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authorLuke Shumaker <lukeshu@sbcglobal.net>2016-10-26 21:39:30 -0400
committerLuke Shumaker <lukeshu@sbcglobal.net>2016-10-26 21:39:30 -0400
commit184094edf59db6a7b753ef7731c7728727c842b7 (patch)
tree51dbf473a53ce418b1fba05c57fcc63f0065253f /src/grp-udev/systemd-udevd/systemd-udevd.service.xml
parent0167e6da4c08602585217269f0a9485d534e77d7 (diff)
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+<?xml version='1.0'?> <!--*- Mode: nxml; nxml-child-indent: 2; indent-tabs-mode: nil -*-->
+<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.2//EN"
+ "http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
+
+<refentry id="systemd-udevd.service"
+ xmlns:xi="http://www.w3.org/2001/XInclude">
+
+ <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-udevd.service</refentrytitle>
+ <manvolnum>8</manvolnum>
+ </refmeta>
+
+ <refnamediv>
+ <refname>systemd-udevd.service</refname>
+ <refname>systemd-udevd-control.socket</refname>
+ <refname>systemd-udevd-kernel.socket</refname>
+ <refname>systemd-udevd</refname>
+ <refpurpose>Device event managing daemon</refpurpose>
+ </refnamediv>
+
+ <refsynopsisdiv>
+ <para><filename>systemd-udevd.service</filename></para>
+ <para><filename>systemd-udevd-control.socket</filename></para>
+ <para><filename>systemd-udevd-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>--event-timeout=</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><command>systemd-udevd</command> 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 daemon can be configured using
+ <citerefentry><refentrytitle>udev.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ its command line options, environment variables, and on the kernel
+ command line, or changed dynamically 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 standard error.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--children-max=</option></term>
+ <listitem>
+ <para>Limit the number of events executed in parallel.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--exec-delay=</option></term>
+ <listitem>
+ <para>Delay the execution of <varname>RUN</varname>
+ instructions by the given number of seconds. This option
+ might be useful when debugging system crashes during
+ coldplug caused by loading non-working kernel
+ modules.</para>
+ </listitem>
+ </varlistentry>
+
+ <varlistentry>
+ <term><option>--event-timeout=</option></term>
+ <listitem>
+ <para>Set the number of seconds to wait for events to finish. After
+ this time, the event will be terminated. The default is 180 seconds.</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>--help</option></term>
+
+ <xi:include href="standard-options.xml" xpointer="help-text" />
+ </varlistentry>
+ <xi:include href="standard-options.xml" xpointer="version" />
+ </variablelist>
+ </refsect1>
+
+ <refsect1><title>Kernel command line</title>
+ <variablelist class='kernel-commandline-options'>
+ <para>Parameters starting with "rd." will be read when
+ <command>systemd-udevd</command> 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 log level.</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 events executed in parallel.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>udev.exec-delay=</varname></term>
+ <term><varname>rd.udev.exec-delay=</varname></term>
+ <listitem>
+ <para>Delay the execution of <varname>RUN</varname> instructions by the given
+ number of seconds. This option might be useful when
+ debugging system crashes during coldplug caused by loading
+ non-working kernel modules.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>udev.event-timeout=</varname></term>
+ <term><varname>rd.udev.event-timeout=</varname></term>
+ <listitem>
+ <para>Wait for events to finish up to the given number
+ of seconds. This option might be useful if events are
+ terminated due to kernel drivers taking too long to initialize.</para>
+ </listitem>
+ </varlistentry>
+ <varlistentry>
+ <term><varname>net.ifnames=</varname></term>
+ <listitem>
+ <para>Network interfaces are renamed to give them predictable names
+ when possible. It is enabled by default; specifying 0 disables it.</para>
+ </listitem>
+ </varlistentry>
+ </variablelist>
+ <!-- when adding entries here, consider also adding them
+ in kernel-command-line.xml -->
+ </refsect1>
+
+ <refsect1>
+ <title>See Also</title>
+ <para>
+ <citerefentry><refentrytitle>udev.conf</refentrytitle><manvolnum>5</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
+ <citerefentry><refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum></citerefentry>
+ </para>
+ </refsect1>
+</refentry>