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/*
Unix SMB/CIFS implementation.
Critical Fault handling
Copyright (C) Andrew Tridgell 1992-1998
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 2 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, write to the Free Software
Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
*/
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#include <sys/types.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <signal.h>
#ifdef HAVE_BACKTRACE_SYMBOLS
#include <execinfo.h>
#endif
#include <atalk/logger.h>
#ifndef SIGNAL_CAST
#define SIGNAL_CAST (RETSIGTYPE (*)(int))
#endif
#ifndef SAFE_FREE /* Oh no this is also defined in tdb.h */
#define SAFE_FREE(x) do { if ((x) != NULL) {free(x); x=NULL;} } while(0)
#endif
#define BACKTRACE_STACK_SIZE 64
static void (*cont_fn)(void *);
/*******************************************************************
Catch a signal. This should implement the following semantics:
1) The handler remains installed after being called.
2) The signal should be blocked during handler execution.
********************************************************************/
static void (*CatchSignal(int signum,void (*handler)(int )))(int)
{
#ifdef HAVE_SIGACTION
struct sigaction act;
struct sigaction oldact;
ZERO_STRUCT(act);
act.sa_handler = handler;
#if 0
/*
* We *want* SIGALRM to interrupt a system call.
*/
if(signum != SIGALRM)
act.sa_flags = SA_RESTART;
#endif
sigemptyset(&act.sa_mask);
sigaddset(&act.sa_mask,signum);
sigaction(signum,&act,&oldact);
return oldact.sa_handler;
#else /* !HAVE_SIGACTION */
/* FIXME: need to handle sigvec and systems with broken signal() */
return signal(signum, handler);
#endif
}
/*******************************************************************
Something really nasty happened - panic !
********************************************************************/
void netatalk_panic(const char *why)
{
#ifdef HAVE_BACKTRACE_SYMBOLS
void *backtrace_stack[BACKTRACE_STACK_SIZE];
size_t backtrace_size;
char **backtrace_strings;
/* get the backtrace (stack frames) */
backtrace_size = backtrace(backtrace_stack,BACKTRACE_STACK_SIZE);
backtrace_strings = backtrace_symbols(backtrace_stack, backtrace_size);
LOG(log_severe, logtype_default, "BACKTRACE: %d stack frames:", backtrace_size);
if (backtrace_strings) {
size_t i;
for (i = 0; i < backtrace_size; i++)
LOG(log_severe, logtype_default, " #%u %s", i, backtrace_strings[i]);
SAFE_FREE(backtrace_strings);
}
#endif
}
/*******************************************************************
report a fault
********************************************************************/
static void fault_report(int sig)
{
static int counter;
if (counter)
abort();
counter++;
LOG(log_severe, logtype_default, "===============================================================");
LOG(log_severe, logtype_default, "INTERNAL ERROR: Signal %d in pid %d (%s)",sig,(int)getpid(),VERSION);
LOG(log_severe, logtype_default, "===============================================================");
netatalk_panic("internal error");
if (cont_fn) {
cont_fn(NULL);
#ifdef SIGSEGV
CatchSignal(SIGSEGV,SIGNAL_CAST SIG_DFL);
#endif
#ifdef SIGBUS
CatchSignal(SIGBUS,SIGNAL_CAST SIG_DFL);
#endif
return; /* this should cause a core dump */
}
abort();
}
/****************************************************************************
catch serious errors
****************************************************************************/
static void sig_fault(int sig)
{
fault_report(sig);
}
/*******************************************************************
setup our fault handlers
********************************************************************/
void fault_setup(void (*fn)(void *))
{
cont_fn = fn;
#ifdef SIGSEGV
CatchSignal(SIGSEGV,SIGNAL_CAST sig_fault);
#endif
#ifdef SIGBUS
CatchSignal(SIGBUS,SIGNAL_CAST sig_fault);
#endif
}
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