On https://lists.gnome.org/archives/commits-list/2019-May/msg04333.html
one may read:
main: Add systemd gnome-session monitoring code for leader
We are in the situation that gnome-session-binary is the session leader
process for the user. This process is managed via logind and is inside
the session scope of the user. This process has an important role for
the session lifetime management, but we cannot track or manage its state
from the systemd user instance.
This adds a simple protocol to allow us managing the state. The
counterpart is in gnome-session-ctl.c.
It works by creating a named fifo called gnome-session-leader-fifo in
the users runtime directory. The session leader opens it for writing,
the monitoring process opens it for reading.
By closing the FD the monitor process can signal to the leader that the
session has been shut down normally. By writing to the FD the leader can
signal the monitoring process to initiate a clean shutdown of the
session. If either process crashes or is killed, the FD is closed and
the other side will also quit.
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Packages, which is subscribed to gnome-session in Ubuntu.
https://bugs.launchpad.net/bugs/2063383
Title:
[SRU] Ubuntu Unity takes 90 seconds to log out
Status in gnome-session package in Ubuntu:
Triaged
Status in gnome-session source package in Noble:
Confirmed
Bug description:
[ Impact ]
Ubuntu Unity reliably takes 90 seconds to log out. This is due to the
user-level gnome-session.service systemd unit not properly terminating
gnome-session on logout. An attempt is made to send SIGTERM to the
process, which gnome-session does not care about.
Instead, gnome-session-quit should be invoked when the systemd unit
shuts down, which acts effectively and immediately.
[ Test Plan ]
Actual behavior:
1. Log in to a Unity session on Ubuntu Unity 24.04.
2. Log out of Ubuntu Unity.
3. Observe that only the wallpaper is shown for 90 seconds prior to the
login manager showing again.
Expected behavior:
1. Log in to a Unity session on Ubuntu Unity 24.04.
2. Log out of Ubuntu Unity.
3. Observe that logging out takes a few seconds at most, and you are able to
log back in as the same user, or a different one.
[ Where problems could occur ]
If the gnome-session or gnome-session-quit binaries change the
arguments they accept by default, log in and log out functionality on
Unity sessions are likely to break.
Additionally, if lightdm or systemd changes in a non-reverse-
compatible way, this increases the chance of a user-facing regression.
To manage notifications about this bug go to:
https://bugs.launchpad.net/ubuntu/+source/gnome-session/+bug/2063383/+subscriptions
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