_Seek
off_t _Seek(off_t position, uint32 seekMode) const;
static off_t _Seek(void* cookie, off_t offset, int whence);
_Seek);
0, _Write, _Seek);
static off_t _Seek(void* cookie, off_t offset, int whence);
off_t position = _Seek(0, SEEK_END);
off_t size = _Seek(position, SEEK_SET);
off_t oldPosition = _Seek(position, SEEK_SET);
off_t oldPosition = _Seek(position, SEEK_SET);