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// Copyright 2014 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 CONTENT_BROWSER_TIME_ZONE_MONITOR_H_
#define CONTENT_BROWSER_TIME_ZONE_MONITOR_H_
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
namespace content {
// TimeZoneMonitor watches the system time zone, and notifies renderers
// when it changes. Some renderer code caches the system time zone, so
// this notification is necessary to inform such code that cached
// timezone data may have become invalid. Due to sandboxing, it is not
// possible for renderer processes to monitor for system time zone
// changes themselves, so this must happen in the browser process.
//
// Sandboxing also may prevent renderer processes from reading the time
// zone when it does change, so platforms may have to deal with this in
// platform-specific ways:
// - Mac uses a sandbox hole defined in content/renderer/renderer.sb.
// - Linux-based platforms use ProxyLocaltimeCallToBrowser in
// content/zygote/zygote_main_linux.cc and HandleLocaltime in
// content/browser/renderer_host/sandbox_ipc_linux.cc to override
// localtime in renderer processes with custom code that calls
// localtime in the browser process via Chrome IPC.
class TimeZoneMonitor {
public:
// Returns a new TimeZoneMonitor object (likely a subclass) specific to the
// platform.
static scoped_ptr<TimeZoneMonitor> Create();
virtual ~TimeZoneMonitor();
protected:
TimeZoneMonitor();
// Loop over all renderers and notify them that the system time zone may
// have changed.
void NotifyRenderers();
private:
DISALLOW_COPY_AND_ASSIGN(TimeZoneMonitor);
};
} // namespace content
#endif // CONTENT_BROWSER_TIME_ZONE_MONITOR_H_
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