[issue10311] Signal handlers must preserve errno

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

> Nice.  Then I suggest a config macro for whether this is needed.
> Either a test for windows, or an autoconf thing in case some Unixes
> are equally sensible.  (Linux isn't, I checked.)

I'm quite sure that all Unixes invoke signal handlers in some existing thread. So even if errno is thread-local, it needs to be saved and restored.
OTOH this is really a micro optimization.

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