linux socket回声服务器

server.cpp

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include<iostream>
using namespace std;
int main(){
    //创建套接字
    int serv_sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);

    //将套接字和IP、端口绑定
    struct sockaddr_in serv_addr;
    memset(&serv_addr, 0, sizeof(serv_addr));  //每个字节都用0填充
    serv_addr.sin_family = AF_INET;  //使用IPv4地址
    serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");  //具体的IP地址
    serv_addr.sin_port = htons(1234);  //端口
    bind(serv_sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr));

    //进入监听状态，等待用户发起请求
    listen(serv_sock, 20);

	while(1)
	{
	    //接收客户端请求
	    struct sockaddr_in clnt_addr;
	    socklen_t clnt_addr_size = sizeof(clnt_addr);
	    int clnt_sock = accept(serv_sock, (struct sockaddr*)&clnt_addr, &clnt_addr_size);
	
	    //向客户端发送数据
	    char buffer[200];
		read(clnt_sock,buffer, sizeof(buffer)-1);
		cout<<buffer<<endl;
		write(clnt_sock, buffer, sizeof(buffer));
	   	close(clnt_sock);
	}
    //关闭套接字
    close(serv_sock);

    return 0;
}

client.cpp

#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <sys/socket.h>
#include<iostream>
using namespace std;
int main(){
    //创建套接字
    int sock = socket(AF_INET, SOCK_STREAM, 0);

    //向服务器（特定的IP和端口）发起请求
    struct sockaddr_in serv_addr;
    memset(&serv_addr, 0, sizeof(serv_addr));  //每个字节都用0填充
    serv_addr.sin_family = AF_INET;  //使用IPv4地址
    serv_addr.sin_addr.s_addr = inet_addr("127.0.0.1");  //具体的IP地址
    serv_addr.sin_port = htons(1234);  //端口
    connect(sock, (struct sockaddr*)&serv_addr, sizeof(serv_addr));
   
    //读取服务器传回的数据
	char buffer[200];
	cin>>buffer;
	write(sock, buffer, sizeof(buffer));
	read(sock, buffer, sizeof(buffer)-1);
	printf("Message form server: %s\n", buffer);
   
    //关闭套接字
    close(sock);

    return 0;
}