stat()在c中给出错误的目录大小 [英] stat() giving wrong directory size in c

问题描述

我需要找到文件或目录的大小，无论使用stat()在命令行中给出了什么.它适用于文件(相对路径和绝对路径)，但是当我提供目录时，它总是返回大小为512或1024.

I need to find the size of a file or a directory whatever given in the commandline using stat(). It works fine for the files (both relative and absolute paths) but when I give a directory, it always returns the size as 512 or 1024.

如果我在目录中打印文件，它将如下所示:

If I print the files in the directory it goes as follows :

 Name : .
 Name : ..
 Name : new
 Name : new.c

，但实际上仅存在new和new.c文件.为此，即使我在目录中放置了更多文件，大小也将返回512. 这是我的代码片段:

but only the new and new.c files are actually in there. For this, the size is returned as 512 even if I place more files in the directory. Here s my code fragment:

if (stat(request.data,&st)>=0){
        request.msgType = (short)0xfe21;
        printf("\n Size : %ld\n",st.st_size);
        sprintf(reply.data,"%ld",st.st_size);
        reply.dataLen = strlen(reply.data);
    }
    else{
        perror("\n Stat()");
    }
}

我在哪里出错了?

这是我的请求，回复结构:

here is my request, reply structure:

 struct message{
        unsigned short msgType;
        unsigned int offset;
        unsigned int serverDelay;
        unsigned int dataLen;
        char data[100];
    };
struct message request,reply;

我在unix os的gcc编译器中运行它.

I run it in gcc compiler in unix os.

推荐答案

stat()不会返回其中文件大小的总和. size字段表示目录条目占用了多少空间，它取决于一些因素.如果您想知道特定目录下所有文件占用了多少空间，则必须递归该树，将所有文件所占用的空间相加.这就是du之类的工具的工作方式.

stat() on a directory doesn't return the sum of the file sizes in it. The size field represents how much space it taken by the directory entry instead, and it varies depending on a few factors. If you want to know how much space is taken by all files below a specific directory, then you have to recurse down the tree, adding up the space taken by all files. This is how tools like du work.

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