[issue10311] Signal handlers must preserve errno

[Hallvard B Furuseth]

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

Antoine Pitrou writes:
> I think it is extremely unlikely that mutating errno in a signal handler
> is unsafe (after all, the library functions called from that handler can
> mutate errno too: that's the whole point of the patch IIUC). Adding some
> configure machinery for this seems unwarranted to me.

Fine by me.

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