Source code

Revision control

Other Tools

/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim:expandtab:shiftwidth=4:tabstop=4:
/* 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 */
#include <gtk/gtk.h>
#include "nsUserIdleServiceGTK.h"
#include "nsDebug.h"
#include "prlink.h"
#include "mozilla/Logging.h"
#include "WidgetUtilsGtk.h"
using mozilla::LogLevel;
static mozilla::LazyLogModule sIdleLog("nsIUserIdleService");
typedef bool (*_XScreenSaverQueryExtension_fn)(Display* dpy, int* event_base,
int* error_base);
typedef XScreenSaverInfo* (*_XScreenSaverAllocInfo_fn)(void);
typedef void (*_XScreenSaverQueryInfo_fn)(Display* dpy, Drawable drw,
XScreenSaverInfo* info);
static bool sInitialized = false;
static _XScreenSaverQueryExtension_fn _XSSQueryExtension = nullptr;
static _XScreenSaverAllocInfo_fn _XSSAllocInfo = nullptr;
static _XScreenSaverQueryInfo_fn _XSSQueryInfo = nullptr;
static void Initialize() {
if (!mozilla::widget::GdkIsX11Display()) {
// This will leak - See comments in ~nsUserIdleServiceGTK().
PRLibrary* xsslib = PR_LoadLibrary("");
if (!xsslib) // ouch.
MOZ_LOG(sIdleLog, LogLevel::Warning, ("Failed to find!\n"));
_XSSQueryExtension = (_XScreenSaverQueryExtension_fn)PR_FindFunctionSymbol(
xsslib, "XScreenSaverQueryExtension");
_XSSAllocInfo = (_XScreenSaverAllocInfo_fn)PR_FindFunctionSymbol(
xsslib, "XScreenSaverAllocInfo");
_XSSQueryInfo = (_XScreenSaverQueryInfo_fn)PR_FindFunctionSymbol(
xsslib, "XScreenSaverQueryInfo");
if (!_XSSQueryExtension)
MOZ_LOG(sIdleLog, LogLevel::Warning,
("Failed to get XSSQueryExtension!\n"));
if (!_XSSAllocInfo)
MOZ_LOG(sIdleLog, LogLevel::Warning, ("Failed to get XSSAllocInfo!\n"));
if (!_XSSQueryInfo)
MOZ_LOG(sIdleLog, LogLevel::Warning, ("Failed to get XSSQueryInfo!\n"));
sInitialized = true;
nsUserIdleServiceGTK::nsUserIdleServiceGTK() : mXssInfo(nullptr) {
nsUserIdleServiceGTK::~nsUserIdleServiceGTK() {
if (mXssInfo) XFree(mXssInfo);
// It is not safe to unload libXScrnSaver until each display is closed because
// the library registers callbacks through XESetCloseDisplay (Bug 397607).
// (Also the library and its functions are scoped for the file not the object.)
#if 0
if (xsslib) {
xsslib = nullptr;
bool nsUserIdleServiceGTK::PollIdleTime(uint32_t* aIdleTime) {
if (!sInitialized) {
// For some reason, we could not find xscreensaver.
return false;
// Ask xscreensaver about idle time:
*aIdleTime = 0;
// We might not have a display (cf. in xpcshell)
Display* dplay = GDK_DISPLAY_XDISPLAY(gdk_display_get_default());
if (!dplay) {
MOZ_LOG(sIdleLog, LogLevel::Warning, ("No display found!\n"));
return false;
if (!_XSSQueryExtension || !_XSSAllocInfo || !_XSSQueryInfo) {
return false;
int event_base, error_base;
if (_XSSQueryExtension(dplay, &event_base, &error_base)) {
if (!mXssInfo) mXssInfo = _XSSAllocInfo();
if (!mXssInfo) return false;
_XSSQueryInfo(dplay, GDK_ROOT_WINDOW(), mXssInfo);
*aIdleTime = mXssInfo->idle;
return true;
// If we get here, we couldn't get to XScreenSaver:
MOZ_LOG(sIdleLog, LogLevel::Warning, ("XSSQueryExtension returned false!\n"));
return false;
bool nsUserIdleServiceGTK::UsePollMode() { return sInitialized; }