From 5f8a0fced0d2b266f9d12fb253f066374fc115ef Mon Sep 17 00:00:00 2001
From: SjB <steve@sagacity.ca>
Date: Wed, 9 Apr 2014 00:38:19 -0400
Subject: [PATCH] Stop Watching pin when Closing

Closing a pin will automatically check and close any pin that where being
watch for interrupt.
---
 gpiodriver.go              | 6 ++++++
 host/generic/digitalpin.go | 4 ++++
 2 files changed, 10 insertions(+)

diff --git a/gpiodriver.go b/gpiodriver.go
index 69d0516..d2f4808 100644
--- a/gpiodriver.go
+++ b/gpiodriver.go
@@ -100,6 +100,12 @@ func (io *gpioDriver) RegisterInterrupt(p InterruptPin) error {
 func (io *gpioDriver) UnregisterInterrupt(p InterruptPin) error {
 
 	fd := p.Fd()
+
+	// check if we are watching this pin
+	if _, ok := io.watchEventCallbacks[fd]; !ok {
+		return nil
+	}
+
 	if err := syscall.EpollCtl(epollFD, syscall.EPOLL_CTL_DEL, fd, nil); err != nil {
 		return err
 	}
diff --git a/host/generic/digitalpin.go b/host/generic/digitalpin.go
index 1a50d5c..955e30f 100644
--- a/host/generic/digitalpin.go
+++ b/host/generic/digitalpin.go
@@ -276,6 +276,10 @@ func (p *digitalPin) Close() error {
 		return err
 	}
 
+	if err := p.StopWatching(); err != nil {
+		return err
+	}
+
 	if !p.initialized {
 		return nil
 	}