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Looks like my assertion that timeout==1 is wrong :-).
Otherwise, the analysis is correct: recv is called when
select() retuned EINTR.

I think your approach is the way to go. Since the return
value of internal_select is no longer a boolean for a
timeout, maybe in the expressions "timeout =
internal_select(...)", "timeout" should be renamed to
something more generic (possibly 'selectresult')?