How can I get file name from a file descriptor?

[Doug Gwyn]

In article <20614 at adm.BRL.MIL> Pabbisetty.henr at xerox.com (Nagesh Pabbisetty) writes:
>If I hold the descriptor to a file, how can I find out the name of the file it points to?

There need not be any name associated with the descriptor,
or there may be several possible names by which one could
access the same object.  It sounds like you're trying to
solve the wrong problem..