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      1 /*	$OpenBSD: abort.c,v 1.14 2005/08/08 08:05:36 espie Exp $ */
      2 /*
      3  * Copyright (c) 1985 Regents of the University of California.
      4  * All rights reserved.
      5  *
      6  * Redistribution and use in source and binary forms, with or without
      7  * modification, are permitted provided that the following conditions
      8  * are met:
      9  * 1. Redistributions of source code must retain the above copyright
     10  *    notice, this list of conditions and the following disclaimer.
     11  * 2. Redistributions in binary form must reproduce the above copyright
     12  *    notice, this list of conditions and the following disclaimer in the
     13  *    documentation and/or other materials provided with the distribution.
     14  * 3. Neither the name of the University nor the names of its contributors
     15  *    may be used to endorse or promote products derived from this software
     16  *    without specific prior written permission.
     17  *
     18  * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
     19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
     20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
     21  * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
     22  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
     23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
     24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
     25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
     26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     28  * SUCH DAMAGE.
     29  */
     30 
     31 #include <signal.h>
     32 #include <stdlib.h>
     33 #include <unistd.h>
     34 #include "thread_private.h"
     35 #include "atexit.h"
     36 
     37 #ifdef __arm__
     38 __LIBC_HIDDEN__ void
     39 __libc_android_abort(void)
     40 #else
     41 void
     42 abort(void)
     43 #endif
     44 {
     45 	struct atexit *p = __atexit;
     46 	static int cleanup_called = 0;
     47 	sigset_t mask;
     48 
     49 
     50 	sigfillset(&mask);
     51 	/*
     52 	 * don't block SIGABRT to give any handler a chance; we ignore
     53 	 * any errors -- X311J doesn't allow abort to return anyway.
     54 	 */
     55 	sigdelset(&mask, SIGABRT);
     56     /* temporary, so deliberate seg fault can be caught by debuggerd */
     57 	sigdelset(&mask, SIGSEGV);
     58     /* -- */
     59 	(void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
     60 
     61 	/*
     62 	 * POSIX requires we flush stdio buffers on abort
     63 	 */
     64 	if (cleanup_called == 0) {
     65 		while (p != NULL && p->next != NULL)
     66 			p = p->next;
     67 		/* the check for fn_dso == NULL is mostly paranoia */
     68 		if (p != NULL && p->fns[0].fn_dso == NULL &&
     69 		    p->fns[0].fn_ptr.std_func != NULL) {
     70 			cleanup_called = 1;
     71 			(*p->fns[0].fn_ptr.std_func)();
     72 		}
     73 	}
     74 
     75     /* temporary, for bug hunting */
     76     /* seg fault seems to produce better debuggerd results than SIGABRT */
     77 #ifdef __mips__
     78     /* An access that will generate SIGSEGV rather than SIGBUS. */
     79     *((char*)0xdeadc0c0) = 39;
     80 #else
     81     *((char*)0xdeadbaad) = 39;
     82 #endif
     83     /* -- */
     84 
     85 	(void)kill(getpid(), SIGABRT);
     86 
     87 	/*
     88 	 * if SIGABRT ignored, or caught and the handler returns, do
     89 	 * it again, only harder.
     90 	 */
     91         {
     92             struct sigaction sa;
     93 
     94             sa.sa_handler = SIG_DFL;
     95             sa.sa_flags   = SA_RESTART;
     96             sigemptyset(&sa.sa_mask);
     97 
     98             (void)sigaction( SIGABRT, &sa, &sa );
     99         }
    100 
    101 	(void)sigprocmask(SIG_SETMASK, &mask, (sigset_t *)NULL);
    102 	(void)kill(getpid(), SIGABRT);
    103 	_exit(1);
    104 }
    105