tests/test-timespec_get.c

   1 /* Test of timespec_get() function.
   2    Copyright (C) 2021-2025 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 Bruno Haible.  */
  18
  19 #include <config.h>
  20
  21 #include <time.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (timespec_get, int, (struct timespec *ts, int base));
  25
  26 #include "macros.h"
  27
  28 int
  29 main (void)
  30 {
  31   struct timespec ts1;
  32   time_t tt2;
  33   struct timespec ts3;
  34   time_t tt4;
  35
  36   ASSERT (timespec_get (&ts1, TIME_UTC));
  37   tt2 = time (NULL);
  38   ASSERT (timespec_get (&ts3, TIME_UTC));
  39   tt4 = time (NULL);
  40
  41   /* Verify monotonicity of timespec_get().  */
  42   ASSERT (ts1.tv_sec < ts3.tv_sec
  43           || (ts1.tv_sec == ts3.tv_sec && ts1.tv_nsec <= ts3.tv_nsec));
  44
  45   /* Verify monotonicity of time().  */
  46   ASSERT (tt2 <= tt4);
  47
  48   /* Verify that the tv_sec field of the result is the same as time(NULL).  */
  49   /* Note: It's here that the dependency to the 'time' module is needed.
  50      Without it, this assertion would sometimes fail on glibc systems, see
  51      https://sourceware.org/bugzilla/show_bug.cgi?id=30200  */
  52   ASSERT (ts1.tv_sec <= tt2);
  53   ASSERT (tt2 <= ts3.tv_sec);
  54   ASSERT (ts3.tv_sec <= tt4);
  55
  56   return test_exit_status;
  57 }