content/browser/browser_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_BROWSER_BROWSER_CHILD_PROCESS_HOST_IMPL_H_
   6 #define CONTENT_BROWSER_BROWSER_CHILD_PROCESS_HOST_IMPL_H_
   7
   8 #include <list>
   9
  10 #include "base/compiler_specific.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "base/process/process.h"
  13 #include "base/synchronization/waitable_event_watcher.h"
  14 #include "content/browser/child_process_launcher.h"
  15 #include "content/browser/power_monitor_message_broadcaster.h"
  16 #include "content/public/browser/browser_child_process_host.h"
  17 #include "content/public/browser/child_process_data.h"
  18 #include "content/public/common/child_process_host_delegate.h"
  19
  20 #if defined(OS_WIN)
  21 #include "base/win/object_watcher.h"
  22 #endif
  23
  24 namespace base {
  25 class CommandLine;
  26 }
  27
  28 namespace content {
  29
  30 class BrowserChildProcessHostIterator;
  31 class BrowserChildProcessObserver;
  32 class BrowserMessageFilter;
  33
  34 // Plugins/workers and other child processes that live on the IO thread use this
  35 // class. RenderProcessHostImpl is the main exception that doesn't use this
  36 /// class because it lives on the UI thread.
  37 class CONTENT_EXPORT BrowserChildProcessHostImpl
  38     : public BrowserChildProcessHost,
  39       public NON_EXPORTED_BASE(ChildProcessHostDelegate),
  40 #if defined(OS_WIN)
  41       public base::win::ObjectWatcher::Delegate,
  42 #endif
  43       public ChildProcessLauncher::Client {
  44  public:
  45   BrowserChildProcessHostImpl(
  46       int process_type,
  47       BrowserChildProcessHostDelegate* delegate);
  48   ~BrowserChildProcessHostImpl() override;
  49
  50   // Terminates all child processes and deletes each BrowserChildProcessHost
  51   // instance.
  52   static void TerminateAll();
  53
  54   // BrowserChildProcessHost implementation:
  55   bool Send(IPC::Message* message) override;
  56   void Launch(SandboxedProcessLauncherDelegate* delegate,
  57               base::CommandLine* cmd_line) override;
  58   const ChildProcessData& GetData() const override;
  59   ChildProcessHost* GetHost() const override;
  60   base::TerminationStatus GetTerminationStatus(bool known_dead,
  61                                                int* exit_code) override;
  62   void SetName(const base::string16& name) override;
  63   void SetHandle(base::ProcessHandle handle) override;
  64
  65   // ChildProcessHostDelegate implementation:
  66   bool CanShutdown() override;
  67   void OnChildDisconnected() override;
  68   const base::Process& GetProcess() const override;
  69   bool OnMessageReceived(const IPC::Message& message) override;
  70   void OnChannelConnected(int32 peer_pid) override;
  71   void OnChannelError() override;
  72   void OnBadMessageReceived(const IPC::Message& message) override;
  73
  74   // Removes this host from the host list. Calls ChildProcessHost::ForceShutdown
  75   void ForceShutdown();
  76
  77   // Callers can reduce the BrowserChildProcess' priority.
  78   void SetBackgrounded(bool backgrounded);
  79
  80   // Controls whether the child process should be terminated on browser
  81   // shutdown. Default is to always terminate.
  82   void SetTerminateChildOnShutdown(bool terminate_on_shutdown);
  83
  84   // Adds an IPC message filter.
  85   void AddFilter(BrowserMessageFilter* filter);
  86
  87   // Called when an instance of a particular child is created in a page.
  88   static void NotifyProcessInstanceCreated(const ChildProcessData& data);
  89
  90   static void HistogramBadMessageTerminated(int process_type);
  91
  92   BrowserChildProcessHostDelegate* delegate() const { return delegate_; }
  93
  94   typedef std::list<BrowserChildProcessHostImpl*> BrowserChildProcessList;
  95  private:
  96   friend class BrowserChildProcessHostIterator;
  97   friend class BrowserChildProcessObserver;
  98
  99   static BrowserChildProcessList* GetIterator();
 100
 101   static void AddObserver(BrowserChildProcessObserver* observer);
 102   static void RemoveObserver(BrowserChildProcessObserver* observer);
 103
 104   // ChildProcessLauncher::Client implementation.
 105   void OnProcessLaunched() override;
 106   void OnProcessLaunchFailed() override;
 107
 108 #if defined(OS_WIN)
 109   // ObjectWatcher::Delegate implementation.
 110   void OnObjectSignaled(HANDLE object) override;
 111 #endif
 112
 113   ChildProcessData data_;
 114   BrowserChildProcessHostDelegate* delegate_;
 115   scoped_ptr<ChildProcessHost> child_process_host_;
 116
 117   scoped_ptr<ChildProcessLauncher> child_process_;
 118
 119   PowerMonitorMessageBroadcaster power_monitor_message_broadcaster_;
 120
 121 #if defined(OS_WIN)
 122   // Watches to see if the child process exits before the IPC channel has
 123   // been connected. Thereafter, its exit is determined by an error on the
 124   // IPC channel.
 125   base::win::ObjectWatcher early_exit_watcher_;
 126 #endif
 127 };
 128
 129 }  // namespace content
 130
 131 #endif  // CONTENT_BROWSER_BROWSER_CHILD_PROCESS_HOST_IMPL_H_