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d98e4eb7 DB |
1 | /* |
2 | * QEMU I/O channels memory buffer driver | |
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 | |
c8198bd5 | 9 | * version 2.1 of the License, or (at your option) any later version. |
d98e4eb7 DB |
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" |
d98e4eb7 DB |
22 | #include "io/channel-buffer.h" |
23 | #include "io/channel-watch.h" | |
0b8fa32f | 24 | #include "qemu/module.h" |
d98e4eb7 DB |
25 | #include "qemu/sockets.h" |
26 | #include "trace.h" | |
27 | ||
28 | QIOChannelBuffer * | |
29 | qio_channel_buffer_new(size_t capacity) | |
30 | { | |
31 | QIOChannelBuffer *ioc; | |
32 | ||
33 | ioc = QIO_CHANNEL_BUFFER(object_new(TYPE_QIO_CHANNEL_BUFFER)); | |
34 | ||
35 | if (capacity) { | |
e8f117f3 | 36 | ioc->data = g_new0(uint8_t, capacity); |
d98e4eb7 DB |
37 | ioc->capacity = capacity; |
38 | } | |
39 | ||
40 | return ioc; | |
41 | } | |
42 | ||
43 | ||
44 | static void qio_channel_buffer_finalize(Object *obj) | |
45 | { | |
46 | QIOChannelBuffer *ioc = QIO_CHANNEL_BUFFER(obj); | |
47 | g_free(ioc->data); | |
48 | ioc->capacity = ioc->usage = ioc->offset = 0; | |
49 | } | |
50 | ||
51 | ||
52 | static ssize_t qio_channel_buffer_readv(QIOChannel *ioc, | |
53 | const struct iovec *iov, | |
54 | size_t niov, | |
55 | int **fds, | |
56 | size_t *nfds, | |
84615a19 | 57 | int flags, |
d98e4eb7 DB |
58 | Error **errp) |
59 | { | |
60 | QIOChannelBuffer *bioc = QIO_CHANNEL_BUFFER(ioc); | |
61 | ssize_t ret = 0; | |
62 | size_t i; | |
63 | ||
64 | for (i = 0; i < niov; i++) { | |
65 | size_t want = iov[i].iov_len; | |
66 | if (bioc->offset >= bioc->usage) { | |
67 | break; | |
68 | } | |
69 | if ((bioc->offset + want) > bioc->usage) { | |
70 | want = bioc->usage - bioc->offset; | |
71 | } | |
72 | memcpy(iov[i].iov_base, bioc->data + bioc->offset, want); | |
73 | ret += want; | |
74 | bioc->offset += want; | |
75 | } | |
76 | ||
77 | return ret; | |
78 | } | |
79 | ||
80 | static ssize_t qio_channel_buffer_writev(QIOChannel *ioc, | |
81 | const struct iovec *iov, | |
82 | size_t niov, | |
83 | int *fds, | |
84 | size_t nfds, | |
b88651cb | 85 | int flags, |
d98e4eb7 DB |
86 | Error **errp) |
87 | { | |
88 | QIOChannelBuffer *bioc = QIO_CHANNEL_BUFFER(ioc); | |
89 | ssize_t ret = 0; | |
90 | size_t i; | |
91 | size_t towrite = 0; | |
92 | ||
93 | for (i = 0; i < niov; i++) { | |
94 | towrite += iov[i].iov_len; | |
95 | } | |
96 | ||
97 | if ((bioc->offset + towrite) > bioc->capacity) { | |
98 | bioc->capacity = bioc->offset + towrite; | |
99 | bioc->data = g_realloc(bioc->data, bioc->capacity); | |
100 | } | |
101 | ||
102 | if (bioc->offset > bioc->usage) { | |
103 | memset(bioc->data, 0, bioc->offset - bioc->usage); | |
104 | bioc->usage = bioc->offset; | |
105 | } | |
106 | ||
107 | for (i = 0; i < niov; i++) { | |
108 | memcpy(bioc->data + bioc->usage, | |
109 | iov[i].iov_base, | |
110 | iov[i].iov_len); | |
111 | bioc->usage += iov[i].iov_len; | |
112 | bioc->offset += iov[i].iov_len; | |
113 | ret += iov[i].iov_len; | |
114 | } | |
115 | ||
116 | return ret; | |
117 | } | |
118 | ||
119 | static int qio_channel_buffer_set_blocking(QIOChannel *ioc G_GNUC_UNUSED, | |
120 | bool enabled G_GNUC_UNUSED, | |
121 | Error **errp G_GNUC_UNUSED) | |
122 | { | |
123 | return 0; | |
124 | } | |
125 | ||
126 | ||
127 | static off_t qio_channel_buffer_seek(QIOChannel *ioc, | |
128 | off_t offset, | |
129 | int whence, | |
130 | Error **errp) | |
131 | { | |
132 | QIOChannelBuffer *bioc = QIO_CHANNEL_BUFFER(ioc); | |
133 | ||
134 | bioc->offset = offset; | |
135 | ||
136 | return offset; | |
137 | } | |
138 | ||
139 | ||
140 | static int qio_channel_buffer_close(QIOChannel *ioc, | |
141 | Error **errp) | |
142 | { | |
143 | QIOChannelBuffer *bioc = QIO_CHANNEL_BUFFER(ioc); | |
144 | ||
145 | g_free(bioc->data); | |
d656ec5e | 146 | bioc->data = NULL; |
d98e4eb7 DB |
147 | bioc->capacity = bioc->usage = bioc->offset = 0; |
148 | ||
149 | return 0; | |
150 | } | |
151 | ||
152 | ||
153 | typedef struct QIOChannelBufferSource QIOChannelBufferSource; | |
154 | struct QIOChannelBufferSource { | |
155 | GSource parent; | |
156 | QIOChannelBuffer *bioc; | |
157 | GIOCondition condition; | |
158 | }; | |
159 | ||
160 | static gboolean | |
161 | qio_channel_buffer_source_prepare(GSource *source, | |
162 | gint *timeout) | |
163 | { | |
164 | QIOChannelBufferSource *bsource = (QIOChannelBufferSource *)source; | |
165 | ||
166 | *timeout = -1; | |
167 | ||
168 | return (G_IO_IN | G_IO_OUT) & bsource->condition; | |
169 | } | |
170 | ||
171 | static gboolean | |
172 | qio_channel_buffer_source_check(GSource *source) | |
173 | { | |
174 | QIOChannelBufferSource *bsource = (QIOChannelBufferSource *)source; | |
175 | ||
176 | return (G_IO_IN | G_IO_OUT) & bsource->condition; | |
177 | } | |
178 | ||
179 | static gboolean | |
180 | qio_channel_buffer_source_dispatch(GSource *source, | |
181 | GSourceFunc callback, | |
182 | gpointer user_data) | |
183 | { | |
184 | QIOChannelFunc func = (QIOChannelFunc)callback; | |
185 | QIOChannelBufferSource *bsource = (QIOChannelBufferSource *)source; | |
186 | ||
187 | return (*func)(QIO_CHANNEL(bsource->bioc), | |
188 | ((G_IO_IN | G_IO_OUT) & bsource->condition), | |
189 | user_data); | |
190 | } | |
191 | ||
192 | static void | |
193 | qio_channel_buffer_source_finalize(GSource *source) | |
194 | { | |
195 | QIOChannelBufferSource *ssource = (QIOChannelBufferSource *)source; | |
196 | ||
197 | object_unref(OBJECT(ssource->bioc)); | |
198 | } | |
199 | ||
200 | GSourceFuncs qio_channel_buffer_source_funcs = { | |
201 | qio_channel_buffer_source_prepare, | |
202 | qio_channel_buffer_source_check, | |
203 | qio_channel_buffer_source_dispatch, | |
204 | qio_channel_buffer_source_finalize | |
205 | }; | |
206 | ||
207 | static GSource *qio_channel_buffer_create_watch(QIOChannel *ioc, | |
208 | GIOCondition condition) | |
209 | { | |
210 | QIOChannelBuffer *bioc = QIO_CHANNEL_BUFFER(ioc); | |
211 | QIOChannelBufferSource *ssource; | |
212 | GSource *source; | |
213 | ||
214 | source = g_source_new(&qio_channel_buffer_source_funcs, | |
215 | sizeof(QIOChannelBufferSource)); | |
216 | ssource = (QIOChannelBufferSource *)source; | |
217 | ||
218 | ssource->bioc = bioc; | |
219 | object_ref(OBJECT(bioc)); | |
220 | ||
221 | ssource->condition = condition; | |
222 | ||
223 | return source; | |
224 | } | |
225 | ||
226 | ||
227 | static void qio_channel_buffer_class_init(ObjectClass *klass, | |
228 | void *class_data G_GNUC_UNUSED) | |
229 | { | |
230 | QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass); | |
231 | ||
232 | ioc_klass->io_writev = qio_channel_buffer_writev; | |
233 | ioc_klass->io_readv = qio_channel_buffer_readv; | |
234 | ioc_klass->io_set_blocking = qio_channel_buffer_set_blocking; | |
235 | ioc_klass->io_seek = qio_channel_buffer_seek; | |
236 | ioc_klass->io_close = qio_channel_buffer_close; | |
237 | ioc_klass->io_create_watch = qio_channel_buffer_create_watch; | |
238 | } | |
239 | ||
240 | static const TypeInfo qio_channel_buffer_info = { | |
241 | .parent = TYPE_QIO_CHANNEL, | |
242 | .name = TYPE_QIO_CHANNEL_BUFFER, | |
243 | .instance_size = sizeof(QIOChannelBuffer), | |
244 | .instance_finalize = qio_channel_buffer_finalize, | |
245 | .class_init = qio_channel_buffer_class_init, | |
246 | }; | |
247 | ||
248 | static void qio_channel_buffer_register_types(void) | |
249 | { | |
250 | type_register_static(&qio_channel_buffer_info); | |
251 | } | |
252 | ||
253 | type_init(qio_channel_buffer_register_types); |