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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-10 20:49:52 +0000
commit55944e5e40b1be2afc4855d8d2baf4b73d1876b5 (patch)
tree33f869f55a1b149e9b7c2b7e201867ca5dd52992 /man/org.freedesktop.timedate1.xml
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Adding upstream version 255.4.upstream/255.4
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
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+<?xml version='1.0'?>
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" >
+<!-- SPDX-License-Identifier: LGPL-2.1-or-later -->
+
+<refentry id="org.freedesktop.timedate1" conditional='ENABLE_TIMEDATED'
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+ <refentryinfo>
+ <title>org.freedesktop.timedate1</title>
+ <productname>systemd</productname>
+ </refentryinfo>
+
+ <refmeta>
+ <refentrytitle>org.freedesktop.timedate1</refentrytitle>
+ <manvolnum>5</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>org.freedesktop.timedate1</refname>
+ <refpurpose>The D-Bus interface of systemd-timedated</refpurpose>
+ </refnamediv>
+
+ <refsect1>
+ <title>Introduction</title>
+
+ <para>
+ <citerefentry><refentrytitle>systemd-timedated.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ is a system service that can be used to control the system time and related settings. This page
+ describes the D-Bus interface.</para>
+ </refsect1>
+
+ <refsect1>
+ <title>The D-Bus API</title>
+
+ <para>The service exposes the following interfaces on the bus:</para>
+
+ <programlisting executable="systemd-timedated" node="/org/freedesktop/timedate1" interface="org.freedesktop.timedate1">
+node /org/freedesktop/timedate1 {
+ interface org.freedesktop.timedate1 {
+ methods:
+ SetTime(in x usec_utc,
+ in b relative,
+ in b interactive);
+ SetTimezone(in s timezone,
+ in b interactive);
+ SetLocalRTC(in b local_rtc,
+ in b fix_system,
+ in b interactive);
+ SetNTP(in b use_ntp,
+ in b interactive);
+ ListTimezones(out as timezones);
+ properties:
+ readonly s Timezone = '...';
+ readonly b LocalRTC = ...;
+ @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
+ readonly b CanNTP = ...;
+ readonly b NTP = ...;
+ @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
+ readonly b NTPSynchronized = ...;
+ @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
+ readonly t TimeUSec = ...;
+ @org.freedesktop.DBus.Property.EmitsChangedSignal("false")
+ readonly t RTCTimeUSec = ...;
+ };
+ interface org.freedesktop.DBus.Peer { ... };
+ interface org.freedesktop.DBus.Introspectable { ... };
+ interface org.freedesktop.DBus.Properties { ... };
+};
+ </programlisting>
+
+ <!--Autogenerated cross-references for systemd.directives, do not edit-->
+
+ <variablelist class="dbus-interface" generated="True" extra-ref="org.freedesktop.timedate1"/>
+
+ <variablelist class="dbus-interface" generated="True" extra-ref="org.freedesktop.timedate1"/>
+
+ <variablelist class="dbus-method" generated="True" extra-ref="SetTime()"/>
+
+ <variablelist class="dbus-method" generated="True" extra-ref="SetTimezone()"/>
+
+ <variablelist class="dbus-method" generated="True" extra-ref="SetLocalRTC()"/>
+
+ <variablelist class="dbus-method" generated="True" extra-ref="SetNTP()"/>
+
+ <variablelist class="dbus-method" generated="True" extra-ref="ListTimezones()"/>
+
+ <variablelist class="dbus-property" generated="True" extra-ref="Timezone"/>
+
+ <variablelist class="dbus-property" generated="True" extra-ref="LocalRTC"/>
+
+ <variablelist class="dbus-property" generated="True" extra-ref="CanNTP"/>
+
+ <variablelist class="dbus-property" generated="True" extra-ref="NTP"/>
+
+ <variablelist class="dbus-property" generated="True" extra-ref="NTPSynchronized"/>
+
+ <variablelist class="dbus-property" generated="True" extra-ref="TimeUSec"/>
+
+ <variablelist class="dbus-property" generated="True" extra-ref="RTCTimeUSec"/>
+
+ <!--End of Autogenerated section-->
+
+ <refsect2>
+ <title>Methods</title>
+
+ <para>Use <function>SetTime()</function> to change the system clock. Pass a value of microseconds since
+ the UNIX epoch (1 Jan 1970 UTC). If <varname>relative</varname> is true, the passed usec value will be
+ added to the current system time. If it is false, the current system time will be set to the passed usec
+ value. If the system time is set with this method, the RTC will be updated as well.</para>
+
+ <para>Use <function>SetTimezone()</function> to set the system timezone. Pass a value like
+ <literal>Europe/Berlin</literal> to set the timezone. Valid timezones are listed in
+ <filename>/usr/share/zoneinfo/zone.tab</filename>. If the RTC is configured to be maintained in local
+ time, it will be updated accordingly.</para>
+
+ <para>Use <function>SetLocalRTC()</function> to control whether the RTC is in local time or UTC. It is
+ strongly recommended to maintain the RTC in UTC. However, some OSes (Windows) maintain the RTC in local
+ time, which might make it necessary to enable this feature. Note that this might create various problems as
+ daylight changes could be missed. If <varname>fix_system</varname> is <literal>true</literal>,
+ the time from the RTC is read again and the system clock is adjusted according to the new setting. If
+ <varname>fix_system</varname> is <literal>false</literal>, the system time is written to the RTC
+ taking the new setting into account. Use <varname>fix_system=true</varname> in installers and livecds
+ where the RTC is probably more reliable than the system time. Use <varname>fix_system=false</varname>
+ in configuration UIs that are run during normal operation and where the system clock is probably more
+ reliable than the RTC.</para>
+
+ <para>Use <function>SetNTP()</function> to control whether the system clock is synchronized with the
+ network using <filename>systemd-timesyncd</filename>. This will enable and start or disable and stop
+ the chosen time synchronization service.</para>
+
+ <para><function>ListTimezones()</function> returns a list of time zones known on the local system as an
+ array of names (<literal>["Africa/Abidjan", "Africa/Accra", ..., "UTC"]</literal>).</para>
+ </refsect2>
+
+ <refsect2>
+ <title>Properties</title>
+
+ <para><varname>Timezone</varname> shows the currently configured time zone.
+ <varname>LocalRTC</varname> shows whether the RTC is configured to use UTC (false), or the local time
+ zone (true). <varname>CanNTP</varname> shows whether a service to perform time synchronization over the
+ network is available, and <varname>NTP</varname> shows whether such a service is enabled.</para>
+
+ <para><varname>NTPSynchronized</varname> shows whether the kernel reports the time as synchronized
+ (c.f.
+ <citerefentry project="man-pages"><refentrytitle>adjtimex</refentrytitle><manvolnum>3</manvolnum></citerefentry>).
+ <varname>TimeUSec</varname> and <varname>RTCTimeUSec</varname> show the current time on the system and
+ in the RTC. The purpose of those three properties is to allow remote clients to access this information
+ over D-Bus. Local clients can access the information directly.</para>
+
+ <para>Whenever the <varname>Timezone</varname> and <varname>LocalRTC</varname> settings are changed via
+ the daemon, <function>PropertyChanged</function> signals are sent out to which clients can subscribe.
+ </para>
+
+ <para>Note that this service will not inform you about system time changes. Use
+ <citerefentry project="man-pages"><refentrytitle>timerfd</refentrytitle><manvolnum>3</manvolnum></citerefentry>
+ with <constant>CLOCK_REALTIME</constant> and <constant>TFD_TIMER_CANCEL_ON_SET</constant> for that.
+ </para>
+ </refsect2>
+
+ <refsect2>
+ <title>Security</title>
+
+ <para>The <varname>interactive</varname> boolean parameters can be used to control whether
+ <ulink url="https://www.freedesktop.org/software/polkit/docs/latest/">polkit</ulink>
+ should interactively ask the user for authentication credentials if required.</para>
+
+ <para>The polkit action for <function>SetTimezone()</function> is
+ <interfacename>org.freedesktop.timedate1.set-timezone</interfacename>. For
+ <function>SetLocalRTC()</function> it is
+ <interfacename>org.freedesktop.timedate1.set-local-rtc</interfacename>, for
+ <function>SetTime()</function> it is <interfacename>org.freedesktop.timedate1.set-time</interfacename>
+ and for <function>SetNTP()</function> it is
+ <interfacename>org.freedesktop.timedate1.set-ntp</interfacename>.
+ <function>ListTimezones()</function> does not require any privileges.
+ </para>
+ </refsect2>
+ </refsect1>
+
+ <refsect1>
+ <title>Examples</title>
+
+ <example>
+ <title>Introspect <interfacename>org.freedesktop.timedate1</interfacename> on the bus</title>
+
+ <programlisting>
+$ gdbus introspect --system \
+ --dest org.freedesktop.timedate1 \
+ --object-path /org/freedesktop/timedate1
+ </programlisting>
+ </example>
+ </refsect1>
+
+ <xi:include href="org.freedesktop.locale1.xml" xpointer="versioning"/>
+
+ <refsect1>
+ <title>See also</title>
+
+ <para><ulink url="https://lists.freedesktop.org/archives/systemd-devel/2011-May/002526.html">More information on how the system clock and RTC interact</ulink></para>
+ </refsect1>
+</refentry>