__off_t
__off_t (*_seek) (void *, __off_t, int);
__off_t _offset; /* current lseek offset */
typedef __off_t off_t;
#define off_t __off_t
__off_t _pos;
typedef __off_t off_t; /* file offset */
#define off_t __off_t
typedef __off_t off_t; /* file offset */
#define off_t __off_t
typedef __off_t off_t; /* file offset */
#define off_t __off_t