Date: Fri, 30 Jul 1999 01:05:52 -0700 From: Mike Smith <mike@smith.net.au> To: Brian McGovern <bmcgover@cisco.com> Cc: hackers@freebsd.org Subject: Re: reserved/local ioctl values? Message-ID: <199907300805.BAA01302@dingo.cdrom.com> In-Reply-To: Your message of "Tue, 27 Jul 1999 09:52:29 EDT." <199907271352.JAA09275@bmcgover-pc.cisco.com>
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> 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. \\ msmith@freebsd.org \\ -- Joseph Merrick \\ msmith@cdrom.com To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-hackers" in the body of the message
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