* ext/fiddle/*: Adding fiddle library to wrap libffi

* test/fiddle/*: testing fiddle extension
* ext/dl/lib/dl.rb: Requiring fiddle if it is available
* ext/dl/lib/dl/callback.rb: using Fiddle if it is available
* ext/dl/lib/dl/func.rb: ditto

git-svn-id: svn+ssh://ci.ruby-lang.org/ruby/trunk@27640 b2dd03c8-39d4-4d8f-98ff-823fe69b080e

ext/fiddle/fiddle.h

@@ -0,0 +1,45 @@
+#ifndef FIDDLE_H
+#define FIDDLE_H
+
+#include <ruby.h>
+#include <errno.h>
+
+#if defined(HAVE_WINDOWS_H)
+#include <windows.h>
+#endif
+
+#ifdef HAVE_SYS_MMAN_H
+#include <sys/mman.h>
+#endif
+
+#ifdef USE_HEADER_HACKS
+#include <ffi/ffi.h>
+#else
+#include <ffi.h>
+#endif
+
+#include <closure.h>
+#include <conversions.h>
+#include <function.h>
+
+/* FIXME
+ * These constants need to match up with DL. We need to refactor this to use
+ * the DL header files or vice versa.
+ */
+
+#define TYPE_VOID  0
+#define TYPE_VOIDP 1
+#define TYPE_CHAR  2
+#define TYPE_SHORT 3
+#define TYPE_INT   4
+#define TYPE_LONG  5
+#if HAVE_LONG_LONG
+#define TYPE_LONG_LONG 6
+#endif
+#define TYPE_FLOAT 7
+#define TYPE_DOUBLE 8
+
+extern VALUE mFiddle;
+
+#endif
+/* vim: set noet sws=4 sw=4: */