27   printf ("info: testing clock: %d\n", (int) clk);
28 
29   for (int original_errno = 0; original_errno < 2; ++original_errno)
30     {
31       errno = original_errno;
32       struct timespec ts;
33       if (clock_gettime (clk, &ts) == 0)
34         TEST_COMPARE (errno, original_errno);
35     }
36 }
37 
38 static int
do_test(void)39 do_test (void)
40 {
41   test_clock (CLOCK_BOOTTIME);
42   test_clock (CLOCK_BOOTTIME_ALARM);
43   test_clock (CLOCK_MONOTONIC);
44   test_clock (CLOCK_MONOTONIC_COARSE);
45   test_clock (CLOCK_MONOTONIC_RAW);
46   test_clock (CLOCK_PROCESS_CPUTIME_ID);
47   test_clock (CLOCK_REALTIME);
48   test_clock (CLOCK_REALTIME_ALARM);
49   test_clock (CLOCK_REALTIME_COARSE);
50 #ifdef CLOCK_TAI
51   test_clock (CLOCK_TAI);
52 #endif
53   test_clock (CLOCK_THREAD_CPUTIME_ID);
54   return 0;
55 }
56 
57 #include <support/test-driver.c>
58