From 08005d711a6ff78d44667048a9239c808549c97e Mon Sep 17 00:00:00 2001
From: =?utf8?q?Jos=C3=A9=20Fonseca?= <jose.r.fonseca@gmail.com>
Date: Wed, 20 Apr 2011 21:05:16 +0100
Subject: [PATCH] Print an error message when not able to open X display.

---
 glws_glx.cpp | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/glws_glx.cpp b/glws_glx.cpp
index 661e77d..64f8ce1 100644
--- a/glws_glx.cpp
+++ b/glws_glx.cpp
@@ -23,6 +23,9 @@
  *
  **************************************************************************/
 
+#include <stdlib.h>
+#include <iostream>
+
 #include "glimports.hpp"
 #include "glws.hpp"
 
@@ -102,6 +105,10 @@ private:
 public:
     GlxWindowSystem() {
         display = XOpenDisplay(NULL);
+	if (!display) {
+            std::cerr << "error: unable to open display " << XDisplayName(NULL) << "\n";
+            exit(1);
+        }
         screen = DefaultScreen(display);
     }
 
-- 
2.7.4