| 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 _GNU_SOURCE |
| 19 | #include <stdio.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <string.h> |
| 22 | #include <unistd.h> |
| 23 | #include <inttypes.h> |
| 24 | |
| 25 | #include <common/common.h> |
| 26 | #include <common/defaults.h> |
| 27 | |
| 28 | #include "buffer-registry.h" |
| 29 | #include "trace-ust.h" |
| 30 | #include "utils.h" |
| 31 | |
| 32 | /* |
| 33 | * Match function for the events hash table lookup. |
| 34 | * |
| 35 | * Matches by name only. Used by the disable command. |
| 36 | */ |
| 37 | int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node, |
| 38 | const void *_key) |
| 39 | { |
| 40 | struct ltt_ust_event *event; |
| 41 | const char *name; |
| 42 | |
| 43 | assert(node); |
| 44 | assert(_key); |
| 45 | |
| 46 | event = caa_container_of(node, struct ltt_ust_event, node.node); |
| 47 | name = _key; |
| 48 | |
| 49 | /* Event name */ |
| 50 | if (strncmp(event->attr.name, name, sizeof(event->attr.name)) != 0) { |
| 51 | goto no_match; |
| 52 | } |
| 53 | |
| 54 | /* Match */ |
| 55 | return 1; |
| 56 | |
| 57 | no_match: |
| 58 | return 0; |
| 59 | } |
| 60 | |
| 61 | /* |
| 62 | * Match function for the hash table lookup. |
| 63 | * |
| 64 | * It matches an ust event based on three attributes which are the event name, |
| 65 | * the filter bytecode and the loglevel. |
| 66 | */ |
| 67 | int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key) |
| 68 | { |
| 69 | struct ltt_ust_event *event; |
| 70 | const struct ltt_ust_ht_key *key; |
| 71 | |
| 72 | assert(node); |
| 73 | assert(_key); |
| 74 | |
| 75 | event = caa_container_of(node, struct ltt_ust_event, node.node); |
| 76 | key = _key; |
| 77 | |
| 78 | /* Match the 3 elements of the key: name, filter and loglevel. */ |
| 79 | |
| 80 | /* Event name */ |
| 81 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { |
| 82 | goto no_match; |
| 83 | } |
| 84 | |
| 85 | /* Event loglevel. */ |
| 86 | if (event->attr.loglevel != key->loglevel) { |
| 87 | if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL |
| 88 | && key->loglevel == 0 && event->attr.loglevel == -1) { |
| 89 | /* |
| 90 | * Match is accepted. This is because on event creation, the |
| 91 | * loglevel is set to -1 if the event loglevel type is ALL so 0 and |
| 92 | * -1 are accepted for this loglevel type since 0 is the one set by |
| 93 | * the API when receiving an enable event. |
| 94 | */ |
| 95 | } else { |
| 96 | goto no_match; |
| 97 | } |
| 98 | } |
| 99 | |
| 100 | /* Only one of the filters is NULL, fail. */ |
| 101 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { |
| 102 | goto no_match; |
| 103 | } |
| 104 | |
| 105 | if (key->filter && event->filter) { |
| 106 | /* Both filters exists, check length followed by the bytecode. */ |
| 107 | if (event->filter->len != key->filter->len || |
| 108 | memcmp(event->filter->data, key->filter->data, |
| 109 | event->filter->len) != 0) { |
| 110 | goto no_match; |
| 111 | } |
| 112 | } |
| 113 | |
| 114 | /* Match. */ |
| 115 | return 1; |
| 116 | |
| 117 | no_match: |
| 118 | return 0; |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Find the channel in the hashtable and return channel pointer. RCU read side |
| 123 | * lock MUST be acquired before calling this. |
| 124 | */ |
| 125 | struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht, |
| 126 | char *name) |
| 127 | { |
| 128 | struct lttng_ht_node_str *node; |
| 129 | struct lttng_ht_iter iter; |
| 130 | |
| 131 | lttng_ht_lookup(ht, (void *)name, &iter); |
| 132 | node = lttng_ht_iter_get_node_str(&iter); |
| 133 | if (node == NULL) { |
| 134 | goto error; |
| 135 | } |
| 136 | |
| 137 | DBG2("Trace UST channel %s found by name", name); |
| 138 | |
| 139 | return caa_container_of(node, struct ltt_ust_channel, node); |
| 140 | |
| 141 | error: |
| 142 | DBG2("Trace UST channel %s not found by name", name); |
| 143 | return NULL; |
| 144 | } |
| 145 | |
| 146 | /* |
| 147 | * Find the event in the hashtable and return event pointer. RCU read side lock |
| 148 | * MUST be acquired before calling this. |
| 149 | */ |
| 150 | struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht, |
| 151 | char *name, struct lttng_filter_bytecode *filter, int loglevel) |
| 152 | { |
| 153 | struct lttng_ht_node_str *node; |
| 154 | struct lttng_ht_iter iter; |
| 155 | struct ltt_ust_ht_key key; |
| 156 | |
| 157 | assert(name); |
| 158 | assert(ht); |
| 159 | |
| 160 | key.name = name; |
| 161 | key.filter = filter; |
| 162 | key.loglevel = loglevel; |
| 163 | |
| 164 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), |
| 165 | trace_ust_ht_match_event, &key, &iter.iter); |
| 166 | node = lttng_ht_iter_get_node_str(&iter); |
| 167 | if (node == NULL) { |
| 168 | goto error; |
| 169 | } |
| 170 | |
| 171 | DBG2("Trace UST event %s found", key.name); |
| 172 | |
| 173 | return caa_container_of(node, struct ltt_ust_event, node); |
| 174 | |
| 175 | error: |
| 176 | DBG2("Trace UST event %s NOT found", key.name); |
| 177 | return NULL; |
| 178 | } |
| 179 | |
| 180 | /* |
| 181 | * Allocate and initialize a ust session data structure. |
| 182 | * |
| 183 | * Return pointer to structure or NULL. |
| 184 | */ |
| 185 | struct ltt_ust_session *trace_ust_create_session(uint64_t session_id) |
| 186 | { |
| 187 | struct ltt_ust_session *lus; |
| 188 | |
| 189 | /* Allocate a new ltt ust session */ |
| 190 | lus = zmalloc(sizeof(struct ltt_ust_session)); |
| 191 | if (lus == NULL) { |
| 192 | PERROR("create ust session zmalloc"); |
| 193 | goto error; |
| 194 | } |
| 195 | |
| 196 | /* Init data structure */ |
| 197 | lus->id = session_id; |
| 198 | lus->start_trace = 0; |
| 199 | |
| 200 | /* |
| 201 | * Default buffer type. This can be changed through an enable channel |
| 202 | * requesting a different type. Note that this can only be changed once |
| 203 | * during the session lifetime which is at the first enable channel and |
| 204 | * only before start. The flag buffer_type_changed indicates the status. |
| 205 | */ |
| 206 | lus->buffer_type = LTTNG_BUFFER_PER_PID; |
| 207 | /* Once set to 1, the buffer_type is immutable for the session. */ |
| 208 | lus->buffer_type_changed = 0; |
| 209 | /* Init it in case it get used after allocation. */ |
| 210 | CDS_INIT_LIST_HEAD(&lus->buffer_reg_uid_list); |
| 211 | |
| 212 | /* Alloc UST global domain channels' HT */ |
| 213 | lus->domain_global.channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
| 214 | |
| 215 | lus->consumer = consumer_create_output(CONSUMER_DST_LOCAL); |
| 216 | if (lus->consumer == NULL) { |
| 217 | goto error_consumer; |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * The tmp_consumer stays NULL until a set_consumer_uri command is |
| 222 | * executed. At this point, the consumer should be nullify until an |
| 223 | * enable_consumer command. This assignment is symbolic since we've zmalloc |
| 224 | * the struct. |
| 225 | */ |
| 226 | lus->tmp_consumer = NULL; |
| 227 | |
| 228 | DBG2("UST trace session create successful"); |
| 229 | |
| 230 | return lus; |
| 231 | |
| 232 | error_consumer: |
| 233 | ht_cleanup_push(lus->domain_global.channels); |
| 234 | free(lus); |
| 235 | error: |
| 236 | return NULL; |
| 237 | } |
| 238 | |
| 239 | /* |
| 240 | * Allocate and initialize a ust channel data structure. |
| 241 | * |
| 242 | * Return pointer to structure or NULL. |
| 243 | */ |
| 244 | struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan) |
| 245 | { |
| 246 | struct ltt_ust_channel *luc; |
| 247 | |
| 248 | assert(chan); |
| 249 | |
| 250 | luc = zmalloc(sizeof(struct ltt_ust_channel)); |
| 251 | if (luc == NULL) { |
| 252 | PERROR("ltt_ust_channel zmalloc"); |
| 253 | goto error; |
| 254 | } |
| 255 | |
| 256 | /* Copy UST channel attributes */ |
| 257 | luc->attr.overwrite = chan->attr.overwrite; |
| 258 | luc->attr.subbuf_size = chan->attr.subbuf_size; |
| 259 | luc->attr.num_subbuf = chan->attr.num_subbuf; |
| 260 | luc->attr.switch_timer_interval = chan->attr.switch_timer_interval; |
| 261 | luc->attr.read_timer_interval = chan->attr.read_timer_interval; |
| 262 | luc->attr.output = (enum lttng_ust_output) chan->attr.output; |
| 263 | |
| 264 | /* Translate to UST output enum */ |
| 265 | switch (luc->attr.output) { |
| 266 | default: |
| 267 | luc->attr.output = LTTNG_UST_MMAP; |
| 268 | break; |
| 269 | } |
| 270 | |
| 271 | /* Copy channel name */ |
| 272 | strncpy(luc->name, chan->name, sizeof(luc->name)); |
| 273 | luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; |
| 274 | |
| 275 | /* Init node */ |
| 276 | lttng_ht_node_init_str(&luc->node, luc->name); |
| 277 | /* Alloc hash tables */ |
| 278 | luc->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
| 279 | luc->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 280 | |
| 281 | /* On-disk circular buffer parameters */ |
| 282 | luc->tracefile_size = chan->attr.tracefile_size; |
| 283 | luc->tracefile_count = chan->attr.tracefile_count; |
| 284 | |
| 285 | DBG2("Trace UST channel %s created", luc->name); |
| 286 | |
| 287 | error: |
| 288 | return luc; |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * Allocate and initialize a ust event. Set name and event type. |
| 293 | * |
| 294 | * Return pointer to structure or NULL. |
| 295 | */ |
| 296 | struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev, |
| 297 | struct lttng_filter_bytecode *filter) |
| 298 | { |
| 299 | struct ltt_ust_event *lue; |
| 300 | |
| 301 | assert(ev); |
| 302 | |
| 303 | lue = zmalloc(sizeof(struct ltt_ust_event)); |
| 304 | if (lue == NULL) { |
| 305 | PERROR("ust event zmalloc"); |
| 306 | goto error; |
| 307 | } |
| 308 | |
| 309 | switch (ev->type) { |
| 310 | case LTTNG_EVENT_PROBE: |
| 311 | lue->attr.instrumentation = LTTNG_UST_PROBE; |
| 312 | break; |
| 313 | case LTTNG_EVENT_FUNCTION: |
| 314 | lue->attr.instrumentation = LTTNG_UST_FUNCTION; |
| 315 | break; |
| 316 | case LTTNG_EVENT_FUNCTION_ENTRY: |
| 317 | lue->attr.instrumentation = LTTNG_UST_FUNCTION; |
| 318 | break; |
| 319 | case LTTNG_EVENT_TRACEPOINT: |
| 320 | lue->attr.instrumentation = LTTNG_UST_TRACEPOINT; |
| 321 | break; |
| 322 | default: |
| 323 | ERR("Unknown ust instrumentation type (%d)", ev->type); |
| 324 | goto error_free_event; |
| 325 | } |
| 326 | |
| 327 | /* Copy event name */ |
| 328 | strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN); |
| 329 | lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; |
| 330 | |
| 331 | switch (ev->loglevel_type) { |
| 332 | case LTTNG_EVENT_LOGLEVEL_ALL: |
| 333 | lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_ALL; |
| 334 | lue->attr.loglevel = -1; /* Force to -1 */ |
| 335 | break; |
| 336 | case LTTNG_EVENT_LOGLEVEL_RANGE: |
| 337 | lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_RANGE; |
| 338 | lue->attr.loglevel = ev->loglevel; |
| 339 | break; |
| 340 | case LTTNG_EVENT_LOGLEVEL_SINGLE: |
| 341 | lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE; |
| 342 | lue->attr.loglevel = ev->loglevel; |
| 343 | break; |
| 344 | default: |
| 345 | ERR("Unknown ust loglevel type (%d)", ev->loglevel_type); |
| 346 | goto error_free_event; |
| 347 | } |
| 348 | |
| 349 | /* Same layout. */ |
| 350 | lue->filter = (struct lttng_ust_filter_bytecode *) filter; |
| 351 | |
| 352 | /* Init node */ |
| 353 | lttng_ht_node_init_str(&lue->node, lue->attr.name); |
| 354 | |
| 355 | DBG2("Trace UST event %s, loglevel (%d,%d) created", |
| 356 | lue->attr.name, lue->attr.loglevel_type, |
| 357 | lue->attr.loglevel); |
| 358 | |
| 359 | return lue; |
| 360 | |
| 361 | error_free_event: |
| 362 | free(lue); |
| 363 | error: |
| 364 | return NULL; |
| 365 | } |
| 366 | |
| 367 | /* |
| 368 | * Allocate and initialize a ust metadata. |
| 369 | * |
| 370 | * Return pointer to structure or NULL. |
| 371 | */ |
| 372 | struct ltt_ust_metadata *trace_ust_create_metadata(char *path) |
| 373 | { |
| 374 | int ret; |
| 375 | struct ltt_ust_metadata *lum; |
| 376 | |
| 377 | assert(path); |
| 378 | |
| 379 | lum = zmalloc(sizeof(struct ltt_ust_metadata)); |
| 380 | if (lum == NULL) { |
| 381 | PERROR("ust metadata zmalloc"); |
| 382 | goto error; |
| 383 | } |
| 384 | |
| 385 | /* Set default attributes */ |
| 386 | lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
| 387 | lum->attr.subbuf_size = default_get_metadata_subbuf_size(); |
| 388 | lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; |
| 389 | lum->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
| 390 | lum->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; |
| 391 | lum->attr.output = LTTNG_UST_MMAP; |
| 392 | |
| 393 | lum->handle = -1; |
| 394 | /* Set metadata trace path */ |
| 395 | ret = snprintf(lum->pathname, PATH_MAX, "%s/" DEFAULT_METADATA_NAME, path); |
| 396 | if (ret < 0) { |
| 397 | PERROR("asprintf ust metadata"); |
| 398 | goto error_free_metadata; |
| 399 | } |
| 400 | |
| 401 | return lum; |
| 402 | |
| 403 | error_free_metadata: |
| 404 | free(lum); |
| 405 | error: |
| 406 | return NULL; |
| 407 | } |
| 408 | |
| 409 | /* |
| 410 | * Allocate and initialize an UST context. |
| 411 | * |
| 412 | * Return pointer to structure or NULL. |
| 413 | */ |
| 414 | struct ltt_ust_context *trace_ust_create_context( |
| 415 | struct lttng_event_context *ctx) |
| 416 | { |
| 417 | struct ltt_ust_context *uctx; |
| 418 | enum lttng_ust_context_type utype; |
| 419 | |
| 420 | assert(ctx); |
| 421 | |
| 422 | switch (ctx->ctx) { |
| 423 | case LTTNG_EVENT_CONTEXT_VTID: |
| 424 | utype = LTTNG_UST_CONTEXT_VTID; |
| 425 | break; |
| 426 | case LTTNG_EVENT_CONTEXT_VPID: |
| 427 | utype = LTTNG_UST_CONTEXT_VPID; |
| 428 | break; |
| 429 | case LTTNG_EVENT_CONTEXT_PTHREAD_ID: |
| 430 | utype = LTTNG_UST_CONTEXT_PTHREAD_ID; |
| 431 | break; |
| 432 | case LTTNG_EVENT_CONTEXT_PROCNAME: |
| 433 | utype = LTTNG_UST_CONTEXT_PROCNAME; |
| 434 | break; |
| 435 | default: |
| 436 | ERR("Invalid UST context"); |
| 437 | return NULL; |
| 438 | } |
| 439 | |
| 440 | uctx = zmalloc(sizeof(struct ltt_ust_context)); |
| 441 | if (uctx == NULL) { |
| 442 | PERROR("zmalloc ltt_ust_context"); |
| 443 | goto error; |
| 444 | } |
| 445 | |
| 446 | uctx->ctx.ctx = utype; |
| 447 | lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx); |
| 448 | |
| 449 | return uctx; |
| 450 | |
| 451 | error: |
| 452 | return NULL; |
| 453 | } |
| 454 | |
| 455 | /* |
| 456 | * RCU safe free context structure. |
| 457 | */ |
| 458 | static void destroy_context_rcu(struct rcu_head *head) |
| 459 | { |
| 460 | struct lttng_ht_node_ulong *node = |
| 461 | caa_container_of(head, struct lttng_ht_node_ulong, head); |
| 462 | struct ltt_ust_context *ctx = |
| 463 | caa_container_of(node, struct ltt_ust_context, node); |
| 464 | |
| 465 | free(ctx); |
| 466 | } |
| 467 | |
| 468 | /* |
| 469 | * Cleanup UST context hash table. |
| 470 | */ |
| 471 | static void destroy_contexts(struct lttng_ht *ht) |
| 472 | { |
| 473 | int ret; |
| 474 | struct lttng_ht_node_ulong *node; |
| 475 | struct lttng_ht_iter iter; |
| 476 | |
| 477 | assert(ht); |
| 478 | |
| 479 | rcu_read_lock(); |
| 480 | cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) { |
| 481 | ret = lttng_ht_del(ht, &iter); |
| 482 | if (!ret) { |
| 483 | call_rcu(&node->head, destroy_context_rcu); |
| 484 | } |
| 485 | } |
| 486 | rcu_read_unlock(); |
| 487 | |
| 488 | ht_cleanup_push(ht); |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * Cleanup ust event structure. |
| 493 | */ |
| 494 | void trace_ust_destroy_event(struct ltt_ust_event *event) |
| 495 | { |
| 496 | assert(event); |
| 497 | |
| 498 | DBG2("Trace destroy UST event %s", event->attr.name); |
| 499 | free(event->filter); |
| 500 | free(event); |
| 501 | } |
| 502 | |
| 503 | /* |
| 504 | * URCU intermediate call to complete destroy event. |
| 505 | */ |
| 506 | static void destroy_event_rcu(struct rcu_head *head) |
| 507 | { |
| 508 | struct lttng_ht_node_str *node = |
| 509 | caa_container_of(head, struct lttng_ht_node_str, head); |
| 510 | struct ltt_ust_event *event = |
| 511 | caa_container_of(node, struct ltt_ust_event, node); |
| 512 | |
| 513 | trace_ust_destroy_event(event); |
| 514 | } |
| 515 | |
| 516 | /* |
| 517 | * Cleanup UST events hashtable. |
| 518 | */ |
| 519 | static void destroy_events(struct lttng_ht *events) |
| 520 | { |
| 521 | int ret; |
| 522 | struct lttng_ht_node_str *node; |
| 523 | struct lttng_ht_iter iter; |
| 524 | |
| 525 | assert(events); |
| 526 | |
| 527 | rcu_read_lock(); |
| 528 | cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) { |
| 529 | ret = lttng_ht_del(events, &iter); |
| 530 | assert(!ret); |
| 531 | call_rcu(&node->head, destroy_event_rcu); |
| 532 | } |
| 533 | rcu_read_unlock(); |
| 534 | |
| 535 | ht_cleanup_push(events); |
| 536 | } |
| 537 | |
| 538 | /* |
| 539 | * Cleanup ust channel structure. |
| 540 | * |
| 541 | * Should _NOT_ be called with RCU read lock held. |
| 542 | */ |
| 543 | static void _trace_ust_destroy_channel(struct ltt_ust_channel *channel) |
| 544 | { |
| 545 | assert(channel); |
| 546 | |
| 547 | DBG2("Trace destroy UST channel %s", channel->name); |
| 548 | |
| 549 | /* Destroying all events of the channel */ |
| 550 | destroy_events(channel->events); |
| 551 | /* Destroying all context of the channel */ |
| 552 | destroy_contexts(channel->ctx); |
| 553 | |
| 554 | free(channel); |
| 555 | } |
| 556 | |
| 557 | /* |
| 558 | * URCU intermediate call to complete destroy channel. |
| 559 | */ |
| 560 | static void destroy_channel_rcu(struct rcu_head *head) |
| 561 | { |
| 562 | struct lttng_ht_node_str *node = |
| 563 | caa_container_of(head, struct lttng_ht_node_str, head); |
| 564 | struct ltt_ust_channel *channel = |
| 565 | caa_container_of(node, struct ltt_ust_channel, node); |
| 566 | |
| 567 | _trace_ust_destroy_channel(channel); |
| 568 | } |
| 569 | |
| 570 | void trace_ust_destroy_channel(struct ltt_ust_channel *channel) |
| 571 | { |
| 572 | call_rcu(&channel->node.head, destroy_channel_rcu); |
| 573 | } |
| 574 | |
| 575 | /* |
| 576 | * Remove an UST channel from a channel HT. |
| 577 | */ |
| 578 | void trace_ust_delete_channel(struct lttng_ht *ht, |
| 579 | struct ltt_ust_channel *channel) |
| 580 | { |
| 581 | int ret; |
| 582 | struct lttng_ht_iter iter; |
| 583 | |
| 584 | assert(ht); |
| 585 | assert(channel); |
| 586 | |
| 587 | iter.iter.node = &channel->node.node; |
| 588 | ret = lttng_ht_del(ht, &iter); |
| 589 | assert(!ret); |
| 590 | } |
| 591 | |
| 592 | /* |
| 593 | * Cleanup ust metadata structure. |
| 594 | */ |
| 595 | void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata) |
| 596 | { |
| 597 | assert(metadata); |
| 598 | |
| 599 | if (!metadata->handle) { |
| 600 | return; |
| 601 | } |
| 602 | DBG2("Trace UST destroy metadata %d", metadata->handle); |
| 603 | free(metadata); |
| 604 | } |
| 605 | |
| 606 | /* |
| 607 | * Iterate over a hash table containing channels and cleanup safely. |
| 608 | */ |
| 609 | static void destroy_channels(struct lttng_ht *channels) |
| 610 | { |
| 611 | int ret; |
| 612 | struct lttng_ht_node_str *node; |
| 613 | struct lttng_ht_iter iter; |
| 614 | |
| 615 | assert(channels); |
| 616 | |
| 617 | rcu_read_lock(); |
| 618 | |
| 619 | cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) { |
| 620 | ret = lttng_ht_del(channels, &iter); |
| 621 | assert(!ret); |
| 622 | call_rcu(&node->head, destroy_channel_rcu); |
| 623 | } |
| 624 | rcu_read_unlock(); |
| 625 | |
| 626 | ht_cleanup_push(channels); |
| 627 | } |
| 628 | |
| 629 | /* |
| 630 | * Cleanup UST global domain. |
| 631 | */ |
| 632 | static void destroy_domain_global(struct ltt_ust_domain_global *dom) |
| 633 | { |
| 634 | assert(dom); |
| 635 | |
| 636 | destroy_channels(dom->channels); |
| 637 | } |
| 638 | |
| 639 | /* |
| 640 | * Cleanup ust session structure |
| 641 | * |
| 642 | * Should *NOT* be called with RCU read-side lock held. |
| 643 | */ |
| 644 | void trace_ust_destroy_session(struct ltt_ust_session *session) |
| 645 | { |
| 646 | struct buffer_reg_uid *reg, *sreg; |
| 647 | |
| 648 | assert(session); |
| 649 | |
| 650 | DBG2("Trace UST destroy session %" PRIu64, session->id); |
| 651 | |
| 652 | /* Cleaning up UST domain */ |
| 653 | destroy_domain_global(&session->domain_global); |
| 654 | |
| 655 | /* Cleanup UID buffer registry object(s). */ |
| 656 | cds_list_for_each_entry_safe(reg, sreg, &session->buffer_reg_uid_list, |
| 657 | lnode) { |
| 658 | cds_list_del(®->lnode); |
| 659 | buffer_reg_uid_remove(reg); |
| 660 | buffer_reg_uid_destroy(reg, session->consumer); |
| 661 | } |
| 662 | |
| 663 | consumer_destroy_output(session->consumer); |
| 664 | consumer_destroy_output(session->tmp_consumer); |
| 665 | |
| 666 | free(session); |
| 667 | } |