Re: [RFC] Remove or convert empty ioctls ?

[Jeff Garzik]

On 10/15/2009 11:01 AM, Alan Cox wrote:
> > "no particular value" is highly subjective, and I think unprovable,
> > without an exhaustive survey of userland programs interacting with
> > kernel drivers.  Userland programs often interact with a -class- of
> > drivers, expecting predictable behavior from a DoThisThing ioctl, with
> > EINVAL or "other weird error code" returned intentionally.
> >
> > Changing the return codes seems quite unwise.
>
> We've changed lots of them to -ENOTTY over the past few years, nobody has
> even noticed (you included ;))
>
> SuS says an unknown ioctl code returns -ENOTTY.

These are not unknown ioctls; they are ioctls that the driver author 
close to implement rather than the default (ENOTTY).

	Jeff




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