1 files changed, 109 insertions, 0 deletions
diff --git a/toolkit/xre/nsGDKErrorHandler.cpp b/toolkit/xre/nsGDKErrorHandler.cpp
new file mode 100644
index 0000000000..421abdf12f
--- /dev/null
+++ b/toolkit/xre/nsGDKErrorHandler.cpp
@@ -0,0 +1,109 @@
+/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "nsGDKErrorHandler.h"
+
+#include <gtk/gtk.h>
+#include <gdk/gdkx.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+
+#include "nsDebug.h"
+#include "nsString.h"
+#include "nsX11ErrorHandler.h"
+
+#include "prenv.h"
+
+/* See https://bugzilla.gnome.org/show_bug.cgi?id=629608#c8
+ *
+ * GDK implements X11 error traps to ignore X11 errors.
+ * Unfortunatelly We don't know which X11 events can be ignored
+ * so we have to utilize the Gdk error handler to avoid
+ * false alarms in Gtk3.
+ */
+static void GdkErrorHandler(const gchar* log_domain, GLogLevelFlags log_level,
+                            const gchar* message, gpointer user_data) {
+  if (strstr(message, "X Window System error")) {
+    XErrorEvent event;
+    nsDependentCString buffer(message);
+    char* endptr;
+
+    /* Parse Gdk X Window error message which has this format:
+     * (Details: serial XXXX error_code XXXX request_code XXXX (XXXX) minor_code
+     * XXXX)
+     */
+    constexpr auto serialString = "(Details: serial "_ns;
+    int32_t start = buffer.Find(serialString);
+    if (start == kNotFound) {
+      MOZ_CRASH_UNSAFE(message);
+    }
+
+    start += serialString.Length();
+    errno = 0;
+    event.serial = strtol(buffer.BeginReading() + start, &endptr, 10);
+    if (errno) {
+      MOZ_CRASH_UNSAFE(message);
+    }
+
+    constexpr auto errorCodeString = " error_code "_ns;
+    if (!StringBeginsWith(Substring(endptr, buffer.EndReading()),
+                          errorCodeString)) {
+      MOZ_CRASH_UNSAFE(message);
+    }
+
+    errno = 0;
+    event.error_code = strtol(endptr + errorCodeString.Length(), &endptr, 10);
+    if (errno) {
+      MOZ_CRASH_UNSAFE(message);
+    }
+
+    constexpr auto requestCodeString = " request_code "_ns;
+    if (!StringBeginsWith(Substring(endptr, buffer.EndReading()),
+                          requestCodeString)) {
+      MOZ_CRASH_UNSAFE(message);
+    }
+
+    errno = 0;
+    event.request_code =
+        strtol(endptr + requestCodeString.Length(), &endptr, 10);
+    if (errno) {
+      MOZ_CRASH_UNSAFE(message);
+    }
+
+    constexpr auto minorCodeString = " minor_code "_ns;
+    start = buffer.Find(minorCodeString, /* aIgnoreCase = */ false,
+                        endptr - buffer.BeginReading());
+    if (!start) {
+      MOZ_CRASH_UNSAFE(message);
+    }
+
+    errno = 0;
+    event.minor_code = strtol(
+        buffer.BeginReading() + start + minorCodeString.Length(), nullptr, 10);
+    if (errno) {
+      MOZ_CRASH_UNSAFE(message);
+    }
+
+    event.display = GDK_DISPLAY_XDISPLAY(gdk_display_get_default());
+    // Gdk does not provide resource ID
+    event.resourceid = 0;
+
+    X11Error(event.display, &event);
+  } else {
+    g_log_default_handler(log_domain, log_level, message, user_data);
+    MOZ_CRASH_UNSAFE(message);
+  }
+}
+
+void InstallGdkErrorHandler() {
+  g_log_set_handler("Gdk",
+                    (GLogLevelFlags)(G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL |
+                                     G_LOG_FLAG_RECURSION),
+                    GdkErrorHandler, nullptr);
+  if (PR_GetEnv("MOZ_X_SYNC")) {
+    XSynchronize(GDK_DISPLAY_XDISPLAY(gdk_display_get_default()), X11True);
+  }
+}