tests/test-timespec_getres.c

   1 /* Test timespec_getres.
   2    Copyright 2021-2024 Free Software Foundation, Inc.
   3
   4    This program is free software: you can redistribute it and/or modify
   5    it under the terms of the GNU General Public License as published by
   6    the Free Software Foundation, either version 3 of the License, or
   7    (at your option) any later version.
   8
   9    This program is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12    GNU General Public License for more details.
  13
  14    You should have received a copy of the GNU General Public License
  15    along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  16
  17 /* Written by Paul Eggert.  */
  18
  19 #include <config.h>
  20
  21 #include <time.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (timespec_getres, int, (struct timespec *ts, int base));
  25
  26 #include "macros.h"
  27
  28 int
  29 main (void)
  30 {
  31   struct timespec ts;
  32   ASSERT (timespec_getres (&ts, TIME_UTC) == TIME_UTC);
  33
  34   /* No clock resolution should be worse than 1 s or better than 1 ns.  */
  35   ASSERT (ts.tv_sec == 0
  36           ? 0 < ts.tv_nsec && ts.tv_nsec < 1000000000
  37           : ts.tv_sec == 1 && ts.tv_nsec == 0);
  38
  39   return test_exit_status;
  40 }