lfs-book/chapter06/dbus.xml

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  "http://www.oasis-open.org/docbook/xml/4.5/docbookx.dtd" [
  <!ENTITY % general-entities SYSTEM "../general.ent">
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<sect1 id="ch-system-dbus" role="wrap">
  <?dbhtml filename="dbus.html"?>

  <sect1info condition="script">
    <productname>dbus</productname>
    <productnumber>&dbus-version;</productnumber>
    <address>&dbus-url;</address>
  </sect1info>

  <title>D-Bus-&dbus-version;</title>

  <indexterm zone="ch-system-dbus">
    <primary sortas="a-dbus">D-Bus</primary>
  </indexterm>

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

    <para>D-Bus is a message bus system, a simple way for applications to talk
    to one another. D-Bus supplies both a system daemon (for events such as
    “new hardware device added” or “printer queue changed”) and a
    per-user-login-session daemon (for general IPC needs among user
    applications). Also, the message bus is built on top of a general one-to-one
    message passing framework, which can be used by any two applications to
    communicate directly (without going through the message bus daemon).</para>

    <segmentedlist>
      <segtitle>&buildtime;</segtitle>
      <segtitle>&diskspace;</segtitle>

      <seglistitem>
        <seg>&dbus-ch6-sbu;</seg>
        <seg>&dbus-ch6-du;</seg>
      </seglistitem>
    </segmentedlist>

  </sect2>

  <sect2 role="installation">
    <title>Installation of D-Bus</title>

    <para>The D-Bus system daemon (the message bus) needs to run as a non-priveleged user, so create a suitable group and user:</para>

<screen><userinput remap="pre">groupadd -g 18 messagebus
useradd -c "D-Bus Message Daemon User" -d /var/run/dbus \
        -u 18 -g messagebus -s /bin/false messagebus</userinput></screen>

    <para>Prepare D-Bus for compilation:</para>

<screen><userinput remap="configure">./configure --prefix=/usr \
            --sysconfdir=/etc \
            --localstatedir=/var \
            --docdir=/usr/share/doc/dbus-&dbus-version; \
            --libexecdir=/usr/lib/dbus-1.0 \
            --with-console-auth-dir=/run/console/ \
            --without-systemdsystemunitdir \
            --disable-systemd</userinput></screen>

    <variablelist>
      <title>The meaning of the configure options:</title>

      <varlistentry>
        <term><parameter>--with-console-auth-dir=/run/console</parameter></term>
        <listitem>
          <para>This specifies the location of the ConsoleKit auth
          directory.</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><parameter>--without-systemdsystemunitdir</parameter></term>
        <listitem>
          <para>This prevents installation of Systemd unit files as Systemd
          has not been installed yet (due to a circular dependency; Systemd
          requires D-Bus, but D-Bus can also use Systemd functionality).</para>
        </listitem>
      </varlistentry>

      <varlistentry>
        <term><parameter>--disable-systemd</parameter></term>
        <listitem>
          <para>This disables Systemd support in D-Bus, again due to the
          circular dependency between D-Bus and Systemd.</para>
        </listitem>
      </varlistentry>

    </variablelist>

    <para>Compile the package:</para>

<screen><userinput remap="make">make</userinput></screen>

    <para>This package does come with a testsuite, but it requires several
    packages that are not included in LFS.</para>

    <para>Install the package:</para>

<screen><userinput remap="install">make install</userinput></screen>

  </sect2>

  <sect2 id="contents-dbus" role="content">
    <title>Contents of D-Bus</title>

    <segmentedlist>
      <segtitle>Installed programs</segtitle>
      <segtitle>Installed libraries</segtitle>

      <seglistitem>
        <seg>dbus-cleanup-sockets, dbus-daemon, dbus-monitor, dbus-send,
        dbus-uuidgen</seg>
        <seg>libdbus-1.{so,a}</seg>
      </seglistitem>
    </segmentedlist>

    <variablelist>
      <bridgehead renderas="sect3">Short Descriptions</bridgehead>
      <?dbfo list-presentation="list"?>
      <?dbhtml list-presentation="table"?>

      <varlistentry id="dbus-cleanup-sockets">
        <term><command>dbus-cleanup-sockets</command></term>
        <listitem>
          <para>Used to clean up leftover sockets in a directory.</para>
          <indexterm zone="ch-system-dbus dbus-cleanup-sockets">
            <primary sortas="b-dbus-cleanup-sockets">dbus-cleanup-sockets</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="dbus-daemon">
        <term><command>dbus-daemon</command></term>
        <listitem>
          <para>The D-Bus message bus daemon.</para>
          <indexterm zone="ch-system-dbus dbus-daemon">
            <primary sortas="b-dbus-daemon">dbus-daemon</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="dbus-monitor">
        <term><command>dbus-monitor</command></term>
        <listitem>
          <para>Monitors messages passing through a D-Bus message bus.</para>
          <indexterm zone="ch-system-dbus dbus-monitor">
            <primary sortas="b-dbus-monitor">dbus-monitor</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="dbus-send">
        <term><command>dbus-send</command></term>
        <listitem>
          <para>Sends a message to a D-Bus message bus.</para>
          <indexterm zone="ch-system-dbus dbus-send">
            <primary sortas="b-dbus-send">dbus-send</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="dbus-uuidgen">
        <term><command>dbus-uuidgen</command></term>
        <listitem>
          <para>Generates a universally unique ID.</para>
          <indexterm zone="ch-system-dbus dbus-uuidgen">
            <primary sortas="b-dbus-uuidgen">dbus-uuidgen</primary>
          </indexterm>
        </listitem>
      </varlistentry>

      <varlistentry id="libdbus">
        <term><filename class="libraryfile">libdbus.{so,a}</filename></term>
        <listitem>
          <para>Contains API functions used to communicate with the D-Bus
          message bus.</para>
          <indexterm zone="ch-system-dbus libdbus">
            <primary sortas="c-libdbus">libdbus</primary>
          </indexterm>
        </listitem>
      </varlistentry>

    </variablelist>

  </sect2>

</sect1>