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[glibc.git] / time / tst-clock.c
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1 /* Test program for POSIX clock_* functions.
2 Copyright (C) 2000-2023 Free Software Foundation, Inc.
3 This file is part of the GNU C Library.
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.
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.
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/>. */
19 #include <stdio.h>
20 #include <string.h>
21 #include <time.h>
22 #include <stdint.h>
25 /* We want to see output immediately. */
26 #define STDOUT_UNBUFFERED
28 static int
29 clock_test (clockid_t cl)
31 struct timespec old_ts;
32 struct timespec ts;
33 struct timespec waitit;
34 int result = 0;
35 int i;
37 memset (&ts, '\0', sizeof ts);
39 waitit.tv_sec = 0;
40 waitit.tv_nsec = 500000000;
42 /* Get and print resolution of the clock. */
43 if (clock_getres (cl, &ts) == 0)
45 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000)
47 printf ("clock %d: nanosecond value of resolution wrong\n", cl);
48 result = 1;
50 else
51 printf ("clock %d: resolution = %jd.%09jd secs\n",
52 cl, (intmax_t) ts.tv_sec, (intmax_t) ts.tv_nsec);
54 else
56 printf ("clock %d: cannot get resolution\n", cl);
57 result = 1;
60 memset (&ts, '\0', sizeof ts);
61 memset (&old_ts, '\0', sizeof old_ts);
63 /* Next get the current time value a few times. */
64 for (i = 0; i < 10; ++i)
66 if (clock_gettime (cl, &ts) == 0)
68 if (ts.tv_nsec < 0 || ts.tv_nsec >= 1000000000)
70 printf ("clock %d: nanosecond value of time wrong (try %d)\n",
71 cl, i);
72 result = 1;
74 else
76 printf ("clock %d: time = %jd.%09jd secs\n",
77 cl, (intmax_t) ts.tv_sec, (intmax_t) ts.tv_nsec);
79 if (memcmp (&ts, &old_ts, sizeof ts) == 0)
81 printf ("clock %d: time hasn't changed (try %d)\n", cl, i);
82 result = 1;
84 old_ts = ts;
88 else
90 printf ("clock %d: cannot get time (try %d)\n", cl, i);
91 result = 1;
94 /* Wait a bit before the next iteration. */
95 nanosleep (&waitit, NULL);
98 return result;
101 static int
102 do_test (void)
104 clockid_t cl;
105 int result;
107 result = clock_test (CLOCK_REALTIME);
109 if (clock_getcpuclockid (0, &cl) == 0)
110 /* XXX It's not yet a bug when this fails. */
111 clock_test (cl);
112 else
113 printf("CPU clock unavailble, skipping test\n");
115 return result;
117 #define TEST_FUNCTION do_test ()
120 #include "../test-skeleton.c"