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Ken Brown 6d11d689a1 Cygwin: FIFO: add shared memory
Even though we currently allow a FIFO to be opened for reading only
once, we can still have more than one reader open because of dup and
fork.  Add a named shared memory section accessible to all readers of
a given FIFO.  In future commits we will add information needed by all
readers to this section

Add a class fifo_shmem_t that lets us access this information.

Add a method create_shmem that is called when a reader opens, and add
a method reopen_shmem that is called by dup, fork, and exec.  (Each
new reader needs its own view of the shared memory.)
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