| 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 | |
| 37 | /* |
| 38 | * Add unique UST event based on the event name, filter bytecode and loglevel. |
| 39 | */ |
| 40 | static void add_unique_ust_event(struct lttng_ht *ht, |
| 41 | struct ltt_ust_event *event) |
| 42 | { |
| 43 | struct cds_lfht_node *node_ptr; |
| 44 | struct ltt_ust_ht_key key; |
| 45 | |
| 46 | assert(ht); |
| 47 | assert(ht->ht); |
| 48 | assert(event); |
| 49 | |
| 50 | key.name = event->attr.name; |
| 51 | key.filter = (struct lttng_filter_bytecode *) event->filter; |
| 52 | key.loglevel = event->attr.loglevel; |
| 53 | key.exclusion = event->exclusion; |
| 54 | |
| 55 | node_ptr = cds_lfht_add_unique(ht->ht, |
| 56 | ht->hash_fct(event->node.key, lttng_ht_seed), |
| 57 | trace_ust_ht_match_event, &key, &event->node.node); |
| 58 | assert(node_ptr == &event->node.node); |
| 59 | } |
| 60 | |
| 61 | /* |
| 62 | * Disable kernel tracepoint event for a channel from the kernel session. |
| 63 | */ |
| 64 | int event_kernel_disable_tracepoint(struct ltt_kernel_channel *kchan, |
| 65 | char *event_name) |
| 66 | { |
| 67 | int ret; |
| 68 | struct ltt_kernel_event *kevent; |
| 69 | |
| 70 | assert(kchan); |
| 71 | |
| 72 | kevent = trace_kernel_get_event_by_name(event_name, kchan); |
| 73 | if (kevent == NULL) { |
| 74 | ret = LTTNG_ERR_NO_EVENT; |
| 75 | goto error; |
| 76 | } |
| 77 | |
| 78 | ret = kernel_disable_event(kevent); |
| 79 | if (ret < 0) { |
| 80 | ret = LTTNG_ERR_KERN_DISABLE_FAIL; |
| 81 | goto error; |
| 82 | } |
| 83 | |
| 84 | DBG("Kernel event %s disable for channel %s.", |
| 85 | kevent->event->name, kchan->channel->name); |
| 86 | |
| 87 | ret = LTTNG_OK; |
| 88 | |
| 89 | error: |
| 90 | return ret; |
| 91 | } |
| 92 | |
| 93 | /* |
| 94 | * Enable kernel system call for a channel from the kernel session. |
| 95 | */ |
| 96 | int event_kernel_enable_syscall(struct ltt_kernel_channel *kchan, |
| 97 | char *syscall_name) |
| 98 | { |
| 99 | int ret; |
| 100 | |
| 101 | assert(kchan); |
| 102 | |
| 103 | ret = kernel_enable_syscall(syscall_name, kchan); |
| 104 | if (ret < 0) { |
| 105 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
| 106 | goto error; |
| 107 | } |
| 108 | |
| 109 | DBG("Kernel syscall %s enable for channel %s.", |
| 110 | syscall_name, kchan->channel->name); |
| 111 | |
| 112 | ret = LTTNG_OK; |
| 113 | |
| 114 | error: |
| 115 | return ret; |
| 116 | } |
| 117 | |
| 118 | /* |
| 119 | * Disable kernel system call for a channel from the kernel session. |
| 120 | */ |
| 121 | int event_kernel_disable_syscall(struct ltt_kernel_channel *kchan, |
| 122 | char *syscall_name) |
| 123 | { |
| 124 | int ret; |
| 125 | |
| 126 | assert(kchan); |
| 127 | |
| 128 | ret = kernel_disable_syscall(syscall_name, kchan); |
| 129 | if (ret < 0) { |
| 130 | ret = LTTNG_ERR_KERN_DISABLE_FAIL; |
| 131 | goto error; |
| 132 | } |
| 133 | |
| 134 | DBG("Kernel syscall %s disable for channel %s.", |
| 135 | !strcmp(syscall_name, "*") ? "<all>" : syscall_name, |
| 136 | kchan->channel->name); |
| 137 | |
| 138 | ret = LTTNG_OK; |
| 139 | |
| 140 | error: |
| 141 | return ret; |
| 142 | } |
| 143 | |
| 144 | /* |
| 145 | * Disable kernel tracepoint events for a channel from the kernel session. |
| 146 | */ |
| 147 | int event_kernel_disable_all_tracepoints(struct ltt_kernel_channel *kchan) |
| 148 | { |
| 149 | int ret; |
| 150 | struct ltt_kernel_event *kevent; |
| 151 | |
| 152 | assert(kchan); |
| 153 | |
| 154 | /* For each event in the kernel session */ |
| 155 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { |
| 156 | ret = kernel_disable_event(kevent); |
| 157 | if (ret < 0) { |
| 158 | /* We continue disabling the rest */ |
| 159 | continue; |
| 160 | } |
| 161 | } |
| 162 | ret = LTTNG_OK; |
| 163 | return ret; |
| 164 | } |
| 165 | |
| 166 | /* |
| 167 | * Disable all kernel event for a channel from the kernel session. |
| 168 | */ |
| 169 | int event_kernel_disable_all(struct ltt_kernel_channel *kchan) |
| 170 | { |
| 171 | int ret; |
| 172 | |
| 173 | assert(kchan); |
| 174 | |
| 175 | ret = event_kernel_disable_all_tracepoints(kchan); |
| 176 | if (ret != LTTNG_OK) |
| 177 | return ret; |
| 178 | ret = event_kernel_disable_syscall(kchan, "*"); |
| 179 | return ret; |
| 180 | } |
| 181 | |
| 182 | /* |
| 183 | * Enable kernel tracepoint event for a channel from the kernel session. |
| 184 | * We own filter_expression and filter. |
| 185 | */ |
| 186 | int event_kernel_enable_tracepoint(struct ltt_kernel_channel *kchan, |
| 187 | struct lttng_event *event) |
| 188 | { |
| 189 | int ret; |
| 190 | struct ltt_kernel_event *kevent; |
| 191 | |
| 192 | assert(kchan); |
| 193 | assert(event); |
| 194 | |
| 195 | kevent = trace_kernel_get_event_by_name(event->name, kchan); |
| 196 | if (kevent == NULL) { |
| 197 | ret = kernel_create_event(event, kchan); |
| 198 | if (ret < 0) { |
| 199 | switch (-ret) { |
| 200 | case EEXIST: |
| 201 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
| 202 | break; |
| 203 | case ENOSYS: |
| 204 | ret = LTTNG_ERR_KERN_EVENT_ENOSYS; |
| 205 | break; |
| 206 | default: |
| 207 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
| 208 | break; |
| 209 | } |
| 210 | goto end; |
| 211 | } |
| 212 | } else if (kevent->enabled == 0) { |
| 213 | ret = kernel_enable_event(kevent); |
| 214 | if (ret < 0) { |
| 215 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
| 216 | goto end; |
| 217 | } |
| 218 | } else { |
| 219 | /* At this point, the event is considered enabled */ |
| 220 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
| 221 | goto end; |
| 222 | } |
| 223 | |
| 224 | ret = LTTNG_OK; |
| 225 | end: |
| 226 | return ret; |
| 227 | } |
| 228 | |
| 229 | /* |
| 230 | * ============================ |
| 231 | * UST : The Ultimate Frontier! |
| 232 | * ============================ |
| 233 | */ |
| 234 | |
| 235 | /* |
| 236 | * Enable all UST tracepoints for a channel from a UST session. |
| 237 | */ |
| 238 | int event_ust_enable_all_tracepoints(struct ltt_ust_session *usess, |
| 239 | struct ltt_ust_channel *uchan, |
| 240 | char *filter_expression, |
| 241 | struct lttng_filter_bytecode *filter) |
| 242 | { |
| 243 | int ret, i, size; |
| 244 | struct lttng_ht_iter iter; |
| 245 | struct ltt_ust_event *uevent = NULL; |
| 246 | struct lttng_event *events = NULL; |
| 247 | |
| 248 | assert(usess); |
| 249 | assert(uchan); |
| 250 | |
| 251 | rcu_read_lock(); |
| 252 | |
| 253 | /* Enable existing events */ |
| 254 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, |
| 255 | node.node) { |
| 256 | if (uevent->enabled == 0) { |
| 257 | ret = ust_app_enable_event_glb(usess, uchan, uevent); |
| 258 | if (ret < 0) { |
| 259 | continue; |
| 260 | } |
| 261 | uevent->enabled = 1; |
| 262 | } |
| 263 | } |
| 264 | |
| 265 | /* Get all UST available events */ |
| 266 | size = ust_app_list_events(&events); |
| 267 | if (size < 0) { |
| 268 | ret = LTTNG_ERR_UST_LIST_FAIL; |
| 269 | goto error; |
| 270 | } |
| 271 | |
| 272 | for (i = 0; i < size; i++) { |
| 273 | /* |
| 274 | * Check if event exist and if so, continue since it was enable |
| 275 | * previously. |
| 276 | */ |
| 277 | uevent = trace_ust_find_event(uchan->events, events[i].name, filter, |
| 278 | events[i].loglevel, NULL); |
| 279 | if (uevent != NULL) { |
| 280 | ret = ust_app_enable_event_pid(usess, uchan, uevent, |
| 281 | events[i].pid); |
| 282 | if (ret < 0) { |
| 283 | if (ret != -LTTNG_UST_ERR_EXIST) { |
| 284 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 285 | goto error; |
| 286 | } |
| 287 | } |
| 288 | continue; |
| 289 | } |
| 290 | |
| 291 | /* Create ust event */ |
| 292 | uevent = trace_ust_create_event(&events[i], filter_expression, |
| 293 | filter, NULL); |
| 294 | if (uevent == NULL) { |
| 295 | ret = LTTNG_ERR_FATAL; |
| 296 | goto error_destroy; |
| 297 | } |
| 298 | |
| 299 | /* Create event for the specific PID */ |
| 300 | ret = ust_app_enable_event_pid(usess, uchan, uevent, |
| 301 | events[i].pid); |
| 302 | if (ret < 0) { |
| 303 | if (ret == -LTTNG_UST_ERR_EXIST) { |
| 304 | ret = LTTNG_ERR_UST_EVENT_EXIST; |
| 305 | goto error; |
| 306 | } else { |
| 307 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 308 | goto error_destroy; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | uevent->enabled = 1; |
| 313 | /* Add ltt ust event to channel */ |
| 314 | rcu_read_lock(); |
| 315 | add_unique_ust_event(uchan->events, uevent); |
| 316 | rcu_read_unlock(); |
| 317 | } |
| 318 | free(events); |
| 319 | |
| 320 | rcu_read_unlock(); |
| 321 | return LTTNG_OK; |
| 322 | |
| 323 | error_destroy: |
| 324 | trace_ust_destroy_event(uevent); |
| 325 | |
| 326 | error: |
| 327 | free(events); |
| 328 | rcu_read_unlock(); |
| 329 | return ret; |
| 330 | } |
| 331 | |
| 332 | /* |
| 333 | * Enable UST tracepoint event for a channel from a UST session. |
| 334 | * We own filter_expression, filter, and exclusion. |
| 335 | */ |
| 336 | int event_ust_enable_tracepoint(struct ltt_ust_session *usess, |
| 337 | struct ltt_ust_channel *uchan, struct lttng_event *event, |
| 338 | char *filter_expression, |
| 339 | struct lttng_filter_bytecode *filter, |
| 340 | struct lttng_event_exclusion *exclusion) |
| 341 | { |
| 342 | int ret = LTTNG_OK, to_create = 0; |
| 343 | struct ltt_ust_event *uevent; |
| 344 | |
| 345 | assert(usess); |
| 346 | assert(uchan); |
| 347 | assert(event); |
| 348 | |
| 349 | rcu_read_lock(); |
| 350 | |
| 351 | uevent = trace_ust_find_event(uchan->events, event->name, filter, |
| 352 | event->loglevel, exclusion); |
| 353 | if (uevent == NULL) { |
| 354 | uevent = trace_ust_create_event(event, filter_expression, |
| 355 | filter, exclusion); |
| 356 | /* We have passed ownership */ |
| 357 | filter_expression = NULL; |
| 358 | filter = NULL; |
| 359 | exclusion = NULL; |
| 360 | if (uevent == NULL) { |
| 361 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 362 | goto error; |
| 363 | } |
| 364 | |
| 365 | /* Valid to set it after the goto error since uevent is still NULL */ |
| 366 | to_create = 1; |
| 367 | } |
| 368 | |
| 369 | if (uevent->enabled) { |
| 370 | /* It's already enabled so everything is OK */ |
| 371 | ret = LTTNG_ERR_UST_EVENT_ENABLED; |
| 372 | goto end; |
| 373 | } |
| 374 | |
| 375 | uevent->enabled = 1; |
| 376 | |
| 377 | if (to_create) { |
| 378 | /* Create event on all UST registered apps for session */ |
| 379 | ret = ust_app_create_event_glb(usess, uchan, uevent); |
| 380 | } else { |
| 381 | /* Enable event on all UST registered apps for session */ |
| 382 | ret = ust_app_enable_event_glb(usess, uchan, uevent); |
| 383 | } |
| 384 | |
| 385 | if (ret < 0) { |
| 386 | if (ret == -LTTNG_UST_ERR_EXIST) { |
| 387 | ret = LTTNG_ERR_UST_EVENT_EXIST; |
| 388 | goto end; |
| 389 | } else { |
| 390 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 391 | goto error; |
| 392 | } |
| 393 | } |
| 394 | |
| 395 | if (to_create) { |
| 396 | /* Add ltt ust event to channel */ |
| 397 | add_unique_ust_event(uchan->events, uevent); |
| 398 | } |
| 399 | |
| 400 | DBG("Event UST %s %s in channel %s", uevent->attr.name, |
| 401 | to_create ? "created" : "enabled", uchan->name); |
| 402 | |
| 403 | ret = LTTNG_OK; |
| 404 | |
| 405 | end: |
| 406 | rcu_read_unlock(); |
| 407 | free(filter_expression); |
| 408 | free(filter); |
| 409 | free(exclusion); |
| 410 | return ret; |
| 411 | |
| 412 | error: |
| 413 | /* |
| 414 | * Only destroy event on creation time (not enabling time) because if the |
| 415 | * event is found in the channel (to_create == 0), it means that at some |
| 416 | * point the enable_event worked and it's thus valid to keep it alive. |
| 417 | * Destroying it also implies that we also destroy it's shadow copy to sync |
| 418 | * everyone up. |
| 419 | */ |
| 420 | if (to_create) { |
| 421 | /* In this code path, the uevent was not added to the hash table */ |
| 422 | trace_ust_destroy_event(uevent); |
| 423 | } |
| 424 | rcu_read_unlock(); |
| 425 | free(filter_expression); |
| 426 | free(filter); |
| 427 | free(exclusion); |
| 428 | return ret; |
| 429 | } |
| 430 | |
| 431 | /* |
| 432 | * Disable UST tracepoint of a channel from a UST session. |
| 433 | */ |
| 434 | int event_ust_disable_tracepoint(struct ltt_ust_session *usess, |
| 435 | struct ltt_ust_channel *uchan, char *event_name) |
| 436 | { |
| 437 | int ret; |
| 438 | struct ltt_ust_event *uevent; |
| 439 | struct lttng_ht_node_str *node; |
| 440 | struct lttng_ht_iter iter; |
| 441 | struct lttng_ht *ht; |
| 442 | |
| 443 | assert(usess); |
| 444 | assert(uchan); |
| 445 | assert(event_name); |
| 446 | |
| 447 | ht = uchan->events; |
| 448 | |
| 449 | rcu_read_lock(); |
| 450 | |
| 451 | /* |
| 452 | * We use a custom lookup since we need the iterator for the next_duplicate |
| 453 | * call in the do while loop below. |
| 454 | */ |
| 455 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) event_name, lttng_ht_seed), |
| 456 | trace_ust_ht_match_event_by_name, event_name, &iter.iter); |
| 457 | node = lttng_ht_iter_get_node_str(&iter); |
| 458 | if (node == NULL) { |
| 459 | DBG2("Trace UST event NOT found by name %s", event_name); |
| 460 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 461 | goto error; |
| 462 | } |
| 463 | |
| 464 | do { |
| 465 | uevent = caa_container_of(node, struct ltt_ust_event, node); |
| 466 | assert(uevent); |
| 467 | |
| 468 | if (uevent->enabled == 0) { |
| 469 | /* It's already disabled so everything is OK */ |
| 470 | goto next; |
| 471 | } |
| 472 | |
| 473 | ret = ust_app_disable_event_glb(usess, uchan, uevent); |
| 474 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
| 475 | ret = LTTNG_ERR_UST_DISABLE_FAIL; |
| 476 | goto error; |
| 477 | } |
| 478 | uevent->enabled = 0; |
| 479 | |
| 480 | DBG2("Event UST %s disabled in channel %s", uevent->attr.name, |
| 481 | uchan->name); |
| 482 | |
| 483 | next: |
| 484 | /* Get next duplicate event by name. */ |
| 485 | cds_lfht_next_duplicate(ht->ht, trace_ust_ht_match_event_by_name, |
| 486 | event_name, &iter.iter); |
| 487 | node = lttng_ht_iter_get_node_str(&iter); |
| 488 | } while (node); |
| 489 | |
| 490 | ret = LTTNG_OK; |
| 491 | |
| 492 | error: |
| 493 | rcu_read_unlock(); |
| 494 | return ret; |
| 495 | } |
| 496 | |
| 497 | /* |
| 498 | * Disable all UST tracepoints for a channel from a UST session. |
| 499 | */ |
| 500 | int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess, |
| 501 | struct ltt_ust_channel *uchan) |
| 502 | { |
| 503 | int ret, i, size; |
| 504 | struct lttng_ht_iter iter; |
| 505 | struct ltt_ust_event *uevent = NULL; |
| 506 | struct lttng_event *events = NULL; |
| 507 | |
| 508 | assert(usess); |
| 509 | assert(uchan); |
| 510 | |
| 511 | rcu_read_lock(); |
| 512 | |
| 513 | /* Disabling existing events */ |
| 514 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, |
| 515 | node.node) { |
| 516 | if (uevent->enabled == 1) { |
| 517 | ret = event_ust_disable_tracepoint(usess, uchan, |
| 518 | uevent->attr.name); |
| 519 | if (ret < 0) { |
| 520 | continue; |
| 521 | } |
| 522 | } |
| 523 | } |
| 524 | |
| 525 | /* Get all UST available events */ |
| 526 | size = ust_app_list_events(&events); |
| 527 | if (size < 0) { |
| 528 | ret = LTTNG_ERR_UST_LIST_FAIL; |
| 529 | goto error; |
| 530 | } |
| 531 | |
| 532 | for (i = 0; i < size; i++) { |
| 533 | ret = event_ust_disable_tracepoint(usess, uchan, |
| 534 | events[i].name); |
| 535 | if (ret != LTTNG_OK) { |
| 536 | /* Continue to disable the rest... */ |
| 537 | continue; |
| 538 | } |
| 539 | } |
| 540 | free(events); |
| 541 | |
| 542 | rcu_read_unlock(); |
| 543 | return LTTNG_OK; |
| 544 | |
| 545 | error: |
| 546 | free(events); |
| 547 | rcu_read_unlock(); |
| 548 | return ret; |
| 549 | } |
| 550 | |
| 551 | /* |
| 552 | * Enable all agent event for a given UST session. |
| 553 | * |
| 554 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 555 | */ |
| 556 | int event_agent_enable_all(struct ltt_ust_session *usess, |
| 557 | struct agent *agt, struct lttng_event *event, |
| 558 | struct lttng_filter_bytecode *filter) |
| 559 | { |
| 560 | int ret; |
| 561 | struct agent_event *aevent; |
| 562 | struct lttng_ht_iter iter; |
| 563 | |
| 564 | assert(usess); |
| 565 | |
| 566 | DBG("Event agent enabling ALL events for session %" PRIu64, usess->id); |
| 567 | |
| 568 | /* Enable event on agent application through TCP socket. */ |
| 569 | ret = event_agent_enable(usess, agt, event, filter); |
| 570 | if (ret != LTTNG_OK) { |
| 571 | goto error; |
| 572 | } |
| 573 | |
| 574 | /* Flag every event that they are now enabled. */ |
| 575 | rcu_read_lock(); |
| 576 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent, |
| 577 | node.node) { |
| 578 | aevent->enabled = 1; |
| 579 | } |
| 580 | rcu_read_unlock(); |
| 581 | |
| 582 | ret = LTTNG_OK; |
| 583 | |
| 584 | error: |
| 585 | return ret; |
| 586 | } |
| 587 | |
| 588 | /* |
| 589 | * Enable a single agent event for a given UST session. |
| 590 | * |
| 591 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 592 | */ |
| 593 | int event_agent_enable(struct ltt_ust_session *usess, |
| 594 | struct agent *agt, struct lttng_event *event, |
| 595 | struct lttng_filter_bytecode *filter) |
| 596 | { |
| 597 | int ret, created = 0; |
| 598 | struct agent_event *aevent; |
| 599 | |
| 600 | assert(usess); |
| 601 | assert(event); |
| 602 | assert(agt); |
| 603 | |
| 604 | DBG("Event agent enabling %s for session %" PRIu64 " with loglevel type %d " |
| 605 | "and loglevel %d", event->name, usess->id, event->loglevel_type, |
| 606 | event->loglevel); |
| 607 | |
| 608 | aevent = agent_find_event(event->name, event->loglevel, agt); |
| 609 | if (!aevent) { |
| 610 | aevent = agent_create_event(event->name, filter); |
| 611 | if (!aevent) { |
| 612 | ret = LTTNG_ERR_NOMEM; |
| 613 | goto error; |
| 614 | } |
| 615 | aevent->loglevel = event->loglevel; |
| 616 | aevent->loglevel_type = event->loglevel_type; |
| 617 | created = 1; |
| 618 | } |
| 619 | |
| 620 | /* Already enabled? */ |
| 621 | if (aevent->enabled) { |
| 622 | goto end; |
| 623 | } |
| 624 | |
| 625 | ret = agent_enable_event(aevent, agt->domain); |
| 626 | if (ret != LTTNG_OK) { |
| 627 | goto error; |
| 628 | } |
| 629 | |
| 630 | /* If the event was created prior to the enable, add it to the domain. */ |
| 631 | if (created) { |
| 632 | agent_add_event(aevent, agt); |
| 633 | } |
| 634 | |
| 635 | end: |
| 636 | return LTTNG_OK; |
| 637 | |
| 638 | error: |
| 639 | if (created) { |
| 640 | agent_destroy_event(aevent); |
| 641 | } |
| 642 | return ret; |
| 643 | } |
| 644 | |
| 645 | /* |
| 646 | * Return the agent default event name to use by testing if the process is root |
| 647 | * or not. Return NULL on error. |
| 648 | */ |
| 649 | const char *event_get_default_agent_ust_name(enum lttng_domain_type domain) |
| 650 | { |
| 651 | const char *default_event_name = NULL; |
| 652 | |
| 653 | switch (domain) { |
| 654 | case LTTNG_DOMAIN_LOG4J: |
| 655 | if (is_root) { |
| 656 | default_event_name = DEFAULT_SYS_LOG4J_EVENT_NAME; |
| 657 | } else { |
| 658 | default_event_name = DEFAULT_USER_LOG4J_EVENT_NAME; |
| 659 | } |
| 660 | break; |
| 661 | case LTTNG_DOMAIN_JUL: |
| 662 | if (is_root) { |
| 663 | default_event_name = DEFAULT_SYS_JUL_EVENT_NAME; |
| 664 | } else { |
| 665 | default_event_name = DEFAULT_USER_JUL_EVENT_NAME; |
| 666 | } |
| 667 | break; |
| 668 | case LTTNG_DOMAIN_PYTHON: |
| 669 | default_event_name = DEFAULT_USER_PYTHON_EVENT_NAME; |
| 670 | break; |
| 671 | default: |
| 672 | assert(0); |
| 673 | } |
| 674 | |
| 675 | return default_event_name; |
| 676 | } |
| 677 | |
| 678 | /* |
| 679 | * Disable a single agent event for a given UST session. |
| 680 | * |
| 681 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 682 | */ |
| 683 | int event_agent_disable(struct ltt_ust_session *usess, struct agent *agt, |
| 684 | char *event_name) |
| 685 | { |
| 686 | int ret; |
| 687 | struct agent_event *aevent; |
| 688 | struct ltt_ust_event *uevent = NULL; |
| 689 | struct ltt_ust_channel *uchan = NULL; |
| 690 | const char *ust_event_name, *ust_channel_name; |
| 691 | |
| 692 | assert(agt); |
| 693 | assert(usess); |
| 694 | assert(event_name); |
| 695 | |
| 696 | DBG("Event agent disabling %s for session %" PRIu64, event_name, usess->id); |
| 697 | |
| 698 | aevent = agent_find_event_by_name(event_name, agt); |
| 699 | if (!aevent) { |
| 700 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 701 | goto error; |
| 702 | } |
| 703 | |
| 704 | /* Already disabled? */ |
| 705 | if (!aevent->enabled) { |
| 706 | goto end; |
| 707 | } |
| 708 | |
| 709 | if (agt->domain == LTTNG_DOMAIN_JUL) { |
| 710 | ust_channel_name = DEFAULT_JUL_CHANNEL_NAME; |
| 711 | } else if (agt->domain == LTTNG_DOMAIN_LOG4J) { |
| 712 | ust_channel_name = DEFAULT_LOG4J_CHANNEL_NAME; |
| 713 | } else if (agt->domain == LTTNG_DOMAIN_PYTHON) { |
| 714 | ust_channel_name = DEFAULT_PYTHON_CHANNEL_NAME; |
| 715 | } else { |
| 716 | ret = LTTNG_ERR_INVALID; |
| 717 | goto error; |
| 718 | } |
| 719 | |
| 720 | /* |
| 721 | * Disable it on the UST side. First get the channel reference then find |
| 722 | * the event and finally disable it. |
| 723 | */ |
| 724 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
| 725 | (char *) ust_channel_name); |
| 726 | if (!uchan) { |
| 727 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 728 | goto error; |
| 729 | } |
| 730 | |
| 731 | ust_event_name = event_get_default_agent_ust_name(agt->domain); |
| 732 | if (!ust_event_name) { |
| 733 | ret = LTTNG_ERR_FATAL; |
| 734 | goto error; |
| 735 | } |
| 736 | |
| 737 | /* |
| 738 | * The loglevel is hardcoded with 0 here since the agent ust event is set |
| 739 | * with the loglevel type to ALL thus the loglevel stays 0. The event's |
| 740 | * filter is the one handling the loglevel for agent. |
| 741 | */ |
| 742 | uevent = trace_ust_find_event(uchan->events, (char *) ust_event_name, |
| 743 | aevent->filter, 0, NULL); |
| 744 | /* If the agent event exists, it must be available on the UST side. */ |
| 745 | assert(uevent); |
| 746 | |
| 747 | ret = ust_app_disable_event_glb(usess, uchan, uevent); |
| 748 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
| 749 | ret = LTTNG_ERR_UST_DISABLE_FAIL; |
| 750 | goto error; |
| 751 | } |
| 752 | |
| 753 | /* |
| 754 | * Flag event that it's disabled so the shadow copy on the ust app side |
| 755 | * will disable it if an application shows up. |
| 756 | */ |
| 757 | uevent->enabled = 0; |
| 758 | |
| 759 | ret = agent_disable_event(aevent, agt->domain); |
| 760 | if (ret != LTTNG_OK) { |
| 761 | goto error; |
| 762 | } |
| 763 | |
| 764 | end: |
| 765 | return LTTNG_OK; |
| 766 | |
| 767 | error: |
| 768 | return ret; |
| 769 | } |
| 770 | /* |
| 771 | * Disable all agent event for a given UST session. |
| 772 | * |
| 773 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 774 | */ |
| 775 | int event_agent_disable_all(struct ltt_ust_session *usess, |
| 776 | struct agent *agt) |
| 777 | { |
| 778 | int ret; |
| 779 | struct agent_event *aevent; |
| 780 | struct lttng_ht_iter iter; |
| 781 | |
| 782 | assert(agt); |
| 783 | assert(usess); |
| 784 | |
| 785 | /* |
| 786 | * Disable event on agent application. Continue to disable all other events |
| 787 | * if the * event is not found. |
| 788 | */ |
| 789 | ret = event_agent_disable(usess, agt, "*"); |
| 790 | if (ret != LTTNG_OK && ret != LTTNG_ERR_UST_EVENT_NOT_FOUND) { |
| 791 | goto error; |
| 792 | } |
| 793 | |
| 794 | /* Flag every event that they are now enabled. */ |
| 795 | rcu_read_lock(); |
| 796 | cds_lfht_for_each_entry(agt->events->ht, &iter.iter, aevent, |
| 797 | node.node) { |
| 798 | if (!aevent->enabled) { |
| 799 | continue; |
| 800 | } |
| 801 | |
| 802 | ret = event_agent_disable(usess, agt, aevent->name); |
| 803 | if (ret != LTTNG_OK) { |
| 804 | rcu_read_unlock(); |
| 805 | goto error; |
| 806 | } |
| 807 | } |
| 808 | rcu_read_unlock(); |
| 809 | |
| 810 | ret = LTTNG_OK; |
| 811 | |
| 812 | error: |
| 813 | return ret; |
| 814 | } |