toolkit/xre/nsGDKErrorHandler.cpp

   1 /* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #include "nsGDKErrorHandler.h"
   7
   8 #include <gtk/gtk.h>
   9 #include <gdk/gdkx.h>
  10 #include <errno.h>
  11 #include <stdlib.h>
  12 #include <string.h>
  13
  14 #include "nsDebug.h"
  15 #include "nsString.h"
  16 #include "nsX11ErrorHandler.h"
  17
  18 #include "prenv.h"
  19
  20
  21 /* See https://bugzilla.gnome.org/show_bug.cgi?id=629608#c8
  22  *
  23  * GDK implements X11 error traps to ignore X11 errors.
  24  * Unfortunatelly We don't know which X11 events can be ignored
  25  * so we have to utilize the Gdk error handler to avoid
  26  * false alarms in Gtk3.
  27  */
  28 static void
  29 GdkErrorHandler(const gchar *log_domain, GLogLevelFlags log_level,
  30                 const gchar *message,  gpointer user_data)
  31 {
  32   if (strstr(message, "X Window System error")) {
  33     XErrorEvent event;
  34     nsDependentCString buffer(message);
  35     char *endptr;
  36
  37     /* Parse Gdk X Window error message which has this format:
  38      * (Details: serial XXXX error_code XXXX request_code XXXX (XXXX) minor_code XXXX)
  39      */
  40     NS_NAMED_LITERAL_CSTRING(serialString, "(Details: serial ");
  41     int32_t start = buffer.Find(serialString);
  42     if (start == kNotFound)
  43       NS_RUNTIMEABORT(message);
  44
  45     start += serialString.Length();
  46     errno = 0;
  47     event.serial = strtol(buffer.BeginReading() + start, &endptr, 10);
  48     if (errno)
  49       NS_RUNTIMEABORT(message);
  50
  51     NS_NAMED_LITERAL_CSTRING(errorCodeString, " error_code ");
  52     if (!StringBeginsWith(Substring(endptr, buffer.EndReading()), errorCodeString))
  53       NS_RUNTIMEABORT(message);
  54
  55     errno = 0;
  56     event.error_code = strtol(endptr + errorCodeString.Length(), &endptr, 10);
  57     if (errno)
  58       NS_RUNTIMEABORT(message);
  59
  60     NS_NAMED_LITERAL_CSTRING(requestCodeString, " request_code ");
  61     if (!StringBeginsWith(Substring(endptr, buffer.EndReading()), requestCodeString))
  62       NS_RUNTIMEABORT(message);
  63
  64     errno = 0;
  65     event.request_code = strtol(endptr + requestCodeString.Length(), &endptr, 10);
  66     if (errno)
  67       NS_RUNTIMEABORT(message);
  68
  69     NS_NAMED_LITERAL_CSTRING(minorCodeString, " minor_code ");
  70     start = buffer.Find(minorCodeString, endptr - buffer.BeginReading());
  71     if (!start)
  72       NS_RUNTIMEABORT(message);
  73
  74     errno = 0;
  75     event.minor_code = strtol(buffer.BeginReading() + start + minorCodeString.Length(), nullptr, 10);
  76     if (errno)
  77       NS_RUNTIMEABORT(message);
  78
  79     event.display = GDK_DISPLAY_XDISPLAY(gdk_display_get_default());
  80     // Gdk does not provide resource ID
  81     event.resourceid = 0;
  82
  83     X11Error(event.display, &event);
  84   } else {
  85     g_log_default_handler(log_domain, log_level, message, user_data);
  86     NS_RUNTIMEABORT(message);
  87   }
  88 }
  89
  90 void
  91 InstallGdkErrorHandler()
  92 {
  93   g_log_set_handler("Gdk",
  94                     (GLogLevelFlags)(G_LOG_LEVEL_ERROR | G_LOG_FLAG_FATAL | G_LOG_FLAG_RECURSION),
  95                     GdkErrorHandler,
  96                     nullptr);
  97   if (PR_GetEnv("MOZ_X_SYNC")) {
  98     XSynchronize(GDK_DISPLAY_XDISPLAY(gdk_display_get_default()), True);
  99   }
 100 }