41 lines
1.3 KiB
C
41 lines
1.3 KiB
C
/* Get resolution of a time base.
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Copyright 2021-2024 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation, either version 3 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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#include <config.h>
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#include <time.h>
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#include "timespec.h"
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/* Set TS to resolution of time base BASE.
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Return BASE if successful, 0 otherwise. */
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int
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timespec_getres (struct timespec *ts, int base)
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{
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if (base == TIME_UTC)
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{
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#if defined CLOCK_REALTIME && HAVE_CLOCK_GETRES
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clock_getres (CLOCK_REALTIME, ts);
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#else
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long int res = gettime_res ();
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*ts = (struct timespec) { .tv_sec = res / TIMESPEC_HZ,
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.tv_nsec = res % TIMESPEC_HZ };
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#endif
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return base;
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}
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return 0;
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}
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