[Chrome源码阅读]IPC通信初探

最新推荐文章于 2024-11-05 17:15:04 发布

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最新推荐文章于 2024-11-05 17:15:04 发布 · 7.7k 阅读

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#chrome #class #security #access

本文介绍了Chrome中RenderWidgetHost如何处理来自RenderProcess的IPC消息。通过分析`IPC_DEFINE_MESSAGE_MAP`等宏的使用，揭示了Chrome如何根据消息类型调用相应的处理函数，实现了进程间通信的关键步骤。

RenderWidgetHost继承于IPC::Channel::Listener，所以它必然需要实现Listener::OnMessageReceived纯虚函数。

Chrome对这个函数进行了宏的封装，宏的写法有点类似于MFC/wxWidget的事件响应表，不同点在于Chrome里的宏是对函数的实现封装，而MFC/wxWidget里却是对事件表的初始化。

IPC::Channel::Sender类的实现

class Channel : public Message ::Sender {
  // Security tests need access to the pipe handle.
  friend class ChannelTest ;

  public:
  // Implemented by consumers of a Channel to receive messages.
  class Listener {
   public:
    virtual ~ Listener () {}

    // Called when a message is received.
    virtual void OnMessageReceived ( const Message & message ) = 0;

    // Called when the channel is connected and we have received the internal
    // Hello message from the peer.
    virtual void OnChannelConnected ( int32 peer_pid ) {}

    // Called when an error is detected that causes the channel to close.
    // This