//sys	Fchown(fd int, uid int, gid int) (err error)
//sys	Fchownat(fd int, path string, uid int, gid int, flags int) (err error) = SYS___FCHOWNAT_A
//sys	FcntlInt(fd uintptr, cmd int, arg int) (retval int, err error) = SYS_FCNTL
//sys	Fdatasync(fd int) (err error) = SYS_FDATASYNC
//sys	fstat(fd int, stat *Stat_LE_t) (err error)
//sys	fstatat(dirfd int, path string, stat *Stat_LE_t, flags int) (err error) = SYS___FSTATAT_A