Read Directory Entries ?

bodhankaryogesh · 04-02-2008, 06:06 AM

Hi,

I have read the directory entries.
readdir(3) is used for it.
Now, I am jumping to next record by just adding (dirent+d_reclen).
d_reclen is multiple of 8 bytes.

The Problem is "Some records are being skipped."
e.g.
dirent{
d_ino = 100884
d_off = 17100
d_reclen = 112
d_nnames = 1
dirname {
dn_reclen = 72
dn_namlen = 19
dn_name = tc-cbq-details.8.gz
}
}
dirent {
d_ino = 100873
d_off = 17128
d_reclen = 96
d_nnames = 1
dirname {
dn_reclen = 56
dn_namlen = 13
dn_name = auditctl.8.gz
}
}
dirent {
d_ino = 102032
d_off = 17152
d_reclen = 96
d_nnames = 1
vfm_dirname_t {
dn_reclen = 56
dn_namlen = 12
dn_name = MAKEDEV.8.gz
}
}

There is no connection between record's offset and my calculation(dirent+d_reclen). i.e. 17100 + 112 != 17128 Therefore some records(files) are being skipped.
I only know the directory ! From that I need to get hte records !

Does Directory has discontiguous allocation?
How do I can read it ?

Wim Sturkenboom · 04-03-2008, 12:28 AM

From man 3 readdir

Code:

         struct dirent {
             ino_t          d_ino;       /* inode number */
             off_t          d_off;       /* offset to the next dirent */
             unsigned short d_reclen;    /* length of this record */
             unsigned char  d_type;      /* type of file */
             char           d_name[256]; /* filename */
         };

This does not seem to match your dirent.

Further it might help if you post some code (and please use code tags).

By the way, there is a dedicated programming section where you might have more luck with this question. I will report your post so a moderator can move it.

Tinkster · 04-03-2008, 03:01 AM

Moved: This thread is more suitable in <PROGRAMMING> and has been moved accordingly to help your thread/question get the exposure it deserves.