From 14e4f0497d02f47d9c31e5750a1c776366c729d6 Mon Sep 17 00:00:00 2001
From: Anthony Minessale <anthony.minessale@gmail.com>
Date: Fri, 18 Sep 2009 15:55:10 +0000
Subject: [PATCH] farewell crash protection

git-svn-id: http://svn.freeswitch.org/svn/freeswitch/trunk@14919 d0543943-73ff-0310-b7d9-9358b9ac24b2
---
 conf/autoload_configs/switch.conf.xml |   2 -
 src/include/switch_types.h            |   9 ++-
 src/switch_core.c                     |   9 +--
 src/switch_core_state_machine.c       | 100 +-------------------------
 4 files changed, 8 insertions(+), 112 deletions(-)

diff --git a/conf/autoload_configs/switch.conf.xml b/conf/autoload_configs/switch.conf.xml
index 21cca06cba..a4fe7a5708 100644
--- a/conf/autoload_configs/switch.conf.xml
+++ b/conf/autoload_configs/switch.conf.xml
@@ -24,8 +24,6 @@
     <param name="sessions-per-second" value="30"/>
     <!-- Default Global Log Level - value is one of debug,info,notice,warning,err,crit,alert -->
     <param name="loglevel" value="debug"/>
-    <!--Try to catch any crashes that can be recoverable (in the context of a call)-->
-    <param name="crash-protection" value="false"/>
 	<!-- The min_dtmf_duration specifies the minimum DTMF duration to use on 
 	     outgoing events. Events shorter than this will be increased in duration
 		 to match min_dtmf_duration. You cannot configure a dtmf duration on a 
diff --git a/src/include/switch_types.h b/src/include/switch_types.h
index 6818f67aa7..58b0b5d462 100644
--- a/src/include/switch_types.h
+++ b/src/include/switch_types.h
@@ -231,11 +231,10 @@ typedef enum {
 	SCF_USE_SQL = (1 << 0),
 	SCF_NO_NEW_SESSIONS = (1 << 1),
 	SCF_SHUTTING_DOWN = (1 << 2),
-	SCF_CRASH_PROT = (1 << 3),
-	SCF_VG = (1 << 4),
-	SCF_RESTART = (1 << 5),
-	SCF_SHUTDOWN_REQUESTED = (1 << 6),
-	SCF_USE_AUTO_NAT = (1 << 7)
+	SCF_VG = (1 << 3),
+	SCF_RESTART = (1 << 4),
+	SCF_SHUTDOWN_REQUESTED = (1 << 5),
+	SCF_USE_AUTO_NAT = (1 << 6)
 } switch_core_flag_enum_t;
 typedef uint32_t switch_core_flag_t;
 
diff --git a/src/switch_core.c b/src/switch_core.c
index 72c9259439..800bf2375b 100644
--- a/src/switch_core.c
+++ b/src/switch_core.c
@@ -1379,11 +1379,7 @@ static void switch_load_core_config(const char *file)
 				const char *var = switch_xml_attr_soft(param, "name");
 				const char *val = switch_xml_attr_soft(param, "value");
 
-				if (!strcasecmp(var, "crash-protection")) {
-					if (switch_true(val)) {
-						switch_set_flag((&runtime), SCF_CRASH_PROT);
-					}
-				} else if (!strcasecmp(var, "loglevel")) {
+				if (!strcasecmp(var, "loglevel")) {
 					int level;
 					if (*val > 47 && *val < 58) {
 						level = atoi(val);
@@ -1507,8 +1503,7 @@ SWITCH_DECLARE(switch_status_t) switch_core_init_and_modload(switch_core_flag_t
 	}
 
 	switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CONSOLE,
-					  "\nFreeSWITCH Version %s Started.\nCrash Protection [%s]\nMax Sessions[%u]\nSession Rate[%d]\nSQL [%s]\n", SWITCH_VERSION_FULL,
-					  switch_test_flag((&runtime), SCF_CRASH_PROT) ? "Enabled" : "Disabled",
+					  "\nFreeSWITCH Version %s Started.\nMax Sessions[%u]\nSession Rate[%d]\nSQL [%s]\n", SWITCH_VERSION_FULL,
 					  switch_core_session_limit(0),
 					  switch_core_sessions_per_second(0), switch_test_flag((&runtime), SCF_USE_SQL) ? "Enabled" : "Disabled");
 
diff --git a/src/switch_core_state_machine.c b/src/switch_core_state_machine.c
index 00ba89e308..6cca5ea7ea 100644
--- a/src/switch_core_state_machine.c
+++ b/src/switch_core_state_machine.c
@@ -212,75 +212,9 @@ static void switch_core_standard_on_hibernate(switch_core_session_t *session)
 	switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_DEBUG, "%s Standard HIBERNATE\n", switch_channel_get_name(session->channel));
 }
 
-#include <sqlite3.h>
-#include "../../../libs/sqlite/src/hash.h"
-
-//static switch_hash_t *stack_table = NULL;
-static Hash stack_table;
-static switch_mutex_t *stack_mutex = NULL;
-
-#if defined (__GNUC__) && defined (LINUX) && defined (HAVE_EXECINFO_H)
-#include <execinfo.h>
-#include <stdio.h>
-#include <stdlib.h>
-#define STACK_LEN 10
-
-/* Obtain a backtrace and print it to stdout. */
-static void print_trace(void)
-{
-	void *array[STACK_LEN];
-	size_t size;
-	char **strings;
-	size_t i;
-
-	size = backtrace(array, STACK_LEN);
-	strings = backtrace_symbols(array, size);
-
-	switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CRIT, "Obtained %zd stack frames.\n", size);
-
-	for (i = 0; i < size; i++) {
-		switch_log_printf(SWITCH_CHANNEL_LOG_CLEAN, SWITCH_LOG_CRIT, "%s\n", strings[i]);
-	}
-
-	free(strings);
-}
-#else
-static void print_trace(void)
-{
-	switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CRIT, "Trace not available =(\n");
-}
-#endif
-
-static void handle_fatality(int sig)
-{
-	switch_thread_id_t thread_id;
-	jmp_buf *env;
-
-	if (!sig) return;
-
-	thread_id = switch_thread_self();
-	switch_mutex_lock(stack_mutex);
-	env = (jmp_buf *) sqlite3HashFind(&stack_table, &thread_id, sizeof(thread_id));
-	switch_mutex_unlock(stack_mutex);
-
-	if (thread_id && env) {
-		print_trace();
-		longjmp(*env, sig);
-	} else {
-		switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_CRIT, "Caught signal %d for unmapped thread!", sig);
-		abort();
-	}
-}
-
 void switch_core_state_machine_init(switch_memory_pool_t *pool)
 {
-
-	if (switch_test_flag((&runtime), SCF_CRASH_PROT)) {
-		switch_mutex_init(&stack_mutex, SWITCH_MUTEX_NESTED, pool);
-		switch_mutex_lock(stack_mutex);
-		sqlite3HashInit(&stack_table, SQLITE_HASH_BINARY, 0);
-		switch_mutex_unlock(stack_mutex);
-	}
+	return;
 }
 
 #define STATE_MACRO(__STATE, __STATE_STR)						do {	\
@@ -329,35 +263,9 @@ SWITCH_DECLARE(void) switch_core_session_run(switch_core_session_t *session)
 	const switch_endpoint_interface_t *endpoint_interface;
 	const switch_state_handler_table_t *driver_state_handler = NULL;
 	const switch_state_handler_table_t *application_state_handler = NULL;
-	switch_thread_id_t thread_id;
-	jmp_buf env;
-	int sig, silly = 0;
+	int silly = 0;
 	uint32_t new_loops = 60000;
 
-	if (switch_test_flag((&runtime), SCF_CRASH_PROT)) {
-		thread_id = switch_thread_self();
-		signal(SIGSEGV, handle_fatality);
-		signal(SIGFPE, handle_fatality);
-#ifndef WIN32
-		signal(SIGBUS, handle_fatality);
-#endif
-
-		if ((sig = setjmp(env)) != 0) {
-			switch_event_t *event;
-
-			if (switch_event_create(&event, SWITCH_EVENT_SESSION_CRASH) == SWITCH_STATUS_SUCCESS) {
-				switch_channel_event_set_data(session->channel, event);
-				switch_event_fire(&event);
-			}
-			switch_log_printf(SWITCH_CHANNEL_SESSION_LOG(session), SWITCH_LOG_CRIT, "Thread has crashed for channel %s\n", switch_channel_get_name(session->channel));
-			switch_channel_hangup(session->channel, SWITCH_CAUSE_CRASH);
-		} else {
-			switch_mutex_lock(stack_mutex);
-			sqlite3HashInsert(&stack_table, &thread_id, sizeof(thread_id), (void *) &env);
-			switch_mutex_unlock(stack_mutex);
-		}
-	}
-
 	/*
 	   Life of the channel. you have channel and pool in your session
 	   everywhere you go you use the session to malloc with
@@ -474,10 +382,6 @@ SWITCH_DECLARE(void) switch_core_session_run(switch_core_session_t *session)
   done:
 	switch_mutex_unlock(session->mutex);
 
-	if (switch_test_flag((&runtime), SCF_CRASH_PROT)) {
-		sqlite3HashInsert(&stack_table, &thread_id, sizeof(thread_id), NULL);
-		//apr_hash_set(stack_table, &thread_id, sizeof(thread_id), NULL);
-	}
 	session->thread_running = 0;
 }