misc/90524: reset doesn't fully restore terminal state

[Yuri]

>Number:         90524
>Category:       misc
>Synopsis:       reset doesn't fully restore terminal state
>Confidential:   no
>Severity:       non-critical
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:        
>Keywords:       
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sat Dec 17 02:00:09 GMT 2005
>Closed-Date:
>Last-Modified:
>Originator:     Yuri
>Release:        6.0-RELEASE
>Organization:
NA
>Environment:
FreeBSD xxx.xxx.xxx 6.0-RELEASE FreeBSD 6.0-RELEASE #0: Thu Nov  3 09:36:13 UTC 2005     root at x64.samsco.home:/usr/obj/usr/src/sys/GENERIC  i386
>Description:
If I kill vim (ex. kill -9) key mapping changes and backspace key causes printing of ^? instead of removing of the current character in terminal.

'reset' command doesn't restore this either. so it's no way to restore original setting besides of running the command 'stty erase ^?'

Originally 'stty -a' reports:
-----------begin------------------------
speed 38400 baud; 42 rows; 189 columns;
lflags: icanon isig iexten echo echoe echok echoke -echonl echoctl
        -echoprt -altwerase -noflsh -tostop -flusho pendin -nokerninfo
        -extproc
iflags: -istrip icrnl -inlcr -igncr ixon -ixoff ixany imaxbel -ignbrk
        brkint -inpck -ignpar -parmrk
oflags: opost onlcr -ocrnl -oxtabs -onocr -onlret
cflags: cread cs8 -parenb -parodd hupcl -clocal -cstopb -crtscts -dsrflow
        -dtrflow -mdmbuf
cchars: discard = ^O; dsusp = ^Y; eof = ^D; eol = <undef>;
        eol2 = <undef>; erase = ^?; erase2 = ^H; intr = ^C; kill = ^U;
        lnext = ^V; min = 1; quit = ^\; reprint = ^R; start = ^Q;
        status = ^T; stop = ^S; susp = ^Z; time = 0; werase = ^W;
-------------end------------------------

After killing vim and running 'reset' 'stty -a' reports:
-----------begin------------------------
speed 38400 baud; 42 rows; 189 columns;
lflags: icanon isig iexten echo echoe echok echoke -echonl echoctl
        -echoprt -altwerase -noflsh -tostop -flusho pendin -nokerninfo
        -extproc
iflags: -istrip icrnl -inlcr -igncr ixon -ixoff -ixany imaxbel -ignbrk
        brkint -inpck ignpar -parmrk
oflags: opost onlcr -ocrnl oxtabs -onocr -onlret
cflags: cread cs8 -parenb -parodd hupcl -clocal -cstopb -crtscts -dsrflow
        -dtrflow -mdmbuf
cchars: discard = ^O; dsusp = ^@; eof = ^D; eol = <undef>;
        eol2 = <undef>; erase = ^H; erase2 = ^H; intr = ^C; kill = ^U;
        lnext = ^V; min = 1; quit = ^\; reprint = ^R; start = ^Q;
        status = ^T; stop = ^S; susp = ^Z; time = 0; werase = ^W;
-------------end------------------------

because 'erase = ^H' particularly backspace key is disrupted.

>How-To-Repeat:
see full description
>Fix:
N/A
>Release-Note:
>Audit-Trail:
>Unformatted: