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Re: Multiple X logins



www.wolfspakt.de/spiel.php?id=7358







On Wed, 8 Mar 2006 13:01:16 -0800
"Miles Lane" <miles lane gmail com> wrote:

> On 3/8/06, Chris Tyler <chris tylers info> wrote:
> > On Tue, 2006-03-07 at 23:44 -0500, fedora-test-list-request redhat com
> > wrote:
> > >
> > > Though recently, it seems that certain people
> > > http://blog.fubar.dk/?p=63
> > > are thinking about how to solve the problems associated with multiple
> > > concurrent "console" user policy via dbus.  Its a long blog post and
> > > it will confuse you, as it continues to confuse me, until you are
> > > comfortable in dbus messaging syntax.
> >
> >
> > I'm concerned that we're thinking too small here. There's more to this
> > that multiple users on the console VTs...
> >
> > - multiseat systems (several video cards/keyboards/monitors on one box -
> > we're seeing more of this now that we have X11R7)
> > - VNC and NX remote users
> > - LTSP
> > - housewide multimedia systems
> >
> > Each of these are entangled with the console ownership issues. For
> > example:
> >
> > - in a multiseat system, different parts of the local hardware may be in
> > use by users in the different seats. Any of the users might want to use
> > the disc burner or mount a CD. The user on X0 may be using /dev/snd/*C1*
> > while the user on X1 may be using /dev/snd/*C2* and the user on X2 may
> > be using /dev/snd/*C0*. And I won't even get into flash drives :-O
> >
> > - in a housewide multimedia system, perhaps the console user should only
> > get ownership of /dev/snd/*C0* while /dev/snd/*C[1-9]* remain owned by
> > the whole-home multimedia app, which uses them to pipe sound into other
> > rooms.
> >
> > - LTSP and NX users may want sound to be redirected through some virtual
> > sound device to their remote system. The ownership of that virtual
> > device will follow different rules than the ownership of the console
> > devices.
> >
> > We need a table of which hardware is associated which which user ID and
> > which X display (whether local or remote) and a way of expressing rules
> > of arbitrary complexity for how the table entries are to be updated.
> > This table should be used not only to set ownership and permissions, but
> > also to enable applications to use the right device, e.g., send sound to
> > the correct sound card, display an icon for a new flash drive on the
> > right desktop, open a DVD player app on the right screen when a disc is
> > inserted.
> 
> Chris, I totally agree with you.  I raised similar concerns years ago on the
> XFree86 list and others.  Not sure which lists these ideas should be
> discussed on.  Maybe here:  http://lists.freedesktop.org/mailman/listinfo/xdg
> 
>        Miles
> 
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