[android-developers] Re: Dispatching to original signal handler sometimes does not print the crash details to logcat

Removing the exit at the end of my custom handler fixed the problem.
So the conditions for getting the native crash details printed seem to
be to call the original handler and to let the custom handler return
instead of exiting the process.

On Sep 16, 1:52 pm, Shri <shri.bo...@gmail.com> wrote:
> My app uses native code, and I install my custom signal handler to
> handle crashes. When it is called, it launches a separate crash-
> reporting process (the activity specifies android:process for process
> isolation) which will report the crash details in logcat after waiting
> for a bit (to ensure the crash details get written). My custom signal
> handler then dispatches to the original signal handler which usually
> writes thenativecrash details to logcat. However, sometimes the
> default signal handler does not write the crash details and instead
> just seems to return. I know it was called and that it returns because
> I have a log message in my custom crash handler before and after the
> call to the default crash handler.
>
> If I reset the handler to the original handler, and trigger another
> crash from my custom handler, the crash details do get written to
> logcat, but it does not have the stack of the original crash, and so
> its not of much value. However, it confirms that the value of
> original_handler does point to the original handler.
>
> Any idea why the call to the default crash handler may not write the
> crash details to logcat? Could it be that the bit which indicates that
> the process has crashed gets reset sometimes?
>
> This is the pseudo-code:
>
> signalhandler original_handler;
>
> void my_custom_handler(int sig) {
>
> launch_separate_process_to_report_logcat_after_waiting_for_one_second();
>   LOG("Calling original handler");
>
>   // This normally writes crash details to logcat and then terminates
> the app
>   // Sometimes it does not write the crash details to logcat and just
> returns
>   original_handler(sig);
>
>   LOG("Called original handler");
>
> }
>
> void setup_crash_handling() {
>   original_handler = signal(my_custom_handler, SIGSEGV);
>
> }

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