Michele Bert wrote:
> 2015-04-08 3:42 GMT+02:00 Trent W. Buck <[email protected]>:
>
> > At least xdm starts *before* the X server.
> > It's xdm that *starts* the X server.
> >
>
> I've neve gone into details, but that's a question which sometimes comes up
> in my mind: how does a graphical DM render images on the screen? Does it
> interface with some drivers, or with an X-server?
> In the second case X starts before the DM (and it's then restarted by the
> DM).
I assume the logic is something like
run X in the background (root gets the MIT cookie)
wait until it's "up"
connect to it over X
do a bunch of X requests to draw the greeter
<pam auth magic>
put the MIT cookie where the user can read it
close the greeter window
spawn a user-owned process running /etc/X11/Xsession
IOW it draws the greeter by talking X to the X server.
I'm 100% certain that's how xdm and gdm2 work.
I'm not as confident about others,
but using directfb or something would be silly.
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