| 1 | /* $Id: time-1.c 98103 2023-01-17 14:15:46Z vboxsync $ */
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| 2 | /** @file
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| 3 | * Query the time and check that it always goes forward, POSIX only.
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| 4 | */
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| 5 |
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| 6 | /*
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| 7 | * Copyright (C) 2011-2023 Oracle and/or its affiliates.
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| 8 | *
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| 9 | * This file is part of VirtualBox base platform packages, as
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| 10 | * available from https://www.virtualbox.org.
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| 11 | *
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| 12 | * This program is free software; you can redistribute it and/or
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| 13 | * modify it under the terms of the GNU General Public License
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| 14 | * as published by the Free Software Foundation, in version 3 of the
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| 15 | * License.
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| 16 | *
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| 17 | * This program is distributed in the hope that it will be useful, but
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| 18 | * WITHOUT ANY WARRANTY; without even the implied warranty of
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| 19 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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| 20 | * General Public License for more details.
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| 21 | *
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| 22 | * You should have received a copy of the GNU General Public License
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| 23 | * along with this program; if not, see <https://www.gnu.org/licenses>.
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| 24 | *
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| 25 | * The contents of this file may alternatively be used under the terms
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| 26 | * of the Common Development and Distribution License Version 1.0
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| 27 | * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
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| 28 | * in the VirtualBox distribution, in which case the provisions of the
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| 29 | * CDDL are applicable instead of those of the GPL.
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| 30 | *
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| 31 | * You may elect to license modified versions of this file under the
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| 32 | * terms and conditions of either the GPL or the CDDL or both.
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| 33 | *
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| 34 | * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
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| 35 | */
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| 36 |
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| 37 |
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| 38 | /*********************************************************************************************************************************
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| 39 | * Header Files *
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| 40 | *********************************************************************************************************************************/
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| 41 | #include <stdio.h>
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| 42 | #include <time.h>
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| 43 | #include <sys/time.h>
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| 44 |
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| 45 |
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| 46 |
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| 47 | int main()
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| 48 | {
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| 49 | unsigned cErrors = 0;
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| 50 | #ifdef USE_CLOCK_MONOTONIC
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| 51 | struct timespec aTs[2];
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| 52 | struct timespec *pCur = &aTs[0];
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| 53 | struct timespec *pPrev = &aTs[1];
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| 54 | struct timespec *pTmp;
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| 55 | #else
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| 56 | struct timeval aTv[2];
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| 57 | struct timeval *pCur = &aTv[0];
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| 58 | struct timeval *pPrev = &aTv[1];
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| 59 | struct timeval *pTmp;
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| 60 | #endif
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| 61 |
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| 62 | #ifdef USE_CLOCK_MONOTONIC
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| 63 | clock_gettime(CLOCK_MONOTONIC, pPrev);
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| 64 | #else
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| 65 | gettimeofday(pPrev, NULL);
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| 66 | #endif
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| 67 | for (;;)
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| 68 | {
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| 69 | #ifdef USE_CLOCK_MONOTONIC
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| 70 | clock_gettime(CLOCK_MONOTONIC, pCur);
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| 71 | #else
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| 72 | gettimeofday(pCur, NULL);
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| 73 | #endif
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| 74 |
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| 75 | if ( pCur->tv_sec == pPrev->tv_sec
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| 76 | #ifdef USE_CLOCK_MONOTONIC
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| 77 | && pCur->tv_nsec < pPrev->tv_nsec
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| 78 | #else
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| 79 | && pCur->tv_usec < pPrev->tv_usec
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| 80 | #endif
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| 81 | )
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| 82 | {
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| 83 | #ifdef USE_CLOCK_MONOTONIC
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| 84 | printf("tv_nsec in the past: %ld.%09u < %ld.%09u - %u nsec\n",
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| 85 | (long)pCur->tv_sec, (unsigned)pCur->tv_nsec,
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| 86 | (long)pPrev->tv_sec, (unsigned)pPrev->tv_nsec,
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| 87 | (unsigned)pPrev->tv_nsec - (unsigned)pCur->tv_nsec);
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| 88 | #else
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| 89 | printf("tv_usec in the past: %ld.%06u < %ld.%06u - %u usec\n",
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| 90 | (long)pCur->tv_sec, (unsigned)pCur->tv_usec,
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| 91 | (long)pPrev->tv_sec, (unsigned)pPrev->tv_usec,
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| 92 | (unsigned)pPrev->tv_usec - (unsigned)pCur->tv_usec);
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| 93 | #endif
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| 94 | cErrors++;
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| 95 | if (cErrors > 1000)
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| 96 | break;
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| 97 | }
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| 98 | else if (pCur->tv_sec < pPrev->tv_sec)
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| 99 | {
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| 100 | #ifdef USE_CLOCK_MONOTONIC
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| 101 | printf("tv_sec in the past: %ld.%09u < %ld.%09u\n",
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| 102 | (long)pCur->tv_sec, (unsigned)pCur->tv_nsec,
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| 103 | (long)pPrev->tv_sec, (unsigned)pPrev->tv_nsec);
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| 104 | #else
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| 105 | printf("tv_sec in the past: %ld.%06u < %ld.%06u\n",
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| 106 | (long)pCur->tv_sec, (unsigned)pCur->tv_usec,
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| 107 | (long)pPrev->tv_sec, (unsigned)pPrev->tv_usec);
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| 108 | #endif
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| 109 | cErrors++;
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| 110 | if (cErrors > 1000)
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| 111 | break;
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| 112 | }
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| 113 | else
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| 114 | {
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| 115 | /* swap */
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| 116 | pTmp = pPrev;
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| 117 | pPrev = pCur;
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| 118 | pCur = pTmp;
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| 119 | }
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| 120 | }
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| 121 |
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| 122 | return 1;
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| 123 | }
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