1 NETDB_INTERNAL* = -1; (* See errno. *)
2 NETDB_SUCCESS* = 0; (* No problem. *)
3 HOST_NOT_FOUND* = 1; (* Authoritative Answer Host not found. *)
4 TRY_AGAIN* = 2; (* Non-Authoritative Host not found, or SERVERFAIL. *)
5 NO_RECOVERY* = 3; (* Non recoverable errors, FORMERR, REFUSED, NOTIMP. *)
6 NO_DATA* = 4; (* Valid name, no data record of requested type. *)