sysdeps/mach/sleep.c

   1 /* Copyright (C) 1992, 1993, 1994 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 Library General Public License as
   6 published by the Free Software Foundation; either version 2 of the
   7 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 Library General Public License for more details.
  13
  14 You should have received a copy of the GNU Library General Public
  15 License along with the GNU C Library; see the file COPYING.LIB.  If
  16 not, write to the Free Software Foundation, Inc., 675 Mass Ave,
  17 Cambridge, MA 02139, USA.  */
  18
  19 #include <ansidecl.h>
  20 #include <signal.h>
  21 #include <time.h>
  22 #include <unistd.h>
  23 #include <mach.h>
  24
  25 /* Make the process sleep for SECONDS seconds, or until a signal arrives
  26    and is not ignored.  The function returns the number of seconds less
  27    than SECONDS which it actually slept (zero if it slept the full time).
  28    There is no return value to indicate error, but if `sleep' returns
  29    SECONDS, it probably didn't work.  */
  30 unsigned int
  31 DEFUN(sleep, (seconds), unsigned int seconds)
  32 {
  33   time_t before, after;
  34   mach_port_t recv;
  35
  36   recv = __mach_reply_port ();
  37
  38   before = time ((time_t *) NULL);
  39   (void) __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
  40                      0, 0, recv, seconds * 1000, MACH_PORT_NULL);
  41   after = time ((time_t *) NULL);
  42   __mach_port_destroy (__mach_task_self (), recv);
  43
  44   return seconds - (after - before);
  45 }