1 /* Test for clock_adjtime
2 Copyright (C) 2021-2022 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 <time.h>
20 #include <stdlib.h>
21 #include <sys/time.h>
22 #include <support/check.h>
23 #include <support/timespec.h>
24
25 #ifndef ADJTIME_CALL
26 # define ADJTIME_CALL(__clock, __timex) clock_adjtime (__clock, __timex)
27 #endif
28
29 static int
do_test(void)30 do_test (void)
31 {
32 struct timespec tv_then, tv_now;
33 struct timex delta;
34
35 /* Check if altering target time is allowed. */
36 if (getenv (SETTIME_ENV_NAME) == NULL)
37 FAIL_UNSUPPORTED ("clock_adjtime is executed only when "\
38 SETTIME_ENV_NAME" is set\n");
39
40 tv_then = xclock_now (CLOCK_REALTIME);
41
42 /* Setup time value to adjust - 1 sec. */
43 delta.time.tv_sec = 1;
44 delta.time.tv_usec = 0;
45 delta.modes = ADJ_SETOFFSET;
46
47 int ret = ADJTIME_CALL (CLOCK_REALTIME, &delta);
48 if (ret == -1)
49 FAIL_EXIT1 ("clock_adjtime failed: %m\n");
50
51 tv_now = xclock_now (CLOCK_REALTIME);
52
53 /* Check if clock_adjtime adjusted the system time. */
54 struct timespec r = timespec_sub (tv_now, tv_then);
55 TEST_COMPARE (support_timespec_check_in_range
56 ((struct timespec) { 1, 0 }, r, 0.9, 1.1), 1);
57
58 return 0;
59 }
60
61 #include <support/test-driver.c>
62