[systemd-devel] [RFC] logind: introduce session "positions"

[Colin Guthrie]

'Twas brillig, and David Herrmann at 01/12/13 11:43 did gyre and gimble:
> During session_load() or if two sessions have the same VTnr, we may end up
> with two sessions with the same position (this shouldn't happen, but lets
> be fail-safe in case some other part of the stack fails). 

I presume this would actually be quite easy if we get around to
implementing Lennart's suggested force-new-session=1 pam_systemd option
which will be used by su-l, sudo-i, and possible polkit stuff?

> This case is
> dealt with gracefully by ignoring any session but the first session
> assigned to the position. Thus, session->pos is a hint, seat->positions[i]
> is the definite position-assignment. Always verify both match in case you
> need to modify them!

Even if pam_systemd did get this new feature, it sounds like this
strategy would work fine for dealing with switching anyway.

Col


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Colin Guthrie
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