handle ctrl-c

@@ -27,10 +27,10 @@ func main() {
         fmt.Println("going")
     }()
 
-    // Since our two goroutines are running asynchrously
-    // in separate goroutines now, execution immediatly
-    // falls through to here. This `Scanln` code requires
-    // that we press a key before the program exits.
+    // Our two goroutines are running asynchrously in
+    // separate goroutines now, so execution falls through
+    // to here. This `Scanln` code requires we press a key
+    // before the program exits.
     var input string
     fmt.Scanln(&input)
     fmt.Println("done")

@@ -1,12 +1,21 @@
 #!/bin/bash
 
+TRAPPING=0
+trap "{ echo finishing; TRAPPING=1; }" SIGINT
+
 while :
 do
   tools/build
-  if [ "$?" == "0" ]; then
+  RET=$?
+  if [ $RET -eq 0 ]; then
     echo "success"
   else
-    echo "error"
+    echo "error: $RET"
+  fi
+  if [ $TRAPPING -eq 0 ]; then
+    sleep 1
+  else
+    echo "done"
+    exit 0
   fi
-  sleep 1
 done