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This is a program designed initially to speed up writing tapes on remote
tape drives, but may be used as a general pipe buffering utility.
Note: You must have SYSVSHM support in FreeBSD kernel.
The program splits itself into two processes. The first process reads
(and reblocks) from stdin into a shared memory buffer. The second
writes from the shared memory buffer to stdout. Doing it this way
means that the writing side effectly sits in a tight write loop and
doesn't have to wait for input. Similarly for the input side. It is
this waiting that slows down other reblocking processes, like dd.
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