| /* nanosleep -- sleep for a period specified with a struct timespec |
| Copyright (C) 2002-2014 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 <mach.h> |
| #include <sys/time.h> |
| #include <unistd.h> |
| |
| int |
| __nanosleep (const struct timespec *requested_time, |
| struct timespec *remaining) |
| { |
| mach_port_t recv; |
| struct timeval before, after; |
| |
| if (requested_time->tv_sec < 0 |
| || requested_time->tv_nsec < 0 |
| || requested_time->tv_nsec >= 1000000000) |
| { |
| 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 && __gettimeofday (&before, NULL) < 0) |
| return -1; |
| error_t 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 && __gettimeofday (&after, NULL) >= 0) |
| { |
| struct timeval req_time, elapsed, rem; |
| TIMESPEC_TO_TIMEVAL (&req_time, requested_time); |
| timersub (&after, &before, &elapsed); |
| timersub (&req_time, &elapsed, &rem); |
| TIMEVAL_TO_TIMESPEC (&rem, remaining); |
| } |
| |
| errno = EINTR; |
| return -1; |
| } |
| |
| return 0; |
| } |
| libc_hidden_def (__nanosleep) |
| weak_alias (__nanosleep, nanosleep) |