On Tue, 20 Nov 2001, Sean Morrell wrote:

Actually, the driver is for an audio device. And the user space

application is nothing more than a system preference pane, needed only to

configure the device. The audio device has some pecularities making it

unconfigurable using the typical CoreAudio interface. I do have the

option of using an Audio HAL Plug-In. But I just wanted to see if another

IPC method might quicken the development. At this time, I simply need a

one way notification to the driver. Eventually the driver will need to

respond to the preference pane, returning small structures of data. In

both cases, what IPC would you recommend?

I'd probably just throw a sysctl at it, make it a SYSCTL_PROC so that it calls a routine in the driver that stores the value. You can also use the same mechanism to read back the values the driver is currently using. Should work pretty well for tuning small parameters in a driver or other parts of the kernel. Also has the advantage of being a pretty standard BSD-ism. Later, David --------------------------------------------------------------------- Check out my weekly web comic: http://www.techmagazine.org