1 files changed, 9 insertions, 1 deletions
diff --git a/magic_buddy/magic_buddy.h b/magic_buddy/magic_buddy.h
index 167397b..3b5e8d0 100644
--- a/magic_buddy/magic_buddy.h
+++ b/magic_buddy/magic_buddy.h
@@ -42,10 +42,18 @@ void *reallocate(void *old, size_t new_size, size_t old_size,
                  struct buddy *state);
 
 // Attempts to reserve a range [@start,@start+@size).
+//
 // Returns 1 if success, 0 otherwise.
+//
 // Whenever possible, we avoid writing anything into the reserved region.
+//
+// If the reservation succeeds, and @out_start (@out_size) is negative, it puts
+// the start (size) of the actually reserved region into *@out_start
+// (*@out_size). These can be passed into liberate(...) later to unreserve.
+//
 // O(1)
-int reserve(void *start, size_t size, struct buddy *state);
+int reserve(void *start, size_t size, void **out_start, size_t *out_size,
+            struct buddy *state);
 
 // Update @state to assume the memory pool has been copied to
 // [@new_base,@new_base+@new_size)