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 *****************************************************************************/
34 #include <vlc_input.h>
35 #include <vlc_interface.h>
39 #include <sys/types.h>
49 #define DBUS_API_SUBJECT_TO_CHANGE
50 #include <dbus/dbus.h>
52 #define GS_SERVICE "org.gnome.ScreenSaver"
53 #define GS_PATH "/org/gnome/ScreenSaver"
54 #define GS_INTERFACE "org.gnome.ScreenSaver"
58 /* this is for dbus < 0.3 */
60 #define dbus_bus_name_has_owner(connection, name, err) dbus_bus_service_exists(connection, name, err)
63 /*****************************************************************************
65 *****************************************************************************/
66 static int Activate ( vlc_object_t * );
67 static void Deactivate ( vlc_object_t * );
69 static void Run ( intf_thread_t *p_intf );
73 static DBusConnection * dbus_init( intf_thread_t *p_intf );
74 static void poke_screensaver( intf_thread_t *p_intf,
75 DBusConnection *p_connection );
76 static void screensaver_send_message_void ( intf_thread_t *p_intf,
77 DBusConnection *p_connection,
78 const char *psz_name );
79 static vlc_bool_t screensaver_is_running( DBusConnection *p_connection );
84 DBusConnection *p_connection;
89 /*****************************************************************************
91 *****************************************************************************/
93 set_description( _("X Screensaver disabler") );
94 set_capability( "interface", 0 );
95 set_callbacks( Activate, Deactivate );
98 /*****************************************************************************
99 * Activate: initialize and create stuff
100 *****************************************************************************/
101 static int Activate( vlc_object_t *p_this )
103 intf_thread_t *p_intf = (intf_thread_t*)p_this;
105 p_intf->pf_run = Run;
108 p_intf->p_sys = (intf_sys_t *)malloc( sizeof( intf_sys_t ) );
109 if( !p_intf->p_sys ) return VLC_ENOMEM;
115 /*****************************************************************************
116 * Deactivate: uninitialize and cleanup
117 *****************************************************************************/
118 static void Deactivate( vlc_object_t *p_this )
121 intf_thread_t *p_intf = (intf_thread_t*)p_this;
123 if( p_intf->p_sys->p_connection )
126 dbus_connection_unref( p_intf->p_sys->p_connection );
128 dbus_connection_disconnect( p_intf->p_sys->p_connection );
134 free( p_intf->p_sys );
135 p_intf->p_sys = NULL;
140 /*****************************************************************************
141 * Execute: Spawns a process using execv()
142 *****************************************************************************/
143 static void Execute( intf_thread_t *p_this, const char *const *ppsz_args )
148 case 0: /* we're the child */
152 pthread_sigmask (SIG_SETMASK, &set, NULL);
154 /* We don't want output */
155 if( ( freopen( "/dev/null", "w", stdout ) != NULL )
156 && ( freopen( "/dev/null", "w", stderr ) != NULL ) )
157 execv( ppsz_args[0] , (char *const *)ppsz_args );
158 /* If the file we want to execute doesn't exist we exit() */
159 exit( EXIT_FAILURE );
161 case -1: /* we're the error */
162 msg_Dbg( p_this, "Couldn't fork() while launching %s",
165 default: /* we're the parent */
166 /* Wait for the child to exit.
167 * We will not deadlock because we ran "/bin/sh &" */
168 while( waitpid( pid, NULL, 0 ) != pid);
173 /*****************************************************************************
175 *****************************************************************************
176 * This part of the module is in a separate thread so that we do not have
177 * too much system() overhead.
178 *****************************************************************************/
179 static void Run( intf_thread_t *p_intf )
181 vlc_object_lock( p_intf );
184 p_intf->p_sys->p_connection = dbus_init( p_intf );
187 while( vlc_object_alive( p_intf ) )
189 vlc_object_t *p_vout;
191 /* Check screensaver every 30 seconds */
192 if( vlc_object_timedwait( p_intf, mdate() + 30000000 ) < 0 )
195 p_vout = vlc_object_find( p_intf, VLC_OBJECT_VOUT, FIND_ANYWHERE );
197 /* If there is a video output, disable xscreensaver */
200 input_thread_t *p_input;
201 p_input = vlc_object_find( p_vout, VLC_OBJECT_INPUT, FIND_PARENT );
202 vlc_object_release( p_vout );
205 if( PLAYING_S == p_input->i_state )
207 /* http://www.jwz.org/xscreensaver/faq.html#dvd */
208 const char *const ppsz_xsargs[] = { "/bin/sh", "-c",
209 "xscreensaver-command -deactivate &", (char*)NULL };
210 Execute( p_intf, ppsz_xsargs );
212 /* If we have dbus support, let's communicate directly
213 with gnome-screensave else, run
214 gnome-screensaver-command */
216 poke_screensaver( p_intf, p_intf->p_sys->p_connection );
218 const char *const ppsz_gsargs[] = { "/bin/sh", "-c",
219 "gnome-screensaver-command --poke &", (char*)NULL };
220 Execute( p_intf, ppsz_gsargs );
222 /* FIXME: add support for other screensavers */
224 vlc_object_release( p_input );
228 vlc_object_unlock( p_intf );
233 static DBusConnection * dbus_init( intf_thread_t *p_intf )
235 DBusError dbus_error;
237 dbus_error_init (&dbus_error);
238 DBusConnection * p_connection = dbus_bus_get( DBUS_BUS_SESSION, &dbus_error );
242 msg_Warn( p_intf, "failed to connect to the D-BUS daemon: %s",
244 dbus_error_free( &dbus_error );
251 static void poke_screensaver( intf_thread_t *p_intf,
252 DBusConnection *p_connection )
254 if( screensaver_is_running( p_connection ) )
256 # ifdef SCREENSAVER_DEBUG
257 msg_Dbg( p_intf, "found a running gnome-screensaver instance" );
259 /* gnome-screensaver changed it's D-Bus interface, so we need both */
260 screensaver_send_message_void( p_intf, p_connection, "Poke" );
261 screensaver_send_message_void( p_intf, p_connection,
262 "SimulateUserActivity" );
264 # ifdef SCREENSAVER_DEBUG
267 msg_Dbg( p_intf, "found no running gnome-screensaver instance" );
272 static void screensaver_send_message_void ( intf_thread_t *p_intf,
273 DBusConnection *p_connection,
274 const char *psz_name )
276 DBusMessage *p_message;
278 if( !p_connection || !psz_name ) return;
280 p_message = dbus_message_new_method_call( GS_SERVICE, GS_PATH,
281 GS_INTERFACE, psz_name );
282 if( p_message == NULL )
284 msg_Err( p_intf, "DBUS initialization failed: message initialization" );
288 if( !dbus_connection_send( p_connection, p_message, NULL ) )
290 msg_Err( p_intf, "DBUS communication failed" );
293 dbus_connection_flush( p_connection );
295 dbus_message_unref( p_message );
298 static vlc_bool_t screensaver_is_running( DBusConnection *p_connection )
303 if( !p_connection ) return VLC_FALSE;
305 dbus_error_init( &error );
306 b_return = dbus_bus_name_has_owner( p_connection, GS_SERVICE, &error );
307 if( dbus_error_is_set( &error ) ) dbus_error_free (&error);