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glibc  2.9
nanosleep.c
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00001 /* nanosleep -- sleep for a period specified with a struct timespec
00002    Copyright (C) 2002 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004 
00005    The GNU C Library is free software; you can redistribute it and/or
00006    modify it under the terms of the GNU Lesser General Public
00007    License as published by the Free Software Foundation; either
00008    version 2.1 of the License, or (at your option) any later version.
00009 
00010    The GNU C Library is distributed in the hope that it will be useful,
00011    but WITHOUT ANY WARRANTY; without even the implied warranty of
00012    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00013    Lesser General Public License for more details.
00014 
00015    You should have received a copy of the GNU Lesser General Public
00016    License along with the GNU C Library; if not, write to the Free
00017    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00018    02111-1307 USA.  */
00019 
00020 #include <errno.h>
00021 #include <mach.h>
00022 #include <sys/time.h>
00023 #include <unistd.h>
00024 
00025 int
00026 __nanosleep (const struct timespec *requested_time,
00027             struct timespec *remaining)
00028 {
00029   mach_port_t recv;
00030   struct timeval before, after;
00031   const mach_msg_timeout_t ms
00032     = requested_time->tv_sec * 1000
00033     + (requested_time->tv_nsec + 999999) / 1000000;
00034 
00035   recv = __mach_reply_port ();
00036 
00037   if (remaining && __gettimeofday (&before, NULL) < 0)
00038     return -1;
00039   (void) __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
00040                    0, 0, recv, ms, MACH_PORT_NULL);
00041   __mach_port_destroy (mach_task_self (), recv);
00042   if (remaining && __gettimeofday (&after, NULL) < 0)
00043     return -1;
00044 
00045   if (remaining)
00046     {
00047       timersub (&after, &before, &after);
00048       TIMEVAL_TO_TIMESPEC (&after, remaining);
00049     }
00050 
00051   return 0;
00052 }
00053 libc_hidden_def (__nanosleep)
00054 weak_alias (__nanosleep, nanosleep)