From f62e7d9e015e8046b302e06e4754132c8104c990 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Simon=20St=C3=BCrz?= <stuerz.simon@gmail.com>
Date: Wed, 29 Oct 2014 13:37:50 +0100
Subject: [PATCH] fixed gpio warnings (errors on trusty and utopic)

---
 libguh/hardware/gpio.cpp | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/libguh/hardware/gpio.cpp b/libguh/hardware/gpio.cpp
index 7517ef4c..41846b5f 100644
--- a/libguh/hardware/gpio.cpp
+++ b/libguh/hardware/gpio.cpp
@@ -61,9 +61,9 @@ bool Gpio::exportGpio()
         return false;
     }
 
-    size_t len = snprintf(buf, sizeof(buf), "%d", m_gpio);
+    uint len = snprintf(buf, sizeof(buf), "%d", m_gpio);
     if(write(fd, buf, len) != len){
-        qDebug() << "ERROR: could not write to gpio";
+        qDebug() << "ERROR: could not set edge interrupt";
         close(fd);
         return false;
     }
@@ -81,9 +81,10 @@ bool Gpio::unexportGpio()
         //qDebug() << "ERROR: could not open /sys/class/gpio/unexport";
         return false;
     }
-    size_t len = snprintf(buf, sizeof(buf), "%d", m_gpio);
+
+    uint len = snprintf(buf, sizeof(buf), "%d", m_gpio);
     if(write(fd, buf, len) != len){
-        qDebug() << "ERROR: could not write to gpio";
+        qDebug() << "ERROR: could not set edge interrupt";
         close(fd);
         return false;
     }
@@ -235,7 +236,11 @@ int Gpio::getValue()
     }
     char ch;
     int value = -1;
-    read(fd, &ch, 1);
+    ssize_t len = read(fd, &ch, 1);
+    if(len != 1){
+        close(fd);
+        return -1;
+    }
 
     if (ch != '0') {
         value = 1;