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/* $Id: time-1.c $ */
/** @file
* Query the time and check that it always goes forward, POSIX only.
*/
/*
* Copyright (C) 2011-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include <stdio.h>
#include <time.h>
#include <sys/time.h>
int main()
{
unsigned cErrors = 0;
#ifdef USE_CLOCK_MONOTONIC
struct timespec aTs[2];
struct timespec *pCur = &aTs[0];
struct timespec *pPrev = &aTs[1];
struct timespec *pTmp;
#else
struct timeval aTv[2];
struct timeval *pCur = &aTv[0];
struct timeval *pPrev = &aTv[1];
struct timeval *pTmp;
#endif
#ifdef USE_CLOCK_MONOTONIC
clock_gettime(CLOCK_MONOTONIC, pPrev);
#else
gettimeofday(pPrev, NULL);
#endif
for (;;)
{
#ifdef USE_CLOCK_MONOTONIC
clock_gettime(CLOCK_MONOTONIC, pCur);
#else
gettimeofday(pCur, NULL);
#endif
if ( pCur->tv_sec == pPrev->tv_sec
#ifdef USE_CLOCK_MONOTONIC
&& pCur->tv_nsec < pPrev->tv_nsec
#else
&& pCur->tv_usec < pPrev->tv_usec
#endif
)
{
#ifdef USE_CLOCK_MONOTONIC
printf("tv_nsec in the past: %ld.%09u < %ld.%09u - %u nsec\n",
(long)pCur->tv_sec, (unsigned)pCur->tv_nsec,
(long)pPrev->tv_sec, (unsigned)pPrev->tv_nsec,
(unsigned)pPrev->tv_nsec - (unsigned)pCur->tv_nsec);
#else
printf("tv_usec in the past: %ld.%06u < %ld.%06u - %u usec\n",
(long)pCur->tv_sec, (unsigned)pCur->tv_usec,
(long)pPrev->tv_sec, (unsigned)pPrev->tv_usec,
(unsigned)pPrev->tv_usec - (unsigned)pCur->tv_usec);
#endif
cErrors++;
if (cErrors > 1000)
break;
}
else if (pCur->tv_sec < pPrev->tv_sec)
{
#ifdef USE_CLOCK_MONOTONIC
printf("tv_sec in the past: %ld.%09u < %ld.%09u\n",
(long)pCur->tv_sec, (unsigned)pCur->tv_nsec,
(long)pPrev->tv_sec, (unsigned)pPrev->tv_nsec);
#else
printf("tv_sec in the past: %ld.%06u < %ld.%06u\n",
(long)pCur->tv_sec, (unsigned)pCur->tv_usec,
(long)pPrev->tv_sec, (unsigned)pPrev->tv_usec);
#endif
cErrors++;
if (cErrors > 1000)
break;
}
else
{
/* swap */
pTmp = pPrev;
pPrev = pCur;
pCur = pTmp;
}
}
return 1;
}
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