On 08/07/2017 07:06 PM, Knut St. Osmundsen wrote:
Hi Hans,

sorry but I'm not convinced this is really useful and improving the code. We 
will fix this properly in a cross platform manner eventually, I hope.

No problem, I've already reverted the changes in the vboxguest version
I'm working on for the mainline kernel.

On 08/08/2017 01:02 AM, Knut St. Osmundsen wrote:
> Just to clarify the design a little here.
> The I/O controls aren't part of any user space API.  They are supposed
> (*) to be 104% internal and only used between the driver (VBoxGuest) and
> the ring-3 library (VBoxGuestLib).  User land clients will call
> functions in VBoxGuestLib and not care at all how that functions
> internally, only that the jobs get done and that the right status code
> gets returned for each call.
> Regarding the idea that Michael proposed of having a last status
> associated with the session: Doesn't work with multithreaded clients
> like VBoxService.  Also, it's inefficient to have to go back to ring-0
> again just to retrieve a status code, especially if the guest is running
> in raw-mode.




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