/*设置节点*/
	struct node
	{
		struct node *next;
		char *data;
		struct node *prev;
	};

	/*
	初始化链表
	返回了一个data为字符newdata的头节点
	*/
	struct node *list_init(char *newdata)
	{
		//名义头节点
		struct node *head = malloc(sizeof(struct node));
		head->data = newdata;
		head->next = head;
		head->prev = head;
		return head;
	}

	//写入数据并创建新节点
	struct node *newnode(char *newdata)
	{
		struct node *new = malloc(sizeof(struct node));
		new->data = newdata;
		new->next = NULL;
		new->prev = NULL;
	}

	//将节点加入链表
	int addnode(struct node *new,struct node *tail)
	{
		new->prev = tail->prev;
		new->next = tail;
		tail->prev = new;
		new->prev->next = new;
	}

	struct node *list = list_init("1.mp3");
	char *path = "/mnt/udisk/MusicJF/";				
	DIR *dp = opendir(path);
	struct dirent *p;

	while(p = readdir(dp))										//遍历目录文件
	{
		if(p->d_type == DT_REG)
		{
			if(strstr(p->d_name,".mp3")) 						//判断是否为.mp3文件
			{
				struct node *new = newnode(p->d_name); 			//创建新节点
				addnode(new,list);								//插入新节点
			}				
		}
	}
	char buf[200];
	//头指针
	struct node *head = list->next;