71     return this.callback(dnsException(err, 'getaddrinfo', this.hostname));
73   this.callback(null, addresses[0], this.family || isIP(addresses[0]));
79     return this.callback(dnsException(err, 'getaddrinfo', this.hostname));
91   this.callback(null, addresses);
97 function lookup(hostname, options, callback) {  argument
107     callback = options;
109   } else if (typeof callback !== 'function') {
110     throw new ERR_INVALID_CALLBACK(callback);
129       process.nextTick(callback, null, []);
131       process.nextTick(callback, null, null, family === 6 ? 6 : 4);
140         callback, null, [{ address: hostname, family: matchedFamily }]);
142       process.nextTick(callback, null, hostname, matchedFamily);
148   req.callback = callback;
157     process.nextTick(callback, dnsException(err, 'getaddrinfo', hostname));
169     return this.callback(dnsException(err, 'getnameinfo', this.hostname));
171   this.callback(null, hostname, service);
175 function lookupService(address, port, callback) {  argument
184   if (typeof callback !== 'function')
185     throw new ERR_INVALID_CALLBACK(callback);
190   req.callback = callback;
210     this.callback(dnsException(err, this.bindingName, this.hostname));
212     this.callback(null, result);
216   function query(name, /* options, */ callback) {  argument
219       options = callback;
220       callback = arguments[2];
224     if (typeof callback !== 'function') {
225       throw new ERR_INVALID_CALLBACK(callback);
230     req.callback = callback;
259 function resolve(hostname, rrtype, callback) {  argument
265     callback = rrtype;
271     return ReflectApply(resolver, this, [hostname, callback]);