idmap_reg_dh
int idmap_reg_dh(zone_t *zone, door_handle_t dh);
int idmap_reg_dh(zone_t *zone, door_handle_t dh);
int idmap_reg_dh(zone_t *zone, door_handle_t dh);
if ((err = idmap_reg_dh(crgetzone(cr), dh)) != 0)