git.sesse.net Git - vlc/blob - modules/misc/screensaver.c

   1 /*****************************************************************************
   2  * screensaver.c : disable screen savers when VLC is playing
   3  *****************************************************************************
   4  * Copyright (C) 2006 the VideoLAN team
   5  * $Id$
   6  *
   7  * Authors: Sam Hocevar <sam@zoy.org>
   8  *          Benjamin Pracht <bigben AT videolan DOT org>
   9  *
  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.
  14  *
  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.
  19  *
  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  *****************************************************************************/
  24
  25 /*****************************************************************************
  26  * Preamble
  27  *****************************************************************************/
  28
  29 #include <vlc/vlc.h>
  30 #include <vlc_input.h>
  31 #include <vlc_interface.h>
  32 #include <vlc_aout.h>
  33 #include <vlc_vout.h>
  34
  35 #include <sys/types.h>
  36 #include <sys/wait.h>
  37 #include <unistd.h>
  38
  39 #ifdef HAVE_DBUS
  40
  41 #define DBUS_API_SUBJECT_TO_CHANGE
  42 #include <dbus/dbus.h>
  43
  44 #define GS_SERVICE   "org.gnome.ScreenSaver"
  45 #define GS_PATH      "/org/gnome/ScreenSaver"
  46 #define GS_INTERFACE "org.gnome.ScreenSaver"
  47
  48 #endif
  49
  50 /* this is for dbus < 0.3 */
  51 #ifndef HAVE_DBUS_1
  52 #define dbus_bus_name_has_owner(connection, name, err) dbus_bus_service_exists(connection, name, err)
  53 #endif
  54
  55 /*****************************************************************************
  56  * Local prototypes
  57  *****************************************************************************/
  58 static int  Activate     ( vlc_object_t * );
  59 static void  Deactivate   ( vlc_object_t * );
  60
  61 static void Run          ( intf_thread_t *p_intf );
  62
  63 #ifdef HAVE_DBUS
  64
  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 vlc_bool_t screensaver_is_running( DBusConnection *p_connection );
  72
  73
  74 struct intf_sys_t
  75 {
  76     DBusConnection *p_connection;
  77 };
  78
  79 #endif
  80
  81 /*****************************************************************************
  82  * Module descriptor
  83  *****************************************************************************/
  84 vlc_module_begin();
  85     set_description( _("X Screensaver disabler") );
  86     set_capability( "interface", 0 );
  87     set_callbacks( Activate, Deactivate );
  88 vlc_module_end();
  89
  90 /*****************************************************************************
  91  * Activate: initialize and create stuff
  92  *****************************************************************************/
  93 static int Activate( vlc_object_t *p_this )
  94 {
  95     intf_thread_t *p_intf = (intf_thread_t*)p_this;
  96
  97     p_intf->pf_run = Run;
  98
  99 #ifdef HAVE_DBUS
 100     p_intf->p_sys = (intf_sys_t *)malloc( sizeof( intf_sys_t ) );
 101     if( !p_intf->p_sys ) return VLC_ENOMEM;
 102 #endif
 103
 104     return VLC_SUCCESS;
 105 }
 106
 107 /*****************************************************************************
 108  * Deactivate: uninitialize and cleanup
 109  *****************************************************************************/
 110 static void Deactivate( vlc_object_t *p_this )
 111 {
 112 #ifdef HAVE_DBUS
 113     intf_thread_t *p_intf = (intf_thread_t*)p_this;
 114
 115     if( p_intf->p_sys->p_connection )
 116     {
 117 #  ifdef HAVE_DBUS_2
 118         dbus_connection_unref( p_intf->p_sys->p_connection );
 119 #  else
 120         dbus_connection_disconnect( p_intf->p_sys->p_connection );
 121 #  endif
 122     }
 123
 124     if( p_intf->p_sys )
 125     {
 126         free( p_intf->p_sys );
 127         p_intf->p_sys = NULL;
 128     }
 129 #endif
 130 }
 131
 132 /*****************************************************************************
 133  * Execute: Spawns a process using execv()
 134  *****************************************************************************/
 135 static void Execute( intf_thread_t *p_this, const char *const *ppsz_args )
 136 {
 137     pid_t pid;
 138     switch( pid = fork() )
 139     {
 140         case 0:     /* we're the child */
 141             /* We don't want output */
 142             freopen( "/dev/null", "w", stdout );
 143             freopen( "/dev/null", "w", stderr );
 144             execv( ppsz_args[0] , (char *const *)ppsz_args );
 145             /* If the file we want to execute doesn't exist we exit() */
 146             exit( 1 );
 147             break;
 148         case -1:    /* we're the error */
 149             msg_Dbg( p_this, "Couldn't fork() while launching %s",
 150                      ppsz_args[0] );
 151             break;
 152         default:    /* we're the parent */
 153             /* Wait for the child to exit.
 154              * We will not deadlock because we ran "/bin/sh &" */
 155             while( waitpid( pid, NULL, 0 ) != pid);
 156             break;
 157     }
 158 }
 159
 160 /*****************************************************************************
 161  * Run: main thread
 162  *****************************************************************************
 163  * This part of the module is in a separate thread so that we do not have
 164  * too much system() overhead.
 165  *****************************************************************************/
 166 static void Run( intf_thread_t *p_intf )
 167 {
 168     vlc_object_lock( p_intf );
 169
 170 #ifdef HAVE_DBUS
 171     p_intf->p_sys->p_connection = dbus_init( p_intf );
 172 #endif
 173
 174     for(;;)
 175     {
 176         vlc_object_t *p_vout;
 177
 178         /* Check screensaver every 30 seconds */
 179         if( vlc_object_timedwait( p_intf, mdate() + 30000000 ) < 0 )
 180             break;
 181
 182         p_vout = vlc_object_find( p_intf, VLC_OBJECT_VOUT, FIND_ANYWHERE );
 183
 184         /* If there is a video output, disable xscreensaver */
 185         if( p_vout )
 186         {
 187             input_thread_t *p_input;
 188             p_input = vlc_object_find( p_vout, VLC_OBJECT_INPUT, FIND_PARENT );
 189             vlc_object_release( p_vout );
 190             if( p_input )
 191             {
 192                 if( PLAYING_S == p_input->i_state )
 193                 {
 194                     /* http://www.jwz.org/xscreensaver/faq.html#dvd */
 195                     const char *const ppsz_xsargs[] = { "/bin/sh", "-c",
 196                             "xscreensaver-command -deactivate &", (char*)NULL };
 197                     Execute( p_intf, ppsz_xsargs );
 198
 199                     /* If we have dbus support, let's communicate directly
 200                        with gnome-screensave else, run
 201                        gnome-screensaver-command */
 202 #ifdef HAVE_DBUS
 203                     poke_screensaver( p_intf, p_intf->p_sys->p_connection );
 204 #else
 205                     const char *const ppsz_gsargs[] = { "/bin/sh", "-c",
 206                             "gnome-screensaver-command --poke &", (char*)NULL };
 207                     Execute( p_intf, ppsz_gsargs );
 208 #endif
 209                     /* FIXME: add support for other screensavers */
 210                 }
 211                 vlc_object_release( p_input );
 212             }
 213         }
 214     }
 215     vlc_object_unlock( p_intf );
 216 }
 217
 218 #ifdef HAVE_DBUS
 219
 220 static DBusConnection * dbus_init( intf_thread_t *p_intf )
 221 {
 222     DBusError dbus_error;
 223
 224     dbus_error_init (&dbus_error);
 225     DBusConnection * p_connection = dbus_bus_get( DBUS_BUS_SESSION, &dbus_error );
 226
 227     if ( !p_connection )
 228     {
 229         msg_Warn( p_intf, "failed to connect to the D-BUS daemon: %s",
 230                           dbus_error.message);
 231         dbus_error_free( &dbus_error );
 232         return NULL;
 233     }
 234
 235     return p_connection;
 236 }
 237
 238 static void poke_screensaver( intf_thread_t *p_intf,
 239                               DBusConnection *p_connection )
 240 {
 241     if( screensaver_is_running( p_connection ) )
 242     {
 243 #   ifdef SCREENSAVER_DEBUG
 244         msg_Dbg( p_intf, "found a running gnome-screensaver instance" );
 245 #   endif
 246         /* gnome-screensaver changed it's D-Bus interface, so we need both */
 247         screensaver_send_message_void( p_intf, p_connection, "Poke" );
 248         screensaver_send_message_void( p_intf, p_connection,
 249                 "SimulateUserActivity" );
 250     }
 251 #   ifdef SCREENSAVER_DEBUG
 252     else
 253     {
 254         msg_Dbg( p_intf, "found no running gnome-screensaver instance" );
 255     }
 256 #   endif
 257 }
 258
 259 static void screensaver_send_message_void ( intf_thread_t *p_intf,
 260                                        DBusConnection *p_connection,
 261                                        const char *psz_name )
 262 {
 263     DBusMessage *p_message;
 264
 265     if( !p_connection || !psz_name ) return;
 266
 267     p_message = dbus_message_new_method_call( GS_SERVICE, GS_PATH,
 268                                               GS_INTERFACE, psz_name );
 269     if( p_message == NULL )
 270     {
 271         msg_Err( p_intf, "DBUS initialization failed: message initialization" );
 272         return;
 273     }
 274
 275     if( !dbus_connection_send( p_connection, p_message, NULL ) )
 276     {
 277         msg_Err( p_intf, "DBUS communication failed" );
 278     }
 279
 280     dbus_connection_flush( p_connection );
 281
 282     dbus_message_unref( p_message );
 283 }
 284
 285 static vlc_bool_t screensaver_is_running( DBusConnection *p_connection )
 286 {
 287     DBusError error;
 288     vlc_bool_t b_return;
 289
 290     if( !p_connection ) return VLC_FALSE;
 291
 292     dbus_error_init( &error );
 293     b_return = dbus_bus_name_has_owner( p_connection, GS_SERVICE, &error );
 294     if( dbus_error_is_set( &error ) ) dbus_error_free (&error);
 295
 296     return b_return;
 297 }
 298
 299 #endif
 300