88 lines
2.3 KiB
C
88 lines
2.3 KiB
C
/*
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* Copyright (C) 2005, 2007, 2009-2025 Free Software Foundation, Inc.
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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 <https://www.gnu.org/licenses/>. */
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/* Written by Jim Meyering and Bruno Haible. */
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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 <stdlib.h>
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#include <string.h>
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#include "macros.h"
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static void
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test_clobber ()
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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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exit (1);
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}
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}
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static void
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test_consistency ()
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{
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struct timeval tv1;
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time_t tt2;
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struct timeval tv3;
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time_t tt4;
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ASSERT (gettimeofday (&tv1, NULL) == 0);
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tt2 = time (NULL);
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ASSERT (gettimeofday (&tv3, NULL) == 0);
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tt4 = time (NULL);
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/* Verify monotonicity of gettimeofday(). */
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ASSERT (tv1.tv_sec < tv3.tv_sec
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|| (tv1.tv_sec == tv3.tv_sec && tv1.tv_usec <= tv3.tv_usec));
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/* Verify monotonicity of time(). */
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ASSERT (tt2 <= tt4);
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/* Verify that the tv_sec field of the result is the same as time(NULL). */
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/* Note: It's here that the dependency to the 'time' module is needed.
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Without it, this assertion would sometimes fail on glibc systems, see
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https://sourceware.org/bugzilla/show_bug.cgi?id=30200 */
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ASSERT (tv1.tv_sec <= tt2);
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ASSERT (tt2 <= tv3.tv_sec);
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ASSERT (tv3.tv_sec <= tt4);
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}
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int
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main (void)
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{
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test_clobber ();
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test_consistency ();
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return test_exit_status;
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}
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