+++ /dev/null
-/*
- 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 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/wait.h"
-#include "system/filesys.h"
-
-/**
- * @file
- * @brief Fault handling
- */
-
-/* the registered fault handler */
-static struct {
- const char *name;
- void (*fault_handler)(int sig);
-} fault_handlers;
-
-static const char *progname;
-
-#ifdef HAVE_BACKTRACE
-#include <execinfo.h>
-#elif HAVE_LIBEXC_H
-#include <libexc.h>
-#endif
-
-/**
- * Write backtrace to debug log
- */
-_PUBLIC_ void call_backtrace(void)
-{
-#ifdef HAVE_BACKTRACE
-#ifndef BACKTRACE_STACK_SIZE
-#define BACKTRACE_STACK_SIZE 64
-#endif
- 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);
-
- DEBUG(0, ("BACKTRACE: %lu stack frames:\n",
- (unsigned long)backtrace_size));
-
- if (backtrace_strings) {
- int i;
-
- for (i = 0; i < backtrace_size; i++)
- DEBUGADD(0, (" #%u %s\n", i, backtrace_strings[i]));
-
- /* Leak the backtrace_strings, rather than risk what free() might do */
- }
-
-#elif HAVE_LIBEXC
-
-#define NAMESIZE 32 /* Arbitrary */
-#ifndef BACKTRACE_STACK_SIZE
-#define BACKTRACE_STACK_SIZE 64
-#endif
-
- /* The IRIX libexc library provides an API for unwinding the stack. See
- * libexc(3) for details. Apparantly trace_back_stack leaks memory, but
- * since we are about to abort anyway, it hardly matters.
- *
- * Note that if we paniced due to a SIGSEGV or SIGBUS (or similar) this
- * will fail with a nasty message upon failing to open the /proc entry.
- */
- {
- uint64_t addrs[BACKTRACE_STACK_SIZE];
- char * names[BACKTRACE_STACK_SIZE];
- char namebuf[BACKTRACE_STACK_SIZE * NAMESIZE];
-
- int i;
- int levels;
-
- ZERO_ARRAY(addrs);
- ZERO_ARRAY(names);
- ZERO_ARRAY(namebuf);
-
- for (i = 0; i < BACKTRACE_STACK_SIZE; i++) {
- names[i] = namebuf + (i * NAMESIZE);
- }
-
- levels = trace_back_stack(0, addrs, names,
- BACKTRACE_STACK_SIZE, NAMESIZE);
-
- DEBUG(0, ("BACKTRACE: %d stack frames:\n", levels));
- for (i = 0; i < levels; i++) {
- DEBUGADD(0, (" #%d 0x%llx %s\n", i, addrs[i], names[i]));
- }
- }
-#undef NAMESIZE
-#else
- DEBUG(0, ("call_backtrace: not implemented\n"));
-#endif
-}
-
-_PUBLIC_ const char *panic_action = NULL;
-_PUBLIC_ void (*pre_panic_action_hook)(void) = NULL;
-_PUBLIC_ void (*post_panic_action_hook)(void) = NULL;
-
-/**
- Something really nasty happened - panic !
-**/
-_PUBLIC_ void smb_panic(const char *why)
-{
- int result;
-
- if (panic_action && *panic_action) {
- char pidstr[20];
- char cmdstring[200];
- strlcpy(cmdstring, panic_action, sizeof(cmdstring));
- snprintf(pidstr, sizeof(pidstr), "%u", getpid());
- all_string_sub(cmdstring, "%PID%", pidstr, sizeof(cmdstring));
- if (progname) {
- all_string_sub(cmdstring, "%PROG%", progname, sizeof(cmdstring));
- }
- DEBUG(0, ("smb_panic(): calling panic action [%s]\n", cmdstring));
-
- if (pre_panic_action_hook) {
- pre_panic_action_hook();
- }
-
- result = system(cmdstring);
-
- if (post_panic_action_hook) {
- post_panic_action_hook();
- }
-
- 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));
-
- call_backtrace();
-
-#ifdef SIGABRT
- CatchSignal(SIGABRT, SIG_DFL);
-#endif
- abort();
-}
-
-/**
-report a fault
-**/
-_NORETURN_ static void fault_report(int sig)
-{
- static int counter;
-
- if (counter) _exit(1);
-
- DEBUG(0,("=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n"));
- DEBUG(0,("INTERNAL ERROR: Signal %d in %s pid %d",sig, progname, (int)getpid()));
- DEBUG(0,("\nPlease read the file BUGS.txt in the distribution\n"));
- DEBUG(0,("=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=-=\n"));
-
- smb_panic("internal error");
-
- exit(1);
-}
-
-/**
-catch serious errors
-**/
-_NORETURN_ static void sig_fault(int sig)
-{
- if (fault_handlers.fault_handler) {
- /* we have a fault handler, call it. It may not return. */
- fault_handlers.fault_handler(sig);
- }
- /* If it returns or doesn't exist, use regular reporter */
- fault_report(sig);
-}
-
-/**
-setup our fault handlers
-**/
-_PUBLIC_ void fault_setup(void)
-{
-#ifdef SIGSEGV
- CatchSignal(SIGSEGV, sig_fault);
-#endif
-#ifdef SIGBUS
- CatchSignal(SIGBUS, sig_fault);
-#endif
-#ifdef SIGABRT
- CatchSignal(SIGABRT, sig_fault);
-#endif
-#ifdef SIGFPE
- CatchSignal(SIGFPE, sig_fault);
-#endif
-}
-
-/**
- register a fault handler.
- Should only be called once in the execution of smbd.
-*/
-_PUBLIC_ bool register_fault_handler(const char *name,
- void (*fault_handler)(int sig))
-{
- if (fault_handlers.name != NULL) {
- /* it's already registered! */
- DEBUG(2,("fault handler '%s' already registered - failed '%s'\n",
- fault_handlers.name, name));
- return false;
- }
-
- fault_handlers.name = name;
- fault_handlers.fault_handler = fault_handler;
-
- DEBUG(2,("fault handler '%s' registered\n", name));
- return true;
-}
git.samba.org / vlendec / samba-autobuild / .git / blobdiff