/*      $NetBSD: abort.c,v 1.15 2012/06/08 11:15:26 abs Exp $   */

/*
 * Copyright (c) 1985, 1993
 *      The Regents of the University of California.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 * 3. Neither the name of the University nor the names of its contributors
 *    may be used to endorse or promote products derived from this software
 *    without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 */

#include <sys/cdefs.h>
#if defined(LIBC_SCCS) && !defined(lint)
#if 0
static char sccsid[] = "@(#)abort.c     8.1 (Berkeley) 6/4/93";
#else
__RCSID("$NetBSD: abort.c,v 1.15 2012/06/08 11:15:26 abs Exp $");
#endif
#endif /* LIBC_SCCS and not lint */

#include "namespace.h"
#include <signal.h>
#include <stdlib.h>
#include <unistd.h>

extern void (*__cleanup)(void);
static int aborting = 0;

void
abort(void)
{
        sigset_t mask;

        sigfillset(&mask);
        /*
         * don't block SIGABRT to give any handler a chance; we ignore
         * any errors -- X311J doesn't allow abort to return anyway.
         */
        sigdelset(&mask, SIGABRT);
        (void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);

        /* 
         * POSIX.1 requires that stdio buffers be flushed on abort.
         * We ensure the cleanup routines are only called once in
         * case the user calls abort() in a SIGABRT handler.
         */
        if (!aborting) {
                aborting = 1;

                if (__cleanup)
                        (*__cleanup)();
        }

        (void)raise(SIGABRT);

        /*
         * if SIGABRT ignored, or caught and the handler returns, do
         * it again, only harder.
         */
        (void)signal(SIGABRT, SIG_DFL);
        (void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
        (void)raise(SIGABRT);
        _exit(1);
}