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 "x-server-local.h"
  20 #include "mir-server.h"
  21 #include "vt.h"
  22 #include "plymouth.h"
  23
  24 typedef enum
  25 {
  26    USC_MESSAGE_PING = 0,
  27    USC_MESSAGE_PONG = 1,
  28    USC_MESSAGE_READY = 2,
  29    USC_MESSAGE_SESSION_CONNECTED = 3,
  30    USC_MESSAGE_SET_ACTIVE_SESSION = 4
  31 } USCMessageID;
  32
  33 struct SeatUnityPrivate
  34 {
  35     /* VT we are running on */
  36     gint vt;
  37
  38     /* File to log to */
  39     gchar *log_file;
  40
  41     /* Filename of Mir socket */
  42     gchar *mir_socket_filename;
  43
  44     /* Pipes to communicate with compositor */
  45     int to_compositor_pipe[2];
  46     int from_compositor_pipe[2];
  47
  48     /* IO channel listening on for messages from the compositor */
  49     GIOChannel *from_compositor_channel;
  50
  51     /* TRUE when the compositor indicates it is ready */
  52     gboolean compositor_ready;
  53
  54     /* Buffer reading from channel */
  55     guint8 *read_buffer;
  56     gsize read_buffer_length;
  57     gsize read_buffer_n_used;
  58
  59     /* Compositor process */
  60     Process *compositor_process;
  61
  62     /* Timeout when waiting for compositor to start */
  63     guint compositor_timeout;
  64
  65     /* Next Mir ID to use for a compositor client */
  66     gint next_id;
  67
  68     /* TRUE if using VT switching fallback */
  69     gboolean use_vt_switching;
  70
  71     /* The currently visible session */
  72     Session *active_session;
  73     DisplayServer *active_display_server;
  74 };
  75
  76 G_DEFINE_TYPE (SeatUnity, seat_unity, SEAT_TYPE);
  77
  78 static gboolean
  79 seat_unity_get_start_local_sessions (Seat *seat)
  80 {
  81     return !seat_get_string_property (seat, "xdmcp-manager");
  82 }
  83
  84 static void
  85 seat_unity_setup (Seat *seat)
  86 {
  87     seat_set_can_switch (seat, TRUE);
  88     SEAT_CLASS (seat_unity_parent_class)->setup (seat);
  89 }
  90
  91 static void
  92 compositor_stopped_cb (Process *process, SeatUnity *seat)
  93 {
  94     if (seat->priv->compositor_timeout != 0)
  95         g_source_remove (seat->priv->compositor_timeout);
  96     seat->priv->compositor_timeout = 0;
  97
  98     /* Finished with the VT */
  99     vt_unref (seat->priv->vt);
 100     seat->priv->vt = -1;
 101
 102     if (seat_get_is_stopping (SEAT (seat)))
 103     {
 104         SEAT_CLASS (seat_unity_parent_class)->stop (SEAT (seat));
 105         return;
 106     }
 107
 108     /* If stopped before it was ready, then revert to VT mode */
 109     if (!seat->priv->compositor_ready)
 110     {
 111         l_debug (seat, "Compositor failed to start, switching to VT mode");
 112         seat->priv->use_vt_switching = TRUE;
 113         SEAT_CLASS (seat_unity_parent_class)->start (SEAT (seat));
 114         return;
 115     }
 116
 117     l_debug (seat, "Stopping Unity seat, compositor terminated");
 118
 119     seat_stop (SEAT (seat));
 120 }
 121
 122 static void
 123 compositor_run_cb (Process *process, SeatUnity *seat)
 124 {
 125     int fd;
 126
 127     /* Make input non-blocking */
 128     fd = open ("/dev/null", O_RDONLY);
 129     dup2 (fd, STDIN_FILENO);
 130     close (fd);
 131
 132     /* Redirect output to logfile */
 133     if (seat->priv->log_file)
 134     {
 135          int fd;
 136          gchar *old_filename;
 137
 138          /* Move old file out of the way */
 139          old_filename = g_strdup_printf ("%s.old", seat->priv->log_file);
 140          rename (seat->priv->log_file, old_filename);
 141          g_free (old_filename);
 142
 143          /* Create new file and log to it */
 144          fd = g_open (seat->priv->log_file, O_WRONLY | O_CREAT | O_TRUNC, 0600);
 145          if (fd < 0)
 146              l_warning (seat, "Failed to open log file %s: %s", seat->priv->log_file, g_strerror (errno));
 147          else
 148          {
 149              dup2 (fd, STDOUT_FILENO);
 150              dup2 (fd, STDERR_FILENO);
 151              close (fd);
 152          }
 153     }
 154 }
 155
 156 static void
 157 write_message (SeatUnity *seat, guint16 id, const guint8 *payload, guint16 payload_length)
 158 {
 159     guint8 *data;
 160     gsize data_length = 4 + payload_length;
 161
 162     data = g_malloc (data_length);
 163     data[0] = id >> 8;
 164     data[1] = id & 0xFF;
 165     data[2] = payload_length >> 8;
 166     data[3] = payload_length & 0xFF;
 167     memcpy (data + 4, payload, payload_length);
 168
 169     errno = 0;
 170     if (write (seat->priv->to_compositor_pipe[1], data, data_length) != data_length)
 171         l_warning (seat, "Failed to write to compositor: %s", strerror (errno));
 172 }
 173
 174 static gboolean
 175 read_cb (GIOChannel *source, GIOCondition condition, gpointer data)
 176 {
 177     SeatUnity *seat = data;
 178     gsize n_to_read = 0;
 179     guint16 id, payload_length;
 180     /*guint8 *payload;*/
 181
 182     if (condition == G_IO_HUP)
 183     {
 184         l_debug (seat, "Compositor closed communication channel");
 185         return FALSE;
 186     }
 187
 188     /* Work out how much required for a message */
 189     if (seat->priv->read_buffer_n_used < 4)
 190         n_to_read = 4 - seat->priv->read_buffer_n_used;
 191     else
 192     {
 193         payload_length = seat->priv->read_buffer[2] << 8 | seat->priv->read_buffer[3];
 194         n_to_read = 4 + payload_length - seat->priv->read_buffer_n_used;
 195     }
 196
 197     /* Read from compositor */
 198     if (n_to_read > 0)
 199     {
 200         gsize n_total, n_read = 0;
 201         GIOStatus status;
 202         GError *error = NULL;
 203
 204         n_total = seat->priv->read_buffer_n_used + n_to_read;
 205         if (seat->priv->read_buffer_length < n_total)
 206             seat->priv->read_buffer = g_realloc (seat->priv->read_buffer, n_total);
 207
 208         status = g_io_channel_read_chars (source,
 209                                           (gchar *)seat->priv->read_buffer + seat->priv->read_buffer_n_used,
 210                                           n_to_read,
 211                                           &n_read,
 212                                           &error);
 213         if (error)
 214             l_warning (seat, "Failed to read from compositor: %s", error->message);
 215         if (status != G_IO_STATUS_NORMAL)
 216             return TRUE;
 217         g_clear_error (&error);
 218         seat->priv->read_buffer_n_used += n_read;
 219     }
 220
 221     /* Read header */
 222     if (seat->priv->read_buffer_n_used < 4)
 223          return TRUE;
 224     id = seat->priv->read_buffer[0] << 8 | seat->priv->read_buffer[1];
 225     payload_length = seat->priv->read_buffer[2] << 8 | seat->priv->read_buffer[3];
 226
 227     /* Read payload */
 228     if (seat->priv->read_buffer_n_used < 4 + payload_length)
 229         return TRUE;
 230     /*payload = seat->priv->read_buffer + 4;*/
 231
 232     switch (id)
 233     {
 234     case USC_MESSAGE_PING:
 235         l_debug (seat, "PING!");
 236         write_message (seat, USC_MESSAGE_PONG, NULL, 0);
 237         break;
 238     case USC_MESSAGE_PONG:
 239         l_debug (seat, "PONG!");
 240         break;
 241     case USC_MESSAGE_READY:
 242         l_debug (seat, "READY");
 243         if (!seat->priv->compositor_ready)
 244         {
 245             seat->priv->compositor_ready = TRUE;
 246             l_debug (seat, "Compositor ready");
 247             g_source_remove (seat->priv->compositor_timeout);
 248             seat->priv->compositor_timeout = 0;
 249             SEAT_CLASS (seat_unity_parent_class)->start (SEAT (seat));
 250         }
 251         break;
 252     case USC_MESSAGE_SESSION_CONNECTED:
 253         l_debug (seat, "SESSION CONNECTED");
 254         break;
 255     default:
 256         l_warning (seat, "Ignoring unknown message %d with %d octets from system compositor", id, payload_length);
 257         break;
 258     }
 259
 260     /* Clear buffer */
 261     seat->priv->read_buffer_n_used = 0;
 262
 263     return TRUE;
 264 }
 265
 266 static gchar *
 267 get_absolute_command (const gchar *command)
 268 {
 269     gchar **tokens;
 270     gchar *absolute_binary, *absolute_command = NULL;
 271
 272     tokens = g_strsplit (command, " ", 2);
 273
 274     absolute_binary = g_find_program_in_path (tokens[0]);
 275     if (absolute_binary)
 276     {
 277         if (tokens[1])
 278             absolute_command = g_strjoin (" ", absolute_binary, tokens[1], NULL);
 279         else
 280             absolute_command = g_strdup (absolute_binary);
 281         g_free (absolute_binary);
 282     }
 283     else
 284         absolute_command = g_strdup (command);
 285
 286     g_strfreev (tokens);
 287
 288     return absolute_command;
 289 }
 290
 291 static gboolean
 292 compositor_timeout_cb (gpointer data)
 293 {
 294     SeatUnity *seat = data;
 295
 296     /* Stop the compositor - it is not working */
 297     process_stop (seat->priv->compositor_process);
 298
 299     return TRUE;
 300 }
 301
 302 static gboolean
 303 seat_unity_start (Seat *seat)
 304 {
 305     const gchar *compositor_command;
 306     gchar *command, *absolute_command, *dir;
 307     gboolean result;
 308     int timeout;
 309
 310     /* Replace Plymouth if it is running */
 311     if (plymouth_get_is_active () && plymouth_has_active_vt ())
 312     {
 313         gint active_vt = vt_get_active ();
 314         if (active_vt >= vt_get_min ())
 315         {
 316             SEAT_UNITY (seat)->priv->vt = active_vt;
 317             plymouth_quit (TRUE);
 318         }
 319         else
 320             l_debug (seat, "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 ());
 321     }
 322     if (plymouth_get_is_active ())
 323         plymouth_quit (FALSE);
 324     if (SEAT_UNITY (seat)->priv->vt < 0)
 325         SEAT_UNITY (seat)->priv->vt = vt_get_unused ();
 326     if (SEAT_UNITY (seat)->priv->vt < 0)
 327     {
 328         l_debug (seat, "Failed to get a VT to run on");
 329         return FALSE;
 330     }
 331     vt_ref (SEAT_UNITY (seat)->priv->vt);
 332
 333     /* Create pipes to talk to compositor */
 334     if (pipe (SEAT_UNITY (seat)->priv->to_compositor_pipe) < 0 || pipe (SEAT_UNITY (seat)->priv->from_compositor_pipe) < 0)
 335     {
 336         l_debug (seat, "Failed to create compositor pipes: %s", g_strerror (errno));
 337         return FALSE;
 338     }
 339
 340     /* Don't allow the daemon end of the pipes to be accessed in the compositor */
 341     fcntl (SEAT_UNITY (seat)->priv->to_compositor_pipe[1], F_SETFD, FD_CLOEXEC);
 342     fcntl (SEAT_UNITY (seat)->priv->from_compositor_pipe[0], F_SETFD, FD_CLOEXEC);
 343
 344     /* Listen for messages from the compositor */
 345     SEAT_UNITY (seat)->priv->from_compositor_channel = g_io_channel_unix_new (SEAT_UNITY (seat)->priv->from_compositor_pipe[0]);
 346     g_io_add_watch (SEAT_UNITY (seat)->priv->from_compositor_channel, G_IO_IN | G_IO_HUP, read_cb, seat);
 347
 348     /* Setup logging */
 349     dir = config_get_string (config_get_instance (), "LightDM", "log-directory");
 350     SEAT_UNITY (seat)->priv->log_file = g_build_filename (dir, "unity-system-compositor.log", NULL);
 351     l_debug (seat, "Logging to %s", SEAT_UNITY (seat)->priv->log_file);
 352     g_free (dir);
 353
 354     SEAT_UNITY (seat)->priv->mir_socket_filename = g_strdup ("/tmp/mir_socket"); // FIXME: Use this socket by default as XMir is hardcoded to this
 355     timeout = seat_get_integer_property (seat, "unity-compositor-timeout");
 356     compositor_command = seat_get_string_property (seat, "unity-compositor-command");
 357     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);
 358
 359     absolute_command = get_absolute_command (command);
 360     g_free (command);
 361
 362     /* Start the compositor */
 363     process_set_command (SEAT_UNITY (seat)->priv->compositor_process, absolute_command);
 364     g_free (absolute_command);
 365     g_signal_connect (SEAT_UNITY (seat)->priv->compositor_process, "stopped", G_CALLBACK (compositor_stopped_cb), seat);
 366     g_signal_connect (SEAT_UNITY (seat)->priv->compositor_process, "run", G_CALLBACK (compositor_run_cb), seat);
 367     result = process_start (SEAT_UNITY (seat)->priv->compositor_process, FALSE);
 368
 369     /* Close compostor ends of the pipes */
 370     close (SEAT_UNITY (seat)->priv->to_compositor_pipe[0]);
 371     SEAT_UNITY (seat)->priv->to_compositor_pipe[0] = 0;
 372     close (SEAT_UNITY (seat)->priv->from_compositor_pipe[1]);
 373     SEAT_UNITY (seat)->priv->from_compositor_pipe[1] = 0;
 374
 375     if (!result)
 376         return FALSE;
 377
 378     /* Connect to the compositor */
 379     timeout = seat_get_integer_property (seat, "unity-compositor-timeout");
 380     if (timeout <= 0)
 381         timeout = 60;
 382     l_debug (seat, "Waiting for system compositor for %ds", timeout);
 383     SEAT_UNITY (seat)->priv->compositor_timeout = g_timeout_add (timeout * 1000, compositor_timeout_cb, seat);
 384
 385     return TRUE;
 386 }
 387
 388 static DisplayServer *
 389 create_x_server (Seat *seat)
 390 {
 391     XServerLocal *x_server;
 392     const gchar *command = NULL, *layout = NULL, *config_file = NULL, *xdmcp_manager = NULL, *key_name = NULL;
 393     gboolean allow_tcp;
 394     gint port = 0;
 395
 396     l_debug (seat, "Starting X server on Unity compositor");
 397
 398     x_server = x_server_local_new ();
 399
 400     command = seat_get_string_property (seat, "xserver-command");
 401     if (command)
 402         x_server_local_set_command (x_server, command);
 403
 404     if (SEAT_UNITY (seat)->priv->use_vt_switching)
 405         x_server_local_set_vt (x_server, vt_get_unused ());
 406     else
 407     {
 408         gchar *id;
 409
 410         id = g_strdup_printf ("%d", SEAT_UNITY (seat)->priv->next_id);
 411         SEAT_UNITY (seat)->priv->next_id++;
 412         x_server_local_set_mir_id (x_server, id);
 413         x_server_local_set_mir_socket (x_server, SEAT_UNITY (seat)->priv->mir_socket_filename);
 414         g_free (id);
 415     }
 416
 417     layout = seat_get_string_property (seat, "xserver-layout");
 418     if (layout)
 419         x_server_local_set_layout (x_server, layout);
 420
 421     config_file = seat_get_string_property (seat, "xserver-config");
 422     if (config_file)
 423         x_server_local_set_config (x_server, config_file);
 424
 425     allow_tcp = seat_get_boolean_property (seat, "xserver-allow-tcp");
 426     x_server_local_set_allow_tcp (x_server, allow_tcp);
 427
 428     xdmcp_manager = seat_get_string_property (seat, "xdmcp-manager");
 429     if (xdmcp_manager)
 430         x_server_local_set_xdmcp_server (x_server, xdmcp_manager);
 431
 432     port = seat_get_integer_property (seat, "xdmcp-port");
 433     if (port > 0)
 434         x_server_local_set_xdmcp_port (x_server, port);
 435
 436     key_name = seat_get_string_property (seat, "xdmcp-key");
 437     if (key_name)
 438     {
 439         gchar *dir, *path;
 440         GKeyFile *keys;
 441         gboolean result;
 442         GError *error = NULL;
 443
 444         dir = config_get_string (config_get_instance (), "LightDM", "config-directory");
 445         path = g_build_filename (dir, "keys.conf", NULL);
 446         g_free (dir);
 447
 448         keys = g_key_file_new ();
 449         result = g_key_file_load_from_file (keys, path, G_KEY_FILE_NONE, &error);
 450         if (error)
 451             l_debug (seat, "Error getting key %s", error->message);
 452         g_clear_error (&error);
 453
 454         if (result)
 455         {
 456             gchar *key = NULL;
 457
 458             if (g_key_file_has_key (keys, "keyring", key_name, NULL))
 459                 key = g_key_file_get_string (keys, "keyring", key_name, NULL);
 460             else
 461                 l_debug (seat, "Key %s not defined", key_name);
 462
 463             if (key)
 464                 x_server_local_set_xdmcp_key (x_server, key);
 465             g_free (key);
 466         }
 467
 468         g_free (path);
 469         g_key_file_free (keys);
 470     }
 471
 472     return DISPLAY_SERVER (x_server);
 473 }
 474
 475 static DisplayServer *
 476 create_mir_server (Seat *seat)
 477 {
 478     MirServer *mir_server;
 479
 480     mir_server = mir_server_new ();
 481     mir_server_set_parent_socket (mir_server, SEAT_UNITY (seat)->priv->mir_socket_filename);
 482
 483     if (SEAT_UNITY (seat)->priv->use_vt_switching)
 484         mir_server_set_vt (mir_server, vt_get_unused ());
 485     else
 486     {
 487         gchar *id;
 488
 489         id = g_strdup_printf ("%d", SEAT_UNITY (seat)->priv->next_id);
 490         SEAT_UNITY (seat)->priv->next_id++;
 491         mir_server_set_id (mir_server, id);
 492         mir_server_set_parent_socket (mir_server, SEAT_UNITY (seat)->priv->mir_socket_filename);
 493         g_free (id);
 494     }
 495
 496     return DISPLAY_SERVER (mir_server);
 497 }
 498
 499 static DisplayServer *
 500 seat_unity_create_display_server (Seat *seat, const gchar *session_type)
 501 {
 502     if (strcmp (session_type, "x") == 0)
 503         return create_x_server (seat);
 504     else if (strcmp (session_type, "mir") == 0)
 505         return create_mir_server (seat);
 506     else
 507     {
 508         l_warning (seat, "Can't create unsupported display server '%s'", session_type);
 509         return NULL;
 510     }
 511 }
 512
 513 static Greeter *
 514 seat_unity_create_greeter_session (Seat *seat)
 515 {
 516     Greeter *greeter_session;
 517     const gchar *xdg_seat;
 518
 519     greeter_session = SEAT_CLASS (seat_unity_parent_class)->create_greeter_session (seat);
 520     xdg_seat = "seat0";
 521     l_debug (seat, "Setting XDG_SEAT=%s", xdg_seat);
 522     session_set_env (SESSION (greeter_session), "XDG_SEAT", xdg_seat);
 523     if (!SEAT_UNITY (seat)->priv->use_vt_switching)
 524     {
 525         gchar *value = g_strdup_printf ("%d", SEAT_UNITY (seat)->priv->vt);
 526         l_debug (seat, "Setting XDG_VTNR=%s", value);
 527         session_set_env (SESSION (greeter_session), "XDG_VTNR", value);
 528         g_free (value);
 529     }
 530     else
 531         l_debug (seat, "Not setting XDG_VTNR");
 532
 533     return greeter_session;
 534 }
 535
 536 static Session *
 537 seat_unity_create_session (Seat *seat)
 538 {
 539     Session *session;
 540     const gchar *xdg_seat;
 541
 542     session = SEAT_CLASS (seat_unity_parent_class)->create_session (seat);
 543     xdg_seat = "seat0";
 544     l_debug (seat, "Setting XDG_SEAT=%s", xdg_seat);
 545     session_set_env (session, "XDG_SEAT", xdg_seat);
 546     if (!SEAT_UNITY (seat)->priv->use_vt_switching)
 547     {
 548         gchar *value = g_strdup_printf ("%d", SEAT_UNITY (seat)->priv->vt);
 549         l_debug (seat, "Setting XDG_VTNR=%s", value);
 550         session_set_env (SESSION (session), "XDG_VTNR", value);
 551         g_free (value);
 552     }
 553     else
 554         l_debug (seat, "Not setting XDG_VTNR");
 555
 556     return session;
 557 }
 558
 559 static void
 560 seat_unity_set_active_session (Seat *seat, Session *session)
 561 {
 562     DisplayServer *display_server;
 563
 564     /* If no compositor, have to use VT switching */
 565     if (SEAT_UNITY (seat)->priv->use_vt_switching)
 566     {
 567         gint vt = display_server_get_vt (session_get_display_server (session));
 568         if (vt >= 0)
 569             vt_set_active (vt);
 570
 571         SEAT_CLASS (seat_unity_parent_class)->set_active_session (seat, session);
 572         return;
 573     }
 574
 575     if (session == SEAT_UNITY (seat)->priv->active_session)
 576         return;
 577     SEAT_UNITY (seat)->priv->active_session = g_object_ref (session);
 578
 579     display_server = session_get_display_server (session);
 580     if (SEAT_UNITY (seat)->priv->active_display_server != display_server)
 581     {
 582         const gchar *id = NULL;
 583
 584         SEAT_UNITY (seat)->priv->active_display_server = g_object_ref (display_server);
 585
 586         if (IS_X_SERVER_LOCAL (display_server))
 587             id = x_server_local_get_mir_id (X_SERVER_LOCAL (display_server));
 588         else if (IS_MIR_SERVER (display_server))
 589             id = mir_server_get_id (MIR_SERVER (display_server));
 590
 591         if (id)
 592         {
 593             l_debug (seat, "Switching to Mir session %s", id);
 594             write_message (SEAT_UNITY (seat), USC_MESSAGE_SET_ACTIVE_SESSION, (const guint8 *) id, strlen (id));
 595         }
 596         else
 597             l_warning (seat, "Failed to work out session ID");
 598     }
 599
 600     SEAT_CLASS (seat_unity_parent_class)->set_active_session (seat, session);
 601 }
 602
 603 static Session *
 604 seat_unity_get_active_session (Seat *seat)
 605 {
 606     if (SEAT_UNITY (seat)->priv->use_vt_switching)
 607     {
 608         gint vt;
 609         GList *link;
 610         vt = vt_get_active ();
 611         if (vt < 0)
 612             return NULL;
 613
 614         for (link = seat_get_sessions (seat); link; link = link->next)
 615         {
 616             Session *session = link->data;
 617             if (display_server_get_vt (session_get_display_server (session)) == vt)
 618                 return session;
 619         }
 620
 621         return NULL;
 622     }
 623
 624     return SEAT_UNITY (seat)->priv->active_session;
 625 }
 626
 627 static void
 628 seat_unity_run_script (Seat *seat, DisplayServer *display_server, Process *script)
 629 {
 630     const gchar *path;
 631     XServerLocal *x_server;
 632
 633     x_server = X_SERVER_LOCAL (display_server);
 634     path = x_server_local_get_authority_file_path (x_server);
 635     process_set_env (script, "DISPLAY", x_server_get_address (X_SERVER (x_server)));
 636     process_set_env (script, "XAUTHORITY", path);
 637
 638     SEAT_CLASS (seat_unity_parent_class)->run_script (seat, display_server, script);
 639 }
 640
 641 static void
 642 seat_unity_stop (Seat *seat)
 643 {
 644     /* Stop the compositor first */
 645     if (process_get_is_running (SEAT_UNITY (seat)->priv->compositor_process))
 646     {
 647         process_stop (SEAT_UNITY (seat)->priv->compositor_process);
 648         return;
 649     }
 650
 651     SEAT_CLASS (seat_unity_parent_class)->stop (seat);
 652 }
 653
 654 static void
 655 seat_unity_init (SeatUnity *seat)
 656 {
 657     seat->priv = G_TYPE_INSTANCE_GET_PRIVATE (seat, SEAT_UNITY_TYPE, SeatUnityPrivate);
 658     seat->priv->vt = -1;
 659     seat->priv->compositor_process = process_new ();
 660 }
 661
 662 static void
 663 seat_unity_finalize (GObject *object)
 664 {
 665     SeatUnity *seat = SEAT_UNITY (object);
 666
 667     if (seat->priv->vt >= 0)
 668         vt_unref (seat->priv->vt);
 669     g_free (seat->priv->log_file);
 670     g_free (seat->priv->mir_socket_filename);
 671     close (seat->priv->to_compositor_pipe[0]);
 672     close (seat->priv->to_compositor_pipe[1]);
 673     close (seat->priv->from_compositor_pipe[0]);
 674     close (seat->priv->from_compositor_pipe[1]);
 675     g_io_channel_unref (seat->priv->from_compositor_channel);
 676     g_free (seat->priv->read_buffer);
 677     g_object_unref (seat->priv->compositor_process);
 678     if (seat->priv->active_session)
 679         g_object_unref (seat->priv->active_session);
 680     if (seat->priv->active_display_server)
 681         g_object_unref (seat->priv->active_display_server);
 682
 683     G_OBJECT_CLASS (seat_unity_parent_class)->finalize (object);
 684 }
 685
 686 static void
 687 seat_unity_class_init (SeatUnityClass *klass)
 688 {
 689     GObjectClass *object_class = G_OBJECT_CLASS (klass);
 690     SeatClass *seat_class = SEAT_CLASS (klass);
 691
 692     object_class->finalize = seat_unity_finalize;
 693     seat_class->get_start_local_sessions = seat_unity_get_start_local_sessions;
 694     seat_class->setup = seat_unity_setup;
 695     seat_class->start = seat_unity_start;
 696     seat_class->create_display_server = seat_unity_create_display_server;
 697     seat_class->create_greeter_session = seat_unity_create_greeter_session;
 698     seat_class->create_session = seat_unity_create_session;
 699     seat_class->set_active_session = seat_unity_set_active_session;
 700     seat_class->get_active_session = seat_unity_get_active_session;
 701     seat_class->run_script = seat_unity_run_script;
 702     seat_class->stop = seat_unity_stop;
 703
 704     g_type_class_add_private (klass, sizeof (SeatUnityPrivate));
 705 }