Re: [TUHS] Research UNIX on the AT&T 3B2?

[Greg 'groggy' Lehey <grog@lemis.com>]

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On Wednesday, 29 August 2018 at 10:41:02 -0400, Dan Cross wrote:
> On Wed, Aug 29, 2018 at 10:26 AM Theodore Y. Ts'o <tytso@mit.edu> wrote:
>
>> On Wed, Aug 29, 2018 at 03:06:40PM +1000, Greg 'groggy' Lehey wrote:
>>>> In BSD 4.3 and early Linux (which is when I still was maintaining
>>>> Linux's serial driver) you always had to do:
>>>>
>>>>     stty dec < /dev/ttyS0
>>>
>>> Checking mckusick's source distribution, it seems that the -f option
>>> (along with sanity) came in with 4.4BSD.  It was in the original
>>> sources imported into FreeBSD.  4.3BSD had such a bizarre syntax that
>>> I suspect whatever you emulated must have come from a later date.
>>
>> BSD 4.4 Lite was released in 1994.  (Lite2 was released in 1995.)
>>
>> Linux was started in 1991, and we had a stty from very early on --- by
>> 1992 at the latest.

Right, which is why I wrote

  I suspect whatever you emulated must have come from a later date.

In case that wasn't clear, I meant a later date than 4.3BSD.

> I think that Greg is slightly mistaken; `stty` had `-f` documented
> in Net/2 (1991, though of course the entanglements there have been
> discussed), but the option existed in Reno (1990, though it seems to
> be absent from the man page).

No, this is exactly what I suspected, but was too lazy to check up on.
I don't have sources for Tahoe, Reno or Net/2 on my machine, but
FreeBSD 1.0 stty.c has:

  static char sccsid[] = "@(#)stty.c	5.28 (Berkeley) 6/5/91";

And it has the -f flag.  This was (just) before the very first version
of Linux.  My understanding is that FreeBSD 1.0 was primarily derived
from Net/2.  Of course, there's no reason to have chosen that version.

Greg
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