| 1 | <?xml version="1.0" encoding="ISO-8859-1"?>
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| 2 | <!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
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| 3 | "http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
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| 4 | <!ENTITY % general-entities SYSTEM "../../general.ent">
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| 5 | %general-entities;
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| 6 | ]>
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| 7 |
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| 8 | <sect1 id="ch-system-hotplug" xreflabel="Hotplug" role="wrap">
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| 9 | <?dbhtml filename="hotplug.html"?>
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| 10 |
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| 11 | <title>Hotplug-&hotplug-version;</title>
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| 12 |
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| 13 | <indexterm zone="ch-system-hotplug">
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| 14 | <primary sortas="a-Hotplug">Hotplug</primary>
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| 15 | </indexterm>
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| 16 |
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| 17 | <sect2 role="package">
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| 18 | <title/>
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| 19 |
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| 20 | <para>The Hotplug package contains scripts that react upon hotplug events
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| 21 | generated by the kernel. Such events correspond to every change in the in the
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| 22 | kernel state visible in the <systemitem class="filesystem">sysfs</systemitem>
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| 23 | filesystem, e.g., the addition and removal of hardware. This package also
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| 24 | detects existing hardware during boot and inserts the relevant modules into
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| 25 | the running kernel.</para>
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| 26 |
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| 27 | <segmentedlist>
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| 28 | <segtitle>&dependencies;</segtitle>
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| 29 |
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| 30 | <seglistitem>
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| 31 | <seg>Bash, Coreutils, Find, Gawk, and Make</seg>
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| 32 | </seglistitem>
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| 33 | </segmentedlist>
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| 34 |
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| 35 | </sect2>
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| 36 |
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| 37 | <sect2 role="installation">
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| 38 | <title>Installation of Hotplug</title>
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| 39 |
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| 40 | <para os="a">Install the Hotplug package:</para>
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| 41 |
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| 42 | <screen os="b"><userinput>make install</userinput></screen>
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| 43 |
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| 44 | <para os="c">Remove the init script that Hotplug installs since we are going
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| 45 | to be using the script included in the LFS-Bootscripts package:</para>
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| 46 |
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| 47 | <screen os="d"><userinput>rm -rf /etc/init.d</userinput></screen>
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| 48 |
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| 49 | <para os="e">Network device hotplugging is not yet supported by the
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| 50 | LFS-Bootscripts package. For that reason, remove the network
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| 51 | hotplug agent:</para>
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| 52 |
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| 53 | <screen os="f"><userinput>rm -f /etc/hotplug/net.agent</userinput></screen>
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| 54 |
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| 55 | <para os="g">Create a directory for storing firmware that can be loaded by
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| 56 | <command>hotplug</command>:</para>
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| 57 |
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| 58 | <screen os="h"><userinput>mkdir /lib/firmware</userinput></screen>
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| 59 |
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| 60 | </sect2>
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| 61 |
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| 62 | <sect2 id="contents-hotplug" role="content">
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| 63 | <title>Contents of Hotplug</title>
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| 64 |
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| 65 | <segmentedlist>
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| 66 | <segtitle>Installed program</segtitle>
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| 67 | <segtitle>Installed scripts</segtitle>
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| 68 | <segtitle>Installed files</segtitle>
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| 69 |
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| 70 | <seglistitem>
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| 71 | <seg>hotplug</seg>
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| 72 | <seg>/etc/hotplug/*.rc, /etc/hotplug/*.agent</seg>
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| 73 | <seg>/etc/hotplug/hotplug.functions, /etc/hotplug/blacklist,
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| 74 | /etc/hotplug/{pci,usb}, /etc/hotplug/usb.usermap, /etc/hotplug.d,
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| 75 | and /var/log/hotplug/events</seg>
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| 76 | </seglistitem>
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| 77 | </segmentedlist>
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| 78 |
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| 79 | <variablelist>
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| 80 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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| 81 | <?dbfo list-presentation="list"?>
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| 82 | <?dbhtml list-presentation="table"?>
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| 83 |
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| 84 | <varlistentry id="hotplug">
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| 85 | <term><command>hotplug</command></term>
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| 86 | <listitem>
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| 87 | <para>This script is called by default by the Linux kernel when
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| 88 | something changes in its internal state (e.g., a new device is
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| 89 | added or removed)</para>
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| 90 | <indexterm zone="ch-system-hotplug hotplug">
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| 91 | <primary sortas="b-hotplug">hotplug</primary>
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| 92 | </indexterm>
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| 93 | </listitem>
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| 94 | </varlistentry>
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| 95 |
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| 96 | <varlistentry id="hotplug-rc">
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| 97 | <term><command>/etc/hotplug/*.rc</command></term>
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| 98 | <listitem>
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| 99 | <para>These scripts are used for cold plugging, i.e., detecting and
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| 100 | acting upon hardware already present during system startup. They are
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| 101 | called by the <filename>hotplug</filename> initscript included in
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| 102 | the LFS-Bootscripts package. The <command>*.rc</command>
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| 103 | scripts try to recover hotplug events that were lost during system
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| 104 | boot because, for example, the root filesystem was not mounted by
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| 105 | the kernel</para>
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| 106 | <indexterm zone="ch-system-hotplug hotplug-rc">
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| 107 | <primary sortas="d-/etc/hotplug/*.rc">/etc/hotplug/*.rc</primary>
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| 108 | </indexterm>
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| 109 | </listitem>
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| 110 | </varlistentry>
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| 111 |
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| 112 | <varlistentry id="hotplug-agent">
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| 113 | <term><command>/etc/hotplug/*.agent</command></term>
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| 114 | <listitem>
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| 115 | <para>These scripts are called by <command>hotplug</command> in
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| 116 | response to different types of hotplug events generated by the
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| 117 | kernel. Their action is to insert corresponding kernel modules
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| 118 | and call any user-provided scripts</para>
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| 119 | <indexterm zone="ch-system-hotplug hotplug-agent">
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| 120 | <primary sortas="d-/etc/hotplug/*.agent">/etc/hotplug/*.agent</primary>
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| 121 | </indexterm>
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| 122 | </listitem>
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| 123 | </varlistentry>
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| 124 |
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| 125 | <varlistentry id="hotplug-blacklist">
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| 126 | <term><filename>/etc/hotplug/blacklist</filename></term>
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| 127 | <listitem>
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| 128 | <para>This file contains the list of modules that should never be
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| 129 | inserted into the kernel by the Hotplug scripts</para>
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| 130 | <indexterm zone="ch-system-hotplug hotplug-blacklist">
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| 131 | <primary
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| 132 | sortas="e-/etc/hotplug/blacklist">/etc/hotplug/blacklist</primary>
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| 133 | </indexterm>
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| 134 | </listitem>
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| 135 | </varlistentry>
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| 136 |
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| 137 | <varlistentry id="hotplug-functions">
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| 138 | <term><filename>/etc/hotplug/hotplug.functions</filename></term>
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| 139 | <listitem>
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| 140 | <para>This file contains common functions used by other scripts in
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| 141 | the Hotplug package</para>
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| 142 | <indexterm zone="ch-system-hotplug hotplug-functions">
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| 143 | <primary
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| 144 | sortas="e-/etc/hotplug/hotplug.functions">/etc/hotplug/hotplug.functions</primary>
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| 145 | </indexterm>
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| 146 | </listitem>
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| 147 | </varlistentry>
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| 148 |
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| 149 | <varlistentry id="hotplug-subdirs">
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| 150 | <term><filename class="directory">/etc/hotplug/{pci,usb}</filename></term>
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| 151 | <listitem>
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| 152 | <para>These directories contain user-written handlers for hotplug
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| 153 | events</para>
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| 154 | <indexterm zone="ch-system-hotplug hotplug-subdirs">
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| 155 | <primary
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| 156 | sortas="e-/etc/hotplug/{pci,usb}">/etc/hotplug/{pci,usb}</primary>
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| 157 | </indexterm>
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| 158 | </listitem>
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| 159 | </varlistentry>
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| 160 |
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| 161 | <varlistentry id="hotplug-usb.usermap">
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| 162 | <term><filename>/etc/hotplug/usb.usermap</filename></term>
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| 163 | <listitem>
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| 164 | <para>This file contains rules that determine which user-defined
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| 165 | handlers to call for each USB device, based on its vendor ID and
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| 166 | other attributes</para>
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| 167 | <indexterm zone="ch-system-hotplug hotplug-usb.usermap">
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| 168 | <primary
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| 169 | sortas="e-/etc/hotplug/usb.usermap">/etc/hotplug/usb.usermap</primary>
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| 170 | </indexterm>
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| 171 | </listitem>
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| 172 | </varlistentry>
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| 173 |
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| 174 | <varlistentry id="hotplug-hotplug.d">
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| 175 | <term><filename class="directory">/etc/hotplug.d</filename></term>
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| 176 | <listitem>
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| 177 | <para>This directory contains programs (or symlinks to them) that
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| 178 | are interested in receiving hotplug events. For example,
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| 179 | Udev puts its symlink here during installation</para>
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| 180 | <indexterm zone="ch-system-hotplug hotplug-hotplug.d">
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| 181 | <primary sortas="e-/etc/hotplug.d">/etc/hotplug.d</primary>
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| 182 | </indexterm>
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| 183 | </listitem>
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| 184 | </varlistentry>
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| 185 |
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| 186 | <varlistentry id="hotplug-firmware">
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| 187 | <term><filename class="directory">/lib/firmware</filename></term>
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| 188 | <listitem>
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| 189 | <para>This directory contains the firmware for devices that need
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| 190 | to have their firmware loaded before use</para>
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| 191 | <indexterm zone="ch-system-hotplug hotplug-firmware">
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| 192 | <primary sortas="e-/lib/firmware">/lib/firmware</primary>
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| 193 | </indexterm>
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| 194 | </listitem>
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| 195 | </varlistentry>
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| 196 |
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| 197 | <varlistentry id="hotplug-events">
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| 198 | <term><filename>/var/log/hotplug/events</filename></term>
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| 199 | <listitem>
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| 200 | <para>This file contains all the events that <command>hotplug</command>
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| 201 | has called since bootup</para>
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| 202 | <indexterm zone="ch-system-hotplug hotplug-events">
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| 203 | <primary
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| 204 | sortas="e-/var/log/hotplug/events">/var/log/hotplug/events</primary>
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| 205 | </indexterm>
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| 206 | </listitem>
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| 207 | </varlistentry>
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| 208 |
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| 209 | </variablelist>
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| 210 |
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| 211 | </sect2>
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| 212 |
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| 213 | </sect1>
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