> so how do you unregister an event after you close the file ... You have no way to do that, you just keep getting events for a resource you no longer have open ... It's incredible that you can set things up in a way that you get events on a resource you can no longer refer to in any way.

Yes, I thought that too, it does not make much sense to me either. (I would suppose that you could close the epoll file descriptor, but then that would cancel all events, and not only that one.)