dir(4)                        UNIX System V(UFS)                         dir(4)


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
      ufs-specific fs(4)






















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