--- /dev/null
+++ Libc/Libc-1507.100.9/darwin/_libc_init.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (c) 2020 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 __LIBC_INIT_H__
+#define __LIBC_INIT_H__
+
+#include <sys/cdefs.h>
+#include <AvailabilityMacros.h>
+
+// This header file contains declarations intended only for use by the
+// libSystem.dylib and other members of the libSystem umbrella. These
+// interfaces are an unstable ABI and should not be used by any projects
+// other than the intended clients.
+
+__BEGIN_DECLS
+
+struct _libc_functions {
+	unsigned long version;
+	void (*atfork_prepare)(void); // version 1
+	void (*atfork_parent)(void); // version 1
+	void (*atfork_child)(void); // version 1
+	char *(*dirhelper)(int, char *, size_t); // version 1
+	void (*atfork_prepare_v2)(unsigned int flags, ...); // version 2
+	void (*atfork_parent_v2)(unsigned int flags, ...); // version 2
+	void (*atfork_child_v2)(unsigned int flags, ...); // version 2
+};
+
+#define LIBSYSTEM_ATFORK_HANDLERS_ONLY_FLAG 1
+
+struct ProgramVars; // forward reference
+
+__deprecated_msg("use _libc_initializer()")
+extern void
+__libc_init(const struct ProgramVars *vars,
+	void (*atfork_prepare)(void),
+	void (*atfork_parent)(void),
+	void (*atfork_child)(void),
+	const char *apple[]);
+
+__OSX_AVAILABLE_STARTING(__MAC_10_10, __IPHONE_8_0)
+extern void
+_libc_initializer(const struct _libc_functions *funcs,
+	const char *envp[],
+	const char *apple[],
+	const struct ProgramVars *vars);
+
+extern void
+_libc_fork_child(void);
+
+__END_DECLS
+
+#endif // __LIBC_INIT_H__