2 * QEMU I/O channels memory buffer driver
4 * Copyright (c) 2015 Red Hat, Inc.
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 2.1 of the License, or (at your option) any later version.
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.
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/>.
21 #include "qemu/osdep.h"
22 #include "io/channel-buffer.h"
23 #include "io/channel-watch.h"
24 #include "qemu/module.h"
25 #include "qemu/sockets.h"
29 qio_channel_buffer_new(size_t capacity)
31 QIOChannelBuffer *ioc;
33 ioc = QIO_CHANNEL_BUFFER(object_new(TYPE_QIO_CHANNEL_BUFFER));
36 ioc->data = g_new0(uint8_t, capacity);
37 ioc->capacity = capacity;
44 static void qio_channel_buffer_finalize(Object *obj)
46 QIOChannelBuffer *ioc = QIO_CHANNEL_BUFFER(obj);
48 ioc->capacity = ioc->usage = ioc->offset = 0;
52 static ssize_t qio_channel_buffer_readv(QIOChannel *ioc,
53 const struct iovec *iov,
60 QIOChannelBuffer *bioc = QIO_CHANNEL_BUFFER(ioc);
64 for (i = 0; i < niov; i++) {
65 size_t want = iov[i].iov_len;
66 if (bioc->offset >= bioc->usage) {
69 if ((bioc->offset + want) > bioc->usage) {
70 want = bioc->usage - bioc->offset;
72 memcpy(iov[i].iov_base, bioc->data + bioc->offset, want);
80 static ssize_t qio_channel_buffer_writev(QIOChannel *ioc,
81 const struct iovec *iov,
88 QIOChannelBuffer *bioc = QIO_CHANNEL_BUFFER(ioc);
93 for (i = 0; i < niov; i++) {
94 towrite += iov[i].iov_len;
97 if ((bioc->offset + towrite) > bioc->capacity) {
98 bioc->capacity = bioc->offset + towrite;
99 bioc->data = g_realloc(bioc->data, bioc->capacity);
102 if (bioc->offset > bioc->usage) {
103 memset(bioc->data, 0, bioc->offset - bioc->usage);
104 bioc->usage = bioc->offset;
107 for (i = 0; i < niov; i++) {
108 memcpy(bioc->data + bioc->usage,
111 bioc->usage += iov[i].iov_len;
112 bioc->offset += iov[i].iov_len;
113 ret += iov[i].iov_len;
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)
127 static off_t qio_channel_buffer_seek(QIOChannel *ioc,
132 QIOChannelBuffer *bioc = QIO_CHANNEL_BUFFER(ioc);
134 bioc->offset = offset;
140 static int qio_channel_buffer_close(QIOChannel *ioc,
143 QIOChannelBuffer *bioc = QIO_CHANNEL_BUFFER(ioc);
147 bioc->capacity = bioc->usage = bioc->offset = 0;
153 typedef struct QIOChannelBufferSource QIOChannelBufferSource;
154 struct QIOChannelBufferSource {
156 QIOChannelBuffer *bioc;
157 GIOCondition condition;
161 qio_channel_buffer_source_prepare(GSource *source,
164 QIOChannelBufferSource *bsource = (QIOChannelBufferSource *)source;
168 return (G_IO_IN | G_IO_OUT) & bsource->condition;
172 qio_channel_buffer_source_check(GSource *source)
174 QIOChannelBufferSource *bsource = (QIOChannelBufferSource *)source;
176 return (G_IO_IN | G_IO_OUT) & bsource->condition;
180 qio_channel_buffer_source_dispatch(GSource *source,
181 GSourceFunc callback,
184 QIOChannelFunc func = (QIOChannelFunc)callback;
185 QIOChannelBufferSource *bsource = (QIOChannelBufferSource *)source;
187 return (*func)(QIO_CHANNEL(bsource->bioc),
188 ((G_IO_IN | G_IO_OUT) & bsource->condition),
193 qio_channel_buffer_source_finalize(GSource *source)
195 QIOChannelBufferSource *ssource = (QIOChannelBufferSource *)source;
197 object_unref(OBJECT(ssource->bioc));
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
207 static GSource *qio_channel_buffer_create_watch(QIOChannel *ioc,
208 GIOCondition condition)
210 QIOChannelBuffer *bioc = QIO_CHANNEL_BUFFER(ioc);
211 QIOChannelBufferSource *ssource;
214 source = g_source_new(&qio_channel_buffer_source_funcs,
215 sizeof(QIOChannelBufferSource));
216 ssource = (QIOChannelBufferSource *)source;
218 ssource->bioc = bioc;
219 object_ref(OBJECT(bioc));
221 ssource->condition = condition;
227 static void qio_channel_buffer_class_init(ObjectClass *klass,
228 void *class_data G_GNUC_UNUSED)
230 QIOChannelClass *ioc_klass = QIO_CHANNEL_CLASS(klass);
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;
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,
248 static void qio_channel_buffer_register_types(void)
250 type_register_static(&qio_channel_buffer_info);
253 type_init(qio_channel_buffer_register_types);