On 22/01/2015 22:12, Andy Lutomirski wrote:

In my application, the set of fds almost never changes, but the set of
events I want changes all the time.  The main thing that changes is
whether I care about EPOLLOUT.  If I'm ready to send something, then I
want EPOLLOUT.  If I'm not ready, then I don't want EPOLLOUT.

Yes, this is almost always the case unless you use EPOLLET.

Paolo