On Tue, 20 Nov 2001, Sean Morrell wrote:

What forms of IPC can be used for communicating between a user application

and a device driver?

Well, lots of stuff. That's kind of a broad question. You could use a sysctl, RPC, an ioctl, good old raw Mach IPC (ick).... It really depends on what you're trying to do. Are you writing a driver whose client is primarily in user space, or are you writing a driver for which you simply want to tune run-time parameters from user space? If you are just trying to tune parameters, I'd think you'd probably be best served by just adding a BSD sysctl or possibly an ioctl. If, however, the primary client is in user space, you should look into the way user clients/device interfaces are being done in other areas and consider adopting that design. Also, if your primary client is in user space, you should also consider writing your driver entirely in user space, rather than putting it in the kernel, then using sockets or posix shared memory or pipes to communicate with the driver. So again, what is it you're trying to do? :-) Later, David --------------------------------------------------------------------- Check out my weekly web comic: http://www.techmagazine.org