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/* Copyright (C) 1992, 1994, 1996 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 <stddef.h>

#include <signal.h>

#include <errno.h>

/* If INTERRUPT is nonzero, make signal SIG interrupt system calls

   (causing them to fail with EINTR); if INTERRUPT is zero, make system

   calls be restarted after signal SIG.  */

int siginterrupt (int sig, int interrupt)

{

#ifdef  SA_RESTART

    extern sigset_t _sigintr;   /* Defined in signal.c.  */

    struct sigaction action;

    if (sigaction (sig, (struct sigaction *) NULL, &action) < 0)

        return -1;

    if (interrupt)

    {

        __sigaddset (&_sigintr, sig);

        action.sa_flags &= ~SA_RESTART;

    }

    else

    {

        __sigdelset (&_sigintr, sig);

        action.sa_flags |= SA_RESTART;

    }

    if (sigaction (sig, &action, (struct sigaction *) NULL) < 0)

        return -1;

    return 0;

#else

    __set_errno (ENOSYS);

    return -1;

#endif

}