1 /*****************************************************************************
2 * screensaver.c : disable screen savers when VLC is playing
3 *****************************************************************************
4 * Copyright (C) 2006 the VideoLAN team
7 * Authors: Sam Hocevar <sam@zoy.org>
8 * Benjamin Pracht <bigben AT videolan DOT org>
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston MA 02110-1301, USA.
23 *****************************************************************************/
25 /*****************************************************************************
27 *****************************************************************************/
33 #include <vlc_common.h>
34 #include <vlc_plugin.h>
35 #include <vlc_input.h>
36 #include <vlc_interface.h>
40 #include <sys/types.h>
47 #include <dbus/dbus.h>
49 #define GS_SERVICE "org.gnome.ScreenSaver"
50 #define GS_PATH "/org/gnome/ScreenSaver"
51 #define GS_INTERFACE "org.gnome.ScreenSaver"
55 /*****************************************************************************
57 *****************************************************************************/
58 static int Activate ( vlc_object_t * );
59 static void Deactivate ( vlc_object_t * );
61 static void Run ( intf_thread_t *p_intf );
65 static DBusConnection * dbus_init( intf_thread_t *p_intf );
66 static void poke_screensaver( intf_thread_t *p_intf,
67 DBusConnection *p_connection );
68 static void screensaver_send_message_void ( intf_thread_t *p_intf,
69 DBusConnection *p_connection,
70 const char *psz_name );
71 static bool screensaver_is_running( DBusConnection *p_connection );
76 DBusConnection *p_connection;
81 /*****************************************************************************
83 *****************************************************************************/
85 set_description( N_("X Screensaver disabler") )
86 set_capability( "interface", 0 )
87 set_callbacks( Activate, Deactivate )
90 /*****************************************************************************
91 * Activate: initialize and create stuff
92 *****************************************************************************/
93 static int Activate( vlc_object_t *p_this )
95 intf_thread_t *p_intf = (intf_thread_t*)p_this;
100 p_intf->p_sys = (intf_sys_t *)malloc( sizeof( intf_sys_t ) );
101 if( !p_intf->p_sys ) return VLC_ENOMEM;
107 /*****************************************************************************
108 * Deactivate: uninitialize and cleanup
109 *****************************************************************************/
110 static void Deactivate( vlc_object_t *p_this )
113 intf_thread_t *p_intf = (intf_thread_t*)p_this;
115 if( p_intf->p_sys->p_connection )
117 dbus_connection_unref( p_intf->p_sys->p_connection );
120 free( p_intf->p_sys );
121 p_intf->p_sys = NULL;
125 /*****************************************************************************
126 * Execute: Spawns a process using execv()
127 *****************************************************************************/
128 static void Execute( intf_thread_t *p_this, const char *const *ppsz_args )
133 case 0: /* we're the child */
137 pthread_sigmask (SIG_SETMASK, &set, NULL);
139 /* We don't want output */
140 if( ( freopen( "/dev/null", "w", stdout ) != NULL )
141 && ( freopen( "/dev/null", "w", stderr ) != NULL ) )
142 execv( ppsz_args[0] , (char *const *)ppsz_args );
143 /* If the file we want to execute doesn't exist we exit() */
144 exit( EXIT_FAILURE );
146 case -1: /* we're the error */
147 msg_Dbg( p_this, "Couldn't fork() while launching %s",
150 default: /* we're the parent */
151 /* Wait for the child to exit.
152 * We will not deadlock because we ran "/bin/sh &" */
153 while( waitpid( pid, NULL, 0 ) != pid);
158 /*****************************************************************************
160 *****************************************************************************
161 * This part of the module is in a separate thread so that we do not have
162 * too much system() overhead.
163 *****************************************************************************/
164 static void Run( intf_thread_t *p_intf )
166 int canc = vlc_savecancel();
168 p_intf->p_sys->p_connection = dbus_init( p_intf );
173 vlc_object_t *p_vout;
175 p_vout = vlc_object_find( p_intf, VLC_OBJECT_VOUT, FIND_ANYWHERE );
177 /* If there is a video output, disable xscreensaver */
180 input_thread_t *p_input;
181 p_input = vlc_object_find( p_vout, VLC_OBJECT_INPUT, FIND_PARENT );
182 vlc_object_release( p_vout );
185 if( PLAYING_S == var_GetInteger( p_input, "state" ) )
187 /* http://www.jwz.org/xscreensaver/faq.html#dvd */
188 const char *const ppsz_xsargs[] = { "/bin/sh", "-c",
189 "xscreensaver-command -deactivate &", (char*)NULL };
190 Execute( p_intf, ppsz_xsargs );
192 /* If we have dbus support, let's communicate directly
193 with gnome-screensave else, run
194 gnome-screensaver-command */
196 poke_screensaver( p_intf, p_intf->p_sys->p_connection );
198 const char *const ppsz_gsargs[] = { "/bin/sh", "-c",
199 "gnome-screensaver-command --poke &", (char*)NULL };
200 Execute( p_intf, ppsz_gsargs );
202 /* FIXME: add support for other screensavers */
204 vlc_object_release( p_input );
208 vlc_restorecancel( canc );
209 /* Check screensaver every 30 seconds */
210 msleep( 30 * CLOCK_FREQ );
211 canc = vlc_savecancel( );
217 static DBusConnection * dbus_init( intf_thread_t *p_intf )
219 DBusError dbus_error;
221 dbus_error_init (&dbus_error);
222 DBusConnection * p_connection = dbus_bus_get( DBUS_BUS_SESSION, &dbus_error );
226 msg_Warn( p_intf, "failed to connect to the D-BUS daemon: %s",
228 dbus_error_free( &dbus_error );
235 static void poke_screensaver( intf_thread_t *p_intf,
236 DBusConnection *p_connection )
238 if( screensaver_is_running( p_connection ) )
240 # ifdef SCREENSAVER_DEBUG
241 msg_Dbg( p_intf, "found a running gnome-screensaver instance" );
243 /* gnome-screensaver changed it's D-Bus interface, so we need both */
244 screensaver_send_message_void( p_intf, p_connection, "Poke" );
245 screensaver_send_message_void( p_intf, p_connection,
246 "SimulateUserActivity" );
248 # ifdef SCREENSAVER_DEBUG
251 msg_Dbg( p_intf, "found no running gnome-screensaver instance" );
256 static void screensaver_send_message_void ( intf_thread_t *p_intf,
257 DBusConnection *p_connection,
258 const char *psz_name )
260 DBusMessage *p_message;
262 if( !p_connection || !psz_name ) return;
264 p_message = dbus_message_new_method_call( GS_SERVICE, GS_PATH,
265 GS_INTERFACE, psz_name );
266 if( p_message == NULL )
268 msg_Err( p_intf, "DBUS initialization failed: message initialization" );
272 if( !dbus_connection_send( p_connection, p_message, NULL ) )
274 msg_Err( p_intf, "DBUS communication failed" );
277 dbus_connection_flush( p_connection );
279 dbus_message_unref( p_message );
282 static bool screensaver_is_running( DBusConnection *p_connection )
287 if( !p_connection ) return false;
289 dbus_error_init( &error );
290 b_return = dbus_bus_name_has_owner( p_connection, GS_SERVICE, &error );
291 if( dbus_error_is_set( &error ) ) dbus_error_free (&error);