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/* Test for clock_adjtime
Copyright (C) 2021-2023 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <time.h>
#include <stdlib.h>
#include <sys/time.h>
#include <support/check.h>
#include <support/timespec.h>
#ifndef ADJTIME_CALL
# define ADJTIME_CALL(__clock, __timex) clock_adjtime (__clock, __timex)
#endif
static int
do_test (void)
{
struct timespec tv_then, tv_now;
struct timex delta;
/* Check if altering target time is allowed. */
if (getenv (SETTIME_ENV_NAME) == NULL)
FAIL_UNSUPPORTED ("clock_adjtime is executed only when "\
SETTIME_ENV_NAME" is set\n");
tv_then = xclock_now (CLOCK_REALTIME);
/* Setup time value to adjust - 1 sec. */
delta.time.tv_sec = 1;
delta.time.tv_usec = 0;
delta.modes = ADJ_SETOFFSET;
int ret = ADJTIME_CALL (CLOCK_REALTIME, &delta);
if (ret == -1)
FAIL_EXIT1 ("clock_adjtime failed: %m\n");
tv_now = xclock_now (CLOCK_REALTIME);
/* Check if clock_adjtime adjusted the system time. */
struct timespec r = timespec_sub (tv_now, tv_then);
TEST_COMPARE (support_timespec_check_in_range
((struct timespec) { 1, 0 }, r, 0.9, 1.1), 1);
return 0;
}
#include <support/test-driver.c>
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