2. Note that ct device uses ctau name as driver name (due to name conflict
with ct driver) and also mark it as a driver inside the CVS tree.
MFC after: 10 days
The nonstandard formatting made my mega-patch scripts miss it.
Retire the static major number while we're here anyway.
Reported by: Niels Chr. Bank-Pedersen <ncbp@bank-pedersen.dk>
This commit adds a couple of functions for pseudodrivers to use for
implementing cloning in a manner we will be able to lock down (shortly).
Basically what happens is that pseudo drivers get a way to ask for
"give me the dev_t with this unit number" or alternatively "give
me a dev_t with the lowest guaranteed free unit number" (there is
unfortunately a lot of non-POLA in the exact numeric value of this
number, just live with it for now)
Managing the unit number space this way removes the need to use
rman(9) to do so in the drivers this greatly simplifies the code in
the drivers because even using rman(9) they still needed to manage
their dev_t's anyway.
I have taken the if_tun, if_tap, snp and nmdm drivers through the
mill, partly because they (ab)used makedev(), but mostly because
together they represent three different problems for device-cloning:
if_tun and snp is the plain case: just give me a device.
if_tap has two kinds of devices, with a flag for device type.
nmdm has paired devices (ala pty) can you can clone either of them.
Free approx 86 major numbers with a mostly automatically generated patch.
A number of strategic drivers have been left behind by caution, and a few
because they still (ab)use their major number.
implementation writes directly to a file, similar to the Darwin,
Solaris, and whoever else implementations, rather than buffering
through a pseudo-device.
lots of old interfaces, and digi now supports all cards that dgb
supported. The author of the driver says that this is no longer
necessary.
Approved by: babkin@
is more robust and prevents the hijacking of /dev/console for the typical
mistake.
Remove unneeded MAJOR_AUTO uses, it is only needed explicitly now if the
driver source has cross-branch compatibility to old releases.
