bool add_conn(struct io_conn *c);
bool add_duplex(struct io_conn *c);
void del_listener(struct io_listener *l);
+void cleanup_conn_without_close(struct io_conn *c);
void backend_new_always(struct io_conn *conn);
void backend_new_plan(struct io_conn *conn);
void remove_from_always(struct io_conn *conn);