Move the Linux zygote stuff into its own per-process directory.

content/browser/zygote_host_impl_linux.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_ZYGOTE_HOST_IMPL_LINUX_H_
 #define CONTENT_BROWSER_ZYGOTE_HOST_IMPL_LINUX_H_
 #pragma once
 
 #include <string>
 #include <vector>
 
 #include "base/global_descriptors_posix.h"
 #include "base/process_util.h"
 #include "base/synchronization/lock.h"
 #include "content/public/browser/zygote_host_linux.h"
 
 template<typename Type>
 struct DefaultSingletonTraits;
 
-static const char kZygoteMagic[] = "ZYGOTE_OK";
-
 class CONTENT_EXPORT ZygoteHostImpl : public content::ZygoteHost {
  public:
   // Returns the singleton instance.
   static ZygoteHostImpl* GetInstance();
 
   void Init(const std::string& sandbox_cmd);
 
   // Tries to start a process of type indicated by process_type.
   // Returns its pid on success, otherwise
   // base::kNullProcessHandle;
   pid_t ForkRequest(const std::vector<std::string>& command_line,
                     const base::GlobalDescriptors::Mapping& mapping,
                     const std::string& process_type);
   void EnsureProcessTerminated(pid_t process);
 
   // Get the termination status (and, optionally, the exit code) of
   // the process. |exit_code| is set to the exit code of the child
   // process. (|exit_code| may be NULL.)
   base::TerminationStatus GetTerminationStatus(base::ProcessHandle handle,
                                                int* exit_code);
 
-  // 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.
-    kCmdGetTerminationStatus = 2,  // Check what happend to a child process.
-    kCmdGetSandboxStatus = 3,      // Read a bitmask of kSandbox*
-  };
-
   // ZygoteHost implementation:
   virtual pid_t GetPid() const OVERRIDE;
   virtual pid_t GetSandboxHelperPid() const OVERRIDE;
   virtual int GetSandboxStatus() const OVERRIDE;
   virtual void AdjustRendererOOMScore(base::ProcessHandle process_handle,
                                       int score) OVERRIDE;
   virtual void AdjustLowMemoryMargin(int64 margin_mb) OVERRIDE;
 
  private:
   friend struct DefaultSingletonTraits<ZygoteHostImpl>;
   ZygoteHostImpl();
   virtual ~ZygoteHostImpl();
 
   ssize_t ReadReply(void* buf, size_t buflen);
 
   int control_fd_;  // the socket to the zygote
   // A lock protecting all communication with the zygote. This lock must be
   // acquired before sending a command and released after the result has been
   // received.
   base::Lock control_lock_;
   pid_t pid_;
   bool init_;
   bool using_suid_sandbox_;
   std::string sandbox_binary_;
   bool have_read_sandbox_status_word_;
   int sandbox_status_;
 };
 
 #endif  // CONTENT_BROWSER_ZYGOTE_HOST_IMPL_LINUX_H_