CygPerl hangs opening FIFO after fork (in both parent&child)

[Linda Walsh]

The attached test case is simple and fairly short.  It does not
depend on File::BOM (and has none of the code from it).

It's only dependency (other than perl) is the POSIX module,
where, from, the "fifo" command is taken.

Conceptually, it is simple:

- Create fifo (works)
- Fork        (works)
- Open fifo for communication between parent and child      (FAILS)

    (if successful, try to pass a short message, from child to
    parent, parent validates, then both processes exit)
---------
    Both the child and the parent hang on the "open".

Fork by itself works. 
Fifo communication, by itself, works.

Is this a simple enough test case?
Linda


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