gio/gdbusprivate.c

   1 /* GDBus - GLib D-Bus Library
   2  *
   3  * Copyright (C) 2008-2010 Red Hat, Inc.
   4  *
   5  * This library is free software; you can redistribute it and/or
   6  * modify it under the terms of the GNU Lesser General Public
   7  * License as published by the Free Software Foundation; either
   8  * version 2 of the License, or (at your option) any later version.
   9  *
  10  * This library is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13  * Lesser General Public License for more details.
  14  *
  15  * You should have received a copy of the GNU Lesser General
  16  * Public License along with this library; if not, write to the
  17  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
  18  * Boston, MA 02111-1307, USA.
  19  *
  20  * Author: David Zeuthen <davidz@redhat.com>
  21  */
  22
  23 #include "config.h"
  24
  25 #include <stdlib.h>
  26 #include <string.h>
  27 #ifdef HAVE_UNISTD_H
  28 #include <unistd.h>
  29 #endif
  30
  31 #include "giotypes.h"
  32 #include "gsocket.h"
  33 #include "gdbusprivate.h"
  34 #include "gdbusmessage.h"
  35 #include "gdbuserror.h"
  36 #include "gdbusintrospection.h"
  37 #include "gasyncresult.h"
  38 #include "gsimpleasyncresult.h"
  39 #include "ginputstream.h"
  40 #include "gmemoryinputstream.h"
  41 #include "giostream.h"
  42 #include "gsocketcontrolmessage.h"
  43 #include "gsocketconnection.h"
  44 #include "gsocketoutputstream.h"
  45
  46 #ifdef G_OS_UNIX
  47 #include "gunixfdmessage.h"
  48 #include "gunixconnection.h"
  49 #include "gunixcredentialsmessage.h"
  50 #endif
  51
  52 #ifdef G_OS_WIN32
  53 #include <windows.h>
  54 #endif
  55
  56 #include "glibintl.h"
  57
  58 static gboolean _g_dbus_worker_do_initial_read (gpointer data);
  59
  60 /* ---------------------------------------------------------------------------------------------------- */
  61
  62 gchar *
  63 _g_dbus_hexdump (const gchar *data, gsize len, guint indent)
  64 {
  65  guint n, m;
  66  GString *ret;
  67
  68  ret = g_string_new (NULL);
  69
  70  for (n = 0; n < len; n += 16)
  71    {
  72      g_string_append_printf (ret, "%*s%04x: ", indent, "", n);
  73
  74      for (m = n; m < n + 16; m++)
  75        {
  76          if (m > n && (m%4) == 0)
  77            g_string_append_c (ret, ' ');
  78          if (m < len)
  79            g_string_append_printf (ret, "%02x ", (guchar) data[m]);
  80          else
  81            g_string_append (ret, "   ");
  82        }
  83
  84      g_string_append (ret, "   ");
  85
  86      for (m = n; m < len && m < n + 16; m++)
  87        g_string_append_c (ret, g_ascii_isprint (data[m]) ? data[m] : '.');
  88
  89      g_string_append_c (ret, '\n');
  90    }
  91
  92  return g_string_free (ret, FALSE);
  93 }
  94
  95 /* ---------------------------------------------------------------------------------------------------- */
  96
  97 /* Unfortunately ancillary messages are discarded when reading from a
  98  * socket using the GSocketInputStream abstraction. So we provide a
  99  * very GInputStream-ish API that uses GSocket in this case (very
 100  * similar to GSocketInputStream).
 101  */
 102
 103 typedef struct
 104 {
 105   GSocket *socket;
 106   GCancellable *cancellable;
 107
 108   void *buffer;
 109   gsize count;
 110
 111   GSocketControlMessage ***messages;
 112   gint *num_messages;
 113
 114   GSimpleAsyncResult *simple;
 115
 116   gboolean from_mainloop;
 117 } ReadWithControlData;
 118
 119 static void
 120 read_with_control_data_free (ReadWithControlData *data)
 121 {
 122   g_object_unref (data->socket);
 123   if (data->cancellable != NULL)
 124     g_object_unref (data->cancellable);
 125   g_object_unref (data->simple);
 126   g_free (data);
 127 }
 128
 129 static gboolean
 130 _g_socket_read_with_control_messages_ready (GSocket      *socket,
 131                                             GIOCondition  condition,
 132                                             gpointer      user_data)
 133 {
 134   ReadWithControlData *data = user_data;
 135   GError *error;
 136   gssize result;
 137   GInputVector vector;
 138
 139   error = NULL;
 140   vector.buffer = data->buffer;
 141   vector.size = data->count;
 142   result = g_socket_receive_message (data->socket,
 143                                      NULL, /* address */
 144                                      &vector,
 145                                      1,
 146                                      data->messages,
 147                                      data->num_messages,
 148                                      NULL,
 149                                      data->cancellable,
 150                                      &error);
 151   if (result >= 0)
 152     {
 153       g_simple_async_result_set_op_res_gssize (data->simple, result);
 154     }
 155   else
 156     {
 157       g_assert (error != NULL);
 158       g_simple_async_result_take_error (data->simple, error);
 159     }
 160
 161   if (data->from_mainloop)
 162     g_simple_async_result_complete (data->simple);
 163   else
 164     g_simple_async_result_complete_in_idle (data->simple);
 165
 166   return FALSE;
 167 }
 168
 169 static void
 170 _g_socket_read_with_control_messages (GSocket                 *socket,
 171                                       void                    *buffer,
 172                                       gsize                    count,
 173                                       GSocketControlMessage ***messages,
 174                                       gint                    *num_messages,
 175                                       gint                     io_priority,
 176                                       GCancellable            *cancellable,
 177                                       GAsyncReadyCallback      callback,
 178                                       gpointer                 user_data)
 179 {
 180   ReadWithControlData *data;
 181
 182   data = g_new0 (ReadWithControlData, 1);
 183   data->socket = g_object_ref (socket);
 184   data->cancellable = cancellable != NULL ? g_object_ref (cancellable) : NULL;
 185   data->buffer = buffer;
 186   data->count = count;
 187   data->messages = messages;
 188   data->num_messages = num_messages;
 189
 190   data->simple = g_simple_async_result_new (G_OBJECT (socket),
 191                                             callback,
 192                                             user_data,
 193                                             _g_socket_read_with_control_messages);
 194
 195   if (!g_socket_condition_check (socket, G_IO_IN))
 196     {
 197       GSource *source;
 198       data->from_mainloop = TRUE;
 199       source = g_socket_create_source (data->socket,
 200                                        G_IO_IN | G_IO_HUP | G_IO_ERR,
 201                                        cancellable);
 202       g_source_set_callback (source,
 203                              (GSourceFunc) _g_socket_read_with_control_messages_ready,
 204                              data,
 205                              (GDestroyNotify) read_with_control_data_free);
 206       g_source_attach (source, g_main_context_get_thread_default ());
 207       g_source_unref (source);
 208     }
 209   else
 210     {
 211       _g_socket_read_with_control_messages_ready (data->socket, G_IO_IN, data);
 212       read_with_control_data_free (data);
 213     }
 214 }
 215
 216 static gssize
 217 _g_socket_read_with_control_messages_finish (GSocket       *socket,
 218                                              GAsyncResult  *result,
 219                                              GError       **error)
 220 {
 221   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
 222
 223   g_return_val_if_fail (G_IS_SOCKET (socket), -1);
 224   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == _g_socket_read_with_control_messages);
 225
 226   if (g_simple_async_result_propagate_error (simple, error))
 227       return -1;
 228   else
 229     return g_simple_async_result_get_op_res_gssize (simple);
 230 }
 231
 232 /* ---------------------------------------------------------------------------------------------------- */
 233
 234 /* Work-around for https://bugzilla.gnome.org/show_bug.cgi?id=627724 */
 235
 236 static GPtrArray *ensured_classes = NULL;
 237
 238 static void
 239 ensure_type (GType gtype)
 240 {
 241   g_ptr_array_add (ensured_classes, g_type_class_ref (gtype));
 242 }
 243
 244 static void
 245 release_required_types (void)
 246 {
 247   g_ptr_array_foreach (ensured_classes, (GFunc) g_type_class_unref, NULL);
 248   g_ptr_array_unref (ensured_classes);
 249   ensured_classes = NULL;
 250 }
 251
 252 static void
 253 ensure_required_types (void)
 254 {
 255   g_assert (ensured_classes == NULL);
 256   ensured_classes = g_ptr_array_new ();
 257   ensure_type (G_TYPE_SIMPLE_ASYNC_RESULT);
 258   ensure_type (G_TYPE_MEMORY_INPUT_STREAM);
 259 }
 260 /* ---------------------------------------------------------------------------------------------------- */
 261
 262 typedef struct
 263 {
 264   volatile gint refcount;
 265   GThread *thread;
 266   GMainContext *context;
 267   GMainLoop *loop;
 268 } SharedThreadData;
 269
 270 static gpointer
 271 gdbus_shared_thread_func (gpointer user_data)
 272 {
 273   SharedThreadData *data = user_data;
 274
 275   g_main_context_push_thread_default (data->context);
 276   g_main_loop_run (data->loop);
 277   g_main_context_pop_thread_default (data->context);
 278
 279   release_required_types ();
 280
 281   return NULL;
 282 }
 283
 284 /* ---------------------------------------------------------------------------------------------------- */
 285
 286 static SharedThreadData *
 287 _g_dbus_shared_thread_ref (void)
 288 {
 289   static gsize shared_thread_data = 0;
 290   SharedThreadData *ret;
 291
 292   if (g_once_init_enter (&shared_thread_data))
 293     {
 294       SharedThreadData *data;
 295
 296       /* Work-around for https://bugzilla.gnome.org/show_bug.cgi?id=627724 */
 297       ensure_required_types ();
 298
 299       data = g_new0 (SharedThreadData, 1);
 300       data->refcount = 0;
 301
 302       data->context = g_main_context_new ();
 303       data->loop = g_main_loop_new (data->context, FALSE);
 304       data->thread = g_thread_new ("gdbus",
 305                                    gdbus_shared_thread_func,
 306                                    data);
 307       /* We can cast between gsize and gpointer safely */
 308       g_once_init_leave (&shared_thread_data, (gsize) data);
 309     }
 310
 311   ret = (SharedThreadData*) shared_thread_data;
 312   g_atomic_int_inc (&ret->refcount);
 313   return ret;
 314 }
 315
 316 static void
 317 _g_dbus_shared_thread_unref (SharedThreadData *data)
 318 {
 319   /* TODO: actually destroy the shared thread here */
 320 #if 0
 321   g_assert (data != NULL);
 322   if (g_atomic_int_dec_and_test (&data->refcount))
 323     {
 324       g_main_loop_quit (data->loop);
 325       //g_thread_join (data->thread);
 326       g_main_loop_unref (data->loop);
 327       g_main_context_unref (data->context);
 328     }
 329 #endif
 330 }
 331
 332 /* ---------------------------------------------------------------------------------------------------- */
 333
 334 typedef enum {
 335     PENDING_NONE = 0,
 336     PENDING_WRITE,
 337     PENDING_FLUSH,
 338     PENDING_CLOSE
 339 } OutputPending;
 340
 341 struct GDBusWorker
 342 {
 343   volatile gint                       ref_count;
 344
 345   SharedThreadData                   *shared_thread_data;
 346
 347   /* really a boolean, but GLib 2.28 lacks atomic boolean ops */
 348   volatile gint                       stopped;
 349
 350   /* TODO: frozen (e.g. G_DBUS_CONNECTION_FLAGS_DELAY_MESSAGE_PROCESSING) currently
 351    * only affects messages received from the other peer (since GDBusServer is the
 352    * only user) - we might want it to affect messages sent to the other peer too?
 353    */
 354   gboolean                            frozen;
 355   GDBusCapabilityFlags                capabilities;
 356   GQueue                             *received_messages_while_frozen;
 357
 358   GIOStream                          *stream;
 359   GCancellable                       *cancellable;
 360   GDBusWorkerMessageReceivedCallback  message_received_callback;
 361   GDBusWorkerMessageAboutToBeSentCallback message_about_to_be_sent_callback;
 362   GDBusWorkerDisconnectedCallback     disconnected_callback;
 363   gpointer                            user_data;
 364
 365   /* if not NULL, stream is GSocketConnection */
 366   GSocket *socket;
 367
 368   /* used for reading */
 369   GMutex                              read_lock;
 370   gchar                              *read_buffer;
 371   gsize                               read_buffer_allocated_size;
 372   gsize                               read_buffer_cur_size;
 373   gsize                               read_buffer_bytes_wanted;
 374   GUnixFDList                        *read_fd_list;
 375   GSocketControlMessage             **read_ancillary_messages;
 376   gint                                read_num_ancillary_messages;
 377
 378   /* Whether an async write, flush or close, or none of those, is pending.
 379    * Only the worker thread may change its value, and only with the write_lock.
 380    * Other threads may read its value when holding the write_lock.
 381    * The worker thread may read its value at any time.
 382    */
 383   OutputPending                       output_pending;
 384   /* used for writing */
 385   GMutex                              write_lock;
 386   /* queue of MessageToWriteData, protected by write_lock */
 387   GQueue                             *write_queue;
 388   /* protected by write_lock */
 389   guint64                             write_num_messages_written;
 390   /* number of messages we'd written out last time we flushed;
 391    * protected by write_lock
 392    */
 393   guint64                             write_num_messages_flushed;
 394   /* list of FlushData, protected by write_lock */
 395   GList                              *write_pending_flushes;
 396   /* list of CloseData, protected by write_lock */
 397   GList                              *pending_close_attempts;
 398   /* no lock - only used from the worker thread */
 399   gboolean                            close_expected;
 400 };
 401
 402 static void _g_dbus_worker_unref (GDBusWorker *worker);
 403
 404 /* ---------------------------------------------------------------------------------------------------- */
 405
 406 typedef struct
 407 {
 408   GMutex  mutex;
 409   GCond   cond;
 410   guint64 number_to_wait_for;
 411   GError *error;
 412 } FlushData;
 413
 414 struct _MessageToWriteData ;
 415 typedef struct _MessageToWriteData MessageToWriteData;
 416
 417 static void message_to_write_data_free (MessageToWriteData *data);
 418
 419 static void read_message_print_transport_debug (gssize bytes_read,
 420                                                 GDBusWorker *worker);
 421
 422 static void write_message_print_transport_debug (gssize bytes_written,
 423                                                  MessageToWriteData *data);
 424
 425 typedef struct {
 426     GDBusWorker *worker;
 427     GCancellable *cancellable;
 428     GSimpleAsyncResult *result;
 429 } CloseData;
 430
 431 static void close_data_free (CloseData *close_data)
 432 {
 433   if (close_data->cancellable != NULL)
 434     g_object_unref (close_data->cancellable);
 435
 436   if (close_data->result != NULL)
 437     g_object_unref (close_data->result);
 438
 439   _g_dbus_worker_unref (close_data->worker);
 440   g_slice_free (CloseData, close_data);
 441 }
 442
 443 /* ---------------------------------------------------------------------------------------------------- */
 444
 445 static GDBusWorker *
 446 _g_dbus_worker_ref (GDBusWorker *worker)
 447 {
 448   g_atomic_int_inc (&worker->ref_count);
 449   return worker;
 450 }
 451
 452 static void
 453 _g_dbus_worker_unref (GDBusWorker *worker)
 454 {
 455   if (g_atomic_int_dec_and_test (&worker->ref_count))
 456     {
 457       g_assert (worker->write_pending_flushes == NULL);
 458
 459       _g_dbus_shared_thread_unref (worker->shared_thread_data);
 460
 461       g_object_unref (worker->stream);
 462
 463       g_mutex_clear (&worker->read_lock);
 464       g_object_unref (worker->cancellable);
 465       if (worker->read_fd_list != NULL)
 466         g_object_unref (worker->read_fd_list);
 467
 468       g_queue_foreach (worker->received_messages_while_frozen, (GFunc) g_object_unref, NULL);
 469       g_queue_free (worker->received_messages_while_frozen);
 470
 471       g_mutex_clear (&worker->write_lock);
 472       g_queue_foreach (worker->write_queue, (GFunc) message_to_write_data_free, NULL);
 473       g_queue_free (worker->write_queue);
 474
 475       g_free (worker->read_buffer);
 476
 477       g_free (worker);
 478     }
 479 }
 480
 481 static void
 482 _g_dbus_worker_emit_disconnected (GDBusWorker  *worker,
 483                                   gboolean      remote_peer_vanished,
 484                                   GError       *error)
 485 {
 486   if (!g_atomic_int_get (&worker->stopped))
 487     worker->disconnected_callback (worker, remote_peer_vanished, error, worker->user_data);
 488 }
 489
 490 static void
 491 _g_dbus_worker_emit_message_received (GDBusWorker  *worker,
 492                                       GDBusMessage *message)
 493 {
 494   if (!g_atomic_int_get (&worker->stopped))
 495     worker->message_received_callback (worker, message, worker->user_data);
 496 }
 497
 498 static GDBusMessage *
 499 _g_dbus_worker_emit_message_about_to_be_sent (GDBusWorker  *worker,
 500                                               GDBusMessage *message)
 501 {
 502   GDBusMessage *ret;
 503   if (!g_atomic_int_get (&worker->stopped))
 504     ret = worker->message_about_to_be_sent_callback (worker, message, worker->user_data);
 505   else
 506     ret = message;
 507   return ret;
 508 }
 509
 510 /* can only be called from private thread with read-lock held - takes ownership of @message */
 511 static void
 512 _g_dbus_worker_queue_or_deliver_received_message (GDBusWorker  *worker,
 513                                                   GDBusMessage *message)
 514 {
 515   if (worker->frozen || g_queue_get_length (worker->received_messages_while_frozen) > 0)
 516     {
 517       /* queue up */
 518       g_queue_push_tail (worker->received_messages_while_frozen, message);
 519     }
 520   else
 521     {
 522       /* not frozen, nor anything in queue */
 523       _g_dbus_worker_emit_message_received (worker, message);
 524       g_object_unref (message);
 525     }
 526 }
 527
 528 /* called in private thread shared by all GDBusConnection instances (without read-lock held) */
 529 static gboolean
 530 unfreeze_in_idle_cb (gpointer user_data)
 531 {
 532   GDBusWorker *worker = user_data;
 533   GDBusMessage *message;
 534
 535   g_mutex_lock (&worker->read_lock);
 536   if (worker->frozen)
 537     {
 538       while ((message = g_queue_pop_head (worker->received_messages_while_frozen)) != NULL)
 539         {
 540           _g_dbus_worker_emit_message_received (worker, message);
 541           g_object_unref (message);
 542         }
 543       worker->frozen = FALSE;
 544     }
 545   else
 546     {
 547       g_assert (g_queue_get_length (worker->received_messages_while_frozen) == 0);
 548     }
 549   g_mutex_unlock (&worker->read_lock);
 550   return FALSE;
 551 }
 552
 553 /* can be called from any thread */
 554 void
 555 _g_dbus_worker_unfreeze (GDBusWorker *worker)
 556 {
 557   GSource *idle_source;
 558   idle_source = g_idle_source_new ();
 559   g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
 560   g_source_set_callback (idle_source,
 561                          unfreeze_in_idle_cb,
 562                          _g_dbus_worker_ref (worker),
 563                          (GDestroyNotify) _g_dbus_worker_unref);
 564   g_source_attach (idle_source, worker->shared_thread_data->context);
 565   g_source_unref (idle_source);
 566 }
 567
 568 /* ---------------------------------------------------------------------------------------------------- */
 569
 570 static void _g_dbus_worker_do_read_unlocked (GDBusWorker *worker);
 571
 572 /* called in private thread shared by all GDBusConnection instances (without read-lock held) */
 573 static void
 574 _g_dbus_worker_do_read_cb (GInputStream  *input_stream,
 575                            GAsyncResult  *res,
 576                            gpointer       user_data)
 577 {
 578   GDBusWorker *worker = user_data;
 579   GError *error;
 580   gssize bytes_read;
 581
 582   g_mutex_lock (&worker->read_lock);
 583
 584   /* If already stopped, don't even process the reply */
 585   if (g_atomic_int_get (&worker->stopped))
 586     goto out;
 587
 588   error = NULL;
 589   if (worker->socket == NULL)
 590     bytes_read = g_input_stream_read_finish (g_io_stream_get_input_stream (worker->stream),
 591                                              res,
 592                                              &error);
 593   else
 594     bytes_read = _g_socket_read_with_control_messages_finish (worker->socket,
 595                                                               res,
 596                                                               &error);
 597   if (worker->read_num_ancillary_messages > 0)
 598     {
 599       gint n;
 600       for (n = 0; n < worker->read_num_ancillary_messages; n++)
 601         {
 602           GSocketControlMessage *control_message = G_SOCKET_CONTROL_MESSAGE (worker->read_ancillary_messages[n]);
 603
 604           if (FALSE)
 605             {
 606             }
 607 #ifdef G_OS_UNIX
 608           else if (G_IS_UNIX_FD_MESSAGE (control_message))
 609             {
 610               GUnixFDMessage *fd_message;
 611               gint *fds;
 612               gint num_fds;
 613
 614               fd_message = G_UNIX_FD_MESSAGE (control_message);
 615               fds = g_unix_fd_message_steal_fds (fd_message, &num_fds);
 616               if (worker->read_fd_list == NULL)
 617                 {
 618                   worker->read_fd_list = g_unix_fd_list_new_from_array (fds, num_fds);
 619                 }
 620               else
 621                 {
 622                   gint n;
 623                   for (n = 0; n < num_fds; n++)
 624                     {
 625                       /* TODO: really want a append_steal() */
 626                       g_unix_fd_list_append (worker->read_fd_list, fds[n], NULL);
 627                       close (fds[n]);
 628                     }
 629                 }
 630               g_free (fds);
 631             }
 632           else if (G_IS_UNIX_CREDENTIALS_MESSAGE (control_message))
 633             {
 634               /* do nothing */
 635             }
 636 #endif
 637           else
 638             {
 639               if (error == NULL)
 640                 {
 641                   g_set_error (&error,
 642                                G_IO_ERROR,
 643                                G_IO_ERROR_FAILED,
 644                                "Unexpected ancillary message of type %s received from peer",
 645                                g_type_name (G_TYPE_FROM_INSTANCE (control_message)));
 646                   _g_dbus_worker_emit_disconnected (worker, TRUE, error);
 647                   g_error_free (error);
 648                   g_object_unref (control_message);
 649                   n++;
 650                   while (n < worker->read_num_ancillary_messages)
 651                     g_object_unref (worker->read_ancillary_messages[n++]);
 652                   g_free (worker->read_ancillary_messages);
 653                   goto out;
 654                 }
 655             }
 656           g_object_unref (control_message);
 657         }
 658       g_free (worker->read_ancillary_messages);
 659     }
 660
 661   if (bytes_read == -1)
 662     {
 663       if (G_UNLIKELY (_g_dbus_debug_transport ()))
 664         {
 665           _g_dbus_debug_print_lock ();
 666           g_print ("========================================================================\n"
 667                    "GDBus-debug:Transport:\n"
 668                    "  ---- READ ERROR on stream of type %s:\n"
 669                    "  ---- %s %d: %s\n",
 670                    g_type_name (G_TYPE_FROM_INSTANCE (g_io_stream_get_input_stream (worker->stream))),
 671                    g_quark_to_string (error->domain), error->code,
 672                    error->message);
 673           _g_dbus_debug_print_unlock ();
 674         }
 675
 676       /* Every async read that uses this callback uses worker->cancellable
 677        * as its GCancellable. worker->cancellable gets cancelled if and only
 678        * if the GDBusConnection tells us to close (either via
 679        * _g_dbus_worker_stop, which is called on last-unref, or directly),
 680        * so a cancelled read must mean our connection was closed locally.
 681        *
 682        * If we're closing, other errors are possible - notably,
 683        * G_IO_ERROR_CLOSED can be seen if we close the stream with an async
 684        * read in-flight. It seems sensible to treat all read errors during
 685        * closing as an expected thing that doesn't trip exit-on-close.
 686        *
 687        * Because close_expected can't be set until we get into the worker
 688        * thread, but the cancellable is signalled sooner (from another
 689        * thread), we do still need to check the error.
 690        */
 691       if (worker->close_expected ||
 692           g_error_matches (error, G_IO_ERROR, G_IO_ERROR_CANCELLED))
 693         _g_dbus_worker_emit_disconnected (worker, FALSE, NULL);
 694       else
 695         _g_dbus_worker_emit_disconnected (worker, TRUE, error);
 696
 697       g_error_free (error);
 698       goto out;
 699     }
 700
 701 #if 0
 702   g_debug ("read %d bytes (is_closed=%d blocking=%d condition=0x%02x) stream %p, %p",
 703            (gint) bytes_read,
 704            g_socket_is_closed (g_socket_connection_get_socket (G_SOCKET_CONNECTION (worker->stream))),
 705            g_socket_get_blocking (g_socket_connection_get_socket (G_SOCKET_CONNECTION (worker->stream))),
 706            g_socket_condition_check (g_socket_connection_get_socket (G_SOCKET_CONNECTION (worker->stream)),
 707                                      G_IO_IN | G_IO_OUT | G_IO_HUP),
 708            worker->stream,
 709            worker);
 710 #endif
 711
 712   /* TODO: hmm, hmm... */
 713   if (bytes_read == 0)
 714     {
 715       g_set_error (&error,
 716                    G_IO_ERROR,
 717                    G_IO_ERROR_FAILED,
 718                    "Underlying GIOStream returned 0 bytes on an async read");
 719       _g_dbus_worker_emit_disconnected (worker, TRUE, error);
 720       g_error_free (error);
 721       goto out;
 722     }
 723
 724   read_message_print_transport_debug (bytes_read, worker);
 725
 726   worker->read_buffer_cur_size += bytes_read;
 727   if (worker->read_buffer_bytes_wanted == worker->read_buffer_cur_size)
 728     {
 729       /* OK, got what we asked for! */
 730       if (worker->read_buffer_bytes_wanted == 16)
 731         {
 732           gssize message_len;
 733           /* OK, got the header - determine how many more bytes are needed */
 734           error = NULL;
 735           message_len = g_dbus_message_bytes_needed ((guchar *) worker->read_buffer,
 736                                                      16,
 737                                                      &error);
 738           if (message_len == -1)
 739             {
 740               g_warning ("_g_dbus_worker_do_read_cb: error determing bytes needed: %s", error->message);
 741               _g_dbus_worker_emit_disconnected (worker, FALSE, error);
 742               g_error_free (error);
 743               goto out;
 744             }
 745
 746           worker->read_buffer_bytes_wanted = message_len;
 747           _g_dbus_worker_do_read_unlocked (worker);
 748         }
 749       else
 750         {
 751           GDBusMessage *message;
 752           error = NULL;
 753
 754           /* TODO: use connection->priv->auth to decode the message */
 755
 756           message = g_dbus_message_new_from_blob ((guchar *) worker->read_buffer,
 757                                                   worker->read_buffer_cur_size,
 758                                                   worker->capabilities,
 759                                                   &error);
 760           if (message == NULL)
 761             {
 762               gchar *s;
 763               s = _g_dbus_hexdump (worker->read_buffer, worker->read_buffer_cur_size, 2);
 764               g_warning ("Error decoding D-Bus message of %" G_GSIZE_FORMAT " bytes\n"
 765                          "The error is: %s\n"
 766                          "The payload is as follows:\n"
 767                          "%s\n",
 768                          worker->read_buffer_cur_size,
 769                          error->message,
 770                          s);
 771               g_free (s);
 772               _g_dbus_worker_emit_disconnected (worker, FALSE, error);
 773               g_error_free (error);
 774               goto out;
 775             }
 776
 777 #ifdef G_OS_UNIX
 778           if (worker->read_fd_list != NULL)
 779             {
 780               g_dbus_message_set_unix_fd_list (message, worker->read_fd_list);
 781               g_object_unref (worker->read_fd_list);
 782               worker->read_fd_list = NULL;
 783             }
 784 #endif
 785
 786           if (G_UNLIKELY (_g_dbus_debug_message ()))
 787             {
 788               gchar *s;
 789               _g_dbus_debug_print_lock ();
 790               g_print ("========================================================================\n"
 791                        "GDBus-debug:Message:\n"
 792                        "  <<<< RECEIVED D-Bus message (%" G_GSIZE_FORMAT " bytes)\n",
 793                        worker->read_buffer_cur_size);
 794               s = g_dbus_message_print (message, 2);
 795               g_print ("%s", s);
 796               g_free (s);
 797               if (G_UNLIKELY (_g_dbus_debug_payload ()))
 798                 {
 799                   s = _g_dbus_hexdump (worker->read_buffer, worker->read_buffer_cur_size, 2);
 800                   g_print ("%s\n", s);
 801                   g_free (s);
 802                 }
 803               _g_dbus_debug_print_unlock ();
 804             }
 805
 806           /* yay, got a message, go deliver it */
 807           _g_dbus_worker_queue_or_deliver_received_message (worker, message);
 808
 809           /* start reading another message! */
 810           worker->read_buffer_bytes_wanted = 0;
 811           worker->read_buffer_cur_size = 0;
 812           _g_dbus_worker_do_read_unlocked (worker);
 813         }
 814     }
 815   else
 816     {
 817       /* didn't get all the bytes we requested - so repeat the request... */
 818       _g_dbus_worker_do_read_unlocked (worker);
 819     }
 820
 821  out:
 822   g_mutex_unlock (&worker->read_lock);
 823
 824   /* gives up the reference acquired when calling g_input_stream_read_async() */
 825   _g_dbus_worker_unref (worker);
 826 }
 827
 828 /* called in private thread shared by all GDBusConnection instances (with read-lock held) */
 829 static void
 830 _g_dbus_worker_do_read_unlocked (GDBusWorker *worker)
 831 {
 832   /* Note that we do need to keep trying to read even if close_expected is
 833    * true, because only failing a read causes us to signal 'closed'.
 834    */
 835
 836   /* if bytes_wanted is zero, it means start reading a message */
 837   if (worker->read_buffer_bytes_wanted == 0)
 838     {
 839       worker->read_buffer_cur_size = 0;
 840       worker->read_buffer_bytes_wanted = 16;
 841     }
 842
 843   /* ensure we have a (big enough) buffer */
 844   if (worker->read_buffer == NULL || worker->read_buffer_bytes_wanted > worker->read_buffer_allocated_size)
 845     {
 846       /* TODO: 4096 is randomly chosen; might want a better chosen default minimum */
 847       worker->read_buffer_allocated_size = MAX (worker->read_buffer_bytes_wanted, 4096);
 848       worker->read_buffer = g_realloc (worker->read_buffer, worker->read_buffer_allocated_size);
 849     }
 850
 851   if (worker->socket == NULL)
 852     g_input_stream_read_async (g_io_stream_get_input_stream (worker->stream),
 853                                worker->read_buffer + worker->read_buffer_cur_size,
 854                                worker->read_buffer_bytes_wanted - worker->read_buffer_cur_size,
 855                                G_PRIORITY_DEFAULT,
 856                                worker->cancellable,
 857                                (GAsyncReadyCallback) _g_dbus_worker_do_read_cb,
 858                                _g_dbus_worker_ref (worker));
 859   else
 860     {
 861       worker->read_ancillary_messages = NULL;
 862       worker->read_num_ancillary_messages = 0;
 863       _g_socket_read_with_control_messages (worker->socket,
 864                                             worker->read_buffer + worker->read_buffer_cur_size,
 865                                             worker->read_buffer_bytes_wanted - worker->read_buffer_cur_size,
 866                                             &worker->read_ancillary_messages,
 867                                             &worker->read_num_ancillary_messages,
 868                                             G_PRIORITY_DEFAULT,
 869                                             worker->cancellable,
 870                                             (GAsyncReadyCallback) _g_dbus_worker_do_read_cb,
 871                                             _g_dbus_worker_ref (worker));
 872     }
 873 }
 874
 875 /* called in private thread shared by all GDBusConnection instances (without read-lock held) */
 876 static gboolean
 877 _g_dbus_worker_do_initial_read (gpointer data)
 878 {
 879   GDBusWorker *worker = data;
 880   g_mutex_lock (&worker->read_lock);
 881   _g_dbus_worker_do_read_unlocked (worker);
 882   g_mutex_unlock (&worker->read_lock);
 883   return FALSE;
 884 }
 885
 886 /* ---------------------------------------------------------------------------------------------------- */
 887
 888 struct _MessageToWriteData
 889 {
 890   GDBusWorker  *worker;
 891   GDBusMessage *message;
 892   gchar        *blob;
 893   gsize         blob_size;
 894
 895   gsize               total_written;
 896   GSimpleAsyncResult *simple;
 897
 898 };
 899
 900 static void
 901 message_to_write_data_free (MessageToWriteData *data)
 902 {
 903   _g_dbus_worker_unref (data->worker);
 904   if (data->message)
 905     g_object_unref (data->message);
 906   g_free (data->blob);
 907   g_free (data);
 908 }
 909
 910 /* ---------------------------------------------------------------------------------------------------- */
 911
 912 static void write_message_continue_writing (MessageToWriteData *data);
 913
 914 /* called in private thread shared by all GDBusConnection instances
 915  *
 916  * write-lock is not held on entry
 917  * output_pending is PENDING_WRITE on entry
 918  */
 919 static void
 920 write_message_async_cb (GObject      *source_object,
 921                         GAsyncResult *res,
 922                         gpointer      user_data)
 923 {
 924   MessageToWriteData *data = user_data;
 925   GSimpleAsyncResult *simple;
 926   gssize bytes_written;
 927   GError *error;
 928
 929   /* Note: we can't access data->simple after calling g_async_result_complete () because the
 930    * callback can free @data and we're not completing in idle. So use a copy of the pointer.
 931    */
 932   simple = data->simple;
 933
 934   error = NULL;
 935   bytes_written = g_output_stream_write_finish (G_OUTPUT_STREAM (source_object),
 936                                                 res,
 937                                                 &error);
 938   if (bytes_written == -1)
 939     {
 940       g_simple_async_result_take_error (simple, error);
 941       g_simple_async_result_complete (simple);
 942       g_object_unref (simple);
 943       goto out;
 944     }
 945   g_assert (bytes_written > 0); /* zero is never returned */
 946
 947   write_message_print_transport_debug (bytes_written, data);
 948
 949   data->total_written += bytes_written;
 950   g_assert (data->total_written <= data->blob_size);
 951   if (data->total_written == data->blob_size)
 952     {
 953       g_simple_async_result_complete (simple);
 954       g_object_unref (simple);
 955       goto out;
 956     }
 957
 958   write_message_continue_writing (data);
 959
 960  out:
 961   ;
 962 }
 963
 964 /* called in private thread shared by all GDBusConnection instances
 965  *
 966  * write-lock is not held on entry
 967  * output_pending is PENDING_WRITE on entry
 968  */
 969 static gboolean
 970 on_socket_ready (GSocket      *socket,
 971                  GIOCondition  condition,
 972                  gpointer      user_data)
 973 {
 974   MessageToWriteData *data = user_data;
 975   write_message_continue_writing (data);
 976   return FALSE; /* remove source */
 977 }
 978
 979 /* called in private thread shared by all GDBusConnection instances
 980  *
 981  * write-lock is not held on entry
 982  * output_pending is PENDING_WRITE on entry
 983  */
 984 static void
 985 write_message_continue_writing (MessageToWriteData *data)
 986 {
 987   GOutputStream *ostream;
 988   GSimpleAsyncResult *simple;
 989 #ifdef G_OS_UNIX
 990   GUnixFDList *fd_list;
 991 #endif
 992
 993   /* Note: we can't access data->simple after calling g_async_result_complete () because the
 994    * callback can free @data and we're not completing in idle. So use a copy of the pointer.
 995    */
 996   simple = data->simple;
 997
 998   ostream = g_io_stream_get_output_stream (data->worker->stream);
 999 #ifdef G_OS_UNIX
1000   fd_list = g_dbus_message_get_unix_fd_list (data->message);
1001 #endif
1002
1003   g_assert (!g_output_stream_has_pending (ostream));
1004   g_assert_cmpint (data->total_written, <, data->blob_size);
1005
1006   if (FALSE)
1007     {
1008     }
1009 #ifdef G_OS_UNIX
1010   else if (G_IS_SOCKET_OUTPUT_STREAM (ostream) && data->total_written == 0)
1011     {
1012       GOutputVector vector;
1013       GSocketControlMessage *control_message;
1014       gssize bytes_written;
1015       GError *error;
1016
1017       vector.buffer = data->blob;
1018       vector.size = data->blob_size;
1019
1020       control_message = NULL;
1021       if (fd_list != NULL && g_unix_fd_list_get_length (fd_list) > 0)
1022         {
1023           if (!(data->worker->capabilities & G_DBUS_CAPABILITY_FLAGS_UNIX_FD_PASSING))
1024             {
1025               g_simple_async_result_set_error (simple,
1026                                                G_IO_ERROR,
1027                                                G_IO_ERROR_FAILED,
1028                                                "Tried sending a file descriptor but remote peer does not support this capability");
1029               g_simple_async_result_complete (simple);
1030               g_object_unref (simple);
1031               goto out;
1032             }
1033           control_message = g_unix_fd_message_new_with_fd_list (fd_list);
1034         }
1035
1036       error = NULL;
1037       bytes_written = g_socket_send_message (data->worker->socket,
1038                                              NULL, /* address */
1039                                              &vector,
1040                                              1,
1041                                              control_message != NULL ? &control_message : NULL,
1042                                              control_message != NULL ? 1 : 0,
1043                                              G_SOCKET_MSG_NONE,
1044                                              data->worker->cancellable,
1045                                              &error);
1046       if (control_message != NULL)
1047         g_object_unref (control_message);
1048
1049       if (bytes_written == -1)
1050         {
1051           /* Handle WOULD_BLOCK by waiting until there's room in the buffer */
1052           if (g_error_matches (error, G_IO_ERROR, G_IO_ERROR_WOULD_BLOCK))
1053             {
1054               GSource *source;
1055               source = g_socket_create_source (data->worker->socket,
1056                                                G_IO_OUT | G_IO_HUP | G_IO_ERR,
1057                                                data->worker->cancellable);
1058               g_source_set_callback (source,
1059                                      (GSourceFunc) on_socket_ready,
1060                                      data,
1061                                      NULL); /* GDestroyNotify */
1062               g_source_attach (source, g_main_context_get_thread_default ());
1063               g_source_unref (source);
1064               g_error_free (error);
1065               goto out;
1066             }
1067           g_simple_async_result_take_error (simple, error);
1068           g_simple_async_result_complete (simple);
1069           g_object_unref (simple);
1070           goto out;
1071         }
1072       g_assert (bytes_written > 0); /* zero is never returned */
1073
1074       write_message_print_transport_debug (bytes_written, data);
1075
1076       data->total_written += bytes_written;
1077       g_assert (data->total_written <= data->blob_size);
1078       if (data->total_written == data->blob_size)
1079         {
1080           g_simple_async_result_complete (simple);
1081           g_object_unref (simple);
1082           goto out;
1083         }
1084
1085       write_message_continue_writing (data);
1086     }
1087 #endif
1088   else
1089     {
1090 #ifdef G_OS_UNIX
1091       if (fd_list != NULL)
1092         {
1093           g_simple_async_result_set_error (simple,
1094                                            G_IO_ERROR,
1095                                            G_IO_ERROR_FAILED,
1096                                            "Tried sending a file descriptor on unsupported stream of type %s",
1097                                            g_type_name (G_TYPE_FROM_INSTANCE (ostream)));
1098           g_simple_async_result_complete (simple);
1099           g_object_unref (simple);
1100           goto out;
1101         }
1102 #endif
1103
1104       g_output_stream_write_async (ostream,
1105                                    (const gchar *) data->blob + data->total_written,
1106                                    data->blob_size - data->total_written,
1107                                    G_PRIORITY_DEFAULT,
1108                                    data->worker->cancellable,
1109                                    write_message_async_cb,
1110                                    data);
1111     }
1112  out:
1113   ;
1114 }
1115
1116 /* called in private thread shared by all GDBusConnection instances
1117  *
1118  * write-lock is not held on entry
1119  * output_pending is PENDING_WRITE on entry
1120  */
1121 static void
1122 write_message_async (GDBusWorker         *worker,
1123                      MessageToWriteData  *data,
1124                      GAsyncReadyCallback  callback,
1125                      gpointer             user_data)
1126 {
1127   data->simple = g_simple_async_result_new (NULL,
1128                                             callback,
1129                                             user_data,
1130                                             write_message_async);
1131   data->total_written = 0;
1132   write_message_continue_writing (data);
1133 }
1134
1135 /* called in private thread shared by all GDBusConnection instances (with write-lock held) */
1136 static gboolean
1137 write_message_finish (GAsyncResult   *res,
1138                       GError        **error)
1139 {
1140   g_warn_if_fail (g_simple_async_result_get_source_tag (G_SIMPLE_ASYNC_RESULT (res)) == write_message_async);
1141   if (g_simple_async_result_propagate_error (G_SIMPLE_ASYNC_RESULT (res), error))
1142     return FALSE;
1143   else
1144     return TRUE;
1145 }
1146 /* ---------------------------------------------------------------------------------------------------- */
1147
1148 static void continue_writing (GDBusWorker *worker);
1149
1150 typedef struct
1151 {
1152   GDBusWorker *worker;
1153   GList *flushers;
1154 } FlushAsyncData;
1155
1156 static void
1157 flush_data_list_complete (const GList  *flushers,
1158                           const GError *error)
1159 {
1160   const GList *l;
1161
1162   for (l = flushers; l != NULL; l = l->next)
1163     {
1164       FlushData *f = l->data;
1165
1166       f->error = error != NULL ? g_error_copy (error) : NULL;
1167
1168       g_mutex_lock (&f->mutex);
1169       g_cond_signal (&f->cond);
1170       g_mutex_unlock (&f->mutex);
1171     }
1172 }
1173
1174 /* called in private thread shared by all GDBusConnection instances
1175  *
1176  * write-lock is not held on entry
1177  * output_pending is PENDING_FLUSH on entry
1178  */
1179 static void
1180 ostream_flush_cb (GObject      *source_object,
1181                   GAsyncResult *res,
1182                   gpointer      user_data)
1183 {
1184   FlushAsyncData *data = user_data;
1185   GError *error;
1186
1187   error = NULL;
1188   g_output_stream_flush_finish (G_OUTPUT_STREAM (source_object),
1189                                 res,
1190                                 &error);
1191
1192   if (error == NULL)
1193     {
1194       if (G_UNLIKELY (_g_dbus_debug_transport ()))
1195         {
1196           _g_dbus_debug_print_lock ();
1197           g_print ("========================================================================\n"
1198                    "GDBus-debug:Transport:\n"
1199                    "  ---- FLUSHED stream of type %s\n",
1200                    g_type_name (G_TYPE_FROM_INSTANCE (g_io_stream_get_output_stream (data->worker->stream))));
1201           _g_dbus_debug_print_unlock ();
1202         }
1203     }
1204
1205   g_assert (data->flushers != NULL);
1206   flush_data_list_complete (data->flushers, error);
1207   g_list_free (data->flushers);
1208
1209   if (error != NULL)
1210     g_error_free (error);
1211
1212   /* Make sure we tell folks that we don't have additional
1213      flushes pending */
1214   g_mutex_lock (&data->worker->write_lock);
1215   data->worker->write_num_messages_flushed = data->worker->write_num_messages_written;
1216   g_assert (data->worker->output_pending == PENDING_FLUSH);
1217   data->worker->output_pending = PENDING_NONE;
1218   g_mutex_unlock (&data->worker->write_lock);
1219
1220   /* OK, cool, finally kick off the next write */
1221   continue_writing (data->worker);
1222
1223   _g_dbus_worker_unref (data->worker);
1224   g_free (data);
1225 }
1226
1227 /* called in private thread shared by all GDBusConnection instances
1228  *
1229  * write-lock is not held on entry
1230  * output_pending is PENDING_FLUSH on entry
1231  */
1232 static void
1233 start_flush (FlushAsyncData *data)
1234 {
1235   g_output_stream_flush_async (g_io_stream_get_output_stream (data->worker->stream),
1236                                G_PRIORITY_DEFAULT,
1237                                data->worker->cancellable,
1238                                ostream_flush_cb,
1239                                data);
1240 }
1241
1242 /* called in private thread shared by all GDBusConnection instances
1243  *
1244  * write-lock is held on entry
1245  * output_pending is PENDING_NONE on entry
1246  */
1247 static void
1248 message_written_unlocked (GDBusWorker *worker,
1249                           MessageToWriteData *message_data)
1250 {
1251   if (G_UNLIKELY (_g_dbus_debug_message ()))
1252     {
1253       gchar *s;
1254       _g_dbus_debug_print_lock ();
1255       g_print ("========================================================================\n"
1256                "GDBus-debug:Message:\n"
1257                "  >>>> SENT D-Bus message (%" G_GSIZE_FORMAT " bytes)\n",
1258                message_data->blob_size);
1259       s = g_dbus_message_print (message_data->message, 2);
1260       g_print ("%s", s);
1261       g_free (s);
1262       if (G_UNLIKELY (_g_dbus_debug_payload ()))
1263         {
1264           s = _g_dbus_hexdump (message_data->blob, message_data->blob_size, 2);
1265           g_print ("%s\n", s);
1266           g_free (s);
1267         }
1268       _g_dbus_debug_print_unlock ();
1269     }
1270
1271   worker->write_num_messages_written += 1;
1272 }
1273
1274 /* called in private thread shared by all GDBusConnection instances
1275  *
1276  * write-lock is held on entry
1277  * output_pending is PENDING_NONE on entry
1278  *
1279  * Returns: non-%NULL, setting @output_pending, if we need to flush now
1280  */
1281 static FlushAsyncData *
1282 prepare_flush_unlocked (GDBusWorker *worker)
1283 {
1284   GList *l;
1285   GList *ll;
1286   GList *flushers;
1287
1288   flushers = NULL;
1289   for (l = worker->write_pending_flushes; l != NULL; l = ll)
1290     {
1291       FlushData *f = l->data;
1292       ll = l->next;
1293
1294       if (f->number_to_wait_for == worker->write_num_messages_written)
1295         {
1296           flushers = g_list_append (flushers, f);
1297           worker->write_pending_flushes = g_list_delete_link (worker->write_pending_flushes, l);
1298         }
1299     }
1300   if (flushers != NULL)
1301     {
1302       g_assert (worker->output_pending == PENDING_NONE);
1303       worker->output_pending = PENDING_FLUSH;
1304     }
1305
1306   if (flushers != NULL)
1307     {
1308       FlushAsyncData *data;
1309
1310       data = g_new0 (FlushAsyncData, 1);
1311       data->worker = _g_dbus_worker_ref (worker);
1312       data->flushers = flushers;
1313       return data;
1314     }
1315
1316   return NULL;
1317 }
1318
1319 /* called in private thread shared by all GDBusConnection instances
1320  *
1321  * write-lock is not held on entry
1322  * output_pending is PENDING_WRITE on entry
1323  */
1324 static void
1325 write_message_cb (GObject       *source_object,
1326                   GAsyncResult  *res,
1327                   gpointer       user_data)
1328 {
1329   MessageToWriteData *data = user_data;
1330   GError *error;
1331
1332   g_mutex_lock (&data->worker->write_lock);
1333   g_assert (data->worker->output_pending == PENDING_WRITE);
1334   data->worker->output_pending = PENDING_NONE;
1335
1336   error = NULL;
1337   if (!write_message_finish (res, &error))
1338     {
1339       g_mutex_unlock (&data->worker->write_lock);
1340
1341       /* TODO: handle */
1342       _g_dbus_worker_emit_disconnected (data->worker, TRUE, error);
1343       g_error_free (error);
1344
1345       g_mutex_lock (&data->worker->write_lock);
1346     }
1347
1348   message_written_unlocked (data->worker, data);
1349
1350   g_mutex_unlock (&data->worker->write_lock);
1351
1352   continue_writing (data->worker);
1353
1354   message_to_write_data_free (data);
1355 }
1356
1357 /* called in private thread shared by all GDBusConnection instances
1358  *
1359  * write-lock is not held on entry
1360  * output_pending is PENDING_CLOSE on entry
1361  */
1362 static void
1363 iostream_close_cb (GObject      *source_object,
1364                    GAsyncResult *res,
1365                    gpointer      user_data)
1366 {
1367   GDBusWorker *worker = user_data;
1368   GError *error = NULL;
1369   GList *pending_close_attempts, *pending_flush_attempts;
1370   GQueue *send_queue;
1371
1372   g_io_stream_close_finish (worker->stream, res, &error);
1373
1374   g_mutex_lock (&worker->write_lock);
1375
1376   pending_close_attempts = worker->pending_close_attempts;
1377   worker->pending_close_attempts = NULL;
1378
1379   pending_flush_attempts = worker->write_pending_flushes;
1380   worker->write_pending_flushes = NULL;
1381
1382   send_queue = worker->write_queue;
1383   worker->write_queue = g_queue_new ();
1384
1385   g_assert (worker->output_pending == PENDING_CLOSE);
1386   worker->output_pending = PENDING_NONE;
1387
1388   g_mutex_unlock (&worker->write_lock);
1389
1390   while (pending_close_attempts != NULL)
1391     {
1392       CloseData *close_data = pending_close_attempts->data;
1393
1394       pending_close_attempts = g_list_delete_link (pending_close_attempts,
1395                                                    pending_close_attempts);
1396
1397       if (close_data->result != NULL)
1398         {
1399           if (error != NULL)
1400             g_simple_async_result_set_from_error (close_data->result, error);
1401
1402           /* this must be in an idle because the result is likely to be
1403            * intended for another thread
1404            */
1405           g_simple_async_result_complete_in_idle (close_data->result);
1406         }
1407
1408       close_data_free (close_data);
1409     }
1410
1411   g_clear_error (&error);
1412
1413   /* all messages queued for sending are discarded */
1414   g_queue_foreach (send_queue, (GFunc) message_to_write_data_free, NULL);
1415   g_queue_free (send_queue);
1416
1417   /* all queued flushes fail */
1418   error = g_error_new (G_IO_ERROR, G_IO_ERROR_CANCELLED,
1419                        _("Operation was cancelled"));
1420   flush_data_list_complete (pending_flush_attempts, error);
1421   g_list_free (pending_flush_attempts);
1422   g_clear_error (&error);
1423
1424   _g_dbus_worker_unref (worker);
1425 }
1426
1427 /* called in private thread shared by all GDBusConnection instances
1428  *
1429  * write-lock is not held on entry
1430  * output_pending must be PENDING_NONE on entry
1431  */
1432 static void
1433 continue_writing (GDBusWorker *worker)
1434 {
1435   MessageToWriteData *data;
1436   FlushAsyncData *flush_async_data;
1437
1438  write_next:
1439   /* we mustn't try to write two things at once */
1440   g_assert (worker->output_pending == PENDING_NONE);
1441
1442   g_mutex_lock (&worker->write_lock);
1443
1444   /* if we want to close the connection, that takes precedence */
1445   if (worker->pending_close_attempts != NULL)
1446     {
1447       worker->close_expected = TRUE;
1448       worker->output_pending = PENDING_CLOSE;
1449
1450       g_io_stream_close_async (worker->stream, G_PRIORITY_DEFAULT,
1451                                NULL, iostream_close_cb,
1452                                _g_dbus_worker_ref (worker));
1453       data = NULL;
1454     }
1455   else
1456     {
1457       flush_async_data = prepare_flush_unlocked (worker);
1458
1459       if (flush_async_data == NULL)
1460         {
1461           data = g_queue_pop_head (worker->write_queue);
1462
1463           if (data != NULL)
1464             worker->output_pending = PENDING_WRITE;
1465         }
1466       else
1467         {
1468           data = NULL;
1469         }
1470     }
1471
1472   g_mutex_unlock (&worker->write_lock);
1473
1474   /* Note that write_lock is only used for protecting the @write_queue
1475    * and @output_pending fields of the GDBusWorker struct ... which we
1476    * need to modify from arbitrary threads in _g_dbus_worker_send_message().
1477    *
1478    * Therefore, it's fine to drop it here when calling back into user
1479    * code and then writing the message out onto the GIOStream since this
1480    * function only runs on the worker thread.
1481    */
1482
1483   if (flush_async_data != NULL)
1484     {
1485       start_flush (flush_async_data);
1486       g_assert (data == NULL);
1487     }
1488   else if (data != NULL)
1489     {
1490       GDBusMessage *old_message;
1491       guchar *new_blob;
1492       gsize new_blob_size;
1493       GError *error;
1494
1495       old_message = data->message;
1496       data->message = _g_dbus_worker_emit_message_about_to_be_sent (worker, data->message);
1497       if (data->message == old_message)
1498         {
1499           /* filters had no effect - do nothing */
1500         }
1501       else if (data->message == NULL)
1502         {
1503           /* filters dropped message */
1504           g_mutex_lock (&worker->write_lock);
1505           worker->output_pending = PENDING_NONE;
1506           g_mutex_unlock (&worker->write_lock);
1507           message_to_write_data_free (data);
1508           goto write_next;
1509         }
1510       else
1511         {
1512           /* filters altered the message -> reencode */
1513           error = NULL;
1514           new_blob = g_dbus_message_to_blob (data->message,
1515                                              &new_blob_size,
1516                                              worker->capabilities,
1517                                              &error);
1518           if (new_blob == NULL)
1519             {
1520               /* if filter make the GDBusMessage unencodeable, just complain on stderr and send
1521                * the old message instead
1522                */
1523               g_warning ("Error encoding GDBusMessage with serial %d altered by filter function: %s",
1524                          g_dbus_message_get_serial (data->message),
1525                          error->message);
1526               g_error_free (error);
1527             }
1528           else
1529             {
1530               g_free (data->blob);
1531               data->blob = (gchar *) new_blob;
1532               data->blob_size = new_blob_size;
1533             }
1534         }
1535
1536       write_message_async (worker,
1537                            data,
1538                            write_message_cb,
1539                            data);
1540     }
1541 }
1542
1543 /* called in private thread shared by all GDBusConnection instances
1544  *
1545  * write-lock is not held on entry
1546  * output_pending may be anything
1547  */
1548 static gboolean
1549 continue_writing_in_idle_cb (gpointer user_data)
1550 {
1551   GDBusWorker *worker = user_data;
1552
1553   /* Because this is the worker thread, we can read this struct member
1554    * without holding the lock: no other thread ever modifies it.
1555    */
1556   if (worker->output_pending == PENDING_NONE)
1557     continue_writing (worker);
1558
1559   return FALSE;
1560 }
1561
1562 /*
1563  * @write_data: (transfer full) (allow-none):
1564  * @flush_data: (transfer full) (allow-none):
1565  * @close_data: (transfer full) (allow-none):
1566  *
1567  * Can be called from any thread
1568  *
1569  * write_lock is held on entry
1570  * output_pending may be anything
1571  */
1572 static void
1573 schedule_writing_unlocked (GDBusWorker        *worker,
1574                            MessageToWriteData *write_data,
1575                            FlushData          *flush_data,
1576                            CloseData          *close_data)
1577 {
1578   if (write_data != NULL)
1579     g_queue_push_tail (worker->write_queue, write_data);
1580
1581   if (flush_data != NULL)
1582     worker->write_pending_flushes = g_list_prepend (worker->write_pending_flushes, flush_data);
1583
1584   if (close_data != NULL)
1585     worker->pending_close_attempts = g_list_prepend (worker->pending_close_attempts,
1586                                                      close_data);
1587
1588   /* If we had output pending, the next bit of output will happen
1589    * automatically when it finishes, so we only need to do this
1590    * if nothing was pending.
1591    *
1592    * The idle callback will re-check that output_pending is still
1593    * PENDING_NONE, to guard against output starting before the idle.
1594    */
1595   if (worker->output_pending == PENDING_NONE)
1596     {
1597       GSource *idle_source;
1598       idle_source = g_idle_source_new ();
1599       g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
1600       g_source_set_callback (idle_source,
1601                              continue_writing_in_idle_cb,
1602                              _g_dbus_worker_ref (worker),
1603                              (GDestroyNotify) _g_dbus_worker_unref);
1604       g_source_attach (idle_source, worker->shared_thread_data->context);
1605       g_source_unref (idle_source);
1606     }
1607 }
1608
1609 /* ---------------------------------------------------------------------------------------------------- */
1610
1611 /* can be called from any thread - steals blob
1612  *
1613  * write_lock is not held on entry
1614  * output_pending may be anything
1615  */
1616 void
1617 _g_dbus_worker_send_message (GDBusWorker    *worker,
1618                              GDBusMessage   *message,
1619                              gchar          *blob,
1620                              gsize           blob_len)
1621 {
1622   MessageToWriteData *data;
1623
1624   g_return_if_fail (G_IS_DBUS_MESSAGE (message));
1625   g_return_if_fail (blob != NULL);
1626   g_return_if_fail (blob_len > 16);
1627
1628   data = g_new0 (MessageToWriteData, 1);
1629   data->worker = _g_dbus_worker_ref (worker);
1630   data->message = g_object_ref (message);
1631   data->blob = blob; /* steal! */
1632   data->blob_size = blob_len;
1633
1634   g_mutex_lock (&worker->write_lock);
1635   schedule_writing_unlocked (worker, data, NULL, NULL);
1636   g_mutex_unlock (&worker->write_lock);
1637 }
1638
1639 /* ---------------------------------------------------------------------------------------------------- */
1640
1641 GDBusWorker *
1642 _g_dbus_worker_new (GIOStream                              *stream,
1643                     GDBusCapabilityFlags                    capabilities,
1644                     gboolean                                initially_frozen,
1645                     GDBusWorkerMessageReceivedCallback      message_received_callback,
1646                     GDBusWorkerMessageAboutToBeSentCallback message_about_to_be_sent_callback,
1647                     GDBusWorkerDisconnectedCallback         disconnected_callback,
1648                     gpointer                                user_data)
1649 {
1650   GDBusWorker *worker;
1651   GSource *idle_source;
1652
1653   g_return_val_if_fail (G_IS_IO_STREAM (stream), NULL);
1654   g_return_val_if_fail (message_received_callback != NULL, NULL);
1655   g_return_val_if_fail (message_about_to_be_sent_callback != NULL, NULL);
1656   g_return_val_if_fail (disconnected_callback != NULL, NULL);
1657
1658   worker = g_new0 (GDBusWorker, 1);
1659   worker->ref_count = 1;
1660
1661   g_mutex_init (&worker->read_lock);
1662   worker->message_received_callback = message_received_callback;
1663   worker->message_about_to_be_sent_callback = message_about_to_be_sent_callback;
1664   worker->disconnected_callback = disconnected_callback;
1665   worker->user_data = user_data;
1666   worker->stream = g_object_ref (stream);
1667   worker->capabilities = capabilities;
1668   worker->cancellable = g_cancellable_new ();
1669   worker->output_pending = PENDING_NONE;
1670
1671   worker->frozen = initially_frozen;
1672   worker->received_messages_while_frozen = g_queue_new ();
1673
1674   g_mutex_init (&worker->write_lock);
1675   worker->write_queue = g_queue_new ();
1676
1677   if (G_IS_SOCKET_CONNECTION (worker->stream))
1678     worker->socket = g_socket_connection_get_socket (G_SOCKET_CONNECTION (worker->stream));
1679
1680   worker->shared_thread_data = _g_dbus_shared_thread_ref ();
1681
1682   /* begin reading */
1683   idle_source = g_idle_source_new ();
1684   g_source_set_priority (idle_source, G_PRIORITY_DEFAULT);
1685   g_source_set_callback (idle_source,
1686                          _g_dbus_worker_do_initial_read,
1687                          _g_dbus_worker_ref (worker),
1688                          (GDestroyNotify) _g_dbus_worker_unref);
1689   g_source_attach (idle_source, worker->shared_thread_data->context);
1690   g_source_unref (idle_source);
1691
1692   return worker;
1693 }
1694
1695 /* ---------------------------------------------------------------------------------------------------- */
1696
1697 /* can be called from any thread
1698  *
1699  * write_lock is not held on entry
1700  * output_pending may be anything
1701  */
1702 void
1703 _g_dbus_worker_close (GDBusWorker         *worker,
1704                       GCancellable        *cancellable,
1705                       GSimpleAsyncResult  *result)
1706 {
1707   CloseData *close_data;
1708
1709   close_data = g_slice_new0 (CloseData);
1710   close_data->worker = _g_dbus_worker_ref (worker);
1711   close_data->cancellable =
1712       (cancellable == NULL ? NULL : g_object_ref (cancellable));
1713   close_data->result = (result == NULL ? NULL : g_object_ref (result));
1714
1715   /* Don't set worker->close_expected here - we're in the wrong thread.
1716    * It'll be set before the actual close happens.
1717    */
1718   g_cancellable_cancel (worker->cancellable);
1719   g_mutex_lock (&worker->write_lock);
1720   schedule_writing_unlocked (worker, NULL, NULL, close_data);
1721   g_mutex_unlock (&worker->write_lock);
1722 }
1723
1724 /* This can be called from any thread - frees worker. Note that
1725  * callbacks might still happen if called from another thread than the
1726  * worker - use your own synchronization primitive in the callbacks.
1727  *
1728  * write_lock is not held on entry
1729  * output_pending may be anything
1730  */
1731 void
1732 _g_dbus_worker_stop (GDBusWorker *worker)
1733 {
1734   g_atomic_int_set (&worker->stopped, TRUE);
1735
1736   /* Cancel any pending operations and schedule a close of the underlying I/O
1737    * stream in the worker thread
1738    */
1739   _g_dbus_worker_close (worker, NULL, NULL);
1740
1741   /* _g_dbus_worker_close holds a ref until after an idle in the the worker
1742    * thread has run, so we no longer need to unref in an idle like in
1743    * commit 322e25b535
1744    */
1745   _g_dbus_worker_unref (worker);
1746 }
1747
1748 /* ---------------------------------------------------------------------------------------------------- */
1749
1750 /* can be called from any thread (except the worker thread) - blocks
1751  * calling thread until all queued outgoing messages are written and
1752  * the transport has been flushed
1753  *
1754  * write_lock is not held on entry
1755  * output_pending may be anything
1756  */
1757 gboolean
1758 _g_dbus_worker_flush_sync (GDBusWorker    *worker,
1759                            GCancellable   *cancellable,
1760                            GError        **error)
1761 {
1762   gboolean ret;
1763   FlushData *data;
1764   guint64 pending_writes;
1765
1766   data = NULL;
1767   ret = TRUE;
1768
1769   g_mutex_lock (&worker->write_lock);
1770
1771   /* if the queue is empty, no write is in-flight and we haven't written
1772    * anything since the last flush, then there's nothing to wait for
1773    */
1774   pending_writes = g_queue_get_length (worker->write_queue);
1775
1776   /* if a write is in-flight, we shouldn't be satisfied until the first
1777    * flush operation that follows it
1778    */
1779   if (worker->output_pending == PENDING_WRITE)
1780     pending_writes += 1;
1781
1782   if (pending_writes > 0 ||
1783       worker->write_num_messages_written != worker->write_num_messages_flushed)
1784     {
1785       data = g_new0 (FlushData, 1);
1786       g_mutex_init (&data->mutex);
1787       g_cond_init (&data->cond);
1788       data->number_to_wait_for = worker->write_num_messages_written + pending_writes;
1789       g_mutex_lock (&data->mutex);
1790
1791       schedule_writing_unlocked (worker, NULL, data, NULL);
1792     }
1793   g_mutex_unlock (&worker->write_lock);
1794
1795   if (data != NULL)
1796     {
1797       g_cond_wait (&data->cond, &data->mutex);
1798       g_mutex_unlock (&data->mutex);
1799
1800       /* note:the element is removed from worker->write_pending_flushes in flush_cb() above */
1801       g_cond_clear (&data->cond);
1802       g_mutex_clear (&data->mutex);
1803       if (data->error != NULL)
1804         {
1805           ret = FALSE;
1806           g_propagate_error (error, data->error);
1807         }
1808       g_free (data);
1809     }
1810
1811   return ret;
1812 }
1813
1814 /* ---------------------------------------------------------------------------------------------------- */
1815
1816 #define G_DBUS_DEBUG_AUTHENTICATION (1<<0)
1817 #define G_DBUS_DEBUG_TRANSPORT      (1<<1)
1818 #define G_DBUS_DEBUG_MESSAGE        (1<<2)
1819 #define G_DBUS_DEBUG_PAYLOAD        (1<<3)
1820 #define G_DBUS_DEBUG_CALL           (1<<4)
1821 #define G_DBUS_DEBUG_SIGNAL         (1<<5)
1822 #define G_DBUS_DEBUG_INCOMING       (1<<6)
1823 #define G_DBUS_DEBUG_RETURN         (1<<7)
1824 #define G_DBUS_DEBUG_EMISSION       (1<<8)
1825 #define G_DBUS_DEBUG_ADDRESS        (1<<9)
1826
1827 static gint _gdbus_debug_flags = 0;
1828
1829 gboolean
1830 _g_dbus_debug_authentication (void)
1831 {
1832   _g_dbus_initialize ();
1833   return (_gdbus_debug_flags & G_DBUS_DEBUG_AUTHENTICATION) != 0;
1834 }
1835
1836 gboolean
1837 _g_dbus_debug_transport (void)
1838 {
1839   _g_dbus_initialize ();
1840   return (_gdbus_debug_flags & G_DBUS_DEBUG_TRANSPORT) != 0;
1841 }
1842
1843 gboolean
1844 _g_dbus_debug_message (void)
1845 {
1846   _g_dbus_initialize ();
1847   return (_gdbus_debug_flags & G_DBUS_DEBUG_MESSAGE) != 0;
1848 }
1849
1850 gboolean
1851 _g_dbus_debug_payload (void)
1852 {
1853   _g_dbus_initialize ();
1854   return (_gdbus_debug_flags & G_DBUS_DEBUG_PAYLOAD) != 0;
1855 }
1856
1857 gboolean
1858 _g_dbus_debug_call (void)
1859 {
1860   _g_dbus_initialize ();
1861   return (_gdbus_debug_flags & G_DBUS_DEBUG_CALL) != 0;
1862 }
1863
1864 gboolean
1865 _g_dbus_debug_signal (void)
1866 {
1867   _g_dbus_initialize ();
1868   return (_gdbus_debug_flags & G_DBUS_DEBUG_SIGNAL) != 0;
1869 }
1870
1871 gboolean
1872 _g_dbus_debug_incoming (void)
1873 {
1874   _g_dbus_initialize ();
1875   return (_gdbus_debug_flags & G_DBUS_DEBUG_INCOMING) != 0;
1876 }
1877
1878 gboolean
1879 _g_dbus_debug_return (void)
1880 {
1881   _g_dbus_initialize ();
1882   return (_gdbus_debug_flags & G_DBUS_DEBUG_RETURN) != 0;
1883 }
1884
1885 gboolean
1886 _g_dbus_debug_emission (void)
1887 {
1888   _g_dbus_initialize ();
1889   return (_gdbus_debug_flags & G_DBUS_DEBUG_EMISSION) != 0;
1890 }
1891
1892 gboolean
1893 _g_dbus_debug_address (void)
1894 {
1895   _g_dbus_initialize ();
1896   return (_gdbus_debug_flags & G_DBUS_DEBUG_ADDRESS) != 0;
1897 }
1898
1899 G_LOCK_DEFINE_STATIC (print_lock);
1900
1901 void
1902 _g_dbus_debug_print_lock (void)
1903 {
1904   G_LOCK (print_lock);
1905 }
1906
1907 void
1908 _g_dbus_debug_print_unlock (void)
1909 {
1910   G_UNLOCK (print_lock);
1911 }
1912
1913 /*
1914  * _g_dbus_initialize:
1915  *
1916  * Does various one-time init things such as
1917  *
1918  *  - registering the G_DBUS_ERROR error domain
1919  *  - parses the G_DBUS_DEBUG environment variable
1920  */
1921 void
1922 _g_dbus_initialize (void)
1923 {
1924   static volatile gsize initialized = 0;
1925
1926   if (g_once_init_enter (&initialized))
1927     {
1928       volatile GQuark g_dbus_error_domain;
1929       const gchar *debug;
1930
1931       g_dbus_error_domain = G_DBUS_ERROR;
1932       (g_dbus_error_domain); /* To avoid -Wunused-but-set-variable */
1933
1934       debug = g_getenv ("G_DBUS_DEBUG");
1935       if (debug != NULL)
1936         {
1937           const GDebugKey keys[] = {
1938             { "authentication", G_DBUS_DEBUG_AUTHENTICATION },
1939             { "transport",      G_DBUS_DEBUG_TRANSPORT      },
1940             { "message",        G_DBUS_DEBUG_MESSAGE        },
1941             { "payload",        G_DBUS_DEBUG_PAYLOAD        },
1942             { "call",           G_DBUS_DEBUG_CALL           },
1943             { "signal",         G_DBUS_DEBUG_SIGNAL         },
1944             { "incoming",       G_DBUS_DEBUG_INCOMING       },
1945             { "return",         G_DBUS_DEBUG_RETURN         },
1946             { "emission",       G_DBUS_DEBUG_EMISSION       },
1947             { "address",        G_DBUS_DEBUG_ADDRESS        }
1948           };
1949
1950           _gdbus_debug_flags = g_parse_debug_string (debug, keys, G_N_ELEMENTS (keys));
1951           if (_gdbus_debug_flags & G_DBUS_DEBUG_PAYLOAD)
1952             _gdbus_debug_flags |= G_DBUS_DEBUG_MESSAGE;
1953         }
1954
1955       g_once_init_leave (&initialized, 1);
1956     }
1957 }
1958
1959 /* ---------------------------------------------------------------------------------------------------- */
1960
1961 GVariantType *
1962 _g_dbus_compute_complete_signature (GDBusArgInfo **args)
1963 {
1964   const GVariantType *arg_types[256];
1965   guint n;
1966
1967   if (args)
1968     for (n = 0; args[n] != NULL; n++)
1969       {
1970         /* DBus places a hard limit of 255 on signature length.
1971          * therefore number of args must be less than 256.
1972          */
1973         g_assert (n < 256);
1974
1975         arg_types[n] = G_VARIANT_TYPE (args[n]->signature);
1976
1977         if G_UNLIKELY (arg_types[n] == NULL)
1978           return NULL;
1979       }
1980   else
1981     n = 0;
1982
1983   return g_variant_type_new_tuple (arg_types, n);
1984 }
1985
1986 /* ---------------------------------------------------------------------------------------------------- */
1987
1988 #ifdef G_OS_WIN32
1989
1990 extern BOOL WINAPI ConvertSidToStringSidA (PSID Sid, LPSTR *StringSid);
1991
1992 gchar *
1993 _g_dbus_win32_get_user_sid (void)
1994 {
1995   HANDLE h;
1996   TOKEN_USER *user;
1997   DWORD token_information_len;
1998   PSID psid;
1999   gchar *sid;
2000   gchar *ret;
2001
2002   ret = NULL;
2003   user = NULL;
2004   h = INVALID_HANDLE_VALUE;
2005
2006   if (!OpenProcessToken (GetCurrentProcess (), TOKEN_QUERY, &h))
2007     {
2008       g_warning ("OpenProcessToken failed with error code %d", (gint) GetLastError ());
2009       goto out;
2010     }
2011
2012   /* Get length of buffer */
2013   token_information_len = 0;
2014   if (!GetTokenInformation (h, TokenUser, NULL, 0, &token_information_len))
2015     {
2016       if (GetLastError () != ERROR_INSUFFICIENT_BUFFER)
2017         {
2018           g_warning ("GetTokenInformation() failed with error code %d", (gint) GetLastError ());
2019           goto out;
2020         }
2021     }
2022   user = g_malloc (token_information_len);
2023   if (!GetTokenInformation (h, TokenUser, user, token_information_len, &token_information_len))
2024     {
2025       g_warning ("GetTokenInformation() failed with error code %d", (gint) GetLastError ());
2026       goto out;
2027     }
2028
2029   psid = user->User.Sid;
2030   if (!IsValidSid (psid))
2031     {
2032       g_warning ("Invalid SID");
2033       goto out;
2034     }
2035
2036   if (!ConvertSidToStringSidA (psid, &sid))
2037     {
2038       g_warning ("Invalid SID");
2039       goto out;
2040     }
2041
2042   ret = g_strdup (sid);
2043   LocalFree (sid);
2044
2045 out:
2046   g_free (user);
2047   if (h != INVALID_HANDLE_VALUE)
2048     CloseHandle (h);
2049   return ret;
2050 }
2051 #endif
2052
2053 /* ---------------------------------------------------------------------------------------------------- */
2054
2055 gchar *
2056 _g_dbus_get_machine_id (GError **error)
2057 {
2058   gchar *ret;
2059   GError *first_error;
2060   /* TODO: use PACKAGE_LOCALSTATEDIR ? */
2061   ret = NULL;
2062   first_error = NULL;
2063   if (!g_file_get_contents ("/var/lib/dbus/machine-id",
2064                             &ret,
2065                             NULL,
2066                             &first_error) &&
2067       !g_file_get_contents ("/etc/machine-id",
2068                             &ret,
2069                             NULL,
2070                             NULL))
2071     {
2072       g_propagate_prefixed_error (error, first_error,
2073                                   _("Unable to load /var/lib/dbus/machine-id or /etc/machine-id: "));
2074     }
2075   else
2076     {
2077       /* ignore the error from the first try, if any */
2078       g_clear_error (&first_error);
2079       /* TODO: validate value */
2080       g_strstrip (ret);
2081     }
2082   return ret;
2083 }
2084
2085 /* ---------------------------------------------------------------------------------------------------- */
2086
2087 gchar *
2088 _g_dbus_enum_to_string (GType enum_type, gint value)
2089 {
2090   gchar *ret;
2091   GEnumClass *klass;
2092   GEnumValue *enum_value;
2093
2094   klass = g_type_class_ref (enum_type);
2095   enum_value = g_enum_get_value (klass, value);
2096   if (enum_value != NULL)
2097     ret = g_strdup (enum_value->value_nick);
2098   else
2099     ret = g_strdup_printf ("unknown (value %d)", value);
2100   g_type_class_unref (klass);
2101   return ret;
2102 }
2103
2104 /* ---------------------------------------------------------------------------------------------------- */
2105
2106 static void
2107 write_message_print_transport_debug (gssize bytes_written,
2108                                      MessageToWriteData *data)
2109 {
2110   if (G_LIKELY (!_g_dbus_debug_transport ()))
2111     goto out;
2112
2113   _g_dbus_debug_print_lock ();
2114   g_print ("========================================================================\n"
2115            "GDBus-debug:Transport:\n"
2116            "  >>>> WROTE %" G_GSIZE_FORMAT " bytes of message with serial %d and\n"
2117            "       size %" G_GSIZE_FORMAT " from offset %" G_GSIZE_FORMAT " on a %s\n",
2118            bytes_written,
2119            g_dbus_message_get_serial (data->message),
2120            data->blob_size,
2121            data->total_written,
2122            g_type_name (G_TYPE_FROM_INSTANCE (g_io_stream_get_output_stream (data->worker->stream))));
2123   _g_dbus_debug_print_unlock ();
2124  out:
2125   ;
2126 }
2127
2128 /* ---------------------------------------------------------------------------------------------------- */
2129
2130 static void
2131 read_message_print_transport_debug (gssize bytes_read,
2132                                     GDBusWorker *worker)
2133 {
2134   gsize size;
2135   gint32 serial;
2136   gint32 message_length;
2137
2138   if (G_LIKELY (!_g_dbus_debug_transport ()))
2139     goto out;
2140
2141   size = bytes_read + worker->read_buffer_cur_size;
2142   serial = 0;
2143   message_length = 0;
2144   if (size >= 16)
2145     message_length = g_dbus_message_bytes_needed ((guchar *) worker->read_buffer, size, NULL);
2146   if (size >= 1)
2147     {
2148       switch (worker->read_buffer[0])
2149         {
2150         case 'l':
2151           if (size >= 12)
2152             serial = GUINT32_FROM_LE (((guint32 *) worker->read_buffer)[2]);
2153           break;
2154         case 'B':
2155           if (size >= 12)
2156             serial = GUINT32_FROM_BE (((guint32 *) worker->read_buffer)[2]);
2157           break;
2158         default:
2159           /* an error will be set elsewhere if this happens */
2160           goto out;
2161         }
2162     }
2163
2164     _g_dbus_debug_print_lock ();
2165   g_print ("========================================================================\n"
2166            "GDBus-debug:Transport:\n"
2167            "  <<<< READ %" G_GSIZE_FORMAT " bytes of message with serial %d and\n"
2168            "       size %d to offset %" G_GSIZE_FORMAT " from a %s\n",
2169            bytes_read,
2170            serial,
2171            message_length,
2172            worker->read_buffer_cur_size,
2173            g_type_name (G_TYPE_FROM_INSTANCE (g_io_stream_get_input_stream (worker->stream))));
2174   _g_dbus_debug_print_unlock ();
2175  out:
2176   ;
2177 }
2178
2179 /* ---------------------------------------------------------------------------------------------------- */
2180
2181 gboolean
2182 _g_signal_accumulator_false_handled (GSignalInvocationHint *ihint,
2183                                      GValue                *return_accu,
2184                                      const GValue          *handler_return,
2185                                      gpointer               dummy)
2186 {
2187   gboolean continue_emission;
2188   gboolean signal_return;
2189
2190   signal_return = g_value_get_boolean (handler_return);
2191   g_value_set_boolean (return_accu, signal_return);
2192   continue_emission = signal_return;
2193
2194   return continue_emission;
2195 }