--- /dev/null
+++ libmalloc/libmalloc-646.40.3/src/purgeable_malloc.h
@@ -0,0 +1,32 @@
+/*
+ * Copyright (c) 2015 Apple Inc. All rights reserved.
+ *
+ * @APPLE_LICENSE_HEADER_START@
+ *
+ * This file contains Original Code and/or Modifications of Original Code
+ * as defined in and that are subject to the Apple Public Source License
+ * Version 2.0 (the 'License'). You may not use this file except in
+ * compliance with the License. Please obtain a copy of the License at
+ * http://www.opensource.apple.com/apsl/ and read it before using this
+ * file.
+ *
+ * The Original Code and all software distributed under the License are
+ * distributed on an 'AS IS' basis, WITHOUT WARRANTY OF ANY KIND, EITHER
+ * EXPRESS OR IMPLIED, AND APPLE HEREBY DISCLAIMS ALL SUCH WARRANTIES,
+ * INCLUDING WITHOUT LIMITATION, ANY WARRANTIES OF MERCHANTABILITY,
+ * FITNESS FOR A PARTICULAR PURPOSE, QUIET ENJOYMENT OR NON-INFRINGEMENT.
+ * Please see the License for the specific language governing rights and
+ * limitations under the License.
+ *
+ * @APPLE_LICENSE_HEADER_END@
+ */
+
+#ifndef __PURGEABLE_MALLOC_H
+#define __PURGEABLE_MALLOC_H
+
+/* Create a new zone that supports malloc_make{un}purgeable() discipline. */
+MALLOC_NOEXPORT
+malloc_zone_t *
+create_purgeable_zone(size_t initial_size, malloc_zone_t *malloc_default_zone, unsigned debug_flags);
+
+#endif // __PURGEABLE_MALLOC_H