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error handling

I have this problem of needing to take some action when an error occurs,
regardless of why. I am in a situation where I have acquired the display,
and then I am running user-supplied code. If an error occurrs, I have
to release the display immmediately -- before even writing an error
message -- or the system will get highly screwed up. Is there any
way - released or unreleased - to get control immediately upon an error?