How to convert Fortran logical units to file descriptors in C ?

[Lyndon VanWagner]

We do mixed language programming, and I've come across the case
where I want to convert a Fortran logical unit to its underlying
file descriptor number.  SunOS 4+ Fortran supports this with
the getfd (3f) call, but Ultrix 4.1+ RISC (DecStation) 
Fortran doesn't supply this function.

Has anyone else tried to do this?
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