glue/screensaver-glue.c

   1 /* -*- Mode: C; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2
   3 /*
   4  * screensaver-glue.c
   5  *
   6  * Copyright (C) 2004 Novell, Inc.
   7  *
   8  */
   9
  10 /*
  11  * Permission is hereby granted, free of charge, to any person obtaining a
  12  * copy of this software and associated documentation files (the "Software"),
  13  * to deal in the Software without restriction, including without limitation
  14  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  15  * and/or sell copies of the Software, and to permit persons to whom the
  16  * Software is furnished to do so, subject to the following conditions:
  17  *
  18  * The above copyright notice and this permission notice shall be included in
  19  * all copies or substantial portions of the Software.
  20  *
  21  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  22  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  23  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  24  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  25  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  26  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  27  * DEALINGS IN THE SOFTWARE.
  28  */
  29
  30 #include <config.h>
  31 #include <stdlib.h>
  32
  33 #ifdef HAVE_LIBXSS
  34 #include <X11/Xlib.h>
  35 #include <X11/extensions/scrnsaver.h>
  36
  37 // Once an X-connection is eshtablished, if it breaks, the program terminates.
  38 // So, we can safely store the DISPLAY once it is set and re-use it.
  39 static Display *dsp = NULL;
  40 #endif
  41
  42 int
  43 screensaver_glue_init ()
  44 {
  45 #ifdef HAVE_LIBXSS
  46     // screensaver_info is called only from the Scheduler thread; thus we dont need to enable XInitThreads()
  47     dsp = XOpenDisplay(getenv("DISPLAY"));
  48     return (dsp == NULL ? 0 : 1);
  49 #else
  50     return 0;
  51 #endif
  52 }
  53
  54 int
  55 screensaver_info (int *state, int *kind, unsigned long *til_or_since, unsigned long *idle)
  56 {
  57 #ifdef HAVE_LIBXSS
  58     XScreenSaverInfo ss_info;
  59     int retval;
  60     static int inited = 0;
  61     int event_base, error_base;
  62
  63     if(dsp == NULL) {
  64         return 0;
  65     }
  66
  67     if (XScreenSaverQueryExtension (dsp, &event_base, &error_base))
  68         retval = XScreenSaverQueryInfo (dsp, RootWindow(dsp, XDefaultScreen(dsp)), &ss_info);
  69     else
  70         retval = 0;
  71
  72     if (retval != 0) {
  73         *state = ss_info.state;
  74         *kind = ss_info.kind;
  75         *til_or_since = ss_info.til_or_since;
  76         *idle = ss_info.idle;
  77         return 1;
  78     } else {
  79         return 0;
  80     }
  81 #else
  82     return 0;
  83 #endif
  84 }
  85
  86