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SIGINT handling

Is it normal behaviour for an interactive es shell to exit after receiving two 
interrupt signals?  They don't even have to be consecutive, I can do the 
following:

     ; ^C
     ; ls
     ...
     ; ^C
     (shell exits)

I am using es-0.84, on HP-UX 9.0.5, compiled with '-Ae +ESlit +O3 -DHPUX'.

Thanks,
-scott
--
   _/    _/   _/_/_/  _/_/_/_/   _/_/_/  Scott C. Gray (gray@nas.nasa.gov)
  _/_/  _/  _/    _/ _/_/      _/    _/  NASA Ames Research M/S 258-6
 _/  _/_/  _/_/_/_/     _/_/  _/_/_/_/   For PGP public key, send me mail
_/    _/  _/    _/ _/_/_/_/  _/    _/    with subject line of "PGP request".