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-udev" role="wrap">
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9 | <?dbhtml filename="udev.html"?>
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10 |
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11 | <title>Udev-&udev-version;</title>
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12 |
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13 | <indexterm zone="ch-system-udev">
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14 | <primary sortas="a-Udev">Udev</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 Udev package contains programs for dynamic creation of device
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21 | nodes.</para>
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22 |
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23 | <segmentedlist>
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24 | <segtitle>&buildtime;</segtitle>
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25 | <segtitle>&diskspace;</segtitle>
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26 |
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27 | <seglistitem>
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28 | <seg>0.1 SBU</seg>
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29 | <seg>3.8 MB</seg>
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30 | </seglistitem>
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31 | </segmentedlist>
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32 |
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33 | <segmentedlist>
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34 | <segtitle>&dependencies;</segtitle>
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35 |
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36 | <seglistitem>
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37 | <seg>Coreutils, GCC, Make, and Perl</seg>
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38 | </seglistitem>
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39 | </segmentedlist>
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40 |
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41 | </sect2>
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42 |
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43 | <sect2 role="installation">
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44 | <title>Installation of Udev</title>
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45 |
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46 | <para>Compile the package:</para>
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47 |
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48 | <screen><userinput>make EXTRAS=extras/run_directory</userinput></screen>
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49 |
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50 | <variablelist>
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51 | <title>The meaning of the make option:</title>
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52 |
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53 | <varlistentry>
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54 | <term><parameter>EXTRAS=extras/run_directory</parameter></term>
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55 | <listitem>
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56 | <para>This builds the <command>udev_run_devd</command> and
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57 | <command>udev_run_hotplugd</command> binaries, which are required
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58 | for correct handling of hotpluggable devices.</para>
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59 | </listitem>
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60 | </varlistentry>
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61 |
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62 | </variablelist>
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63 |
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64 | <para>To test the results, issue:
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65 | <userinput>make test</userinput>.</para>
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66 |
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67 | <para>Install the package:</para>
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68 |
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69 | <screen><userinput>make DESTDIR=/ EXTRAS=extras/run_directory install</userinput></screen>
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70 |
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71 | <variablelist>
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72 | <title>The meaning of the make parameter:</title>
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73 |
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74 | <varlistentry>
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75 | <term><parameter>DESTDIR=/</parameter></term>
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76 | <listitem>
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77 | <para>This prevents the Udev build process from killing any
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78 | <command>udevd</command> processes that may be running on the
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79 | host system.</para>
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80 | </listitem>
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81 | </varlistentry>
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82 |
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83 | </variablelist>
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84 |
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85 | <para>Udev's configuration is far from ideal by default, so install
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86 | the configuration files here:</para>
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87 |
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88 | <screen><userinput>cp -v ../&udev-config-file; /etc/udev/rules.d/25-lfs.rules</userinput></screen>
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89 |
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90 | <para>Install the documentation that explains how to create Udev rules:</para>
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91 |
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92 | <screen><userinput>install -m644 -D -v docs/writing_udev_rules/index.html /usr/share/doc/udev-&udev-version;/index.html</userinput></screen>
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93 |
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94 | <!-- Not for the LiveCD -->
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95 | <!-- Edit Me -->
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96 | <para>Run the <command>udevstart</command> program to create our full
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97 | complement of device nodes.</para>
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98 |
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99 | <screen><userinput>/sbin/udevstart</userinput></screen>
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100 |
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101 | </sect2>
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102 |
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103 | <sect2 id="contents-udev" role="content">
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104 | <title>Contents of Udev</title>
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105 |
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106 | <segmentedlist>
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107 | <segtitle>Installed programs</segtitle>
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108 | <segtitle>Installed directory</segtitle>
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109 |
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110 | <seglistitem>
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111 | <seg>udev, udev_run_devd, udev_run_hotplugd, udevcontrol, udevd,
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112 | udevinfo, udevmonitor, udevsend, udevstart, and udevtest</seg>
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113 | <seg>/etc/udev</seg>
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114 | </seglistitem>
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115 | </segmentedlist>
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116 |
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117 | <variablelist>
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118 | <bridgehead renderas="sect3">Short Descriptions</bridgehead>
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119 | <?dbfo list-presentation="list"?>
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120 | <?dbhtml list-presentation="table"?>
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121 |
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122 | <varlistentry id="udev">
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123 | <term><command>udev</command></term>
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124 | <listitem>
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125 | <para>Creates device nodes in <filename class="directory">/dev</filename>
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126 | or renames network interfaces (not in LFS) in response to hotplug
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127 | events</para>
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128 | <indexterm zone="ch-system-udev udev">
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129 | <primary sortas="b-udev">udev</primary>
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130 | </indexterm>
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131 | </listitem>
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132 | </varlistentry>
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133 |
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134 | <varlistentry id="udev_run_devd">
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135 | <term><command>udev_run_devd</command></term>
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136 | <listitem>
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137 | <para>Executes programs and scripts in the <filename
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138 | class="directory">/etc/dev.d/</filename> directory in response to
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139 | hotplug events</para>
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140 | <indexterm zone="ch-system-udev udev_run_devd">
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141 | <primary sortas="b-udev_run_devd">udev_run_devd</primary>
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142 | </indexterm>
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143 | </listitem>
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144 | </varlistentry>
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145 |
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146 | <varlistentry id="udev_run_hotplugd">
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147 | <term><command>udev_run_hotplugd</command></term>
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148 | <listitem>
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149 | <para>Executes programs and scripts in the <filename
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150 | class="directory">/etc/hotplug.d/</filename> directory in response
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151 | to hotplug events</para>
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152 | <indexterm zone="ch-system-udev udev_run_hotplugd">
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153 | <primary sortas="b-udev_run_hotplugd">udev_run_hotplugd</primary>
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154 | </indexterm>
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155 | </listitem>
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156 | </varlistentry>
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157 |
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158 | <varlistentry id="udevcontrol">
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159 | <term><command>udevcontrol</command></term>
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160 | <listitem>
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161 | <para>Configures a number of options for the running
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162 | <command>udevd</command> daemon, such as the log level.</para>
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163 | <indexterm zone="ch-system-udev udevcontrol">
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164 | <primary sortas="b-udevcontrol">udevcontrol</primary>
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165 | </indexterm>
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166 | </listitem>
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167 | </varlistentry>
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168 |
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169 | <varlistentry id="udevd">
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170 | <term><command>udevd</command></term>
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171 | <listitem>
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172 | <para>A daemon that reorders hotplug events before submitting them to
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173 | <command>udev</command>, thus avoiding various race conditions</para>
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174 | <indexterm zone="ch-system-udev udevd">
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175 | <primary sortas="b-udevd">udevd</primary>
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176 | </indexterm>
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177 | </listitem>
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178 | </varlistentry>
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179 |
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180 | <varlistentry id="udevinfo">
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181 | <term><command>udevinfo</command></term>
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182 | <listitem>
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183 | <para>Allows users to query the <command>udev</command> database for
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184 | information on any device currently present on the system; it also
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185 | provides a way to query any device in the <systemitem
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186 | class="filesystem">sysfs</systemitem> tree to help create udev
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187 | rules</para>
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188 | <indexterm zone="ch-system-udev udevinfo">
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189 | <primary sortas="b-udevinfo">udevinfo</primary>
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190 | </indexterm>
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191 | </listitem>
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192 | </varlistentry>
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193 |
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194 | <varlistentry id="udevmonitor">
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195 | <term><command>udevmonitor</command></term>
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196 | <listitem>
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197 | <para>Prints the event received from the kernel and the event which
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198 | <command>udev</command> sends out after rule processing</para>
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199 | <indexterm zone="ch-system-udev udevmonitor">
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200 | <primary sortas="b-udevmonitor">udevmonitor</primary>
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201 | </indexterm>
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202 | </listitem>
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203 | </varlistentry>
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204 |
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205 | <varlistentry id="udevsend">
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206 | <term><command>udevsend</command></term>
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207 | <listitem>
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208 | <para>Delivers hotplug events to <command>udevd</command></para>
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209 | <indexterm zone="ch-system-udev udevsend">
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210 | <primary sortas="b-udevsend">udevsend</primary>
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211 | </indexterm>
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212 | </listitem>
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213 | </varlistentry>
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214 |
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215 | <varlistentry id="udevstart">
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216 | <term><command>udevstart</command></term>
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217 | <listitem>
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218 | <para>Creates device nodes in <filename class="directory">/dev</filename>
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219 | that correspond to drivers compiled directly into the kernel; it
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220 | performs that task by simulating hotplug events presumably dropped by
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221 | the kernel before invocation of this program (e.g., because the root
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222 | filesystem has not been mounted) and submitting such synthetic hotplug
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223 | events to <command>udev</command></para>
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224 | <indexterm zone="ch-system-udev udevstart">
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225 | <primary sortas="b-udevstart">udevstart</primary>
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226 | </indexterm>
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227 | </listitem>
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228 | </varlistentry>
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229 |
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230 | <varlistentry id="udevtest">
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231 | <term><command>udevtest</command></term>
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232 | <listitem>
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233 | <para>Simulates a <command>udev</command> run for the given device,
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234 | and prints out the name of the node the real <command>udev</command>
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235 | would have created or (not in LFS) the name of the renamed network
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236 | interface</para>
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237 | <indexterm zone="ch-system-udev udevtest">
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238 | <primary sortas="b-udevtest">udevtest</primary>
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239 | </indexterm>
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240 | </listitem>
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241 | </varlistentry>
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242 |
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243 | <varlistentry id="etc-udev">
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244 | <term><filename class="directory">/etc/udev</filename></term>
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245 | <listitem>
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246 | <para>Contains <command>udev</command> configuation files,
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247 | device permissions, and rules for device naming</para>
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248 | <indexterm zone="ch-system-udev etc-udev">
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249 | <primary sortas="e-/etc/udev">/etc/udev</primary>
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250 | </indexterm>
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251 | </listitem>
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252 | </varlistentry>
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253 |
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254 | </variablelist>
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255 |
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256 | </sect2>
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257 |
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258 | </sect1>
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