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author | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
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committer | Srikant Patnaik | 2015-01-11 12:28:04 +0530 |
commit | 871480933a1c28f8a9fed4c4d34d06c439a7a422 (patch) | |
tree | 8718f573808810c2a1e8cb8fb6ac469093ca2784 /Documentation/DocBook/media/v4l/func-ioctl.xml | |
parent | 9d40ac5867b9aefe0722bc1f110b965ff294d30d (diff) | |
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Moved, renamed, and deleted files
The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.
Diffstat (limited to 'Documentation/DocBook/media/v4l/func-ioctl.xml')
-rw-r--r-- | Documentation/DocBook/media/v4l/func-ioctl.xml | 71 |
1 files changed, 71 insertions, 0 deletions
diff --git a/Documentation/DocBook/media/v4l/func-ioctl.xml b/Documentation/DocBook/media/v4l/func-ioctl.xml new file mode 100644 index 00000000..4394184a --- /dev/null +++ b/Documentation/DocBook/media/v4l/func-ioctl.xml @@ -0,0 +1,71 @@ +<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 <sys/ioctl.h></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> + &return-value; + <para>When an ioctl that takes an output or read/write parameter fails, + the parameter remains unmodified.</para> + </refsect1> +</refentry> |