Add the index information to network interface

runtime/bin/socket.h

 // Copyright (c) 2013, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef BIN_SOCKET_H_
 #define BIN_SOCKET_H_
 
 #include "bin/builtin.h"
 #include "bin/utils.h"
 #include "bin/dartutils.h"
@@ skipping 92 matching lines @@
  private:
   char as_string_[INET6_ADDRSTRLEN];
   RawAddr addr_;
 
   DISALLOW_COPY_AND_ASSIGN(SocketAddress);
 };
 
 class InterfaceSocketAddress {
  public:
   explicit InterfaceSocketAddress(struct sockaddr* sa,
-                                  const char* interface_name)
+                                  const char* interface_name,
+                                  intptr_t interface_index)
       : socket_address_(new SocketAddress(sa)),
-        interface_name_(interface_name) {}
+        interface_name_(interface_name),
+        interface_index_(interface_index) {}
 
   ~InterfaceSocketAddress() {
     delete socket_address_;
     free(const_cast<char*>(interface_name_));
   }
 
   SocketAddress* socket_address() const { return socket_address_; }
   const char* interface_name() const { return interface_name_; }
+  int interface_index() const { return interface_index_; }
 
  private:
   SocketAddress* socket_address_;
   const char* interface_name_;
+  intptr_t interface_index_;
 
   DISALLOW_COPY_AND_ASSIGN(InterfaceSocketAddress);
 };
 
 template<typename T>
 class AddressList {
  public:
   explicit AddressList(intptr_t count)
       : count_(count),
         addresses_(new T*[count_]) {}
@@ skipping 96 matching lines @@
 
  private:
   DISALLOW_ALLOCATION();
   DISALLOW_IMPLICIT_CONSTRUCTORS(ServerSocket);
 };
 
 }  // namespace bin
 }  // namespace dart
 
 #endif  // BIN_SOCKET_H_