说明：  套接字一旦建立，通过套接字选项和I / O控制命令对各种属性进行操作，便可对套接字的 行为产生影响。有的选项只用于信息的返回，而有的选项则可在应用程序中影响套接字的行 为。I / O控制命令肯定会对套接字的行为产生影响。
(socket once established, through socket options and I/O control commands to various attributes operation, the socket can affect the actions. Some options only for the return of information, but some of the options may affect the application of the socket. I/O control commands socket will certainly affect the actions.)