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Pheeble

Member

Registered: 2015-06-22

Posts: 34

How to detect session logout in Python?

Linux Mint 22.1 XFCE 4.18

I have a Python script that I launch at login to perform some monitoring and logging tasks during the session.

I want it to be able to shut down gracefully when I log out.

I assumed it would be sent a SIGTERM signal at logout, so I wrote the shut down function to be run when the SIGTERM signal is received.

It works perfectly if I run the python script in a terminal and send the SIGTERM signal via a kill command, but a SIGTERM signal is never received when I log out. Presumably xfce4-session-logout does not send signals. 

Is there some way to detect when xfce4-session-logout is about to end the session?

ToZ

Administrator

From: Canada

Registered: 2011-06-02

Posts: 12,680

Re: How to detect session logout in Python?

If you go to Settings Manager > Session and Startup > Application Autostart, you can set a script to run on a logout, restart, or shutdown trigger. You can try that to see if it works.

Otherwise, you can look at creating an xfce4-session wrapper script.

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Pheeble

Member

Registered: 2015-06-22

Posts: 34

Re: How to detect session logout in Python?

If you go to Settings Manager > Session and Startup > Application Autostart, you can set a script to run on a logout, restart, or shutdown trigger. You can try that to see if it works.

Otherwise, you can look at creating an xfce4-session wrapper script.

Thanks for the speedy reply 

It looks like the easiest solution is to modify my python script to check for script arguments at launch, and simply re-launch the script with, for example, a '--shutdown' argument via the triggers you mentioned.

Do you know if there is any reliable way to detect a logout/shutdown process programmatically in XFCE, such as via dbus?

eriefisher

Wanderer

From: ON, Canada

Registered: 2008-10-25

Posts: 1,019

Website

Re: How to detect session logout in Python?

If you put your script in the autostart list, logging out or shutting down will kill the script.

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ToZ

Administrator

From: Canada

Registered: 2011-06-02

Posts: 12,680

Re: How to detect session logout in Python?

Do you know if there is any reliable way to detect a logout/shutdown process programmatically in XFCE, such as via dbus?

You could try using systemd to run a script on shutdown. See https://forum.manjaro.org/t/running-a-s … /143440/2\ for an example of how this can be done.

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