Add new epoll methods "modify_*sock"
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lilyco
It would be great to have epoll methods to modify the events that should be listened for.
Currently you have to call "epoll_remove_usock" and "epoll_add_usock" to switch from UDT_EPOLL_IN | UDT_EPOLL_OUT to UDT_EPOLL_IN only. Same for the system sockets where you could use EPOLL_CTL_MOD internally.