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File Formatsdir_ufs(4)


NAME

 dir_ufs, dir - format of ufs directories

SYNOPSIS

 
#include <sys/param.h>
 
#include <sys/types.h>
 
#include <sys/fs/ufs_fsdir.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, for example, 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 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 */
};

ATTRIBUTES

 

See attributes(5) for a description of the following attributes:

ATTRIBUTE TYPEATTRIBUTE VALUE
Interface StabilityUnstable

SEE ALSO

 

fs_ufs(4), attributes(5)


SunOS 5.9Go To TopLast Changed 3 Jul 1990

 
      
      
Copyright 2002 Sun Microsystems, Inc. All rights reserved. Use is subject to license terms.