While looking at the FIFO implementation, I understand that a FIFO is
implemented as a socket.  But I am not sure where the data in a FIFO
is stored (mbuf or filesystem buf structure?) and how it manages the
red/write pointers.  Can anyone give me a general picture of this?

Any help is appreciated.

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Zhihui Zhang.  Please visit http://www.freebsd.org
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