gio/goutputstream.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 "goutputstream.h"
  25 #include "gcancellable.h"
  26 #include "gasyncresult.h"
  27 #include "gsimpleasyncresult.h"
  28 #include "ginputstream.h"
  29 #include "gioerror.h"
  30 #include "glibintl.h"
  31
  32 #include "gioalias.h"
  33
  34 /**
  35  * SECTION:goutputstream
  36  * @short_description: Base class for implementing streaming output
  37  * @include: gio/gio.h
  38  *
  39  * GOutputStream has functions to write to a stream (g_output_stream_write()),
  40  * to close a stream (g_output_stream_close()) and to flush pending writes
  41  * (g_output_stream_flush()).
  42  *
  43  * To copy the content of an input stream to an output stream without
  44  * manually handling the reads and writes, use g_output_stream_splice().
  45  *
  46  * All of these functions have async variants too.
  47  **/
  48
  49 G_DEFINE_TYPE (GOutputStream, g_output_stream, G_TYPE_OBJECT);
  50
  51 struct _GOutputStreamPrivate {
  52   guint closed : 1;
  53   guint pending : 1;
  54   guint closing : 1;
  55   GAsyncReadyCallback outstanding_callback;
  56 };
  57
  58 static gssize   g_output_stream_real_splice        (GOutputStream             *stream,
  59                                                     GInputStream              *source,
  60                                                     GOutputStreamSpliceFlags   flags,
  61                                                     GCancellable              *cancellable,
  62                                                     GError                   **error);
  63 static void     g_output_stream_real_write_async   (GOutputStream             *stream,
  64                                                     const void                *buffer,
  65                                                     gsize                      count,
  66                                                     int                        io_priority,
  67                                                     GCancellable              *cancellable,
  68                                                     GAsyncReadyCallback        callback,
  69                                                     gpointer                   data);
  70 static gssize   g_output_stream_real_write_finish  (GOutputStream             *stream,
  71                                                     GAsyncResult              *result,
  72                                                     GError                   **error);
  73 static void     g_output_stream_real_splice_async  (GOutputStream             *stream,
  74                                                     GInputStream              *source,
  75                                                     GOutputStreamSpliceFlags   flags,
  76                                                     int                        io_priority,
  77                                                     GCancellable              *cancellable,
  78                                                     GAsyncReadyCallback        callback,
  79                                                     gpointer                   data);
  80 static gssize   g_output_stream_real_splice_finish (GOutputStream             *stream,
  81                                                     GAsyncResult              *result,
  82                                                     GError                   **error);
  83 static void     g_output_stream_real_flush_async   (GOutputStream             *stream,
  84                                                     int                        io_priority,
  85                                                     GCancellable              *cancellable,
  86                                                     GAsyncReadyCallback        callback,
  87                                                     gpointer                   data);
  88 static gboolean g_output_stream_real_flush_finish  (GOutputStream             *stream,
  89                                                     GAsyncResult              *result,
  90                                                     GError                   **error);
  91 static void     g_output_stream_real_close_async   (GOutputStream             *stream,
  92                                                     int                        io_priority,
  93                                                     GCancellable              *cancellable,
  94                                                     GAsyncReadyCallback        callback,
  95                                                     gpointer                   data);
  96 static gboolean g_output_stream_real_close_finish  (GOutputStream             *stream,
  97                                                     GAsyncResult              *result,
  98                                                     GError                   **error);
  99
 100 static void
 101 g_output_stream_finalize (GObject *object)
 102 {
 103   G_OBJECT_CLASS (g_output_stream_parent_class)->finalize (object);
 104 }
 105
 106 static void
 107 g_output_stream_dispose (GObject *object)
 108 {
 109   GOutputStream *stream;
 110
 111   stream = G_OUTPUT_STREAM (object);
 112
 113   if (!stream->priv->closed)
 114     g_output_stream_close (stream, NULL, NULL);
 115
 116   G_OBJECT_CLASS (g_output_stream_parent_class)->dispose (object);
 117 }
 118
 119 static void
 120 g_output_stream_class_init (GOutputStreamClass *klass)
 121 {
 122   GObjectClass *gobject_class = G_OBJECT_CLASS (klass);
 123
 124   g_type_class_add_private (klass, sizeof (GOutputStreamPrivate));
 125
 126   gobject_class->finalize = g_output_stream_finalize;
 127   gobject_class->dispose = g_output_stream_dispose;
 128
 129   klass->splice = g_output_stream_real_splice;
 130
 131   klass->write_async = g_output_stream_real_write_async;
 132   klass->write_finish = g_output_stream_real_write_finish;
 133   klass->splice_async = g_output_stream_real_splice_async;
 134   klass->splice_finish = g_output_stream_real_splice_finish;
 135   klass->flush_async = g_output_stream_real_flush_async;
 136   klass->flush_finish = g_output_stream_real_flush_finish;
 137   klass->close_async = g_output_stream_real_close_async;
 138   klass->close_finish = g_output_stream_real_close_finish;
 139 }
 140
 141 static void
 142 g_output_stream_init (GOutputStream *stream)
 143 {
 144   stream->priv = G_TYPE_INSTANCE_GET_PRIVATE (stream,
 145                                               G_TYPE_OUTPUT_STREAM,
 146                                               GOutputStreamPrivate);
 147 }
 148
 149 /**
 150  * g_output_stream_write:
 151  * @stream: a #GOutputStream.
 152  * @buffer: the buffer containing the data to write.
 153  * @count: the number of bytes to write
 154  * @cancellable: optional cancellable object
 155  * @error: location to store the error occuring, or %NULL to ignore
 156  *
 157  * Tries to write @count bytes from @buffer into the stream. Will block
 158  * during the operation.
 159  *
 160  * If count is zero returns zero and does nothing. A value of @count
 161  * larger than %G_MAXSSIZE will cause a %G_IO_ERROR_INVALID_ARGUMENT error.
 162  *
 163  * On success, the number of bytes written to the stream is returned.
 164  * It is not an error if this is not the same as the requested size, as it
 165  * can happen e.g. on a partial i/o error, or if there is not enough
 166  * storage in the stream. All writes either block until at least one byte
 167  * is written, so zero is never returned (unless @count is zero).
 168  *
 169  * If @cancellable is not NULL, then the operation can be cancelled by
 170  * triggering the cancellable object from another thread. If the operation
 171  * was cancelled, the error G_IO_ERROR_CANCELLED will be returned. If an
 172  * operation was partially finished when the operation was cancelled the
 173  * partial result will be returned, without an error.
 174  *
 175  * On error -1 is returned and @error is set accordingly.
 176  *
 177  * Return value: Number of bytes written, or -1 on error
 178  **/
 179 gssize
 180 g_output_stream_write (GOutputStream  *stream,
 181                        const void     *buffer,
 182                        gsize           count,
 183                        GCancellable   *cancellable,
 184                        GError        **error)
 185 {
 186   GOutputStreamClass *class;
 187   gssize res;
 188
 189   g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), -1);
 190   g_return_val_if_fail (buffer != NULL, 0);
 191
 192   if (count == 0)
 193     return 0;
 194
 195   if (((gssize) count) < 0)
 196     {
 197       g_set_error (error, G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 198                    _("Too large count value passed to %s"), G_STRFUNC);
 199       return -1;
 200     }
 201
 202   class = G_OUTPUT_STREAM_GET_CLASS (stream);
 203
 204   if (class->write_fn == NULL)
 205     {
 206       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 207                            _("Output stream doesn't implement write"));
 208       return -1;
 209     }
 210
 211   if (!g_output_stream_set_pending (stream, error))
 212     return -1;
 213
 214   if (cancellable)
 215     g_cancellable_push_current (cancellable);
 216
 217   res = class->write_fn (stream, buffer, count, cancellable, error);
 218
 219   if (cancellable)
 220     g_cancellable_pop_current (cancellable);
 221
 222   g_output_stream_clear_pending (stream);
 223
 224   return res;
 225 }
 226
 227 /**
 228  * g_output_stream_write_all:
 229  * @stream: a #GOutputStream.
 230  * @buffer: the buffer containing the data to write.
 231  * @count: the number of bytes to write
 232  * @bytes_written: location to store the number of bytes that was
 233  *     written to the stream
 234  * @cancellable: optional #GCancellable object, %NULL to ignore.
 235  * @error: location to store the error occuring, or %NULL to ignore
 236  *
 237  * Tries to write @count bytes from @buffer into the stream. Will block
 238  * during the operation.
 239  *
 240  * This function is similar to g_output_stream_write(), except it tries to
 241  * write as many bytes as requested, only stopping on an error.
 242  *
 243  * On a successful write of @count bytes, %TRUE is returned, and @bytes_written
 244  * is set to @count.
 245  *
 246  * If there is an error during the operation FALSE is returned and @error
 247  * is set to indicate the error status, @bytes_written is updated to contain
 248  * the number of bytes written into the stream before the error occurred.
 249  *
 250  * Return value: %TRUE on success, %FALSE if there was an error
 251  **/
 252 gboolean
 253 g_output_stream_write_all (GOutputStream  *stream,
 254                            const void     *buffer,
 255                            gsize           count,
 256                            gsize          *bytes_written,
 257                            GCancellable   *cancellable,
 258                            GError        **error)
 259 {
 260   gsize _bytes_written;
 261   gssize res;
 262
 263   g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), FALSE);
 264   g_return_val_if_fail (buffer != NULL, FALSE);
 265
 266   _bytes_written = 0;
 267   while (_bytes_written < count)
 268     {
 269       res = g_output_stream_write (stream, (char *)buffer + _bytes_written, count - _bytes_written,
 270                                    cancellable, error);
 271       if (res == -1)
 272         {
 273           if (bytes_written)
 274             *bytes_written = _bytes_written;
 275           return FALSE;
 276         }
 277
 278       if (res == 0)
 279         g_warning ("Write returned zero without error");
 280
 281       _bytes_written += res;
 282     }
 283
 284   if (bytes_written)
 285     *bytes_written = _bytes_written;
 286
 287   return TRUE;
 288 }
 289
 290 /**
 291  * g_output_stream_flush:
 292  * @stream: a #GOutputStream.
 293  * @cancellable: optional cancellable object
 294  * @error: location to store the error occuring, or %NULL to ignore
 295  *
 296  * Flushed any outstanding buffers in the stream. Will block during
 297  * the operation. Closing the stream will implicitly cause a flush.
 298  *
 299  * This function is optional for inherited classes.
 300  *
 301  * If @cancellable is not %NULL, then the operation can be cancelled by
 302  * triggering the cancellable object from another thread. If the operation
 303  * was cancelled, the error %G_IO_ERROR_CANCELLED will be returned.
 304  *
 305  * Return value: %TRUE on success, %FALSE on error
 306  **/
 307 gboolean
 308 g_output_stream_flush (GOutputStream  *stream,
 309                        GCancellable   *cancellable,
 310                        GError        **error)
 311 {
 312   GOutputStreamClass *class;
 313   gboolean res;
 314
 315   g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), FALSE);
 316
 317   if (!g_output_stream_set_pending (stream, error))
 318     return FALSE;
 319
 320   class = G_OUTPUT_STREAM_GET_CLASS (stream);
 321
 322   res = TRUE;
 323   if (class->flush)
 324     {
 325       if (cancellable)
 326         g_cancellable_push_current (cancellable);
 327
 328       res = class->flush (stream, cancellable, error);
 329
 330       if (cancellable)
 331         g_cancellable_pop_current (cancellable);
 332     }
 333
 334   g_output_stream_clear_pending (stream);
 335
 336   return res;
 337 }
 338
 339 /**
 340  * g_output_stream_splice:
 341  * @stream: a #GOutputStream.
 342  * @source: a #GInputStream.
 343  * @flags: a set of #GOutputStreamSpliceFlags.
 344  * @cancellable: optional #GCancellable object, %NULL to ignore.
 345  * @error: a #GError location to store the error occuring, or %NULL to
 346  * ignore.
 347  *
 348  * Splices an input stream into an output stream.
 349  *
 350  * Returns: a #gssize containing the size of the data spliced, or
 351  *     -1 if an error occurred.
 352  **/
 353 gssize
 354 g_output_stream_splice (GOutputStream             *stream,
 355                         GInputStream              *source,
 356                         GOutputStreamSpliceFlags   flags,
 357                         GCancellable              *cancellable,
 358                         GError                   **error)
 359 {
 360   GOutputStreamClass *class;
 361   gssize bytes_copied;
 362
 363   g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), -1);
 364   g_return_val_if_fail (G_IS_INPUT_STREAM (source), -1);
 365
 366   if (g_input_stream_is_closed (source))
 367     {
 368       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_CLOSED,
 369                            _("Source stream is already closed"));
 370       return -1;
 371     }
 372
 373   if (!g_output_stream_set_pending (stream, error))
 374     return -1;
 375
 376   class = G_OUTPUT_STREAM_GET_CLASS (stream);
 377
 378   if (cancellable)
 379     g_cancellable_push_current (cancellable);
 380
 381   bytes_copied = class->splice (stream, source, flags, cancellable, error);
 382
 383   if (cancellable)
 384     g_cancellable_pop_current (cancellable);
 385
 386   g_output_stream_clear_pending (stream);
 387
 388   return bytes_copied;
 389 }
 390
 391 static gssize
 392 g_output_stream_real_splice (GOutputStream             *stream,
 393                              GInputStream              *source,
 394                              GOutputStreamSpliceFlags   flags,
 395                              GCancellable              *cancellable,
 396                              GError                   **error)
 397 {
 398   GOutputStreamClass *class = G_OUTPUT_STREAM_GET_CLASS (stream);
 399   gssize n_read, n_written;
 400   gssize bytes_copied;
 401   char buffer[8192], *p;
 402   gboolean res;
 403
 404   bytes_copied = 0;
 405   if (class->write_fn == NULL)
 406     {
 407       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
 408                            _("Output stream doesn't implement write"));
 409       res = FALSE;
 410       goto notsupported;
 411     }
 412
 413   res = TRUE;
 414   do
 415     {
 416       n_read = g_input_stream_read (source, buffer, sizeof (buffer), cancellable, error);
 417       if (n_read == -1)
 418         {
 419           res = FALSE;
 420           break;
 421         }
 422
 423       if (n_read == 0)
 424         break;
 425
 426       p = buffer;
 427       while (n_read > 0)
 428         {
 429           n_written = class->write_fn (stream, p, n_read, cancellable, error);
 430           if (n_written == -1)
 431             {
 432               res = FALSE;
 433               break;
 434             }
 435
 436           p += n_written;
 437           n_read -= n_written;
 438           bytes_copied += n_written;
 439         }
 440     }
 441   while (res);
 442
 443  notsupported:
 444   if (!res)
 445     error = NULL; /* Ignore further errors */
 446
 447   if (flags & G_OUTPUT_STREAM_SPLICE_CLOSE_SOURCE)
 448     {
 449       /* Don't care about errors in source here */
 450       g_input_stream_close (source, cancellable, NULL);
 451     }
 452
 453   if (flags & G_OUTPUT_STREAM_SPLICE_CLOSE_TARGET)
 454     {
 455       /* But write errors on close are bad! */
 456       if (class->close_fn &&
 457           !class->close_fn (stream, cancellable, error))
 458         res = FALSE;
 459     }
 460
 461   if (res)
 462     return bytes_copied;
 463
 464   return -1;
 465 }
 466
 467
 468 /**
 469  * g_output_stream_close:
 470  * @stream: A #GOutputStream.
 471  * @cancellable: optional cancellable object
 472  * @error: location to store the error occuring, or %NULL to ignore
 473  *
 474  * Closes the stream, releasing resources related to it.
 475  *
 476  * Once the stream is closed, all other operations will return %G_IO_ERROR_CLOSED.
 477  * Closing a stream multiple times will not return an error.
 478  *
 479  * Closing a stream will automatically flush any outstanding buffers in the
 480  * stream.
 481  *
 482  * Streams will be automatically closed when the last reference
 483  * is dropped, but you might want to call this function to make sure
 484  * resources are released as early as possible.
 485  *
 486  * Some streams might keep the backing store of the stream (e.g. a file descriptor)
 487  * open after the stream is closed. See the documentation for the individual
 488  * stream for details.
 489  *
 490  * On failure the first error that happened will be reported, but the close
 491  * operation will finish as much as possible. A stream that failed to
 492  * close will still return %G_IO_ERROR_CLOSED for all operations. Still, it
 493  * is important to check and report the error to the user, otherwise
 494  * there might be a loss of data as all data might not be written.
 495  *
 496  * If @cancellable is not NULL, then the operation can be cancelled by
 497  * triggering the cancellable object from another thread. If the operation
 498  * was cancelled, the error %G_IO_ERROR_CANCELLED will be returned.
 499  * Cancelling a close will still leave the stream closed, but there some streams
 500  * can use a faster close that doesn't block to e.g. check errors. On
 501  * cancellation (as with any error) there is no guarantee that all written
 502  * data will reach the target.
 503  *
 504  * Return value: %TRUE on success, %FALSE on failure
 505  **/
 506 gboolean
 507 g_output_stream_close (GOutputStream  *stream,
 508                        GCancellable   *cancellable,
 509                        GError        **error)
 510 {
 511   GOutputStreamClass *class;
 512   gboolean res;
 513
 514   g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), FALSE);
 515
 516   class = G_OUTPUT_STREAM_GET_CLASS (stream);
 517
 518   if (stream->priv->closed)
 519     return TRUE;
 520
 521   if (!g_output_stream_set_pending (stream, error))
 522     return FALSE;
 523
 524   stream->priv->closing = TRUE;
 525
 526   if (cancellable)
 527     g_cancellable_push_current (cancellable);
 528
 529   if (class->flush)
 530     res = class->flush (stream, cancellable, error);
 531   else
 532     res = TRUE;
 533
 534   if (!res)
 535     {
 536       /* flushing caused the error that we want to return,
 537        * but we still want to close the underlying stream if possible
 538        */
 539       if (class->close_fn)
 540         class->close_fn (stream, cancellable, NULL);
 541     }
 542   else
 543     {
 544       res = TRUE;
 545       if (class->close_fn)
 546         res = class->close_fn (stream, cancellable, error);
 547     }
 548
 549   if (cancellable)
 550     g_cancellable_pop_current (cancellable);
 551
 552   stream->priv->closing = FALSE;
 553   stream->priv->closed = TRUE;
 554   g_output_stream_clear_pending (stream);
 555
 556   return res;
 557 }
 558
 559 static void
 560 async_ready_callback_wrapper (GObject      *source_object,
 561                               GAsyncResult *res,
 562                               gpointer      user_data)
 563 {
 564   GOutputStream *stream = G_OUTPUT_STREAM (source_object);
 565
 566   g_output_stream_clear_pending (stream);
 567   if (stream->priv->outstanding_callback)
 568     (*stream->priv->outstanding_callback) (source_object, res, user_data);
 569   g_object_unref (stream);
 570 }
 571
 572 typedef struct {
 573   gint io_priority;
 574   GCancellable *cancellable;
 575   GError *flush_error;
 576   gpointer user_data;
 577 } CloseUserData;
 578
 579 static void
 580 async_ready_close_callback_wrapper (GObject      *source_object,
 581                                     GAsyncResult *res,
 582                                     gpointer      user_data)
 583 {
 584   GOutputStream *stream = G_OUTPUT_STREAM (source_object);
 585   CloseUserData *data = user_data;
 586
 587   stream->priv->closing = FALSE;
 588   stream->priv->closed = TRUE;
 589
 590   g_output_stream_clear_pending (stream);
 591
 592   if (stream->priv->outstanding_callback)
 593     {
 594       if (data->flush_error != NULL)
 595         {
 596           GSimpleAsyncResult *err;
 597
 598           err = g_simple_async_result_new_from_error (source_object,
 599                                                       stream->priv->outstanding_callback,
 600                                                       data->user_data,
 601                                                       data->flush_error);
 602
 603           (*stream->priv->outstanding_callback) (source_object,
 604                                                  G_ASYNC_RESULT (err),
 605                                                  data->user_data);
 606           g_object_unref (err);
 607         }
 608       else
 609         {
 610           (*stream->priv->outstanding_callback) (source_object,
 611                                                  res,
 612                                                  data->user_data);
 613         }
 614     }
 615
 616   g_object_unref (stream);
 617
 618   if (data->cancellable)
 619     g_object_unref (data->cancellable);
 620
 621   if (data->flush_error)
 622     g_error_free (data->flush_error);
 623
 624   g_slice_free (CloseUserData, data);
 625 }
 626
 627 static void
 628 async_ready_close_flushed_callback_wrapper (GObject      *source_object,
 629                                             GAsyncResult *res,
 630                                             gpointer      user_data)
 631 {
 632   GOutputStream *stream = G_OUTPUT_STREAM (source_object);
 633   GOutputStreamClass *class;
 634   CloseUserData *data = user_data;
 635   GSimpleAsyncResult *simple;
 636
 637   /* propagate the possible error */
 638   if (G_IS_SIMPLE_ASYNC_RESULT (res))
 639     {
 640       simple = G_SIMPLE_ASYNC_RESULT (res);
 641       g_simple_async_result_propagate_error (simple, &data->flush_error);
 642     }
 643
 644   class = G_OUTPUT_STREAM_GET_CLASS (stream);
 645
 646   /* we still close, even if there was a flush error */
 647   class->close_async (stream, data->io_priority, data->cancellable,
 648                       async_ready_close_callback_wrapper, user_data);
 649 }
 650
 651 /**
 652  * g_output_stream_write_async:
 653  * @stream: A #GOutputStream.
 654  * @buffer: the buffer containing the data to write.
 655  * @count: the number of bytes to write
 656  * @io_priority: the io priority of the request.
 657  * @cancellable: optional #GCancellable object, %NULL to ignore.
 658  * @callback: callback to call when the request is satisfied
 659  * @user_data: the data to pass to callback function
 660  *
 661  * Request an asynchronous write of @count bytes from @buffer into
 662  * the stream. When the operation is finished @callback will be called.
 663  * You can then call g_output_stream_write_finish() to get the result of the
 664  * operation.
 665  *
 666  * During an async request no other sync and async calls are allowed,
 667  * and will result in %G_IO_ERROR_PENDING errors.
 668  *
 669  * A value of @count larger than %G_MAXSSIZE will cause a
 670  * %G_IO_ERROR_INVALID_ARGUMENT error.
 671  *
 672  * On success, the number of bytes written will be passed to the
 673  * @callback. It is not an error if this is not the same as the
 674  * requested size, as it can happen e.g. on a partial I/O error,
 675  * but generally we try to write as many bytes as requested.
 676  *
 677  * Any outstanding I/O request with higher priority (lower numerical
 678  * value) will be executed before an outstanding request with lower
 679  * priority. Default priority is %G_PRIORITY_DEFAULT.
 680  *
 681  * The asyncronous methods have a default fallback that uses threads
 682  * to implement asynchronicity, so they are optional for inheriting
 683  * classes. However, if you override one you must override all.
 684  *
 685  * For the synchronous, blocking version of this function, see
 686  * g_output_stream_write().
 687  **/
 688 void
 689 g_output_stream_write_async (GOutputStream       *stream,
 690                              const void          *buffer,
 691                              gsize                count,
 692                              int                  io_priority,
 693                              GCancellable        *cancellable,
 694                              GAsyncReadyCallback  callback,
 695                              gpointer             user_data)
 696 {
 697   GOutputStreamClass *class;
 698   GSimpleAsyncResult *simple;
 699   GError *error = NULL;
 700
 701   g_return_if_fail (G_IS_OUTPUT_STREAM (stream));
 702   g_return_if_fail (buffer != NULL);
 703
 704   if (count == 0)
 705     {
 706       simple = g_simple_async_result_new (G_OBJECT (stream),
 707                                           callback,
 708                                           user_data,
 709                                           g_output_stream_write_async);
 710       g_simple_async_result_complete_in_idle (simple);
 711       g_object_unref (simple);
 712       return;
 713     }
 714
 715   if (((gssize) count) < 0)
 716     {
 717       g_simple_async_report_error_in_idle (G_OBJECT (stream),
 718                                            callback,
 719                                            user_data,
 720                                            G_IO_ERROR, G_IO_ERROR_INVALID_ARGUMENT,
 721                                            _("Too large count value passed to %s"),
 722                                            G_STRFUNC);
 723       return;
 724     }
 725
 726   if (!g_output_stream_set_pending (stream, &error))
 727     {
 728       g_simple_async_report_gerror_in_idle (G_OBJECT (stream),
 729                                             callback,
 730                                             user_data,
 731                                             error);
 732       g_error_free (error);
 733       return;
 734     }
 735
 736   class = G_OUTPUT_STREAM_GET_CLASS (stream);
 737
 738   stream->priv->outstanding_callback = callback;
 739   g_object_ref (stream);
 740   class->write_async (stream, buffer, count, io_priority, cancellable,
 741                       async_ready_callback_wrapper, user_data);
 742 }
 743
 744 /**
 745  * g_output_stream_write_finish:
 746  * @stream: a #GOutputStream.
 747  * @result: a #GAsyncResult.
 748  * @error: a #GError location to store the error occuring, or %NULL to
 749  * ignore.
 750  *
 751  * Finishes a stream write operation.
 752  *
 753  * Returns: a #gssize containing the number of bytes written to the stream.
 754  **/
 755 gssize
 756 g_output_stream_write_finish (GOutputStream  *stream,
 757                               GAsyncResult   *result,
 758                               GError        **error)
 759 {
 760   GSimpleAsyncResult *simple;
 761   GOutputStreamClass *class;
 762
 763   g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), -1);
 764   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), -1);
 765
 766   if (G_IS_SIMPLE_ASYNC_RESULT (result))
 767     {
 768       simple = G_SIMPLE_ASYNC_RESULT (result);
 769       if (g_simple_async_result_propagate_error (simple, error))
 770         return -1;
 771
 772       /* Special case writes of 0 bytes */
 773       if (g_simple_async_result_get_source_tag (simple) == g_output_stream_write_async)
 774         return 0;
 775     }
 776
 777   class = G_OUTPUT_STREAM_GET_CLASS (stream);
 778   return class->write_finish (stream, result, error);
 779 }
 780
 781 typedef struct {
 782   GInputStream *source;
 783   gpointer user_data;
 784   GAsyncReadyCallback callback;
 785 } SpliceUserData;
 786
 787 static void
 788 async_ready_splice_callback_wrapper (GObject      *source_object,
 789                                      GAsyncResult *res,
 790                                      gpointer     _data)
 791 {
 792   GOutputStream *stream = G_OUTPUT_STREAM (source_object);
 793   SpliceUserData *data = _data;
 794
 795   g_output_stream_clear_pending (stream);
 796
 797   if (data->callback)
 798     (*data->callback) (source_object, res, data->user_data);
 799
 800   g_object_unref (stream);
 801   g_object_unref (data->source);
 802   g_free (data);
 803 }
 804
 805 /**
 806  * g_output_stream_splice_async:
 807  * @stream: a #GOutputStream.
 808  * @source: a #GInputStream.
 809  * @flags: a set of #GOutputStreamSpliceFlags.
 810  * @io_priority: the io priority of the request.
 811  * @cancellable: optional #GCancellable object, %NULL to ignore.
 812  * @callback: a #GAsyncReadyCallback.
 813  * @user_data: user data passed to @callback.
 814  *
 815  * Splices a stream asynchronously.
 816  * When the operation is finished @callback will be called.
 817  * You can then call g_output_stream_splice_finish() to get the
 818  * result of the operation.
 819  *
 820  * For the synchronous, blocking version of this function, see
 821  * g_output_stream_splice().
 822  **/
 823 void
 824 g_output_stream_splice_async (GOutputStream            *stream,
 825                               GInputStream             *source,
 826                               GOutputStreamSpliceFlags  flags,
 827                               int                       io_priority,
 828                               GCancellable             *cancellable,
 829                               GAsyncReadyCallback       callback,
 830                               gpointer                  user_data)
 831 {
 832   GOutputStreamClass *class;
 833   SpliceUserData *data;
 834   GError *error = NULL;
 835
 836   g_return_if_fail (G_IS_OUTPUT_STREAM (stream));
 837   g_return_if_fail (G_IS_INPUT_STREAM (source));
 838
 839   if (g_input_stream_is_closed (source))
 840     {
 841       g_simple_async_report_error_in_idle (G_OBJECT (stream),
 842                                            callback,
 843                                            user_data,
 844                                            G_IO_ERROR, G_IO_ERROR_CLOSED,
 845                                            _("Source stream is already closed"));
 846       return;
 847     }
 848
 849   if (!g_output_stream_set_pending (stream, &error))
 850     {
 851       g_simple_async_report_gerror_in_idle (G_OBJECT (stream),
 852                                             callback,
 853                                             user_data,
 854                                             error);
 855       g_error_free (error);
 856       return;
 857     }
 858
 859   class = G_OUTPUT_STREAM_GET_CLASS (stream);
 860
 861   data = g_new0 (SpliceUserData, 1);
 862   data->callback = callback;
 863   data->user_data = user_data;
 864   data->source = g_object_ref (source);
 865
 866   g_object_ref (stream);
 867   class->splice_async (stream, source, flags, io_priority, cancellable,
 868                       async_ready_splice_callback_wrapper, data);
 869 }
 870
 871 /**
 872  * g_output_stream_splice_finish:
 873  * @stream: a #GOutputStream.
 874  * @result: a #GAsyncResult.
 875  * @error: a #GError location to store the error occuring, or %NULL to
 876  * ignore.
 877  *
 878  * Finishes an asynchronous stream splice operation.
 879  *
 880  * Returns: a #gssize of the number of bytes spliced.
 881  **/
 882 gssize
 883 g_output_stream_splice_finish (GOutputStream  *stream,
 884                                GAsyncResult   *result,
 885                                GError        **error)
 886 {
 887   GSimpleAsyncResult *simple;
 888   GOutputStreamClass *class;
 889
 890   g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), -1);
 891   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), -1);
 892
 893   if (G_IS_SIMPLE_ASYNC_RESULT (result))
 894     {
 895       simple = G_SIMPLE_ASYNC_RESULT (result);
 896       if (g_simple_async_result_propagate_error (simple, error))
 897         return -1;
 898     }
 899
 900   class = G_OUTPUT_STREAM_GET_CLASS (stream);
 901   return class->splice_finish (stream, result, error);
 902 }
 903
 904 /**
 905  * g_output_stream_flush_async:
 906  * @stream: a #GOutputStream.
 907  * @io_priority: the io priority of the request.
 908  * @cancellable: optional #GCancellable object, %NULL to ignore.
 909  * @callback: a #GAsyncReadyCallback to call when the request is satisfied
 910  * @user_data: the data to pass to callback function
 911  *
 912  * Flushes a stream asynchronously.
 913  * For behaviour details see g_output_stream_flush().
 914  *
 915  * When the operation is finished @callback will be
 916  * called. You can then call g_output_stream_flush_finish() to get the
 917  * result of the operation.
 918  **/
 919 void
 920 g_output_stream_flush_async (GOutputStream       *stream,
 921                              int                  io_priority,
 922                              GCancellable        *cancellable,
 923                              GAsyncReadyCallback  callback,
 924                              gpointer             user_data)
 925 {
 926   GOutputStreamClass *class;
 927   GSimpleAsyncResult *simple;
 928   GError *error = NULL;
 929
 930   g_return_if_fail (G_IS_OUTPUT_STREAM (stream));
 931
 932   if (!g_output_stream_set_pending (stream, &error))
 933     {
 934       g_simple_async_report_gerror_in_idle (G_OBJECT (stream),
 935                                             callback,
 936                                             user_data,
 937                                             error);
 938       g_error_free (error);
 939       return;
 940     }
 941
 942   stream->priv->outstanding_callback = callback;
 943   g_object_ref (stream);
 944
 945   class = G_OUTPUT_STREAM_GET_CLASS (stream);
 946
 947   if (class->flush_async == NULL)
 948     {
 949       simple = g_simple_async_result_new (G_OBJECT (stream),
 950                                           async_ready_callback_wrapper,
 951                                           user_data,
 952                                           g_output_stream_flush_async);
 953       g_simple_async_result_complete_in_idle (simple);
 954       g_object_unref (simple);
 955       return;
 956     }
 957
 958   class->flush_async (stream, io_priority, cancellable,
 959                       async_ready_callback_wrapper, user_data);
 960 }
 961
 962 /**
 963  * g_output_stream_flush_finish:
 964  * @stream: a #GOutputStream.
 965  * @result: a GAsyncResult.
 966  * @error: a #GError location to store the error occuring, or %NULL to
 967  * ignore.
 968  *
 969  * Finishes flushing an output stream.
 970  *
 971  * Returns: %TRUE if flush operation suceeded, %FALSE otherwise.
 972  **/
 973 gboolean
 974 g_output_stream_flush_finish (GOutputStream  *stream,
 975                               GAsyncResult   *result,
 976                               GError        **error)
 977 {
 978   GSimpleAsyncResult *simple;
 979   GOutputStreamClass *klass;
 980
 981   g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), FALSE);
 982   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
 983
 984   if (G_IS_SIMPLE_ASYNC_RESULT (result))
 985     {
 986       simple = G_SIMPLE_ASYNC_RESULT (result);
 987       if (g_simple_async_result_propagate_error (simple, error))
 988         return FALSE;
 989
 990       /* Special case default implementation */
 991       if (g_simple_async_result_get_source_tag (simple) == g_output_stream_flush_async)
 992         return TRUE;
 993     }
 994
 995   klass = G_OUTPUT_STREAM_GET_CLASS (stream);
 996   return klass->flush_finish (stream, result, error);
 997 }
 998
 999
1000 /**
1001  * g_output_stream_close_async:
1002  * @stream: A #GOutputStream.
1003  * @io_priority: the io priority of the request.
1004  * @callback: callback to call when the request is satisfied
1005  * @user_data: the data to pass to callback function
1006  * @cancellable: optional cancellable object
1007  *
1008  * Requests an asynchronous close of the stream, releasing resources
1009  * related to it. When the operation is finished @callback will be
1010  * called. You can then call g_output_stream_close_finish() to get
1011  * the result of the operation.
1012  *
1013  * For behaviour details see g_output_stream_close().
1014  *
1015  * The asyncronous methods have a default fallback that uses threads
1016  * to implement asynchronicity, so they are optional for inheriting
1017  * classes. However, if you override one you must override all.
1018  **/
1019 void
1020 g_output_stream_close_async (GOutputStream       *stream,
1021                              int                  io_priority,
1022                              GCancellable        *cancellable,
1023                              GAsyncReadyCallback  callback,
1024                              gpointer             user_data)
1025 {
1026   GOutputStreamClass *class;
1027   GSimpleAsyncResult *simple;
1028   GError *error = NULL;
1029   CloseUserData *data;
1030
1031   g_return_if_fail (G_IS_OUTPUT_STREAM (stream));
1032
1033   if (stream->priv->closed)
1034     {
1035       simple = g_simple_async_result_new (G_OBJECT (stream),
1036                                           callback,
1037                                           user_data,
1038                                           g_output_stream_close_async);
1039       g_simple_async_result_complete_in_idle (simple);
1040       g_object_unref (simple);
1041       return;
1042     }
1043
1044   if (!g_output_stream_set_pending (stream, &error))
1045     {
1046       g_simple_async_report_gerror_in_idle (G_OBJECT (stream),
1047                                             callback,
1048                                             user_data,
1049                                             error);
1050       g_error_free (error);
1051       return;
1052     }
1053
1054   class = G_OUTPUT_STREAM_GET_CLASS (stream);
1055   stream->priv->closing = TRUE;
1056   stream->priv->outstanding_callback = callback;
1057   g_object_ref (stream);
1058
1059   data = g_slice_new0 (CloseUserData);
1060
1061   if (cancellable != NULL)
1062     data->cancellable = g_object_ref (cancellable);
1063
1064   data->io_priority = io_priority;
1065   data->user_data = user_data;
1066
1067   /* Call close_async directly if there is no need to flush, or if the flush
1068      can be done sync (in the output stream async close thread) */
1069   if (class->flush_async == NULL ||
1070       (class->flush_async == g_output_stream_real_flush_async &&
1071        (class->flush == NULL || class->close_async == g_output_stream_real_close_async)))
1072     {
1073       class->close_async (stream, io_priority, cancellable,
1074                           async_ready_close_callback_wrapper, data);
1075     }
1076   else
1077     {
1078       /* First do an async flush, then do the async close in the callback
1079          wrapper (see async_ready_close_flushed_callback_wrapper) */
1080       class->flush_async (stream, io_priority, cancellable,
1081                           async_ready_close_flushed_callback_wrapper, data);
1082     }
1083 }
1084
1085 /**
1086  * g_output_stream_close_finish:
1087  * @stream: a #GOutputStream.
1088  * @result: a #GAsyncResult.
1089  * @error: a #GError location to store the error occuring, or %NULL to
1090  * ignore.
1091  *
1092  * Closes an output stream.
1093  *
1094  * Returns: %TRUE if stream was successfully closed, %FALSE otherwise.
1095  **/
1096 gboolean
1097 g_output_stream_close_finish (GOutputStream  *stream,
1098                               GAsyncResult   *result,
1099                               GError        **error)
1100 {
1101   GSimpleAsyncResult *simple;
1102   GOutputStreamClass *class;
1103
1104   g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), FALSE);
1105   g_return_val_if_fail (G_IS_ASYNC_RESULT (result), FALSE);
1106
1107   if (G_IS_SIMPLE_ASYNC_RESULT (result))
1108     {
1109       simple = G_SIMPLE_ASYNC_RESULT (result);
1110       if (g_simple_async_result_propagate_error (simple, error))
1111         return FALSE;
1112
1113       /* Special case already closed */
1114       if (g_simple_async_result_get_source_tag (simple) == g_output_stream_close_async)
1115         return TRUE;
1116     }
1117
1118   class = G_OUTPUT_STREAM_GET_CLASS (stream);
1119   return class->close_finish (stream, result, error);
1120 }
1121
1122 /**
1123  * g_output_stream_is_closed:
1124  * @stream: a #GOutputStream.
1125  *
1126  * Checks if an output stream has already been closed.
1127  *
1128  * Returns: %TRUE if @stream is closed. %FALSE otherwise.
1129  **/
1130 gboolean
1131 g_output_stream_is_closed (GOutputStream *stream)
1132 {
1133   g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), TRUE);
1134
1135   return stream->priv->closed;
1136 }
1137
1138 /**
1139  * g_output_stream_is_closing:
1140  * @stream: a #GOutputStream.
1141  *
1142  * Checks if an output stream is being closed. This can be
1143  * used inside e.g. a flush implementation to see if the
1144  * flush (or other i/o operation) is called from within
1145  * the closing operation.
1146  *
1147  * Returns: %TRUE if @stream is being closed. %FALSE otherwise.
1148  *
1149  * Since: 2.24
1150  **/
1151 gboolean
1152 g_output_stream_is_closing (GOutputStream *stream)
1153 {
1154   g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), TRUE);
1155
1156   return stream->priv->closing;
1157 }
1158
1159 /**
1160  * g_output_stream_has_pending:
1161  * @stream: a #GOutputStream.
1162  *
1163  * Checks if an ouput stream has pending actions.
1164  *
1165  * Returns: %TRUE if @stream has pending actions.
1166  **/
1167 gboolean
1168 g_output_stream_has_pending (GOutputStream *stream)
1169 {
1170   g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), FALSE);
1171
1172   return stream->priv->pending;
1173 }
1174
1175 /**
1176  * g_output_stream_set_pending:
1177  * @stream: a #GOutputStream.
1178  * @error: a #GError location to store the error occuring, or %NULL to
1179  * ignore.
1180  *
1181  * Sets @stream to have actions pending. If the pending flag is
1182  * already set or @stream is closed, it will return %FALSE and set
1183  * @error.
1184  *
1185  * Return value: %TRUE if pending was previously unset and is now set.
1186  **/
1187 gboolean
1188 g_output_stream_set_pending (GOutputStream *stream,
1189                              GError **error)
1190 {
1191   g_return_val_if_fail (G_IS_OUTPUT_STREAM (stream), FALSE);
1192
1193   if (stream->priv->closed)
1194     {
1195       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_CLOSED,
1196                            _("Stream is already closed"));
1197       return FALSE;
1198     }
1199
1200   if (stream->priv->pending)
1201     {
1202       g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_PENDING,
1203                            /* Translators: This is an error you get if there is
1204                             * already an operation running against this stream when
1205                             * you try to start one */
1206                            _("Stream has outstanding operation"));
1207       return FALSE;
1208     }
1209
1210   stream->priv->pending = TRUE;
1211   return TRUE;
1212 }
1213
1214 /**
1215  * g_output_stream_clear_pending:
1216  * @stream: output stream
1217  *
1218  * Clears the pending flag on @stream.
1219  **/
1220 void
1221 g_output_stream_clear_pending (GOutputStream *stream)
1222 {
1223   g_return_if_fail (G_IS_OUTPUT_STREAM (stream));
1224
1225   stream->priv->pending = FALSE;
1226 }
1227
1228
1229 /********************************************
1230  *   Default implementation of async ops    *
1231  ********************************************/
1232
1233 typedef struct {
1234   const void         *buffer;
1235   gsize               count_requested;
1236   gssize              count_written;
1237 } WriteData;
1238
1239 static void
1240 write_async_thread (GSimpleAsyncResult *res,
1241                     GObject            *object,
1242                     GCancellable       *cancellable)
1243 {
1244   WriteData *op;
1245   GOutputStreamClass *class;
1246   GError *error = NULL;
1247
1248   class = G_OUTPUT_STREAM_GET_CLASS (object);
1249   op = g_simple_async_result_get_op_res_gpointer (res);
1250   op->count_written = class->write_fn (G_OUTPUT_STREAM (object), op->buffer, op->count_requested,
1251                                        cancellable, &error);
1252   if (op->count_written == -1)
1253     {
1254       g_simple_async_result_set_from_error (res, error);
1255       g_error_free (error);
1256     }
1257 }
1258
1259 static void
1260 g_output_stream_real_write_async (GOutputStream       *stream,
1261                                   const void          *buffer,
1262                                   gsize                count,
1263                                   int                  io_priority,
1264                                   GCancellable        *cancellable,
1265                                   GAsyncReadyCallback  callback,
1266                                   gpointer             user_data)
1267 {
1268   GSimpleAsyncResult *res;
1269   WriteData *op;
1270
1271   op = g_new0 (WriteData, 1);
1272   res = g_simple_async_result_new (G_OBJECT (stream), callback, user_data, g_output_stream_real_write_async);
1273   g_simple_async_result_set_op_res_gpointer (res, op, g_free);
1274   op->buffer = buffer;
1275   op->count_requested = count;
1276
1277   g_simple_async_result_run_in_thread (res, write_async_thread, io_priority, cancellable);
1278   g_object_unref (res);
1279 }
1280
1281 static gssize
1282 g_output_stream_real_write_finish (GOutputStream  *stream,
1283                                    GAsyncResult   *result,
1284                                    GError        **error)
1285 {
1286   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
1287   WriteData *op;
1288
1289   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_output_stream_real_write_async);
1290   op = g_simple_async_result_get_op_res_gpointer (simple);
1291   return op->count_written;
1292 }
1293
1294 typedef struct {
1295   GInputStream *source;
1296   GOutputStreamSpliceFlags flags;
1297   gssize bytes_copied;
1298 } SpliceData;
1299
1300 static void
1301 splice_async_thread (GSimpleAsyncResult *result,
1302                      GObject            *object,
1303                      GCancellable       *cancellable)
1304 {
1305   SpliceData *op;
1306   GOutputStreamClass *class;
1307   GError *error = NULL;
1308   GOutputStream *stream;
1309
1310   stream = G_OUTPUT_STREAM (object);
1311   class = G_OUTPUT_STREAM_GET_CLASS (object);
1312   op = g_simple_async_result_get_op_res_gpointer (result);
1313
1314   op->bytes_copied = class->splice (stream,
1315                                     op->source,
1316                                     op->flags,
1317                                     cancellable,
1318                                     &error);
1319   if (op->bytes_copied == -1)
1320     {
1321       g_simple_async_result_set_from_error (result, error);
1322       g_error_free (error);
1323     }
1324 }
1325
1326 static void
1327 g_output_stream_real_splice_async (GOutputStream             *stream,
1328                                    GInputStream              *source,
1329                                    GOutputStreamSpliceFlags   flags,
1330                                    int                        io_priority,
1331                                    GCancellable              *cancellable,
1332                                    GAsyncReadyCallback        callback,
1333                                    gpointer                   user_data)
1334 {
1335   GSimpleAsyncResult *res;
1336   SpliceData *op;
1337
1338   op = g_new0 (SpliceData, 1);
1339   res = g_simple_async_result_new (G_OBJECT (stream), callback, user_data, g_output_stream_real_splice_async);
1340   g_simple_async_result_set_op_res_gpointer (res, op, g_free);
1341   op->flags = flags;
1342   op->source = source;
1343
1344   /* TODO: In the case where both source and destintion have
1345      non-threadbased async calls we can use a true async copy here */
1346
1347   g_simple_async_result_run_in_thread (res, splice_async_thread, io_priority, cancellable);
1348   g_object_unref (res);
1349 }
1350
1351 static gssize
1352 g_output_stream_real_splice_finish (GOutputStream  *stream,
1353                                     GAsyncResult   *result,
1354                                     GError        **error)
1355 {
1356   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
1357   SpliceData *op;
1358
1359   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_output_stream_real_splice_async);
1360   op = g_simple_async_result_get_op_res_gpointer (simple);
1361   return op->bytes_copied;
1362 }
1363
1364
1365 static void
1366 flush_async_thread (GSimpleAsyncResult *res,
1367                     GObject            *object,
1368                     GCancellable       *cancellable)
1369 {
1370   GOutputStreamClass *class;
1371   gboolean result;
1372   GError *error = NULL;
1373
1374   class = G_OUTPUT_STREAM_GET_CLASS (object);
1375   result = TRUE;
1376   if (class->flush)
1377     result = class->flush (G_OUTPUT_STREAM (object), cancellable, &error);
1378
1379   if (!result)
1380     {
1381       g_simple_async_result_set_from_error (res, error);
1382       g_error_free (error);
1383     }
1384 }
1385
1386 static void
1387 g_output_stream_real_flush_async (GOutputStream       *stream,
1388                                   int                  io_priority,
1389                                   GCancellable        *cancellable,
1390                                   GAsyncReadyCallback  callback,
1391                                   gpointer             user_data)
1392 {
1393   GSimpleAsyncResult *res;
1394
1395   res = g_simple_async_result_new (G_OBJECT (stream), callback, user_data, g_output_stream_real_write_async);
1396
1397   g_simple_async_result_run_in_thread (res, flush_async_thread, io_priority, cancellable);
1398   g_object_unref (res);
1399 }
1400
1401 static gboolean
1402 g_output_stream_real_flush_finish (GOutputStream  *stream,
1403                                    GAsyncResult   *result,
1404                                    GError        **error)
1405 {
1406   return TRUE;
1407 }
1408
1409 static void
1410 close_async_thread (GSimpleAsyncResult *res,
1411                     GObject            *object,
1412                     GCancellable       *cancellable)
1413 {
1414   GOutputStreamClass *class;
1415   GError *error = NULL;
1416   gboolean result = TRUE;
1417
1418   class = G_OUTPUT_STREAM_GET_CLASS (object);
1419
1420   /* Do a flush here if there is a flush function, and we did not have to do
1421      an async flush before (see g_output_stream_close_async) */
1422   if (class->flush != NULL &&
1423       (class->flush_async == NULL ||
1424        class->flush_async == g_output_stream_real_flush_async))
1425     {
1426       result = class->flush (G_OUTPUT_STREAM (object), cancellable, &error);
1427     }
1428
1429   /* Auto handling of cancelation disabled, and ignore
1430      cancellation, since we want to close things anyway, although
1431      possibly in a quick-n-dirty way. At least we never want to leak
1432      open handles */
1433
1434   if (class->close_fn)
1435     {
1436       /* Make sure to close, even if the flush failed (see sync close) */
1437       if (!result)
1438         class->close_fn (G_OUTPUT_STREAM (object), cancellable, NULL);
1439       else
1440         result = class->close_fn (G_OUTPUT_STREAM (object), cancellable, &error);
1441
1442       if (!result)
1443         {
1444           g_simple_async_result_set_from_error (res, error);
1445           g_error_free (error);
1446         }
1447     }
1448 }
1449
1450 static void
1451 g_output_stream_real_close_async (GOutputStream       *stream,
1452                                   int                  io_priority,
1453                                   GCancellable        *cancellable,
1454                                   GAsyncReadyCallback  callback,
1455                                   gpointer             user_data)
1456 {
1457   GSimpleAsyncResult *res;
1458
1459   res = g_simple_async_result_new (G_OBJECT (stream), callback, user_data, g_output_stream_real_close_async);
1460
1461   g_simple_async_result_set_handle_cancellation (res, FALSE);
1462
1463   g_simple_async_result_run_in_thread (res, close_async_thread, io_priority, cancellable);
1464   g_object_unref (res);
1465 }
1466
1467 static gboolean
1468 g_output_stream_real_close_finish (GOutputStream  *stream,
1469                                    GAsyncResult   *result,
1470                                    GError        **error)
1471 {
1472   GSimpleAsyncResult *simple = G_SIMPLE_ASYNC_RESULT (result);
1473   g_warn_if_fail (g_simple_async_result_get_source_tag (simple) == g_output_stream_real_close_async);
1474   return TRUE;
1475 }
1476
1477 #define __G_OUTPUT_STREAM_C__
1478 #include "gioaliasdef.c"