expose st_blksize field from fstat syscall
The libc manual talks about buffer sizes.
They advise: Actually, you can get an even better value to use for the buffer size by means of the fstat system call: it is found in the st_blksize field of the file attributes. See Attribute Meanings.
It's just that the st_blksize field it stepped over in the haskell definition of it:
Which goes directly from filesize to accesstime
See also https://linux.die.net/man/2/fstat
Would be nice to expose the additional fields as well