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From: rjk@mrstve.UUCP
Newsgroups: comp.sys.att,comp.bugs.sys5
Subject: bug in 3b2 console driver?
Message-ID: <681@mrstve.UUCP>
Date: Thu, 23-Apr-87 15:49:33 EST
Article-I.D.: mrstve.681
Posted: Thu Apr 23 15:49:33 1987
Date-Received: Sat, 25-Apr-87 09:03:41 EST
Organization: Mr sTVe's, Lafayette IN
Lines: 25
Xref: utgpu comp.sys.att:321 comp.bugs.sys5:109


I came across what looks like a bug in the console driver on the 3b2/400
running System 5.3.  I've been trying to install Scheme (thanks Bob),
and had severe problems with garbage on the screen (an AT&T 610 terminal).
I thought it was either a problem with the way Scheme controled the terminal
or a bad terminfo description, until I happened to try it on a 610 on a
different port and it worked perfectly.

After some tom-foolery we needn't go into now, I came up with the following:

For messages to the console, Scheme does (essentialy) this:

printf("message, no newline");
fflush(stdout);

which seems to work perfectly on anything except the console.
It works perfectly (so far) on the console if I add

ioctl(fileno(stdout), TCSBRK, 1); /* wait for output to drain */

after the fflush().  Has anyone seen this before?  As in, is it a 3b2
problem or System 5 problem?

-- 
Rich Kuhns		{ihnp4, decvax, etc...}!pur-ee!pur-phy!mrstve!rjk