1 files changed, 17 insertions, 2 deletions
diff --git a/example/fioc.h b/example/fioc.h
index c1d9cdf..ec1a39d 100644
--- a/example/fioc.h
+++ b/example/fioc.h
@@ -12,6 +12,21 @@
 #include <sys/ioctl.h>
 
 enum {
-	FIOC_GET_SIZE = _IOR('E', 0, size_t),
-	FIOC_SET_SIZE = _IOW('E', 1, size_t),
+	FIOC_GET_SIZE	= _IOR('E', 0, size_t),
+	FIOC_SET_SIZE	= _IOW('E', 1, size_t),
+
+	/*
+	 * The following two ioctls don't follow usual encoding rules
+	 * and transfer variable amount of data.
+	 */
+	FIOC_READ	= _IO('E', 2),
+	FIOC_WRITE	= _IO('E', 3),
+};
+
+struct fioc_rw_arg {
+	off_t		offset;
+	void		*buf;
+	size_t		size;
+	size_t		prev_size;	/* out param for previous total size */
+	size_t		new_size;	/* out param for new total size */
 };