Using D-Bus To Start Apps

John (J5) Palmieri johnp at
Mon Feb 25 11:17:28 PST 2008

On Tue, 2008-02-26 at 00:14 +0530, Trilok Soni wrote:
> Hi John,
> On Mon, Feb 25, 2008 at 11:45 PM, John (J5) Palmieri <johnp at> wrote:
> >
> >  On Mon, 2008-02-25 at 04:23 -0800, Thanh Tran wrote:
> >  > I would like to use the D-Bus and HAL service to start
> >  > specific apps.  I plan to write a service wich reads
> >  > the D-Bus and looks for specific messages from the HAL
> >  > service.  For example, HAL reports a USB CD ROM drive
> >  > has been recently attached by the user.  My service
> >  > would read the D-Bus and start another application
> >  > based on the device detected.  I think I can create my
> >  > service using the D-Bus C API.  However, is there an
> >  > easier way?  Is writing a separate service over-kill? Thanks.
> >
> >  It depends what you want to do.  Hal already has the ability to run
> >  scripts as root based off of matches.  If you are running something in
> >  the user's session then look at gnome-volume-manager which exec's
> >  programs based on hotplug events from HAL.  You can also use D-Bus
> >  activation which only works in the session currently but the Beta
> >  releases of the new D-Bus support system activation.
> >
> Could you please point to the exact beta release version or git
> version which support this system activation? We had to switch our
> dbus service to system bus from session, as one of the properitery
> media application which was implementing dbus service had to run under
> root (as it was internally accessing /dev/mem interface for ARM-DSP
> communication), and the web-server wanted to run as un-privileged
> user, so as these two application can't run under the single user
> login, session bus was not suitable, but even under system bus, we
> want to activate this media application if it is not running and
> webserver (here dbus-client) initiate the request for
> capture/playback.

Under the heading "Reference Implementation, Development Version
(dbus-daemon and libdbus)".  Right now we have D-Bus-1.1.4 but I will be
releasing the 1.1.20 supported stable version on Wednesday (it is
basically 1.2 without the MIT/X11 license changes which we still have a
couple of people who have yet to sign off on). 
John (J5) Palmieri <johnp at>

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