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/*
Unix SMB/CIFS implementation.
Critical Fault handling
Copyright (C) Andrew Tridgell 1992-1998
Copyright (C) Tim Prouty 2009
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program 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 General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "system/filesys.h"
#include "version.h"
#ifdef HAVE_SYS_SYSCTL_H
#include <sys/sysctl.h>
#endif
#ifdef HAVE_SYS_PRCTL_H
#include <sys/prctl.h>
#endif
static struct {
bool disabled;
smb_panic_handler_t panic_handler;
} fault_state;
/*******************************************************************
setup variables used for fault handling
********************************************************************/
void fault_configure(smb_panic_handler_t panic_handler)
{
fault_state.panic_handler = panic_handler;
}
/**
disable setting up fault handlers
This is used for the bind9 dlz module, as we
don't want a Samba module in bind9 to override the bind
fault handling
**/
_PUBLIC_ void fault_setup_disable(void)
{
fault_state.disabled = true;
}
/*******************************************************************
report a fault
********************************************************************/
static void fault_report(int sig)
{
static int counter;
if (counter) _exit(1);
counter++;
DEBUGSEP(0);
DEBUG(0,("INTERNAL ERROR: Signal %d in pid %d (%s)",sig,(int)getpid(),SAMBA_VERSION_STRING));
DEBUG(0,("\nPlease read the Trouble-Shooting section of the Samba HOWTO\n"));
DEBUGSEP(0);
smb_panic("internal error");
/* smb_panic() never returns, so this is really redundant */
exit(1);
}
/****************************************************************************
catch serious errors
****************************************************************************/
static void sig_fault(int sig)
{
fault_report(sig);
}
/*******************************************************************
setup our fault handlers
********************************************************************/
void fault_setup(void)
{
if (fault_state.disabled) {
return;
}
#if !defined(HAVE_DISABLE_FAULT_HANDLING)
#ifdef SIGSEGV
CatchSignal(SIGSEGV, sig_fault);
#endif
#ifdef SIGBUS
CatchSignal(SIGBUS, sig_fault);
#endif
#ifdef SIGABRT
CatchSignal(SIGABRT, sig_fault);
#endif
#endif
}
_PUBLIC_ const char *panic_action = NULL;
/*
default smb_panic() implementation
*/
static void smb_panic_default(const char *why)
{
#if defined(HAVE_PRCTL) && defined(PR_SET_PTRACER)
/*
* Make sure all children can attach a debugger.
*/
prctl(PR_SET_PTRACER, getpid(), 0, 0, 0);
#endif
if (panic_action && *panic_action) {
char cmdstring[200];
if (strlcpy(cmdstring, panic_action, sizeof(cmdstring)) < sizeof(cmdstring)) {
int result;
char pidstr[20];
snprintf(pidstr, sizeof(pidstr), "%d", (int) getpid());
all_string_sub(cmdstring, "%d", pidstr, sizeof(cmdstring));
DEBUG(0, ("smb_panic(): calling panic action [%s]\n", cmdstring));
result = system(cmdstring);
if (result == -1)
DEBUG(0, ("smb_panic(): fork failed in panic action: %s\n",
strerror(errno)));
else
DEBUG(0, ("smb_panic(): action returned status %d\n",
WEXITSTATUS(result)));
}
}
DEBUG(0,("PANIC: %s\n", why));
#ifdef SIGABRT
CatchSignal(SIGABRT, SIG_DFL);
#endif
abort();
}
/**
Something really nasty happened - panic !
**/
_PUBLIC_ void smb_panic(const char *why)
{
if (fault_state.panic_handler) {
fault_state.panic_handler(why);
_exit(1);
}
smb_panic_default(why);
}
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