Main Authors:
     Vincent Torri <vtorri at univ-evry dot fr>
     Tor Lillqvist <tml at iki dot fi> (pipe function)
     Lance Fetters
     Vincent Richomme <vrichomme at smartmobili dot com>
     Paul Vixie (ISC) (inet_pton function)
     Daniel Stenberg (inet_pton function)