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