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/* Copyright (C) 2013 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
<http://www.gnu.org/licenses/>. */
#include <errno.h>
#include <stdint.h>
#include <time.h>
#include <sys/time.h>
#include <libc-internal.h>
#include <ldsodefs.h>
#include <sysdep.h>
int __syscall_clock_getres(clockid_t clock_id, struct timespec *tp);
libc_hidden_proto (__syscall_clock_getres)
int __syscall_clock_gettime(clockid_t clock_id, struct timespec *tp);
libc_hidden_proto (__syscall_clock_gettime)
/* Get resolution of clock. */
int
__clock_getres (clockid_t clock_id, struct timespec *tp)
{
/* we could try to provide fallback
via ??? for CLOCK_REALTIME
via HP_TIMING for CLOCK_PROCESS_CPUTIME_ID,
CLOCK_THREAD_CPUTIME_ID and related timers
for now just pass it to kernel
*/
/* the negative clock_id means a CPU-timer, the resolution is same for all of them
the kernel returns resolution regardless whether the timer is accessible,
but POSIX/testsuite expects EINVAL
*/
if (clock_id < 0)
{
int rv;
/* we reuse user provided struct timespec */
rv = INLINE_SYSCALL (clock_gettime, 2, clock_id, tp);
if (rv != 0)
return rv;
/* valid, now really get the resolution */
}
return INLINE_SYSCALL (clock_getres, 2, clock_id, tp);
}
strong_alias (__clock_getres, clock_getres)
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