Anybody know off hand why calling ioctl(fd, QIOCGMAP, ...) on /dev/px0
would fail with ENOTTY? pxioctl() never gets entered, all I can see is
this in sys_generic.c and it can't possibly be the reason, can it?:

	/*
	 * Interpret high order word to find amount of data to be
	 * copied to/from the user's address space.
	 */
	size = IOCPARM_LEN(com);
	if (size > IOCPARM_MAX) {
		error = ENOTTY;
		goto out;
	}

It worked in April...

- ad