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69 lines
2.0 KiB
C
69 lines
2.0 KiB
C
/* nanosleep -- sleep for a period specified with a struct timespec
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Copyright (C) 2002-2012 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library 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 GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<http://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <mach.h>
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#include <sys/time.h>
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#include <unistd.h>
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int
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__nanosleep (const struct timespec *requested_time,
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struct timespec *remaining)
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{
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mach_port_t recv;
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struct timeval before, after;
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if (requested_time->tv_sec < 0
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|| requested_time->tv_nsec < 0
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|| requested_time->tv_nsec >= 1000000000)
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{
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errno = EINVAL;
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return -1;
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}
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const mach_msg_timeout_t ms
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= requested_time->tv_sec * 1000
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+ (requested_time->tv_nsec + 999999) / 1000000;
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recv = __mach_reply_port ();
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if (remaining && __gettimeofday (&before, NULL) < 0)
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return -1;
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error_t err = __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
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0, 0, recv, ms, MACH_PORT_NULL);
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__mach_port_destroy (mach_task_self (), recv);
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if (err == EMACH_RCV_INTERRUPTED)
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{
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if (remaining && __gettimeofday (&after, NULL) >= 0)
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{
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struct timeval req_time, elapsed, rem;
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TIMESPEC_TO_TIMEVAL (&req_time, requested_time);
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timersub (&after, &before, &elapsed);
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timersub (&req_time, &elapsed, &rem);
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TIMEVAL_TO_TIMESPEC (&rem, remaining);
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}
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errno = EINTR;
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return -1;
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}
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return 0;
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}
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libc_hidden_def (__nanosleep)
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weak_alias (__nanosleep, nanosleep)
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