информация об индексном дескрипторе файла (file inode information)
Стандарты (Conforming to)
If you need to obtain the definition of the blkcnt_t or blksize_t
types from <sys/stat.h>, then define _XOPEN_SOURCE with the value
500 or greater (before including any header files).
POSIX.1-1990 did not describe the S_IFMT, S_IFSOCK, S_IFLNK,
S_IFREG, S_IFBLK, S_IFDIR, S_IFCHR, S_IFIFO, and S_ISVTX
constants, but instead specified the use of the macros S_ISDIR()
and so on. The S_IF* constants are present in POSIX.1-2001 and
later.
The S_ISLNK() and S_ISSOCK() macros were not in POSIX.1-1996, but
both are present in POSIX.1-2001; the former is from SVID 4, the
latter from SUSv2.
UNIX V7 (and later systems) had S_IREAD, S_IWRITE, S_IEXEC, and
where POSIX prescribes the synonyms S_IRUSR, S_IWUSR, and
S_IXUSR.
