Blame gnulib-tests/test-gettimeofday.c

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/*
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 * Copyright (C) 2005, 2007, 2009-2017 Free Software Foundation, Inc.
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 * Written by Jim Meyering.
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 *
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 * This program is free software: you can redistribute it and/or modify
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 * it under the terms of the GNU General Public License as published by
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 * the Free Software Foundation; either version 3 of the License, or
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 * (at your option) any later version.
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 *
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 * This program is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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 * GNU General Public License for more details.
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 *
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 * You should have received a copy of the GNU General Public License
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 * along with this program.  If not, see <http://www.gnu.org/licenses/>.  */
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#include <config.h>
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#include <sys/time.h>
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#include "signature.h"
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SIGNATURE_CHECK (gettimeofday, int,
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                 (struct timeval *, GETTIMEOFDAY_TIMEZONE *));
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#include <time.h>
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#include <stdio.h>
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#include <string.h>
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int
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main (void)
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{
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  time_t t = 0;
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  struct tm *lt;
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  struct tm saved_lt;
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  struct timeval tv;
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  lt = localtime (&t);
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  saved_lt = *lt;
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  gettimeofday (&tv, NULL);
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  if (memcmp (lt, &saved_lt, sizeof (struct tm)) != 0)
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    {
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      fprintf (stderr, "gettimeofday still clobbers the localtime buffer!\n");
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      return 1;
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    }
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  return 0;
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}