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420a506e | 1 | <?xml version='1.0'?> |
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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" | |
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4 | "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> |
5 | ||
51dfddc2 | 6 | <refentry id="systemd-udevd.service"> |
63749b1a | 7 | <refentryinfo> |
49408357 | 8 | <title>systemd-udevd.service</title> |
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9 | <productname>systemd</productname> |
10 | <authorgroup> | |
11 | <author> | |
12 | <contrib>Developer</contrib> | |
13 | <firstname>Kay</firstname> | |
14 | <surname>Sievers</surname> | |
15 | <email>kay@vrfy.org</email> | |
16 | </author> | |
17 | </authorgroup> | |
63749b1a | 18 | </refentryinfo> |
420a506e | 19 | |
63749b1a | 20 | <refmeta> |
51dfddc2 | 21 | <refentrytitle>systemd-udevd.service</refentrytitle> |
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22 | <manvolnum>8</manvolnum> |
23 | <refmiscinfo class="version"></refmiscinfo> | |
24 | </refmeta> | |
420a506e | 25 | |
63749b1a | 26 | <refnamediv> |
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27 | <refname>systemd-udevd.service</refname> |
28 | <refname>systemd-udevd-control.socket</refname> | |
29 | <refname>systemd-udevd-kernel.socket</refname> | |
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30 | <refname>systemd-udevd</refname> |
31 | <refpurpose>Device event managing daemon</refpurpose> | |
63749b1a | 32 | </refnamediv> |
420a506e | 33 | |
63749b1a | 34 | <refsynopsisdiv> |
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35 | <para><filename>systemd-udevd.service</filename></para> |
36 | <para><filename>systemd-udevd-control.socket</filename></para> | |
37 | <para><filename>systemd-udevd-kernel.socket</filename></para> | |
b79f817b | 38 | |
63749b1a | 39 | <cmdsynopsis> |
b79f817b | 40 | <command>/usr/lib/systemd/systemd-udevd</command> |
63749b1a | 41 | <arg><option>--daemon</option></arg> |
63749b1a | 42 | <arg><option>--debug</option></arg> |
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43 | <arg><option>--children-max=</option></arg> |
44 | <arg><option>--exec-delay=</option></arg> | |
63749b1a | 45 | <arg><option>--resolve-names=early|late|never</option></arg> |
9fa68615 | 46 | <arg><option>--version</option></arg> |
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47 | <arg><option>--help</option></arg> |
48 | </cmdsynopsis> | |
b79f817b | 49 | |
63749b1a | 50 | </refsynopsisdiv> |
420a506e | 51 | |
63749b1a | 52 | <refsect1><title>Description</title> |
f13b388f | 53 | <para>systemd-udevd listens to kernel uevents. For every event, systemd-udevd executes matching |
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54 | instructions specified in udev rules. See <citerefentry> |
55 | <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum> | |
56 | </citerefentry>.</para> | |
b130944f | 57 | <para>The behavior of the running daemon can be changed with |
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58 | <command>udevadm control</command>.</para> |
59 | </refsect1> | |
420a506e | 60 | |
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61 | <refsect1><title>Options</title> |
62 | <variablelist> | |
63 | <varlistentry> | |
64 | <term><option>--daemon</option></term> | |
65 | <listitem> | |
66 | <para>Detach and run in the background.</para> | |
67 | </listitem> | |
68 | </varlistentry> | |
69 | <varlistentry> | |
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70 | <term><option>--debug</option></term> |
71 | <listitem> | |
72 | <para>Print debug messages to stderr.</para> | |
73 | </listitem> | |
74 | </varlistentry> | |
75 | <varlistentry> | |
76 | <term><option>--children-max=</option></term> | |
63749b1a | 77 | <listitem> |
8f7f1a2b | 78 | <para>Limit the number of parallel executed events.</para> |
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79 | </listitem> |
80 | </varlistentry> | |
81 | <varlistentry> | |
9fa68615 | 82 | <term><option>--exec-delay=</option></term> |
63749b1a | 83 | <listitem> |
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84 | <para>Number of seconds to delay the execution of RUN instructions. |
85 | This might be useful when debugging system crashes during coldplug | |
86 | cause by loading non-working kernel modules.</para> | |
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87 | </listitem> |
88 | </varlistentry> | |
89 | <varlistentry> | |
9fa68615 | 90 | <term><option>--resolve-names=</option></term> |
63749b1a | 91 | <listitem> |
f13b388f | 92 | <para>Specify when systemd-udevd should resolve names of users and groups. |
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93 | When set to <option>early</option> (the default) names will be |
94 | resolved when the rules are parsed. When set to | |
95 | <option>late</option> names will be resolved for every event. | |
96 | When set to <option>never</option> names will never be resolved | |
97 | and all devices will be owned by root.</para> | |
98 | </listitem> | |
99 | </varlistentry> | |
100 | <varlistentry> | |
101 | <term><option>--version</option></term> | |
102 | <listitem> | |
103 | <para>Print version number.</para> | |
104 | </listitem> | |
105 | </varlistentry> | |
106 | <varlistentry> | |
107 | <term><option>--help</option></term> | |
108 | <listitem> | |
109 | <para>Print help text.</para> | |
110 | </listitem> | |
111 | </varlistentry> | |
112 | </variablelist> | |
113 | </refsect1> | |
420a506e | 114 | |
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115 | <refsect1><title>Environment</title> |
116 | <variablelist> | |
117 | <varlistentry> | |
8f7f1a2b | 118 | <term><varname>UDEV_LOG=</varname></term> |
63749b1a | 119 | <listitem> |
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120 | <para>Set the logging priority.</para> |
121 | </listitem> | |
122 | </varlistentry> | |
123 | </variablelist> | |
124 | </refsect1> | |
125 | ||
126 | <refsect1><title>Kernel command line</title> | |
127 | <variablelist> | |
e6f86cac | 128 | <para>The parameters starting with "rd.", will be read when udev is used in an initrd.</para> |
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129 | <varlistentry> |
130 | <term><varname>udev.log-priority=</varname></term> | |
e6f86cac | 131 | <term><varname>rd.udev.log-priority=</varname></term> |
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132 | <listitem> |
133 | <para>Set the logging priority.</para> | |
134 | </listitem> | |
135 | </varlistentry> | |
136 | <varlistentry> | |
137 | <term><varname>udev.children-max=</varname></term> | |
e6f86cac | 138 | <term><varname>rd.udev.children-max=</varname></term> |
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139 | <listitem> |
140 | <para>Limit the number of parallel executed events.</para> | |
141 | </listitem> | |
142 | </varlistentry> | |
143 | <varlistentry> | |
144 | <term><varname>udev.exec-delay=</varname></term> | |
e6f86cac | 145 | <term><varname>rd.udev.exec-delay=</varname></term> |
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146 | <listitem> |
147 | <para>Number of seconds to delay the execution of RUN instructions. | |
148 | This might be useful when debugging system crashes during coldplug | |
149 | cause by loading non-working kernel modules.</para> | |
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150 | </listitem> |
151 | </varlistentry> | |
152 | </variablelist> | |
153 | </refsect1> | |
7b86ada7 | 154 | |
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155 | <refsect1> |
156 | <title>See Also</title> | |
157 | <para><citerefentry> | |
158 | <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum> | |
8f7f1a2b | 159 | </citerefentry>, <citerefentry> |
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160 | <refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum> |
161 | </citerefentry></para> | |
162 | </refsect1> | |
163 | </refentry> |