> > 3. Is it possible to automatically create a device file in /dev from a
> > module?
>
> Not really, at least not from a loaded kernel module.
sure you can. ipfilter was doing this back with LKMs in the 90s :-)
> BTW, devsw_attach() doesn't "automatically generate the major". It does
> a lookup in the majors table. If there is no entry in the table, you
> get an error.
see eg this line in devsw_attach():
newptr = kmem_zalloc(new * DEVSWCONV_SIZE, KM_NOSLEEP);
for what happens when the entry isn't found.
.mrg.
