--- /dev/null
+++ Libc/Libc-1353.100.2/os/api.h
@@ -0,0 +1,109 @@
+/*
+ * 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@
+ */
+
+/*!
+ * @header
+ * API macros. libdarwin provides APIs for low-level userspace projects in the
+ * Darwin operating system.
+ *
+ * - C language additions
+ * - POSIX and BSD API additions
+ * - POSIX and BSD convenience wrappers
+ * - Mach API additions and wrappers with clearer semantics
+ *
+ * Additions which extend the C language are not prefixed and are therefore not
+ * included by default when including this header.
+ *
+ * Additions to API families conforming to ANSI C carry the "os_" prefix.
+ *
+ * Additions to API families conforming to POSIX carry the "_np" ("Not POSIX")
+ * suffix.
+ *
+ * Additions to API families conforming to both POSIX and ANSI C carry the "_np"
+ * suffix.
+ *
+ * Convenience wrappers for POSIX and BSD APIs carry the "os_" prefix.
+ *
+ * New APIs formalizing Darwin workflows carry the "os_" prefix.
+ */
+#ifndef __DARWIN_API_H
+#define __DARWIN_API_H
+
+#include <os/availability.h>
+#include <stdint.h>
+
+/*!
+ * @const DARWIN_API_VERSION
+ * The API version of the library. This version will be changed in accordance
+ * with new API introductions so that callers may submit code to the build that
+ * adopts those new APIs before the APIs land by using the following pattern:
+ *
+ * #if DARWIN_API_VERSION >= 20180424
+ * darwin_new_api();
+ * #endif
+ *
+ * In this example, the libdarwin maintainer and API adopter agree on an API
+ * version of 20180424 ahead of time for the introduction of
+ * darwin_new_api_call(). When a libdarwin with that API version is submitted,
+ * the project is rebuilt, and the new API becomes active.
+ *
+ * Breaking API changes will be both covered under this mechanism as well as
+ * individual preprocessor macros in this header that declare new behavior as
+ * required.
+ */
+#define DARWIN_API_VERSION 20191015u
+
+#if !DARWIN_BUILDING_LIBSYSTEM_DARWIN
+#define DARWIN_API_AVAILABLE_20170407 \
+		API_AVAILABLE(macos(10.14), ios(12.0), tvos(12.0), watchos(5.0))
+#define DARWIN_API_AVAILABLE_20180727 \
+		API_AVAILABLE(macos(10.15), ios(13.0), tvos(13.0), watchos(6.0))
+#define DARWIN_API_AVAILABLE_20181020 \
+		API_AVAILABLE(macos(10.15), ios(13.0), tvos(13.0), watchos(6.0))
+#define DARWIN_API_AVAILABLE_20181020 \
+		API_AVAILABLE(macos(10.15), ios(13.0), tvos(13.0), watchos(6.0))
+#define DARWIN_API_AVAILABLE_20190830 \
+		API_AVAILABLE(macos(10.15.2), ios(13.3), tvos(13.3), watchos(6.1.1))
+#define DARWIN_API_AVAILABLE_20191015 \
+		API_AVAILABLE(macos(10.15.2), ios(13.3), tvos(13.3), watchos(6.1.1))
+#else
+#define DARWIN_API_AVAILABLE_20170407
+#define DARWIN_API_AVAILABLE_20180727
+#define DARWIN_API_AVAILABLE_20181020
+#define DARWIN_API_AVAILABLE_20190830
+#define DARWIN_API_AVAILABLE_20191015
+#endif
+
+/*!
+ * @typedef os_struct_magic_t
+ * A type representing the magic number of a transparent structure.
+ */
+typedef uint32_t os_struct_magic_t;
+
+/*!
+ * @typedef os_struct_version_t
+ * A type representing the version of a transparent structure.
+ */
+typedef uint32_t os_struct_version_t;
+
+#endif // __DARWIN_API_H