summaryrefslogtreecommitdiff
path: root/man/systemd-udev.service.xml
blob: 537b49ff300f885e5906e0e7a5a14d6c9edeaf31 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
<?xml version='1.0'?>
<?xml-stylesheet type="text/xsl" href="http://docbook.sourceforge.net/release/xsl/current/xhtml/docbook.xsl"?>
<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
  "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">

<refentry id="systemd-udev.service">
  <refentryinfo>
    <title>systemd-udevd.service</title>
    <productname>systemd</productname>
    <authorgroup>
      <author>
        <contrib>Developer</contrib>
        <firstname>Kay</firstname>
        <surname>Sievers</surname>
        <email>kay@vrfy.org</email>
      </author>
    </authorgroup>
  </refentryinfo>

  <refmeta>
    <refentrytitle>systemd-udev.service</refentrytitle>
    <manvolnum>8</manvolnum>
    <refmiscinfo class="version"></refmiscinfo>
  </refmeta>

  <refnamediv>
    <refname>systemd-udev.service</refname>
    <refname>systemd-udev-control.socket</refname>
    <refname>systemd-udev-kernel.socket</refname>
    <refname>systemd-udevd</refname>
    <refpurpose>Device event managing daemon</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <para><filename>systemd-udev.service</filename></para>
    <para><filename>systemd-udev-control.socket</filename></para>
    <para><filename>systemd-udev-kernel.socket</filename></para>

    <cmdsynopsis>
      <command>/usr/lib/systemd/systemd-udevd</command>
      <arg><option>--daemon</option></arg>
      <arg><option>--debug</option></arg>
      <arg><option>--children-max=</option></arg>
      <arg><option>--exec-delay=</option></arg>
      <arg><option>--resolve-names=early|late|never</option></arg>
      <arg><option>--version</option></arg>
      <arg><option>--help</option></arg>
    </cmdsynopsis>

  </refsynopsisdiv>

  <refsect1><title>Description</title>
    <para>systemd-udevd listens to kernel uevents. For every event, systemd-udevd executes matching
    instructions specified in udev rules. See <citerefentry>
        <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum>
      </citerefentry>.</para>
    <para>The behavior of the running daemon can be changed with
    <command>udevadm control</command>.</para>
  </refsect1>

  <refsect1><title>Options</title>
    <variablelist>
      <varlistentry>
        <term><option>--daemon</option></term>
        <listitem>
          <para>Detach and run in the background.</para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term><option>--debug</option></term>
        <listitem>
          <para>Print debug messages to stderr.</para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term><option>--children-max=</option></term>
        <listitem>
          <para>Limit the number of parallel executed events.</para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term><option>--exec-delay=</option></term>
        <listitem>
          <para>Number of seconds to delay the execution of RUN instructions.
          This might be useful when debugging system crashes during coldplug
          cause by loading non-working kernel modules.</para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term><option>--resolve-names=</option></term>
        <listitem>
          <para>Specify when systemd-udevd should resolve names of users and groups.
          When set to <option>early</option> (the default) names will be
          resolved when the rules are parsed.  When set to
          <option>late</option> names will be resolved for every event.
          When set to <option>never</option> names will never be resolved
          and all devices will be owned by root.</para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term><option>--version</option></term>
        <listitem>
          <para>Print version number.</para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term><option>--help</option></term>
        <listitem>
          <para>Print help text.</para>
        </listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1><title>Environment</title>
    <variablelist>
      <varlistentry>
        <term><varname>UDEV_LOG=</varname></term>
        <listitem>
          <para>Set the logging priority.</para>
        </listitem>
      </varlistentry>
    </variablelist>
 </refsect1>

  <refsect1><title>Kernel command line</title>
    <variablelist>
      <para>The parameters starting with "rd.", will be read when udev is used in an initrd.</para>
      <varlistentry>
        <term><varname>udev.log-priority=</varname></term>
        <term><varname>rd.udev.log-priority=</varname></term>
        <listitem>
          <para>Set the logging priority.</para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term><varname>udev.children-max=</varname></term>
        <term><varname>rd.udev.children-max=</varname></term>
        <listitem>
          <para>Limit the number of parallel executed events.</para>
        </listitem>
      </varlistentry>
      <varlistentry>
        <term><varname>udev.exec-delay=</varname></term>
        <term><varname>rd.udev.exec-delay=</varname></term>
        <listitem>
          <para>Number of seconds to delay the execution of RUN instructions.
          This might be useful when debugging system crashes during coldplug
          cause by loading non-working kernel modules.</para>
        </listitem>
      </varlistentry>
    </variablelist>
 </refsect1>

  <refsect1>
    <title>See Also</title>
    <para><citerefentry>
        <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum>
      </citerefentry>, <citerefentry>
        <refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum>
    </citerefentry></para>
  </refsect1>
</refentry>