[xubuntu-users] How to get process to start with GUI login and exit on GUI logout?

[Knute Johnson]

On 2/1/22 02:46, Chris Green wrote:
> On Mon, Jan 31, 2022 at 09:00:45PM -0600, Knute Johnson wrote:
>>
>>
>> On 1/31/22 17:17, Chris Green wrote:
>>
>>> It's currently being started by a .desktop file in
>>> ~/.config/autostart, the standard way created by an entry in 'Session
>>> and Startup'.  It's just a bash shell script.
>>>
>>>
>>>> You are probably going to have to start it with systemd.
>>>>
>>> I don't think that helps does it, systemd doesn't have the ability to
>>> start a program when an X session is started, nor can it stop a
>>> program when X exits.
>>>
>>
>> It's really easy to start a program with systemd once the desktop is up but
>> I cannot for the life of me figure out a way to stop one.
>>
>> GUI programs stop when you exit the desktop. I've got one idea I'm going to
>> try tomorrow and that is wrapping the script in a Java program that opens a
>> window.  If it kills the VM it should kill the script running in it as well.
>>
> As far as I can tell all of the programs that are children of
> xfce4-session and thus exit when the session ends are compiled
> executables and thus probably call session management functions to
> handle session shutdown.  Most of them in fact have a parameter
> "--sm-client-id <id>" which presumably means that the session manager
> probably tells them to shut down.
> 
> Thus it would seem that a program has to hook into some sort of
> session management library function to be able to exit at end of
> session.
> 

As far as I can tell all of the programs that are children of
xfce4-session and thus exit when the session ends are compiled
executables and thus probably call session management functions to
handle session shutdown.  Most of them in fact have a parameter
"--sm-client-id <id>" which presumably means that the session manager
probably tells them to shut down.

Thus it would seem that a program has to hook into some sort of
session management library function to be able to exit at end of
session.


-- 

Knute Johnson