glibc/sysdeps/generic/abort.c
Ulrich Drepper 5b82669229 update from main archive 970124
Sat Jan 25 02:05:19 1997  Eirik Fuller  <eirik@netcom.com>

	* sysdeps/unix/sysv/linux/alpha/ioperm.c: Rename T2_SPARSE_BASE and
	T2_DENSE_BASE to T2_SPARSE_MEM and T2_DENSE_MEM resp.

Thu Jan 23 11:13:46 1997  Andreas Schwab  <schwab@issan.informatik.uni-dortmund.de>

	* sysdeps/unix/sysv/linux/usleep.c: Normalize the time
	specification.

Fri Jan 24 14:33:45 1997  Ulrich Drepper  <drepper@cygnus.com>

	* sysdeps/generic/socketbits.h: Also make SOCK_* constants available
	as macros so that #ifdef works.
	* sysdeps/unix/sysv/linux/socketbits.h: Likewise.

1997-01-23  Paul Eggert  <eggert@twinsun.com>

	* login/utmp_db.c, manual/time.texi, shlib-versions, sunrpc/rpc/svc.h,
	sunrpc/rpcsvc/sm_inter.x, sysdeps/generic/abort.c,
	sysdeps/libm-ieee754/e_sinhl.c, sysdeps/unix/sysv/linux/net/route.h,
	sysdeps/unix/sysv/linux/sparc/__sigtrampoline.S: Spell fixes.
1997-01-25 02:36:37 +00:00

135 lines
3.6 KiB
C

/* Copyright (C) 1991, 1993, 1995, 1996, 1997 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., 59 Temple Place - Suite 330,
Boston, MA 02111-1307, USA. */
#include <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
/* 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;
}