TIL FIPS actually accomplished _something_ very good.pic.twitter.com/IJDMAzFrMA
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Note the shall-fail text is different from other functions where it only applies if the signal was interrupting.
That's a little more reading between the spec's lines than I like, but ok, point taken. Still, for select, you need a loop on EINTR. 
Welcome to reading standards. Stuff gets written this way to hide subtle requirements from committee members who would object/bikeshed it.
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