gio/gfileenumerator.c

   1 /* GIO - GLib Input, Output and Streaming Library
   2  *
   3  * Copyright (C) 2006-2007 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: Alexander Larsson <alexl@redhat.com>
  21  */
  22
  23 #include "config.h"
  24 #include "gfileenumerator.h"
  25 #include "gfile.h"
  26 #include "gioscheduler.h"
  27 #include "gasyncresult.h"
  28 #include "gasynchelper.h"
  29 #include "gsimpleasyncresult.h"
  30 #include "gioerror.h"
  31 #include "glibintl.h"
  32
  33
  34 /**
  35  * SECTION:gfileenumerator
  36  * @short_description: Enumerated Files Routines
  37  * @include: gio/gio.h
  38  *
  39  * #GFileEnumerator allows you to operate on a set of #GFile<!-- -->s,
  40  * returning a #GFileInfo structure for each file enumerated (e.g.
  41  * g_file_enumerate_children() will return a #GFileEnumerator for each
  42  * of the children within a directory).
  43  *
  44  * To get the next file's information from a #GFileEnumerator, use
  45  * g_file_enumerator_next_file() or its asynchronous version,
  46  * g_file_enumerator_next_files_async(). Note that the asynchronous
  47  * version will return a list of #GFileInfo<!---->s, whereas the
  48  * synchronous will only return the next file in the enumerator.
  49  *
  50  * To close a #GFileEnumerator, use g_file_enumerator_close(), or
  51  * its asynchronous version, g_file_enumerator_close_async(). Once
  52  * a #GFileEnumerator is closed, no further actions may be performed
  53  * on it, and it should be freed with g_object_unref().
  54  *
  55  **/
  56
  57 G_DEFINE_TYPE (GFileEnumerator, g_file_enumerator, G_TYPE_OBJECT);
  58
  59 struct _GFileEnumeratorPrivate {
  60   /* TODO: Should be public for subclasses? */
  61   GFile *container;
  62   guint closed : 1;
  63   guint pending : 1;
  64   GAsyncReadyCallback outstanding_callback;
  65   GError *outstanding_error;
  66 };
  67
  68 enum {
  69   PROP_0,
  70   PROP_CONTAINER
  71 };
  72
  73 static void     g_file_enumerator_real_next_files_async  (GFileEnumerator      *enumerator,
  74                                                           int                   num_files,
  75                                                           int                   io_priority,
  76                                                           GCancellable         *cancellable,
  77                                                           GAsyncReadyCallback   callback,
  78                                                           gpointer              user_data);
  79 static GList *  g_file_enumerator_real_next_files_finish (GFileEnumerator      *enumerator,
  80                                                           GAsyncResult         *res,
  81                                                           GError              **error);
  82 static void     g_file_enumerator_real_close_async       (GFileEnumerator      *enumerator,
  83                                                           int                   io_priority,
  84                                                           GCancellable         *cancellable,
  85                                                           GAsyncReadyCallback   callback,
  86                                                           gpointer              user_data);
  87 static gboolean g_file_enumerator_real_close_finish      (GFileEnumerator      *enumerator,
  88                                                           GAsyncResult         *res,
  89                                                           GError              **error);
  90
  91 static void
  92 g_file_enumerator_set_property (GObject      *object,
  93                                 guint         property_id,
  94                                 const GValue *value,
  95                                 GParamSpec   *pspec)
  96 {
  97   GFileEnumerator *enumerator;
  98
  99   enumerator = G_FILE_ENUMERATOR (object);
 100
 101   switch (property_id) {
 102   case PROP_CONTAINER:
 103     enumerator->priv->container = g_value_dup_object (value);
 104     break;
 105   default:
 106     G_OBJECT_WARN_INVALID_PROPERTY_ID (object, property_id, pspec);
 107     break;
 108   }
 109 }
 110
 111 static void
 112 g_file_enumerator_dispose (GObject *object)
 113 {
 114   GFileEnumerator *enumerator;
 115
 116   enumerator = G_FILE_ENUMERATOR (object);
 117
 118   if (enumerator->priv->container) {
 119     g_object_unref (enumerator->priv->container);
 120     enumerator->priv->container = NULL;
 121   }
 122
 123   G_OBJECT_CLASS (g_file_enumerator_parent_class)->dispose (object);
 124 }
 125
 126 static void
 127 g_file_enumerator_finalize (GObject *object)
 128 {
 129   GFileEnumerator *enumerator;
 130
 131   enumerator = G_FILE_ENUMERATOR (object);
 132
 133   if (!enumerator->priv->closed)
 134     g_file_enumerator_close (enumerator, NULL, NULL);
 135
 136   G_OBJECT_CLASS (g_file_enumerator_parent_class)->finalize (object);
 137 }
 138
 139 static void
 140 g_file_enumerator_class_init (GFileEnumeratorClass *klass)
 141 {
 142   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 143
 144   g_type_class_add_private (klass, sizeof (GFileEnumeratorPrivate));
 145
 146   gobject_class->set_property = g_file_enumerator_set_property;
 147   gobject_class->dispose = g_file_enumerator_dispose;
 148   gobject_class->finalize = g_file_enumerator_finalize;
 149
 150   klass->next_files_async = g_file_enumerator_real_next_files_async;
 151   klass->next_files_finish = g_file_enumerator_real_next_files_finish;
 152   klass->close_async = g_file_enumerator_real_close_async;
 153   klass->close_finish = g_file_enumerator_real_close_finish;
 154
 155   g_object_class_install_property
 156     (gobject_class, PROP_CONTAINER,
 157      g_param_spec_object ("container", P_("Container"),
 158                           P_("The container that is being enumerated"),
 159                           G_TYPE_FILE,
 160                           G_PARAM_WRITABLE |
 161                           G_PARAM_CONSTRUCT_ONLY |
 162                           G_PARAM_STATIC_STRINGS));
 163 }
 164
 165 static void
 166 g_file_enumerator_init (GFileEnumerator *enumerator)
 167 {
 168   enumerator->priv = G_TYPE_INSTANCE_GET_PRIVATE (enumerator,
 169                                                   G_TYPE_FILE_ENUMERATOR,
 170                                                   GFileEnumeratorPrivate);
 171 }
 172
 173 /**
 174  * g_file_enumerator_next_file:
 175  * @enumerator: a #GFileEnumerator.
 176  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 177  * @error: location to store the error occurring, or %NULL to ignore
 178  *
 179  * Returns information for the next file in the enumerated object.
 180  * Will block until the information is available. The #GFileInfo
 181  * returned from this function will contain attributes that match the
 182  * attribute string that was passed when the #GFileEnumerator was created.
 183  *
 184  * On error, returns %NULL and sets @error to the error. If the
 185  * enumerator is at the end, %NULL will be returned and @error will
 186  * be unset.
 187  *
 188  * Return value: (transfer full): A #GFileInfo or %NULL on error or end of enumerator.
 189  *    Free the returned object with g_object_unref() when no longer needed.
 190  **/
 191 GFileInfo *
 192 g_file_enumerator_next_file (GFileEnumerator *enumerator,
 193                              GCancellable *cancellable,
 194                              GError **error)
 195 {
 196   GFileEnumeratorClass *class;
 197   GFileInfo *info;
 198
 199   g_return_val_if_fail (G_IS_FILE_ENUMERATOR (enumerator), NULL);
 200   g_return_val_if_fail (enumerator != NULL, NULL);
 201
 202   if (enumerator->priv->closed)
 203     {
 204       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_CLOSED,
 205                            _("Enumerator is closed"));
 206       return NULL;
 207     }
 208
 209   if (enumerator->priv->pending)
 210     {
 211       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PENDING,
 212                            _("File enumerator has outstanding operation"));
 213       return NULL;
 214     }
 215
 216   if (enumerator->priv->outstanding_error)
 217     {
 218       g_propagate_error (error, enumerator->priv->outstanding_error);
 219       enumerator->priv->outstanding_error = NULL;
 220       return NULL;
 221     }
 222
 223   class = G_FILE_ENUMERATOR_GET_CLASS (enumerator);
 224
 225   if (cancellable)
 226     g_cancellable_push_current (cancellable);
 227
 228   enumerator->priv->pending = TRUE;
 229   info = (* class->next_file) (enumerator, cancellable, error);
 230   enumerator->priv->pending = FALSE;
 231
 232   if (cancellable)
 233     g_cancellable_pop_current (cancellable);
 234
 235   return info;
 236 }
 237
 238 /**
 239  * g_file_enumerator_close:
 240  * @enumerator: a #GFileEnumerator.
 241  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 242  * @error: location to store the error occurring, or %NULL to ignore
 243  *
 244  * Releases all resources used by this enumerator, making the
 245  * enumerator return %G_IO_ERROR_CLOSED on all calls.
 246  *
 247  * This will be automatically called when the last reference
 248  * is dropped, but you might want to call this function to make
 249  * sure resources are released as early as possible.
 250  *
 251  * Return value: #TRUE on success or #FALSE on error.
 252  **/
 253 gboolean
 254 g_file_enumerator_close (GFileEnumerator  *enumerator,
 255                          GCancellable     *cancellable,
 256                          GError          **error)
 257 {
 258   GFileEnumeratorClass *class;
 259
 260   g_return_val_if_fail (G_IS_FILE_ENUMERATOR (enumerator), FALSE);
 261   g_return_val_if_fail (enumerator != NULL, FALSE);
 262
 263   class = G_FILE_ENUMERATOR_GET_CLASS (enumerator);
 264
 265   if (enumerator->priv->closed)
 266     return TRUE;
 267
 268   if (enumerator->priv->pending)
 269     {
 270       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PENDING,
 271                            _("File enumerator has outstanding operation"));
 272       return FALSE;
 273     }
 274
 275   if (cancellable)
 276     g_cancellable_push_current (cancellable);
 277
 278   enumerator->priv->pending = TRUE;
 279   (* class->close_fn) (enumerator, cancellable, error);
 280   enumerator->priv->pending = FALSE;
 281   enumerator->priv->closed = TRUE;
 282
 283   if (cancellable)
 284     g_cancellable_pop_current (cancellable);
 285
 286   return TRUE;
 287 }
 288
 289 static void
 290 next_async_callback_wrapper (GObject      *source_object,
 291                              GAsyncResult *res,
 292                              gpointer      user_data)
 293 {
 294   GFileEnumerator *enumerator = G_FILE_ENUMERATOR (source_object);
 295
 296   enumerator->priv->pending = FALSE;
 297   if (enumerator->priv->outstanding_callback)
 298     (*enumerator->priv->outstanding_callback) (source_object, res, user_data);
 299   g_object_unref (enumerator);
 300 }
 301
 302 /**
 303  * g_file_enumerator_next_files_async:
 304  * @enumerator: a #GFileEnumerator.
 305  * @num_files: the number of file info objects to request
 306  * @io_priority: the <link linkend="gioscheduler">io priority</link>
 307  *     of the request.
 308  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 309  * @callback: (scope async): a #GAsyncReadyCallback to call when the request is satisfied
 310  * @user_data: (closure): the data to pass to callback function
 311  *
 312  * Request information for a number of files from the enumerator asynchronously.
 313  * When all i/o for the operation is finished the @callback will be called with
 314  * the requested information.
 315  *
 316  * The callback can be called with less than @num_files files in case of error
 317  * or at the end of the enumerator. In case of a partial error the callback will
 318  * be called with any succeeding items and no error, and on the next request the
 319  * error will be reported. If a request is cancelled the callback will be called
 320  * with %G_IO_ERROR_CANCELLED.
 321  *
 322  * During an async request no other sync and async calls are allowed, and will
 323  * result in %G_IO_ERROR_PENDING errors.
 324  *
 325  * Any outstanding i/o request with higher priority (lower numerical value) will
 326  * be executed before an outstanding request with lower priority. Default
 327  * priority is %G_PRIORITY_DEFAULT.
 328  **/
 329 void
 330 g_file_enumerator_next_files_async (GFileEnumerator     *enumerator,
 331                                     int                  num_files,
 332                                     int                  io_priority,
 333                                     GCancellable        *cancellable,
 334                                     GAsyncReadyCallback  callback,
 335                                     gpointer             user_data)
 336 {
 337   GFileEnumeratorClass *class;
 338   GSimpleAsyncResult *simple;
 339
 340   g_return_if_fail (G_IS_FILE_ENUMERATOR (enumerator));
 341   g_return_if_fail (enumerator != NULL);
 342   g_return_if_fail (num_files >= 0);
 343
 344   if (num_files == 0)
 345     {
 346       simple = g_simple_async_result_new (G_OBJECT (enumerator),
 347                                           callback,
 348                                           user_data,
 349                                           g_file_enumerator_next_files_async);
 350       g_simple_async_result_complete_in_idle (simple);
 351       g_object_unref (simple);
 352       return;
 353     }
 354
 355   if (enumerator->priv->closed)
 356     {
 357       g_simple_async_report_error_in_idle (G_OBJECT (enumerator),
 358                                            callback,
 359                                            user_data,
 360                                            G_IO_ERROR, G_IO_ERROR_CLOSED,
 361                                            _("File enumerator is already closed"));
 362       return;
 363     }
 364
 365   if (enumerator->priv->pending)
 366     {
 367       g_simple_async_report_error_in_idle (G_OBJECT (enumerator),
 368                                            callback,
 369                                            user_data,
 370                                            G_IO_ERROR, G_IO_ERROR_PENDING,
 371                                            _("File enumerator has outstanding operation"));
 372       return;
 373     }
 374
 375   class = G_FILE_ENUMERATOR_GET_CLASS (enumerator);
 376
 377   enumerator->priv->pending = TRUE;
 378   enumerator->priv->outstanding_callback = callback;
 379   g_object_ref (enumerator);
 380   (* class->next_files_async) (enumerator, num_files, io_priority, cancellable,
 381                                next_async_callback_wrapper, user_data);
 382 }
 383
 384 /**
 385  * g_file_enumerator_next_files_finish:
 386  * @enumerator: a #GFileEnumerator.
 387  * @result: a #GAsyncResult.
 388  * @error: a #GError location to store the error occurring, or %NULL to
 389  * ignore.
 390  *
 391  * Finishes the asynchronous operation started with g_file_enumerator_next_files_async().
 392  *
 393  * Returns: (transfer full) (element-type Gio.FileInfo): a #GList of #GFileInfo<!---->s. You must free the list with
 394  *     g_list_free() and unref the infos with g_object_unref() when you're
 395  *     done with them.
 396  **/
 397 GList *
 398 g_file_enumerator_next_files_finish (GFileEnumerator  *enumerator,
 399                                      GAsyncResult     *result,
 400                                      GError          **error)
 401 {
 402   GFileEnumeratorClass *class;
 403   GSimpleAsyncResult *simple;
 404
 405   g_return_val_if_fail (G_IS_FILE_ENUMERATOR (enumerator), NULL);
 406   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), NULL);
 407
 408   if (G_IS_SIMPLE_ASYNC_RESULT (result))
 409     {
 410       simple = G_SIMPLE_ASYNC_RESULT (result);
 411       if (g_simple_async_result_propagate_error (simple, error))
 412         return NULL;
 413
 414       /* Special case read of 0 files */
 415       if (g_simple_async_result_get_source_tag (simple) == g_file_enumerator_next_files_async)
 416         return NULL;
 417     }
 418
 419   class = G_FILE_ENUMERATOR_GET_CLASS (enumerator);
 420   return class->next_files_finish (enumerator, result, error);
 421 }
 422
 423 static void
 424 close_async_callback_wrapper (GObject      *source_object,
 425                               GAsyncResult *res,
 426                               gpointer      user_data)
 427 {
 428   GFileEnumerator *enumerator = G_FILE_ENUMERATOR (source_object);
 429
 430   enumerator->priv->pending = FALSE;
 431   enumerator->priv->closed = TRUE;
 432   if (enumerator->priv->outstanding_callback)
 433     (*enumerator->priv->outstanding_callback) (source_object, res, user_data);
 434   g_object_unref (enumerator);
 435 }
 436
 437 /**
 438  * g_file_enumerator_close_async:
 439  * @enumerator: a #GFileEnumerator.
 440  * @io_priority: the <link linkend="io-priority">I/O priority</link>
 441  *     of the request.
 442  * @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
 443  * @callback: (scope async): a #GAsyncReadyCallback to call when the request is satisfied
 444  * @user_data: (closure): the data to pass to callback function
 445  *
 446  * Asynchronously closes the file enumerator.
 447  *
 448  * If @cancellable is not %NULL, then the operation can be cancelled by
 449  * triggering the cancellable object from another thread. If the operation
 450  * was cancelled, the error %G_IO_ERROR_CANCELLED will be returned in
 451  * g_file_enumerator_close_finish().
 452  **/
 453 void
 454 g_file_enumerator_close_async (GFileEnumerator     *enumerator,
 455                                int                  io_priority,
 456                                GCancellable        *cancellable,
 457                                GAsyncReadyCallback  callback,
 458                                gpointer             user_data)
 459 {
 460   GFileEnumeratorClass *class;
 461
 462   g_return_if_fail (G_IS_FILE_ENUMERATOR (enumerator));
 463
 464   if (enumerator->priv->closed)
 465     {
 466       g_simple_async_report_error_in_idle (G_OBJECT (enumerator),
 467                                            callback,
 468                                            user_data,
 469                                            G_IO_ERROR, G_IO_ERROR_CLOSED,
 470                                            _("File enumerator is already closed"));
 471       return;
 472     }
 473
 474   if (enumerator->priv->pending)
 475     {
 476       g_simple_async_report_error_in_idle (G_OBJECT (enumerator),
 477                                            callback,
 478                                            user_data,
 479                                            G_IO_ERROR, G_IO_ERROR_PENDING,
 480                                            _("File enumerator has outstanding operation"));
 481       return;
 482     }
 483
 484   class = G_FILE_ENUMERATOR_GET_CLASS (enumerator);
 485
 486   enumerator->priv->pending = TRUE;
 487   enumerator->priv->outstanding_callback = callback;
 488   g_object_ref (enumerator);
 489   (* class->close_async) (enumerator, io_priority, cancellable,
 490                           close_async_callback_wrapper, user_data);
 491 }
 492
 493 /**
 494  * g_file_enumerator_close_finish:
 495  * @enumerator: a #GFileEnumerator.
 496  * @result: a #GAsyncResult.
 497  * @error: a #GError location to store the error occurring, or %NULL to
 498  * ignore.
 499  *
 500  * Finishes closing a file enumerator, started from g_file_enumerator_close_async().
 501  *
 502  * If the file enumerator was already closed when g_file_enumerator_close_async()
 503  * was called, then this function will report %G_IO_ERROR_CLOSED in @error, and
 504  * return %FALSE. If the file enumerator had pending operation when the close
 505  * operation was started, then this function will report %G_IO_ERROR_PENDING, and
 506  * return %FALSE.  If @cancellable was not %NULL, then the operation may have been
 507  * cancelled by triggering the cancellable object from another thread. If the operation
 508  * was cancelled, the error %G_IO_ERROR_CANCELLED will be set, and %FALSE will be
 509  * returned.
 510  *
 511  * Returns: %TRUE if the close operation has finished successfully.
 512  **/
 513 gboolean
 514 g_file_enumerator_close_finish (GFileEnumerator  *enumerator,
 515                                 GAsyncResult     *result,
 516                                 GError          **error)
 517 {
 518   GSimpleAsyncResult *simple;
 519   GFileEnumeratorClass *class;
 520
 521   g_return_val_if_fail (G_IS_FILE_ENUMERATOR (enumerator), FALSE);
 522   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
 523
 524   if (G_IS_SIMPLE_ASYNC_RESULT (result))
 525     {
 526       simple = G_SIMPLE_ASYNC_RESULT (result);
 527       if (g_simple_async_result_propagate_error (simple, error))
 528         return FALSE;
 529     }
 530
 531   class = G_FILE_ENUMERATOR_GET_CLASS (enumerator);
 532   return class->close_finish (enumerator, result, error);
 533 }
 534
 535 /**
 536  * g_file_enumerator_is_closed:
 537  * @enumerator: a #GFileEnumerator.
 538  *
 539  * Checks if the file enumerator has been closed.
 540  *
 541  * Returns: %TRUE if the @enumerator is closed.
 542  **/
 543 gboolean
 544 g_file_enumerator_is_closed (GFileEnumerator *enumerator)
 545 {
 546   g_return_val_if_fail (G_IS_FILE_ENUMERATOR (enumerator), TRUE);
 547
 548   return enumerator->priv->closed;
 549 }
 550
 551 /**
 552  * g_file_enumerator_has_pending:
 553  * @enumerator: a #GFileEnumerator.
 554  *
 555  * Checks if the file enumerator has pending operations.
 556  *
 557  * Returns: %TRUE if the @enumerator has pending operations.
 558  **/
 559 gboolean
 560 g_file_enumerator_has_pending (GFileEnumerator *enumerator)
 561 {
 562   g_return_val_if_fail (G_IS_FILE_ENUMERATOR (enumerator), TRUE);
 563
 564   return enumerator->priv->pending;
 565 }
 566
 567 /**
 568  * g_file_enumerator_set_pending:
 569  * @enumerator: a #GFileEnumerator.
 570  * @pending: a boolean value.
 571  *
 572  * Sets the file enumerator as having pending operations.
 573  **/
 574 void
 575 g_file_enumerator_set_pending (GFileEnumerator *enumerator,
 576                                gboolean         pending)
 577 {
 578   g_return_if_fail (G_IS_FILE_ENUMERATOR (enumerator));
 579
 580   enumerator->priv->pending = pending;
 581 }
 582
 583 /**
 584  * g_file_enumerator_get_container:
 585  * @enumerator: a #GFileEnumerator
 586  *
 587  * Get the #GFile container which is being enumerated.
 588  *
 589  * Returns: (transfer none): the #GFile which is being enumerated.
 590  *
 591  * Since: 2.18
 592  */
 593 GFile *
 594 g_file_enumerator_get_container (GFileEnumerator *enumerator)
 595 {
 596   g_return_val_if_fail (G_IS_FILE_ENUMERATOR (enumerator), NULL);
 597
 598   return enumerator->priv->container;
 599 }
 600
 601 typedef struct {
 602   int                num_files;
 603   GList             *files;
 604 } NextAsyncOp;
 605
 606 static void
 607 next_async_op_free (NextAsyncOp *op)
 608 {
 609   /* Free the list, if finish wasn't called */
 610   g_list_free_full (op->files, g_object_unref);
 611
 612   g_free (op);
 613 }
 614
 615
 616
 617 static void
 618 next_files_thread (GSimpleAsyncResult *res,
 619                    GObject            *object,
 620                    GCancellable       *cancellable)
 621 {
 622   NextAsyncOp *op;
 623   GFileEnumeratorClass *class;
 624   GError *error = NULL;
 625   GFileInfo *info;
 626   GFileEnumerator *enumerator;
 627   int i;
 628
 629   enumerator = G_FILE_ENUMERATOR (object);
 630   op = g_simple_async_result_get_op_res_gpointer (res);
 631
 632   class = G_FILE_ENUMERATOR_GET_CLASS (object);
 633
 634   for (i = 0; i < op->num_files; i++)
 635     {
 636       if (g_cancellable_set_error_if_cancelled (cancellable, &error))
 637         info = NULL;
 638       else
 639         info = class->next_file (enumerator, cancellable, &error);
 640
 641       if (info == NULL)
 642         {
 643           /* If we get an error after first file, return that on next operation */
 644           if (error != NULL && i > 0)
 645             {
 646               if (error->domain == G_IO_ERROR &&
 647                   error->code == G_IO_ERROR_CANCELLED)
 648                 g_error_free (error); /* Never propagate cancel errors to other call */
 649               else
 650                 enumerator->priv->outstanding_error = error;
 651               error = NULL;
 652             }
 653
 654           break;
 655         }
 656       else
 657         op->files = g_list_prepend (op->files, info);
 658     }
 659 }
 660
 661 static void
 662 g_file_enumerator_real_next_files_async (GFileEnumerator     *enumerator,
 663                                          int                  num_files,
 664                                          int                  io_priority,
 665                                          GCancellable        *cancellable,
 666                                          GAsyncReadyCallback  callback,
 667                                          gpointer             user_data)
 668 {
 669   GSimpleAsyncResult *res;
 670   NextAsyncOp *op;
 671
 672   op = g_new0 (NextAsyncOp, 1);
 673
 674   op->num_files = num_files;
 675   op->files = NULL;
 676
 677   res = g_simple_async_result_new (G_OBJECT (enumerator), callback, user_data, g_file_enumerator_real_next_files_async);
 678   g_simple_async_result_set_op_res_gpointer (res, op, (GDestroyNotify) next_async_op_free);
 679
 680   g_simple_async_result_run_in_thread (res, next_files_thread, io_priority, cancellable);
 681   g_object_unref (res);
 682 }
 683
 684 static GList *
 685 g_file_enumerator_real_next_files_finish (GFileEnumerator                *enumerator,
 686                                           GAsyncResult                   *result,
 687                                           GError                        **error)
 688 {
 689   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
 690   NextAsyncOp *op;
 691   GList *res;
 692
 693   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) ==
 694             g_file_enumerator_real_next_files_async);
 695
 696   op = g_simple_async_result_get_op_res_gpointer (simple);
 697
 698   res = op->files;
 699   op->files = NULL;
 700   return res;
 701 }
 702
 703 static void
 704 close_async_thread (GSimpleAsyncResult *res,
 705                     GObject            *object,
 706                     GCancellable       *cancellable)
 707 {
 708   GFileEnumeratorClass *class;
 709   GError *error = NULL;
 710   gboolean result;
 711
 712   /* Auto handling of cancelation disabled, and ignore
 713      cancellation, since we want to close things anyway, although
 714      possibly in a quick-n-dirty way. At least we never want to leak
 715      open handles */
 716
 717   class = G_FILE_ENUMERATOR_GET_CLASS (object);
 718   result = class->close_fn (G_FILE_ENUMERATOR (object), cancellable, &error);
 719   if (!result)
 720     g_simple_async_result_take_error (res, error);
 721 }
 722
 723
 724 static void
 725 g_file_enumerator_real_close_async (GFileEnumerator     *enumerator,
 726                                     int                  io_priority,
 727                                     GCancellable        *cancellable,
 728                                     GAsyncReadyCallback  callback,
 729                                     gpointer             user_data)
 730 {
 731   GSimpleAsyncResult *res;
 732
 733   res = g_simple_async_result_new (G_OBJECT (enumerator),
 734                                    callback,
 735                                    user_data,
 736                                    g_file_enumerator_real_close_async);
 737
 738   g_simple_async_result_set_handle_cancellation (res, FALSE);
 739
 740   g_simple_async_result_run_in_thread (res,
 741                                        close_async_thread,
 742                                        io_priority,
 743                                        cancellable);
 744   g_object_unref (res);
 745 }
 746
 747 static gboolean
 748 g_file_enumerator_real_close_finish (GFileEnumerator  *enumerator,
 749                                      GAsyncResult     *result,
 750                                      GError          **error)
 751 {
 752   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
 753   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) ==
 754             g_file_enumerator_real_close_async);
 755   return TRUE;
 756 }