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authorDavid Herrmann <dh.herrmann@gmail.com>2013-09-17 23:40:19 +0200
committerLennart Poettering <lennart@poettering.net>2013-09-17 17:15:30 -0500
commitd7bd01b547bd91353513131561de9cc7d9f7d405 (patch)
treecf914215fd4aae73761cc77149bfa227cc596d5d /Makefile.am
parent118ecf32425a590ea266b5c2b6de7962bb242356 (diff)
logind: implement generic multi-session
This enables the multi-session capability for seats that don't have VTs. For legacy seats with VTs, everything stays the same. However, all other seats now also get the multi-session capability. The only feature that was missing was session-switching. As logind can force a session-switch and signal that via the "Active" property, we only need a way to allow synchronized/delayed session switches. Compositors need to cleanup some devices before acknowledging the session switch. Therefore, we use the session-devices to give compositors a chance to block a session-switch until they cleaned everything up. If you activate a session on a seat without VTs, we send a PauseDevice signal to the active session for every active device. Only once the session acknowledged all these with a PauseDeviceComplete() call, we perform the final session switch. One important note is that delayed session-switching is meant for backwards compatibility. New compositors or other sessions should really try to deal correctly with forced session switches! They only need to handle EACCES/EPERM from syscalls and treat them as "PauseDevice" signal. Following logind patches will add a timeout to session-switches which forces the switch if the active session does not react in a timely fashion. Moreover, explicit ForceActivate() calls might also be supported. Hence, sessions must not crash if their devices get paused.
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