If an idle socket has received data unexpectedly, we...

net/base/client_socket.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_CLIENT_SOCKET_H_
 #define NET_BASE_CLIENT_SOCKET_H_
 
 #include "build/build_config.h"
 
 #if defined(OS_LINUX)
@@ skipping 29 matching lines @@
 
   // Called to disconnect a connected socket.  Does nothing if the socket is
   // already disconnected.  After calling Disconnect it is possible to call
   // Connect again to establish a new connection.
   virtual void Disconnect() = 0;
 
   // Called to test if the connection is still alive.  Returns false if a
   // connection wasn't established or the connection is dead.
   virtual bool IsConnected() const = 0;
 
+  // Called to test if the connection is still alive and idle.  Returns false
+  // if a connection wasn't established, the connection is dead, or some data
+  // have been received.
+  virtual bool IsConnectedAndIdle() const = 0;
+
 #if defined(OS_LINUX)
   // Identical to posix system call getpeername().
   // Needed by ssl_client_socket_nss.
   virtual int GetPeerName(struct sockaddr *name, socklen_t *namelen);
 #endif
 };
 
 }  // namespace net
 
 #endif  // NET_BASE_CLIENT_SOCKET_H_