saving uncommitted changes in /etc prior to emerge run

portage/savedconfig/x11-misc/notify-osd-0.9.34/src/dnd.c

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+/*******************************************************************************
+**3456789 123456789 123456789 123456789 123456789 123456789 123456789 123456789
+**      10        20        30        40        50        60        70        80
+**
+** notify-osd
+**
+** dnd.c - implements the "do not disturb"-mode, e.g. gsmgr, presentations
+**
+** Copyright 2009 Canonical Ltd.
+**
+** Authors:
+**    Mirco "MacSlow" Mueller <mirco.mueller@canonical.com>
+**    David Barth <david.barth@canonical.com>
+**
+** This program is free software: you can redistribute it and/or modify it
+** under the terms of the GNU General Public License version 3, as published
+** by the Free Software Foundation.
+**
+** This program is distributed in the hope that it will be useful, but
+** WITHOUT ANY WARRANTY; without even the implied warranties of
+** MERCHANTABILITY, SATISFACTORY QUALITY, or FITNESS FOR A PARTICULAR
+** PURPOSE.  See the GNU General Public License for more details.
+**
+** You should have received a copy of the GNU General Public License along
+** with this program.  If not, see <http://www.gnu.org/licenses/>.
+**
+*******************************************************************************/
+
+#include "config.h"
+#include <stdlib.h>
+
+#include <glib.h>
+#include <glib-object.h>
+
+#include <dbus/dbus-glib.h>
+
+#include <X11/Xproto.h>
+#include <X11/Xlib.h>
+#include <X11/Xutil.h>
+#include <X11/Xatom.h>
+#include <gdk/gdkx.h>
+
+#include <libwnck/libwnck.h>
+
+#include "dbus.h"
+
+static DBusGProxy *gsmgr = NULL;
+
+gboolean
+dnd_is_xscreensaver_active ()
+{
+	GdkDisplay *display = gdk_display_get_default ();
+
+	Atom XA_BLANK =
+		gdk_x11_get_xatom_by_name_for_display(display, "BLANK");
+	Atom XA_LOCK =
+		gdk_x11_get_xatom_by_name_for_display(display, "BLANK");
+	Atom XA_SCREENSAVER_STATUS =
+		gdk_x11_get_xatom_by_name_for_display(display,
+						      "_SCREENSAVER_STATUS");
+	gboolean active = FALSE;
+
+	Atom type;
+	int format;
+	int status;
+	unsigned long nitems, bytesafter;
+	unsigned char* data = NULL;
+
+	Display *dpy = gdk_x11_get_default_xdisplay ();
+	Window   win = gdk_x11_get_default_root_xwindow ();
+
+	gdk_error_trap_push ();
+	status = XGetWindowProperty (dpy, win,
+				     XA_SCREENSAVER_STATUS,
+				     0, 999, False, XA_INTEGER,
+				     &type, &format, &nitems, &bytesafter,
+				     (unsigned char **) &data);
+	gdk_flush ();
+	gdk_error_trap_pop_ignored ();
+
+	if (status == Success
+	    && type == XA_INTEGER
+	    && nitems >= 3
+	    && data != NULL)
+	{
+		CARD32* tmp_data = (CARD32*) data;
+
+		active = (tmp_data[0] == XA_BLANK || tmp_data[0] == XA_LOCK)
+			&& ((time_t)tmp_data[1] > (time_t)666000000L);
+
+		g_debug ("Screensaver is currently active");
+	}
+
+	if (data != NULL)
+		free (data);
+
+	return active;
+}
+
+static DBusGProxy*
+get_screensaver_proxy (void)
+{
+	if (gsmgr == NULL)
+	{
+		DBusGConnection *connection = dbus_get_connection ();
+		gsmgr = dbus_g_proxy_new_for_name (connection,
+						   "org.gnome.ScreenSaver",
+						   "/org/gnome/ScreenSaver",
+						   "org.gnome.ScreenSaver");
+	}
+
+	return gsmgr;
+}	
+
+gboolean
+dnd_is_screensaver_inhibited ()
+{
+	GError  *error = NULL;
+	gboolean inhibited = FALSE;
+	char **list;
+
+	if (! get_screensaver_proxy ())
+		return FALSE;
+
+	if (dbus_g_proxy_call_with_timeout (
+		    gsmgr, "GetInhibitors", 2000, &error,
+		    G_TYPE_INVALID,
+		    G_TYPE_STRV, &list,
+		    G_TYPE_INVALID))
+	{
+		if (error)
+		{
+			g_warning ("dnd_is_screensaver_inhibited(): "
+			           "got error \"%s\"\n",
+			           error->message);
+			g_error_free (error);
+			error = NULL;
+		}
+
+		/* if the list is not empty, the screensaver is inhibited */
+		if (*list)
+		{
+			inhibited = TRUE;
+			g_debug ("Screensaver has been inhibited");
+		}
+		g_strfreev (list);
+	}
+
+	return inhibited;
+}
+
+gboolean
+dnd_is_screensaver_active ()
+{
+	GError  *error = NULL;
+	gboolean active = FALSE;;
+
+	if (! get_screensaver_proxy ())
+		return FALSE;
+
+	dbus_g_proxy_call_with_timeout (
+		gsmgr, "GetActive", 2000, &error,
+		G_TYPE_INVALID,
+		G_TYPE_BOOLEAN, &active,
+		G_TYPE_INVALID);
+
+	if (error)
+	{
+		g_warning ("dnd_is_screensaver_active(): Got error \"%s\"\n",
+		           error->message);
+		g_error_free (error);
+		error = NULL;
+	}
+
+	if (active)
+		g_debug ("Gnome screensaver is active");
+
+	return active;
+}
+
+static gboolean
+dnd_is_online_presence_dnd ()
+{
+	/* TODO: ask FUSA if we're in DND mode */
+
+	return FALSE;
+}
+
+static int
+is_fullscreen_cb (WnckWindow *window, WnckWorkspace *workspace)
+{
+	if (wnck_window_is_visible_on_workspace (window, workspace)
+		&& wnck_window_is_fullscreen (window))
+	{
+		return 0;
+	} else {
+		return 1;
+	}
+}
+
+gboolean
+dnd_has_one_fullscreen_window (void)
+{
+	gboolean result;
+
+	WnckScreen *screen = wnck_screen_get_default ();
+	wnck_screen_force_update (screen);
+	WnckWorkspace *workspace = wnck_screen_get_active_workspace (screen);
+	GList *list = wnck_screen_get_windows (screen);
+	GList *item = g_list_find_custom (list, workspace, (GCompareFunc) is_fullscreen_cb);
+	result = item != NULL;
+#ifdef HAVE_WNCK_SHUTDOWN
+	wnck_shutdown ();
+#endif
+	return result;
+}
+
+/* Tries to determine whether the user is in "do not disturb" mode */
+gboolean
+dnd_dont_disturb_user (void)
+{
+	return (dnd_is_online_presence_dnd()
+		|| dnd_is_xscreensaver_active()
+		|| dnd_is_screensaver_active()
+		|| dnd_is_screensaver_inhibited()
+		|| dnd_has_one_fullscreen_window()
+		);
+}