/* Copyright (C) 1991 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 Library General Public License as published by the Free Software Foundation; either version 2 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 Library General Public License for more details. You should have received a copy of the GNU Library General Public License along with the GNU C Library; see the file COPYING.LIB. If not, write to the Free Software Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. */ #include <errno.h> #define __USE_BSD #include <signal.h> /* Block signals in MASK, returning the old mask. */ int sigblock (int mask) { register int sig; sigset_t set, oset; if (sigemptyset(&set) < 0) return -1; for (sig = 1; sig < NSIG; ++sig) if ((mask & sigmask(sig)) && sigaddset(&set, sig) < 0) return -1; if (sigprocmask(SIG_BLOCK, &set, &oset) < 0) return -1; mask = 0; for (sig = 1; sig < NSIG; ++sig) if (sigismember(&oset, sig)) mask |= sigmask(sig); return mask; }