remoting/host/linux/x11_util.cc

   1 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #include "remoting/host/linux/x11_util.h"
   6
   7 #include "base/bind.h"
   8
   9 namespace remoting {
  10
  11 static ScopedXErrorHandler* g_handler = nullptr;
  12
  13 ScopedXErrorHandler::ScopedXErrorHandler(const Handler& handler):
  14     handler_(handler),
  15     ok_(true) {
  16   // This is a poor-man's check for incorrect usage. It doesn't handle the case
  17   // where a mix of ScopedXErrorHandler and raw XSetErrorHandler calls are used,
  18   // and it disallows nested ScopedXErrorHandlers on the same thread, despite
  19   // these being perfectly safe.
  20   DCHECK(g_handler == nullptr);
  21   g_handler = this;
  22   previous_handler_ = XSetErrorHandler(HandleXErrors);
  23 }
  24
  25 ScopedXErrorHandler::~ScopedXErrorHandler() {
  26   g_handler = nullptr;
  27   XSetErrorHandler(previous_handler_);
  28 }
  29
  30 namespace {
  31 void IgnoreXErrors(Display* display, XErrorEvent* error) {}
  32 }  // namespace
  33
  34 // Static
  35 ScopedXErrorHandler::Handler ScopedXErrorHandler::Ignore() {
  36   return base::Bind(IgnoreXErrors);
  37 }
  38
  39 int ScopedXErrorHandler::HandleXErrors(Display* display, XErrorEvent* error) {
  40   DCHECK(g_handler != nullptr);
  41   g_handler->ok_ = false;
  42   g_handler->handler_.Run(display, error);
  43   return 0;
  44 }
  45
  46
  47 ScopedXGrabServer::ScopedXGrabServer(Display* display)
  48     : display_(display) {
  49   XGrabServer(display_);
  50 }
  51
  52 ScopedXGrabServer::~ScopedXGrabServer() {
  53   XUngrabServer(display_);
  54   XFlush(display_);
  55 }
  56
  57 }  // namespace remoting