данные, возвращаемые функцией stat (data returned by the stat() function)
Будущие направления (Future directions)
No new S_IFMT symbolic names for the file type values of mode_t
will be defined by POSIX.1‐2008; if new file types are required,
they will only be testable through S_ISxx() or S_TYPEISxxx()
macros instead.