1<?xml version='1.0'?> 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" 4 "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd"> 5 6<refentry id="udevd"> 7 <refentryinfo> 8 <title>udevd</title> 9 <productname>eudev</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> 18 </refentryinfo> 19 20 <refmeta> 21 <refentrytitle>udevd</refentrytitle> 22 <manvolnum>8</manvolnum> 23 </refmeta> 24 25 <refnamediv> 26 <refname>udevd</refname> 27 <refpurpose>Device event managing daemon</refpurpose> 28 </refnamediv> 29 30 <refsynopsisdiv> 31 <para><filename>udevd</filename></para> 32 33 <cmdsynopsis> 34 <command>/sbin/udevd</command> 35 <arg><option>--daemon</option></arg> 36 <arg><option>--debug</option></arg> 37 <arg><option>--children-max=</option></arg> 38 <arg><option>--exec-delay=</option></arg> 39 <arg><option>--event-timeout=</option></arg> 40 <arg><option>--resolve-names=early|late|never</option></arg> 41 <arg><option>--version</option></arg> 42 <arg><option>--help</option></arg> 43 </cmdsynopsis> 44 45 </refsynopsisdiv> 46 47 <refsect1><title>Description</title> 48 <para><command>udevd</command> listens to kernel uevents. 49 For every event, udevd executes matching instructions 50 specified in udev rules. See <citerefentry> 51 <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum> 52 </citerefentry>.</para> 53 54 <para>The behavior of the daemon can be configured using 55 <citerefentry><refentrytitle>udev.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, 56 its command-line options, environment variables, and on the kernel 57 command-line, or changed dynamically with <command>udevadm 58 control</command>. 59 </para> 60 </refsect1> 61 62 <refsect1><title>Options</title> 63 <variablelist> 64 <varlistentry> 65 <term><option>-d</option>, <option>--daemon</option></term> 66 <listitem> 67 <para>Detach and run in the background.</para> 68 </listitem> 69 </varlistentry> 70 71 <varlistentry> 72 <term><option>-D</option>, <option>--debug</option></term> 73 <listitem> 74 <para>Print debug messages to standard error.</para> 75 </listitem> 76 </varlistentry> 77 78 <varlistentry> 79 <term><option>-c</option>, <option>--children-max=</option></term> 80 <listitem> 81 <para>Limit the number of events executed in parallel.</para> 82 </listitem> 83 </varlistentry> 84 85 <varlistentry> 86 <term><option>-e</option>, <option>--exec-delay=</option></term> 87 <listitem> 88 <para>Delay the execution of <varname>RUN</varname> 89 instructions by the given number of seconds. This option 90 might be useful when debugging system crashes during 91 coldplug caused by loading non-working kernel 92 modules.</para> 93 </listitem> 94 </varlistentry> 95 96 <varlistentry> 97 <term><option>-t</option>, <option>--event-timeout=</option></term> 98 <listitem> 99 <para>Set the number of seconds to wait for events to finish. After 100 this time the event will be terminated. The default is 30 seconds.</para> 101 </listitem> 102 </varlistentry> 103 104 <varlistentry> 105 <term><option>-N</option>, <option>--resolve-names=</option></term> 106 <listitem> 107 <para>Specify when udevd should resolve names of users and groups. 108 When set to <option>early</option> (the default), names will be 109 resolved when the rules are parsed. When set to 110 <option>late</option>, names will be resolved for every event. 111 When set to <option>never</option>, names will never be resolved 112 and all devices will be owned by root.</para> 113 </listitem> 114 </varlistentry> 115 116 <varlistentry> 117 <term><option>-h</option>, <option>--help</option></term> 118 119 </varlistentry> 120 </variablelist> 121 </refsect1> 122 123 <refsect1><title>Kernel command line</title> 124 <variablelist class='kernel-commandline-options'> 125 <para>Parameters starting with "rd." will be read when 126 <command>udevd</command> is used in an initrd.</para> 127 <varlistentry> 128 <term><varname>udev.log-priority=</varname></term> 129 <term><varname>rd.udev.log-priority=</varname></term> 130 <listitem> 131 <para>Set the log level.</para> 132 </listitem> 133 </varlistentry> 134 <varlistentry> 135 <term><varname>udev.children-max=</varname></term> 136 <term><varname>rd.udev.children-max=</varname></term> 137 <listitem> 138 <para>Limit the number of events executed in parallel.</para> 139 </listitem> 140 </varlistentry> 141 <varlistentry> 142 <term><varname>udev.exec-delay=</varname></term> 143 <term><varname>rd.udev.exec-delay=</varname></term> 144 <listitem> 145 <para>Delay the execution of <varname>RUN</varname> instructions by the given 146 number of seconds. This option might be useful when 147 debugging system crashes during coldplug caused by loading 148 non-working kernel modules.</para> 149 </listitem> 150 </varlistentry> 151 <varlistentry> 152 <term><varname>udev.event-timeout=</varname></term> 153 <term><varname>rd.udev.event-timeout=</varname></term> 154 <listitem> 155 <para>Wait for events to finish up to the given number 156 of seconds. This option might be useful if events are 157 terminated due to kernel drivers taking too long to initialize.</para> 158 </listitem> 159 </varlistentry> 160 <varlistentry> 161 <term><varname>net.ifnames=</varname></term> 162 <listitem> 163 <para>Network interfaces are renamed to give them predictable names 164 when possible. It is enabled by default; specifying 0 disables it.</para> 165 </listitem> 166 </varlistentry> 167 </variablelist> 168 <!-- when adding entries here, consider also adding them 169 in kernel-command-line.xml --> 170 </refsect1> 171 172 <refsect1> 173 <title>See Also</title> 174 <para> 175 <citerefentry><refentrytitle>udev.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>, 176 <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>, 177 <citerefentry><refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum></citerefentry> 178 </para> 179 </refsect1> 180</refentry> 181