/* $Id: time-1.c 93115 2022-01-01 11:31:46Z vboxsync $ */ /** @file * Query the time and check that it always goes forward, POSIX only. */ /* * Copyright (C) 2011-2022 Oracle Corporation * * This file is part of VirtualBox Open Source Edition (OSE), as * available from http://www.virtualbox.org. This file is free software; * you can redistribute it and/or modify it under the terms of the GNU * General Public License (GPL) as published by the Free Software * Foundation, in version 2 as it comes in the "COPYING" file of the * VirtualBox OSE distribution. VirtualBox OSE is distributed in the * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind. * * The contents of this file may alternatively be used under the terms * of the Common Development and Distribution License Version 1.0 * (CDDL) only, as it comes in the "COPYING.CDDL" file of the * VirtualBox OSE 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. */ /********************************************************************************************************************************* * Header Files * *********************************************************************************************************************************/ #include #include #include 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; }