Function encode_userdata

examples/proxy.c:677–681

* See __encode_userdata() for how we encode sqe->user_data, which is passed * back as cqe->user_data at completion time. */

 * back as cqe->user_data at completion time.
 */
static void encode_userdata(struct io_uring_sqe *sqe, struct conn *c, int op,
			    int bid, int fd)
{
	__encode_userdata(sqe, c->tid, op, bid, fd);
}

static void __submit_receive(struct io_uring *ring, struct conn *c,
			     struct conn_dir *cd, int fd)