翻译这段代码并在每一行后进行注释int ret,listen_fd, client_fd; struct sockaddr_in server_addr, client_addr; socklen_t slen, clen = sizeof(client_addr); char recvBuffer[128] = {0}; char recCmd[128] = {0}; const int on = 1; listen_fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); if(listen_fd < 0) { printf("server socket failed\n"); exit(1); } server_addr.sin_family = AF_INET; server_addr.sin_port = htons(SERVERPT); server_addr.sin_addr.s_addr = htons(INADDR_ANY); slen = sizeof(server_addr); //绑定网络设备 setsockopt(listen_fd,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on)); ret = bind(listen_fd, (struct sockaddr *)&server_addr, slen); if(ret < 0) { printf("listen_fd bind failed\n"); exit(1); } ret = listen(listen_fd, 8); if(ret < 0) { printf("server listen failed\n"); exit(2); } //开始侦听客户端的连接请求 printf("Waiting connect.....\n"); client_fd = accept(listen_fd, (struct sockaddr *)&client_addr, (socklen_t *)&clen); if(client_fd < 0) { printf("server accept failed\n"); exit(3); } //连接成功，打印客户端的网卡信息 printf("client port: %d ,", ntohs(client_addr.sin_port)); printf("client ip: %s\n",inet_ntoa(client_addr.sin_addr)); while(1) { printf("Waiting recv.....\n"); ret = read(client_fd, recvBuffer, 128); if(ret < 0) printf("read failed\n"); else if(ret == 0) { //客户端下线 close(client_fd); break; } else { //打印接收到客户端信息 printf("client data: %s\n", recvBuffer); //给客户端回发信息 write(client_fd, "Successfully received your message!", 128); } }

/* 定义三个变量：ret, listen_fd, client_fd */
int ret, listen_fd, client_fd;
/* 定义两个结构体变量：server_addr, client_addr */
struct sockaddr_in server_addr, client_addr;
/* 定义两个变量：slen, clen，slen记录server_addr的大小，clen记录client_addr的大小 */
socklen_t slen, clen = sizeof(client_addr);
/* 定义两个字符数组：recvBuffer、recCmd，长度都为128，初始化为0 */
char recvBuffer[128] = {0};
char recCmd[128] = {0};
/* 定义一个常量on为1，表示开启相关选项 */
const int on = 1;
/* 创建一个TCP协议的套接字，返回一个文件描述符 */
listen_fd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
/* 如果listen_fd小于0，表示创建套接字失败，输出提示信息并结束程序 */
if(listen_fd < 0) {
printf("server socket failed\n");
exit(1);
}
/* 设置server_addr结构体的属性 */
server_addr.sin_family = AF_INET; //地址族为IPv4
server_addr.sin_port = htons(SERVERPT); //端口号，需要用htons转换为网络字节序
server_addr.sin_addr.s_addr = htons(INADDR_ANY); //IP地址，使用INADDR_ANY表示本机任意IP地址
slen = sizeof(server_addr); //记录server_addr结构体的大小
/* 设置socket选项，允许地址重用 */
setsockopt(listen_fd,SOL_SOCKET,SO_REUSEADDR,&on,sizeof(on));
/* 绑定网络设备和端口，将socket与server_addr绑定 */
ret = bind(listen_fd, (struct sockaddr *)&server_addr, slen);
/* 如果绑定失败，输出提示信息并结束程序 */
if(ret < 0) {
printf("listen_fd bind failed\n");
exit(1);
}
/* 开始侦听客户端的连接请求，最多连接8个客户端 */
ret = listen(listen_fd, 8);
/* 如果侦听失败，输出提示信息并结束程序 */
if(ret < 0) {
printf("server listen failed\n");
exit(2);
}
/* 输出等待客户端连接的提示信息 */
printf("Waiting connect.....\n");
/* 接受客户端连接请求，返回一个文件描述符 */
client_fd = accept(listen_fd, (struct sockaddr *)&client_addr, (socklen_t *)&clen);
/* 如果接受请求失败，输出提示信息并结束程序 */
if(client_fd < 0) {
printf("server accept failed\n");
exit(3);
}
/* 连接成功，打印客户端的网卡信息 */
printf("client port: %d ,", ntohs(client_addr.sin_port));
printf("client ip: %s\n",inet_ntoa(client_addr.sin_addr));
/* 进入循环，不断接收客户端发送的消息并回复 */
while(1) {
/* 输出等待接收数据的提示信息 */
printf("Waiting recv.....\n");
/* 读取客户端发送的数据，返回读取到的字节数 */
ret = read(client_fd, recvBuffer, 128);
/* 如果读取失败，输出提示信息 */
if(ret < 0)
printf("read failed\n");
/* 如果读取到的字节数为0，表示客户端已下线，关闭连接并跳出循环 */
else if(ret == 0) {
close(client_fd);
break;
}
/* 如果读取到了数据，打印接收到的消息，并回复客户端 */
else {
printf("client data: %s\n", recvBuffer);
write(client_fd, "Successfully received your message!", 128);
}
}