Re: [PATCH 1/1] V4L: stk11xx, add a new webcam driver

[Mauro Carvalho Chehab <mchehab@infradead.org>]

> > This seems to be an interesting approach.
> >
> >   
> Interesting but impossible to do for ioctl calls.
> When the application does a ioctl(fd_of_mnt_video0,VIDIOC_G_FMT,&arg) 
> for example, there is no way for the userspace helper to catch this ioctl.
> The application could only open/read from the userspace helper's file 
> /mnt/video0.
> ioctl would still have to be done on the kernel device driver.
> I thought also about a /proc interface for decompression algorithms (a 
> helper would listen on a /proc file and write on another /proc file) but 
> /proc is not designed for that kind of thing.
> A separate library seems to be the simplest solution.

There are some ways for this to work. For example, you may create a
helper device for the daemon driver to bind, even requiring it to have
root permission.

-- 
Cheers,
Mauro