Raw advanced socket experiment

• Brief experimental steps ：

1)    Open the terminal to compile tcp_server.c,tcp_client.c Generate the corresponding executable file tcp_server,tcp_client.

2)    Open the terminal compilation separately raw.c Generate executable files raw.

3)    Run the executable raw.

4)    Run the executable files separately in other terminals tcp_server,tcp_client.

5)    Client input information , The server receives and returns to the client , At this time, a packet is generated , stay raw Terminal generates data .

raw.c The code is as follows ：

#include <sys/types.h>

#include <sys/socket.h>

#include <sys/ioctl.h>

#include <net/if.h>