Really connect to the same server in FTP network transaction.

net/base/address_list.h

 // Copyright (c) 2006-2008 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 NET_BASE_ADDRESS_LIST_H_
 #define NET_BASE_ADDRESS_LIST_H_
 
 #include "base/ref_counted.h"
 
 struct addrinfo;
 
 namespace net {
 
 // An AddressList object contains a linked list of addrinfo structures.  This
 // class is designed to be copied around by value.
 class AddressList {
  public:
   // Constructs an empty address list.
   AddressList() {}
 
   // Adopt the given addrinfo list in place of the existing one if any.  This
   // hands over responsibility for freeing the addrinfo list to the AddressList
   // object.
   void Adopt(struct addrinfo* head);
 
-  // Copies the given addrinfo rather than adopting it.
-  void Copy(const struct addrinfo* head);
+  // Copies the given addrinfo rather than adopting it. If |recursive| is true,
+  // all linked struct addrinfos will be copied as well. Otherwise only the head
+  // will be copied, and the rest of linked entries will be ignored.
+  void Copy(const struct addrinfo* head, bool recursive);
+
+  // Appends a copy of |head| and all its linked addrinfos to the stored
+  // addrinfo.
+  void Append(const struct addrinfo* head);
 
   // Sets the port of all addresses in the list to |port| (that is the
   // sin[6]_port field for the sockaddrs).
   void SetPort(int port);
 
   // Retrieves the port number of the first sockaddr in the list. (If SetPort()
   // was previously used on this list, then all the addresses will have this
   // same port number.)
   int GetPort() const;
 
@@ skipping 28 matching lines @@
   };
 
   explicit AddressList(Data* data) : data_(data) {}
 
   scoped_refptr<Data> data_;
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_ADDRESS_LIST_H_