Daniel P. Berrange | d98e4eb | 2015-09-15 17:27:33 +0100 | [diff] [blame] | 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 | |
Peter Maydell | cae9fc5 | 2016-01-29 17:50:03 +0000 | [diff] [blame] | 21 | #include "qemu/osdep.h" |
Daniel P. Berrange | d98e4eb | 2015-09-15 17:27:33 +0100 | [diff] [blame] | 22 | #include "io/channel-buffer.h" |
| 23 | #include "io/channel-watch.h" |
Markus Armbruster | 0b8fa32 | 2019-05-23 16:35:07 +0200 | [diff] [blame] | 24 | #include "qemu/module.h" |
Daniel P. Berrange | d98e4eb | 2015-09-15 17:27:33 +0100 | [diff] [blame] | 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) { |
Daniel P. Berrange | e8f117f | 2016-02-12 16:45:31 +0000 | [diff] [blame] | 36 | ioc->data = g_new0(uint8_t, capacity); |
Daniel P. Berrange | d98e4eb | 2015-09-15 17:27:33 +0100 | [diff] [blame] | 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); |
Daniel P. Berrange | d656ec5 | 2016-04-27 11:04:52 +0100 | [diff] [blame] | 144 | bioc->data = NULL; |
Daniel P. Berrange | d98e4eb | 2015-09-15 17:27:33 +0100 | [diff] [blame] | 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); |