mirror of
https://gitlab.gnome.org/GNOME/glib.git
synced 2025-10-31 08:22:16 +01:00
7feeafd9db
There are a lot of links to the description of I/O priority in the GIO docs, and they’re all currently broken since the docs build was ported to gi-docgen. Use a simple find and replace (see below) to fix them. This doesn’t port any of the surrounding docs to gi-docgen format, but should still improve things overall. ```sh git search-replace --fix '\[I/O priority\]\[io-priority\]///[I/O priority](iface.AsyncResult.html#io-priority)' ``` Signed-off-by: Philip Withnall <pwithnall@gnome.org> Helps: #3250
430 lines
14 KiB
C
430 lines
14 KiB
C
/* GIO - GLib Input, Output and Streaming Library
|
||
*
|
||
* Copyright (C) 2006-2007 Red Hat, Inc.
|
||
*
|
||
* SPDX-License-Identifier: LGPL-2.1-or-later
|
||
*
|
||
* This library is free software; you can redistribute it and/or
|
||
* modify it under the terms of the GNU Lesser General Public
|
||
* License as published by the Free Software Foundation; either
|
||
* version 2.1 of the License, or (at your option) any later version.
|
||
*
|
||
* This library is distributed in the hope that it will be useful,
|
||
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
* Lesser General Public License for more details.
|
||
*
|
||
* You should have received a copy of the GNU Lesser General
|
||
* Public License along with this library; if not, see <http://www.gnu.org/licenses/>.
|
||
*
|
||
* Author: Alexander Larsson <alexl@redhat.com>
|
||
*/
|
||
|
||
#include "config.h"
|
||
|
||
#include <glib.h>
|
||
#include <gfileinputstream.h>
|
||
#include <gseekable.h>
|
||
#include "gcancellable.h"
|
||
#include "gasyncresult.h"
|
||
#include "gtask.h"
|
||
#include "gioerror.h"
|
||
#include "glibintl.h"
|
||
|
||
|
||
/**
|
||
* GFileInputStream:
|
||
*
|
||
* `GFileInputStream` provides input streams that take their
|
||
* content from a file.
|
||
*
|
||
* `GFileInputStream` implements [iface@Gio.Seekable], which allows the input
|
||
* stream to jump to arbitrary positions in the file, provided the
|
||
* filesystem of the file allows it. To find the position of a file
|
||
* input stream, use [method@Gio.Seekable.tell]. To find out if a file input
|
||
* stream supports seeking, use [vfunc@Gio.Seekable.can_seek].
|
||
* To position a file input stream, use [vfunc@Gio.Seekable.seek].
|
||
**/
|
||
|
||
static void g_file_input_stream_seekable_iface_init (GSeekableIface *iface);
|
||
static goffset g_file_input_stream_seekable_tell (GSeekable *seekable);
|
||
static gboolean g_file_input_stream_seekable_can_seek (GSeekable *seekable);
|
||
static gboolean g_file_input_stream_seekable_seek (GSeekable *seekable,
|
||
goffset offset,
|
||
GSeekType type,
|
||
GCancellable *cancellable,
|
||
GError **error);
|
||
static gboolean g_file_input_stream_seekable_can_truncate (GSeekable *seekable);
|
||
static gboolean g_file_input_stream_seekable_truncate (GSeekable *seekable,
|
||
goffset offset,
|
||
GCancellable *cancellable,
|
||
GError **error);
|
||
static void g_file_input_stream_real_query_info_async (GFileInputStream *stream,
|
||
const char *attributes,
|
||
int io_priority,
|
||
GCancellable *cancellable,
|
||
GAsyncReadyCallback callback,
|
||
gpointer user_data);
|
||
static GFileInfo *g_file_input_stream_real_query_info_finish (GFileInputStream *stream,
|
||
GAsyncResult *result,
|
||
GError **error);
|
||
|
||
|
||
struct _GFileInputStreamPrivate {
|
||
GAsyncReadyCallback outstanding_callback;
|
||
};
|
||
|
||
G_DEFINE_TYPE_WITH_CODE (GFileInputStream, g_file_input_stream, G_TYPE_INPUT_STREAM,
|
||
G_ADD_PRIVATE (GFileInputStream)
|
||
G_IMPLEMENT_INTERFACE (G_TYPE_SEEKABLE,
|
||
g_file_input_stream_seekable_iface_init))
|
||
|
||
static void
|
||
g_file_input_stream_class_init (GFileInputStreamClass *klass)
|
||
{
|
||
klass->query_info_async = g_file_input_stream_real_query_info_async;
|
||
klass->query_info_finish = g_file_input_stream_real_query_info_finish;
|
||
}
|
||
|
||
static void
|
||
g_file_input_stream_seekable_iface_init (GSeekableIface *iface)
|
||
{
|
||
iface->tell = g_file_input_stream_seekable_tell;
|
||
iface->can_seek = g_file_input_stream_seekable_can_seek;
|
||
iface->seek = g_file_input_stream_seekable_seek;
|
||
iface->can_truncate = g_file_input_stream_seekable_can_truncate;
|
||
iface->truncate_fn = g_file_input_stream_seekable_truncate;
|
||
}
|
||
|
||
static void
|
||
g_file_input_stream_init (GFileInputStream *stream)
|
||
{
|
||
stream->priv = g_file_input_stream_get_instance_private (stream);
|
||
}
|
||
|
||
/**
|
||
* g_file_input_stream_query_info:
|
||
* @stream: a #GFileInputStream.
|
||
* @attributes: a file attribute query string.
|
||
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
|
||
* @error: a #GError location to store the error occurring, or %NULL to
|
||
* ignore.
|
||
*
|
||
* Queries a file input stream the given @attributes. This function blocks
|
||
* while querying the stream. For the asynchronous (non-blocking) version
|
||
* of this function, see g_file_input_stream_query_info_async(). While the
|
||
* stream is blocked, the stream will set the pending flag internally, and
|
||
* any other operations on the stream will fail with %G_IO_ERROR_PENDING.
|
||
*
|
||
* Returns: (transfer full): a #GFileInfo, or %NULL on error.
|
||
**/
|
||
GFileInfo *
|
||
g_file_input_stream_query_info (GFileInputStream *stream,
|
||
const char *attributes,
|
||
GCancellable *cancellable,
|
||
GError **error)
|
||
{
|
||
GFileInputStreamClass *class;
|
||
GInputStream *input_stream;
|
||
GFileInfo *info;
|
||
|
||
g_return_val_if_fail (G_IS_FILE_INPUT_STREAM (stream), NULL);
|
||
|
||
input_stream = G_INPUT_STREAM (stream);
|
||
|
||
if (!g_input_stream_set_pending (input_stream, error))
|
||
return NULL;
|
||
|
||
info = NULL;
|
||
|
||
if (cancellable)
|
||
g_cancellable_push_current (cancellable);
|
||
|
||
class = G_FILE_INPUT_STREAM_GET_CLASS (stream);
|
||
if (class->query_info)
|
||
info = class->query_info (stream, attributes, cancellable, error);
|
||
else
|
||
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
|
||
_("Stream doesn’t support query_info"));
|
||
|
||
if (cancellable)
|
||
g_cancellable_pop_current (cancellable);
|
||
|
||
g_input_stream_clear_pending (input_stream);
|
||
|
||
return info;
|
||
}
|
||
|
||
static void
|
||
async_ready_callback_wrapper (GObject *source_object,
|
||
GAsyncResult *res,
|
||
gpointer user_data)
|
||
{
|
||
GFileInputStream *stream = G_FILE_INPUT_STREAM (source_object);
|
||
|
||
g_input_stream_clear_pending (G_INPUT_STREAM (stream));
|
||
if (stream->priv->outstanding_callback)
|
||
(*stream->priv->outstanding_callback) (source_object, res, user_data);
|
||
g_object_unref (stream);
|
||
}
|
||
|
||
/**
|
||
* g_file_input_stream_query_info_async:
|
||
* @stream: a #GFileInputStream.
|
||
* @attributes: a file attribute query string.
|
||
* @io_priority: the [I/O priority](iface.AsyncResult.html#io-priority) of the request
|
||
* @cancellable: (nullable): optional #GCancellable object, %NULL to ignore.
|
||
* @callback: (scope async): a #GAsyncReadyCallback
|
||
* to call when the request is satisfied
|
||
* @user_data: the data to pass to callback function
|
||
*
|
||
* Queries the stream information asynchronously.
|
||
* When the operation is finished @callback will be called.
|
||
* You can then call g_file_input_stream_query_info_finish()
|
||
* to get the result of the operation.
|
||
*
|
||
* For the synchronous version of this function,
|
||
* see g_file_input_stream_query_info().
|
||
*
|
||
* If @cancellable is not %NULL, then the operation can be cancelled by
|
||
* triggering the cancellable object from another thread. If the operation
|
||
* was cancelled, the error %G_IO_ERROR_CANCELLED will be set
|
||
*
|
||
**/
|
||
void
|
||
g_file_input_stream_query_info_async (GFileInputStream *stream,
|
||
const char *attributes,
|
||
int io_priority,
|
||
GCancellable *cancellable,
|
||
GAsyncReadyCallback callback,
|
||
gpointer user_data)
|
||
{
|
||
GFileInputStreamClass *klass;
|
||
GInputStream *input_stream;
|
||
GError *error = NULL;
|
||
|
||
g_return_if_fail (G_IS_FILE_INPUT_STREAM (stream));
|
||
|
||
input_stream = G_INPUT_STREAM (stream);
|
||
|
||
if (!g_input_stream_set_pending (input_stream, &error))
|
||
{
|
||
g_task_report_error (stream, callback, user_data,
|
||
g_file_input_stream_query_info_async,
|
||
error);
|
||
return;
|
||
}
|
||
|
||
klass = G_FILE_INPUT_STREAM_GET_CLASS (stream);
|
||
|
||
stream->priv->outstanding_callback = callback;
|
||
g_object_ref (stream);
|
||
klass->query_info_async (stream, attributes, io_priority, cancellable,
|
||
async_ready_callback_wrapper, user_data);
|
||
}
|
||
|
||
/**
|
||
* g_file_input_stream_query_info_finish:
|
||
* @stream: a #GFileInputStream.
|
||
* @result: a #GAsyncResult.
|
||
* @error: a #GError location to store the error occurring,
|
||
* or %NULL to ignore.
|
||
*
|
||
* Finishes an asynchronous info query operation.
|
||
*
|
||
* Returns: (transfer full): #GFileInfo.
|
||
**/
|
||
GFileInfo *
|
||
g_file_input_stream_query_info_finish (GFileInputStream *stream,
|
||
GAsyncResult *result,
|
||
GError **error)
|
||
{
|
||
GFileInputStreamClass *class;
|
||
|
||
g_return_val_if_fail (G_IS_FILE_INPUT_STREAM (stream), NULL);
|
||
g_return_val_if_fail (G_IS_ASYNC_RESULT (result), NULL);
|
||
|
||
if (g_async_result_legacy_propagate_error (result, error))
|
||
return NULL;
|
||
else if (g_async_result_is_tagged (result, g_file_input_stream_query_info_async))
|
||
return g_task_propagate_pointer (G_TASK (result), error);
|
||
|
||
class = G_FILE_INPUT_STREAM_GET_CLASS (stream);
|
||
return class->query_info_finish (stream, result, error);
|
||
}
|
||
|
||
static goffset
|
||
g_file_input_stream_tell (GFileInputStream *stream)
|
||
{
|
||
GFileInputStreamClass *class;
|
||
goffset offset;
|
||
|
||
g_return_val_if_fail (G_IS_FILE_INPUT_STREAM (stream), 0);
|
||
|
||
class = G_FILE_INPUT_STREAM_GET_CLASS (stream);
|
||
|
||
offset = 0;
|
||
if (class->tell)
|
||
offset = class->tell (stream);
|
||
|
||
return offset;
|
||
}
|
||
|
||
static goffset
|
||
g_file_input_stream_seekable_tell (GSeekable *seekable)
|
||
{
|
||
return g_file_input_stream_tell (G_FILE_INPUT_STREAM (seekable));
|
||
}
|
||
|
||
static gboolean
|
||
g_file_input_stream_can_seek (GFileInputStream *stream)
|
||
{
|
||
GFileInputStreamClass *class;
|
||
gboolean can_seek;
|
||
|
||
g_return_val_if_fail (G_IS_FILE_INPUT_STREAM (stream), FALSE);
|
||
|
||
class = G_FILE_INPUT_STREAM_GET_CLASS (stream);
|
||
|
||
can_seek = FALSE;
|
||
if (class->seek)
|
||
{
|
||
can_seek = TRUE;
|
||
if (class->can_seek)
|
||
can_seek = class->can_seek (stream);
|
||
}
|
||
|
||
return can_seek;
|
||
}
|
||
|
||
static gboolean
|
||
g_file_input_stream_seekable_can_seek (GSeekable *seekable)
|
||
{
|
||
return g_file_input_stream_can_seek (G_FILE_INPUT_STREAM (seekable));
|
||
}
|
||
|
||
static gboolean
|
||
g_file_input_stream_seek (GFileInputStream *stream,
|
||
goffset offset,
|
||
GSeekType type,
|
||
GCancellable *cancellable,
|
||
GError **error)
|
||
{
|
||
GFileInputStreamClass *class;
|
||
GInputStream *input_stream;
|
||
gboolean res;
|
||
|
||
g_return_val_if_fail (G_IS_FILE_INPUT_STREAM (stream), FALSE);
|
||
|
||
input_stream = G_INPUT_STREAM (stream);
|
||
class = G_FILE_INPUT_STREAM_GET_CLASS (stream);
|
||
|
||
if (!class->seek)
|
||
{
|
||
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
|
||
_("Seek not supported on stream"));
|
||
return FALSE;
|
||
}
|
||
|
||
if (!g_input_stream_set_pending (input_stream, error))
|
||
return FALSE;
|
||
|
||
if (cancellable)
|
||
g_cancellable_push_current (cancellable);
|
||
|
||
res = class->seek (stream, offset, type, cancellable, error);
|
||
|
||
if (cancellable)
|
||
g_cancellable_pop_current (cancellable);
|
||
|
||
g_input_stream_clear_pending (input_stream);
|
||
|
||
return res;
|
||
}
|
||
|
||
static gboolean
|
||
g_file_input_stream_seekable_seek (GSeekable *seekable,
|
||
goffset offset,
|
||
GSeekType type,
|
||
GCancellable *cancellable,
|
||
GError **error)
|
||
{
|
||
return g_file_input_stream_seek (G_FILE_INPUT_STREAM (seekable),
|
||
offset, type, cancellable, error);
|
||
}
|
||
|
||
static gboolean
|
||
g_file_input_stream_seekable_can_truncate (GSeekable *seekable)
|
||
{
|
||
return FALSE;
|
||
}
|
||
|
||
static gboolean
|
||
g_file_input_stream_seekable_truncate (GSeekable *seekable,
|
||
goffset offset,
|
||
GCancellable *cancellable,
|
||
GError **error)
|
||
{
|
||
g_set_error_literal (error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
|
||
_("Truncate not allowed on input stream"));
|
||
return FALSE;
|
||
}
|
||
|
||
/********************************************
|
||
* Default implementation of async ops *
|
||
********************************************/
|
||
|
||
static void
|
||
query_info_async_thread (GTask *task,
|
||
gpointer source_object,
|
||
gpointer task_data,
|
||
GCancellable *cancellable)
|
||
{
|
||
GFileInputStream *stream = source_object;
|
||
const char *attributes = task_data;
|
||
GFileInputStreamClass *class;
|
||
GError *error = NULL;
|
||
GFileInfo *info = NULL;
|
||
|
||
class = G_FILE_INPUT_STREAM_GET_CLASS (stream);
|
||
if (class->query_info)
|
||
info = class->query_info (stream, attributes, cancellable, &error);
|
||
else
|
||
g_set_error_literal (&error, G_IO_ERROR, G_IO_ERROR_NOT_SUPPORTED,
|
||
_("Stream doesn’t support query_info"));
|
||
|
||
if (info == NULL)
|
||
g_task_return_error (task, error);
|
||
else
|
||
g_task_return_pointer (task, info, g_object_unref);
|
||
}
|
||
|
||
static void
|
||
g_file_input_stream_real_query_info_async (GFileInputStream *stream,
|
||
const char *attributes,
|
||
int io_priority,
|
||
GCancellable *cancellable,
|
||
GAsyncReadyCallback callback,
|
||
gpointer user_data)
|
||
{
|
||
GTask *task;
|
||
|
||
task = g_task_new (stream, cancellable, callback, user_data);
|
||
g_task_set_source_tag (task, g_file_input_stream_real_query_info_async);
|
||
g_task_set_task_data (task, g_strdup (attributes), g_free);
|
||
g_task_set_priority (task, io_priority);
|
||
|
||
g_task_run_in_thread (task, query_info_async_thread);
|
||
g_object_unref (task);
|
||
}
|
||
|
||
static GFileInfo *
|
||
g_file_input_stream_real_query_info_finish (GFileInputStream *stream,
|
||
GAsyncResult *res,
|
||
GError **error)
|
||
{
|
||
g_return_val_if_fail (g_task_is_valid (res, stream), NULL);
|
||
|
||
return g_task_propagate_pointer (G_TASK (res), error);
|
||
}
|