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135 lines
3.6 KiB
C
135 lines
3.6 KiB
C
/* Copyright (C) 1991, 1993, 1995, 1996, 1997 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public License as
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published by the Free Software Foundation; either version 2 of the
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License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with the GNU C Library; see the file COPYING.LIB. If not,
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write to the Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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Boston, MA 02111-1307, USA. */
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#include <libc-lock.h>
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#include <signal.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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/* Try to get a machine dependent instruction which will make the
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program crash. This is used in case everything else fails. */
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#include <abort-instr.h>
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#ifndef ABORT_INSTRUCTION
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/* No such instruction is available. */
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# define ABORT_INSTRUCTION
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#endif
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/* We must avoid to run in circles. Therefore we remember how far we
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already got. */
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static int stage;
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/* We should be prepared for multiple threads trying to run abort. */
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__libc_lock_define_initialized_recursive (static, lock);
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/* Cause an abnormal program termination with core-dump. */
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void
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abort (void)
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{
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struct sigaction act;
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sigset_t sigs;
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/* First acquire the lock. */
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__libc_lock_lock_recursive (lock);
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/* Now it's for sure we are alone. But recursive calls are possible. */
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/* Unlock SIGABRT. */
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if (stage == 0)
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{
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++stage;
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if (__sigemptyset (&sigs) == 0 &&
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__sigaddset (&sigs, SIGABRT) == 0)
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__sigprocmask (SIG_UNBLOCK, &sigs, (sigset_t *) NULL);
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}
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/* Flush all streams. We cannot close them now because the user
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might have registered a handler for SIGABRT. */
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if (stage == 1)
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{
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++stage;
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fflush (NULL);
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}
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/* Send signal which possibly calls a user handler. */
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if (stage == 2)
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{
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/* This stage is special: we must allow repeated calls of
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`abort' when a user defined handler for SIGABRT is installed.
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This is risky since the `raise' implementation might also
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fail but I don't see another possiblity. */
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int save_stage = stage;
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stage = 0;
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__libc_lock_unlock_recursive (lock);
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raise (SIGABRT);
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__libc_lock_lock_recursive (lock);
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stage = save_stage + 1;
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}
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/* There was a handler installed. Now remove it. */
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if (stage == 3)
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{
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++stage;
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memset (&act, '\0', sizeof (struct sigaction));
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act.sa_handler = SIG_DFL;
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__sigfillset (&act.sa_mask);
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act.sa_flags = 0;
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__sigaction (SIGABRT, &act, NULL);
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}
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/* Now close the streams which also flushes the output the user
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defined handler might has produced. */
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if (stage == 4)
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{
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++stage;
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__fcloseall ();
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}
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/* Try again. */
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if (stage == 5)
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{
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++stage;
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raise (SIGABRT);
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}
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/* Now try to abort using the system specific command. */
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if (stage == 6)
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{
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++stage;
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ABORT_INSTRUCTION;
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}
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/* If we can't signal ourselves and the abort instruction failed, exit. */
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if (stage == 7)
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{
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++stage;
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_exit (127);
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}
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/* If even this fails try to use the provided instruction to crash
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or otherwise make sure we never return. */
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while (1)
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/* Try for ever and ever. */
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ABORT_INSTRUCTION;
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}
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