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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 | ||
96b2fb93 | 8 | Copyright © 2010-2013 Kay Sievers |
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9 | --> |
10 | ||
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11 | <refentry id="systemd-udevd.service" |
12 | xmlns:xi="http://www.w3.org/2001/XInclude"> | |
13 | ||
63749b1a | 14 | <refentryinfo> |
49408357 | 15 | <title>systemd-udevd.service</title> |
d3a2386d KS |
16 | <productname>systemd</productname> |
17 | <authorgroup> | |
18 | <author> | |
19 | <contrib>Developer</contrib> | |
20 | <firstname>Kay</firstname> | |
21 | <surname>Sievers</surname> | |
22 | <email>kay@vrfy.org</email> | |
23 | </author> | |
24 | </authorgroup> | |
63749b1a | 25 | </refentryinfo> |
420a506e | 26 | |
63749b1a | 27 | <refmeta> |
bad1837c | 28 | <refentrytitle>systemd-udevd.service</refentrytitle> |
63749b1a | 29 | <manvolnum>8</manvolnum> |
63749b1a | 30 | </refmeta> |
420a506e | 31 | |
63749b1a | 32 | <refnamediv> |
51dfddc2 CG |
33 | <refname>systemd-udevd.service</refname> |
34 | <refname>systemd-udevd-control.socket</refname> | |
35 | <refname>systemd-udevd-kernel.socket</refname> | |
bad1837c | 36 | <refname>systemd-udevd</refname> |
b79f817b | 37 | <refpurpose>Device event managing daemon</refpurpose> |
63749b1a | 38 | </refnamediv> |
420a506e | 39 | |
63749b1a | 40 | <refsynopsisdiv> |
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41 | <para><filename>systemd-udevd.service</filename></para> |
42 | <para><filename>systemd-udevd-control.socket</filename></para> | |
43 | <para><filename>systemd-udevd-kernel.socket</filename></para> | |
b79f817b | 44 | |
63749b1a | 45 | <cmdsynopsis> |
12b42c76 | 46 | <command>/usr/lib/systemd/systemd-udevd</command> |
63749b1a | 47 | <arg><option>--daemon</option></arg> |
63749b1a | 48 | <arg><option>--debug</option></arg> |
9fa68615 KS |
49 | <arg><option>--children-max=</option></arg> |
50 | <arg><option>--exec-delay=</option></arg> | |
9719859c | 51 | <arg><option>--event-timeout=</option></arg> |
63749b1a | 52 | <arg><option>--resolve-names=early|late|never</option></arg> |
9fa68615 | 53 | <arg><option>--version</option></arg> |
63749b1a KS |
54 | <arg><option>--help</option></arg> |
55 | </cmdsynopsis> | |
b79f817b | 56 | |
63749b1a | 57 | </refsynopsisdiv> |
420a506e | 58 | |
63749b1a | 59 | <refsect1><title>Description</title> |
b8e8f0cb | 60 | <para><command>systemd-udevd</command> listens to kernel uevents. |
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61 | For every event, systemd-udevd executes matching instructions |
62 | specified in udev rules. See <citerefentry> | |
63 | <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum> | |
64 | </citerefentry>.</para> | |
65 | ||
203af57f ZJS |
66 | <para>The behavior of the daemon can be configured using |
67 | <citerefentry><refentrytitle>udev.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
81c7dd89 LP |
68 | its command line options, environment variables, and on the kernel |
69 | command line, or changed dynamically with <command>udevadm | |
203af57f | 70 | control</command>. |
6fc5a404 | 71 | </para> |
63749b1a | 72 | </refsect1> |
420a506e | 73 | |
63749b1a KS |
74 | <refsect1><title>Options</title> |
75 | <variablelist> | |
76 | <varlistentry> | |
a135d271 | 77 | <term><option>-d</option></term> |
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78 | <term><option>--daemon</option></term> |
79 | <listitem> | |
80 | <para>Detach and run in the background.</para> | |
81 | </listitem> | |
82 | </varlistentry> | |
dfdebb1b | 83 | |
63749b1a | 84 | <varlistentry> |
a135d271 | 85 | <term><option>-D</option></term> |
9fa68615 KS |
86 | <term><option>--debug</option></term> |
87 | <listitem> | |
6db27428 | 88 | <para>Print debug messages to standard error.</para> |
9fa68615 KS |
89 | </listitem> |
90 | </varlistentry> | |
dfdebb1b | 91 | |
9fa68615 | 92 | <varlistentry> |
a135d271 | 93 | <term><option>-c=</option></term> |
9fa68615 | 94 | <term><option>--children-max=</option></term> |
63749b1a | 95 | <listitem> |
b8e8f0cb | 96 | <para>Limit the number of events executed in parallel.</para> |
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97 | </listitem> |
98 | </varlistentry> | |
dfdebb1b | 99 | |
63749b1a | 100 | <varlistentry> |
a135d271 | 101 | <term><option>-e=</option></term> |
9fa68615 | 102 | <term><option>--exec-delay=</option></term> |
63749b1a | 103 | <listitem> |
6db27428 | 104 | <para>Delay the execution of <varname>RUN</varname> |
66f756d4 | 105 | instructions by the given number of seconds. This option |
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106 | might be useful when debugging system crashes during |
107 | coldplug caused by loading non-working kernel | |
108 | modules.</para> | |
63749b1a KS |
109 | </listitem> |
110 | </varlistentry> | |
dfdebb1b | 111 | |
9719859c | 112 | <varlistentry> |
a135d271 | 113 | <term><option>-t=</option></term> |
9719859c HR |
114 | <term><option>--event-timeout=</option></term> |
115 | <listitem> | |
dd5eddd2 | 116 | <para>Set the number of seconds to wait for events to finish. After |
b938cb90 | 117 | this time, the event will be terminated. The default is 180 seconds.</para> |
9719859c HR |
118 | </listitem> |
119 | </varlistentry> | |
120 | ||
63749b1a | 121 | <varlistentry> |
a135d271 | 122 | <term><option>-N=</option></term> |
9fa68615 | 123 | <term><option>--resolve-names=</option></term> |
63749b1a | 124 | <listitem> |
f13b388f | 125 | <para>Specify when systemd-udevd should resolve names of users and groups. |
73e231ab | 126 | When set to <option>early</option> (the default), names will be |
63749b1a | 127 | resolved when the rules are parsed. When set to |
73e231ab JE |
128 | <option>late</option>, names will be resolved for every event. |
129 | When set to <option>never</option>, names will never be resolved | |
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130 | and all devices will be owned by root.</para> |
131 | </listitem> | |
132 | </varlistentry> | |
dfdebb1b | 133 | |
a135d271 | 134 | <xi:include href="standard-options.xml" xpointer="help" /> |
dfdebb1b | 135 | <xi:include href="standard-options.xml" xpointer="version" /> |
63749b1a KS |
136 | </variablelist> |
137 | </refsect1> | |
420a506e | 138 | |
8f7f1a2b | 139 | <refsect1><title>Kernel command line</title> |
ccc9a4f9 | 140 | <variablelist class='kernel-commandline-options'> |
b8e8f0cb ZJS |
141 | <para>Parameters starting with "rd." will be read when |
142 | <command>systemd-udevd</command> is used in an initrd.</para> | |
8f7f1a2b | 143 | <varlistentry> |
1d84ad94 LP |
144 | <term><varname>udev.log_priority=</varname></term> |
145 | <term><varname>rd.udev.log_priority=</varname></term> | |
8f7f1a2b | 146 | <listitem> |
f47ad593 | 147 | <para>Set the log level.</para> |
8f7f1a2b KS |
148 | </listitem> |
149 | </varlistentry> | |
150 | <varlistentry> | |
1d84ad94 LP |
151 | <term><varname>udev.children_max=</varname></term> |
152 | <term><varname>rd.udev.children_max=</varname></term> | |
8f7f1a2b | 153 | <listitem> |
b8e8f0cb | 154 | <para>Limit the number of events executed in parallel.</para> |
8f7f1a2b KS |
155 | </listitem> |
156 | </varlistentry> | |
157 | <varlistentry> | |
1d84ad94 LP |
158 | <term><varname>udev.exec_delay=</varname></term> |
159 | <term><varname>rd.udev.exec_delay=</varname></term> | |
8f7f1a2b | 160 | <listitem> |
ed7e5fe3 | 161 | <para>Delay the execution of <varname>RUN</varname> instructions by the given |
b8e8f0cb ZJS |
162 | number of seconds. This option might be useful when |
163 | debugging system crashes during coldplug caused by loading | |
164 | non-working kernel modules.</para> | |
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165 | </listitem> |
166 | </varlistentry> | |
9719859c | 167 | <varlistentry> |
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168 | <term><varname>udev.event_timeout=</varname></term> |
169 | <term><varname>rd.udev.event_timeout=</varname></term> | |
9719859c HR |
170 | <listitem> |
171 | <para>Wait for events to finish up to the given number | |
172 | of seconds. This option might be useful if events are | |
dd5eddd2 | 173 | terminated due to kernel drivers taking too long to initialize.</para> |
9719859c HR |
174 | </listitem> |
175 | </varlistentry> | |
0cf2d0d0 | 176 | <varlistentry> |
5a33334b | 177 | <term><varname>net.ifnames=</varname></term> |
0cf2d0d0 | 178 | <listitem> |
5a33334b | 179 | <para>Network interfaces are renamed to give them predictable names |
bcddd5bf | 180 | when possible. It is enabled by default; specifying 0 disables it.</para> |
0cf2d0d0 TG |
181 | </listitem> |
182 | </varlistentry> | |
63749b1a | 183 | </variablelist> |
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184 | <!-- when adding entries here, consider also adding them |
185 | in kernel-command-line.xml --> | |
63749b1a | 186 | </refsect1> |
7b86ada7 | 187 | |
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188 | <refsect1> |
189 | <title>See Also</title> | |
6fc5a404 ZJS |
190 | <para> |
191 | <citerefentry><refentrytitle>udev.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, | |
192 | <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>, | |
193 | <citerefentry><refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum></citerefentry> | |
194 | </para> | |
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195 | </refsect1> |
196 | </refentry> |