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 #ifdef HAVE_CONFIG_H
  30 # include "config.h"
  31 #endif
  32
  33 #include <vlc/vlc.h>
  34 #include <vlc_input.h>
  35 #include <vlc_interface.h>
  36 #include <vlc_aout.h>
  37 #include <vlc_vout.h>
  38
  39 #include <sys/types.h>
  40 #include <sys/wait.h>
  41 #include <unistd.h>
  42
  43 #ifdef HAVE_SIGNAL_H
  44 #   include <signal.h>
  45 #endif
  46
  47 #ifdef HAVE_DBUS
  48
  49 #define DBUS_API_SUBJECT_TO_CHANGE
  50 #include <dbus/dbus.h>
  51
  52 #define GS_SERVICE   "org.gnome.ScreenSaver"
  53 #define GS_PATH      "/org/gnome/ScreenSaver"
  54 #define GS_INTERFACE "org.gnome.ScreenSaver"
  55
  56 #endif
  57
  58 /* this is for dbus < 0.3 */
  59 #ifndef HAVE_DBUS_1
  60 #define dbus_bus_name_has_owner(connection, name, err) dbus_bus_service_exists(connection, name, err)
  61 #endif
  62
  63 /*****************************************************************************
  64  * Local prototypes
  65  *****************************************************************************/
  66 static int  Activate     ( vlc_object_t * );
  67 static void  Deactivate   ( vlc_object_t * );
  68
  69 static void Run          ( intf_thread_t *p_intf );
  70
  71 #ifdef HAVE_DBUS
  72
  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 bool screensaver_is_running( DBusConnection *p_connection );
  80
  81
  82 struct intf_sys_t
  83 {
  84     DBusConnection *p_connection;
  85 };
  86
  87 #endif
  88
  89 /*****************************************************************************
  90  * Module descriptor
  91  *****************************************************************************/
  92 vlc_module_begin();
  93     set_description( _("X Screensaver disabler") );
  94     set_capability( "interface", 0 );
  95     set_callbacks( Activate, Deactivate );
  96 vlc_module_end();
  97
  98 /*****************************************************************************
  99  * Activate: initialize and create stuff
 100  *****************************************************************************/
 101 static int Activate( vlc_object_t *p_this )
 102 {
 103     intf_thread_t *p_intf = (intf_thread_t*)p_this;
 104
 105     p_intf->pf_run = Run;
 106
 107 #ifdef HAVE_DBUS
 108     p_intf->p_sys = (intf_sys_t *)malloc( sizeof( intf_sys_t ) );
 109     if( !p_intf->p_sys ) return VLC_ENOMEM;
 110 #endif
 111
 112     return VLC_SUCCESS;
 113 }
 114
 115 /*****************************************************************************
 116  * Deactivate: uninitialize and cleanup
 117  *****************************************************************************/
 118 static void Deactivate( vlc_object_t *p_this )
 119 {
 120 #ifdef HAVE_DBUS
 121     intf_thread_t *p_intf = (intf_thread_t*)p_this;
 122
 123     if( p_intf->p_sys->p_connection )
 124     {
 125 #  ifdef HAVE_DBUS_2
 126         dbus_connection_unref( p_intf->p_sys->p_connection );
 127 #  else
 128         dbus_connection_disconnect( p_intf->p_sys->p_connection );
 129 #  endif
 130     }
 131
 132     free( p_intf->p_sys );
 133     p_intf->p_sys = NULL;
 134 #endif
 135 }
 136
 137 /*****************************************************************************
 138  * Execute: Spawns a process using execv()
 139  *****************************************************************************/
 140 static void Execute( intf_thread_t *p_this, const char *const *ppsz_args )
 141 {
 142     pid_t pid = fork();
 143     switch( pid )
 144     {
 145         case 0:     /* we're the child */
 146         {
 147             sigset_t set;
 148             sigemptyset (&set);
 149             pthread_sigmask (SIG_SETMASK, &set, NULL);
 150
 151             /* We don't want output */
 152             if( ( freopen( "/dev/null", "w", stdout ) != NULL )
 153              && ( freopen( "/dev/null", "w", stderr ) != NULL ) )
 154                 execv( ppsz_args[0] , (char *const *)ppsz_args );
 155             /* If the file we want to execute doesn't exist we exit() */
 156             exit( EXIT_FAILURE );
 157         }
 158         case -1:    /* we're the error */
 159             msg_Dbg( p_this, "Couldn't fork() while launching %s",
 160                      ppsz_args[0] );
 161             break;
 162         default:    /* we're the parent */
 163             /* Wait for the child to exit.
 164              * We will not deadlock because we ran "/bin/sh &" */
 165             while( waitpid( pid, NULL, 0 ) != pid);
 166             break;
 167     }
 168 }
 169
 170 /*****************************************************************************
 171  * Run: main thread
 172  *****************************************************************************
 173  * This part of the module is in a separate thread so that we do not have
 174  * too much system() overhead.
 175  *****************************************************************************/
 176 static void Run( intf_thread_t *p_intf )
 177 {
 178     vlc_object_lock( p_intf );
 179
 180 #ifdef HAVE_DBUS
 181     p_intf->p_sys->p_connection = dbus_init( p_intf );
 182 #endif
 183
 184     while( vlc_object_alive( p_intf ) )
 185     {
 186         vlc_object_t *p_vout;
 187
 188         /* Check screensaver every 30 seconds */
 189         if( vlc_object_timedwait( p_intf, mdate() + 30000000 ) < 0 )
 190             continue;
 191
 192         p_vout = vlc_object_find( p_intf, VLC_OBJECT_VOUT, FIND_ANYWHERE );
 193
 194         /* If there is a video output, disable xscreensaver */
 195         if( p_vout )
 196         {
 197             input_thread_t *p_input;
 198             p_input = vlc_object_find( p_vout, VLC_OBJECT_INPUT, FIND_PARENT );
 199             vlc_object_release( p_vout );
 200             if( p_input )
 201             {
 202                 if( PLAYING_S == p_input->i_state )
 203                 {
 204                     /* http://www.jwz.org/xscreensaver/faq.html#dvd */
 205                     const char *const ppsz_xsargs[] = { "/bin/sh", "-c",
 206                             "xscreensaver-command -deactivate &", (char*)NULL };
 207                     Execute( p_intf, ppsz_xsargs );
 208
 209                     /* If we have dbus support, let's communicate directly
 210                        with gnome-screensave else, run
 211                        gnome-screensaver-command */
 212 #ifdef HAVE_DBUS
 213                     poke_screensaver( p_intf, p_intf->p_sys->p_connection );
 214 #else
 215                     const char *const ppsz_gsargs[] = { "/bin/sh", "-c",
 216                             "gnome-screensaver-command --poke &", (char*)NULL };
 217                     Execute( p_intf, ppsz_gsargs );
 218 #endif
 219                     /* FIXME: add support for other screensavers */
 220                 }
 221                 vlc_object_release( p_input );
 222             }
 223         }
 224     }
 225     vlc_object_unlock( p_intf );
 226 }
 227
 228 #ifdef HAVE_DBUS
 229
 230 static DBusConnection * dbus_init( intf_thread_t *p_intf )
 231 {
 232     DBusError dbus_error;
 233
 234     dbus_error_init (&dbus_error);
 235     DBusConnection * p_connection = dbus_bus_get( DBUS_BUS_SESSION, &dbus_error );
 236
 237     if ( !p_connection )
 238     {
 239         msg_Warn( p_intf, "failed to connect to the D-BUS daemon: %s",
 240                           dbus_error.message);
 241         dbus_error_free( &dbus_error );
 242         return NULL;
 243     }
 244
 245     return p_connection;
 246 }
 247
 248 static void poke_screensaver( intf_thread_t *p_intf,
 249                               DBusConnection *p_connection )
 250 {
 251     if( screensaver_is_running( p_connection ) )
 252     {
 253 #   ifdef SCREENSAVER_DEBUG
 254         msg_Dbg( p_intf, "found a running gnome-screensaver instance" );
 255 #   endif
 256         /* gnome-screensaver changed it's D-Bus interface, so we need both */
 257         screensaver_send_message_void( p_intf, p_connection, "Poke" );
 258         screensaver_send_message_void( p_intf, p_connection,
 259                 "SimulateUserActivity" );
 260     }
 261 #   ifdef SCREENSAVER_DEBUG
 262     else
 263     {
 264         msg_Dbg( p_intf, "found no running gnome-screensaver instance" );
 265     }
 266 #   endif
 267 }
 268
 269 static void screensaver_send_message_void ( intf_thread_t *p_intf,
 270                                        DBusConnection *p_connection,
 271                                        const char *psz_name )
 272 {
 273     DBusMessage *p_message;
 274
 275     if( !p_connection || !psz_name ) return;
 276
 277     p_message = dbus_message_new_method_call( GS_SERVICE, GS_PATH,
 278                                               GS_INTERFACE, psz_name );
 279     if( p_message == NULL )
 280     {
 281         msg_Err( p_intf, "DBUS initialization failed: message initialization" );
 282         return;
 283     }
 284
 285     if( !dbus_connection_send( p_connection, p_message, NULL ) )
 286     {
 287         msg_Err( p_intf, "DBUS communication failed" );
 288     }
 289
 290     dbus_connection_flush( p_connection );
 291
 292     dbus_message_unref( p_message );
 293 }
 294
 295 static bool screensaver_is_running( DBusConnection *p_connection )
 296 {
 297     DBusError error;
 298     bool b_return;
 299
 300     if( !p_connection ) return false;
 301
 302     dbus_error_init( &error );
 303     b_return = dbus_bus_name_has_owner( p_connection, GS_SERVICE, &error );
 304     if( dbus_error_is_set( &error ) ) dbus_error_free (&error);
 305
 306     return b_return;
 307 }
 308
 309 #endif
 310