DragonFly On-Line Manual Pages


DIR(5)			 DragonFly File Formats Manual			DIR(5)

NAME

dir, dirent -- directory file format

SYNOPSIS

#include <dirent.h>

DESCRIPTION

Directories provide a convenient hierarchical method of grouping files while obscuring the underlying details of the storage medium. A direc- tory file is differentiated from a plain file by a flag in its inode(5) entry. It consists of records (directory entries) each of which contains information about a file and a pointer to the file itself. Directory entries may contain other directories as well as plain files; such nested directories are referred to as subdirectories. A hierarchy of directo- ries and files is formed in this manner and is called a file system (or referred to as a file system tree). Each directory file contains two special directory entries; one is a pointer to the directory itself called dot `.' and the other a pointer to its parent directory called dot-dot `..'. Dot and dot-dot are valid pathnames, however, the system root directory `/', has no parent and dot- dot points to itself like dot. File system nodes are ordinary directory files on which has been grafted a file system object, such as a physical disk or a partitioned area of such a disk. (See mount(2) and mount(8).) The directory entry format is defined in <sys/dirent.h>. This file should not be included directly by applications.

SEE ALSO

fs(5), inode(5)

HISTORY

A dir file format appeared in Version 7 AT&T UNIX.

BUGS

The usage of the member d_type of struct dirent is unportable as it is DragonFly/FreeBSD-specific. It also may fail on certain filesystems, for example the cd9660 filesystem. DragonFly 4.1 March 5, 2005 DragonFly 4.1