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