http://www.ecst.csuchico.edu/~beej/guide/net/html/
http://www.developerweb.net/sock-faq/
http://unlser1.unl.csi.cuny.edu/faqs/sock-faq/html/unix-socket-faq.html
http://www.inf.pucrs.br/~cnunes/redes_si/sockets/udpClient.c
http://www.inf.pucrs.br/~cnunes/redes_si/sockets/udpServer.c