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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.5//EN"
"http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
<!ENTITY % general-entities SYSTEM "../general.ent">
%general-entities;
]>
<sect1 id="ch-system-eudev" role="wrap" revision="sysv">
<?dbhtml filename="eudev.html"?>
<sect1info condition="script">
<productname>eudev</productname>
<productnumber>&eudev-version;</productnumber>
<address>&eudev-url;</address>
</sect1info>
<title>Eudev-&eudev-version;</title>
<indexterm zone="ch-system-eudev">
<primary sortas="a-Eudev">Eudev</primary>
</indexterm>
<sect2 role="package">
<title/>
<para>The Eudev package contains programs for dynamic creation of device
nodes.</para>
<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem>
<seg>&eudev-fin-sbu;</seg>
<seg>&eudev-fin-du;</seg>
</seglistitem>
</segmentedlist>
</sect2>
<sect2 role="installation">
<title>Installation of Eudev</title>
<!-- No longer seems needed. bdubbs 5/18/23
<para>First fix the location of udev rules in the .pc file:</para>
<screen><userinput remap="pre">sed -i '/udevdir/a udev_dir=${udevdir}' src/udev/udev.pc.in</userinput></screen>
-->
<!-- different from systemd: we do not have a render group and file is
named differently -->
<para>Remove an unneeded group
<systemitem class="groupname">sgx</systemitem>, from the default udev
rules:</para>
<screen><userinput remap="pre">sed -i -e 's/GROUP="sgx", //' rules/50-udev-default.rules</userinput></screen>
<para>Prepare Eudev for compilation:</para>
<screen><userinput remap="configure">./configure --prefix=/usr \
--bindir=/usr/sbin \
--sysconfdir=/etc \
--enable-manpages \
--disable-static</userinput></screen>
<para>Compile the package:</para>
<screen><userinput remap="make">make</userinput></screen>
<para>Create some directories now that are needed for tests, but
will also be used as a part of installation:</para>
<screen><userinput remap="test">mkdir -pv /usr/lib/udev/rules.d
mkdir -pv /etc/udev/rules.d</userinput></screen>
<para>To test the results, issue:</para>
<screen><userinput remap="test">make check</userinput></screen>
<para>Install the package:</para>
<screen><userinput remap="install">make install</userinput></screen>
<para>Install some custom rules and support files useful in an LFS
environment:</para>
<screen><userinput remap="install">tar -xvf ../&udev-lfs-version;.tar.xz
make -f &udev-lfs-version;/Makefile.lfs install</userinput></screen>
</sect2>
<sect2 id="conf-eudev" role="configuration">
<title>Configuring Eudev</title>
<indexterm zone="conf-eudev">
<primary sortas="a-Eudev">Eudev</primary>
<secondary>configuring</secondary>
</indexterm>
<indexterm zone="conf-eudev">
<primary sortas="e-/etc/udev/rules.d/65-kvm.rules">/etc/udev/rules.d/65-kvm.rules</primary>
</indexterm>
<para>
The default udev rule installed by Eudev would allow all users to
access <filename class='devicefile'>/dev/kvm</filename>. The editors
consider it dangerous. Create a configuration file to override it:
</para>
<screen><userinput>cat > /etc/udev/rules.d/65-kvm.rules << "EOF"
<literal>KERNEL=="kvm", GROUP="kvm", MODE="0660", TAG+="uaccess"</literal>
EOF</userinput></screen>
<indexterm zone="conf-eudev">
<primary sortas="e-/etc/udev/hwdb.bin">/etc/udev/hwdb.bin</primary>
</indexterm>
<para>Information about hardware devices is maintained in the
<filename class="directory">/etc/udev/hwdb.d</filename> and
<filename class="directory">/usr/lib/udev/hwdb.d</filename> directories.
<application>Eudev</application> needs that information to be compiled
into a binary database <filename>/etc/udev/hwdb.bin</filename>. Create the
initial database:</para>
<screen><userinput>udevadm hwdb --update</userinput></screen>
<para>This command needs to be run each time the hardware information is
updated.</para>
</sect2>
<sect2 id="contents-eudev" role="content">
<title>Contents of Eudev</title>
<segmentedlist>
<segtitle>Installed programs</segtitle>
<segtitle>Installed libraries</segtitle>
<segtitle>Installed directories</segtitle>
<seglistitem>
<seg><!-- These are in /usr/lib/udev and not to be called by the user:
accelerometer, ata_id, cdrom_id, collect, mtd_probe,
scsi_id, v4l_id,--> udevadm and udevd</seg>
<seg>libudev.so</seg>
<seg>/etc/udev, /usr/lib/udev, and /usr/share/doc/udev-&udev-lfs-version;</seg>
</seglistitem>
</segmentedlist>
<variablelist>
<bridgehead renderas="sect3">Short Descriptions</bridgehead>
<?dbfo list-presentation="list"?>
<?dbhtml list-presentation="table"?>
<varlistentry id="udevadm" revision="sysv">
<term><command>udevadm</command></term>
<listitem>
<para>Generic udev administration tool: controls the udevd daemon,
provides info from the Udev database, monitors uevents, waits for
uevents to finish, tests Udev configuration, and triggers uevents
for a given device</para>
<indexterm zone="ch-system-eudev udevadm">
<primary sortas="b-udevadm">udevadm</primary>
</indexterm>
</listitem>
</varlistentry>
<varlistentry id="udevd">
<term><command>udevd</command></term>
<listitem>
<para>A daemon that listens for uevents on the netlink socket,
creates devices and runs the configured external programs in
response to these uevents</para>
<indexterm zone="ch-system-eudev udevd">
<primary sortas="b-udevd">udevd</primary>
</indexterm>
</listitem>
</varlistentry>
<varlistentry id="libudev">
<term><filename class="libraryfile">libudev</filename></term>
<listitem>
<para>A library interface to udev device information</para>
<indexterm zone="ch-system-eudev libudev">
<primary sortas="c-libudev">libudev</primary>
</indexterm>
</listitem>
</varlistentry>
<varlistentry id="etc-udev">
<term><filename class="directory">/etc/udev</filename></term>
<listitem>
<para>Contains Udev configuration files,
device permissions, and rules for device naming</para>
<indexterm zone="ch-system-eudev etc-udev">
<primary sortas="e-/etc/udev">/etc/udev</primary>
</indexterm>
</listitem>
</varlistentry>
</variablelist>
</sect2>
</sect1>
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