Roland Mainz wrote:
> I hit another bug related to SIGTTOU when an editor like /usr/bin/vi or
> /usr/bin/vim is accidently launched as background process via $ vi file
> & #.
>
> Steps to reproduce (for ast-ksh.2009-06-22):
> 1. Start ksh93 with "gmacs" editor mode
> $ ksh93 -o gmacs
> 2. Start "vi" as _background_ process like this:
> $ vi mytestfile.txt &
> (Process gets stopped with SIGTTOU)
> 3. Get "vi" process in the foreground:
> $ fg
> 4. Quit "vi" via "!:q"
>
> Result:
> ksh93's input mode only prints "> " for every key pressed. Somehow it
> seems the shell doesn't reset the editor mode state after "vi" quits...
> ;-(
It seems Solaris /usr/bin/stty can be used to undo the damage. Below is
the diff of the "stty" output between a normal dtterm/xterm session
("xworking") and after the shell enteres the "> " mode ("xnotworking"):
-- snip --
--- xworking Thu Aug 13 09:56:59 2009
+++ xnotworking Thu Aug 13 09:57:17 2009
@@ -1,5 +1,6 @@
speed 9600 baud; -parity
rows = 24; columns = 162; ypixels = 466; xpixels = 1144;
-erase = ^h; swtch = <undef>;
-brkint -inpck -istrip icrnl -ixany ixoff onlcr tab3
-echo echoe echok echoctl echoke iexten
+min = 1; time = 0;
+erase = ^h; eof = ^a; swtch = <undef>; dsusp = <undef>; rprnt =
<undef>; flush = <undef>; werase = <undef>; lnext = <undef>;
+brkint -inpck -istrip -ixany ixoff onlcr tab3
+-icanon -echo echoe -echok echoctl echoke iexten
-- snip --
Or different view (one properly per line (but a bit garbled)):
-- snip --
$ diff -u <( cat xworking | tr ' ' $'\n' | sort -u ) <( cat xnotworking
| tr ' ' $'\n' | sort -u )
--- /dev/fd/4 Thu Aug 13 10:05:11 2009
+++ /dev/fd/5 Thu Aug 13 10:05:11 2009
@@ -1,32 +1,43 @@
=
+0;
+1;
1144;
162;
24;
466;
9600
+^a;
baud;
brkint
columns
-echo
+dsusp
+-echo
echoctl
echoe
-echok
+-echok
echoke
+eof
erase
+flush
^h;
-icrnl
+-icanon
iexten
-inpck
-istrip
-ixany
ixoff
+lnext
+min
onlcr
-parity
rows
+rprnt
speed
swtch
tab3
+time
<undef>;
+werase
xpixels
ypixels
-- snip --
Just setting "stty echo" seems to be a basic cure for the problem...
... question is... is this the right thing to do in this case (I don't
know much about this part of the terminal stuff) ?
----
Bye,
Roland
--
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