Epoll is fundamentally broken 2/2
https://idea.popcount.org/2017-03-20-epoll-is-fundamentally-broken-22/ [idea.popcount.org]
2017-03-20 16:44
To make matters worse, you need a valid file descriptor handle to manage subscriptions on “epfd”. After we called close(rfd), there is no way to unregister it from epfd!
source: L