Output to control terminal

[RT Happe <rthappe@mathematik.uni-freiburg.de>]

I cannot write to the control terminal opened as input file, then dupped.

[ Linux PC, kernel 2.2.17 ]
Welcome to scsh 0.6.2 (Gambit-C 4.0) Type ,? for help.
> (close-after (dup->outport (open-input-file (control-tty-file-name)))
               (lambda (op) (display 'beep op)))
Error: exception
       os-error
       (channel-maybe-write '#{Byte-vector 98 101 101 112 0 0 ---} 0 4
'#{Output-channel 4} "Bad file descriptor")


rthappe