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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;

}