| 1 | /* |
| 2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * as published by the Free Software Foundation; only version 2 |
| 8 | * of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | */ |
| 19 | |
| 20 | #include <string.h> |
| 21 | #include <ust/lttng-ust-ctl.h> |
| 22 | #include <ust/lttng-ust-abi.h> |
| 23 | #include <ust/usterr-signal-safe.h> |
| 24 | #include "lttng-ust-comm.h" |
| 25 | |
| 26 | #include "../libringbuffer/backend.h" |
| 27 | #include "../libringbuffer/frontend.h" |
| 28 | |
| 29 | static |
| 30 | void init_object(struct object_data *data) |
| 31 | { |
| 32 | data->handle = -1; |
| 33 | data->shm_fd = -1; |
| 34 | data->wait_fd = -1; |
| 35 | data->memory_map_size = 0; |
| 36 | } |
| 37 | |
| 38 | void release_object(int sock, struct object_data *data) |
| 39 | { |
| 40 | struct ustcomm_ust_msg lum; |
| 41 | struct ustcomm_ust_reply lur; |
| 42 | int ret; |
| 43 | |
| 44 | if (data->shm_fd >= 0) |
| 45 | close(data->shm_fd); |
| 46 | if (data->wait_fd >= 0) |
| 47 | close(data->wait_fd); |
| 48 | memset(&lum, 0, sizeof(lum)); |
| 49 | lum.handle = data->handle; |
| 50 | lum.cmd = LTTNG_UST_RELEASE; |
| 51 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
| 52 | assert(!ret); |
| 53 | free(data); |
| 54 | } |
| 55 | |
| 56 | /* |
| 57 | * returns session handle. |
| 58 | */ |
| 59 | int ustctl_create_session(int sock) |
| 60 | { |
| 61 | struct ustcomm_ust_msg lum; |
| 62 | struct ustcomm_ust_reply lur; |
| 63 | int ret, session_handle; |
| 64 | |
| 65 | /* Create session */ |
| 66 | memset(&lum, 0, sizeof(lum)); |
| 67 | lum.handle = LTTNG_UST_ROOT_HANDLE; |
| 68 | lum.cmd = LTTNG_UST_SESSION; |
| 69 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
| 70 | if (ret) |
| 71 | return ret; |
| 72 | session_handle = lur.ret_val; |
| 73 | DBG("received session handle %u", session_handle); |
| 74 | return session_handle; |
| 75 | } |
| 76 | |
| 77 | /* open the metadata global channel */ |
| 78 | int ustctl_open_metadata(int sock, int session_handle, |
| 79 | struct lttng_ust_channel_attr *chops, |
| 80 | struct object_data **_metadata_data) |
| 81 | { |
| 82 | struct ustcomm_ust_msg lum; |
| 83 | struct ustcomm_ust_reply lur; |
| 84 | struct object_data *metadata_data; |
| 85 | int ret; |
| 86 | |
| 87 | metadata_data = malloc(sizeof(*metadata_data)); |
| 88 | if (!metadata_data) |
| 89 | return -ENOMEM; |
| 90 | init_object(metadata_data); |
| 91 | /* Create metadata channel */ |
| 92 | memset(&lum, 0, sizeof(lum)); |
| 93 | lum.handle = session_handle; |
| 94 | lum.cmd = LTTNG_UST_METADATA; |
| 95 | lum.u.channel.overwrite = chops->overwrite; |
| 96 | lum.u.channel.subbuf_size = chops->subbuf_size; |
| 97 | lum.u.channel.num_subbuf = chops->num_subbuf; |
| 98 | lum.u.channel.switch_timer_interval = chops->switch_timer_interval; |
| 99 | lum.u.channel.read_timer_interval = chops->read_timer_interval; |
| 100 | lum.u.channel.output = chops->output; |
| 101 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
| 102 | if (ret) { |
| 103 | free(metadata_data); |
| 104 | return ret; |
| 105 | } |
| 106 | if (lur.ret_code != USTCOMM_OK) { |
| 107 | free(metadata_data); |
| 108 | return lur.ret_code; |
| 109 | } |
| 110 | metadata_data->handle = lur.ret_val; |
| 111 | DBG("received metadata handle %u", metadata_data->handle); |
| 112 | metadata_data->memory_map_size = lur.u.channel.memory_map_size; |
| 113 | /* get shm fd */ |
| 114 | ret = ustcomm_recv_fd(sock); |
| 115 | if (ret < 0) |
| 116 | goto error; |
| 117 | metadata_data->shm_fd = ret; |
| 118 | /* get wait fd */ |
| 119 | ret = ustcomm_recv_fd(sock); |
| 120 | if (ret < 0) |
| 121 | goto error; |
| 122 | metadata_data->wait_fd = ret; |
| 123 | *_metadata_data = metadata_data; |
| 124 | return 0; |
| 125 | |
| 126 | error: |
| 127 | release_object(sock, metadata_data); |
| 128 | return -EINVAL; |
| 129 | } |
| 130 | |
| 131 | int ustctl_create_channel(int sock, int session_handle, |
| 132 | struct lttng_ust_channel_attr *chops, |
| 133 | struct object_data **_channel_data) |
| 134 | { |
| 135 | struct ustcomm_ust_msg lum; |
| 136 | struct ustcomm_ust_reply lur; |
| 137 | struct object_data *channel_data; |
| 138 | int ret; |
| 139 | |
| 140 | channel_data = malloc(sizeof(*channel_data)); |
| 141 | if (!channel_data) |
| 142 | return -ENOMEM; |
| 143 | init_object(channel_data); |
| 144 | /* Create metadata channel */ |
| 145 | memset(&lum, 0, sizeof(lum)); |
| 146 | lum.handle = session_handle; |
| 147 | lum.cmd = LTTNG_UST_CHANNEL; |
| 148 | lum.u.channel.overwrite = chops->overwrite; |
| 149 | lum.u.channel.subbuf_size = chops->subbuf_size; |
| 150 | lum.u.channel.num_subbuf = chops->num_subbuf; |
| 151 | lum.u.channel.switch_timer_interval = chops->switch_timer_interval; |
| 152 | lum.u.channel.read_timer_interval = chops->read_timer_interval; |
| 153 | lum.u.channel.output = chops->output; |
| 154 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
| 155 | if (ret) { |
| 156 | free(channel_data); |
| 157 | return ret; |
| 158 | } |
| 159 | if (lur.ret_code != USTCOMM_OK) { |
| 160 | free(channel_data); |
| 161 | return lur.ret_code; |
| 162 | } |
| 163 | channel_data->handle = lur.ret_val; |
| 164 | DBG("received channel handle %u", channel_data->handle); |
| 165 | channel_data->memory_map_size = lur.u.channel.memory_map_size; |
| 166 | /* get shm fd */ |
| 167 | ret = ustcomm_recv_fd(sock); |
| 168 | if (ret < 0) |
| 169 | goto error; |
| 170 | channel_data->shm_fd = ret; |
| 171 | /* get wait fd */ |
| 172 | ret = ustcomm_recv_fd(sock); |
| 173 | if (ret < 0) |
| 174 | goto error; |
| 175 | channel_data->wait_fd = ret; |
| 176 | *_channel_data = channel_data; |
| 177 | return 0; |
| 178 | |
| 179 | error: |
| 180 | release_object(sock, channel_data); |
| 181 | return -EINVAL; |
| 182 | } |
| 183 | |
| 184 | /* |
| 185 | * Return -ENOENT if no more stream is available for creation. |
| 186 | * Return 0 on success. |
| 187 | * Return negative error value on error. |
| 188 | */ |
| 189 | int ustctl_create_stream(int sock, struct object_data *channel_data, |
| 190 | struct object_data **_stream_data) |
| 191 | { |
| 192 | struct ustcomm_ust_msg lum; |
| 193 | struct ustcomm_ust_reply lur; |
| 194 | struct object_data *stream_data; |
| 195 | int ret, fd; |
| 196 | |
| 197 | stream_data = malloc(sizeof(*stream_data)); |
| 198 | if (!stream_data) |
| 199 | return -ENOMEM; |
| 200 | init_object(stream_data); |
| 201 | memset(&lum, 0, sizeof(lum)); |
| 202 | lum.handle = channel_data->handle; |
| 203 | lum.cmd = LTTNG_UST_STREAM; |
| 204 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
| 205 | if (ret) { |
| 206 | free(stream_data); |
| 207 | return ret; |
| 208 | } |
| 209 | if (lur.ret_code != USTCOMM_OK) { |
| 210 | free(stream_data); |
| 211 | return lur.ret_code; |
| 212 | } |
| 213 | |
| 214 | stream_data->handle = lur.ret_val; |
| 215 | DBG("received stream handle %u", stream_data->handle); |
| 216 | stream_data->memory_map_size = lur.u.stream.memory_map_size; |
| 217 | /* get shm fd */ |
| 218 | fd = ustcomm_recv_fd(sock); |
| 219 | if (fd < 0) |
| 220 | goto error; |
| 221 | stream_data->shm_fd = fd; |
| 222 | /* get wait fd */ |
| 223 | fd = ustcomm_recv_fd(sock); |
| 224 | if (fd < 0) |
| 225 | goto error; |
| 226 | stream_data->wait_fd = fd; |
| 227 | *_stream_data = stream_data; |
| 228 | return ret; |
| 229 | |
| 230 | error: |
| 231 | release_object(sock, stream_data); |
| 232 | return -EINVAL; |
| 233 | } |
| 234 | |
| 235 | int ustctl_create_event(int sock, struct lttng_ust_event *ev, |
| 236 | struct object_data *channel_data, |
| 237 | struct object_data **_event_data) |
| 238 | { |
| 239 | struct ustcomm_ust_msg lum; |
| 240 | struct ustcomm_ust_reply lur; |
| 241 | struct object_data *event_data; |
| 242 | int ret; |
| 243 | |
| 244 | event_data = malloc(sizeof(*event_data)); |
| 245 | if (!event_data) |
| 246 | return -ENOMEM; |
| 247 | init_object(event_data); |
| 248 | memset(&lum, 0, sizeof(lum)); |
| 249 | lum.handle = channel_data->handle; |
| 250 | lum.cmd = LTTNG_UST_EVENT; |
| 251 | strncpy(lum.u.event.name, ev->name, |
| 252 | LTTNG_UST_SYM_NAME_LEN); |
| 253 | lum.u.event.instrumentation = ev->instrumentation; |
| 254 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
| 255 | if (ret) { |
| 256 | free(event_data); |
| 257 | return ret; |
| 258 | } |
| 259 | event_data->handle = lur.ret_val; |
| 260 | DBG("received event handle %u", event_data->handle); |
| 261 | *_event_data = event_data; |
| 262 | return 0; |
| 263 | } |
| 264 | |
| 265 | int ustctl_add_context(int sock, struct lttng_ust_context *ctx, |
| 266 | struct object_data *channel_data, |
| 267 | struct object_data **_context_data) |
| 268 | { |
| 269 | struct ustcomm_ust_msg lum; |
| 270 | struct ustcomm_ust_reply lur; |
| 271 | struct object_data *context_data; |
| 272 | int ret; |
| 273 | |
| 274 | context_data = malloc(sizeof(*context_data)); |
| 275 | if (!context_data) |
| 276 | return -ENOMEM; |
| 277 | init_object(context_data); |
| 278 | memset(&lum, 0, sizeof(lum)); |
| 279 | lum.handle = channel_data->handle; |
| 280 | lum.cmd = LTTNG_UST_CONTEXT; |
| 281 | lum.u.context.ctx = ctx->ctx; |
| 282 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
| 283 | if (ret) { |
| 284 | free(context_data); |
| 285 | return ret; |
| 286 | } |
| 287 | context_data->handle = lur.ret_val; |
| 288 | DBG("received context handle %u", context_data->handle); |
| 289 | *_context_data = context_data; |
| 290 | return ret; |
| 291 | } |
| 292 | |
| 293 | /* Enable event, channel and session ioctl */ |
| 294 | int ustctl_enable(int sock, struct object_data *object) |
| 295 | { |
| 296 | struct ustcomm_ust_msg lum; |
| 297 | struct ustcomm_ust_reply lur; |
| 298 | int ret; |
| 299 | |
| 300 | memset(&lum, 0, sizeof(lum)); |
| 301 | lum.handle = object->handle; |
| 302 | lum.cmd = LTTNG_UST_ENABLE; |
| 303 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
| 304 | if (ret) |
| 305 | return ret; |
| 306 | DBG("enabled handle %u", object->handle); |
| 307 | return 0; |
| 308 | } |
| 309 | |
| 310 | /* Disable event, channel and session ioctl */ |
| 311 | int ustctl_disable(int sock, struct object_data *object) |
| 312 | { |
| 313 | struct ustcomm_ust_msg lum; |
| 314 | struct ustcomm_ust_reply lur; |
| 315 | int ret; |
| 316 | |
| 317 | memset(&lum, 0, sizeof(lum)); |
| 318 | lum.handle = object->handle; |
| 319 | lum.cmd = LTTNG_UST_DISABLE; |
| 320 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
| 321 | if (ret) |
| 322 | return ret; |
| 323 | DBG("disable handle %u", object->handle); |
| 324 | return 0; |
| 325 | } |
| 326 | |
| 327 | int ustctl_start_session(int sock, struct object_data *object) |
| 328 | { |
| 329 | return ustctl_enable(sock, object); |
| 330 | } |
| 331 | |
| 332 | int ustctl_stop_session(int sock, struct object_data *object) |
| 333 | { |
| 334 | return ustctl_disable(sock, object); |
| 335 | } |
| 336 | |
| 337 | |
| 338 | int ustctl_tracepoint_list(int sock) |
| 339 | { |
| 340 | return -ENOSYS; /* not implemented */ |
| 341 | } |
| 342 | |
| 343 | int ustctl_tracer_version(int sock, struct lttng_ust_tracer_version *v) |
| 344 | { |
| 345 | struct ustcomm_ust_msg lum; |
| 346 | struct ustcomm_ust_reply lur; |
| 347 | int ret; |
| 348 | |
| 349 | memset(&lum, 0, sizeof(lum)); |
| 350 | lum.handle = LTTNG_UST_ROOT_HANDLE; |
| 351 | lum.cmd = LTTNG_UST_TRACER_VERSION; |
| 352 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
| 353 | if (ret) |
| 354 | return ret; |
| 355 | memcpy(v, &lur.u.version, sizeof(*v)); |
| 356 | DBG("received tracer version"); |
| 357 | return 0; |
| 358 | } |
| 359 | |
| 360 | int ustctl_wait_quiescent(int sock) |
| 361 | { |
| 362 | struct ustcomm_ust_msg lum; |
| 363 | struct ustcomm_ust_reply lur; |
| 364 | int ret; |
| 365 | |
| 366 | memset(&lum, 0, sizeof(lum)); |
| 367 | lum.handle = LTTNG_UST_ROOT_HANDLE; |
| 368 | lum.cmd = LTTNG_UST_WAIT_QUIESCENT; |
| 369 | ret = ustcomm_send_app_cmd(sock, &lum, &lur); |
| 370 | if (ret) |
| 371 | return ret; |
| 372 | DBG("waited for quiescent state"); |
| 373 | return 0; |
| 374 | } |
| 375 | |
| 376 | int ustctl_calibrate(int sock, struct lttng_ust_calibrate *calibrate) |
| 377 | { |
| 378 | return -ENOSYS; |
| 379 | } |
| 380 | |
| 381 | /* Buffer operations */ |
| 382 | |
| 383 | /* Map channel shm into process memory */ |
| 384 | struct shm_handle *ustctl_map_channel(struct object_data *chan_data) |
| 385 | { |
| 386 | struct shm_handle *handle; |
| 387 | struct channel *chan; |
| 388 | size_t chan_size; |
| 389 | |
| 390 | handle = channel_handle_create(chan_data->shm_fd, |
| 391 | chan_data->wait_fd, |
| 392 | chan_data->memory_map_size); |
| 393 | if (!handle) { |
| 394 | ERR("create handle error"); |
| 395 | return NULL; |
| 396 | } |
| 397 | /* |
| 398 | * Set to -1 because the shm_handle destruction will take care |
| 399 | * of closing shm_fd and wait_fd. |
| 400 | */ |
| 401 | chan_data->shm_fd = -1; |
| 402 | chan_data->wait_fd = -1; |
| 403 | |
| 404 | /* |
| 405 | * TODO: add consistency checks to be resilient if the |
| 406 | * application try to feed us with incoherent channel structure |
| 407 | * values. |
| 408 | */ |
| 409 | chan = shmp(handle, handle->chan); |
| 410 | /* chan is object 0. This is hardcoded. */ |
| 411 | chan_size = handle->table->objects[0].allocated_len; |
| 412 | handle->shadow_chan = malloc(chan_size); |
| 413 | if (!handle->shadow_chan) { |
| 414 | channel_destroy(chan, handle, 1); |
| 415 | return NULL; |
| 416 | } |
| 417 | memcpy(handle->shadow_chan, chan, chan_size); |
| 418 | return handle; |
| 419 | } |
| 420 | |
| 421 | /* Add stream to channel shm and map its shm into process memory */ |
| 422 | int ustctl_add_stream(struct shm_handle *handle, |
| 423 | struct object_data *stream_data) |
| 424 | { |
| 425 | int ret; |
| 426 | |
| 427 | if (!stream_data->handle) |
| 428 | return -ENOENT; |
| 429 | /* map stream */ |
| 430 | ret = channel_handle_add_stream(handle, |
| 431 | stream_data->shm_fd, |
| 432 | stream_data->wait_fd, |
| 433 | stream_data->memory_map_size); |
| 434 | if (ret) { |
| 435 | ERR("add stream error\n"); |
| 436 | return ret; |
| 437 | } |
| 438 | /* |
| 439 | * Set to -1 because the shm_handle destruction will take care |
| 440 | * of closing shm_fd and wait_fd. |
| 441 | */ |
| 442 | stream_data->shm_fd = -1; |
| 443 | stream_data->wait_fd = -1; |
| 444 | return 0; |
| 445 | } |
| 446 | |
| 447 | void ustctl_unmap_channel(struct shm_handle *handle) |
| 448 | { |
| 449 | struct channel *chan; |
| 450 | |
| 451 | chan = shmp(handle, handle->chan); |
| 452 | channel_destroy(chan, handle, 1); |
| 453 | } |
| 454 | |
| 455 | /* For mmap mode, readable without "get" operation */ |
| 456 | |
| 457 | /* returns the length to mmap. */ |
| 458 | int ustctl_get_mmap_len(struct shm_handle *handle, |
| 459 | struct lib_ring_buffer *buf, |
| 460 | unsigned long *len) |
| 461 | { |
| 462 | unsigned long mmap_buf_len; |
| 463 | struct channel *chan = handle->shadow_chan; |
| 464 | |
| 465 | if (chan->backend.config.output != RING_BUFFER_MMAP) |
| 466 | return -EINVAL; |
| 467 | mmap_buf_len = chan->backend.buf_size; |
| 468 | if (chan->backend.extra_reader_sb) |
| 469 | mmap_buf_len += chan->backend.subbuf_size; |
| 470 | if (mmap_buf_len > INT_MAX) |
| 471 | return -EFBIG; |
| 472 | *len = mmap_buf_len; |
| 473 | return 0; |
| 474 | } |
| 475 | |
| 476 | /* returns the maximum size for sub-buffers. */ |
| 477 | int ustctl_get_max_subbuf_size(struct shm_handle *handle, |
| 478 | struct lib_ring_buffer *buf, |
| 479 | unsigned long *len) |
| 480 | { |
| 481 | struct channel *chan = handle->shadow_chan; |
| 482 | |
| 483 | *len = chan->backend.subbuf_size; |
| 484 | return 0; |
| 485 | } |
| 486 | |
| 487 | /* |
| 488 | * For mmap mode, operate on the current packet (between get/put or |
| 489 | * get_next/put_next). |
| 490 | */ |
| 491 | |
| 492 | /* returns the offset of the subbuffer belonging to the mmap reader. */ |
| 493 | int ustctl_get_mmap_read_offset(struct shm_handle *handle, |
| 494 | struct lib_ring_buffer *buf, unsigned long *off) |
| 495 | { |
| 496 | struct channel *chan = handle->shadow_chan; |
| 497 | unsigned long sb_bindex; |
| 498 | |
| 499 | if (chan->backend.config.output != RING_BUFFER_MMAP) |
| 500 | return -EINVAL; |
| 501 | sb_bindex = subbuffer_id_get_index(&chan->backend.config, |
| 502 | buf->backend.buf_rsb.id); |
| 503 | *off = shmp(handle, shmp_index(handle, buf->backend.array, sb_bindex)->shmp)->mmap_offset; |
| 504 | return 0; |
| 505 | } |
| 506 | |
| 507 | /* returns the size of the current sub-buffer, without padding (for mmap). */ |
| 508 | int ustctl_get_subbuf_size(struct shm_handle *handle, |
| 509 | struct lib_ring_buffer *buf, unsigned long *len) |
| 510 | { |
| 511 | struct channel *chan = handle->shadow_chan; |
| 512 | |
| 513 | *len = lib_ring_buffer_get_read_data_size(&chan->backend.config, buf, |
| 514 | handle); |
| 515 | return 0; |
| 516 | } |
| 517 | |
| 518 | /* returns the size of the current sub-buffer, without padding (for mmap). */ |
| 519 | int ustctl_get_padded_subbuf_size(struct shm_handle *handle, |
| 520 | struct lib_ring_buffer *buf, unsigned long *len) |
| 521 | { |
| 522 | struct channel *chan = handle->shadow_chan; |
| 523 | |
| 524 | *len = lib_ring_buffer_get_read_data_size(&chan->backend.config, buf, |
| 525 | handle); |
| 526 | *len = PAGE_ALIGN(*len); |
| 527 | return 0; |
| 528 | } |
| 529 | |
| 530 | /* Get exclusive read access to the next sub-buffer that can be read. */ |
| 531 | int ustctl_get_next_subbuf(struct shm_handle *handle, |
| 532 | struct lib_ring_buffer *buf) |
| 533 | { |
| 534 | return lib_ring_buffer_get_next_subbuf(buf, handle); |
| 535 | } |
| 536 | |
| 537 | |
| 538 | /* Release exclusive sub-buffer access, move consumer forward. */ |
| 539 | int ustctl_put_next_subbuf(struct shm_handle *handle, |
| 540 | struct lib_ring_buffer *buf) |
| 541 | { |
| 542 | lib_ring_buffer_put_next_subbuf(buf, handle); |
| 543 | return 0; |
| 544 | } |
| 545 | |
| 546 | /* snapshot */ |
| 547 | |
| 548 | /* Get a snapshot of the current ring buffer producer and consumer positions */ |
| 549 | int ustctl_snapshot(struct shm_handle *handle, |
| 550 | struct lib_ring_buffer *buf) |
| 551 | { |
| 552 | return lib_ring_buffer_snapshot(buf, &buf->cons_snapshot, |
| 553 | &buf->prod_snapshot, handle); |
| 554 | } |
| 555 | |
| 556 | /* Get the consumer position (iteration start) */ |
| 557 | int ustctl_snapshot_get_consumed(struct shm_handle *handle, |
| 558 | struct lib_ring_buffer *buf, unsigned long *pos) |
| 559 | { |
| 560 | *pos = buf->cons_snapshot; |
| 561 | return 0; |
| 562 | } |
| 563 | |
| 564 | /* Get the producer position (iteration end) */ |
| 565 | int ustctl_snapshot_get_produced(struct shm_handle *handle, |
| 566 | struct lib_ring_buffer *buf, unsigned long *pos) |
| 567 | { |
| 568 | *pos = buf->prod_snapshot; |
| 569 | return 0; |
| 570 | } |
| 571 | |
| 572 | /* Get exclusive read access to the specified sub-buffer position */ |
| 573 | int ustctl_get_subbuf(struct shm_handle *handle, |
| 574 | struct lib_ring_buffer *buf, unsigned long *pos) |
| 575 | { |
| 576 | return lib_ring_buffer_get_subbuf(buf, *pos, handle); |
| 577 | } |
| 578 | |
| 579 | /* Release exclusive sub-buffer access */ |
| 580 | int ustctl_put_subbuf(struct shm_handle *handle, |
| 581 | struct lib_ring_buffer *buf) |
| 582 | { |
| 583 | lib_ring_buffer_put_subbuf(buf, handle); |
| 584 | return 0; |
| 585 | } |
| 586 | |
| 587 | int ustctl_buffer_flush(struct shm_handle *handle, |
| 588 | struct lib_ring_buffer *buf) |
| 589 | { |
| 590 | lib_ring_buffer_switch_slow(buf, SWITCH_ACTIVE, handle); |
| 591 | return 0; |
| 592 | } |