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/* 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;

}