sockets（套接字）编程有三种，流式套接字（SOCK_STREAM），数据报套接字 （SOCK_DGRAM），原始套接字（SOCK_RAW）；基于TCP的socket编程是采用的流式套接字(SOCK_STREAM)。基于UDP采 用的数据报套接字(SOCK_DGRAM).-sockets (socket) programming there are three kinds of stream sockets (SOCK_STREAM), datagram sockets (SOCK_DGRAM), raw sockets (SOCK_RAW)　based on TCP-socket programming is used in streaming socket the word (SOCK_STREAM). Based on UDP datagram sockets used in (SOCK_DGRAM).