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<?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="udevd">
<refentryinfo>
<title>udevd</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>udevd</refentrytitle>
<manvolnum>8</manvolnum>
<refmiscinfo class="version"></refmiscinfo>
</refmeta>
<refnamediv>
<refname>udevd</refname><refpurpose>event managing daemon</refpurpose>
</refnamediv>
<refsynopsisdiv>
<cmdsynopsis>
<command>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>udevd listens to kernel uevents. For every event, udevd executes matching
instructions specified in udev rules. See <citerefentry>
<refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum>
</citerefentry>.</para>
<para>On startup the content of the directory <filename>/usr/lib/udev/devices</filename>
is copied to <filename>/dev</filename>. If kernel modules specify static device
nodes, these nodes are created even without a corresponding kernel device, to
allow on-demand loading of kernel modules. Matching permissions specified in udev
rules are applied to these static device nodes.</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 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>
<varlistentry>
<term><varname>udev.log-priority=</varname></term>
<listitem>
<para>Set the logging priority.</para>
</listitem>
</varlistentry>
<varlistentry>
<term><varname>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>
<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>
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