Re: Latest V4L2 breaks binary compatibility ??

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On Wed, Sep 24, 2003 at 10:50:21AM -0500, Billy Biggs wrote:
>   Isaac Richards pointed out to me that it seems like the latest V4L2
> patches break binary compatibility.  In
> http://bytesex.org/patches/2.6.0-test5-2/20_v4l2-2.6.0-test5.diff
> 
>   -#define VIDIOC_S_PARM		_IOW  ('V', 22, struct v4l2_streamparm)
>   +#define VIDIOC_S_PARM		_IOWR ('V', 22, struct v4l2_streamparm)
> 
>   -#define VIDIOC_S_CTRL		_IOW  ('V', 28, struct v4l2_control)
>   +#define VIDIOC_S_CTRL		_IOWR ('V', 28, struct v4l2_control)
> 
>   What happened?  I fear this will break many apps.

It doesn't.  Check the complete diff.  There also is ...

+#define VIDIOC_S_PARM_OLD              _IOW  ('V', 22, struct v4l2_streamparm)
+#define VIDIOC_S_CTRL_OLD              _IOW  ('V', 28, struct v4l2_control)

... and the new video_fix_command() function which maps
VIDIOC_FOOBAR_OLD to VIDIOC_FOOBAR.

The patched kernel accepts both old and new ioctls.

  Gerd

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You have a new virus in /var/mail/kraxel


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