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Re: [Xen-devel] [PATCH 1/3] xen/privcmd: return -ENOSYS for unimplemented IOCTLs

On 02/09/2017 09:40 AM, Jan Beulich wrote:
On 09.02.17 at 15:17, <paul.durrant@xxxxxxxxxx> wrote:
The code goes so far as to set the default return code to -ENOSYS but
then overrides this to -EINVAL in the switch() statement's default

If you already change this, isn't -ENOTTY the traditional way of
indicating unsupported ioctls?

In fact, a while ago David submitted a patch to do just that:


but it never went anywhere.

My question is whether anyone might be relying on current error return behavior.


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