Linux中,要讀出一個資料夾中所有檔案資訊(名稱,權限,大小等)

In Linux , How to open a directory and read all files in this directory?
read all file's information (filename , permission , size ..etc)

#include <sys/types.h>
#include <sys/stat.h>
#include <dirent.h>


struct stat attr;
struct dirent *entry = NULL;


DIR *mydir = opendir( "/var/web/mount" );
stat ( "/var/web/mount" , &attr );
 while((entry = readdir(mydir))) /* If we get EOF, the expression is 0 and
                                                    * the loop stops. */
    {
       
      
        printf ("Filename = %s\n" ,entry->d_name );
        printf ("FileType = %d\n", entry->d_type);

        printf("Size: %d K\n", (unsigned)attr.st_size/1024 +1 );
        printf("Permissions: %o\n", (int)attr.st_mode & 07777);
        printf("Is directory? %d\n", attr.st_mode & ST_ISDIR);
    }






===============================================
struct--stat
----------------------------------------------------
struct stat {
    mode_t    st_mode;    // file type & mode(permissions)
    ino_t     st_ino;     // i-node number(serial number)
    dev_t     st_dev;     // device number(filesystem)
    dev_t     st_rdev;    // device number for specials files
    nlink_t   st_nlink;   // number of links
    uid_t     st_uid;     // user ID of owner
    gid_t     st_gid;     // group ID of owner
    off_t     st_size;    // size in bytes, for regular files
    time_t    st_atime;   // time of last access
    time_t    st_mtime;   // time of last modification
    time_t    st_ctime;   // time of last file status change
    long      st_blksize; // best I/O block size
    long      st_blocks; -// number of 512-byte blocks allocated
};

===============================================


配合struct dirent，定義如下：

struct dirent {
    ino_t d_ino;
    off_t d_off;
    unsigned short int d_reclen;
    unsigned char d_type;
    char d_name[256];
};

d_ino 此目錄進入點的inode
d_off 目錄文件開頭至此目錄進入點的位移
d_reclen d_name的長度，不包含NULL字符
d_type d_name所指的檔案類型
d_name 檔名
其中unsigned cahr d_type;可以來判斷是子目錄或是一般的檔案。