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_SIGNAL_H
  40 #   include <signal.h>
  41 #endif
  42
  43 #ifdef HAVE_DBUS
  44
  45 #define DBUS_API_SUBJECT_TO_CHANGE
  46 #include <dbus/dbus.h>
  47
  48 #define GS_SERVICE   "org.gnome.ScreenSaver"
  49 #define GS_PATH      "/org/gnome/ScreenSaver"
  50 #define GS_INTERFACE "org.gnome.ScreenSaver"
  51
  52 #endif
  53
  54 /* this is for dbus < 0.3 */
  55 #ifndef HAVE_DBUS_1
  56 #define dbus_bus_name_has_owner(connection, name, err) dbus_bus_service_exists(connection, name, err)
  57 #endif
  58
  59 /*****************************************************************************
  60  * Local prototypes
  61  *****************************************************************************/
  62 static int  Activate     ( vlc_object_t * );
  63 static void  Deactivate   ( vlc_object_t * );
  64
  65 static void Run          ( intf_thread_t *p_intf );
  66
  67 #ifdef HAVE_DBUS
  68
  69 static DBusConnection * dbus_init( intf_thread_t *p_intf );
  70 static void poke_screensaver( intf_thread_t *p_intf,
  71                               DBusConnection *p_connection );
  72 static void screensaver_send_message_void ( intf_thread_t *p_intf,
  73                                        DBusConnection *p_connection,
  74                                        const char *psz_name );
  75 static vlc_bool_t screensaver_is_running( DBusConnection *p_connection );
  76
  77
  78 struct intf_sys_t
  79 {
  80     DBusConnection *p_connection;
  81 };
  82
  83 #endif
  84
  85 /*****************************************************************************
  86  * Module descriptor
  87  *****************************************************************************/
  88 vlc_module_begin();
  89     set_description( _("X Screensaver disabler") );
  90     set_capability( "interface", 0 );
  91     set_callbacks( Activate, Deactivate );
  92 vlc_module_end();
  93
  94 /*****************************************************************************
  95  * Activate: initialize and create stuff
  96  *****************************************************************************/
  97 static int Activate( vlc_object_t *p_this )
  98 {
  99     intf_thread_t *p_intf = (intf_thread_t*)p_this;
 100
 101     p_intf->pf_run = Run;
 102
 103 #ifdef HAVE_DBUS
 104     p_intf->p_sys = (intf_sys_t *)malloc( sizeof( intf_sys_t ) );
 105     if( !p_intf->p_sys ) return VLC_ENOMEM;
 106 #endif
 107
 108     return VLC_SUCCESS;
 109 }
 110
 111 /*****************************************************************************
 112  * Deactivate: uninitialize and cleanup
 113  *****************************************************************************/
 114 static void Deactivate( vlc_object_t *p_this )
 115 {
 116 #ifdef HAVE_DBUS
 117     intf_thread_t *p_intf = (intf_thread_t*)p_this;
 118
 119     if( p_intf->p_sys->p_connection )
 120     {
 121 #  ifdef HAVE_DBUS_2
 122         dbus_connection_unref( p_intf->p_sys->p_connection );
 123 #  else
 124         dbus_connection_disconnect( p_intf->p_sys->p_connection );
 125 #  endif
 126     }
 127
 128     if( p_intf->p_sys )
 129     {
 130         free( p_intf->p_sys );
 131         p_intf->p_sys = NULL;
 132     }
 133 #endif
 134 }
 135
 136 /*****************************************************************************
 137  * Execute: Spawns a process using execv()
 138  *****************************************************************************/
 139 static void Execute( intf_thread_t *p_this, const char *const *ppsz_args )
 140 {
 141     pid_t pid = fork();
 142     switch( pid )
 143     {
 144         case 0:     /* we're the child */
 145         {
 146             sigset_t set;
 147             sigemptyset (&set);
 148             pthread_sigmask (SIG_SETMASK, &set, NULL);
 149
 150             /* We don't want output */
 151             if( ( freopen( "/dev/null", "w", stdout ) != NULL )
 152              && ( freopen( "/dev/null", "w", stderr ) != NULL ) )
 153                 execv( ppsz_args[0] , (char *const *)ppsz_args );
 154             /* If the file we want to execute doesn't exist we exit() */
 155             exit( EXIT_FAILURE );
 156         }
 157         case -1:    /* we're the error */
 158             msg_Dbg( p_this, "Couldn't fork() while launching %s",
 159                      ppsz_args[0] );
 160             break;
 161         default:    /* we're the parent */
 162             /* Wait for the child to exit.
 163              * We will not deadlock because we ran "/bin/sh &" */
 164             while( waitpid( pid, NULL, 0 ) != pid);
 165             break;
 166     }
 167 }
 168
 169 /*****************************************************************************
 170  * Run: main thread
 171  *****************************************************************************
 172  * This part of the module is in a separate thread so that we do not have
 173  * too much system() overhead.
 174  *****************************************************************************/
 175 static void Run( intf_thread_t *p_intf )
 176 {
 177     vlc_object_lock( p_intf );
 178
 179 #ifdef HAVE_DBUS
 180     p_intf->p_sys->p_connection = dbus_init( p_intf );
 181 #endif
 182
 183     while( vlc_object_alive( p_intf ) )
 184     {
 185         vlc_object_t *p_vout;
 186
 187         /* Check screensaver every 30 seconds */
 188         if( vlc_object_timedwait( p_intf, mdate() + 30000000 ) < 0 )
 189             continue;
 190
 191         p_vout = vlc_object_find( p_intf, VLC_OBJECT_VOUT, FIND_ANYWHERE );
 192
 193         /* If there is a video output, disable xscreensaver */
 194         if( p_vout )
 195         {
 196             input_thread_t *p_input;
 197             p_input = vlc_object_find( p_vout, VLC_OBJECT_INPUT, FIND_PARENT );
 198             vlc_object_release( p_vout );
 199             if( p_input )
 200             {
 201                 if( PLAYING_S == p_input->i_state )
 202                 {
 203                     /* http://www.jwz.org/xscreensaver/faq.html#dvd */
 204                     const char *const ppsz_xsargs[] = { "/bin/sh", "-c",
 205                             "xscreensaver-command -deactivate &", (char*)NULL };
 206                     Execute( p_intf, ppsz_xsargs );
 207
 208                     /* If we have dbus support, let's communicate directly
 209                        with gnome-screensave else, run
 210                        gnome-screensaver-command */
 211 #ifdef HAVE_DBUS
 212                     poke_screensaver( p_intf, p_intf->p_sys->p_connection );
 213 #else
 214                     const char *const ppsz_gsargs[] = { "/bin/sh", "-c",
 215                             "gnome-screensaver-command --poke &", (char*)NULL };
 216                     Execute( p_intf, ppsz_gsargs );
 217 #endif
 218                     /* FIXME: add support for other screensavers */
 219                 }
 220                 vlc_object_release( p_input );
 221             }
 222         }
 223     }
 224     vlc_object_unlock( p_intf );
 225 }
 226
 227 #ifdef HAVE_DBUS
 228
 229 static DBusConnection * dbus_init( intf_thread_t *p_intf )
 230 {
 231     DBusError dbus_error;
 232
 233     dbus_error_init (&dbus_error);
 234     DBusConnection * p_connection = dbus_bus_get( DBUS_BUS_SESSION, &dbus_error );
 235
 236     if ( !p_connection )
 237     {
 238         msg_Warn( p_intf, "failed to connect to the D-BUS daemon: %s",
 239                           dbus_error.message);
 240         dbus_error_free( &dbus_error );
 241         return NULL;
 242     }
 243
 244     return p_connection;
 245 }
 246
 247 static void poke_screensaver( intf_thread_t *p_intf,
 248                               DBusConnection *p_connection )
 249 {
 250     if( screensaver_is_running( p_connection ) )
 251     {
 252 #   ifdef SCREENSAVER_DEBUG
 253         msg_Dbg( p_intf, "found a running gnome-screensaver instance" );
 254 #   endif
 255         /* gnome-screensaver changed it's D-Bus interface, so we need both */
 256         screensaver_send_message_void( p_intf, p_connection, "Poke" );
 257         screensaver_send_message_void( p_intf, p_connection,
 258                 "SimulateUserActivity" );
 259     }
 260 #   ifdef SCREENSAVER_DEBUG
 261     else
 262     {
 263         msg_Dbg( p_intf, "found no running gnome-screensaver instance" );
 264     }
 265 #   endif
 266 }
 267
 268 static void screensaver_send_message_void ( intf_thread_t *p_intf,
 269                                        DBusConnection *p_connection,
 270                                        const char *psz_name )
 271 {
 272     DBusMessage *p_message;
 273
 274     if( !p_connection || !psz_name ) return;
 275
 276     p_message = dbus_message_new_method_call( GS_SERVICE, GS_PATH,
 277                                               GS_INTERFACE, psz_name );
 278     if( p_message == NULL )
 279     {
 280         msg_Err( p_intf, "DBUS initialization failed: message initialization" );
 281         return;
 282     }
 283
 284     if( !dbus_connection_send( p_connection, p_message, NULL ) )
 285     {
 286         msg_Err( p_intf, "DBUS communication failed" );
 287     }
 288
 289     dbus_connection_flush( p_connection );
 290
 291     dbus_message_unref( p_message );
 292 }
 293
 294 static vlc_bool_t screensaver_is_running( DBusConnection *p_connection )
 295 {
 296     DBusError error;
 297     vlc_bool_t b_return;
 298
 299     if( !p_connection ) return VLC_FALSE;
 300
 301     dbus_error_init( &error );
 302     b_return = dbus_bus_name_has_owner( p_connection, GS_SERVICE, &error );
 303     if( dbus_error_is_set( &error ) ) dbus_error_free (&error);
 304
 305     return b_return;
 306 }
 307
 308 #endif
 309