what does “exited abnormally with signal 9: Killed: 9” mean

How to read error codes which appear in the console? 

:  ....... -exited abnormally with signal 9: Killed: 9
:  ....... -1 err = Bad file descriptor (0x00000009)

Here what does signal 9 mean, are there any more signals apart from it. Any documentation available for it.

I get this kind of error, when a App. launched from Xcode is terminated by "Stop" button in Xcode toolbar.

{Another way to get this error is , to press home button, then double tap home button and close the app. }

Things even get worse when I launch the App. again, by tapping on App. icon on iPad Screen, App crashes and throws "libMobileGestalt copySystemVersionDictionaryValue: Could not lookup ReleaseType from system version dictionary"

From finding on stack overflow , I see that this error is found in iOS 6 devices.

This url states that it's a SIGKILL error and it happens when "application is being terminated immediately, without any chance to clean up or catch and handle the signal"

So, I think releasing objets in "-(void) didReceiveMemoryWarning" would not help to solve it, then what could be a definite solution?

-(void) didReceiveMemoryWarning{
    [super didReceiveMemoryWarning];
    //release objects
    obj1=nil;
    [view1 removeFromSuperView];
    view1=nil;
    ........
}

1 down vote

It means that the application received a signal. Some signal could be handled by the applications, others, not. Signal 9 means that the application needs to be killed, it is not handled by the process, but by the Linux scheduler. The signal to terminate the process that is handled by the process is SIGTERM(15), but, if the process doesn't handle it property, then the process continues to live. here are the major signals: Signal Value Action Comment ────────────────────────────────────────────────────────────────────── SIGHUP 1 Term Hangup detected on controlling terminal or death of controlling process SIGINT 2 Term Interrupt from keyboard SIGQUIT 3 Core Quit from keyboard SIGILL 4 Core Illegal Instruction SIGABRT 6 Core Abort signal from abort(3) SIGFPE 8 Core Floating point exception SIGKILL 9 Term Kill signal SIGSEGV 11 Core Invalid memory reference SIGPIPE 13 Term Broken pipe: write to pipe with no readers SIGALRM 14 Term Timer signal from alarm(2) SIGTERM 15 Term Termination signal SIGUSR1 30,10,16 Term User-defined signal 1 SIGUSR2 31,12,17 Term User-defined signal 2 SIGCHLD 20,17,18 Ign Child stopped or terminated SIGCONT 19,18,25 Cont Continue if stopped SIGSTOP 17,19,23 Stop Stop process SIGTSTP 18,20,24 Stop Stop typed at terminal SIGTTIN 21,21,26 Stop Terminal input for background process SIGTTOU 22,22,27 Stop Terminal output for background process

1 down vote

It means that the application received a signal. Some signal could be handled by the applications, others, not. Signal 9 means that the application needs to be killed, it is not handled by the process, but by the Linux scheduler. The signal to terminate the process that is handled by the process is SIGTERM(15), but, if the process doesn't handle it property, then the process continues to live. here are the major signals: Signal Value Action Comment ────────────────────────────────────────────────────────────────────── SIGHUP 1 Term Hangup detected on controlling terminal or death of controlling process SIGINT 2 Term Interrupt from keyboard SIGQUIT 3 Core Quit from keyboard SIGILL 4 Core Illegal Instruction SIGABRT 6 Core Abort signal from abort(3) SIGFPE 8 Core Floating point exception SIGKILL 9 Term Kill signal SIGSEGV 11 Core Invalid memory reference SIGPIPE 13 Term Broken pipe: write to pipe with no readers SIGALRM 14 Term Timer signal from alarm(2) SIGTERM 15 Term Termination signal SIGUSR1 30,10,16 Term User-defined signal 1 SIGUSR2 31,12,17 Term User-defined signal 2 SIGCHLD 20,17,18 Ign Child stopped or terminated SIGCONT 19,18,25 Cont Continue if stopped SIGSTOP 17,19,23 Stop Stop process SIGTSTP 18,20,24 Stop Stop typed at terminal SIGTTIN 21,21,26 Stop Terminal input for background process SIGTTOU 22,22,27 Stop Terminal output for background process