Martin Panter added the comment:

I would expect it to hang (until the timeout expired) of no files are added. If 
it returns an empty list, that should mean the timeout expired.

I guess Mac uses KqueueSelector. I would certainly expect SelectSelector to 
hang. Maybe the underlying kqueue implementation behaves differently though. 
Perhaps Python should handle this as a special case in the selectors module?

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nosy: +martin.panter

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<http://bugs.python.org/issue25680>
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