lib/libc/stdlib/abort.c

   1 /*
   2  * Copyright (c) 1985, 1993
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   5  * Redistribution and use in source and binary forms, with or without
   6  * modification, are permitted provided that the following conditions
   7  * are met:
   8  * 1. Redistributions of source code must retain the above copyright
   9  *    notice, this list of conditions and the following disclaimer.
  10  * 2. Redistributions in binary form must reproduce the above copyright
  11  *    notice, this list of conditions and the following disclaimer in the
  12  *    documentation and/or other materials provided with the distribution.
  13  * 4. Neither the name of the University nor the names of its contributors
  14  *    may be used to endorse or promote products derived from this software
  15  *    without specific prior written permission.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  18  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  19  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  20  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  21  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  22  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  23  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  24  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  25  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  26  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  27  * SUCH DAMAGE.
  28  *
  29  * @(#)abort.c  8.1 (Berkeley) 6/4/93
  30  * $FreeBSD: src/lib/libc/stdlib/abort.c,v 1.11 2007/01/09 00:28:09 imp Exp $
  31  * $DragonFly: src/lib/libc/stdlib/abort.c,v 1.4 2005/11/20 12:37:48 swildner Exp $
  32  */
  33
  34 #include "namespace.h"
  35 #include <signal.h>
  36 #include <stdlib.h>
  37 #include <stddef.h>
  38 #include <unistd.h>
  39 #include <pthread.h>
  40 #include "un-namespace.h"
  41
  42 #include "libc_private.h"
  43
  44 void
  45 abort(void)
  46 {
  47         struct sigaction act;
  48
  49         /*
  50          * POSIX requires we flush stdio buffers on abort.
  51          * XXX ISO C requires that abort() be async-signal-safe.
  52          */
  53         if (__cleanup)
  54                 (*__cleanup)();
  55
  56         sigfillset(&act.sa_mask);
  57         /*
  58          * Don't block SIGABRT to give any handler a chance; we ignore
  59          * any errors -- ISO C doesn't allow abort to return anyway.
  60          */
  61         sigdelset(&act.sa_mask, SIGABRT);
  62         _sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
  63         raise(SIGABRT);
  64
  65         /*
  66          * If SIGABRT was ignored, or caught and the handler returns, do
  67          * it again, only harder.
  68          */
  69         act.sa_handler = SIG_DFL;
  70         act.sa_flags = 0;
  71         sigfillset(&act.sa_mask);
  72         _sigaction(SIGABRT, &act, NULL);
  73         sigdelset(&act.sa_mask, SIGABRT);
  74         _sigprocmask(SIG_SETMASK, &act.sa_mask, NULL);
  75         raise(SIGABRT);
  76         exit(1);
  77 }