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3802a3d3 | 1 | <?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*--> |
63749b1a | 2 | <!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN" |
12b42c76 | 3 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
420a506e | 4 | |
f48f7543 ZJS |
5 | <!-- |
6 | SPDX-License-Identifier: LGPL-2.1+ | |
7 | ||
8 | This file is part of systemd. | |
9 | ||
10 | Copyright 2010-2013 Kay Sievers | |
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11 | --> |
12 | ||
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13 | <refentry id="systemd-udevd.service" |
14 | xmlns:xi="http://www.w3.org/2001/XInclude"> | |
15 | ||
63749b1a | 16 | <refentryinfo> |
49408357 | 17 | <title>systemd-udevd.service</title> |
d3a2386d KS |
18 | <productname>systemd</productname> |
19 | <authorgroup> | |
20 | <author> | |
21 | <contrib>Developer</contrib> | |
22 | <firstname>Kay</firstname> | |
23 | <surname>Sievers</surname> | |
24 | <email>kay@vrfy.org</email> | |
25 | </author> | |
26 | </authorgroup> | |
63749b1a | 27 | </refentryinfo> |
420a506e | 28 | |
63749b1a | 29 | <refmeta> |
bad1837c | 30 | <refentrytitle>systemd-udevd.service</refentrytitle> |
63749b1a | 31 | <manvolnum>8</manvolnum> |
63749b1a | 32 | </refmeta> |
420a506e | 33 | |
63749b1a | 34 | <refnamediv> |
51dfddc2 CG |
35 | <refname>systemd-udevd.service</refname> |
36 | <refname>systemd-udevd-control.socket</refname> | |
37 | <refname>systemd-udevd-kernel.socket</refname> | |
bad1837c | 38 | <refname>systemd-udevd</refname> |
b79f817b | 39 | <refpurpose>Device event managing daemon</refpurpose> |
63749b1a | 40 | </refnamediv> |
420a506e | 41 | |
63749b1a | 42 | <refsynopsisdiv> |
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43 | <para><filename>systemd-udevd.service</filename></para> |
44 | <para><filename>systemd-udevd-control.socket</filename></para> | |
45 | <para><filename>systemd-udevd-kernel.socket</filename></para> | |
b79f817b | 46 | |
63749b1a | 47 | <cmdsynopsis> |
12b42c76 | 48 | <command>/usr/lib/systemd/systemd-udevd</command> |
63749b1a | 49 | <arg><option>--daemon</option></arg> |
63749b1a | 50 | <arg><option>--debug</option></arg> |
9fa68615 KS |
51 | <arg><option>--children-max=</option></arg> |
52 | <arg><option>--exec-delay=</option></arg> | |
9719859c | 53 | <arg><option>--event-timeout=</option></arg> |
63749b1a | 54 | <arg><option>--resolve-names=early|late|never</option></arg> |
9fa68615 | 55 | <arg><option>--version</option></arg> |
63749b1a KS |
56 | <arg><option>--help</option></arg> |
57 | </cmdsynopsis> | |
b79f817b | 58 | |
63749b1a | 59 | </refsynopsisdiv> |
420a506e | 60 | |
63749b1a | 61 | <refsect1><title>Description</title> |
b8e8f0cb | 62 | <para><command>systemd-udevd</command> listens to kernel uevents. |
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63 | For every event, systemd-udevd executes matching instructions |
64 | specified in udev rules. See <citerefentry> | |
65 | <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum> | |
66 | </citerefentry>.</para> | |
67 | ||
203af57f ZJS |
68 | <para>The behavior of the daemon can be configured using |
69 | <citerefentry><refentrytitle>udev.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
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70 | its command line options, environment variables, and on the kernel |
71 | command line, or changed dynamically with <command>udevadm | |
203af57f | 72 | control</command>. |
6fc5a404 | 73 | </para> |
63749b1a | 74 | </refsect1> |
420a506e | 75 | |
63749b1a KS |
76 | <refsect1><title>Options</title> |
77 | <variablelist> | |
78 | <varlistentry> | |
a135d271 | 79 | <term><option>-d</option></term> |
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80 | <term><option>--daemon</option></term> |
81 | <listitem> | |
82 | <para>Detach and run in the background.</para> | |
83 | </listitem> | |
84 | </varlistentry> | |
dfdebb1b | 85 | |
63749b1a | 86 | <varlistentry> |
a135d271 | 87 | <term><option>-D</option></term> |
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88 | <term><option>--debug</option></term> |
89 | <listitem> | |
6db27428 | 90 | <para>Print debug messages to standard error.</para> |
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91 | </listitem> |
92 | </varlistentry> | |
dfdebb1b | 93 | |
9fa68615 | 94 | <varlistentry> |
a135d271 | 95 | <term><option>-c=</option></term> |
9fa68615 | 96 | <term><option>--children-max=</option></term> |
63749b1a | 97 | <listitem> |
b8e8f0cb | 98 | <para>Limit the number of events executed in parallel.</para> |
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99 | </listitem> |
100 | </varlistentry> | |
dfdebb1b | 101 | |
63749b1a | 102 | <varlistentry> |
a135d271 | 103 | <term><option>-e=</option></term> |
9fa68615 | 104 | <term><option>--exec-delay=</option></term> |
63749b1a | 105 | <listitem> |
6db27428 | 106 | <para>Delay the execution of <varname>RUN</varname> |
66f756d4 | 107 | instructions by the given number of seconds. This option |
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108 | might be useful when debugging system crashes during |
109 | coldplug caused by loading non-working kernel | |
110 | modules.</para> | |
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111 | </listitem> |
112 | </varlistentry> | |
dfdebb1b | 113 | |
9719859c | 114 | <varlistentry> |
a135d271 | 115 | <term><option>-t=</option></term> |
9719859c HR |
116 | <term><option>--event-timeout=</option></term> |
117 | <listitem> | |
dd5eddd2 | 118 | <para>Set the number of seconds to wait for events to finish. After |
b938cb90 | 119 | this time, the event will be terminated. The default is 180 seconds.</para> |
9719859c HR |
120 | </listitem> |
121 | </varlistentry> | |
122 | ||
63749b1a | 123 | <varlistentry> |
a135d271 | 124 | <term><option>-N=</option></term> |
9fa68615 | 125 | <term><option>--resolve-names=</option></term> |
63749b1a | 126 | <listitem> |
f13b388f | 127 | <para>Specify when systemd-udevd should resolve names of users and groups. |
73e231ab | 128 | When set to <option>early</option> (the default), names will be |
63749b1a | 129 | resolved when the rules are parsed. When set to |
73e231ab JE |
130 | <option>late</option>, names will be resolved for every event. |
131 | When set to <option>never</option>, names will never be resolved | |
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132 | and all devices will be owned by root.</para> |
133 | </listitem> | |
134 | </varlistentry> | |
dfdebb1b | 135 | |
a135d271 | 136 | <xi:include href="standard-options.xml" xpointer="help" /> |
dfdebb1b | 137 | <xi:include href="standard-options.xml" xpointer="version" /> |
63749b1a KS |
138 | </variablelist> |
139 | </refsect1> | |
420a506e | 140 | |
8f7f1a2b | 141 | <refsect1><title>Kernel command line</title> |
ccc9a4f9 | 142 | <variablelist class='kernel-commandline-options'> |
b8e8f0cb ZJS |
143 | <para>Parameters starting with "rd." will be read when |
144 | <command>systemd-udevd</command> is used in an initrd.</para> | |
8f7f1a2b | 145 | <varlistentry> |
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146 | <term><varname>udev.log_priority=</varname></term> |
147 | <term><varname>rd.udev.log_priority=</varname></term> | |
8f7f1a2b | 148 | <listitem> |
f47ad593 | 149 | <para>Set the log level.</para> |
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150 | </listitem> |
151 | </varlistentry> | |
152 | <varlistentry> | |
1d84ad94 LP |
153 | <term><varname>udev.children_max=</varname></term> |
154 | <term><varname>rd.udev.children_max=</varname></term> | |
8f7f1a2b | 155 | <listitem> |
b8e8f0cb | 156 | <para>Limit the number of events executed in parallel.</para> |
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157 | </listitem> |
158 | </varlistentry> | |
159 | <varlistentry> | |
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160 | <term><varname>udev.exec_delay=</varname></term> |
161 | <term><varname>rd.udev.exec_delay=</varname></term> | |
8f7f1a2b | 162 | <listitem> |
ed7e5fe3 | 163 | <para>Delay the execution of <varname>RUN</varname> instructions by the given |
b8e8f0cb ZJS |
164 | number of seconds. This option might be useful when |
165 | debugging system crashes during coldplug caused by loading | |
166 | non-working kernel modules.</para> | |
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167 | </listitem> |
168 | </varlistentry> | |
9719859c | 169 | <varlistentry> |
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170 | <term><varname>udev.event_timeout=</varname></term> |
171 | <term><varname>rd.udev.event_timeout=</varname></term> | |
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172 | <listitem> |
173 | <para>Wait for events to finish up to the given number | |
174 | of seconds. This option might be useful if events are | |
dd5eddd2 | 175 | terminated due to kernel drivers taking too long to initialize.</para> |
9719859c HR |
176 | </listitem> |
177 | </varlistentry> | |
0cf2d0d0 | 178 | <varlistentry> |
5a33334b | 179 | <term><varname>net.ifnames=</varname></term> |
0cf2d0d0 | 180 | <listitem> |
5a33334b | 181 | <para>Network interfaces are renamed to give them predictable names |
bcddd5bf | 182 | when possible. It is enabled by default; specifying 0 disables it.</para> |
0cf2d0d0 TG |
183 | </listitem> |
184 | </varlistentry> | |
63749b1a | 185 | </variablelist> |
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186 | <!-- when adding entries here, consider also adding them |
187 | in kernel-command-line.xml --> | |
63749b1a | 188 | </refsect1> |
7b86ada7 | 189 | |
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190 | <refsect1> |
191 | <title>See Also</title> | |
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192 | <para> |
193 | <citerefentry><refentrytitle>udev.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
194 | <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>, | |
195 | <citerefentry><refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
196 | </para> | |
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197 | </refsect1> |
198 | </refentry> |