Distinguish in the browser between renderer crashes and kills

components/crash/content/browser/crash_micro_dump_manager_android.h

+// Copyright 2015 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef COMPONENTS_CRASH_CONTENT_BROWSER_CRASH_MICRO_DUMP_MANAGER_ANDROID_H_
+#define COMPONENTS_CRASH_CONTENT_BROWSER_CRASH_MICRO_DUMP_MANAGER_ANDROID_H_
+
+#include <map>
+
+#include "base/files/file.h"
+#include "base/process/kill.h"
+#include "base/synchronization/lock.h"
+#include "content/public/browser/browser_child_process_observer.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+
+namespace breakpad {
+
+// This class manages behavior of the browser on renderer crashes when
+// microdumps are used for capturing the crash stack.  Normally, in this case
+// the browser doesn't need to do much, because a microdump is written into
+// Android log by the renderer process itself.  However, the browser may need to
+// crash itself on a renderer crash.  Since on Android renderers are not child
+// processes of the browser, it can't access the exit code. Instead, the browser
+// uses a dedicated pipe in order to receive the information about the renderer
+// crash status.
+class CrashMicroDumpManager : public content::BrowserChildProcessObserver,
+                              public content::NotificationObserver {
+ public:
+  // The embedder should create a single instance of the CrashMicroDumpManager.
+  static CrashMicroDumpManager* GetInstance();
+
+  // Should be created on the UI thread.
+  CrashMicroDumpManager();
+
+  ~CrashMicroDumpManager() override;
+
+  // Returns a pipe that should be used to transfer termination cause of
+  // |child_process_id|.
+  base::File CreateCrashInfoChannel(int child_process_id);
+
+ private:
+  static void HandleChildTermination(
+      int pipe_fd,
+      base::TerminationStatus termination_status);
+
+  // content::BrowserChildProcessObserver implementation:
+  void BrowserChildProcessHostDisconnected(
+      const content::ChildProcessData& data) override;
+  void BrowserChildProcessCrashed(
+      const content::ChildProcessData& data,
+      int exit_code) override;
+
+  // NotificationObserver implementation:
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
+
+  // Called on child process exit (including crash).
+  void OnChildExit(int child_process_id,
+                   base::TerminationStatus termination_status);
+
+  content::NotificationRegistrar notification_registrar_;
+
+  // This map should only be accessed with its lock aquired as it is accessed
+  // from the PROCESS_LAUNCHER and UI threads.
+  base::Lock child_process_id_to_pipe_fd_lock_;
+  std::map<int, int> child_process_id_to_pipe_fd_;
+
+  static CrashMicroDumpManager* instance_;
+
+  DISALLOW_COPY_AND_ASSIGN(CrashMicroDumpManager);
+};
+
+}  // namespace breakpad
+
+#endif  // COMPONENTS_CRASH_CONTENT_BROWSER_CRASH_MICRO_DUMP_MANAGER_ANDROID_H_