diff options
| -rw-r--r-- | Documentation/DocBook/media/v4l/func-ioctl.xml | 72 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/gen-errors.xml | 10 | ||||
| -rw-r--r-- | Documentation/DocBook/media/v4l/media-func-ioctl.xml | 1 |
3 files changed, 13 insertions, 70 deletions
diff --git a/Documentation/DocBook/media/v4l/func-ioctl.xml b/Documentation/DocBook/media/v4l/func-ioctl.xml index b60fd37..2de64be 100644 --- a/Documentation/DocBook/media/v4l/func-ioctl.xml +++ b/Documentation/DocBook/media/v4l/func-ioctl.xml @@ -64,75 +64,9 @@ their respective function and parameters are specified in <xref </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> + &return-value; + <para>When an ioctl that takes an output or read/write parameter fails, + the parameter remains unmodified.</para> </refsect1> </refentry> diff --git a/Documentation/DocBook/media/v4l/gen-errors.xml b/Documentation/DocBook/media/v4l/gen-errors.xml index 9bf9ca7..4268c65 100644 --- a/Documentation/DocBook/media/v4l/gen-errors.xml +++ b/Documentation/DocBook/media/v4l/gen-errors.xml @@ -31,7 +31,8 @@ <row> <entry>EINVAL or ENOTTY</entry> <entry>The ioctl is not supported by the driver, actually meaning that - the required functionality is not available.</entry> + the required functionality is not available, or the file + descriptor is not for a media device.</entry> </row> <row> <entry>ENOMEM</entry> @@ -46,3 +47,10 @@ </tbody> </tgroup> </table> + +<para>Note 1: ioctls may return other error codes. Since errors may have side +effects such as a driver reset, applications should abort on unexpected errors. +</para> + +<para>Note 2: Request-specific error codes are listed in the individual +requests descriptions.</para> diff --git a/Documentation/DocBook/media/v4l/media-func-ioctl.xml b/Documentation/DocBook/media/v4l/media-func-ioctl.xml index e0ee285..39478d0 100644 --- a/Documentation/DocBook/media/v4l/media-func-ioctl.xml +++ b/Documentation/DocBook/media/v4l/media-func-ioctl.xml @@ -64,6 +64,7 @@ <refsect1> &return-value; + <para>Request-specific error codes are listed in the individual requests descriptions.</para> <para>When an ioctl that takes an output or read/write parameter fails, |
