mirror of
https://sourceware.org/git/glibc.git
synced 2024-11-14 01:00:07 +00:00
144 lines
3.9 KiB
C
144 lines
3.9 KiB
C
/* Copyright (C) 1991,1993,1995-1998,2001,2002,2009,2011
|
|
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
|
|
|
|
#include <libio/libioP.h>
|
|
#define fflush(s) _IO_flush_all_lockp (0)
|
|
|
|
/* Exported variable to locate abort message in core files etc. */
|
|
struct abort_msg_s *__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)
|