Date: Fri, 29 Nov 1996 21:18:36 +1100 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 Message-ID: <199611291018.VAA21638@godzilla.zeta.org.au>
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>> 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
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