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
  38 #include <sys/types.h>
  39 #include <sys/wait.h>
  40 #include <unistd.h>
  41 #include <signal.h>
  42
  43 #ifdef HAVE_DBUS
  44
  45 #include <dbus/dbus.h>
  46
  47 #define GS_SERVICE   "org.gnome.ScreenSaver"
  48 #define GS_PATH      "/org/gnome/ScreenSaver"
  49 #define GS_INTERFACE "org.gnome.ScreenSaver"
  50
  51 #define FDS_SERVICE   "org.freedesktop.ScreenSaver"
  52 #define FDS_PATH      "/ScreenSaver"
  53 #define FDS_INTERFACE "org.freedesktop.ScreenSaver"
  54
  55 #endif
  56
  57 /*****************************************************************************
  58  * Local prototypes
  59  *****************************************************************************/
  60 static int  Activate     ( vlc_object_t * );
  61 static void  Deactivate   ( vlc_object_t * );
  62
  63 static void Run          ( intf_thread_t *p_intf );
  64
  65 #ifdef HAVE_DBUS
  66
  67 static DBusConnection * dbus_init( intf_thread_t *p_intf );
  68 static void poke_screensaver( intf_thread_t *p_intf,
  69                               DBusConnection *p_connection );
  70 static void screensaver_send_message_void ( intf_thread_t *p_intf,
  71                                        DBusConnection *p_connection,
  72                                        const char *psz_service,
  73                                        const char *psz_path,
  74                                        const char *psz_interface,
  75                                        const char *psz_name );
  76 static bool screensaver_is_running( DBusConnection *p_connection, const char *psz_service );
  77
  78
  79 struct intf_sys_t
  80 {
  81     DBusConnection *p_connection;
  82 };
  83
  84 #endif
  85
  86 /*****************************************************************************
  87  * Module descriptor
  88  *****************************************************************************/
  89 vlc_module_begin ()
  90     set_description( N_("X Screensaver disabler") )
  91     set_capability( "interface", 0 )
  92     set_callbacks( Activate, Deactivate )
  93 vlc_module_end ()
  94
  95 /*****************************************************************************
  96  * Activate: initialize and create stuff
  97  *****************************************************************************/
  98 static int Activate( vlc_object_t *p_this )
  99 {
 100     intf_thread_t *p_intf = (intf_thread_t*)p_this;
 101
 102     p_intf->pf_run = Run;
 103
 104 #ifdef HAVE_DBUS
 105     p_intf->p_sys = (intf_sys_t *)malloc( sizeof( intf_sys_t ) );
 106     if( !p_intf->p_sys ) return VLC_ENOMEM;
 107 #endif
 108
 109     return VLC_SUCCESS;
 110 }
 111
 112 /*****************************************************************************
 113  * Deactivate: uninitialize and cleanup
 114  *****************************************************************************/
 115 static void Deactivate( vlc_object_t *p_this )
 116 {
 117 #ifdef HAVE_DBUS
 118     intf_thread_t *p_intf = (intf_thread_t*)p_this;
 119
 120     if( p_intf->p_sys->p_connection )
 121     {
 122         dbus_connection_unref( p_intf->p_sys->p_connection );
 123     }
 124
 125     free( p_intf->p_sys );
 126     p_intf->p_sys = NULL;
 127 #endif
 128 }
 129
 130 /*****************************************************************************
 131  * Execute: Spawns a process using execv()
 132  *****************************************************************************/
 133 static void Execute( intf_thread_t *p_this, const char *const *ppsz_args )
 134 {
 135     pid_t pid = fork();
 136     switch( pid )
 137     {
 138         case 0:     /* we're the child */
 139         {
 140             sigset_t set;
 141             sigemptyset (&set);
 142             pthread_sigmask (SIG_SETMASK, &set, NULL);
 143
 144             /* We don't want output */
 145             if( ( freopen( "/dev/null", "w", stdout ) != NULL )
 146              && ( freopen( "/dev/null", "w", stderr ) != NULL ) )
 147                 execv( ppsz_args[0] , (char *const *)ppsz_args );
 148             /* If the file we want to execute doesn't exist we exit() */
 149             exit( EXIT_FAILURE );
 150         }
 151         case -1:    /* we're the error */
 152             msg_Dbg( p_this, "Couldn't fork() while launching %s",
 153                      ppsz_args[0] );
 154             break;
 155         default:    /* we're the parent */
 156             /* Wait for the child to exit.
 157              * We will not deadlock because we ran "/bin/sh &" */
 158             while( waitpid( pid, NULL, 0 ) != pid);
 159             break;
 160     }
 161 }
 162
 163 /*****************************************************************************
 164  * Run: main thread
 165  *****************************************************************************
 166  * This part of the module is in a separate thread so that we do not have
 167  * too much system() overhead.
 168  *****************************************************************************/
 169 static void Run( intf_thread_t *p_intf )
 170 {
 171     int canc = vlc_savecancel();
 172 #ifdef HAVE_DBUS
 173     p_intf->p_sys->p_connection = dbus_init( p_intf );
 174 #endif
 175
 176     for( ;; )
 177     {
 178         vlc_object_t *p_vout;
 179
 180         p_vout = vlc_object_find( p_intf, VLC_OBJECT_VOUT, FIND_ANYWHERE );
 181
 182         /* If there is a video output, disable xscreensaver */
 183         if( p_vout )
 184         {
 185             input_thread_t *p_input;
 186             p_input = vlc_object_find( p_vout, VLC_OBJECT_INPUT, FIND_PARENT );
 187             vlc_object_release( p_vout );
 188             if( p_input )
 189             {
 190                 if( PLAYING_S == var_GetInteger( p_input, "state" ) )
 191                 {
 192                     /* http://www.jwz.org/xscreensaver/faq.html#dvd */
 193                     const char *const ppsz_xsargs[] = { "/bin/sh", "-c",
 194                             "xscreensaver-command -deactivate &", (char*)NULL };
 195                     Execute( p_intf, ppsz_xsargs );
 196
 197                     /* If we have dbus support, let's communicate directly
 198                        with gnome-screensave else, run
 199                        gnome-screensaver-command */
 200 #ifdef HAVE_DBUS
 201                     poke_screensaver( p_intf, p_intf->p_sys->p_connection );
 202 #else
 203                     const char *const ppsz_gsargs[] = { "/bin/sh", "-c",
 204                             "gnome-screensaver-command --poke &", (char*)NULL };
 205                     Execute( p_intf, ppsz_gsargs );
 206 #endif
 207                     /* FIXME: add support for other screensavers */
 208                 }
 209                 vlc_object_release( p_input );
 210             }
 211         }
 212
 213         vlc_restorecancel( canc );
 214         /* Check screensaver every 30 seconds */
 215         msleep( 30 * CLOCK_FREQ );
 216         canc = vlc_savecancel( );
 217     }
 218 }
 219
 220 #ifdef HAVE_DBUS
 221
 222 static DBusConnection * dbus_init( intf_thread_t *p_intf )
 223 {
 224     DBusError dbus_error;
 225
 226     dbus_error_init (&dbus_error);
 227     DBusConnection * p_connection = dbus_bus_get( DBUS_BUS_SESSION, &dbus_error );
 228
 229     if ( !p_connection )
 230     {
 231         msg_Warn( p_intf, "failed to connect to the D-BUS daemon: %s",
 232                           dbus_error.message);
 233         dbus_error_free( &dbus_error );
 234         return NULL;
 235     }
 236
 237     return p_connection;
 238 }
 239
 240 static void poke_screensaver( intf_thread_t *p_intf,
 241                               DBusConnection *p_connection )
 242 {
 243     if( screensaver_is_running( p_connection, GS_SERVICE ) )
 244     {
 245 #   ifdef SCREENSAVER_DEBUG
 246         msg_Dbg( p_intf, "found a running gnome-screensaver instance" );
 247 #   endif
 248         /* gnome-screensaver changed it's D-Bus interface, so we need both */
 249         screensaver_send_message_void( p_intf, p_connection, GS_SERVICE, GS_PATH,
 250                                        GS_INTERFACE, "Poke" );
 251         screensaver_send_message_void( p_intf, p_connection, GS_SERVICE, GS_PATH,
 252                                        GS_INTERFACE, "SimulateUserActivity" );
 253     }
 254     else if( screensaver_is_running( p_connection, FDS_SERVICE ) )
 255     {
 256 #   ifdef SCREENSAVER_DEBUG
 257         msg_Dbg( p_intf, "found a running freedesktop-screensaver instance" );
 258 #   endif
 259         screensaver_send_message_void( p_intf, p_connection, FDS_SERVICE, FDS_PATH,
 260                                        FDS_INTERFACE, "SimulateUserActivity" );
 261     }
 262 #   ifdef SCREENSAVER_DEBUG
 263     else
 264     {
 265         msg_Dbg( p_intf, "found no running (gnome|freedesktop)-screensaver instance" );
 266     }
 267 #   endif
 268
 269 }
 270
 271 static void screensaver_send_message_void ( intf_thread_t *p_intf,
 272                                        DBusConnection *p_connection,
 273                                        const char *psz_service,
 274                                        const char *psz_path,
 275                                        const char *psz_interface,
 276                                        const char *psz_name )
 277 {
 278     DBusMessage *p_message;
 279
 280     if( !p_connection || !psz_name ) return;
 281
 282     p_message = dbus_message_new_method_call( psz_service, psz_path,
 283                                               psz_interface, psz_name );
 284     if( p_message == NULL )
 285     {
 286         msg_Err( p_intf, "DBUS initialization failed: message initialization" );
 287         return;
 288     }
 289
 290     if( !dbus_connection_send( p_connection, p_message, NULL ) )
 291     {
 292         msg_Err( p_intf, "DBUS communication failed" );
 293     }
 294
 295     dbus_connection_flush( p_connection );
 296
 297     dbus_message_unref( p_message );
 298 }
 299
 300 static bool screensaver_is_running( DBusConnection *p_connection, const char *psz_service )
 301 {
 302     DBusError error;
 303     bool b_return;
 304
 305     if( !p_connection ) return false;
 306
 307     dbus_error_init( &error );
 308     b_return = dbus_bus_name_has_owner( p_connection, psz_service, &error );
 309     if( dbus_error_is_set( &error ) ) dbus_error_free (&error);
 310
 311     return b_return;
 312 }
 313
 314 #endif
 315