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From: Karl.Kleinpaste@cbstr1.att.com
Newsgroups: comp.unix.questions,comp.unix.wizards
Subject: Re: 4.2BSD / System V ioctl questions
Message-ID: <350@cbstr1.att.com>
Date: Fri, 28-Aug-87 10:56:35 EDT
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Posted: Fri Aug 28 10:56:35 1987
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davy@ea.ecn.purdue.edu writes:
>  The System V ioctl is a gross hack.

The SysV termio ioctl() is wonderfully orthogonal, as compared to the
random cruft stuffed into the tchars structure, the "local mode word"
crap, and ltchars structures of BSD.  The cc[] array is just begging
for organized extensions; just change NCC and add new #definitions for
the new slots, and you can do with it what you will.  Phooey on BSD.

>	   tinfo.c_cc[EOF] = 1;		/* min chars to read */
>	   tinfo.c_cc[EOL] = 0;		/* timeout */

Forpetesake, if you're going to use the "min" and "time" fields,
kindly call them by their right names: VMIN and VTIME.  Use the names
as appropriate to the use of the fields.  Furthermore, you neglected
the leading V on the names you did use.  (Yes, overloading VEOF/VEOL
with VMIN/VTIME was not too bright.)

>  >	2.	are there (stty and gtty)-like calls available in System V.
>
>  Nope.  They're actually gone from 4.3BSD too; they're implemented as library
>  routines.

False.  There are stty/gtty compatibility routines in the kernel; you
can issue an actual stty() system call, which will take a V7-style
ioctl() package and perform some standardized conversions into the
SysV termio scheme.  There is still an <sgtty.h> file.

Karl