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0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony<refentry id="systemd-udevd.service">

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refentryinfo>

d1636bdc2e674b84ee46f534b51be18ecac6bef5rbowen <title>systemd-udevd.service</title>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <productname>systemd</productname>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <authorgroup>

d29d9ab4614ff992b0e8de6e2b88d52b6f1f153erbowen <author>

d29d9ab4614ff992b0e8de6e2b88d52b6f1f153erbowen <contrib>Developer</contrib>

d29d9ab4614ff992b0e8de6e2b88d52b6f1f153erbowen <firstname>Kay</firstname>

d29d9ab4614ff992b0e8de6e2b88d52b6f1f153erbowen <surname>Sievers</surname>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <email>kay@vrfy.org</email>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </author>

af33a4994ae2ff15bc67d19ff1a7feb906745bf8rbowen </authorgroup>

3f08db06526d6901aa08c110b5bc7dde6bc39905nd </refentryinfo>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refmeta>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refentrytitle>systemd-udevd.service</refentrytitle>

d1636bdc2e674b84ee46f534b51be18ecac6bef5rbowen <manvolnum>8</manvolnum>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refmiscinfo class="version"></refmiscinfo>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </refmeta>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refnamediv>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refname>systemd-udevd.service</refname>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refname>systemd-udevd-control.socket</refname>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refname>systemd-udevd-kernel.socket</refname>

f086b4b402fa9a2fefc7dda85de2a3cc1cd0a654rjung <refname>systemd-udevd</refname>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refpurpose>Device event managing daemon</refpurpose>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </refnamediv>

d1636bdc2e674b84ee46f534b51be18ecac6bef5rbowen

d1636bdc2e674b84ee46f534b51be18ecac6bef5rbowen <refsynopsisdiv>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para><filename>systemd-udevd.service</filename></para>

d1636bdc2e674b84ee46f534b51be18ecac6bef5rbowen <para><filename>systemd-udevd-control.socket</filename></para>

d1636bdc2e674b84ee46f534b51be18ecac6bef5rbowen <para><filename>systemd-udevd-kernel.socket</filename></para>

d1636bdc2e674b84ee46f534b51be18ecac6bef5rbowen

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <cmdsynopsis>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <command>/usr/lib/systemd/systemd-udevd</command>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <arg><option>--daemon</option></arg>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <arg><option>--debug</option></arg>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <arg><option>--children-max=</option></arg>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <arg><option>--exec-delay=</option></arg>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <arg><option>--resolve-names=early|late|never</option></arg>

30471a4650391f57975f60bbb6e4a90be7b284bfhumbedooh <arg><option>--version</option></arg>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <arg><option>--help</option></arg>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </cmdsynopsis>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </refsynopsisdiv>

d1636bdc2e674b84ee46f534b51be18ecac6bef5rbowen

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refsect1><title>Description</title>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para>systemd-udevd listens to kernel uevents. For every event, systemd-udevd executes matching

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony instructions specified in udev rules. See <citerefentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </citerefentry>.</para>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para>The behavior of the running daemon can be changed with

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <command>udevadm control</command>.</para>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </refsect1>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refsect1><title>Options</title>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <variablelist>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <term><option>--daemon</option></term>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para>Detach and run in the background.</para>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <term><option>--debug</option></term>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para>Print debug messages to stderr.</para>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <term><option>--children-max=</option></term>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para>Limit the number of parallel executed events.</para>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <term><option>--exec-delay=</option></term>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para>Number of seconds to delay the execution of RUN instructions.

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony This might be useful when debugging system crashes during coldplug

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony cause by loading non-working kernel modules.</para>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <term><option>--resolve-names=</option></term>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para>Specify when systemd-udevd should resolve names of users and groups.

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony When set to <option>early</option> (the default) names will be

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony resolved when the rules are parsed. When set to

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <option>late</option> names will be resolved for every event.

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony When set to <option>never</option> names will never be resolved

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony and all devices will be owned by root.</para>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <term><option>--version</option></term>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para>Print version number.</para>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <term><option>--help</option></term>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para>Print help text.</para>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </variablelist>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </refsect1>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refsect1><title>Environment</title>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <variablelist>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <term><varname>UDEV_LOG=</varname></term>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para>Set the logging priority.</para>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </variablelist>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </refsect1>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refsect1><title>Kernel command line</title>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <variablelist>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para>The parameters starting with "rd.", will be read when udev is used in an initrd.</para>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <term><varname>udev.log-priority=</varname></term>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <term><varname>rd.udev.log-priority=</varname></term>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para>Set the logging priority.</para>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <term><varname>udev.children-max=</varname></term>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <term><varname>rd.udev.children-max=</varname></term>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para>Limit the number of parallel executed events.</para>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <term><varname>udev.exec-delay=</varname></term>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <term><varname>rd.udev.exec-delay=</varname></term>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para>Number of seconds to delay the execution of RUN instructions.

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony This might be useful when debugging system crashes during coldplug

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony cause by loading non-working kernel modules.</para>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </listitem>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </varlistentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </variablelist>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </refsect1>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refsect1>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <title>See Also</title>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <para><citerefentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </citerefentry>, <citerefentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony <refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </citerefentry></para>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony </refsect1>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony</refentry>

0f6bc9e2c8229996a73fb57ec6c45841346ebcb1pctony