Add support for getting the real process id from within the suid sandbox. The...

chrome/browser/zygote_host_linux.h

 // Copyright (c) 2009 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 CHROME_BROWSER_ZYGOTE_HOST_LINUX_H_
 #define CHROME_BROWSER_ZYGOTE_HOST_LINUX_H_
 
+#include <unistd.h>
+
 #include <string>
 #include <vector>
 
-#include <unistd.h>
-
 #include "base/global_descriptors_posix.h"
 #include "base/process.h"
 
 template<typename Type>
 struct DefaultSingletonTraits;
 
+static const char kZygoteMagic[] = "ZYGOTE_OK";
+
 // http://code.google.com/p/chromium/wiki/LinuxZygote
 
 // The zygote host is the interface, in the browser process, to the zygote
 // process.
 class ZygoteHost {
  public:
-  ~ZygoteHost();
+  void Init(const std::string& sandbox_cmd);
 
   pid_t ForkRenderer(const std::vector<std::string>& command_line,
                      const base::GlobalDescriptors::Mapping& mapping);
   void EnsureProcessTerminated(pid_t process);
 
   // Get the termination status (exit code) of the process and return true if
   // the status indicates the process crashed. |child_exited| is set to true
   // iff the child process has terminated. (|child_exited| may be NULL.)
   bool DidProcessCrash(base::ProcessHandle handle, bool* child_exited);
 
   // These are the command codes used on the wire between the browser and the
   // zygote.
   enum {
     kCmdFork = 0,             // Fork off a new renderer.
     kCmdReap = 1,             // Reap a renderer child.
     kCmdDidProcessCrash = 2,  // Check if child process crashed.
   };
 
   pid_t pid() const { return pid_; }
 
  private:
   friend struct DefaultSingletonTraits<ZygoteHost>;
   ZygoteHost();
-  void LaunchZygoteProcess();
+  ~ZygoteHost();
 
   int control_fd_;  // the socket to the zygote
   pid_t pid_;
+  bool init_;
 };
 
 #endif  // CHROME_BROWSER_ZYGOTE_HOST_LINUX_H_