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D-Bus (Desktop Bus) is a simple inter-process communication (IPC) system for software applications to communicate with one another. D-Bus was heavily influenced by KDE2–3's DCOP system and has replaced it in the KDE 4 release; it is supported on Linux, Microsoft Windows and Apple OS X operating systems and is used by Qt 4 and GNOME.

Source: D-Bus - Wikipedia.

D-Bus is automatically started by HAL, you don't need to (and you shouldn't) add it to your DAEMONS array in Template:Filename.


Could not get UID and GID

If you get the following error while starting DBUS:

Failed to start message bus: Could not get UID and GID for username "dbus"

then add the user like so:

# groupadd -g 81 dbus
# useradd -c 'System message bus' -u 81 -g dbus -d '/' -s /bin/false dbus

D-bus Launch

If you are not using a desktop environment, more than likely you will need to add the following to your .xinitrc:

# D-bus
if which dbus-launch >/dev/null && test -z "$DBUS_SESSION_BUS_ADDRESS"; then
       eval `dbus-launch --sh-syntax --exit-with-session`

This is used to start a user d-bus session (seperate from the system's) and remedies errors such as:

libnotify-Message: Unable to get session bus: Failed to execute dbus-launch to autolaunch D-Bus session

Further reading

For more information, see Gnome-do and compiz standalone and

man dbus-launch