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1a0e562a5b
I'm not sure if the LogTarget property is sufficiently general to be made into a property that can be generally implemented. It is very closely tied to the internal systemd logic. The other two seem fine thoough.
107 lines
4.8 KiB
XML
107 lines
4.8 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd" >
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<!-- SPDX-License-Identifier: LGPL-2.1+ -->
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<refentry id="org.freedesktop.LogControl1"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>org.freedesktop.LogControl1</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>org.freedesktop.LogControl1</refentrytitle>
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<manvolnum>5</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>org.freedesktop.LogControl1</refname>
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<refpurpose>D-Bus interface to query and set logging configuration</refpurpose>
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</refnamediv>
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<refsect1>
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<title>Introduction</title>
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<para><interfacename>org.freedesktop.LogControl1</interfacename> is a generic interface that is intended
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to be used by any daemon which should allow setting the log level and target over D-Bus. It is implemented
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by various daemons that are part of the
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry> suite.</para>
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<para>It is assumed that those settings are global for the whole program, so a fixed object path is
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used. The interface should always be available under the path
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<filename>/org/freedesktop/LogControl1</filename>.</para>
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</refsect1>
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<refsect1>
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<title>Description</title>
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<para>The following interface is exposed:</para>
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<programlisting executable="systemd" node="/org/freedesktop/LogControl1" interface="org.freedesktop.LogControl1">
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node /org/freedesktop/LogControl1 {
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interface org.freedesktop.LogControl1 {
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properties:
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@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
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@org.freedesktop.systemd1.Privileged("true")
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readwrite s LogLevel = '...';
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@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
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@org.freedesktop.systemd1.Privileged("true")
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readwrite s LogTarget = '...';
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@org.freedesktop.DBus.Property.EmitsChangedSignal("false")
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readonly s SyslogIdentifier = '...';
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};
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interface org.freedesktop.DBus.Peer { ... };
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interface org.freedesktop.DBus.Introspectable { ... };
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interface org.freedesktop.DBus.Properties { ... };
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};
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</programlisting>
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<!--Autogenerated cross-references for systemd.directives, do not edit-->
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<variablelist class="dbus-interface" generated="True" extra-ref="org.freedesktop.LogControl1"/>
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<variablelist class="dbus-interface" generated="True" extra-ref="org.freedesktop.LogControl1"/>
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<variablelist class="dbus-property" generated="True" extra-ref="LogLevel"/>
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<variablelist class="dbus-property" generated="True" extra-ref="LogTarget"/>
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<variablelist class="dbus-property" generated="True" extra-ref="SyslogIdentifier"/>
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<!--End of Autogenerated section-->
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<refsect2>
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<title>Properties</title>
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<para><varname>LogLevel</varname> describes the
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<citerefentry><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry>-style
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log-level, and should be one of <literal>emerg</literal>, <literal>alert</literal>,
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<literal>crit</literal>, <literal>err</literal>, <literal>warning</literal>, <literal>notice</literal>,
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<literal>info</literal>, <literal>debug</literal>, in order of increasing verbosity.</para>
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<para><varname>LogTarget</varname> describes the log target (mechanism). It should be one of
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<literal>console</literal> (log to the console or standard output),
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<literal>kmsg</literal> (log to the kernel ring buffer),
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<literal>journal</literal> (log the the journal natively, see
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<citerefentry><refentrytitle>systemd-journald.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>),
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<literal>syslog</literal> (log using the
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<citerefentry><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry> call).
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</para>
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<para>Those two properties are writable, so they may be set by sufficiently privileged users.</para>
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<para><varname>SyslogIdentifier</varname> is a read-only property that shows the "syslog identifier".
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It is a short string that identifies the program that is the source of log messages that is passed to
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the <citerefentry><refentrytitle>syslog</refentrytitle><manvolnum>3</manvolnum></citerefentry> call.
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</para>
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<para>Note: <command>journalctl</command> option <option>-p</option>/<option>--priority=</option> may
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be used to filter log messages by log level, option <option>-t</option>/<option>--identifier=</option>
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may be used to by the syslog identifier, and filters like <literal>_TRANSPORT=syslog</literal>,
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<literal>_TRANSPORT=journal</literal>, and <literal>_TRANSPORT=kernel</literal> may be used to filter
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messages by the mechanism through which they reached <command>systemd-journald</command>.</para>
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</refsect2>
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</refsect1>
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</refentry>
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