In situe :
Hopefully this little diagram helps make things a little clearer in
regards to the direction in which backPipe goes in a chain of pipes.
pipe pipe pipeface
sock crypt spurt raw
+-----------+ +-----------+ +-----------+ +-----------+
NULL<-backPipe |<--backPipe |<--backPipe |<--backPipe |
|forwardPipe->|forwardPipe->|forwardPipe->|forwardPipe->NULL
+-----------+ +-----------+ +-----------+ +-----------+
The short description of the backward pipe is that it reverses the
direction of the previous pipe (the one to the left on a protocol
parameter).
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