> From: Oliver Neukum <[EMAIL PROTECTED]>
> Date: Wed, 18 Dec 2002 01:20:56 +0100
> unknown ioctls return -ENOTTY and nothing else.
> - return -ENOIOCTLCMD;
> + return -ENOTTY;
Does it pop to userland in that code? Alan says it can be used
under controlled conditions.
> Alan Cox <[EMAIL PROTECTED]>
> Date: Sat, 12 May 2001 12:16:09 +0100 (BST)
>
> It should never be seen by apps. If it can be then it is wrong code.
> Basically you use it in things like
>
> int err = dev->ioctlfunc(dev, op, arg);
> if( err != -ENOIOCTLCMD)
> return err;
> /* Driver specific code does not support this ioctl */
> switch(op)
> {
> ...
> default:
> return -ENOTTY;
> }
>
> Its a way of passing back 'you handle it'
-- Pete
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