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## getcwd
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##### 1)思路分析
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###### 获取当前目录的节点号
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current_ino = get_ino_byname(".")
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###### 获取当前节点的父目录的节点号
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parent_ino = get_ino_byname("..") namei函数
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###### 判断是否在根目录; **循环**直至根目录
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if(current_ino == parent_ino)break;
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###### 切换到父目录，根据current_ino,搜索到对应的文件名并记录
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chdir("..")
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buf[depth] = find_name_byino(current_ino) //buf这可能会出问题
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depth += len(find_name_byino(current_ino))
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等break出来
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###### 根据buf输出路径
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##### 2）现有问题
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没有实现如何搜索到对应文件名记录
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路径名传入没实现
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## sleep
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###### 1）思路
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在系统调用里分别调用
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mysignal(SIGALRM,SIG_IGN);
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alram(1)
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pasue()
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的系统调用函数，通过改变alarm中的参数，实现想睡多久就睡多久。
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2）问题
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系统调用函数实现后，发现测试报错
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显示错误：
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-----testing sleep:
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malloc called with impossibly large argument(334988)
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Kernel panic: malloc: bad arg
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最后解决方法是将原来直接跳过的系统调用号给补上，
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加了个89的系统调用函数pipe2()
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