| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _LGPL_SOURCE |
| 19 | #include <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <string.h> |
| 22 | #include <unistd.h> |
| 23 | |
| 24 | #include <lttng/event.h> |
| 25 | #include <lttng/lttng-error.h> |
| 26 | #include <lttng/userspace-probe.h> |
| 27 | #include <lttng/userspace-probe-internal.h> |
| 28 | |
| 29 | #include <common/common.h> |
| 30 | #include <common/defaults.h> |
| 31 | #include <common/trace-chunk.h> |
| 32 | #include <common/macros.h> |
| 33 | |
| 34 | #include "consumer.h" |
| 35 | #include "trace-kernel.h" |
| 36 | #include "lttng-sessiond.h" |
| 37 | #include "notification-thread-commands.h" |
| 38 | |
| 39 | /* |
| 40 | * Find the channel name for the given kernel session. |
| 41 | */ |
| 42 | struct ltt_kernel_channel *trace_kernel_get_channel_by_name( |
| 43 | const char *name, struct ltt_kernel_session *session) |
| 44 | { |
| 45 | struct ltt_kernel_channel *chan; |
| 46 | |
| 47 | assert(session); |
| 48 | assert(name); |
| 49 | |
| 50 | /* |
| 51 | * If we receive an empty string for channel name, it means the |
| 52 | * default channel name is requested. |
| 53 | */ |
| 54 | if (name[0] == '\0') |
| 55 | name = DEFAULT_CHANNEL_NAME; |
| 56 | |
| 57 | DBG("Trying to find channel %s", name); |
| 58 | |
| 59 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
| 60 | if (strcmp(name, chan->channel->name) == 0) { |
| 61 | DBG("Found channel by name %s", name); |
| 62 | return chan; |
| 63 | } |
| 64 | } |
| 65 | |
| 66 | return NULL; |
| 67 | } |
| 68 | |
| 69 | /* |
| 70 | * Find the event for the given channel. |
| 71 | */ |
| 72 | struct ltt_kernel_event *trace_kernel_find_event( |
| 73 | char *name, struct ltt_kernel_channel *channel, |
| 74 | enum lttng_event_type type, |
| 75 | struct lttng_filter_bytecode *filter) |
| 76 | { |
| 77 | struct ltt_kernel_event *ev; |
| 78 | int found = 0; |
| 79 | |
| 80 | assert(name); |
| 81 | assert(channel); |
| 82 | |
| 83 | cds_list_for_each_entry(ev, &channel->events_list.head, list) { |
| 84 | if (type != LTTNG_EVENT_ALL && ev->type != type) { |
| 85 | continue; |
| 86 | } |
| 87 | if (strcmp(name, ev->event->name)) { |
| 88 | continue; |
| 89 | } |
| 90 | if ((ev->filter && !filter) || (!ev->filter && filter)) { |
| 91 | continue; |
| 92 | } |
| 93 | if (ev->filter && filter) { |
| 94 | if (ev->filter->len != filter->len || |
| 95 | memcmp(ev->filter->data, filter->data, |
| 96 | filter->len) != 0) { |
| 97 | continue; |
| 98 | } |
| 99 | } |
| 100 | found = 1; |
| 101 | break; |
| 102 | } |
| 103 | if (found) { |
| 104 | DBG("Found event %s for channel %s", name, |
| 105 | channel->channel->name); |
| 106 | return ev; |
| 107 | } else { |
| 108 | return NULL; |
| 109 | } |
| 110 | } |
| 111 | |
| 112 | /* |
| 113 | * Find the event name for the given channel. |
| 114 | */ |
| 115 | struct ltt_kernel_event *trace_kernel_get_event_by_name( |
| 116 | char *name, struct ltt_kernel_channel *channel, |
| 117 | enum lttng_event_type type) |
| 118 | { |
| 119 | struct ltt_kernel_event *ev; |
| 120 | int found = 0; |
| 121 | |
| 122 | assert(name); |
| 123 | assert(channel); |
| 124 | |
| 125 | cds_list_for_each_entry(ev, &channel->events_list.head, list) { |
| 126 | if (type != LTTNG_EVENT_ALL && ev->type != type) { |
| 127 | continue; |
| 128 | } |
| 129 | if (strcmp(name, ev->event->name)) { |
| 130 | continue; |
| 131 | } |
| 132 | found = 1; |
| 133 | break; |
| 134 | } |
| 135 | if (found) { |
| 136 | DBG("Found event %s for channel %s", name, |
| 137 | channel->channel->name); |
| 138 | return ev; |
| 139 | } else { |
| 140 | return NULL; |
| 141 | } |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * Allocate and initialize a kernel session data structure. |
| 146 | * |
| 147 | * Return pointer to structure or NULL. |
| 148 | */ |
| 149 | struct ltt_kernel_session *trace_kernel_create_session(void) |
| 150 | { |
| 151 | struct ltt_kernel_session *lks = NULL; |
| 152 | |
| 153 | /* Allocate a new ltt kernel session */ |
| 154 | lks = zmalloc(sizeof(struct ltt_kernel_session)); |
| 155 | if (lks == NULL) { |
| 156 | PERROR("create kernel session zmalloc"); |
| 157 | goto alloc_error; |
| 158 | } |
| 159 | |
| 160 | /* Init data structure */ |
| 161 | lks->fd = -1; |
| 162 | lks->metadata_stream_fd = -1; |
| 163 | lks->channel_count = 0; |
| 164 | lks->stream_count_global = 0; |
| 165 | lks->metadata = NULL; |
| 166 | CDS_INIT_LIST_HEAD(&lks->channel_list.head); |
| 167 | |
| 168 | lks->consumer = consumer_create_output(CONSUMER_DST_LOCAL); |
| 169 | if (lks->consumer == NULL) { |
| 170 | goto error; |
| 171 | } |
| 172 | |
| 173 | return lks; |
| 174 | |
| 175 | error: |
| 176 | free(lks); |
| 177 | |
| 178 | alloc_error: |
| 179 | return NULL; |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Allocate and initialize a kernel channel data structure. |
| 184 | * |
| 185 | * Return pointer to structure or NULL. |
| 186 | */ |
| 187 | struct ltt_kernel_channel *trace_kernel_create_channel( |
| 188 | struct lttng_channel *chan) |
| 189 | { |
| 190 | struct ltt_kernel_channel *lkc; |
| 191 | struct lttng_channel_extended *extended = NULL; |
| 192 | |
| 193 | assert(chan); |
| 194 | |
| 195 | lkc = zmalloc(sizeof(struct ltt_kernel_channel)); |
| 196 | if (lkc == NULL) { |
| 197 | PERROR("ltt_kernel_channel zmalloc"); |
| 198 | goto error; |
| 199 | } |
| 200 | |
| 201 | lkc->channel = zmalloc(sizeof(struct lttng_channel)); |
| 202 | if (lkc->channel == NULL) { |
| 203 | PERROR("lttng_channel zmalloc"); |
| 204 | goto error; |
| 205 | } |
| 206 | |
| 207 | extended = zmalloc(sizeof(struct lttng_channel_extended)); |
| 208 | if (!extended) { |
| 209 | PERROR("lttng_channel_channel zmalloc"); |
| 210 | goto error; |
| 211 | } |
| 212 | memcpy(lkc->channel, chan, sizeof(struct lttng_channel)); |
| 213 | memcpy(extended, chan->attr.extended.ptr, sizeof(struct lttng_channel_extended)); |
| 214 | lkc->channel->attr.extended.ptr = extended; |
| 215 | extended = NULL; |
| 216 | |
| 217 | /* |
| 218 | * If we receive an empty string for channel name, it means the |
| 219 | * default channel name is requested. |
| 220 | */ |
| 221 | if (chan->name[0] == '\0') { |
| 222 | strncpy(lkc->channel->name, DEFAULT_CHANNEL_NAME, |
| 223 | sizeof(lkc->channel->name)); |
| 224 | } |
| 225 | lkc->channel->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
| 226 | |
| 227 | lkc->fd = -1; |
| 228 | lkc->stream_count = 0; |
| 229 | lkc->event_count = 0; |
| 230 | lkc->enabled = 1; |
| 231 | lkc->published_to_notification_thread = false; |
| 232 | /* Init linked list */ |
| 233 | CDS_INIT_LIST_HEAD(&lkc->events_list.head); |
| 234 | CDS_INIT_LIST_HEAD(&lkc->stream_list.head); |
| 235 | CDS_INIT_LIST_HEAD(&lkc->ctx_list); |
| 236 | |
| 237 | return lkc; |
| 238 | |
| 239 | error: |
| 240 | if (lkc) { |
| 241 | free(lkc->channel); |
| 242 | } |
| 243 | free(extended); |
| 244 | free(lkc); |
| 245 | return NULL; |
| 246 | } |
| 247 | |
| 248 | /* |
| 249 | * Allocate and init a kernel context object. |
| 250 | * |
| 251 | * Return the allocated object or NULL on error. |
| 252 | */ |
| 253 | struct ltt_kernel_context *trace_kernel_create_context( |
| 254 | struct lttng_kernel_context *ctx) |
| 255 | { |
| 256 | struct ltt_kernel_context *kctx; |
| 257 | |
| 258 | kctx = zmalloc(sizeof(*kctx)); |
| 259 | if (!kctx) { |
| 260 | PERROR("zmalloc kernel context"); |
| 261 | goto error; |
| 262 | } |
| 263 | |
| 264 | if (ctx) { |
| 265 | memcpy(&kctx->ctx, ctx, sizeof(kctx->ctx)); |
| 266 | } |
| 267 | error: |
| 268 | return kctx; |
| 269 | } |
| 270 | |
| 271 | /* |
| 272 | * Allocate and init a kernel context object from an existing kernel context |
| 273 | * object. |
| 274 | * |
| 275 | * Return the allocated object or NULL on error. |
| 276 | */ |
| 277 | struct ltt_kernel_context *trace_kernel_copy_context( |
| 278 | struct ltt_kernel_context *kctx) |
| 279 | { |
| 280 | struct ltt_kernel_context *kctx_copy; |
| 281 | |
| 282 | assert(kctx); |
| 283 | kctx_copy = zmalloc(sizeof(*kctx_copy)); |
| 284 | if (!kctx_copy) { |
| 285 | PERROR("zmalloc ltt_kernel_context"); |
| 286 | goto error; |
| 287 | } |
| 288 | |
| 289 | memcpy(kctx_copy, kctx, sizeof(*kctx_copy)); |
| 290 | memset(&kctx_copy->list, 0, sizeof(kctx_copy->list)); |
| 291 | |
| 292 | error: |
| 293 | return kctx_copy; |
| 294 | } |
| 295 | |
| 296 | /* |
| 297 | * Allocate and initialize a kernel event. Set name and event type. |
| 298 | * We own filter_expression, and filter. |
| 299 | * |
| 300 | * Return pointer to structure or NULL. |
| 301 | */ |
| 302 | enum lttng_error_code trace_kernel_create_event( |
| 303 | struct lttng_event *ev, char *filter_expression, |
| 304 | struct lttng_filter_bytecode *filter, |
| 305 | struct ltt_kernel_event **kernel_event) |
| 306 | { |
| 307 | enum lttng_error_code ret; |
| 308 | struct lttng_kernel_event *attr; |
| 309 | struct ltt_kernel_event *local_kernel_event; |
| 310 | struct lttng_userspace_probe_location *userspace_probe_location = NULL; |
| 311 | |
| 312 | assert(ev); |
| 313 | |
| 314 | local_kernel_event = zmalloc(sizeof(struct ltt_kernel_event)); |
| 315 | attr = zmalloc(sizeof(struct lttng_kernel_event)); |
| 316 | if (local_kernel_event == NULL || attr == NULL) { |
| 317 | PERROR("kernel event zmalloc"); |
| 318 | ret = LTTNG_ERR_NOMEM; |
| 319 | goto error; |
| 320 | } |
| 321 | |
| 322 | switch (ev->type) { |
| 323 | case LTTNG_EVENT_PROBE: |
| 324 | attr->instrumentation = LTTNG_KERNEL_KPROBE; |
| 325 | attr->u.kprobe.addr = ev->attr.probe.addr; |
| 326 | attr->u.kprobe.offset = ev->attr.probe.offset; |
| 327 | strncpy(attr->u.kprobe.symbol_name, |
| 328 | ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
| 329 | attr->u.kprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
| 330 | break; |
| 331 | case LTTNG_EVENT_USERSPACE_PROBE: |
| 332 | { |
| 333 | const struct lttng_userspace_probe_location* location = NULL; |
| 334 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
| 335 | |
| 336 | location = lttng_event_get_userspace_probe_location(ev); |
| 337 | if (!location) { |
| 338 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 339 | goto error; |
| 340 | } |
| 341 | |
| 342 | /* |
| 343 | * From this point on, the specific term 'uprobe' is used |
| 344 | * instead of the generic 'userspace probe' because it's the |
| 345 | * technology used at the moment for this instrumentation. |
| 346 | * LTTng currently implements userspace probes using uprobes. |
| 347 | * In the interactions with the kernel tracer, we use the |
| 348 | * uprobe term. |
| 349 | */ |
| 350 | attr->instrumentation = LTTNG_KERNEL_UPROBE; |
| 351 | |
| 352 | /* |
| 353 | * Only the elf lookup method is supported at the moment. |
| 354 | */ |
| 355 | lookup = lttng_userspace_probe_location_get_lookup_method( |
| 356 | location); |
| 357 | if (!lookup) { |
| 358 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 359 | goto error; |
| 360 | } |
| 361 | |
| 362 | /* |
| 363 | * From the kernel tracer's perspective, all userspace probe |
| 364 | * event types are all the same: a file and an offset. |
| 365 | */ |
| 366 | switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) { |
| 367 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: |
| 368 | /* Get the file descriptor on the target binary. */ |
| 369 | attr->u.uprobe.fd = |
| 370 | lttng_userspace_probe_location_function_get_binary_fd(location); |
| 371 | |
| 372 | /* |
| 373 | * Save a reference to the probe location used during |
| 374 | * the listing of events. Close its FD since it won't |
| 375 | * be needed for listing. |
| 376 | */ |
| 377 | userspace_probe_location = |
| 378 | lttng_userspace_probe_location_copy(location); |
| 379 | ret = lttng_userspace_probe_location_function_set_binary_fd( |
| 380 | userspace_probe_location, -1); |
| 381 | if (ret) { |
| 382 | goto error; |
| 383 | } |
| 384 | break; |
| 385 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: |
| 386 | /* Get the file descriptor on the target binary. */ |
| 387 | attr->u.uprobe.fd = |
| 388 | lttng_userspace_probe_location_tracepoint_get_binary_fd(location); |
| 389 | |
| 390 | /* |
| 391 | * Save a reference to the probe location used during the listing of |
| 392 | * events. Close its FD since it won't be needed for listing. |
| 393 | */ |
| 394 | userspace_probe_location = |
| 395 | lttng_userspace_probe_location_copy(location); |
| 396 | ret = lttng_userspace_probe_location_tracepoint_set_binary_fd( |
| 397 | userspace_probe_location, -1); |
| 398 | if (ret) { |
| 399 | goto error; |
| 400 | } |
| 401 | break; |
| 402 | default: |
| 403 | DBG("Unsupported lookup method type"); |
| 404 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 405 | goto error; |
| 406 | } |
| 407 | break; |
| 408 | } |
| 409 | case LTTNG_EVENT_FUNCTION: |
| 410 | attr->instrumentation = LTTNG_KERNEL_KRETPROBE; |
| 411 | attr->u.kretprobe.addr = ev->attr.probe.addr; |
| 412 | attr->u.kretprobe.offset = ev->attr.probe.offset; |
| 413 | strncpy(attr->u.kretprobe.symbol_name, |
| 414 | ev->attr.probe.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
| 415 | attr->u.kretprobe.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
| 416 | break; |
| 417 | case LTTNG_EVENT_FUNCTION_ENTRY: |
| 418 | attr->instrumentation = LTTNG_KERNEL_FUNCTION; |
| 419 | strncpy(attr->u.ftrace.symbol_name, |
| 420 | ev->attr.ftrace.symbol_name, LTTNG_KERNEL_SYM_NAME_LEN); |
| 421 | attr->u.ftrace.symbol_name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
| 422 | break; |
| 423 | case LTTNG_EVENT_TRACEPOINT: |
| 424 | attr->instrumentation = LTTNG_KERNEL_TRACEPOINT; |
| 425 | break; |
| 426 | case LTTNG_EVENT_SYSCALL: |
| 427 | attr->instrumentation = LTTNG_KERNEL_SYSCALL; |
| 428 | break; |
| 429 | case LTTNG_EVENT_ALL: |
| 430 | attr->instrumentation = LTTNG_KERNEL_ALL; |
| 431 | break; |
| 432 | default: |
| 433 | ERR("Unknown kernel instrumentation type (%d)", ev->type); |
| 434 | ret = LTTNG_ERR_INVALID; |
| 435 | goto error; |
| 436 | } |
| 437 | |
| 438 | /* Copy event name */ |
| 439 | strncpy(attr->name, ev->name, LTTNG_KERNEL_SYM_NAME_LEN); |
| 440 | attr->name[LTTNG_KERNEL_SYM_NAME_LEN - 1] = '\0'; |
| 441 | |
| 442 | /* Setting up a kernel event */ |
| 443 | local_kernel_event->fd = -1; |
| 444 | local_kernel_event->event = attr; |
| 445 | local_kernel_event->enabled = 1; |
| 446 | local_kernel_event->filter_expression = filter_expression; |
| 447 | local_kernel_event->filter = filter; |
| 448 | local_kernel_event->userspace_probe_location = userspace_probe_location; |
| 449 | |
| 450 | *kernel_event = local_kernel_event; |
| 451 | |
| 452 | return LTTNG_OK; |
| 453 | |
| 454 | error: |
| 455 | free(filter_expression); |
| 456 | free(filter); |
| 457 | free(local_kernel_event); |
| 458 | free(attr); |
| 459 | return ret; |
| 460 | } |
| 461 | |
| 462 | /* |
| 463 | * Allocate and initialize a kernel metadata. |
| 464 | * |
| 465 | * Return pointer to structure or NULL. |
| 466 | */ |
| 467 | struct ltt_kernel_metadata *trace_kernel_create_metadata(void) |
| 468 | { |
| 469 | int ret; |
| 470 | struct ltt_kernel_metadata *lkm; |
| 471 | struct lttng_channel *chan; |
| 472 | |
| 473 | lkm = zmalloc(sizeof(struct ltt_kernel_metadata)); |
| 474 | chan = zmalloc(sizeof(struct lttng_channel)); |
| 475 | if (lkm == NULL || chan == NULL) { |
| 476 | PERROR("kernel metadata zmalloc"); |
| 477 | goto error; |
| 478 | } |
| 479 | |
| 480 | ret = lttng_strncpy( |
| 481 | chan->name, DEFAULT_METADATA_NAME, sizeof(chan->name)); |
| 482 | if (ret) { |
| 483 | ERR("Failed to initialize metadata channel name to `%s`", |
| 484 | DEFAULT_METADATA_NAME); |
| 485 | goto error; |
| 486 | } |
| 487 | |
| 488 | /* Set default attributes */ |
| 489 | chan->attr.overwrite = DEFAULT_METADATA_OVERWRITE; |
| 490 | chan->attr.subbuf_size = default_get_metadata_subbuf_size(); |
| 491 | chan->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; |
| 492 | chan->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
| 493 | chan->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;; |
| 494 | |
| 495 | |
| 496 | /* |
| 497 | * The metadata channel of kernel sessions must use the "mmap" |
| 498 | * back-end since the consumer daemon accumulates complete |
| 499 | * metadata units before sending them to the relay daemon in |
| 500 | * live mode. The consumer daemon also needs to extract the contents |
| 501 | * of the metadata cache when computing a rotation position. |
| 502 | * |
| 503 | * In both cases, it is not possible to rely on the splice |
| 504 | * back-end as the consumer daemon may need to accumulate more |
| 505 | * content than can be backed by the ring buffer's underlying |
| 506 | * pages. |
| 507 | */ |
| 508 | chan->attr.output = LTTNG_EVENT_MMAP; |
| 509 | chan->attr.tracefile_size = 0; |
| 510 | chan->attr.tracefile_count = 0; |
| 511 | chan->attr.live_timer_interval = 0; |
| 512 | |
| 513 | /* Init metadata */ |
| 514 | lkm->fd = -1; |
| 515 | lkm->conf = chan; |
| 516 | |
| 517 | return lkm; |
| 518 | |
| 519 | error: |
| 520 | free(lkm); |
| 521 | free(chan); |
| 522 | return NULL; |
| 523 | } |
| 524 | |
| 525 | /* |
| 526 | * Allocate and initialize a kernel stream. The stream is set to ACTIVE_FD by |
| 527 | * default. |
| 528 | * |
| 529 | * Return pointer to structure or NULL. |
| 530 | */ |
| 531 | struct ltt_kernel_stream *trace_kernel_create_stream(const char *name, |
| 532 | unsigned int count) |
| 533 | { |
| 534 | int ret; |
| 535 | struct ltt_kernel_stream *lks; |
| 536 | |
| 537 | assert(name); |
| 538 | |
| 539 | lks = zmalloc(sizeof(struct ltt_kernel_stream)); |
| 540 | if (lks == NULL) { |
| 541 | PERROR("kernel stream zmalloc"); |
| 542 | goto error; |
| 543 | } |
| 544 | |
| 545 | /* Set name */ |
| 546 | ret = snprintf(lks->name, sizeof(lks->name), "%s_%u", name, count); |
| 547 | if (ret < 0) { |
| 548 | PERROR("snprintf stream name"); |
| 549 | goto error; |
| 550 | } |
| 551 | lks->name[sizeof(lks->name) - 1] = '\0'; |
| 552 | |
| 553 | /* Init stream */ |
| 554 | lks->fd = -1; |
| 555 | lks->state = 0; |
| 556 | lks->cpu = count; |
| 557 | |
| 558 | return lks; |
| 559 | |
| 560 | error: |
| 561 | return NULL; |
| 562 | } |
| 563 | |
| 564 | /* |
| 565 | * Cleanup kernel stream structure. |
| 566 | */ |
| 567 | void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream) |
| 568 | { |
| 569 | assert(stream); |
| 570 | |
| 571 | DBG("[trace] Closing stream fd %d", stream->fd); |
| 572 | /* Close kernel fd */ |
| 573 | if (stream->fd >= 0) { |
| 574 | int ret; |
| 575 | |
| 576 | ret = close(stream->fd); |
| 577 | if (ret) { |
| 578 | PERROR("close"); |
| 579 | } |
| 580 | } |
| 581 | /* Remove from stream list */ |
| 582 | cds_list_del(&stream->list); |
| 583 | |
| 584 | free(stream); |
| 585 | } |
| 586 | |
| 587 | /* |
| 588 | * Cleanup kernel event structure. |
| 589 | */ |
| 590 | void trace_kernel_destroy_event(struct ltt_kernel_event *event) |
| 591 | { |
| 592 | assert(event); |
| 593 | |
| 594 | if (event->fd >= 0) { |
| 595 | int ret; |
| 596 | |
| 597 | DBG("[trace] Closing event fd %d", event->fd); |
| 598 | /* Close kernel fd */ |
| 599 | ret = close(event->fd); |
| 600 | if (ret) { |
| 601 | PERROR("close"); |
| 602 | } |
| 603 | } else { |
| 604 | DBG("[trace] Tearing down event (no associated fd)"); |
| 605 | } |
| 606 | |
| 607 | /* Remove from event list */ |
| 608 | cds_list_del(&event->list); |
| 609 | |
| 610 | free(event->filter_expression); |
| 611 | free(event->filter); |
| 612 | |
| 613 | free(event->event); |
| 614 | free(event); |
| 615 | } |
| 616 | |
| 617 | /* |
| 618 | * Cleanup kernel context structure. |
| 619 | */ |
| 620 | void trace_kernel_destroy_context(struct ltt_kernel_context *ctx) |
| 621 | { |
| 622 | assert(ctx); |
| 623 | |
| 624 | if (ctx->in_list) { |
| 625 | cds_list_del(&ctx->list); |
| 626 | } |
| 627 | free(ctx); |
| 628 | } |
| 629 | |
| 630 | /* |
| 631 | * Cleanup kernel channel structure. |
| 632 | */ |
| 633 | void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel) |
| 634 | { |
| 635 | struct ltt_kernel_stream *stream, *stmp; |
| 636 | struct ltt_kernel_event *event, *etmp; |
| 637 | struct ltt_kernel_context *ctx, *ctmp; |
| 638 | int ret; |
| 639 | enum lttng_error_code status; |
| 640 | |
| 641 | assert(channel); |
| 642 | |
| 643 | DBG("[trace] Closing channel fd %d", channel->fd); |
| 644 | /* Close kernel fd */ |
| 645 | if (channel->fd >= 0) { |
| 646 | ret = close(channel->fd); |
| 647 | if (ret) { |
| 648 | PERROR("close"); |
| 649 | } |
| 650 | } |
| 651 | |
| 652 | /* For each stream in the channel list */ |
| 653 | cds_list_for_each_entry_safe(stream, stmp, &channel->stream_list.head, list) { |
| 654 | trace_kernel_destroy_stream(stream); |
| 655 | } |
| 656 | |
| 657 | /* For each event in the channel list */ |
| 658 | cds_list_for_each_entry_safe(event, etmp, &channel->events_list.head, list) { |
| 659 | trace_kernel_destroy_event(event); |
| 660 | } |
| 661 | |
| 662 | /* For each context in the channel list */ |
| 663 | cds_list_for_each_entry_safe(ctx, ctmp, &channel->ctx_list, list) { |
| 664 | trace_kernel_destroy_context(ctx); |
| 665 | } |
| 666 | |
| 667 | /* Remove from channel list */ |
| 668 | cds_list_del(&channel->list); |
| 669 | |
| 670 | if (notification_thread_handle |
| 671 | && channel->published_to_notification_thread) { |
| 672 | status = notification_thread_command_remove_channel( |
| 673 | notification_thread_handle, |
| 674 | channel->key, LTTNG_DOMAIN_KERNEL); |
| 675 | assert(status == LTTNG_OK); |
| 676 | } |
| 677 | free(channel->channel->attr.extended.ptr); |
| 678 | free(channel->channel); |
| 679 | free(channel); |
| 680 | } |
| 681 | |
| 682 | /* |
| 683 | * Cleanup kernel metadata structure. |
| 684 | */ |
| 685 | void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata) |
| 686 | { |
| 687 | assert(metadata); |
| 688 | |
| 689 | DBG("[trace] Closing metadata fd %d", metadata->fd); |
| 690 | /* Close kernel fd */ |
| 691 | if (metadata->fd >= 0) { |
| 692 | int ret; |
| 693 | |
| 694 | ret = close(metadata->fd); |
| 695 | if (ret) { |
| 696 | PERROR("close"); |
| 697 | } |
| 698 | } |
| 699 | |
| 700 | free(metadata->conf); |
| 701 | free(metadata); |
| 702 | } |
| 703 | |
| 704 | /* |
| 705 | * Cleanup kernel session structure |
| 706 | * |
| 707 | * Should *NOT* be called with RCU read-side lock held. |
| 708 | */ |
| 709 | void trace_kernel_destroy_session(struct ltt_kernel_session *session) |
| 710 | { |
| 711 | struct ltt_kernel_channel *channel, *ctmp; |
| 712 | int ret; |
| 713 | |
| 714 | assert(session); |
| 715 | |
| 716 | DBG("[trace] Closing session fd %d", session->fd); |
| 717 | /* Close kernel fds */ |
| 718 | if (session->fd >= 0) { |
| 719 | ret = close(session->fd); |
| 720 | if (ret) { |
| 721 | PERROR("close"); |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | if (session->metadata_stream_fd >= 0) { |
| 726 | DBG("[trace] Closing metadata stream fd %d", session->metadata_stream_fd); |
| 727 | ret = close(session->metadata_stream_fd); |
| 728 | if (ret) { |
| 729 | PERROR("close"); |
| 730 | } |
| 731 | } |
| 732 | |
| 733 | if (session->metadata != NULL) { |
| 734 | trace_kernel_destroy_metadata(session->metadata); |
| 735 | } |
| 736 | |
| 737 | cds_list_for_each_entry_safe(channel, ctmp, &session->channel_list.head, list) { |
| 738 | trace_kernel_destroy_channel(channel); |
| 739 | } |
| 740 | } |
| 741 | |
| 742 | /* Free elements needed by destroy notifiers. */ |
| 743 | void trace_kernel_free_session(struct ltt_kernel_session *session) |
| 744 | { |
| 745 | /* Wipe consumer output object */ |
| 746 | consumer_output_put(session->consumer); |
| 747 | |
| 748 | free(session); |
| 749 | } |