[macios-devel] Signal-chaining & crash reporters

Miguel de Icaza miguel at microsoft.com
Fri Sep 16 17:22:01 UTC 2016


Thanks for getting these proposals out Rolf.

I am not a fan of any of the provided options.

We have two issues here: Mono is doing the right thing by supporting “chained handlers”, but many of these libraries can not chain signal handlers.

Let me propose that we add a pair of methods, to undo the signal handling setup, and to restore the handling setup and surface those to managed code.

The code for things like HockeyApp would become:

	Mono.UndoSignalHandlingSetup ();		// SIGSEGV points back to original handlers
	HockeyAppInstallHandlers ();			// SIGSEGV now points to HockeyApp handlers
	Mono.InstallSignalHandlers ();			// SIGSEGV now points to Mono handler, that have chained capabilities

The Undo/Install is necessary for the rare case of a library that can do proper chaining and might want to chain to another handler, so they would not chain back to Mono.


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