Mojo: Implement plumbing to support passing handles over MessagePipes.

mojo/system/message_pipe.cc

 // Copyright 2013 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.
 
 #include "mojo/system/message_pipe.h"
 
 #include "base/logging.h"
 #include "base/stl_util.h"
 #include "mojo/system/channel.h"
 #include "mojo/system/local_message_pipe_endpoint.h"
@@ skipping 46 matching lines @@
     endpoints_[destination_port]->Close();
     endpoints_[destination_port].reset();
   }
 }
 
 // TODO(vtl): Support sending handles.
 // TODO(vtl): Handle flags.
 MojoResult MessagePipe::WriteMessage(
     unsigned port,
     const void* bytes, uint32_t num_bytes,
-    const MojoHandle* /*handles*/, uint32_t /*num_handles*/,
+    const std::vector<Dispatcher*>* /*dispatchers*/,
     MojoWriteMessageFlags flags) {
   DCHECK(port == 0 || port == 1);
   return EnqueueMessage(
       GetPeerPort(port),
       MessageInTransit::Create(
           MessageInTransit::kTypeMessagePipeEndpoint,
           MessageInTransit::kSubtypeMessagePipeEndpointData,
           bytes, num_bytes));
 }
 
-MojoResult MessagePipe::ReadMessage(unsigned port,
-                                    void* bytes, uint32_t* num_bytes,
-                                    MojoHandle* handles, uint32_t* num_handles,
-                                    MojoReadMessageFlags flags) {
+MojoResult MessagePipe::ReadMessage(
+    unsigned port,
+    void* bytes, uint32_t* num_bytes,
+    uint32_t max_num_dispatchers,
+    std::vector<scoped_refptr<Dispatcher> >* dispatchers,
+    MojoReadMessageFlags flags) {
   DCHECK(port == 0 || port == 1);
 
   base::AutoLock locker(lock_);
   DCHECK(endpoints_[port].get());
 
   return endpoints_[port]->ReadMessage(bytes, num_bytes,
-                                       handles, num_handles,
+                                       NULL, NULL,
                                        flags);
 }
 
 MojoResult MessagePipe::AddWaiter(unsigned port,
                                   Waiter* waiter,
                                   MojoWaitFlags flags,
                                   MojoResult wake_result) {
   DCHECK(port == 0 || port == 1);
 
   base::AutoLock locker(lock_);
@@ skipping 94 matching lines @@
       rv = MOJO_RESULT_UNKNOWN;
       break;
   }
 
   message->Destroy();
   return rv;
 }
 
 }  // namespace system
 }  // namespace mojo