dll: fuse3: compatibility functions

src/dll/fuse3/fuse3_compat.c

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+/**
+ * @file dll/fuse/fuse3_compat.c
+ *
+ * @copyright 2015-2018 Bill Zissimopoulos
+ */
+/*
+ * This file is part of WinFsp.
+ *
+ * You can redistribute it and/or modify it under the terms of the GNU
+ * General Public License version 3 as published by the Free Software
+ * Foundation.
+ *
+ * Licensees holding a valid commercial license may use this file in
+ * accordance with the commercial license agreement provided with the
+ * software.
+ */
+
+#include <dll/library.h>
+
+/*
+ * This file provides an implementation of the `fuse3_*` symbols. This
+ * implementation is a simple shim that forwards `fuse3_*` calls to the
+ * equivalent `fsp_fuse3_*` ones using a default `fsp_fuse_env`.
+ *
+ * These symbols should *not* be used by C/C++ programs. For this reason
+ * the `fuse.h` headers only expose the `fsp_fuse3_*` symbols, wrapped
+ * with macros. These symbols are for use only from programs using FFI
+ * technology to access FUSE symbols (e.g. fusepy, jnr-fuse).
+ */
+
+#define FSP_FUSE_API
+#define FSP_FUSE_SYM(proto, ...)        __declspec(dllexport) proto { __VA_ARGS__ }
+#include <fuse3/fuse_common.h>
+#include <fuse3/fuse.h>