| 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 | stream_pipe = ctx->consumer_metadata_pipe; |
| 198 | } else { |
| 199 | stream_pipe = ctx->consumer_data_pipe; |
| 200 | } |
| 201 | |
| 202 | ret = lttng_pipe_write(stream_pipe, &stream, sizeof(stream)); |
| 203 | if (ret < 0) { |
| 204 | ERR("Consumer write %s stream to pipe %d", |
| 205 | stream->metadata_flag ? "metadata" : "data", |
| 206 | lttng_pipe_get_writefd(stream_pipe)); |
| 207 | } |
| 208 | |
| 209 | return ret; |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * Search for a relayd object related to the stream. If found, send the stream |
| 214 | * to the relayd. |
| 215 | * |
| 216 | * On success, returns 0 else a negative value. |
| 217 | */ |
| 218 | static int send_stream_to_relayd(struct lttng_consumer_stream *stream) |
| 219 | { |
| 220 | int ret = 0; |
| 221 | struct consumer_relayd_sock_pair *relayd; |
| 222 | |
| 223 | assert(stream); |
| 224 | |
| 225 | relayd = consumer_find_relayd(stream->net_seq_idx); |
| 226 | if (relayd != NULL) { |
| 227 | pthread_mutex_lock(&relayd->ctrl_sock_mutex); |
| 228 | /* Add stream on the relayd */ |
| 229 | ret = relayd_add_stream(&relayd->control_sock, stream->name, |
| 230 | stream->chan->pathname, &stream->relayd_stream_id, |
| 231 | stream->chan->tracefile_size, |
| 232 | stream->chan->tracefile_count); |
| 233 | pthread_mutex_unlock(&relayd->ctrl_sock_mutex); |
| 234 | if (ret < 0) { |
| 235 | goto error; |
| 236 | } |
| 237 | } else if (stream->net_seq_idx != (uint64_t) -1ULL) { |
| 238 | ERR("Network sequence index %" PRIu64 " unknown. Not adding stream.", |
| 239 | stream->net_seq_idx); |
| 240 | ret = -1; |
| 241 | goto error; |
| 242 | } |
| 243 | |
| 244 | error: |
| 245 | return ret; |
| 246 | } |
| 247 | |
| 248 | /* |
| 249 | * Create streams for the given channel using liblttng-ust-ctl. |
| 250 | * |
| 251 | * Return 0 on success else a negative value. |
| 252 | */ |
| 253 | static int create_ust_streams(struct lttng_consumer_channel *channel, |
| 254 | struct lttng_consumer_local_data *ctx) |
| 255 | { |
| 256 | int ret, cpu = 0; |
| 257 | struct ustctl_consumer_stream *ustream; |
| 258 | struct lttng_consumer_stream *stream; |
| 259 | |
| 260 | assert(channel); |
| 261 | assert(ctx); |
| 262 | |
| 263 | /* |
| 264 | * While a stream is available from ustctl. When NULL is returned, we've |
| 265 | * reached the end of the possible stream for the channel. |
| 266 | */ |
| 267 | while ((ustream = ustctl_create_stream(channel->uchan, cpu))) { |
| 268 | int wait_fd; |
| 269 | |
| 270 | wait_fd = ustctl_stream_get_wait_fd(ustream); |
| 271 | |
| 272 | /* Allocate consumer stream object. */ |
| 273 | stream = allocate_stream(cpu, wait_fd, channel, ctx, &ret); |
| 274 | if (!stream) { |
| 275 | goto error_alloc; |
| 276 | } |
| 277 | stream->ustream = ustream; |
| 278 | /* |
| 279 | * Store it so we can save multiple function calls afterwards since |
| 280 | * this value is used heavily in the stream threads. This is UST |
| 281 | * specific so this is why it's done after allocation. |
| 282 | */ |
| 283 | stream->wait_fd = wait_fd; |
| 284 | |
| 285 | /* |
| 286 | * Increment channel refcount since the channel reference has now been |
| 287 | * assigned in the allocation process above. |
| 288 | */ |
| 289 | if (stream->chan->monitor) { |
| 290 | uatomic_inc(&stream->chan->refcount); |
| 291 | } |
| 292 | |
| 293 | /* |
| 294 | * Order is important this is why a list is used. On error, the caller |
| 295 | * should clean this list. |
| 296 | */ |
| 297 | cds_list_add_tail(&stream->send_node, &channel->streams.head); |
| 298 | |
| 299 | ret = ustctl_get_max_subbuf_size(stream->ustream, |
| 300 | &stream->max_sb_size); |
| 301 | if (ret < 0) { |
| 302 | ERR("ustctl_get_max_subbuf_size failed for stream %s", |
| 303 | stream->name); |
| 304 | goto error; |
| 305 | } |
| 306 | |
| 307 | /* Do actions once stream has been received. */ |
| 308 | if (ctx->on_recv_stream) { |
| 309 | ret = ctx->on_recv_stream(stream); |
| 310 | if (ret < 0) { |
| 311 | goto error; |
| 312 | } |
| 313 | } |
| 314 | |
| 315 | DBG("UST consumer add stream %s (key: %" PRIu64 ") with relayd id %" PRIu64, |
| 316 | stream->name, stream->key, stream->relayd_stream_id); |
| 317 | |
| 318 | /* Set next CPU stream. */ |
| 319 | channel->streams.count = ++cpu; |
| 320 | |
| 321 | /* Keep stream reference when creating metadata. */ |
| 322 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA) { |
| 323 | channel->metadata_stream = stream; |
| 324 | } |
| 325 | } |
| 326 | |
| 327 | return 0; |
| 328 | |
| 329 | error: |
| 330 | error_alloc: |
| 331 | return ret; |
| 332 | } |
| 333 | |
| 334 | /* |
| 335 | * Create an UST channel with the given attributes and send it to the session |
| 336 | * daemon using the ust ctl API. |
| 337 | * |
| 338 | * Return 0 on success or else a negative value. |
| 339 | */ |
| 340 | static int create_ust_channel(struct ustctl_consumer_channel_attr *attr, |
| 341 | struct ustctl_consumer_channel **chanp) |
| 342 | { |
| 343 | int ret; |
| 344 | struct ustctl_consumer_channel *channel; |
| 345 | |
| 346 | assert(attr); |
| 347 | assert(chanp); |
| 348 | |
| 349 | DBG3("Creating channel to ustctl with attr: [overwrite: %d, " |
| 350 | "subbuf_size: %" PRIu64 ", num_subbuf: %" PRIu64 ", " |
| 351 | "switch_timer_interval: %u, read_timer_interval: %u, " |
| 352 | "output: %d, type: %d", attr->overwrite, attr->subbuf_size, |
| 353 | attr->num_subbuf, attr->switch_timer_interval, |
| 354 | attr->read_timer_interval, attr->output, attr->type); |
| 355 | |
| 356 | channel = ustctl_create_channel(attr); |
| 357 | if (!channel) { |
| 358 | ret = -1; |
| 359 | goto error_create; |
| 360 | } |
| 361 | |
| 362 | *chanp = channel; |
| 363 | |
| 364 | return 0; |
| 365 | |
| 366 | error_create: |
| 367 | return ret; |
| 368 | } |
| 369 | |
| 370 | /* |
| 371 | * Send a single given stream to the session daemon using the sock. |
| 372 | * |
| 373 | * Return 0 on success else a negative value. |
| 374 | */ |
| 375 | static int send_sessiond_stream(int sock, struct lttng_consumer_stream *stream) |
| 376 | { |
| 377 | int ret; |
| 378 | |
| 379 | assert(stream); |
| 380 | assert(sock >= 0); |
| 381 | |
| 382 | DBG2("UST consumer sending stream %" PRIu64 " to sessiond", stream->key); |
| 383 | |
| 384 | /* Send stream to session daemon. */ |
| 385 | ret = ustctl_send_stream_to_sessiond(sock, stream->ustream); |
| 386 | if (ret < 0) { |
| 387 | goto error; |
| 388 | } |
| 389 | |
| 390 | error: |
| 391 | return ret; |
| 392 | } |
| 393 | |
| 394 | /* |
| 395 | * Send channel to sessiond. |
| 396 | * |
| 397 | * Return 0 on success or else a negative value. |
| 398 | */ |
| 399 | static int send_sessiond_channel(int sock, |
| 400 | struct lttng_consumer_channel *channel, |
| 401 | struct lttng_consumer_local_data *ctx, int *relayd_error) |
| 402 | { |
| 403 | int ret, ret_code = LTTNG_OK; |
| 404 | struct lttng_consumer_stream *stream; |
| 405 | |
| 406 | assert(channel); |
| 407 | assert(ctx); |
| 408 | assert(sock >= 0); |
| 409 | |
| 410 | DBG("UST consumer sending channel %s to sessiond", channel->name); |
| 411 | |
| 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 = send_stream_to_relayd(stream); |
| 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 | /* Inform sessiond that we are about to send channel and streams. */ |
| 428 | ret = consumer_send_status_msg(sock, ret_code); |
| 429 | if (ret < 0 || ret_code != LTTNG_OK) { |
| 430 | /* |
| 431 | * Either the session daemon is not responding or the relayd died so we |
| 432 | * stop now. |
| 433 | */ |
| 434 | goto error; |
| 435 | } |
| 436 | |
| 437 | /* Send channel to sessiond. */ |
| 438 | ret = ustctl_send_channel_to_sessiond(sock, channel->uchan); |
| 439 | if (ret < 0) { |
| 440 | goto error; |
| 441 | } |
| 442 | |
| 443 | ret = ustctl_channel_close_wakeup_fd(channel->uchan); |
| 444 | if (ret < 0) { |
| 445 | goto error; |
| 446 | } |
| 447 | |
| 448 | /* The channel was sent successfully to the sessiond at this point. */ |
| 449 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
| 450 | /* Send stream to session daemon. */ |
| 451 | ret = send_sessiond_stream(sock, stream); |
| 452 | if (ret < 0) { |
| 453 | goto error; |
| 454 | } |
| 455 | } |
| 456 | |
| 457 | /* Tell sessiond there is no more stream. */ |
| 458 | ret = ustctl_send_stream_to_sessiond(sock, NULL); |
| 459 | if (ret < 0) { |
| 460 | goto error; |
| 461 | } |
| 462 | |
| 463 | DBG("UST consumer NULL stream sent to sessiond"); |
| 464 | |
| 465 | return 0; |
| 466 | |
| 467 | error: |
| 468 | if (ret_code != LTTNG_OK) { |
| 469 | ret = -1; |
| 470 | } |
| 471 | return ret; |
| 472 | } |
| 473 | |
| 474 | /* |
| 475 | * Creates a channel and streams and add the channel it to the channel internal |
| 476 | * state. The created stream must ONLY be sent once the GET_CHANNEL command is |
| 477 | * received. |
| 478 | * |
| 479 | * Return 0 on success or else, a negative value is returned and the channel |
| 480 | * MUST be destroyed by consumer_del_channel(). |
| 481 | */ |
| 482 | static int ask_channel(struct lttng_consumer_local_data *ctx, int sock, |
| 483 | struct lttng_consumer_channel *channel, |
| 484 | struct ustctl_consumer_channel_attr *attr) |
| 485 | { |
| 486 | int ret; |
| 487 | |
| 488 | assert(ctx); |
| 489 | assert(channel); |
| 490 | assert(attr); |
| 491 | |
| 492 | /* |
| 493 | * This value is still used by the kernel consumer since for the kernel, |
| 494 | * the stream ownership is not IN the consumer so we need to have the |
| 495 | * number of left stream that needs to be initialized so we can know when |
| 496 | * to delete the channel (see consumer.c). |
| 497 | * |
| 498 | * As for the user space tracer now, the consumer creates and sends the |
| 499 | * stream to the session daemon which only sends them to the application |
| 500 | * once every stream of a channel is received making this value useless |
| 501 | * because we they will be added to the poll thread before the application |
| 502 | * receives them. This ensures that a stream can not hang up during |
| 503 | * initilization of a channel. |
| 504 | */ |
| 505 | channel->nb_init_stream_left = 0; |
| 506 | |
| 507 | /* The reply msg status is handled in the following call. */ |
| 508 | ret = create_ust_channel(attr, &channel->uchan); |
| 509 | if (ret < 0) { |
| 510 | goto end; |
| 511 | } |
| 512 | |
| 513 | channel->wait_fd = ustctl_channel_get_wait_fd(channel->uchan); |
| 514 | |
| 515 | /* |
| 516 | * For the snapshots (no monitor), we create the metadata streams |
| 517 | * on demand, not during the channel creation. |
| 518 | */ |
| 519 | if (channel->type == CONSUMER_CHANNEL_TYPE_METADATA && !channel->monitor) { |
| 520 | ret = 0; |
| 521 | goto end; |
| 522 | } |
| 523 | |
| 524 | /* Open all streams for this channel. */ |
| 525 | ret = create_ust_streams(channel, ctx); |
| 526 | if (ret < 0) { |
| 527 | goto end; |
| 528 | } |
| 529 | |
| 530 | end: |
| 531 | return ret; |
| 532 | } |
| 533 | |
| 534 | /* |
| 535 | * Send all stream of a channel to the right thread handling it. |
| 536 | * |
| 537 | * On error, return a negative value else 0 on success. |
| 538 | */ |
| 539 | static int send_streams_to_thread(struct lttng_consumer_channel *channel, |
| 540 | struct lttng_consumer_local_data *ctx) |
| 541 | { |
| 542 | int ret = 0; |
| 543 | struct lttng_consumer_stream *stream, *stmp; |
| 544 | |
| 545 | assert(channel); |
| 546 | assert(ctx); |
| 547 | |
| 548 | /* Send streams to the corresponding thread. */ |
| 549 | cds_list_for_each_entry_safe(stream, stmp, &channel->streams.head, |
| 550 | send_node) { |
| 551 | /* Sending the stream to the thread. */ |
| 552 | ret = send_stream_to_thread(stream, ctx); |
| 553 | if (ret < 0) { |
| 554 | /* |
| 555 | * If we are unable to send the stream to the thread, there is |
| 556 | * a big problem so just stop everything. |
| 557 | */ |
| 558 | goto error; |
| 559 | } |
| 560 | |
| 561 | /* Remove node from the channel stream list. */ |
| 562 | cds_list_del(&stream->send_node); |
| 563 | |
| 564 | /* |
| 565 | * From this point on, the stream's ownership has been moved away from |
| 566 | * the channel and becomes globally visible. |
| 567 | */ |
| 568 | stream->globally_visible = 1; |
| 569 | } |
| 570 | |
| 571 | error: |
| 572 | return ret; |
| 573 | } |
| 574 | |
| 575 | /* |
| 576 | * Write metadata to the given channel using ustctl to convert the string to |
| 577 | * the ringbuffer. |
| 578 | * Called only from consumer_metadata_cache_write. |
| 579 | * The metadata cache lock MUST be acquired to write in the cache. |
| 580 | * |
| 581 | * Return 0 on success else a negative value. |
| 582 | */ |
| 583 | int lttng_ustconsumer_push_metadata(struct lttng_consumer_channel *metadata, |
| 584 | const char *metadata_str, uint64_t target_offset, uint64_t len) |
| 585 | { |
| 586 | int ret; |
| 587 | |
| 588 | assert(metadata); |
| 589 | assert(metadata_str); |
| 590 | |
| 591 | DBG("UST consumer writing metadata to channel %s", metadata->name); |
| 592 | |
| 593 | if (!metadata->metadata_stream) { |
| 594 | ret = 0; |
| 595 | goto error; |
| 596 | } |
| 597 | |
| 598 | assert(target_offset <= metadata->metadata_cache->max_offset); |
| 599 | ret = ustctl_write_metadata_to_channel(metadata->uchan, |
| 600 | metadata_str + target_offset, len); |
| 601 | if (ret < 0) { |
| 602 | ERR("ustctl write metadata fail with ret %d, len %" PRIu64, ret, len); |
| 603 | goto error; |
| 604 | } |
| 605 | |
| 606 | ustctl_flush_buffer(metadata->metadata_stream->ustream, 1); |
| 607 | |
| 608 | error: |
| 609 | return ret; |
| 610 | } |
| 611 | |
| 612 | /* |
| 613 | * Flush channel's streams using the given key to retrieve the channel. |
| 614 | * |
| 615 | * Return 0 on success else an LTTng error code. |
| 616 | */ |
| 617 | static int flush_channel(uint64_t chan_key) |
| 618 | { |
| 619 | int ret = 0; |
| 620 | struct lttng_consumer_channel *channel; |
| 621 | struct lttng_consumer_stream *stream; |
| 622 | struct lttng_ht *ht; |
| 623 | struct lttng_ht_iter iter; |
| 624 | |
| 625 | DBG("UST consumer flush channel key %" PRIu64, chan_key); |
| 626 | |
| 627 | rcu_read_lock(); |
| 628 | channel = consumer_find_channel(chan_key); |
| 629 | if (!channel) { |
| 630 | ERR("UST consumer flush channel %" PRIu64 " not found", chan_key); |
| 631 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 632 | goto error; |
| 633 | } |
| 634 | |
| 635 | ht = consumer_data.stream_per_chan_id_ht; |
| 636 | |
| 637 | /* For each stream of the channel id, flush it. */ |
| 638 | cds_lfht_for_each_entry_duplicate(ht->ht, |
| 639 | ht->hash_fct(&channel->key, lttng_ht_seed), ht->match_fct, |
| 640 | &channel->key, &iter.iter, stream, node_channel_id.node) { |
| 641 | ustctl_flush_buffer(stream->ustream, 1); |
| 642 | } |
| 643 | error: |
| 644 | rcu_read_unlock(); |
| 645 | return ret; |
| 646 | } |
| 647 | |
| 648 | /* |
| 649 | * Close metadata stream wakeup_fd using the given key to retrieve the channel. |
| 650 | * RCU read side lock MUST be acquired before calling this function. |
| 651 | * |
| 652 | * Return 0 on success else an LTTng error code. |
| 653 | */ |
| 654 | static int close_metadata(uint64_t chan_key) |
| 655 | { |
| 656 | int ret = 0; |
| 657 | struct lttng_consumer_channel *channel; |
| 658 | |
| 659 | DBG("UST consumer close metadata key %" PRIu64, chan_key); |
| 660 | |
| 661 | channel = consumer_find_channel(chan_key); |
| 662 | if (!channel) { |
| 663 | /* |
| 664 | * This is possible if the metadata thread has issue a delete because |
| 665 | * the endpoint point of the stream hung up. There is no way the |
| 666 | * session daemon can know about it thus use a DBG instead of an actual |
| 667 | * error. |
| 668 | */ |
| 669 | DBG("UST consumer close metadata %" PRIu64 " not found", chan_key); |
| 670 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 671 | goto error; |
| 672 | } |
| 673 | |
| 674 | pthread_mutex_lock(&consumer_data.lock); |
| 675 | |
| 676 | if (cds_lfht_is_node_deleted(&channel->node.node)) { |
| 677 | goto error_unlock; |
| 678 | } |
| 679 | |
| 680 | if (channel->switch_timer_enabled == 1) { |
| 681 | DBG("Deleting timer on metadata channel"); |
| 682 | consumer_timer_switch_stop(channel); |
| 683 | } |
| 684 | |
| 685 | if (channel->metadata_stream) { |
| 686 | ret = ustctl_stream_close_wakeup_fd(channel->metadata_stream->ustream); |
| 687 | if (ret < 0) { |
| 688 | ERR("UST consumer unable to close fd of metadata (ret: %d)", ret); |
| 689 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; |
| 690 | goto error_unlock; |
| 691 | } |
| 692 | } |
| 693 | |
| 694 | error_unlock: |
| 695 | pthread_mutex_unlock(&consumer_data.lock); |
| 696 | error: |
| 697 | return ret; |
| 698 | } |
| 699 | |
| 700 | /* |
| 701 | * RCU read side lock MUST be acquired before calling this function. |
| 702 | * |
| 703 | * Return 0 on success else an LTTng error code. |
| 704 | */ |
| 705 | static int setup_metadata(struct lttng_consumer_local_data *ctx, uint64_t key) |
| 706 | { |
| 707 | int ret; |
| 708 | struct lttng_consumer_channel *metadata; |
| 709 | |
| 710 | DBG("UST consumer setup metadata key %" PRIu64, key); |
| 711 | |
| 712 | metadata = consumer_find_channel(key); |
| 713 | if (!metadata) { |
| 714 | ERR("UST consumer push metadata %" PRIu64 " not found", key); |
| 715 | ret = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 716 | goto end; |
| 717 | } |
| 718 | |
| 719 | /* |
| 720 | * In no monitor mode, the metadata channel has no stream(s) so skip the |
| 721 | * ownership transfer to the metadata thread. |
| 722 | */ |
| 723 | if (!metadata->monitor) { |
| 724 | DBG("Metadata channel in no monitor"); |
| 725 | ret = 0; |
| 726 | goto end; |
| 727 | } |
| 728 | |
| 729 | /* |
| 730 | * Send metadata stream to relayd if one available. Availability is |
| 731 | * known if the stream is still in the list of the channel. |
| 732 | */ |
| 733 | if (cds_list_empty(&metadata->streams.head)) { |
| 734 | ERR("Metadata channel key %" PRIu64 ", no stream available.", key); |
| 735 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; |
| 736 | goto error_no_stream; |
| 737 | } |
| 738 | |
| 739 | /* Send metadata stream to relayd if needed. */ |
| 740 | ret = send_stream_to_relayd(metadata->metadata_stream); |
| 741 | if (ret < 0) { |
| 742 | ret = LTTCOMM_CONSUMERD_ERROR_METADATA; |
| 743 | goto error; |
| 744 | } |
| 745 | |
| 746 | ret = send_streams_to_thread(metadata, ctx); |
| 747 | if (ret < 0) { |
| 748 | /* |
| 749 | * If we are unable to send the stream to the thread, there is |
| 750 | * a big problem so just stop everything. |
| 751 | */ |
| 752 | ret = LTTCOMM_CONSUMERD_FATAL; |
| 753 | goto error; |
| 754 | } |
| 755 | /* List MUST be empty after or else it could be reused. */ |
| 756 | assert(cds_list_empty(&metadata->streams.head)); |
| 757 | |
| 758 | ret = 0; |
| 759 | goto end; |
| 760 | |
| 761 | error: |
| 762 | /* |
| 763 | * Delete metadata channel on error. At this point, the metadata stream can |
| 764 | * NOT be monitored by the metadata thread thus having the guarantee that |
| 765 | * the stream is still in the local stream list of the channel. This call |
| 766 | * will make sure to clean that list. |
| 767 | */ |
| 768 | cds_list_del(&metadata->metadata_stream->send_node); |
| 769 | consumer_stream_destroy(metadata->metadata_stream, NULL); |
| 770 | error_no_stream: |
| 771 | end: |
| 772 | return ret; |
| 773 | } |
| 774 | |
| 775 | /* |
| 776 | * Snapshot the whole metadata. |
| 777 | * |
| 778 | * Returns 0 on success, < 0 on error |
| 779 | */ |
| 780 | static int snapshot_metadata(uint64_t key, char *path, uint64_t relayd_id, |
| 781 | struct lttng_consumer_local_data *ctx) |
| 782 | { |
| 783 | int ret = 0; |
| 784 | ssize_t write_len; |
| 785 | uint64_t total_len = 0; |
| 786 | struct lttng_consumer_channel *metadata_channel; |
| 787 | struct lttng_consumer_stream *metadata_stream; |
| 788 | |
| 789 | assert(path); |
| 790 | assert(ctx); |
| 791 | |
| 792 | DBG("UST consumer snapshot metadata with key %" PRIu64 " at path %s", |
| 793 | key, path); |
| 794 | |
| 795 | rcu_read_lock(); |
| 796 | |
| 797 | metadata_channel = consumer_find_channel(key); |
| 798 | if (!metadata_channel) { |
| 799 | ERR("UST snapshot metadata channel not found for key %lu", key); |
| 800 | ret = -1; |
| 801 | goto error; |
| 802 | } |
| 803 | assert(!metadata_channel->monitor); |
| 804 | |
| 805 | /* |
| 806 | * Ask the sessiond if we have new metadata waiting and update the |
| 807 | * consumer metadata cache. |
| 808 | */ |
| 809 | ret = lttng_ustconsumer_request_metadata(ctx, metadata_channel); |
| 810 | if (ret < 0) { |
| 811 | goto error; |
| 812 | } |
| 813 | |
| 814 | /* |
| 815 | * The metadata stream is NOT created in no monitor mode when the channel |
| 816 | * is created on a sessiond ask channel command. |
| 817 | */ |
| 818 | ret = create_ust_streams(metadata_channel, ctx); |
| 819 | if (ret < 0) { |
| 820 | goto error; |
| 821 | } |
| 822 | |
| 823 | metadata_stream = metadata_channel->metadata_stream; |
| 824 | assert(metadata_stream); |
| 825 | |
| 826 | if (relayd_id != (uint64_t) -1ULL) { |
| 827 | metadata_stream->net_seq_idx = relayd_id; |
| 828 | ret = consumer_send_relayd_stream(metadata_stream, path); |
| 829 | if (ret < 0) { |
| 830 | goto error_stream; |
| 831 | } |
| 832 | } else { |
| 833 | ret = utils_create_stream_file(path, metadata_stream->name, |
| 834 | metadata_stream->chan->tracefile_size, |
| 835 | metadata_stream->tracefile_count_current, |
| 836 | metadata_stream->uid, metadata_stream->gid); |
| 837 | if (ret < 0) { |
| 838 | goto error_stream; |
| 839 | } |
| 840 | metadata_stream->out_fd = ret; |
| 841 | metadata_stream->tracefile_size_current = 0; |
| 842 | } |
| 843 | |
| 844 | pthread_mutex_lock(&metadata_channel->metadata_cache->lock); |
| 845 | while (total_len < metadata_channel->metadata_cache->total_bytes_written) { |
| 846 | /* |
| 847 | * Write at most one packet of metadata into the channel |
| 848 | * to avoid blocking here. |
| 849 | */ |
| 850 | write_len = ustctl_write_one_packet_to_channel(metadata_channel->uchan, |
| 851 | metadata_channel->metadata_cache->data, |
| 852 | metadata_channel->metadata_cache->total_bytes_written); |
| 853 | if (write_len < 0) { |
| 854 | ERR("UST consumer snapshot writing metadata packet"); |
| 855 | ret = -1; |
| 856 | goto error_unlock; |
| 857 | } |
| 858 | total_len += write_len; |
| 859 | |
| 860 | DBG("Written %" PRIu64 " bytes to metadata (left: %" PRIu64 ")", |
| 861 | write_len, |
| 862 | metadata_channel->metadata_cache->total_bytes_written - write_len); |
| 863 | ustctl_flush_buffer(metadata_stream->ustream, 1); |
| 864 | ret = lttng_consumer_read_subbuffer(metadata_stream, ctx); |
| 865 | if (ret < 0) { |
| 866 | goto error_unlock; |
| 867 | } |
| 868 | } |
| 869 | |
| 870 | error_unlock: |
| 871 | pthread_mutex_unlock(&metadata_channel->metadata_cache->lock); |
| 872 | |
| 873 | error_stream: |
| 874 | /* |
| 875 | * Clean up the stream completly because the next snapshot will use a new |
| 876 | * metadata stream. |
| 877 | */ |
| 878 | cds_list_del(&metadata_stream->send_node); |
| 879 | consumer_stream_destroy(metadata_stream, NULL); |
| 880 | metadata_channel->metadata_stream = NULL; |
| 881 | |
| 882 | error: |
| 883 | rcu_read_unlock(); |
| 884 | return ret; |
| 885 | } |
| 886 | |
| 887 | /* |
| 888 | * Take a snapshot of all the stream of a channel. |
| 889 | * |
| 890 | * Returns 0 on success, < 0 on error |
| 891 | */ |
| 892 | static int snapshot_channel(uint64_t key, char *path, uint64_t relayd_id, |
| 893 | struct lttng_consumer_local_data *ctx) |
| 894 | { |
| 895 | int ret; |
| 896 | unsigned use_relayd = 0; |
| 897 | unsigned long consumed_pos, produced_pos; |
| 898 | struct lttng_consumer_channel *channel; |
| 899 | struct lttng_consumer_stream *stream; |
| 900 | |
| 901 | assert(path); |
| 902 | assert(ctx); |
| 903 | |
| 904 | rcu_read_lock(); |
| 905 | |
| 906 | if (relayd_id != (uint64_t) -1ULL) { |
| 907 | use_relayd = 1; |
| 908 | } |
| 909 | |
| 910 | channel = consumer_find_channel(key); |
| 911 | if (!channel) { |
| 912 | ERR("UST snapshot channel not found for key %lu", key); |
| 913 | ret = -1; |
| 914 | goto error; |
| 915 | } |
| 916 | assert(!channel->monitor); |
| 917 | DBG("UST consumer snapshot channel %lu", key); |
| 918 | |
| 919 | cds_list_for_each_entry(stream, &channel->streams.head, send_node) { |
| 920 | /* Lock stream because we are about to change its state. */ |
| 921 | pthread_mutex_lock(&stream->lock); |
| 922 | stream->net_seq_idx = relayd_id; |
| 923 | |
| 924 | if (use_relayd) { |
| 925 | ret = consumer_send_relayd_stream(stream, path); |
| 926 | if (ret < 0) { |
| 927 | goto error_unlock; |
| 928 | } |
| 929 | } else { |
| 930 | ret = utils_create_stream_file(path, stream->name, |
| 931 | stream->chan->tracefile_size, |
| 932 | stream->tracefile_count_current, |
| 933 | stream->uid, stream->gid); |
| 934 | if (ret < 0) { |
| 935 | goto error_unlock; |
| 936 | } |
| 937 | stream->out_fd = ret; |
| 938 | stream->tracefile_size_current = 0; |
| 939 | |
| 940 | DBG("UST consumer snapshot stream %s/%s (%" PRIu64 ")", path, |
| 941 | stream->name, stream->key); |
| 942 | } |
| 943 | |
| 944 | ustctl_flush_buffer(stream->ustream, 1); |
| 945 | |
| 946 | ret = lttng_ustconsumer_take_snapshot(stream); |
| 947 | if (ret < 0) { |
| 948 | ERR("Taking UST snapshot"); |
| 949 | goto error_unlock; |
| 950 | } |
| 951 | |
| 952 | ret = lttng_ustconsumer_get_produced_snapshot(stream, &produced_pos); |
| 953 | if (ret < 0) { |
| 954 | ERR("Produced UST snapshot position"); |
| 955 | goto error_unlock; |
| 956 | } |
| 957 | |
| 958 | ret = lttng_ustconsumer_get_consumed_snapshot(stream, &consumed_pos); |
| 959 | if (ret < 0) { |
| 960 | ERR("Consumerd UST snapshot position"); |
| 961 | goto error_unlock; |
| 962 | } |
| 963 | |
| 964 | while (consumed_pos < produced_pos) { |
| 965 | ssize_t read_len; |
| 966 | unsigned long len, padded_len; |
| 967 | |
| 968 | DBG("UST consumer taking snapshot at pos %lu", consumed_pos); |
| 969 | |
| 970 | ret = ustctl_get_subbuf(stream->ustream, &consumed_pos); |
| 971 | if (ret < 0) { |
| 972 | if (ret != -EAGAIN) { |
| 973 | PERROR("ustctl_get_subbuf snapshot"); |
| 974 | goto error_close_stream; |
| 975 | } |
| 976 | DBG("UST consumer get subbuf failed. Skipping it."); |
| 977 | consumed_pos += stream->max_sb_size; |
| 978 | continue; |
| 979 | } |
| 980 | |
| 981 | ret = ustctl_get_subbuf_size(stream->ustream, &len); |
| 982 | if (ret < 0) { |
| 983 | ERR("Snapshot ustctl_get_subbuf_size"); |
| 984 | goto error_put_subbuf; |
| 985 | } |
| 986 | |
| 987 | ret = ustctl_get_padded_subbuf_size(stream->ustream, &padded_len); |
| 988 | if (ret < 0) { |
| 989 | ERR("Snapshot ustctl_get_padded_subbuf_size"); |
| 990 | goto error_put_subbuf; |
| 991 | } |
| 992 | |
| 993 | read_len = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, len, |
| 994 | padded_len - len); |
| 995 | if (use_relayd) { |
| 996 | if (read_len != len) { |
| 997 | ret = -1; |
| 998 | goto error_put_subbuf; |
| 999 | } |
| 1000 | } else { |
| 1001 | if (read_len != padded_len) { |
| 1002 | ret = -1; |
| 1003 | goto error_put_subbuf; |
| 1004 | } |
| 1005 | } |
| 1006 | |
| 1007 | ret = ustctl_put_subbuf(stream->ustream); |
| 1008 | if (ret < 0) { |
| 1009 | ERR("Snapshot ustctl_put_subbuf"); |
| 1010 | goto error_close_stream; |
| 1011 | } |
| 1012 | consumed_pos += stream->max_sb_size; |
| 1013 | } |
| 1014 | |
| 1015 | /* Simply close the stream so we can use it on the next snapshot. */ |
| 1016 | consumer_stream_close(stream); |
| 1017 | pthread_mutex_unlock(&stream->lock); |
| 1018 | } |
| 1019 | |
| 1020 | rcu_read_unlock(); |
| 1021 | return 0; |
| 1022 | |
| 1023 | error_put_subbuf: |
| 1024 | if (ustctl_put_subbuf(stream->ustream) < 0) { |
| 1025 | ERR("Snapshot ustctl_put_subbuf"); |
| 1026 | } |
| 1027 | error_close_stream: |
| 1028 | consumer_stream_close(stream); |
| 1029 | error_unlock: |
| 1030 | pthread_mutex_unlock(&stream->lock); |
| 1031 | error: |
| 1032 | rcu_read_unlock(); |
| 1033 | return ret; |
| 1034 | } |
| 1035 | |
| 1036 | /* |
| 1037 | * Receive the metadata updates from the sessiond. |
| 1038 | */ |
| 1039 | int lttng_ustconsumer_recv_metadata(int sock, uint64_t key, uint64_t offset, |
| 1040 | uint64_t len, struct lttng_consumer_channel *channel) |
| 1041 | { |
| 1042 | int ret, ret_code = LTTNG_OK; |
| 1043 | char *metadata_str; |
| 1044 | |
| 1045 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, len); |
| 1046 | |
| 1047 | metadata_str = zmalloc(len * sizeof(char)); |
| 1048 | if (!metadata_str) { |
| 1049 | PERROR("zmalloc metadata string"); |
| 1050 | ret_code = LTTCOMM_CONSUMERD_ENOMEM; |
| 1051 | goto end; |
| 1052 | } |
| 1053 | |
| 1054 | /* Receive metadata string. */ |
| 1055 | ret = lttcomm_recv_unix_sock(sock, metadata_str, len); |
| 1056 | if (ret < 0) { |
| 1057 | /* Session daemon is dead so return gracefully. */ |
| 1058 | ret_code = ret; |
| 1059 | goto end_free; |
| 1060 | } |
| 1061 | |
| 1062 | /* |
| 1063 | * XXX: The consumer data lock is acquired before calling metadata cache |
| 1064 | * write which calls push metadata that MUST be protected by the consumer |
| 1065 | * lock in order to be able to check the validity of the metadata stream of |
| 1066 | * the channel. |
| 1067 | * |
| 1068 | * Note that this will be subject to change to better fine grained locking |
| 1069 | * and ultimately try to get rid of this global consumer data lock. |
| 1070 | */ |
| 1071 | pthread_mutex_lock(&consumer_data.lock); |
| 1072 | |
| 1073 | pthread_mutex_lock(&channel->metadata_cache->lock); |
| 1074 | ret = consumer_metadata_cache_write(channel, offset, len, metadata_str); |
| 1075 | if (ret < 0) { |
| 1076 | /* Unable to handle metadata. Notify session daemon. */ |
| 1077 | ret_code = LTTCOMM_CONSUMERD_ERROR_METADATA; |
| 1078 | /* |
| 1079 | * Skip metadata flush on write error since the offset and len might |
| 1080 | * not have been updated which could create an infinite loop below when |
| 1081 | * waiting for the metadata cache to be flushed. |
| 1082 | */ |
| 1083 | pthread_mutex_unlock(&channel->metadata_cache->lock); |
| 1084 | pthread_mutex_unlock(&consumer_data.lock); |
| 1085 | goto end_free; |
| 1086 | } |
| 1087 | pthread_mutex_unlock(&channel->metadata_cache->lock); |
| 1088 | pthread_mutex_unlock(&consumer_data.lock); |
| 1089 | |
| 1090 | while (consumer_metadata_cache_flushed(channel, offset + len)) { |
| 1091 | DBG("Waiting for metadata to be flushed"); |
| 1092 | usleep(DEFAULT_METADATA_AVAILABILITY_WAIT_TIME); |
| 1093 | } |
| 1094 | |
| 1095 | end_free: |
| 1096 | free(metadata_str); |
| 1097 | end: |
| 1098 | return ret_code; |
| 1099 | } |
| 1100 | |
| 1101 | /* |
| 1102 | * Receive command from session daemon and process it. |
| 1103 | * |
| 1104 | * Return 1 on success else a negative value or 0. |
| 1105 | */ |
| 1106 | int lttng_ustconsumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
| 1107 | int sock, struct pollfd *consumer_sockpoll) |
| 1108 | { |
| 1109 | ssize_t ret; |
| 1110 | enum lttng_error_code ret_code = LTTNG_OK; |
| 1111 | struct lttcomm_consumer_msg msg; |
| 1112 | struct lttng_consumer_channel *channel = NULL; |
| 1113 | |
| 1114 | ret = lttcomm_recv_unix_sock(sock, &msg, sizeof(msg)); |
| 1115 | if (ret != sizeof(msg)) { |
| 1116 | DBG("Consumer received unexpected message size %zd (expects %zu)", |
| 1117 | ret, sizeof(msg)); |
| 1118 | /* |
| 1119 | * The ret value might 0 meaning an orderly shutdown but this is ok |
| 1120 | * since the caller handles this. |
| 1121 | */ |
| 1122 | if (ret > 0) { |
| 1123 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
| 1124 | ret = -1; |
| 1125 | } |
| 1126 | return ret; |
| 1127 | } |
| 1128 | if (msg.cmd_type == LTTNG_CONSUMER_STOP) { |
| 1129 | /* |
| 1130 | * Notify the session daemon that the command is completed. |
| 1131 | * |
| 1132 | * On transport layer error, the function call will print an error |
| 1133 | * message so handling the returned code is a bit useless since we |
| 1134 | * return an error code anyway. |
| 1135 | */ |
| 1136 | (void) consumer_send_status_msg(sock, ret_code); |
| 1137 | return -ENOENT; |
| 1138 | } |
| 1139 | |
| 1140 | /* relayd needs RCU read-side lock */ |
| 1141 | rcu_read_lock(); |
| 1142 | |
| 1143 | switch (msg.cmd_type) { |
| 1144 | case LTTNG_CONSUMER_ADD_RELAYD_SOCKET: |
| 1145 | { |
| 1146 | /* Session daemon status message are handled in the following call. */ |
| 1147 | ret = consumer_add_relayd_socket(msg.u.relayd_sock.net_index, |
| 1148 | msg.u.relayd_sock.type, ctx, sock, consumer_sockpoll, |
| 1149 | &msg.u.relayd_sock.sock, msg.u.relayd_sock.session_id); |
| 1150 | goto end_nosignal; |
| 1151 | } |
| 1152 | case LTTNG_CONSUMER_DESTROY_RELAYD: |
| 1153 | { |
| 1154 | uint64_t index = msg.u.destroy_relayd.net_seq_idx; |
| 1155 | struct consumer_relayd_sock_pair *relayd; |
| 1156 | |
| 1157 | DBG("UST consumer destroying relayd %" PRIu64, index); |
| 1158 | |
| 1159 | /* Get relayd reference if exists. */ |
| 1160 | relayd = consumer_find_relayd(index); |
| 1161 | if (relayd == NULL) { |
| 1162 | DBG("Unable to find relayd %" PRIu64, index); |
| 1163 | ret_code = LTTNG_ERR_NO_CONSUMER; |
| 1164 | } |
| 1165 | |
| 1166 | /* |
| 1167 | * Each relayd socket pair has a refcount of stream attached to it |
| 1168 | * which tells if the relayd is still active or not depending on the |
| 1169 | * refcount value. |
| 1170 | * |
| 1171 | * This will set the destroy flag of the relayd object and destroy it |
| 1172 | * if the refcount reaches zero when called. |
| 1173 | * |
| 1174 | * The destroy can happen either here or when a stream fd hangs up. |
| 1175 | */ |
| 1176 | if (relayd) { |
| 1177 | consumer_flag_relayd_for_destroy(relayd); |
| 1178 | } |
| 1179 | |
| 1180 | goto end_msg_sessiond; |
| 1181 | } |
| 1182 | case LTTNG_CONSUMER_UPDATE_STREAM: |
| 1183 | { |
| 1184 | rcu_read_unlock(); |
| 1185 | return -ENOSYS; |
| 1186 | } |
| 1187 | case LTTNG_CONSUMER_DATA_PENDING: |
| 1188 | { |
| 1189 | int ret, is_data_pending; |
| 1190 | uint64_t id = msg.u.data_pending.session_id; |
| 1191 | |
| 1192 | DBG("UST consumer data pending command for id %" PRIu64, id); |
| 1193 | |
| 1194 | is_data_pending = consumer_data_pending(id); |
| 1195 | |
| 1196 | /* Send back returned value to session daemon */ |
| 1197 | ret = lttcomm_send_unix_sock(sock, &is_data_pending, |
| 1198 | sizeof(is_data_pending)); |
| 1199 | if (ret < 0) { |
| 1200 | DBG("Error when sending the data pending ret code: %d", ret); |
| 1201 | goto error_fatal; |
| 1202 | } |
| 1203 | |
| 1204 | /* |
| 1205 | * No need to send back a status message since the data pending |
| 1206 | * returned value is the response. |
| 1207 | */ |
| 1208 | break; |
| 1209 | } |
| 1210 | case LTTNG_CONSUMER_ASK_CHANNEL_CREATION: |
| 1211 | { |
| 1212 | int ret; |
| 1213 | struct ustctl_consumer_channel_attr attr; |
| 1214 | |
| 1215 | /* Create a plain object and reserve a channel key. */ |
| 1216 | channel = allocate_channel(msg.u.ask_channel.session_id, |
| 1217 | msg.u.ask_channel.pathname, msg.u.ask_channel.name, |
| 1218 | msg.u.ask_channel.uid, msg.u.ask_channel.gid, |
| 1219 | msg.u.ask_channel.relayd_id, msg.u.ask_channel.key, |
| 1220 | (enum lttng_event_output) msg.u.ask_channel.output, |
| 1221 | msg.u.ask_channel.tracefile_size, |
| 1222 | msg.u.ask_channel.tracefile_count, |
| 1223 | msg.u.ask_channel.session_id_per_pid, |
| 1224 | msg.u.ask_channel.monitor); |
| 1225 | if (!channel) { |
| 1226 | goto end_channel_error; |
| 1227 | } |
| 1228 | |
| 1229 | /* Build channel attributes from received message. */ |
| 1230 | attr.subbuf_size = msg.u.ask_channel.subbuf_size; |
| 1231 | attr.num_subbuf = msg.u.ask_channel.num_subbuf; |
| 1232 | attr.overwrite = msg.u.ask_channel.overwrite; |
| 1233 | attr.switch_timer_interval = msg.u.ask_channel.switch_timer_interval; |
| 1234 | attr.read_timer_interval = msg.u.ask_channel.read_timer_interval; |
| 1235 | attr.chan_id = msg.u.ask_channel.chan_id; |
| 1236 | attr.output = msg.u.ask_channel.output; |
| 1237 | memcpy(attr.uuid, msg.u.ask_channel.uuid, sizeof(attr.uuid)); |
| 1238 | |
| 1239 | /* Translate and save channel type. */ |
| 1240 | switch (msg.u.ask_channel.type) { |
| 1241 | case LTTNG_UST_CHAN_PER_CPU: |
| 1242 | channel->type = CONSUMER_CHANNEL_TYPE_DATA; |
| 1243 | attr.type = LTTNG_UST_CHAN_PER_CPU; |
| 1244 | /* |
| 1245 | * Set refcount to 1 for owner. Below, we will |
| 1246 | * pass ownership to the |
| 1247 | * consumer_thread_channel_poll() thread. |
| 1248 | */ |
| 1249 | channel->refcount = 1; |
| 1250 | break; |
| 1251 | case LTTNG_UST_CHAN_METADATA: |
| 1252 | channel->type = CONSUMER_CHANNEL_TYPE_METADATA; |
| 1253 | attr.type = LTTNG_UST_CHAN_METADATA; |
| 1254 | break; |
| 1255 | default: |
| 1256 | assert(0); |
| 1257 | goto error_fatal; |
| 1258 | }; |
| 1259 | |
| 1260 | ret = ask_channel(ctx, sock, channel, &attr); |
| 1261 | if (ret < 0) { |
| 1262 | goto end_channel_error; |
| 1263 | } |
| 1264 | |
| 1265 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
| 1266 | ret = consumer_metadata_cache_allocate(channel); |
| 1267 | if (ret < 0) { |
| 1268 | ERR("Allocating metadata cache"); |
| 1269 | goto end_channel_error; |
| 1270 | } |
| 1271 | consumer_timer_switch_start(channel, attr.switch_timer_interval); |
| 1272 | attr.switch_timer_interval = 0; |
| 1273 | } |
| 1274 | |
| 1275 | /* |
| 1276 | * Add the channel to the internal state AFTER all streams were created |
| 1277 | * and successfully sent to session daemon. This way, all streams must |
| 1278 | * be ready before this channel is visible to the threads. |
| 1279 | * If add_channel succeeds, ownership of the channel is |
| 1280 | * passed to consumer_thread_channel_poll(). |
| 1281 | */ |
| 1282 | ret = add_channel(channel, ctx); |
| 1283 | if (ret < 0) { |
| 1284 | if (msg.u.ask_channel.type == LTTNG_UST_CHAN_METADATA) { |
| 1285 | if (channel->switch_timer_enabled == 1) { |
| 1286 | consumer_timer_switch_stop(channel); |
| 1287 | } |
| 1288 | consumer_metadata_cache_destroy(channel); |
| 1289 | } |
| 1290 | goto end_channel_error; |
| 1291 | } |
| 1292 | |
| 1293 | /* |
| 1294 | * Channel and streams are now created. Inform the session daemon that |
| 1295 | * everything went well and should wait to receive the channel and |
| 1296 | * streams with ustctl API. |
| 1297 | */ |
| 1298 | ret = consumer_send_status_channel(sock, channel); |
| 1299 | if (ret < 0) { |
| 1300 | /* |
| 1301 | * There is probably a problem on the socket. |
| 1302 | */ |
| 1303 | goto error_fatal; |
| 1304 | } |
| 1305 | |
| 1306 | break; |
| 1307 | } |
| 1308 | case LTTNG_CONSUMER_GET_CHANNEL: |
| 1309 | { |
| 1310 | int ret, relayd_err = 0; |
| 1311 | uint64_t key = msg.u.get_channel.key; |
| 1312 | struct lttng_consumer_channel *channel; |
| 1313 | |
| 1314 | channel = consumer_find_channel(key); |
| 1315 | if (!channel) { |
| 1316 | ERR("UST consumer get channel key %" PRIu64 " not found", key); |
| 1317 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 1318 | goto end_msg_sessiond; |
| 1319 | } |
| 1320 | |
| 1321 | /* Send everything to sessiond. */ |
| 1322 | ret = send_sessiond_channel(sock, channel, ctx, &relayd_err); |
| 1323 | if (ret < 0) { |
| 1324 | if (relayd_err) { |
| 1325 | /* |
| 1326 | * We were unable to send to the relayd the stream so avoid |
| 1327 | * sending back a fatal error to the thread since this is OK |
| 1328 | * and the consumer can continue its work. The above call |
| 1329 | * has sent the error status message to the sessiond. |
| 1330 | */ |
| 1331 | goto end_nosignal; |
| 1332 | } |
| 1333 | /* |
| 1334 | * The communicaton was broken hence there is a bad state between |
| 1335 | * the consumer and sessiond so stop everything. |
| 1336 | */ |
| 1337 | goto error_fatal; |
| 1338 | } |
| 1339 | |
| 1340 | /* |
| 1341 | * In no monitor mode, the streams ownership is kept inside the channel |
| 1342 | * so don't send them to the data thread. |
| 1343 | */ |
| 1344 | if (!channel->monitor) { |
| 1345 | goto end_msg_sessiond; |
| 1346 | } |
| 1347 | |
| 1348 | ret = send_streams_to_thread(channel, ctx); |
| 1349 | if (ret < 0) { |
| 1350 | /* |
| 1351 | * If we are unable to send the stream to the thread, there is |
| 1352 | * a big problem so just stop everything. |
| 1353 | */ |
| 1354 | goto error_fatal; |
| 1355 | } |
| 1356 | /* List MUST be empty after or else it could be reused. */ |
| 1357 | assert(cds_list_empty(&channel->streams.head)); |
| 1358 | goto end_msg_sessiond; |
| 1359 | } |
| 1360 | case LTTNG_CONSUMER_DESTROY_CHANNEL: |
| 1361 | { |
| 1362 | uint64_t key = msg.u.destroy_channel.key; |
| 1363 | |
| 1364 | /* |
| 1365 | * Only called if streams have not been sent to stream |
| 1366 | * manager thread. However, channel has been sent to |
| 1367 | * channel manager thread. |
| 1368 | */ |
| 1369 | notify_thread_del_channel(ctx, key); |
| 1370 | goto end_msg_sessiond; |
| 1371 | } |
| 1372 | case LTTNG_CONSUMER_CLOSE_METADATA: |
| 1373 | { |
| 1374 | int ret; |
| 1375 | |
| 1376 | ret = close_metadata(msg.u.close_metadata.key); |
| 1377 | if (ret != 0) { |
| 1378 | ret_code = ret; |
| 1379 | } |
| 1380 | |
| 1381 | goto end_msg_sessiond; |
| 1382 | } |
| 1383 | case LTTNG_CONSUMER_FLUSH_CHANNEL: |
| 1384 | { |
| 1385 | int ret; |
| 1386 | |
| 1387 | ret = flush_channel(msg.u.flush_channel.key); |
| 1388 | if (ret != 0) { |
| 1389 | ret_code = ret; |
| 1390 | } |
| 1391 | |
| 1392 | goto end_msg_sessiond; |
| 1393 | } |
| 1394 | case LTTNG_CONSUMER_PUSH_METADATA: |
| 1395 | { |
| 1396 | int ret; |
| 1397 | uint64_t len = msg.u.push_metadata.len; |
| 1398 | uint64_t key = msg.u.push_metadata.key; |
| 1399 | uint64_t offset = msg.u.push_metadata.target_offset; |
| 1400 | struct lttng_consumer_channel *channel; |
| 1401 | |
| 1402 | DBG("UST consumer push metadata key %" PRIu64 " of len %" PRIu64, key, |
| 1403 | len); |
| 1404 | |
| 1405 | channel = consumer_find_channel(key); |
| 1406 | if (!channel) { |
| 1407 | ERR("UST consumer push metadata %" PRIu64 " not found", key); |
| 1408 | ret_code = LTTNG_ERR_UST_CHAN_NOT_FOUND; |
| 1409 | goto end_msg_sessiond; |
| 1410 | } |
| 1411 | |
| 1412 | /* Tell session daemon we are ready to receive the metadata. */ |
| 1413 | ret = consumer_send_status_msg(sock, LTTNG_OK); |
| 1414 | if (ret < 0) { |
| 1415 | /* Somehow, the session daemon is not responding anymore. */ |
| 1416 | goto error_fatal; |
| 1417 | } |
| 1418 | |
| 1419 | /* Wait for more data. */ |
| 1420 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { |
| 1421 | goto error_fatal; |
| 1422 | } |
| 1423 | |
| 1424 | ret = lttng_ustconsumer_recv_metadata(sock, key, offset, |
| 1425 | len, channel); |
| 1426 | if (ret < 0) { |
| 1427 | /* error receiving from sessiond */ |
| 1428 | goto error_fatal; |
| 1429 | } else { |
| 1430 | ret_code = ret; |
| 1431 | goto end_msg_sessiond; |
| 1432 | } |
| 1433 | } |
| 1434 | case LTTNG_CONSUMER_SETUP_METADATA: |
| 1435 | { |
| 1436 | int ret; |
| 1437 | |
| 1438 | ret = setup_metadata(ctx, msg.u.setup_metadata.key); |
| 1439 | if (ret) { |
| 1440 | ret_code = ret; |
| 1441 | } |
| 1442 | goto end_msg_sessiond; |
| 1443 | } |
| 1444 | case LTTNG_CONSUMER_SNAPSHOT_CHANNEL: |
| 1445 | { |
| 1446 | if (msg.u.snapshot_channel.metadata) { |
| 1447 | ret = snapshot_metadata(msg.u.snapshot_channel.key, |
| 1448 | msg.u.snapshot_channel.pathname, |
| 1449 | msg.u.snapshot_channel.relayd_id, |
| 1450 | ctx); |
| 1451 | if (ret < 0) { |
| 1452 | ERR("Snapshot metadata failed"); |
| 1453 | ret_code = LTTNG_ERR_UST_META_FAIL; |
| 1454 | } |
| 1455 | } else { |
| 1456 | ret = snapshot_channel(msg.u.snapshot_channel.key, |
| 1457 | msg.u.snapshot_channel.pathname, |
| 1458 | msg.u.snapshot_channel.relayd_id, |
| 1459 | ctx); |
| 1460 | if (ret < 0) { |
| 1461 | ERR("Snapshot channel failed"); |
| 1462 | ret_code = LTTNG_ERR_UST_CHAN_FAIL; |
| 1463 | } |
| 1464 | } |
| 1465 | |
| 1466 | ret = consumer_send_status_msg(sock, ret_code); |
| 1467 | if (ret < 0) { |
| 1468 | /* Somehow, the session daemon is not responding anymore. */ |
| 1469 | goto end_nosignal; |
| 1470 | } |
| 1471 | break; |
| 1472 | } |
| 1473 | default: |
| 1474 | break; |
| 1475 | } |
| 1476 | |
| 1477 | end_nosignal: |
| 1478 | rcu_read_unlock(); |
| 1479 | |
| 1480 | /* |
| 1481 | * Return 1 to indicate success since the 0 value can be a socket |
| 1482 | * shutdown during the recv() or send() call. |
| 1483 | */ |
| 1484 | return 1; |
| 1485 | |
| 1486 | end_msg_sessiond: |
| 1487 | /* |
| 1488 | * The returned value here is not useful since either way we'll return 1 to |
| 1489 | * the caller because the session daemon socket management is done |
| 1490 | * elsewhere. Returning a negative code or 0 will shutdown the consumer. |
| 1491 | */ |
| 1492 | ret = consumer_send_status_msg(sock, ret_code); |
| 1493 | if (ret < 0) { |
| 1494 | goto error_fatal; |
| 1495 | } |
| 1496 | rcu_read_unlock(); |
| 1497 | return 1; |
| 1498 | end_channel_error: |
| 1499 | if (channel) { |
| 1500 | /* |
| 1501 | * Free channel here since no one has a reference to it. We don't |
| 1502 | * free after that because a stream can store this pointer. |
| 1503 | */ |
| 1504 | destroy_channel(channel); |
| 1505 | } |
| 1506 | /* We have to send a status channel message indicating an error. */ |
| 1507 | ret = consumer_send_status_channel(sock, NULL); |
| 1508 | if (ret < 0) { |
| 1509 | /* Stop everything if session daemon can not be notified. */ |
| 1510 | goto error_fatal; |
| 1511 | } |
| 1512 | rcu_read_unlock(); |
| 1513 | return 1; |
| 1514 | error_fatal: |
| 1515 | rcu_read_unlock(); |
| 1516 | /* This will issue a consumer stop. */ |
| 1517 | return -1; |
| 1518 | } |
| 1519 | |
| 1520 | /* |
| 1521 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be |
| 1522 | * compiled out, we isolate it in this library. |
| 1523 | */ |
| 1524 | int lttng_ustctl_get_mmap_read_offset(struct lttng_consumer_stream *stream, |
| 1525 | unsigned long *off) |
| 1526 | { |
| 1527 | assert(stream); |
| 1528 | assert(stream->ustream); |
| 1529 | |
| 1530 | return ustctl_get_mmap_read_offset(stream->ustream, off); |
| 1531 | } |
| 1532 | |
| 1533 | /* |
| 1534 | * Wrapper over the mmap() read offset from ust-ctl library. Since this can be |
| 1535 | * compiled out, we isolate it in this library. |
| 1536 | */ |
| 1537 | void *lttng_ustctl_get_mmap_base(struct lttng_consumer_stream *stream) |
| 1538 | { |
| 1539 | assert(stream); |
| 1540 | assert(stream->ustream); |
| 1541 | |
| 1542 | return ustctl_get_mmap_base(stream->ustream); |
| 1543 | } |
| 1544 | |
| 1545 | /* |
| 1546 | * Take a snapshot for a specific fd |
| 1547 | * |
| 1548 | * Returns 0 on success, < 0 on error |
| 1549 | */ |
| 1550 | int lttng_ustconsumer_take_snapshot(struct lttng_consumer_stream *stream) |
| 1551 | { |
| 1552 | assert(stream); |
| 1553 | assert(stream->ustream); |
| 1554 | |
| 1555 | return ustctl_snapshot(stream->ustream); |
| 1556 | } |
| 1557 | |
| 1558 | /* |
| 1559 | * Get the produced position |
| 1560 | * |
| 1561 | * Returns 0 on success, < 0 on error |
| 1562 | */ |
| 1563 | int lttng_ustconsumer_get_produced_snapshot( |
| 1564 | struct lttng_consumer_stream *stream, unsigned long *pos) |
| 1565 | { |
| 1566 | assert(stream); |
| 1567 | assert(stream->ustream); |
| 1568 | assert(pos); |
| 1569 | |
| 1570 | return ustctl_snapshot_get_produced(stream->ustream, pos); |
| 1571 | } |
| 1572 | |
| 1573 | /* |
| 1574 | * Get the consumed position |
| 1575 | * |
| 1576 | * Returns 0 on success, < 0 on error |
| 1577 | */ |
| 1578 | int lttng_ustconsumer_get_consumed_snapshot( |
| 1579 | struct lttng_consumer_stream *stream, unsigned long *pos) |
| 1580 | { |
| 1581 | assert(stream); |
| 1582 | assert(stream->ustream); |
| 1583 | assert(pos); |
| 1584 | |
| 1585 | return ustctl_snapshot_get_consumed(stream->ustream, pos); |
| 1586 | } |
| 1587 | |
| 1588 | /* |
| 1589 | * Called when the stream signal the consumer that it has hang up. |
| 1590 | */ |
| 1591 | void lttng_ustconsumer_on_stream_hangup(struct lttng_consumer_stream *stream) |
| 1592 | { |
| 1593 | assert(stream); |
| 1594 | assert(stream->ustream); |
| 1595 | |
| 1596 | ustctl_flush_buffer(stream->ustream, 0); |
| 1597 | stream->hangup_flush_done = 1; |
| 1598 | } |
| 1599 | |
| 1600 | void lttng_ustconsumer_del_channel(struct lttng_consumer_channel *chan) |
| 1601 | { |
| 1602 | assert(chan); |
| 1603 | assert(chan->uchan); |
| 1604 | |
| 1605 | if (chan->switch_timer_enabled == 1) { |
| 1606 | consumer_timer_switch_stop(chan); |
| 1607 | } |
| 1608 | consumer_metadata_cache_destroy(chan); |
| 1609 | ustctl_destroy_channel(chan->uchan); |
| 1610 | } |
| 1611 | |
| 1612 | void lttng_ustconsumer_del_stream(struct lttng_consumer_stream *stream) |
| 1613 | { |
| 1614 | assert(stream); |
| 1615 | assert(stream->ustream); |
| 1616 | |
| 1617 | if (stream->chan->switch_timer_enabled == 1) { |
| 1618 | consumer_timer_switch_stop(stream->chan); |
| 1619 | } |
| 1620 | ustctl_destroy_stream(stream->ustream); |
| 1621 | } |
| 1622 | |
| 1623 | int lttng_ustconsumer_read_subbuffer(struct lttng_consumer_stream *stream, |
| 1624 | struct lttng_consumer_local_data *ctx) |
| 1625 | { |
| 1626 | unsigned long len, subbuf_size, padding; |
| 1627 | int err; |
| 1628 | long ret = 0; |
| 1629 | char dummy; |
| 1630 | struct ustctl_consumer_stream *ustream; |
| 1631 | |
| 1632 | assert(stream); |
| 1633 | assert(stream->ustream); |
| 1634 | assert(ctx); |
| 1635 | |
| 1636 | DBG2("In UST read_subbuffer (wait_fd: %d, name: %s)", stream->wait_fd, |
| 1637 | stream->name); |
| 1638 | |
| 1639 | /* Ease our life for what's next. */ |
| 1640 | ustream = stream->ustream; |
| 1641 | |
| 1642 | /* We can consume the 1 byte written into the wait_fd by UST */ |
| 1643 | if (!stream->hangup_flush_done) { |
| 1644 | ssize_t readlen; |
| 1645 | |
| 1646 | do { |
| 1647 | readlen = read(stream->wait_fd, &dummy, 1); |
| 1648 | } while (readlen == -1 && errno == EINTR); |
| 1649 | if (readlen == -1) { |
| 1650 | ret = readlen; |
| 1651 | goto end; |
| 1652 | } |
| 1653 | } |
| 1654 | |
| 1655 | /* Get the next subbuffer */ |
| 1656 | err = ustctl_get_next_subbuf(ustream); |
| 1657 | if (err != 0) { |
| 1658 | ret = err; /* ustctl_get_next_subbuf returns negative, caller expect positive. */ |
| 1659 | /* |
| 1660 | * This is a debug message even for single-threaded consumer, |
| 1661 | * because poll() have more relaxed criterions than get subbuf, |
| 1662 | * so get_subbuf may fail for short race windows where poll() |
| 1663 | * would issue wakeups. |
| 1664 | */ |
| 1665 | DBG("Reserving sub buffer failed (everything is normal, " |
| 1666 | "it is due to concurrency) [ret: %d]", err); |
| 1667 | goto end; |
| 1668 | } |
| 1669 | assert(stream->chan->output == CONSUMER_CHANNEL_MMAP); |
| 1670 | /* Get the full padded subbuffer size */ |
| 1671 | err = ustctl_get_padded_subbuf_size(ustream, &len); |
| 1672 | assert(err == 0); |
| 1673 | |
| 1674 | /* Get subbuffer data size (without padding) */ |
| 1675 | err = ustctl_get_subbuf_size(ustream, &subbuf_size); |
| 1676 | assert(err == 0); |
| 1677 | |
| 1678 | /* Make sure we don't get a subbuffer size bigger than the padded */ |
| 1679 | assert(len >= subbuf_size); |
| 1680 | |
| 1681 | padding = len - subbuf_size; |
| 1682 | /* write the subbuffer to the tracefile */ |
| 1683 | ret = lttng_consumer_on_read_subbuffer_mmap(ctx, stream, subbuf_size, padding); |
| 1684 | /* |
| 1685 | * The mmap operation should write subbuf_size amount of data when network |
| 1686 | * streaming or the full padding (len) size when we are _not_ streaming. |
| 1687 | */ |
| 1688 | if ((ret != subbuf_size && stream->net_seq_idx != (uint64_t) -1ULL) || |
| 1689 | (ret != len && stream->net_seq_idx == (uint64_t) -1ULL)) { |
| 1690 | /* |
| 1691 | * Display the error but continue processing to try to release the |
| 1692 | * subbuffer. This is a DBG statement since any unexpected kill or |
| 1693 | * signal, the application gets unregistered, relayd gets closed or |
| 1694 | * anything that affects the buffer lifetime will trigger this error. |
| 1695 | * So, for the sake of the user, don't print this error since it can |
| 1696 | * happen and it is OK with the code flow. |
| 1697 | */ |
| 1698 | DBG("Error writing to tracefile " |
| 1699 | "(ret: %ld != len: %lu != subbuf_size: %lu)", |
| 1700 | ret, len, subbuf_size); |
| 1701 | } |
| 1702 | err = ustctl_put_next_subbuf(ustream); |
| 1703 | assert(err == 0); |
| 1704 | |
| 1705 | end: |
| 1706 | return ret; |
| 1707 | } |
| 1708 | |
| 1709 | /* |
| 1710 | * Called when a stream is created. |
| 1711 | * |
| 1712 | * Return 0 on success or else a negative value. |
| 1713 | */ |
| 1714 | int lttng_ustconsumer_on_recv_stream(struct lttng_consumer_stream *stream) |
| 1715 | { |
| 1716 | int ret; |
| 1717 | |
| 1718 | assert(stream); |
| 1719 | |
| 1720 | /* Don't create anything if this is set for streaming. */ |
| 1721 | if (stream->net_seq_idx == (uint64_t) -1ULL && stream->chan->monitor) { |
| 1722 | ret = utils_create_stream_file(stream->chan->pathname, stream->name, |
| 1723 | stream->chan->tracefile_size, stream->tracefile_count_current, |
| 1724 | stream->uid, stream->gid); |
| 1725 | if (ret < 0) { |
| 1726 | goto error; |
| 1727 | } |
| 1728 | stream->out_fd = ret; |
| 1729 | stream->tracefile_size_current = 0; |
| 1730 | } |
| 1731 | ret = 0; |
| 1732 | |
| 1733 | error: |
| 1734 | return ret; |
| 1735 | } |
| 1736 | |
| 1737 | /* |
| 1738 | * Check if data is still being extracted from the buffers for a specific |
| 1739 | * stream. Consumer data lock MUST be acquired before calling this function |
| 1740 | * and the stream lock. |
| 1741 | * |
| 1742 | * Return 1 if the traced data are still getting read else 0 meaning that the |
| 1743 | * data is available for trace viewer reading. |
| 1744 | */ |
| 1745 | int lttng_ustconsumer_data_pending(struct lttng_consumer_stream *stream) |
| 1746 | { |
| 1747 | int ret; |
| 1748 | |
| 1749 | assert(stream); |
| 1750 | assert(stream->ustream); |
| 1751 | |
| 1752 | DBG("UST consumer checking data pending"); |
| 1753 | |
| 1754 | ret = ustctl_get_next_subbuf(stream->ustream); |
| 1755 | if (ret == 0) { |
| 1756 | /* There is still data so let's put back this subbuffer. */ |
| 1757 | ret = ustctl_put_subbuf(stream->ustream); |
| 1758 | assert(ret == 0); |
| 1759 | ret = 1; /* Data is pending */ |
| 1760 | goto end; |
| 1761 | } |
| 1762 | |
| 1763 | /* Data is NOT pending so ready to be read. */ |
| 1764 | ret = 0; |
| 1765 | |
| 1766 | end: |
| 1767 | return ret; |
| 1768 | } |
| 1769 | |
| 1770 | /* |
| 1771 | * Close every metadata stream wait fd of the metadata hash table. This |
| 1772 | * function MUST be used very carefully so not to run into a race between the |
| 1773 | * metadata thread handling streams and this function closing their wait fd. |
| 1774 | * |
| 1775 | * For UST, this is used when the session daemon hangs up. Its the metadata |
| 1776 | * producer so calling this is safe because we are assured that no state change |
| 1777 | * can occur in the metadata thread for the streams in the hash table. |
| 1778 | */ |
| 1779 | void lttng_ustconsumer_close_metadata(struct lttng_ht *metadata_ht) |
| 1780 | { |
| 1781 | int ret; |
| 1782 | struct lttng_ht_iter iter; |
| 1783 | struct lttng_consumer_stream *stream; |
| 1784 | |
| 1785 | assert(metadata_ht); |
| 1786 | assert(metadata_ht->ht); |
| 1787 | |
| 1788 | DBG("UST consumer closing all metadata streams"); |
| 1789 | |
| 1790 | rcu_read_lock(); |
| 1791 | cds_lfht_for_each_entry(metadata_ht->ht, &iter.iter, stream, |
| 1792 | node.node) { |
| 1793 | int fd = stream->wait_fd; |
| 1794 | |
| 1795 | /* |
| 1796 | * Whatever happens here we have to continue to try to close every |
| 1797 | * streams. Let's report at least the error on failure. |
| 1798 | */ |
| 1799 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); |
| 1800 | if (ret) { |
| 1801 | ERR("Unable to close metadata stream fd %d ret %d", fd, ret); |
| 1802 | } |
| 1803 | DBG("Metadata wait fd %d closed", fd); |
| 1804 | } |
| 1805 | rcu_read_unlock(); |
| 1806 | } |
| 1807 | |
| 1808 | void lttng_ustconsumer_close_stream_wakeup(struct lttng_consumer_stream *stream) |
| 1809 | { |
| 1810 | int ret; |
| 1811 | |
| 1812 | ret = ustctl_stream_close_wakeup_fd(stream->ustream); |
| 1813 | if (ret < 0) { |
| 1814 | ERR("Unable to close wakeup fd"); |
| 1815 | } |
| 1816 | } |
| 1817 | |
| 1818 | int lttng_ustconsumer_request_metadata(struct lttng_consumer_local_data *ctx, |
| 1819 | struct lttng_consumer_channel *channel) |
| 1820 | { |
| 1821 | struct lttcomm_metadata_request_msg request; |
| 1822 | struct lttcomm_consumer_msg msg; |
| 1823 | enum lttng_error_code ret_code = LTTNG_OK; |
| 1824 | uint64_t len, key, offset; |
| 1825 | int ret; |
| 1826 | |
| 1827 | assert(channel); |
| 1828 | assert(channel->metadata_cache); |
| 1829 | |
| 1830 | /* send the metadata request to sessiond */ |
| 1831 | switch (consumer_data.type) { |
| 1832 | case LTTNG_CONSUMER64_UST: |
| 1833 | request.bits_per_long = 64; |
| 1834 | break; |
| 1835 | case LTTNG_CONSUMER32_UST: |
| 1836 | request.bits_per_long = 32; |
| 1837 | break; |
| 1838 | default: |
| 1839 | request.bits_per_long = 0; |
| 1840 | break; |
| 1841 | } |
| 1842 | |
| 1843 | request.session_id = channel->session_id; |
| 1844 | request.session_id_per_pid = channel->session_id_per_pid; |
| 1845 | request.uid = channel->uid; |
| 1846 | request.key = channel->key; |
| 1847 | DBG("Sending metadata request to sessiond, session id %" PRIu64 |
| 1848 | ", per-pid %" PRIu64, |
| 1849 | channel->session_id, |
| 1850 | channel->session_id_per_pid); |
| 1851 | |
| 1852 | ret = lttcomm_send_unix_sock(ctx->consumer_metadata_socket, &request, |
| 1853 | sizeof(request)); |
| 1854 | if (ret < 0) { |
| 1855 | ERR("Asking metadata to sessiond"); |
| 1856 | goto end; |
| 1857 | } |
| 1858 | |
| 1859 | /* Receive the metadata from sessiond */ |
| 1860 | ret = lttcomm_recv_unix_sock(ctx->consumer_metadata_socket, &msg, |
| 1861 | sizeof(msg)); |
| 1862 | if (ret != sizeof(msg)) { |
| 1863 | DBG("Consumer received unexpected message size %d (expects %zu)", |
| 1864 | ret, sizeof(msg)); |
| 1865 | lttng_consumer_send_error(ctx, LTTCOMM_CONSUMERD_ERROR_RECV_CMD); |
| 1866 | /* |
| 1867 | * The ret value might 0 meaning an orderly shutdown but this is ok |
| 1868 | * since the caller handles this. |
| 1869 | */ |
| 1870 | goto end; |
| 1871 | } |
| 1872 | |
| 1873 | if (msg.cmd_type == LTTNG_ERR_UND) { |
| 1874 | /* No registry found */ |
| 1875 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, |
| 1876 | ret_code); |
| 1877 | ret = 0; |
| 1878 | goto end; |
| 1879 | } else if (msg.cmd_type != LTTNG_CONSUMER_PUSH_METADATA) { |
| 1880 | ERR("Unexpected cmd_type received %d", msg.cmd_type); |
| 1881 | ret = -1; |
| 1882 | goto end; |
| 1883 | } |
| 1884 | |
| 1885 | len = msg.u.push_metadata.len; |
| 1886 | key = msg.u.push_metadata.key; |
| 1887 | offset = msg.u.push_metadata.target_offset; |
| 1888 | |
| 1889 | assert(key == channel->key); |
| 1890 | if (len == 0) { |
| 1891 | DBG("No new metadata to receive for key %" PRIu64, key); |
| 1892 | } |
| 1893 | |
| 1894 | /* Tell session daemon we are ready to receive the metadata. */ |
| 1895 | ret = consumer_send_status_msg(ctx->consumer_metadata_socket, |
| 1896 | LTTNG_OK); |
| 1897 | if (ret < 0 || len == 0) { |
| 1898 | /* |
| 1899 | * Somehow, the session daemon is not responding anymore or there is |
| 1900 | * nothing to receive. |
| 1901 | */ |
| 1902 | goto end; |
| 1903 | } |
| 1904 | |
| 1905 | ret_code = lttng_ustconsumer_recv_metadata(ctx->consumer_metadata_socket, |
| 1906 | key, offset, len, channel); |
| 1907 | if (ret_code >= 0) { |
| 1908 | /* |
| 1909 | * Only send the status msg if the sessiond is alive meaning a positive |
| 1910 | * ret code. |
| 1911 | */ |
| 1912 | (void) consumer_send_status_msg(ctx->consumer_metadata_socket, ret_code); |
| 1913 | } |
| 1914 | ret = 0; |
| 1915 | |
| 1916 | end: |
| 1917 | return ret; |
| 1918 | } |