diff --git a/runtime/halt/callbacks.go b/runtime/halt/callbacks.go
new file mode 100644
index 0000000..261c05e
--- /dev/null
+++ b/runtime/halt/callbacks.go
@@ -0,0 +1,22 @@
+package halt
+
+import (
+	"os"
+	"os/signal"
+)
+
+type Callback func(sig os.Signal)
+
+func On(f Callback, sigs ...os.Signal) {
+	c := make(chan os.Signal, 1)
+	for _, sig := range sigs {
+		signal.Notify(c, sig)
+	}
+	go watch(f, c)
+}
+
+func watch(f Callback, c <-chan os.Signal) {
+	for sig := range c {
+		f(sig)
+	}
+}