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577efcdc32
This creates platform-dependent monitors to detect when the system time zone changes. On Linux, we use a file watcher to monitor files such as /etc/localtime for changes. On macOS, this uses CFNotificationCenter to be notified by the OS when the time zone changes. Note: the macOS implementation requires running in a process which is running the CoreFoundation event loop. Both the AppKit and Qt chromes are doing so in the UI process, but this means we cannot run this monitor in the WebContent process.
62 lines
1.7 KiB
C++
62 lines
1.7 KiB
C++
/*
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* Copyright (c) 2024, Tim Flynn <trflynn89@serenityos.org>
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*
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* SPDX-License-Identifier: BSD-2-Clause
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*/
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#include <AK/Platform.h>
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#include <LibCore/FileWatcher.h>
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#include <LibCore/TimeZoneWatcher.h>
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#if !defined(AK_OS_LINUX)
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static_assert(false, "This file must only be used for Linux");
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#endif
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namespace Core {
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static constexpr auto time_zone_files = Array {
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"/etc/localtime"sv,
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"/etc/timezone"sv,
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"/etc/TZ"sv,
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};
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static constexpr auto time_zone_mask = FileWatcherEvent::Type::ContentModified
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| FileWatcherEvent::Type::Deleted
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| FileWatcherEvent::Type::DoNotFollowLink;
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class TimeZoneWatcherImpl final : public TimeZoneWatcher {
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public:
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static ErrorOr<NonnullOwnPtr<TimeZoneWatcherImpl>> create()
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{
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auto file_watcher = TRY(FileWatcher::create());
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for (auto time_zone_file : time_zone_files) {
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if (auto result = file_watcher->add_watch(time_zone_file, time_zone_mask); !result.is_error())
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break;
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}
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return adopt_own(*new TimeZoneWatcherImpl(move(file_watcher)));
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}
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private:
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explicit TimeZoneWatcherImpl(NonnullRefPtr<FileWatcher> file_watcher)
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: m_file_watcher(move(file_watcher))
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{
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m_file_watcher->on_change = [this](Core::FileWatcherEvent const& event) {
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if (on_time_zone_changed)
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on_time_zone_changed();
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if (has_flag(event.type, FileWatcherEvent::Type::Deleted))
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(void)m_file_watcher->add_watch(event.event_path, time_zone_mask);
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};
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}
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NonnullRefPtr<FileWatcher> m_file_watcher;
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};
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ErrorOr<NonnullOwnPtr<TimeZoneWatcher>> TimeZoneWatcher::create()
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{
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return TimeZoneWatcherImpl::create();
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}
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}
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