preventing FIFO from EOF

[rihad]

> BTW, buffer was written way back when memory was measured
> in kilobytes and the ethernet was 10 mgb, so things have changed a bit, and
> its effectivness is questionable :-)
> 
My scenario:

prog1 | prog2

where both are daemons. prog1 does all the work, and sends commands for 
prog2 to do when needed. I don't want prog1 to block while prog2 is busy 
executing the command. So a buffer is inserted between the two:

prog1 | buffer | prog2

Asynchronous execution of commands. It's as simple as that.