Created attachment 54012 [details]
test case

The epoll(7) manpage states the following:

        Q3  Is the epoll file descriptor itself poll/epoll/selectable?

       A3  Yes.  If an epoll file descriptor has events waiting then  it  will
           indicate as being readable.

It appears that this functionality is broken. I have attached a testcase that uses select() to test an epoll descriptor for readability. The return value of select() is zero, even though the epoll descriptor has events waiting.