Tcp/Ip协议理解_简单实例

#include <stdio.h>
#include<sys/socket.h>
#include <sys/types.h>
#include<arpa/inet.h>
#include <string.h>
#include <unistd.h>
#include <stdlib.h>
#include <fcntl.h>

#define MYPORT 6666
#define QUEUE 20
#define BUFFER_SIZE 1024

int main() {

    int server_socket = socket(AF_INET,SOCK_STREAM,0);

    struct sockaddr_in server_sockaddr;
    server_sockaddr.sin_family = AF_INET;
    server_sockaddr.sin_port = htons(MYPORT);
    server_sockaddr.sin_addr.s_addr = htonl(INADDR_ANY);

    if(bind(server_socket,(struct sockaddr*)&server_sockaddr, sizeof(server_sockaddr))==-1)
    {
        perror("listen");
        exit(1);
    }
    if(listen(server_socket,QUEUE)==-1){
        exit(1);
    }
    char buffer[BUFFER_SIZE];
    struct sockaddr_in client_addr;
    socklen_t length = sizeof(client_addr);
    int conn = accept(server_socket,(struct sockaddr*)&client_addr,&length);

    if(conn<0)
    {
        perror("connert");
        exit(1);
    }
    while (1)
    {
        memset(buffer,0, sizeof(buffer));
        if (strcmp(buffer,"exit
")==0){
            break;
        }
        fputs(buffer,stdout);
        send(conn,buffer,length,0);
    }
    close(conn);
    close(server_socket);


    return 0;
}