Library /sys$common/syshlp/helplib.hlb  —  CRTL  readdir  Return Values
    x                  On successful completion of readdir, a pointer
                       to an object of type struct dirent.
    0                  Successful completion of readdir_r.
    x                  On error, an error value (readdir_r only).
    NULL               An error occurred or end of the directory
                       stream (readdir_r only). If an error occurred,
                       errno is set to a value indicating the cause.
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