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How do you create a file descriptor from memory (oposite of mmap)?

If mmap maps a file or device into memory, how do I do the reverse?
I have some already-allocated memory, and I want to create a file
descriptor from it that I can pass around.  (shm_open doesn't do this,
because I already have allocated memory.)

Apparently Windows can do this:  you can create a handle from some
arbitrary region of user-allocated memory.  Can Linux?

Thanks,
Dave

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