hangling interrupt

[Igor Schein <igor@txc.com>]

Hi,

Don't try this in a gp session you care about:

k=0;while(k++,print(k);system("sleep 1"))

Now that's what I call a true infinite loop, the one you cannot break
out of. Even ^\ doesn't work, only ^Z and good-bye session.  I have a
feeling it's non-trivial to handle this scenario properly.

Thanks

Igor