static int s_fatal_signals[] = {
    SIGABRT,
    SIGBUS,
    SIGFPE,
    SIGILL,
    SIGSEGV,
    SIGTRAP,
    SIGTERM,
    SIGKILL,
};


static int s_fatal_signal_num = sizeof(s_fatal_signals) / sizeof(s_fatal_signals[0]);

void UncaughtExceptionHandler(NSException *exception) {
    NSArray *arr = [exception callStackSymbols];//得到当前调用栈信息
    NSString *reason = [exception reason];//非常重要，就是崩溃的原因
    NSString *name = [exception name];//异常类型
}

void SignalHandler(int code)
{
    NSLog(@"signal handler = %d",code);
}

void InitCrashReport()
{
    // 1 linux错误信号捕获
    for (int i = 0; i < s_fatal_signal_num; ++i) {
        signal(s_fatal_signals[i], SignalHandler);
    }
    
    // 2 objective-c未捕获异常的捕获
    NSSetUncaughtExceptionHandler(&UncaughtExceptionHandler);
}
int main(int argc, char * argv[]) {
    @autoreleasepool {
        InitCrashReport();

        return UIApplicationMain(argc, argv, nil, NSStringFromClass([AppDelegate class]));
    }
}

//
 // Called to handle a pending crash report.
 //
- (void) handleCrashReport {
     PLCrashReporter *crashReporter = [PLCrashReporter sharedReporter];
     NSData *crashData;
     NSError *error;

     // Try loading the crash report
     crashData = [crashReporter loadPendingCrashReportDataAndReturnError: &error];
     if (crashData == nil) {
         NSLog(@"Could not load crash report: %@", error);
         [crashReporter purgePendingCrashReport];
         return;
     }
    
    [crashData writeToFile:[self crashDataPath] atomically:YES];

     // We could send the report from here, but we'll just print out
     // some debugging info instead
     PLCrashReport *report = [[PLCrashReport alloc] initWithData: crashData error: &error];
     if (report == nil) {
         NSLog(@"Could not parse crash report");
         [crashReporter purgePendingCrashReport];
         return;
     }

     NSLog(@"Crashed on %@", report.systemInfo.timestamp);
     NSLog(@"Crashed with signal %@ (code %@, address=0x%" PRIx64 ")", report.signalInfo.name,
           report.signalInfo.code, report.signalInfo.address);
    
    NSString *humanText = [PLCrashReportTextFormatter stringValueForCrashReport:report withTextFormat:PLCrashReportTextFormatiOS];
    
    [self WriteContent:humanText];
    
     // Purge the report
     [crashReporter purgePendingCrashReport];
    
     return;
 }

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary *)launchOptions {
    // Override point for customization after application launch.
    
    PLCrashReporter *crashReporter = [PLCrashReporter sharedReporter];
    NSError *error;
    
    // Check if we previously crashed
    if ([crashReporter hasPendingCrashReport])
        [self handleCrashReport];

    // Enable the Crash Reporter
    if (![crashReporter enableCrashReporterAndReturnError: &error])
        NSLog(@"Warning: Could not enable crash reporter: %@", error);
    
    return YES;
}