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-<refentry id="func-ioctl">
- <refmeta>
- <refentrytitle>V4L2 ioctl()</refentrytitle>
- &manvol;
- </refmeta>
-
- <refnamediv>
- <refname>v4l2-ioctl</refname>
- <refpurpose>Program a V4L2 device</refpurpose>
- </refnamediv>
-
- <refsynopsisdiv>
- <funcsynopsis>
- <funcsynopsisinfo>#include &lt;sys/ioctl.h&gt;</funcsynopsisinfo>
- <funcprototype>
- <funcdef>int <function>ioctl</function></funcdef>
- <paramdef>int <parameter>fd</parameter></paramdef>
- <paramdef>int <parameter>request</parameter></paramdef>
- <paramdef>void *<parameter>argp</parameter></paramdef>
- </funcprototype>
- </funcsynopsis>
- </refsynopsisdiv>
-
- <refsect1>
- <title>Arguments</title>
-
- <variablelist>
- <varlistentry>
- <term><parameter>fd</parameter></term>
- <listitem>
- <para>&fd;</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><parameter>request</parameter></term>
- <listitem>
- <para>V4L2 ioctl request code as defined in the <filename>videodev2.h</filename> header file, for example
-VIDIOC_QUERYCAP.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><parameter>argp</parameter></term>
- <listitem>
- <para>Pointer to a function parameter, usually a structure.</para>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-
- <refsect1>
- <title>Description</title>
-
- <para>The <function>ioctl()</function> function is used to program
-V4L2 devices. The argument <parameter>fd</parameter> must be an open
-file descriptor. An ioctl <parameter>request</parameter> has encoded
-in it whether the argument is an input, output or read/write
-parameter, and the size of the argument <parameter>argp</parameter> in
-bytes. Macros and defines specifying V4L2 ioctl requests are located
-in the <filename>videodev2.h</filename> header file.
-Applications should use their own copy, not include the version in the
-kernel sources on the system they compile on. All V4L2 ioctl requests,
-their respective function and parameters are specified in <xref
- linkend="user-func" />.</para>
- </refsect1>
-
- <refsect1>
- <title>Return Value</title>
-
- <para>On success the <function>ioctl()</function> function returns
-<returnvalue>0</returnvalue> and does not reset the
-<varname>errno</varname> variable. On failure
-<returnvalue>-1</returnvalue> is returned, when the ioctl takes an
-output or read/write parameter it remains unmodified, and the
-<varname>errno</varname> variable is set appropriately. See below for
-possible error codes. Generic errors like <errorcode>EBADF</errorcode>
-or <errorcode>EFAULT</errorcode> are not listed in the sections
-discussing individual ioctl requests.</para>
- <para>Note ioctls may return undefined error codes. Since errors
-may have side effects such as a driver reset applications should
-abort on unexpected errors.</para>
-
- <variablelist>
- <varlistentry>
- <term><errorcode>EBADF</errorcode></term>
- <listitem>
- <para><parameter>fd</parameter> is not a valid open file
-descriptor.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><errorcode>EBUSY</errorcode></term>
- <listitem>
- <para>The property cannot be changed right now. Typically
-this error code is returned when I/O is in progress or the driver
-supports multiple opens and another process locked the property.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><errorcode>EFAULT</errorcode></term>
- <listitem>
- <para><parameter>argp</parameter> references an inaccessible
-memory area.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><errorcode>ENOTTY</errorcode></term>
- <listitem>
- <para><parameter>fd</parameter> is not associated with a
-character special device.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><errorcode>EINVAL</errorcode></term>
- <listitem>
- <para>The <parameter>request</parameter> or the data pointed
-to by <parameter>argp</parameter> is not valid. This is a very common
-error code, see the individual ioctl requests listed in <xref
- linkend="user-func" /> for actual causes.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><errorcode>ENOMEM</errorcode></term>
- <listitem>
- <para>Not enough physical or virtual memory was available to
-complete the request.</para>
- </listitem>
- </varlistentry>
- <varlistentry>
- <term><errorcode>ERANGE</errorcode></term>
- <listitem>
- <para>The application attempted to set a control with the
-&VIDIOC-S-CTRL; ioctl to a value which is out of bounds.</para>
- </listitem>
- </varlistentry>
- </variablelist>
- </refsect1>
-</refentry>
-
-<!--
-Local Variables:
-mode: sgml
-sgml-parent-document: "v4l2.sgml"
-indent-tabs-mode: nil
-End:
--->