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glibc  2.9
sighold.c
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00001 /* Add SIG to the calling process' signal mask.
00002    Copyright (C) 1998, 2000, 2003 Free Software Foundation, Inc.
00003    This file is part of the GNU C Library.
00004    Contributed by Ulrich Drepper <drepper@cygnus.com>, 1998.
00005 
00006    The GNU C Library is free software; you can redistribute it and/or
00007    modify it under the terms of the GNU Lesser General Public
00008    License as published by the Free Software Foundation; either
00009    version 2.1 of the License, or (at your option) any later version.
00010 
00011    The GNU C Library is distributed in the hope that it will be useful,
00012    but WITHOUT ANY WARRANTY; without even the implied warranty of
00013    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
00014    Lesser General Public License for more details.
00015 
00016    You should have received a copy of the GNU Lesser General Public
00017    License along with the GNU C Library; if not, write to the Free
00018    Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
00019    02111-1307 USA.  */
00020 
00021 #define __need_NULL
00022 #include <stddef.h>
00023 #include <signal.h>
00024 
00025 int
00026 sighold (sig)
00027      int sig;
00028 {
00029   sigset_t set;
00030 
00031   /* Retrieve current signal set.  */
00032   if (__sigprocmask (SIG_SETMASK, NULL, &set) < 0)
00033     return -1;
00034 
00035   /* Add the specified signal.  */
00036   if (sigaddset (&set, sig) < 0)
00037     return -1;
00038 
00039   /* Set the new mask.  */
00040   return __sigprocmask (SIG_SETMASK, &set, NULL);
00041 }