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glibc  2.9
sigsuspend.c
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00001 /* Copyright (C) 1991, 1996, 1997, 1998, 2002 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 <errno.h>
00020 #include <signal.h>
00021 #include <stddef.h>
00022 #include <unistd.h>
00023 
00024 
00025 /* Change the set of blocked signals to SET,
00026    wait until a signal arrives, and restore the set of blocked signals.  */
00027 int
00028 __sigsuspend (set)
00029      const sigset_t *set;
00030 {
00031   sigset_t oset;
00032   int save;
00033 
00034   if (set == NULL)
00035     {
00036       __set_errno (EINVAL);
00037       return -1;
00038     }
00039 
00040   if (sigprocmask (SIG_SETMASK, set, &oset) < 0)
00041     return -1;
00042 
00043   (void) pause();
00044   save = errno;
00045 
00046   if (sigprocmask (SIG_SETMASK, &oset, (sigset_t *) NULL) < 0)
00047     return -1;
00048 
00049   __set_errno (save);
00050   return -1;
00051 }
00052 libc_hidden_def (__sigsuspend)
00053 weak_alias (__sigsuspend, sigsuspend)