powerd/system/udev_observer.h

// Copyright (c) 2013 The Chromium OS 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 POWER_MANAGER_POWERD_SYSTEM_UDEV_OBSERVER_H_
#define POWER_MANAGER_POWERD_SYSTEM_UDEV_OBSERVER_H_

#include <string>

namespace power_manager {
namespace system {

// Interface for receiving notification of udev events from UdevInterface.
class UdevObserver {
 public:
  // Action described in a udev event.
  enum Action {
    ACTION_ADD = 0,
    ACTION_REMOVE,
    ACTION_CHANGE,
    ACTION_ONLINE,
    ACTION_OFFLINE,
    ACTION_UNKNOWN,
  };

  virtual ~UdevObserver() {}

  // Called when an event has been received from an observed subsystem.
  virtual void OnUdevEvent(const std::string& subsystem,
                           const std::string& sysname,
                           Action action) = 0;
};

}  // namespace system
}  // namespace power_manager

#endif  // POWER_MANAGER_POWERD_SYSTEM_UDEV_OBSERVER_H_