InitializerDispatch
init(type:fileDescriptor:queue:cleanupHandler:)
convenience init(type: DispatchIO.StreamType, fileDescriptor: dispatch_fd_t, queue: DispatchQueue, cleanupHandler: @escaping (Int32) -> Void)InitializerDispatch
convenience init(type: DispatchIO.StreamType, fileDescriptor: dispatch_fd_t, queue: DispatchQueue, cleanupHandler: @escaping (Int32) -> Void)