| 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 <errno.h> |
| 21 | #include <urcu/list.h> |
| 22 | #include <string.h> |
| 23 | |
| 24 | #include <lttng/lttng.h> |
| 25 | #include <common/error.h> |
| 26 | #include <common/sessiond-comm/sessiond-comm.h> |
| 27 | #include <common/filter.h> |
| 28 | #include <common/context.h> |
| 29 | |
| 30 | #include "channel.h" |
| 31 | #include "event.h" |
| 32 | #include "kernel.h" |
| 33 | #include "lttng-sessiond.h" |
| 34 | #include "ust-ctl.h" |
| 35 | #include "ust-app.h" |
| 36 | #include "trace-kernel.h" |
| 37 | #include "trace-ust.h" |
| 38 | #include "agent.h" |
| 39 | |
| 40 | /* |
| 41 | * Add unique UST event based on the event name, filter bytecode and loglevel. |
| 42 | */ |
| 43 | static void add_unique_ust_event(struct lttng_ht *ht, |
| 44 | struct ltt_ust_event *event) |
| 45 | { |
| 46 | struct cds_lfht_node *node_ptr; |
| 47 | struct ltt_ust_ht_key key; |
| 48 | |
| 49 | assert(ht); |
| 50 | assert(ht->ht); |
| 51 | assert(event); |
| 52 | |
| 53 | key.name = event->attr.name; |
| 54 | key.filter = (struct lttng_filter_bytecode *) event->filter; |
| 55 | key.loglevel_type = event->attr.loglevel_type; |
| 56 | key.loglevel_value = event->attr.loglevel; |
| 57 | key.exclusion = event->exclusion; |
| 58 | |
| 59 | node_ptr = cds_lfht_add_unique(ht->ht, |
| 60 | ht->hash_fct(event->node.key, lttng_ht_seed), |
| 61 | trace_ust_ht_match_event, &key, &event->node.node); |
| 62 | assert(node_ptr == &event->node.node); |
| 63 | } |
| 64 | |
| 65 | /* |
| 66 | * Disable kernel tracepoint events for a channel from the kernel session of |
| 67 | * a specified event_name and event type. |
| 68 | * On type LTTNG_EVENT_ALL all events with event_name are disabled. |
| 69 | * If event_name is NULL all events of the specified type are disabled. |
| 70 | */ |
| 71 | int event_kernel_disable_event(struct ltt_kernel_channel *kchan, |
| 72 | char *event_name, enum lttng_event_type type) |
| 73 | { |
| 74 | int ret, error = 0, found = 0; |
| 75 | struct ltt_kernel_event *kevent; |
| 76 | |
| 77 | assert(kchan); |
| 78 | |
| 79 | /* For each event in the kernel session */ |
| 80 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { |
| 81 | if (type != LTTNG_EVENT_ALL && kevent->type != type) |
| 82 | continue; |
| 83 | if (event_name != NULL && strcmp(event_name, kevent->event->name)) { |
| 84 | continue; |
| 85 | } |
| 86 | found++; |
| 87 | ret = kernel_disable_event(kevent); |
| 88 | if (ret < 0) { |
| 89 | error = 1; |
| 90 | continue; |
| 91 | } |
| 92 | } |
| 93 | DBG("Disable kernel event: found %d events with name: %s and type: %d", |
| 94 | found, event_name ? event_name : "NULL", type); |
| 95 | |
| 96 | if (event_name != NULL && !found) { |
| 97 | ret = LTTNG_ERR_NO_EVENT; |
| 98 | } else { |
| 99 | ret = error ? LTTNG_ERR_KERN_DISABLE_FAIL : LTTNG_OK; |
| 100 | } |
| 101 | |
| 102 | return ret; |
| 103 | } |
| 104 | |
| 105 | /* |
| 106 | * Enable kernel tracepoint event for a channel from the kernel session. |
| 107 | * We own filter_expression and filter. |
| 108 | */ |
| 109 | int event_kernel_enable_event(struct ltt_kernel_channel *kchan, |
| 110 | struct lttng_event *event, char *filter_expression, |
| 111 | struct lttng_filter_bytecode *filter) |
| 112 | { |
| 113 | int ret; |
| 114 | struct ltt_kernel_event *kevent; |
| 115 | |
| 116 | assert(kchan); |
| 117 | assert(event); |
| 118 | |
| 119 | kevent = trace_kernel_find_event(event->name, kchan, |
| 120 | event->type, filter); |
| 121 | if (kevent == NULL) { |
| 122 | ret = kernel_create_event(event, kchan, |
| 123 | filter_expression, filter); |
| 124 | /* We have passed ownership */ |
| 125 | filter_expression = NULL; |
| 126 | filter = NULL; |
| 127 | if (ret < 0) { |
| 128 | switch (-ret) { |
| 129 | case EEXIST: |
| 130 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
| 131 | break; |
| 132 | case ENOSYS: |
| 133 | ret = LTTNG_ERR_KERN_EVENT_ENOSYS; |
| 134 | break; |
| 135 | default: |
| 136 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
| 137 | break; |
| 138 | } |
| 139 | goto end; |
| 140 | } |
| 141 | } else if (kevent->enabled == 0) { |
| 142 | ret = kernel_enable_event(kevent); |
| 143 | if (ret < 0) { |
| 144 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
| 145 | goto end; |
| 146 | } |
| 147 | } else { |
| 148 | /* At this point, the event is considered enabled */ |
| 149 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
| 150 | goto end; |
| 151 | } |
| 152 | |
| 153 | ret = LTTNG_OK; |
| 154 | end: |
| 155 | free(filter_expression); |
| 156 | free(filter); |
| 157 | return ret; |
| 158 | } |
| 159 | |
| 160 | /* |
| 161 | * ============================ |
| 162 | * UST : The Ultimate Frontier! |
| 163 | * ============================ |
| 164 | */ |
| 165 | |
| 166 | /* |
| 167 | * Enable UST tracepoint event for a channel from a UST session. |
| 168 | * We own filter_expression, filter, and exclusion. |
| 169 | */ |
| 170 | int event_ust_enable_tracepoint(struct ltt_ust_session *usess, |
| 171 | struct ltt_ust_channel *uchan, struct lttng_event *event, |
| 172 | char *filter_expression, |
| 173 | struct lttng_filter_bytecode *filter, |
| 174 | struct lttng_event_exclusion *exclusion, |
| 175 | bool internal_event) |
| 176 | { |
| 177 | int ret = LTTNG_OK, to_create = 0; |
| 178 | struct ltt_ust_event *uevent; |
| 179 | |
| 180 | assert(usess); |
| 181 | assert(uchan); |
| 182 | assert(event); |
| 183 | |
| 184 | rcu_read_lock(); |
| 185 | |
| 186 | uevent = trace_ust_find_event(uchan->events, event->name, filter, |
| 187 | event->loglevel_type, event->loglevel, exclusion); |
| 188 | if (!uevent) { |
| 189 | uevent = trace_ust_create_event(event, filter_expression, |
| 190 | filter, exclusion, internal_event); |
| 191 | /* We have passed ownership */ |
| 192 | filter_expression = NULL; |
| 193 | filter = NULL; |
| 194 | exclusion = NULL; |
| 195 | if (uevent == NULL) { |
| 196 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 197 | goto error; |
| 198 | } |
| 199 | |
| 200 | /* Valid to set it after the goto error since uevent is still NULL */ |
| 201 | to_create = 1; |
| 202 | } |
| 203 | |
| 204 | if (uevent->enabled) { |
| 205 | /* It's already enabled so everything is OK */ |
| 206 | ret = LTTNG_ERR_UST_EVENT_ENABLED; |
| 207 | goto end; |
| 208 | } |
| 209 | |
| 210 | uevent->enabled = 1; |
| 211 | |
| 212 | if (to_create) { |
| 213 | /* Create event on all UST registered apps for session */ |
| 214 | ret = ust_app_create_event_glb(usess, uchan, uevent); |
| 215 | } else { |
| 216 | /* Enable event on all UST registered apps for session */ |
| 217 | ret = ust_app_enable_event_glb(usess, uchan, uevent); |
| 218 | } |
| 219 | |
| 220 | if (ret < 0) { |
| 221 | if (ret == -LTTNG_UST_ERR_EXIST) { |
| 222 | ret = LTTNG_ERR_UST_EVENT_EXIST; |
| 223 | goto end; |
| 224 | } else { |
| 225 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 226 | goto error; |
| 227 | } |
| 228 | } |
| 229 | |
| 230 | if (to_create) { |
| 231 | /* Add ltt ust event to channel */ |
| 232 | add_unique_ust_event(uchan->events, uevent); |
| 233 | } |
| 234 | |
| 235 | DBG("Event UST %s %s in channel %s", uevent->attr.name, |
| 236 | to_create ? "created" : "enabled", uchan->name); |
| 237 | |
| 238 | ret = LTTNG_OK; |
| 239 | |
| 240 | end: |
| 241 | rcu_read_unlock(); |
| 242 | free(filter_expression); |
| 243 | free(filter); |
| 244 | free(exclusion); |
| 245 | return ret; |
| 246 | |
| 247 | error: |
| 248 | /* |
| 249 | * Only destroy event on creation time (not enabling time) because if the |
| 250 | * event is found in the channel (to_create == 0), it means that at some |
| 251 | * point the enable_event worked and it's thus valid to keep it alive. |
| 252 | * Destroying it also implies that we also destroy it's shadow copy to sync |
| 253 | * everyone up. |
| 254 | */ |
| 255 | if (to_create) { |
| 256 | /* In this code path, the uevent was not added to the hash table */ |
| 257 | trace_ust_destroy_event(uevent); |
| 258 | } |
| 259 | rcu_read_unlock(); |
| 260 | free(filter_expression); |
| 261 | free(filter); |
| 262 | free(exclusion); |
| 263 | return ret; |
| 264 | } |
| 265 | |
| 266 | /* |
| 267 | * Disable UST tracepoint of a channel from a UST session. |
| 268 | */ |
| 269 | int event_ust_disable_tracepoint(struct ltt_ust_session *usess, |
| 270 | struct ltt_ust_channel *uchan, char *event_name) |
| 271 | { |
| 272 | int ret; |
| 273 | struct ltt_ust_event *uevent; |
| 274 | struct lttng_ht_node_str *node; |
| 275 | struct lttng_ht_iter iter; |
| 276 | struct lttng_ht *ht; |
| 277 | |
| 278 | assert(usess); |
| 279 | assert(uchan); |
| 280 | assert(event_name); |
| 281 | |
| 282 | ht = uchan->events; |
| 283 | |
| 284 | rcu_read_lock(); |
| 285 | |
| 286 | /* |
| 287 | * We use a custom lookup since we need the iterator for the next_duplicate |
| 288 | * call in the do while loop below. |
| 289 | */ |
| 290 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) event_name, lttng_ht_seed), |
| 291 | trace_ust_ht_match_event_by_name, event_name, &iter.iter); |
| 292 | node = lttng_ht_iter_get_node_str(&iter); |
| 293 | if (node == NULL) { |
| 294 | DBG2("Trace UST event NOT found by name %s", event_name); |
| 295 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 296 | goto error; |
| 297 | } |
| 298 | |
| 299 | do { |
| 300 | uevent = caa_container_of(node, struct ltt_ust_event, node); |
| 301 | assert(uevent); |
| 302 | |
| 303 | if (uevent->enabled == 0) { |
| 304 | /* It's already disabled so everything is OK */ |
| 305 | goto next; |
| 306 | } |
| 307 | |
| 308 | ret = ust_app_disable_event_glb(usess, uchan, uevent); |
| 309 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
| 310 | ret = LTTNG_ERR_UST_DISABLE_FAIL; |
| 311 | goto error; |
| 312 | } |
| 313 | uevent->enabled = 0; |
| 314 | |
| 315 | DBG2("Event UST %s disabled in channel %s", uevent->attr.name, |
| 316 | uchan->name); |
| 317 | |
| 318 | next: |
| 319 | /* Get next duplicate event by name. */ |
| 320 | cds_lfht_next_duplicate(ht->ht, trace_ust_ht_match_event_by_name, |
| 321 | event_name, &iter.iter); |
| 322 | node = lttng_ht_iter_get_node_str(&iter); |
| 323 | } while (node); |
| 324 | |
| 325 | ret = LTTNG_OK; |
| 326 | |
| 327 | error: |
| 328 | rcu_read_unlock(); |
| 329 | return ret; |
| 330 | } |
| 331 | |
| 332 | /* |
| 333 | * Disable all UST tracepoints for a channel from a UST session. |
| 334 | */ |
| 335 | int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess, |
| 336 | struct ltt_ust_channel *uchan) |
| 337 | { |
| 338 | int ret, i, size, error = 0; |
| 339 | struct lttng_ht_iter iter; |
| 340 | struct ltt_ust_event *uevent = NULL; |
| 341 | struct lttng_event *events = NULL; |
| 342 | |
| 343 | assert(usess); |
| 344 | assert(uchan); |
| 345 | |
| 346 | rcu_read_lock(); |
| 347 | |
| 348 | /* Disabling existing events */ |
| 349 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, |
| 350 | node.node) { |
| 351 | if (uevent->enabled == 1) { |
| 352 | ret = event_ust_disable_tracepoint(usess, uchan, |
| 353 | uevent->attr.name); |
| 354 | if (ret < 0) { |
| 355 | error = LTTNG_ERR_UST_DISABLE_FAIL; |
| 356 | continue; |
| 357 | } |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | /* Get all UST available events */ |
| 362 | size = ust_app_list_events(&events); |
| 363 | if (size < 0) { |
| 364 | ret = LTTNG_ERR_UST_LIST_FAIL; |
| 365 | goto error; |
| 366 | } |
| 367 | |
| 368 | for (i = 0; i < size; i++) { |
| 369 | ret = event_ust_disable_tracepoint(usess, uchan, |
| 370 | events[i].name); |
| 371 | if (ret < 0) { |
| 372 | /* Continue to disable the rest... */ |
| 373 | error = LTTNG_ERR_UST_DISABLE_FAIL; |
| 374 | continue; |
| 375 | } |
| 376 | } |
| 377 | |
| 378 | ret = error ? error : LTTNG_OK; |
| 379 | error: |
| 380 | rcu_read_unlock(); |
| 381 | free(events); |
| 382 | return ret; |
| 383 | } |
| 384 | |
| 385 | /* |
| 386 | * Enable all agent event for a given UST session. |
| 387 | * |
| 388 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 389 | */ |
| 390 | int event_agent_enable_all(struct ltt_ust_session *usess, |
| 391 | struct agent *agt, struct lttng_event *event, |
| 392 | struct lttng_filter_bytecode *filter ,char *filter_expression) |
| 393 | { |
| 394 | int ret; |
| 395 | struct agent_event *aevent; |
| 396 | struct lttng_ht_iter iter; |
| 397 | |
| 398 | assert(usess); |
| 399 | |
| 400 | DBG("Event agent enabling ALL events for session %" PRIu64, usess->id); |
| 401 | |
| 402 | /* Enable event on agent application through TCP socket. */ |
| 403 | ret = event_agent_enable(usess, agt, event, filter, filter_expression); |
| 404 | if (ret != LTTNG_OK) { |
| 405 | goto error; |
| 406 | } |
| 407 | |
| 408 | /* Flag every event that they are now enabled. */ |
| 409 | rcu_read_lock(); |
| 410 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent, |
| 411 | node.node) { |
| 412 | aevent->enabled = 1; |
| 413 | } |
| 414 | rcu_read_unlock(); |
| 415 | |
| 416 | ret = LTTNG_OK; |
| 417 | |
| 418 | error: |
| 419 | return ret; |
| 420 | } |
| 421 | |
| 422 | /* |
| 423 | * Check if this event's filter requires the activation of application contexts |
| 424 | * and enable them in the agent. |
| 425 | */ |
| 426 | static int add_filter_app_ctx(struct lttng_filter_bytecode *bytecode, |
| 427 | const char *filter_expression, struct agent *agt) |
| 428 | { |
| 429 | int ret = LTTNG_OK; |
| 430 | char *provider_name = NULL, *ctx_name = NULL; |
| 431 | struct bytecode_symbol_iterator *it = |
| 432 | bytecode_symbol_iterator_create(bytecode); |
| 433 | |
| 434 | if (!it) { |
| 435 | ret = LTTNG_ERR_NOMEM; |
| 436 | goto end; |
| 437 | } |
| 438 | |
| 439 | do { |
| 440 | struct lttng_event_context ctx; |
| 441 | const char *symbol_name = |
| 442 | bytecode_symbol_iterator_get_name(it); |
| 443 | |
| 444 | if (parse_application_context(symbol_name, &provider_name, |
| 445 | &ctx_name)) { |
| 446 | /* Not an application context. */ |
| 447 | continue; |
| 448 | } |
| 449 | |
| 450 | ctx.ctx = LTTNG_EVENT_CONTEXT_APP_CONTEXT; |
| 451 | ctx.u.app_ctx.provider_name = provider_name; |
| 452 | ctx.u.app_ctx.ctx_name = ctx_name; |
| 453 | |
| 454 | /* Recognized an application context. */ |
| 455 | DBG("Enabling event with filter expression \"%s\" requires enabling the %s:%s application context.", |
| 456 | filter_expression, provider_name, ctx_name); |
| 457 | |
| 458 | ret = agent_add_context(&ctx, agt); |
| 459 | if (ret != LTTNG_OK) { |
| 460 | ERR("Failed to add application context %s:%s.", |
| 461 | provider_name, ctx_name); |
| 462 | goto end; |
| 463 | } |
| 464 | |
| 465 | ret = agent_enable_context(&ctx, agt->domain); |
| 466 | if (ret != LTTNG_OK) { |
| 467 | ERR("Failed to enable application context %s:%s.", |
| 468 | provider_name, ctx_name); |
| 469 | goto end; |
| 470 | } |
| 471 | |
| 472 | free(provider_name); |
| 473 | free(ctx_name); |
| 474 | provider_name = ctx_name = NULL; |
| 475 | } while (bytecode_symbol_iterator_next(it) == 0); |
| 476 | end: |
| 477 | free(provider_name); |
| 478 | free(ctx_name); |
| 479 | bytecode_symbol_iterator_destroy(it); |
| 480 | return ret; |
| 481 | } |
| 482 | |
| 483 | /* |
| 484 | * Enable a single agent event for a given UST session. |
| 485 | * |
| 486 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 487 | */ |
| 488 | int event_agent_enable(struct ltt_ust_session *usess, |
| 489 | struct agent *agt, struct lttng_event *event, |
| 490 | struct lttng_filter_bytecode *filter, |
| 491 | char *filter_expression) |
| 492 | { |
| 493 | int ret, created = 0; |
| 494 | struct agent_event *aevent; |
| 495 | |
| 496 | assert(usess); |
| 497 | assert(event); |
| 498 | assert(agt); |
| 499 | |
| 500 | DBG("Event agent enabling %s for session %" PRIu64 " with loglevel type %d " |
| 501 | ", loglevel %d and filter \"%s\"", event->name, |
| 502 | usess->id, event->loglevel_type, event->loglevel, |
| 503 | filter_expression ? filter_expression : "NULL"); |
| 504 | |
| 505 | aevent = agent_find_event(event->name, event->loglevel_type, |
| 506 | event->loglevel, filter_expression, agt); |
| 507 | if (!aevent) { |
| 508 | aevent = agent_create_event(event->name, event->loglevel_type, |
| 509 | event->loglevel, filter, |
| 510 | filter_expression); |
| 511 | if (!aevent) { |
| 512 | ret = LTTNG_ERR_NOMEM; |
| 513 | goto error; |
| 514 | } |
| 515 | filter = NULL; |
| 516 | filter_expression = NULL; |
| 517 | created = 1; |
| 518 | } |
| 519 | |
| 520 | /* Already enabled? */ |
| 521 | if (aevent->enabled) { |
| 522 | ret = LTTNG_OK; |
| 523 | goto end; |
| 524 | } |
| 525 | |
| 526 | if (created && filter) { |
| 527 | ret = add_filter_app_ctx(filter, filter_expression, agt); |
| 528 | if (ret != LTTNG_OK) { |
| 529 | goto error; |
| 530 | } |
| 531 | } |
| 532 | |
| 533 | ret = agent_enable_event(aevent, agt->domain); |
| 534 | if (ret != LTTNG_OK) { |
| 535 | goto error; |
| 536 | } |
| 537 | |
| 538 | /* If the event was created prior to the enable, add it to the domain. */ |
| 539 | if (created) { |
| 540 | agent_add_event(aevent, agt); |
| 541 | } |
| 542 | |
| 543 | ret = LTTNG_OK; |
| 544 | goto end; |
| 545 | |
| 546 | error: |
| 547 | if (created) { |
| 548 | agent_destroy_event(aevent); |
| 549 | } |
| 550 | end: |
| 551 | free(filter); |
| 552 | free(filter_expression); |
| 553 | return ret; |
| 554 | } |
| 555 | |
| 556 | /* |
| 557 | * Return the default event name associated with the provided UST domain. Return |
| 558 | * NULL on error. |
| 559 | */ |
| 560 | const char *event_get_default_agent_ust_name(enum lttng_domain_type domain) |
| 561 | { |
| 562 | const char *default_event_name = NULL; |
| 563 | |
| 564 | switch (domain) { |
| 565 | case LTTNG_DOMAIN_LOG4J: |
| 566 | default_event_name = DEFAULT_LOG4J_EVENT_NAME; |
| 567 | break; |
| 568 | case LTTNG_DOMAIN_JUL: |
| 569 | default_event_name = DEFAULT_JUL_EVENT_NAME; |
| 570 | break; |
| 571 | case LTTNG_DOMAIN_PYTHON: |
| 572 | default_event_name = DEFAULT_PYTHON_EVENT_NAME; |
| 573 | break; |
| 574 | default: |
| 575 | assert(0); |
| 576 | } |
| 577 | |
| 578 | return default_event_name; |
| 579 | } |
| 580 | |
| 581 | /* |
| 582 | * Disable a given agent event for a given UST session. |
| 583 | * |
| 584 | * Must be called with the RCU read lock held. |
| 585 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 586 | */ |
| 587 | static int event_agent_disable_one(struct ltt_ust_session *usess, |
| 588 | struct agent *agt, struct agent_event *aevent) |
| 589 | { |
| 590 | int ret; |
| 591 | struct ltt_ust_event *uevent = NULL; |
| 592 | struct ltt_ust_channel *uchan = NULL; |
| 593 | const char *ust_event_name, *ust_channel_name; |
| 594 | |
| 595 | assert(agt); |
| 596 | assert(usess); |
| 597 | assert(aevent); |
| 598 | |
| 599 | DBG("Event agent disabling %s (loglevel type %d, loglevel value %d) for session %" PRIu64, |
| 600 | aevent->name, aevent->loglevel_type, aevent->loglevel_value, |
| 601 | usess->id); |
| 602 | |
| 603 | /* Already disabled? */ |
| 604 | if (!aevent->enabled) { |
| 605 | goto end; |
| 606 | } |
| 607 | |
| 608 | if (agt->domain == LTTNG_DOMAIN_JUL) { |
| 609 | ust_channel_name = DEFAULT_JUL_CHANNEL_NAME; |
| 610 | } else if (agt->domain == LTTNG_DOMAIN_LOG4J) { |
| 611 | ust_channel_name = DEFAULT_LOG4J_CHANNEL_NAME; |
| 612 | } else if (agt->domain == LTTNG_DOMAIN_PYTHON) { |
| 613 | ust_channel_name = DEFAULT_PYTHON_CHANNEL_NAME; |
| 614 | } else { |
| 615 | ret = LTTNG_ERR_INVALID; |
| 616 | goto error; |
| 617 | } |
| 618 | |
| 619 | /* |
| 620 | * Disable it on the UST side. First get the channel reference then find |
| 621 | * the event and finally disable it. |
| 622 | */ |
| 623 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
| 624 | (char *) ust_channel_name); |
| 625 | if (!uchan) { |
| 626 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 627 | goto error; |
| 628 | } |
| 629 | |
| 630 | ust_event_name = event_get_default_agent_ust_name(agt->domain); |
| 631 | if (!ust_event_name) { |
| 632 | ret = LTTNG_ERR_FATAL; |
| 633 | goto error; |
| 634 | } |
| 635 | |
| 636 | /* |
| 637 | * Agent UST event has its loglevel type forced to |
| 638 | * LTTNG_UST_LOGLEVEL_ALL. The actual loglevel type/value filtering |
| 639 | * happens thanks to an UST filter. The following -1 is actually |
| 640 | * ignored since the type is LTTNG_UST_LOGLEVEL_ALL. |
| 641 | */ |
| 642 | uevent = trace_ust_find_event(uchan->events, (char *) ust_event_name, |
| 643 | aevent->filter, LTTNG_UST_LOGLEVEL_ALL, -1, NULL); |
| 644 | /* If the agent event exists, it must be available on the UST side. */ |
| 645 | assert(uevent); |
| 646 | |
| 647 | ret = ust_app_disable_event_glb(usess, uchan, uevent); |
| 648 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
| 649 | ret = LTTNG_ERR_UST_DISABLE_FAIL; |
| 650 | goto error; |
| 651 | } |
| 652 | |
| 653 | /* |
| 654 | * Flag event that it's disabled so the shadow copy on the ust app side |
| 655 | * will disable it if an application shows up. |
| 656 | */ |
| 657 | uevent->enabled = 0; |
| 658 | |
| 659 | ret = agent_disable_event(aevent, agt->domain); |
| 660 | if (ret != LTTNG_OK) { |
| 661 | goto error; |
| 662 | } |
| 663 | |
| 664 | end: |
| 665 | return LTTNG_OK; |
| 666 | |
| 667 | error: |
| 668 | return ret; |
| 669 | } |
| 670 | |
| 671 | /* |
| 672 | * Disable all agent events matching a given name for a given UST session. |
| 673 | * |
| 674 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 675 | */ |
| 676 | int event_agent_disable(struct ltt_ust_session *usess, struct agent *agt, |
| 677 | char *event_name) |
| 678 | { |
| 679 | int ret = LTTNG_OK; |
| 680 | struct agent_event *aevent; |
| 681 | struct lttng_ht_iter iter; |
| 682 | struct lttng_ht_node_str *node; |
| 683 | |
| 684 | assert(agt); |
| 685 | assert(usess); |
| 686 | assert(event_name); |
| 687 | |
| 688 | DBG("Event agent disabling %s (all loglevels) for session %" PRIu64, event_name, usess->id); |
| 689 | |
| 690 | rcu_read_lock(); |
| 691 | agent_find_events_by_name(event_name, agt, &iter); |
| 692 | node = lttng_ht_iter_get_node_str(&iter); |
| 693 | |
| 694 | if (node == NULL) { |
| 695 | DBG2("Event agent NOT found by name %s", event_name); |
| 696 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 697 | goto end; |
| 698 | } |
| 699 | |
| 700 | do { |
| 701 | aevent = caa_container_of(node, struct agent_event, node); |
| 702 | ret = event_agent_disable_one(usess, agt, aevent); |
| 703 | |
| 704 | if (ret != LTTNG_OK) { |
| 705 | goto end; |
| 706 | } |
| 707 | |
| 708 | /* Get next duplicate agent event by name. */ |
| 709 | agent_event_next_duplicate(event_name, agt, &iter); |
| 710 | node = lttng_ht_iter_get_node_str(&iter); |
| 711 | } while (node); |
| 712 | end: |
| 713 | rcu_read_unlock(); |
| 714 | return ret; |
| 715 | } |
| 716 | /* |
| 717 | * Disable all agent event for a given UST session. |
| 718 | * |
| 719 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 720 | */ |
| 721 | int event_agent_disable_all(struct ltt_ust_session *usess, |
| 722 | struct agent *agt) |
| 723 | { |
| 724 | int ret; |
| 725 | struct agent_event *aevent; |
| 726 | struct lttng_ht_iter iter; |
| 727 | |
| 728 | assert(agt); |
| 729 | assert(usess); |
| 730 | |
| 731 | /* |
| 732 | * Disable event on agent application. Continue to disable all other events |
| 733 | * if the * event is not found. |
| 734 | */ |
| 735 | ret = event_agent_disable(usess, agt, "*"); |
| 736 | if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_NOT_FOUND) { |
| 737 | goto error; |
| 738 | } |
| 739 | |
| 740 | /* Disable every event. */ |
| 741 | rcu_read_lock(); |
| 742 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent, |
| 743 | node.node) { |
| 744 | if (!aevent->enabled) { |
| 745 | continue; |
| 746 | } |
| 747 | |
| 748 | ret = event_agent_disable(usess, agt, aevent->name); |
| 749 | if (ret != LTTNG_OK) { |
| 750 | goto error_unlock; |
| 751 | } |
| 752 | } |
| 753 | ret = LTTNG_OK; |
| 754 | |
| 755 | error_unlock: |
| 756 | rcu_read_unlock(); |
| 757 | error: |
| 758 | return ret; |
| 759 | } |