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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> |
bad1837c | 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> | |
bad1837c | 30 | <refname>systemd-udevd</refname> |
b79f817b | 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> |
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53 | <para><command>systemd-udevd</command> listens to kernel uevents. |
54 | For every event, systemd-udevd executes matching instructions | |
55 | specified in udev rules. See <citerefentry> | |
56 | <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum> | |
b130944f | 57 | </citerefentry>.</para> |
b130944f | 58 | <para>The behavior of the running daemon can be changed with |
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59 | <command>udevadm control</command>.</para> |
60 | </refsect1> | |
420a506e | 61 | |
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62 | <refsect1><title>Options</title> |
63 | <variablelist> | |
64 | <varlistentry> | |
65 | <term><option>--daemon</option></term> | |
66 | <listitem> | |
67 | <para>Detach and run in the background.</para> | |
68 | </listitem> | |
69 | </varlistentry> | |
70 | <varlistentry> | |
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71 | <term><option>--debug</option></term> |
72 | <listitem> | |
73 | <para>Print debug messages to stderr.</para> | |
74 | </listitem> | |
75 | </varlistentry> | |
76 | <varlistentry> | |
77 | <term><option>--children-max=</option></term> | |
63749b1a | 78 | <listitem> |
b8e8f0cb | 79 | <para>Limit the number of events executed in parallel.</para> |
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80 | </listitem> |
81 | </varlistentry> | |
82 | <varlistentry> | |
9fa68615 | 83 | <term><option>--exec-delay=</option></term> |
63749b1a | 84 | <listitem> |
b8e8f0cb | 85 | |
bb31a4ac | 86 | <para>Delay the execution of RUN instruction by the given |
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87 | number of seconds. This option might be useful when |
88 | debugging system crashes during coldplug caused by loading | |
89 | non-working kernel modules.</para> | |
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90 | </listitem> |
91 | </varlistentry> | |
92 | <varlistentry> | |
9fa68615 | 93 | <term><option>--resolve-names=</option></term> |
63749b1a | 94 | <listitem> |
f13b388f | 95 | <para>Specify when systemd-udevd should resolve names of users and groups. |
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96 | When set to <option>early</option> (the default) names will be |
97 | resolved when the rules are parsed. When set to | |
98 | <option>late</option> names will be resolved for every event. | |
99 | When set to <option>never</option> names will never be resolved | |
100 | and all devices will be owned by root.</para> | |
101 | </listitem> | |
102 | </varlistentry> | |
103 | <varlistentry> | |
104 | <term><option>--version</option></term> | |
105 | <listitem> | |
106 | <para>Print version number.</para> | |
107 | </listitem> | |
108 | </varlistentry> | |
109 | <varlistentry> | |
110 | <term><option>--help</option></term> | |
111 | <listitem> | |
112 | <para>Print help text.</para> | |
113 | </listitem> | |
114 | </varlistentry> | |
115 | </variablelist> | |
116 | </refsect1> | |
420a506e | 117 | |
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118 | <refsect1><title>Environment</title> |
119 | <variablelist> | |
120 | <varlistentry> | |
8f7f1a2b | 121 | <term><varname>UDEV_LOG=</varname></term> |
63749b1a | 122 | <listitem> |
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123 | <para>Set the logging priority.</para> |
124 | </listitem> | |
125 | </varlistentry> | |
126 | </variablelist> | |
127 | </refsect1> | |
128 | ||
129 | <refsect1><title>Kernel command line</title> | |
130 | <variablelist> | |
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131 | <para>Parameters starting with "rd." will be read when |
132 | <command>systemd-udevd</command> is used in an initrd.</para> | |
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133 | <varlistentry> |
134 | <term><varname>udev.log-priority=</varname></term> | |
e6f86cac | 135 | <term><varname>rd.udev.log-priority=</varname></term> |
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136 | <listitem> |
137 | <para>Set the logging priority.</para> | |
138 | </listitem> | |
139 | </varlistentry> | |
140 | <varlistentry> | |
141 | <term><varname>udev.children-max=</varname></term> | |
e6f86cac | 142 | <term><varname>rd.udev.children-max=</varname></term> |
8f7f1a2b | 143 | <listitem> |
b8e8f0cb | 144 | <para>Limit the number of events executed in parallel.</para> |
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145 | </listitem> |
146 | </varlistentry> | |
147 | <varlistentry> | |
148 | <term><varname>udev.exec-delay=</varname></term> | |
e6f86cac | 149 | <term><varname>rd.udev.exec-delay=</varname></term> |
8f7f1a2b | 150 | <listitem> |
bb31a4ac | 151 | <para>Delay the execution of RUN instruction by the given |
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152 | number of seconds. This option might be useful when |
153 | debugging system crashes during coldplug caused by loading | |
154 | non-working kernel modules.</para> | |
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155 | </listitem> |
156 | </varlistentry> | |
157 | </variablelist> | |
158 | </refsect1> | |
7b86ada7 | 159 | |
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160 | <refsect1> |
161 | <title>See Also</title> | |
162 | <para><citerefentry> | |
163 | <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum> | |
8f7f1a2b | 164 | </citerefentry>, <citerefentry> |
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165 | <refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum> |
166 | </citerefentry></para> | |
167 | </refsect1> | |
168 | </refentry> |