the order of readdir

readdir(3)返回的文件顺序，与struct dirent中d_off的值相关，和inode号的大小没有关系。

 

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

int main()
{
        DIR *dirp;
        struct dirent *dp;

        dirp = opendir(".");
        while (dp = readdir(dirp)) {
                printf("%s: \toff=%011d\n", dp->d_name, dp->d_off);
        }

        return 0;
}

// struct dirent
// {
// long d_ino; /* inode number */
// off_t d_off; /* offset to this dirent */
// unsigned short d_reclen; /* length of this d_name */
// char d_name [NAME_MAX+1]; /* filename (null-terminated) */
// }


/*
  # ./readdir
  file2: off=00581882856
  .:     off=01047962852
  file3: off=01376021557
  dir2:  off=01431881775
  dir1:  off=01558077073
  file1: off=01576748262
  ..:    off=02147483647
 */