xs_queue_reply
xs_queue_reply(u, (char *)&msg, sizeof(msg));
xs_queue_reply(u, payload, msg.len);
xs_queue_reply(dwatch->user, (char *)&msg, sizeof(msg));
xs_queue_reply(dwatch->user, payload, msg.len);
xs_queue_reply(u, (char *)&u->u.msg, sizeof(u->u.msg));
xs_queue_reply(u, (char *)reply, u->u.msg.len);
xs_queue_reply(u, (char *)&u->u.msg, sizeof(u->u.msg));
xs_queue_reply(u, ok, sizeof(ok));
xs_queue_reply(u, (char *)&u->u.msg, sizeof(u->u.msg));
xs_queue_reply(u, ok, sizeof(ok));