FSTAT — Get file status ¶FSTAT is identical to STAT — Get file status, except that information about an 
already opened file is obtained.
The elements in VALUES are the same as described by STAT — Get file status.
This intrinsic is provided in both subroutine and function forms; however, only one form can be used in any given program unit.
GNU extension
Subroutine, function
| CALL FSTAT(UNIT, VALUES [, STATUS]) | 
| STATUS = FSTAT(UNIT, VALUES) | 
| UNIT | An open I/O unit number of type INTEGER. | 
| VALUES | The type shall be INTEGER(4), DIMENSION(13). | 
| STATUS | (Optional) status flag of type INTEGER(4). Returns 0 
on success and a system specific error code otherwise. | 
See STAT — Get file status for an example.
To stat a link: 
LSTAT — Get file status 
To stat a file: 
STAT — Get file status