VirtualBox

source: vbox/trunk/src/VBox/ValidationKit/snippets/time-1.c

Last change on this file was 106061, checked in by vboxsync, 3 months ago

Copyright year updates by scm.

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1/* $Id: time-1.c 106061 2024-09-16 14:03:52Z vboxsync $ */
2/** @file
3 * Query the time and check that it always goes forward, POSIX only.
4 */
5
6/*
7 * Copyright (C) 2011-2024 Oracle and/or its affiliates.
8 *
9 * This file is part of VirtualBox base platform packages, as
10 * available from https://www.virtualbox.org.
11 *
12 * This program is free software; you can redistribute it and/or
13 * modify it under the terms of the GNU General Public License
14 * as published by the Free Software Foundation, in version 3 of the
15 * License.
16 *
17 * This program is distributed in the hope that it will be useful, but
18 * WITHOUT ANY WARRANTY; without even the implied warranty of
19 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
20 * General Public License for more details.
21 *
22 * You should have received a copy of the GNU General Public License
23 * along with this program; if not, see <https://www.gnu.org/licenses>.
24 *
25 * The contents of this file may alternatively be used under the terms
26 * of the Common Development and Distribution License Version 1.0
27 * (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
28 * in the VirtualBox distribution, in which case the provisions of the
29 * CDDL are applicable instead of those of the GPL.
30 *
31 * You may elect to license modified versions of this file under the
32 * terms and conditions of either the GPL or the CDDL or both.
33 *
34 * SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
35 */
36
37
38/*********************************************************************************************************************************
39* Header Files *
40*********************************************************************************************************************************/
41#include <stdio.h>
42#include <time.h>
43#include <sys/time.h>
44
45
46
47int main()
48{
49 unsigned cErrors = 0;
50#ifdef USE_CLOCK_MONOTONIC
51 struct timespec aTs[2];
52 struct timespec *pCur = &aTs[0];
53 struct timespec *pPrev = &aTs[1];
54 struct timespec *pTmp;
55#else
56 struct timeval aTv[2];
57 struct timeval *pCur = &aTv[0];
58 struct timeval *pPrev = &aTv[1];
59 struct timeval *pTmp;
60#endif
61
62#ifdef USE_CLOCK_MONOTONIC
63 clock_gettime(CLOCK_MONOTONIC, pPrev);
64#else
65 gettimeofday(pPrev, NULL);
66#endif
67 for (;;)
68 {
69#ifdef USE_CLOCK_MONOTONIC
70 clock_gettime(CLOCK_MONOTONIC, pCur);
71#else
72 gettimeofday(pCur, NULL);
73#endif
74
75 if ( pCur->tv_sec == pPrev->tv_sec
76#ifdef USE_CLOCK_MONOTONIC
77 && pCur->tv_nsec < pPrev->tv_nsec
78#else
79 && pCur->tv_usec < pPrev->tv_usec
80#endif
81 )
82 {
83#ifdef USE_CLOCK_MONOTONIC
84 printf("tv_nsec in the past: %ld.%09u < %ld.%09u - %u nsec\n",
85 (long)pCur->tv_sec, (unsigned)pCur->tv_nsec,
86 (long)pPrev->tv_sec, (unsigned)pPrev->tv_nsec,
87 (unsigned)pPrev->tv_nsec - (unsigned)pCur->tv_nsec);
88#else
89 printf("tv_usec in the past: %ld.%06u < %ld.%06u - %u usec\n",
90 (long)pCur->tv_sec, (unsigned)pCur->tv_usec,
91 (long)pPrev->tv_sec, (unsigned)pPrev->tv_usec,
92 (unsigned)pPrev->tv_usec - (unsigned)pCur->tv_usec);
93#endif
94 cErrors++;
95 if (cErrors > 1000)
96 break;
97 }
98 else if (pCur->tv_sec < pPrev->tv_sec)
99 {
100#ifdef USE_CLOCK_MONOTONIC
101 printf("tv_sec in the past: %ld.%09u < %ld.%09u\n",
102 (long)pCur->tv_sec, (unsigned)pCur->tv_nsec,
103 (long)pPrev->tv_sec, (unsigned)pPrev->tv_nsec);
104#else
105 printf("tv_sec in the past: %ld.%06u < %ld.%06u\n",
106 (long)pCur->tv_sec, (unsigned)pCur->tv_usec,
107 (long)pPrev->tv_sec, (unsigned)pPrev->tv_usec);
108#endif
109 cErrors++;
110 if (cErrors > 1000)
111 break;
112 }
113 else
114 {
115 /* swap */
116 pTmp = pPrev;
117 pPrev = pCur;
118 pCur = pTmp;
119 }
120 }
121
122 return 1;
123}
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