Linux Sandbox: Basic support for GPU broker.

sandbox/linux/services/broker_process.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 SANDBOX_LINUX_SERVICES_BROKER_PROCESS_H_
 #define SANDBOX_LINUX_SERVICES_BROKER_PROCESS_H_
 
 #include <string>
 #include <vector>
 
 #include "base/basictypes.h"
 #include "base/pickle.h"
 #include "base/process.h"
 
 namespace sandbox {
 
 // Create a new "broker" process to which we can send requests via an IPC
 // channel.
 // This is a low level IPC mechanism that is suitable to be called from a
 // signal handler.
 // A process would typically create a broker process before entering
 // sandboxing.
-// 1. BrokerProcess open_broker(file_whitelist);
+// 1. BrokerProcess open_broker(read_whitelist, write_whitelist);
 // 2. CHECK(open_broker.Init(NULL));
 // 3. Enable sandbox.
 // 4. Use open_broker.Open() to open files.
 class BrokerProcess {
  public:
   // |allowed_file_names| is a white list of files that can be opened later via
   // the Open() API.
   // |fast_check_in_client| and |quiet_failures_for_tests| are reserved for
   // unit tests, don't use it.
   explicit BrokerProcess(const std::vector<std::string>& allowed_r_files_,
                          const std::vector<std::string>& allowed_w_files_,
                          bool fast_check_in_client = true,
                          bool quiet_failures_for_tests = false);
   ~BrokerProcess();
   // Will initialize the broker process. There should be no threads at this
   // point, since we need to fork().
-  // sandbox_callback should be NULL as this feature is not implemented yet.
-  bool Init(void* sandbox_callback);
+  // sandbox_callback is a function that should be called to enable the
+  // sandbox in the broker.
+  bool Init(bool (*sandbox_callback)(void));
 
   // Can be used in place of open(). Will be async signal safe.
   // The implementation only supports certain white listed flags and will
   // return -EPERM on other flags.
   // It's similar to the open() system call and will return -errno on errors.
   int Open(const char* pathname, int flags) const;
 
   int broker_pid() const { return broker_pid_; }
 
  private:
@@ skipping 10 matching lines @@
   pid_t broker_pid_;  // The PID of the broker (child).
   const std::vector<std::string> allowed_r_files_;  // Files allowed for read.
   const std::vector<std::string> allowed_w_files_;  // Files allowed for write.
   int ipc_socketpair_;  // Our communication channel to parent or child.
   DISALLOW_IMPLICIT_CONSTRUCTORS(BrokerProcess);
 };
 
 }  // namespace sandbox
 
 #endif  // SANDBOX_LINUX_SERVICES_BROKER_PROCESS_H_