/* Copyright (C) 1991, 94, 95, 96, 97, 98, 2001 Free Software Foundation, Inc. This file is part of the GNU C Library. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ #include <errno.h> #define __USE_GNU #include <signal.h> /* Block signals in MASK, returning the old mask. */ int sigblock (int mask) { register unsigned int sig; sigset_t set, oset; if (__sigemptyset (&set) < 0) return -1; if (sizeof (mask) == sizeof (set)) *(int *) &set = mask; else if (sizeof (unsigned long int) == sizeof (set)) *(unsigned long int *) &set = (unsigned int) mask; else for (sig = 1; sig < NSIG && sig <= sizeof (mask) * 8; ++sig) if ((mask & sigmask (sig)) && __sigaddset (&set, sig) < 0) return -1; if (sigprocmask (SIG_BLOCK, &set, &oset) < 0) return -1; if (sizeof (mask) == sizeof (oset)) mask = *(int *) &oset; else if (sizeof (unsigned long int) == sizeof (oset)) mask = *(unsigned long int*) &oset; else for (sig = 1, mask = 0; sig < NSIG && sig <= sizeof (mask) * 8; ++sig) if (__sigismember (&oset, sig)) mask |= sigmask (sig); return mask; }