mirror of
https://github.com/clearlinux/systemd-stable.git
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Lennart Poettering
ab64c275ef
This partially reverts41a55c46abSome specifications we want to stay compatibility actually document /var/run, not /run, and we should stay compatible with that. In order to make sure our D-Bus implementation works on any system, regardless if running systemd or not, we should always use /var/run which is the only path mandated by the D-Bus spec. Similar, glibc hardcodes the utmp location to /var/run, and this is exposed in _UTMP_PATH in limits.h, hence let's stay in sync with this public API, too. We simply do not support systems where /var/run is not a symlink → /run. Hence both are equivalent. Staying compatible with upstream specifications hence weighs more than cleaning up superficial appearance. (cherry picked from commitdf1e020461)
155 lines
5.5 KiB
XML
155 lines
5.5 KiB
XML
<?xml version='1.0'?> <!--*-nxml-*-->
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!--
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This file is part of systemd.
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Copyright 2010 Lennart Poettering
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systemd is free software; you can redistribute it and/or modify it
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under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 2.1 of the License, or
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(at your option) any later version.
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systemd is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with systemd; If not, see <http://www.gnu.org/licenses/>.
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-->
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<refentry id="runlevel"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>runlevel</title>
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<productname>systemd</productname>
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<authorgroup>
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<author>
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<contrib>Developer</contrib>
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<firstname>Lennart</firstname>
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<surname>Poettering</surname>
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<email>lennart@poettering.net</email>
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</author>
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</authorgroup>
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</refentryinfo>
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<refmeta>
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<refentrytitle>runlevel</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>runlevel</refname>
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<refpurpose>Print previous and current SysV runlevel</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<cmdsynopsis>
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<command>runlevel <arg choice="opt" rep="repeat">options</arg></command>
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</cmdsynopsis>
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</refsynopsisdiv>
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<refsect1>
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<title>Description</title>
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<para><command>runlevel</command> prints the previous
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and current SysV runlevel if they are known.</para>
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<para>The two runlevel characters are separated by a
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single space character. If a runlevel cannot be
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determined, N is printed instead. If neither can be
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determined, the word "unknown" is printed.</para>
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<para>Unless overridden in the environment, this will
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check the utmp database for recent runlevel
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changes.</para>
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</refsect1>
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<refsect1>
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<title>Options</title>
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<para>The following option is understood:</para>
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<variablelist>
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<varlistentry>
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<term><option>--help</option></term>
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<xi:include href="standard-options.xml" xpointer="help-text" />
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Exit status</title>
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<para>If one or both runlevels could be determined, 0
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is returned, a non-zero failure code otherwise.</para>
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</refsect1>
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<refsect1>
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<title>Environment</title>
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<variablelist class='environment-variables'>
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<varlistentry>
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<term><varname>$RUNLEVEL</varname></term>
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<listitem><para>If
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<varname>$RUNLEVEL</varname> is set,
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<command>runlevel</command> will print
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this value as current runlevel and
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ignore utmp.</para></listitem>
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</varlistentry>
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<varlistentry>
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<term><varname>$PREVLEVEL</varname></term>
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<listitem><para>If
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<varname>$PREVLEVEL</varname> is set,
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<command>runlevel</command> will print
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this value as previous runlevel and
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ignore utmp.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Files</title>
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<variablelist>
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<varlistentry>
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<term><filename>/var/run/utmp</filename></term>
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<listitem><para>The utmp database
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<command>runlevel</command> reads the
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previous and current runlevel
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from.</para></listitem>
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</varlistentry>
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</variablelist>
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</refsect1>
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<refsect1>
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<title>Notes</title>
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<para>This is a legacy command available for compatibility
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only. It should not be used anymore, as the concept of
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runlevels is obsolete.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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