I've  just send-pr'ed a clone device driver (pr kern/6060).

To installl it just add option CLONE and pseudo-device   clonedev 
to your config file.

This does the same as a SYSVR4 clone-device.

The option CLONE enables clone support for ALL device drivers 
by a small change in specfs.
The device open function is called with an additional parameter,
which is a pointer to dev_t. If this changed than the open will
be for the changed device. 
This enables stuff like bpf to have just one device in /dev and should
simplify the compat-svr4 stuff.
BTW. Any device can be cloned, not just streams as in vanilla SYSVR4.

A clone device is also included.

For details see the man-page.

Stefan

--
Stefan Grefen                                Tandem Computers Europe Inc.
grefen@hprc.tandem.com                       High Performance Research Center
Committee, n.:
        A group of men who individually can do nothing but as a group
	decide that nothing can be done.
			-- Fred Allen