| // Copyright 2015 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 BASE_PROCESS_PORT_PROVIDER_MAC_H_ |
| #define BASE_PROCESS_PORT_PROVIDER_MAC_H_ |
| |
| #include <mach/mach.h> |
| |
| #include "base/base_export.h" |
| #include "base/macros.h" |
| #include "base/observer_list.h" |
| #include "base/process/process_handle.h" |
| #include "base/synchronization/lock.h" |
| |
| namespace base { |
| |
| // Abstract base class that provides a mapping from ProcessHandle (pid_t) to the |
| // Mach task port. This replicates task_for_pid(), which requires root |
| // privileges. |
| class BASE_EXPORT PortProvider { |
| public: |
| PortProvider(); |
| virtual ~PortProvider(); |
| |
| class Observer { |
| public: |
| virtual ~Observer() {} |
| // Called by the PortProvider to notify observers that the task port was |
| // received for a given process. |
| // No guarantees are made about the thread on which this notification will |
| // be sent. |
| // Observers must not call AddObserver() or RemoveObserver() in this |
| // callback, as doing so will deadlock. |
| virtual void OnReceivedTaskPort(ProcessHandle process) = 0; |
| }; |
| |
| // Returns the mach task port for |process| if possible, or else |
| // |MACH_PORT_NULL|. |
| virtual mach_port_t TaskForPid(ProcessHandle process) const = 0; |
| |
| // Observer interface. |
| void AddObserver(Observer* observer); |
| void RemoveObserver(Observer* observer); |
| |
| protected: |
| // Called by subclasses to send a notification to observers. |
| void NotifyObservers(ProcessHandle process); |
| |
| private: |
| // ObserverList is not thread-safe, so |lock_| ensures consistency of |
| // |observer_list_|. |
| base::Lock lock_; |
| base::ObserverList<Observer>::Unchecked observer_list_; |
| |
| DISALLOW_COPY_AND_ASSIGN(PortProvider); |
| }; |
| |
| } // namespace base |
| |
| #endif // BASE_PROCESS_PORT_PROVIDER_MAC_H_ |