Using udev rules to launch an X application

Using udev rules to launch an X application

[Roshan Mansinghani]

I have the following line in 10-custom.rules:

BUS="usb", SYSFS{product}="Palm Handheld*", KERNEL="ttyUSB*",SYMLINK="pilot", 
MODE="666", RUN+="su - roshan -c '/usr/bin/jpilot'"

When I connect my palm pilot to my computer and press the hotsync button, udev 
correctly creates a symbolic link /dev/pilot.  However, the jpilot 
application is not launched.

As a test, I previously had changed the Run argument to :  

RUN+="su - roshan -c 'ls > /tmp/test'"

This worked as expected.  Is there anything special that needs to be done when 
the application is an X application rather than a CLI one?

Thanks.

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Re: Using udev rules to launch an X application

[Greg KH]

On Tue, Aug 08, 2006 at 07:04:57PM -0500, Roshan Mansinghani wrote:
> I have the following line in 10-custom.rules:
> 
> BUS="usb", SYSFS{product}="Palm Handheld*", KERNEL="ttyUSB*",SYMLINK="pilot", 
> MODE="666", RUN+="su - roshan -c '/usr/bin/jpilot'"
> 
> When I connect my palm pilot to my computer and press the hotsync button, udev 
> correctly creates a symbolic link /dev/pilot.  However, the jpilot 
> application is not launched.
> 
> As a test, I previously had changed the Run argument to :  
> 
> RUN+="su - roshan -c 'ls > /tmp/test'"
> 
> This worked as expected.  Is there anything special that needs to be done when 
> the application is an X application rather than a CLI one?

Yes, you need to set up the X environment properly, as you are being
spawned as root, from a daemon.  That doesn't make it simple to run X
programs :)

good luck,

greg k-h

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Re: Using udev rules to launch an X application

[Kay Sievers]

On Tue, 2006-08-08 at 19:04 -0500, Roshan Mansinghani wrote:
> I have the following line in 10-custom.rules:
> 
> BUS="usb", SYSFS{product}="Palm Handheld*", KERNEL="ttyUSB*",SYMLINK="pilot", 
> MODE="666", RUN+="su - roshan -c '/usr/bin/jpilot'"
> 
> When I connect my palm pilot to my computer and press the hotsync button, udev 
> correctly creates a symbolic link /dev/pilot.  However, the jpilot 
> application is not launched.
> 
> As a test, I previously had changed the Run argument to :  
> 
> RUN+="su - roshan -c 'ls > /tmp/test'"
> 
> This worked as expected.  Is there anything special that needs to be done when 
> the application is an X application rather than a CLI one?

Never start any long-running application from an udev event process
without detaching and changing the session, it will block the event
process and may break udev's operation until udev's timeout will kill
it.

It can't work for X, and udev is not the right place to do such stuff
anyway. Use HAL, run something in your user session, that is already
connected to X, listens to HAL and starts your application, when you get
a signal from HAL, that a device with a matching capability has shown
up.

Kay


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