From 837a12c84151968fac6477f75d6bcb52e7ae64db Mon Sep 17 00:00:00 2001
From: "Jason A. Donenfeld" <Jason@zx2c4.com>
Date: Mon, 21 May 2018 14:16:46 +0200
Subject: [PATCH] Close events channel when no status listener

---
 tun_darwin.go |  3 +++
 tun_linux.go  | 10 +++++++---
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/tun_darwin.go b/tun_darwin.go
index d2cdcd5..b8afdfd 100644
--- a/tun_darwin.go
+++ b/tun_darwin.go
@@ -303,6 +303,9 @@ func (tun *NativeTun) Close() error {
 		// Surprisingly, on Darwin, simply closing a route socket is enough to unblock it.
 		// We don't even need to call shutdown, or use a rwcancel.
 		err3 = unix.Close(tun.routeSocket)
+		tun.routeSocket = -1
+	} else if tun.events != nil {
+		close(tun.events)
 	}
 	if err1 != nil {
 		return err1
diff --git a/tun_linux.go b/tun_linux.go
index f5b24dc..629a5ec 100644
--- a/tun_linux.go
+++ b/tun_linux.go
@@ -357,9 +357,13 @@ func (tun *NativeTun) Events() chan TUNEvent {
 
 func (tun *NativeTun) Close() error {
 	var err1 error
-	close(tun.statusListenersShutdown)
-	if tun.netlinkCancel != nil {
-		err1 = tun.netlinkCancel.Cancel()
+	if tun.statusListenersShutdown != nil {
+		close(tun.statusListenersShutdown)
+		if tun.netlinkCancel != nil {
+			err1 = tun.netlinkCancel.Cancel()
+		}
+	} else if tun.events != nil {
+		close(tun.events)
 	}
 	err2 := tun.fd.Close()
 	err3 := tun.fdCancel.Cancel()