Linux系统是通过提供套接字(socket)来进行网络编程的.网络程序通过socket和其它几个函数的调用,会返

回一个 通讯的文件描述符,我们可以将这个描述符看成普通的文件的描述符来操作,这就是的设备无关性的好处

.我们可以通过向描述符读写操作实现网络之间的数据交流. -Linux system is through the provision of a socket (socket) to carry network programming. Networking program through the socket and several other functions of the call, will return a communication file descr iptor, we can use this as a common descr iptor file descr iptor to operate, and this is a device-independent nature of benefits. we can read and write operations to the descr iptor to achieve the exchange of data between networks.