// // UncaughtExceptionHandler.m // UncaughtExceptions // // Created by Matt Gallagher on 2010/05/25. // Copyright 2010 Matt Gallagher. All rights reserved. // // Permission is given to use this source code file, free of charge, in any // project, commercial or otherwise, entirely at your risk, with the condition // that any redistribution (in part or whole) of source code must retain // this copyright and permission notice. Attribution in compiled projects is // appreciated but not required. // #import "UncaughtExceptionHandler.h" #include #include NSString * const UncaughtExceptionHandlerSignalExceptionName = @"UncaughtExceptionHandlerSignalExceptionName"; NSString * const UncaughtExceptionHandlerSignalKey = @"UncaughtExceptionHandlerSignalKey"; NSString * const UncaughtExceptionHandlerAddressesKey = @"UncaughtExceptionHandlerAddressesKey"; volatile int32_t UncaughtExceptionCount = 0; const int32_t UncaughtExceptionMaximum = 10; const NSInteger UncaughtExceptionHandlerSkipAddressCount = 4; const NSInteger UncaughtExceptionHandlerReportAddressCount = 5; @implementation UncaughtExceptionHandler + (NSArray *)backtrace { void* callstack[128]; int frames = backtrace(callstack, 128); char **strs = backtrace_symbols(callstack, frames); int i; NSMutableArray *backtrace = [NSMutableArray arrayWithCapacity:frames]; for ( i = UncaughtExceptionHandlerSkipAddressCount; i < UncaughtExceptionHandlerSkipAddressCount + UncaughtExceptionHandlerReportAddressCount; i++) { [backtrace addObject:[NSString stringWithUTF8String:strs[i]]]; } free(strs); return backtrace; } - (void)alertView:(UIAlertView *)anAlertView clickedButtonAtIndex:(NSInteger)anIndex { if (anIndex == 0) { dismissed = YES; } } - (void)validateAndSaveCriticalApplicationData { } - (void)handleException:(NSException *)exception { [self validateAndSaveCriticalApplicationData]; id delegate = [[UIApplication sharedApplication] delegate]; if([delegate respondsToSelector:@selector(terminateWithException:)]) { dismissed = (BOOL)[delegate performSelector:@selector(terminateWithException:) withObject:exception]; } NSSetUncaughtExceptionHandler(NULL); signal(SIGABRT, SIG_DFL); signal(SIGILL, SIG_DFL); signal(SIGSEGV, SIG_DFL); signal(SIGFPE, SIG_DFL); signal(SIGBUS, SIG_DFL); signal(SIGPIPE, SIG_DFL); if ([[exception name] isEqual:UncaughtExceptionHandlerSignalExceptionName]) { kill(getpid(), [[[exception userInfo] objectForKey:UncaughtExceptionHandlerSignalKey] intValue]); } else { [exception raise]; } } @end void HandleException(NSException *exception) { int32_t exceptionCount = OSAtomicIncrement32(&UncaughtExceptionCount); if (exceptionCount > UncaughtExceptionMaximum) { return; } NSArray *callStack = [UncaughtExceptionHandler backtrace]; NSMutableDictionary *userInfo = [NSMutableDictionary dictionaryWithDictionary:[exception userInfo]]; [userInfo setObject:callStack forKey:UncaughtExceptionHandlerAddressesKey]; [[[UncaughtExceptionHandler alloc] init] performSelectorOnMainThread:@selector(handleException:) withObject: [NSException exceptionWithName:[exception name] reason:[exception reason] userInfo:userInfo] waitUntilDone:YES]; } void SignalHandler(int signal) { int32_t exceptionCount = OSAtomicIncrement32(&UncaughtExceptionCount); if (exceptionCount > UncaughtExceptionMaximum) { return; } NSMutableDictionary *userInfo = [NSMutableDictionary dictionaryWithObject:[NSNumber numberWithInt:signal] forKey:UncaughtExceptionHandlerSignalKey]; NSArray *callStack = [UncaughtExceptionHandler backtrace]; [userInfo setObject:callStack forKey:UncaughtExceptionHandlerAddressesKey]; [[[UncaughtExceptionHandler alloc] init] performSelectorOnMainThread:@selector(handleException:) withObject: [NSException exceptionWithName:UncaughtExceptionHandlerSignalExceptionName reason: [NSString stringWithFormat: NSLocalizedString(@"Signal %d was raised.", nil), signal] userInfo: [NSDictionary dictionaryWithObject:[NSNumber numberWithInt:signal] forKey:UncaughtExceptionHandlerSignalKey]] waitUntilDone:YES]; } void InstallUncaughtExceptionHandler(void) { NSSetUncaughtExceptionHandler(&HandleException); signal(SIGABRT, SignalHandler); signal(SIGILL, SignalHandler); signal(SIGSEGV, SignalHandler); signal(SIGFPE, SignalHandler); signal(SIGBUS, SignalHandler); signal(SIGPIPE, SignalHandler); }