1  /* Test of time() function.
       2     Copyright (C) 2023 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 0;
      49  }