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55 lines
1.8 KiB
C
55 lines
1.8 KiB
C
/*****************************************************************************
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* clock_getres.c: POSIX clock_getres() replacement
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*****************************************************************************
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* Copyright © 2020 VLC authors and VideoLAN
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*
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* Author: Marvin Scholz <epirat07 at gmail dot com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program 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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*
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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, write to the Free Software Foundation,
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* Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
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*****************************************************************************/
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#ifdef __APPLE__
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#ifdef HAVE_CONFIG_H
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# include <config.h>
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#endif
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#include <sys/errno.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <mach/clock_types.h>
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int clock_getres(clockid_t clock_id, struct timespec *tp)
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{
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switch (clock_id) {
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case CLOCK_MONOTONIC:
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case CLOCK_REALTIME:
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// For realtime, it is using gettimeofday and for
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// the monotonic time it is relative to the system
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// boot time. Both of these use timeval, which has
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// at best microsecond precision.
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tp->tv_sec = 0;
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tp->tv_nsec = NSEC_PER_USEC;
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break;
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default:
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errno = EINVAL;
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return -1;
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}
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return 0;
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}
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#endif
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