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/* Basic tests for timespec_getres.
Copyright (C) 2021-2025 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 <support/check.h>
static int
do_test (void)
{
{
struct timespec ts;
TEST_COMPARE (timespec_getres (&ts, 0), 0);
TEST_COMPARE (timespec_getres (NULL, 0), 0);
}
{
struct timespec ts;
TEST_COMPARE (timespec_getres (&ts, TIME_UTC), TIME_UTC);
/* Expect all supported systems to support TIME_UTC with
resolution better than one second. */
TEST_VERIFY (ts.tv_sec == 0);
TEST_VERIFY (ts.tv_nsec > 0);
TEST_VERIFY (ts.tv_nsec < 1000000000);
TEST_COMPARE (timespec_getres (NULL, TIME_UTC), TIME_UTC);
/* Expect the resolution to be the same as that reported for
CLOCK_REALTIME with clock_getres. */
struct timespec cts;
TEST_COMPARE (clock_getres (CLOCK_REALTIME, &cts), 0);
TEST_COMPARE (ts.tv_sec, cts.tv_sec);
TEST_COMPARE (ts.tv_nsec, cts.tv_nsec);
}
return 0;
}
#include <support/test-driver.c>
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