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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "ui/gfx/x/x11_error_tracker.h"
#include "base/logging.h"
#include "ui/gfx/x/x11_types.h"
namespace {
unsigned char g_x11_error_code = 0;
static gfx::X11ErrorTracker* g_handler = NULL;
int X11ErrorHandler(Display* display, XErrorEvent* error) {
g_x11_error_code = error->error_code;
return 0;
}
} // namespace
namespace gfx {
X11ErrorTracker::X11ErrorTracker() {
// This is a poor-man's check for incorrect usage. It disallows nested
// X11ErrorTracker instances on the same thread.
DCHECK(g_handler == NULL);
g_handler = this;
XSync(GetXDisplay(), False);
old_handler_ = XSetErrorHandler(X11ErrorHandler);
g_x11_error_code = 0;
}
X11ErrorTracker::~X11ErrorTracker() {
g_handler = NULL;
XSetErrorHandler(old_handler_);
}
bool X11ErrorTracker::FoundNewError() {
XSync(GetXDisplay(), False);
unsigned char error = g_x11_error_code;
g_x11_error_code = 0;
return error != 0;
}
} // namespace gfx
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