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@ -1,64 +1,64 @@
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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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## getcwd
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|
|
|
|
|
|
|
|
|
##### 1)思路分析
|
|
|
|
|
|
|
|
|
|
###### 获取当前目录的节点号
|
|
|
|
|
|
|
|
|
|
current_ino = get_ino_byname(".")
|
|
|
|
|
|
|
|
|
|
###### 获取当前节点的父目录的节点号
|
|
|
|
|
|
|
|
|
|
parent_ino = get_ino_byname("..") namei函数
|
|
|
|
|
|
|
|
|
|
###### 判断是否在根目录; **循环**直至根目录 这里有个循环回溯的过程
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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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|
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###### 根据buf输出路径
|
|
|
|
|
|
|
|
|
|
##### 2)现有问题
|
|
|
|
|
|
|
|
|
|
没有实现如何搜索到对应文件名记录
|
|
|
|
|
|
|
|
|
|
路径名传入没实现
|
|
|
|
|
|
|
|
|
|
## sleep
|
|
|
|
|
|
|
|
|
|
###### 1)思路
|
|
|
|
|
|
|
|
|
|
在系统调用里分别调用
|
|
|
|
|
|
|
|
|
|
mysignal(SIGALRM,SIG_IGN);
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|
|
|
|
|
|
|
|
|
alram(1)
|
|
|
|
|
|
|
|
|
|
pasue()
|
|
|
|
|
|
|
|
|
|
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。
|
|
|
|
|
|
|
|
|
|
2)问题
|
|
|
|
|
|
|
|
|
|
系统调用函数实现后,发现测试报错
|
|
|
|
|
|
|
|
|
|
显示错误:
|
|
|
|
|
|
|
|
|
|
-----testing sleep:
|
|
|
|
|
|
|
|
|
|
malloc called with impossibly large argument(334988)
|
|
|
|
|
|
|
|
|
|
Kernel panic: malloc: bad arg
|
|
|
|
|
|
|
|
|
|
最后解决方法是将原来直接跳过的系统调用号给补上,
|
|
|
|
|
|
|
|
|
|
加了个89的系统调用函数pipe2()
|
|
|
|
|
|
|
|
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