401caa1438
years. Not fixed: stale, misformatted copy of <dirent.h>. I will be cleaning up the dirent.h and dir.h headers soon (ufs stuff needs to be separated better), so don't change the man page yet.
168 lines
5.2 KiB
Groff
168 lines
5.2 KiB
Groff
.\" Copyright (c) 1983, 1991, 1993
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.\" The Regents of the University of California. All rights reserved.
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.\"
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.\" Redistribution and use in source and binary forms, with or without
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.\" modification, are permitted provided that the following conditions
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.\" are met:
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.\" 1. Redistributions of source code must retain the above copyright
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.\" notice, this list of conditions and the following disclaimer.
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.\" 2. Redistributions in binary form must reproduce the above copyright
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.\" notice, this list of conditions and the following disclaimer in the
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.\" documentation and/or other materials provided with the distribution.
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.\" 3. All advertising materials mentioning features or use of this software
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.\" must display the following acknowledgement:
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.\" This product includes software developed by the University of
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.\" California, Berkeley and its contributors.
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.\" 4. Neither the name of the University nor the names of its contributors
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.\" may be used to endorse or promote products derived from this software
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.\" without specific prior written permission.
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.\"
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.\" THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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.\" ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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.\" ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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.\" FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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.\" DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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.\" OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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.\" LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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.\" OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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.\" SUCH DAMAGE.
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.\"
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.\" @(#)dir.5 8.3 (Berkeley) 4/19/94
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.\" $Id: dir.5,v 1.7 1997/02/22 13:25:58 peter Exp $
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.\"
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.Dd April 19, 1994
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.Dt DIR 5
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.Os BSD 4.2
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.Sh NAME
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.Nm dir ,
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.Nm dirent
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.Nd directory file format
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.Sh SYNOPSIS
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.Fd #include <sys/types.h>
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.Fd #include <dirent.h>
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.Sh DESCRIPTION
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Directories provide a convenient hierarchical method of grouping
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files while obscuring the underlying details of the storage medium.
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A directory file is differentiated from a plain file
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by a flag in its
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.Xr inode 5
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entry.
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It consists of records (directory entries) each of which contains
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information about a file and a pointer to the file itself.
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Directory entries may contain other directories
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as well as plain files; such nested directories are referred to as
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subdirectories.
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A hierarchy of directories and files is formed in this manner
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and is called a file system (or referred to as a file system tree).
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.\" An entry in this tree,
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.\" nested or not nested,
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.\" is a pathname.
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.Pp
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Each directory file contains two special directory entries; one is a pointer
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to the directory itself
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called dot
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.Ql \&.
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and the other a pointer to its parent directory called dot-dot
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.Ql \&.. .
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Dot and dot-dot
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are valid pathnames, however,
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the system root directory
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.Ql / ,
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has no parent and dot-dot points to itself like dot.
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.Pp
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File system nodes are ordinary directory files on which has
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been grafted a file system object, such as a physical disk or a
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partitioned area of such a disk.
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(See
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.Xr mount 2
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and
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.Xr mount 8 . )
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.Pp
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The directory entry format is defined in the file
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.Aq dirent.h :
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.Bd -literal
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#ifndef _DIRENT_H_
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#define _DIRENT_H_
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/*
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* A directory entry has a struct dirent at the front of it, containing its
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* inode number, the length of the entry, and the length of the name
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* contained in the entry. These are followed by the name padded to a 4
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* byte boundary with null bytes. All names are guaranteed null terminated.
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* The maximum length of a name in a directory is MAXNAMLEN.
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*/
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struct dirent {
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u_long d_fileno; /* file number of entry */
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u_short d_reclen; /* length of this record */
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u_char d_type; /* file type, see below */
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u_char d_namlen; /* length of string in d_name */
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#ifdef _POSIX_SOURCE
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char d_name[255 + 1]; /* maximum name length */
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#else
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#define MAXNAMLEN 255
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char d_name[MAXNAMLEN + 1]; /* maximum name length */
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#endif
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};
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/*
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* File types
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*/
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#define DT_UNKNOWN 0
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#define DT_FIFO 1
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#define DT_CHR 2
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#define DT_DIR 4
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#define DT_BLK 6
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#define DT_REG 8
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#define DT_LKN 10
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#define DT_SOCK 12
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#define DT_WHT 14
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#ifdef _POSIX_SOURCE
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typedef void * DIR;
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#else
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#define d_ino d_fileno /* backward compatibility */
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/* definitions for library routines operating on directories. */
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#define DIRBLKSIZ 1024
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/* structure describing an open directory. */
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typedef struct _dirdesc {
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int dd_fd; /* file descriptor associated with directory */
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long dd_loc; /* offset in current buffer */
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long dd_size; /* amount of data returned by getdirentries */
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char *dd_buf; /* data buffer */
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int dd_len; /* size of data buffer */
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long dd_seek; /* magic cookie returned by getdirentries */
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long dd_rewind;/* magic cookie for rewinding */
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} DIR;
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#define dirfd(dirp) ((dirp)->dd_fd)
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#ifndef NULL
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#define NULL 0
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#endif
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#endif /* _POSIX_SOURCE */
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#ifndef KERNEL
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#include <sys/cdefs.h>
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#endif /* !KERNEL */
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#endif /* !_DIRENT_H_ */
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.Ed
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.Sh SEE ALSO
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.Xr fs 5 ,
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.Xr inode 5
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.Sh HISTORY
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A
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.Nm
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file format appeared in
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.At v7 .
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