src/chrome/renderer/pepper/pepper_shared_memory_message_filter.cc

   1 // Copyright (c) 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "chrome/renderer/pepper/pepper_shared_memory_message_filter.h"
   6
   7 #include "base/memory/scoped_ptr.h"
   8 #include "base/memory/shared_memory.h"
   9 #include "base/process/process_handle.h"
  10 #include "content/public/common/content_client.h"
  11 #include "content/public/renderer/pepper_plugin_instance.h"
  12 #include "content/public/renderer/render_thread.h"
  13 #include "content/public/renderer/renderer_ppapi_host.h"
  14 #include "ppapi/host/ppapi_host.h"
  15 #include "ppapi/proxy/ppapi_messages.h"
  16 #include "ppapi/shared_impl/var_tracker.h"
  17
  18 PepperSharedMemoryMessageFilter::PepperSharedMemoryMessageFilter(
  19     content::RendererPpapiHost* host)
  20     : InstanceMessageFilter(host->GetPpapiHost()), host_(host) {}
  21
  22 PepperSharedMemoryMessageFilter::~PepperSharedMemoryMessageFilter() {}
  23
  24 bool PepperSharedMemoryMessageFilter::OnInstanceMessageReceived(
  25     const IPC::Message& msg) {
  26   bool handled = true;
  27   IPC_BEGIN_MESSAGE_MAP(PepperSharedMemoryMessageFilter, msg)
  28   IPC_MESSAGE_HANDLER(PpapiHostMsg_SharedMemory_CreateSharedMemory,
  29                       OnHostMsgCreateSharedMemory)
  30   IPC_MESSAGE_UNHANDLED(handled = false)
  31   IPC_END_MESSAGE_MAP()
  32   return handled;
  33 }
  34
  35 bool PepperSharedMemoryMessageFilter::Send(IPC::Message* msg) {
  36   return host_->GetPpapiHost()->Send(msg);
  37 }
  38
  39 void PepperSharedMemoryMessageFilter::OnHostMsgCreateSharedMemory(
  40     PP_Instance instance,
  41     uint32_t size,
  42     int* host_handle_id,
  43     ppapi::proxy::SerializedHandle* plugin_handle) {
  44   plugin_handle->set_null_shmem();
  45   *host_handle_id = -1;
  46   scoped_ptr<base::SharedMemory> shm(content::RenderThread::Get()
  47                                          ->HostAllocateSharedMemoryBuffer(size)
  48                                          .Pass());
  49   if (!shm.get())
  50     return;
  51
  52   base::SharedMemoryHandle host_shm_handle;
  53   shm->ShareToProcess(base::GetCurrentProcessHandle(), &host_shm_handle);
  54   *host_handle_id =
  55       content::PepperPluginInstance::Get(instance)
  56           ->GetVarTracker()
  57           ->TrackSharedMemoryHandle(instance, host_shm_handle, size);
  58
  59   base::PlatformFile host_handle =
  60 #if defined(OS_WIN)
  61       host_shm_handle;
  62 #elif defined(OS_POSIX)
  63       host_shm_handle.fd;
  64 #else
  65 #error Not implemented.
  66 #endif
  67   // We set auto_close to false since we need our file descriptor to
  68   // actually be duplicated on linux. The shared memory destructor will
  69   // close the original handle for us.
  70   plugin_handle->set_shmem(host_->ShareHandleWithRemote(host_handle, false),
  71                            size);
  72 }