Automatically choosing a VT for DRM compositor?

[Armin Krezović]

GDM seems to use VT_OPENQRY .

https://git.gnome.org/browse/gdm/tree/daemon/gdm-session-worker.c#n2209

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On Tue, Oct 24, 2017 at 8:33 AM, Pekka Paalanen <ppaalanen at gmail.com> wrote:

> On Mon, 23 Oct 2017 14:37:37 -0500
> Matt Hoosier <matt.hoosier at gmail.com> wrote:
>
> > It would be nice for non-session uses of Weston (embedded systems) if
> > the controlling TTY didn't need to be manually supplied.
> >
> > Has anybody suggested using something like VT_OPENQRY in the
> > weston-launcher code to pick a TTY if one wasn't manually given? (Or
> > if that's too auto-magic for taste here, then only do that if a
> > specific command-line option is supplied.)
>
> Hi,
>
> I do not recall such proposals. I'd like to hear more about your use
> case.
>
> Do you mean in 'weston-launch' specifically, or in all the launcher
> implementations?
>
> If for 'weston-launch' specifically, then I'd like to ask why you want
> that instead of a logind service?
>
> I've been hoping there would be no need for new development on
> weston-launch. It is sensitive code, being setuid root. It seems it
> cannot be nicely generalized to support all libweston-based compositors.
>
> What is the launching context in you use case? E.g.
> - manual login, type 'weston' in VT
> - type 'weston -Bdrm-backend.so' in a terminal window
> - launching weston from a systemd system unit
> - launching weston from a systemd user unit
> - something else?
>
> What is the "non-session" use exactly? Why do you not care which VT
> weston will occupy in that case?
>
> I haven't checked recently, but I have a feeling that Weston is not
> expecting to be spawned on a currently inactive VT, so that might need
> fixing as well.
>
> >
> > The closest I can find to a question about this topic prior on the
> > mailing list is
> > https://lists.freedesktop.org/archives/wayland-devel/2013-
> October/011472.html.
> > That change was never adopted, but it doesn't look like the use of
> > VT_OPENQRY has anything to do with Kristian's objections at the time.
>
> Picking the first free VT sounds fine to me, but do display servers
> actually do that on their own or does e.g. the graphical login manager
> do it for them? Or rather, when and who usually picks the VT?
>
>
> Thanks,
> pq
>
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