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/* nanosleep -- sleep for a period specified with a struct timespec
Copyright (C) 2002-2019 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
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <mach.h>
#include <time.h>
#include <unistd.h>
# define timespec_sub(a, b, result) \
do { \
(result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
(result)->tv_nsec = (a)->tv_nsec - (b)->tv_nsec; \
if ((result)->tv_nsec < 0) { \
--(result)->tv_sec; \
(result)->tv_nsec += 1000000000; \
} \
} while (0)
int
__libc_nanosleep (const struct timespec *requested_time,
struct timespec *remaining)
{
mach_port_t recv;
struct timespec before;
error_t err;
if (requested_time->tv_sec < 0
|| ! valid_nanoseconds (requested_time->tv_nsec))
{
errno = EINVAL;
return -1;
}
const mach_msg_timeout_t ms
= requested_time->tv_sec * 1000
+ (requested_time->tv_nsec + 999999) / 1000000;
recv = __mach_reply_port ();
if (remaining != 0)
__clock_gettime (CLOCK_REALTIME, &before);
err = __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
0, 0, recv, ms, MACH_PORT_NULL);
__mach_port_destroy (mach_task_self (), recv);
if (err == EMACH_RCV_INTERRUPTED)
{
if (remaining != 0)
{
struct timespec after, elapsed;
__clock_gettime (CLOCK_REALTIME, &after);
timespec_sub (&after, &before, &elapsed);
timespec_sub (requested_time, &elapsed, remaining);
}
errno = EINTR;
return -1;
}
return 0;
}
weak_alias(__libc_nanosleep, __nanosleep)
libc_hidden_def (__nanosleep)
weak_alias (__libc_nanosleep, nanosleep)
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