| 1 | /* Test for clock_adjtime |
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| 2 | Copyright (C) 2021-2024 Free Software Foundation, Inc. |
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| 3 | This file is part of the GNU C Library. |
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| 4 | |
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| 5 | The GNU C Library is free software; you can redistribute it and/or |
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| 6 | modify it under the terms of the GNU Lesser General Public |
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| 7 | License as published by the Free Software Foundation; either |
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| 8 | version 2.1 of the License, or (at your option) any later version. |
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| 9 | |
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| 10 | The GNU C Library is distributed in the hope that it will be useful, |
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| 11 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
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| 12 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
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| 13 | Lesser General Public License for more details. |
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| 14 | |
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| 15 | You should have received a copy of the GNU Lesser General Public |
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| 16 | License along with the GNU C Library; if not, see |
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| 17 | <https://www.gnu.org/licenses/>. */ |
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| 18 | |
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| 19 | #include <time.h> |
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| 20 | #include <stdlib.h> |
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| 21 | #include <sys/time.h> |
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| 22 | #include <support/check.h> |
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| 23 | #include <support/timespec.h> |
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| 24 | |
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| 25 | #ifndef ADJTIME_CALL |
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| 26 | # define ADJTIME_CALL(__clock, __timex) clock_adjtime (__clock, __timex) |
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| 27 | #endif |
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| 28 | |
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| 29 | static int |
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| 30 | do_test (void) |
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| 31 | { |
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| 32 | struct timespec tv_then, tv_now; |
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| 33 | struct timex delta; |
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| 34 | |
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| 35 | /* Check if altering target time is allowed. */ |
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| 36 | if (getenv (SETTIME_ENV_NAME) == NULL) |
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| 37 | FAIL_UNSUPPORTED ("clock_adjtime is executed only when " \ |
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| 38 | SETTIME_ENV_NAME" is set\n" ); |
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| 39 | |
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| 40 | tv_then = xclock_now (CLOCK_REALTIME); |
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| 41 | |
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| 42 | /* Setup time value to adjust - 1 sec. */ |
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| 43 | delta.time.tv_sec = 1; |
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| 44 | delta.time.tv_usec = 0; |
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| 45 | delta.modes = ADJ_SETOFFSET; |
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| 46 | |
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| 47 | int ret = ADJTIME_CALL (CLOCK_REALTIME, &delta); |
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| 48 | if (ret == -1) |
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| 49 | FAIL_EXIT1 ("clock_adjtime failed: %m\n" ); |
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| 50 | |
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| 51 | tv_now = xclock_now (CLOCK_REALTIME); |
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| 52 | |
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| 53 | /* Check if clock_adjtime adjusted the system time. */ |
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| 54 | struct timespec r = timespec_sub (tv_now, tv_then); |
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| 55 | TEST_COMPARE (support_timespec_check_in_range |
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| 56 | ((struct timespec) { 1, 0 }, r, 0.9, 1.1), 1); |
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| 57 | |
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| 58 | return 0; |
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| 59 | } |
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| 60 | |
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| 61 | #include <support/test-driver.c> |
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| 62 | |
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