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1 // Copyright 2014 The Chromium Authors. All rights reserved. | |
2 // Use of this source code is governed by a BSD-style license that can be | |
3 // found in the LICENSE file. | |
4 | |
5 #ifndef DEVICE_HID_DEVICE_MONITOR_LINUX_H_ | |
6 #define DEVICE_HID_DEVICE_MONITOR_LINUX_H_ | |
7 | |
8 #include <memory> | |
9 #include <string> | |
10 | |
11 #include "base/compiler_specific.h" | |
12 #include "base/files/file_descriptor_watcher_posix.h" | |
13 #include "base/macros.h" | |
14 #include "base/message_loop/message_loop.h" | |
15 #include "base/observer_list.h" | |
16 #include "base/threading/thread_checker.h" | |
17 #include "device/core/device_core_export.h" | |
18 #include "device/udev_linux/scoped_udev.h" | |
19 | |
20 struct udev_device; | |
21 | |
22 namespace device { | |
23 | |
24 // This class listends for notifications from libudev about | |
25 // connected/disconnected devices. This class is *NOT* thread-safe. | |
26 class DEVICE_CORE_EXPORT DeviceMonitorLinux | |
27 : public base::MessageLoop::DestructionObserver { | |
28 public: | |
29 typedef base::Callback<void(udev_device* device)> EnumerateCallback; | |
30 | |
31 class Observer { | |
32 public: | |
33 virtual ~Observer() {} | |
34 virtual void OnDeviceAdded(udev_device* device) = 0; | |
35 virtual void OnDeviceRemoved(udev_device* device) = 0; | |
36 virtual void WillDestroyMonitorMessageLoop() = 0; | |
37 }; | |
38 | |
39 DeviceMonitorLinux(); | |
40 | |
41 static DeviceMonitorLinux* GetInstance(); | |
42 | |
43 void AddObserver(Observer* observer); | |
44 void RemoveObserver(Observer* observer); | |
45 | |
46 ScopedUdevDevicePtr GetDeviceFromPath(const std::string& path); | |
47 void Enumerate(const EnumerateCallback& callback); | |
48 | |
49 // Implements base::MessageLoop::DestructionObserver | |
50 void WillDestroyCurrentMessageLoop() override; | |
51 | |
52 private: | |
53 friend std::default_delete<DeviceMonitorLinux>; | |
54 | |
55 ~DeviceMonitorLinux() override; | |
56 | |
57 void OnMonitorCanReadWithoutBlocking(); | |
58 | |
59 ScopedUdevPtr udev_; | |
60 ScopedUdevMonitorPtr monitor_; | |
61 int monitor_fd_; | |
62 std::unique_ptr<base::FileDescriptorWatcher::Controller> | |
63 monitor_watch_controller_; | |
64 | |
65 base::ObserverList<Observer, true> observers_; | |
66 | |
67 base::ThreadChecker thread_checker_; | |
68 | |
69 DISALLOW_COPY_AND_ASSIGN(DeviceMonitorLinux); | |
70 }; | |
71 | |
72 } // namespace device | |
73 | |
74 #endif // DEVICE_HID_DEVICE_MONITOR_LINUX_H_ | |
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