+int _PDCLIB_fillbuffer( struct _PDCLIB_file_t * stream );
+
+/* A system call that repositions within a file. Returns new offset on success,
+ -1 / errno on error.
+*/
+_PDCLIB_int64_t _PDCLIB_seek( struct _PDCLIB_file_t * stream, _PDCLIB_int64_t offset, int whence );