2 // Copyright 2019 gRPC authors.
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
8 // http://www.apache.org/licenses/LICENSE-2.0
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.
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.
20 #include <grpc/support/port_platform.h>
22 #include "src/core/ext/filters/client_channel/resolver/dns/dns_resolver_selection.h"
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 "