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_plugin.h>
35 #include <vlc_input.h>
36 #include <vlc_interface.h>
40 #include <sys/types.h>
50 #define DBUS_API_SUBJECT_TO_CHANGE
51 #include <dbus/dbus.h>
53 #define GS_SERVICE "org.gnome.ScreenSaver"
54 #define GS_PATH "/org/gnome/ScreenSaver"
55 #define GS_INTERFACE "org.gnome.ScreenSaver"
59 /* this is for dbus < 0.3 */
61 #define dbus_bus_name_has_owner(connection, name, err) dbus_bus_service_exists(connection, name, err)
64 /*****************************************************************************
66 *****************************************************************************/
67 static int Activate ( vlc_object_t * );
68 static void Deactivate ( vlc_object_t * );
70 static void Run ( intf_thread_t *p_intf );
74 static DBusConnection * dbus_init( intf_thread_t *p_intf );
75 static void poke_screensaver( intf_thread_t *p_intf,
76 DBusConnection *p_connection );
77 static void screensaver_send_message_void ( intf_thread_t *p_intf,
78 DBusConnection *p_connection,
79 const char *psz_name );
80 static bool screensaver_is_running( DBusConnection *p_connection );
85 DBusConnection *p_connection;
90 /*****************************************************************************
92 *****************************************************************************/
94 set_description( N_("X Screensaver disabler") );
95 set_capability( "interface", 0 );
96 set_callbacks( Activate, Deactivate );
99 /*****************************************************************************
100 * Activate: initialize and create stuff
101 *****************************************************************************/
102 static int Activate( vlc_object_t *p_this )
104 intf_thread_t *p_intf = (intf_thread_t*)p_this;
106 p_intf->pf_run = Run;
109 p_intf->p_sys = (intf_sys_t *)malloc( sizeof( intf_sys_t ) );
110 if( !p_intf->p_sys ) return VLC_ENOMEM;
116 /*****************************************************************************
117 * Deactivate: uninitialize and cleanup
118 *****************************************************************************/
119 static void Deactivate( vlc_object_t *p_this )
122 intf_thread_t *p_intf = (intf_thread_t*)p_this;
124 if( p_intf->p_sys->p_connection )
127 dbus_connection_unref( p_intf->p_sys->p_connection );
129 dbus_connection_disconnect( p_intf->p_sys->p_connection );
133 free( p_intf->p_sys );
134 p_intf->p_sys = NULL;
138 /*****************************************************************************
139 * Execute: Spawns a process using execv()
140 *****************************************************************************/
141 static void Execute( intf_thread_t *p_this, const char *const *ppsz_args )
146 case 0: /* we're the child */
150 pthread_sigmask (SIG_SETMASK, &set, NULL);
152 /* We don't want output */
153 if( ( freopen( "/dev/null", "w", stdout ) != NULL )
154 && ( freopen( "/dev/null", "w", stderr ) != NULL ) )
155 execv( ppsz_args[0] , (char *const *)ppsz_args );
156 /* If the file we want to execute doesn't exist we exit() */
157 exit( EXIT_FAILURE );
159 case -1: /* we're the error */
160 msg_Dbg( p_this, "Couldn't fork() while launching %s",
163 default: /* we're the parent */
164 /* Wait for the child to exit.
165 * We will not deadlock because we ran "/bin/sh &" */
166 while( waitpid( pid, NULL, 0 ) != pid);
171 /*****************************************************************************
173 *****************************************************************************
174 * This part of the module is in a separate thread so that we do not have
175 * too much system() overhead.
176 *****************************************************************************/
177 static void Run( intf_thread_t *p_intf )
179 vlc_object_lock( p_intf );
182 p_intf->p_sys->p_connection = dbus_init( p_intf );
185 while( vlc_object_alive( p_intf ) )
187 vlc_object_t *p_vout;
189 /* Check screensaver every 30 seconds */
190 if( vlc_object_timedwait( p_intf, mdate() + 30000000 ) < 0 )
193 p_vout = vlc_object_find( p_intf, VLC_OBJECT_VOUT, FIND_ANYWHERE );
195 /* If there is a video output, disable xscreensaver */
198 input_thread_t *p_input;
199 p_input = vlc_object_find( p_vout, VLC_OBJECT_INPUT, FIND_PARENT );
200 vlc_object_release( p_vout );
203 if( PLAYING_S == p_input->i_state )
205 /* http://www.jwz.org/xscreensaver/faq.html#dvd */
206 const char *const ppsz_xsargs[] = { "/bin/sh", "-c",
207 "xscreensaver-command -deactivate &", (char*)NULL };
208 Execute( p_intf, ppsz_xsargs );
210 /* If we have dbus support, let's communicate directly
211 with gnome-screensave else, run
212 gnome-screensaver-command */
214 poke_screensaver( p_intf, p_intf->p_sys->p_connection );
216 const char *const ppsz_gsargs[] = { "/bin/sh", "-c",
217 "gnome-screensaver-command --poke &", (char*)NULL };
218 Execute( p_intf, ppsz_gsargs );
220 /* FIXME: add support for other screensavers */
222 vlc_object_release( p_input );
226 vlc_object_unlock( p_intf );
231 static DBusConnection * dbus_init( intf_thread_t *p_intf )
233 DBusError dbus_error;
235 dbus_error_init (&dbus_error);
236 DBusConnection * p_connection = dbus_bus_get( DBUS_BUS_SESSION, &dbus_error );
240 msg_Warn( p_intf, "failed to connect to the D-BUS daemon: %s",
242 dbus_error_free( &dbus_error );
249 static void poke_screensaver( intf_thread_t *p_intf,
250 DBusConnection *p_connection )
252 if( screensaver_is_running( p_connection ) )
254 # ifdef SCREENSAVER_DEBUG
255 msg_Dbg( p_intf, "found a running gnome-screensaver instance" );
257 /* gnome-screensaver changed it's D-Bus interface, so we need both */
258 screensaver_send_message_void( p_intf, p_connection, "Poke" );
259 screensaver_send_message_void( p_intf, p_connection,
260 "SimulateUserActivity" );
262 # ifdef SCREENSAVER_DEBUG
265 msg_Dbg( p_intf, "found no running gnome-screensaver instance" );
270 static void screensaver_send_message_void ( intf_thread_t *p_intf,
271 DBusConnection *p_connection,
272 const char *psz_name )
274 DBusMessage *p_message;
276 if( !p_connection || !psz_name ) return;
278 p_message = dbus_message_new_method_call( GS_SERVICE, GS_PATH,
279 GS_INTERFACE, psz_name );
280 if( p_message == NULL )
282 msg_Err( p_intf, "DBUS initialization failed: message initialization" );
286 if( !dbus_connection_send( p_connection, p_message, NULL ) )
288 msg_Err( p_intf, "DBUS communication failed" );
291 dbus_connection_flush( p_connection );
293 dbus_message_unref( p_message );
296 static bool screensaver_is_running( DBusConnection *p_connection )
301 if( !p_connection ) return false;
303 dbus_error_init( &error );
304 b_return = dbus_bus_name_has_owner( p_connection, GS_SERVICE, &error );
305 if( dbus_error_is_set( &error ) ) dbus_error_free (&error);