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CentOS 4.8 |
i386 |
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dbus-launch(1) |
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dbus-launch − Utility to start a message bus from a shell script
dbus-launch [−−version] [−−sh-syntax] [−−csh-syntax] [−−auto-syntax] [−−exit-with-session] [−−config-file=FILENAME] [PROGRAM] [ARGS...]
The dbus-launch command is used to start dbus-daemon-1 from a shell script. It would normally be called from a user’s login scripts. Unlike the daemon itself, dbus-launch exits, so backticks or the $() construct can be used to read information from dbus-launch.
With no arguments, dbus-launch will simply print the values of DBUS_SESSION_BUS_ADDRESS and DBUS_SESSION_BUS_PID.
You may specify a program to be run; in this case, dbus-launch will then set the appropriate environment variables and execute the specified program, with the specified arguments. See below for examples.
Finally, you may use the −−sh-syntax, −−csh-syntax, or −−auto-syntax commands to cause dbus-launch to emit shell code to set up the environment. This is useful in shell scripts.
With the −−auto-syntax option, dbus-launch looks at the value of the SHELL environment variable to determine which shell syntax should be used. If SHELL ends in "csh", then csh-compatible code is emitted; otherwise Bourne shell code is emitted. Instead of passing −−auto-syntax, you may explicity specify a particular one by using −−sh-syntax for Bourne syntax, or −−csh-syntax for csh syntax. In scripts, it’s more robust to avoid −−auto-syntax and you hopefully know which shell your script is written in.
See http://www.freedesktop.org/software/dbus/ for more information about D-BUS. See also the man page for dbus-daemon-1.
Here is an example of how to use dbus-launch with an sh-compatible shell to start the per-session bus daemon:
## test for an
existing bus daemon, just to be safe
if test -z "$DBUS_SESSION_BUS_ADDRESS" ; then
## if not found, launch a new one
eval ’dbus-launch --sh-syntax
--exit-with-session’
echo "D-BUS per-session daemon address is:
$DBUS_SESSION_BUS_ADDRESS"
fi
You might run something like that in your login scripts.
Another way to use dbus-launch is to run your main session program, like so:
dbus-launch gnome-session
The above would likely be appropriate for ~/.xsession or ~/.Xclients.
The following
options are supported:
--auto-syntax
Choose −−csh-syntax or −−sh-syntax based on the SHELL environment variable.
--config-file=FILENAME
Pass −−config-file=FILENAME to the bus daemon, instead of passing it the −−session argument. See the man page for dbus-daemon-1
--csh-syntax
Emit csh compatible code to set up environment variables.
--exit-with-session
If this option is provided, a persistent "babysitter" process will be created that watches stdin for HUP and tries to connect to the X server. If this process gets a HUP on stdin or loses its X connection, it kills the message bus daemon.
--sh-syntax
Emit Bourne-shell compatible code to set up environment variables.
--version
Print the version of dbus-launch
See http://www.freedesktop.org/software/dbus/doc/AUTHORS
Please send bug reports to the D-BUS mailing list or bug tracker, see http://www.freedesktop.org/software/dbus/
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dbus-launch(1) | |