Constant epoll::EPOLLHUP

pub const EPOLLHUP: Events = Events{bits: libc::EPOLLHUP as u32,}

Hang up happened on the associated file descriptor.

wait will always wait for this event; it is not necessary to set it in events. Note that when reading from a channel such as a pipe or a stream socket, this event merely indicates that the peer closed its end of the channel. Subsequent reads from the channel will return 0 (end of file) only after all outstanding data in the channel has been consumed.