async fn hangup(socket: &UnixSeqpacket)Expand description
Wait until the client closed the connection. Without output, a send never notices, and a client which only closed its write side still receives the output. The hangup gets reported by an epoll instance of its own, which watches the socket for nothing but the hangups and errors epoll always reports. Neither input nor output wakes it up, and its readiness is separate from the one of the socket, which the read and write loops use. If that fails, only a failing send ends the loop.