Monitor start and close of process?

Is there a way to monitor processes in the Mac OS X before they Start & End?

I have a dynamic which I would like to inject in few selected processes before the start, so that hooking can be performed. And would开发者_StackOverflow社区 like to do the reverse when application quits, i.e. when application quits I want to unload that library from those process & thus perform unhooking.

What can be the best solution for my situation?

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In Carbon, you can register for the kEventClassApplication/kEventAppLaunched event. For quitting, I think looking for an event might not be the best approach; you may not be able to respond in time before the process actually ends. It may be better to have your injected code install an atexit handler or something.

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When application quits it unload's that library from those process automatically. I had a bug which prevented calling of destructor from dylib.