tests/test-gettimeofday.c

   1 /*
   2  * Copyright (C) 2005, 2007, 2009-2020 Free Software Foundation, Inc.
   3  * Written by Jim Meyering.
   4  *
   5  * This program is free software: you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License as published by
   7  * the Free Software Foundation; either version 3 of the License, or
   8  * (at your option) any later version.
   9  *
  10  * This program 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
  13  * GNU General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU General Public License
  16  * along with this program.  If not, see <https://www.gnu.org/licenses/>.  */
  17
  18 #include <config.h>
  19
  20 #include <sys/time.h>
  21
  22 #include "signature.h"
  23 SIGNATURE_CHECK (gettimeofday, int,
  24                  (struct timeval *, GETTIMEOFDAY_TIMEZONE *));
  25
  26 #include <time.h>
  27
  28 #include <stdio.h>
  29 #include <string.h>
  30
  31 int
  32 main (void)
  33 {
  34   time_t t = 0;
  35   struct tm *lt;
  36   struct tm saved_lt;
  37   struct timeval tv;
  38   lt = localtime (&t);
  39   saved_lt = *lt;
  40   gettimeofday (&tv, NULL);
  41   if (memcmp (lt, &saved_lt, sizeof (struct tm)) != 0)
  42     {
  43       fprintf (stderr, "gettimeofday still clobbers the localtime buffer!\n");
  44       return 1;
  45     }
  46   return 0;
  47 }