Linux: inform the Zygote when it's waiting on a dead process

content/browser/child_process_launcher.h

 // Copyright (c) 2012 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 CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_H_
 #define CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_H_
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/process_util.h"
@@ skipping 35 matching lines @@
       int child_process_id,
       Client* client);
   ~ChildProcessLauncher();
 
   // True if the process is being launched and so the handle isn't available.
   bool IsStarting();
 
   // Getter for the process handle.  Only call after the process has started.
   base::ProcessHandle GetHandle();
 
-  // Call this when the child process exits to know what happened to
-  // it.  |exit_code| is the exit code of the process if it exited
-  // (e.g. status from waitpid if on posix, from GetExitCodeProcess on
-  // Windows). |exit_code| may be NULL.
-  base::TerminationStatus GetChildTerminationStatus(int* exit_code);
+  // Call this when the child process exits to know what happened to it.
+  // |known_dead| can be true if we already know the process is dead as it can
+  // help the implemention figure the proper TerminationStatus.
+  // |exit_code| is the exit code of the process if it exited (e.g. status from
+  // waitpid if on posix, from GetExitCodeProcess on Windows). |exit_code| may
+  // be NULL.
+  base::TerminationStatus GetChildTerminationStatus(bool known_dead,
+                                                    int* exit_code);
 
   // Changes whether the process runs in the background or not.  Only call
   // this after the process has started.
   void SetProcessBackgrounded(bool background);
 
   // Controls whether the child process should be terminated on browser
   // shutdown.
   void SetTerminateChildOnShutdown(bool terminate_on_shutdown);
 
  private:
   class Context;
 
   scoped_refptr<Context> context_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildProcessLauncher);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_CHILD_PROCESS_LAUNCHER_H_