The dirent.h header file contains constants, prototypes, and typedef definitions for POSIX directory access functions. It declares the following functions.
_OPEN_SYS_DIR_EXT
| __opendir2() | __readdir2() |
_POSIX_SOURCE
| closedir() | opendir() | readdir() | rewinddir() |
_XOPEN_SOURCE
| seekdir() | telldir() |
_XOPEN_SOURCE 500
| readdir_r() |
This header file can be used by C++ POSIX(OFF) functions.