<div>On 3/19/06, Oliver Frommel <<a href="mailto:ofrommel@linuxnewmedia.de">ofrommel@linuxnewmedia.de</a>> wrote: <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> - What is the point in having a separate session bus when a system bus is already running?</blockquote><div> The system bus is there to provide coordination between system-wide services that are independent of individual users and their apps running, while the session bus is there for "desktop communication" primarily, that is, to provide coordination and communication between apps that an individual user would run (as opposed to apps/services that the "system would run"). </div> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Does the session bus require not authentication at all?</blockquote><div> (Someone else might be better in answering this point) I think there is no authentication apart that only the user in question running the particular session bus has the session bus address in his environment and therefore only he can use/access the bus/daemon.  </div> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> - Is it possible to connect both busses? If yes, how?</blockquote><div> You request a connection to either the session or system bus, like this: DbusConnection *connection; DBusError error; dbus_error_init (&error); connection = dbus_bus_get (DBUS_BUS_SYSTEM, &error); OR: connection = dbus_bus_get (DBUS_BUS_SESSION, &error); </div> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> - How is the namespace policy in that connection. For instance could I have the same service names, object paths etc on both busses, e.g. org.freedesktop.Hal?</blockquote><div> Yeah you could although with your practical example it's sort of pointless (HAL as a user/session service is kinda pointless). </div> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;">- Is it possible to create new services without .service files? How about objects and interfaces?</blockquote><div> Yes you can make an app provide a service/interface without a service file, it's just that the activation/discovery mechanism will not work without a service file; this means that when something wants to call some method on that interface, DBus will not know how to launch the application/binary that provides this interface and hence you'll get an error message that there was no service file found for this interface. Once you start that app in question manually though the interface is present just as if had been started trough DBus itself. </div> <blockquote class="gmail_quote" style="border-left: 1px solid rgb(204, 204, 204); margin: 0pt 0pt 0pt 0.8ex; padding-left: 1ex;"> Thanks for your help Oliver -- Linux New Media AG Süskindstraße 4 D-81929 München Tel: +49 (89) 99 34 11 42 Fax: +49 (89) 99 34 11 99 <a href="http://linuxnewmedia.de">http://linuxnewmedia.de</a> _______________________________________________ dbus mailing list <a href="mailto:dbus@lists.freedesktop.org">dbus@lists.freedesktop.org</a> <a href="http://lists.freedesktop.org/mailman/listinfo/dbus">http://lists.freedesktop.org/mailman/listinfo/dbus </a> </blockquote></div>