From 545e830e04d5b857d32ca048923f379de6ee0589 Mon Sep 17 00:00:00 2001
From: Tobias Kaupat <code@niondir.de>
Date: Mon, 27 Nov 2017 18:28:08 +0100
Subject: [PATCH] Allow multiple calls to close

---
 serial_windows.go | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/serial_windows.go b/serial_windows.go
index 6ccaa86..01fc9a6 100644
--- a/serial_windows.go
+++ b/serial_windows.go
@@ -17,7 +17,7 @@ package serial
 
 */
 
-import "syscall"
+import ("syscall")
 
 type windowsPort struct {
 	handle syscall.Handle
@@ -58,6 +58,12 @@ func nativeGetPortsList() ([]string, error) {
 }
 
 func (port *windowsPort) Close() error {
+	defer func() {
+		port.handle = 0
+	}()
+	if port.handle == 0 {
+		return nil
+	}
 	return syscall.CloseHandle(port.handle)
 }