From 04f775d77d53bca92faee883258d787b89255ef8 Mon Sep 17 00:00:00 2001
From: "Owen W. Taylor" <otaylor@fishsoup.net>
Date: Fri, 20 Nov 2009 10:42:07 -0500
Subject: [PATCH] Handle XError and XIOError for unknown displays

The atk-bridge GTK+ module opens its own display; if we get an
XIOError on that display, we shouldn't abort with a meta_bug()
but just exit normally. Also fix a segfault if we got an XError
for that display.
---
 src/core/errors.c |   13 +++++--------
 1 files changed, 5 insertions(+), 8 deletions(-)

diff --git a/src/core/errors.c b/src/core/errors.c
index 8de4608..59f9c71 100644
--- a/src/core/errors.c
+++ b/src/core/errors.c
@@ -222,10 +222,10 @@ x_error_handler (Display     *xdisplay,
 
   display = meta_display_for_x_display (xdisplay);
 
-  /* Display can be NULL here because the compositing manager
-   * has its own Display, but Xlib only has one global error handler
+  /* Display can be NULL here Xlib only has one global error handler; and
+   * there might be other displays open in the process.
    */
-  if (display->error_traps > 0)
+  if (display && display->error_traps > 0)
     {
       /* we're in an error trap, chain to the trap handler
        * saved from GDK
@@ -264,21 +264,18 @@ x_io_error_handler (Display *xdisplay)
 
   display = meta_display_for_x_display (xdisplay);
 
-  if (display == NULL)
-    meta_bug ("IO error received for unknown display?\n");
-  
   if (errno == EPIPE)
     {
       meta_warning (_("Lost connection to the display '%s';\n"
                       "most likely the X server was shut down or you killed/destroyed\n"
                       "the window manager.\n"),
-                    display->name);
+                    display ? display->name : DisplayString (xdisplay));
     }
   else
     {
       meta_warning (_("Fatal IO error %d (%s) on display '%s'.\n"),
                     errno, g_strerror (errno),
-                    display->name);
+                    display ? display->name : DisplayString (xdisplay));
     }
 
   /* Xlib would force an exit anyhow */
-- 
1.7.9