dir(5) - NetBSD Manual Pages

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DIRENT(5)                 NetBSD Programmer's Manual                 DIRENT(5)

dirent - directory format
#include <sys/types.h> #include <sys/dirent.h>
Directories provide a convenient hierarchical method of grouping files while obscuring the underlying details of the storage medium. A directo- ry file is differentiated from a plain file by a flag in its inode(5) en- try. It consists of records (directory entries) each of which contains information about a file and a pointer to the file itself. Directory en- tries 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(8).) The directory entry format is defined in the file <sys/dirent.h>: /* * A directory entry has a struct dirent 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. */ struct dirent { u_int32_t d_fileno; /* file number of entry */ u_int16_t d_reclen; /* length of this record */ u_int8_t d_type; /* file type, see below */ u_int8_t d_namlen; /* length of string in d_name */ #define MAXNAMLEN 255 char d_name[MAXNAMLEN + 1]; /* name must be no longer than this */ }; /* * File types */ #define DT_UNKNOWN 0 #define DT_FIFO 1 #define DT_CHR 2 #define DT_DIR 4 #define DT_BLK 6 #define DT_REG 8 #define DT_LNK 10 #define DT_SOCK 12 #define DT_WHT 14
getdents(2), fs(5), inode(5)
A dir structure appeared in Version 7 AT&T UNIX. The dirent structure appeared in NetBSD 1.3. NetBSD 1.6.2 August 12, 2002 2
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