__off_t
int fseeko(FILE *, __off_t, int);
__off_t ftello(FILE *);
typedef __off_t fpos_t;
int ftruncate(int, __off_t);
__off_t lseek(int, __off_t, int);
void *mmap(void *, size_t, int, int, int, __off_t);
int truncate(const char *, __off_t);
typedef __off_t off_t;
typedef __off_t off_t;
typedef __off_t off_t;
typedef __off_t off_t;
typedef __off_t off_t;
typedef __off_t off_t; /* file offset */