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_common.h>
  34 #include <vlc_plugin.h>
  35 #include <vlc_input.h>
  36 #include <vlc_interface.h>
  37 #include <vlc_aout.h>
  38 #include <vlc_vout.h>
  39
  40 #include <sys/types.h>
  41 #include <sys/wait.h>
  42 #include <unistd.h>
  43 #include <signal.h>
  44
  45 #ifdef HAVE_DBUS
  46
  47 #include <dbus/dbus.h>
  48
  49 #define GS_SERVICE   "org.gnome.ScreenSaver"
  50 #define GS_PATH      "/org/gnome/ScreenSaver"
  51 #define GS_INTERFACE "org.gnome.ScreenSaver"
  52
  53 #define FDS_SERVICE   "org.freedesktop.ScreenSaver"
  54 #define FDS_PATH      "/ScreenSaver"
  55 #define FDS_INTERFACE "org.freedesktop.ScreenSaver"
  56
  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_service,
  75                                        const char *psz_path,
  76                                        const char *psz_interface,
  77                                        const char *psz_name );
  78 static bool screensaver_is_running( DBusConnection *p_connection, const char *psz_service );
  79
  80
  81 struct intf_sys_t
  82 {
  83     DBusConnection *p_connection;
  84 };
  85
  86 #endif
  87
  88 /*****************************************************************************
  89  * Module descriptor
  90  *****************************************************************************/
  91 vlc_module_begin ()
  92     set_description( N_("X Screensaver disabler") )
  93     set_capability( "interface", 0 )
  94     set_callbacks( Activate, Deactivate )
  95 vlc_module_end ()
  96
  97 /*****************************************************************************
  98  * Activate: initialize and create stuff
  99  *****************************************************************************/
 100 static int Activate( vlc_object_t *p_this )
 101 {
 102     intf_thread_t *p_intf = (intf_thread_t*)p_this;
 103
 104     p_intf->pf_run = Run;
 105
 106 #ifdef HAVE_DBUS
 107     p_intf->p_sys = (intf_sys_t *)malloc( sizeof( intf_sys_t ) );
 108     if( !p_intf->p_sys ) return VLC_ENOMEM;
 109 #endif
 110
 111     return VLC_SUCCESS;
 112 }
 113
 114 /*****************************************************************************
 115  * Deactivate: uninitialize and cleanup
 116  *****************************************************************************/
 117 static void Deactivate( vlc_object_t *p_this )
 118 {
 119 #ifdef HAVE_DBUS
 120     intf_thread_t *p_intf = (intf_thread_t*)p_this;
 121
 122     if( p_intf->p_sys->p_connection )
 123     {
 124         dbus_connection_unref( p_intf->p_sys->p_connection );
 125     }
 126
 127     free( p_intf->p_sys );
 128     p_intf->p_sys = NULL;
 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 = fork();
 138     switch( pid )
 139     {
 140         case 0:     /* we're the child */
 141         {
 142             sigset_t set;
 143             sigemptyset (&set);
 144             pthread_sigmask (SIG_SETMASK, &set, NULL);
 145
 146             /* We don't want output */
 147             if( ( freopen( "/dev/null", "w", stdout ) != NULL )
 148              && ( freopen( "/dev/null", "w", stderr ) != NULL ) )
 149                 execv( ppsz_args[0] , (char *const *)ppsz_args );
 150             /* If the file we want to execute doesn't exist we exit() */
 151             exit( EXIT_FAILURE );
 152         }
 153         case -1:    /* we're the error */
 154             msg_Dbg( p_this, "Couldn't fork() while launching %s",
 155                      ppsz_args[0] );
 156             break;
 157         default:    /* we're the parent */
 158             /* Wait for the child to exit.
 159              * We will not deadlock because we ran "/bin/sh &" */
 160             while( waitpid( pid, NULL, 0 ) != pid);
 161             break;
 162     }
 163 }
 164
 165 /*****************************************************************************
 166  * Run: main thread
 167  *****************************************************************************
 168  * This part of the module is in a separate thread so that we do not have
 169  * too much system() overhead.
 170  *****************************************************************************/
 171 static void Run( intf_thread_t *p_intf )
 172 {
 173     int canc = vlc_savecancel();
 174 #ifdef HAVE_DBUS
 175     p_intf->p_sys->p_connection = dbus_init( p_intf );
 176 #endif
 177
 178     for( ;; )
 179     {
 180         vlc_object_t *p_vout;
 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 == var_GetInteger( p_input, "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_restorecancel( canc );
 216         /* Check screensaver every 30 seconds */
 217         msleep( 30 * CLOCK_FREQ );
 218         canc = vlc_savecancel( );
 219     }
 220 }
 221
 222 #ifdef HAVE_DBUS
 223
 224 static DBusConnection * dbus_init( intf_thread_t *p_intf )
 225 {
 226     DBusError dbus_error;
 227
 228     dbus_error_init (&dbus_error);
 229     DBusConnection * p_connection = dbus_bus_get( DBUS_BUS_SESSION, &dbus_error );
 230
 231     if ( !p_connection )
 232     {
 233         msg_Warn( p_intf, "failed to connect to the D-BUS daemon: %s",
 234                           dbus_error.message);
 235         dbus_error_free( &dbus_error );
 236         return NULL;
 237     }
 238
 239     return p_connection;
 240 }
 241
 242 static void poke_screensaver( intf_thread_t *p_intf,
 243                               DBusConnection *p_connection )
 244 {
 245     if( screensaver_is_running( p_connection, GS_SERVICE ) )
 246     {
 247 #   ifdef SCREENSAVER_DEBUG
 248         msg_Dbg( p_intf, "found a running gnome-screensaver instance" );
 249 #   endif
 250         /* gnome-screensaver changed it's D-Bus interface, so we need both */
 251         screensaver_send_message_void( p_intf, p_connection, GS_SERVICE, GS_PATH,
 252                                        GS_INTERFACE, "Poke" );
 253         screensaver_send_message_void( p_intf, p_connection, GS_SERVICE, GS_PATH,
 254                                        GS_INTERFACE, "SimulateUserActivity" );
 255     }
 256     else if( screensaver_is_running( p_connection, FDS_SERVICE ) )
 257     {
 258 #   ifdef SCREENSAVER_DEBUG
 259         msg_Dbg( p_intf, "found a running freedesktop-screensaver instance" );
 260 #   endif
 261         screensaver_send_message_void( p_intf, p_connection, FDS_SERVICE, FDS_PATH,
 262                                        FDS_INTERFACE, "SimulateUserActivity" );
 263     }
 264 #   ifdef SCREENSAVER_DEBUG
 265     else
 266     {
 267         msg_Dbg( p_intf, "found no running (gnome|freedesktop)-screensaver instance" );
 268     }
 269 #   endif
 270
 271 }
 272
 273 static void screensaver_send_message_void ( intf_thread_t *p_intf,
 274                                        DBusConnection *p_connection,
 275                                        const char *psz_service,
 276                                        const char *psz_path,
 277                                        const char *psz_interface,
 278                                        const char *psz_name )
 279 {
 280     DBusMessage *p_message;
 281
 282     if( !p_connection || !psz_name ) return;
 283
 284     p_message = dbus_message_new_method_call( psz_service, psz_path,
 285                                               psz_interface, psz_name );
 286     if( p_message == NULL )
 287     {
 288         msg_Err( p_intf, "DBUS initialization failed: message initialization" );
 289         return;
 290     }
 291
 292     if( !dbus_connection_send( p_connection, p_message, NULL ) )
 293     {
 294         msg_Err( p_intf, "DBUS communication failed" );
 295     }
 296
 297     dbus_connection_flush( p_connection );
 298
 299     dbus_message_unref( p_message );
 300 }
 301
 302 static bool screensaver_is_running( DBusConnection *p_connection, const char *psz_service )
 303 {
 304     DBusError error;
 305     bool b_return;
 306
 307     if( !p_connection ) return false;
 308
 309     dbus_error_init( &error );
 310     b_return = dbus_bus_name_has_owner( p_connection, psz_service, &error );
 311     if( dbus_error_is_set( &error ) ) dbus_error_free (&error);
 312
 313     return b_return;
 314 }
 315
 316 #endif
 317