Date: Sun, 7 Dec 1997 04:21:57 -0600 (CST) From: Jim Bryant <jbryant@unix.tfs.net> To: yokota@zodiac.mech.utsunomiya-u.ac.jp (Kazutaka YOKOTA) Cc: freebsd-current@freebsd.org Subject: Re: sc0 scrollback flaw Message-ID: <199712071021.EAA00984@unix.tfs.net> In-Reply-To: <199712070918.SAA13234@zodiac.mech.utsunomiya-u.ac.jp> from Kazutaka YOKOTA at "Dec 7, 97 06:18:38 pm"
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In reply:
> >hmmm... i just rebuilt using the SC_HISTORY_SIZE option for sc [good
> >idea, it was always a pain in the ass hacking up syscons.h to do this].
> >
> >there seems to be an undesireable new behavior for the sc scrollback
> >facility..
> >
> >one of the functions in my .login is a `clear` to clear the console
> >when i log in. this seems to erase the entire scrollback buffer. the
> >old behavior was to ignore screen clears in the buffer.
>
> ? My current box donsn't have this problem. The history buffer is
> intact after `clear'...
>
> >i'm still running the Dec. 2 version of -current, but will be
> >cvsupping the latest in a few minutes... i can take a look at
> >syscons.c, and see if i can find where this is happening...
>
> I did add SC_HISTORY_SIZE stuff to syscons.c. But, I never touched
> screen clearing part of the code, because SC_HISTORY_SIZE affects the
> driver only when the history buffer is allocated, which happens a) if
> the virtual console is opened for the first time, b) if the user runs
> `kbdcontrol -h lines' to set the history buffer size, c) or if the
> screen size is changed by `vidcontrol VGA_xxx'.
>
> I'm puzzled.
hmmm... just remembering, i do change the screen dimensions to 80x60,
but that is beside the point, as even asfter the switch, i still
retained the kernel boot messages before, and now everything prior to
login now is lost...
my .login is enclosed... btw: i guess i don't do a clear, and the
mode change does it.. note that clear is commented... sorry...
-----------------------
# $Id: dot.login,v 1.5 1994/06/15 22:58:47 jkh Exp $
#
umask 022
setenv TTY `/usr/bin/tty`
setenv LS -G
tset -Q \?$TERM
if ("$TERM" == "cons60") then
stty crt erase ^h
/usr/sbin/kbdcontrol -r fast
/usr/sbin/vidcontrol -t 300 cyan black
/usr/sbin/vidcontrol -f 8x8 /usr/share/syscons/fonts/cp437-thin-8x8.fnt
/usr/sbin/vidcontrol -f 8x14 /usr/share/syscons/fonts/cp437-8x14.fnt
/usr/sbin/vidcontrol -f 8x16 /usr/share/syscons/fonts/cp437-thin-8x16.fnt
/usr/sbin/vidcontrol VGA_80x60
/usr/sbin/vidcontrol -c destructive
stty rows 60
endif
if ("$TERM" == "vt420") then
stty `cat .tty`
stty rows 48 cols 132 erase ^\?
unsetenv LS
setenv LS
endif
#clear
w
echo ' '
cat /etc/motd.bill
echo ' '
/usr/games/fortune -a limerick startrek
echo ' '
jim
--
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