--- /dev/null
+++ dyld/dyld-941.4/common/ClosureFileSystemNull.h
@@ -0,0 +1,56 @@
+/*
+ * Copyright (c) 2017 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 ClosureFileSystemNull_h
+#define ClosureFileSystemNull_h
+
+#include "ClosureFileSystem.h"
+
+#include <sys/stat.h>
+
+namespace dyld3 {
+namespace closure {
+
+#pragma clang diagnostic push
+#pragma clang diagnostic ignored "-Wnon-virtual-dtor"
+class __attribute__((visibility("hidden"))) FileSystemNull : public FileSystem {
+public:
+    FileSystemNull() : FileSystem() { }
+
+    bool getRealPath(const char possiblePath[MAXPATHLEN], char realPath[MAXPATHLEN]) const override;
+
+    bool loadFile(const char* path, LoadedFileInfo& info, char realerPath[MAXPATHLEN], void (^error)(const char* format, ...)) const override;
+
+    void unloadFile(const LoadedFileInfo& info) const override;
+
+    void unloadPartialFile(LoadedFileInfo& info, uint64_t keepStartOffset, uint64_t keepLength) const override;
+
+    bool fileExists(const char* path, uint64_t* inode=nullptr, uint64_t* mtime=nullptr,
+                    bool* issetuid=nullptr, bool* inodesMatchRuntime = nullptr) const override;
+};
+#pragma clang diagnostic pop
+
+} //  namespace closure
+} //  namespace dyld3
+
+#endif /* ClosureFileSystemNull_h */