-/* A system call that writes a stream's buffer.
- Returns 0 on success, EOF on write error.
- Sets stream error flags and errno appropriately on error.
-*/
-int _PDCLIB_flushbuffer( struct _PDCLIB_file_t * stream );
+#ifdef _PDCLIB_HAVE_REALLOCPAGES
+/* A system call which attempts to reallocate the group of \p on pages starting
+ at \p p, resizing the chunk to be \p nn pages long. If \p mayMove is true,
+ then then the group of pages may move; otherwise, if the group cannot be
+ resized in its current position, failure must be reported.