Add support for dup()ing fake file descriptors to the simulator.
diff --git a/simulator/wrapsim/Util.h b/simulator/wrapsim/Util.h
new file mode 100644
index 0000000..e470802
--- /dev/null
+++ b/simulator/wrapsim/Util.h
@@ -0,0 +1,4 @@
+
+
+
+int wsAtomicAdd(int *var, int val);