| 1 | /* |
| 2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License, version 2 only, |
| 7 | * as published by the Free Software Foundation. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along |
| 15 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 16 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 17 | */ |
| 18 | |
| 19 | #define _GNU_SOURCE |
| 20 | #include <assert.h> |
| 21 | #include <lttng/ust-ctl.h> |
| 22 | #include <poll.h> |
| 23 | #include <pthread.h> |
| 24 | #include <stdlib.h> |
| 25 | #include <string.h> |
| 26 | #include <sys/mman.h> |
| 27 | #include <sys/socket.h> |
| 28 | #include <sys/stat.h> |
| 29 | #include <sys/types.h> |
| 30 | #include <inttypes.h> |
| 31 | #include <unistd.h> |
| 32 | #include <urcu/list.h> |
| 33 | #include <signal.h> |
| 34 | |
| 35 | #include <common/common.h> |
| 36 | #include <common/sessiond-comm/sessiond-comm.h> |
| 37 | #include <common/relayd/relayd.h> |
| 38 | #include <common/compat/fcntl.h> |
| 39 | #include <common/consumer-metadata-cache.h> |
| 40 | #include <common/consumer-stream.h> |
| 41 | #include <common/consumer-timer.h> |
| 42 | #include <common/utils.h> |
| 43 | |
| 44 | #include "ust-consumer.h" |
| 45 | |
| 46 | extern struct lttng_consumer_global_data consumer_data; |
| 47 | extern int consumer_poll_timeout; |
| 48 | extern volatile int consumer_quit; |
| 49 | |
| 50 | /* |
| 51 | * Free channel object and all streams associated with it. This MUST be used |
| 52 | * only and only if the channel has _NEVER_ been added to the global channel |
| 53 | * hash table. |
| 54 | */ |
| 55 | static void destroy_channel(struct lttng_consumer_channel *channel) |
| 56 | { |
| 57 | struct lttng_consumer_stream *stream, *stmp; |
| 58 | |
| 59 | assert(channel); |
| 60 | |
| 61 | DBG("UST consumer cleaning stream list"); |
| 62 | |
| 63 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, |
| 64 | send_node) { |
| 65 | cds_list_del(&stream->send_node); |
| 66 | ustctl_destroy_stream(stream->ustream); |
| 67 | free(stream); |
| 68 | } |
| 69 | |
| 70 | /* |
| 71 | * If a channel is available meaning that was created before the streams |
| 72 | * were, delete it. |
| 73 | */ |
| 74 | if (channel->uchan) { |
| 75 | lttng_ustconsumer_del_channel(channel); |
| 76 | } |
| 77 | free(channel); |
| 78 | } |
| 79 | |
| 80 | /* |
| 81 | * Add channel to internal consumer state. |
| 82 | * |
| 83 | * Returns 0 on success or else a negative value. |
| 84 | */ |
| 85 | static int add_channel(struct lttng_consumer_channel *channel, |
| 86 | struct lttng_consumer_local_data *ctx) |
| 87 | { |
| 88 | int ret = 0; |
| 89 | |
| 90 | assert(channel); |
| 91 | assert(ctx); |
| 92 | |
| 93 | if (ctx->on_recv_channel != NULL) { |
| 94 | ret = ctx->on_recv_channel(channel); |
| 95 | if (ret == 0) { |
| 96 | ret = consumer_add_channel(channel, ctx); |
| 97 | } else if (ret < 0) { |
| 98 | /* Most likely an ENOMEM. */ |
| 99 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
| 100 | goto error; |
| 101 | } |
| 102 | } else { |
| 103 | ret = consumer_add_channel(channel, ctx); |
| 104 | } |
| 105 | |
| 106 | DBG("UST consumer channel added (key: %" PRIu64 ")", channel->key); |
| 107 | |
| 108 | error: |
| 109 | return ret; |
| 110 | } |
| 111 | |
| 112 | /* |
| 113 | * Allocate and return a consumer channel object. |
| 114 | */ |
| 115 | static struct lttng_consumer_channel *allocate_channel(uint64_t session_id, |
| 116 | const char *pathname, const char *name, uid_t uid, gid_t gid, |
| 117 | uint64_t relayd_id, uint64_t key, enum lttng_event_output output, |
| 118 | uint64_t tracefile_size, uint64_t tracefile_count, |
| 119 | uint64_t session_id_per_pid, unsigned int monitor) |
| 120 | { |
| 121 | assert(pathname); |
| 122 | assert(name); |
| 123 | |
| 124 | return consumer_allocate_channel(key, session_id, pathname, name, uid, |
| 125 | gid, relayd_id, output, tracefile_size, |
| 126 | tracefile_count, session_id_per_pid, monitor); |
| 127 | } |
| 128 | |
| 129 | /* |
| 130 | * Allocate and return a consumer stream object. If _alloc_ret is not NULL, the |
| 131 | * error value if applicable is set in it else it is kept untouched. |
| 132 | * |
| 133 | * Return NULL on error else the newly allocated stream object. |
| 134 | */ |
| 135 | static struct lttng_consumer_stream *allocate_stream(int cpu, int key, |
| 136 | struct lttng_consumer_channel *channel, |
| 137 | struct lttng_consumer_local_data *ctx, int *_alloc_ret) |
| 138 | { |
| 139 | int alloc_ret; |
| 140 | struct lttng_consumer_stream *stream = NULL; |
| 141 | |
| 142 | assert(channel); |
| 143 | assert(ctx); |
| 144 | |
| 145 | stream = consumer_allocate_stream(channel->key, |
| 146 | key, |
| 147 | LTTNG_CONSUMER_ACTIVE_STREAM, |
| 148 | channel->name, |
| 149 | channel->uid, |
| 150 | channel->gid, |
| 151 | channel->relayd_id, |
| 152 | channel->session_id, |
| 153 | cpu, |
| 154 | &alloc_ret, |
| 155 | channel->type, |
| 156 | channel->monitor); |
| 157 | if (stream == NULL) { |
| 158 | switch (alloc_ret) { |
| 159 | case -ENOENT: |
| 160 | /* |
| 161 | * We could not find the channel. Can happen if cpu hotplug |
| 162 | * happens while tearing down. |
| 163 | */ |
| 164 | DBG3("Could not find channel"); |
| 165 | break; |
| 166 | case -ENOMEM: |
| 167 | case -EINVAL: |
| 168 | default: |
| 169 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_OUTFD_ERROR); |
| 170 | break; |
| 171 | } |
| 172 | goto error; |
| 173 | } |
| 174 | |
| 175 | stream->chan = channel; |
| 176 | |
| 177 | error: |
| 178 | if (_alloc_ret) { |
| 179 | *_alloc_ret = alloc_ret; |
| 180 | } |
| 181 | return stream; |
| 182 | } |
| 183 | |
| 184 | /* |
| 185 | * Send the given stream pointer to the corresponding thread. |
| 186 | * |
| 187 | * Returns 0 on success else a negative value. |
| 188 | */ |
| 189 | static int send_stream_to_thread(struct lttng_consumer_stream *stream, |
| 190 | struct lttng_consumer_local_data *ctx) |
| 191 | { |
| 192 | int ret; |
| 193 | struct lttng_pipe *stream_pipe; |
| 194 | |
| 195 | /* Get the right pipe where the stream will be sent. */ |
| 196 | if (stream->metadata_flag) { |
| 197 | ret = consumer_add_metadata_stream(stream); |
| 198 | if (ret) { |
| 199 | ERR("Consumer add metadata stream %" PRIu64 " failed.", |
| 200 | stream->key); |
| 201 | goto error; |
| 202 | } |
| 203 | stream_pipe = ctx->consumer_metadata_pipe; |
| 204 | } else { |
| 205 | ret = consumer_add_data_stream(stream); |
| 206 | if (ret) { |
| 207 | ERR("Consumer add stream %" PRIu64 " failed.", |
| 208 | stream->key); |
| 209 | goto error; |
| 210 | } |
| 211 | stream_pipe = ctx->consumer_data_pipe; |
| 212 | } |
| 213 | |
| 214 | /* |
| 215 | * From this point on, the stream's ownership has been moved away from |
| 216 | * the channel and becomes globally visible. |
| 217 | */ |
| 218 | stream->globally_visible = 1; |
| 219 | |
| 220 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
| 221 | if (ret < 0) { |
| 222 | ERR("Consumer write %s stream to pipe %d", |
| 223 | stream->metadata_flag ? "metadata" : "data", |
| 224 | lttng_pipe_get_writefd(stream_pipe)); |
| 225 | if (stream->metadata_flag) { |
| 226 | consumer_del_stream_for_metadata(stream); |
| 227 | } else { |
| 228 | consumer_del_stream_for_data(stream); |
| 229 | } |
| 230 | } |
| 231 | error: |
| 232 | return ret; |
| 233 | } |
| 234 | |
| 235 | /* |
| 236 | * Create streams for the given channel using liblttng-ust-ctl. |
| 237 | * |
| 238 | * Return 0 on success else a negative value. |
| 239 | */ |
| 240 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
| 241 | struct lttng_consumer_local_data *ctx) |
| 242 | { |
| 243 | int ret, cpu = 0; |
| 244 | struct ustctl_consumer_stream *ustream; |
| 245 | struct lttng_consumer_stream *stream; |
| 246 | |
| 247 | assert(channel); |
| 248 | assert(ctx); |
| 249 | |
| 250 | /* |
| 251 | * While a stream is available from ustctl. When NULL is returned, we've |
| 252 | * reached the end of the possible stream for the channel. |
| 253 | */ |
| 254 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { |
| 255 | int wait_fd; |
| 256 | int ust_metadata_pipe[2]; |
| 257 | |
| 258 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && channel->monitor) { |
| 259 | ret = utils_create_pipe_cloexec_nonblock(ust_metadata_pipe); |
| 260 | if (ret < 0) { |
| 261 | ERR("Create ust metadata poll pipe"); |
| 262 | goto error; |
| 263 | } |
| 264 | wait_fd = ust_metadata_pipe[0]; |
| 265 | } else { |
| 266 | wait_fd = ustctl_stream_get_wait_fd(ustream); |
| 267 | } |
| 268 | |
| 269 | /* Allocate consumer stream object. */ |
| 270 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); |
| 271 | if (!stream) { |
| 272 | goto error_alloc; |
| 273 | } |
| 274 | stream->ustream = ustream; |
| 275 | /* |
| 276 | * Store it so we can save multiple function calls afterwards since |
| 277 | * this value is used heavily in the stream threads. This is UST |
| 278 | * specific so this is why it's done after allocation. |
| 279 | */ |
| 280 | stream->wait_fd = wait_fd; |
| 281 | |
| 282 | /* |
| 283 | * Increment channel refcount since the channel reference has now been |
| 284 | * assigned in the allocation process above. |
| 285 | */ |
| 286 | if (stream->chan->monitor) { |
| 287 | uatomic_inc(&stream->chan->refcount); |
| 288 | } |
| 289 | |
| 290 | /* |
| 291 | * Order is important this is why a list is used. On error, the caller |
| 292 | * should clean this list. |
| 293 | */ |
| 294 | cds_list_add_tail(&stream->send_node, &channel->streams.head); |
| 295 | |
| 296 | ret = ustctl_get_max_subbuf_size(stream->ustream, |
| 297 | &stream->max_sb_size); |
| 298 | if (ret < 0) { |
| 299 | ERR("ustctl_get_max_subbuf_size failed for stream %s", |
| 300 | stream->name); |
| 301 | goto error; |
| 302 | } |
| 303 | |
| 304 | /* Do actions once stream has been received. */ |
| 305 | if (ctx->on_recv_stream) { |
| 306 | ret = ctx->on_recv_stream(stream); |
| 307 | if (ret < 0) { |
| 308 | goto error; |
| 309 | } |
| 310 | } |
| 311 | |
| 312 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
| 313 | stream->name, stream->key, stream->relayd_stream_id); |
| 314 | |
| 315 | /* Set next CPU stream. */ |
| 316 | channel->streams.count = ++cpu; |
| 317 | |
| 318 | /* Keep stream reference when creating metadata. */ |
| 319 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
| 320 | channel->metadata_stream = stream; |
| 321 | stream->ust_metadata_poll_pipe[0] = ust_metadata_pipe[0]; |
| 322 | stream->ust_metadata_poll_pipe[1] = ust_metadata_pipe[1]; |
| 323 | } |
| 324 | } |
| 325 | |
| 326 | return 0; |
| 327 | |
| 328 | error: |
| 329 | error_alloc: |
| 330 | return ret; |
| 331 | } |
| 332 | |
| 333 | /* |
| 334 | * Create an UST channel with the given attributes and send it to the session |
| 335 | * daemon using the ust ctl API. |
| 336 | * |
| 337 | * Return 0 on success or else a negative value. |
| 338 | */ |
| 339 | static int create_ust_channel(struct ustctl_consumer_channel_attr *attr, |
| 340 | struct ustctl_consumer_channel **chanp) |
| 341 | { |
| 342 | int ret; |
| 343 | struct ustctl_consumer_channel *channel; |
| 344 | |
| 345 | assert(attr); |
| 346 | assert(chanp); |
| 347 | |
| 348 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " |
| 349 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " |
| 350 | "switch_timer_interval: %u, read_timer_interval: %u, " |
| 351 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, |
| 352 | attr->num_subbuf, attr->switch_timer_interval, |
| 353 | attr->read_timer_interval, attr->output, attr->type); |
| 354 | |
| 355 | channel = ustctl_create_channel(attr); |
| 356 | if (!channel) { |
| 357 | ret = -1; |
| 358 | goto error_create; |
| 359 | } |
| 360 | |
| 361 | *chanp = channel; |
| 362 | |
| 363 | return 0; |
| 364 | |
| 365 | error_create: |
| 366 | return ret; |
| 367 | } |
| 368 | |
| 369 | /* |
| 370 | * Send a single given stream to the session daemon using the sock. |
| 371 | * |
| 372 | * Return 0 on success else a negative value. |
| 373 | */ |
| 374 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
| 375 | { |
| 376 | int ret; |
| 377 | |
| 378 | assert(stream); |
| 379 | assert(sock >= 0); |
| 380 | |
| 381 | DBG("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
| 382 | |
| 383 | /* Send stream to session daemon. */ |
| 384 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); |
| 385 | if (ret < 0) { |
| 386 | goto error; |
| 387 | } |
| 388 | |
| 389 | error: |
| 390 | return ret; |
| 391 | } |
| 392 | |
| 393 | /* |
| 394 | * Send channel to sessiond. |
| 395 | * |
| 396 | * Return 0 on success or else a negative value. |
| 397 | */ |
| 398 | static int send_sessiond_channel(int sock, |
| 399 | struct lttng_consumer_channel *channel, |
| 400 | struct lttng_consumer_local_data *ctx, int *relayd_error) |
| 401 | { |
| 402 | int ret, ret_code = LTTNG_OK; |
| 403 | struct lttng_consumer_stream *stream; |
| 404 | |
| 405 | assert(channel); |
| 406 | assert(ctx); |
| 407 | assert(sock >= 0); |
| 408 | |
| 409 | DBG("UST consumer sending channel %s to sessiond", channel->name); |
| 410 | |
| 411 | if (channel->relayd_id != (uint64_t) -1ULL) { |
| 412 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
| 413 | /* Try to send the stream to the relayd if one is available. */ |
| 414 | ret = consumer_send_relayd_stream(stream, stream->chan->pathname); |
| 415 | if (ret < 0) { |
| 416 | /* |
| 417 | * Flag that the relayd was the problem here probably due to a |
| 418 | * communicaton error on the socket. |
| 419 | */ |
| 420 | if (relayd_error) { |
| 421 | *relayd_error = 1; |
| 422 | } |
| 423 | ret_code = LTTNG_ERR_RELAYD_CONNECT_FAIL; |
| 424 | } |
| 425 | } |
| 426 | } |
| 427 | |
| 428 | /* Inform sessiond that we are about to send channel and streams. */ |
| 429 | ret = consumer_send_status_msg(sock, ret_code); |
| 430 | if (ret < 0 || ret_code != LTTNG_OK) { |
| 431 | /* |
| 432 | * Either the session daemon is not responding or the relayd died so we |
| 433 | * stop now. |
| 434 | */ |
| 435 | goto error; |
| 436 | } |
| 437 | |
| 438 | /* Send channel to sessiond. */ |
| 439 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); |
| 440 | if (ret < 0) { |
| 441 | goto error; |
| 442 | } |
| 443 | |
| 444 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); |
| 445 | if (ret < 0) { |
| 446 | goto error; |
| 447 | } |
| 448 | |
| 449 | /* The channel was sent successfully to the sessiond at this point. */ |
| 450 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
| 451 | /* Send stream to session daemon. */ |
| 452 | ret = send_sessiond_stream(sock, stream); |
| 453 | if (ret < 0) { |
| 454 | goto error; |
| 455 | } |
| 456 | } |
| 457 | |
| 458 | /* Tell sessiond there is no more stream. */ |
| 459 | ret = ustctl_send_stream_to_sessiond(sock, NULL); |
| 460 | if (ret < 0) { |
| 461 | goto error; |
| 462 | } |
| 463 | |
| 464 | DBG("UST consumer NULL stream sent to sessiond"); |
| 465 | |
| 466 | return 0; |
| 467 | |
| 468 | error: |
| 469 | if (ret_code != LTTNG_OK) { |
| 470 | ret = -1; |
| 471 | } |
| 472 | return ret; |
| 473 | } |
| 474 | |
| 475 | /* |
| 476 | * Creates a channel and streams and add the channel it to the channel internal |
| 477 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is |
| 478 | * received. |
| 479 | * |
| 480 | * Return 0 on success or else, a negative value is returned and the channel |
| 481 | * MUST be destroyed by consumer_del_channel(). |
| 482 | */ |
| 483 | static int ask_channel(struct lttng_consumer_local_data *ctx, int sock, |
| 484 | struct lttng_consumer_channel *channel, |
| 485 | struct ustctl_consumer_channel_attr *attr) |
| 486 | { |
| 487 | int ret; |
| 488 | |
| 489 | assert(ctx); |
| 490 | assert(channel); |
| 491 | assert(attr); |
| 492 | |
| 493 | /* |
| 494 | * This value is still used by the kernel consumer since for the kernel, |
| 495 | * the stream ownership is not IN the consumer so we need to have the |
| 496 | * number of left stream that needs to be initialized so we can know when |
| 497 | * to delete the channel (see consumer.c). |
| 498 | * |
| 499 | * As for the user space tracer now, the consumer creates and sends the |
| 500 | * stream to the session daemon which only sends them to the application |
| 501 | * once every stream of a channel is received making this value useless |
| 502 | * because we they will be added to the poll thread before the application |
| 503 | * receives them. This ensures that a stream can not hang up during |
| 504 | * initilization of a channel. |
| 505 | */ |
| 506 | channel->nb_init_stream_left = 0; |
| 507 | |
| 508 | /* The reply msg status is handled in the following call. */ |
| 509 | ret = create_ust_channel(attr, &channel->uchan); |
| 510 | if (ret < 0) { |
| 511 | goto end; |
| 512 | } |
| 513 | |
| 514 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
| 515 | |
| 516 | /* |
| 517 | * For the snapshots (no monitor), we create the metadata streams |
| 518 | * on demand, not during the channel creation. |
| 519 | */ |
| 520 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { |
| 521 | ret = 0; |
| 522 | goto end; |
| 523 | } |
| 524 | |
| 525 | /* Open all streams for this channel. */ |
| 526 | ret = create_ust_streams(channel, ctx); |
| 527 | if (ret < 0) { |
| 528 | goto end; |
| 529 | } |
| 530 | |
| 531 | end: |
| 532 | return ret; |
| 533 | } |
| 534 | |
| 535 | /* |
| 536 | * Send all stream of a channel to the right thread handling it. |
| 537 | * |
| 538 | * On error, return a negative value else 0 on success. |
| 539 | */ |
| 540 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, |
| 541 | struct lttng_consumer_local_data *ctx) |
| 542 | { |
| 543 | int ret = 0; |
| 544 | struct lttng_consumer_stream *stream, *stmp; |
| 545 | |
| 546 | assert(channel); |
| 547 | assert(ctx); |
| 548 | |
| 549 | /* Send streams to the corresponding thread. */ |
| 550 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, |
| 551 | send_node) { |
| 552 | /* Sending the stream to the thread. */ |
| 553 | ret = send_stream_to_thread(stream, ctx); |
| 554 | if (ret < 0) { |
| 555 | /* |
| 556 | * If we are unable to send the stream to the thread, there is |
| 557 | * a big problem so just stop everything. |
| 558 | */ |
| 559 | /* Remove node from the channel stream list. */ |
| 560 | cds_list_del(&stream->send_node); |
| 561 | goto error; |
| 562 | } |
| 563 | |
| 564 | /* Remove node from the channel stream list. */ |
| 565 | cds_list_del(&stream->send_node); |
| 566 | |
| 567 | } |
| 568 | |
| 569 | error: |
| 570 | return ret; |
| 571 | } |
| 572 | |
| 573 | /* |
| 574 | * Flush channel's streams using the given key to retrieve the channel. |
| 575 | * |
| 576 | * Return 0 on success else an LTTng error code. |
| 577 | */ |
| 578 | static int flush_channel(uint64_t chan_key) |
| 579 | { |
| 580 | int ret = 0; |
| 581 | struct lttng_consumer_channel *channel; |
| 582 | struct lttng_consumer_stream *stream; |
| 583 | struct lttng_ht *ht; |
| 584 | struct lttng_ht_iter iter; |
| 585 | |
| 586 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
| 587 | |
| 588 | rcu_read_lock(); |
| 589 | channel = consumer_find_channel(chan_key); |
| 590 | if (!channel) { |
| 591 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
| 592 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 593 | goto error; |
| 594 | } |
| 595 | |
| 596 | ht = consumer_data.stream_per_chan_id_ht; |
| 597 | |
| 598 | /* For each stream of the channel id, flush it. */ |
| 599 | cds_lfht_for_each_entry_duplicate(ht->ht, |
| 600 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, |
| 601 | &channel->key, &iter.iter, stream, node_channel_id.node) { |
| 602 | ustctl_flush_buffer(stream->ustream, 1); |
| 603 | } |
| 604 | error: |
| 605 | rcu_read_unlock(); |
| 606 | return ret; |
| 607 | } |
| 608 | |
| 609 | /* |
| 610 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. |
| 611 | * RCU read side lock MUST be acquired before calling this function. |
| 612 | * |
| 613 | * Return 0 on success else an LTTng error code. |
| 614 | */ |
| 615 | static int close_metadata(uint64_t chan_key) |
| 616 | { |
| 617 | int ret = 0; |
| 618 | struct lttng_consumer_channel *channel; |
| 619 | |
| 620 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
| 621 | |
| 622 | channel = consumer_find_channel(chan_key); |
| 623 | if (!channel) { |
| 624 | /* |
| 625 | * This is possible if the metadata thread has issue a delete because |
| 626 | * the endpoint point of the stream hung up. There is no way the |
| 627 | * session daemon can know about it thus use a DBG instead of an actual |
| 628 | * error. |
| 629 | */ |
| 630 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); |
| 631 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 632 | goto error; |
| 633 | } |
| 634 | |
| 635 | pthread_mutex_lock(&consumer_data.lock); |
| 636 | pthread_mutex_lock(&channel->lock); |
| 637 | |
| 638 | if (cds_lfht_is_node_deleted(&channel->node.node)) { |
| 639 | goto error_unlock; |
| 640 | } |
| 641 | |
| 642 | if (channel->switch_timer_enabled == 1) { |
| 643 | DBG("Deleting timer on metadata channel"); |
| 644 | consumer_timer_switch_stop(channel); |
| 645 | } |
| 646 | |
| 647 | if (channel->metadata_stream) { |
| 648 | ret = ustctl_stream_close_wakeup_fd(channel->metadata_stream->ustream); |
| 649 | if (ret < 0) { |
| 650 | ERR("UST consumer unable to close fd of metadata (ret: %d)", ret); |
| 651 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; |
| 652 | goto error_unlock; |
| 653 | } |
| 654 | if (channel->monitor) { |
| 655 | /* close the read-side in consumer_del_metadata_stream */ |
| 656 | ret = close(channel->metadata_stream->ust_metadata_poll_pipe[1]); |
| 657 | if (ret < 0) { |
| 658 | PERROR("Close UST metadata write-side poll pipe"); |
| 659 | } |
| 660 | } |
| 661 | } |
| 662 | |
| 663 | error_unlock: |
| 664 | pthread_mutex_unlock(&channel->lock); |
| 665 | pthread_mutex_unlock(&consumer_data.lock); |
| 666 | error: |
| 667 | return ret; |
| 668 | } |
| 669 | |
| 670 | /* |
| 671 | * RCU read side lock MUST be acquired before calling this function. |
| 672 | * |
| 673 | * Return 0 on success else an LTTng error code. |
| 674 | */ |
| 675 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) |
| 676 | { |
| 677 | int ret; |
| 678 | struct lttng_consumer_channel *metadata; |
| 679 | |
| 680 | DBG("UST consumer setup metadata key %" PRIu64, key); |
| 681 | |
| 682 | metadata = consumer_find_channel(key); |
| 683 | if (!metadata) { |
| 684 | ERR("UST consumer push metadata %" PRIu64 " not found", key); |
| 685 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 686 | goto end; |
| 687 | } |
| 688 | |
| 689 | /* |
| 690 | * In no monitor mode, the metadata channel has no stream(s) so skip the |
| 691 | * ownership transfer to the metadata thread. |
| 692 | */ |
| 693 | if (!metadata->monitor) { |
| 694 | DBG("Metadata channel in no monitor"); |
| 695 | ret = 0; |
| 696 | goto end; |
| 697 | } |
| 698 | |
| 699 | /* |
| 700 | * Send metadata stream to relayd if one available. Availability is |
| 701 | * known if the stream is still in the list of the channel. |
| 702 | */ |
| 703 | if (cds_list_empty(&metadata->streams.head)) { |
| 704 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); |
| 705 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; |
| 706 | goto error_no_stream; |
| 707 | } |
| 708 | |
| 709 | /* Send metadata stream to relayd if needed. */ |
| 710 | if (metadata->metadata_stream->net_seq_idx != (uint64_t) -1ULL) { |
| 711 | ret = consumer_send_relayd_stream(metadata->metadata_stream, |
| 712 | metadata->pathname); |
| 713 | if (ret < 0) { |
| 714 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; |
| 715 | goto error; |
| 716 | } |
| 717 | } |
| 718 | |
| 719 | ret = send_streams_to_thread(metadata, ctx); |
| 720 | if (ret < 0) { |
| 721 | /* |
| 722 | * If we are unable to send the stream to the thread, there is |
| 723 | * a big problem so just stop everything. |
| 724 | */ |
| 725 | ret = LTTCOMM_CONSUMERD_FATAL; |
| 726 | goto error; |
| 727 | } |
| 728 | /* List MUST be empty after or else it could be reused. */ |
| 729 | assert(cds_list_empty(&metadata->streams.head)); |
| 730 | |
| 731 | ret = 0; |
| 732 | goto end; |
| 733 | |
| 734 | error: |
| 735 | /* |
| 736 | * Delete metadata channel on error. At this point, the metadata stream can |
| 737 | * NOT be monitored by the metadata thread thus having the guarantee that |
| 738 | * the stream is still in the local stream list of the channel. This call |
| 739 | * will make sure to clean that list. |
| 740 | */ |
| 741 | cds_list_del(&metadata->metadata_stream->send_node); |
| 742 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
| 743 | error_no_stream: |
| 744 | end: |
| 745 | return ret; |
| 746 | } |
| 747 | |
| 748 | /* |
| 749 | * Snapshot the whole metadata. |
| 750 | * |
| 751 | * Returns 0 on success, < 0 on error |
| 752 | */ |
| 753 | static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id, |
| 754 | struct lttng_consumer_local_data *ctx) |
| 755 | { |
| 756 | int ret = 0; |
| 757 | struct lttng_consumer_channel *metadata_channel; |
| 758 | struct lttng_consumer_stream *metadata_stream; |
| 759 | |
| 760 | assert(path); |
| 761 | assert(ctx); |
| 762 | |
| 763 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", |
| 764 | key, path); |
| 765 | |
| 766 | rcu_read_lock(); |
| 767 | |
| 768 | metadata_channel = consumer_find_channel(key); |
| 769 | if (!metadata_channel) { |
| 770 | ERR("UST snapshot metadata channel not found for key %lu", key); |
| 771 | ret = -1; |
| 772 | goto error; |
| 773 | } |
| 774 | assert(!metadata_channel->monitor); |
| 775 | |
| 776 | /* |
| 777 | * Ask the sessiond if we have new metadata waiting and update the |
| 778 | * consumer metadata cache. |
| 779 | */ |
| 780 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel, 0); |
| 781 | if (ret < 0) { |
| 782 | goto error; |
| 783 | } |
| 784 | |
| 785 | /* |
| 786 | * The metadata stream is NOT created in no monitor mode when the channel |
| 787 | * is created on a sessiond ask channel command. |
| 788 | */ |
| 789 | ret = create_ust_streams(metadata_channel, ctx); |
| 790 | if (ret < 0) { |
| 791 | goto error; |
| 792 | } |
| 793 | |
| 794 | metadata_stream = metadata_channel->metadata_stream; |
| 795 | assert(metadata_stream); |
| 796 | |
| 797 | if (relayd_id != (uint64_t) -1ULL) { |
| 798 | metadata_stream->net_seq_idx = relayd_id; |
| 799 | ret = consumer_send_relayd_stream(metadata_stream, path); |
| 800 | if (ret < 0) { |
| 801 | goto error_stream; |
| 802 | } |
| 803 | } else { |
| 804 | ret = utils_create_stream_file(path, metadata_stream->name, |
| 805 | metadata_stream->chan->tracefile_size, |
| 806 | metadata_stream->tracefile_count_current, |
| 807 | metadata_stream->uid, metadata_stream->gid); |
| 808 | if (ret < 0) { |
| 809 | goto error_stream; |
| 810 | } |
| 811 | metadata_stream->out_fd = ret; |
| 812 | metadata_stream->tracefile_size_current = 0; |
| 813 | } |
| 814 | |
| 815 | pthread_mutex_lock(&metadata_channel->metadata_cache->lock); |
| 816 | |
| 817 | do { |
| 818 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); |
| 819 | if (ret < 0) { |
| 820 | goto error_unlock; |
| 821 | } |
| 822 | } while (ret > 0); |
| 823 | |
| 824 | error_unlock: |
| 825 | pthread_mutex_unlock(&metadata_channel->metadata_cache->lock); |
| 826 | |
| 827 | error_stream: |
| 828 | /* |
| 829 | * Clean up the stream completly because the next snapshot will use a new |
| 830 | * metadata stream. |
| 831 | */ |
| 832 | cds_list_del(&metadata_stream->send_node); |
| 833 | consumer_stream_destroy(metadata_stream, NULL); |
| 834 | metadata_channel->metadata_stream = NULL; |
| 835 | |
| 836 | error: |
| 837 | rcu_read_unlock(); |
| 838 | return ret; |
| 839 | } |
| 840 | |
| 841 | /* |
| 842 | * Take a snapshot of all the stream of a channel. |
| 843 | * |
| 844 | * Returns 0 on success, < 0 on error |
| 845 | */ |
| 846 | static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id, |
| 847 | uint64_t max_stream_size, struct lttng_consumer_local_data *ctx) |
| 848 | { |
| 849 | int ret; |
| 850 | unsigned use_relayd = 0; |
| 851 | unsigned long consumed_pos, produced_pos; |
| 852 | struct lttng_consumer_channel *channel; |
| 853 | struct lttng_consumer_stream *stream; |
| 854 | |
| 855 | assert(path); |
| 856 | assert(ctx); |
| 857 | |
| 858 | rcu_read_lock(); |
| 859 | |
| 860 | if (relayd_id != (uint64_t) -1ULL) { |
| 861 | use_relayd = 1; |
| 862 | } |
| 863 | |
| 864 | channel = consumer_find_channel(key); |
| 865 | if (!channel) { |
| 866 | ERR("UST snapshot channel not found for key %lu", key); |
| 867 | ret = -1; |
| 868 | goto error; |
| 869 | } |
| 870 | assert(!channel->monitor); |
| 871 | DBG("UST consumer snapshot channel %lu", key); |
| 872 | |
| 873 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
| 874 | /* Lock stream because we are about to change its state. */ |
| 875 | pthread_mutex_lock(&stream->lock); |
| 876 | stream->net_seq_idx = relayd_id; |
| 877 | |
| 878 | if (use_relayd) { |
| 879 | ret = consumer_send_relayd_stream(stream, path); |
| 880 | if (ret < 0) { |
| 881 | goto error_unlock; |
| 882 | } |
| 883 | } else { |
| 884 | ret = utils_create_stream_file(path, stream->name, |
| 885 | stream->chan->tracefile_size, |
| 886 | stream->tracefile_count_current, |
| 887 | stream->uid, stream->gid); |
| 888 | if (ret < 0) { |
| 889 | goto error_unlock; |
| 890 | } |
| 891 | stream->out_fd = ret; |
| 892 | stream->tracefile_size_current = 0; |
| 893 | |
| 894 | DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path, |
| 895 | stream->name, stream->key); |
| 896 | } |
| 897 | |
| 898 | ustctl_flush_buffer(stream->ustream, 1); |
| 899 | |
| 900 | ret = lttng_ustconsumer_take_snapshot(stream); |
| 901 | if (ret < 0) { |
| 902 | ERR("Taking UST snapshot"); |
| 903 | goto error_unlock; |
| 904 | } |
| 905 | |
| 906 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); |
| 907 | if (ret < 0) { |
| 908 | ERR("Produced UST snapshot position"); |
| 909 | goto error_unlock; |
| 910 | } |
| 911 | |
| 912 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); |
| 913 | if (ret < 0) { |
| 914 | ERR("Consumerd UST snapshot position"); |
| 915 | goto error_unlock; |
| 916 | } |
| 917 | |
| 918 | /* |
| 919 | * The original value is sent back if max stream size is larger than |
| 920 | * the possible size of the snapshot. Also, we asume that the session |
| 921 | * daemon should never send a maximum stream size that is lower than |
| 922 | * subbuffer size. |
| 923 | */ |
| 924 | consumed_pos = consumer_get_consumed_maxsize(consumed_pos, |
| 925 | produced_pos, max_stream_size); |
| 926 | |
| 927 | while (consumed_pos < produced_pos) { |
| 928 | ssize_t read_len; |
| 929 | unsigned long len, padded_len; |
| 930 | |
| 931 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
| 932 | |
| 933 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); |
| 934 | if (ret < 0) { |
| 935 | if (ret != -EAGAIN) { |
| 936 | PERROR("ustctl_get_subbuf snapshot"); |
| 937 | goto error_close_stream; |
| 938 | } |
| 939 | DBG("UST consumer get subbuf failed. Skipping it."); |
| 940 | consumed_pos += stream->max_sb_size; |
| 941 | continue; |
| 942 | } |
| 943 | |
| 944 | ret = ustctl_get_subbuf_size(stream->ustream, &len); |
| 945 | if (ret < 0) { |
| 946 | ERR("Snapshot ustctl_get_subbuf_size"); |
| 947 | goto error_put_subbuf; |
| 948 | } |
| 949 | |
| 950 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); |
| 951 | if (ret < 0) { |
| 952 | ERR("Snapshot ustctl_get_padded_subbuf_size"); |
| 953 | goto error_put_subbuf; |
| 954 | } |
| 955 | |
| 956 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, |
| 957 | padded_len - len); |
| 958 | if (use_relayd) { |
| 959 | if (read_len != len) { |
| 960 | ret = -1; |
| 961 | goto error_put_subbuf; |
| 962 | } |
| 963 | } else { |
| 964 | if (read_len != padded_len) { |
| 965 | ret = -1; |
| 966 | goto error_put_subbuf; |
| 967 | } |
| 968 | } |
| 969 | |
| 970 | ret = ustctl_put_subbuf(stream->ustream); |
| 971 | if (ret < 0) { |
| 972 | ERR("Snapshot ustctl_put_subbuf"); |
| 973 | goto error_close_stream; |
| 974 | } |
| 975 | consumed_pos += stream->max_sb_size; |
| 976 | } |
| 977 | |
| 978 | /* Simply close the stream so we can use it on the next snapshot. */ |
| 979 | consumer_stream_close(stream); |
| 980 | pthread_mutex_unlock(&stream->lock); |
| 981 | } |
| 982 | |
| 983 | rcu_read_unlock(); |
| 984 | return 0; |
| 985 | |
| 986 | error_put_subbuf: |
| 987 | if (ustctl_put_subbuf(stream->ustream) < 0) { |
| 988 | ERR("Snapshot ustctl_put_subbuf"); |
| 989 | } |
| 990 | error_close_stream: |
| 991 | consumer_stream_close(stream); |
| 992 | error_unlock: |
| 993 | pthread_mutex_unlock(&stream->lock); |
| 994 | error: |
| 995 | rcu_read_unlock(); |
| 996 | return ret; |
| 997 | } |
| 998 | |
| 999 | /* |
| 1000 | * Receive the metadata updates from the sessiond. |
| 1001 | */ |
| 1002 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, |
| 1003 | uint64_t len, struct lttng_consumer_channel *channel, |
| 1004 | int timer) |
| 1005 | { |
| 1006 | int ret, ret_code = LTTNG_OK; |
| 1007 | char *metadata_str; |
| 1008 | |
| 1009 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
| 1010 | |
| 1011 | metadata_str = zmalloc(len * sizeof(char)); |
| 1012 | if (!metadata_str) { |
| 1013 | PERROR("zmalloc metadata string"); |
| 1014 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
| 1015 | goto end; |
| 1016 | } |
| 1017 | |
| 1018 | /* Receive metadata string. */ |
| 1019 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); |
| 1020 | if (ret < 0) { |
| 1021 | /* Session daemon is dead so return gracefully. */ |
| 1022 | ret_code = ret; |
| 1023 | goto end_free; |
| 1024 | } |
| 1025 | |
| 1026 | pthread_mutex_lock(&channel->metadata_cache->lock); |
| 1027 | ret = consumer_metadata_cache_write(channel, offset, len, metadata_str); |
| 1028 | if (ret < 0) { |
| 1029 | /* Unable to handle metadata. Notify session daemon. */ |
| 1030 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
| 1031 | /* |
| 1032 | * Skip metadata flush on write error since the offset and len might |
| 1033 | * not have been updated which could create an infinite loop below when |
| 1034 | * waiting for the metadata cache to be flushed. |
| 1035 | */ |
| 1036 | pthread_mutex_unlock(&channel->metadata_cache->lock); |
| 1037 | goto end_free; |
| 1038 | } |
| 1039 | pthread_mutex_unlock(&channel->metadata_cache->lock); |
| 1040 | |
| 1041 | while (consumer_metadata_cache_flushed(channel, offset + len, timer)) { |
| 1042 | DBG("Waiting for metadata to be flushed"); |
| 1043 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
| 1044 | } |
| 1045 | |
| 1046 | end_free: |
| 1047 | free(metadata_str); |
| 1048 | end: |
| 1049 | return ret_code; |
| 1050 | } |
| 1051 | |
| 1052 | /* |
| 1053 | * Receive command from session daemon and process it. |
| 1054 | * |
| 1055 | * Return 1 on success else a negative value or 0. |
| 1056 | */ |
| 1057 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
| 1058 | int sock, struct pollfd *consumer_sockpoll) |
| 1059 | { |
| 1060 | ssize_t ret; |
| 1061 | enum lttng_error_code ret_code = LTTNG_OK; |
| 1062 | struct lttcomm_consumer_msg msg; |
| 1063 | struct lttng_consumer_channel *channel = NULL; |
| 1064 | |
| 1065 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
| 1066 | if (ret != sizeof(msg)) { |
| 1067 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
| 1068 | ret, sizeof(msg)); |
| 1069 | /* |
| 1070 | * The ret value might 0 meaning an orderly shutdown but this is ok |
| 1071 | * since the caller handles this. |
| 1072 | */ |
| 1073 | if (ret > 0) { |
| 1074 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
| 1075 | ret = -1; |
| 1076 | } |
| 1077 | return ret; |
| 1078 | } |
| 1079 | if (msg.cmd_type == LTTNG_CONSUMER_STOP) { |
| 1080 | /* |
| 1081 | * Notify the session daemon that the command is completed. |
| 1082 | * |
| 1083 | * On transport layer error, the function call will print an error |
| 1084 | * message so handling the returned code is a bit useless since we |
| 1085 | * return an error code anyway. |
| 1086 | */ |
| 1087 | (void) consumer_send_status_msg(sock, ret_code); |
| 1088 | return -ENOENT; |
| 1089 | } |
| 1090 | |
| 1091 | /* relayd needs RCU read-side lock */ |
| 1092 | rcu_read_lock(); |
| 1093 | |
| 1094 | switch (msg.cmd_type) { |
| 1095 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
| 1096 | { |
| 1097 | /* Session daemon status message are handled in the following call. */ |
| 1098 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
| 1099 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
| 1100 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id); |
| 1101 | goto end_nosignal; |
| 1102 | } |
| 1103 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
| 1104 | { |
| 1105 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
| 1106 | struct consumer_relayd_sock_pair *relayd; |
| 1107 | |
| 1108 | DBG("UST consumer destroying relayd %" PRIu64, index); |
| 1109 | |
| 1110 | /* Get relayd reference if exists. */ |
| 1111 | relayd = consumer_find_relayd(index); |
| 1112 | if (relayd == NULL) { |
| 1113 | DBG("Unable to find relayd %" PRIu64, index); |
| 1114 | ret_code = LTTNG_ERR_NO_CONSUMER; |
| 1115 | } |
| 1116 | |
| 1117 | /* |
| 1118 | * Each relayd socket pair has a refcount of stream attached to it |
| 1119 | * which tells if the relayd is still active or not depending on the |
| 1120 | * refcount value. |
| 1121 | * |
| 1122 | * This will set the destroy flag of the relayd object and destroy it |
| 1123 | * if the refcount reaches zero when called. |
| 1124 | * |
| 1125 | * The destroy can happen either here or when a stream fd hangs up. |
| 1126 | */ |
| 1127 | if (relayd) { |
| 1128 | consumer_flag_relayd_for_destroy(relayd); |
| 1129 | } |
| 1130 | |
| 1131 | goto end_msg_sessiond; |
| 1132 | } |
| 1133 | case LTTNG_CONSUMER_UPDATE_STREAM: |
| 1134 | { |
| 1135 | rcu_read_unlock(); |
| 1136 | return -ENOSYS; |
| 1137 | } |
| 1138 | case LTTNG_CONSUMER_DATA_PENDING: |
| 1139 | { |
| 1140 | int ret, is_data_pending; |
| 1141 | uint64_t id = msg.u.data_pending.session_id; |
| 1142 | |
| 1143 | DBG("UST consumer data pending command for id %" PRIu64, id); |
| 1144 | |
| 1145 | is_data_pending = consumer_data_pending(id); |
| 1146 | |
| 1147 | /* Send back returned value to session daemon */ |
| 1148 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
| 1149 | sizeof(is_data_pending)); |
| 1150 | if (ret < 0) { |
| 1151 | DBG("Error when sending the data pending ret code: %d", ret); |
| 1152 | goto error_fatal; |
| 1153 | } |
| 1154 | |
| 1155 | /* |
| 1156 | * No need to send back a status message since the data pending |
| 1157 | * returned value is the response. |
| 1158 | */ |
| 1159 | break; |
| 1160 | } |
| 1161 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
| 1162 | { |
| 1163 | int ret; |
| 1164 | struct ustctl_consumer_channel_attr attr; |
| 1165 | |
| 1166 | /* Create a plain object and reserve a channel key. */ |
| 1167 | channel = allocate_channel(msg.u.ask_channel.session_id, |
| 1168 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, |
| 1169 | msg.u.ask_channel.uid, msg.u.ask_channel.gid, |
| 1170 | msg.u.ask_channel.relayd_id, msg.u.ask_channel.key, |
| 1171 | (enum lttng_event_output) msg.u.ask_channel.output, |
| 1172 | msg.u.ask_channel.tracefile_size, |
| 1173 | msg.u.ask_channel.tracefile_count, |
| 1174 | msg.u.ask_channel.session_id_per_pid, |
| 1175 | msg.u.ask_channel.monitor); |
| 1176 | if (!channel) { |
| 1177 | goto end_channel_error; |
| 1178 | } |
| 1179 | |
| 1180 | /* Build channel attributes from received message. */ |
| 1181 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; |
| 1182 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; |
| 1183 | attr.overwrite = msg.u.ask_channel.overwrite; |
| 1184 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; |
| 1185 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; |
| 1186 | attr.chan_id = msg.u.ask_channel.chan_id; |
| 1187 | attr.output = msg.u.ask_channel.output; |
| 1188 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
| 1189 | |
| 1190 | /* Translate and save channel type. */ |
| 1191 | switch (msg.u.ask_channel.type) { |
| 1192 | case LTTNG_UST_CHAN_PER_CPU: |
| 1193 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; |
| 1194 | attr.type = LTTNG_UST_CHAN_PER_CPU; |
| 1195 | /* |
| 1196 | * Set refcount to 1 for owner. Below, we will |
| 1197 | * pass ownership to the |
| 1198 | * consumer_thread_channel_poll() thread. |
| 1199 | */ |
| 1200 | channel->refcount = 1; |
| 1201 | break; |
| 1202 | case LTTNG_UST_CHAN_METADATA: |
| 1203 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; |
| 1204 | attr.type = LTTNG_UST_CHAN_METADATA; |
| 1205 | break; |
| 1206 | default: |
| 1207 | assert(0); |
| 1208 | goto error_fatal; |
| 1209 | }; |
| 1210 | |
| 1211 | ret = ask_channel(ctx, sock, channel, &attr); |
| 1212 | if (ret < 0) { |
| 1213 | goto end_channel_error; |
| 1214 | } |
| 1215 | |
| 1216 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
| 1217 | ret = consumer_metadata_cache_allocate(channel); |
| 1218 | if (ret < 0) { |
| 1219 | ERR("Allocating metadata cache"); |
| 1220 | goto end_channel_error; |
| 1221 | } |
| 1222 | consumer_timer_switch_start(channel, attr.switch_timer_interval); |
| 1223 | attr.switch_timer_interval = 0; |
| 1224 | } |
| 1225 | |
| 1226 | /* |
| 1227 | * Add the channel to the internal state AFTER all streams were created |
| 1228 | * and successfully sent to session daemon. This way, all streams must |
| 1229 | * be ready before this channel is visible to the threads. |
| 1230 | * If add_channel succeeds, ownership of the channel is |
| 1231 | * passed to consumer_thread_channel_poll(). |
| 1232 | */ |
| 1233 | ret = add_channel(channel, ctx); |
| 1234 | if (ret < 0) { |
| 1235 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
| 1236 | if (channel->switch_timer_enabled == 1) { |
| 1237 | consumer_timer_switch_stop(channel); |
| 1238 | } |
| 1239 | consumer_metadata_cache_destroy(channel); |
| 1240 | } |
| 1241 | goto end_channel_error; |
| 1242 | } |
| 1243 | |
| 1244 | /* |
| 1245 | * Channel and streams are now created. Inform the session daemon that |
| 1246 | * everything went well and should wait to receive the channel and |
| 1247 | * streams with ustctl API. |
| 1248 | */ |
| 1249 | ret = consumer_send_status_channel(sock, channel); |
| 1250 | if (ret < 0) { |
| 1251 | /* |
| 1252 | * There is probably a problem on the socket. |
| 1253 | */ |
| 1254 | goto error_fatal; |
| 1255 | } |
| 1256 | |
| 1257 | break; |
| 1258 | } |
| 1259 | case LTTNG_CONSUMER_GET_CHANNEL: |
| 1260 | { |
| 1261 | int ret, relayd_err = 0; |
| 1262 | uint64_t key = msg.u.get_channel.key; |
| 1263 | struct lttng_consumer_channel *channel; |
| 1264 | |
| 1265 | channel = consumer_find_channel(key); |
| 1266 | if (!channel) { |
| 1267 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
| 1268 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 1269 | goto end_msg_sessiond; |
| 1270 | } |
| 1271 | |
| 1272 | /* Send everything to sessiond. */ |
| 1273 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); |
| 1274 | if (ret < 0) { |
| 1275 | if (relayd_err) { |
| 1276 | /* |
| 1277 | * We were unable to send to the relayd the stream so avoid |
| 1278 | * sending back a fatal error to the thread since this is OK |
| 1279 | * and the consumer can continue its work. The above call |
| 1280 | * has sent the error status message to the sessiond. |
| 1281 | */ |
| 1282 | goto end_nosignal; |
| 1283 | } |
| 1284 | /* |
| 1285 | * The communicaton was broken hence there is a bad state between |
| 1286 | * the consumer and sessiond so stop everything. |
| 1287 | */ |
| 1288 | goto error_fatal; |
| 1289 | } |
| 1290 | |
| 1291 | /* |
| 1292 | * In no monitor mode, the streams ownership is kept inside the channel |
| 1293 | * so don't send them to the data thread. |
| 1294 | */ |
| 1295 | if (!channel->monitor) { |
| 1296 | goto end_msg_sessiond; |
| 1297 | } |
| 1298 | |
| 1299 | ret = send_streams_to_thread(channel, ctx); |
| 1300 | if (ret < 0) { |
| 1301 | /* |
| 1302 | * If we are unable to send the stream to the thread, there is |
| 1303 | * a big problem so just stop everything. |
| 1304 | */ |
| 1305 | goto error_fatal; |
| 1306 | } |
| 1307 | /* List MUST be empty after or else it could be reused. */ |
| 1308 | assert(cds_list_empty(&channel->streams.head)); |
| 1309 | goto end_msg_sessiond; |
| 1310 | } |
| 1311 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
| 1312 | { |
| 1313 | uint64_t key = msg.u.destroy_channel.key; |
| 1314 | |
| 1315 | /* |
| 1316 | * Only called if streams have not been sent to stream |
| 1317 | * manager thread. However, channel has been sent to |
| 1318 | * channel manager thread. |
| 1319 | */ |
| 1320 | notify_thread_del_channel(ctx, key); |
| 1321 | goto end_msg_sessiond; |
| 1322 | } |
| 1323 | case LTTNG_CONSUMER_CLOSE_METADATA: |
| 1324 | { |
| 1325 | int ret; |
| 1326 | |
| 1327 | ret = close_metadata(msg.u.close_metadata.key); |
| 1328 | if (ret != 0) { |
| 1329 | ret_code = ret; |
| 1330 | } |
| 1331 | |
| 1332 | goto end_msg_sessiond; |
| 1333 | } |
| 1334 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
| 1335 | { |
| 1336 | int ret; |
| 1337 | |
| 1338 | ret = flush_channel(msg.u.flush_channel.key); |
| 1339 | if (ret != 0) { |
| 1340 | ret_code = ret; |
| 1341 | } |
| 1342 | |
| 1343 | goto end_msg_sessiond; |
| 1344 | } |
| 1345 | case LTTNG_CONSUMER_PUSH_METADATA: |
| 1346 | { |
| 1347 | int ret; |
| 1348 | uint64_t len = msg.u.push_metadata.len; |
| 1349 | uint64_t key = msg.u.push_metadata.key; |
| 1350 | uint64_t offset = msg.u.push_metadata.target_offset; |
| 1351 | struct lttng_consumer_channel *channel; |
| 1352 | |
| 1353 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
| 1354 | len); |
| 1355 | |
| 1356 | channel = consumer_find_channel(key); |
| 1357 | if (!channel) { |
| 1358 | ERR("UST consumer push metadata %" PRIu64 " not found", key); |
| 1359 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 1360 | goto end_msg_sessiond; |
| 1361 | } |
| 1362 | |
| 1363 | /* Tell session daemon we are ready to receive the metadata. */ |
| 1364 | ret = consumer_send_status_msg(sock, LTTNG_OK); |
| 1365 | if (ret < 0) { |
| 1366 | /* Somehow, the session daemon is not responding anymore. */ |
| 1367 | goto error_fatal; |
| 1368 | } |
| 1369 | |
| 1370 | /* Wait for more data. */ |
| 1371 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { |
| 1372 | goto error_fatal; |
| 1373 | } |
| 1374 | |
| 1375 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
| 1376 | len, channel, 0); |
| 1377 | if (ret < 0) { |
| 1378 | /* error receiving from sessiond */ |
| 1379 | goto error_fatal; |
| 1380 | } else { |
| 1381 | ret_code = ret; |
| 1382 | goto end_msg_sessiond; |
| 1383 | } |
| 1384 | } |
| 1385 | case LTTNG_CONSUMER_SETUP_METADATA: |
| 1386 | { |
| 1387 | int ret; |
| 1388 | |
| 1389 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); |
| 1390 | if (ret) { |
| 1391 | ret_code = ret; |
| 1392 | } |
| 1393 | goto end_msg_sessiond; |
| 1394 | } |
| 1395 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
| 1396 | { |
| 1397 | if (msg.u.snapshot_channel.metadata) { |
| 1398 | ret = snapshot_metadata(msg.u.snapshot_channel.key, |
| 1399 | msg.u.snapshot_channel.pathname, |
| 1400 | msg.u.snapshot_channel.relayd_id, |
| 1401 | ctx); |
| 1402 | if (ret < 0) { |
| 1403 | ERR("Snapshot metadata failed"); |
| 1404 | ret_code = LTTNG_ERR_UST_META_FAIL; |
| 1405 | } |
| 1406 | } else { |
| 1407 | ret = snapshot_channel(msg.u.snapshot_channel.key, |
| 1408 | msg.u.snapshot_channel.pathname, |
| 1409 | msg.u.snapshot_channel.relayd_id, |
| 1410 | msg.u.snapshot_channel.max_stream_size, |
| 1411 | ctx); |
| 1412 | if (ret < 0) { |
| 1413 | ERR("Snapshot channel failed"); |
| 1414 | ret_code = LTTNG_ERR_UST_CHAN_FAIL; |
| 1415 | } |
| 1416 | } |
| 1417 | |
| 1418 | ret = consumer_send_status_msg(sock, ret_code); |
| 1419 | if (ret < 0) { |
| 1420 | /* Somehow, the session daemon is not responding anymore. */ |
| 1421 | goto end_nosignal; |
| 1422 | } |
| 1423 | break; |
| 1424 | } |
| 1425 | default: |
| 1426 | break; |
| 1427 | } |
| 1428 | |
| 1429 | end_nosignal: |
| 1430 | rcu_read_unlock(); |
| 1431 | |
| 1432 | /* |
| 1433 | * Return 1 to indicate success since the 0 value can be a socket |
| 1434 | * shutdown during the recv() or send() call. |
| 1435 | */ |
| 1436 | return 1; |
| 1437 | |
| 1438 | end_msg_sessiond: |
| 1439 | /* |
| 1440 | * The returned value here is not useful since either way we'll return 1 to |
| 1441 | * the caller because the session daemon socket management is done |
| 1442 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. |
| 1443 | */ |
| 1444 | ret = consumer_send_status_msg(sock, ret_code); |
| 1445 | if (ret < 0) { |
| 1446 | goto error_fatal; |
| 1447 | } |
| 1448 | rcu_read_unlock(); |
| 1449 | return 1; |
| 1450 | end_channel_error: |
| 1451 | if (channel) { |
| 1452 | /* |
| 1453 | * Free channel here since no one has a reference to it. We don't |
| 1454 | * free after that because a stream can store this pointer. |
| 1455 | */ |
| 1456 | destroy_channel(channel); |
| 1457 | } |
| 1458 | /* We have to send a status channel message indicating an error. */ |
| 1459 | ret = consumer_send_status_channel(sock, NULL); |
| 1460 | if (ret < 0) { |
| 1461 | /* Stop everything if session daemon can not be notified. */ |
| 1462 | goto error_fatal; |
| 1463 | } |
| 1464 | rcu_read_unlock(); |
| 1465 | return 1; |
| 1466 | error_fatal: |
| 1467 | rcu_read_unlock(); |
| 1468 | /* This will issue a consumer stop. */ |
| 1469 | return -1; |
| 1470 | } |
| 1471 | |
| 1472 | /* |
| 1473 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be |
| 1474 | * compiled out, we isolate it in this library. |
| 1475 | */ |
| 1476 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, |
| 1477 | unsigned long *off) |
| 1478 | { |
| 1479 | assert(stream); |
| 1480 | assert(stream->ustream); |
| 1481 | |
| 1482 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
| 1483 | } |
| 1484 | |
| 1485 | /* |
| 1486 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be |
| 1487 | * compiled out, we isolate it in this library. |
| 1488 | */ |
| 1489 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) |
| 1490 | { |
| 1491 | assert(stream); |
| 1492 | assert(stream->ustream); |
| 1493 | |
| 1494 | return ustctl_get_mmap_base(stream->ustream); |
| 1495 | } |
| 1496 | |
| 1497 | /* |
| 1498 | * Take a snapshot for a specific fd |
| 1499 | * |
| 1500 | * Returns 0 on success, < 0 on error |
| 1501 | */ |
| 1502 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
| 1503 | { |
| 1504 | assert(stream); |
| 1505 | assert(stream->ustream); |
| 1506 | |
| 1507 | return ustctl_snapshot(stream->ustream); |
| 1508 | } |
| 1509 | |
| 1510 | /* |
| 1511 | * Get the produced position |
| 1512 | * |
| 1513 | * Returns 0 on success, < 0 on error |
| 1514 | */ |
| 1515 | int lttng_ustconsumer_get_produced_snapshot( |
| 1516 | struct lttng_consumer_stream *stream, unsigned long *pos) |
| 1517 | { |
| 1518 | assert(stream); |
| 1519 | assert(stream->ustream); |
| 1520 | assert(pos); |
| 1521 | |
| 1522 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
| 1523 | } |
| 1524 | |
| 1525 | /* |
| 1526 | * Get the consumed position |
| 1527 | * |
| 1528 | * Returns 0 on success, < 0 on error |
| 1529 | */ |
| 1530 | int lttng_ustconsumer_get_consumed_snapshot( |
| 1531 | struct lttng_consumer_stream *stream, unsigned long *pos) |
| 1532 | { |
| 1533 | assert(stream); |
| 1534 | assert(stream->ustream); |
| 1535 | assert(pos); |
| 1536 | |
| 1537 | return ustctl_snapshot_get_consumed(stream->ustream, pos); |
| 1538 | } |
| 1539 | |
| 1540 | /* |
| 1541 | * Called when the stream signal the consumer that it has hang up. |
| 1542 | */ |
| 1543 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) |
| 1544 | { |
| 1545 | assert(stream); |
| 1546 | assert(stream->ustream); |
| 1547 | |
| 1548 | ustctl_flush_buffer(stream->ustream, 0); |
| 1549 | stream->hangup_flush_done = 1; |
| 1550 | } |
| 1551 | |
| 1552 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
| 1553 | { |
| 1554 | assert(chan); |
| 1555 | assert(chan->uchan); |
| 1556 | |
| 1557 | if (chan->switch_timer_enabled == 1) { |
| 1558 | consumer_timer_switch_stop(chan); |
| 1559 | } |
| 1560 | consumer_metadata_cache_destroy(chan); |
| 1561 | ustctl_destroy_channel(chan->uchan); |
| 1562 | } |
| 1563 | |
| 1564 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
| 1565 | { |
| 1566 | assert(stream); |
| 1567 | assert(stream->ustream); |
| 1568 | |
| 1569 | if (stream->chan->switch_timer_enabled == 1) { |
| 1570 | consumer_timer_switch_stop(stream->chan); |
| 1571 | } |
| 1572 | ustctl_destroy_stream(stream->ustream); |
| 1573 | } |
| 1574 | |
| 1575 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
| 1576 | struct lttng_consumer_local_data *ctx) |
| 1577 | { |
| 1578 | unsigned long len, subbuf_size, padding; |
| 1579 | int err; |
| 1580 | long ret = 0; |
| 1581 | char dummy; |
| 1582 | struct ustctl_consumer_stream *ustream; |
| 1583 | |
| 1584 | assert(stream); |
| 1585 | assert(stream->ustream); |
| 1586 | assert(ctx); |
| 1587 | |
| 1588 | DBG("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
| 1589 | stream->name); |
| 1590 | |
| 1591 | /* Ease our life for what's next. */ |
| 1592 | ustream = stream->ustream; |
| 1593 | |
| 1594 | /* We can consume the 1 byte written into the wait_fd by UST */ |
| 1595 | if (stream->monitor && !stream->hangup_flush_done) { |
| 1596 | ssize_t readlen; |
| 1597 | |
| 1598 | do { |
| 1599 | readlen = read(stream->wait_fd, &dummy, 1); |
| 1600 | } while (readlen == -1 && errno == EINTR); |
| 1601 | if (readlen == -1 && errno != EAGAIN && errno != EWOULDBLOCK) { |
| 1602 | ret = readlen; |
| 1603 | goto end; |
| 1604 | } |
| 1605 | } |
| 1606 | |
| 1607 | retry: |
| 1608 | /* Get the next subbuffer */ |
| 1609 | err = ustctl_get_next_subbuf(ustream); |
| 1610 | if (err != 0) { |
| 1611 | /* |
| 1612 | * Populate metadata info if the existing info has |
| 1613 | * already been read. |
| 1614 | */ |
| 1615 | if (stream->metadata_flag) { |
| 1616 | ssize_t write_len; |
| 1617 | |
| 1618 | if (stream->chan->metadata_cache->contiguous |
| 1619 | == stream->ust_metadata_pushed) { |
| 1620 | ret = 0; |
| 1621 | goto end; |
| 1622 | } |
| 1623 | |
| 1624 | write_len = ustctl_write_one_packet_to_channel(stream->chan->uchan, |
| 1625 | &stream->chan->metadata_cache->data[stream->ust_metadata_pushed], |
| 1626 | stream->chan->metadata_cache->contiguous |
| 1627 | - stream->ust_metadata_pushed); |
| 1628 | assert(write_len != 0); |
| 1629 | if (write_len < 0) { |
| 1630 | ERR("Writing one metadata packet"); |
| 1631 | ret = -1; |
| 1632 | goto end; |
| 1633 | } |
| 1634 | stream->ust_metadata_pushed += write_len; |
| 1635 | ustctl_flush_buffer(stream->ustream, 1); |
| 1636 | goto retry; |
| 1637 | } |
| 1638 | |
| 1639 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
| 1640 | /* |
| 1641 | * This is a debug message even for single-threaded consumer, |
| 1642 | * because poll() have more relaxed criterions than get subbuf, |
| 1643 | * so get_subbuf may fail for short race windows where poll() |
| 1644 | * would issue wakeups. |
| 1645 | */ |
| 1646 | DBG("Reserving sub buffer failed (everything is normal, " |
| 1647 | "it is due to concurrency) [ret: %d]", err); |
| 1648 | goto end; |
| 1649 | } |
| 1650 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
| 1651 | /* Get the full padded subbuffer size */ |
| 1652 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
| 1653 | assert(err == 0); |
| 1654 | |
| 1655 | /* Get subbuffer data size (without padding) */ |
| 1656 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
| 1657 | assert(err == 0); |
| 1658 | |
| 1659 | /* Make sure we don't get a subbuffer size bigger than the padded */ |
| 1660 | assert(len >= subbuf_size); |
| 1661 | |
| 1662 | padding = len - subbuf_size; |
| 1663 | /* write the subbuffer to the tracefile */ |
| 1664 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding); |
| 1665 | /* |
| 1666 | * The mmap operation should write subbuf_size amount of data when network |
| 1667 | * streaming or the full padding (len) size when we are _not_ streaming. |
| 1668 | */ |
| 1669 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
| 1670 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { |
| 1671 | /* |
| 1672 | * Display the error but continue processing to try to release the |
| 1673 | * subbuffer. This is a DBG statement since any unexpected kill or |
| 1674 | * signal, the application gets unregistered, relayd gets closed or |
| 1675 | * anything that affects the buffer lifetime will trigger this error. |
| 1676 | * So, for the sake of the user, don't print this error since it can |
| 1677 | * happen and it is OK with the code flow. |
| 1678 | */ |
| 1679 | DBG("Error writing to tracefile " |
| 1680 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
| 1681 | ret, len, subbuf_size); |
| 1682 | } |
| 1683 | err = ustctl_put_next_subbuf(ustream); |
| 1684 | assert(err == 0); |
| 1685 | |
| 1686 | end: |
| 1687 | return ret; |
| 1688 | } |
| 1689 | |
| 1690 | /* |
| 1691 | * Called when a stream is created. |
| 1692 | * |
| 1693 | * Return 0 on success or else a negative value. |
| 1694 | */ |
| 1695 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
| 1696 | { |
| 1697 | int ret; |
| 1698 | |
| 1699 | assert(stream); |
| 1700 | |
| 1701 | /* Don't create anything if this is set for streaming. */ |
| 1702 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { |
| 1703 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
| 1704 | stream->chan->tracefile_size, stream->tracefile_count_current, |
| 1705 | stream->uid, stream->gid); |
| 1706 | if (ret < 0) { |
| 1707 | goto error; |
| 1708 | } |
| 1709 | stream->out_fd = ret; |
| 1710 | stream->tracefile_size_current = 0; |
| 1711 | } |
| 1712 | ret = 0; |
| 1713 | |
| 1714 | error: |
| 1715 | return ret; |
| 1716 | } |
| 1717 | |
| 1718 | /* |
| 1719 | * Check if data is still being extracted from the buffers for a specific |
| 1720 | * stream. Consumer data lock MUST be acquired before calling this function |
| 1721 | * and the stream lock. |
| 1722 | * |
| 1723 | * Return 1 if the traced data are still getting read else 0 meaning that the |
| 1724 | * data is available for trace viewer reading. |
| 1725 | */ |
| 1726 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
| 1727 | { |
| 1728 | int ret; |
| 1729 | |
| 1730 | assert(stream); |
| 1731 | assert(stream->ustream); |
| 1732 | |
| 1733 | DBG("UST consumer checking data pending"); |
| 1734 | |
| 1735 | if (stream->endpoint_status != CONSUMER_ENDPOINT_ACTIVE) { |
| 1736 | ret = 0; |
| 1737 | goto end; |
| 1738 | } |
| 1739 | |
| 1740 | if (stream->chan->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
| 1741 | /* |
| 1742 | * We can simply check whether all contiguously available data |
| 1743 | * has been pushed to the ring buffer, since the push operation |
| 1744 | * is performed within get_next_subbuf(), and because both |
| 1745 | * get_next_subbuf() and put_next_subbuf() are issued atomically |
| 1746 | * thanks to the stream lock within |
| 1747 | * lttng_ustconsumer_read_subbuffer(). This basically means that |
| 1748 | * whetnever ust_metadata_pushed is incremented, the associated |
| 1749 | * metadata has been consumed from the metadata stream. |
| 1750 | */ |
| 1751 | DBG("UST consumer metadata pending check: contiguous %" PRIu64 " vs pushed %" PRIu64, |
| 1752 | stream->chan->metadata_cache->contiguous, |
| 1753 | stream->ust_metadata_pushed); |
| 1754 | if (stream->chan->metadata_cache->contiguous |
| 1755 | != stream->ust_metadata_pushed) { |
| 1756 | ret = 1; /* Data is pending */ |
| 1757 | goto end; |
| 1758 | } |
| 1759 | } else { |
| 1760 | ret = ustctl_get_next_subbuf(stream->ustream); |
| 1761 | if (ret == 0) { |
| 1762 | /* |
| 1763 | * There is still data so let's put back this |
| 1764 | * subbuffer. |
| 1765 | */ |
| 1766 | ret = ustctl_put_subbuf(stream->ustream); |
| 1767 | assert(ret == 0); |
| 1768 | ret = 1; /* Data is pending */ |
| 1769 | goto end; |
| 1770 | } |
| 1771 | } |
| 1772 | |
| 1773 | /* Data is NOT pending so ready to be read. */ |
| 1774 | ret = 0; |
| 1775 | |
| 1776 | end: |
| 1777 | return ret; |
| 1778 | } |
| 1779 | |
| 1780 | /* |
| 1781 | * Close every metadata stream wait fd of the metadata hash table. This |
| 1782 | * function MUST be used very carefully so not to run into a race between the |
| 1783 | * metadata thread handling streams and this function closing their wait fd. |
| 1784 | * |
| 1785 | * For UST, this is used when the session daemon hangs up. Its the metadata |
| 1786 | * producer so calling this is safe because we are assured that no state change |
| 1787 | * can occur in the metadata thread for the streams in the hash table. |
| 1788 | */ |
| 1789 | void lttng_ustconsumer_close_metadata(struct lttng_ht *metadata_ht) |
| 1790 | { |
| 1791 | int ret; |
| 1792 | struct lttng_ht_iter iter; |
| 1793 | struct lttng_consumer_stream *stream; |
| 1794 | |
| 1795 | assert(metadata_ht); |
| 1796 | assert(metadata_ht->ht); |
| 1797 | |
| 1798 | DBG("UST consumer closing all metadata streams"); |
| 1799 | |
| 1800 | rcu_read_lock(); |
| 1801 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, |
| 1802 | node.node) { |
| 1803 | int fd = stream->wait_fd; |
| 1804 | |
| 1805 | /* |
| 1806 | * Whatever happens here we have to continue to try to close every |
| 1807 | * streams. Let's report at least the error on failure. |
| 1808 | */ |
| 1809 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); |
| 1810 | if (ret) { |
| 1811 | ERR("Unable to close metadata stream fd %d ret %d", fd, ret); |
| 1812 | } |
| 1813 | DBG("Metadata wait fd %d closed", fd); |
| 1814 | } |
| 1815 | rcu_read_unlock(); |
| 1816 | } |
| 1817 | |
| 1818 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) |
| 1819 | { |
| 1820 | int ret; |
| 1821 | |
| 1822 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); |
| 1823 | if (ret < 0) { |
| 1824 | ERR("Unable to close wakeup fd"); |
| 1825 | } |
| 1826 | } |
| 1827 | |
| 1828 | /* |
| 1829 | * Please refer to consumer-timer.c before adding any lock within this |
| 1830 | * function or any of its callees. Timers have a very strict locking |
| 1831 | * semantic with respect to teardown. Failure to respect this semantic |
| 1832 | * introduces deadlocks. |
| 1833 | */ |
| 1834 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
| 1835 | struct lttng_consumer_channel *channel, int timer) |
| 1836 | { |
| 1837 | struct lttcomm_metadata_request_msg request; |
| 1838 | struct lttcomm_consumer_msg msg; |
| 1839 | enum lttng_error_code ret_code = LTTNG_OK; |
| 1840 | uint64_t len, key, offset; |
| 1841 | int ret; |
| 1842 | |
| 1843 | assert(channel); |
| 1844 | assert(channel->metadata_cache); |
| 1845 | |
| 1846 | /* send the metadata request to sessiond */ |
| 1847 | switch (consumer_data.type) { |
| 1848 | case LTTNG_CONSUMER64_UST: |
| 1849 | request.bits_per_long = 64; |
| 1850 | break; |
| 1851 | case LTTNG_CONSUMER32_UST: |
| 1852 | request.bits_per_long = 32; |
| 1853 | break; |
| 1854 | default: |
| 1855 | request.bits_per_long = 0; |
| 1856 | break; |
| 1857 | } |
| 1858 | |
| 1859 | request.session_id = channel->session_id; |
| 1860 | request.session_id_per_pid = channel->session_id_per_pid; |
| 1861 | request.uid = channel->uid; |
| 1862 | request.key = channel->key; |
| 1863 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
| 1864 | ", per-pid %" PRIu64, |
| 1865 | channel->session_id, |
| 1866 | channel->session_id_per_pid); |
| 1867 | |
| 1868 | pthread_mutex_lock(&ctx->metadata_socket_lock); |
| 1869 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
| 1870 | sizeof(request)); |
| 1871 | if (ret < 0) { |
| 1872 | ERR("Asking metadata to sessiond"); |
| 1873 | goto end; |
| 1874 | } |
| 1875 | |
| 1876 | /* Receive the metadata from sessiond */ |
| 1877 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, |
| 1878 | sizeof(msg)); |
| 1879 | if (ret != sizeof(msg)) { |
| 1880 | DBG("Consumer received unexpected message size %d (expects %zu)", |
| 1881 | ret, sizeof(msg)); |
| 1882 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
| 1883 | /* |
| 1884 | * The ret value might 0 meaning an orderly shutdown but this is ok |
| 1885 | * since the caller handles this. |
| 1886 | */ |
| 1887 | goto end; |
| 1888 | } |
| 1889 | |
| 1890 | if (msg.cmd_type == LTTNG_ERR_UND) { |
| 1891 | /* No registry found */ |
| 1892 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, |
| 1893 | ret_code); |
| 1894 | ret = 0; |
| 1895 | goto end; |
| 1896 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { |
| 1897 | ERR("Unexpected cmd_type received %d", msg.cmd_type); |
| 1898 | ret = -1; |
| 1899 | goto end; |
| 1900 | } |
| 1901 | |
| 1902 | len = msg.u.push_metadata.len; |
| 1903 | key = msg.u.push_metadata.key; |
| 1904 | offset = msg.u.push_metadata.target_offset; |
| 1905 | |
| 1906 | assert(key == channel->key); |
| 1907 | if (len == 0) { |
| 1908 | DBG("No new metadata to receive for key %" PRIu64, key); |
| 1909 | } |
| 1910 | |
| 1911 | /* Tell session daemon we are ready to receive the metadata. */ |
| 1912 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, |
| 1913 | LTTNG_OK); |
| 1914 | if (ret < 0 || len == 0) { |
| 1915 | /* |
| 1916 | * Somehow, the session daemon is not responding anymore or there is |
| 1917 | * nothing to receive. |
| 1918 | */ |
| 1919 | goto end; |
| 1920 | } |
| 1921 | |
| 1922 | ret_code = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
| 1923 | key, offset, len, channel, timer); |
| 1924 | if (ret_code >= 0) { |
| 1925 | /* |
| 1926 | * Only send the status msg if the sessiond is alive meaning a positive |
| 1927 | * ret code. |
| 1928 | */ |
| 1929 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret_code); |
| 1930 | } |
| 1931 | ret = 0; |
| 1932 | |
| 1933 | end: |
| 1934 | pthread_mutex_unlock(&ctx->metadata_socket_lock); |
| 1935 | return ret; |
| 1936 | } |