* recreate VTs when disallocated
* spawn user systemd
* direct client API
- * D-Bus method: AttachDevice(seat, device);
+ * D-Bus method: AttachDevices(seat, devices[]);
* D-Bus method: SetLinger(user, bool b);
+ * kill cgroup immediately when fd is EOF.
*
* non-local X11 server
* reboot/shutdown halt management