Hallvard B Furuseth <h.b.furus...@usit.uio.no> added the comment:

Amaury Forgeot d'Arc writes:
> OTOH this is really a micro optimization.

["this" = only saving/restoring errno when needed]
True, but practically nothing is officially safe to do in signal
handlers, so it's good to avoid code which can be avoided there.
If one can be bothered to, that is.

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