New NaCl zygote implementation 2

chrome/common/nacl_fork_delegate_linux.h

+// Copyright (c) 2011 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_COMMON_NACL_FORK_DELEGATE_LINUX_H_
+#define CHROME_COMMON_NACL_FORK_DELEGATE_LINUX_H_
+#pragma once
+
+#if defined(OS_LINUX)

[jam, 2011/06/24 00:10:34]

not needed

[Brad Chen, 2011/06/24 00:40:11]

Done.

+
+#include "base/basictypes.h"
+#include "content/common/zygote_fork_delegate_linux.h"
+
+class NaClForkDelegate : public ZygoteForkDelegate {
+ public:
+  // The NaClForkDelegate is created during Chrome linux zygote
+  // initialization, and provides "fork()" functionality with
+  // NaCl specific process characteristics (specifically address
+  // space layout) as an alternative to forking the zygote.
+  // A new delegate is passed in as an argument to ZygoteMain().
+  NaClForkDelegate();
+  ~NaClForkDelegate();
+
+  // Initialization happens in the zygote after it has been

[jam, 2011/06/24 00:10:34]

nit: no need to duplicate the comments from the interface here

[Brad Chen, 2011/06/24 00:40:11]

Done.

+  // started by ZygoteMain.
+  virtual void Init(const bool sandboxed,
+                    const int browserdesc,
+                    const int sandboxdesc);
+  // Returns 'true' if the delegate would like to handle a given
+  // fork request. Otherwise returns false.
+  virtual bool CanHelp(const std::string& process_type);
+  // Delegate forks, returning a -1 on failure. Outside the
+  // suid sandbox, Fork() returns the Linux process ID. Inside
+  // the sandbox, returns a positive integer, with PID discovery
+  // handled by the sandbox.
+  virtual pid_t Fork(const std::vector<int>& fds);
+  // After a successful for, signal the child to indicate that
+  // the child's PID has been received. Also communicate the
+  // channel switch as a part of acknowledgement message.
+  virtual bool AckChild(const int fd, const std::string& channel_switch);
+
+ private:
+  pid_t Pid() {

[jam, 2011/06/24 00:10:34]

nit: why are there private getters for these member variables?

[Brad Chen, 2011/06/24 00:40:11]

Done.

+    return pid_;
+  };
+  int FD() {
+    return fd_;
+  };
+
+  bool sandboxed_;
+  int fd_;
+  pid_t pid_;
+};
+
+#endif  // OS_LINUX
+#endif  // CHROME_COMMON_NACL_FORK_DELEGATE_LINUX_H_