[issue10311] Signal handlers must preserve errno

[Hallvard B Furuseth]

Hallvard B Furuseth <h.b.furuseth at usit.uio.no> added the comment:

Parser/intrcheck.c:intcatcher() should do the same.  Covered in Issue
10312.

Antoine Pitrou writes:
> This is a good idea IMO. It would be better if you minimized style
> changes, so that the patch is easier to review.

I'm afraid the un-rearranged code would be fairly ugly, so I cleaned
up first.  Single exit point.

> Also, is the while loop around write() necessary here?

Whoops, I'd forgotten I did that too, it was on my TODO list to
check if Python makes it unnecessary by making write restartable.
I don't remember if that's possible to ensure on all modern Posixes

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