lib/libc/stdlib/abort.c

   1 /*      $NetBSD: abort.c,v 1.12 2003/08/07 16:43:37 agc Exp $   */
   2
   3 /*
   4  * Copyright (c) 1985, 1993
   5  *      The Regents of the University of California.  All rights reserved.
   6  *
   7  * Redistribution and use in source and binary forms, with or without
   8  * modification, are permitted provided that the following conditions
   9  * are met:
  10  * 1. Redistributions of source code must retain the above copyright
  11  *    notice, this list of conditions and the following disclaimer.
  12  * 2. Redistributions in binary form must reproduce the above copyright
  13  *    notice, this list of conditions and the following disclaimer in the
  14  *    documentation and/or other materials provided with the distribution.
  15  * 3. Neither the name of the University nor the names of its contributors
  16  *    may be used to endorse or promote products derived from this software
  17  *    without specific prior written permission.
  18  *
  19  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  20  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  21  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  22  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  23  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  24  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  25  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  26  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  27  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  28  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  29  * SUCH DAMAGE.
  30  */
  31
  32 #include <sys/cdefs.h>
  33 #if defined(LIBC_SCCS) && !defined(lint)
  34 #if 0
  35 static char sccsid[] = "@(#)abort.c     8.1 (Berkeley) 6/4/93";
  36 #else
  37 __RCSID("$NetBSD: abort.c,v 1.12 2003/08/07 16:43:37 agc Exp $");
  38 #endif
  39 #endif /* LIBC_SCCS and not lint */
  40
  41 #include "namespace.h"
  42 #include <signal.h>
  43 #include <stdlib.h>
  44 #include <unistd.h>
  45
  46 extern void (*__cleanup) __P((void));
  47 static int aborting = 0;
  48
  49 void
  50 abort()
  51 {
  52         sigset_t mask;
  53
  54         sigfillset(&mask);
  55         /*
  56          * don't block SIGABRT to give any handler a chance; we ignore
  57          * any errors -- X311J doesn't allow abort to return anyway.
  58          */
  59         sigdelset(&mask, SIGABRT);
  60         (void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
  61
  62         /*
  63          * POSIX.1 requires that stdio buffers be flushed on abort.
  64          * We ensure the cleanup routines are only called once in
  65          * case the user calls abort() in a SIGABRT handler.
  66          */
  67         if (!aborting) {
  68                 aborting = 1;
  69
  70                 if (__cleanup)
  71                         (*__cleanup)();
  72         }
  73
  74         (void)raise(SIGABRT);
  75
  76         /*
  77          * if SIGABRT ignored, or caught and the handler returns, do
  78          * it again, only harder.
  79          */
  80         (void)signal(SIGABRT, SIG_DFL);
  81         (void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
  82         (void)raise(SIGABRT);
  83         _exit(1);
  84 }