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/* High-resolution sleep with the specified clock.
Copyright (C) 2000-2019 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 <assert.h>
#include <errno.h>
#include <time.h>
#include <sysdep-cancel.h>
/* This implementation assumes that these is only a `nanosleep' system
call. So we have to remap all other activities. */
int
__clock_nanosleep (clockid_t clock_id, int flags, const struct timespec *req,
struct timespec *rem)
{
struct timespec now;
if (__builtin_expect (req->tv_nsec, 0) < 0
|| __builtin_expect (req->tv_nsec, 0) >= 1000000000)
return EINVAL;
if (clock_id == CLOCK_THREAD_CPUTIME_ID)
return EINVAL; /* POSIX specifies EINVAL for this case. */
if (clock_id < CLOCK_REALTIME || clock_id > CLOCK_THREAD_CPUTIME_ID)
return EINVAL;
/* If we got an absolute time, remap it. */
if (flags == TIMER_ABSTIME)
{
long int nsec;
long int sec;
/* Make sure we use safe data types. */
assert (sizeof (sec) >= sizeof (now.tv_sec));
/* Get the current time for this clock. */
if (__clock_gettime (clock_id, &now) != 0)
return errno;
/* Compute the difference. */
nsec = req->tv_nsec - now.tv_nsec;
sec = req->tv_sec - now.tv_sec - (nsec < 0);
if (sec < 0)
/* The time has already elapsed. */
return 0;
now.tv_sec = sec;
now.tv_nsec = nsec + (nsec < 0 ? 1000000000 : 0);
/* From now on this is our time. */
req = &now;
/* Make sure we are not modifying the struct pointed to by REM. */
rem = NULL;
}
else if (flags != 0)
return EINVAL;
else if (clock_id != CLOCK_REALTIME)
/* Not supported. */
return ENOTSUP;
return __nanosleep (req, rem), 0 ? errno : 0;
}
weak_alias (__clock_nanosleep, clock_nanosleep)
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