From 091d6f558821db718702f1dd9636637d2c429d6f Mon Sep 17 00:00:00 2001
From: Thorsten von Eicken <tve@rightscale.com>
Date: Fri, 26 Aug 2016 23:02:41 -0700
Subject: [PATCH] gpio: don't fail if pin is already exported

---
 host/generic/digitalpin.go | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/host/generic/digitalpin.go b/host/generic/digitalpin.go
index 80a81ea..525eeb4 100644
--- a/host/generic/digitalpin.go
+++ b/host/generic/digitalpin.go
@@ -10,6 +10,7 @@ import (
 	"os"
 	"path"
 	"strconv"
+	"syscall"
 	"time"
 
 	"github.com/kidoman/embd"
@@ -69,6 +70,9 @@ func (p *digitalPin) export() error {
 	}
 	defer exporter.Close()
 	_, err = exporter.WriteString(strconv.Itoa(p.n))
+	if e, ok := err.(*os.PathError); ok && e.Err == syscall.EBUSY {
+		return nil // EBUSY -> the pin has already been exported
+	}
 	return err
 }