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666a3af9 DB |
1 | /* |
2 | * QEMU I/O channels | |
3 | * | |
4 | * Copyright (c) 2015 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 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 | ||
cae9fc56 | 21 | #include "qemu/osdep.h" |
666a3af9 | 22 | #include "io/channel.h" |
da34e65c | 23 | #include "qapi/error.h" |
666a3af9 DB |
24 | #include "qemu/coroutine.h" |
25 | ||
26 | bool qio_channel_has_feature(QIOChannel *ioc, | |
27 | QIOChannelFeature feature) | |
28 | { | |
29 | return ioc->features & (1 << feature); | |
30 | } | |
31 | ||
32 | ||
33 | ssize_t qio_channel_readv_full(QIOChannel *ioc, | |
34 | const struct iovec *iov, | |
35 | size_t niov, | |
36 | int **fds, | |
37 | size_t *nfds, | |
38 | Error **errp) | |
39 | { | |
40 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
41 | ||
42 | if ((fds || nfds) && | |
43 | !(ioc->features & (1 << QIO_CHANNEL_FEATURE_FD_PASS))) { | |
44 | error_setg_errno(errp, EINVAL, | |
45 | "Channel does not support file descriptor passing"); | |
46 | return -1; | |
47 | } | |
48 | ||
49 | return klass->io_readv(ioc, iov, niov, fds, nfds, errp); | |
50 | } | |
51 | ||
52 | ||
53 | ssize_t qio_channel_writev_full(QIOChannel *ioc, | |
54 | const struct iovec *iov, | |
55 | size_t niov, | |
56 | int *fds, | |
57 | size_t nfds, | |
58 | Error **errp) | |
59 | { | |
60 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
61 | ||
62 | if ((fds || nfds) && | |
63 | !(ioc->features & (1 << QIO_CHANNEL_FEATURE_FD_PASS))) { | |
64 | error_setg_errno(errp, EINVAL, | |
65 | "Channel does not support file descriptor passing"); | |
66 | return -1; | |
67 | } | |
68 | ||
69 | return klass->io_writev(ioc, iov, niov, fds, nfds, errp); | |
70 | } | |
71 | ||
72 | ||
73 | ssize_t qio_channel_readv(QIOChannel *ioc, | |
74 | const struct iovec *iov, | |
75 | size_t niov, | |
76 | Error **errp) | |
77 | { | |
78 | return qio_channel_readv_full(ioc, iov, niov, NULL, NULL, errp); | |
79 | } | |
80 | ||
81 | ||
82 | ssize_t qio_channel_writev(QIOChannel *ioc, | |
83 | const struct iovec *iov, | |
84 | size_t niov, | |
85 | Error **errp) | |
86 | { | |
87 | return qio_channel_writev_full(ioc, iov, niov, NULL, 0, errp); | |
88 | } | |
89 | ||
90 | ||
91 | ssize_t qio_channel_read(QIOChannel *ioc, | |
92 | char *buf, | |
93 | size_t buflen, | |
94 | Error **errp) | |
95 | { | |
96 | struct iovec iov = { .iov_base = buf, .iov_len = buflen }; | |
97 | return qio_channel_readv_full(ioc, &iov, 1, NULL, NULL, errp); | |
98 | } | |
99 | ||
100 | ||
101 | ssize_t qio_channel_write(QIOChannel *ioc, | |
102 | const char *buf, | |
103 | size_t buflen, | |
104 | Error **errp) | |
105 | { | |
106 | struct iovec iov = { .iov_base = (char *)buf, .iov_len = buflen }; | |
107 | return qio_channel_writev_full(ioc, &iov, 1, NULL, 0, errp); | |
108 | } | |
109 | ||
110 | ||
111 | int qio_channel_set_blocking(QIOChannel *ioc, | |
112 | bool enabled, | |
113 | Error **errp) | |
114 | { | |
115 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
116 | return klass->io_set_blocking(ioc, enabled, errp); | |
117 | } | |
118 | ||
119 | ||
120 | int qio_channel_close(QIOChannel *ioc, | |
121 | Error **errp) | |
122 | { | |
123 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
124 | return klass->io_close(ioc, errp); | |
125 | } | |
126 | ||
127 | ||
128 | GSource *qio_channel_create_watch(QIOChannel *ioc, | |
129 | GIOCondition condition) | |
130 | { | |
131 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
132 | return klass->io_create_watch(ioc, condition); | |
133 | } | |
134 | ||
135 | ||
136 | guint qio_channel_add_watch(QIOChannel *ioc, | |
137 | GIOCondition condition, | |
138 | QIOChannelFunc func, | |
139 | gpointer user_data, | |
140 | GDestroyNotify notify) | |
141 | { | |
142 | GSource *source; | |
143 | guint id; | |
144 | ||
145 | source = qio_channel_create_watch(ioc, condition); | |
146 | ||
147 | g_source_set_callback(source, (GSourceFunc)func, user_data, notify); | |
148 | ||
149 | id = g_source_attach(source, NULL); | |
150 | g_source_unref(source); | |
151 | ||
152 | return id; | |
153 | } | |
154 | ||
155 | ||
156 | int qio_channel_shutdown(QIOChannel *ioc, | |
157 | QIOChannelShutdown how, | |
158 | Error **errp) | |
159 | { | |
160 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
161 | ||
162 | if (!klass->io_shutdown) { | |
163 | error_setg(errp, "Data path shutdown not supported"); | |
164 | return -1; | |
165 | } | |
166 | ||
167 | return klass->io_shutdown(ioc, how, errp); | |
168 | } | |
169 | ||
170 | ||
171 | void qio_channel_set_delay(QIOChannel *ioc, | |
172 | bool enabled) | |
173 | { | |
174 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
175 | ||
176 | if (klass->io_set_delay) { | |
177 | klass->io_set_delay(ioc, enabled); | |
178 | } | |
179 | } | |
180 | ||
181 | ||
182 | void qio_channel_set_cork(QIOChannel *ioc, | |
183 | bool enabled) | |
184 | { | |
185 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
186 | ||
187 | if (klass->io_set_cork) { | |
188 | klass->io_set_cork(ioc, enabled); | |
189 | } | |
190 | } | |
191 | ||
192 | ||
193 | off_t qio_channel_io_seek(QIOChannel *ioc, | |
194 | off_t offset, | |
195 | int whence, | |
196 | Error **errp) | |
197 | { | |
198 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
199 | ||
200 | if (!klass->io_seek) { | |
201 | error_setg(errp, "Channel does not support random access"); | |
202 | return -1; | |
203 | } | |
204 | ||
205 | return klass->io_seek(ioc, offset, whence, errp); | |
206 | } | |
207 | ||
208 | ||
209 | typedef struct QIOChannelYieldData QIOChannelYieldData; | |
210 | struct QIOChannelYieldData { | |
211 | QIOChannel *ioc; | |
212 | Coroutine *co; | |
213 | }; | |
214 | ||
215 | ||
216 | static gboolean qio_channel_yield_enter(QIOChannel *ioc, | |
217 | GIOCondition condition, | |
218 | gpointer opaque) | |
219 | { | |
220 | QIOChannelYieldData *data = opaque; | |
0b8b8753 | 221 | qemu_coroutine_enter(data->co); |
666a3af9 DB |
222 | return FALSE; |
223 | } | |
224 | ||
225 | ||
226 | void coroutine_fn qio_channel_yield(QIOChannel *ioc, | |
227 | GIOCondition condition) | |
228 | { | |
229 | QIOChannelYieldData data; | |
230 | ||
231 | assert(qemu_in_coroutine()); | |
232 | data.ioc = ioc; | |
233 | data.co = qemu_coroutine_self(); | |
234 | qio_channel_add_watch(ioc, | |
235 | condition, | |
236 | qio_channel_yield_enter, | |
237 | &data, | |
238 | NULL); | |
239 | qemu_coroutine_yield(); | |
240 | } | |
241 | ||
242 | ||
243 | static gboolean qio_channel_wait_complete(QIOChannel *ioc, | |
244 | GIOCondition condition, | |
245 | gpointer opaque) | |
246 | { | |
247 | GMainLoop *loop = opaque; | |
248 | ||
249 | g_main_loop_quit(loop); | |
250 | return FALSE; | |
251 | } | |
252 | ||
253 | ||
254 | void qio_channel_wait(QIOChannel *ioc, | |
255 | GIOCondition condition) | |
256 | { | |
257 | GMainContext *ctxt = g_main_context_new(); | |
258 | GMainLoop *loop = g_main_loop_new(ctxt, TRUE); | |
259 | GSource *source; | |
260 | ||
261 | source = qio_channel_create_watch(ioc, condition); | |
262 | ||
263 | g_source_set_callback(source, | |
264 | (GSourceFunc)qio_channel_wait_complete, | |
265 | loop, | |
266 | NULL); | |
267 | ||
268 | g_source_attach(source, ctxt); | |
269 | ||
270 | g_main_loop_run(loop); | |
271 | ||
272 | g_source_unref(source); | |
273 | g_main_loop_unref(loop); | |
274 | g_main_context_unref(ctxt); | |
275 | } | |
276 | ||
277 | ||
a5897205 PB |
278 | #ifdef _WIN32 |
279 | static void qio_channel_finalize(Object *obj) | |
280 | { | |
281 | QIOChannel *ioc = QIO_CHANNEL(obj); | |
282 | ||
283 | if (ioc->event) { | |
284 | CloseHandle(ioc->event); | |
285 | } | |
286 | } | |
287 | #endif | |
288 | ||
666a3af9 DB |
289 | static const TypeInfo qio_channel_info = { |
290 | .parent = TYPE_OBJECT, | |
291 | .name = TYPE_QIO_CHANNEL, | |
292 | .instance_size = sizeof(QIOChannel), | |
a5897205 PB |
293 | #ifdef _WIN32 |
294 | .instance_finalize = qio_channel_finalize, | |
295 | #endif | |
666a3af9 DB |
296 | .abstract = true, |
297 | .class_size = sizeof(QIOChannelClass), | |
298 | }; | |
299 | ||
300 | ||
301 | static void qio_channel_register_types(void) | |
302 | { | |
303 | type_register_static(&qio_channel_info); | |
304 | } | |
305 | ||
306 | ||
307 | type_init(qio_channel_register_types); |