Why org.freedesktop.DBus.Local.Disconnected is called?

[Sheng Mao]

Thank you for explaining this, Thiago!

Then it means the unregistration code kwin_x11 will not be executed. Although I
still don’t know who/why terminates the session but it is something I can use.

* in kwin_x11, I need to add a watcher for session disconnected, and close
kwin_x11 event loop on that 
* in startkde, I need to add a timer to query registration status. My test app shows
that the service becomes unregistered after a few seconds. QDBusServiceWatcher 
cannot send a unregistration event/signal if org.kde.KWin is terminated passively.

Thank you! I will do more tests on that. 

> On Nov 8, 2020, at 09:03, Thiago Macieira <thiago at kde.org> wrote:
> 
> On Saturday, 7 November 2020 19:26:26 PST Sheng Mao wrote:
>> Sorry I missed some important information here. Please forgive me that I am
>> not very familiar with field.
>>> However, I use busctl —user monitor org.kde.KWin, it seems
>>> org.freedesktop.DBus.Local.Disconnected signal is issued, so the service
>>> is not unregistered.
>> 
>> The reason is I modified startkde to watch for unregistration of service
>> org.kde.KWin, and after the unregistration, startkde should exit. However,
>> I use busctl to monitor org.kde.KWin (busctl keeps running and waits for
>> log messages), org.freedesktop.DBus.Local.Disconnected signal shows up in
>> the log as the last message and busctl stops working. Then I use busctl to
>> check if org.kde.KWin still exits and the service actually disappears. But
>> when I use QDBusConnectionInterface::isServiceRegistered to check if
>> org.kde.KWin is still registered and the result is the service still is
>> registered.
> 
> This signal means the bus daemon disconnected your client and this happens 
> because the bus daemon isi exiting, closing the connection to all clients.
> 
> I think this is sufficient information for you You don't need further 
> deregistration information: the session is over.
> 
> -- 
> Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
>   Software Architect - Intel DPG Cloud Engineering
> 
> 
> 
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