Answer Posted / the named one

http://www.cs.fredonia.edu/zubairi/s2k2/csit431/pipes.html
go to this link and then you can see the unnamed and named
pipes both given properly.
Unnamed pipes can be bidirectional or unidirectional both
ways . In previous Unix systems it was unidirectional that's
why it used to return two pointers but in New it is
bidirectional so it returns a pointer.

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