| 1 | /* |
| 2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * Copyright (C) 2017 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License, version 2 only, |
| 8 | * as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | */ |
| 19 | |
| 20 | #define _LGPL_SOURCE |
| 21 | #include <assert.h> |
| 22 | #include <lttng/ust-ctl.h> |
| 23 | #include <poll.h> |
| 24 | #include <pthread.h> |
| 25 | #include <stdlib.h> |
| 26 | #include <string.h> |
| 27 | #include <sys/mman.h> |
| 28 | #include <sys/socket.h> |
| 29 | #include <sys/stat.h> |
| 30 | #include <sys/types.h> |
| 31 | #include <inttypes.h> |
| 32 | #include <unistd.h> |
| 33 | #include <urcu/list.h> |
| 34 | #include <signal.h> |
| 35 | |
| 36 | #include <bin/lttng-consumerd/health-consumerd.h> |
| 37 | #include <common/common.h> |
| 38 | #include <common/sessiond-comm/sessiond-comm.h> |
| 39 | #include <common/relayd/relayd.h> |
| 40 | #include <common/compat/fcntl.h> |
| 41 | #include <common/compat/endian.h> |
| 42 | #include <common/consumer/consumer-metadata-cache.h> |
| 43 | #include <common/consumer/consumer-stream.h> |
| 44 | #include <common/consumer/consumer-timer.h> |
| 45 | #include <common/utils.h> |
| 46 | #include <common/index/index.h> |
| 47 | |
| 48 | #include "ust-consumer.h" |
| 49 | |
| 50 | #define INT_MAX_STR_LEN 12 /* includes \0 */ |
| 51 | |
| 52 | extern struct lttng_consumer_global_data consumer_data; |
| 53 | extern int consumer_poll_timeout; |
| 54 | |
| 55 | /* |
| 56 | * Free channel object and all streams associated with it. This MUST be used |
| 57 | * only and only if the channel has _NEVER_ been added to the global channel |
| 58 | * hash table. |
| 59 | */ |
| 60 | static void destroy_channel(struct lttng_consumer_channel *channel) |
| 61 | { |
| 62 | struct lttng_consumer_stream *stream, *stmp; |
| 63 | |
| 64 | assert(channel); |
| 65 | |
| 66 | DBG("UST consumer cleaning stream list"); |
| 67 | |
| 68 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, |
| 69 | send_node) { |
| 70 | |
| 71 | health_code_update(); |
| 72 | |
| 73 | cds_list_del(&stream->send_node); |
| 74 | ustctl_destroy_stream(stream->ustream); |
| 75 | free(stream); |
| 76 | } |
| 77 | |
| 78 | /* |
| 79 | * If a channel is available meaning that was created before the streams |
| 80 | * were, delete it. |
| 81 | */ |
| 82 | if (channel->uchan) { |
| 83 | lttng_ustconsumer_del_channel(channel); |
| 84 | lttng_ustconsumer_free_channel(channel); |
| 85 | } |
| 86 | free(channel); |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * Add channel to internal consumer state. |
| 91 | * |
| 92 | * Returns 0 on success or else a negative value. |
| 93 | */ |
| 94 | static int add_channel(struct lttng_consumer_channel *channel, |
| 95 | struct lttng_consumer_local_data *ctx) |
| 96 | { |
| 97 | int ret = 0; |
| 98 | |
| 99 | assert(channel); |
| 100 | assert(ctx); |
| 101 | |
| 102 | if (ctx->on_recv_channel != NULL) { |
| 103 | ret = ctx->on_recv_channel(channel); |
| 104 | if (ret == 0) { |
| 105 | ret = consumer_add_channel(channel, ctx); |
| 106 | } else if (ret < 0) { |
| 107 | /* Most likely an ENOMEM. */ |
| 108 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
| 109 | goto error; |
| 110 | } |
| 111 | } else { |
| 112 | ret = consumer_add_channel(channel, ctx); |
| 113 | } |
| 114 | |
| 115 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
| 116 | |
| 117 | error: |
| 118 | return ret; |
| 119 | } |
| 120 | |
| 121 | /* |
| 122 | * Allocate and return a consumer channel object. |
| 123 | */ |
| 124 | static struct lttng_consumer_channel *allocate_channel(uint64_t session_id, |
| 125 | const char *pathname, const char *name, uid_t uid, gid_t gid, |
| 126 | uint64_t relayd_id, uint64_t key, enum lttng_event_output output, |
| 127 | uint64_t tracefile_size, uint64_t tracefile_count, |
| 128 | uint64_t session_id_per_pid, unsigned int monitor, |
| 129 | unsigned int live_timer_interval, |
| 130 | const char *root_shm_path, const char *shm_path) |
| 131 | { |
| 132 | assert(pathname); |
| 133 | assert(name); |
| 134 | |
| 135 | return consumer_allocate_channel(key, session_id, pathname, name, uid, |
| 136 | gid, relayd_id, output, tracefile_size, |
| 137 | tracefile_count, session_id_per_pid, monitor, |
| 138 | live_timer_interval, root_shm_path, shm_path); |
| 139 | } |
| 140 | |
| 141 | /* |
| 142 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the |
| 143 | * error value if applicable is set in it else it is kept untouched. |
| 144 | * |
| 145 | * Return NULL on error else the newly allocated stream object. |
| 146 | */ |
| 147 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
| 148 | struct lttng_consumer_channel *channel, |
| 149 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) |
| 150 | { |
| 151 | int alloc_ret; |
| 152 | struct lttng_consumer_stream *stream = NULL; |
| 153 | |
| 154 | assert(channel); |
| 155 | assert(ctx); |
| 156 | |
| 157 | stream = consumer_allocate_stream(channel->key, |
| 158 | key, |
| 159 | LTTNG_CONSUMER_ACTIVE_STREAM, |
| 160 | channel->name, |
| 161 | channel->uid, |
| 162 | channel->gid, |
| 163 | channel->relayd_id, |
| 164 | channel->session_id, |
| 165 | cpu, |
| 166 | &alloc_ret, |
| 167 | channel->type, |
| 168 | channel->monitor); |
| 169 | if (stream == NULL) { |
| 170 | switch (alloc_ret) { |
| 171 | case -ENOENT: |
| 172 | /* |
| 173 | * We could not find the channel. Can happen if cpu hotplug |
| 174 | * happens while tearing down. |
| 175 | */ |
| 176 | DBG3("Could not find channel"); |
| 177 | break; |
| 178 | case -ENOMEM: |
| 179 | case -EINVAL: |
| 180 | default: |
| 181 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
| 182 | break; |
| 183 | } |
| 184 | goto error; |
| 185 | } |
| 186 | |
| 187 | stream->chan = channel; |
| 188 | |
| 189 | error: |
| 190 | if (_alloc_ret) { |
| 191 | *_alloc_ret = alloc_ret; |
| 192 | } |
| 193 | return stream; |
| 194 | } |
| 195 | |
| 196 | /* |
| 197 | * Send the given stream pointer to the corresponding thread. |
| 198 | * |
| 199 | * Returns 0 on success else a negative value. |
| 200 | */ |
| 201 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, |
| 202 | struct lttng_consumer_local_data *ctx) |
| 203 | { |
| 204 | int ret; |
| 205 | struct lttng_pipe *stream_pipe; |
| 206 | |
| 207 | /* Get the right pipe where the stream will be sent. */ |
| 208 | if (stream->metadata_flag) { |
| 209 | ret = consumer_add_metadata_stream(stream); |
| 210 | if (ret) { |
| 211 | ERR("Consumer add metadata stream %" PRIu64 " failed.", |
| 212 | stream->key); |
| 213 | goto error; |
| 214 | } |
| 215 | stream_pipe = ctx->consumer_metadata_pipe; |
| 216 | } else { |
| 217 | ret = consumer_add_data_stream(stream); |
| 218 | if (ret) { |
| 219 | ERR("Consumer add stream %" PRIu64 " failed.", |
| 220 | stream->key); |
| 221 | goto error; |
| 222 | } |
| 223 | stream_pipe = ctx->consumer_data_pipe; |
| 224 | } |
| 225 | |
| 226 | /* |
| 227 | * From this point on, the stream's ownership has been moved away from |
| 228 | * the channel and becomes globally visible. |
| 229 | */ |
| 230 | stream->globally_visible = 1; |
| 231 | |
| 232 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
| 233 | if (ret < 0) { |
| 234 | ERR("Consumer write %s stream to pipe %d", |
| 235 | stream->metadata_flag ? "metadata" : "data", |
| 236 | lttng_pipe_get_writefd(stream_pipe)); |
| 237 | if (stream->metadata_flag) { |
| 238 | consumer_del_stream_for_metadata(stream); |
| 239 | } else { |
| 240 | consumer_del_stream_for_data(stream); |
| 241 | } |
| 242 | } |
| 243 | error: |
| 244 | return ret; |
| 245 | } |
| 246 | |
| 247 | static |
| 248 | int get_stream_shm_path(char *stream_shm_path, const char *shm_path, int cpu) |
| 249 | { |
| 250 | char cpu_nr[INT_MAX_STR_LEN]; /* int max len */ |
| 251 | int ret; |
| 252 | |
| 253 | strncpy(stream_shm_path, shm_path, PATH_MAX); |
| 254 | stream_shm_path[PATH_MAX - 1] = '\0'; |
| 255 | ret = snprintf(cpu_nr, INT_MAX_STR_LEN, "%i", cpu); |
| 256 | if (ret < 0) { |
| 257 | PERROR("snprintf"); |
| 258 | goto end; |
| 259 | } |
| 260 | strncat(stream_shm_path, cpu_nr, |
| 261 | PATH_MAX - strlen(stream_shm_path) - 1); |
| 262 | ret = 0; |
| 263 | end: |
| 264 | return ret; |
| 265 | } |
| 266 | |
| 267 | /* |
| 268 | * Create streams for the given channel using liblttng-ust-ctl. |
| 269 | * |
| 270 | * Return 0 on success else a negative value. |
| 271 | */ |
| 272 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
| 273 | struct lttng_consumer_local_data *ctx) |
| 274 | { |
| 275 | int ret, cpu = 0; |
| 276 | struct ustctl_consumer_stream *ustream; |
| 277 | struct lttng_consumer_stream *stream; |
| 278 | |
| 279 | assert(channel); |
| 280 | assert(ctx); |
| 281 | |
| 282 | /* |
| 283 | * While a stream is available from ustctl. When NULL is returned, we've |
| 284 | * reached the end of the possible stream for the channel. |
| 285 | */ |
| 286 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { |
| 287 | int wait_fd; |
| 288 | int ust_metadata_pipe[2]; |
| 289 | |
| 290 | health_code_update(); |
| 291 | |
| 292 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
| 293 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); |
| 294 | if (ret < 0) { |
| 295 | ERR("Create ust metadata poll pipe"); |
| 296 | goto error; |
| 297 | } |
| 298 | wait_fd = ust_metadata_pipe[0]; |
| 299 | } else { |
| 300 | wait_fd = ustctl_stream_get_wait_fd(ustream); |
| 301 | } |
| 302 | |
| 303 | /* Allocate consumer stream object. */ |
| 304 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); |
| 305 | if (!stream) { |
| 306 | goto error_alloc; |
| 307 | } |
| 308 | stream->ustream = ustream; |
| 309 | /* |
| 310 | * Store it so we can save multiple function calls afterwards since |
| 311 | * this value is used heavily in the stream threads. This is UST |
| 312 | * specific so this is why it's done after allocation. |
| 313 | */ |
| 314 | stream->wait_fd = wait_fd; |
| 315 | |
| 316 | /* |
| 317 | * Increment channel refcount since the channel reference has now been |
| 318 | * assigned in the allocation process above. |
| 319 | */ |
| 320 | if (stream->chan->monitor) { |
| 321 | uatomic_inc(&stream->chan->refcount); |
| 322 | } |
| 323 | |
| 324 | /* |
| 325 | * Order is important this is why a list is used. On error, the caller |
| 326 | * should clean this list. |
| 327 | */ |
| 328 | cds_list_add_tail(&stream->send_node, &channel->streams.head); |
| 329 | |
| 330 | ret = ustctl_get_max_subbuf_size(stream->ustream, |
| 331 | &stream->max_sb_size); |
| 332 | if (ret < 0) { |
| 333 | ERR("ustctl_get_max_subbuf_size failed for stream %s", |
| 334 | stream->name); |
| 335 | goto error; |
| 336 | } |
| 337 | |
| 338 | /* Do actions once stream has been received. */ |
| 339 | if (ctx->on_recv_stream) { |
| 340 | ret = ctx->on_recv_stream(stream); |
| 341 | if (ret < 0) { |
| 342 | goto error; |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
| 347 | stream->name, stream->key, stream->relayd_stream_id); |
| 348 | |
| 349 | /* Set next CPU stream. */ |
| 350 | channel->streams.count = ++cpu; |
| 351 | |
| 352 | /* Keep stream reference when creating metadata. */ |
| 353 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
| 354 | channel->metadata_stream = stream; |
| 355 | if (channel->monitor) { |
| 356 | /* Set metadata poll pipe if we created one */ |
| 357 | memcpy(stream->ust_metadata_poll_pipe, |
| 358 | ust_metadata_pipe, |
| 359 | sizeof(ust_metadata_pipe)); |
| 360 | } |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | return 0; |
| 365 | |
| 366 | error: |
| 367 | error_alloc: |
| 368 | return ret; |
| 369 | } |
| 370 | |
| 371 | /* |
| 372 | * create_posix_shm is never called concurrently within a process. |
| 373 | */ |
| 374 | static |
| 375 | int create_posix_shm(void) |
| 376 | { |
| 377 | char tmp_name[NAME_MAX]; |
| 378 | int shmfd, ret; |
| 379 | |
| 380 | ret = snprintf(tmp_name, NAME_MAX, "/ust-shm-consumer-%d", getpid()); |
| 381 | if (ret < 0) { |
| 382 | PERROR("snprintf"); |
| 383 | return -1; |
| 384 | } |
| 385 | /* |
| 386 | * Allocate shm, and immediately unlink its shm oject, keeping |
| 387 | * only the file descriptor as a reference to the object. |
| 388 | * We specifically do _not_ use the / at the beginning of the |
| 389 | * pathname so that some OS implementations can keep it local to |
| 390 | * the process (POSIX leaves this implementation-defined). |
| 391 | */ |
| 392 | shmfd = shm_open(tmp_name, O_CREAT | O_EXCL | O_RDWR, 0700); |
| 393 | if (shmfd < 0) { |
| 394 | PERROR("shm_open"); |
| 395 | goto error_shm_open; |
| 396 | } |
| 397 | ret = shm_unlink(tmp_name); |
| 398 | if (ret < 0 && errno != ENOENT) { |
| 399 | PERROR("shm_unlink"); |
| 400 | goto error_shm_release; |
| 401 | } |
| 402 | return shmfd; |
| 403 | |
| 404 | error_shm_release: |
| 405 | ret = close(shmfd); |
| 406 | if (ret) { |
| 407 | PERROR("close"); |
| 408 | } |
| 409 | error_shm_open: |
| 410 | return -1; |
| 411 | } |
| 412 | |
| 413 | static int open_ust_stream_fd(struct lttng_consumer_channel *channel, |
| 414 | struct ustctl_consumer_channel_attr *attr, |
| 415 | int cpu) |
| 416 | { |
| 417 | char shm_path[PATH_MAX]; |
| 418 | int ret; |
| 419 | |
| 420 | if (!channel->shm_path[0]) { |
| 421 | return create_posix_shm(); |
| 422 | } |
| 423 | ret = get_stream_shm_path(shm_path, channel->shm_path, cpu); |
| 424 | if (ret) { |
| 425 | goto error_shm_path; |
| 426 | } |
| 427 | return run_as_open(shm_path, |
| 428 | O_RDWR | O_CREAT | O_EXCL, S_IRUSR | S_IWUSR, |
| 429 | channel->uid, channel->gid); |
| 430 | |
| 431 | error_shm_path: |
| 432 | return -1; |
| 433 | } |
| 434 | |
| 435 | /* |
| 436 | * Create an UST channel with the given attributes and send it to the session |
| 437 | * daemon using the ust ctl API. |
| 438 | * |
| 439 | * Return 0 on success or else a negative value. |
| 440 | */ |
| 441 | static int create_ust_channel(struct lttng_consumer_channel *channel, |
| 442 | struct ustctl_consumer_channel_attr *attr, |
| 443 | struct ustctl_consumer_channel **ust_chanp) |
| 444 | { |
| 445 | int ret, nr_stream_fds, i, j; |
| 446 | int *stream_fds; |
| 447 | struct ustctl_consumer_channel *ust_channel; |
| 448 | |
| 449 | assert(channel); |
| 450 | assert(attr); |
| 451 | assert(ust_chanp); |
| 452 | |
| 453 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " |
| 454 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " |
| 455 | "switch_timer_interval: %u, read_timer_interval: %u, " |
| 456 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, |
| 457 | attr->num_subbuf, attr->switch_timer_interval, |
| 458 | attr->read_timer_interval, attr->output, attr->type); |
| 459 | |
| 460 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) |
| 461 | nr_stream_fds = 1; |
| 462 | else |
| 463 | nr_stream_fds = ustctl_get_nr_stream_per_channel(); |
| 464 | stream_fds = zmalloc(nr_stream_fds * sizeof(*stream_fds)); |
| 465 | if (!stream_fds) { |
| 466 | ret = -1; |
| 467 | goto error_alloc; |
| 468 | } |
| 469 | for (i = 0; i < nr_stream_fds; i++) { |
| 470 | stream_fds[i] = open_ust_stream_fd(channel, attr, i); |
| 471 | if (stream_fds[i] < 0) { |
| 472 | ret = -1; |
| 473 | goto error_open; |
| 474 | } |
| 475 | } |
| 476 | ust_channel = ustctl_create_channel(attr, stream_fds, nr_stream_fds); |
| 477 | if (!ust_channel) { |
| 478 | ret = -1; |
| 479 | goto error_create; |
| 480 | } |
| 481 | channel->nr_stream_fds = nr_stream_fds; |
| 482 | channel->stream_fds = stream_fds; |
| 483 | *ust_chanp = ust_channel; |
| 484 | |
| 485 | return 0; |
| 486 | |
| 487 | error_create: |
| 488 | error_open: |
| 489 | for (j = i - 1; j >= 0; j--) { |
| 490 | int closeret; |
| 491 | |
| 492 | closeret = close(stream_fds[j]); |
| 493 | if (closeret) { |
| 494 | PERROR("close"); |
| 495 | } |
| 496 | if (channel->shm_path[0]) { |
| 497 | char shm_path[PATH_MAX]; |
| 498 | |
| 499 | closeret = get_stream_shm_path(shm_path, |
| 500 | channel->shm_path, j); |
| 501 | if (closeret) { |
| 502 | ERR("Cannot get stream shm path"); |
| 503 | } |
| 504 | closeret = run_as_unlink(shm_path, |
| 505 | channel->uid, channel->gid); |
| 506 | if (closeret) { |
| 507 | PERROR("unlink %s", shm_path); |
| 508 | } |
| 509 | } |
| 510 | } |
| 511 | /* Try to rmdir all directories under shm_path root. */ |
| 512 | if (channel->root_shm_path[0]) { |
| 513 | (void) run_as_rmdir_recursive(channel->root_shm_path, |
| 514 | channel->uid, channel->gid); |
| 515 | } |
| 516 | free(stream_fds); |
| 517 | error_alloc: |
| 518 | return ret; |
| 519 | } |
| 520 | |
| 521 | /* |
| 522 | * Send a single given stream to the session daemon using the sock. |
| 523 | * |
| 524 | * Return 0 on success else a negative value. |
| 525 | */ |
| 526 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
| 527 | { |
| 528 | int ret; |
| 529 | |
| 530 | assert(stream); |
| 531 | assert(sock >= 0); |
| 532 | |
| 533 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
| 534 | |
| 535 | /* Send stream to session daemon. */ |
| 536 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); |
| 537 | if (ret < 0) { |
| 538 | goto error; |
| 539 | } |
| 540 | |
| 541 | error: |
| 542 | return ret; |
| 543 | } |
| 544 | |
| 545 | /* |
| 546 | * Send channel to sessiond. |
| 547 | * |
| 548 | * Return 0 on success or else a negative value. |
| 549 | */ |
| 550 | static int send_sessiond_channel(int sock, |
| 551 | struct lttng_consumer_channel *channel, |
| 552 | struct lttng_consumer_local_data *ctx, int *relayd_error) |
| 553 | { |
| 554 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
| 555 | struct lttng_consumer_stream *stream; |
| 556 | uint64_t net_seq_idx = -1ULL; |
| 557 | |
| 558 | assert(channel); |
| 559 | assert(ctx); |
| 560 | assert(sock >= 0); |
| 561 | |
| 562 | DBG("UST consumer sending channel %s to sessiond", channel->name); |
| 563 | |
| 564 | if (channel->relayd_id != (uint64_t) -1ULL) { |
| 565 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
| 566 | |
| 567 | health_code_update(); |
| 568 | |
| 569 | /* Try to send the stream to the relayd if one is available. */ |
| 570 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); |
| 571 | if (ret < 0) { |
| 572 | /* |
| 573 | * Flag that the relayd was the problem here probably due to a |
| 574 | * communicaton error on the socket. |
| 575 | */ |
| 576 | if (relayd_error) { |
| 577 | *relayd_error = 1; |
| 578 | } |
| 579 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
| 580 | } |
| 581 | if (net_seq_idx == -1ULL) { |
| 582 | net_seq_idx = stream->net_seq_idx; |
| 583 | } |
| 584 | } |
| 585 | } |
| 586 | |
| 587 | /* Inform sessiond that we are about to send channel and streams. */ |
| 588 | ret = consumer_send_status_msg(sock, ret_code); |
| 589 | if (ret < 0 || ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
| 590 | /* |
| 591 | * Either the session daemon is not responding or the relayd died so we |
| 592 | * stop now. |
| 593 | */ |
| 594 | goto error; |
| 595 | } |
| 596 | |
| 597 | /* Send channel to sessiond. */ |
| 598 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); |
| 599 | if (ret < 0) { |
| 600 | goto error; |
| 601 | } |
| 602 | |
| 603 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); |
| 604 | if (ret < 0) { |
| 605 | goto error; |
| 606 | } |
| 607 | |
| 608 | /* The channel was sent successfully to the sessiond at this point. */ |
| 609 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
| 610 | |
| 611 | health_code_update(); |
| 612 | |
| 613 | /* Send stream to session daemon. */ |
| 614 | ret = send_sessiond_stream(sock, stream); |
| 615 | if (ret < 0) { |
| 616 | goto error; |
| 617 | } |
| 618 | } |
| 619 | |
| 620 | /* Tell sessiond there is no more stream. */ |
| 621 | ret = ustctl_send_stream_to_sessiond(sock, NULL); |
| 622 | if (ret < 0) { |
| 623 | goto error; |
| 624 | } |
| 625 | |
| 626 | DBG("UST consumer NULL stream sent to sessiond"); |
| 627 | |
| 628 | return 0; |
| 629 | |
| 630 | error: |
| 631 | if (ret_code != LTTCOMM_CONSUMERD_SUCCESS) { |
| 632 | ret = -1; |
| 633 | } |
| 634 | return ret; |
| 635 | } |
| 636 | |
| 637 | /* |
| 638 | * Creates a channel and streams and add the channel it to the channel internal |
| 639 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is |
| 640 | * received. |
| 641 | * |
| 642 | * Return 0 on success or else, a negative value is returned and the channel |
| 643 | * MUST be destroyed by consumer_del_channel(). |
| 644 | */ |
| 645 | static int ask_channel(struct lttng_consumer_local_data *ctx, int sock, |
| 646 | struct lttng_consumer_channel *channel, |
| 647 | struct ustctl_consumer_channel_attr *attr) |
| 648 | { |
| 649 | int ret; |
| 650 | |
| 651 | assert(ctx); |
| 652 | assert(channel); |
| 653 | assert(attr); |
| 654 | |
| 655 | /* |
| 656 | * This value is still used by the kernel consumer since for the kernel, |
| 657 | * the stream ownership is not IN the consumer so we need to have the |
| 658 | * number of left stream that needs to be initialized so we can know when |
| 659 | * to delete the channel (see consumer.c). |
| 660 | * |
| 661 | * As for the user space tracer now, the consumer creates and sends the |
| 662 | * stream to the session daemon which only sends them to the application |
| 663 | * once every stream of a channel is received making this value useless |
| 664 | * because we they will be added to the poll thread before the application |
| 665 | * receives them. This ensures that a stream can not hang up during |
| 666 | * initilization of a channel. |
| 667 | */ |
| 668 | channel->nb_init_stream_left = 0; |
| 669 | |
| 670 | /* The reply msg status is handled in the following call. */ |
| 671 | ret = create_ust_channel(channel, attr, &channel->uchan); |
| 672 | if (ret < 0) { |
| 673 | goto end; |
| 674 | } |
| 675 | |
| 676 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
| 677 | |
| 678 | /* |
| 679 | * For the snapshots (no monitor), we create the metadata streams |
| 680 | * on demand, not during the channel creation. |
| 681 | */ |
| 682 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { |
| 683 | ret = 0; |
| 684 | goto end; |
| 685 | } |
| 686 | |
| 687 | /* Open all streams for this channel. */ |
| 688 | ret = create_ust_streams(channel, ctx); |
| 689 | if (ret < 0) { |
| 690 | goto end; |
| 691 | } |
| 692 | |
| 693 | end: |
| 694 | return ret; |
| 695 | } |
| 696 | |
| 697 | /* |
| 698 | * Send all stream of a channel to the right thread handling it. |
| 699 | * |
| 700 | * On error, return a negative value else 0 on success. |
| 701 | */ |
| 702 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, |
| 703 | struct lttng_consumer_local_data *ctx) |
| 704 | { |
| 705 | int ret = 0; |
| 706 | struct lttng_consumer_stream *stream, *stmp; |
| 707 | |
| 708 | assert(channel); |
| 709 | assert(ctx); |
| 710 | |
| 711 | /* Send streams to the corresponding thread. */ |
| 712 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, |
| 713 | send_node) { |
| 714 | |
| 715 | health_code_update(); |
| 716 | |
| 717 | /* Sending the stream to the thread. */ |
| 718 | ret = send_stream_to_thread(stream, ctx); |
| 719 | if (ret < 0) { |
| 720 | /* |
| 721 | * If we are unable to send the stream to the thread, there is |
| 722 | * a big problem so just stop everything. |
| 723 | */ |
| 724 | /* Remove node from the channel stream list. */ |
| 725 | cds_list_del(&stream->send_node); |
| 726 | goto error; |
| 727 | } |
| 728 | |
| 729 | /* Remove node from the channel stream list. */ |
| 730 | cds_list_del(&stream->send_node); |
| 731 | |
| 732 | } |
| 733 | |
| 734 | error: |
| 735 | return ret; |
| 736 | } |
| 737 | |
| 738 | /* |
| 739 | * Flush channel's streams using the given key to retrieve the channel. |
| 740 | * |
| 741 | * Return 0 on success else an LTTng error code. |
| 742 | */ |
| 743 | static int flush_channel(uint64_t chan_key) |
| 744 | { |
| 745 | int ret = 0; |
| 746 | struct lttng_consumer_channel *channel; |
| 747 | struct lttng_consumer_stream *stream; |
| 748 | struct lttng_ht *ht; |
| 749 | struct lttng_ht_iter iter; |
| 750 | |
| 751 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
| 752 | |
| 753 | rcu_read_lock(); |
| 754 | channel = consumer_find_channel(chan_key); |
| 755 | if (!channel) { |
| 756 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
| 757 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 758 | goto error; |
| 759 | } |
| 760 | |
| 761 | ht = consumer_data.stream_per_chan_id_ht; |
| 762 | |
| 763 | /* For each stream of the channel id, flush it. */ |
| 764 | cds_lfht_for_each_entry_duplicate(ht->ht, |
| 765 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, |
| 766 | &channel->key, &iter.iter, stream, node_channel_id.node) { |
| 767 | |
| 768 | health_code_update(); |
| 769 | |
| 770 | pthread_mutex_lock(&stream->lock); |
| 771 | if (!stream->quiescent) { |
| 772 | ustctl_flush_buffer(stream->ustream, 0); |
| 773 | stream->quiescent = true; |
| 774 | } |
| 775 | pthread_mutex_unlock(&stream->lock); |
| 776 | } |
| 777 | error: |
| 778 | rcu_read_unlock(); |
| 779 | return ret; |
| 780 | } |
| 781 | |
| 782 | /* |
| 783 | * Clear quiescent state from channel's streams using the given key to |
| 784 | * retrieve the channel. |
| 785 | * |
| 786 | * Return 0 on success else an LTTng error code. |
| 787 | */ |
| 788 | static int clear_quiescent_channel(uint64_t chan_key) |
| 789 | { |
| 790 | int ret = 0; |
| 791 | struct lttng_consumer_channel *channel; |
| 792 | struct lttng_consumer_stream *stream; |
| 793 | struct lttng_ht *ht; |
| 794 | struct lttng_ht_iter iter; |
| 795 | |
| 796 | DBG("UST consumer clear quiescent channel key %" PRIu64, chan_key); |
| 797 | |
| 798 | rcu_read_lock(); |
| 799 | channel = consumer_find_channel(chan_key); |
| 800 | if (!channel) { |
| 801 | ERR("UST consumer clear quiescent channel %" PRIu64 " not found", chan_key); |
| 802 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 803 | goto error; |
| 804 | } |
| 805 | |
| 806 | ht = consumer_data.stream_per_chan_id_ht; |
| 807 | |
| 808 | /* For each stream of the channel id, clear quiescent state. */ |
| 809 | cds_lfht_for_each_entry_duplicate(ht->ht, |
| 810 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, |
| 811 | &channel->key, &iter.iter, stream, node_channel_id.node) { |
| 812 | |
| 813 | health_code_update(); |
| 814 | |
| 815 | pthread_mutex_lock(&stream->lock); |
| 816 | stream->quiescent = false; |
| 817 | pthread_mutex_unlock(&stream->lock); |
| 818 | } |
| 819 | error: |
| 820 | rcu_read_unlock(); |
| 821 | return ret; |
| 822 | } |
| 823 | |
| 824 | /* |
| 825 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. |
| 826 | * RCU read side lock MUST be acquired before calling this function. |
| 827 | * |
| 828 | * Return 0 on success else an LTTng error code. |
| 829 | */ |
| 830 | static int close_metadata(uint64_t chan_key) |
| 831 | { |
| 832 | int ret = 0; |
| 833 | struct lttng_consumer_channel *channel; |
| 834 | unsigned int channel_monitor; |
| 835 | |
| 836 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
| 837 | |
| 838 | channel = consumer_find_channel(chan_key); |
| 839 | if (!channel) { |
| 840 | /* |
| 841 | * This is possible if the metadata thread has issue a delete because |
| 842 | * the endpoint point of the stream hung up. There is no way the |
| 843 | * session daemon can know about it thus use a DBG instead of an actual |
| 844 | * error. |
| 845 | */ |
| 846 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); |
| 847 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 848 | goto error; |
| 849 | } |
| 850 | |
| 851 | pthread_mutex_lock(&consumer_data.lock); |
| 852 | pthread_mutex_lock(&channel->lock); |
| 853 | channel_monitor = channel->monitor; |
| 854 | if (cds_lfht_is_node_deleted(&channel->node.node)) { |
| 855 | goto error_unlock; |
| 856 | } |
| 857 | |
| 858 | lttng_ustconsumer_close_metadata(channel); |
| 859 | pthread_mutex_unlock(&channel->lock); |
| 860 | pthread_mutex_unlock(&consumer_data.lock); |
| 861 | |
| 862 | /* |
| 863 | * The ownership of a metadata channel depends on the type of |
| 864 | * session to which it belongs. In effect, the monitor flag is checked |
| 865 | * to determine if this metadata channel is in "snapshot" mode or not. |
| 866 | * |
| 867 | * In the non-snapshot case, the metadata channel is created along with |
| 868 | * a single stream which will remain present until the metadata channel |
| 869 | * is destroyed (on the destruction of its session). In this case, the |
| 870 | * metadata stream in "monitored" by the metadata poll thread and holds |
| 871 | * the ownership of its channel. |
| 872 | * |
| 873 | * Closing the metadata will cause the metadata stream's "metadata poll |
| 874 | * pipe" to be closed. Closing this pipe will wake-up the metadata poll |
| 875 | * thread which will teardown the metadata stream which, in return, |
| 876 | * deletes the metadata channel. |
| 877 | * |
| 878 | * In the snapshot case, the metadata stream is created and destroyed |
| 879 | * on every snapshot record. Since the channel doesn't have an owner |
| 880 | * other than the session daemon, it is safe to destroy it immediately |
| 881 | * on reception of the CLOSE_METADATA command. |
| 882 | */ |
| 883 | if (!channel_monitor) { |
| 884 | /* |
| 885 | * The channel and consumer_data locks must be |
| 886 | * released before this call since consumer_del_channel |
| 887 | * re-acquires the channel and consumer_data locks to teardown |
| 888 | * the channel and queue its reclamation by the "call_rcu" |
| 889 | * worker thread. |
| 890 | */ |
| 891 | consumer_del_channel(channel); |
| 892 | } |
| 893 | |
| 894 | return ret; |
| 895 | error_unlock: |
| 896 | pthread_mutex_unlock(&channel->lock); |
| 897 | pthread_mutex_unlock(&consumer_data.lock); |
| 898 | error: |
| 899 | return ret; |
| 900 | } |
| 901 | |
| 902 | /* |
| 903 | * RCU read side lock MUST be acquired before calling this function. |
| 904 | * |
| 905 | * Return 0 on success else an LTTng error code. |
| 906 | */ |
| 907 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) |
| 908 | { |
| 909 | int ret; |
| 910 | struct lttng_consumer_channel *metadata; |
| 911 | |
| 912 | DBG("UST consumer setup metadata key %" PRIu64, key); |
| 913 | |
| 914 | metadata = consumer_find_channel(key); |
| 915 | if (!metadata) { |
| 916 | ERR("UST consumer push metadata %" PRIu64 " not found", key); |
| 917 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 918 | goto end; |
| 919 | } |
| 920 | |
| 921 | /* |
| 922 | * In no monitor mode, the metadata channel has no stream(s) so skip the |
| 923 | * ownership transfer to the metadata thread. |
| 924 | */ |
| 925 | if (!metadata->monitor) { |
| 926 | DBG("Metadata channel in no monitor"); |
| 927 | ret = 0; |
| 928 | goto end; |
| 929 | } |
| 930 | |
| 931 | /* |
| 932 | * Send metadata stream to relayd if one available. Availability is |
| 933 | * known if the stream is still in the list of the channel. |
| 934 | */ |
| 935 | if (cds_list_empty(&metadata->streams.head)) { |
| 936 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); |
| 937 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; |
| 938 | goto error_no_stream; |
| 939 | } |
| 940 | |
| 941 | /* Send metadata stream to relayd if needed. */ |
| 942 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
| 943 | ret = consumer_send_relayd_stream(metadata->metadata_stream, |
| 944 | metadata->pathname); |
| 945 | if (ret < 0) { |
| 946 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; |
| 947 | goto error; |
| 948 | } |
| 949 | ret = consumer_send_relayd_streams_sent( |
| 950 | metadata->metadata_stream->net_seq_idx); |
| 951 | if (ret < 0) { |
| 952 | ret = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
| 953 | goto error; |
| 954 | } |
| 955 | } |
| 956 | |
| 957 | ret = send_streams_to_thread(metadata, ctx); |
| 958 | if (ret < 0) { |
| 959 | /* |
| 960 | * If we are unable to send the stream to the thread, there is |
| 961 | * a big problem so just stop everything. |
| 962 | */ |
| 963 | ret = LTTCOMM_CONSUMERD_FATAL; |
| 964 | goto error; |
| 965 | } |
| 966 | /* List MUST be empty after or else it could be reused. */ |
| 967 | assert(cds_list_empty(&metadata->streams.head)); |
| 968 | |
| 969 | ret = 0; |
| 970 | goto end; |
| 971 | |
| 972 | error: |
| 973 | /* |
| 974 | * Delete metadata channel on error. At this point, the metadata stream can |
| 975 | * NOT be monitored by the metadata thread thus having the guarantee that |
| 976 | * the stream is still in the local stream list of the channel. This call |
| 977 | * will make sure to clean that list. |
| 978 | */ |
| 979 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
| 980 | cds_list_del(&metadata->metadata_stream->send_node); |
| 981 | metadata->metadata_stream = NULL; |
| 982 | error_no_stream: |
| 983 | end: |
| 984 | return ret; |
| 985 | } |
| 986 | |
| 987 | /* |
| 988 | * Snapshot the whole metadata. |
| 989 | * |
| 990 | * Returns 0 on success, < 0 on error |
| 991 | */ |
| 992 | static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id, |
| 993 | struct lttng_consumer_local_data *ctx) |
| 994 | { |
| 995 | int ret = 0; |
| 996 | struct lttng_consumer_channel *metadata_channel; |
| 997 | struct lttng_consumer_stream *metadata_stream; |
| 998 | |
| 999 | assert(path); |
| 1000 | assert(ctx); |
| 1001 | |
| 1002 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", |
| 1003 | key, path); |
| 1004 | |
| 1005 | rcu_read_lock(); |
| 1006 | |
| 1007 | metadata_channel = consumer_find_channel(key); |
| 1008 | if (!metadata_channel) { |
| 1009 | ERR("UST snapshot metadata channel not found for key %" PRIu64, |
| 1010 | key); |
| 1011 | ret = -1; |
| 1012 | goto error; |
| 1013 | } |
| 1014 | assert(!metadata_channel->monitor); |
| 1015 | |
| 1016 | health_code_update(); |
| 1017 | |
| 1018 | /* |
| 1019 | * Ask the sessiond if we have new metadata waiting and update the |
| 1020 | * consumer metadata cache. |
| 1021 | */ |
| 1022 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0, 1); |
| 1023 | if (ret < 0) { |
| 1024 | goto error; |
| 1025 | } |
| 1026 | |
| 1027 | health_code_update(); |
| 1028 | |
| 1029 | /* |
| 1030 | * The metadata stream is NOT created in no monitor mode when the channel |
| 1031 | * is created on a sessiond ask channel command. |
| 1032 | */ |
| 1033 | ret = create_ust_streams(metadata_channel, ctx); |
| 1034 | if (ret < 0) { |
| 1035 | goto error; |
| 1036 | } |
| 1037 | |
| 1038 | metadata_stream = metadata_channel->metadata_stream; |
| 1039 | assert(metadata_stream); |
| 1040 | |
| 1041 | if (relayd_id != (uint64_t) -1ULL) { |
| 1042 | metadata_stream->net_seq_idx = relayd_id; |
| 1043 | ret = consumer_send_relayd_stream(metadata_stream, path); |
| 1044 | if (ret < 0) { |
| 1045 | goto error_stream; |
| 1046 | } |
| 1047 | } else { |
| 1048 | ret = utils_create_stream_file(path, metadata_stream->name, |
| 1049 | metadata_stream->chan->tracefile_size, |
| 1050 | metadata_stream->tracefile_count_current, |
| 1051 | metadata_stream->uid, metadata_stream->gid, NULL); |
| 1052 | if (ret < 0) { |
| 1053 | goto error_stream; |
| 1054 | } |
| 1055 | metadata_stream->out_fd = ret; |
| 1056 | metadata_stream->tracefile_size_current = 0; |
| 1057 | } |
| 1058 | |
| 1059 | do { |
| 1060 | health_code_update(); |
| 1061 | |
| 1062 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); |
| 1063 | if (ret < 0) { |
| 1064 | goto error_stream; |
| 1065 | } |
| 1066 | } while (ret > 0); |
| 1067 | |
| 1068 | error_stream: |
| 1069 | /* |
| 1070 | * Clean up the stream completly because the next snapshot will use a new |
| 1071 | * metadata stream. |
| 1072 | */ |
| 1073 | consumer_stream_destroy(metadata_stream, NULL); |
| 1074 | cds_list_del(&metadata_stream->send_node); |
| 1075 | metadata_channel->metadata_stream = NULL; |
| 1076 | |
| 1077 | error: |
| 1078 | rcu_read_unlock(); |
| 1079 | return ret; |
| 1080 | } |
| 1081 | |
| 1082 | /* |
| 1083 | * Take a snapshot of all the stream of a channel. |
| 1084 | * |
| 1085 | * Returns 0 on success, < 0 on error |
| 1086 | */ |
| 1087 | static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id, |
| 1088 | uint64_t nb_packets_per_stream, struct lttng_consumer_local_data *ctx) |
| 1089 | { |
| 1090 | int ret; |
| 1091 | unsigned use_relayd = 0; |
| 1092 | unsigned long consumed_pos, produced_pos; |
| 1093 | struct lttng_consumer_channel *channel; |
| 1094 | struct lttng_consumer_stream *stream; |
| 1095 | |
| 1096 | assert(path); |
| 1097 | assert(ctx); |
| 1098 | |
| 1099 | rcu_read_lock(); |
| 1100 | |
| 1101 | if (relayd_id != (uint64_t) -1ULL) { |
| 1102 | use_relayd = 1; |
| 1103 | } |
| 1104 | |
| 1105 | channel = consumer_find_channel(key); |
| 1106 | if (!channel) { |
| 1107 | ERR("UST snapshot channel not found for key %" PRIu64, key); |
| 1108 | ret = -1; |
| 1109 | goto error; |
| 1110 | } |
| 1111 | assert(!channel->monitor); |
| 1112 | DBG("UST consumer snapshot channel %" PRIu64, key); |
| 1113 | |
| 1114 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
| 1115 | health_code_update(); |
| 1116 | |
| 1117 | /* Lock stream because we are about to change its state. */ |
| 1118 | pthread_mutex_lock(&stream->lock); |
| 1119 | stream->net_seq_idx = relayd_id; |
| 1120 | |
| 1121 | if (use_relayd) { |
| 1122 | ret = consumer_send_relayd_stream(stream, path); |
| 1123 | if (ret < 0) { |
| 1124 | goto error_unlock; |
| 1125 | } |
| 1126 | } else { |
| 1127 | ret = utils_create_stream_file(path, stream->name, |
| 1128 | stream->chan->tracefile_size, |
| 1129 | stream->tracefile_count_current, |
| 1130 | stream->uid, stream->gid, NULL); |
| 1131 | if (ret < 0) { |
| 1132 | goto error_unlock; |
| 1133 | } |
| 1134 | stream->out_fd = ret; |
| 1135 | stream->tracefile_size_current = 0; |
| 1136 | |
| 1137 | DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path, |
| 1138 | stream->name, stream->key); |
| 1139 | } |
| 1140 | |
| 1141 | /* |
| 1142 | * If tracing is active, we want to perform a "full" buffer flush. |
| 1143 | * Else, if quiescent, it has already been done by the prior stop. |
| 1144 | */ |
| 1145 | if (!stream->quiescent) { |
| 1146 | ustctl_flush_buffer(stream->ustream, 0); |
| 1147 | } |
| 1148 | |
| 1149 | ret = lttng_ustconsumer_take_snapshot(stream); |
| 1150 | if (ret < 0) { |
| 1151 | ERR("Taking UST snapshot"); |
| 1152 | goto error_unlock; |
| 1153 | } |
| 1154 | |
| 1155 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); |
| 1156 | if (ret < 0) { |
| 1157 | ERR("Produced UST snapshot position"); |
| 1158 | goto error_unlock; |
| 1159 | } |
| 1160 | |
| 1161 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); |
| 1162 | if (ret < 0) { |
| 1163 | ERR("Consumerd UST snapshot position"); |
| 1164 | goto error_unlock; |
| 1165 | } |
| 1166 | |
| 1167 | /* |
| 1168 | * The original value is sent back if max stream size is larger than |
| 1169 | * the possible size of the snapshot. Also, we assume that the session |
| 1170 | * daemon should never send a maximum stream size that is lower than |
| 1171 | * subbuffer size. |
| 1172 | */ |
| 1173 | consumed_pos = consumer_get_consume_start_pos(consumed_pos, |
| 1174 | produced_pos, nb_packets_per_stream, |
| 1175 | stream->max_sb_size); |
| 1176 | |
| 1177 | while (consumed_pos < produced_pos) { |
| 1178 | ssize_t read_len; |
| 1179 | unsigned long len, padded_len; |
| 1180 | |
| 1181 | health_code_update(); |
| 1182 | |
| 1183 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
| 1184 | |
| 1185 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); |
| 1186 | if (ret < 0) { |
| 1187 | if (ret != -EAGAIN) { |
| 1188 | PERROR("ustctl_get_subbuf snapshot"); |
| 1189 | goto error_close_stream; |
| 1190 | } |
| 1191 | DBG("UST consumer get subbuf failed. Skipping it."); |
| 1192 | consumed_pos += stream->max_sb_size; |
| 1193 | stream->chan->lost_packets++; |
| 1194 | continue; |
| 1195 | } |
| 1196 | |
| 1197 | ret = ustctl_get_subbuf_size(stream->ustream, &len); |
| 1198 | if (ret < 0) { |
| 1199 | ERR("Snapshot ustctl_get_subbuf_size"); |
| 1200 | goto error_put_subbuf; |
| 1201 | } |
| 1202 | |
| 1203 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); |
| 1204 | if (ret < 0) { |
| 1205 | ERR("Snapshot ustctl_get_padded_subbuf_size"); |
| 1206 | goto error_put_subbuf; |
| 1207 | } |
| 1208 | |
| 1209 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, |
| 1210 | padded_len - len, NULL); |
| 1211 | if (use_relayd) { |
| 1212 | if (read_len != len) { |
| 1213 | ret = -EPERM; |
| 1214 | goto error_put_subbuf; |
| 1215 | } |
| 1216 | } else { |
| 1217 | if (read_len != padded_len) { |
| 1218 | ret = -EPERM; |
| 1219 | goto error_put_subbuf; |
| 1220 | } |
| 1221 | } |
| 1222 | |
| 1223 | ret = ustctl_put_subbuf(stream->ustream); |
| 1224 | if (ret < 0) { |
| 1225 | ERR("Snapshot ustctl_put_subbuf"); |
| 1226 | goto error_close_stream; |
| 1227 | } |
| 1228 | consumed_pos += stream->max_sb_size; |
| 1229 | } |
| 1230 | |
| 1231 | /* Simply close the stream so we can use it on the next snapshot. */ |
| 1232 | consumer_stream_close(stream); |
| 1233 | pthread_mutex_unlock(&stream->lock); |
| 1234 | } |
| 1235 | |
| 1236 | rcu_read_unlock(); |
| 1237 | return 0; |
| 1238 | |
| 1239 | error_put_subbuf: |
| 1240 | if (ustctl_put_subbuf(stream->ustream) < 0) { |
| 1241 | ERR("Snapshot ustctl_put_subbuf"); |
| 1242 | } |
| 1243 | error_close_stream: |
| 1244 | consumer_stream_close(stream); |
| 1245 | error_unlock: |
| 1246 | pthread_mutex_unlock(&stream->lock); |
| 1247 | error: |
| 1248 | rcu_read_unlock(); |
| 1249 | return ret; |
| 1250 | } |
| 1251 | |
| 1252 | /* |
| 1253 | * Receive the metadata updates from the sessiond. Supports receiving |
| 1254 | * overlapping metadata, but is needs to always belong to a contiguous |
| 1255 | * range starting from 0. |
| 1256 | * Be careful about the locks held when calling this function: it needs |
| 1257 | * the metadata cache flush to concurrently progress in order to |
| 1258 | * complete. |
| 1259 | */ |
| 1260 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, |
| 1261 | uint64_t len, uint64_t version, |
| 1262 | struct lttng_consumer_channel *channel, int timer, int wait) |
| 1263 | { |
| 1264 | int ret, ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
| 1265 | char *metadata_str; |
| 1266 | |
| 1267 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
| 1268 | |
| 1269 | metadata_str = zmalloc(len * sizeof(char)); |
| 1270 | if (!metadata_str) { |
| 1271 | PERROR("zmalloc metadata string"); |
| 1272 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
| 1273 | goto end; |
| 1274 | } |
| 1275 | |
| 1276 | health_code_update(); |
| 1277 | |
| 1278 | /* Receive metadata string. */ |
| 1279 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); |
| 1280 | if (ret < 0) { |
| 1281 | /* Session daemon is dead so return gracefully. */ |
| 1282 | ret_code = ret; |
| 1283 | goto end_free; |
| 1284 | } |
| 1285 | |
| 1286 | health_code_update(); |
| 1287 | |
| 1288 | pthread_mutex_lock(&channel->metadata_cache->lock); |
| 1289 | ret = consumer_metadata_cache_write(channel, offset, len, version, |
| 1290 | metadata_str); |
| 1291 | if (ret < 0) { |
| 1292 | /* Unable to handle metadata. Notify session daemon. */ |
| 1293 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
| 1294 | /* |
| 1295 | * Skip metadata flush on write error since the offset and len might |
| 1296 | * not have been updated which could create an infinite loop below when |
| 1297 | * waiting for the metadata cache to be flushed. |
| 1298 | */ |
| 1299 | pthread_mutex_unlock(&channel->metadata_cache->lock); |
| 1300 | goto end_free; |
| 1301 | } |
| 1302 | pthread_mutex_unlock(&channel->metadata_cache->lock); |
| 1303 | |
| 1304 | if (!wait) { |
| 1305 | goto end_free; |
| 1306 | } |
| 1307 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
| 1308 | DBG("Waiting for metadata to be flushed"); |
| 1309 | |
| 1310 | health_code_update(); |
| 1311 | |
| 1312 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
| 1313 | } |
| 1314 | |
| 1315 | end_free: |
| 1316 | free(metadata_str); |
| 1317 | end: |
| 1318 | return ret_code; |
| 1319 | } |
| 1320 | |
| 1321 | /* |
| 1322 | * Receive command from session daemon and process it. |
| 1323 | * |
| 1324 | * Return 1 on success else a negative value or 0. |
| 1325 | */ |
| 1326 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
| 1327 | int sock, struct pollfd *consumer_sockpoll) |
| 1328 | { |
| 1329 | ssize_t ret; |
| 1330 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
| 1331 | struct lttcomm_consumer_msg msg; |
| 1332 | struct lttng_consumer_channel *channel = NULL; |
| 1333 | |
| 1334 | health_code_update(); |
| 1335 | |
| 1336 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
| 1337 | if (ret != sizeof(msg)) { |
| 1338 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
| 1339 | ret, sizeof(msg)); |
| 1340 | /* |
| 1341 | * The ret value might 0 meaning an orderly shutdown but this is ok |
| 1342 | * since the caller handles this. |
| 1343 | */ |
| 1344 | if (ret > 0) { |
| 1345 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
| 1346 | ret = -1; |
| 1347 | } |
| 1348 | return ret; |
| 1349 | } |
| 1350 | |
| 1351 | health_code_update(); |
| 1352 | |
| 1353 | /* deprecated */ |
| 1354 | assert(msg.cmd_type != LTTNG_CONSUMER_STOP); |
| 1355 | |
| 1356 | health_code_update(); |
| 1357 | |
| 1358 | /* relayd needs RCU read-side lock */ |
| 1359 | rcu_read_lock(); |
| 1360 | |
| 1361 | switch (msg.cmd_type) { |
| 1362 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
| 1363 | { |
| 1364 | /* Session daemon status message are handled in the following call. */ |
| 1365 | consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
| 1366 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
| 1367 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id, |
| 1368 | msg.u.relayd_sock.relayd_session_id); |
| 1369 | goto end_nosignal; |
| 1370 | } |
| 1371 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
| 1372 | { |
| 1373 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
| 1374 | struct consumer_relayd_sock_pair *relayd; |
| 1375 | |
| 1376 | DBG("UST consumer destroying relayd %" PRIu64, index); |
| 1377 | |
| 1378 | /* Get relayd reference if exists. */ |
| 1379 | relayd = consumer_find_relayd(index); |
| 1380 | if (relayd == NULL) { |
| 1381 | DBG("Unable to find relayd %" PRIu64, index); |
| 1382 | ret_code = LTTCOMM_CONSUMERD_RELAYD_FAIL; |
| 1383 | } |
| 1384 | |
| 1385 | /* |
| 1386 | * Each relayd socket pair has a refcount of stream attached to it |
| 1387 | * which tells if the relayd is still active or not depending on the |
| 1388 | * refcount value. |
| 1389 | * |
| 1390 | * This will set the destroy flag of the relayd object and destroy it |
| 1391 | * if the refcount reaches zero when called. |
| 1392 | * |
| 1393 | * The destroy can happen either here or when a stream fd hangs up. |
| 1394 | */ |
| 1395 | if (relayd) { |
| 1396 | consumer_flag_relayd_for_destroy(relayd); |
| 1397 | } |
| 1398 | |
| 1399 | goto end_msg_sessiond; |
| 1400 | } |
| 1401 | case LTTNG_CONSUMER_UPDATE_STREAM: |
| 1402 | { |
| 1403 | rcu_read_unlock(); |
| 1404 | return -ENOSYS; |
| 1405 | } |
| 1406 | case LTTNG_CONSUMER_DATA_PENDING: |
| 1407 | { |
| 1408 | int ret, is_data_pending; |
| 1409 | uint64_t id = msg.u.data_pending.session_id; |
| 1410 | |
| 1411 | DBG("UST consumer data pending command for id %" PRIu64, id); |
| 1412 | |
| 1413 | is_data_pending = consumer_data_pending(id); |
| 1414 | |
| 1415 | /* Send back returned value to session daemon */ |
| 1416 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
| 1417 | sizeof(is_data_pending)); |
| 1418 | if (ret < 0) { |
| 1419 | DBG("Error when sending the data pending ret code: %d", ret); |
| 1420 | goto error_fatal; |
| 1421 | } |
| 1422 | |
| 1423 | /* |
| 1424 | * No need to send back a status message since the data pending |
| 1425 | * returned value is the response. |
| 1426 | */ |
| 1427 | break; |
| 1428 | } |
| 1429 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
| 1430 | { |
| 1431 | int ret; |
| 1432 | struct ustctl_consumer_channel_attr attr; |
| 1433 | |
| 1434 | /* Create a plain object and reserve a channel key. */ |
| 1435 | channel = allocate_channel(msg.u.ask_channel.session_id, |
| 1436 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, |
| 1437 | msg.u.ask_channel.uid, msg.u.ask_channel.gid, |
| 1438 | msg.u.ask_channel.relayd_id, msg.u.ask_channel.key, |
| 1439 | (enum lttng_event_output) msg.u.ask_channel.output, |
| 1440 | msg.u.ask_channel.tracefile_size, |
| 1441 | msg.u.ask_channel.tracefile_count, |
| 1442 | msg.u.ask_channel.session_id_per_pid, |
| 1443 | msg.u.ask_channel.monitor, |
| 1444 | msg.u.ask_channel.live_timer_interval, |
| 1445 | msg.u.ask_channel.root_shm_path, |
| 1446 | msg.u.ask_channel.shm_path); |
| 1447 | if (!channel) { |
| 1448 | goto end_channel_error; |
| 1449 | } |
| 1450 | |
| 1451 | /* |
| 1452 | * Assign UST application UID to the channel. This value is ignored for |
| 1453 | * per PID buffers. This is specific to UST thus setting this after the |
| 1454 | * allocation. |
| 1455 | */ |
| 1456 | channel->ust_app_uid = msg.u.ask_channel.ust_app_uid; |
| 1457 | |
| 1458 | /* Build channel attributes from received message. */ |
| 1459 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; |
| 1460 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; |
| 1461 | attr.overwrite = msg.u.ask_channel.overwrite; |
| 1462 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; |
| 1463 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; |
| 1464 | attr.chan_id = msg.u.ask_channel.chan_id; |
| 1465 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
| 1466 | attr.blocking_timeout= msg.u.ask_channel.blocking_timeout; |
| 1467 | |
| 1468 | /* Match channel buffer type to the UST abi. */ |
| 1469 | switch (msg.u.ask_channel.output) { |
| 1470 | case LTTNG_EVENT_MMAP: |
| 1471 | default: |
| 1472 | attr.output = LTTNG_UST_MMAP; |
| 1473 | break; |
| 1474 | } |
| 1475 | |
| 1476 | /* Translate and save channel type. */ |
| 1477 | switch (msg.u.ask_channel.type) { |
| 1478 | case LTTNG_UST_CHAN_PER_CPU: |
| 1479 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; |
| 1480 | attr.type = LTTNG_UST_CHAN_PER_CPU; |
| 1481 | /* |
| 1482 | * Set refcount to 1 for owner. Below, we will |
| 1483 | * pass ownership to the |
| 1484 | * consumer_thread_channel_poll() thread. |
| 1485 | */ |
| 1486 | channel->refcount = 1; |
| 1487 | break; |
| 1488 | case LTTNG_UST_CHAN_METADATA: |
| 1489 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; |
| 1490 | attr.type = LTTNG_UST_CHAN_METADATA; |
| 1491 | break; |
| 1492 | default: |
| 1493 | assert(0); |
| 1494 | goto error_fatal; |
| 1495 | }; |
| 1496 | |
| 1497 | health_code_update(); |
| 1498 | |
| 1499 | ret = ask_channel(ctx, sock, channel, &attr); |
| 1500 | if (ret < 0) { |
| 1501 | goto end_channel_error; |
| 1502 | } |
| 1503 | |
| 1504 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
| 1505 | ret = consumer_metadata_cache_allocate(channel); |
| 1506 | if (ret < 0) { |
| 1507 | ERR("Allocating metadata cache"); |
| 1508 | goto end_channel_error; |
| 1509 | } |
| 1510 | consumer_timer_switch_start(channel, attr.switch_timer_interval); |
| 1511 | attr.switch_timer_interval = 0; |
| 1512 | } else { |
| 1513 | int monitor_start_ret; |
| 1514 | |
| 1515 | consumer_timer_live_start(channel, |
| 1516 | msg.u.ask_channel.live_timer_interval); |
| 1517 | monitor_start_ret = consumer_timer_monitor_start( |
| 1518 | channel, |
| 1519 | msg.u.ask_channel.monitor_timer_interval); |
| 1520 | if (monitor_start_ret < 0) { |
| 1521 | ERR("Starting channel monitoring timer failed"); |
| 1522 | goto end_channel_error; |
| 1523 | } |
| 1524 | } |
| 1525 | |
| 1526 | health_code_update(); |
| 1527 | |
| 1528 | /* |
| 1529 | * Add the channel to the internal state AFTER all streams were created |
| 1530 | * and successfully sent to session daemon. This way, all streams must |
| 1531 | * be ready before this channel is visible to the threads. |
| 1532 | * If add_channel succeeds, ownership of the channel is |
| 1533 | * passed to consumer_thread_channel_poll(). |
| 1534 | */ |
| 1535 | ret = add_channel(channel, ctx); |
| 1536 | if (ret < 0) { |
| 1537 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
| 1538 | if (channel->switch_timer_enabled == 1) { |
| 1539 | consumer_timer_switch_stop(channel); |
| 1540 | } |
| 1541 | consumer_metadata_cache_destroy(channel); |
| 1542 | } |
| 1543 | if (channel->live_timer_enabled == 1) { |
| 1544 | consumer_timer_live_stop(channel); |
| 1545 | } |
| 1546 | if (channel->monitor_timer_enabled == 1) { |
| 1547 | consumer_timer_monitor_stop(channel); |
| 1548 | } |
| 1549 | goto end_channel_error; |
| 1550 | } |
| 1551 | |
| 1552 | health_code_update(); |
| 1553 | |
| 1554 | /* |
| 1555 | * Channel and streams are now created. Inform the session daemon that |
| 1556 | * everything went well and should wait to receive the channel and |
| 1557 | * streams with ustctl API. |
| 1558 | */ |
| 1559 | ret = consumer_send_status_channel(sock, channel); |
| 1560 | if (ret < 0) { |
| 1561 | /* |
| 1562 | * There is probably a problem on the socket. |
| 1563 | */ |
| 1564 | goto error_fatal; |
| 1565 | } |
| 1566 | |
| 1567 | break; |
| 1568 | } |
| 1569 | case LTTNG_CONSUMER_GET_CHANNEL: |
| 1570 | { |
| 1571 | int ret, relayd_err = 0; |
| 1572 | uint64_t key = msg.u.get_channel.key; |
| 1573 | struct lttng_consumer_channel *channel; |
| 1574 | |
| 1575 | channel = consumer_find_channel(key); |
| 1576 | if (!channel) { |
| 1577 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
| 1578 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
| 1579 | goto end_msg_sessiond; |
| 1580 | } |
| 1581 | |
| 1582 | health_code_update(); |
| 1583 | |
| 1584 | /* Send everything to sessiond. */ |
| 1585 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); |
| 1586 | if (ret < 0) { |
| 1587 | if (relayd_err) { |
| 1588 | /* |
| 1589 | * We were unable to send to the relayd the stream so avoid |
| 1590 | * sending back a fatal error to the thread since this is OK |
| 1591 | * and the consumer can continue its work. The above call |
| 1592 | * has sent the error status message to the sessiond. |
| 1593 | */ |
| 1594 | goto end_nosignal; |
| 1595 | } |
| 1596 | /* |
| 1597 | * The communicaton was broken hence there is a bad state between |
| 1598 | * the consumer and sessiond so stop everything. |
| 1599 | */ |
| 1600 | goto error_fatal; |
| 1601 | } |
| 1602 | |
| 1603 | health_code_update(); |
| 1604 | |
| 1605 | /* |
| 1606 | * In no monitor mode, the streams ownership is kept inside the channel |
| 1607 | * so don't send them to the data thread. |
| 1608 | */ |
| 1609 | if (!channel->monitor) { |
| 1610 | goto end_msg_sessiond; |
| 1611 | } |
| 1612 | |
| 1613 | ret = send_streams_to_thread(channel, ctx); |
| 1614 | if (ret < 0) { |
| 1615 | /* |
| 1616 | * If we are unable to send the stream to the thread, there is |
| 1617 | * a big problem so just stop everything. |
| 1618 | */ |
| 1619 | goto error_fatal; |
| 1620 | } |
| 1621 | /* List MUST be empty after or else it could be reused. */ |
| 1622 | assert(cds_list_empty(&channel->streams.head)); |
| 1623 | goto end_msg_sessiond; |
| 1624 | } |
| 1625 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
| 1626 | { |
| 1627 | uint64_t key = msg.u.destroy_channel.key; |
| 1628 | |
| 1629 | /* |
| 1630 | * Only called if streams have not been sent to stream |
| 1631 | * manager thread. However, channel has been sent to |
| 1632 | * channel manager thread. |
| 1633 | */ |
| 1634 | notify_thread_del_channel(ctx, key); |
| 1635 | goto end_msg_sessiond; |
| 1636 | } |
| 1637 | case LTTNG_CONSUMER_CLOSE_METADATA: |
| 1638 | { |
| 1639 | int ret; |
| 1640 | |
| 1641 | ret = close_metadata(msg.u.close_metadata.key); |
| 1642 | if (ret != 0) { |
| 1643 | ret_code = ret; |
| 1644 | } |
| 1645 | |
| 1646 | goto end_msg_sessiond; |
| 1647 | } |
| 1648 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
| 1649 | { |
| 1650 | int ret; |
| 1651 | |
| 1652 | ret = flush_channel(msg.u.flush_channel.key); |
| 1653 | if (ret != 0) { |
| 1654 | ret_code = ret; |
| 1655 | } |
| 1656 | |
| 1657 | goto end_msg_sessiond; |
| 1658 | } |
| 1659 | case LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL: |
| 1660 | { |
| 1661 | int ret; |
| 1662 | |
| 1663 | ret = clear_quiescent_channel( |
| 1664 | msg.u.clear_quiescent_channel.key); |
| 1665 | if (ret != 0) { |
| 1666 | ret_code = ret; |
| 1667 | } |
| 1668 | |
| 1669 | goto end_msg_sessiond; |
| 1670 | } |
| 1671 | case LTTNG_CONSUMER_PUSH_METADATA: |
| 1672 | { |
| 1673 | int ret; |
| 1674 | uint64_t len = msg.u.push_metadata.len; |
| 1675 | uint64_t key = msg.u.push_metadata.key; |
| 1676 | uint64_t offset = msg.u.push_metadata.target_offset; |
| 1677 | uint64_t version = msg.u.push_metadata.version; |
| 1678 | struct lttng_consumer_channel *channel; |
| 1679 | |
| 1680 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
| 1681 | len); |
| 1682 | |
| 1683 | channel = consumer_find_channel(key); |
| 1684 | if (!channel) { |
| 1685 | /* |
| 1686 | * This is possible if the metadata creation on the consumer side |
| 1687 | * is in flight vis-a-vis a concurrent push metadata from the |
| 1688 | * session daemon. Simply return that the channel failed and the |
| 1689 | * session daemon will handle that message correctly considering |
| 1690 | * that this race is acceptable thus the DBG() statement here. |
| 1691 | */ |
| 1692 | DBG("UST consumer push metadata %" PRIu64 " not found", key); |
| 1693 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; |
| 1694 | goto end_msg_sessiond; |
| 1695 | } |
| 1696 | |
| 1697 | health_code_update(); |
| 1698 | |
| 1699 | if (!len) { |
| 1700 | /* |
| 1701 | * There is nothing to receive. We have simply |
| 1702 | * checked whether the channel can be found. |
| 1703 | */ |
| 1704 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
| 1705 | goto end_msg_sessiond; |
| 1706 | } |
| 1707 | |
| 1708 | /* Tell session daemon we are ready to receive the metadata. */ |
| 1709 | ret = consumer_send_status_msg(sock, LTTCOMM_CONSUMERD_SUCCESS); |
| 1710 | if (ret < 0) { |
| 1711 | /* Somehow, the session daemon is not responding anymore. */ |
| 1712 | goto error_fatal; |
| 1713 | } |
| 1714 | |
| 1715 | health_code_update(); |
| 1716 | |
| 1717 | /* Wait for more data. */ |
| 1718 | health_poll_entry(); |
| 1719 | ret = lttng_consumer_poll_socket(consumer_sockpoll); |
| 1720 | health_poll_exit(); |
| 1721 | if (ret) { |
| 1722 | goto error_fatal; |
| 1723 | } |
| 1724 | |
| 1725 | health_code_update(); |
| 1726 | |
| 1727 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
| 1728 | len, version, channel, 0, 1); |
| 1729 | if (ret < 0) { |
| 1730 | /* error receiving from sessiond */ |
| 1731 | goto error_fatal; |
| 1732 | } else { |
| 1733 | ret_code = ret; |
| 1734 | goto end_msg_sessiond; |
| 1735 | } |
| 1736 | } |
| 1737 | case LTTNG_CONSUMER_SETUP_METADATA: |
| 1738 | { |
| 1739 | int ret; |
| 1740 | |
| 1741 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); |
| 1742 | if (ret) { |
| 1743 | ret_code = ret; |
| 1744 | } |
| 1745 | goto end_msg_sessiond; |
| 1746 | } |
| 1747 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
| 1748 | { |
| 1749 | if (msg.u.snapshot_channel.metadata) { |
| 1750 | ret = snapshot_metadata(msg.u.snapshot_channel.key, |
| 1751 | msg.u.snapshot_channel.pathname, |
| 1752 | msg.u.snapshot_channel.relayd_id, |
| 1753 | ctx); |
| 1754 | if (ret < 0) { |
| 1755 | ERR("Snapshot metadata failed"); |
| 1756 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
| 1757 | } |
| 1758 | } else { |
| 1759 | ret = snapshot_channel(msg.u.snapshot_channel.key, |
| 1760 | msg.u.snapshot_channel.pathname, |
| 1761 | msg.u.snapshot_channel.relayd_id, |
| 1762 | msg.u.snapshot_channel.nb_packets_per_stream, |
| 1763 | ctx); |
| 1764 | if (ret < 0) { |
| 1765 | ERR("Snapshot channel failed"); |
| 1766 | ret_code = LTTCOMM_CONSUMERD_CHANNEL_FAIL; |
| 1767 | } |
| 1768 | } |
| 1769 | |
| 1770 | health_code_update(); |
| 1771 | ret = consumer_send_status_msg(sock, ret_code); |
| 1772 | if (ret < 0) { |
| 1773 | /* Somehow, the session daemon is not responding anymore. */ |
| 1774 | goto end_nosignal; |
| 1775 | } |
| 1776 | health_code_update(); |
| 1777 | break; |
| 1778 | } |
| 1779 | case LTTNG_CONSUMER_DISCARDED_EVENTS: |
| 1780 | { |
| 1781 | int ret = 0; |
| 1782 | uint64_t discarded_events; |
| 1783 | struct lttng_ht_iter iter; |
| 1784 | struct lttng_ht *ht; |
| 1785 | struct lttng_consumer_stream *stream; |
| 1786 | uint64_t id = msg.u.discarded_events.session_id; |
| 1787 | uint64_t key = msg.u.discarded_events.channel_key; |
| 1788 | |
| 1789 | DBG("UST consumer discarded events command for session id %" |
| 1790 | PRIu64, id); |
| 1791 | rcu_read_lock(); |
| 1792 | pthread_mutex_lock(&consumer_data.lock); |
| 1793 | |
| 1794 | ht = consumer_data.stream_list_ht; |
| 1795 | |
| 1796 | /* |
| 1797 | * We only need a reference to the channel, but they are not |
| 1798 | * directly indexed, so we just use the first matching stream |
| 1799 | * to extract the information we need, we default to 0 if not |
| 1800 | * found (no events are dropped if the channel is not yet in |
| 1801 | * use). |
| 1802 | */ |
| 1803 | discarded_events = 0; |
| 1804 | cds_lfht_for_each_entry_duplicate(ht->ht, |
| 1805 | ht->hash_fct(&id, lttng_ht_seed), |
| 1806 | ht->match_fct, &id, |
| 1807 | &iter.iter, stream, node_session_id.node) { |
| 1808 | if (stream->chan->key == key) { |
| 1809 | discarded_events = stream->chan->discarded_events; |
| 1810 | break; |
| 1811 | } |
| 1812 | } |
| 1813 | pthread_mutex_unlock(&consumer_data.lock); |
| 1814 | rcu_read_unlock(); |
| 1815 | |
| 1816 | DBG("UST consumer discarded events command for session id %" |
| 1817 | PRIu64 ", channel key %" PRIu64, id, key); |
| 1818 | |
| 1819 | health_code_update(); |
| 1820 | |
| 1821 | /* Send back returned value to session daemon */ |
| 1822 | ret = lttcomm_send_unix_sock(sock, &discarded_events, sizeof(discarded_events)); |
| 1823 | if (ret < 0) { |
| 1824 | PERROR("send discarded events"); |
| 1825 | goto error_fatal; |
| 1826 | } |
| 1827 | |
| 1828 | break; |
| 1829 | } |
| 1830 | case LTTNG_CONSUMER_LOST_PACKETS: |
| 1831 | { |
| 1832 | int ret; |
| 1833 | uint64_t lost_packets; |
| 1834 | struct lttng_ht_iter iter; |
| 1835 | struct lttng_ht *ht; |
| 1836 | struct lttng_consumer_stream *stream; |
| 1837 | uint64_t id = msg.u.lost_packets.session_id; |
| 1838 | uint64_t key = msg.u.lost_packets.channel_key; |
| 1839 | |
| 1840 | DBG("UST consumer lost packets command for session id %" |
| 1841 | PRIu64, id); |
| 1842 | rcu_read_lock(); |
| 1843 | pthread_mutex_lock(&consumer_data.lock); |
| 1844 | |
| 1845 | ht = consumer_data.stream_list_ht; |
| 1846 | |
| 1847 | /* |
| 1848 | * We only need a reference to the channel, but they are not |
| 1849 | * directly indexed, so we just use the first matching stream |
| 1850 | * to extract the information we need, we default to 0 if not |
| 1851 | * found (no packets lost if the channel is not yet in use). |
| 1852 | */ |
| 1853 | lost_packets = 0; |
| 1854 | cds_lfht_for_each_entry_duplicate(ht->ht, |
| 1855 | ht->hash_fct(&id, lttng_ht_seed), |
| 1856 | ht->match_fct, &id, |
| 1857 | &iter.iter, stream, node_session_id.node) { |
| 1858 | if (stream->chan->key == key) { |
| 1859 | lost_packets = stream->chan->lost_packets; |
| 1860 | break; |
| 1861 | } |
| 1862 | } |
| 1863 | pthread_mutex_unlock(&consumer_data.lock); |
| 1864 | rcu_read_unlock(); |
| 1865 | |
| 1866 | DBG("UST consumer lost packets command for session id %" |
| 1867 | PRIu64 ", channel key %" PRIu64, id, key); |
| 1868 | |
| 1869 | health_code_update(); |
| 1870 | |
| 1871 | /* Send back returned value to session daemon */ |
| 1872 | ret = lttcomm_send_unix_sock(sock, &lost_packets, |
| 1873 | sizeof(lost_packets)); |
| 1874 | if (ret < 0) { |
| 1875 | PERROR("send lost packets"); |
| 1876 | goto error_fatal; |
| 1877 | } |
| 1878 | |
| 1879 | break; |
| 1880 | } |
| 1881 | case LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE: |
| 1882 | { |
| 1883 | int channel_monitor_pipe; |
| 1884 | |
| 1885 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
| 1886 | /* Successfully received the command's type. */ |
| 1887 | ret = consumer_send_status_msg(sock, ret_code); |
| 1888 | if (ret < 0) { |
| 1889 | goto error_fatal; |
| 1890 | } |
| 1891 | |
| 1892 | ret = lttcomm_recv_fds_unix_sock(sock, &channel_monitor_pipe, |
| 1893 | 1); |
| 1894 | if (ret != sizeof(channel_monitor_pipe)) { |
| 1895 | ERR("Failed to receive channel monitor pipe"); |
| 1896 | goto error_fatal; |
| 1897 | } |
| 1898 | |
| 1899 | DBG("Received channel monitor pipe (%d)", channel_monitor_pipe); |
| 1900 | ret = consumer_timer_thread_set_channel_monitor_pipe( |
| 1901 | channel_monitor_pipe); |
| 1902 | if (!ret) { |
| 1903 | int flags; |
| 1904 | |
| 1905 | ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
| 1906 | /* Set the pipe as non-blocking. */ |
| 1907 | ret = fcntl(channel_monitor_pipe, F_GETFL, 0); |
| 1908 | if (ret == -1) { |
| 1909 | PERROR("fcntl get flags of the channel monitoring pipe"); |
| 1910 | goto error_fatal; |
| 1911 | } |
| 1912 | flags = ret; |
| 1913 | |
| 1914 | ret = fcntl(channel_monitor_pipe, F_SETFL, |
| 1915 | flags | O_NONBLOCK); |
| 1916 | if (ret == -1) { |
| 1917 | PERROR("fcntl set O_NONBLOCK flag of the channel monitoring pipe"); |
| 1918 | goto error_fatal; |
| 1919 | } |
| 1920 | DBG("Channel monitor pipe set as non-blocking"); |
| 1921 | } else { |
| 1922 | ret_code = LTTCOMM_CONSUMERD_ALREADY_SET; |
| 1923 | } |
| 1924 | goto end_msg_sessiond; |
| 1925 | } |
| 1926 | case LTTNG_CONSUMER_CLEAR_CHANNEL: |
| 1927 | { |
| 1928 | struct lttng_consumer_channel *channel; |
| 1929 | uint64_t key = msg.u.clear_channel.key; |
| 1930 | |
| 1931 | channel = consumer_find_channel(key); |
| 1932 | if (!channel) { |
| 1933 | DBG("Channel %" PRIu64 " not found", key); |
| 1934 | ret_code = LTTCOMM_CONSUMERD_CHAN_NOT_FOUND; |
| 1935 | } else { |
| 1936 | ret = lttng_consumer_clear_channel(channel); |
| 1937 | if (ret) { |
| 1938 | ERR("Clear channel failed key %" PRIu64, key); |
| 1939 | ret_code = ret; |
| 1940 | } |
| 1941 | |
| 1942 | health_code_update(); |
| 1943 | } |
| 1944 | ret = consumer_send_status_msg(sock, ret_code); |
| 1945 | if (ret < 0) { |
| 1946 | /* Somehow, the session daemon is not responding anymore. */ |
| 1947 | goto end_nosignal; |
| 1948 | } |
| 1949 | break; |
| 1950 | } |
| 1951 | default: |
| 1952 | break; |
| 1953 | } |
| 1954 | |
| 1955 | end_nosignal: |
| 1956 | rcu_read_unlock(); |
| 1957 | |
| 1958 | health_code_update(); |
| 1959 | |
| 1960 | /* |
| 1961 | * Return 1 to indicate success since the 0 value can be a socket |
| 1962 | * shutdown during the recv() or send() call. |
| 1963 | */ |
| 1964 | return 1; |
| 1965 | |
| 1966 | end_msg_sessiond: |
| 1967 | /* |
| 1968 | * The returned value here is not useful since either way we'll return 1 to |
| 1969 | * the caller because the session daemon socket management is done |
| 1970 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. |
| 1971 | */ |
| 1972 | ret = consumer_send_status_msg(sock, ret_code); |
| 1973 | if (ret < 0) { |
| 1974 | goto error_fatal; |
| 1975 | } |
| 1976 | rcu_read_unlock(); |
| 1977 | |
| 1978 | health_code_update(); |
| 1979 | |
| 1980 | return 1; |
| 1981 | end_channel_error: |
| 1982 | if (channel) { |
| 1983 | /* |
| 1984 | * Free channel here since no one has a reference to it. We don't |
| 1985 | * free after that because a stream can store this pointer. |
| 1986 | */ |
| 1987 | destroy_channel(channel); |
| 1988 | } |
| 1989 | /* We have to send a status channel message indicating an error. */ |
| 1990 | ret = consumer_send_status_channel(sock, NULL); |
| 1991 | if (ret < 0) { |
| 1992 | /* Stop everything if session daemon can not be notified. */ |
| 1993 | goto error_fatal; |
| 1994 | } |
| 1995 | rcu_read_unlock(); |
| 1996 | |
| 1997 | health_code_update(); |
| 1998 | |
| 1999 | return 1; |
| 2000 | error_fatal: |
| 2001 | rcu_read_unlock(); |
| 2002 | /* This will issue a consumer stop. */ |
| 2003 | return -1; |
| 2004 | } |
| 2005 | |
| 2006 | /* |
| 2007 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be |
| 2008 | * compiled out, we isolate it in this library. |
| 2009 | */ |
| 2010 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, |
| 2011 | unsigned long *off) |
| 2012 | { |
| 2013 | assert(stream); |
| 2014 | assert(stream->ustream); |
| 2015 | |
| 2016 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
| 2017 | } |
| 2018 | |
| 2019 | /* |
| 2020 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be |
| 2021 | * compiled out, we isolate it in this library. |
| 2022 | */ |
| 2023 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) |
| 2024 | { |
| 2025 | assert(stream); |
| 2026 | assert(stream->ustream); |
| 2027 | |
| 2028 | return ustctl_get_mmap_base(stream->ustream); |
| 2029 | } |
| 2030 | |
| 2031 | /* |
| 2032 | * Take a snapshot for a specific stream. |
| 2033 | * |
| 2034 | * Returns 0 on success, < 0 on error |
| 2035 | */ |
| 2036 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
| 2037 | { |
| 2038 | assert(stream); |
| 2039 | assert(stream->ustream); |
| 2040 | |
| 2041 | return ustctl_snapshot(stream->ustream); |
| 2042 | } |
| 2043 | |
| 2044 | /* |
| 2045 | * Sample consumed and produced positions for a specific stream. |
| 2046 | * |
| 2047 | * Returns 0 on success, < 0 on error. |
| 2048 | */ |
| 2049 | int lttng_ustconsumer_sample_snapshot_positions( |
| 2050 | struct lttng_consumer_stream *stream) |
| 2051 | { |
| 2052 | assert(stream); |
| 2053 | assert(stream->ustream); |
| 2054 | |
| 2055 | return ustctl_snapshot_sample_positions(stream->ustream); |
| 2056 | } |
| 2057 | |
| 2058 | /* |
| 2059 | * Get the produced position |
| 2060 | * |
| 2061 | * Returns 0 on success, < 0 on error |
| 2062 | */ |
| 2063 | int lttng_ustconsumer_get_produced_snapshot( |
| 2064 | struct lttng_consumer_stream *stream, unsigned long *pos) |
| 2065 | { |
| 2066 | assert(stream); |
| 2067 | assert(stream->ustream); |
| 2068 | assert(pos); |
| 2069 | |
| 2070 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
| 2071 | } |
| 2072 | |
| 2073 | /* |
| 2074 | * Get the consumed position |
| 2075 | * |
| 2076 | * Returns 0 on success, < 0 on error |
| 2077 | */ |
| 2078 | int lttng_ustconsumer_get_consumed_snapshot( |
| 2079 | struct lttng_consumer_stream *stream, unsigned long *pos) |
| 2080 | { |
| 2081 | assert(stream); |
| 2082 | assert(stream->ustream); |
| 2083 | assert(pos); |
| 2084 | |
| 2085 | return ustctl_snapshot_get_consumed(stream->ustream, pos); |
| 2086 | } |
| 2087 | |
| 2088 | void lttng_ustconsumer_flush_buffer(struct lttng_consumer_stream *stream, |
| 2089 | int producer) |
| 2090 | { |
| 2091 | assert(stream); |
| 2092 | assert(stream->ustream); |
| 2093 | |
| 2094 | ustctl_flush_buffer(stream->ustream, producer); |
| 2095 | } |
| 2096 | |
| 2097 | void lttng_ustconsumer_clear_buffer(struct lttng_consumer_stream *stream) |
| 2098 | { |
| 2099 | assert(stream); |
| 2100 | assert(stream->ustream); |
| 2101 | |
| 2102 | ustctl_clear_buffer(stream->ustream); |
| 2103 | } |
| 2104 | |
| 2105 | int lttng_ustconsumer_get_current_timestamp( |
| 2106 | struct lttng_consumer_stream *stream, uint64_t *ts) |
| 2107 | { |
| 2108 | assert(stream); |
| 2109 | assert(stream->ustream); |
| 2110 | assert(ts); |
| 2111 | |
| 2112 | return ustctl_get_current_timestamp(stream->ustream, ts); |
| 2113 | } |
| 2114 | |
| 2115 | int lttng_ustconsumer_get_sequence_number( |
| 2116 | struct lttng_consumer_stream *stream, uint64_t *seq) |
| 2117 | { |
| 2118 | assert(stream); |
| 2119 | assert(stream->ustream); |
| 2120 | assert(seq); |
| 2121 | |
| 2122 | return ustctl_get_sequence_number(stream->ustream, seq); |
| 2123 | } |
| 2124 | |
| 2125 | /* |
| 2126 | * Called when the stream signals the consumer that it has hung up. |
| 2127 | */ |
| 2128 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) |
| 2129 | { |
| 2130 | assert(stream); |
| 2131 | assert(stream->ustream); |
| 2132 | |
| 2133 | pthread_mutex_lock(&stream->lock); |
| 2134 | if (!stream->quiescent) { |
| 2135 | ustctl_flush_buffer(stream->ustream, 0); |
| 2136 | stream->quiescent = true; |
| 2137 | } |
| 2138 | pthread_mutex_unlock(&stream->lock); |
| 2139 | stream->hangup_flush_done = 1; |
| 2140 | } |
| 2141 | |
| 2142 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
| 2143 | { |
| 2144 | int i; |
| 2145 | |
| 2146 | assert(chan); |
| 2147 | assert(chan->uchan); |
| 2148 | |
| 2149 | if (chan->switch_timer_enabled == 1) { |
| 2150 | consumer_timer_switch_stop(chan); |
| 2151 | } |
| 2152 | for (i = 0; i < chan->nr_stream_fds; i++) { |
| 2153 | int ret; |
| 2154 | |
| 2155 | ret = close(chan->stream_fds[i]); |
| 2156 | if (ret) { |
| 2157 | PERROR("close"); |
| 2158 | } |
| 2159 | if (chan->shm_path[0]) { |
| 2160 | char shm_path[PATH_MAX]; |
| 2161 | |
| 2162 | ret = get_stream_shm_path(shm_path, chan->shm_path, i); |
| 2163 | if (ret) { |
| 2164 | ERR("Cannot get stream shm path"); |
| 2165 | } |
| 2166 | ret = run_as_unlink(shm_path, chan->uid, chan->gid); |
| 2167 | if (ret) { |
| 2168 | PERROR("unlink %s", shm_path); |
| 2169 | } |
| 2170 | } |
| 2171 | } |
| 2172 | } |
| 2173 | |
| 2174 | void lttng_ustconsumer_free_channel(struct lttng_consumer_channel *chan) |
| 2175 | { |
| 2176 | assert(chan); |
| 2177 | assert(chan->uchan); |
| 2178 | |
| 2179 | consumer_metadata_cache_destroy(chan); |
| 2180 | ustctl_destroy_channel(chan->uchan); |
| 2181 | /* Try to rmdir all directories under shm_path root. */ |
| 2182 | if (chan->root_shm_path[0]) { |
| 2183 | (void) run_as_rmdir_recursive(chan->root_shm_path, |
| 2184 | chan->uid, chan->gid); |
| 2185 | } |
| 2186 | free(chan->stream_fds); |
| 2187 | } |
| 2188 | |
| 2189 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
| 2190 | { |
| 2191 | assert(stream); |
| 2192 | assert(stream->ustream); |
| 2193 | |
| 2194 | if (stream->chan->switch_timer_enabled == 1) { |
| 2195 | consumer_timer_switch_stop(stream->chan); |
| 2196 | } |
| 2197 | ustctl_destroy_stream(stream->ustream); |
| 2198 | } |
| 2199 | |
| 2200 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream) |
| 2201 | { |
| 2202 | assert(stream); |
| 2203 | assert(stream->ustream); |
| 2204 | |
| 2205 | return ustctl_stream_get_wakeup_fd(stream->ustream); |
| 2206 | } |
| 2207 | |
| 2208 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream) |
| 2209 | { |
| 2210 | assert(stream); |
| 2211 | assert(stream->ustream); |
| 2212 | |
| 2213 | return ustctl_stream_close_wakeup_fd(stream->ustream); |
| 2214 | } |
| 2215 | |
| 2216 | /* |
| 2217 | * Populate index values of a UST stream. Values are set in big endian order. |
| 2218 | * |
| 2219 | * Return 0 on success or else a negative value. |
| 2220 | */ |
| 2221 | static int get_index_values(struct ctf_packet_index *index, |
| 2222 | struct ustctl_consumer_stream *ustream) |
| 2223 | { |
| 2224 | int ret; |
| 2225 | |
| 2226 | ret = ustctl_get_timestamp_begin(ustream, &index->timestamp_begin); |
| 2227 | if (ret < 0) { |
| 2228 | PERROR("ustctl_get_timestamp_begin"); |
| 2229 | goto error; |
| 2230 | } |
| 2231 | index->timestamp_begin = htobe64(index->timestamp_begin); |
| 2232 | |
| 2233 | ret = ustctl_get_timestamp_end(ustream, &index->timestamp_end); |
| 2234 | if (ret < 0) { |
| 2235 | PERROR("ustctl_get_timestamp_end"); |
| 2236 | goto error; |
| 2237 | } |
| 2238 | index->timestamp_end = htobe64(index->timestamp_end); |
| 2239 | |
| 2240 | ret = ustctl_get_events_discarded(ustream, &index->events_discarded); |
| 2241 | if (ret < 0) { |
| 2242 | PERROR("ustctl_get_events_discarded"); |
| 2243 | goto error; |
| 2244 | } |
| 2245 | index->events_discarded = htobe64(index->events_discarded); |
| 2246 | |
| 2247 | ret = ustctl_get_content_size(ustream, &index->content_size); |
| 2248 | if (ret < 0) { |
| 2249 | PERROR("ustctl_get_content_size"); |
| 2250 | goto error; |
| 2251 | } |
| 2252 | index->content_size = htobe64(index->content_size); |
| 2253 | |
| 2254 | ret = ustctl_get_packet_size(ustream, &index->packet_size); |
| 2255 | if (ret < 0) { |
| 2256 | PERROR("ustctl_get_packet_size"); |
| 2257 | goto error; |
| 2258 | } |
| 2259 | index->packet_size = htobe64(index->packet_size); |
| 2260 | |
| 2261 | ret = ustctl_get_stream_id(ustream, &index->stream_id); |
| 2262 | if (ret < 0) { |
| 2263 | PERROR("ustctl_get_stream_id"); |
| 2264 | goto error; |
| 2265 | } |
| 2266 | index->stream_id = htobe64(index->stream_id); |
| 2267 | |
| 2268 | ret = ustctl_get_instance_id(ustream, &index->stream_instance_id); |
| 2269 | if (ret < 0) { |
| 2270 | PERROR("ustctl_get_instance_id"); |
| 2271 | goto error; |
| 2272 | } |
| 2273 | index->stream_instance_id = htobe64(index->stream_instance_id); |
| 2274 | |
| 2275 | ret = ustctl_get_sequence_number(ustream, &index->packet_seq_num); |
| 2276 | if (ret < 0) { |
| 2277 | PERROR("ustctl_get_sequence_number"); |
| 2278 | goto error; |
| 2279 | } |
| 2280 | index->packet_seq_num = htobe64(index->packet_seq_num); |
| 2281 | |
| 2282 | error: |
| 2283 | return ret; |
| 2284 | } |
| 2285 | |
| 2286 | static |
| 2287 | void metadata_stream_reset_cache(struct lttng_consumer_stream *stream, |
| 2288 | struct consumer_metadata_cache *cache) |
| 2289 | { |
| 2290 | DBG("Metadata stream update to version %" PRIu64, |
| 2291 | cache->version); |
| 2292 | stream->ust_metadata_pushed = 0; |
| 2293 | stream->metadata_version = cache->version; |
| 2294 | stream->reset_metadata_flag = 1; |
| 2295 | } |
| 2296 | |
| 2297 | /* |
| 2298 | * Check if the version of the metadata stream and metadata cache match. |
| 2299 | * If the cache got updated, reset the metadata stream. |
| 2300 | * The stream lock and metadata cache lock MUST be held. |
| 2301 | * Return 0 on success, a negative value on error. |
| 2302 | */ |
| 2303 | static |
| 2304 | int metadata_stream_check_version(struct lttng_consumer_stream *stream) |
| 2305 | { |
| 2306 | int ret = 0; |
| 2307 | struct consumer_metadata_cache *cache = stream->chan->metadata_cache; |
| 2308 | |
| 2309 | if (cache->version == stream->metadata_version) { |
| 2310 | goto end; |
| 2311 | } |
| 2312 | metadata_stream_reset_cache(stream, cache); |
| 2313 | |
| 2314 | end: |
| 2315 | return ret; |
| 2316 | } |
| 2317 | |
| 2318 | /* |
| 2319 | * Write up to one packet from the metadata cache to the channel. |
| 2320 | * |
| 2321 | * Returns the number of bytes pushed in the cache, or a negative value |
| 2322 | * on error. |
| 2323 | */ |
| 2324 | static |
| 2325 | int commit_one_metadata_packet(struct lttng_consumer_stream *stream) |
| 2326 | { |
| 2327 | ssize_t write_len; |
| 2328 | int ret; |
| 2329 | |
| 2330 | pthread_mutex_lock(&stream->chan->metadata_cache->lock); |
| 2331 | ret = metadata_stream_check_version(stream); |
| 2332 | if (ret < 0) { |
| 2333 | goto end; |
| 2334 | } |
| 2335 | if (stream->chan->metadata_cache->max_offset |
| 2336 | == stream->ust_metadata_pushed) { |
| 2337 | ret = 0; |
| 2338 | goto end; |
| 2339 | } |
| 2340 | |
| 2341 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, |
| 2342 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], |
| 2343 | stream->chan->metadata_cache->max_offset |
| 2344 | - stream->ust_metadata_pushed); |
| 2345 | assert(write_len != 0); |
| 2346 | if (write_len < 0) { |
| 2347 | ERR("Writing one metadata packet"); |
| 2348 | ret = -1; |
| 2349 | goto end; |
| 2350 | } |
| 2351 | stream->ust_metadata_pushed += write_len; |
| 2352 | |
| 2353 | assert(stream->chan->metadata_cache->max_offset >= |
| 2354 | stream->ust_metadata_pushed); |
| 2355 | ret = write_len; |
| 2356 | |
| 2357 | end: |
| 2358 | pthread_mutex_unlock(&stream->chan->metadata_cache->lock); |
| 2359 | return ret; |
| 2360 | } |
| 2361 | |
| 2362 | |
| 2363 | /* |
| 2364 | * Sync metadata meaning request them to the session daemon and snapshot to the |
| 2365 | * metadata thread can consumer them. |
| 2366 | * |
| 2367 | * Metadata stream lock is held here, but we need to release it when |
| 2368 | * interacting with sessiond, else we cause a deadlock with live |
| 2369 | * awaiting on metadata to be pushed out. |
| 2370 | * |
| 2371 | * Return 0 if new metadatda is available, EAGAIN if the metadata stream |
| 2372 | * is empty or a negative value on error. |
| 2373 | */ |
| 2374 | int lttng_ustconsumer_sync_metadata(struct lttng_consumer_local_data *ctx, |
| 2375 | struct lttng_consumer_stream *metadata) |
| 2376 | { |
| 2377 | int ret; |
| 2378 | int retry = 0; |
| 2379 | |
| 2380 | assert(ctx); |
| 2381 | assert(metadata); |
| 2382 | |
| 2383 | pthread_mutex_unlock(&metadata->lock); |
| 2384 | /* |
| 2385 | * Request metadata from the sessiond, but don't wait for the flush |
| 2386 | * because we locked the metadata thread. |
| 2387 | */ |
| 2388 | ret = lttng_ustconsumer_request_metadata(ctx, metadata->chan, 0, 0); |
| 2389 | pthread_mutex_lock(&metadata->lock); |
| 2390 | if (ret < 0) { |
| 2391 | goto end; |
| 2392 | } |
| 2393 | |
| 2394 | ret = commit_one_metadata_packet(metadata); |
| 2395 | if (ret <= 0) { |
| 2396 | goto end; |
| 2397 | } else if (ret > 0) { |
| 2398 | retry = 1; |
| 2399 | } |
| 2400 | |
| 2401 | ustctl_flush_buffer(metadata->ustream, 1); |
| 2402 | ret = ustctl_snapshot(metadata->ustream); |
| 2403 | if (ret < 0) { |
| 2404 | if (errno != EAGAIN) { |
| 2405 | ERR("Sync metadata, taking UST snapshot"); |
| 2406 | goto end; |
| 2407 | } |
| 2408 | DBG("No new metadata when syncing them."); |
| 2409 | /* No new metadata, exit. */ |
| 2410 | ret = ENODATA; |
| 2411 | goto end; |
| 2412 | } |
| 2413 | |
| 2414 | /* |
| 2415 | * After this flush, we still need to extract metadata. |
| 2416 | */ |
| 2417 | if (retry) { |
| 2418 | ret = EAGAIN; |
| 2419 | } |
| 2420 | |
| 2421 | end: |
| 2422 | return ret; |
| 2423 | } |
| 2424 | |
| 2425 | /* |
| 2426 | * Return 0 on success else a negative value. |
| 2427 | */ |
| 2428 | static int notify_if_more_data(struct lttng_consumer_stream *stream, |
| 2429 | struct lttng_consumer_local_data *ctx) |
| 2430 | { |
| 2431 | int ret; |
| 2432 | struct ustctl_consumer_stream *ustream; |
| 2433 | |
| 2434 | assert(stream); |
| 2435 | assert(ctx); |
| 2436 | |
| 2437 | ustream = stream->ustream; |
| 2438 | |
| 2439 | /* |
| 2440 | * First, we are going to check if there is a new subbuffer available |
| 2441 | * before reading the stream wait_fd. |
| 2442 | */ |
| 2443 | /* Get the next subbuffer */ |
| 2444 | ret = ustctl_get_next_subbuf(ustream); |
| 2445 | if (ret) { |
| 2446 | /* No more data found, flag the stream. */ |
| 2447 | stream->has_data = 0; |
| 2448 | ret = 0; |
| 2449 | goto end; |
| 2450 | } |
| 2451 | |
| 2452 | ret = ustctl_put_subbuf(ustream); |
| 2453 | assert(!ret); |
| 2454 | |
| 2455 | /* This stream still has data. Flag it and wake up the data thread. */ |
| 2456 | stream->has_data = 1; |
| 2457 | |
| 2458 | if (stream->monitor && !stream->hangup_flush_done && !ctx->has_wakeup) { |
| 2459 | ssize_t writelen; |
| 2460 | |
| 2461 | writelen = lttng_pipe_write(ctx->consumer_wakeup_pipe, "!", 1); |
| 2462 | if (writelen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { |
| 2463 | ret = writelen; |
| 2464 | goto end; |
| 2465 | } |
| 2466 | |
| 2467 | /* The wake up pipe has been notified. */ |
| 2468 | ctx->has_wakeup = 1; |
| 2469 | } |
| 2470 | ret = 0; |
| 2471 | |
| 2472 | end: |
| 2473 | return ret; |
| 2474 | } |
| 2475 | |
| 2476 | static |
| 2477 | int update_stream_stats(struct lttng_consumer_stream *stream) |
| 2478 | { |
| 2479 | int ret; |
| 2480 | uint64_t seq, discarded; |
| 2481 | |
| 2482 | ret = ustctl_get_sequence_number(stream->ustream, &seq); |
| 2483 | if (ret < 0) { |
| 2484 | PERROR("ustctl_get_sequence_number"); |
| 2485 | goto end; |
| 2486 | } |
| 2487 | /* |
| 2488 | * Start the sequence when we extract the first packet in case we don't |
| 2489 | * start at 0 (for example if a consumer is not connected to the |
| 2490 | * session immediately after the beginning). |
| 2491 | */ |
| 2492 | if (stream->last_sequence_number == -1ULL) { |
| 2493 | stream->last_sequence_number = seq; |
| 2494 | } else if (seq > stream->last_sequence_number) { |
| 2495 | stream->chan->lost_packets += seq - |
| 2496 | stream->last_sequence_number - 1; |
| 2497 | } else { |
| 2498 | /* seq <= last_sequence_number */ |
| 2499 | ERR("Sequence number inconsistent : prev = %" PRIu64 |
| 2500 | ", current = %" PRIu64, |
| 2501 | stream->last_sequence_number, seq); |
| 2502 | ret = -1; |
| 2503 | goto end; |
| 2504 | } |
| 2505 | stream->last_sequence_number = seq; |
| 2506 | |
| 2507 | ret = ustctl_get_events_discarded(stream->ustream, &discarded); |
| 2508 | if (ret < 0) { |
| 2509 | PERROR("kernctl_get_events_discarded"); |
| 2510 | goto end; |
| 2511 | } |
| 2512 | if (discarded < stream->last_discarded_events) { |
| 2513 | /* |
| 2514 | * Overflow has occurred. We assume only one wrap-around |
| 2515 | * has occurred. |
| 2516 | */ |
| 2517 | stream->chan->discarded_events += |
| 2518 | (1ULL << (CAA_BITS_PER_LONG - 1)) - |
| 2519 | stream->last_discarded_events + discarded; |
| 2520 | } else { |
| 2521 | stream->chan->discarded_events += discarded - |
| 2522 | stream->last_discarded_events; |
| 2523 | } |
| 2524 | stream->last_discarded_events = discarded; |
| 2525 | ret = 0; |
| 2526 | |
| 2527 | end: |
| 2528 | return ret; |
| 2529 | } |
| 2530 | |
| 2531 | /* |
| 2532 | * Read subbuffer from the given stream. |
| 2533 | * |
| 2534 | * Stream lock MUST be acquired. |
| 2535 | * |
| 2536 | * Return 0 on success else a negative value. |
| 2537 | */ |
| 2538 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
| 2539 | struct lttng_consumer_local_data *ctx) |
| 2540 | { |
| 2541 | unsigned long len, subbuf_size, padding; |
| 2542 | int err, write_index = 1; |
| 2543 | long ret = 0; |
| 2544 | struct ustctl_consumer_stream *ustream; |
| 2545 | struct ctf_packet_index index; |
| 2546 | |
| 2547 | assert(stream); |
| 2548 | assert(stream->ustream); |
| 2549 | assert(ctx); |
| 2550 | |
| 2551 | DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
| 2552 | stream->name); |
| 2553 | |
| 2554 | /* Ease our life for what's next. */ |
| 2555 | ustream = stream->ustream; |
| 2556 | |
| 2557 | /* |
| 2558 | * We can consume the 1 byte written into the wait_fd by UST. Don't trigger |
| 2559 | * error if we cannot read this one byte (read returns 0), or if the error |
| 2560 | * is EAGAIN or EWOULDBLOCK. |
| 2561 | * |
| 2562 | * This is only done when the stream is monitored by a thread, before the |
| 2563 | * flush is done after a hangup and if the stream is not flagged with data |
| 2564 | * since there might be nothing to consume in the wait fd but still have |
| 2565 | * data available flagged by the consumer wake up pipe. |
| 2566 | */ |
| 2567 | if (stream->monitor && !stream->hangup_flush_done && !stream->has_data) { |
| 2568 | char dummy; |
| 2569 | ssize_t readlen; |
| 2570 | |
| 2571 | readlen = lttng_read(stream->wait_fd, &dummy, 1); |
| 2572 | if (readlen < 0 && errno != EAGAIN && errno != EWOULDBLOCK) { |
| 2573 | ret = readlen; |
| 2574 | goto end; |
| 2575 | } |
| 2576 | } |
| 2577 | |
| 2578 | retry: |
| 2579 | /* Get the next subbuffer */ |
| 2580 | err = ustctl_get_next_subbuf(ustream); |
| 2581 | if (err != 0) { |
| 2582 | /* |
| 2583 | * Populate metadata info if the existing info has |
| 2584 | * already been read. |
| 2585 | */ |
| 2586 | if (stream->metadata_flag) { |
| 2587 | ret = commit_one_metadata_packet(stream); |
| 2588 | if (ret <= 0) { |
| 2589 | goto end; |
| 2590 | } |
| 2591 | ustctl_flush_buffer(stream->ustream, 1); |
| 2592 | goto retry; |
| 2593 | } |
| 2594 | |
| 2595 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
| 2596 | /* |
| 2597 | * This is a debug message even for single-threaded consumer, |
| 2598 | * because poll() have more relaxed criterions than get subbuf, |
| 2599 | * so get_subbuf may fail for short race windows where poll() |
| 2600 | * would issue wakeups. |
| 2601 | */ |
| 2602 | DBG("Reserving sub buffer failed (everything is normal, " |
| 2603 | "it is due to concurrency) [ret: %d]", err); |
| 2604 | goto end; |
| 2605 | } |
| 2606 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
| 2607 | |
| 2608 | if (!stream->metadata_flag) { |
| 2609 | index.offset = htobe64(stream->out_fd_offset); |
| 2610 | ret = get_index_values(&index, ustream); |
| 2611 | if (ret < 0) { |
| 2612 | err = ustctl_put_subbuf(ustream); |
| 2613 | assert(err == 0); |
| 2614 | goto end; |
| 2615 | } |
| 2616 | |
| 2617 | /* Update the stream's sequence and discarded events count. */ |
| 2618 | ret = update_stream_stats(stream); |
| 2619 | if (ret < 0) { |
| 2620 | PERROR("kernctl_get_events_discarded"); |
| 2621 | err = ustctl_put_subbuf(ustream); |
| 2622 | assert(err == 0); |
| 2623 | goto end; |
| 2624 | } |
| 2625 | } else { |
| 2626 | write_index = 0; |
| 2627 | } |
| 2628 | |
| 2629 | /* Get the full padded subbuffer size */ |
| 2630 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
| 2631 | assert(err == 0); |
| 2632 | |
| 2633 | /* Get subbuffer data size (without padding) */ |
| 2634 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
| 2635 | assert(err == 0); |
| 2636 | |
| 2637 | /* Make sure we don't get a subbuffer size bigger than the padded */ |
| 2638 | assert(len >= subbuf_size); |
| 2639 | |
| 2640 | padding = len - subbuf_size; |
| 2641 | /* write the subbuffer to the tracefile */ |
| 2642 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding, &index); |
| 2643 | /* |
| 2644 | * The mmap operation should write subbuf_size amount of data when network |
| 2645 | * streaming or the full padding (len) size when we are _not_ streaming. |
| 2646 | */ |
| 2647 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
| 2648 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { |
| 2649 | /* |
| 2650 | * Display the error but continue processing to try to release the |
| 2651 | * subbuffer. This is a DBG statement since any unexpected kill or |
| 2652 | * signal, the application gets unregistered, relayd gets closed or |
| 2653 | * anything that affects the buffer lifetime will trigger this error. |
| 2654 | * So, for the sake of the user, don't print this error since it can |
| 2655 | * happen and it is OK with the code flow. |
| 2656 | */ |
| 2657 | DBG("Error writing to tracefile " |
| 2658 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
| 2659 | ret, len, subbuf_size); |
| 2660 | write_index = 0; |
| 2661 | } |
| 2662 | err = ustctl_put_next_subbuf(ustream); |
| 2663 | assert(err == 0); |
| 2664 | |
| 2665 | /* |
| 2666 | * This will consumer the byte on the wait_fd if and only if there is not |
| 2667 | * next subbuffer to be acquired. |
| 2668 | */ |
| 2669 | if (!stream->metadata_flag) { |
| 2670 | ret = notify_if_more_data(stream, ctx); |
| 2671 | if (ret < 0) { |
| 2672 | goto end; |
| 2673 | } |
| 2674 | } |
| 2675 | |
| 2676 | /* Write index if needed. */ |
| 2677 | if (!write_index) { |
| 2678 | goto end; |
| 2679 | } |
| 2680 | |
| 2681 | if (stream->chan->live_timer_interval && !stream->metadata_flag) { |
| 2682 | /* |
| 2683 | * In live, block until all the metadata is sent. |
| 2684 | */ |
| 2685 | pthread_mutex_lock(&stream->metadata_timer_lock); |
| 2686 | assert(!stream->missed_metadata_flush); |
| 2687 | stream->waiting_on_metadata = true; |
| 2688 | pthread_mutex_unlock(&stream->metadata_timer_lock); |
| 2689 | |
| 2690 | err = consumer_stream_sync_metadata(ctx, stream->session_id); |
| 2691 | |
| 2692 | pthread_mutex_lock(&stream->metadata_timer_lock); |
| 2693 | stream->waiting_on_metadata = false; |
| 2694 | if (stream->missed_metadata_flush) { |
| 2695 | stream->missed_metadata_flush = false; |
| 2696 | pthread_mutex_unlock(&stream->metadata_timer_lock); |
| 2697 | (void) consumer_flush_ust_index(stream); |
| 2698 | } else { |
| 2699 | pthread_mutex_unlock(&stream->metadata_timer_lock); |
| 2700 | } |
| 2701 | |
| 2702 | if (err < 0) { |
| 2703 | goto end; |
| 2704 | } |
| 2705 | } |
| 2706 | |
| 2707 | assert(!stream->metadata_flag); |
| 2708 | err = consumer_stream_write_index(stream, &index); |
| 2709 | if (err < 0) { |
| 2710 | goto end; |
| 2711 | } |
| 2712 | |
| 2713 | end: |
| 2714 | return ret; |
| 2715 | } |
| 2716 | |
| 2717 | /* |
| 2718 | * Called when a stream is created. |
| 2719 | * |
| 2720 | * Return 0 on success or else a negative value. |
| 2721 | */ |
| 2722 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
| 2723 | { |
| 2724 | int ret; |
| 2725 | |
| 2726 | assert(stream); |
| 2727 | |
| 2728 | /* Don't create anything if this is set for streaming. */ |
| 2729 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { |
| 2730 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
| 2731 | stream->chan->tracefile_size, stream->tracefile_count_current, |
| 2732 | stream->uid, stream->gid, NULL); |
| 2733 | if (ret < 0) { |
| 2734 | goto error; |
| 2735 | } |
| 2736 | stream->out_fd = ret; |
| 2737 | stream->tracefile_size_current = 0; |
| 2738 | |
| 2739 | if (!stream->metadata_flag) { |
| 2740 | struct lttng_index_file *index_file; |
| 2741 | |
| 2742 | index_file = lttng_index_file_create(stream->chan->pathname, |
| 2743 | stream->name, stream->uid, stream->gid, |
| 2744 | stream->chan->tracefile_size, |
| 2745 | stream->tracefile_count_current, |
| 2746 | CTF_INDEX_MAJOR, CTF_INDEX_MINOR); |
| 2747 | if (!index_file) { |
| 2748 | goto error; |
| 2749 | } |
| 2750 | assert(!stream->index_file); |
| 2751 | stream->index_file = index_file; |
| 2752 | } |
| 2753 | } |
| 2754 | ret = 0; |
| 2755 | |
| 2756 | error: |
| 2757 | return ret; |
| 2758 | } |
| 2759 | |
| 2760 | /* |
| 2761 | * Check if data is still being extracted from the buffers for a specific |
| 2762 | * stream. Consumer data lock MUST be acquired before calling this function |
| 2763 | * and the stream lock. |
| 2764 | * |
| 2765 | * Return 1 if the traced data are still getting read else 0 meaning that the |
| 2766 | * data is available for trace viewer reading. |
| 2767 | */ |
| 2768 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
| 2769 | { |
| 2770 | int ret; |
| 2771 | |
| 2772 | assert(stream); |
| 2773 | assert(stream->ustream); |
| 2774 | |
| 2775 | DBG("UST consumer checking data pending"); |
| 2776 | |
| 2777 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
| 2778 | ret = 0; |
| 2779 | goto end; |
| 2780 | } |
| 2781 | |
| 2782 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
| 2783 | uint64_t contiguous, pushed; |
| 2784 | |
| 2785 | /* Ease our life a bit. */ |
| 2786 | contiguous = stream->chan->metadata_cache->max_offset; |
| 2787 | pushed = stream->ust_metadata_pushed; |
| 2788 | |
| 2789 | /* |
| 2790 | * We can simply check whether all contiguously available data |
| 2791 | * has been pushed to the ring buffer, since the push operation |
| 2792 | * is performed within get_next_subbuf(), and because both |
| 2793 | * get_next_subbuf() and put_next_subbuf() are issued atomically |
| 2794 | * thanks to the stream lock within |
| 2795 | * lttng_ustconsumer_read_subbuffer(). This basically means that |
| 2796 | * whetnever ust_metadata_pushed is incremented, the associated |
| 2797 | * metadata has been consumed from the metadata stream. |
| 2798 | */ |
| 2799 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, |
| 2800 | contiguous, pushed); |
| 2801 | assert(((int64_t) (contiguous - pushed)) >= 0); |
| 2802 | if ((contiguous != pushed) || |
| 2803 | (((int64_t) contiguous - pushed) > 0 || contiguous == 0)) { |
| 2804 | ret = 1; /* Data is pending */ |
| 2805 | goto end; |
| 2806 | } |
| 2807 | } else { |
| 2808 | ret = ustctl_get_next_subbuf(stream->ustream); |
| 2809 | if (ret == 0) { |
| 2810 | /* |
| 2811 | * There is still data so let's put back this |
| 2812 | * subbuffer. |
| 2813 | */ |
| 2814 | ret = ustctl_put_subbuf(stream->ustream); |
| 2815 | assert(ret == 0); |
| 2816 | ret = 1; /* Data is pending */ |
| 2817 | goto end; |
| 2818 | } |
| 2819 | } |
| 2820 | |
| 2821 | /* Data is NOT pending so ready to be read. */ |
| 2822 | ret = 0; |
| 2823 | |
| 2824 | end: |
| 2825 | return ret; |
| 2826 | } |
| 2827 | |
| 2828 | /* |
| 2829 | * Stop a given metadata channel timer if enabled and close the wait fd which |
| 2830 | * is the poll pipe of the metadata stream. |
| 2831 | * |
| 2832 | * This MUST be called with the metadata channel acquired. |
| 2833 | */ |
| 2834 | void lttng_ustconsumer_close_metadata(struct lttng_consumer_channel *metadata) |
| 2835 | { |
| 2836 | int ret; |
| 2837 | |
| 2838 | assert(metadata); |
| 2839 | assert(metadata->type == CONSUMER_CHANNEL_TYPE_METADATA); |
| 2840 | |
| 2841 | DBG("Closing metadata channel key %" PRIu64, metadata->key); |
| 2842 | |
| 2843 | if (metadata->switch_timer_enabled == 1) { |
| 2844 | consumer_timer_switch_stop(metadata); |
| 2845 | } |
| 2846 | |
| 2847 | if (!metadata->metadata_stream) { |
| 2848 | goto end; |
| 2849 | } |
| 2850 | |
| 2851 | /* |
| 2852 | * Closing write side so the thread monitoring the stream wakes up if any |
| 2853 | * and clean the metadata stream. |
| 2854 | */ |
| 2855 | if (metadata->metadata_stream->ust_metadata_poll_pipe[1] >= 0) { |
| 2856 | ret = close(metadata->metadata_stream->ust_metadata_poll_pipe[1]); |
| 2857 | if (ret < 0) { |
| 2858 | PERROR("closing metadata pipe write side"); |
| 2859 | } |
| 2860 | metadata->metadata_stream->ust_metadata_poll_pipe[1] = -1; |
| 2861 | } |
| 2862 | |
| 2863 | end: |
| 2864 | return; |
| 2865 | } |
| 2866 | |
| 2867 | /* |
| 2868 | * Close every metadata stream wait fd of the metadata hash table. This |
| 2869 | * function MUST be used very carefully so not to run into a race between the |
| 2870 | * metadata thread handling streams and this function closing their wait fd. |
| 2871 | * |
| 2872 | * For UST, this is used when the session daemon hangs up. Its the metadata |
| 2873 | * producer so calling this is safe because we are assured that no state change |
| 2874 | * can occur in the metadata thread for the streams in the hash table. |
| 2875 | */ |
| 2876 | void lttng_ustconsumer_close_all_metadata(struct lttng_ht *metadata_ht) |
| 2877 | { |
| 2878 | struct lttng_ht_iter iter; |
| 2879 | struct lttng_consumer_stream *stream; |
| 2880 | |
| 2881 | assert(metadata_ht); |
| 2882 | assert(metadata_ht->ht); |
| 2883 | |
| 2884 | DBG("UST consumer closing all metadata streams"); |
| 2885 | |
| 2886 | rcu_read_lock(); |
| 2887 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, |
| 2888 | node.node) { |
| 2889 | |
| 2890 | health_code_update(); |
| 2891 | |
| 2892 | pthread_mutex_lock(&stream->chan->lock); |
| 2893 | lttng_ustconsumer_close_metadata(stream->chan); |
| 2894 | pthread_mutex_unlock(&stream->chan->lock); |
| 2895 | |
| 2896 | } |
| 2897 | rcu_read_unlock(); |
| 2898 | } |
| 2899 | |
| 2900 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) |
| 2901 | { |
| 2902 | int ret; |
| 2903 | |
| 2904 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); |
| 2905 | if (ret < 0) { |
| 2906 | ERR("Unable to close wakeup fd"); |
| 2907 | } |
| 2908 | } |
| 2909 | |
| 2910 | /* |
| 2911 | * Please refer to consumer-timer.c before adding any lock within this |
| 2912 | * function or any of its callees. Timers have a very strict locking |
| 2913 | * semantic with respect to teardown. Failure to respect this semantic |
| 2914 | * introduces deadlocks. |
| 2915 | * |
| 2916 | * DON'T hold the metadata lock when calling this function, else this |
| 2917 | * can cause deadlock involving consumer awaiting for metadata to be |
| 2918 | * pushed out due to concurrent interaction with the session daemon. |
| 2919 | */ |
| 2920 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
| 2921 | struct lttng_consumer_channel *channel, int timer, int wait) |
| 2922 | { |
| 2923 | struct lttcomm_metadata_request_msg request; |
| 2924 | struct lttcomm_consumer_msg msg; |
| 2925 | enum lttcomm_return_code ret_code = LTTCOMM_CONSUMERD_SUCCESS; |
| 2926 | uint64_t len, key, offset, version; |
| 2927 | int ret; |
| 2928 | |
| 2929 | assert(channel); |
| 2930 | assert(channel->metadata_cache); |
| 2931 | |
| 2932 | memset(&request, 0, sizeof(request)); |
| 2933 | |
| 2934 | /* send the metadata request to sessiond */ |
| 2935 | switch (consumer_data.type) { |
| 2936 | case LTTNG_CONSUMER64_UST: |
| 2937 | request.bits_per_long = 64; |
| 2938 | break; |
| 2939 | case LTTNG_CONSUMER32_UST: |
| 2940 | request.bits_per_long = 32; |
| 2941 | break; |
| 2942 | default: |
| 2943 | request.bits_per_long = 0; |
| 2944 | break; |
| 2945 | } |
| 2946 | |
| 2947 | request.session_id = channel->session_id; |
| 2948 | request.session_id_per_pid = channel->session_id_per_pid; |
| 2949 | /* |
| 2950 | * Request the application UID here so the metadata of that application can |
| 2951 | * be sent back. The channel UID corresponds to the user UID of the session |
| 2952 | * used for the rights on the stream file(s). |
| 2953 | */ |
| 2954 | request.uid = channel->ust_app_uid; |
| 2955 | request.key = channel->key; |
| 2956 | |
| 2957 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
| 2958 | ", per-pid %" PRIu64 ", app UID %u and channel key %" PRIu64, |
| 2959 | request.session_id, request.session_id_per_pid, request.uid, |
| 2960 | request.key); |
| 2961 | |
| 2962 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
| 2963 | |
| 2964 | health_code_update(); |
| 2965 | |
| 2966 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
| 2967 | sizeof(request)); |
| 2968 | if (ret < 0) { |
| 2969 | ERR("Asking metadata to sessiond"); |
| 2970 | goto end; |
| 2971 | } |
| 2972 | |
| 2973 | health_code_update(); |
| 2974 | |
| 2975 | /* Receive the metadata from sessiond */ |
| 2976 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, |
| 2977 | sizeof(msg)); |
| 2978 | if (ret != sizeof(msg)) { |
| 2979 | DBG("Consumer received unexpected message size %d (expects %zu)", |
| 2980 | ret, sizeof(msg)); |
| 2981 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
| 2982 | /* |
| 2983 | * The ret value might 0 meaning an orderly shutdown but this is ok |
| 2984 | * since the caller handles this. |
| 2985 | */ |
| 2986 | goto end; |
| 2987 | } |
| 2988 | |
| 2989 | health_code_update(); |
| 2990 | |
| 2991 | if (msg.cmd_type == LTTNG_ERR_UND) { |
| 2992 | /* No registry found */ |
| 2993 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, |
| 2994 | ret_code); |
| 2995 | ret = 0; |
| 2996 | goto end; |
| 2997 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { |
| 2998 | ERR("Unexpected cmd_type received %d", msg.cmd_type); |
| 2999 | ret = -1; |
| 3000 | goto end; |
| 3001 | } |
| 3002 | |
| 3003 | len = msg.u.push_metadata.len; |
| 3004 | key = msg.u.push_metadata.key; |
| 3005 | offset = msg.u.push_metadata.target_offset; |
| 3006 | version = msg.u.push_metadata.version; |
| 3007 | |
| 3008 | assert(key == channel->key); |
| 3009 | if (len == 0) { |
| 3010 | DBG("No new metadata to receive for key %" PRIu64, key); |
| 3011 | } |
| 3012 | |
| 3013 | health_code_update(); |
| 3014 | |
| 3015 | /* Tell session daemon we are ready to receive the metadata. */ |
| 3016 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, |
| 3017 | LTTCOMM_CONSUMERD_SUCCESS); |
| 3018 | if (ret < 0 || len == 0) { |
| 3019 | /* |
| 3020 | * Somehow, the session daemon is not responding anymore or there is |
| 3021 | * nothing to receive. |
| 3022 | */ |
| 3023 | goto end; |
| 3024 | } |
| 3025 | |
| 3026 | health_code_update(); |
| 3027 | |
| 3028 | ret = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
| 3029 | key, offset, len, version, channel, timer, wait); |
| 3030 | if (ret >= 0) { |
| 3031 | /* |
| 3032 | * Only send the status msg if the sessiond is alive meaning a positive |
| 3033 | * ret code. |
| 3034 | */ |
| 3035 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret); |
| 3036 | } |
| 3037 | ret = 0; |
| 3038 | |
| 3039 | end: |
| 3040 | health_code_update(); |
| 3041 | |
| 3042 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
| 3043 | return ret; |
| 3044 | } |
| 3045 | |
| 3046 | /* |
| 3047 | * Return the ustctl call for the get stream id. |
| 3048 | */ |
| 3049 | int lttng_ustconsumer_get_stream_id(struct lttng_consumer_stream *stream, |
| 3050 | uint64_t *stream_id) |
| 3051 | { |
| 3052 | assert(stream); |
| 3053 | assert(stream_id); |
| 3054 | |
| 3055 | return ustctl_get_stream_id(stream->ustream, stream_id); |
| 3056 | } |