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-<?xml version='1.0'?> <!--*-nxml-*-->
-<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
- "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
-
-<!--
- This file is part of systemd.
-
- Copyright 2012 Lennart Poettering
-
- systemd is free software; you can redistribute it and/or modify it
- under the terms of the GNU Lesser General Public License as published by
- the Free Software Foundation; either version 2.1 of the License, or
- (at your option) any later version.
-
- systemd is distributed in the hope that it will be useful, but
- WITHOUT ANY WARRANTY; without even the implied warranty of
- MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- Lesser General Public License for more details.
-
- You should have received a copy of the GNU Lesser General Public License
- along with systemd; If not, see <http://www.gnu.org/licenses/>.
--->
-
-<refentry id="systemd-halt.service">
-
- <refentryinfo>
- <title>systemd-halt.service</title>
- <productname>systemd</productname>
-
- <authorgroup>
- <author>
- <contrib>Developer</contrib>
- <firstname>Lennart</firstname>
- <surname>Poettering</surname>
- <email>lennart@poettering.net</email>
- </author>
- </authorgroup>
- </refentryinfo>
-
- <refmeta>
- <refentrytitle>systemd-halt.service</refentrytitle>
- <manvolnum>8</manvolnum>
- </refmeta>
-
- <refnamediv>
- <refname>systemd-halt.service</refname>
- <refname>systemd-poweroff.service</refname>
- <refname>systemd-reboot.service</refname>
- <refname>systemd-kexec.service</refname>
- <refname>systemd-shutdown</refname>
- <refpurpose>System shutdown logic</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <para><filename>systemd-halt.service</filename></para>
- <para><filename>systemd-poweroff.service</filename></para>
- <para><filename>systemd-reboot.service</filename></para>
- <para><filename>systemd-kexec.service</filename></para>
- <para><filename>/usr/lib/systemd/systemd-shutdown</filename></para>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Description</title>
-
- <para><filename>systemd-halt.service</filename> is a
- system service that is pulled in by
- <filename>halt.target</filename> and is responsible
- for the actual system halt. Similar,
- <filename>systemd-poweroff.service</filename> is
- pulled in by <filename>poweroff.target</filename>,
- <filename>systemd-reboot.service</filename> by
- <filename>reboot.target</filename> and
- <filename>systemd-kexec.service</filename> by
- <filename>kexec.target</filename> to execute the
- respective actions.</para>
-
- <para>When these services are run they ensure that PID
- 1 is replaced by the
- <filename>/usr/lib/systemd/systemd-shutdown</filename>
- tool which is then responsible for the actual
- shutdown. Before shutting down this binary will try to
- unmount all remaining file systems, disable all
- remaining swap devices, detach all remaining storage
- devices and kill all remaining processes.</para>
-
- <para>Immediately before executing the actual system
- halt/poweroff/reboot/kexec
- <filename>systemd-shutdown</filename> will run all
- executables in
- <filename>/usr/lib/systemd/system-shutdown/</filename>
- and pass one arguments to them: either
- "<literal>halt</literal>",
- "<literal>poweroff</literal>",
- "<literal>reboot</literal>" or
- "<literal>kexec</literal>", depending on the chosen
- action. All executables in this directory are executed
- in parallel, and execution of the action is not
- continued before all executables finished.</para>
-
- <para>Note that
- <filename>systemd-halt.service</filename> (and the
- related units) should never be executed
- directly. Instead, trigger system shutdown with a
- command such as "<literal>systemctl halt</literal>" or
- suchlike.</para>
- </refsect1>
-
- <refsect1>
- <title>See Also</title>
- <para>
- <citerefentry><refentrytitle>systemd</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemctl</refentrytitle><manvolnum>1</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd.special</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>reboot</refentrytitle><manvolnum>2</manvolnum></citerefentry>,
- <citerefentry><refentrytitle>systemd-suspend.service</refentrytitle><manvolnum>8</manvolnum></citerefentry>
- </para>
- </refsect1>
-
-</refentry>