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From: kak@hico2.UUCP (Kris A. Kugel)
Newsgroups: comp.unix
Subject: conventions among ioctl commands
Keywords: ioctl 3b1 unixpc
Message-ID: <4757@gumby.Altos.COM>
Date: 2 Apr 91 18:13:26 GMT
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In the document "UNIX PC Version 3.0 Device Driver Development Guide",
R. D. Niehaus says [about ioctl parameters]:

	One particularly good idea is to have a common parameter
	among all drivers; one that would permit feedback from
	the driver about its type.  In this way, a process could
	verify just what device was attached to a file descriptor.

Does anybody know if such a convention exists?  I couldn't find
any common element in the /usr/include/sys/*ioctl*.h files I looked at.

                               Kris A. Kugel
                             ( 908 ) 842-2707
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