add winfsp-tests and ext/tlib

ext/tlib/injection.h

@@ -0,0 +1,30 @@
+/**
+ * @file tlib/injection.h
+ *
+ * @copyright 2014-2015 Bill Zissimopoulos
+ */
+
+/* NOTE: This header may usefully be included multiple times.
+ * The TLIB_INJECT() macro will be redefined based on whether
+ * TLIB_INJECTIONS_ENABLED is defined.
+ */
+
+#undef TLIB_INJECT
+#if defined(TLIB_INJECTIONS_ENABLED)
+#define TLIB_INJECT(name, stmt)         \
+    do\
+    {\
+        static void *injection = 0;\
+        if (0 == injection)\
+            injection = tlib_injection(name);\
+        if (tlib_injection_trace(injection))\
+            stmt;\
+    } while (0)
+#else
+#define TLIB_INJECT(name, stmt)         do {} while (0)
+#endif
+
+void *tlib_injection(const char *name);
+int tlib_injection_trace(void *injection);
+void tlib_injection_enable(const char *name, const char *sym, unsigned trigger);
+void tlib_injection_disable(const char *name, const char *sym);