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Added refinement for ZMQ_FD option
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@ -355,6 +355,12 @@ necessarily indicate that messages are available to be read from, or can be
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written to, the underlying socket; applications must retrieve the actual event
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state with a subsequent retrieval of the 'ZMQ_EVENTS' option.
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NOTE: The returned file descriptor is also used internally by 'zmq_send' and
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'zmq_recv' functions. Given it's edge triggered nature, application must update
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state of 'ZMQ_EVENTS' after each invocation of 'zmq_send' or 'zmq_recv'.
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To be more explicit: after calling 'zmq_send' socket may become readable (and
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vice versa) without triggering read event on file descriptor.
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CAUTION: The returned file descriptor is intended for use with a 'poll' or
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similar system call only. Applications must never attempt to read or write data
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to it directly, neither should they try to close it.
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