#include <stdio.h>
#include <stdlib.h>
#include <errno.h>
#include <string.h>
#include <sys/types.h>
#include <netinet/in.h>
#include <sys/socket.h>
#include <sys/wait.h>
#define SERVPORT 3333 /*服务器监听端口号 */
#define BACKLOG 10 /* 最大同时连接请求数 */
main()
{
    int sin_size=0;    
    unsigned int sockfd,client_fd; /*sock_fd：监听socket；client_fd：数据传输socket */
    struct sockaddr_in my_addr; /* 本机地址信息 */
    struct sockaddr_in remote_addr; /* 客户端地址信息 */
    if ((sockfd = socket(AF_INET, SOCK_STREAM, 0)) == -1) {
        perror("socket创建出错！"); exit(1);
    }
    my_addr.sin_family=AF_INET;
    my_addr.sin_port=htons(SERVPORT);
    my_addr.sin_addr.s_addr = INADDR_ANY;
    memset(&my_addr, 0, sizeof(my_addr));
    if (bind(sockfd, (struct sockaddr *)&my_addr, sizeof(struct sockaddr)) == -1) {
        perror("bind出错！");
        return 0;
    }
    if (listen(sockfd, BACKLOG) == -1) {
        perror("listen出错！");
        return 0;
    }

    while(1) {
        sin_size = sizeof(struct sockaddr_in);
        if ((client_fd = accept(sockfd, (struct sockaddr *)&remote_addr, &sin_size)) == -1) {
            perror("accept出错");
            continue;
        }
        printf("received a connection from %s\n", (char *)inet_ntoa(remote_addr.sin_addr));
        if (!fork()) { /* 子进程代码段 */
            if (send(client_fd, "Hello, you are connected!\n", 26, 0) == -1)
                perror("send出错！");
                close(client_fd);
                return 0;
        }
        close(client_fd);
    
    }
}

------解决方案--------------------
探讨

引用:
 C/C++ code#include <stdio.h>
 #include <stdlib.h>
 #include <errno.h>
 #include <string.h>
 #include <sys/types.h>
 #include <netinet/in.h>
 #include <sys/socket.h>