* device only, store the block size in *BLKSZ_OUT. (Hence,
* *BLKSZ_OUT will be left unchanged if FD is open on a regular
* file.) If FD refers to any other kind of object then report a
* device only, store the block size in *BLKSZ_OUT. (Hence,
* *BLKSZ_OUT will be left unchanged if FD is open on a regular
* file.) If FD refers to any other kind of object then report a