epoll(7) redux

[Sam Varshavchik <mrsam@xxxxxxxxxxxxxxx>]

Q2

   Can two epoll sets wait for the same file descriptor? If so, are events 
reported to both epoll file descriptors?

A2

   Yes, and events would be reported to both. However, it is not 
recommended.

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It's not clear what "not recommended" means. Furthermore, I don't think 
there's anything wrong with two epoll file descriptors waiting for different 
events on the same file descriptor. One's waiting for POLLIN, the other for 
POLLOUT. What's wrong with that?

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