call shutdown() before close()

src/core.c

@@ -41,6 +41,7 @@ static void tip_client_release(struct ev_loop *loop, struct tip_client *cli)
 
 	list_del(&cli->list);
 	ev_io_stop(loop, &cli->io);
+	shutdown(cli->io.fd, SHUT_RDWR);
 	close(cli->io.fd);
 	if (cli->fd > 0)
 		close(cli->fd);