From owner-freebsd-hackers  Fri Oct 24 15:17:04 1997
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Date: Fri, 24 Oct 1997 15:12:48 -0700 (PDT)
From: "Jamil J. Weatherbee" <jamil@trojanhorse.ml.org>
To: freebsd-hackers@freebsd.org
Subject: ioctl() base command groups
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Are the groups used in the _IO* macros, which are usually a single
character supposed to have some systematic system of assignment?