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glibc/stdlib/abort.c
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/* Copyright (C) 1991,93,1995-1998,2001,02,2009 Free Software Foundation, Inc. | |
This file is part of the GNU C Library. | |
The GNU C Library is free software; you can redistribute it and/or | |
modify it under the terms of the GNU Lesser General Public | |
License as published by the Free Software Foundation; either | |
version 2.1 of the License, or (at your option) any later version. | |
The GNU C Library is distributed in the hope that it will be useful, | |
but WITHOUT ANY WARRANTY; without even the implied warranty of | |
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
Lesser General Public License for more details. | |
You should have received a copy of the GNU Lesser General Public | |
License along with the GNU C Library; if not, write to the Free | |
Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA | |
02111-1307 USA. */ | |
#include <bits/libc-lock.h> | |
#include <signal.h> | |
#include <stdio.h> | |
#include <stdlib.h> | |
#include <string.h> | |
#include <unistd.h> | |
/* Try to get a machine dependent instruction which will make the | |
program crash. This is used in case everything else fails. */ | |
#include <abort-instr.h> | |
#ifndef ABORT_INSTRUCTION | |
/* No such instruction is available. */ | |
# define ABORT_INSTRUCTION | |
#endif | |
#ifdef USE_IN_LIBIO | |
# include <libio/libioP.h> | |
# define fflush(s) _IO_flush_all_lockp (0) | |
#endif | |
/* Exported variable to locate abort message in core files etc. */ | |
char *__abort_msg __attribute__ ((nocommon)); | |
libc_hidden_def (__abort_msg) | |
/* We must avoid to run in circles. Therefore we remember how far we | |
already got. */ | |
static int stage; | |
/* We should be prepared for multiple threads trying to run abort. */ | |
__libc_lock_define_initialized_recursive (static, lock); | |
/* Cause an abnormal program termination with core-dump. */ | |
void | |
abort (void) | |
{ | |
struct sigaction act; | |
sigset_t sigs; | |
/* First acquire the lock. */ | |
__libc_lock_lock_recursive (lock); | |
/* Now it's for sure we are alone. But recursive calls are possible. */ | |
/* Unlock SIGABRT. */ | |
if (stage == 0) | |
{ | |
++stage; | |
if (__sigemptyset (&sigs) == 0 && | |
__sigaddset (&sigs, SIGABRT) == 0) | |
__sigprocmask (SIG_UNBLOCK, &sigs, (sigset_t *) NULL); | |
} | |
/* Flush all streams. We cannot close them now because the user | |
might have registered a handler for SIGABRT. */ | |
if (stage == 1) | |
{ | |
++stage; | |
fflush (NULL); | |
} | |
/* Send signal which possibly calls a user handler. */ | |
if (stage == 2) | |
{ | |
/* This stage is special: we must allow repeated calls of | |
`abort' when a user defined handler for SIGABRT is installed. | |
This is risky since the `raise' implementation might also | |
fail but I don't see another possibility. */ | |
int save_stage = stage; | |
stage = 0; | |
__libc_lock_unlock_recursive (lock); | |
raise (SIGABRT); | |
__libc_lock_lock_recursive (lock); | |
stage = save_stage + 1; | |
} | |
/* There was a handler installed. Now remove it. */ | |
if (stage == 3) | |
{ | |
++stage; | |
memset (&act, '\0', sizeof (struct sigaction)); | |
act.sa_handler = SIG_DFL; | |
__sigfillset (&act.sa_mask); | |
act.sa_flags = 0; | |
__sigaction (SIGABRT, &act, NULL); | |
} | |
/* Now close the streams which also flushes the output the user | |
defined handler might has produced. */ | |
if (stage == 4) | |
{ | |
++stage; | |
__fcloseall (); | |
} | |
/* Try again. */ | |
if (stage == 5) | |
{ | |
++stage; | |
raise (SIGABRT); | |
} | |
/* Now try to abort using the system specific command. */ | |
if (stage == 6) | |
{ | |
++stage; | |
ABORT_INSTRUCTION; | |
} | |
/* If we can't signal ourselves and the abort instruction failed, exit. */ | |
if (stage == 7) | |
{ | |
++stage; | |
_exit (127); | |
} | |
/* If even this fails try to use the provided instruction to crash | |
or otherwise make sure we never return. */ | |
while (1) | |
/* Try for ever and ever. */ | |
ABORT_INSTRUCTION; | |
} | |
libc_hidden_def (abort) |