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Date: Sun, 8 Dec 1996 19:30:02 -0800 (PST)
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From: Bruce Evans <bde@zeta.org.au>
Subject: Re: kern/2118: failure to write to vc w/o input
Reply-To: Bruce Evans <bde@zeta.org.au>
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The following reply was made to PR kern/2118; it has been noted by GNATS.

From: Bruce Evans <bde@zeta.org.au>
To: j@uriah.heep.sax.de, moke@winternet.com
Cc: freebsd-bugs@freebsd.org, sos@freebsd.org
Subject: Re: kern/2118: failure to write to vc w/o input
Date: Fri, 29 Nov 1996 21:18:36 +1100

 >> 	Text written to virtual consoles that are not waiting for input is
 >> 	not displayed. However once input is asked for, all lines pending
 >> 	will display.
 >
 >Uh, so perhaps _this_ is the reason why the emergency holographic
 >shell of 2.2's sysinstall vanishes when typing a command while the
 >installation is in progress?
 
 The tty plumbing for this is very strange:
 
 	$ cat >/dev/ttyv9		# on unused ttyv9
 	1
 	2
 	3
 	[pause]
 
 This gives no output on /dev/ttyv9.  Then on another tty:
 
 	$ cat /dev/ttyv9
 	1
 	2
 	3
 	$
 
 ttyv9 is acting like a pty.
 
 	$ cat /dev/ttyv9
 	1
 	2
 	3
 	$
 
 A buggy pty :-).  Now with the first cat terminated by ^D:
 
 	$ cat /dev/ttyv9
 	1
 	2
 	3
 	$
 
 A very buggy pty :-).
 
 Bruce