source: BOOK/final-system/common/udev.xml@ 1f9faab

clfs-3.0.0-systemd clfs-3.0.0-sysvinit systemd sysvinit
Last change on this file since 1f9faab was 2572b8e, checked in by Joe Ciccone <jciccone@…>, 14 years ago

Create the required device nodes on the udev page instead of relying
on the bootscripts to create them.
  • Property mode set to 100644
File size: 9.6 KB
Line 
1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
3 "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
4 <!ENTITY % general-entities SYSTEM "../../general.ent">
5 %general-entities;
6]>
7
8<sect1 id="ch-system-udev" role="wrap">
9 <?dbhtml filename="udev.html"?>
10
11 <title>Udev-&udev-version;</title>
12
13 <indexterm zone="ch-system-udev">
14 <primary sortas="a-Udev">Udev</primary>
15 </indexterm>
16
17 <sect2 role="package">
18 <title/>
19
20 <para>The Udev package contains programs for dynamic creation of device
21 nodes.</para>
22
23 </sect2>
24
25 <sect2 role="installation">
26 <title>Installation of Udev</title>
27
28 <para os="a">Prepare Udev for compilation:</para>
29
30<screen os="b"><userinput>./configure --prefix=/usr \
31 --exec-prefix="" --sysconfdir=/etc \
32 --sbindir=/sbin --libexecdir=/lib/udev \
33 --libdir=/usr/lib --with-systemdsystemunitdir=/lib/systemd/system \
34 --disable-extras --disable-introspection</userinput></screen>
35
36 <para os="c">Compile the package:</para>
37
38<screen os="d"><userinput>make</userinput></screen>
39
40 <para os="g">Install the package:</para>
41
42<screen os="h"><userinput>make install</userinput></screen>
43
44 <para os="i">Create a directory for storing firmware that can be
45 loaded by <command>udev</command>:</para>
46
47<screen os="j"><userinput>install -dv /lib/firmware</userinput></screen>
48
49 </sect2>
50
51 <sect2 id="conf-udev" role="configuration">
52 <title>Configuring Udev</title>
53
54 <para>When systemd starts a tmpfs filesystem is mounted over
55 <filename class="directory">/dev</filename> and the previous entries are
56 no-longer available. The folling command creates files that are copied
57 over when udevd starts:</para>
58
59<screen><userinput>mkdir -pv /lib/udev/devices/{pts,shm}
60mknod -m 0600 /lib/udev/devices/console c 5 1
61mknod -m 0666 /lib/udev/devices/null c 1 3
62mknod -m 0666 /lib/udev/devices/zero c 1 5
63mknod -m 0600 /lib/udev/devices/kmsg c 1 11
64ln -snvf /proc/self/fd /lib/udev/devices/fd
65ln -snvf /proc/self/fd/0 /lib/udev/devices/stdin
66ln -snvf /proc/self/fd/1 /lib/udev/devices/stdout
67ln -snvf /proc/self/fd/2 /lib/udev/devices/stderr
68ln -snvf /proc/kcore /lib/udev/devices/core</userinput></screen>
69
70 </sect2>
71
72 <sect2 id="contents-udev" role="content">
73 <title>Contents of Udev</title>
74
75 <segmentedlist>
76 <segtitle>Installed programs</segtitle>
77 <segtitle>Installed library</segtitle>
78 <segtitle>Installed directories</segtitle>
79
80 <seglistitem>
81 <seg>ata_id, cdrom_id, collect, create_floppy_devices, edd_id,
82 firmware.sh, fstab_import, path_id, scsi_id, udevadm, udevd, usb_id,
83 v4l_id, write_cd_rules, write_net_rules</seg>
84 <seg>libudev</seg>
85 <seg>/etc/udev, /lib/firmware, /lib/udev, /usr/share/doc/udev</seg>
86 </seglistitem>
87 </segmentedlist>
88
89 <variablelist>
90 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
91 <?dbfo list-presentation="list"?>
92 <?dbhtml list-presentation="table"?>
93
94 <varlistentry id="udevadm">
95 <term><command>udevadm</command></term>
96 <listitem>
97 <para>Controls the runtime behavior of Udev, requests kernel
98 events, manages the event queue, and provides simple debugging.</para>
99 <indexterm zone="ch-system-udev udevadm">
100 <primary sortas="b-udevadm">udevadm</primary>
101 </indexterm>
102 </listitem>
103 </varlistentry>
104
105 <varlistentry id="udevd">
106 <term><command>udevd</command></term>
107 <listitem>
108 <para>A daemon that reorders hotplug events before submitting them to
109 <command>udev</command>,
110 thus avoiding various race conditions</para>
111 <indexterm zone="ch-system-udev udevd">
112 <primary sortas="b-udevd">udevd</primary>
113 </indexterm>
114 </listitem>
115 </varlistentry>
116
117 <!-- Start of Helpers -->
118 <varlistentry id="ata_id">
119 <term><command>ata_id</command></term>
120 <listitem>
121 <para>Provides Udev with a unique string and additional
122 information (uuid, label) for an ATA drive</para>
123 <indexterm zone="ch-system-udev ata_id">
124 <primary sortas="b-ata_id">ata_id</primary>
125 </indexterm>
126 </listitem>
127 </varlistentry>
128
129 <varlistentry id="cdrom_id">
130 <term><command>cdrom_id</command></term>
131 <listitem>
132 <para>Prints the capabilities of a CDROM or DVDROM drive.</para>
133 <indexterm zone="ch-system-udev cdrom_id">
134 <primary sortas="b-cdrom_id">cdrom_id</primary>
135 </indexterm>
136 </listitem>
137 </varlistentry>
138
139 <varlistentry id="collect">
140 <term><command>collect</command></term>
141 <listitem>
142 <para>DESCRIPTION REQUIRED</para>
143 <indexterm zone="ch-system-udev collect">
144 <primary sortas="b-collect">collect</primary>
145 </indexterm>
146 </listitem>
147 </varlistentry>
148
149 <varlistentry id="create_floppy_devices">
150 <term><command>create_floppy_devices</command></term>
151 <listitem>
152 <para>Creates all possible floppy devices based on the CMOS type</para>
153 <indexterm zone="ch-system-udev create_floppy_devices">
154 <primary sortas="b-create_floppy_devices">create_floppy_devices</primary>
155 </indexterm>
156 </listitem>
157 </varlistentry>
158
159 <varlistentry id="edd_id">
160 <term><command>edd_id</command></term>
161 <listitem>
162 <para>Identifies x86 disk drives from Enhanced Disk Drive calls</para>
163 <indexterm zone="ch-system-udev edd_id">
164 <primary sortas="b-edd_id">edd_id</primary>
165 </indexterm>
166 </listitem>
167 </varlistentry>
168
169 <varlistentry id="firmware.sh">
170 <term><command>firmware.sh</command></term>
171 <listitem>
172 <para>Script to load firmware for a device</para>
173 <indexterm zone="ch-system-udev firmware.sh">
174 <primary sortas="b-firmware.sh">firmware.sh</primary>
175 </indexterm>
176 </listitem>
177 </varlistentry>
178
179 <varlistentry id="fstab_import">
180 <term><command>fstab_import</command></term>
181 <listitem>
182 <para>DESCRIPTION REQUIRED</para>
183 <indexterm zone="ch-system-udev fstab_import">
184 <primary sortas="b-fstab_import">fstab_import</primary>
185 </indexterm>
186 </listitem>
187 </varlistentry>
188
189 <varlistentry id="path_id">
190 <term><command>path_id</command></term>
191 <listitem>
192 <para>Provides the shortest possible unique hardware path to a
193 device</para>
194 <indexterm zone="ch-system-udev path_id">
195 <primary sortas="b-path_id">path_id</primary>
196 </indexterm>
197 </listitem>
198 </varlistentry>
199
200 <varlistentry id="scsi_id">
201 <term><command>scsi_id</command></term>
202 <listitem>
203 <para>Retrieves or generates a unique SCSI identifier.</para>
204 <indexterm zone="ch-system-udev scsi_id">
205 <primary sortas="b-scsi_id">scsi_id</primary>
206 </indexterm>
207 </listitem>
208 </varlistentry>
209
210 <varlistentry id="usb_id">
211 <term><command>usb_id</command></term>
212 <listitem>
213 <para>Identifies a USB block device.</para>
214 <indexterm zone="ch-system-udev usb_id">
215 <primary sortas="b-usb_id">usb_id</primary>
216 </indexterm>
217 </listitem>
218 </varlistentry>
219
220 <varlistentry id="v4l_id">
221 <term><command>v4l_id</command></term>
222 <listitem>
223 <para>DESCRIPTION REQUIRED</para>
224 <indexterm zone="ch-system-udev v4l_id">
225 <primary sortas="b-v4l_id">v4l_id</primary>
226 </indexterm>
227 </listitem>
228 </varlistentry>
229
230 <varlistentry id="write_cd_rules">
231 <term><command>write_cd_rules</command></term>
232 <listitem>
233 <para>DESCRIPTION REQUIRED</para>
234 <indexterm zone="ch-system-udev write_cd_rules">
235 <primary sortas="b-write_cd_rules">write_cd_rules</primary>
236 </indexterm>
237 </listitem>
238 </varlistentry>
239
240 <varlistentry id="write_net_rules">
241 <term><command>write_net_rules</command></term>
242 <listitem>
243 <para>DESCRIPTION REQUIRED</para>
244 <indexterm zone="ch-system-udev write_net_rules">
245 <primary sortas="b-write_net_rules">write_net_rules</primary>
246 </indexterm>
247 </listitem>
248 </varlistentry>
249<!-- End of Helpers -->
250
251 <varlistentry id="libudev">
252 <term><filename class="libraryfile">libudev</filename></term>
253 <listitem>
254 <para>DESCRIPTION REQUIRED</para>
255 <indexterm zone="ch-system-udev libudev">
256 <primary sortas="c-libudev">libudev</primary>
257 </indexterm>
258 </listitem>
259 </varlistentry>
260
261 <varlistentry id="etc-udev">
262 <term><filename class="directory">/etc/udev</filename></term>
263 <listitem>
264 <para>Contains <command>udev</command> configuration files,
265 device permissions, and rules for device naming</para>
266 <indexterm zone="ch-system-udev etc-udev">
267 <primary sortas="e-/etc/udev">/etc/udev</primary>
268 </indexterm>
269 </listitem>
270 </varlistentry>
271
272 <varlistentry id="lib-udev">
273 <term><filename class="directory">/lib/udev</filename></term>
274 <listitem>
275 <para>Contains <command>udev</command> helper programs
276 and static devices which get copied to /dev when booted.</para>
277 <indexterm zone="ch-system-udev lib-udev">
278 <primary sortas="e-/lib/udev">/lib/udev</primary>
279 </indexterm>
280 </listitem>
281 </varlistentry>
282 </variablelist>
283
284 </sect2>
285
286</sect1>
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