ftruncate(2) for System V.3.2 needed

[Jos Vos]

I need the ftruncate(2) function from BSD4.3 UNIX on System V.3.2.
For non-BSD-manual-owners, here's the description of ftruncate(2):

*	ftruncate (fd, length)
*	int fd;
*	long length;
*
*   Ftruncate causes the file referenced by fd (a file descriptor of an
*   file open for writing) to be truncated to at most length bytes in size.
*   If the file previously was larger than the size, the extra data is lost.

Hint: I do *not* know the filename of the open file, of course :-)

Because I don't even know if there exists a solution, also a *proof* :-)
that no solution exists will be very helpfull to me (than I can start
rewriting the code around ftruncate() in my application :-( ).

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