readdir − read a directory
struct dirent *readdir(DIR *dir);
The readdir() function returns a pointer to a dirent structure representing the next directory entry in the directory stream pointed to by dir. It returns NULL on reaching the end-of-file or if an error occurred.
The data returned by readdir() is overwritten by subsequent calls to readdir() for the same directory stream.
According to POSIX, the dirent structure contains a field char d_name of unspecified size, with at most NAME_MAX characters preceding the terminating null character. Use of other fields will harm the portability of your programs.
The readdir() function returns a pointer to a dirent structure, or NULL if an error occurs or end-of-file is reached.
Invalid directory stream descriptor dir.
SVID 3, POSIX, BSD 4.3