sysdeps/mach/sleep.c

   1 /* Copyright (C) 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
   2    This file is part of the GNU C Library.
   3
   4    The GNU C Library is free software; you can redistribute it and/or
   5    modify it under the terms of the GNU Lesser General Public
   6    License as published by the Free Software Foundation; either
   7    version 2.1 of the License, or (at your option) any later version.
   8
   9    The GNU C Library is distributed in the hope that it will be useful,
  10    but WITHOUT ANY WARRANTY; without even the implied warranty of
  11    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  12    Lesser General Public License for more details.
  13
  14    You should have received a copy of the GNU Lesser General Public
  15    License along with the GNU C Library; if not, write to the Free
  16    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
  17    02111-1307 USA.  */
  18
  19 #include <signal.h>
  20 #include <time.h>
  21 #include <unistd.h>
  22 #include <mach.h>
  23
  24 /* Make the process sleep for SECONDS seconds, or until a signal arrives
  25    and is not ignored.  The function returns the number of seconds less
  26    than SECONDS which it actually slept (zero if it slept the full time).
  27    There is no return value to indicate error, but if `sleep' returns
  28    SECONDS, it probably didn't work.  */
  29 unsigned int
  30 __sleep (unsigned int seconds)
  31 {
  32   time_t before, after;
  33   mach_port_t recv;
  34
  35   recv = __mach_reply_port ();
  36
  37   before = time ((time_t *) NULL);
  38   (void) __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
  39                      0, 0, recv, seconds * 1000, MACH_PORT_NULL);
  40   after = time ((time_t *) NULL);
  41   __mach_port_destroy (__mach_task_self (), recv);
  42
  43   return seconds - (after - before);
  44 }
  45 weak_alias (__sleep, sleep)