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52 lines
2.3 KiB
XML
52 lines
2.3 KiB
XML
<?xml version='1.0'?>
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<!DOCTYPE refentry PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
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"http://www.oasis-open.org/docbook/xml/4.2/docbookx.dtd">
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<!-- SPDX-License-Identifier: LGPL-2.1+ -->
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<refentry id="systemd-udev-settle.service"
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xmlns:xi="http://www.w3.org/2001/XInclude">
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<refentryinfo>
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<title>systemd-udev-settle.service</title>
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<productname>systemd</productname>
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</refentryinfo>
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<refmeta>
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<refentrytitle>systemd-udev-settle.service</refentrytitle>
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<manvolnum>8</manvolnum>
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</refmeta>
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<refnamediv>
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<refname>systemd-udev-settle.service</refname>
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<refpurpose>Wait for all pending udev events to be handled</refpurpose>
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</refnamediv>
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<refsynopsisdiv>
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<para><filename>systemd-udev-settle.service</filename></para>
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</refsynopsisdiv>
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<refsect1><title>Description</title>
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<para>This service calls <command>udevadm settle</command> to wait until all events that have been queued
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by <citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry> have been
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processed. It is a crude way to wait until "all" hardware has been discovered. Services may pull in this
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service and order themselves after it to wait for the udev queue to be empty.</para>
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<para><emphasis>Using this service is not recommended.</emphasis> There can be no guarantee that hardware
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is fully discovered at any specific time, because the kernel does hardware detection asynchronously, and
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certain buses and devices take a very long time to become ready, and also additional hardware may be
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plugged in at any time. Instead, services should subscribe to udev events and react to any new hardware as
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it is discovered. Services that, based on configuration, expect certain devices to appear, may warn or
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report failure after a timeout. This timeout should be tailored to the hardware type. Waiting for
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<filename>systemd-udev-settle.service</filename> usually slows boot significantly, because it means waiting
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for all unrelated events too.</para>
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</refsect1>
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<refsect1>
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<title>See Also</title>
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<para>
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<citerefentry><refentrytitle>udev</refentrytitle><manvolnum>7</manvolnum></citerefentry>,
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<citerefentry><refentrytitle>udevadm</refentrytitle><manvolnum>8</manvolnum></citerefentry>
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</para>
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</refsect1>
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</refentry>
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