Hi All,

I'm sorry to ask this here because I guess it's not the right place, but I failed to find what I'm looking for.

I developing a python application and I would need some support on KDE, especially on how KDE is using D-Bus. I'm looking to catch end session events among other things.

Is there a dedicated place where I can find help/ ask questions on a subject like this one?

Thank you for your help.

Hi!

You can start reading at Techbase: D-Bus. For logout-stuff you should have a look at freedesktop.org, as systemd or elogind is the current standard on most systems, so you can logout via

Code: Select all

qdbus org.freedesktop.login1 /org/freedesktop/login1 org.freedesktop.login1.Manager.TerminateSession $sessionID
# or
loginctl terminate-session $sessionID


On Plasma the ksmserver should be used.

Code: Select all

qdbus org.kde.ksmserver /KSMServer logout $x $y $z

where x=ask (0/1), y=method (0=none, 1=reboot, 2=halt, 3=logout), z=mode (0=wait, 1=try, 2=force, 3=user popup).

Thank you for your help. I should have mentioned that I'm on CentOS 7.9 and Plasma.

More precisely, I'm not trying to manage the session, I'm trying to catch end session signals, and also Shutdown, Suspend and Resume ones.

Here is what I do for Gnome desktop manager, which is working well, I'm trying now to do the equivalent on Plasma:

Code: Select all

# Shutdown, Suspend and Resume
#
# create inhibit delay lock
QtDBus.QDBusInterface("",  "/org/freedesktop/login1",   "org.freedesktop.DBus.Properties", QtDBus.QDBusConnection.systemBus()).call(
        "sleep", "Bernard", "Update db...", "delay")

# register to signals
QtDBus.QDBusConnection.systemBus().connect("",  "/org/freedesktop/login1",  "org.freedesktop.login1.Manager",  "PrepareForShutdown",  self.OnPrepareForShutdownLin)
QtDBus.QDBusConnection.systemBus().connect("",  "/org/freedesktop/login1",  "org.freedesktop.login1.Manager",  "PrepareForSleep",  self.OnPrepareForSleepLin)

# Session end
#
# register to session bus signals for session end
sessionBus = QtDBus.QDBusConnection.sessionBus()

# get the session manager interface
sessionManager = QtDBus.QDBusInterface("org.gnome.SessionManager",  "/org/gnome/SessionManager",  "org.gnome.SessionManager", sessionBus)
# create a client
clientId = sessionManager.call("RegisterClient","","")
if clientId.type() == 3:
    raise Exception("Couldn't create client to org.gnome.SessionManager. KDE session present instead ?")

# signal connection to slots
path = clientId.arguments()[0]
sessionBus.connect(clientId.service(), path, "org.gnome.SessionManager.ClientPrivate", "EndSession", self.OnEndSessionLin)
sessionBus.connect(clientId.service(), path, "org.gnome.SessionManager.ClientPrivate", "Stop", self.OnStopLin)


I failed to find resources on the Plasma DBus configuration, I don't know how to catch the signals. I tried to use d-feet and dbus-monitor to analyse the org.kde.ksmserver service, but this is an hassle, as each time I close the session or trigger a shutdown I need to wait the OS to restart.

If you could you give me a some hits, or help, that would be much appreciated.

So you do not want to trigger a logout, instead you want to catch it?

This should work using org.freedesktop-stuff, I think org.freedesktop.DBus /org/freedesktop/DBus NameOwnerChanged. But as you need more general hints: use the monitor tool:

Code: Select all

dbus-monitor --user

will show everything running in user context, but you can also watch for --system, for expressions, addresses, … So that should be the tool you were missing, I think.