1/* Test program for POSIX clock_* functions.
2 Copyright (C) 2000-2024 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
4
5 The GNU C Library is free software; you can redistribute it and/or
6 modify it under the terms of the GNU Lesser General Public
7 License as published by the Free Software Foundation; either
8 version 2.1 of the License, or (at your option) any later version.
9
10 The GNU C Library is distributed in the hope that it will be useful,
11 but WITHOUT ANY WARRANTY; without even the implied warranty of
12 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13 Lesser General Public License for more details.
14
15 You should have received a copy of the GNU Lesser General Public
16 License along with the GNU C Library; if not, see
17 <https://www.gnu.org/licenses/>. */
18
19#include <stdio.h>
20#include <string.h>
21#include <time.h>
22#include <stdint.h>
23
24
25/* We want to see output immediately. */
26#define STDOUT_UNBUFFERED
27
28static int
29clock_test (clockid_t cl)
30{
31 struct timespec old_ts;
32 struct timespec ts;
33 struct timespec waitit;
34 int result = 0;
35 int i;
36
37 memset (&ts, '\0', sizeof ts);
38
39 waitit.tv_sec = 0;
40 waitit.tv_nsec = 500000000;
41
42 /* Get and print resolution of the clock. */
43 if (clock_getres (clock_id: cl, res: &ts) == 0)
44 {
45 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000)
46 {
47 printf (format: "clock %d: nanosecond value of resolution wrong\n", cl);
48 result = 1;
49 }
50 else
51 printf (format: "clock %d: resolution = %jd.%09jd secs\n",
52 cl, (intmax_t) ts.tv_sec, (intmax_t) ts.tv_nsec);
53 }
54 else
55 {
56 printf (format: "clock %d: cannot get resolution\n", cl);
57 result = 1;
58 }
59
60 memset (&ts, '\0', sizeof ts);
61 memset (&old_ts, '\0', sizeof old_ts);
62
63 /* Next get the current time value a few times. */
64 for (i = 0; i < 10; ++i)
65 {
66 if (clock_gettime (clock_id: cl, tp: &ts) == 0)
67 {
68 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000)
69 {
70 printf (format: "clock %d: nanosecond value of time wrong (try %d)\n",
71 cl, i);
72 result = 1;
73 }
74 else
75 {
76 printf (format: "clock %d: time = %jd.%09jd secs\n",
77 cl, (intmax_t) ts.tv_sec, (intmax_t) ts.tv_nsec);
78
79 if (memcmp (&ts, &old_ts, sizeof ts) == 0)
80 {
81 printf (format: "clock %d: time hasn't changed (try %d)\n", cl, i);
82 result = 1;
83
84 old_ts = ts;
85 }
86 }
87 }
88 else
89 {
90 printf (format: "clock %d: cannot get time (try %d)\n", cl, i);
91 result = 1;
92 }
93
94 /* Wait a bit before the next iteration. */
95 nanosleep (requested_time: &waitit, NULL);
96 }
97
98 return result;
99}
100
101static int
102do_test (void)
103{
104 clockid_t cl;
105 int result;
106
107 result = clock_test (CLOCK_REALTIME);
108
109 if (clock_getcpuclockid (pid: 0, clock_id: &cl) == 0)
110 /* XXX It's not yet a bug when this fails. */
111 clock_test (cl);
112 else
113 printf(format: "CPU clock unavailable, skipping test\n");
114
115 return result;
116}
117#define TEST_FUNCTION do_test ()
118
119
120#include "../test-skeleton.c"
121

source code of glibc/time/tst-clock.c