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/* Get resolution of a time base.
Copyright 2021-2023 Free Software Foundation, Inc.
This file 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 3 of the
License, or (at your option) any later version.
This file 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 this program. If not, see <https://www.gnu.org/licenses/>. */
#include <config.h>
#include <time.h>
#include "timespec.h"
/* Set TS to resolution of time base BASE.
Return BASE if successful, 0 otherwise. */
int
timespec_getres (struct timespec *ts, int base)
{
if (base == TIME_UTC)
{
#if defined CLOCK_REALTIME && HAVE_CLOCK_GETRES
clock_getres (CLOCK_REALTIME, ts);
#else
long int res = gettime_res ();
*ts = (struct timespec) { .tv_sec = res / TIMESPEC_HZ,
.tv_nsec = res % TIMESPEC_HZ };
#endif
return base;
}
return 0;
}
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