From 5b1a0461f5fc83f463b610cd4cb0acd7fddcbe92 Mon Sep 17 00:00:00 2001
From: markusbloch <markusbloch@2b470e98-0d58-463d-a4d8-8e2adae1ed80>
Date: Sun, 18 Aug 2013 11:54:05 +0000
Subject: [PATCH] PRESENCE: recognize execution failure of ping-check

git-svn-id: svn://svn.code.sf.net/p/fhem/code/trunk@3736 2b470e98-0d58-463d-a4d8-8e2adae1ed80
---
 fhem/FHEM/73_PRESENCE.pm | 16 ++++++++++++----
 1 file changed, 12 insertions(+), 4 deletions(-)

diff --git a/fhem/FHEM/73_PRESENCE.pm b/fhem/FHEM/73_PRESENCE.pm
index e441e0a4e..0163a3f54 100755
--- a/fhem/FHEM/73_PRESENCE.pm
+++ b/fhem/FHEM/73_PRESENCE.pm
@@ -533,10 +533,18 @@ PRESENCE_DoLocalPingScan($)
     }
     else
     {
-	$temp = qx(ping -c $count $device);
-	
-	Log3 $name, 5, "PRESENCE ($name) - ping command returned with output:\n$temp";
-	$return = "$name|$local|".($temp =~ /\d+ [Bb]ytes (from|von)/ ? "present" : "absent");
+		$temp = qx(ping -c $count $device);
+		
+		chomp $temp;
+		if($temp ne "")
+		{
+			Log3 $name, 5, "PRESENCE ($name) - ping command returned with output:\n$temp";
+			$return = "$name|$local|".($temp =~ /\d+ [Bb]ytes (from|von)/ ? "present" : "absent");
+		}
+		else
+		{	
+			$return = "$name|$local|error|Could not execute ping command: \"ping -c $count $device\"";
+		}
     }
 
     return $return;