Messages in this thread | | | Date | Thu, 15 Oct 2009 16:01:09 +0100 | From | Alan Cox <> | Subject | Re: [RFC] Remove or convert empty ioctls ? |
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> "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.
Alan
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