dll: fuse: add fuse_* symbols for programs using FFI

build/VStudio/winfsp_dll.vcxproj

@@ -34,6 +34,7 @@
     <ClCompile Include="..\..\src\dll\dirbuf.c" />
     <ClCompile Include="..\..\src\dll\eventlog.c" />
     <ClCompile Include="..\..\src\dll\fuse\fuse.c" />
+    <ClCompile Include="..\..\src\dll\fuse\fuse_compat.c" />
     <ClCompile Include="..\..\src\dll\fuse\fuse_intf.c" />
     <ClCompile Include="..\..\src\dll\fuse\fuse_main.c" />
     <ClCompile Include="..\..\src\dll\fuse\fuse_opt.c" />

build/VStudio/winfsp_dll.vcxproj.filters

@@ -106,6 +106,9 @@
     <ClCompile Include="..\..\src\dll\dirbuf.c">
       <Filter>Source</Filter>
     </ClCompile>
+    <ClCompile Include="..\..\src\dll\fuse\fuse_compat.c">
+      <Filter>Source\fuse</Filter>
+    </ClCompile>
   </ItemGroup>
   <ItemGroup>
     <None Include="..\..\src\dll\library.def">

src/dll/fuse/fuse_compat.c

@@ -0,0 +1,35 @@
+/**
+ * @file dll/fuse/fuse_compat.c
+ *
+ * @copyright 2015-2017 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 `fuse_*` symbols. This
+ * implementation is a simple shim that forwards `fuse_*` calls to the
+ * equivalent `fsp_fuse_*` 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_fuse_*` 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 <fuse/fuse_common.h>
+#include <fuse/fuse.h>
+#include <fuse/fuse_opt.h>