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Diffstat (limited to '')
| -rw-r--r-- | src/VBox/ValidationKit/snippets/time-1.c | 113 |
1 files changed, 113 insertions, 0 deletions
diff --git a/src/VBox/ValidationKit/snippets/time-1.c b/src/VBox/ValidationKit/snippets/time-1.c new file mode 100644 index 00000000..1922a44b --- /dev/null +++ b/src/VBox/ValidationKit/snippets/time-1.c @@ -0,0 +1,113 @@ +/* $Id: time-1.c $ */ +/** @file + * Query the time and check that it always goes forward, POSIX only. + */ + +/* + * Copyright (C) 2011-2019 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 <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; +} |