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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 | ||
d8d3c7cc FF |
33 | void qio_channel_set_feature(QIOChannel *ioc, |
34 | QIOChannelFeature feature) | |
35 | { | |
36 | ioc->features |= (1 << feature); | |
37 | } | |
38 | ||
39 | ||
20f4aa26 DB |
40 | void qio_channel_set_name(QIOChannel *ioc, |
41 | const char *name) | |
42 | { | |
43 | g_free(ioc->name); | |
44 | ioc->name = g_strdup(name); | |
45 | } | |
46 | ||
47 | ||
666a3af9 DB |
48 | ssize_t qio_channel_readv_full(QIOChannel *ioc, |
49 | const struct iovec *iov, | |
50 | size_t niov, | |
51 | int **fds, | |
52 | size_t *nfds, | |
53 | Error **errp) | |
54 | { | |
55 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
56 | ||
57 | if ((fds || nfds) && | |
e413ae0c | 58 | !qio_channel_has_feature(ioc, QIO_CHANNEL_FEATURE_FD_PASS)) { |
666a3af9 DB |
59 | error_setg_errno(errp, EINVAL, |
60 | "Channel does not support file descriptor passing"); | |
61 | return -1; | |
62 | } | |
63 | ||
64 | return klass->io_readv(ioc, iov, niov, fds, nfds, errp); | |
65 | } | |
66 | ||
67 | ||
68 | ssize_t qio_channel_writev_full(QIOChannel *ioc, | |
69 | const struct iovec *iov, | |
70 | size_t niov, | |
71 | int *fds, | |
72 | size_t nfds, | |
73 | Error **errp) | |
74 | { | |
75 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
76 | ||
77 | if ((fds || nfds) && | |
e413ae0c | 78 | !qio_channel_has_feature(ioc, QIO_CHANNEL_FEATURE_FD_PASS)) { |
666a3af9 DB |
79 | error_setg_errno(errp, EINVAL, |
80 | "Channel does not support file descriptor passing"); | |
81 | return -1; | |
82 | } | |
83 | ||
84 | return klass->io_writev(ioc, iov, niov, fds, nfds, errp); | |
85 | } | |
86 | ||
87 | ||
88 | ssize_t qio_channel_readv(QIOChannel *ioc, | |
89 | const struct iovec *iov, | |
90 | size_t niov, | |
91 | Error **errp) | |
92 | { | |
93 | return qio_channel_readv_full(ioc, iov, niov, NULL, NULL, errp); | |
94 | } | |
95 | ||
96 | ||
97 | ssize_t qio_channel_writev(QIOChannel *ioc, | |
98 | const struct iovec *iov, | |
99 | size_t niov, | |
100 | Error **errp) | |
101 | { | |
102 | return qio_channel_writev_full(ioc, iov, niov, NULL, 0, errp); | |
103 | } | |
104 | ||
105 | ||
106 | ssize_t qio_channel_read(QIOChannel *ioc, | |
107 | char *buf, | |
108 | size_t buflen, | |
109 | Error **errp) | |
110 | { | |
111 | struct iovec iov = { .iov_base = buf, .iov_len = buflen }; | |
112 | return qio_channel_readv_full(ioc, &iov, 1, NULL, NULL, errp); | |
113 | } | |
114 | ||
115 | ||
116 | ssize_t qio_channel_write(QIOChannel *ioc, | |
117 | const char *buf, | |
118 | size_t buflen, | |
119 | Error **errp) | |
120 | { | |
121 | struct iovec iov = { .iov_base = (char *)buf, .iov_len = buflen }; | |
122 | return qio_channel_writev_full(ioc, &iov, 1, NULL, 0, errp); | |
123 | } | |
124 | ||
125 | ||
126 | int qio_channel_set_blocking(QIOChannel *ioc, | |
127 | bool enabled, | |
128 | Error **errp) | |
129 | { | |
130 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
131 | return klass->io_set_blocking(ioc, enabled, errp); | |
132 | } | |
133 | ||
134 | ||
135 | int qio_channel_close(QIOChannel *ioc, | |
136 | Error **errp) | |
137 | { | |
138 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
139 | return klass->io_close(ioc, errp); | |
140 | } | |
141 | ||
142 | ||
143 | GSource *qio_channel_create_watch(QIOChannel *ioc, | |
144 | GIOCondition condition) | |
145 | { | |
146 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
20f4aa26 DB |
147 | GSource *ret = klass->io_create_watch(ioc, condition); |
148 | ||
149 | if (ioc->name) { | |
150 | g_source_set_name(ret, ioc->name); | |
151 | } | |
152 | ||
153 | return ret; | |
666a3af9 DB |
154 | } |
155 | ||
156 | ||
157 | guint qio_channel_add_watch(QIOChannel *ioc, | |
158 | GIOCondition condition, | |
159 | QIOChannelFunc func, | |
160 | gpointer user_data, | |
161 | GDestroyNotify notify) | |
162 | { | |
163 | GSource *source; | |
164 | guint id; | |
165 | ||
166 | source = qio_channel_create_watch(ioc, condition); | |
167 | ||
168 | g_source_set_callback(source, (GSourceFunc)func, user_data, notify); | |
169 | ||
170 | id = g_source_attach(source, NULL); | |
171 | g_source_unref(source); | |
172 | ||
173 | return id; | |
174 | } | |
175 | ||
176 | ||
177 | int qio_channel_shutdown(QIOChannel *ioc, | |
178 | QIOChannelShutdown how, | |
179 | Error **errp) | |
180 | { | |
181 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
182 | ||
183 | if (!klass->io_shutdown) { | |
184 | error_setg(errp, "Data path shutdown not supported"); | |
185 | return -1; | |
186 | } | |
187 | ||
188 | return klass->io_shutdown(ioc, how, errp); | |
189 | } | |
190 | ||
191 | ||
192 | void qio_channel_set_delay(QIOChannel *ioc, | |
193 | bool enabled) | |
194 | { | |
195 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
196 | ||
197 | if (klass->io_set_delay) { | |
198 | klass->io_set_delay(ioc, enabled); | |
199 | } | |
200 | } | |
201 | ||
202 | ||
203 | void qio_channel_set_cork(QIOChannel *ioc, | |
204 | bool enabled) | |
205 | { | |
206 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
207 | ||
208 | if (klass->io_set_cork) { | |
209 | klass->io_set_cork(ioc, enabled); | |
210 | } | |
211 | } | |
212 | ||
213 | ||
214 | off_t qio_channel_io_seek(QIOChannel *ioc, | |
215 | off_t offset, | |
216 | int whence, | |
217 | Error **errp) | |
218 | { | |
219 | QIOChannelClass *klass = QIO_CHANNEL_GET_CLASS(ioc); | |
220 | ||
221 | if (!klass->io_seek) { | |
222 | error_setg(errp, "Channel does not support random access"); | |
223 | return -1; | |
224 | } | |
225 | ||
226 | return klass->io_seek(ioc, offset, whence, errp); | |
227 | } | |
228 | ||
229 | ||
230 | typedef struct QIOChannelYieldData QIOChannelYieldData; | |
231 | struct QIOChannelYieldData { | |
232 | QIOChannel *ioc; | |
233 | Coroutine *co; | |
234 | }; | |
235 | ||
236 | ||
237 | static gboolean qio_channel_yield_enter(QIOChannel *ioc, | |
238 | GIOCondition condition, | |
239 | gpointer opaque) | |
240 | { | |
241 | QIOChannelYieldData *data = opaque; | |
0b8b8753 | 242 | qemu_coroutine_enter(data->co); |
666a3af9 DB |
243 | return FALSE; |
244 | } | |
245 | ||
246 | ||
247 | void coroutine_fn qio_channel_yield(QIOChannel *ioc, | |
248 | GIOCondition condition) | |
249 | { | |
250 | QIOChannelYieldData data; | |
251 | ||
252 | assert(qemu_in_coroutine()); | |
253 | data.ioc = ioc; | |
254 | data.co = qemu_coroutine_self(); | |
255 | qio_channel_add_watch(ioc, | |
256 | condition, | |
257 | qio_channel_yield_enter, | |
258 | &data, | |
259 | NULL); | |
260 | qemu_coroutine_yield(); | |
261 | } | |
262 | ||
263 | ||
264 | static gboolean qio_channel_wait_complete(QIOChannel *ioc, | |
265 | GIOCondition condition, | |
266 | gpointer opaque) | |
267 | { | |
268 | GMainLoop *loop = opaque; | |
269 | ||
270 | g_main_loop_quit(loop); | |
271 | return FALSE; | |
272 | } | |
273 | ||
274 | ||
275 | void qio_channel_wait(QIOChannel *ioc, | |
276 | GIOCondition condition) | |
277 | { | |
278 | GMainContext *ctxt = g_main_context_new(); | |
279 | GMainLoop *loop = g_main_loop_new(ctxt, TRUE); | |
280 | GSource *source; | |
281 | ||
282 | source = qio_channel_create_watch(ioc, condition); | |
283 | ||
284 | g_source_set_callback(source, | |
285 | (GSourceFunc)qio_channel_wait_complete, | |
286 | loop, | |
287 | NULL); | |
288 | ||
289 | g_source_attach(source, ctxt); | |
290 | ||
291 | g_main_loop_run(loop); | |
292 | ||
293 | g_source_unref(source); | |
294 | g_main_loop_unref(loop); | |
295 | g_main_context_unref(ctxt); | |
296 | } | |
297 | ||
298 | ||
a5897205 PB |
299 | static void qio_channel_finalize(Object *obj) |
300 | { | |
301 | QIOChannel *ioc = QIO_CHANNEL(obj); | |
302 | ||
20f4aa26 DB |
303 | g_free(ioc->name); |
304 | ||
305 | #ifdef _WIN32 | |
a5897205 PB |
306 | if (ioc->event) { |
307 | CloseHandle(ioc->event); | |
308 | } | |
a5897205 | 309 | #endif |
20f4aa26 | 310 | } |
a5897205 | 311 | |
666a3af9 DB |
312 | static const TypeInfo qio_channel_info = { |
313 | .parent = TYPE_OBJECT, | |
314 | .name = TYPE_QIO_CHANNEL, | |
315 | .instance_size = sizeof(QIOChannel), | |
a5897205 | 316 | .instance_finalize = qio_channel_finalize, |
666a3af9 DB |
317 | .abstract = true, |
318 | .class_size = sizeof(QIOChannelClass), | |
319 | }; | |
320 | ||
321 | ||
322 | static void qio_channel_register_types(void) | |
323 | { | |
324 | type_register_static(&qio_channel_info); | |
325 | } | |
326 | ||
327 | ||
328 | type_init(qio_channel_register_types); |