Cancel the dns lookup in dns_ares_shutdown

1 files changed, 7 insertions, 1 deletions

diff --git a/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h b/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h
index 9bcc115beb..4a8374a192 100644
--- a/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h
+++ b/src/core/ext/filters/client_channel/resolver/dns/c_ares/grpc_ares_wrapper.h
@@ -40,6 +40,8 @@
 #include "src/core/lib/iomgr/polling_entity.h"
 #include "src/core/lib/iomgr/resolve_address.h"
 
+typedef struct grpc_ares_request grpc_ares_request;
+
 /* Asynchronously resolve addr. Use \a default_port if a port isn't designated
    in addr, otherwise use the port in addr. grpc_ares_init() must be called at
    least once before this function. \a on_done may be called directly in this
@@ -59,11 +61,15 @@ extern void (*grpc_resolve_address_ares)(grpc_exec_ctx *exec_ctx,
   function. \a on_done may be called directly in this function without being
   scheduled with \a exec_ctx, it must not try to acquire locks that are being
   held by the caller. */
-extern void (*grpc_dns_lookup_ares)(
+extern grpc_ares_request *(*grpc_dns_lookup_ares)(
     grpc_exec_ctx *exec_ctx, const char *dns_server, const char *addr,
     const char *default_port, grpc_pollset_set *interested_parties,
     grpc_closure *on_done, grpc_lb_addresses **addresses, bool check_grpclb);
 
+/* Cancel the pending grpc_ares_request \a request */
+void grpc_cancel_ares_request(grpc_exec_ctx *exec_ctx,
+                              grpc_ares_request *request);
+
 /* Initialize gRPC ares wrapper. Must be called at least once before
    grpc_resolve_address_ares(). */
 grpc_error *grpc_ares_init(void);