+ switch (conn->plan.io(conn->fd.fd, &conn->plan)) {
+ case -1: /* Failure means a new plan: close up. */
+ set_current(conn);
+ conn->plan = io_close();
+ backend_plan_changed(conn);
+ set_current(NULL);
+ break;
+ case 0: /* Keep going with plan. */
+ break;
+ case 1: /* Done: get next plan. */