stdlib/abort.c

   1 /*
   2  * Copyright (c) 1999 Apple Computer, Inc. All rights reserved.
   3  *
   4  * @APPLE_LICENSE_HEADER_START@
   5  *
   6  * The contents of this file constitute Original Code as defined in and
   7  * are subject to the Apple Public Source License Version 1.1 (the
   8  * "License").  You may not use this file except in compliance with the
   9  * License.  Please obtain a copy of the License at
  10  * http://www.apple.com/publicsource and read it before using this file.
  11  *
  12  * This Original Code and all software distributed under the License are
  13  * distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY KIND, EITHER
  14  * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
  15  * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE OR NON-INFRINGEMENT.  Please see the
  17  * License for the specific language governing rights and limitations
  18  * under the License.
  19  *
  20  * @APPLE_LICENSE_HEADER_END@
  21  */
  22 /*
  23  * Copyright (c) 1985, 1993
  24  *      The Regents of the University of California.  All rights reserved.
  25  *
  26  * Redistribution and use in source and binary forms, with or without
  27  * modification, are permitted provided that the following conditions
  28  * are met:
  29  * 1. Redistributions of source code must retain the above copyright
  30  *    notice, this list of conditions and the following disclaimer.
  31  * 2. Redistributions in binary form must reproduce the above copyright
  32  *    notice, this list of conditions and the following disclaimer in the
  33  *    documentation and/or other materials provided with the distribution.
  34  * 3. All advertising materials mentioning features or use of this software
  35  *    must display the following acknowledgement:
  36  *      This product includes software developed by the University of
  37  *      California, Berkeley and its contributors.
  38  * 4. Neither the name of the University nor the names of its contributors
  39  *    may be used to endorse or promote products derived from this software
  40  *    without specific prior written permission.
  41  *
  42  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
  43  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  44  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  45  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
  46  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  47  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  48  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  49  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  50  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  51  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  52  * SUCH DAMAGE.
  53  */
  54
  55
  56 #include <sys/signal.h>
  57 #include <stdlib.h>
  58 #include <stddef.h>
  59 #include <unistd.h>
  60
  61 void
  62 abort()
  63 {
  64         int mypid = getpid();
  65         volatile long i;
  66         volatile long *excp = 0;
  67         sigset_t mask;
  68
  69         sigfillset(&mask);
  70         /*
  71          * don't block SIGABRT to give any handler a chance; we ignore
  72          * any errors -- X3J11 doesn't allow abort to return anyway.
  73          */
  74         sigdelset(&mask, SIGABRT);
  75         (void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
  76         (void)kill(mypid, SIGABRT);
  77
  78         /*
  79          * if SIGABRT ignored, or caught and the handler returns, do
  80          * it again, only harder.
  81          */
  82         (void)signal(SIGABRT, SIG_DFL);
  83         (void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
  84         (void)kill(mypid, SIGABRT);
  85
  86         i = *excp;              /* still no joy; cause a processor trap */
  87         i = *++excp;            /* maybe an unaligned address will do it */
  88
  89         /* okay, let's try to write text space */
  90         excp = (volatile long *)&abort;
  91         *excp = ~*excp;
  92         *excp = ~*excp;
  93
  94         i /= 0;                 /* this time for sure! */
  95
  96         /* increasing desperation; try signals until one of them sticks */
  97         (void)kill(mypid, SIGILL);
  98         (void)kill(mypid, SIGBUS);
  99
 100         /* almost last resort */
 101         _exit(1);
 102
 103         /* if _exit returns, do not return */
 104         for (;;)
 105                 sleep(600);
 106 }