[NaCl SDK] nacl_io: add getnameinfo scaffolding

native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc

Index: native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc
diff --git a/native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc b/native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc
index 7574d062a0033fc9059d71bd6b9edc067485a136..a35e1822110b8874539578f079b5edd46414f13a 100644
--- a/native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc
+++ b/native_client_sdk/src/libraries/nacl_io/kernel_proxy.cc
@@ -1356,6 +1356,17 @@ int KernelProxy::getaddrinfo(const char* node,
   return host_resolver_.getaddrinfo(node, service, hints, res);
 }
 
+int KernelProxy::getnameinfo(const struct sockaddr *sa,
+                             socklen_t salen,
+                             char *host,
+                             size_t hostlen,
+                             char *serv,
+                             size_t servlen,
+                             int flags) {
+  return host_resolver_.getnameinfo(sa, salen, host, hostlen, serv, servlen,
+                                    flags);
+}
+
 struct hostent* KernelProxy::gethostbyname(const char* name) {
   return host_resolver_.gethostbyname(name);
 }