Commit eec575d8 authored by Lennart Poettering's avatar Lennart Poettering
Browse files

man: document device units

parent da49e9ab
......@@ -324,6 +324,7 @@ MANPAGES = \
man/systemd.timer.5 \
man/systemd.path.5 \
man/ \
man/systemd.device.5 \
man/daemon.7 \
man/sd-daemon.7 \
man/runlevel.8 \
<?xml version='1.0'?> <!--*-nxml-*-->
<?xml-stylesheet type="text/xsl" href=""?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
This file is part of systemd.
Copyright 2010 Lennart Poettering
systemd is free software; you can redistribute it and/or modify it
under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 2 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
General Public License for more details.
You should have received a copy of the GNU General Public License
along with systemd; If not, see <>.
<refentry id="systemd.device">
<refpurpose>systemd device configuration files</refpurpose>
<para>A unit configuration file whose name ends in
<filename>.device</filename> encodes information about
a device unit as exposed in the
device tree.</para>
<para>This unit type has no specific options. See
for the common options of all unit configuration
files. The common configuration items are configured
in the generic [Unit] and [Install] sections. A
seperate [Device] section does not exist, since no
device-specific options may be configured.</para>
<para>systemd will automatically create dynamic device
units for all kernel devices that are marked with the
"systemd" udev tag (by default all block and network
devices, and a few others). This may be used to define
dependencies between devices and other
<para>Device units are named after the
<filename>/sys</filename> and
<filename>/dev</filename> paths they control. Example:
the device <filename>/dev/sda5</filename> is exposed
in systemd as <filename>dev-sda5.device</filename>. For
details about the escaping logic used to convert a
file system path to a unit name see
<title>The udev Database</title>
<para>The settings of device units may either be
configured via unit files, or directly from the udev
database (which is recommended). The following udev
properties are understood by systemd:</para>
<listitem><para>Adds dependencies of
type <varname>Wants</varname> from
this unit to all listed units. This
may be used to activate aritrary units
if a specific device becomes
<listitem><para>Adds an additional
alias name to the device unit. This
must be an absolute path that is
automatically transformed into a unit
name. (See above.)</para></listitem>
<listitem><para>If set, this property is
used as description string for the
device unit.</para></listitem>
<title>See Also</title>
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