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> One ugly way is to close the file descriptor behind the standard C
> library's back. You could add a routine to your test harness that in
> effect performs
>   close(fileno(file));
> It's ugly but it works.

It is ugly but it is simple :)  And it seems to work!

But when I tested it and I saw the error message (Bad file descriptor),
I became even ashamed of my question. For my specific requirments,
simply opening the file in "write" mode would be enough :)

  f ="temp", "w")
  --> nil	Bad file descriptor	9

Anyway, thanks for all the suggestions; there were sereval interesting
stuff there (and this specific one that reminded me of that kind of

-- Roberto