| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License, version 2 only, |
| 7 | * as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | */ |
| 18 | |
| 19 | #define _LGPL_SOURCE |
| 20 | #include <stdio.h> |
| 21 | #include <stdlib.h> |
| 22 | #include <string.h> |
| 23 | #include <unistd.h> |
| 24 | #include <inttypes.h> |
| 25 | |
| 26 | #include <common/common.h> |
| 27 | #include <common/defaults.h> |
| 28 | #include <common/trace-chunk.h> |
| 29 | |
| 30 | #include "buffer-registry.h" |
| 31 | #include "trace-ust.h" |
| 32 | #include "utils.h" |
| 33 | #include "ust-app.h" |
| 34 | #include "agent.h" |
| 35 | |
| 36 | /* |
| 37 | * Match function for the events hash table lookup. |
| 38 | * |
| 39 | * Matches by name only. Used by the disable command. |
| 40 | */ |
| 41 | int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node, |
| 42 | const void *_key) |
| 43 | { |
| 44 | struct ltt_ust_event *event; |
| 45 | const char *name; |
| 46 | |
| 47 | assert(node); |
| 48 | assert(_key); |
| 49 | |
| 50 | event = caa_container_of(node, struct ltt_ust_event, node.node); |
| 51 | name = _key; |
| 52 | |
| 53 | /* Event name */ |
| 54 | if (strncmp(event->attr.name, name, sizeof(event->attr.name)) != 0) { |
| 55 | goto no_match; |
| 56 | } |
| 57 | |
| 58 | /* Match */ |
| 59 | return 1; |
| 60 | |
| 61 | no_match: |
| 62 | return 0; |
| 63 | } |
| 64 | |
| 65 | /* |
| 66 | * Match function for the hash table lookup. |
| 67 | * |
| 68 | * It matches an ust event based on three attributes which are the event name, |
| 69 | * the filter bytecode and the loglevel. |
| 70 | */ |
| 71 | int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key) |
| 72 | { |
| 73 | struct ltt_ust_event *event; |
| 74 | const struct ltt_ust_ht_key *key; |
| 75 | int ev_loglevel_value; |
| 76 | int ll_match; |
| 77 | |
| 78 | assert(node); |
| 79 | assert(_key); |
| 80 | |
| 81 | event = caa_container_of(node, struct ltt_ust_event, node.node); |
| 82 | key = _key; |
| 83 | ev_loglevel_value = event->attr.loglevel; |
| 84 | |
| 85 | /* Match the 4 elements of the key: name, filter, loglevel, exclusions. */ |
| 86 | |
| 87 | /* Event name */ |
| 88 | if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) { |
| 89 | goto no_match; |
| 90 | } |
| 91 | |
| 92 | /* Event loglevel value and type. */ |
| 93 | ll_match = loglevels_match(event->attr.loglevel_type, |
| 94 | ev_loglevel_value, key->loglevel_type, |
| 95 | key->loglevel_value, LTTNG_UST_LOGLEVEL_ALL); |
| 96 | |
| 97 | if (!ll_match) { |
| 98 | goto no_match; |
| 99 | } |
| 100 | |
| 101 | /* Only one of the filters is NULL, fail. */ |
| 102 | if ((key->filter && !event->filter) || (!key->filter && event->filter)) { |
| 103 | goto no_match; |
| 104 | } |
| 105 | |
| 106 | if (key->filter && event->filter) { |
| 107 | /* Both filters exists, check length followed by the bytecode. */ |
| 108 | if (event->filter->len != key->filter->len || |
| 109 | memcmp(event->filter->data, key->filter->data, |
| 110 | event->filter->len) != 0) { |
| 111 | goto no_match; |
| 112 | } |
| 113 | } |
| 114 | |
| 115 | /* If only one of the exclusions is NULL, fail. */ |
| 116 | if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) { |
| 117 | goto no_match; |
| 118 | } |
| 119 | |
| 120 | if (key->exclusion && event->exclusion) { |
| 121 | size_t i; |
| 122 | |
| 123 | /* Check exclusion counts first. */ |
| 124 | if (event->exclusion->count != key->exclusion->count) { |
| 125 | goto no_match; |
| 126 | } |
| 127 | |
| 128 | /* Compare names individually. */ |
| 129 | for (i = 0; i < event->exclusion->count; ++i) { |
| 130 | size_t j; |
| 131 | bool found = false; |
| 132 | const char *name_ev = |
| 133 | LTTNG_EVENT_EXCLUSION_NAME_AT( |
| 134 | event->exclusion, i); |
| 135 | |
| 136 | /* |
| 137 | * Compare this exclusion name to all the key's |
| 138 | * exclusion names. |
| 139 | */ |
| 140 | for (j = 0; j < key->exclusion->count; ++j) { |
| 141 | const char *name_key = |
| 142 | LTTNG_EVENT_EXCLUSION_NAME_AT( |
| 143 | key->exclusion, j); |
| 144 | |
| 145 | if (!strncmp(name_ev, name_key, |
| 146 | LTTNG_SYMBOL_NAME_LEN)) { |
| 147 | /* Names match! */ |
| 148 | found = true; |
| 149 | break; |
| 150 | } |
| 151 | } |
| 152 | |
| 153 | /* |
| 154 | * If the current exclusion name was not found amongst |
| 155 | * the key's exclusion names, then there's no match. |
| 156 | */ |
| 157 | if (!found) { |
| 158 | goto no_match; |
| 159 | } |
| 160 | } |
| 161 | } |
| 162 | /* Match. */ |
| 163 | return 1; |
| 164 | |
| 165 | no_match: |
| 166 | return 0; |
| 167 | } |
| 168 | |
| 169 | /* |
| 170 | * Find the channel in the hashtable and return channel pointer. RCU read side |
| 171 | * lock MUST be acquired before calling this. |
| 172 | */ |
| 173 | struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht, |
| 174 | const char *name) |
| 175 | { |
| 176 | struct lttng_ht_node_str *node; |
| 177 | struct lttng_ht_iter iter; |
| 178 | |
| 179 | /* |
| 180 | * If we receive an empty string for channel name, it means the |
| 181 | * default channel name is requested. |
| 182 | */ |
| 183 | if (name[0] == '\0') |
| 184 | name = DEFAULT_CHANNEL_NAME; |
| 185 | |
| 186 | lttng_ht_lookup(ht, (void *)name, &iter); |
| 187 | node = lttng_ht_iter_get_node_str(&iter); |
| 188 | if (node == NULL) { |
| 189 | goto error; |
| 190 | } |
| 191 | |
| 192 | DBG2("Trace UST channel %s found by name", name); |
| 193 | |
| 194 | return caa_container_of(node, struct ltt_ust_channel, node); |
| 195 | |
| 196 | error: |
| 197 | DBG2("Trace UST channel %s not found by name", name); |
| 198 | return NULL; |
| 199 | } |
| 200 | |
| 201 | /* |
| 202 | * Find the event in the hashtable and return event pointer. RCU read side lock |
| 203 | * MUST be acquired before calling this. |
| 204 | */ |
| 205 | struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht, |
| 206 | char *name, struct lttng_filter_bytecode *filter, |
| 207 | enum lttng_ust_loglevel_type loglevel_type, int loglevel_value, |
| 208 | struct lttng_event_exclusion *exclusion) |
| 209 | { |
| 210 | struct lttng_ht_node_str *node; |
| 211 | struct lttng_ht_iter iter; |
| 212 | struct ltt_ust_ht_key key; |
| 213 | |
| 214 | assert(name); |
| 215 | assert(ht); |
| 216 | |
| 217 | key.name = name; |
| 218 | key.filter = filter; |
| 219 | key.loglevel_type = loglevel_type; |
| 220 | key.loglevel_value = loglevel_value; |
| 221 | key.exclusion = exclusion; |
| 222 | |
| 223 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed), |
| 224 | trace_ust_ht_match_event, &key, &iter.iter); |
| 225 | node = lttng_ht_iter_get_node_str(&iter); |
| 226 | if (node == NULL) { |
| 227 | goto error; |
| 228 | } |
| 229 | |
| 230 | DBG2("Trace UST event %s found", key.name); |
| 231 | |
| 232 | return caa_container_of(node, struct ltt_ust_event, node); |
| 233 | |
| 234 | error: |
| 235 | DBG2("Trace UST event %s NOT found", key.name); |
| 236 | return NULL; |
| 237 | } |
| 238 | |
| 239 | /* |
| 240 | * Lookup an agent in the session agents hash table by domain type and return |
| 241 | * the object if found else NULL. |
| 242 | * |
| 243 | * RCU read side lock must be acquired before calling and only released |
| 244 | * once the agent is no longer in scope or being used. |
| 245 | */ |
| 246 | struct agent *trace_ust_find_agent(struct ltt_ust_session *session, |
| 247 | enum lttng_domain_type domain_type) |
| 248 | { |
| 249 | struct agent *agt = NULL; |
| 250 | struct lttng_ht_node_u64 *node; |
| 251 | struct lttng_ht_iter iter; |
| 252 | uint64_t key; |
| 253 | |
| 254 | assert(session); |
| 255 | |
| 256 | DBG3("Trace ust agent lookup for domain %d", domain_type); |
| 257 | |
| 258 | key = domain_type; |
| 259 | |
| 260 | lttng_ht_lookup(session->agents, &key, &iter); |
| 261 | node = lttng_ht_iter_get_node_u64(&iter); |
| 262 | if (!node) { |
| 263 | goto end; |
| 264 | } |
| 265 | agt = caa_container_of(node, struct agent, node); |
| 266 | |
| 267 | end: |
| 268 | return agt; |
| 269 | } |
| 270 | |
| 271 | /* |
| 272 | * Allocate and initialize a ust session data structure. |
| 273 | * |
| 274 | * Return pointer to structure or NULL. |
| 275 | */ |
| 276 | struct ltt_ust_session *trace_ust_create_session(uint64_t session_id) |
| 277 | { |
| 278 | struct ltt_ust_session *lus; |
| 279 | |
| 280 | /* Allocate a new ltt ust session */ |
| 281 | lus = zmalloc(sizeof(struct ltt_ust_session)); |
| 282 | if (lus == NULL) { |
| 283 | PERROR("create ust session zmalloc"); |
| 284 | goto error; |
| 285 | } |
| 286 | |
| 287 | /* Init data structure */ |
| 288 | lus->id = session_id; |
| 289 | lus->active = 0; |
| 290 | |
| 291 | /* Set default metadata channel attribute. */ |
| 292 | lus->metadata_attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
| 293 | lus->metadata_attr.subbuf_size = default_get_metadata_subbuf_size(); |
| 294 | lus->metadata_attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM; |
| 295 | lus->metadata_attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER; |
| 296 | lus->metadata_attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER; |
| 297 | lus->metadata_attr.output = LTTNG_UST_MMAP; |
| 298 | |
| 299 | /* |
| 300 | * Default buffer type. This can be changed through an enable channel |
| 301 | * requesting a different type. Note that this can only be changed once |
| 302 | * during the session lifetime which is at the first enable channel and |
| 303 | * only before start. The flag buffer_type_changed indicates the status. |
| 304 | */ |
| 305 | lus->buffer_type = LTTNG_BUFFER_PER_UID; |
| 306 | /* Once set to 1, the buffer_type is immutable for the session. */ |
| 307 | lus->buffer_type_changed = 0; |
| 308 | /* Init it in case it get used after allocation. */ |
| 309 | CDS_INIT_LIST_HEAD(&lus->buffer_reg_uid_list); |
| 310 | |
| 311 | /* Alloc UST global domain channels' HT */ |
| 312 | lus->domain_global.channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
| 313 | /* Alloc agent hash table. */ |
| 314 | lus->agents = lttng_ht_new(0, LTTNG_HT_TYPE_U64); |
| 315 | |
| 316 | lus->consumer = consumer_create_output(CONSUMER_DST_LOCAL); |
| 317 | if (lus->consumer == NULL) { |
| 318 | goto error_consumer; |
| 319 | } |
| 320 | |
| 321 | DBG2("UST trace session create successful"); |
| 322 | |
| 323 | return lus; |
| 324 | |
| 325 | error_consumer: |
| 326 | ht_cleanup_push(lus->domain_global.channels); |
| 327 | ht_cleanup_push(lus->agents); |
| 328 | free(lus); |
| 329 | error: |
| 330 | return NULL; |
| 331 | } |
| 332 | |
| 333 | /* |
| 334 | * Allocate and initialize a ust channel data structure. |
| 335 | * |
| 336 | * Return pointer to structure or NULL. |
| 337 | */ |
| 338 | struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan, |
| 339 | enum lttng_domain_type domain) |
| 340 | { |
| 341 | struct ltt_ust_channel *luc; |
| 342 | |
| 343 | assert(chan); |
| 344 | |
| 345 | luc = zmalloc(sizeof(struct ltt_ust_channel)); |
| 346 | if (luc == NULL) { |
| 347 | PERROR("ltt_ust_channel zmalloc"); |
| 348 | goto error; |
| 349 | } |
| 350 | |
| 351 | luc->domain = domain; |
| 352 | |
| 353 | /* Copy UST channel attributes */ |
| 354 | luc->attr.overwrite = chan->attr.overwrite; |
| 355 | luc->attr.subbuf_size = chan->attr.subbuf_size; |
| 356 | luc->attr.num_subbuf = chan->attr.num_subbuf; |
| 357 | luc->attr.switch_timer_interval = chan->attr.switch_timer_interval; |
| 358 | luc->attr.read_timer_interval = chan->attr.read_timer_interval; |
| 359 | luc->attr.output = (enum lttng_ust_output) chan->attr.output; |
| 360 | luc->monitor_timer_interval = ((struct lttng_channel_extended *) |
| 361 | chan->attr.extended.ptr)->monitor_timer_interval; |
| 362 | luc->attr.u.s.blocking_timeout = ((struct lttng_channel_extended *) |
| 363 | chan->attr.extended.ptr)->blocking_timeout; |
| 364 | |
| 365 | /* Translate to UST output enum */ |
| 366 | switch (luc->attr.output) { |
| 367 | default: |
| 368 | luc->attr.output = LTTNG_UST_MMAP; |
| 369 | break; |
| 370 | } |
| 371 | |
| 372 | /* |
| 373 | * If we receive an empty string for channel name, it means the |
| 374 | * default channel name is requested. |
| 375 | */ |
| 376 | if (chan->name[0] == '\0') { |
| 377 | strncpy(luc->name, DEFAULT_CHANNEL_NAME, sizeof(luc->name)); |
| 378 | } else { |
| 379 | /* Copy channel name */ |
| 380 | strncpy(luc->name, chan->name, sizeof(luc->name)); |
| 381 | } |
| 382 | luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; |
| 383 | |
| 384 | /* Init node */ |
| 385 | lttng_ht_node_init_str(&luc->node, luc->name); |
| 386 | CDS_INIT_LIST_HEAD(&luc->ctx_list); |
| 387 | |
| 388 | /* Alloc hash tables */ |
| 389 | luc->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
| 390 | luc->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 391 | |
| 392 | /* On-disk circular buffer parameters */ |
| 393 | luc->tracefile_size = chan->attr.tracefile_size; |
| 394 | luc->tracefile_count = chan->attr.tracefile_count; |
| 395 | |
| 396 | DBG2("Trace UST channel %s created", luc->name); |
| 397 | |
| 398 | error: |
| 399 | return luc; |
| 400 | } |
| 401 | |
| 402 | /* |
| 403 | * Validates an exclusion list. |
| 404 | * |
| 405 | * Returns 0 if valid, negative value if invalid. |
| 406 | */ |
| 407 | static int validate_exclusion(struct lttng_event_exclusion *exclusion) |
| 408 | { |
| 409 | size_t i; |
| 410 | int ret = 0; |
| 411 | |
| 412 | assert(exclusion); |
| 413 | |
| 414 | for (i = 0; i < exclusion->count; ++i) { |
| 415 | size_t j; |
| 416 | const char *name_a = |
| 417 | LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, i); |
| 418 | |
| 419 | for (j = 0; j < i; ++j) { |
| 420 | const char *name_b = |
| 421 | LTTNG_EVENT_EXCLUSION_NAME_AT(exclusion, j); |
| 422 | |
| 423 | if (!strncmp(name_a, name_b, LTTNG_SYMBOL_NAME_LEN)) { |
| 424 | /* Match! */ |
| 425 | ret = -1; |
| 426 | goto end; |
| 427 | } |
| 428 | } |
| 429 | } |
| 430 | |
| 431 | end: |
| 432 | return ret; |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * Allocate and initialize a ust event. Set name and event type. |
| 437 | * We own filter_expression, filter, and exclusion. |
| 438 | * |
| 439 | * Return an lttng_error_code |
| 440 | */ |
| 441 | enum lttng_error_code trace_ust_create_event(struct lttng_event *ev, |
| 442 | char *filter_expression, |
| 443 | struct lttng_filter_bytecode *filter, |
| 444 | struct lttng_event_exclusion *exclusion, |
| 445 | bool internal_event, |
| 446 | struct ltt_ust_event **ust_event) |
| 447 | { |
| 448 | struct ltt_ust_event *local_ust_event; |
| 449 | enum lttng_error_code ret = LTTNG_OK; |
| 450 | |
| 451 | assert(ev); |
| 452 | |
| 453 | if (exclusion && validate_exclusion(exclusion)) { |
| 454 | ret = LTTNG_ERR_INVALID; |
| 455 | goto error; |
| 456 | } |
| 457 | |
| 458 | local_ust_event = zmalloc(sizeof(struct ltt_ust_event)); |
| 459 | if (local_ust_event == NULL) { |
| 460 | PERROR("ust event zmalloc"); |
| 461 | ret = LTTNG_ERR_NOMEM; |
| 462 | goto error; |
| 463 | } |
| 464 | |
| 465 | local_ust_event->internal = internal_event; |
| 466 | |
| 467 | switch (ev->type) { |
| 468 | case LTTNG_EVENT_PROBE: |
| 469 | local_ust_event->attr.instrumentation = LTTNG_UST_PROBE; |
| 470 | break; |
| 471 | case LTTNG_EVENT_FUNCTION: |
| 472 | local_ust_event->attr.instrumentation = LTTNG_UST_FUNCTION; |
| 473 | break; |
| 474 | case LTTNG_EVENT_FUNCTION_ENTRY: |
| 475 | local_ust_event->attr.instrumentation = LTTNG_UST_FUNCTION; |
| 476 | break; |
| 477 | case LTTNG_EVENT_TRACEPOINT: |
| 478 | local_ust_event->attr.instrumentation = LTTNG_UST_TRACEPOINT; |
| 479 | break; |
| 480 | default: |
| 481 | ERR("Unknown ust instrumentation type (%d)", ev->type); |
| 482 | ret = LTTNG_ERR_INVALID; |
| 483 | goto error_free_event; |
| 484 | } |
| 485 | |
| 486 | /* Copy event name */ |
| 487 | strncpy(local_ust_event->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN); |
| 488 | local_ust_event->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; |
| 489 | |
| 490 | switch (ev->loglevel_type) { |
| 491 | case LTTNG_EVENT_LOGLEVEL_ALL: |
| 492 | local_ust_event->attr.loglevel_type = LTTNG_UST_LOGLEVEL_ALL; |
| 493 | local_ust_event->attr.loglevel = -1; /* Force to -1 */ |
| 494 | break; |
| 495 | case LTTNG_EVENT_LOGLEVEL_RANGE: |
| 496 | local_ust_event->attr.loglevel_type = LTTNG_UST_LOGLEVEL_RANGE; |
| 497 | local_ust_event->attr.loglevel = ev->loglevel; |
| 498 | break; |
| 499 | case LTTNG_EVENT_LOGLEVEL_SINGLE: |
| 500 | local_ust_event->attr.loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE; |
| 501 | local_ust_event->attr.loglevel = ev->loglevel; |
| 502 | break; |
| 503 | default: |
| 504 | ERR("Unknown ust loglevel type (%d)", ev->loglevel_type); |
| 505 | ret = LTTNG_ERR_INVALID; |
| 506 | goto error_free_event; |
| 507 | } |
| 508 | |
| 509 | /* Same layout. */ |
| 510 | local_ust_event->filter_expression = filter_expression; |
| 511 | local_ust_event->filter = filter; |
| 512 | local_ust_event->exclusion = exclusion; |
| 513 | |
| 514 | /* Init node */ |
| 515 | lttng_ht_node_init_str(&local_ust_event->node, local_ust_event->attr.name); |
| 516 | |
| 517 | DBG2("Trace UST event %s, loglevel (%d,%d) created", |
| 518 | local_ust_event->attr.name, local_ust_event->attr.loglevel_type, |
| 519 | local_ust_event->attr.loglevel); |
| 520 | |
| 521 | *ust_event = local_ust_event; |
| 522 | |
| 523 | return ret; |
| 524 | |
| 525 | error_free_event: |
| 526 | free(local_ust_event); |
| 527 | error: |
| 528 | free(filter_expression); |
| 529 | free(filter); |
| 530 | free(exclusion); |
| 531 | return ret; |
| 532 | } |
| 533 | |
| 534 | static |
| 535 | int trace_ust_context_type_event_to_ust( |
| 536 | enum lttng_event_context_type type) |
| 537 | { |
| 538 | int utype; |
| 539 | |
| 540 | switch (type) { |
| 541 | case LTTNG_EVENT_CONTEXT_VTID: |
| 542 | utype = LTTNG_UST_CONTEXT_VTID; |
| 543 | break; |
| 544 | case LTTNG_EVENT_CONTEXT_VPID: |
| 545 | utype = LTTNG_UST_CONTEXT_VPID; |
| 546 | break; |
| 547 | case LTTNG_EVENT_CONTEXT_PTHREAD_ID: |
| 548 | utype = LTTNG_UST_CONTEXT_PTHREAD_ID; |
| 549 | break; |
| 550 | case LTTNG_EVENT_CONTEXT_PROCNAME: |
| 551 | utype = LTTNG_UST_CONTEXT_PROCNAME; |
| 552 | break; |
| 553 | case LTTNG_EVENT_CONTEXT_IP: |
| 554 | utype = LTTNG_UST_CONTEXT_IP; |
| 555 | break; |
| 556 | case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER: |
| 557 | if (!ustctl_has_perf_counters()) { |
| 558 | utype = -1; |
| 559 | WARN("Perf counters not implemented in UST"); |
| 560 | } else { |
| 561 | utype = LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER; |
| 562 | } |
| 563 | break; |
| 564 | case LTTNG_EVENT_CONTEXT_APP_CONTEXT: |
| 565 | utype = LTTNG_UST_CONTEXT_APP_CONTEXT; |
| 566 | break; |
| 567 | case LTTNG_EVENT_CONTEXT_CGROUP_NS: |
| 568 | utype = LTTNG_UST_CONTEXT_CGROUP_NS; |
| 569 | break; |
| 570 | case LTTNG_EVENT_CONTEXT_IPC_NS: |
| 571 | utype = LTTNG_UST_CONTEXT_IPC_NS; |
| 572 | break; |
| 573 | case LTTNG_EVENT_CONTEXT_MNT_NS: |
| 574 | utype = LTTNG_UST_CONTEXT_MNT_NS; |
| 575 | break; |
| 576 | case LTTNG_EVENT_CONTEXT_NET_NS: |
| 577 | utype = LTTNG_UST_CONTEXT_NET_NS; |
| 578 | break; |
| 579 | case LTTNG_EVENT_CONTEXT_PID_NS: |
| 580 | utype = LTTNG_UST_CONTEXT_PID_NS; |
| 581 | break; |
| 582 | case LTTNG_EVENT_CONTEXT_USER_NS: |
| 583 | utype = LTTNG_UST_CONTEXT_USER_NS; |
| 584 | break; |
| 585 | case LTTNG_EVENT_CONTEXT_UTS_NS: |
| 586 | utype = LTTNG_UST_CONTEXT_UTS_NS; |
| 587 | break; |
| 588 | default: |
| 589 | utype = -1; |
| 590 | break; |
| 591 | } |
| 592 | return utype; |
| 593 | } |
| 594 | |
| 595 | /* |
| 596 | * Return 1 if contexts match, 0 otherwise. |
| 597 | */ |
| 598 | int trace_ust_match_context(const struct ltt_ust_context *uctx, |
| 599 | const struct lttng_event_context *ctx) |
| 600 | { |
| 601 | int utype; |
| 602 | |
| 603 | utype = trace_ust_context_type_event_to_ust(ctx->ctx); |
| 604 | if (utype < 0) { |
| 605 | return 0; |
| 606 | } |
| 607 | if (uctx->ctx.ctx != utype) { |
| 608 | return 0; |
| 609 | } |
| 610 | switch (utype) { |
| 611 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
| 612 | if (uctx->ctx.u.perf_counter.type |
| 613 | != ctx->u.perf_counter.type) { |
| 614 | return 0; |
| 615 | } |
| 616 | if (uctx->ctx.u.perf_counter.config |
| 617 | != ctx->u.perf_counter.config) { |
| 618 | return 0; |
| 619 | } |
| 620 | if (strncmp(uctx->ctx.u.perf_counter.name, |
| 621 | ctx->u.perf_counter.name, |
| 622 | LTTNG_UST_SYM_NAME_LEN)) { |
| 623 | return 0; |
| 624 | } |
| 625 | break; |
| 626 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
| 627 | assert(uctx->ctx.u.app_ctx.provider_name); |
| 628 | assert(uctx->ctx.u.app_ctx.ctx_name); |
| 629 | if (strcmp(uctx->ctx.u.app_ctx.provider_name, |
| 630 | ctx->u.app_ctx.provider_name) || |
| 631 | strcmp(uctx->ctx.u.app_ctx.ctx_name, |
| 632 | ctx->u.app_ctx.ctx_name)) { |
| 633 | return 0; |
| 634 | } |
| 635 | default: |
| 636 | break; |
| 637 | |
| 638 | } |
| 639 | return 1; |
| 640 | } |
| 641 | |
| 642 | /* |
| 643 | * Allocate and initialize an UST context. |
| 644 | * |
| 645 | * Return pointer to structure or NULL. |
| 646 | */ |
| 647 | struct ltt_ust_context *trace_ust_create_context( |
| 648 | const struct lttng_event_context *ctx) |
| 649 | { |
| 650 | struct ltt_ust_context *uctx = NULL; |
| 651 | int utype; |
| 652 | |
| 653 | assert(ctx); |
| 654 | |
| 655 | utype = trace_ust_context_type_event_to_ust(ctx->ctx); |
| 656 | if (utype < 0) { |
| 657 | ERR("Invalid UST context"); |
| 658 | goto end; |
| 659 | } |
| 660 | |
| 661 | uctx = zmalloc(sizeof(struct ltt_ust_context)); |
| 662 | if (!uctx) { |
| 663 | PERROR("zmalloc ltt_ust_context"); |
| 664 | goto end; |
| 665 | } |
| 666 | |
| 667 | uctx->ctx.ctx = (enum lttng_ust_context_type) utype; |
| 668 | switch (utype) { |
| 669 | case LTTNG_UST_CONTEXT_PERF_THREAD_COUNTER: |
| 670 | uctx->ctx.u.perf_counter.type = ctx->u.perf_counter.type; |
| 671 | uctx->ctx.u.perf_counter.config = ctx->u.perf_counter.config; |
| 672 | strncpy(uctx->ctx.u.perf_counter.name, ctx->u.perf_counter.name, |
| 673 | LTTNG_UST_SYM_NAME_LEN); |
| 674 | uctx->ctx.u.perf_counter.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; |
| 675 | break; |
| 676 | case LTTNG_UST_CONTEXT_APP_CONTEXT: |
| 677 | { |
| 678 | char *provider_name = NULL, *ctx_name = NULL; |
| 679 | |
| 680 | provider_name = strdup(ctx->u.app_ctx.provider_name); |
| 681 | if (!provider_name) { |
| 682 | goto error; |
| 683 | } |
| 684 | uctx->ctx.u.app_ctx.provider_name = provider_name; |
| 685 | |
| 686 | ctx_name = strdup(ctx->u.app_ctx.ctx_name); |
| 687 | if (!ctx_name) { |
| 688 | goto error; |
| 689 | } |
| 690 | uctx->ctx.u.app_ctx.ctx_name = ctx_name; |
| 691 | break; |
| 692 | } |
| 693 | default: |
| 694 | break; |
| 695 | } |
| 696 | lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx); |
| 697 | end: |
| 698 | return uctx; |
| 699 | error: |
| 700 | trace_ust_destroy_context(uctx); |
| 701 | return NULL; |
| 702 | } |
| 703 | |
| 704 | static |
| 705 | void destroy_pid_tracker_node_rcu(struct rcu_head *head) |
| 706 | { |
| 707 | struct ust_pid_tracker_node *tracker_node = |
| 708 | caa_container_of(head, struct ust_pid_tracker_node, node.head); |
| 709 | free(tracker_node); |
| 710 | } |
| 711 | |
| 712 | static |
| 713 | void destroy_pid_tracker_node(struct ust_pid_tracker_node *tracker_node) |
| 714 | { |
| 715 | |
| 716 | call_rcu(&tracker_node->node.head, destroy_pid_tracker_node_rcu); |
| 717 | } |
| 718 | |
| 719 | static |
| 720 | int init_pid_tracker(struct ust_pid_tracker *pid_tracker) |
| 721 | { |
| 722 | int ret = 0; |
| 723 | |
| 724 | pid_tracker->ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 725 | if (!pid_tracker->ht) { |
| 726 | ret = -1; |
| 727 | goto end; |
| 728 | } |
| 729 | |
| 730 | end: |
| 731 | return ret; |
| 732 | } |
| 733 | |
| 734 | /* |
| 735 | * Teardown pid tracker content, but don't free pid_tracker object. |
| 736 | */ |
| 737 | static |
| 738 | void fini_pid_tracker(struct ust_pid_tracker *pid_tracker) |
| 739 | { |
| 740 | struct ust_pid_tracker_node *tracker_node; |
| 741 | struct lttng_ht_iter iter; |
| 742 | |
| 743 | if (!pid_tracker->ht) { |
| 744 | return; |
| 745 | } |
| 746 | rcu_read_lock(); |
| 747 | cds_lfht_for_each_entry(pid_tracker->ht->ht, |
| 748 | &iter.iter, tracker_node, node.node) { |
| 749 | int ret = lttng_ht_del(pid_tracker->ht, &iter); |
| 750 | |
| 751 | assert(!ret); |
| 752 | destroy_pid_tracker_node(tracker_node); |
| 753 | } |
| 754 | rcu_read_unlock(); |
| 755 | ht_cleanup_push(pid_tracker->ht); |
| 756 | pid_tracker->ht = NULL; |
| 757 | } |
| 758 | |
| 759 | static |
| 760 | struct ust_pid_tracker_node *pid_tracker_lookup( |
| 761 | struct ust_pid_tracker *pid_tracker, int pid, |
| 762 | struct lttng_ht_iter *iter) |
| 763 | { |
| 764 | unsigned long _pid = (unsigned long) pid; |
| 765 | struct lttng_ht_node_ulong *node; |
| 766 | |
| 767 | lttng_ht_lookup(pid_tracker->ht, (void *) _pid, iter); |
| 768 | node = lttng_ht_iter_get_node_ulong(iter); |
| 769 | if (node) { |
| 770 | return caa_container_of(node, struct ust_pid_tracker_node, |
| 771 | node); |
| 772 | } else { |
| 773 | return NULL; |
| 774 | } |
| 775 | } |
| 776 | |
| 777 | static |
| 778 | int pid_tracker_add_pid(struct ust_pid_tracker *pid_tracker, int pid) |
| 779 | { |
| 780 | int retval = LTTNG_OK; |
| 781 | struct ust_pid_tracker_node *tracker_node; |
| 782 | struct lttng_ht_iter iter; |
| 783 | |
| 784 | if (pid < 0) { |
| 785 | retval = LTTNG_ERR_INVALID; |
| 786 | goto end; |
| 787 | } |
| 788 | tracker_node = pid_tracker_lookup(pid_tracker, pid, &iter); |
| 789 | if (tracker_node) { |
| 790 | /* Already exists. */ |
| 791 | retval = LTTNG_ERR_PID_TRACKED; |
| 792 | goto end; |
| 793 | } |
| 794 | tracker_node = zmalloc(sizeof(*tracker_node)); |
| 795 | if (!tracker_node) { |
| 796 | retval = LTTNG_ERR_NOMEM; |
| 797 | goto end; |
| 798 | } |
| 799 | lttng_ht_node_init_ulong(&tracker_node->node, (unsigned long) pid); |
| 800 | lttng_ht_add_unique_ulong(pid_tracker->ht, &tracker_node->node); |
| 801 | end: |
| 802 | return retval; |
| 803 | } |
| 804 | |
| 805 | static |
| 806 | int pid_tracker_del_pid(struct ust_pid_tracker *pid_tracker, int pid) |
| 807 | { |
| 808 | int retval = LTTNG_OK, ret; |
| 809 | struct ust_pid_tracker_node *tracker_node; |
| 810 | struct lttng_ht_iter iter; |
| 811 | |
| 812 | if (pid < 0) { |
| 813 | retval = LTTNG_ERR_INVALID; |
| 814 | goto end; |
| 815 | } |
| 816 | tracker_node = pid_tracker_lookup(pid_tracker, pid, &iter); |
| 817 | if (!tracker_node) { |
| 818 | /* Not found */ |
| 819 | retval = LTTNG_ERR_PID_NOT_TRACKED; |
| 820 | goto end; |
| 821 | } |
| 822 | ret = lttng_ht_del(pid_tracker->ht, &iter); |
| 823 | assert(!ret); |
| 824 | |
| 825 | destroy_pid_tracker_node(tracker_node); |
| 826 | end: |
| 827 | return retval; |
| 828 | } |
| 829 | |
| 830 | /* |
| 831 | * The session lock is held when calling this function. |
| 832 | */ |
| 833 | int trace_ust_pid_tracker_lookup(struct ltt_ust_session *session, int pid) |
| 834 | { |
| 835 | struct lttng_ht_iter iter; |
| 836 | |
| 837 | if (!session->pid_tracker.ht) { |
| 838 | return 1; |
| 839 | } |
| 840 | if (pid_tracker_lookup(&session->pid_tracker, pid, &iter)) { |
| 841 | return 1; |
| 842 | } |
| 843 | return 0; |
| 844 | } |
| 845 | |
| 846 | /* |
| 847 | * Called with the session lock held. |
| 848 | */ |
| 849 | int trace_ust_track_pid(struct ltt_ust_session *session, int pid) |
| 850 | { |
| 851 | int retval = LTTNG_OK; |
| 852 | bool should_update_apps = false; |
| 853 | |
| 854 | if (pid == -1) { |
| 855 | /* Track all pids: destroy tracker if exists. */ |
| 856 | if (session->pid_tracker.ht) { |
| 857 | fini_pid_tracker(&session->pid_tracker); |
| 858 | /* Ensure all apps have session. */ |
| 859 | should_update_apps = true; |
| 860 | } |
| 861 | } else { |
| 862 | int ret; |
| 863 | |
| 864 | if (!session->pid_tracker.ht) { |
| 865 | /* Create tracker. */ |
| 866 | if (init_pid_tracker(&session->pid_tracker)) { |
| 867 | ERR("Error initializing PID tracker"); |
| 868 | retval = LTTNG_ERR_NOMEM; |
| 869 | goto end; |
| 870 | } |
| 871 | ret = pid_tracker_add_pid(&session->pid_tracker, pid); |
| 872 | if (ret != LTTNG_OK) { |
| 873 | retval = ret; |
| 874 | fini_pid_tracker(&session->pid_tracker); |
| 875 | goto end; |
| 876 | } |
| 877 | /* Remove all apps from session except pid. */ |
| 878 | should_update_apps = true; |
| 879 | } else { |
| 880 | struct ust_app *app; |
| 881 | |
| 882 | ret = pid_tracker_add_pid(&session->pid_tracker, pid); |
| 883 | if (ret != LTTNG_OK) { |
| 884 | retval = ret; |
| 885 | goto end; |
| 886 | } |
| 887 | /* Add session to application */ |
| 888 | app = ust_app_find_by_pid(pid); |
| 889 | if (app) { |
| 890 | should_update_apps = true; |
| 891 | } |
| 892 | } |
| 893 | } |
| 894 | if (should_update_apps && session->active) { |
| 895 | ust_app_global_update_all(session); |
| 896 | } |
| 897 | end: |
| 898 | return retval; |
| 899 | } |
| 900 | |
| 901 | /* |
| 902 | * Called with the session lock held. |
| 903 | */ |
| 904 | int trace_ust_untrack_pid(struct ltt_ust_session *session, int pid) |
| 905 | { |
| 906 | int retval = LTTNG_OK; |
| 907 | |
| 908 | if (pid == -1) { |
| 909 | /* Create empty tracker, replace old tracker. */ |
| 910 | struct ust_pid_tracker tmp_tracker; |
| 911 | |
| 912 | tmp_tracker = session->pid_tracker; |
| 913 | if (init_pid_tracker(&session->pid_tracker)) { |
| 914 | ERR("Error initializing PID tracker"); |
| 915 | retval = LTTNG_ERR_NOMEM; |
| 916 | /* Rollback operation. */ |
| 917 | session->pid_tracker = tmp_tracker; |
| 918 | goto end; |
| 919 | } |
| 920 | fini_pid_tracker(&tmp_tracker); |
| 921 | |
| 922 | /* Remove session from all applications */ |
| 923 | ust_app_global_update_all(session); |
| 924 | } else { |
| 925 | int ret; |
| 926 | struct ust_app *app; |
| 927 | |
| 928 | if (!session->pid_tracker.ht) { |
| 929 | /* No PID being tracked. */ |
| 930 | retval = LTTNG_ERR_PID_NOT_TRACKED; |
| 931 | goto end; |
| 932 | } |
| 933 | /* Remove PID from tracker */ |
| 934 | ret = pid_tracker_del_pid(&session->pid_tracker, pid); |
| 935 | if (ret != LTTNG_OK) { |
| 936 | retval = ret; |
| 937 | goto end; |
| 938 | } |
| 939 | /* Remove session from application. */ |
| 940 | app = ust_app_find_by_pid(pid); |
| 941 | if (app) { |
| 942 | ust_app_global_update(session, app); |
| 943 | } |
| 944 | } |
| 945 | end: |
| 946 | return retval; |
| 947 | } |
| 948 | |
| 949 | /* |
| 950 | * Called with session lock held. |
| 951 | */ |
| 952 | ssize_t trace_ust_list_tracker_pids(struct ltt_ust_session *session, |
| 953 | int32_t **_pids) |
| 954 | { |
| 955 | struct ust_pid_tracker_node *tracker_node; |
| 956 | struct lttng_ht_iter iter; |
| 957 | unsigned long count, i = 0; |
| 958 | long approx[2]; |
| 959 | int32_t *pids; |
| 960 | int ret = 0; |
| 961 | |
| 962 | if (!session->pid_tracker.ht) { |
| 963 | /* Tracker disabled. Set first entry to -1. */ |
| 964 | pids = zmalloc(sizeof(*pids)); |
| 965 | if (!pids) { |
| 966 | ret = -1; |
| 967 | goto end; |
| 968 | } |
| 969 | pids[0] = -1; |
| 970 | *_pids = pids; |
| 971 | return 1; |
| 972 | } |
| 973 | |
| 974 | rcu_read_lock(); |
| 975 | cds_lfht_count_nodes(session->pid_tracker.ht->ht, |
| 976 | &approx[0], &count, &approx[1]); |
| 977 | pids = zmalloc(sizeof(*pids) * count); |
| 978 | if (!pids) { |
| 979 | ret = -1; |
| 980 | goto end; |
| 981 | } |
| 982 | cds_lfht_for_each_entry(session->pid_tracker.ht->ht, |
| 983 | &iter.iter, tracker_node, node.node) { |
| 984 | pids[i++] = tracker_node->node.key; |
| 985 | } |
| 986 | *_pids = pids; |
| 987 | ret = count; |
| 988 | end: |
| 989 | rcu_read_unlock(); |
| 990 | return ret; |
| 991 | } |
| 992 | |
| 993 | /* |
| 994 | * RCU safe free context structure. |
| 995 | */ |
| 996 | static void destroy_context_rcu(struct rcu_head *head) |
| 997 | { |
| 998 | struct lttng_ht_node_ulong *node = |
| 999 | caa_container_of(head, struct lttng_ht_node_ulong, head); |
| 1000 | struct ltt_ust_context *ctx = |
| 1001 | caa_container_of(node, struct ltt_ust_context, node); |
| 1002 | |
| 1003 | trace_ust_destroy_context(ctx); |
| 1004 | } |
| 1005 | |
| 1006 | /* |
| 1007 | * Cleanup UST context hash table. |
| 1008 | */ |
| 1009 | static void destroy_contexts(struct lttng_ht *ht) |
| 1010 | { |
| 1011 | int ret; |
| 1012 | struct lttng_ht_node_ulong *node; |
| 1013 | struct lttng_ht_iter iter; |
| 1014 | struct ltt_ust_context *ctx; |
| 1015 | |
| 1016 | assert(ht); |
| 1017 | |
| 1018 | rcu_read_lock(); |
| 1019 | cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) { |
| 1020 | /* Remove from ordered list. */ |
| 1021 | ctx = caa_container_of(node, struct ltt_ust_context, node); |
| 1022 | cds_list_del(&ctx->list); |
| 1023 | /* Remove from channel's hash table. */ |
| 1024 | ret = lttng_ht_del(ht, &iter); |
| 1025 | if (!ret) { |
| 1026 | call_rcu(&node->head, destroy_context_rcu); |
| 1027 | } |
| 1028 | } |
| 1029 | rcu_read_unlock(); |
| 1030 | |
| 1031 | ht_cleanup_push(ht); |
| 1032 | } |
| 1033 | |
| 1034 | /* |
| 1035 | * Cleanup ust event structure. |
| 1036 | */ |
| 1037 | void trace_ust_destroy_event(struct ltt_ust_event *event) |
| 1038 | { |
| 1039 | assert(event); |
| 1040 | |
| 1041 | DBG2("Trace destroy UST event %s", event->attr.name); |
| 1042 | free(event->filter_expression); |
| 1043 | free(event->filter); |
| 1044 | free(event->exclusion); |
| 1045 | free(event); |
| 1046 | } |
| 1047 | |
| 1048 | /* |
| 1049 | * Cleanup ust context structure. |
| 1050 | */ |
| 1051 | void trace_ust_destroy_context(struct ltt_ust_context *ctx) |
| 1052 | { |
| 1053 | assert(ctx); |
| 1054 | |
| 1055 | if (ctx->ctx.ctx == LTTNG_UST_CONTEXT_APP_CONTEXT) { |
| 1056 | free(ctx->ctx.u.app_ctx.provider_name); |
| 1057 | free(ctx->ctx.u.app_ctx.ctx_name); |
| 1058 | } |
| 1059 | free(ctx); |
| 1060 | } |
| 1061 | |
| 1062 | /* |
| 1063 | * URCU intermediate call to complete destroy event. |
| 1064 | */ |
| 1065 | static void destroy_event_rcu(struct rcu_head *head) |
| 1066 | { |
| 1067 | struct lttng_ht_node_str *node = |
| 1068 | caa_container_of(head, struct lttng_ht_node_str, head); |
| 1069 | struct ltt_ust_event *event = |
| 1070 | caa_container_of(node, struct ltt_ust_event, node); |
| 1071 | |
| 1072 | trace_ust_destroy_event(event); |
| 1073 | } |
| 1074 | |
| 1075 | /* |
| 1076 | * Cleanup UST events hashtable. |
| 1077 | */ |
| 1078 | static void destroy_events(struct lttng_ht *events) |
| 1079 | { |
| 1080 | int ret; |
| 1081 | struct lttng_ht_node_str *node; |
| 1082 | struct lttng_ht_iter iter; |
| 1083 | |
| 1084 | assert(events); |
| 1085 | |
| 1086 | rcu_read_lock(); |
| 1087 | cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) { |
| 1088 | ret = lttng_ht_del(events, &iter); |
| 1089 | assert(!ret); |
| 1090 | call_rcu(&node->head, destroy_event_rcu); |
| 1091 | } |
| 1092 | rcu_read_unlock(); |
| 1093 | |
| 1094 | ht_cleanup_push(events); |
| 1095 | } |
| 1096 | |
| 1097 | /* |
| 1098 | * Cleanup ust channel structure. |
| 1099 | * |
| 1100 | * Should _NOT_ be called with RCU read lock held. |
| 1101 | */ |
| 1102 | static void _trace_ust_destroy_channel(struct ltt_ust_channel *channel) |
| 1103 | { |
| 1104 | assert(channel); |
| 1105 | |
| 1106 | DBG2("Trace destroy UST channel %s", channel->name); |
| 1107 | |
| 1108 | free(channel); |
| 1109 | } |
| 1110 | |
| 1111 | /* |
| 1112 | * URCU intermediate call to complete destroy channel. |
| 1113 | */ |
| 1114 | static void destroy_channel_rcu(struct rcu_head *head) |
| 1115 | { |
| 1116 | struct lttng_ht_node_str *node = |
| 1117 | caa_container_of(head, struct lttng_ht_node_str, head); |
| 1118 | struct ltt_ust_channel *channel = |
| 1119 | caa_container_of(node, struct ltt_ust_channel, node); |
| 1120 | |
| 1121 | _trace_ust_destroy_channel(channel); |
| 1122 | } |
| 1123 | |
| 1124 | void trace_ust_destroy_channel(struct ltt_ust_channel *channel) |
| 1125 | { |
| 1126 | /* Destroying all events of the channel */ |
| 1127 | destroy_events(channel->events); |
| 1128 | /* Destroying all context of the channel */ |
| 1129 | destroy_contexts(channel->ctx); |
| 1130 | |
| 1131 | call_rcu(&channel->node.head, destroy_channel_rcu); |
| 1132 | } |
| 1133 | |
| 1134 | /* |
| 1135 | * Remove an UST channel from a channel HT. |
| 1136 | */ |
| 1137 | void trace_ust_delete_channel(struct lttng_ht *ht, |
| 1138 | struct ltt_ust_channel *channel) |
| 1139 | { |
| 1140 | int ret; |
| 1141 | struct lttng_ht_iter iter; |
| 1142 | |
| 1143 | assert(ht); |
| 1144 | assert(channel); |
| 1145 | |
| 1146 | iter.iter.node = &channel->node.node; |
| 1147 | ret = lttng_ht_del(ht, &iter); |
| 1148 | assert(!ret); |
| 1149 | } |
| 1150 | |
| 1151 | /* |
| 1152 | * Iterate over a hash table containing channels and cleanup safely. |
| 1153 | */ |
| 1154 | static void destroy_channels(struct lttng_ht *channels) |
| 1155 | { |
| 1156 | struct lttng_ht_node_str *node; |
| 1157 | struct lttng_ht_iter iter; |
| 1158 | |
| 1159 | assert(channels); |
| 1160 | |
| 1161 | rcu_read_lock(); |
| 1162 | cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) { |
| 1163 | struct ltt_ust_channel *chan = |
| 1164 | caa_container_of(node, struct ltt_ust_channel, node); |
| 1165 | |
| 1166 | trace_ust_delete_channel(channels, chan); |
| 1167 | trace_ust_destroy_channel(chan); |
| 1168 | } |
| 1169 | rcu_read_unlock(); |
| 1170 | |
| 1171 | ht_cleanup_push(channels); |
| 1172 | } |
| 1173 | |
| 1174 | /* |
| 1175 | * Cleanup UST global domain. |
| 1176 | */ |
| 1177 | static void destroy_domain_global(struct ltt_ust_domain_global *dom) |
| 1178 | { |
| 1179 | assert(dom); |
| 1180 | |
| 1181 | destroy_channels(dom->channels); |
| 1182 | } |
| 1183 | |
| 1184 | /* |
| 1185 | * Cleanup ust session structure, keeping data required by |
| 1186 | * destroy notifier. |
| 1187 | * |
| 1188 | * Should *NOT* be called with RCU read-side lock held. |
| 1189 | */ |
| 1190 | void trace_ust_destroy_session(struct ltt_ust_session *session) |
| 1191 | { |
| 1192 | struct agent *agt; |
| 1193 | struct buffer_reg_uid *reg, *sreg; |
| 1194 | struct lttng_ht_iter iter; |
| 1195 | |
| 1196 | assert(session); |
| 1197 | |
| 1198 | DBG2("Trace UST destroy session %" PRIu64, session->id); |
| 1199 | |
| 1200 | /* Cleaning up UST domain */ |
| 1201 | destroy_domain_global(&session->domain_global); |
| 1202 | |
| 1203 | rcu_read_lock(); |
| 1204 | cds_lfht_for_each_entry(session->agents->ht, &iter.iter, agt, node.node) { |
| 1205 | int ret = lttng_ht_del(session->agents, &iter); |
| 1206 | |
| 1207 | assert(!ret); |
| 1208 | agent_destroy(agt); |
| 1209 | } |
| 1210 | rcu_read_unlock(); |
| 1211 | |
| 1212 | ht_cleanup_push(session->agents); |
| 1213 | |
| 1214 | /* Cleanup UID buffer registry object(s). */ |
| 1215 | cds_list_for_each_entry_safe(reg, sreg, &session->buffer_reg_uid_list, |
| 1216 | lnode) { |
| 1217 | cds_list_del(®->lnode); |
| 1218 | buffer_reg_uid_remove(reg); |
| 1219 | buffer_reg_uid_destroy(reg, session->consumer); |
| 1220 | } |
| 1221 | |
| 1222 | fini_pid_tracker(&session->pid_tracker); |
| 1223 | lttng_trace_chunk_put(session->current_trace_chunk); |
| 1224 | } |
| 1225 | |
| 1226 | /* Free elements needed by destroy notifiers. */ |
| 1227 | void trace_ust_free_session(struct ltt_ust_session *session) |
| 1228 | { |
| 1229 | consumer_output_put(session->consumer); |
| 1230 | free(session); |
| 1231 | } |