source: BOOK/final-system/common/linux-headers.xml@ 195f497

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<sect1 id="ch-system-linux-headers" role="wrap">
  <?dbhtml filename="linux-headers.html"?>

  <title>Linux-Headers-&linux-version2;</title>

  <indexterm zone="ch-system-linux-headers">
    <primary sortas="a-Linux-Headers">Linux-Headers</primary>
  </indexterm>

  <sect2 role="package">
    <title/>

    <para>The Linux Kernel contains a make target that installs
    <quote>sanitized</quote> kernel headers.</para>

  </sect2>

  <sect2 role="installation">
    <title>Installation of Linux-Headers</title>

    <note os="a">
      <para>There is no actual package called "Linux-Headers" in this book.
      This step involves "sanitizing" and installing a number of header files
      from the Linux kernel source so that they can used by other packages.
      Therefore, for this step you will need to unpack the kernel tarball
      (<filename>linux-&linux-version;.tar.xz</filename>) and
      <command>cd</command> into its source
      directory before entering the commands on this page.</para>
    </note>

    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
    href="../../bootable/x86/kernel.xml"
    xpointer="xpointer(//*[@os='p1'])"/>

    <xi:include xmlns:xi="http://www.w3.org/2001/XInclude"
    href="../../bootable/x86/kernel.xml"
    xpointer="xpointer(//*[@os='p2'])"/>

    <para os="b">Install the kernel header files:</para>

<screen os="c"><userinput>make mrproper
make headers_check
make INSTALL_HDR_PATH=/usr headers_install
find /usr/include -name .install -or -name ..install.cmd | xargs rm -fv</userinput></screen>

    <variablelist os="d">
      <title>The meaning of the make commands:</title>

      <varlistentry os="d1">
        <term><parameter>make mrproper</parameter></term>
        <listitem>
          <para>Ensures that the kernel source dir is clean.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="d2">
        <term><parameter>make headers_check</parameter></term>
        <listitem>
          <para>Sanitizes the raw kernel headers so that they can be used
          by userspace programs.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="d3">
        <term><parameter>make INSTALL_HDR_PATH=/usr headers_install</parameter></term>
        <listitem>
          <para>This will install the kernel headers into
          <filename class="directory">/usr/include</filename>.</para>
        </listitem>
      </varlistentry>

      <varlistentry os="d4">
        <term><parameter>find /usr/include -name .install -or -name ..install.cmd | xargs rm -fv</parameter></term>
        <listitem>
          <para>Removes a number of unneeded debugging files that were installed.</para>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

  <sect2 id="contents-linux-headers" role="content">
    <title>Contents of Linux-Headers</title>

    <segmentedlist>
      <segtitle>Installed headers</segtitle>
      <segtitle>Installed directories</segtitle>

      <seglistitem>
        <seg>/usr/include/{asm,asm-generic,drm,linux,mtd,rdma,scsi,sound,video,xen}/*.h</seg>
        <seg>/usr/include/asm, /usr/include/asm-generic, /usr/include/drm,
        /usr/include/linux, /usr/include/mtd, /usr/include/rdma,
        /usr/include/scsi, /usr/include/sound, /usr/include/uapi,
        /usr/include/video, /usr/include/xen</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,asm-generic,drm,linux,mtd,rdma,sound,video}/*.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>