CooCenter-System-kernel/Documentation/DocBook/media/v4l/func-close.xml

<refentry id="func-close">
  <refmeta>
    <refentrytitle>V4L2 close()</refentrytitle>
    &manvol;
  </refmeta>

  <refnamediv>
    <refname>v4l2-close</refname>
    <refpurpose>Close a V4L2 device</refpurpose>
  </refnamediv>

  <refsynopsisdiv>
    <funcsynopsis>
      <funcsynopsisinfo>#include &lt;unistd.h&gt;</funcsynopsisinfo>
      <funcprototype>
	<funcdef>int <function>close</function></funcdef>
	<paramdef>int <parameter>fd</parameter></paramdef>
      </funcprototype>
    </funcsynopsis>
  </refsynopsisdiv>

  <refsect1>
    <title>Arguments</title>

    <variablelist>
      <varlistentry>
	<term><parameter>fd</parameter></term>
	<listitem>
	  <para>&fd;</para>
	</listitem>
      </varlistentry>
    </variablelist>
  </refsect1>

  <refsect1>
    <title>Description</title>

    <para>Closes the device. Any I/O in progress is terminated and
resources associated with the file descriptor are freed. However data
format parameters, current input or output, control values or other
properties remain unchanged.</para>
  </refsect1>

  <refsect1>
    <title>Return Value</title>

    <para>The function returns <returnvalue>0</returnvalue> on
success, <returnvalue>-1</returnvalue> on failure and the
<varname>errno</varname> is set appropriately. Possible error
codes:</para>

    <variablelist>
      <varlistentry>
	<term><errorcode>EBADF</errorcode></term>
	<listitem>
	  <para><parameter>fd</parameter> is not a valid open file
descriptor.</para>
	</listitem>
      </varlistentry>
    </variablelist>
  </refsect1>
</refentry>