[NaCl SDK] nacl_io: add getnameinfo scaffolding

native_client_sdk/src/libraries/nacl_io/host_resolver.h

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef LIBRARIES_NACL_IO_HOST_RESOLVER_H_
 #define LIBRARIES_NACL_IO_HOST_RESOLVER_H_
 
 #include "nacl_io/ossocket.h"
 #include "nacl_io/pepper_interface.h"
 #include "sdk_util/simple_lock.h"
 
 #ifdef PROVIDES_SOCKET_API
 
 namespace nacl_io {
 
 class HostResolver {
  public:
   HostResolver();
   ~HostResolver();
 
   void Init(PepperInterface* ppapi);
 
   void freeaddrinfo(struct addrinfo* res);
+  int getnameinfo(const struct sockaddr *sa,
+                  socklen_t salen,
+                  char *host,
+                  size_t hostlen,
+                  char *serv,
+                  size_t servlen,
+                  int flags);
   int getaddrinfo(const char* node,
                   const char* service,
                   const struct addrinfo* hints,
                   struct addrinfo** res);
   struct hostent* gethostbyname(const char* name);
 
  private:
   void hostent_initialize();
   void hostent_cleanup();
 
   struct hostent hostent_;
   PepperInterface* ppapi_;
   sdk_util::SimpleLock gethostbyname_lock_;
 };
 
 }  // namespace nacl_io
 
 #endif  // PROVIDES_SOCKET_API
 #endif  // LIBRARIES_NACL_IO_HOST_RESOLVER_H_