服务端

/*
* @Author: hohj
* @Date:   2020-12-13 14:14:49
* @Last Modified by:   hohj
* @Last Modified time: 2021-01-13 10:25:31
*/

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

int main(int argc, char const *argv[])
{
	int sockfd = socket(AF_INET, SOCK_STREAM,0 );

	struct sockaddr_in server;		//设置服务端地址信息
	server.sin_family = AF_INET;
	server.sin_addr.s_addr = inet_addr("192.168.33.1");
	server.sin_port = htons(8888);
	//绑定本地地址信息
	if(bind(sockfd, (struct sockaddr *)&server, sizeof(server))==-1){
		perror("bind()");
		exit(1);
	}
	//进入等待连接请求状态
	listen(sockfd, 5);
	
	struct sockaddr_in client;//创建sockaddr_in用于存储客户端地址信息
	socklen_t len = sizeof(client);

	int newfd = accept(sockfd, (struct sockaddr *)&client, &len);//接受客户端连接请求
	printf("%d, %d", sockfd, newfd);
	printf("before listen\n");
	char buff[10] = {0};//此处设置的buff大小只有10字节
	
	while(1) {
    	bzero(buff, sizeof(buff));
        int ret = read(newfd, buff, sizeof(buff));//读取buff大小（10）的数据，
        if(ret==0) exit(0);
        //recv(newfd, buff, sizeof(buff), 0);
        printf(RED"%d: %s(%d)： %s\n", newfd, inet_ntoa(client.sin_addr), ntohs(client.sin_port), buff); 
    }

	return 0;
}

客户端

/*
* @Author: hohj
* @Date:   2020-12-13 14:14:39
* @Last Modified by:   hohj
* @Last Modified time: 2021-02-01 15:24:30
*/
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/types.h>
#include <stdlib.h>
#include <arpa/inet.h>

int main(int argc, char const *argv[])
{
	int sockfd = socket(AF_INET, SOCK_STREAM, 0);//创建TCP套接字

	struct sockaddr_in server;			//创建sockaddr_in结构体（保存地址信息）
	server.sin_family = AF_INET;	//使用IPv4地址
	server.sin_addr.s_addr = inet_addr("192.168.33.20"); //服务器地址
	server.sin_port = htons(6666);	//服务器端口

	/*struct sockaddr_in client;
	client.sin_family = AF_INET;
	client.sin_addr.s_addr = inet_addr("127.0.0.1");
	client.sin_port = htons(6666);*/
	
	/*if(bind(sockfd, (struct sockaddr *)&client, sizeof(client))==-1){
		perror("bind()");
		exit(1);
	}*/
	//请求连接
	if(connect(sockfd, (struct sockaddr *)&server, sizeof(server))==-1){
		perror("connect()");
		exit(1);
	}
	printf("after connect\n");

	char buff[512] = {0};
	while(1) {
        bzero(buff, sizeof(buff));
        printf(">");
        scanf("%[^\n]s", buff);
        getchar();
        write(sockfd, buff, strlen(buff));//发送数据
        //send(sockfd, buff, strlen(buff), 0);
    }

	return 0;
}

编译
gcc client.c -o client
gcc server.c -o server

运行
服务端：./server

hohj@ubuntu20-10:~/Documents/C/tcp$ gcc server.c -o server
hohj@ubuntu20-10:~/Documents/C/tcp$ ./server 
3, 4before listen
4: 127.0.0.1(40258)： this is th
4: 127.0.0.1(40258)： e TCP conn
4: 127.0.0.1(40258)： ect servic
4: 127.0.0.1(40258)： es

客户端：./client

hohj@ubuntu20-10:~/Documents/C/tcp$ gcc server.c -o server
hohj@ubuntu20-10:~/Documents/C/tcp$ ./server 
3, 4before listen
4: 127.0.0.1(40258)： this is th
4: 127.0.0.1(40258)： e TCP conn
4: 127.0.0.1(40258)： ect servic
4: 127.0.0.1(40258)： es