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/* Copyright (C) 1998, 2000 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., 59 Temple Place - Suite 330,

   Boston, MA 02111-1307, USA.  */

#include <errno.h>

#define __need_NULL

#include <stddef.h>

#include <signal.h>

/* Set the disposition for SIG.  */

__sighandler_t sigset (int sig, __sighandler_t disp)

{

    struct sigaction act, oact;

    sigset_t set;

#ifdef SIG_HOLD

    /* Handle SIG_HOLD first.  */

    if (disp == SIG_HOLD)

    {

        /* Create an empty signal set.  */

        if (__sigemptyset (&set) < 0)

            return SIG_ERR;

        /* Add the specified signal.  */

        if (__sigaddset (&set, sig) < 0)

            return SIG_ERR;

        /* Add the signal set to the current signal mask.  */

        if (sigprocmask (SIG_BLOCK, &set, NULL) < 0)

            return SIG_ERR;

        return SIG_HOLD;

    }

#endif  /* SIG_HOLD */

    /* Check signal extents to protect __sigismember.  */

    if (disp == SIG_ERR || sig < 1 || sig >= NSIG)

    {

        __set_errno (EINVAL);

        return SIG_ERR;

    }

    act.sa_handler = disp;

    if (__sigemptyset (&act.sa_mask) < 0)

        return SIG_ERR;

    act.sa_flags = 0;

    if (sigaction (sig, &act, &oact) < 0)

        return SIG_ERR;

    /* Create an empty signal set.  */

    if (__sigemptyset (&set) < 0)

        return SIG_ERR;

    /* Add the specified signal.  */

    if (__sigaddset (&set, sig) < 0)

        return SIG_ERR;

    /* Remove the signal set from the current signal mask.  */

    if (sigprocmask (SIG_UNBLOCK, &set, NULL) < 0)

        return SIG_ERR;

    return oact.sa_handler;

}