--- /dev/null
+++ libmalloc/libmalloc-409.60.6/src/malloc_common.h
@@ -0,0 +1,74 @@
+/*
+ * Copyright (c) 2018 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 __MALLOC_COMMON_H
+#define __MALLOC_COMMON_H
+
+MALLOC_NOEXPORT
+const char *
+malloc_common_strstr(const char *src, const char *target, size_t target_len);
+
+MALLOC_NOEXPORT
+long
+malloc_common_convert_to_long(const char *ptr, const char **end_ptr);
+
+MALLOC_NOEXPORT
+const char *
+malloc_common_value_for_key(const char *src, const char *key);
+
+MALLOC_NOEXPORT
+const char *
+malloc_common_value_for_key_copy(const char *src, const char *key,
+		 char *bufp, size_t maxlen);
+
+__options_decl(malloc_zone_options_t, unsigned, {
+	MZ_NONE  = 0x0,
+	MZ_POSIX = 0x1,
+	MZ_C11   = 0x2,
+});
+
+static MALLOC_INLINE void
+malloc_set_errno_fast(malloc_zone_options_t mzo, int err)
+{
+	if (mzo & MZ_POSIX) {
+#if TARGET_OS_SIMULATOR
+		errno = err;
+#else
+		(*_pthread_errno_address_direct()) = err;
+#endif
+	}
+}
+
+MALLOC_NOEXPORT
+void
+find_zone_and_free(void *ptr, bool known_non_default);
+
+typedef enum {
+	MALLOC_ZERO_ON_FREE = 0, // this is the 0 case so most checks can be 0-tests
+	MALLOC_ZERO_NONE = 1,
+	MALLOC_ZERO_ON_ALLOC = 2,
+} malloc_zero_policy_t;
+
+MALLOC_NOEXPORT
+extern malloc_zero_policy_t malloc_zero_policy;
+
+#endif // __MALLOC_COMMON_H