| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <errno.h> |
| 20 | #include <urcu/list.h> |
| 21 | #include <string.h> |
| 22 | |
| 23 | #include <lttng/lttng.h> |
| 24 | #include <common/error.h> |
| 25 | #include <common/sessiond-comm/sessiond-comm.h> |
| 26 | |
| 27 | #include "channel.h" |
| 28 | #include "event.h" |
| 29 | #include "kernel.h" |
| 30 | #include "ust-ctl.h" |
| 31 | #include "ust-app.h" |
| 32 | #include "trace-kernel.h" |
| 33 | #include "trace-ust.h" |
| 34 | |
| 35 | /* |
| 36 | * Add unique UST event based on the event name, filter bytecode and loglevel. |
| 37 | */ |
| 38 | static void add_unique_ust_event(struct lttng_ht *ht, |
| 39 | struct ltt_ust_event *event) |
| 40 | { |
| 41 | struct cds_lfht_node *node_ptr; |
| 42 | struct ltt_ust_ht_key key; |
| 43 | |
| 44 | assert(ht); |
| 45 | assert(ht->ht); |
| 46 | assert(event); |
| 47 | |
| 48 | key.name = event->attr.name; |
| 49 | key.filter = (struct lttng_filter_bytecode *) event->filter; |
| 50 | key.loglevel = event->attr.loglevel; |
| 51 | key.exclusion = event->exclusion; |
| 52 | |
| 53 | node_ptr = cds_lfht_add_unique(ht->ht, |
| 54 | ht->hash_fct(event->node.key, lttng_ht_seed), |
| 55 | trace_ust_ht_match_event, &key, &event->node.node); |
| 56 | assert(node_ptr == &event->node.node); |
| 57 | } |
| 58 | |
| 59 | /* |
| 60 | * Setup a lttng_event used to enable *all* syscall tracing. |
| 61 | */ |
| 62 | static void init_syscalls_kernel_event(struct lttng_event *event) |
| 63 | { |
| 64 | assert(event); |
| 65 | |
| 66 | event->name[0] = '\0'; |
| 67 | /* |
| 68 | * We use LTTNG_EVENT* here since the trace kernel creation will make the |
| 69 | * right changes for the kernel. |
| 70 | */ |
| 71 | event->type = LTTNG_EVENT_SYSCALL; |
| 72 | } |
| 73 | |
| 74 | /* |
| 75 | * Disable kernel tracepoint event for a channel from the kernel session. |
| 76 | */ |
| 77 | int event_kernel_disable_tracepoint(struct ltt_kernel_channel *kchan, |
| 78 | char *event_name) |
| 79 | { |
| 80 | int ret; |
| 81 | struct ltt_kernel_event *kevent; |
| 82 | |
| 83 | assert(kchan); |
| 84 | |
| 85 | kevent = trace_kernel_get_event_by_name(event_name, kchan); |
| 86 | if (kevent == NULL) { |
| 87 | ret = LTTNG_ERR_NO_EVENT; |
| 88 | goto error; |
| 89 | } |
| 90 | |
| 91 | ret = kernel_disable_event(kevent); |
| 92 | if (ret < 0) { |
| 93 | ret = LTTNG_ERR_KERN_DISABLE_FAIL; |
| 94 | goto error; |
| 95 | } |
| 96 | |
| 97 | DBG("Kernel event %s disable for channel %s.", |
| 98 | kevent->event->name, kchan->channel->name); |
| 99 | |
| 100 | ret = LTTNG_OK; |
| 101 | |
| 102 | error: |
| 103 | return ret; |
| 104 | } |
| 105 | |
| 106 | /* |
| 107 | * Disable kernel tracepoint events for a channel from the kernel session. |
| 108 | */ |
| 109 | int event_kernel_disable_all_tracepoints(struct ltt_kernel_channel *kchan) |
| 110 | { |
| 111 | int ret; |
| 112 | struct ltt_kernel_event *kevent; |
| 113 | |
| 114 | assert(kchan); |
| 115 | |
| 116 | /* For each event in the kernel session */ |
| 117 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { |
| 118 | ret = kernel_disable_event(kevent); |
| 119 | if (ret < 0) { |
| 120 | /* We continue disabling the rest */ |
| 121 | continue; |
| 122 | } |
| 123 | } |
| 124 | ret = LTTNG_OK; |
| 125 | return ret; |
| 126 | } |
| 127 | |
| 128 | /* |
| 129 | * Disable kernel syscall events for a channel from the kernel session. |
| 130 | */ |
| 131 | int event_kernel_disable_all_syscalls(struct ltt_kernel_channel *kchan) |
| 132 | { |
| 133 | ERR("Cannot disable syscall tracing for existing session. Please destroy session instead."); |
| 134 | return LTTNG_OK; /* Return OK so disable all succeeds */ |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * Disable all kernel event for a channel from the kernel session. |
| 139 | */ |
| 140 | int event_kernel_disable_all(struct ltt_kernel_channel *kchan) |
| 141 | { |
| 142 | int ret; |
| 143 | |
| 144 | assert(kchan); |
| 145 | |
| 146 | ret = event_kernel_disable_all_tracepoints(kchan); |
| 147 | if (ret != LTTNG_OK) |
| 148 | return ret; |
| 149 | ret = event_kernel_disable_all_syscalls(kchan); |
| 150 | return ret; |
| 151 | } |
| 152 | |
| 153 | /* |
| 154 | * Enable kernel tracepoint event for a channel from the kernel session. |
| 155 | */ |
| 156 | int event_kernel_enable_tracepoint(struct ltt_kernel_channel *kchan, |
| 157 | struct lttng_event *event) |
| 158 | { |
| 159 | int ret; |
| 160 | struct ltt_kernel_event *kevent; |
| 161 | |
| 162 | assert(kchan); |
| 163 | assert(event); |
| 164 | |
| 165 | kevent = trace_kernel_get_event_by_name(event->name, kchan); |
| 166 | if (kevent == NULL) { |
| 167 | ret = kernel_create_event(event, kchan); |
| 168 | if (ret < 0) { |
| 169 | switch (-ret) { |
| 170 | case EEXIST: |
| 171 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
| 172 | break; |
| 173 | case ENOSYS: |
| 174 | ret = LTTNG_ERR_KERN_EVENT_ENOSYS; |
| 175 | break; |
| 176 | default: |
| 177 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
| 178 | break; |
| 179 | } |
| 180 | goto end; |
| 181 | } |
| 182 | } else if (kevent->enabled == 0) { |
| 183 | ret = kernel_enable_event(kevent); |
| 184 | if (ret < 0) { |
| 185 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
| 186 | goto end; |
| 187 | } |
| 188 | } else { |
| 189 | /* At this point, the event is considered enabled */ |
| 190 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
| 191 | goto end; |
| 192 | } |
| 193 | |
| 194 | ret = LTTNG_OK; |
| 195 | end: |
| 196 | return ret; |
| 197 | } |
| 198 | |
| 199 | /* |
| 200 | * Enable all kernel tracepoint events of a channel of the kernel session. |
| 201 | */ |
| 202 | int event_kernel_enable_all_tracepoints(struct ltt_kernel_channel *kchan, |
| 203 | int kernel_tracer_fd) |
| 204 | { |
| 205 | int size, i, ret; |
| 206 | struct ltt_kernel_event *kevent; |
| 207 | struct lttng_event *event_list = NULL; |
| 208 | |
| 209 | assert(kchan); |
| 210 | |
| 211 | /* For each event in the kernel session */ |
| 212 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { |
| 213 | if (kevent->enabled == 0) { |
| 214 | ret = kernel_enable_event(kevent); |
| 215 | if (ret < 0) { |
| 216 | /* Enable failed but still continue */ |
| 217 | continue; |
| 218 | } |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
| 223 | if (size < 0) { |
| 224 | ret = LTTNG_ERR_KERN_LIST_FAIL; |
| 225 | goto end; |
| 226 | } |
| 227 | |
| 228 | for (i = 0; i < size; i++) { |
| 229 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); |
| 230 | if (kevent == NULL) { |
| 231 | /* Default event type for enable all */ |
| 232 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; |
| 233 | /* Enable each single tracepoint event */ |
| 234 | ret = kernel_create_event(&event_list[i], kchan); |
| 235 | if (ret < 0) { |
| 236 | /* Ignore error here and continue */ |
| 237 | } |
| 238 | } |
| 239 | } |
| 240 | free(event_list); |
| 241 | |
| 242 | ret = LTTNG_OK; |
| 243 | end: |
| 244 | return ret; |
| 245 | } |
| 246 | |
| 247 | /* |
| 248 | * Enable all kernel sycalls events of a channel of the kernel session. |
| 249 | */ |
| 250 | int event_kernel_enable_all_syscalls(struct ltt_kernel_channel *kchan, |
| 251 | int kernel_tracer_fd) |
| 252 | { |
| 253 | int ret; |
| 254 | struct lttng_event event; |
| 255 | |
| 256 | assert(kchan); |
| 257 | |
| 258 | init_syscalls_kernel_event(&event); |
| 259 | |
| 260 | DBG("Enabling all syscall tracing"); |
| 261 | |
| 262 | ret = kernel_create_event(&event, kchan); |
| 263 | if (ret < 0) { |
| 264 | if (ret == -EEXIST) { |
| 265 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
| 266 | } else { |
| 267 | ret = LTTNG_ERR_KERN_ENABLE_FAIL; |
| 268 | } |
| 269 | goto end; |
| 270 | } |
| 271 | |
| 272 | ret = LTTNG_OK; |
| 273 | end: |
| 274 | return ret; |
| 275 | } |
| 276 | |
| 277 | /* |
| 278 | * Enable all kernel events of a channel of the kernel session. |
| 279 | */ |
| 280 | int event_kernel_enable_all(struct ltt_kernel_channel *kchan, |
| 281 | int kernel_tracer_fd) |
| 282 | { |
| 283 | int tp_ret; |
| 284 | |
| 285 | assert(kchan); |
| 286 | |
| 287 | tp_ret = event_kernel_enable_all_tracepoints(kchan, kernel_tracer_fd); |
| 288 | if (tp_ret != LTTNG_OK) { |
| 289 | goto end; |
| 290 | } |
| 291 | |
| 292 | /* |
| 293 | * Reaching this code path means that all tracepoints were enabled without |
| 294 | * errors so we ignore the error value of syscalls. |
| 295 | * |
| 296 | * At the moment, failing to enable syscalls on "lttng enable-event -a -k" |
| 297 | * is not considered an error that need to be returned to the client since |
| 298 | * tracepoints did not fail. Future work will allow us to send back |
| 299 | * multiple errors to the client in one API call. |
| 300 | */ |
| 301 | (void) event_kernel_enable_all_syscalls(kchan, kernel_tracer_fd); |
| 302 | |
| 303 | end: |
| 304 | return tp_ret; |
| 305 | } |
| 306 | |
| 307 | /* |
| 308 | * ============================ |
| 309 | * UST : The Ultimate Frontier! |
| 310 | * ============================ |
| 311 | */ |
| 312 | |
| 313 | /* |
| 314 | * Enable all UST tracepoints for a channel from a UST session. |
| 315 | */ |
| 316 | int event_ust_enable_all_tracepoints(struct ltt_ust_session *usess, |
| 317 | struct ltt_ust_channel *uchan, struct lttng_filter_bytecode *filter) |
| 318 | { |
| 319 | int ret, i, size; |
| 320 | struct lttng_ht_iter iter; |
| 321 | struct ltt_ust_event *uevent = NULL; |
| 322 | struct lttng_event *events = NULL; |
| 323 | |
| 324 | assert(usess); |
| 325 | assert(uchan); |
| 326 | |
| 327 | rcu_read_lock(); |
| 328 | |
| 329 | /* Enable existing events */ |
| 330 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, |
| 331 | node.node) { |
| 332 | if (uevent->enabled == 0) { |
| 333 | ret = ust_app_enable_event_glb(usess, uchan, uevent); |
| 334 | if (ret < 0) { |
| 335 | continue; |
| 336 | } |
| 337 | uevent->enabled = 1; |
| 338 | } |
| 339 | } |
| 340 | |
| 341 | /* Get all UST available events */ |
| 342 | size = ust_app_list_events(&events); |
| 343 | if (size < 0) { |
| 344 | ret = LTTNG_ERR_UST_LIST_FAIL; |
| 345 | goto error; |
| 346 | } |
| 347 | |
| 348 | for (i = 0; i < size; i++) { |
| 349 | /* |
| 350 | * Check if event exist and if so, continue since it was enable |
| 351 | * previously. |
| 352 | */ |
| 353 | uevent = trace_ust_find_event(uchan->events, events[i].name, filter, |
| 354 | events[i].loglevel, NULL); |
| 355 | if (uevent != NULL) { |
| 356 | ret = ust_app_enable_event_pid(usess, uchan, uevent, |
| 357 | events[i].pid); |
| 358 | if (ret < 0) { |
| 359 | if (ret != -LTTNG_UST_ERR_EXIST) { |
| 360 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 361 | goto error; |
| 362 | } |
| 363 | } |
| 364 | continue; |
| 365 | } |
| 366 | |
| 367 | /* Create ust event */ |
| 368 | uevent = trace_ust_create_event(&events[i], filter, NULL); |
| 369 | if (uevent == NULL) { |
| 370 | ret = LTTNG_ERR_FATAL; |
| 371 | goto error_destroy; |
| 372 | } |
| 373 | |
| 374 | /* Create event for the specific PID */ |
| 375 | ret = ust_app_enable_event_pid(usess, uchan, uevent, |
| 376 | events[i].pid); |
| 377 | if (ret < 0) { |
| 378 | if (ret == -LTTNG_UST_ERR_EXIST) { |
| 379 | ret = LTTNG_ERR_UST_EVENT_EXIST; |
| 380 | goto error; |
| 381 | } else { |
| 382 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 383 | goto error_destroy; |
| 384 | } |
| 385 | } |
| 386 | |
| 387 | uevent->enabled = 1; |
| 388 | /* Add ltt ust event to channel */ |
| 389 | rcu_read_lock(); |
| 390 | add_unique_ust_event(uchan->events, uevent); |
| 391 | rcu_read_unlock(); |
| 392 | } |
| 393 | free(events); |
| 394 | |
| 395 | rcu_read_unlock(); |
| 396 | return LTTNG_OK; |
| 397 | |
| 398 | error_destroy: |
| 399 | trace_ust_destroy_event(uevent); |
| 400 | |
| 401 | error: |
| 402 | free(events); |
| 403 | rcu_read_unlock(); |
| 404 | return ret; |
| 405 | } |
| 406 | |
| 407 | /* |
| 408 | * Enable UST tracepoint event for a channel from a UST session. |
| 409 | */ |
| 410 | int event_ust_enable_tracepoint(struct ltt_ust_session *usess, |
| 411 | struct ltt_ust_channel *uchan, struct lttng_event *event, |
| 412 | struct lttng_filter_bytecode *filter, |
| 413 | struct lttng_event_exclusion *exclusion) |
| 414 | { |
| 415 | int ret = LTTNG_OK, to_create = 0; |
| 416 | struct ltt_ust_event *uevent; |
| 417 | |
| 418 | assert(usess); |
| 419 | assert(uchan); |
| 420 | assert(event); |
| 421 | |
| 422 | rcu_read_lock(); |
| 423 | |
| 424 | uevent = trace_ust_find_event(uchan->events, event->name, filter, |
| 425 | event->loglevel, exclusion); |
| 426 | if (uevent == NULL) { |
| 427 | uevent = trace_ust_create_event(event, filter, exclusion); |
| 428 | if (uevent == NULL) { |
| 429 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 430 | goto error; |
| 431 | } |
| 432 | |
| 433 | /* Valid to set it after the goto error since uevent is still NULL */ |
| 434 | to_create = 1; |
| 435 | } |
| 436 | |
| 437 | if (uevent->enabled) { |
| 438 | /* It's already enabled so everything is OK */ |
| 439 | ret = LTTNG_ERR_UST_EVENT_ENABLED; |
| 440 | goto end; |
| 441 | } |
| 442 | |
| 443 | uevent->enabled = 1; |
| 444 | |
| 445 | if (to_create) { |
| 446 | /* Create event on all UST registered apps for session */ |
| 447 | ret = ust_app_create_event_glb(usess, uchan, uevent); |
| 448 | } else { |
| 449 | /* Enable event on all UST registered apps for session */ |
| 450 | ret = ust_app_enable_event_glb(usess, uchan, uevent); |
| 451 | } |
| 452 | |
| 453 | if (ret < 0) { |
| 454 | if (ret == -LTTNG_UST_ERR_EXIST) { |
| 455 | ret = LTTNG_ERR_UST_EVENT_EXIST; |
| 456 | goto end; |
| 457 | } else { |
| 458 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 459 | goto error; |
| 460 | } |
| 461 | } |
| 462 | |
| 463 | if (to_create) { |
| 464 | /* Add ltt ust event to channel */ |
| 465 | add_unique_ust_event(uchan->events, uevent); |
| 466 | } |
| 467 | |
| 468 | DBG("Event UST %s %s in channel %s", uevent->attr.name, |
| 469 | to_create ? "created" : "enabled", uchan->name); |
| 470 | |
| 471 | ret = LTTNG_OK; |
| 472 | |
| 473 | end: |
| 474 | rcu_read_unlock(); |
| 475 | return ret; |
| 476 | |
| 477 | error: |
| 478 | /* |
| 479 | * Only destroy event on creation time (not enabling time) because if the |
| 480 | * event is found in the channel (to_create == 0), it means that at some |
| 481 | * point the enable_event worked and it's thus valid to keep it alive. |
| 482 | * Destroying it also implies that we also destroy it's shadow copy to sync |
| 483 | * everyone up. |
| 484 | */ |
| 485 | if (to_create) { |
| 486 | /* In this code path, the uevent was not added to the hash table */ |
| 487 | trace_ust_destroy_event(uevent); |
| 488 | } |
| 489 | rcu_read_unlock(); |
| 490 | return ret; |
| 491 | } |
| 492 | |
| 493 | /* |
| 494 | * Disable UST tracepoint of a channel from a UST session. |
| 495 | */ |
| 496 | int event_ust_disable_tracepoint(struct ltt_ust_session *usess, |
| 497 | struct ltt_ust_channel *uchan, char *event_name) |
| 498 | { |
| 499 | int ret; |
| 500 | struct ltt_ust_event *uevent; |
| 501 | struct lttng_ht_node_str *node; |
| 502 | struct lttng_ht_iter iter; |
| 503 | struct lttng_ht *ht; |
| 504 | |
| 505 | assert(usess); |
| 506 | assert(uchan); |
| 507 | assert(event_name); |
| 508 | |
| 509 | ht = uchan->events; |
| 510 | |
| 511 | rcu_read_lock(); |
| 512 | |
| 513 | /* |
| 514 | * We use a custom lookup since we need the iterator for the next_duplicate |
| 515 | * call in the do while loop below. |
| 516 | */ |
| 517 | cds_lfht_lookup(ht->ht, ht->hash_fct((void *) event_name, lttng_ht_seed), |
| 518 | trace_ust_ht_match_event_by_name, event_name, &iter.iter); |
| 519 | node = lttng_ht_iter_get_node_str(&iter); |
| 520 | if (node == NULL) { |
| 521 | DBG2("Trace UST event NOT found by name %s", event_name); |
| 522 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 523 | goto error; |
| 524 | } |
| 525 | |
| 526 | do { |
| 527 | uevent = caa_container_of(node, struct ltt_ust_event, node); |
| 528 | assert(uevent); |
| 529 | |
| 530 | if (uevent->enabled == 0) { |
| 531 | /* It's already disabled so everything is OK */ |
| 532 | goto next; |
| 533 | } |
| 534 | |
| 535 | ret = ust_app_disable_event_glb(usess, uchan, uevent); |
| 536 | if (ret < 0 && ret != -LTTNG_UST_ERR_EXIST) { |
| 537 | ret = LTTNG_ERR_UST_DISABLE_FAIL; |
| 538 | goto error; |
| 539 | } |
| 540 | uevent->enabled = 0; |
| 541 | |
| 542 | DBG2("Event UST %s disabled in channel %s", uevent->attr.name, |
| 543 | uchan->name); |
| 544 | |
| 545 | next: |
| 546 | /* Get next duplicate event by name. */ |
| 547 | cds_lfht_next_duplicate(ht->ht, trace_ust_ht_match_event_by_name, |
| 548 | event_name, &iter.iter); |
| 549 | node = lttng_ht_iter_get_node_str(&iter); |
| 550 | } while (node); |
| 551 | |
| 552 | ret = LTTNG_OK; |
| 553 | |
| 554 | error: |
| 555 | rcu_read_unlock(); |
| 556 | return ret; |
| 557 | } |
| 558 | |
| 559 | /* |
| 560 | * Disable all UST tracepoints for a channel from a UST session. |
| 561 | */ |
| 562 | int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess, |
| 563 | struct ltt_ust_channel *uchan) |
| 564 | { |
| 565 | int ret, i, size; |
| 566 | struct lttng_ht_iter iter; |
| 567 | struct ltt_ust_event *uevent = NULL; |
| 568 | struct lttng_event *events = NULL; |
| 569 | |
| 570 | assert(usess); |
| 571 | assert(uchan); |
| 572 | |
| 573 | rcu_read_lock(); |
| 574 | |
| 575 | /* Disabling existing events */ |
| 576 | cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent, |
| 577 | node.node) { |
| 578 | if (uevent->enabled == 1) { |
| 579 | ret = event_ust_disable_tracepoint(usess, uchan, |
| 580 | uevent->attr.name); |
| 581 | if (ret < 0) { |
| 582 | continue; |
| 583 | } |
| 584 | } |
| 585 | } |
| 586 | |
| 587 | /* Get all UST available events */ |
| 588 | size = ust_app_list_events(&events); |
| 589 | if (size < 0) { |
| 590 | ret = LTTNG_ERR_UST_LIST_FAIL; |
| 591 | goto error; |
| 592 | } |
| 593 | |
| 594 | for (i = 0; i < size; i++) { |
| 595 | ret = event_ust_disable_tracepoint(usess, uchan, |
| 596 | events[i].name); |
| 597 | if (ret != LTTNG_OK) { |
| 598 | /* Continue to disable the rest... */ |
| 599 | continue; |
| 600 | } |
| 601 | } |
| 602 | free(events); |
| 603 | |
| 604 | rcu_read_unlock(); |
| 605 | return LTTNG_OK; |
| 606 | |
| 607 | error: |
| 608 | free(events); |
| 609 | rcu_read_unlock(); |
| 610 | return ret; |
| 611 | } |
| 612 | |
| 613 | /* |
| 614 | * Enable all JUL event for a given UST session. |
| 615 | * |
| 616 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 617 | */ |
| 618 | int event_jul_enable_all(struct ltt_ust_session *usess, |
| 619 | struct lttng_event *event) |
| 620 | { |
| 621 | int ret; |
| 622 | struct jul_event *jevent; |
| 623 | struct lttng_ht_iter iter; |
| 624 | |
| 625 | assert(usess); |
| 626 | |
| 627 | DBG("Event JUL enabling ALL events for session %" PRIu64, usess->id); |
| 628 | |
| 629 | /* Enable event on JUL application through TCP socket. */ |
| 630 | ret = event_jul_enable(usess, event); |
| 631 | if (ret != LTTNG_OK) { |
| 632 | goto error; |
| 633 | } |
| 634 | |
| 635 | /* Flag every event that they are now enabled. */ |
| 636 | rcu_read_lock(); |
| 637 | cds_lfht_for_each_entry(usess->domain_jul.events->ht, &iter.iter, jevent, |
| 638 | node.node) { |
| 639 | jevent->enabled = 1; |
| 640 | } |
| 641 | rcu_read_unlock(); |
| 642 | |
| 643 | ret = LTTNG_OK; |
| 644 | |
| 645 | error: |
| 646 | return ret; |
| 647 | } |
| 648 | |
| 649 | /* |
| 650 | * Enable a single JUL event for a given UST session. |
| 651 | * |
| 652 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 653 | */ |
| 654 | int event_jul_enable(struct ltt_ust_session *usess, struct lttng_event *event) |
| 655 | { |
| 656 | int ret, created = 0; |
| 657 | struct jul_event *jevent; |
| 658 | |
| 659 | assert(usess); |
| 660 | assert(event); |
| 661 | |
| 662 | DBG("Event JUL enabling %s for session %" PRIu64 " with loglevel type %d " |
| 663 | "and loglevel %d", event->name, usess->id, event->loglevel_type, |
| 664 | event->loglevel); |
| 665 | |
| 666 | jevent = jul_find_event(event->name, event->loglevel, &usess->domain_jul); |
| 667 | if (!jevent) { |
| 668 | jevent = jul_create_event(event->name); |
| 669 | if (!jevent) { |
| 670 | ret = LTTNG_ERR_NOMEM; |
| 671 | goto error; |
| 672 | } |
| 673 | jevent->loglevel = event->loglevel; |
| 674 | jevent->loglevel_type = event->loglevel_type; |
| 675 | created = 1; |
| 676 | } |
| 677 | |
| 678 | /* Already enabled? */ |
| 679 | if (jevent->enabled) { |
| 680 | goto end; |
| 681 | } |
| 682 | |
| 683 | ret = jul_enable_event(jevent); |
| 684 | if (ret != LTTNG_OK) { |
| 685 | goto error; |
| 686 | } |
| 687 | |
| 688 | /* If the event was created prior to the enable, add it to the domain. */ |
| 689 | if (created) { |
| 690 | jul_add_event(jevent, &usess->domain_jul); |
| 691 | } |
| 692 | |
| 693 | end: |
| 694 | return LTTNG_OK; |
| 695 | |
| 696 | error: |
| 697 | if (created) { |
| 698 | jul_destroy_event(jevent); |
| 699 | } |
| 700 | return ret; |
| 701 | } |
| 702 | |
| 703 | /* |
| 704 | * Disable a single JUL event for a given UST session. |
| 705 | * |
| 706 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 707 | */ |
| 708 | int event_jul_disable(struct ltt_ust_session *usess, char *event_name) |
| 709 | { |
| 710 | int ret; |
| 711 | struct jul_event *jevent; |
| 712 | |
| 713 | assert(usess); |
| 714 | assert(event_name); |
| 715 | |
| 716 | DBG("Event JUL disabling %s for session %" PRIu64, event_name, usess->id); |
| 717 | |
| 718 | jevent = jul_find_event_by_name(event_name, &usess->domain_jul); |
| 719 | if (!jevent) { |
| 720 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 721 | goto error; |
| 722 | } |
| 723 | |
| 724 | /* Already disabled? */ |
| 725 | if (!jevent->enabled) { |
| 726 | goto end; |
| 727 | } |
| 728 | |
| 729 | ret = jul_disable_event(jevent); |
| 730 | if (ret != LTTNG_OK) { |
| 731 | goto error; |
| 732 | } |
| 733 | |
| 734 | end: |
| 735 | return LTTNG_OK; |
| 736 | |
| 737 | error: |
| 738 | return ret; |
| 739 | } |
| 740 | /* |
| 741 | * Disable all JUL event for a given UST session. |
| 742 | * |
| 743 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 744 | */ |
| 745 | int event_jul_disable_all(struct ltt_ust_session *usess) |
| 746 | { |
| 747 | int ret, do_disable = 0; |
| 748 | struct jul_event *jevent; |
| 749 | struct lttng_ht_iter iter; |
| 750 | |
| 751 | assert(usess); |
| 752 | |
| 753 | /* Enable event on JUL application through TCP socket. */ |
| 754 | ret = event_jul_disable(usess, "*"); |
| 755 | if (ret != LTTNG_OK) { |
| 756 | if (ret == LTTNG_ERR_UST_EVENT_NOT_FOUND) { |
| 757 | /* |
| 758 | * This means that no enable all was done before but still a user |
| 759 | * could want to disable everything even though the * wild card |
| 760 | * event does not exists. |
| 761 | */ |
| 762 | do_disable = 1; |
| 763 | } else { |
| 764 | goto error; |
| 765 | } |
| 766 | } |
| 767 | |
| 768 | /* Flag every event that they are now enabled. */ |
| 769 | rcu_read_lock(); |
| 770 | cds_lfht_for_each_entry(usess->domain_jul.events->ht, &iter.iter, jevent, |
| 771 | node.node) { |
| 772 | if (jevent->enabled && do_disable) { |
| 773 | ret = event_jul_disable(usess, jevent->name); |
| 774 | if (ret != LTTNG_OK) { |
| 775 | rcu_read_unlock(); |
| 776 | goto error; |
| 777 | } |
| 778 | } |
| 779 | jevent->enabled = 0; |
| 780 | } |
| 781 | rcu_read_unlock(); |
| 782 | |
| 783 | ret = LTTNG_OK; |
| 784 | |
| 785 | error: |
| 786 | return ret; |
| 787 | } |