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