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1 | /* |
2 | * QEMU I/O channels null driver | |
3 | * | |
4 | * Copyright (c) 2022 Red Hat, Inc. | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2.1 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This library is distributed in the hope that it will be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public | |
17 | * License along with this library; if not, see <http://www.gnu.org/licenses/>. | |
18 | * | |
19 | */ | |
20 | ||
21 | #include "qemu/osdep.h" | |
22 | #include "io/channel-null.h" | |
23 | #include "io/channel-watch.h" | |
24 | #include "qapi/error.h" | |
25 | #include "trace.h" | |
26 | #include "qemu/iov.h" | |
27 | ||
28 | typedef struct QIOChannelNullSource QIOChannelNullSource; | |
29 | struct QIOChannelNullSource { | |
30 | GSource parent; | |
31 | QIOChannel *ioc; | |
32 | GIOCondition condition; | |
33 | }; | |
34 | ||
35 | ||
36 | QIOChannelNull * | |
37 | qio_channel_null_new(void) | |
38 | { | |
39 | QIOChannelNull *ioc; | |
40 | ||
41 | ioc = QIO_CHANNEL_NULL(object_new(TYPE_QIO_CHANNEL_NULL)); | |
42 | ||
43 | trace_qio_channel_null_new(ioc); | |
44 | ||
45 | return ioc; | |
46 | } | |
47 | ||
48 | ||
49 | static void | |
50 | qio_channel_null_init(Object *obj) | |
51 | { | |
52 | QIOChannelNull *ioc = QIO_CHANNEL_NULL(obj); | |
53 | ioc->closed = false; | |
54 | } | |
55 | ||
56 | ||
57 | static ssize_t | |
58 | qio_channel_null_readv(QIOChannel *ioc, | |
59 | const struct iovec *iov, | |
60 | size_t niov, | |
61 | int **fds G_GNUC_UNUSED, | |
62 | size_t *nfds G_GNUC_UNUSED, | |
63 | Error **errp) | |
64 | { | |
65 | QIOChannelNull *nioc = QIO_CHANNEL_NULL(ioc); | |
66 | ||
67 | if (nioc->closed) { | |
68 | error_setg_errno(errp, EINVAL, | |
69 | "Channel is closed"); | |
70 | return -1; | |
71 | } | |
72 | ||
73 | return 0; | |
74 | } | |
75 | ||
76 | ||
77 | static ssize_t | |
78 | qio_channel_null_writev(QIOChannel *ioc, | |
79 | const struct iovec *iov, | |
80 | size_t niov, | |
81 | int *fds G_GNUC_UNUSED, | |
82 | size_t nfds G_GNUC_UNUSED, | |
83 | int flags G_GNUC_UNUSED, | |
84 | Error **errp) | |
85 | { | |
86 | QIOChannelNull *nioc = QIO_CHANNEL_NULL(ioc); | |
87 | ||
88 | if (nioc->closed) { | |
89 | error_setg_errno(errp, EINVAL, | |
90 | "Channel is closed"); | |
91 | return -1; | |
92 | } | |
93 | ||
94 | return iov_size(iov, niov); | |
95 | } | |
96 | ||
97 | ||
98 | static int | |
99 | qio_channel_null_set_blocking(QIOChannel *ioc G_GNUC_UNUSED, | |
100 | bool enabled G_GNUC_UNUSED, | |
101 | Error **errp G_GNUC_UNUSED) | |
102 | { | |
103 | return 0; | |
104 | } | |
105 | ||
106 | ||
107 | static off_t | |
108 | qio_channel_null_seek(QIOChannel *ioc G_GNUC_UNUSED, | |
109 | off_t offset G_GNUC_UNUSED, | |
110 | int whence G_GNUC_UNUSED, | |
111 | Error **errp G_GNUC_UNUSED) | |
112 | { | |
113 | return 0; | |
114 | } | |
115 | ||
116 | ||
117 | static int | |
118 | qio_channel_null_close(QIOChannel *ioc, | |
119 | Error **errp G_GNUC_UNUSED) | |
120 | { | |
121 | QIOChannelNull *nioc = QIO_CHANNEL_NULL(ioc); | |
122 | ||
123 | nioc->closed = true; | |
124 | return 0; | |
125 | } | |
126 | ||
127 | ||
128 | static void | |
129 | qio_channel_null_set_aio_fd_handler(QIOChannel *ioc G_GNUC_UNUSED, | |
130 | AioContext *ctx G_GNUC_UNUSED, | |
131 | IOHandler *io_read G_GNUC_UNUSED, | |
132 | IOHandler *io_write G_GNUC_UNUSED, | |
133 | void *opaque G_GNUC_UNUSED) | |
134 | { | |
135 | } | |
136 | ||
137 | ||
138 | static gboolean | |
139 | qio_channel_null_source_prepare(GSource *source G_GNUC_UNUSED, | |
140 | gint *timeout) | |
141 | { | |
142 | *timeout = -1; | |
143 | ||
144 | return TRUE; | |
145 | } | |
146 | ||
147 | ||
148 | static gboolean | |
149 | qio_channel_null_source_check(GSource *source G_GNUC_UNUSED) | |
150 | { | |
151 | return TRUE; | |
152 | } | |
153 | ||
154 | ||
155 | static gboolean | |
156 | qio_channel_null_source_dispatch(GSource *source, | |
157 | GSourceFunc callback, | |
158 | gpointer user_data) | |
159 | { | |
160 | QIOChannelFunc func = (QIOChannelFunc)callback; | |
161 | QIOChannelNullSource *ssource = (QIOChannelNullSource *)source; | |
162 | ||
163 | return (*func)(ssource->ioc, | |
164 | ssource->condition, | |
165 | user_data); | |
166 | } | |
167 | ||
168 | ||
169 | static void | |
170 | qio_channel_null_source_finalize(GSource *source) | |
171 | { | |
172 | QIOChannelNullSource *ssource = (QIOChannelNullSource *)source; | |
173 | ||
174 | object_unref(OBJECT(ssource->ioc)); | |
175 | } | |
176 | ||
177 | ||
178 | GSourceFuncs qio_channel_null_source_funcs = { | |
179 | qio_channel_null_source_prepare, | |
180 | qio_channel_null_source_check, | |
181 | qio_channel_null_source_dispatch, | |
182 | qio_channel_null_source_finalize | |
183 | }; | |
184 | ||
185 | ||
186 | static GSource * | |
187 | qio_channel_null_create_watch(QIOChannel *ioc, | |
188 | GIOCondition condition) | |
189 | { | |
190 | GSource *source; | |
191 | QIOChannelNullSource *ssource; | |
192 | ||
193 | source = g_source_new(&qio_channel_null_source_funcs, | |
194 | sizeof(QIOChannelNullSource)); | |
195 | ssource = (QIOChannelNullSource *)source; | |
196 | ||
197 | ssource->ioc = ioc; | |
198 | object_ref(OBJECT(ioc)); | |
199 | ||
200 | ssource->condition = condition; | |
201 | ||
202 | return source; | |
203 | } | |
204 | ||
205 | ||
206 | static void | |
207 | qio_channel_null_class_init(ObjectClass *klass, | |
208 | void *class_data G_GNUC_UNUSED) | |
209 | { | |
210 | QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass); | |
211 | ||
212 | ioc_klass->io_writev = qio_channel_null_writev; | |
213 | ioc_klass->io_readv = qio_channel_null_readv; | |
214 | ioc_klass->io_set_blocking = qio_channel_null_set_blocking; | |
215 | ioc_klass->io_seek = qio_channel_null_seek; | |
216 | ioc_klass->io_close = qio_channel_null_close; | |
217 | ioc_klass->io_create_watch = qio_channel_null_create_watch; | |
218 | ioc_klass->io_set_aio_fd_handler = qio_channel_null_set_aio_fd_handler; | |
219 | } | |
220 | ||
221 | ||
222 | static const TypeInfo qio_channel_null_info = { | |
223 | .parent = TYPE_QIO_CHANNEL, | |
224 | .name = TYPE_QIO_CHANNEL_NULL, | |
225 | .instance_size = sizeof(QIOChannelNull), | |
226 | .instance_init = qio_channel_null_init, | |
227 | .class_init = qio_channel_null_class_init, | |
228 | }; | |
229 | ||
230 | ||
231 | static void | |
232 | qio_channel_null_register_types(void) | |
233 | { | |
234 | type_register_static(&qio_channel_null_info); | |
235 | } | |
236 | ||
237 | type_init(qio_channel_null_register_types); |