TCP Server端实现

C/S模型

Server 端功能分析

/**
  * @brief  TCP 服务器任务
  * @param  None
  * @retval None
  */
void vTcpServerTask(void){

	int 	 sfd, cfd, n, i;
	struct sockaddr_in server_addr, client_addr;
	socklen_t	client_addr_len;
	
	//创建socket
	sfd = socket(AF_INET, SOCK_STREAM, 0);
	server_addr.sin_family 			= AF_INET;
	server_addr.sin_port   			= htons(SERVER_PORT);
	server_addr.sin_addr.s_addr = htonl(INADDR_ANY);
	//绑定socket
	bind(sfd, (struct sockaddr *)&server_addr, sizeof(server_addr));
	//监听socket
	listen(sfd, 5);
	//等待客户端连接
	client_addr_len = sizeof(client_addr);
	cfd = accept(sfd, (struct sockaddr *)&client_addr, &client_addr_len);
	printf("client is connect cfd = %d\r\n",cfd);
	while(1){
		//等待客户端发送数据
		n = read(cfd, ReadBuff, BUFF_SIZE);
		//进行大小写转换
		for(i = 0; i < n; i++){
		
			ReadBuff[i] = toupper(ReadBuff[i]);		
		}
		//写回客户端
		write(cfd, ReadBuff, n);
	}
}