how to "discover" the session bus
thiago at kde.org
Tue Apr 8 14:28:22 PDT 2008
Ross Burton wrote:
>On Tue, 2008-04-08 at 11:08 -0700, Shawn Rutledge wrote:
>> I'm getting started with libdbus (developing a Scheme binding).
>> On OpenMoko the issue has come up, how to "discover" the bus address
>> of the already-running session daemon. /etc/X11/Xsession starts the
>> daemon, so inside that X session it is accessible, but what if you ssh
>> to the phone or otherwise get another shell? I modified Xsession to
>> do this
>Set $DISPLAY and let DBus find the session bus by looking at the
>properties DBus sets on the root window?
That currently works only as long as the D-Bus session was autolaunched as
well. If someone used dbus-launch directly, chances are that the
information is not on the X11 window.
(Technically speaking, it's not the root window. When in autolaunch mode,
dbus-launch creates a selection atom and assigns it to its own window; in
that window, it keeps two properties: the PID and the session address.
The discovery process is to obtain the WId of the selection atom and then
get the well-known properties from that window. If dbus-launch crashes,
the information disappears automatically -- no stale info on the root
Thiago Macieira - thiago (AT) macieira.info - thiago (AT) kde.org
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