2015-04-08 11:51 GMT+02:00 Russell Coker <russell@coker.com.au>:
On Wed, 8 Apr 2015 09:41:33 AM Michele Bert wrote:
2015-04-08 3:42 GMT+02:00 Trent W. Buck <trentbuck@gmail.com>:
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).
ps axf is your friend:
Interesting. My Ubuntu 12.04 (without any graphical session - I just logged in through ssh) gives: 1064 ? Ssl 0:00 gdm-binary 1104 ? Sl 0:00 \_ /usr/lib/gdm/gdm-simple-slave --display-id /org/gnome/DisplayManager/Display1 1140 tty7 Ss+ 0:08 \_ /usr/bin/Xorg :0 -background none -verbose -auth /var/run/gdm/auth-for-gdm-hKBUNV/database -nolisten tcp vt7 1724 ? Ssl 0:00 \_ /usr/bin/gnome-session --session gdm --autostart=/usr/share/gdm/autostart/LoginWindow/ 1730 ? Sl 0:25 | \_ /usr/lib/gnome-settings-daemon/gnome-settings-daemon 1838 ? Sl 0:03 | \_ metacity 1859 ? Sl 0:35 | \_ /usr/lib/gdm/gdm-simple-greeter 1866 ? S 0:00 \_ /usr/lib/gdm/gdm-session-worker And after logging into the graphical desktop: 1064 ? Ssl 0:00 gdm-binary 1104 ? Sl 0:00 \_ /usr/lib/gdm/gdm-simple-slave --display-id /org/gnome/DisplayManager/Display1 1140 tty7 Ss+ 0:10 \_ /usr/bin/Xorg :0 -background none -verbose -auth /var/run/gdm/auth-for-gdm-hKBUNV/database -nolisten tcp vt7 1866 ? Sl 0:00 \_ /usr/lib/gdm/gdm-session-worker 4530 ? Ssl 0:01 \_ gnome-session --session=ubuntu-2d 4627 ? Ss 0:00 \_ /usr/bin/ssh-agent /usr/bin/dbus-launch --exit-with-session gnome-session --session=ubuntu-2d 4638 ? Sl 0:01 \_ /usr/lib/gnome-settings-daemon/gnome-settings-daemon 4657 ? Sl 0:00 \_ metacity 4668 ? Sl 0:00 \_ unity-2d-panel 4669 ? Sl 0:01 \_ unity-2d-shell 4677 ? Sl 0:00 \_ bluetooth-applet 4681 ? Sl 0:00 \_ /usr/lib/gnome-settings-daemon/gnome-fallback-mount-helper 4692 ? Sl 0:01 \_ nautilus -n 4693 ? Sl 0:00 \_ /usr/lib/policykit-1-gnome/polkit-gnome-authentication-agent-1 4694 ? Sl 0:00 \_ nm-applet 5294 ? Sl 0:00 \_ /usr/lib/gnome-disk-utility/gdu-notification-daemon 5535 ? Sl 0:00 \_ telepathy-indicator 5777 ? Sl 0:00 \_ gnome-screensaver 7632 ? Sl 0:00 \_ update-notifier I'd expect the PID of Xorg to be changed (if it was restarted), but it actually didn't. If I understand well, the DM starts the X server, than it reuses the same for the user logging in... -- Mick