информация об индексном дескрипторе файла (file inode information)
Примечание (Note)
For pseudofiles that are autogenerated by the kernel, the file
size (stat.st_size; statx.stx_size) reported by the kernel is not
accurate. For example, the value 0 is returned for many files
under the /proc directory, while various files under /sys report
a size of 4096 bytes, even though the file content is smaller.
For such files, one should simply try to read as many bytes as
possible (and append '\0' to the returned buffer if it is to be
interpreted as a string).
