Exit gracefully (run deferred statements in main()) on SIGINT.

src/main.go

···
 		} else {
 			log.Println("serve: ready")
 		}
-		select {}
+
+		interrupt := make(chan struct{})
+		OnInterrupt(func() { interrupt <- struct{}{} })
+		<-interrupt
+
+		log.Println("exiting gracefully")
 	}
 }

src/signal_other.go

···
 func OnReload(handler func()) {
 	// not implemented
 }
+
+func OnInterrupt(handler func()) {
+	// not implemented
+}

src/signal_posix.go

···
 		}
 	}()
 }
+
+func OnInterrupt(handler func()) {
+	sigint := make(chan os.Signal, 1)
+	signal.Notify(sigint, syscall.SIGINT)
+	go func() {
+		<-sigint
+		signal.Stop(sigint)
+		handler()
+	}()
+}