Documentation/DocBook/media/dvb/fe-get-property.xml

<refentry id="FE_GET_PROPERTY">
  <refmeta>
    <refentrytitle>ioctl FE_SET_PROPERTY, FE_GET_PROPERTY</refentrytitle>
    &manvol;
  </refmeta>

  <refnamediv>
      <refname>FE_SET_PROPERTY</refname>
      <refname>FE_GET_PROPERTY</refname>
    <refpurpose>FE_SET_PROPERTY sets one or more frontend properties.
	FE_GET_PROPERTY returns one or more frontend properties.</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <funcsynopsis>
      <funcprototype>
	<funcdef>int <function>ioctl</function></funcdef>
	<paramdef>int <parameter>fd</parameter></paramdef>
	<paramdef>int <parameter>request</parameter></paramdef>
	<paramdef>struct dtv_properties *<parameter>argp</parameter></paramdef>
      </funcprototype>
    </funcsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Arguments</title>
        <variablelist>
      <varlistentry>
	<term><parameter>fd</parameter></term>
	<listitem>
	  <para>&fe_fd;</para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term><parameter>request</parameter></term>
	<listitem>
	  <para>FE_SET_PROPERTY, FE_GET_PROPERTY</para>
	</listitem>
      </varlistentry>
      <varlistentry>
	<term><parameter>argp</parameter></term>
	<listitem>
	    <para>pointer to &dtv-properties;</para>
	</listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>Description</title>

    <para>All DVB frontend devices support the
<constant>FE_SET_PROPERTY</constant> and <constant>FE_GET_PROPERTY</constant>
ioctls. The supported properties and statistics depends on the delivery system
and on the device:</para>
<itemizedlist>
<listitem>
    <para><constant>FE_SET_PROPERTY:</constant></para>
<itemizedlist>
<listitem><para>This ioctl is used to set one or more
	frontend properties.</para></listitem>
<listitem><para>This is the basic command to request the frontend to tune into some
    frequency and to start decoding the digital TV signal.</para></listitem>
<listitem><para>This call requires read/write access to the device.</para></listitem>
<listitem><para>At return, the values are updated to reflect the
    actual parameters used.</para></listitem>
</itemizedlist>
</listitem>
<listitem>
    <para><constant>FE_GET_PROPERTY:</constant></para>
<itemizedlist>
<listitem><para>This ioctl is used to get properties and
statistics from the frontend.</para></listitem>
<listitem><para>No properties are changed, and statistics aren't reset.</para></listitem>
<listitem><para>This call only requires read-only access to the device.</para></listitem>
</itemizedlist>
</listitem>
</itemizedlist>
&return-value-dvb;
</refsect1>
</refentry>