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/* Test setting the monotonic clock.
Copyright (C) 2007-2023 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 <errno.h>
#include <support/check.h>
#include <time.h>
#include <unistd.h>
int
do_test (void)
{
#if defined CLOCK_MONOTONIC && defined _POSIX_MONOTONIC_CLOCK
if (sysconf (_SC_MONOTONIC_CLOCK) <= 0)
FAIL_UNSUPPORTED ("_SC_MONOTONIC_CLOCK not supported");
struct timespec ts;
TEST_COMPARE (clock_gettime (CLOCK_MONOTONIC, &ts), 0);
/* Setting the monotonic clock must fail. */
TEST_VERIFY (clock_settime (CLOCK_MONOTONIC, &ts) == -1);
TEST_VERIFY (errno == EINVAL || errno == EPERM);
return 0;
#else
return EXIT_UNSUPPORTED;
#endif
}
#include <support/test-driver.c>
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