1 /*
2 * SPDX-License-Identifier: BSD-3-Clause
3 *
4 * Copyright © 2020 Keith Packard
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 * notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above
14 * copyright notice, this list of conditions and the following
15 * disclaimer in the documentation and/or other materials provided
16 * with the distribution.
17 *
18 * 3. Neither the name of the copyright holder nor the names of its
19 * contributors may be used to endorse or promote products derived
20 * from this software without specific prior written permission.
21 *
22 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
23 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
24 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
25 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
26 * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
27 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
28 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
29 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
30 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
31 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
32 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
33 * OF THE POSSIBILITY OF SUCH DAMAGE.
34 */
35
36 #include <stdlib.h>
37 #include <sys/time.h>
38 #include <stdio.h>
39
40 int
main(void)41 main(void)
42 {
43 int loop;
44 struct timeval prev, cur;
45 int ret;
46
47 ret = gettimeofday(&prev, NULL);
48 if (ret < 0) {
49 printf("gettimeofday return %d\n", ret);
50 exit(2);
51 }
52 if (prev.tv_sec < 1600000000LL) {
53 printf("gettimeofday return value before 2020-9-13 %lld\n",
54 (long long) prev.tv_sec);
55 exit(2);
56 }
57 for (loop = 0; loop < 10000; loop++) {
58 ret = gettimeofday(&cur, NULL);
59 if (ret < 0) {
60 printf("gettimeofday return %d\n", ret);
61 exit(2);
62 }
63 if (cur.tv_sec > prev.tv_sec + 1000) {
64 printf("gettimeofday: seconds changed by %lld\n",
65 (long long) (cur.tv_sec - prev.tv_sec));
66 exit(2);
67 }
68 if (cur.tv_sec > prev.tv_sec ||
69 (cur.tv_sec == prev.tv_sec &&
70 cur.tv_usec > prev.tv_usec))
71 {
72 printf("gettimeofday: ok\n");
73 exit(0);
74 }
75 if (cur.tv_sec < prev.tv_sec ||
76 (cur.tv_sec == prev.tv_sec &&
77 cur.tv_usec < prev.tv_usec))
78 {
79 printf("gettimeofday: clock went backwards\n");
80 exit(2);
81 }
82 }
83 printf("gettimeofday: clock never changed\n");
84 exit(1);
85 }
86
