+++ /dev/null
-/*
- * author: David Frascone
- *
- * eCrash Implementation
- *
- * eCrash will allow you to capture stack traces in the
- * event of a crash, and write those traces to disk, stdout,
- * or any other file handle.
- *
- * modified to integrate closer into citadel by Wilfried Goesgens
- *
- * vim: ts=4
- *
- * This program is open source software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, version 3.
- *
- * 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.
- */
-
-#include "sysdep.h"
-#include <stdio.h>
-#include <unistd.h>
-#include <stdlib.h>
-#include <stdarg.h>
-#include <string.h>
-#include <fcntl.h>
-#include <syslog.h>
-#include <sys/types.h>
-#include <sys/stat.h>
-#include <pthread.h>
-#include <libcitadel.h>
-#include "server.h"
-#include "sysdep_decls.h"
-#include "support.h"
-#include "config.h"
-#include "citserver.h"
-#include "ecrash.h"
-
-#define NIY() printf("function not implemented yet!\n");
-#ifdef HAVE_BACKTRACE
-#include <execinfo.h>
-static eCrashParameters gbl_params;
-
-static int gbl_backtraceEntries;
-static void **gbl_backtraceBuffer;
-static char **gbl_backtraceSymbols;
-static int gbl_backtraceDoneFlag = 0;
-
-static void *stack_frames[50];
-static size_t size, NThread;
-static char **strings;
-
-/*
- * Private structures for our thread list
- */
-typedef struct thread_list_node{
- char *threadName;
- pthread_t thread;
- int backtraceSignal;
- sighandler_t oldHandler;
- struct thread_list_node *Next;
-} ThreadListNode;
-
-static pthread_mutex_t ThreadListMutex = PTHREAD_MUTEX_INITIALIZER;
-static ThreadListNode *ThreadList = NULL;
-
-/*********************************************************************
- *********************************************************************
- ** P R I V A T E F U N C T I O N S
- *********************************************************************
- ********************************************************************/
-
-
-/*!
- * Insert a node into our threadList
- *
- * @param name Text string indicating our thread
- * @param thread Our Thread Id
- * @param signo Signal to create backtrace with
- * @param old_handler Our old handler for signo
- *
- * @returns zero on success
- */
-static int addThreadToList(char *name, pthread_t thread,int signo,
- sighandler_t old_handler)
-{
- ThreadListNode *node;
-
- node = malloc(sizeof(ThreadListNode));
- if (!node) return -1;
-
- DPRINTF(ECRASH_DEBUG_VERBOSE,
- "Adding thread 0x%08x (%s)\n", (unsigned int)thread, name);
- node->threadName = strdup(name);
- node->thread = thread;
- node->backtraceSignal = signo;
- node->oldHandler = old_handler;
-
- /* And, add it to the list */
- pthread_mutex_lock(&ThreadListMutex);
- node->Next = ThreadList;
- ThreadList = node;
- pthread_mutex_unlock(&ThreadListMutex);
-
- return 0;
-
-} // addThreadToList
-
-/*!
- * Remove a node from our threadList
- *
- * @param thread Our Thread Id
- *
- * @returns zero on success
- */
-static int removeThreadFromList(pthread_t thread)
-{
- ThreadListNode *Probe, *Prev=NULL;
- ThreadListNode *Removed = NULL;
-
- DPRINTF(ECRASH_DEBUG_VERBOSE,
- "Removing thread 0x%08x from list . . .\n", (unsigned int)thread);
- pthread_mutex_lock(&ThreadListMutex);
- for (Probe=ThreadList;Probe != NULL; Probe = Probe->Next) {
- if (Probe->thread == thread) {
- // We found it! Unlink it and move on!
- Removed = Probe;
- if (Prev == NULL) { // head of list
- ThreadList = Probe->Next;
- } else {
- // Prev != null, so we need to link around ourselves.
- Prev->Next = Probe->Next;
- }
- Removed->Next = NULL;
- break;
- }
-
- Prev = Probe;
- }
- pthread_mutex_unlock(&ThreadListMutex);
-
- // Now, if something is in Removed, free it, and return success
- if (Removed) {
- DPRINTF(ECRASH_DEBUG_VERBOSE,
- " Found %s -- removing\n", Removed->threadName);
- // Reset the signal handler
- signal(Removed->backtraceSignal, Removed->oldHandler);
-
- // And free the allocated memory
- free (Removed->threadName);
- free (Removed);
-
- return 0;
- } else {
- DPRINTF(ECRASH_DEBUG_VERBOSE,
- " Not Found\n");
- return -1; // Not Found
- }
-} // removeThreadFromList
-
-/*!
- * Print out a line of output to all our destinations
- *
- * One by one, output a line of text to all of our output destinations.
- *
- * Return failure if we fail to output to any of them.
- *
- * @param format Normal printf style vararg format
- *
- * @returns nothing// bytes written, or error on failure.
- */
-static void outputPrintf(char *format, ...)
-{
- va_list ap;
-
- va_start(ap, format);
-
- vsyslog(LOG_CRIT|LOG_NDELAY|LOG_MAIL, format, ap);
-} // outputPrintf
-
-
-
-/*!
- * Dump our backtrace into a global location
- *
- * This function will dump out our backtrace into our
- * global holding area.
- *
- */
-static void createGlobalBacktrace( void )
-{
-
- size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
- for (NThread = 0; NThread < size; NThread++)
- {
- syslog(LOG_CRIT|LOG_NDELAY|LOG_MAIL, "RAW: %p ", stack_frames[NThread]);
- }
- strings = backtrace_symbols(stack_frames, size);
- for (NThread = 0; NThread < size; NThread++) {
- if (strings != NULL) {
- syslog(LOG_CRIT|LOG_NDELAY|LOG_MAIL, "RAW: %p ", strings[NThread]);
- }
- }
-} /* createGlobalBacktrace */
-static void outputRawtrace( void )
-{
-
- size = backtrace(stack_frames, sizeof(stack_frames) / sizeof(void*));
- for (NThread = 0; NThread < size; NThread++)
- {
- syslog(LOG_CRIT|LOG_NDELAY|LOG_MAIL, "RAW: %p ", stack_frames[NThread]);
- }
-} /* createGlobalBacktrace */
-
-/*!
- * Print out (to all the fds, etc), or global backtrace
- */
-static void outputGlobalBacktrace ( void )
-{
- int i;
-
- for (i=0; i < gbl_backtraceEntries; i++) {
- if (gbl_backtraceSymbols != FALSE) {
- outputPrintf("* Frame %02x: %s\n",
- i, gbl_backtraceSymbols[i]);
- } else {
- outputPrintf("* Frame %02x: %p\n", i,
- gbl_backtraceBuffer[i]);
- }
- }
-} // outputGlobalBacktrace
-
-/*!
- * Output our current stack's backtrace
- */
-static void outputBacktrace( void )
-{
- createGlobalBacktrace();
- outputGlobalBacktrace();
-} /* outputBacktrace */
-
-static void outputBacktraceThreads( void )
-{
- ThreadListNode *probe;
- int i;
-
- // When we're backtracing, don't worry about the mutex . . hopefully
- // we're in a safe place.
-
- for (probe=ThreadList; probe; probe=probe->Next) {
- gbl_backtraceDoneFlag = 0;
- pthread_kill(probe->thread, probe->backtraceSignal);
- for (i=0; i < gbl_params.threadWaitTime; i++) {
- if (gbl_backtraceDoneFlag)
- break;
- sleep(1);
- }
- if (gbl_backtraceDoneFlag) {
- outputPrintf("* Backtrace of \"%s\" (0x%08x)\n",
- probe->threadName, (unsigned int)probe->thread);
- outputGlobalBacktrace();
- } else {
- outputPrintf("* Error: unable to get backtrace of \"%s\" (0x%08x)\n",
- probe->threadName, (unsigned int)probe->thread);
- }
- outputPrintf("*\n");
- }
-} // outputBacktraceThreads
-
-
-/*!
- * Handle signals (crash signals)
- *
- * This function will catch all crash signals, and will output the
- * crash dump.
- *
- * It will physically write (and sync) the current thread's information
- * before it attempts to send signals to other threads.
- *
- * @param signum Signal received.
- */
-static void crash_handler(int signo)
-{
- outputRawtrace();
- outputPrintf("*********************************************************\n");
- outputPrintf("* eCrash Crash Handler\n");
- outputPrintf("*********************************************************\n");
- outputPrintf("*\n");
- outputPrintf("* Got a crash! signo=%d\n", signo);
- outputPrintf("*\n");
- outputPrintf("* Offending Thread's Backtrace:\n");
- outputPrintf("*\n");
- outputBacktrace();
- outputPrintf("*\n");
-
- if (gbl_params.dumpAllThreads != FALSE) {
- outputBacktraceThreads();
- }
-
- outputPrintf("*\n");
- outputPrintf("*********************************************************\n");
- outputPrintf("* eCrash Crash Handler\n");
- outputPrintf("*********************************************************\n");
-
- exit(signo);
-} // crash_handler
-
-/*!
- * Handle signals (bt signals)
- *
- * This function shoudl be called to generate a crashdump into our
- * global area. Once the dump has been completed, this function will
- * return after tickling a global. Since mutexes are not async
- * signal safe, the main thread, after signaling us to generate our
- * own backtrace, will sleep for a few seconds waiting for us to complete.
- *
- * @param signum Signal received.
- */
-static void bt_handler(int signo)
-{
- createGlobalBacktrace();
- gbl_backtraceDoneFlag=1;
-} // bt_handler
-
-/*!
- * Validate a passed-in symbol table
- *
- * For now, just print it out (if verbose), and make sure it's
- * sorted and none of the pointers are zero.
- */
-static int ValidateSymbolTable( void )
-{
- int i;
- int rc=0;
- unsigned long lastAddress =0;
-
- // Get out of here if the table is empty
- if (!gbl_params.symbolTable) return 0;
-
- // Dump it in verbose mode
- DPRINTF(ECRASH_DEBUG_VERBOSE,
- "Symbol Table Provided with %d symbols\n",
- gbl_params.symbolTable->numSymbols);
- for (i=0; i < gbl_params.symbolTable->numSymbols; i++){
- // Dump it in verbose mode
- DPRINTF(ECRASH_DEBUG_VERBOSE,
- "%-30s %p\n",
- gbl_params.symbolTable->symbols[i].function,
- gbl_params.symbolTable->symbols[i].address);
- if (lastAddress >
- (unsigned long)gbl_params.symbolTable->symbols[i].address) {
- DPRINTF(ECRASH_DEBUG_ERROR,
- "Error: symbol table is not sorted (last=%p, current=%p)\n",
- (void *)lastAddress,
- gbl_params.symbolTable->symbols[i].address);
- rc = -1;
- }
-
- } // for
-
- return rc;
-
-} // ValidateSymbolTable
-
-/*********************************************************************
- *********************************************************************
- ** P U B L I C F U N C T I O N S
- *********************************************************************
- ********************************************************************/
-
-/*!
- * Initialize eCrash.
- *
- * This function must be called before calling any other eCrash
- * functions. It sets up the global behavior of the system, and
- * registers the calling thread for crash dumps.
- *
- * @param params Our input parameters. The passed in structure will be copied.
- *
- * @return Zero on success.
- */
-int eCrash_Init(eCrashParameters *params)
-{
- int sigIndex;
- int ret = 0;
-#ifdef DO_SIGNALS_RIGHT
- sigset_t blocked;
- struct sigaction act;
-#endif
-
- DPRINTF(ECRASH_DEBUG_VERY_VERBOSE,"Init Starting params = %p\n", params);
-
- if (params == NULL) return -1;
- // Allocate our backtrace area
- gbl_backtraceBuffer = malloc(sizeof(void *) * (params->maxStackDepth+5));
-
-#ifdef DO_SIGNALS_RIGHT
- sigemptyset(&blocked);
- act.sa_sigaction = crash_handler;
- act.sa_mask = blocked;
- act.sa_flags = SA_SIGINFO;
-#endif
-
- if (params != NULL) {
- // Make ourselves a global copy of params.
- gbl_params = *params;
- gbl_params.filename = strdup(params->filename);
-
- // Set our defaults, if they weren't specified
- if (gbl_params.maxStackDepth == 0 )
- gbl_params.maxStackDepth = ECRASH_DEFAULT_STACK_DEPTH;
-
- if (gbl_params.defaultBacktraceSignal == 0 )
- gbl_params.defaultBacktraceSignal = ECRASH_DEFAULT_BACKTRACE_SIGNAL;
-
- if (gbl_params.threadWaitTime == 0 )
- gbl_params.threadWaitTime = ECRASH_DEFAULT_THREAD_WAIT_TIME;
-
- if (gbl_params.debugLevel == 0 )
- gbl_params.debugLevel = ECRASH_DEBUG_DEFAULT;
-
- // Copy our symbol table
- if (gbl_params.symbolTable) {
- DPRINTF(ECRASH_DEBUG_VERBOSE,
- "symbolTable @ %p -- %d symbols\n", gbl_params.symbolTable,
- gbl_params.symbolTable->numSymbols);
- // Make a copy of our symbol table
- gbl_params.symbolTable = malloc(sizeof(eCrashSymbolTable));
- memcpy(gbl_params.symbolTable, params->symbolTable,
- sizeof(eCrashSymbolTable));
-
- // Now allocate / copy the actual table.
- gbl_params.symbolTable->symbols = malloc(sizeof(eCrashSymbol) *
- gbl_params.symbolTable->numSymbols);
- memcpy(gbl_params.symbolTable->symbols,
- params->symbolTable->symbols,
- sizeof(eCrashSymbol) * gbl_params.symbolTable->numSymbols);
-
- ValidateSymbolTable();
- }
-
- // And, finally, register for our signals
- for (sigIndex=0; gbl_params.signals[sigIndex] != 0; sigIndex++) {
- DPRINTF(ECRASH_DEBUG_VERY_VERBOSE,
- " Catching signal[%d] %d\n", sigIndex,
- gbl_params.signals[sigIndex]);
-
- // I know there's a better way to catch signals with pthreads.
- // I'll do it later TODO
- signal(gbl_params.signals[sigIndex], crash_handler);
- }
- } else {
- DPRINTF(ECRASH_DEBUG_ERROR, " Error: Null Params!\n");
- ret = -1;
- }
- DPRINTF(ECRASH_DEBUG_VERY_VERBOSE, "Init Complete ret=%d\n", ret);
- return ret;
-} /* eCrash_Init */
-
-/*!
- * UnInitialize eCrash.
- *
- * This function may be called to de-activate eCrash, release the
- * signal handlers, and free any memory allocated by eCrash.
- *
- * @return Zero on success.
- */
-int eCrash_Uninit( void )
-{
- NIY();
-
- return 0;
-} /* eCrash_Uninit */
-
-/*!
- * Register a thread for backtracing on crash.
- *
- * This function must be called by any thread wanting it's stack
- * dumped in the event of a crash. The thread my specify what
- * signal should be used, or the default, SIGUSR1 will be used.
- *
- * @param signo Signal to use to generate dump (default: SIGUSR1)
- *
- * @return Zero on success.
- */
-int eCrash_RegisterThread(char *name, int signo)
-{
- sighandler_t old_handler;
-
- // Register for our signal
- if (signo == 0) {
- signo = gbl_params.defaultBacktraceSignal;
- }
-
- old_handler = signal(signo, bt_handler);
- return addThreadToList(name, pthread_self(), signo, old_handler);
-
-} /* eCrash_RegisterThread */
-
-/*!
- * Un-register a thread for stack dumps.
- *
- * This function may be called to un-register any previously
- * registered thread.
- *
- * @return Zero on success.
- */
-int eCrash_UnregisterThread( void )
-{
- return removeThreadFromList(pthread_self());
-} /* eCrash_UnregisterThread */
-
-#endif
projects / citadel.git / blobdiff