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