tests/test-time.c

   1 /* Test of time() function.
   2    Copyright (C) 2023-2024 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 Bruno Haible.  */
  18
  19 #include <config.h>
  20
  21 #include <time.h>
  22
  23 #include "signature.h"
  24 SIGNATURE_CHECK (time, time_t, (time_t *));
  25
  26 #include <sys/time.h>
  27
  28 #include "macros.h"
  29
  30 int
  31 main (void)
  32 {
  33   /* Check consistency of time() with gettimeofday().tv_sec.  */
  34   struct timeval tv1;
  35   struct timeval tv2;
  36   time_t tt3;
  37
  38   /* Wait until gettimeofday() reports an increase in tv_sec.  */
  39   ASSERT (gettimeofday (&tv1, NULL) == 0);
  40   do
  41     ASSERT (gettimeofday (&tv2, NULL) == 0);
  42   while (tv2.tv_sec == tv1.tv_sec);
  43   /* We are now at the beginning of a second.  Test whether time() reports
  44      the new second or the previous one.  */
  45   tt3 = time (NULL);
  46   ASSERT (tt3 >= tv2.tv_sec);
  47
  48   return test_exit_status;
  49 }