Index: test.d
==================================================================
--- test.d
+++ test.d
@@ -2,10 +2,12 @@
 import std.array;
 import std.conv;
 import std.stdio;
 import std.string;
 import std.typecons;
+import core.stdc.signal;
+import core.stdc.stdlib;
 import dfl.all;
 
 class Map
 {
 	private char[][] data;
@@ -373,11 +375,21 @@
 		}
 		this.text = .text("Score: ", score, "  air[",m.water_proof-m.underwater,"]");
 		invalidate();
 	}
 }
+
+extern(C) {
+	void sigint(int) {
+		write("A");
+		stdout.flush();
+		exit(0);
+	}
+}
 
 void main(string[] args)
 {
+	signal(SIGINT, &sigint);
+
 	Form myForm = new MyForm(new Map(File(args[1])));
 	Application.run(myForm);
 }