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<?xml version="1.0" encoding="ISO-8859-1"?>
<!DOCTYPE sect1 PUBLIC "-//OASIS//DTD DocBook XML V4.4//EN"
"http://www.oasis-open.org/docbook/xml/4.4/docbookx.dtd" [
<!ENTITY % general-entities SYSTEM "../general.ent">
%general-entities;
]>
<sect1 id="ch-system-linux-headers" role="wrap">
<?dbhtml filename="linux-headers.html"?>
<title>Linux-Headers-&linux-version;</title>
<indexterm zone="ch-system-linux-headers">
<primary sortas="a-Linux-Headers">Linux-Headers</primary>
</indexterm>
<sect2 role="package">
<title/>
<para>The Linux-Headers expose the kernel's API for use by Glibc.</para>
<segmentedlist>
<segtitle>&buildtime;</segtitle>
<segtitle>&diskspace;</segtitle>
<seglistitem>
<seg>&linux-headers-ch6-sbu;</seg>
<seg>&linux-headers-ch6-du;</seg>
</seglistitem>
</segmentedlist>
</sect2>
<sect2 role="installation">
<title>Installation of Linux-Headers</title>
<para>The Linux kernel needs to expose an Application Programming Interface
(API) for the system's C library (Glibc in LFS) to utilize. This is done
by way of sanitizing various C header files that are shipped in the Linux
kernel source tarball.</para>
<para>Apply the following patch to provide <command>unifdef</command>, which
the installation of the kernel headers requires:</para>
<screen><userinput>patch -Np1 -i ../linux-&linux-version;-unifdef-1.patch</userinput></screen>
<para>Install the header files:</para>
<screen><userinput>make mrproper
make headers_check
make INSTALL_HDR_PATH=/usr headers_install</userinput></screen>
<para>Ensure that all the headers are owned by root:</para>
<screen><userinput>chown -Rv root:root /usr/include/{asm,linux}</userinput></screen>
<para>Make sure the users can read the headers:</para>
<screen><userinput>find /usr/include/{asm,linux} -type d -exec chmod -v 755 {} \;
find /usr/include/{asm,linux} -type f -exec chmod -v 644 {} \;</userinput></screen>
</sect2>
<sect2 id="contents-linux-headers" role="content">
<title>Contents of Linux-Headers</title>
<segmentedlist>
<segtitle>Installed headers</segtitle>
<seglistitem>
<seg>/usr/include/{asm,linux}/*.h</seg>
</seglistitem>
</segmentedlist>
<variablelist>
<bridgehead renderas="sect3">Short Descriptions</bridgehead>
<?dbfo list-presentation="list"?>
<?dbhtml list-presentation="table"?>
<varlistentry id="linux-headers">
<term><filename class="headerfile">/usr/include/{asm,linux}/*.h</filename></term>
<listitem>
<para>The Linux API headers</para>
<indexterm zone="ch-system-linux-headers linux-headers">
<primary sortas="e-/usr/include/{asm,linux}/*.h">/usr/include/{asm,linux}/*.h</primary>
</indexterm>
</listitem>
</varlistentry>
</variablelist>
</sect2>
</sect1>
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