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File Formats                                           dir_ufs(4)

     dir_ufs, dir - format of ufs directories

     #include <sys/param.h>

     #include <sys/types.h>

     #include <sys/fs/ufs_fsdir.h>

     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, for  exam-
     ple, 512 bytes on most machines.

     Each  DIRBLKSIZ-byte block contains some number of directory
     entry structures, which are of variable length.  Each direc-
     tory entry has a  struct direct at the front of it, contain-
     ing  its  inode  number,  the  length  of the entry, and the
     length of the name contained in the  entry.   These  entries
     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                        DEV_BSIZE
     #define MAXNAMLEN                        256
     struct direct {
             ulong_t  d_ino;                  /* inode number of entry */
             ushort_t d_reclen;               /* length of this record */
             ushort_t d_namlen;               /* length of string in d_name */
             char     d_name[MAXNAMLEN + 1];  /* maximum name length */

     See attributes(5) for a description of the following  attri-

    |       ATTRIBUTE TYPE        |       ATTRIBUTE VALUE       |
    | Interface Stability         | Unstable                    |

     attributes(5), ufs(7FS),

SunOS 5.9          Last change: 16 April 2003                   1