Function drive_attach_stream 

pub fn drive_attach_stream<Input, Output>(
    stream: UnixStream,
    input: Input,
    output: Output,
    resize_events: Receiver<TerminalSize>,
) -> Result<(), ClientError>
where
    Input: Read + AsFd + Send + 'static,
    Output: Write + Send + 'static,

Drives raw attach-stream byte forwarding over an upgraded Unix socket.