03-10-2014
A directory is a file that contains several entries where each entry is an inode number and a name. Is is possible that a directory will get to be 50 MB but that would be a lot of entries. You probably mean the sum of the sizes of all the files and subdirectories in a directory. That is a different concept and has little to do with the size of the directory itself.
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dirent(5) File Formats Manual dirent(5)
NAME
dirent.h - format of directory streams and directory entries
SYNOPSIS
DESCRIPTION
This header file defines data types used by the directory stream routines described in directory(3C).
The following data types are defined:
A structure containing information about an open directory stream.
A structure defining the format of entries returned
by the function (see directory(3C)).
The structure includes the following members:
char d_name[MAXNAMLEN+1]; /* name of directory entry */
ino_t d_ino; /* file serial number */
short d_namlen; /* length of string in d_name */
short d_reclen; /* length of this record */
The constant is defined in
Note that the entry is used internally to represent the offset from the current entry to the next valid entry. Therefore, is not the
length of the current entry, but the length of the current record where a record is an entry plus any currently unused space between the
current entry and the next valid entry. The unused space between valid entries results from changes in a directory's contents, such as the
deletion of files and other directories.
This file also contains external declarations for the functions that perform directory operations (see directory(3C)).
WARNINGS
For 32-bit applications, the d_ino field may overflow for filesystems that use 64-bit values. In this case, the most-significant bytes
will be truncated without error, and the value may not be unique.
AUTHOR
was developed by AT&T and HP.
SEE ALSO
directory(3C).
STANDARDS CONFORMANCE
dirent(5)