DIRENT(3) | Library Functions Manual | DIRENT(3) |
dirent
—
#include <sys/types.h>
#include <sys/dirent.h>
mode
DTTOIF
(dirtype);
dirtype
IFTODT
(mode);
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).)
<sys/dirent.h>
, which is also
included by <dirent.h>
. The
format is represented by the dirent structure, which
contains the following entries:
ino_t d_fileno; uint16_t d_reclen; uint16_t d_namlen; uint8_t d_type; char d_name[MAXNAMLEN + 1];
These are:
<sys/types.h>
.MAXNAMLEN
+ 1.The following table lists the types available for d_type and the corresponding ones used in the struct stat (see stat(2)), respectively:
Dirent | Stat | Description |
DT_UNKNOWN |
- | unknown file type |
DT_FIFO |
S_IFIFO |
named pipe |
DT_CHR |
S_IFCHR |
character device |
DT_DIR |
S_IFDIR |
directory |
DT_BLK |
S_IFBLK |
block device |
DT_REG |
S_IFREG |
regular file |
DT_LNK |
S_IFLNK |
symbolic link |
DT_SOCK |
S_IFSOCK |
UNIX domain socket |
DT_WHT |
S_IFWHT |
dummy “whiteout inode” |
The DT_WHT
type is internal to the
implementation and should not be seen in normal user applications. The
macros DTTOIF
() and IFTODT
()
can be used to convert from struct dirent types to
struct stat types, and vice versa.
Furthermore, the standard leaves the size of
d_name as unspecified, mentioning only that the number
of bytes preceding the terminating NUL shall not exceed
NAME_MAX
. Because of this, and because the
d_namlen field may not be present, a portable
application should determine the size of d_name by
using strlen(3) instead of
applying the sizeof
() operator.
May 16, 2010 | NetBSD 9.0 |