I ran the little test program on my 2.4.26 Knoppix system, and got the following two results:

 strace a.out < /dev/tty
  ...
  read(0, NULL, 6)                        = 1
  ...

 strace a.out < /dev/zero
  ...
  read(0, 0, 6)                           = -1 EFAULT (Bad address)
  ...

The first case looks broken.

Pat
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