[Bug 253277] x11/xtrans: Don't unlink existing UNIX sockets => allows multiple X sessions from sddm

https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=253277

--- Comment #8 from Olivier Certner <olivier.freebsd@free.fr> ---
Hi Jan,

I provided a lot of background and explanations (and asked questions) in this
mail almost 2 years ago:
https://lists.x.org/archives/xorg-devel/2021-July/058735.html

Every line of it is still valid.  Unfortunately, I never received any response,
and after some months I kinda lost hope in upstream doing anything on this
matter.

Thanks for pointing me to Jon Turnery's MR, which I was not aware of.  Upstream
doesn't seem to have made any progress since then (almost 1 year and a half
ago).  Glancing at the MR, I have doubts about their approach, in particular
the fact that this should be fixed in the server.  I think it is likely it
should fixed in xtrans instead.  After all, this is where sockets are created
or unlinked, which should not happen without a locking mechanism.  Moreover, as
pointed out in the mail, the current lock file mechanism in the X server is
logically incorrect and could be defeated in arguably rare or provoked
situations.

I may try to give it a new shot soon (next week perhaps), but not making hard
promises.

Thanks and regards.

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