mirror of git://sourceware.org/git/glibc.git
80 lines
2.4 KiB
C
80 lines
2.4 KiB
C
/* nanosleep -- sleep for a period specified with a struct timespec
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Copyright (C) 2002-2019 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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<https://www.gnu.org/licenses/>. */
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#include <errno.h>
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#include <mach.h>
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#include <time.h>
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#include <unistd.h>
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# define timespec_sub(a, b, result) \
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do { \
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(result)->tv_sec = (a)->tv_sec - (b)->tv_sec; \
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(result)->tv_nsec = (a)->tv_nsec - (b)->tv_nsec; \
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if ((result)->tv_nsec < 0) { \
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--(result)->tv_sec; \
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(result)->tv_nsec += 1000000000; \
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} \
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} while (0)
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int
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__libc_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 timespec before;
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error_t err;
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if (requested_time->tv_sec < 0
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|| ! valid_nanoseconds (requested_time->tv_nsec))
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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 != 0)
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__clock_gettime (CLOCK_REALTIME, &before);
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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 != 0)
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{
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struct timespec after, elapsed;
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__clock_gettime (CLOCK_REALTIME, &after);
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timespec_sub (&after, &before, &elapsed);
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timespec_sub (requested_time, &elapsed, 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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weak_alias(__libc_nanosleep, __nanosleep)
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libc_hidden_def (__nanosleep)
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weak_alias (__libc_nanosleep, nanosleep)
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