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/* Copyright (C) 1991 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 Library General Public License as
published by the Free Software Foundation; either version 2 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
Library General Public License for more details.
You should have received a copy of the GNU Library General Public
License along with the GNU C Library; see the file COPYING.LIB. If
not, write to the Free Software Foundation, Inc., 675 Mass Ave,
Cambridge, MA 02139, USA. */
/* Hacked up for uClibc by Erik Andersen */
#include <features.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <signal.h>
#include <errno.h>
/* Defeat compiler optimization which assumes function addresses are never NULL */
static __always_inline int not_null_ptr(const void *p)
{
const void *q;
__asm__ (""
: "=r" (q) /* output */
: "0" (p) /* input */
);
return q != 0;
}
/* Our last ditch effort to commit suicide */
#ifdef __UCLIBC_ABORT_INSTRUCTION__
# define ABORT_INSTRUCTION __asm__(__UCLIBC_ABORT_INSTRUCTION__)
#else
# define ABORT_INSTRUCTION
# warning "no abort instruction defined for your arch"
#endif
static smallint been_there_done_that = 0;
/* Be prepared in case multiple threads try to abort() */
#include <bits/uClibc_mutex.h>
__UCLIBC_MUTEX_STATIC(mylock, PTHREAD_RECURSIVE_MUTEX_INITIALIZER_NP);
/* Cause an abnormal program termination with core-dump */
void abort(void)
{
sigset_t sigs;
/* Make sure we acquire the lock before proceeding */
__UCLIBC_MUTEX_LOCK_CANCEL_UNSAFE(mylock);
/* Unmask SIGABRT to be sure we can get it */
__sigemptyset(&sigs);
__sigaddset(&sigs, SIGABRT);
sigprocmask(SIG_UNBLOCK, &sigs, NULL);
while (1) {
/* Try to suicide with a SIGABRT */
if (been_there_done_that == 0) {
been_there_done_that++;
#ifdef __UCLIBC_HAS_STDIO_SHUTDOWN_ON_ABORT__
/* If we are using stdio, try to shut it down. At the very least,
* this will attempt to commit all buffered writes. It may also
* unbuffer all writable files, or close them outright.
* Check the stdio routines for details. */
if (not_null_ptr(_stdio_term)) {
_stdio_term();
}
#endif
abort_it:
__UCLIBC_MUTEX_UNLOCK_CANCEL_UNSAFE(mylock);
raise(SIGABRT);
__UCLIBC_MUTEX_LOCK_CANCEL_UNSAFE(mylock);
}
/* Still here? Try to remove any signal handlers */
if (been_there_done_that == 1) {
struct sigaction act;
been_there_done_that++;
memset(&act, '\0', sizeof(struct sigaction));
if (SIG_DFL) /* if it's constant zero, already done */
act.sa_handler = SIG_DFL;
__sigfillset(&act.sa_mask);
sigaction(SIGABRT, &act, NULL);
goto abort_it;
}
/* Still here? Try to suicide with an illegal instruction */
if (been_there_done_that == 2) {
been_there_done_that++;
ABORT_INSTRUCTION;
}
/* Still here? Try to at least exit */
if (been_there_done_that == 3) {
been_there_done_that++;
_exit(127);
}
/* Still here? We're screwed. Sleepy time. Good night. */
while (1)
/* Try for ever and ever */
ABORT_INSTRUCTION;
}
}
libc_hidden_def(abort)
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