widget/gtk/nsIdleServiceGTK.cpp

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /* vim:expandtab:shiftwidth=4:tabstop=4:
   3  */
   4 /* This Source Code Form is subject to the terms of the Mozilla Public
   5  * License, v. 2.0. If a copy of the MPL was not distributed with this
   6  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   7
   8 #include <gtk/gtk.h>
   9
  10 #include "nsIdleServiceGTK.h"
  11 #include "nsIServiceManager.h"
  12 #include "nsDebug.h"
  13 #include "prlink.h"
  14 #include "mozilla/Logging.h"
  15
  16 using mozilla::LogLevel;
  17
  18 static mozilla::LazyLogModule sIdleLog("nsIIdleService");
  19
  20 typedef bool (*_XScreenSaverQueryExtension_fn)(Display* dpy, int* event_base,
  21                                                  int* error_base);
  22
  23 typedef XScreenSaverInfo* (*_XScreenSaverAllocInfo_fn)(void);
  24
  25 typedef void (*_XScreenSaverQueryInfo_fn)(Display* dpy, Drawable drw,
  26                                           XScreenSaverInfo *info);
  27
  28 static bool sInitialized = false;
  29 static _XScreenSaverQueryExtension_fn _XSSQueryExtension = nullptr;
  30 static _XScreenSaverAllocInfo_fn _XSSAllocInfo = nullptr;
  31 static _XScreenSaverQueryInfo_fn _XSSQueryInfo = nullptr;
  32
  33 static void Initialize()
  34 {
  35     if (!GDK_IS_X11_DISPLAY(gdk_display_get_default()))
  36         return;
  37
  38     // This will leak - See comments in ~nsIdleServiceGTK().
  39     PRLibrary* xsslib = PR_LoadLibrary("libXss.so.1");
  40     if (!xsslib) // ouch.
  41     {
  42         MOZ_LOG(sIdleLog, LogLevel::Warning, ("Failed to find libXss.so!\n"));
  43         return;
  44     }
  45
  46     _XSSQueryExtension = (_XScreenSaverQueryExtension_fn)
  47         PR_FindFunctionSymbol(xsslib, "XScreenSaverQueryExtension");
  48     _XSSAllocInfo = (_XScreenSaverAllocInfo_fn)
  49         PR_FindFunctionSymbol(xsslib, "XScreenSaverAllocInfo");
  50     _XSSQueryInfo = (_XScreenSaverQueryInfo_fn)
  51         PR_FindFunctionSymbol(xsslib, "XScreenSaverQueryInfo");
  52
  53     if (!_XSSQueryExtension)
  54         MOZ_LOG(sIdleLog, LogLevel::Warning, ("Failed to get XSSQueryExtension!\n"));
  55     if (!_XSSAllocInfo)
  56         MOZ_LOG(sIdleLog, LogLevel::Warning, ("Failed to get XSSAllocInfo!\n"));
  57     if (!_XSSQueryInfo)
  58         MOZ_LOG(sIdleLog, LogLevel::Warning, ("Failed to get XSSQueryInfo!\n"));
  59
  60     sInitialized = true;
  61 }
  62
  63 nsIdleServiceGTK::nsIdleServiceGTK()
  64     : mXssInfo(nullptr)
  65 {
  66     Initialize();
  67 }
  68
  69 nsIdleServiceGTK::~nsIdleServiceGTK()
  70 {
  71     if (mXssInfo)
  72         XFree(mXssInfo);
  73
  74 // It is not safe to unload libXScrnSaver until each display is closed because
  75 // the library registers callbacks through XESetCloseDisplay (Bug 397607).
  76 // (Also the library and its functions are scoped for the file not the object.)
  77 #if 0
  78     if (xsslib) {
  79         PR_UnloadLibrary(xsslib);
  80         xsslib = nullptr;
  81     }
  82 #endif
  83 }
  84
  85 bool
  86 nsIdleServiceGTK::PollIdleTime(uint32_t *aIdleTime)
  87 {
  88     if (!sInitialized) {
  89         // For some reason, we could not find xscreensaver.
  90         return false;
  91     }
  92
  93     // Ask xscreensaver about idle time:
  94     *aIdleTime = 0;
  95
  96     // We might not have a display (cf. in xpcshell)
  97     Display *dplay = GDK_DISPLAY_XDISPLAY(gdk_display_get_default());
  98     if (!dplay) {
  99         MOZ_LOG(sIdleLog, LogLevel::Warning, ("No display found!\n"));
 100         return false;
 101     }
 102
 103     if (!_XSSQueryExtension || !_XSSAllocInfo || !_XSSQueryInfo) {
 104         return false;
 105     }
 106
 107     int event_base, error_base;
 108     if (_XSSQueryExtension(dplay, &event_base, &error_base))
 109     {
 110         if (!mXssInfo)
 111             mXssInfo = _XSSAllocInfo();
 112         if (!mXssInfo)
 113             return false;
 114         _XSSQueryInfo(dplay, GDK_ROOT_WINDOW(), mXssInfo);
 115         *aIdleTime = mXssInfo->idle;
 116         return true;
 117     }
 118     // If we get here, we couldn't get to XScreenSaver:
 119     MOZ_LOG(sIdleLog, LogLevel::Warning, ("XSSQueryExtension returned false!\n"));
 120     return false;
 121 }
 122
 123 bool
 124 nsIdleServiceGTK::UsePollMode()
 125 {
 126     return sInitialized;
 127 }