1/* GIO - GLib Input, Output and Streaming Library
2 *
3 * Copyright (C) 2010 Red Hat, Inc.
4 *
5 * This library is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU Lesser General Public
7 * License as published by the Free Software Foundation; either
8 * version 2.1 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, see <http://www.gnu.org/licenses/>.
17 */
18
19#ifndef __G_POLLABLE_OUTPUT_STREAM_H__
20#define __G_POLLABLE_OUTPUT_STREAM_H__
21
22#if !defined (__GIO_GIO_H_INSIDE__) && !defined (GIO_COMPILATION)
23#error "Only <gio/gio.h> can be included directly."
24#endif
25
26#include <gio/gio.h>
27
28G_BEGIN_DECLS
29
30#define G_TYPE_POLLABLE_OUTPUT_STREAM (g_pollable_output_stream_get_type ())
31#define G_POLLABLE_OUTPUT_STREAM(obj) (G_TYPE_CHECK_INSTANCE_CAST ((obj), G_TYPE_POLLABLE_OUTPUT_STREAM, GPollableOutputStream))
32#define G_IS_POLLABLE_OUTPUT_STREAM(obj) (G_TYPE_CHECK_INSTANCE_TYPE ((obj), G_TYPE_POLLABLE_OUTPUT_STREAM))
33#define G_POLLABLE_OUTPUT_STREAM_GET_INTERFACE(obj) (G_TYPE_INSTANCE_GET_INTERFACE ((obj), G_TYPE_POLLABLE_OUTPUT_STREAM, GPollableOutputStreamInterface))
34
35/**
36 * GPollableOutputStream:
37 *
38 * An interface for a #GOutputStream that can be polled for writeability.
39 *
40 * Since: 2.28
41 */
42typedef struct _GPollableOutputStreamInterface GPollableOutputStreamInterface;
43
44/**
45 * GPollableOutputStreamInterface:
46 * @g_iface: The parent interface.
47 * @can_poll: Checks if the #GPollableOutputStream instance is actually pollable
48 * @is_writable: Checks if the stream is writable
49 * @create_source: Creates a #GSource to poll the stream
50 * @write_nonblocking: Does a non-blocking write or returns
51 * %G_IO_ERROR_WOULD_BLOCK
52 * @writev_nonblocking: Does a vectored non-blocking write, or returns
53 * %G_POLLABLE_RETURN_WOULD_BLOCK
54 *
55 * The interface for pollable output streams.
56 *
57 * The default implementation of @can_poll always returns %TRUE.
58 *
59 * The default implementation of @write_nonblocking calls
60 * g_pollable_output_stream_is_writable(), and then calls
61 * g_output_stream_write() if it returns %TRUE. This means you only
62 * need to override it if it is possible that your @is_writable
63 * implementation may return %TRUE when the stream is not actually
64 * writable.
65 *
66 * The default implementation of @writev_nonblocking calls
67 * g_pollable_output_stream_write_nonblocking() for each vector, and converts
68 * its return value and error (if set) to a #GPollableReturn. You should
69 * override this where possible to avoid having to allocate a #GError to return
70 * %G_IO_ERROR_WOULD_BLOCK.
71 *
72 * Since: 2.28
73 */
74struct _GPollableOutputStreamInterface
75{
76 GTypeInterface g_iface;
77
78 /* Virtual Table */
79 gboolean (*can_poll) (GPollableOutputStream *stream);
80
81 gboolean (*is_writable) (GPollableOutputStream *stream);
82 GSource * (*create_source) (GPollableOutputStream *stream,
83 GCancellable *cancellable);
84 gssize (*write_nonblocking) (GPollableOutputStream *stream,
85 const void *buffer,
86 gsize count,
87 GError **error);
88 GPollableReturn (*writev_nonblocking) (GPollableOutputStream *stream,
89 const GOutputVector *vectors,
90 gsize n_vectors,
91 gsize *bytes_written,
92 GError **error);
93};
94
95GLIB_AVAILABLE_IN_ALL
96GType g_pollable_output_stream_get_type (void) G_GNUC_CONST;
97
98GLIB_AVAILABLE_IN_ALL
99gboolean g_pollable_output_stream_can_poll (GPollableOutputStream *stream);
100
101GLIB_AVAILABLE_IN_ALL
102gboolean g_pollable_output_stream_is_writable (GPollableOutputStream *stream);
103GLIB_AVAILABLE_IN_ALL
104GSource *g_pollable_output_stream_create_source (GPollableOutputStream *stream,
105 GCancellable *cancellable);
106
107GLIB_AVAILABLE_IN_ALL
108gssize g_pollable_output_stream_write_nonblocking (GPollableOutputStream *stream,
109 const void *buffer,
110 gsize count,
111 GCancellable *cancellable,
112 GError **error);
113
114GLIB_AVAILABLE_IN_2_60
115GPollableReturn g_pollable_output_stream_writev_nonblocking (GPollableOutputStream *stream,
116 const GOutputVector *vectors,
117 gsize n_vectors,
118 gsize *bytes_written,
119 GCancellable *cancellable,
120 GError **error);
121
122G_END_DECLS
123
124
125#endif /* __G_POLLABLE_OUTPUT_STREAM_H__ */
126

source code of gtk/subprojects/glib/gio/gpollableoutputstream.h