content/common/child_process_host_impl.h

   1 // Copyright (c) 2012 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 #ifndef CONTENT_COMMON_CHILD_PROCESS_HOST_IMPL_H_
   6 #define CONTENT_COMMON_CHILD_PROCESS_HOST_IMPL_H_
   7
   8 #include <string>
   9 #include <vector>
  10
  11 #include "build/build_config.h"
  12
  13 #include "base/basictypes.h"
  14 #include "base/memory/scoped_ptr.h"
  15 #include "base/memory/shared_memory.h"
  16 #include "base/memory/singleton.h"
  17 #include "base/strings/string16.h"
  18 #include "content/public/common/child_process_host.h"
  19 #include "ipc/ipc_listener.h"
  20 #include "ui/gfx/gpu_memory_buffer.h"
  21
  22 namespace base {
  23 class FilePath;
  24 }
  25
  26 namespace IPC {
  27 class MessageFilter;
  28 }
  29
  30 namespace content {
  31 class ChildProcessHostDelegate;
  32
  33 // Provides common functionality for hosting a child process and processing IPC
  34 // messages between the host and the child process. Users are responsible
  35 // for the actual launching and terminating of the child processes.
  36 class CONTENT_EXPORT ChildProcessHostImpl : public ChildProcessHost,
  37                                             public IPC::Listener {
  38  public:
  39   ~ChildProcessHostImpl() override;
  40
  41   // Public and static for reuse by RenderMessageFilter.
  42   static void AllocateSharedMemory(
  43       size_t buffer_size, base::ProcessHandle child_process,
  44       base::SharedMemoryHandle* handle);
  45
  46   // Returns a unique ID to identify a child process. On construction, this
  47   // function will be used to generate the id_, but it is also used to generate
  48   // IDs for the RenderProcessHost, which doesn't inherit from us, and whose IDs
  49   // must be unique for all child processes.
  50   //
  51   // This function is threadsafe since RenderProcessHost is on the UI thread,
  52   // but normally this will be used on the IO thread.
  53   //
  54   // This will never return ChildProcessHost::kInvalidUniqueID.
  55   static int GenerateChildProcessUniqueId();
  56
  57   // ChildProcessHost implementation
  58   bool Send(IPC::Message* message) override;
  59   void ForceShutdown() override;
  60   std::string CreateChannel() override;
  61   bool IsChannelOpening() override;
  62   void AddFilter(IPC::MessageFilter* filter) override;
  63 #if defined(OS_POSIX)
  64   base::ScopedFD TakeClientFileDescriptor() override;
  65 #endif
  66
  67  private:
  68   friend class ChildProcessHost;
  69
  70   explicit ChildProcessHostImpl(ChildProcessHostDelegate* delegate);
  71
  72   // IPC::Listener methods:
  73   bool OnMessageReceived(const IPC::Message& msg) override;
  74   void OnChannelConnected(int32 peer_pid) override;
  75   void OnChannelError() override;
  76   void OnBadMessageReceived(const IPC::Message& message) override;
  77
  78   // Message handlers:
  79   void OnShutdownRequest();
  80   void OnAllocateSharedMemory(uint32 buffer_size,
  81                               base::SharedMemoryHandle* handle);
  82   void OnAllocateGpuMemoryBuffer(uint32 width,
  83                                  uint32 height,
  84                                  gfx::GpuMemoryBuffer::Format format,
  85                                  gfx::GpuMemoryBuffer::Usage usage,
  86                                  IPC::Message* reply);
  87   void OnDeletedGpuMemoryBuffer(gfx::GpuMemoryBufferType type,
  88                                 gfx::GpuMemoryBufferId id,
  89                                 uint32 sync_point);
  90
  91   void GpuMemoryBufferAllocated(IPC::Message* reply,
  92                                 const gfx::GpuMemoryBufferHandle& handle);
  93
  94   ChildProcessHostDelegate* delegate_;
  95   base::ProcessHandle peer_handle_;
  96   bool opening_channel_;  // True while we're waiting the channel to be opened.
  97   scoped_ptr<IPC::Channel> channel_;
  98   std::string channel_id_;
  99
 100   // Holds all the IPC message filters.  Since this object lives on the IO
 101   // thread, we don't have a IPC::ChannelProxy and so we manage filters
 102   // manually.
 103   std::vector<scoped_refptr<IPC::MessageFilter> > filters_;
 104
 105   DISALLOW_COPY_AND_ASSIGN(ChildProcessHostImpl);
 106 };
 107
 108 }  // namespace content
 109
 110 #endif  // CONTENT_COMMON_CHILD_PROCESS_HOST_IMPL_H_