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    SubjectRe: [RFC] Remove or convert empty ioctls ?
    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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