source: chapter06/udev.xml@ b812d0f

Last change on this file since b812d0f was b812d0f, checked in by Archaic <archaic@…>, 18 years ago

Create the Udev directories before creating the symlinks.

git-svn-id: ​http://svn.linuxfromscratch.org/LFS/branches/udev_update/BOOK@7401 4aa44e1e-78dd-0310-a6d2-fbcd4c07a689
  • Property mode set to 100644
File size: 10.5 KB
Line 
1<?xml version="1.0" encoding="ISO-8859-1"?>
2<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
3 "http://www.oasis-open.org/docbook/xml/4.4/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 <segmentedlist>
24 <segtitle>&buildtime;</segtitle>
25 <segtitle>&diskspace;</segtitle>
26
27 <seglistitem>
28 <seg>0.1 SBU</seg>
29 <seg>3.1 MB</seg>
30 </seglistitem>
31 </segmentedlist>
32
33 <segmentedlist>
34 <segtitle>&dependencies;</segtitle>
35
36 <seglistitem>
37 <seg>Coreutils and Make</seg>
38 </seglistitem>
39 </segmentedlist>
40
41 </sect2>
42
43 <sect2 role="installation">
44 <title>Installation of Udev</title>
45
46 <para>Create some devices and directories that Udev cannot handle due to
47 them being required very early in the boot process:</para>
48
49<screen><userinput>install -dv /lib/{firmware,udev/devices/{pts,shm}}
50ln -sv /proc/self/fd /lib/udev/devices/fd
51ln -sv /proc/self/fd/0 /lib/udev/devices/stdin
52ln -sv /proc/self/fd/1 /lib/udev/devices/stdout
53ln -sv /proc/self/fd/2 /lib/udev/devices/stderr
54ln -sv /proc/kcore /lib/udev/devices/core</userinput></screen>
55
56 <para>Compile the package:</para>
57
58<screen><userinput>make \
59EXTRAS="extras/ata_id extras/cdrom_id extras/edd_id extras/firmware extras/floppy extras/scsi_id extras/usb_id extras/volume_id"</userinput></screen>
60
61 <variablelist>
62 <title>The meaning of the make option:</title>
63
64 <varlistentry>
65 <term><parameter>EXTRAS=...</parameter></term>
66 <listitem>
67 <para>This builds several helper binaries that can aid in writing custom
68 Udev rules.</para>
69 </listitem>
70 </varlistentry>
71
72 </variablelist>
73
74 <para>To test the results, issue:
75 <userinput>make test</userinput>.</para>
76
77 <para>Install the package:</para>
78
79<screen><userinput>make DESTDIR=/ \
80EXTRAS="extras/ata_id extras/cdrom_id extras/edd_id extras/firmware extras/floppy extras/scsi_id extras/usb_id extras/volume_id" \
81install</userinput></screen>
82
83 <variablelist>
84 <title>The meaning of the make parameter:</title>
85
86 <varlistentry>
87 <term><parameter>DESTDIR=/</parameter></term>
88 <listitem>
89 <para>This prevents the Udev build process from killing any
90 <command>udevd</command> processes that may be running on the
91 host system.</para>
92 </listitem>
93 </varlistentry>
94
95 </variablelist>
96
97 <para>Udev's configuration is far from ideal by default, so install
98 the configuration files here:</para>
99
100<screen><userinput>cp -v ../&udev-config-file; /etc/udev/rules.d/25-lfs.rules</userinput></screen>
101
102 <para>Alter Udev's configuration file so that Udev can automatically
103 load kernel modules.</para>
104
105<screen><userinput>sed -i 147,150d /etc/udev/rules.d/25-lfs.rules
106cat &gt;&gt; /etc/udev/rules.d/25-lfs.rules &lt;&lt; "EOF"
107# Rules to allow hotplugging of devices with modular drivers
108ACTION=="add", SUBSYSTEM=="?*", ENV{MODALIAS}=="?*", \
109 RUN+="/sbin/modprobe $env{MODALIAS}"
110ACTION=="add", SUBSYSTEM=="scsi", SYSFS{type}=="[07]", \
111 RUN+="/sbin/modprobe sd_mod"
112EOF</userinput></screen>
113
114 <para>Install the documentation that explains how to create Udev rules:</para>
115
116<screen><userinput>install -m644 -D -v docs/writing_udev_rules/index.html /usr/share/doc/udev-&udev-version;/index.html</userinput></screen>
117
118 <!-- Not for the LiveCD -->
119 <!-- Edit Me -->
120
121 <para>Run the <command>udevstart</command> program to create our full
122 complement of device nodes.</para>
123
124<screen><userinput>/sbin/udevstart</userinput></screen>
125
126 </sect2>
127
128 <sect2 id="contents-udev" role="content">
129 <title>Contents of Udev</title>
130
131 <segmentedlist>
132 <segtitle>Installed programs</segtitle>
133 <segtitle>Installed directory</segtitle>
134
135 <seglistitem>
136 <seg>ata_id, cdrom_id, create_floppy_devices, edd_id, firmware_helper,
137 scsi_id, udevcontrol, udevd, udevinfo, udevmonitor, udevtest, usb_id
138 and vol_id</seg>
139 <seg>/etc/udev</seg>
140 </seglistitem>
141 </segmentedlist>
142
143 <variablelist>
144 <bridgehead renderas="sect3">Short Descriptions</bridgehead>
145 <?dbfo list-presentation="list"?>
146 <?dbhtml list-presentation="table"?>
147
148 <varlistentry id="ata_id">
149 <term><command>ata_id</command></term>
150 <listitem>
151 <para>Provides <command>udev</command> with a unique string and
152 additional information (uuid, label) for an ATA drive</para>
153 <indexterm zone="ch-system-udev ata_id">
154 <primary sortas="b-ata_id">ata_id</primary>
155 </indexterm>
156 </listitem>
157 </varlistentry>
158
159 <varlistentry id="cdrom_id">
160 <term><command>cdrom_id</command></term>
161 <listitem>
162 <para>Provides <command>udev</command> with the capabilities of a
163 CD-ROM or DVD-ROM drive</para>
164 <indexterm zone="ch-system-udev cdrom_id">
165 <primary sortas="b-cdrom_id">cdrom_id</primary>
166 </indexterm>
167 </listitem>
168 </varlistentry>
169
170 <varlistentry id="create_floppy_devices">
171 <term><command>create_floppy_devices</command></term>
172 <listitem>
173 <para>Creates all possible floppy devices based on the CMOS type</para>
174 <indexterm zone="ch-system-udev create_floppy_devices">
175 <primary sortas="b-create_floppy_devices">create_floppy_devices</primary>
176 </indexterm>
177 </listitem>
178 </varlistentry>
179
180 <varlistentry id="edd_id">
181 <term><command>edd_id</command></term>
182 <listitem>
183 <para>Provides <command>udev</command> with the EDD ID for a BIOS disk
184 drive</para>
185 <indexterm zone="ch-system-udev edd_id">
186 <primary sortas="b-edd_id">edd_id</primary>
187 </indexterm>
188 </listitem>
189 </varlistentry>
190
191 <varlistentry id="firmware_helper">
192 <term><command>firmware_helper</command></term>
193 <listitem>
194 <para>Enables <command>udev</command> to upload firmware to
195 devices</para>
196 <indexterm zone="ch-system-udev firmware_helper">
197 <primary sortas="b-firmware_helper">firmware_helper</primary>
198 </indexterm>
199 </listitem>
200 </varlistentry>
201
202 <varlistentry id="scsi_id">
203 <term><command>scsi_id</command></term>
204 <listitem>
205 <para>Provides <command>udev</command> with a unique SCSI identifier
206 based on the data returned from sending a SCSI INQUIRY command to
207 the specified device</para>
208 <indexterm zone="ch-system-udev scsi_id">
209 <primary sortas="b-scsi_id">scsi_id</primary>
210 </indexterm>
211 </listitem>
212 </varlistentry>
213
214 <varlistentry id="udevcontrol">
215 <term><command>udevcontrol</command></term>
216 <listitem>
217 <para>Configures a number of options for the running
218 <command>udevd</command> daemon, such as the log level.</para>
219 <indexterm zone="ch-system-udev udevcontrol">
220 <primary sortas="b-udevcontrol">udevcontrol</primary>
221 </indexterm>
222 </listitem>
223 </varlistentry>
224
225 <varlistentry id="udevd">
226 <term><command>udevd</command></term>
227 <listitem>
228 <para>A daemon that reorders hotplug events before submitting them to
229 <command>udev</command>, thus avoiding various race conditions</para>
230 <indexterm zone="ch-system-udev udevd">
231 <primary sortas="b-udevd">udevd</primary>
232 </indexterm>
233 </listitem>
234 </varlistentry>
235
236 <varlistentry id="udevinfo">
237 <term><command>udevinfo</command></term>
238 <listitem>
239 <para>Allows users to query the <command>udev</command> database for
240 information on any device currently present on the system; it also
241 provides a way to query any device in the <systemitem
242 class="filesystem">sysfs</systemitem> tree to help create udev
243 rules</para>
244 <indexterm zone="ch-system-udev udevinfo">
245 <primary sortas="b-udevinfo">udevinfo</primary>
246 </indexterm>
247 </listitem>
248 </varlistentry>
249
250 <varlistentry id="udevmonitor">
251 <term><command>udevmonitor</command></term>
252 <listitem>
253 <para>Prints the event received from the kernel and the event which
254 <command>udev</command> sends out after rule processing</para>
255 <indexterm zone="ch-system-udev udevmonitor">
256 <primary sortas="b-udevmonitor">udevmonitor</primary>
257 </indexterm>
258 </listitem>
259 </varlistentry>
260
261 <varlistentry id="udevtest">
262 <term><command>udevtest</command></term>
263 <listitem>
264 <para>Simulates a <command>udev</command> run for the given device,
265 and prints out the name of the node the real <command>udev</command>
266 would have created or (not in LFS) the name of the renamed network
267 interface</para>
268 <indexterm zone="ch-system-udev udevtest">
269 <primary sortas="b-udevtest">udevtest</primary>
270 </indexterm>
271 </listitem>
272 </varlistentry>
273
274 <varlistentry id="usb_id">
275 <term><command>usb_id</command></term>
276 <listitem>
277 <para>Provides <command>udev</command> with information about USB
278 devices</para>
279 <indexterm zone="ch-system-udev usb_id">
280 <primary sortas="b-usb_id">usb_id</primary>
281 </indexterm>
282 </listitem>
283 </varlistentry>
284
285 <varlistentry id="vol_id">
286 <term><command>vol_id</command></term>
287 <listitem>
288 <para>Provides <command>udev</command> with the label and uuid of a
289 filesystem</para>
290 <indexterm zone="ch-system-udev vol_id">
291 <primary sortas="b-vol_id">vol_id</primary>
292 </indexterm>
293 </listitem>
294 </varlistentry>
295
296 <varlistentry id="etc-udev">
297 <term><filename class="directory">/etc/udev</filename></term>
298 <listitem>
299 <para>Contains <command>udev</command> configuation files,
300 device permissions, and rules for device naming</para>
301 <indexterm zone="ch-system-udev etc-udev">
302 <primary sortas="e-/etc/udev">/etc/udev</primary>
303 </indexterm>
304 </listitem>
305 </varlistentry>
306
307 </variablelist>
308
309 </sect2>
310
311</sect1>
Note: See TracBrowser for help on using the repository browser.