fifos come to mind as the other things which are a bit like pipes/sockets.
>
>         2) epoll must be used on non-blocking sockets only
>               (and describe the race that happens otherwise)
That much is implied simply by epoll being a queue of not_ready->ready
edge transitions.  It would be good for the manual to explain this,
but it is clearly implied by the API if you think about it.
-- Jamie
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