156 struct xfrd_zone {  struct
177 	enum xfrd_zone_state {  argument
203 	xfrd_zone_type* tcp_waiting_next;  argument
204 	xfrd_zone_type* tcp_waiting_prev;  argument
208 	xfrd_zone_type* tcp_send_next;  argument
209 	xfrd_zone_type* tcp_send_prev;  argument
213 	xfrd_zone_type* udp_waiting_next;  argument
214 	xfrd_zone_type* udp_waiting_prev;  argument
218 	xfrd_zone_type* activated_next;  argument
219 	xfrd_zone_type* activated_prev;  argument
223 	uint16_t query_id;
224 	xfrd_xfr_type *latest_xfr;
226 	int multi_master_first_master; /* >0: first check master_num */
227 	int multi_master_update_check; /* -1: not update >0: last update master_num */