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glibc  2.9
pause.c
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00001 /* pause -- suspend the process until a signal arrives.  POSIX.1 version.
00002    Copyright (C) 2003, 2006 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 <signal.h>
00021 #include <unistd.h>
00022 #include <sysdep-cancel.h>
00023 
00024 /* Suspend the process until a signal arrives.
00025    This always returns -1 and sets errno to EINTR.  */
00026 
00027 int
00028 __libc_pause (void)
00029 {
00030   sigset_t set;
00031 
00032   __sigemptyset (&set);
00033   __sigprocmask (SIG_BLOCK, NULL, &set);
00034 
00035   /* pause is a cancellation point, but so is sigsuspend.
00036      So no need for anything special here.  */
00037 
00038   return __sigsuspend (&set);
00039 }
00040 weak_alias (__libc_pause, pause)
00041 
00042 LIBC_CANCEL_HANDLED ();            /* sigsuspend handles our cancellation.  */
00043 
00044 #ifndef NO_CANCELLATION
00045 # include <not-cancel.h>
00046 
00047 int
00048 __pause_nocancel (void)
00049 {
00050   sigset_t set;
00051 
00052   __sigemptyset (&set);
00053   __sigprocmask (SIG_BLOCK, NULL, &set);
00054 
00055   return sigsuspend_not_cancel (&set);
00056 }
00057 #endif