Allow server sockets to rebind to same port if there is nothing actively listening on that port.

net/socket/tcp_server_socket_win.h

 // Copyright (c) 2011 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_SOCKET_TCP_SERVER_SOCKET_WIN_H_
 #define NET_SOCKET_TCP_SERVER_SOCKET_WIN_H_
 
 #include <winsock2.h>
 
 #include "base/memory/scoped_ptr.h"
@@ skipping 19 matching lines @@
 
   // net::ServerSocket implementation.
   virtual int Listen(const net::IPEndPoint& address, int backlog);
   virtual int GetLocalAddress(IPEndPoint* address) const;
   virtual int Accept(scoped_ptr<StreamSocket>* socket,
                      const CompletionCallback& callback);
 
   // base::ObjectWatcher::Delegate implementation.
   virtual void OnObjectSignaled(HANDLE object);
 
+  // Sets corresponding flags in |socket_options_| to allow the socket
+  // to share the local address to which the socket will be bound with
+  // other processes. Should be called before Bind().
+  void AllowAddressReuse();
+
  private:
   int AcceptInternal(scoped_ptr<StreamSocket>* socket);
   void Close();
 
+  enum SocketOptions {
+    SOCKET_OPTION_REUSE_ADDRESS = 1 << 0,
+  }

[Sergey Ulanov, 2012/09/12 19:38:24]

I think you are missing semicolon here

[justinlin, 2012/09/12 21:11:00]

Ack

+
+  // Applies |socket_options_| to |socket_|. Should be called before
+  // Bind().
+  int SetSocketOptions();
+
   SOCKET socket_;
   HANDLE socket_event_;
 
+  // Bitwise-or'd combination of SocketOptions. Specifies the set of
+  // options that should be applied to |socket_| before Bind().
+  int socket_options_;
+
   base::win::ObjectWatcher accept_watcher_;
 
   scoped_ptr<StreamSocket>* accept_socket_;
   CompletionCallback accept_callback_;
 
   BoundNetLog net_log_;
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_TCP_SERVER_SOCKET_WIN_H_