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/* 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 <ansidecl.h>
#include <errno.h>
#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;
 
  if (sizeof (mask) == sizeof (set))
    set = mask;
  else
    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;
  if (sizeof (mask) == sizeof (oset))
    mask = oset;
  else
    for (sig = 1; sig < NSIG; ++sig)
      if (sigismember(&oset, sig))
	mask |= sigmask(sig);
 
  return mask;
}