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

net/socket/tcp_server_socket_libevent.h

Index: net/socket/tcp_server_socket_libevent.h
diff --git a/net/socket/tcp_server_socket_libevent.h b/net/socket/tcp_server_socket_libevent.h
index 946cc50f949d56911d0a0a437a0c02b3dfd95165..1760395697d79b663cd5f7a3e4f3e64493475d8a 100644
--- a/net/socket/tcp_server_socket_libevent.h
+++ b/net/socket/tcp_server_socket_libevent.h
@@ -35,9 +35,15 @@ class NET_EXPORT_PRIVATE TCPServerSocketLibevent
   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_;
 
@@ -46,6 +52,8 @@ class NET_EXPORT_PRIVATE TCPServerSocketLibevent
   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_;
 };