+++ /dev/null
-<?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. Similarly,
- <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>It is necessary to have this code in a separate binary
- because otherwise rebooting after an upgrade might be broken — the
- running PID 1 could still depend on libraries which are not
- available any more, thus keeping the file system busy, which then
- cannot be re-mounted read-only.</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>
~ianmdlvl / elogind.git / blobdiff