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git-svn-id: http://svn.linuxfromscratch.org/LFS/branches/6.1/BOOK@6299 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
188 lines
7.0 KiB
XML
188 lines
7.0 KiB
XML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN" "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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<!ENTITY % general-entities SYSTEM "../general.ent">
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%general-entities;
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]>
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<sect1 id="ch-system-hotplug" xreflabel="Hotplug" role="wrap">
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<title>Hotplug-&hotplug-version;</title>
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<?dbhtml filename="hotplug.html"?>
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<indexterm zone="ch-system-hotplug"><primary sortas="a-Hotplug">Hotplug</primary></indexterm>
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<sect2 role="package"><title/>
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<para>The Hotplug package contains scripts that react upon hotplug events
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generated by the kernel. Such events correspond to every change in the kernel
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state visible in the <systemitem class="filesystem">sysfs</systemitem>
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filesystem, e.g., the addition and removal of hardware. This package also
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detects existing hardware during boot and inserts the relevant modules into the
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running kernel.</para>
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<segmentedlist>
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<segtitle>&buildtime;</segtitle>
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<segtitle>&diskspace;</segtitle>
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<seglistitem><seg>0.01 SBU</seg><seg>460 KB</seg></seglistitem>
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</segmentedlist>
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<segmentedlist>
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<segtitle>&dependencies;</segtitle>
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<seglistitem><seg>Bash, Coreutils, Find, Gawk, and Make</seg></seglistitem>
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</segmentedlist>
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</sect2>
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<sect2 role="installation">
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<title>Installation of Hotplug</title>
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<para>Install the Hotplug package:</para>
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<screen><userinput>make install</userinput></screen>
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<para>Copy a file that the <quote>install</quote> target omits.</para>
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<screen><userinput>cp etc/hotplug/pnp.distmap /etc/hotplug</userinput></screen>
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<para>Remove the init script that Hotplug installs, since we're going to be
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using the script included with LFS-Bootscripts:</para>
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<screen><userinput>rm -rf /etc/init.d</userinput></screen>
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<para>Network device hotplugging is not supported by LFS-Bootscripts yet. For
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that reason, remove the network hotplug agent:</para>
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<screen><userinput>rm -f /etc/hotplug/net.agent</userinput></screen>
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<para>Create a directory for storing firmware that can be loaded by
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<command>hotplug</command>:</para>
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<screen><userinput>mkdir /lib/firmware</userinput></screen>
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</sect2>
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<sect2 id="contents-hotplug" role="content"><title>Contents of Hotplug</title>
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<segmentedlist>
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<segtitle>Installed program</segtitle>
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<segtitle>Installed scripts</segtitle>
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<segtitle>Installed files</segtitle>
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<seglistitem><seg>hotplug</seg>
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<seg>/etc/hotplug/*.rc, /etc/hotplug/*.agent</seg>
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<seg>/etc/hotplug/hotplug.functions, /etc/hotplug/blacklist, /etc/hotplug/{pci,usb},
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/etc/hotplug/usb.usermap, /etc/hotplug.d, and /var/log/hotplug/events</seg></seglistitem>
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</segmentedlist>
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<beginpage/>
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<variablelist><bridgehead renderas="sect3">Short Descriptions</bridgehead>
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<?dbfo list-presentation="list"?>
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<?dbhtml list-presentation="table"?>
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<varlistentry id="hotplug">
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<term><command>hotplug</command></term>
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<listitem>
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<para>This script is called by default by the Linux kernel when something
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changes in its internal state (e.g., a new device is added or an existing device
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is removed)</para>
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<indexterm zone="ch-system-hotplug hotplug"><primary
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sortas="b-hotplug">hotplug</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="hotplug-rc">
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<term><command>/etc/hotplug/*.rc</command></term>
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<listitem>
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<para>These scripts are used for cold plugging, i.e., detecting and acting upon
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hardware already present during system startup. They are called by the
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<filename>hotplug</filename> initscript that comes from the LFS-Bootscripts
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package. The <command>*.rc</command> scripts try to recover hotplug events that
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were lost during system boot because, for example, the root filesystem was not
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mounted by the kernel</para>
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<indexterm zone="ch-system-hotplug hotplug-rc"><primary
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sortas="d-/etc/hotplug/*.rc">/etc/hotplug/*.rc</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="hotplug-agent">
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<term><command>/etc/hotplug/*.agent</command></term>
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<listitem>
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<para>These scripts are called by <command>hotplug</command>
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in response to different types of hotplug events generated by the kernel.
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Their action is to insert corresponding kernel modules and call any
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user-provided scripts</para>
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<indexterm zone="ch-system-hotplug hotplug-agent"><primary
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sortas="d-/etc/hotplug/*.agent">/etc/hotplug/*.agent</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="hotplug-blacklist">
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<term><filename>/etc/hotplug/blacklist</filename></term>
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<listitem>
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<para>This file contains the list of modules that should never be inserted into
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the kernel by the Hotplug scripts</para>
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<indexterm zone="ch-system-hotplug hotplug-blacklist"><primary
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sortas="e-/etc/hotplug/blacklist">/etc/hotplug/blacklist</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="hotplug-functions">
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<term><filename>/etc/hotplug/hotplug.functions</filename></term>
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<listitem>
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<para>This file contains common functions used by other scripts in the Hotplug
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package</para>
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<indexterm zone="ch-system-hotplug hotplug-functions"><primary
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sortas="e-/etc/hotplug/hotplug.functions">/etc/hotplug/hotplug.functions</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="hotplug-subdirs">
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<term><filename class="directory">/etc/hotplug/{pci,usb}</filename></term>
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<listitem>
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<para>These directories contain user-written handlers for hotplug events</para>
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<indexterm zone="ch-system-hotplug hotplug-subdirs"><primary
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sortas="e-/etc/hotplug/{pci,usb}">/etc/hotplug/{pci,usb}</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="hotplug-usb.usermap">
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<term><filename>/etc/hotplug/usb.usermap</filename></term>
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<listitem>
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<para>This file contains rules that determine which user-defined handlers to
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call for each USB device, based on its vendor ID and other attributes</para>
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<indexterm zone="ch-system-hotplug hotplug-usb.usermap"><primary
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sortas="e-/etc/hotplug/usb.usermap">/etc/hotplug/usb.usermap</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="hotplug-hotplug.d">
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<term><filename class="directory">/etc/hotplug.d</filename></term>
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<listitem>
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<para>This directory contains programs (or symlinks to them) that are interested
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in receiving hotplug events. For example, Udev puts its symlink here during
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installation</para>
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<indexterm zone="ch-system-hotplug hotplug-hotplug.d"><primary
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sortas="e-/etc/hotplug.d">/etc/hotplug.d</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="hotplug-firmware">
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<term><filename class="directory">/lib/firmware</filename></term>
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<listitem>
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<para>This directory contains the firmware for devices that need to have their
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firmware loaded before use</para>
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<indexterm zone="ch-system-hotplug hotplug-firmware"><primary
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sortas="e-/lib/firmware">/lib/firmware</primary></indexterm>
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</listitem>
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</varlistentry>
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<varlistentry id="hotplug-events">
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<term><filename>/var/log/hotplug/events</filename></term>
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<listitem>
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<para>This file contains all the events that <command>hotplug</command> has
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called since bootup</para>
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<indexterm zone="ch-system-hotplug hotplug-events"><primary
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sortas="e-/var/log/hotplug/events">/var/log/hotplug/events</primary></indexterm>
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</listitem>
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</varlistentry>
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</variablelist>
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</sect2>
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</sect1>
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