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

net/socket/tcp_server_socket_libevent.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_LIBEVENT_H_
 #define NET_SOCKET_TCP_SERVER_SOCKET_LIBEVENT_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "base/message_loop.h"
 #include "base/threading/non_thread_safe.h"
@@ skipping 17 matching lines @@
   // net::ServerSocket implementation.
   virtual int Listen(const net::IPEndPoint& address, int backlog) OVERRIDE;
   virtual int GetLocalAddress(IPEndPoint* address) const OVERRIDE;
   virtual int Accept(scoped_ptr<StreamSocket>* socket,
                      const CompletionCallback& callback) OVERRIDE;
 
   // MessageLoopForIO::Watcher implementation.
   virtual void OnFileCanReadWithoutBlocking(int fd) OVERRIDE;
   virtual void OnFileCanWriteWithoutBlocking(int fd) OVERRIDE;
 
+  // Sets corresponding flags 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();

[Sergey Ulanov, 2012/09/12 21:52:35]

nit: put this above MessageLoopForIO::Watcher

[justinlin, 2012/09/13 07:12:56]

Done.

+
  private:
   int AcceptInternal(scoped_ptr<StreamSocket>* socket);
   void Close();
+  int SetSocketOptions();

[Sergey Ulanov, 2012/09/12 21:52:35]

nit: I would place it before AcceptInternal() to reflect the order in which this
methods are normally called.

[justinlin, 2012/09/13 07:12:56]

Done.

[wtc, 2012/09/13 18:31:55]

This seems like a good idea. To be consistent, should we
also declare AllowAddressReuse() before Listen()?

NOTE: I noticed the mismatch of declaration and definition
orders between .h and .cc. But I think the original code
already has a mismatch, and it seems that you have done
your best to match the order.

[justinlin, 2012/09/14 03:54:40]

Done.

 
   int socket_;
 
   MessageLoopForIO::FileDescriptorWatcher accept_socket_watcher_;
 
   scoped_ptr<StreamSocket>* accept_socket_;
   CompletionCallback accept_callback_;
 
+  bool reuse_addr_;

[Sergey Ulanov, 2012/09/12 21:52:35]

nit: reuse_address_

[justinlin, 2012/09/13 07:12:56]

Done.

+
   BoundNetLog net_log_;
 };
 
 }  // namespace net
 
 #endif  // NET_SOCKET_TCP_SERVER_SOCKET_LIBEVENT_H_