stdin broken for windows console app under rxvt

["Robinson, Mark" <Mark dot Robinson at vignette dot com>]

Greetings

A simple console app compiled with MingW (-mno-cygwin) (or VC++) cannot
read from stdin when executed in an rxvt or xterm terminal:

#include <stdio.h>
main() {
  int c;
  fputc(isatty(stdin), stdout);
  while ((c = getc(stdin)) != EOF) fputc(c, stdout);
}

Furthermore, isatty(stdin) returns 0.

Both examples behave under cmd, or cmd/bash with CYGWIN=notty set, or if
they're compiled without the mingw flag.

Any clues gratefully accepted.

cheers
mark

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