POSIX: Transfer network data using shared memory

chrome/common/resource_dispatcher.cc

 // 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.
 
 // See http://dev.chromium.org/developers/design-documents/multi-process-resource-loading
 
 #include "chrome/common/resource_dispatcher.h"
 
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
@@ skipping 324 matching lines @@
 
 void ResourceDispatcher::OnReceivedData(int request_id,
                                         base::SharedMemoryHandle shm_handle,
                                         int data_len) {
   // Acknowlegde the reception of this data.
   IPC::Message::Sender* sender = message_sender();
   if (sender)
     sender->Send(
         new ViewHostMsg_DataReceived_ACK(MSG_ROUTING_NONE, request_id));
 
-  DCHECK((shm_handle && data_len > 0) || (!shm_handle && !data_len));
+  const bool shm_valid = base::SharedMemory::IsHandleValid(shm_handle);
+  DCHECK((shm_valid && data_len > 0) || (!shm_valid && !data_len));
   base::SharedMemory shared_mem(shm_handle, true);  // read only
 
   PendingRequestList::iterator it = pending_requests_.find(request_id);
   if (it == pending_requests_.end()) {
     // this might happen for kill()ed requests on the webkit end, so perhaps
     // it shouldn't be a warning...
     DLOG(WARNING) << "Got data for a nonexistant or finished request";
     return;
   }
 
@@ skipping 155 matching lines @@
     case ViewMsg_Resource_RequestComplete::ID:
       return true;
 
     default:
       break;
   }
 
   return false;
 }