> I'l looking at defining about a dozen ioctl calls for a local device driver. > When looking at the _IO, _IO, _IOW, _IOR, and _IOWR macros, I'm interested if > there are any "reserved" or "local" values for the first parameter?
Not really, as such. > In short, I'd hate to use a seemly unused value, just to suddenly be in > conflict with a major set of ioctls (particularly terminal, as this is the > type of driver it will be). Also, would it be wise to reuse an existing value? If you want to add private ioctls to a given subsystem, either pick an arbitrarily high function number, or another letter that's not commonly associated with that subsystem. Eg. I would probably pick 'z' if I were going to add a local ioctl to the tty subsystem. -- \\ The mind's the standard \\ Mike Smith \\ of the man. \\ msm...@freebsd.org \\ -- Joseph Merrick \\ msm...@cdrom.com To Unsubscribe: send mail to majord...@freebsd.org with "unsubscribe freebsd-hackers" in the body of the message