[issue18869] test suite: faulthandler signal handler is lost

[Charles-François Natali]

Charles-François Natali added the comment:

> Or perhaps we could enhance the signal module so that getsignal() return something (i.e. a specific object) which can restore the C signal handler. That would be better than special-casing faulthandler, IMHO.

Yes, I thought about that, see http://bugs.python.org/msg146560
The only problem I saw at that time is that we must make sure that the
object is indeed valid, otherwise the signal handler can jump to an
invalid address, and boom.

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