Message6484

A patch that wraps all sun.misc.Signal methods that may raise IllegalArgumentException with try/except that reraises them as ValueErrors is attached. As a result also signal.getsignal and signal.alarm may raise ValueError which they aren't documented to do, but that's probably better than raising equally undocumented Java based IAE.

I would have liked to create unit tests for these fixes but couldn't figure any easy way to do that. Probably tests could temporarily replace sun.misch.Signal.handle with a method that always raises an IAE but I'm not sure is that worth the effort.