Terminal handling with the 990809 snapshot

[Glenn Spell <glenn@gs.fay.nc.us>]

The 990809 snapshot seems to have corrected the get_signal_mutex
and the CTRL-C problems, at least the ones I saw on Win95.

There are two issues remaining that I'd like to get on the table
before the next release. Both involve terminal/console handling.

First, an issue with "ls --color" and the console screen on Win95.
(This is of interest to me only if it's likely that whatever is
causing this may also cause other more significant problems.)

This only happens with "tty" set. With "notty", it's normal.

If I log into Cygwin with any shell and immediately issue the
command "ls --color", I can see the color appear for an instant,
but then it disappears and everything is black and white. If I
continue issuing the same command, somewhere around the third to
the fifth try... the color will "stick".

This behavior started with the 990626 snapshot and continues thru
the 990809 snapshot.

Last (but as they say, not least), the 990614 thru and including
the 990628 snapshots were the only ones, until recently, where
issuing a "CTRL-A \" command in 'screen' would exit all running
processes before terminating 'screen'. (I had always used "tty"
with 'screen' until just yesterday so I don't know how those
snapshots behaved with "notty".)

Now, with both the 990808 and the 990809 snapshots, 'screen' will
exit all processes before terminating. That's good. Thanks, Chris.

However, 'screen' now only runs properly with "notty" set.

I can best explain all this by illustrating the display.

First, I'd like to illustrate that it works with "notty" set.
The next two illustrations are with starting 'screen' from
a bash login shell and four windows being started via
the .screenrc file with bash running in each window. My comments
are in parenthesis.

    (This is with 990808 and "notty":)
BASH-2.03$ ps
    PID TTY     STIME COMMAND
   10001073741824  19:12:04 /USR/BIN/BASH.EXE
   10011073741824  19:12:07 /BIN/SCREEN.EXE
   1002  -1  19:12:08 /BIN/SCREEN.EXE
   1003   0  19:12:08 /USR/BIN/BASH.EXE
   1004   1  19:12:09 /USR/BIN/BASH.EXE
   1005   2  19:12:10 /USR/BIN/BASH.EXE
   1006   3  19:12:12 /USR/BIN/BASH.EXE
   1007   3  19:12:41 /USR/NEW-WINSUP/BIN/PS.EXE
BASH-2.03$ (CTRL-A \ issued)
[screen is terminating]
BASH.EXE-2.03$ ps
    PID TTY     STIME COMMAND
   1000  -1  19:12:04 /USR/BIN/BASH.EXE
   1008  -1  19:12:59 /USR/NEW-WINSUP/BIN/PS.EXE
BASH.EXE-2.03$

    (This is with 990809 and "notty" (better :-)):)
BASH-2.03$ ps
    PID TTY     STIME COMMAND
   1000  -1  19:19:41 /USR/BIN/BASH.EXE
   1009  -1  19:20:17 /BIN/SCREEN.EXE
   1010  -1  19:20:17 /BIN/SCREEN.EXE
   1011   0  19:20:17 /USR/BIN/BASH.EXE
   1012   1  19:20:18 /USR/BIN/BASH.EXE
   1013   2  19:20:19 /USR/BIN/BASH.EXE
   1014   3  19:20:21 /USR/BIN/BASH.EXE
   1015   3  19:20:28 /USR/NEW-WINSUP/BIN/PS.EXE
BASH-2.03$ (CTRL-A \ issued)
    (The next line actually moves to bottom of display)
[screen is terminating]
BASH.EXE-2.03$ ps
    PID TTY     STIME COMMAND
   1000  -1  19:19:41 /USR/BIN/BASH.EXE
   1016  -1  19:21:11 /USR/NEW-WINSUP/BIN/PS.EXE
BASH.EXE-2.03$

But there's a problem when "tty" is set. My guess is that some
buffer is not getting flushed at the right times.

The remaining illustrations are with 'screen' being the login
shell and four windows starting up via the .screenrc file with
bash running in each window.

This is using the 990809 snapshot with "tty" set. My comments are
in parenthesis. I'm starting 'screen' from "cygnus.bat".

(The status line at bottom of display does not disappear and the
prompt for the last window does not appear. I press RETURN, the
status line disappears but still no prompt. I press RETURN a
second time, a prompt appears.)
BASH-2.03$

(I press RETURN a third time, no change. I press RETURN a fourth
time, two more prompts appear.)
BASH-2.03$
BASH-2.03$
BASH-2.03$

(I press "p", no change. I press "s", two more prompts appear.)
BASH-2.03$
BASH-2.03$
BASH-2.03$
BASH-2.03$
BASH-2.03$

(I press RETURN, no change. I press RETURN again, "ps" appears
and the title changes to "ps" and back to "screen".)
BASH-2.03$
BASH-2.03$
BASH-2.03$
BASH-2.03$
BASH-2.03$ ps

(I press RETURN, no change. Press RETURN again, I get a partial
display of the output of 'ps'.)
BASH-2.03$
BASH-2.03$
BASH-2.03$
BASH-2.03$
BASH-2.03$ ps
    PID TTY     STIME COMMAND
   1000   0  19:47:57 /BIN/SCREEN.EXE
   1001  -1  19:47:57 /BIN/SCREEN.EXE
   1002   1  19:47:58 /USR/BIN/BASH.EXE
   1003   2  19:47:59 /USR/BIN/BASH.EXE
   1004   3  19:48:00 /USR/BIN/BASH.EXE
   1005   4  19:48:01

(Press RETURN again, the rest of the output of 'ps' appears
plus an additional two prompts.)
BASH-2.03$
BASH-2.03$
BASH-2.03$
BASH-2.03$
BASH-2.03$ ps
    PID TTY     STIME COMMAND
   1000   0  19:47:57 /BIN/SCREEN.EXE
   1001  -1  19:47:57 /BIN/SCREEN.EXE
   1002   1  19:47:58 /USR/BIN/BASH.EXE
   1003   2  19:47:59 /USR/BIN/BASH.EXE
   1004   3  19:48:00 /USR/BIN/BASH.EXE
   1005   4  19:48:01 /USR/BIN/BASH.EXE
   1006   4  19:52:50 /USR/NEW-WINSUP/BIN/PS.EXE
BASH-2.03$
BASH-2.03$

(Press RETURN, no change. Press RETURN again, three more prompts
appear. From now on, it takes two presses of RETURN to produce
a change and the change is, two prompts appear.)

-glenn

-- 
 )      Glenn Spell <glenn@gs.fay.nc.us>      )   _       _____
 )   Fayetteville, North Carolina, U. S. A.   )_ (__\____o /_/_ |
 )  _  _  _  _  _  _  _  _  _  _  _  _  _  _  )   >-----._/_/__]>
 )- blue skies - happy trails - sweet dreams -)             `0  |