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man: drop references to the --priviliged command line option which has been removed...
[elogind.git] / man / systemd-udevd.service.xml
1 <?xml version='1.0'?>
2 <?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
3 <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
4   "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
5
6 <refentry id="systemd-udevd.service"
7           xmlns:xi="http://www.w3.org/2001/XInclude">
8
9   <refentryinfo>
10     <title>systemd-udevd.service</title>
11     <productname>systemd</productname>
12     <authorgroup>
13       <author>
14         <contrib>Developer</contrib>
15         <firstname>Kay</firstname>
16         <surname>Sievers</surname>
17         <email>kay@vrfy.org</email>
18       </author>
19     </authorgroup>
20   </refentryinfo>
21
22   <refmeta>
23     <refentrytitle>systemd-udevd.service</refentrytitle>
24     <manvolnum>8</manvolnum>
25     <refmiscinfo class="version"></refmiscinfo>
26   </refmeta>
27
28   <refnamediv>
29     <refname>systemd-udevd.service</refname>
30     <refname>systemd-udevd-control.socket</refname>
31     <refname>systemd-udevd-kernel.socket</refname>
32     <refname>systemd-udevd</refname>
33     <refpurpose>Device event managing daemon</refpurpose>
34   </refnamediv>
35
36   <refsynopsisdiv>
37     <para><filename>systemd-udevd.service</filename></para>
38     <para><filename>systemd-udevd-control.socket</filename></para>
39     <para><filename>systemd-udevd-kernel.socket</filename></para>
40
41     <cmdsynopsis>
42       <command>/usr/lib/systemd/systemd-udevd</command>
43       <arg><option>--daemon</option></arg>
44       <arg><option>--debug</option></arg>
45       <arg><option>--children-max=</option></arg>
46       <arg><option>--exec-delay=</option></arg>
47       <arg><option>--resolve-names=early|late|never</option></arg>
48       <arg><option>--version</option></arg>
49       <arg><option>--help</option></arg>
50     </cmdsynopsis>
51
52   </refsynopsisdiv>
53
54   <refsect1><title>Description</title>
55     <para><command>systemd-udevd</command> listens to kernel uevents.
56       For every event, systemd-udevd executes matching instructions
57       specified in udev rules. See <citerefentry>
58       <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum>
59       </citerefentry>.</para>
60     <para>The behavior of the running daemon can be changed with
61     <command>udevadm control</command>.</para>
62   </refsect1>
63
64   <refsect1><title>Options</title>
65     <variablelist>
66       <varlistentry>
67         <term><option>--daemon</option></term>
68         <listitem>
69           <para>Detach and run in the background.</para>
70         </listitem>
71       </varlistentry>
72
73       <varlistentry>
74         <term><option>--debug</option></term>
75         <listitem>
76           <para>Print debug messages to standard error.</para>
77         </listitem>
78       </varlistentry>
79
80       <varlistentry>
81         <term><option>--children-max=</option></term>
82         <listitem>
83           <para>Limit the number of events executed in parallel.</para>
84         </listitem>
85       </varlistentry>
86
87       <varlistentry>
88         <term><option>--exec-delay=</option></term>
89         <listitem>
90           <para>Delay the execution of <varname>RUN</varname>
91           instructions by the given number of seconds. This option
92           might be useful when debugging system crashes during
93           coldplug caused by loading non-working kernel
94           modules.</para>
95         </listitem>
96       </varlistentry>
97
98       <varlistentry>
99         <term><option>--resolve-names=</option></term>
100         <listitem>
101           <para>Specify when systemd-udevd should resolve names of users and groups.
102           When set to <option>early</option> (the default), names will be
103           resolved when the rules are parsed.  When set to
104           <option>late</option>, names will be resolved for every event.
105           When set to <option>never</option>, names will never be resolved
106           and all devices will be owned by root.</para>
107         </listitem>
108       </varlistentry>
109
110       <varlistentry>
111         <term><option>--help</option></term>
112
113         <xi:include href="standard-options.xml" xpointer="help-text" />
114       </varlistentry>
115       <xi:include href="standard-options.xml" xpointer="version" />
116     </variablelist>
117   </refsect1>
118
119   <refsect1><title>Environment</title>
120     <variablelist class='environment-variables'>
121       <varlistentry>
122         <term><varname>$UDEV_LOG=</varname></term>
123         <listitem>
124           <para>Set the logging priority.</para>
125         </listitem>
126       </varlistentry>
127     </variablelist>
128  </refsect1>
129
130   <refsect1><title>Kernel command line</title>
131     <variablelist class='kernel-commandline-options'>
132       <para>Parameters starting with "rd." will be read when
133       <command>systemd-udevd</command> is used in an initrd.</para>
134       <varlistentry>
135         <term><varname>udev.log-priority=</varname></term>
136         <term><varname>rd.udev.log-priority=</varname></term>
137         <listitem>
138           <para>Set the logging priority.</para>
139         </listitem>
140       </varlistentry>
141       <varlistentry>
142         <term><varname>udev.children-max=</varname></term>
143         <term><varname>rd.udev.children-max=</varname></term>
144         <listitem>
145           <para>Limit the number of events executed in parallel.</para>
146         </listitem>
147       </varlistentry>
148       <varlistentry>
149         <term><varname>udev.exec-delay=</varname></term>
150         <term><varname>rd.udev.exec-delay=</varname></term>
151         <listitem>
152           <para>Delay the execution of <varname>RUN</varname> instructions by the given
153           number of seconds. This option might be useful when
154           debugging system crashes during coldplug caused by loading
155           non-working kernel modules.</para>
156         </listitem>
157       </varlistentry>
158       <varlistentry>
159         <term><varname>net.ifnames=</varname></term>
160         <listitem>
161           <para>Network interfaces are renamed to give them predictable names
162           when possible. It is enabled by default; specifying 0 disables it.</para>
163         </listitem>
164       </varlistentry>
165     </variablelist>
166     <!-- when adding entries here, consider also adding them
167          in kernel-command-line.xml -->
168  </refsect1>
169
170  <refsect1><title>Configuration file</title>
171    <para>udev expects its main configuration file at <filename>/etc/udev/udev.conf</filename>.
172    It consists of a set of variables allowing the user to override default udev values. All
173    empty lines or lines beginning with '#' are ignored. The following variables can be
174    set:</para>
175    <variablelist>
176      <varlistentry>
177        <term><varname>udev_log</varname></term>
178        <listitem>
179          <para>The logging priority. Valid values are the numerical syslog priorities
180          or their textual representations: <option>err</option>, <option>info</option>
181          and <option>debug</option>.</para>
182        </listitem>
183      </varlistentry>
184    </variablelist>
185  </refsect1>
186
187   <refsect1>
188     <title>See Also</title>
189     <para><citerefentry>
190         <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum>
191       </citerefentry>, <citerefentry>
192         <refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum>
193     </citerefentry></para>
194   </refsect1>
195 </refentry>