Re: kcmp(2)

[Robert Swindells <rjs%fdy2.co.uk@localhost>]

Jason Thorpe <thorpej%me.com@localhost> wrote:
>> On Jul 18, 2023, at 2:57 PM, Mouse <mouse%Rodents-Montreal.ORG@localhost> wrote:
>> 
>>>> What does Mesa use kcmp(2) for?
>>> Working out whether two device handles are to the same DRM device.
>> 
>>>> Is there another way to accomplish what Mesa is trying to use it for?
>>> I don't know of one.
>> 
>> Is fstat() plus checking st_rdev (and possibly other fields)
>> insufficient?
>
> That *might* work in this particular case, but it would not work for
> e.g. a cloning device where you get additional descriptors via dup() or
> whatever.

Using fstat(2) does seem to work well enough for MesaLib, Xorg starts
up now for me.