glib/gio/gpollableutils.c
Dan Winship 8f80fbb2a7 Remove some unnecessary source prepare/check functions
GPollableSource and GSocket's "broken" source never trigger on their
own, so with the changes to GSources in the last cycle, their check
and prepare functions are unnecessary (and undesired).

https://bugzilla.gnome.org/show_bug.cgi?id=701511
2013-07-13 16:38:55 -04:00

336 lines
9.8 KiB
C

/* GIO - GLib Input, Output and Streaming Library
*
* Copyright (C) 2010 Red Hat, Inc.
*
* 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 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, write to the
* Free Software Foundation, Inc., 59 Temple Place, Suite 330,
* Boston, MA 02111-1307, USA.
*/
#include "config.h"
#include <errno.h>
#include "gpollableinputstream.h"
#include "gasynchelper.h"
#include "glibintl.h"
/**
* SECTION:gpollableutils
* @short_description: Utilities for pollable streams
* @include: gio/gio.h
*
* Utility functions for #GPollableInputStream and
* #GPollableOutputStream implementations.
*/
typedef struct {
GSource source;
GObject *stream;
} GPollableSource;
static gboolean
pollable_source_dispatch (GSource *source,
GSourceFunc callback,
gpointer user_data)
{
GPollableSourceFunc func = (GPollableSourceFunc)callback;
GPollableSource *pollable_source = (GPollableSource *)source;
return (*func) (pollable_source->stream, user_data);
}
static void
pollable_source_finalize (GSource *source)
{
GPollableSource *pollable_source = (GPollableSource *)source;
g_object_unref (pollable_source->stream);
}
static gboolean
pollable_source_closure_callback (GObject *stream,
gpointer data)
{
GClosure *closure = data;
GValue param = G_VALUE_INIT;
GValue result_value = G_VALUE_INIT;
gboolean result;
g_value_init (&result_value, G_TYPE_BOOLEAN);
g_value_init (&param, G_TYPE_OBJECT);
g_value_set_object (&param, stream);
g_closure_invoke (closure, &result_value, 1, &param, NULL);
result = g_value_get_boolean (&result_value);
g_value_unset (&result_value);
g_value_unset (&param);
return result;
}
static GSourceFuncs pollable_source_funcs =
{
NULL,
NULL,
pollable_source_dispatch,
pollable_source_finalize,
(GSourceFunc)pollable_source_closure_callback,
};
/**
* g_pollable_source_new:
* @pollable_stream: the stream associated with the new source
*
* Utility method for #GPollableInputStream and #GPollableOutputStream
* implementations. Creates a new #GSource that expects a callback of
* type #GPollableSourceFunc. The new source does not actually do
* anything on its own; use g_source_add_child_source() to add other
* sources to it to cause it to trigger.
*
* Return value: (transfer full): the new #GSource.
*
* Since: 2.28
*/
GSource *
g_pollable_source_new (GObject *pollable_stream)
{
GSource *source;
GPollableSource *pollable_source;
g_return_val_if_fail (G_IS_POLLABLE_INPUT_STREAM (pollable_stream) ||
G_IS_POLLABLE_OUTPUT_STREAM (pollable_stream), NULL);
source = g_source_new (&pollable_source_funcs, sizeof (GPollableSource));
g_source_set_name (source, "GPollableSource");
pollable_source = (GPollableSource *)source;
pollable_source->stream = g_object_ref (pollable_stream);
return source;
}
/**
* g_pollable_source_new_full:
* @pollable_stream: (type GObject): the stream associated with the
* new source
* @child_source: (allow-none): optional child source to attach
* @cancellable: (allow-none): optional #GCancellable to attach
*
* Utility method for #GPollableInputStream and #GPollableOutputStream
* implementations. Creates a new #GSource, as with
* g_pollable_source_new(), but also attaching @child_source (with a
* dummy callback), and @cancellable, if they are non-%NULL.
*
* Return value: (transfer full): the new #GSource.
*
* Since: 2.34
*/
GSource *
g_pollable_source_new_full (gpointer pollable_stream,
GSource *child_source,
GCancellable *cancellable)
{
GSource *source;
g_return_val_if_fail (G_IS_POLLABLE_INPUT_STREAM (pollable_stream) ||
G_IS_POLLABLE_OUTPUT_STREAM (pollable_stream), NULL);
source = g_pollable_source_new (pollable_stream);
if (child_source)
{
g_source_set_dummy_callback (child_source);
g_source_add_child_source (source, child_source);
}
if (cancellable)
{
GSource *cancellable_source = g_cancellable_source_new (cancellable);
g_source_set_dummy_callback (cancellable_source);
g_source_add_child_source (source, cancellable_source);
g_source_unref (cancellable_source);
}
return source;
}
/**
* g_pollable_stream_read:
* @stream: a #GInputStream
* @buffer: a buffer to read data into
* @count: the number of bytes to read
* @blocking: whether to do blocking I/O
* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
* @error: location to store the error occurring, or %NULL to ignore
*
* Tries to read from @stream, as with g_input_stream_read() (if
* @blocking is %TRUE) or g_pollable_input_stream_read_nonblocking()
* (if @blocking is %FALSE). This can be used to more easily share
* code between blocking and non-blocking implementations of a method.
*
* If @blocking is %FALSE, then @stream must be a
* #GPollableInputStream for which g_pollable_input_stream_can_poll()
* returns %TRUE, or else the behavior is undefined. If @blocking is
* %TRUE, then @stream does not need to be a #GPollableInputStream.
*
* Returns: the number of bytes read, or -1 on error.
*
* Since: 2.34
*/
gssize
g_pollable_stream_read (GInputStream *stream,
void *buffer,
gsize count,
gboolean blocking,
GCancellable *cancellable,
GError **error)
{
if (blocking)
{
return g_input_stream_read (stream,
buffer, count,
cancellable, error);
}
else
{
return g_pollable_input_stream_read_nonblocking (G_POLLABLE_INPUT_STREAM (stream),
buffer, count,
cancellable, error);
}
}
/**
* g_pollable_stream_write:
* @stream: a #GOutputStream.
* @buffer: (array length=count) (element-type guint8): the buffer
* containing the data to write.
* @count: the number of bytes to write
* @blocking: whether to do blocking I/O
* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
* @error: location to store the error occurring, or %NULL to ignore
*
* Tries to write to @stream, as with g_output_stream_write() (if
* @blocking is %TRUE) or g_pollable_output_stream_write_nonblocking()
* (if @blocking is %FALSE). This can be used to more easily share
* code between blocking and non-blocking implementations of a method.
*
* If @blocking is %FALSE, then @stream must be a
* #GPollableOutputStream for which
* g_pollable_output_stream_can_poll() returns %TRUE or else the
* behavior is undefined. If @blocking is %TRUE, then @stream does not
* need to be a #GPollableOutputStream.
*
* Returns: the number of bytes written, or -1 on error.
*
* Since: 2.34
*/
gssize
g_pollable_stream_write (GOutputStream *stream,
const void *buffer,
gsize count,
gboolean blocking,
GCancellable *cancellable,
GError **error)
{
if (blocking)
{
return g_output_stream_write (stream,
buffer, count,
cancellable, error);
}
else
{
return g_pollable_output_stream_write_nonblocking (G_POLLABLE_OUTPUT_STREAM (stream),
buffer, count,
cancellable, error);
}
}
/**
* g_pollable_stream_write_all:
* @stream: a #GOutputStream.
* @buffer: (array length=count) (element-type guint8): the buffer
* containing the data to write.
* @count: the number of bytes to write
* @blocking: whether to do blocking I/O
* @bytes_written: (out): location to store the number of bytes that was
* written to the stream
* @cancellable: (allow-none): optional #GCancellable object, %NULL to ignore.
* @error: location to store the error occurring, or %NULL to ignore
*
* Tries to write @count bytes to @stream, as with
* g_output_stream_write_all(), but using g_pollable_stream_write()
* rather than g_output_stream_write().
*
* On a successful write of @count bytes, %TRUE is returned, and
* @bytes_written is set to @count.
*
* If there is an error during the operation (including
* %G_IO_ERROR_WOULD_BLOCK in the non-blocking case), %FALSE is
* returned and @error is set to indicate the error status,
* @bytes_written is updated to contain the number of bytes written
* into the stream before the error occurred.
*
* As with g_pollable_stream_write(), if @blocking is %FALSE, then
* @stream must be a #GPollableOutputStream for which
* g_pollable_output_stream_can_poll() returns %TRUE or else the
* behavior is undefined. If @blocking is %TRUE, then @stream does not
* need to be a #GPollableOutputStream.
*
* Return value: %TRUE on success, %FALSE if there was an error
*
* Since: 2.34
*/
gboolean
g_pollable_stream_write_all (GOutputStream *stream,
const void *buffer,
gsize count,
gboolean blocking,
gsize *bytes_written,
GCancellable *cancellable,
GError **error)
{
gsize _bytes_written;
gssize res;
_bytes_written = 0;
while (_bytes_written < count)
{
res = g_pollable_stream_write (stream,
(char *)buffer + _bytes_written,
count - _bytes_written,
blocking,
cancellable, error);
if (res == -1)
{
if (bytes_written)
*bytes_written = _bytes_written;
return FALSE;
}
if (res == 0)
g_warning ("Write returned zero without error");
_bytes_written += res;
}
if (bytes_written)
*bytes_written = _bytes_written;
return TRUE;
}