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glibc  2.9
sleep.c
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00001 /* Copyright (C) 1992, 1993, 1994, 1997 Free Software Foundation, Inc.
00002    This file is part of the GNU C Library.
00003 
00004    The GNU C Library is free software; you can redistribute it and/or
00005    modify it under the terms of the GNU Lesser General Public
00006    License as published by the Free Software Foundation; either
00007    version 2.1 of the License, or (at your option) any later version.
00008 
00009    The GNU C Library is distributed in the hope that it will be useful,
00010    but WITHOUT ANY WARRANTY; without even the implied warranty of
00011    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00012    Lesser General Public License for more details.
00013 
00014    You should have received a copy of the GNU Lesser General Public
00015    License along with the GNU C Library; if not, write to the Free
00016    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00017    02111-1307 USA.  */
00018 
00019 #include <signal.h>
00020 #include <time.h>
00021 #include <unistd.h>
00022 #include <mach.h>
00023 
00024 /* Make the process sleep for SECONDS seconds, or until a signal arrives
00025    and is not ignored.  The function returns the number of seconds less
00026    than SECONDS which it actually slept (zero if it slept the full time).
00027    There is no return value to indicate error, but if `sleep' returns
00028    SECONDS, it probably didn't work.  */
00029 unsigned int
00030 __sleep (unsigned int seconds)
00031 {
00032   time_t before, after;
00033   mach_port_t recv;
00034 
00035   recv = __mach_reply_port ();
00036 
00037   before = time ((time_t *) NULL);
00038   (void) __mach_msg (NULL, MACH_RCV_MSG|MACH_RCV_TIMEOUT|MACH_RCV_INTERRUPT,
00039                    0, 0, recv, seconds * 1000, MACH_PORT_NULL);
00040   after = time ((time_t *) NULL);
00041   __mach_port_destroy (__mach_task_self (), recv);
00042 
00043   return seconds - (after - before);
00044 }
00045 weak_alias (__sleep, sleep)