1 // 2 // Copyright 2019 gRPC authors. 3 // 4 // Licensed under the Apache License, Version 2.0 (the "License"); 5 // you may not use this file except in compliance with the License. 6 // You may obtain a copy of the License at 7 // 8 // http://www.apache.org/licenses/LICENSE-2.0 9 // 10 // Unless required by applicable law or agreed to in writing, software 11 // distributed under the License is distributed on an "AS IS" BASIS, 12 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 // See the License for the specific language governing permissions and 14 // limitations under the License. 15 // 16 17 // This is similar to the sockaddr resolver, except that it supports a 18 // bunch of query args that are useful for dependency injection in tests. 19 20 #include <grpc/support/port_platform.h> 21 22 #include "src/core/ext/filters/client_channel/resolver/dns/dns_resolver_selection.h" 23 24 GPR_GLOBAL_CONFIG_DEFINE_STRING( 25 grpc_dns_resolver, "", 26 "Declares which DNS resolver to use. The default is ares if gRPC is built " 27 "with c-ares support. Otherwise, the value of this environment variable is " 28 "ignored.") 29