| 1 | /* |
| 2 | * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License, version 2 only, as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 51 |
| 15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _LGPL_SOURCE |
| 19 | #include <lttng/trigger/trigger.h> |
| 20 | #include <lttng/notification/channel-internal.h> |
| 21 | #include <lttng/notification/notification-internal.h> |
| 22 | #include <lttng/condition/condition-internal.h> |
| 23 | #include <lttng/condition/buffer-usage-internal.h> |
| 24 | #include <common/error.h> |
| 25 | #include <common/config/session-config.h> |
| 26 | #include <common/defaults.h> |
| 27 | #include <common/utils.h> |
| 28 | #include <common/align.h> |
| 29 | #include <common/time.h> |
| 30 | #include <sys/eventfd.h> |
| 31 | #include <sys/stat.h> |
| 32 | #include <time.h> |
| 33 | #include <signal.h> |
| 34 | |
| 35 | #include "notification-thread.h" |
| 36 | #include "notification-thread-events.h" |
| 37 | #include "notification-thread-commands.h" |
| 38 | #include "lttng-sessiond.h" |
| 39 | #include "health-sessiond.h" |
| 40 | #include "thread.h" |
| 41 | |
| 42 | #include <urcu.h> |
| 43 | #include <urcu/list.h> |
| 44 | #include <urcu/rculfhash.h> |
| 45 | |
| 46 | /* |
| 47 | * Destroy the thread data previously created by the init function. |
| 48 | */ |
| 49 | void notification_thread_handle_destroy( |
| 50 | struct notification_thread_handle *handle) |
| 51 | { |
| 52 | int ret; |
| 53 | |
| 54 | if (!handle) { |
| 55 | goto end; |
| 56 | } |
| 57 | |
| 58 | assert(cds_list_empty(&handle->cmd_queue.list)); |
| 59 | pthread_mutex_destroy(&handle->cmd_queue.lock); |
| 60 | sem_destroy(&handle->ready); |
| 61 | |
| 62 | if (handle->cmd_queue.event_pipe) { |
| 63 | lttng_pipe_destroy(handle->cmd_queue.event_pipe); |
| 64 | } |
| 65 | if (handle->channel_monitoring_pipes.ust32_consumer >= 0) { |
| 66 | ret = close(handle->channel_monitoring_pipes.ust32_consumer); |
| 67 | if (ret) { |
| 68 | PERROR("close 32-bit consumer channel monitoring pipe"); |
| 69 | } |
| 70 | } |
| 71 | if (handle->channel_monitoring_pipes.ust64_consumer >= 0) { |
| 72 | ret = close(handle->channel_monitoring_pipes.ust64_consumer); |
| 73 | if (ret) { |
| 74 | PERROR("close 64-bit consumer channel monitoring pipe"); |
| 75 | } |
| 76 | } |
| 77 | if (handle->channel_monitoring_pipes.kernel_consumer >= 0) { |
| 78 | ret = close(handle->channel_monitoring_pipes.kernel_consumer); |
| 79 | if (ret) { |
| 80 | PERROR("close kernel consumer channel monitoring pipe"); |
| 81 | } |
| 82 | } |
| 83 | end: |
| 84 | free(handle); |
| 85 | } |
| 86 | |
| 87 | struct notification_thread_handle *notification_thread_handle_create( |
| 88 | struct lttng_pipe *ust32_channel_monitor_pipe, |
| 89 | struct lttng_pipe *ust64_channel_monitor_pipe, |
| 90 | struct lttng_pipe *kernel_channel_monitor_pipe) |
| 91 | { |
| 92 | int ret; |
| 93 | struct notification_thread_handle *handle; |
| 94 | struct lttng_pipe *event_pipe = NULL; |
| 95 | |
| 96 | handle = zmalloc(sizeof(*handle)); |
| 97 | if (!handle) { |
| 98 | goto end; |
| 99 | } |
| 100 | |
| 101 | sem_init(&handle->ready, 0, 0); |
| 102 | |
| 103 | event_pipe = lttng_pipe_open(FD_CLOEXEC); |
| 104 | if (!event_pipe) { |
| 105 | ERR("event_pipe creation"); |
| 106 | goto error; |
| 107 | } |
| 108 | |
| 109 | handle->cmd_queue.event_pipe = event_pipe; |
| 110 | event_pipe = NULL; |
| 111 | |
| 112 | CDS_INIT_LIST_HEAD(&handle->cmd_queue.list); |
| 113 | ret = pthread_mutex_init(&handle->cmd_queue.lock, NULL); |
| 114 | if (ret) { |
| 115 | goto error; |
| 116 | } |
| 117 | |
| 118 | if (ust32_channel_monitor_pipe) { |
| 119 | handle->channel_monitoring_pipes.ust32_consumer = |
| 120 | lttng_pipe_release_readfd( |
| 121 | ust32_channel_monitor_pipe); |
| 122 | if (handle->channel_monitoring_pipes.ust32_consumer < 0) { |
| 123 | goto error; |
| 124 | } |
| 125 | } else { |
| 126 | handle->channel_monitoring_pipes.ust32_consumer = -1; |
| 127 | } |
| 128 | if (ust64_channel_monitor_pipe) { |
| 129 | handle->channel_monitoring_pipes.ust64_consumer = |
| 130 | lttng_pipe_release_readfd( |
| 131 | ust64_channel_monitor_pipe); |
| 132 | if (handle->channel_monitoring_pipes.ust64_consumer < 0) { |
| 133 | goto error; |
| 134 | } |
| 135 | } else { |
| 136 | handle->channel_monitoring_pipes.ust64_consumer = -1; |
| 137 | } |
| 138 | if (kernel_channel_monitor_pipe) { |
| 139 | handle->channel_monitoring_pipes.kernel_consumer = |
| 140 | lttng_pipe_release_readfd( |
| 141 | kernel_channel_monitor_pipe); |
| 142 | if (handle->channel_monitoring_pipes.kernel_consumer < 0) { |
| 143 | goto error; |
| 144 | } |
| 145 | } else { |
| 146 | handle->channel_monitoring_pipes.kernel_consumer = -1; |
| 147 | } |
| 148 | end: |
| 149 | return handle; |
| 150 | error: |
| 151 | lttng_pipe_destroy(event_pipe); |
| 152 | notification_thread_handle_destroy(handle); |
| 153 | return NULL; |
| 154 | } |
| 155 | |
| 156 | static |
| 157 | char *get_notification_channel_sock_path(void) |
| 158 | { |
| 159 | int ret; |
| 160 | bool is_root = !getuid(); |
| 161 | char *sock_path; |
| 162 | |
| 163 | sock_path = zmalloc(LTTNG_PATH_MAX); |
| 164 | if (!sock_path) { |
| 165 | goto error; |
| 166 | } |
| 167 | |
| 168 | if (is_root) { |
| 169 | ret = snprintf(sock_path, LTTNG_PATH_MAX, |
| 170 | DEFAULT_GLOBAL_NOTIFICATION_CHANNEL_UNIX_SOCK); |
| 171 | if (ret < 0) { |
| 172 | goto error; |
| 173 | } |
| 174 | } else { |
| 175 | char *home_path = utils_get_home_dir(); |
| 176 | |
| 177 | if (!home_path) { |
| 178 | ERR("Can't get HOME directory for socket creation"); |
| 179 | goto error; |
| 180 | } |
| 181 | |
| 182 | ret = snprintf(sock_path, LTTNG_PATH_MAX, |
| 183 | DEFAULT_HOME_NOTIFICATION_CHANNEL_UNIX_SOCK, |
| 184 | home_path); |
| 185 | if (ret < 0) { |
| 186 | goto error; |
| 187 | } |
| 188 | } |
| 189 | |
| 190 | return sock_path; |
| 191 | error: |
| 192 | free(sock_path); |
| 193 | return NULL; |
| 194 | } |
| 195 | |
| 196 | static |
| 197 | void notification_channel_socket_destroy(int fd) |
| 198 | { |
| 199 | int ret; |
| 200 | char *sock_path = get_notification_channel_sock_path(); |
| 201 | |
| 202 | DBG("[notification-thread] Destroying notification channel socket"); |
| 203 | |
| 204 | if (sock_path) { |
| 205 | ret = unlink(sock_path); |
| 206 | free(sock_path); |
| 207 | if (ret < 0) { |
| 208 | PERROR("unlink notification channel socket"); |
| 209 | } |
| 210 | } |
| 211 | |
| 212 | ret = close(fd); |
| 213 | if (ret) { |
| 214 | PERROR("close notification channel socket"); |
| 215 | } |
| 216 | } |
| 217 | |
| 218 | static |
| 219 | int notification_channel_socket_create(void) |
| 220 | { |
| 221 | int fd = -1, ret; |
| 222 | char *sock_path = get_notification_channel_sock_path(); |
| 223 | |
| 224 | DBG("[notification-thread] Creating notification channel UNIX socket at %s", |
| 225 | sock_path); |
| 226 | |
| 227 | ret = lttcomm_create_unix_sock(sock_path); |
| 228 | if (ret < 0) { |
| 229 | ERR("[notification-thread] Failed to create notification socket"); |
| 230 | goto error; |
| 231 | } |
| 232 | fd = ret; |
| 233 | |
| 234 | ret = chmod(sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 235 | if (ret < 0) { |
| 236 | ERR("Set file permissions failed: %s", sock_path); |
| 237 | PERROR("chmod notification channel socket"); |
| 238 | goto error; |
| 239 | } |
| 240 | |
| 241 | if (getuid() == 0) { |
| 242 | ret = chown(sock_path, 0, |
| 243 | utils_get_group_id(config.tracing_group_name.value)); |
| 244 | if (ret) { |
| 245 | ERR("Failed to set the notification channel socket's group"); |
| 246 | ret = -1; |
| 247 | goto error; |
| 248 | } |
| 249 | } |
| 250 | |
| 251 | DBG("[notification-thread] Notification channel UNIX socket created (fd = %i)", |
| 252 | fd); |
| 253 | free(sock_path); |
| 254 | return fd; |
| 255 | error: |
| 256 | if (fd >= 0 && close(fd) < 0) { |
| 257 | PERROR("close notification channel socket"); |
| 258 | } |
| 259 | free(sock_path); |
| 260 | return ret; |
| 261 | } |
| 262 | |
| 263 | static |
| 264 | int init_poll_set(struct lttng_poll_event *poll_set, |
| 265 | struct notification_thread_handle *handle, |
| 266 | int notification_channel_socket) |
| 267 | { |
| 268 | int ret; |
| 269 | |
| 270 | /* |
| 271 | * Create pollset with size 5: |
| 272 | * - notification channel socket (listen for new connections), |
| 273 | * - command queue event fd (internal sessiond commands), |
| 274 | * - consumerd (32-bit user space) channel monitor pipe, |
| 275 | * - consumerd (64-bit user space) channel monitor pipe, |
| 276 | * - consumerd (kernel) channel monitor pipe. |
| 277 | */ |
| 278 | ret = lttng_poll_create(poll_set, 5, LTTNG_CLOEXEC); |
| 279 | if (ret < 0) { |
| 280 | goto end; |
| 281 | } |
| 282 | |
| 283 | ret = lttng_poll_add(poll_set, notification_channel_socket, |
| 284 | LPOLLIN | LPOLLERR | LPOLLHUP | LPOLLRDHUP); |
| 285 | if (ret < 0) { |
| 286 | ERR("[notification-thread] Failed to add notification channel socket to pollset"); |
| 287 | goto error; |
| 288 | } |
| 289 | ret = lttng_poll_add(poll_set, lttng_pipe_get_readfd(handle->cmd_queue.event_pipe), |
| 290 | LPOLLIN | LPOLLERR); |
| 291 | if (ret < 0) { |
| 292 | ERR("[notification-thread] Failed to add notification command queue event fd to pollset"); |
| 293 | goto error; |
| 294 | } |
| 295 | ret = lttng_poll_add(poll_set, |
| 296 | handle->channel_monitoring_pipes.ust32_consumer, |
| 297 | LPOLLIN | LPOLLERR); |
| 298 | if (ret < 0) { |
| 299 | ERR("[notification-thread] Failed to add ust-32 channel monitoring pipe fd to pollset"); |
| 300 | goto error; |
| 301 | } |
| 302 | ret = lttng_poll_add(poll_set, |
| 303 | handle->channel_monitoring_pipes.ust64_consumer, |
| 304 | LPOLLIN | LPOLLERR); |
| 305 | if (ret < 0) { |
| 306 | ERR("[notification-thread] Failed to add ust-64 channel monitoring pipe fd to pollset"); |
| 307 | goto error; |
| 308 | } |
| 309 | if (handle->channel_monitoring_pipes.kernel_consumer < 0) { |
| 310 | goto end; |
| 311 | } |
| 312 | ret = lttng_poll_add(poll_set, |
| 313 | handle->channel_monitoring_pipes.kernel_consumer, |
| 314 | LPOLLIN | LPOLLERR); |
| 315 | if (ret < 0) { |
| 316 | ERR("[notification-thread] Failed to add kernel channel monitoring pipe fd to pollset"); |
| 317 | goto error; |
| 318 | } |
| 319 | end: |
| 320 | return ret; |
| 321 | error: |
| 322 | lttng_poll_clean(poll_set); |
| 323 | return ret; |
| 324 | } |
| 325 | |
| 326 | static |
| 327 | void fini_thread_state(struct notification_thread_state *state) |
| 328 | { |
| 329 | int ret; |
| 330 | |
| 331 | if (state->client_socket_ht) { |
| 332 | ret = handle_notification_thread_client_disconnect_all(state); |
| 333 | assert(!ret); |
| 334 | ret = cds_lfht_destroy(state->client_socket_ht, NULL); |
| 335 | assert(!ret); |
| 336 | } |
| 337 | if (state->triggers_ht) { |
| 338 | ret = handle_notification_thread_trigger_unregister_all(state); |
| 339 | assert(!ret); |
| 340 | ret = cds_lfht_destroy(state->triggers_ht, NULL); |
| 341 | assert(!ret); |
| 342 | } |
| 343 | if (state->channel_triggers_ht) { |
| 344 | ret = cds_lfht_destroy(state->channel_triggers_ht, NULL); |
| 345 | assert(!ret); |
| 346 | } |
| 347 | if (state->channel_state_ht) { |
| 348 | ret = cds_lfht_destroy(state->channel_state_ht, NULL); |
| 349 | assert(!ret); |
| 350 | } |
| 351 | if (state->notification_trigger_clients_ht) { |
| 352 | ret = cds_lfht_destroy(state->notification_trigger_clients_ht, |
| 353 | NULL); |
| 354 | assert(!ret); |
| 355 | } |
| 356 | if (state->channels_ht) { |
| 357 | ret = cds_lfht_destroy(state->channels_ht, NULL); |
| 358 | assert(!ret); |
| 359 | } |
| 360 | if (state->sessions_ht) { |
| 361 | ret = cds_lfht_destroy(state->sessions_ht, NULL); |
| 362 | assert(!ret); |
| 363 | } |
| 364 | /* |
| 365 | * Must be destroyed after all channels have been destroyed. |
| 366 | * See comment in struct lttng_session_trigger_list. |
| 367 | */ |
| 368 | if (state->session_triggers_ht) { |
| 369 | ret = cds_lfht_destroy(state->session_triggers_ht, NULL); |
| 370 | assert(!ret); |
| 371 | } |
| 372 | if (state->notification_channel_socket >= 0) { |
| 373 | notification_channel_socket_destroy( |
| 374 | state->notification_channel_socket); |
| 375 | } |
| 376 | lttng_poll_clean(&state->events); |
| 377 | } |
| 378 | |
| 379 | static |
| 380 | void mark_thread_as_ready(struct notification_thread_handle *handle) |
| 381 | { |
| 382 | DBG("Marking notification thread as ready"); |
| 383 | sem_post(&handle->ready); |
| 384 | } |
| 385 | |
| 386 | static |
| 387 | void wait_until_thread_is_ready(struct notification_thread_handle *handle) |
| 388 | { |
| 389 | DBG("Waiting for notification thread to be ready"); |
| 390 | sem_wait(&handle->ready); |
| 391 | DBG("Notification thread is ready"); |
| 392 | } |
| 393 | |
| 394 | static |
| 395 | int init_thread_state(struct notification_thread_handle *handle, |
| 396 | struct notification_thread_state *state) |
| 397 | { |
| 398 | int ret; |
| 399 | |
| 400 | memset(state, 0, sizeof(*state)); |
| 401 | state->notification_channel_socket = -1; |
| 402 | lttng_poll_init(&state->events); |
| 403 | |
| 404 | ret = notification_channel_socket_create(); |
| 405 | if (ret < 0) { |
| 406 | goto end; |
| 407 | } |
| 408 | state->notification_channel_socket = ret; |
| 409 | |
| 410 | ret = init_poll_set(&state->events, handle, |
| 411 | state->notification_channel_socket); |
| 412 | if (ret) { |
| 413 | goto end; |
| 414 | } |
| 415 | |
| 416 | DBG("[notification-thread] Listening on notification channel socket"); |
| 417 | ret = lttcomm_listen_unix_sock(state->notification_channel_socket); |
| 418 | if (ret < 0) { |
| 419 | ERR("[notification-thread] Listen failed on notification channel socket"); |
| 420 | goto error; |
| 421 | } |
| 422 | |
| 423 | state->client_socket_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, |
| 424 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); |
| 425 | if (!state->client_socket_ht) { |
| 426 | goto error; |
| 427 | } |
| 428 | |
| 429 | state->channel_triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, |
| 430 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); |
| 431 | if (!state->channel_triggers_ht) { |
| 432 | goto error; |
| 433 | } |
| 434 | |
| 435 | state->session_triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, |
| 436 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); |
| 437 | if (!state->session_triggers_ht) { |
| 438 | goto error; |
| 439 | } |
| 440 | |
| 441 | state->channel_state_ht = cds_lfht_new(DEFAULT_HT_SIZE, 1, 0, |
| 442 | CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); |
| 443 | if (!state->channel_state_ht) { |
| 444 | goto error; |
| 445 | } |
| 446 | |
| 447 | state->notification_trigger_clients_ht = cds_lfht_new(DEFAULT_HT_SIZE, |
| 448 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); |
| 449 | if (!state->notification_trigger_clients_ht) { |
| 450 | goto error; |
| 451 | } |
| 452 | |
| 453 | state->channels_ht = cds_lfht_new(DEFAULT_HT_SIZE, |
| 454 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); |
| 455 | if (!state->channels_ht) { |
| 456 | goto error; |
| 457 | } |
| 458 | state->sessions_ht = cds_lfht_new(DEFAULT_HT_SIZE, |
| 459 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); |
| 460 | if (!state->sessions_ht) { |
| 461 | goto error; |
| 462 | } |
| 463 | state->triggers_ht = cds_lfht_new(DEFAULT_HT_SIZE, |
| 464 | 1, 0, CDS_LFHT_AUTO_RESIZE | CDS_LFHT_ACCOUNTING, NULL); |
| 465 | if (!state->triggers_ht) { |
| 466 | goto error; |
| 467 | } |
| 468 | mark_thread_as_ready(handle); |
| 469 | end: |
| 470 | return 0; |
| 471 | error: |
| 472 | fini_thread_state(state); |
| 473 | return -1; |
| 474 | } |
| 475 | |
| 476 | static |
| 477 | int handle_channel_monitoring_pipe(int fd, uint32_t revents, |
| 478 | struct notification_thread_handle *handle, |
| 479 | struct notification_thread_state *state) |
| 480 | { |
| 481 | int ret = 0; |
| 482 | enum lttng_domain_type domain; |
| 483 | |
| 484 | if (fd == handle->channel_monitoring_pipes.ust32_consumer || |
| 485 | fd == handle->channel_monitoring_pipes.ust64_consumer) { |
| 486 | domain = LTTNG_DOMAIN_UST; |
| 487 | } else if (fd == handle->channel_monitoring_pipes.kernel_consumer) { |
| 488 | domain = LTTNG_DOMAIN_KERNEL; |
| 489 | } else { |
| 490 | abort(); |
| 491 | } |
| 492 | |
| 493 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 494 | ret = lttng_poll_del(&state->events, fd); |
| 495 | if (ret) { |
| 496 | ERR("[notification-thread] Failed to remove consumer monitoring pipe from poll set"); |
| 497 | } |
| 498 | goto end; |
| 499 | } |
| 500 | |
| 501 | ret = handle_notification_thread_channel_sample( |
| 502 | state, fd, domain); |
| 503 | if (ret) { |
| 504 | ERR("[notification-thread] Consumer sample handling error occurred"); |
| 505 | ret = -1; |
| 506 | goto end; |
| 507 | } |
| 508 | end: |
| 509 | return ret; |
| 510 | } |
| 511 | |
| 512 | /* |
| 513 | * This thread services notification channel clients and commands received |
| 514 | * from various lttng-sessiond components over a command queue. |
| 515 | */ |
| 516 | static |
| 517 | void *thread_notification(void *data) |
| 518 | { |
| 519 | int ret; |
| 520 | struct notification_thread_handle *handle = data; |
| 521 | struct notification_thread_state state; |
| 522 | |
| 523 | DBG("[notification-thread] Started notification thread"); |
| 524 | |
| 525 | if (!handle) { |
| 526 | ERR("[notification-thread] Invalid thread context provided"); |
| 527 | goto end; |
| 528 | } |
| 529 | |
| 530 | rcu_register_thread(); |
| 531 | rcu_thread_online(); |
| 532 | |
| 533 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_NOTIFICATION); |
| 534 | health_code_update(); |
| 535 | |
| 536 | ret = init_thread_state(handle, &state); |
| 537 | if (ret) { |
| 538 | goto end; |
| 539 | } |
| 540 | |
| 541 | while (true) { |
| 542 | int fd_count, i; |
| 543 | |
| 544 | health_poll_entry(); |
| 545 | DBG("[notification-thread] Entering poll wait"); |
| 546 | ret = lttng_poll_wait(&state.events, -1); |
| 547 | DBG("[notification-thread] Poll wait returned (%i)", ret); |
| 548 | health_poll_exit(); |
| 549 | if (ret < 0) { |
| 550 | /* |
| 551 | * Restart interrupted system call. |
| 552 | */ |
| 553 | if (errno == EINTR) { |
| 554 | continue; |
| 555 | } |
| 556 | ERR("[notification-thread] Error encountered during lttng_poll_wait (%i)", ret); |
| 557 | goto error; |
| 558 | } |
| 559 | |
| 560 | fd_count = ret; |
| 561 | for (i = 0; i < fd_count; i++) { |
| 562 | int fd = LTTNG_POLL_GETFD(&state.events, i); |
| 563 | uint32_t revents = LTTNG_POLL_GETEV(&state.events, i); |
| 564 | |
| 565 | if (!revents) { |
| 566 | continue; |
| 567 | } |
| 568 | DBG("[notification-thread] Handling fd (%i) activity (%u)", fd, revents); |
| 569 | |
| 570 | if (fd == state.notification_channel_socket) { |
| 571 | if (revents & LPOLLIN) { |
| 572 | ret = handle_notification_thread_client_connect( |
| 573 | &state); |
| 574 | if (ret < 0) { |
| 575 | goto error; |
| 576 | } |
| 577 | } else if (revents & |
| 578 | (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 579 | ERR("[notification-thread] Notification socket poll error"); |
| 580 | goto error; |
| 581 | } else { |
| 582 | ERR("[notification-thread] Unexpected poll events %u for notification socket %i", revents, fd); |
| 583 | goto error; |
| 584 | } |
| 585 | } else if (fd == lttng_pipe_get_readfd(handle->cmd_queue.event_pipe)) { |
| 586 | ret = handle_notification_thread_command(handle, |
| 587 | &state); |
| 588 | if (ret < 0) { |
| 589 | DBG("[notification-thread] Error encountered while servicing command queue"); |
| 590 | goto error; |
| 591 | } else if (ret > 0) { |
| 592 | goto exit; |
| 593 | } |
| 594 | } else if (fd == handle->channel_monitoring_pipes.ust32_consumer || |
| 595 | fd == handle->channel_monitoring_pipes.ust64_consumer || |
| 596 | fd == handle->channel_monitoring_pipes.kernel_consumer) { |
| 597 | ret = handle_channel_monitoring_pipe(fd, |
| 598 | revents, handle, &state); |
| 599 | if (ret) { |
| 600 | goto error; |
| 601 | } |
| 602 | } else { |
| 603 | /* Activity on a client's socket. */ |
| 604 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 605 | /* |
| 606 | * It doesn't matter if a command was |
| 607 | * pending on the client socket at this |
| 608 | * point since it now has no way to |
| 609 | * receive the notifications to which |
| 610 | * it was subscribing or unsubscribing. |
| 611 | */ |
| 612 | ret = handle_notification_thread_client_disconnect( |
| 613 | fd, &state); |
| 614 | if (ret) { |
| 615 | goto error; |
| 616 | } |
| 617 | } else { |
| 618 | if (revents & LPOLLIN) { |
| 619 | ret = handle_notification_thread_client_in( |
| 620 | &state, fd); |
| 621 | if (ret) { |
| 622 | goto error; |
| 623 | } |
| 624 | } |
| 625 | |
| 626 | if (revents & LPOLLOUT) { |
| 627 | ret = handle_notification_thread_client_out( |
| 628 | &state, fd); |
| 629 | if (ret) { |
| 630 | goto error; |
| 631 | } |
| 632 | } |
| 633 | } |
| 634 | } |
| 635 | } |
| 636 | } |
| 637 | exit: |
| 638 | error: |
| 639 | fini_thread_state(&state); |
| 640 | health_unregister(health_sessiond); |
| 641 | rcu_thread_offline(); |
| 642 | rcu_unregister_thread(); |
| 643 | end: |
| 644 | return NULL; |
| 645 | } |
| 646 | |
| 647 | static |
| 648 | bool shutdown_notification_thread(void *thread_data) |
| 649 | { |
| 650 | struct notification_thread_handle *handle = thread_data; |
| 651 | |
| 652 | notification_thread_command_quit(handle); |
| 653 | return true; |
| 654 | } |
| 655 | |
| 656 | struct lttng_thread *launch_notification_thread( |
| 657 | struct notification_thread_handle *handle) |
| 658 | { |
| 659 | struct lttng_thread *thread; |
| 660 | |
| 661 | thread = lttng_thread_create("Notification", |
| 662 | thread_notification, |
| 663 | shutdown_notification_thread, |
| 664 | NULL, |
| 665 | handle); |
| 666 | if (!thread) { |
| 667 | goto error; |
| 668 | } |
| 669 | |
| 670 | /* |
| 671 | * Wait for the thread to be marked as "ready" before returning |
| 672 | * as other subsystems depend on the notification subsystem |
| 673 | * (e.g. rotation thread). |
| 674 | */ |
| 675 | wait_until_thread_is_ready(handle); |
| 676 | return thread; |
| 677 | error: |
| 678 | return NULL; |
| 679 | } |