OLD | NEW |
(Empty) | |
| 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 CONTENT_BROWSER_TIME_ZONE_MONITOR_H_ |
| 6 #define CONTENT_BROWSER_TIME_ZONE_MONITOR_H_ |
| 7 |
| 8 #include "base/basictypes.h" |
| 9 #include "base/memory/scoped_ptr.h" |
| 10 |
| 11 namespace content { |
| 12 |
| 13 // TimeZoneMonitor watches the system time zone, and notifies renderers |
| 14 // when it changes. Some renderer code caches the system time zone, so |
| 15 // this notification is necessary to inform such code that cached |
| 16 // timezone data may have become invalid. Due to sandboxing, it is not |
| 17 // possible for renderer processes to monitor for system time zone |
| 18 // changes themselves, so this must happen in the browser process. |
| 19 // |
| 20 // Sandboxing also may prevent renderer processes from reading the time |
| 21 // zone when it does change, so platforms may have to deal with this in |
| 22 // platform-specific ways: |
| 23 // - Mac uses a sandbox hole defined in content/renderer/renderer.sb. |
| 24 // - Linux-based platforms use ProxyLocaltimeCallToBrowser in |
| 25 // content/zygote/zygote_main_linux.cc and HandleLocaltime in |
| 26 // content/browser/renderer_host/sandbox_ipc_linux.cc to override |
| 27 // localtime in renderer processes with custom code that calls |
| 28 // localtime in the browser process via Chrome IPC. |
| 29 |
| 30 class TimeZoneMonitor { |
| 31 public: |
| 32 // Returns a new TimeZoneMonitor object (likely a subclass) specific to the |
| 33 // platform. |
| 34 static scoped_ptr<TimeZoneMonitor> Create(); |
| 35 |
| 36 virtual ~TimeZoneMonitor(); |
| 37 |
| 38 protected: |
| 39 TimeZoneMonitor(); |
| 40 |
| 41 // Loop over all renderers and notify them that the system time zone may |
| 42 // have changed. |
| 43 void NotifyRenderers(); |
| 44 |
| 45 private: |
| 46 DISALLOW_COPY_AND_ASSIGN(TimeZoneMonitor); |
| 47 }; |
| 48 |
| 49 } // namespace content |
| 50 |
| 51 #endif // CONTENT_BROWSER_TIME_ZONE_MONITOR_H_ |
OLD | NEW |