Adding non-tracking mode support to AddressTracker.

net/base/address_tracker_linux.h

 // Copyright (c) 2012 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_TRACKER_LINUX_H_
 #define NET_BASE_ADDRESS_TRACKER_LINUX_H_
 
 #include <sys/socket.h>  // Needed to include netlink.
 // Mask superfluous definition of |struct net|. This is fixed in Linux 2.6.38.
 #define net net_kernel
@@ skipping 23 matching lines @@
   typedef std::map<IPAddressNumber, struct ifaddrmsg> AddressMap;
 
   // Will run |address_callback| when the AddressMap changes, |link_callback|
   // when the list of online links changes, and |tunnel_callback| when the list
   // of online tunnels changes.
   AddressTrackerLinux(const base::Closure& address_callback,
                       const base::Closure& link_callback,
                       const base::Closure& tunnel_callback);
   virtual ~AddressTrackerLinux();
 
-  // Starts watching system configuration for changes. The current thread must
-  // have a MessageLoopForIO.
-  void Init();
+  // When |track| is true, it starts watching system configuration for
+  // changes. The current thread must have a
+  // MessageLoopForIO. Otherwise, the |AddressMap| and |online_links_|
+  // will be a one time snapshot of current system configuration.
+  void Init(bool track);
 
   AddressMap GetAddressMap() const;
+  base::hash_set<int> GetOnlineLinks() const;
 
   // Implementation of NetworkChangeNotifierLinux::GetCurrentConnectionType().
   // Safe to call from any thread, but will block until Init() has completed.
   NetworkChangeNotifier::ConnectionType GetCurrentConnectionType();
 
  private:
   friend class AddressTrackerLinuxTest;
 
   // A function that returns the name of an interface given the interface index
   // in |interface_index|.
@@ skipping 39 matching lines @@
   base::Closure link_callback_;
   base::Closure tunnel_callback_;
 
   int netlink_fd_;
   base::MessageLoopForIO::FileDescriptorWatcher watcher_;
 
   mutable base::Lock address_map_lock_;
   AddressMap address_map_;
 
   // Set of interface indices for links that are currently online.
+  mutable base::Lock online_links_lock_;
   base::hash_set<int> online_links_;
 
   base::Lock is_offline_lock_;
   bool is_offline_;
   bool is_offline_initialized_;
   base::ConditionVariable is_offline_initialized_cv_;
 };
 
 }  // namespace internal
 }  // namespace net
 
 #endif  // NET_BASE_ADDRESS_TRACKER_LINUX_H_