src/seat-unity.c

   1 /*
   2  * Copyright (C) 2012-2013 Robert Ancell.
   3  * Author: Robert Ancell <robert.ancell@canonical.com>
   4  *
   5  * This program is free software: you can redistribute it and/or modify it under
   6  * the terms of the GNU General Public License as published by the Free Software
   7  * Foundation, either version 3 of the License, or (at your option) any later
   8  * version. See http://www.gnu.org/copyleft/gpl.html the full text of the
   9  * license.
  10  */
  11
  12 #include <string.h>
  13 #include <fcntl.h>
  14 #include <errno.h>
  15 #include <glib/gstdio.h>
  16
  17 #include "seat-unity.h"
  18 #include "configuration.h"
  19 #include "xserver-local.h"
  20 #include "xgreeter.h"
  21 #include "xsession.h"
  22 #include "mir-server.h"
  23 #include "vt.h"
  24 #include "plymouth.h"
  25
  26 typedef enum
  27 {
  28    USC_MESSAGE_PING = 0,
  29    USC_MESSAGE_PONG = 1,
  30    USC_MESSAGE_READY = 2,
  31    USC_MESSAGE_SESSION_CONNECTED = 3,
  32    USC_MESSAGE_SET_ACTIVE_SESSION = 4
  33 } USCMessageID;
  34
  35 struct SeatUnityPrivate
  36 {
  37     /* VT we are running on */
  38     gint vt;
  39
  40     /* TRUE if waiting for X server to start before stopping Plymouth */
  41     gboolean stopping_plymouth;
  42
  43     /* File to log to */
  44     gchar *log_file;
  45
  46     /* Filename of Mir socket */
  47     gchar *mir_socket_filename;
  48
  49     /* Pipes to communicate with compositor */
  50     int to_compositor_pipe[2];
  51     int from_compositor_pipe[2];
  52
  53     /* IO channel listening on for messages from the compositor */
  54     GIOChannel *from_compositor_channel;
  55
  56     /* TRUE when the compositor indicates it is ready */
  57     gboolean compositor_ready;
  58
  59     /* Buffer reading from channel */
  60     guint8 *read_buffer;
  61     gsize read_buffer_length;
  62     gsize read_buffer_n_used;
  63
  64     /* Compositor process */
  65     Process *compositor_process;
  66
  67     /* Timeout when waiting for compositor to start */
  68     guint compositor_timeout;
  69
  70     /* Next Mir ID to use for a compositor client */
  71     gint next_id;
  72
  73     /* TRUE if using VT switching fallback */
  74     gboolean use_vt_switching;
  75
  76     /* The currently visible session */
  77     Session *active_session;
  78     DisplayServer *active_display_server;
  79 };
  80
  81 G_DEFINE_TYPE (SeatUnity, seat_unity, SEAT_TYPE);
  82
  83 static void
  84 seat_unity_setup (Seat *seat)
  85 {
  86     seat_set_can_switch (seat, TRUE);
  87     SEAT_CLASS (seat_unity_parent_class)->setup (seat);
  88 }
  89
  90 static void
  91 compositor_stopped_cb (Process *process, SeatUnity *seat)
  92 {
  93     if (seat->priv->compositor_timeout != 0)
  94         g_source_remove (seat->priv->compositor_timeout);
  95     seat->priv->compositor_timeout = 0;
  96
  97     /* Finished with the VT */
  98     vt_unref (seat->priv->vt);
  99     seat->priv->vt = -1;
 100
 101     if (seat_get_is_stopping (SEAT (seat)))
 102     {
 103         SEAT_CLASS (seat_unity_parent_class)->stop (SEAT (seat));
 104         return;
 105     }
 106
 107     /* If stopped before it was ready, then revert to VT mode */
 108     if (!seat->priv->compositor_ready)
 109     {
 110         g_debug ("Compositor failed to start, switching to VT mode");
 111         seat->priv->use_vt_switching = TRUE;
 112         SEAT_CLASS (seat_unity_parent_class)->start (SEAT (seat));
 113         return;
 114     }
 115
 116     g_debug ("Stopping Unity seat, compositor terminated");
 117
 118     if (seat->priv->stopping_plymouth)
 119     {
 120         g_debug ("Stopping Plymouth, compositor failed to start");
 121         plymouth_quit (FALSE);
 122         seat->priv->stopping_plymouth = FALSE;
 123     }
 124
 125     seat_stop (SEAT (seat));
 126 }
 127
 128 static void
 129 compositor_run_cb (Process *process, SeatUnity *seat)
 130 {
 131     int fd;
 132
 133     /* Make input non-blocking */
 134     fd = open ("/dev/null", O_RDONLY);
 135     dup2 (fd, STDIN_FILENO);
 136     close (fd);
 137
 138     /* Redirect output to logfile */
 139     if (seat->priv->log_file)
 140     {
 141          int fd;
 142
 143          fd = g_open (seat->priv->log_file, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 144          if (fd < 0)
 145              g_warning ("Failed to open log file %s: %s", seat->priv->log_file, g_strerror (errno));
 146          else
 147          {
 148              dup2 (fd, STDOUT_FILENO);
 149              dup2 (fd, STDERR_FILENO);
 150              close (fd);
 151          }
 152     }
 153
 154     if (seat->priv->stopping_plymouth)
 155     {
 156         seat->priv->stopping_plymouth = FALSE;
 157         plymouth_quit (TRUE);
 158     }
 159 }
 160
 161 static void
 162 write_message (SeatUnity *seat, guint16 id, const guint8 *payload, guint16 payload_length)
 163 {
 164     guint8 *data;
 165     gsize data_length = 4 + payload_length;
 166
 167     data = g_malloc (data_length);
 168     data[0] = id >> 8;
 169     data[1] = id & 0xFF;
 170     data[2] = payload_length >> 8;
 171     data[3] = payload_length & 0xFF;
 172     memcpy (data + 4, payload, payload_length);
 173
 174     errno = 0;
 175     if (write (seat->priv->to_compositor_pipe[1], data, data_length) != data_length)
 176         g_warning ("Failed to write to compositor: %s", strerror (errno));
 177 }
 178
 179 static gboolean
 180 read_cb (GIOChannel *source, GIOCondition condition, gpointer data)
 181 {
 182     SeatUnity *seat = data;
 183     gsize n_to_read = 0;
 184     guint16 id, payload_length;
 185     /*guint8 *payload;*/
 186
 187     if (condition == G_IO_HUP)
 188     {
 189         g_debug ("Compositor closed communication channel");
 190         return FALSE;
 191     }
 192
 193     /* Work out how much required for a message */
 194     if (seat->priv->read_buffer_n_used < 4)
 195         n_to_read = 4 - seat->priv->read_buffer_n_used;
 196     else
 197     {
 198         payload_length = seat->priv->read_buffer[2] << 8 | seat->priv->read_buffer[3];
 199         n_to_read = 4 + payload_length - seat->priv->read_buffer_n_used;
 200     }
 201
 202     /* Read from compositor */
 203     if (n_to_read > 0)
 204     {
 205         gsize n_total, n_read = 0;
 206         GIOStatus status;
 207         GError *error = NULL;
 208
 209         n_total = seat->priv->read_buffer_n_used + n_to_read;
 210         if (seat->priv->read_buffer_length < n_total)
 211             seat->priv->read_buffer = g_realloc (seat->priv->read_buffer, n_total);
 212
 213         status = g_io_channel_read_chars (source,
 214                                           (gchar *)seat->priv->read_buffer + seat->priv->read_buffer_n_used,
 215                                           n_to_read,
 216                                           &n_read,
 217                                           &error);
 218         if (error)
 219             g_warning ("Failed to read from compositor: %s", error->message);
 220         if (status != G_IO_STATUS_NORMAL)
 221             return TRUE;
 222         g_clear_error (&error);
 223         seat->priv->read_buffer_n_used += n_read;
 224     }
 225
 226     /* Read header */
 227     if (seat->priv->read_buffer_n_used < 4)
 228          return TRUE;
 229     id = seat->priv->read_buffer[0] << 8 | seat->priv->read_buffer[1];
 230     payload_length = seat->priv->read_buffer[2] << 8 | seat->priv->read_buffer[3];
 231
 232     /* Read payload */
 233     if (seat->priv->read_buffer_n_used < 4 + payload_length)
 234         return TRUE;
 235     /*payload = seat->priv->read_buffer + 4;*/
 236
 237     switch (id)
 238     {
 239     case USC_MESSAGE_PING:
 240         g_debug ("PING!");
 241         write_message (seat, USC_MESSAGE_PONG, NULL, 0);
 242         break;
 243     case USC_MESSAGE_PONG:
 244         g_debug ("PONG!");
 245         break;
 246     case USC_MESSAGE_READY:
 247         g_debug ("READY");
 248         if (!seat->priv->compositor_ready)
 249         {
 250             seat->priv->compositor_ready = TRUE;
 251             g_debug ("Compositor ready");
 252             g_source_remove (seat->priv->compositor_timeout);
 253             seat->priv->compositor_timeout = 0;
 254             SEAT_CLASS (seat_unity_parent_class)->start (SEAT (seat));
 255         }
 256         break;
 257     case USC_MESSAGE_SESSION_CONNECTED:
 258         g_debug ("SESSION CONNECTED");
 259         break;
 260     default:
 261         g_warning ("Ingoring unknown message %d with %d octets from system compositor", id, payload_length);
 262         break;
 263     }
 264
 265     /* Clear buffer */
 266     seat->priv->read_buffer_n_used = 0;
 267
 268     return TRUE;
 269 }
 270
 271 static gchar *
 272 get_absolute_command (const gchar *command)
 273 {
 274     gchar **tokens;
 275     gchar *absolute_binary, *absolute_command = NULL;
 276
 277     tokens = g_strsplit (command, " ", 2);
 278
 279     absolute_binary = g_find_program_in_path (tokens[0]);
 280     if (absolute_binary)
 281     {
 282         if (tokens[1])
 283             absolute_command = g_strjoin (" ", absolute_binary, tokens[1], NULL);
 284         else
 285             absolute_command = g_strdup (absolute_binary);
 286         g_free (absolute_binary);
 287     }
 288     else
 289         absolute_command = g_strdup (command);
 290
 291     g_strfreev (tokens);
 292
 293     return absolute_command;
 294 }
 295
 296 static gboolean
 297 compositor_timeout_cb (gpointer data)
 298 {
 299     SeatUnity *seat = data;
 300
 301     /* Stop the compositor - it is not working */
 302     process_stop (seat->priv->compositor_process);
 303
 304     return TRUE;
 305 }
 306
 307 static gboolean
 308 seat_unity_start (Seat *seat)
 309 {
 310     const gchar *compositor_command;
 311     gchar *command, *absolute_command, *dir;
 312     gboolean result;
 313     int timeout;
 314
 315     /* Replace Plymouth if it is running */
 316     if (plymouth_get_is_active () && plymouth_has_active_vt ())
 317     {
 318         gint active_vt = vt_get_active ();
 319         if (active_vt >= vt_get_min ())
 320         {
 321             g_debug ("Compositor will replace Plymouth");
 322             SEAT_UNITY (seat)->priv->stopping_plymouth = TRUE;
 323             SEAT_UNITY (seat)->priv->vt = active_vt;
 324             plymouth_deactivate ();
 325         }
 326         else
 327             g_debug ("Plymouth is running on VT %d, but this is less than the configured minimum of %d so not replacing it", active_vt, vt_get_min ());
 328     }
 329     if (SEAT_UNITY (seat)->priv->vt < 0)
 330         SEAT_UNITY (seat)->priv->vt = vt_get_unused ();
 331     if (SEAT_UNITY (seat)->priv->vt < 0)
 332     {
 333         g_debug ("Failed to get a VT to run on");
 334         return FALSE;
 335     }
 336     vt_ref (SEAT_UNITY (seat)->priv->vt);
 337
 338     /* Create pipes to talk to compositor */
 339     if (pipe (SEAT_UNITY (seat)->priv->to_compositor_pipe) < 0 || pipe (SEAT_UNITY (seat)->priv->from_compositor_pipe) < 0)
 340     {
 341         g_debug ("Failed to create compositor pipes: %s", g_strerror (errno));
 342         return FALSE;
 343     }
 344
 345     /* Don't allow the daemon end of the pipes to be accessed in the compositor */
 346     fcntl (SEAT_UNITY (seat)->priv->to_compositor_pipe[1], F_SETFD, FD_CLOEXEC);
 347     fcntl (SEAT_UNITY (seat)->priv->from_compositor_pipe[0], F_SETFD, FD_CLOEXEC);
 348
 349     /* Listen for messages from the compositor */
 350     SEAT_UNITY (seat)->priv->from_compositor_channel = g_io_channel_unix_new (SEAT_UNITY (seat)->priv->from_compositor_pipe[0]);
 351     g_io_add_watch (SEAT_UNITY (seat)->priv->from_compositor_channel, G_IO_IN | G_IO_HUP, read_cb, seat);
 352
 353     /* Setup logging */
 354     dir = config_get_string (config_get_instance (), "LightDM", "log-directory");
 355     SEAT_UNITY (seat)->priv->log_file = g_build_filename (dir, "unity-system-compositor.log", NULL);
 356     g_debug ("Logging to %s", SEAT_UNITY (seat)->priv->log_file);
 357     g_free (dir);
 358
 359     SEAT_UNITY (seat)->priv->mir_socket_filename = g_strdup ("/tmp/mir_socket"); // FIXME: Use this socket by default as XMir is hardcoded to this
 360     timeout = seat_get_integer_property (seat, "unity-compositor-timeout");
 361     compositor_command = seat_get_string_property (seat, "unity-compositor-command");
 362     command = g_strdup_printf ("%s --from-dm-fd %d --to-dm-fd %d --vt %d", compositor_command, SEAT_UNITY (seat)->priv->to_compositor_pipe[0], SEAT_UNITY (seat)->priv->from_compositor_pipe[1], SEAT_UNITY (seat)->priv->vt);
 363
 364     absolute_command = get_absolute_command (command);
 365     g_free (command);
 366
 367     /* Start the compositor */
 368     process_set_command (SEAT_UNITY (seat)->priv->compositor_process, absolute_command);
 369     g_free (absolute_command);
 370     g_signal_connect (SEAT_UNITY (seat)->priv->compositor_process, "stopped", G_CALLBACK (compositor_stopped_cb), seat);
 371     g_signal_connect (SEAT_UNITY (seat)->priv->compositor_process, "run", G_CALLBACK (compositor_run_cb), seat);
 372     result = process_start (SEAT_UNITY (seat)->priv->compositor_process, FALSE);
 373
 374     /* Close compostor ends of the pipes */
 375     close (SEAT_UNITY (seat)->priv->to_compositor_pipe[0]);
 376     SEAT_UNITY (seat)->priv->to_compositor_pipe[0] = 0;
 377     close (SEAT_UNITY (seat)->priv->from_compositor_pipe[1]);
 378     SEAT_UNITY (seat)->priv->from_compositor_pipe[1] = 0;
 379
 380     if (!result)
 381         return FALSE;
 382
 383     /* Connect to the compositor */
 384     timeout = seat_get_integer_property (seat, "unity-compositor-timeout");
 385     if (timeout <= 0)
 386         timeout = 60;
 387     g_debug ("Waiting for system compositor for %ds", timeout);
 388     SEAT_UNITY (seat)->priv->compositor_timeout = g_timeout_add (timeout * 1000, compositor_timeout_cb, seat);
 389
 390     return TRUE;
 391 }
 392
 393 static DisplayServer *
 394 create_x_server (Seat *seat)
 395 {
 396     XServerLocal *xserver;
 397     const gchar *command = NULL, *layout = NULL, *config_file = NULL, *xdmcp_manager = NULL, *key_name = NULL;
 398     gboolean allow_tcp;
 399     gint port = 0;
 400     gchar *id;
 401
 402     g_debug ("Starting X server on Unity compositor");
 403
 404     xserver = xserver_local_new ();
 405
 406     if (!SEAT_UNITY (seat)->priv->use_vt_switching)
 407     {
 408         id = g_strdup_printf ("%d", SEAT_UNITY (seat)->priv->next_id);
 409         SEAT_UNITY (seat)->priv->next_id++;
 410         xserver_local_set_mir_id (xserver, id);
 411         xserver_local_set_mir_socket (xserver, SEAT_UNITY (seat)->priv->mir_socket_filename);
 412         g_free (id);
 413     }
 414
 415     command = seat_get_string_property (seat, "xserver-command");
 416     if (command)
 417         xserver_local_set_command (xserver, command);
 418
 419     layout = seat_get_string_property (seat, "xserver-layout");
 420     if (layout)
 421         xserver_local_set_layout (xserver, layout);
 422
 423     config_file = seat_get_string_property (seat, "xserver-config");
 424     if (config_file)
 425         xserver_local_set_config (xserver, config_file);
 426
 427     allow_tcp = seat_get_boolean_property (seat, "xserver-allow-tcp");
 428     xserver_local_set_allow_tcp (xserver, allow_tcp);
 429
 430     xdmcp_manager = seat_get_string_property (seat, "xdmcp-manager");
 431     if (xdmcp_manager)
 432         xserver_local_set_xdmcp_server (xserver, xdmcp_manager);
 433
 434     port = seat_get_integer_property (seat, "xdmcp-port");
 435     if (port > 0)
 436         xserver_local_set_xdmcp_port (xserver, port);
 437
 438     key_name = seat_get_string_property (seat, "xdmcp-key");
 439     if (key_name)
 440     {
 441         gchar *dir, *path;
 442         GKeyFile *keys;
 443         gboolean result;
 444         GError *error = NULL;
 445
 446         dir = config_get_string (config_get_instance (), "LightDM", "config-directory");
 447         path = g_build_filename (dir, "keys.conf", NULL);
 448         g_free (dir);
 449
 450         keys = g_key_file_new ();
 451         result = g_key_file_load_from_file (keys, path, G_KEY_FILE_NONE, &error);
 452         if (error)
 453             g_debug ("Error getting key %s", error->message);
 454         g_clear_error (&error);
 455
 456         if (result)
 457         {
 458             gchar *key = NULL;
 459
 460             if (g_key_file_has_key (keys, "keyring", key_name, NULL))
 461                 key = g_key_file_get_string (keys, "keyring", key_name, NULL);
 462             else
 463                 g_debug ("Key %s not defined", key_name);
 464
 465             if (key)
 466                 xserver_local_set_xdmcp_key (xserver, key);
 467             g_free (key);
 468         }
 469
 470         g_free (path);
 471         g_key_file_free (keys);
 472     }
 473
 474     return DISPLAY_SERVER (xserver);
 475 }
 476
 477 static DisplayServer *
 478 seat_unity_create_display_server (Seat *seat, const gchar *session_type)
 479 {
 480     if (strcmp (session_type, "x") == 0)
 481         return create_x_server (seat);
 482     else if (strcmp (session_type, "mir") == 0)
 483         return DISPLAY_SERVER (mir_server_new ());
 484     else
 485     {
 486         g_warning ("Can't create unsupported display server '%s'", session_type);
 487         return NULL;
 488     }
 489 }
 490
 491 static Greeter *
 492 seat_unity_create_greeter_session (Seat *seat)
 493 {
 494     XGreeter *greeter_session;
 495
 496     greeter_session = xgreeter_new ();
 497     session_set_env (SESSION (greeter_session), "XDG_SEAT", "seat0");
 498
 499     return GREETER (greeter_session);
 500 }
 501
 502 static Session *
 503 seat_unity_create_session (Seat *seat)
 504 {
 505     XSession *session;
 506
 507     session = xsession_new ();
 508     session_set_env (SESSION (session), "XDG_SEAT", "seat0");
 509
 510     return SESSION (session);
 511 }
 512
 513 static void
 514 seat_unity_set_active_session (Seat *seat, Session *session)
 515 {
 516     DisplayServer *display_server;
 517
 518     /* If no compositor, have to use VT switching */
 519     if (SEAT_UNITY (seat)->priv->use_vt_switching)
 520     {
 521         gint vt = display_server_get_vt (session_get_display_server (session));
 522         if (vt >= 0)
 523             vt_set_active (vt);
 524
 525         SEAT_CLASS (seat_unity_parent_class)->set_active_session (seat, session);
 526         return;
 527     }
 528
 529     if (session == SEAT_UNITY (seat)->priv->active_session)
 530         return;
 531     SEAT_UNITY (seat)->priv->active_session = g_object_ref (session);
 532
 533     display_server = session_get_display_server (session);
 534     if (SEAT_UNITY (seat)->priv->active_display_server != display_server)
 535     {
 536         const gchar *id;
 537
 538         SEAT_UNITY (seat)->priv->active_display_server = g_object_ref (display_server);
 539         id = xserver_local_get_mir_id (XSERVER_LOCAL (display_server));
 540
 541         g_debug ("Switching to Mir session %s", id);
 542         write_message (SEAT_UNITY (seat), USC_MESSAGE_SET_ACTIVE_SESSION, (const guint8 *) id, strlen (id));
 543     }
 544
 545     SEAT_CLASS (seat_unity_parent_class)->set_active_session (seat, session);
 546 }
 547
 548 static Session *
 549 seat_unity_get_active_session (Seat *seat)
 550 {
 551     if (SEAT_UNITY (seat)->priv->use_vt_switching)
 552     {
 553         gint vt;
 554         GList *link;
 555         vt = vt_get_active ();
 556         if (vt < 0)
 557             return NULL;
 558
 559         for (link = seat_get_sessions (seat); link; link = link->next)
 560         {
 561             Session *session = link->data;
 562             if (display_server_get_vt (session_get_display_server (session)) == vt)
 563                 return session;
 564         }
 565
 566         return NULL;
 567     }
 568
 569     return SEAT_UNITY (seat)->priv->active_session;
 570 }
 571
 572 static void
 573 seat_unity_run_script (Seat *seat, DisplayServer *display_server, Process *script)
 574 {
 575     const gchar *path;
 576     XServerLocal *xserver;
 577
 578     xserver = XSERVER_LOCAL (display_server);
 579     path = xserver_local_get_authority_file_path (xserver);
 580     process_set_env (script, "DISPLAY", xserver_get_address (XSERVER (xserver)));
 581     process_set_env (script, "XAUTHORITY", path);
 582
 583     SEAT_CLASS (seat_unity_parent_class)->run_script (seat, display_server, script);
 584 }
 585
 586 static void
 587 seat_unity_stop (Seat *seat)
 588 {
 589     /* Stop the compositor first */
 590     if (process_get_is_running (SEAT_UNITY (seat)->priv->compositor_process))
 591     {
 592         process_stop (SEAT_UNITY (seat)->priv->compositor_process);
 593         return;
 594     }
 595
 596     SEAT_CLASS (seat_unity_parent_class)->stop (seat);
 597 }
 598
 599 static void
 600 seat_unity_init (SeatUnity *seat)
 601 {
 602     seat->priv = G_TYPE_INSTANCE_GET_PRIVATE (seat, SEAT_UNITY_TYPE, SeatUnityPrivate);
 603     seat->priv->vt = -1;
 604     seat->priv->compositor_process = process_new ();
 605 }
 606
 607 static void
 608 seat_unity_finalize (GObject *object)
 609 {
 610     SeatUnity *seat = SEAT_UNITY (object);
 611
 612     if (seat->priv->vt >= 0)
 613         vt_unref (seat->priv->vt);
 614     g_free (seat->priv->log_file);
 615     g_free (seat->priv->mir_socket_filename);
 616     close (seat->priv->to_compositor_pipe[0]);
 617     close (seat->priv->to_compositor_pipe[1]);
 618     close (seat->priv->from_compositor_pipe[0]);
 619     close (seat->priv->from_compositor_pipe[1]);
 620     g_io_channel_unref (seat->priv->from_compositor_channel);
 621     g_free (seat->priv->read_buffer);
 622     g_object_unref (seat->priv->compositor_process);
 623     if (seat->priv->active_session)
 624         g_object_unref (seat->priv->active_session);
 625     if (seat->priv->active_display_server)
 626         g_object_unref (seat->priv->active_display_server);
 627
 628     G_OBJECT_CLASS (seat_unity_parent_class)->finalize (object);
 629 }
 630
 631 static void
 632 seat_unity_class_init (SeatUnityClass *klass)
 633 {
 634     GObjectClass *object_class = G_OBJECT_CLASS (klass);
 635     SeatClass *seat_class = SEAT_CLASS (klass);
 636
 637     object_class->finalize = seat_unity_finalize;
 638     seat_class->setup = seat_unity_setup;
 639     seat_class->start = seat_unity_start;
 640     seat_class->create_display_server = seat_unity_create_display_server;
 641     seat_class->create_greeter_session = seat_unity_create_greeter_session;
 642     seat_class->create_session = seat_unity_create_session;
 643     seat_class->set_active_session = seat_unity_set_active_session;
 644     seat_class->get_active_session = seat_unity_get_active_session;
 645     seat_class->run_script = seat_unity_run_script;
 646     seat_class->stop = seat_unity_stop;
 647
 648     g_type_class_add_private (klass, sizeof (SeatUnityPrivate));
 649 }