Path: utzoo!utgpu!news-server.csri.toronto.edu!bonnie.concordia.ca!thunder.mcrcim.mcgill.edu!snorkelwacker.mit.edu!hsdndev!cmcl2!adm!smoke!gwyn
From: gwyn@smoke.brl.mil (Doug Gwyn)
Newsgroups: comp.unix.questions
Subject: Re: tty 8-bit output
Message-ID: <14960@smoke.brl.mil>
Date: 24 Jan 91 00:54:14 GMT
References: <1991Jan22.175816.12228@athena.mit.edu>
Organization: U.S. Army Ballistic Research Laboratory, APG, MD.
Lines: 18

In article <1991Jan22.175816.12228@athena.mit.edu> ckclark@athena.mit.edu (Calvin Clark) writes:
>Ok, I give up.  I am using the "new" Berkeley tty driver,
>as described in tty(4).  It is reasonably easy to get it
>to accept eight-bit input, by using 'stty pass8' or by
>setting the ioctl correctly.  However, it seems that if
>it is set in a mode which does *any* output processing
>at all, (i.e., anything but 'raw' or 'litout'), it 
>will strip the eighth bit off of the output characters.

There was a bug in the BSD tty handler that made it hard to get 8-bit
raw data through the handler.  However, the right combination of
set/get/set ioctls can work around the bug.

	stty( ofd, &ttyb );
	ioctl( ofd, TIOCLSET, &lflags );
	/* following 4.2BSD hack courtesy of Chris Torek */
	gtty( ofd, &ttyb );
	ioctl( ofd, TIOCSETN, &ttyb );	/* makes LLITOUT stick */