select기반 Server

select기반서버.cpp

select기반 1클라 1스레드(친구 과제용으로 맨듬)

참고 : https://www.joinc.co.kr/w/Site/Network_Programing/Documents/select

참고 : http://perfectchoi.blogspot.kr/2009/09/%EC%86%8C%EC%BC%93%EC%9D%98-%EC%9E%85%EC%B6%9C%EB%A0%A5-%EB%AA%A8%EB%8D%B8select-%EB%B0%B0%EC%97%B4-%EC%82%AC%EC%9A%A9.html