Multiple IO usage

• Brief experimental steps ：

1)    Carry out orders gcc –o ioselect_server ioselect_client.c Generate executable files ioselect_server

2)    Carry out orders gcc –o ioselect_client ioselect_client.c Generate executable files ioselect_client

3)    perform ioselect_server

4)    Execute at two terminals respectively ioselect_client

5)    Send messages on two clients respectively , View results

Server side ioselect_server The code is as follows ：

#include <stdlib.h>

#include <stdio.h>

#include <unistd.h>

#include <sys/types.h>