[LightDM] how to exit display manager

[Gabriele Bulfon]

Hi,
I'm customizing the power menu, adding "Exit Display Manager..." to get back to text console.
I tried issuing a sigsend SIGQUIT to the parent pid of the greeter, but doesn't work.
What is a correct way to tell lightdm to quit?
BTW I could patch lightdm to support Solaris RBAC and allow for shutdown and reboot through HAL
dbus. :)
Thanks!
Gabriele
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