a problem in the tty mode

[Kazuhiro Fujieda]

When I use bash in tty mode, terminal options are occasionally
modified into random ones after typing a return key (possibly).

This problem always occurs suddenly. It is difficult to
duplicate it. I have experienced it several times in daily use
for recent two weeks on both NT4 and Win98.

I have this problem just now by good luck...
Look at the following strange session after it occurs.

~/cygwin $ speed 38400 baud; line = 0;
min = 1; time = 0;
-brkint -icrnl -imaxbel
-icanon -iexten -echo -echoe -echok -echoctl -echoke
~/cygwin $ stty: standard input: unable to perform all requested operations
~/cygwin $

In the line 1, I typed "stty" but it was not echoed back.
In the line 5, I typed "stty echo" but it was rejected.

I notice that the `echo' option is modified into `-echo'
whenever this problem occurrs.
____
  | AIST      Kazuhiro Fujieda <fujieda@jaist.ac.jp>
  | HOKURIKU  School of Information Science
o_/ 1990      Japan Advanced Institute of Science and Technology