dir(4-ufs)                                                       dir(4-ufs)

NAME
     dir (ufs) - format of ufs directories

SYNOPSIS
     #include <sys/param.h>
     #include <sys/types.h>
     #include <sys/fs/ufsfsdir.h>

DESCRIPTION
     A directory consists of some number of blocks of DIRBLKSIZ bytes,
     where DIRBLKSIZ is chosen such that it can be transferred to disk in a
     single atomic operation (e.g. 512 bytes on most machines).

     Each DIRBLKSIZ-byte block contains some number of directory entry
     structures, which are of variable length. Each directory entry has a
     struct direct at the front of it, containing its inode number, the
     length of the entry, and the length of the name contained in the
     entry. These are followed by the name padded to a 4-byte boundary with
     null bytes. All names are guaranteed null-terminated. The maximum
     length of a name in a directory is MAXNAMLEN.

          #define DIRBLKSIZ DEVBSIZE
          #define MAXNAMLEN 256
          struct direct
          {
              ulong  dino;                  /* inode number of entry */
              ushort dreclen;               /* length of this record */
              ushort dnamlen;               /* length of string in dname */
              char    dname[MAXNAMLEN + 1];  /* name must be no longer than this */
          };

SEE ALSO
     fs(4-ufs).






















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