| 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 |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * as published by the Free Software Foundation; only version 2 |
| 8 | * of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | */ |
| 19 | |
| 20 | #define _GNU_SOURCE |
| 21 | #include <assert.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/types.h> |
| 29 | #include <unistd.h> |
| 30 | |
| 31 | #include <common/common.h> |
| 32 | #include <common/kernel-ctl/kernel-ctl.h> |
| 33 | #include <common/sessiond-comm/sessiond-comm.h> |
| 34 | #include <common/kernel-consumer/kernel-consumer.h> |
| 35 | #include <common/ust-consumer/ust-consumer.h> |
| 36 | |
| 37 | #include "consumer.h" |
| 38 | |
| 39 | struct lttng_consumer_global_data consumer_data = { |
| 40 | .stream_count = 0, |
| 41 | .need_update = 1, |
| 42 | .type = LTTNG_CONSUMER_UNKNOWN, |
| 43 | }; |
| 44 | |
| 45 | /* timeout parameter, to control the polling thread grace period. */ |
| 46 | int consumer_poll_timeout = -1; |
| 47 | |
| 48 | /* |
| 49 | * Flag to inform the polling thread to quit when all fd hung up. Updated by |
| 50 | * the consumer_thread_receive_fds when it notices that all fds has hung up. |
| 51 | * Also updated by the signal handler (consumer_should_exit()). Read by the |
| 52 | * polling threads. |
| 53 | */ |
| 54 | volatile int consumer_quit = 0; |
| 55 | |
| 56 | /* |
| 57 | * Find a stream. The consumer_data.lock must be locked during this |
| 58 | * call. |
| 59 | */ |
| 60 | static struct lttng_consumer_stream *consumer_find_stream(int key) |
| 61 | { |
| 62 | struct lttng_ht_iter iter; |
| 63 | struct lttng_ht_node_ulong *node; |
| 64 | struct lttng_consumer_stream *stream = NULL; |
| 65 | |
| 66 | /* Negative keys are lookup failures */ |
| 67 | if (key < 0) |
| 68 | return NULL; |
| 69 | |
| 70 | rcu_read_lock(); |
| 71 | |
| 72 | lttng_ht_lookup(consumer_data.stream_ht, (void *)((unsigned long) key), |
| 73 | &iter); |
| 74 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 75 | if (node != NULL) { |
| 76 | stream = caa_container_of(node, struct lttng_consumer_stream, node); |
| 77 | } |
| 78 | |
| 79 | rcu_read_unlock(); |
| 80 | |
| 81 | return stream; |
| 82 | } |
| 83 | |
| 84 | static void consumer_steal_stream_key(int key) |
| 85 | { |
| 86 | struct lttng_consumer_stream *stream; |
| 87 | |
| 88 | stream = consumer_find_stream(key); |
| 89 | if (stream) |
| 90 | stream->key = -1; |
| 91 | } |
| 92 | |
| 93 | static struct lttng_consumer_channel *consumer_find_channel(int key) |
| 94 | { |
| 95 | struct lttng_ht_iter iter; |
| 96 | struct lttng_ht_node_ulong *node; |
| 97 | struct lttng_consumer_channel *channel = NULL; |
| 98 | |
| 99 | /* Negative keys are lookup failures */ |
| 100 | if (key < 0) |
| 101 | return NULL; |
| 102 | |
| 103 | rcu_read_lock(); |
| 104 | |
| 105 | lttng_ht_lookup(consumer_data.channel_ht, (void *)((unsigned long) key), |
| 106 | &iter); |
| 107 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 108 | if (node != NULL) { |
| 109 | channel = caa_container_of(node, struct lttng_consumer_channel, node); |
| 110 | } |
| 111 | |
| 112 | rcu_read_unlock(); |
| 113 | |
| 114 | return channel; |
| 115 | } |
| 116 | |
| 117 | static void consumer_steal_channel_key(int key) |
| 118 | { |
| 119 | struct lttng_consumer_channel *channel; |
| 120 | |
| 121 | channel = consumer_find_channel(key); |
| 122 | if (channel) |
| 123 | channel->key = -1; |
| 124 | } |
| 125 | |
| 126 | static |
| 127 | void consumer_free_stream(struct rcu_head *head) |
| 128 | { |
| 129 | struct lttng_ht_node_ulong *node = |
| 130 | caa_container_of(head, struct lttng_ht_node_ulong, head); |
| 131 | struct lttng_consumer_stream *stream = |
| 132 | caa_container_of(node, struct lttng_consumer_stream, node); |
| 133 | |
| 134 | free(stream); |
| 135 | } |
| 136 | |
| 137 | /* |
| 138 | * Remove a stream from the global list protected by a mutex. This |
| 139 | * function is also responsible for freeing its data structures. |
| 140 | */ |
| 141 | void consumer_del_stream(struct lttng_consumer_stream *stream) |
| 142 | { |
| 143 | int ret; |
| 144 | struct lttng_ht_iter iter; |
| 145 | struct lttng_consumer_channel *free_chan = NULL; |
| 146 | |
| 147 | pthread_mutex_lock(&consumer_data.lock); |
| 148 | |
| 149 | switch (consumer_data.type) { |
| 150 | case LTTNG_CONSUMER_KERNEL: |
| 151 | if (stream->mmap_base != NULL) { |
| 152 | ret = munmap(stream->mmap_base, stream->mmap_len); |
| 153 | if (ret != 0) { |
| 154 | perror("munmap"); |
| 155 | } |
| 156 | } |
| 157 | break; |
| 158 | case LTTNG_CONSUMER32_UST: |
| 159 | case LTTNG_CONSUMER64_UST: |
| 160 | lttng_ustconsumer_del_stream(stream); |
| 161 | break; |
| 162 | default: |
| 163 | ERR("Unknown consumer_data type"); |
| 164 | assert(0); |
| 165 | goto end; |
| 166 | } |
| 167 | |
| 168 | rcu_read_lock(); |
| 169 | |
| 170 | /* Get stream node from hash table */ |
| 171 | lttng_ht_lookup(consumer_data.stream_ht, |
| 172 | (void *)((unsigned long) stream->key), &iter); |
| 173 | /* |
| 174 | * Remove stream node from hash table. It can fail if it's been |
| 175 | * replaced due to key reuse. |
| 176 | */ |
| 177 | (void) lttng_ht_del(consumer_data.stream_ht, &iter); |
| 178 | |
| 179 | rcu_read_unlock(); |
| 180 | |
| 181 | if (consumer_data.stream_count <= 0) { |
| 182 | goto end; |
| 183 | } |
| 184 | consumer_data.stream_count--; |
| 185 | if (!stream) { |
| 186 | goto end; |
| 187 | } |
| 188 | if (stream->out_fd >= 0) { |
| 189 | ret = close(stream->out_fd); |
| 190 | if (ret) { |
| 191 | PERROR("close"); |
| 192 | } |
| 193 | } |
| 194 | if (stream->wait_fd >= 0 && !stream->wait_fd_is_copy) { |
| 195 | ret = close(stream->wait_fd); |
| 196 | if (ret) { |
| 197 | PERROR("close"); |
| 198 | } |
| 199 | } |
| 200 | if (stream->shm_fd >= 0 && stream->wait_fd != stream->shm_fd) { |
| 201 | ret = close(stream->shm_fd); |
| 202 | if (ret) { |
| 203 | PERROR("close"); |
| 204 | } |
| 205 | } |
| 206 | if (!--stream->chan->refcount) |
| 207 | free_chan = stream->chan; |
| 208 | |
| 209 | call_rcu(&stream->node.head, consumer_free_stream); |
| 210 | end: |
| 211 | consumer_data.need_update = 1; |
| 212 | pthread_mutex_unlock(&consumer_data.lock); |
| 213 | |
| 214 | if (free_chan) |
| 215 | consumer_del_channel(free_chan); |
| 216 | } |
| 217 | |
| 218 | struct lttng_consumer_stream *consumer_allocate_stream( |
| 219 | int channel_key, int stream_key, |
| 220 | int shm_fd, int wait_fd, |
| 221 | enum lttng_consumer_stream_state state, |
| 222 | uint64_t mmap_len, |
| 223 | enum lttng_event_output output, |
| 224 | const char *path_name, |
| 225 | uid_t uid, |
| 226 | gid_t gid) |
| 227 | { |
| 228 | struct lttng_consumer_stream *stream; |
| 229 | int ret; |
| 230 | |
| 231 | stream = zmalloc(sizeof(*stream)); |
| 232 | if (stream == NULL) { |
| 233 | perror("malloc struct lttng_consumer_stream"); |
| 234 | goto end; |
| 235 | } |
| 236 | stream->chan = consumer_find_channel(channel_key); |
| 237 | if (!stream->chan) { |
| 238 | perror("Unable to find channel key"); |
| 239 | goto end; |
| 240 | } |
| 241 | stream->chan->refcount++; |
| 242 | stream->key = stream_key; |
| 243 | stream->shm_fd = shm_fd; |
| 244 | stream->wait_fd = wait_fd; |
| 245 | stream->out_fd = -1; |
| 246 | stream->out_fd_offset = 0; |
| 247 | stream->state = state; |
| 248 | stream->mmap_len = mmap_len; |
| 249 | stream->mmap_base = NULL; |
| 250 | stream->output = output; |
| 251 | stream->uid = uid; |
| 252 | stream->gid = gid; |
| 253 | strncpy(stream->path_name, path_name, PATH_MAX - 1); |
| 254 | stream->path_name[PATH_MAX - 1] = '\0'; |
| 255 | lttng_ht_node_init_ulong(&stream->node, stream->key); |
| 256 | |
| 257 | switch (consumer_data.type) { |
| 258 | case LTTNG_CONSUMER_KERNEL: |
| 259 | break; |
| 260 | case LTTNG_CONSUMER32_UST: |
| 261 | case LTTNG_CONSUMER64_UST: |
| 262 | stream->cpu = stream->chan->cpucount++; |
| 263 | ret = lttng_ustconsumer_allocate_stream(stream); |
| 264 | if (ret) { |
| 265 | free(stream); |
| 266 | return NULL; |
| 267 | } |
| 268 | break; |
| 269 | default: |
| 270 | ERR("Unknown consumer_data type"); |
| 271 | assert(0); |
| 272 | goto end; |
| 273 | } |
| 274 | DBG("Allocated stream %s (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, out_fd %d)", |
| 275 | stream->path_name, stream->key, |
| 276 | stream->shm_fd, |
| 277 | stream->wait_fd, |
| 278 | (unsigned long long) stream->mmap_len, |
| 279 | stream->out_fd); |
| 280 | end: |
| 281 | return stream; |
| 282 | } |
| 283 | |
| 284 | /* |
| 285 | * Add a stream to the global list protected by a mutex. |
| 286 | */ |
| 287 | int consumer_add_stream(struct lttng_consumer_stream *stream) |
| 288 | { |
| 289 | int ret = 0; |
| 290 | |
| 291 | pthread_mutex_lock(&consumer_data.lock); |
| 292 | /* Steal stream identifier, for UST */ |
| 293 | consumer_steal_stream_key(stream->key); |
| 294 | rcu_read_lock(); |
| 295 | /* |
| 296 | * We simply remove the old channel from the hash table. It's |
| 297 | * ok, since we know for sure the sessiond wants to replace it |
| 298 | * with the new version, because the key has been reused. |
| 299 | */ |
| 300 | (void) lttng_ht_add_replace_ulong(consumer_data.stream_ht, &stream->node); |
| 301 | rcu_read_unlock(); |
| 302 | consumer_data.stream_count++; |
| 303 | consumer_data.need_update = 1; |
| 304 | |
| 305 | switch (consumer_data.type) { |
| 306 | case LTTNG_CONSUMER_KERNEL: |
| 307 | break; |
| 308 | case LTTNG_CONSUMER32_UST: |
| 309 | case LTTNG_CONSUMER64_UST: |
| 310 | /* Streams are in CPU number order (we rely on this) */ |
| 311 | stream->cpu = stream->chan->nr_streams++; |
| 312 | break; |
| 313 | default: |
| 314 | ERR("Unknown consumer_data type"); |
| 315 | assert(0); |
| 316 | goto end; |
| 317 | } |
| 318 | |
| 319 | end: |
| 320 | pthread_mutex_unlock(&consumer_data.lock); |
| 321 | |
| 322 | return ret; |
| 323 | } |
| 324 | |
| 325 | /* |
| 326 | * Update a stream according to what we just received. |
| 327 | */ |
| 328 | void consumer_change_stream_state(int stream_key, |
| 329 | enum lttng_consumer_stream_state state) |
| 330 | { |
| 331 | struct lttng_consumer_stream *stream; |
| 332 | |
| 333 | pthread_mutex_lock(&consumer_data.lock); |
| 334 | stream = consumer_find_stream(stream_key); |
| 335 | if (stream) { |
| 336 | stream->state = state; |
| 337 | } |
| 338 | consumer_data.need_update = 1; |
| 339 | pthread_mutex_unlock(&consumer_data.lock); |
| 340 | } |
| 341 | |
| 342 | static |
| 343 | void consumer_free_channel(struct rcu_head *head) |
| 344 | { |
| 345 | struct lttng_ht_node_ulong *node = |
| 346 | caa_container_of(head, struct lttng_ht_node_ulong, head); |
| 347 | struct lttng_consumer_channel *channel = |
| 348 | caa_container_of(node, struct lttng_consumer_channel, node); |
| 349 | |
| 350 | free(channel); |
| 351 | } |
| 352 | |
| 353 | /* |
| 354 | * Remove a channel from the global list protected by a mutex. This |
| 355 | * function is also responsible for freeing its data structures. |
| 356 | */ |
| 357 | void consumer_del_channel(struct lttng_consumer_channel *channel) |
| 358 | { |
| 359 | int ret; |
| 360 | struct lttng_ht_iter iter; |
| 361 | |
| 362 | pthread_mutex_lock(&consumer_data.lock); |
| 363 | |
| 364 | switch (consumer_data.type) { |
| 365 | case LTTNG_CONSUMER_KERNEL: |
| 366 | break; |
| 367 | case LTTNG_CONSUMER32_UST: |
| 368 | case LTTNG_CONSUMER64_UST: |
| 369 | lttng_ustconsumer_del_channel(channel); |
| 370 | break; |
| 371 | default: |
| 372 | ERR("Unknown consumer_data type"); |
| 373 | assert(0); |
| 374 | goto end; |
| 375 | } |
| 376 | |
| 377 | rcu_read_lock(); |
| 378 | |
| 379 | lttng_ht_lookup(consumer_data.channel_ht, |
| 380 | (void *)((unsigned long) channel->key), &iter); |
| 381 | |
| 382 | /* |
| 383 | * Remove channel node from hash table. It can fail if it's been |
| 384 | * replaced due to key reuse. |
| 385 | */ |
| 386 | (void) lttng_ht_del(consumer_data.channel_ht, &iter); |
| 387 | |
| 388 | rcu_read_unlock(); |
| 389 | |
| 390 | if (channel->mmap_base != NULL) { |
| 391 | ret = munmap(channel->mmap_base, channel->mmap_len); |
| 392 | if (ret != 0) { |
| 393 | perror("munmap"); |
| 394 | } |
| 395 | } |
| 396 | if (channel->wait_fd >= 0 && !channel->wait_fd_is_copy) { |
| 397 | ret = close(channel->wait_fd); |
| 398 | if (ret) { |
| 399 | PERROR("close"); |
| 400 | } |
| 401 | } |
| 402 | if (channel->shm_fd >= 0 && channel->wait_fd != channel->shm_fd) { |
| 403 | ret = close(channel->shm_fd); |
| 404 | if (ret) { |
| 405 | PERROR("close"); |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | call_rcu(&channel->node.head, consumer_free_channel); |
| 410 | end: |
| 411 | pthread_mutex_unlock(&consumer_data.lock); |
| 412 | } |
| 413 | |
| 414 | struct lttng_consumer_channel *consumer_allocate_channel( |
| 415 | int channel_key, |
| 416 | int shm_fd, int wait_fd, |
| 417 | uint64_t mmap_len, |
| 418 | uint64_t max_sb_size) |
| 419 | { |
| 420 | struct lttng_consumer_channel *channel; |
| 421 | int ret; |
| 422 | |
| 423 | channel = zmalloc(sizeof(*channel)); |
| 424 | if (channel == NULL) { |
| 425 | perror("malloc struct lttng_consumer_channel"); |
| 426 | goto end; |
| 427 | } |
| 428 | channel->key = channel_key; |
| 429 | channel->shm_fd = shm_fd; |
| 430 | channel->wait_fd = wait_fd; |
| 431 | channel->mmap_len = mmap_len; |
| 432 | channel->max_sb_size = max_sb_size; |
| 433 | channel->refcount = 0; |
| 434 | channel->nr_streams = 0; |
| 435 | lttng_ht_node_init_ulong(&channel->node, channel->key); |
| 436 | |
| 437 | switch (consumer_data.type) { |
| 438 | case LTTNG_CONSUMER_KERNEL: |
| 439 | channel->mmap_base = NULL; |
| 440 | channel->mmap_len = 0; |
| 441 | break; |
| 442 | case LTTNG_CONSUMER32_UST: |
| 443 | case LTTNG_CONSUMER64_UST: |
| 444 | ret = lttng_ustconsumer_allocate_channel(channel); |
| 445 | if (ret) { |
| 446 | free(channel); |
| 447 | return NULL; |
| 448 | } |
| 449 | break; |
| 450 | default: |
| 451 | ERR("Unknown consumer_data type"); |
| 452 | assert(0); |
| 453 | goto end; |
| 454 | } |
| 455 | DBG("Allocated channel (key %d, shm_fd %d, wait_fd %d, mmap_len %llu, max_sb_size %llu)", |
| 456 | channel->key, |
| 457 | channel->shm_fd, |
| 458 | channel->wait_fd, |
| 459 | (unsigned long long) channel->mmap_len, |
| 460 | (unsigned long long) channel->max_sb_size); |
| 461 | end: |
| 462 | return channel; |
| 463 | } |
| 464 | |
| 465 | /* |
| 466 | * Add a channel to the global list protected by a mutex. |
| 467 | */ |
| 468 | int consumer_add_channel(struct lttng_consumer_channel *channel) |
| 469 | { |
| 470 | pthread_mutex_lock(&consumer_data.lock); |
| 471 | /* Steal channel identifier, for UST */ |
| 472 | consumer_steal_channel_key(channel->key); |
| 473 | rcu_read_lock(); |
| 474 | /* |
| 475 | * We simply remove the old channel from the hash table. It's |
| 476 | * ok, since we know for sure the sessiond wants to replace it |
| 477 | * with the new version, because the key has been reused. |
| 478 | */ |
| 479 | (void) lttng_ht_add_replace_ulong(consumer_data.channel_ht, &channel->node); |
| 480 | rcu_read_unlock(); |
| 481 | pthread_mutex_unlock(&consumer_data.lock); |
| 482 | |
| 483 | return 0; |
| 484 | } |
| 485 | |
| 486 | /* |
| 487 | * Allocate the pollfd structure and the local view of the out fds to avoid |
| 488 | * doing a lookup in the linked list and concurrency issues when writing is |
| 489 | * needed. Called with consumer_data.lock held. |
| 490 | * |
| 491 | * Returns the number of fds in the structures. |
| 492 | */ |
| 493 | int consumer_update_poll_array( |
| 494 | struct lttng_consumer_local_data *ctx, struct pollfd **pollfd, |
| 495 | struct lttng_consumer_stream **local_stream) |
| 496 | { |
| 497 | int i = 0; |
| 498 | struct lttng_ht_iter iter; |
| 499 | struct lttng_consumer_stream *stream; |
| 500 | |
| 501 | DBG("Updating poll fd array"); |
| 502 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, stream, |
| 503 | node.node) { |
| 504 | if (stream->state != LTTNG_CONSUMER_ACTIVE_STREAM) { |
| 505 | continue; |
| 506 | } |
| 507 | DBG("Active FD %d", stream->wait_fd); |
| 508 | (*pollfd)[i].fd = stream->wait_fd; |
| 509 | (*pollfd)[i].events = POLLIN | POLLPRI; |
| 510 | local_stream[i] = stream; |
| 511 | i++; |
| 512 | } |
| 513 | |
| 514 | /* |
| 515 | * Insert the consumer_poll_pipe at the end of the array and don't |
| 516 | * increment i so nb_fd is the number of real FD. |
| 517 | */ |
| 518 | (*pollfd)[i].fd = ctx->consumer_poll_pipe[0]; |
| 519 | (*pollfd)[i].events = POLLIN; |
| 520 | return i; |
| 521 | } |
| 522 | |
| 523 | /* |
| 524 | * Poll on the should_quit pipe and the command socket return -1 on error and |
| 525 | * should exit, 0 if data is available on the command socket |
| 526 | */ |
| 527 | int lttng_consumer_poll_socket(struct pollfd *consumer_sockpoll) |
| 528 | { |
| 529 | int num_rdy; |
| 530 | |
| 531 | restart: |
| 532 | num_rdy = poll(consumer_sockpoll, 2, -1); |
| 533 | if (num_rdy == -1) { |
| 534 | /* |
| 535 | * Restart interrupted system call. |
| 536 | */ |
| 537 | if (errno == EINTR) { |
| 538 | goto restart; |
| 539 | } |
| 540 | perror("Poll error"); |
| 541 | goto exit; |
| 542 | } |
| 543 | if (consumer_sockpoll[0].revents == POLLIN) { |
| 544 | DBG("consumer_should_quit wake up"); |
| 545 | goto exit; |
| 546 | } |
| 547 | return 0; |
| 548 | |
| 549 | exit: |
| 550 | return -1; |
| 551 | } |
| 552 | |
| 553 | /* |
| 554 | * Set the error socket. |
| 555 | */ |
| 556 | void lttng_consumer_set_error_sock( |
| 557 | struct lttng_consumer_local_data *ctx, int sock) |
| 558 | { |
| 559 | ctx->consumer_error_socket = sock; |
| 560 | } |
| 561 | |
| 562 | /* |
| 563 | * Set the command socket path. |
| 564 | */ |
| 565 | |
| 566 | void lttng_consumer_set_command_sock_path( |
| 567 | struct lttng_consumer_local_data *ctx, char *sock) |
| 568 | { |
| 569 | ctx->consumer_command_sock_path = sock; |
| 570 | } |
| 571 | |
| 572 | /* |
| 573 | * Send return code to the session daemon. |
| 574 | * If the socket is not defined, we return 0, it is not a fatal error |
| 575 | */ |
| 576 | int lttng_consumer_send_error( |
| 577 | struct lttng_consumer_local_data *ctx, int cmd) |
| 578 | { |
| 579 | if (ctx->consumer_error_socket > 0) { |
| 580 | return lttcomm_send_unix_sock(ctx->consumer_error_socket, &cmd, |
| 581 | sizeof(enum lttcomm_sessiond_command)); |
| 582 | } |
| 583 | |
| 584 | return 0; |
| 585 | } |
| 586 | |
| 587 | /* |
| 588 | * Close all the tracefiles and stream fds, should be called when all instances |
| 589 | * are destroyed. |
| 590 | */ |
| 591 | void lttng_consumer_cleanup(void) |
| 592 | { |
| 593 | struct lttng_ht_iter iter; |
| 594 | struct lttng_ht_node_ulong *node; |
| 595 | |
| 596 | rcu_read_lock(); |
| 597 | |
| 598 | /* |
| 599 | * close all outfd. Called when there are no more threads running (after |
| 600 | * joining on the threads), no need to protect list iteration with mutex. |
| 601 | */ |
| 602 | cds_lfht_for_each_entry(consumer_data.stream_ht->ht, &iter.iter, node, |
| 603 | node) { |
| 604 | struct lttng_consumer_stream *stream = |
| 605 | caa_container_of(node, struct lttng_consumer_stream, node); |
| 606 | consumer_del_stream(stream); |
| 607 | } |
| 608 | |
| 609 | cds_lfht_for_each_entry(consumer_data.channel_ht->ht, &iter.iter, node, |
| 610 | node) { |
| 611 | struct lttng_consumer_channel *channel = |
| 612 | caa_container_of(node, struct lttng_consumer_channel, node); |
| 613 | consumer_del_channel(channel); |
| 614 | } |
| 615 | |
| 616 | rcu_read_unlock(); |
| 617 | } |
| 618 | |
| 619 | /* |
| 620 | * Called from signal handler. |
| 621 | */ |
| 622 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx) |
| 623 | { |
| 624 | int ret; |
| 625 | consumer_quit = 1; |
| 626 | ret = write(ctx->consumer_should_quit[1], "4", 1); |
| 627 | if (ret < 0) { |
| 628 | perror("write consumer quit"); |
| 629 | } |
| 630 | } |
| 631 | |
| 632 | void lttng_consumer_sync_trace_file( |
| 633 | struct lttng_consumer_stream *stream, off_t orig_offset) |
| 634 | { |
| 635 | int outfd = stream->out_fd; |
| 636 | |
| 637 | /* |
| 638 | * This does a blocking write-and-wait on any page that belongs to the |
| 639 | * subbuffer prior to the one we just wrote. |
| 640 | * Don't care about error values, as these are just hints and ways to |
| 641 | * limit the amount of page cache used. |
| 642 | */ |
| 643 | if (orig_offset < stream->chan->max_sb_size) { |
| 644 | return; |
| 645 | } |
| 646 | lttng_sync_file_range(outfd, orig_offset - stream->chan->max_sb_size, |
| 647 | stream->chan->max_sb_size, |
| 648 | SYNC_FILE_RANGE_WAIT_BEFORE |
| 649 | | SYNC_FILE_RANGE_WRITE |
| 650 | | SYNC_FILE_RANGE_WAIT_AFTER); |
| 651 | /* |
| 652 | * Give hints to the kernel about how we access the file: |
| 653 | * POSIX_FADV_DONTNEED : we won't re-access data in a near future after |
| 654 | * we write it. |
| 655 | * |
| 656 | * We need to call fadvise again after the file grows because the |
| 657 | * kernel does not seem to apply fadvise to non-existing parts of the |
| 658 | * file. |
| 659 | * |
| 660 | * Call fadvise _after_ having waited for the page writeback to |
| 661 | * complete because the dirty page writeback semantic is not well |
| 662 | * defined. So it can be expected to lead to lower throughput in |
| 663 | * streaming. |
| 664 | */ |
| 665 | posix_fadvise(outfd, orig_offset - stream->chan->max_sb_size, |
| 666 | stream->chan->max_sb_size, POSIX_FADV_DONTNEED); |
| 667 | } |
| 668 | |
| 669 | /* |
| 670 | * Initialise the necessary environnement : |
| 671 | * - create a new context |
| 672 | * - create the poll_pipe |
| 673 | * - create the should_quit pipe (for signal handler) |
| 674 | * - create the thread pipe (for splice) |
| 675 | * |
| 676 | * Takes a function pointer as argument, this function is called when data is |
| 677 | * available on a buffer. This function is responsible to do the |
| 678 | * kernctl_get_next_subbuf, read the data with mmap or splice depending on the |
| 679 | * buffer configuration and then kernctl_put_next_subbuf at the end. |
| 680 | * |
| 681 | * Returns a pointer to the new context or NULL on error. |
| 682 | */ |
| 683 | struct lttng_consumer_local_data *lttng_consumer_create( |
| 684 | enum lttng_consumer_type type, |
| 685 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
| 686 | struct lttng_consumer_local_data *ctx), |
| 687 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
| 688 | int (*recv_stream)(struct lttng_consumer_stream *stream), |
| 689 | int (*update_stream)(int stream_key, uint32_t state)) |
| 690 | { |
| 691 | int ret, i; |
| 692 | struct lttng_consumer_local_data *ctx; |
| 693 | |
| 694 | assert(consumer_data.type == LTTNG_CONSUMER_UNKNOWN || |
| 695 | consumer_data.type == type); |
| 696 | consumer_data.type = type; |
| 697 | |
| 698 | ctx = zmalloc(sizeof(struct lttng_consumer_local_data)); |
| 699 | if (ctx == NULL) { |
| 700 | perror("allocating context"); |
| 701 | goto error; |
| 702 | } |
| 703 | |
| 704 | ctx->consumer_error_socket = -1; |
| 705 | /* assign the callbacks */ |
| 706 | ctx->on_buffer_ready = buffer_ready; |
| 707 | ctx->on_recv_channel = recv_channel; |
| 708 | ctx->on_recv_stream = recv_stream; |
| 709 | ctx->on_update_stream = update_stream; |
| 710 | |
| 711 | ret = pipe(ctx->consumer_poll_pipe); |
| 712 | if (ret < 0) { |
| 713 | perror("Error creating poll pipe"); |
| 714 | goto error_poll_pipe; |
| 715 | } |
| 716 | |
| 717 | ret = pipe(ctx->consumer_should_quit); |
| 718 | if (ret < 0) { |
| 719 | perror("Error creating recv pipe"); |
| 720 | goto error_quit_pipe; |
| 721 | } |
| 722 | |
| 723 | ret = pipe(ctx->consumer_thread_pipe); |
| 724 | if (ret < 0) { |
| 725 | perror("Error creating thread pipe"); |
| 726 | goto error_thread_pipe; |
| 727 | } |
| 728 | |
| 729 | return ctx; |
| 730 | |
| 731 | |
| 732 | error_thread_pipe: |
| 733 | for (i = 0; i < 2; i++) { |
| 734 | int err; |
| 735 | |
| 736 | err = close(ctx->consumer_should_quit[i]); |
| 737 | if (err) { |
| 738 | PERROR("close"); |
| 739 | } |
| 740 | } |
| 741 | error_quit_pipe: |
| 742 | for (i = 0; i < 2; i++) { |
| 743 | int err; |
| 744 | |
| 745 | err = close(ctx->consumer_poll_pipe[i]); |
| 746 | if (err) { |
| 747 | PERROR("close"); |
| 748 | } |
| 749 | } |
| 750 | error_poll_pipe: |
| 751 | free(ctx); |
| 752 | error: |
| 753 | return NULL; |
| 754 | } |
| 755 | |
| 756 | /* |
| 757 | * Close all fds associated with the instance and free the context. |
| 758 | */ |
| 759 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx) |
| 760 | { |
| 761 | int ret; |
| 762 | |
| 763 | ret = close(ctx->consumer_error_socket); |
| 764 | if (ret) { |
| 765 | PERROR("close"); |
| 766 | } |
| 767 | ret = close(ctx->consumer_thread_pipe[0]); |
| 768 | if (ret) { |
| 769 | PERROR("close"); |
| 770 | } |
| 771 | ret = close(ctx->consumer_thread_pipe[1]); |
| 772 | if (ret) { |
| 773 | PERROR("close"); |
| 774 | } |
| 775 | ret = close(ctx->consumer_poll_pipe[0]); |
| 776 | if (ret) { |
| 777 | PERROR("close"); |
| 778 | } |
| 779 | ret = close(ctx->consumer_poll_pipe[1]); |
| 780 | if (ret) { |
| 781 | PERROR("close"); |
| 782 | } |
| 783 | ret = close(ctx->consumer_should_quit[0]); |
| 784 | if (ret) { |
| 785 | PERROR("close"); |
| 786 | } |
| 787 | ret = close(ctx->consumer_should_quit[1]); |
| 788 | if (ret) { |
| 789 | PERROR("close"); |
| 790 | } |
| 791 | unlink(ctx->consumer_command_sock_path); |
| 792 | free(ctx); |
| 793 | } |
| 794 | |
| 795 | /* |
| 796 | * Mmap the ring buffer, read it and write the data to the tracefile. |
| 797 | * |
| 798 | * Returns the number of bytes written |
| 799 | */ |
| 800 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
| 801 | struct lttng_consumer_local_data *ctx, |
| 802 | struct lttng_consumer_stream *stream, unsigned long len) |
| 803 | { |
| 804 | switch (consumer_data.type) { |
| 805 | case LTTNG_CONSUMER_KERNEL: |
| 806 | return lttng_kconsumer_on_read_subbuffer_mmap(ctx, stream, len); |
| 807 | case LTTNG_CONSUMER32_UST: |
| 808 | case LTTNG_CONSUMER64_UST: |
| 809 | return lttng_ustconsumer_on_read_subbuffer_mmap(ctx, stream, len); |
| 810 | default: |
| 811 | ERR("Unknown consumer_data type"); |
| 812 | assert(0); |
| 813 | } |
| 814 | |
| 815 | return 0; |
| 816 | } |
| 817 | |
| 818 | /* |
| 819 | * Splice the data from the ring buffer to the tracefile. |
| 820 | * |
| 821 | * Returns the number of bytes spliced. |
| 822 | */ |
| 823 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
| 824 | struct lttng_consumer_local_data *ctx, |
| 825 | struct lttng_consumer_stream *stream, unsigned long len) |
| 826 | { |
| 827 | switch (consumer_data.type) { |
| 828 | case LTTNG_CONSUMER_KERNEL: |
| 829 | return lttng_kconsumer_on_read_subbuffer_splice(ctx, stream, len); |
| 830 | case LTTNG_CONSUMER32_UST: |
| 831 | case LTTNG_CONSUMER64_UST: |
| 832 | return -ENOSYS; |
| 833 | default: |
| 834 | ERR("Unknown consumer_data type"); |
| 835 | assert(0); |
| 836 | return -ENOSYS; |
| 837 | } |
| 838 | |
| 839 | } |
| 840 | |
| 841 | /* |
| 842 | * Take a snapshot for a specific fd |
| 843 | * |
| 844 | * Returns 0 on success, < 0 on error |
| 845 | */ |
| 846 | int lttng_consumer_take_snapshot(struct lttng_consumer_local_data *ctx, |
| 847 | struct lttng_consumer_stream *stream) |
| 848 | { |
| 849 | switch (consumer_data.type) { |
| 850 | case LTTNG_CONSUMER_KERNEL: |
| 851 | return lttng_kconsumer_take_snapshot(ctx, stream); |
| 852 | case LTTNG_CONSUMER32_UST: |
| 853 | case LTTNG_CONSUMER64_UST: |
| 854 | return lttng_ustconsumer_take_snapshot(ctx, stream); |
| 855 | default: |
| 856 | ERR("Unknown consumer_data type"); |
| 857 | assert(0); |
| 858 | return -ENOSYS; |
| 859 | } |
| 860 | |
| 861 | } |
| 862 | |
| 863 | /* |
| 864 | * Get the produced position |
| 865 | * |
| 866 | * Returns 0 on success, < 0 on error |
| 867 | */ |
| 868 | int lttng_consumer_get_produced_snapshot( |
| 869 | struct lttng_consumer_local_data *ctx, |
| 870 | struct lttng_consumer_stream *stream, |
| 871 | unsigned long *pos) |
| 872 | { |
| 873 | switch (consumer_data.type) { |
| 874 | case LTTNG_CONSUMER_KERNEL: |
| 875 | return lttng_kconsumer_get_produced_snapshot(ctx, stream, pos); |
| 876 | case LTTNG_CONSUMER32_UST: |
| 877 | case LTTNG_CONSUMER64_UST: |
| 878 | return lttng_ustconsumer_get_produced_snapshot(ctx, stream, pos); |
| 879 | default: |
| 880 | ERR("Unknown consumer_data type"); |
| 881 | assert(0); |
| 882 | return -ENOSYS; |
| 883 | } |
| 884 | } |
| 885 | |
| 886 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
| 887 | int sock, struct pollfd *consumer_sockpoll) |
| 888 | { |
| 889 | switch (consumer_data.type) { |
| 890 | case LTTNG_CONSUMER_KERNEL: |
| 891 | return lttng_kconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
| 892 | case LTTNG_CONSUMER32_UST: |
| 893 | case LTTNG_CONSUMER64_UST: |
| 894 | return lttng_ustconsumer_recv_cmd(ctx, sock, consumer_sockpoll); |
| 895 | default: |
| 896 | ERR("Unknown consumer_data type"); |
| 897 | assert(0); |
| 898 | return -ENOSYS; |
| 899 | } |
| 900 | } |
| 901 | |
| 902 | /* |
| 903 | * This thread polls the fds in the set to consume the data and write |
| 904 | * it to tracefile if necessary. |
| 905 | */ |
| 906 | void *lttng_consumer_thread_poll_fds(void *data) |
| 907 | { |
| 908 | int num_rdy, num_hup, high_prio, ret, i; |
| 909 | struct pollfd *pollfd = NULL; |
| 910 | /* local view of the streams */ |
| 911 | struct lttng_consumer_stream **local_stream = NULL; |
| 912 | /* local view of consumer_data.fds_count */ |
| 913 | int nb_fd = 0; |
| 914 | char tmp; |
| 915 | int tmp2; |
| 916 | struct lttng_consumer_local_data *ctx = data; |
| 917 | |
| 918 | rcu_register_thread(); |
| 919 | |
| 920 | local_stream = zmalloc(sizeof(struct lttng_consumer_stream)); |
| 921 | |
| 922 | while (1) { |
| 923 | high_prio = 0; |
| 924 | num_hup = 0; |
| 925 | |
| 926 | /* |
| 927 | * the fds set has been updated, we need to update our |
| 928 | * local array as well |
| 929 | */ |
| 930 | pthread_mutex_lock(&consumer_data.lock); |
| 931 | if (consumer_data.need_update) { |
| 932 | if (pollfd != NULL) { |
| 933 | free(pollfd); |
| 934 | pollfd = NULL; |
| 935 | } |
| 936 | if (local_stream != NULL) { |
| 937 | free(local_stream); |
| 938 | local_stream = NULL; |
| 939 | } |
| 940 | |
| 941 | /* allocate for all fds + 1 for the consumer_poll_pipe */ |
| 942 | pollfd = zmalloc((consumer_data.stream_count + 1) * sizeof(struct pollfd)); |
| 943 | if (pollfd == NULL) { |
| 944 | perror("pollfd malloc"); |
| 945 | pthread_mutex_unlock(&consumer_data.lock); |
| 946 | goto end; |
| 947 | } |
| 948 | |
| 949 | /* allocate for all fds + 1 for the consumer_poll_pipe */ |
| 950 | local_stream = zmalloc((consumer_data.stream_count + 1) * |
| 951 | sizeof(struct lttng_consumer_stream)); |
| 952 | if (local_stream == NULL) { |
| 953 | perror("local_stream malloc"); |
| 954 | pthread_mutex_unlock(&consumer_data.lock); |
| 955 | goto end; |
| 956 | } |
| 957 | ret = consumer_update_poll_array(ctx, &pollfd, local_stream); |
| 958 | if (ret < 0) { |
| 959 | ERR("Error in allocating pollfd or local_outfds"); |
| 960 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); |
| 961 | pthread_mutex_unlock(&consumer_data.lock); |
| 962 | goto end; |
| 963 | } |
| 964 | nb_fd = ret; |
| 965 | consumer_data.need_update = 0; |
| 966 | } |
| 967 | pthread_mutex_unlock(&consumer_data.lock); |
| 968 | |
| 969 | /* No FDs and consumer_quit, consumer_cleanup the thread */ |
| 970 | if (nb_fd == 0 && consumer_quit == 1) { |
| 971 | goto end; |
| 972 | } |
| 973 | /* poll on the array of fds */ |
| 974 | restart: |
| 975 | DBG("polling on %d fd", nb_fd + 1); |
| 976 | num_rdy = poll(pollfd, nb_fd + 1, consumer_poll_timeout); |
| 977 | DBG("poll num_rdy : %d", num_rdy); |
| 978 | if (num_rdy == -1) { |
| 979 | /* |
| 980 | * Restart interrupted system call. |
| 981 | */ |
| 982 | if (errno == EINTR) { |
| 983 | goto restart; |
| 984 | } |
| 985 | perror("Poll error"); |
| 986 | lttng_consumer_send_error(ctx, CONSUMERD_POLL_ERROR); |
| 987 | goto end; |
| 988 | } else if (num_rdy == 0) { |
| 989 | DBG("Polling thread timed out"); |
| 990 | goto end; |
| 991 | } |
| 992 | |
| 993 | /* |
| 994 | * If the consumer_poll_pipe triggered poll go |
| 995 | * directly to the beginning of the loop to update the |
| 996 | * array. We want to prioritize array update over |
| 997 | * low-priority reads. |
| 998 | */ |
| 999 | if (pollfd[nb_fd].revents & POLLIN) { |
| 1000 | DBG("consumer_poll_pipe wake up"); |
| 1001 | tmp2 = read(ctx->consumer_poll_pipe[0], &tmp, 1); |
| 1002 | if (tmp2 < 0) { |
| 1003 | perror("read consumer poll"); |
| 1004 | } |
| 1005 | continue; |
| 1006 | } |
| 1007 | |
| 1008 | /* Take care of high priority channels first. */ |
| 1009 | for (i = 0; i < nb_fd; i++) { |
| 1010 | if (pollfd[i].revents & POLLPRI) { |
| 1011 | ssize_t len; |
| 1012 | |
| 1013 | DBG("Urgent read on fd %d", pollfd[i].fd); |
| 1014 | high_prio = 1; |
| 1015 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
| 1016 | /* it's ok to have an unavailable sub-buffer */ |
| 1017 | if (len < 0 && len != -EAGAIN) { |
| 1018 | goto end; |
| 1019 | } else if (len > 0) { |
| 1020 | local_stream[i]->data_read = 1; |
| 1021 | } |
| 1022 | } |
| 1023 | } |
| 1024 | |
| 1025 | /* |
| 1026 | * If we read high prio channel in this loop, try again |
| 1027 | * for more high prio data. |
| 1028 | */ |
| 1029 | if (high_prio) { |
| 1030 | continue; |
| 1031 | } |
| 1032 | |
| 1033 | /* Take care of low priority channels. */ |
| 1034 | for (i = 0; i < nb_fd; i++) { |
| 1035 | if ((pollfd[i].revents & POLLIN) || |
| 1036 | local_stream[i]->hangup_flush_done) { |
| 1037 | ssize_t len; |
| 1038 | |
| 1039 | assert(!(pollfd[i].revents & POLLERR)); |
| 1040 | assert(!(pollfd[i].revents & POLLNVAL)); |
| 1041 | DBG("Normal read on fd %d", pollfd[i].fd); |
| 1042 | len = ctx->on_buffer_ready(local_stream[i], ctx); |
| 1043 | /* it's ok to have an unavailable sub-buffer */ |
| 1044 | if (len < 0 && len != -EAGAIN) { |
| 1045 | goto end; |
| 1046 | } else if (len > 0) { |
| 1047 | local_stream[i]->data_read = 1; |
| 1048 | } |
| 1049 | } |
| 1050 | } |
| 1051 | |
| 1052 | /* Handle hangup and errors */ |
| 1053 | for (i = 0; i < nb_fd; i++) { |
| 1054 | if (!local_stream[i]->hangup_flush_done |
| 1055 | && (pollfd[i].revents & (POLLHUP | POLLERR | POLLNVAL)) |
| 1056 | && (consumer_data.type == LTTNG_CONSUMER32_UST |
| 1057 | || consumer_data.type == LTTNG_CONSUMER64_UST)) { |
| 1058 | DBG("fd %d is hup|err|nval. Attempting flush and read.", |
| 1059 | pollfd[i].fd); |
| 1060 | lttng_ustconsumer_on_stream_hangup(local_stream[i]); |
| 1061 | /* Attempt read again, for the data we just flushed. */ |
| 1062 | local_stream[i]->data_read = 1; |
| 1063 | } |
| 1064 | /* |
| 1065 | * If the poll flag is HUP/ERR/NVAL and we have |
| 1066 | * read no data in this pass, we can remove the |
| 1067 | * stream from its hash table. |
| 1068 | */ |
| 1069 | if ((pollfd[i].revents & POLLHUP)) { |
| 1070 | DBG("Polling fd %d tells it has hung up.", pollfd[i].fd); |
| 1071 | if (!local_stream[i]->data_read) { |
| 1072 | consumer_del_stream(local_stream[i]); |
| 1073 | num_hup++; |
| 1074 | } |
| 1075 | } else if (pollfd[i].revents & POLLERR) { |
| 1076 | ERR("Error returned in polling fd %d.", pollfd[i].fd); |
| 1077 | if (!local_stream[i]->data_read) { |
| 1078 | consumer_del_stream(local_stream[i]); |
| 1079 | num_hup++; |
| 1080 | } |
| 1081 | } else if (pollfd[i].revents & POLLNVAL) { |
| 1082 | ERR("Polling fd %d tells fd is not open.", pollfd[i].fd); |
| 1083 | if (!local_stream[i]->data_read) { |
| 1084 | consumer_del_stream(local_stream[i]); |
| 1085 | num_hup++; |
| 1086 | } |
| 1087 | } |
| 1088 | local_stream[i]->data_read = 0; |
| 1089 | } |
| 1090 | } |
| 1091 | end: |
| 1092 | DBG("polling thread exiting"); |
| 1093 | if (pollfd != NULL) { |
| 1094 | free(pollfd); |
| 1095 | pollfd = NULL; |
| 1096 | } |
| 1097 | if (local_stream != NULL) { |
| 1098 | free(local_stream); |
| 1099 | local_stream = NULL; |
| 1100 | } |
| 1101 | rcu_unregister_thread(); |
| 1102 | return NULL; |
| 1103 | } |
| 1104 | |
| 1105 | /* |
| 1106 | * This thread listens on the consumerd socket and receives the file |
| 1107 | * descriptors from the session daemon. |
| 1108 | */ |
| 1109 | void *lttng_consumer_thread_receive_fds(void *data) |
| 1110 | { |
| 1111 | int sock, client_socket, ret; |
| 1112 | /* |
| 1113 | * structure to poll for incoming data on communication socket avoids |
| 1114 | * making blocking sockets. |
| 1115 | */ |
| 1116 | struct pollfd consumer_sockpoll[2]; |
| 1117 | struct lttng_consumer_local_data *ctx = data; |
| 1118 | |
| 1119 | rcu_register_thread(); |
| 1120 | |
| 1121 | DBG("Creating command socket %s", ctx->consumer_command_sock_path); |
| 1122 | unlink(ctx->consumer_command_sock_path); |
| 1123 | client_socket = lttcomm_create_unix_sock(ctx->consumer_command_sock_path); |
| 1124 | if (client_socket < 0) { |
| 1125 | ERR("Cannot create command socket"); |
| 1126 | goto end; |
| 1127 | } |
| 1128 | |
| 1129 | ret = lttcomm_listen_unix_sock(client_socket); |
| 1130 | if (ret < 0) { |
| 1131 | goto end; |
| 1132 | } |
| 1133 | |
| 1134 | DBG("Sending ready command to lttng-sessiond"); |
| 1135 | ret = lttng_consumer_send_error(ctx, CONSUMERD_COMMAND_SOCK_READY); |
| 1136 | /* return < 0 on error, but == 0 is not fatal */ |
| 1137 | if (ret < 0) { |
| 1138 | ERR("Error sending ready command to lttng-sessiond"); |
| 1139 | goto end; |
| 1140 | } |
| 1141 | |
| 1142 | ret = fcntl(client_socket, F_SETFL, O_NONBLOCK); |
| 1143 | if (ret < 0) { |
| 1144 | perror("fcntl O_NONBLOCK"); |
| 1145 | goto end; |
| 1146 | } |
| 1147 | |
| 1148 | /* prepare the FDs to poll : to client socket and the should_quit pipe */ |
| 1149 | consumer_sockpoll[0].fd = ctx->consumer_should_quit[0]; |
| 1150 | consumer_sockpoll[0].events = POLLIN | POLLPRI; |
| 1151 | consumer_sockpoll[1].fd = client_socket; |
| 1152 | consumer_sockpoll[1].events = POLLIN | POLLPRI; |
| 1153 | |
| 1154 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { |
| 1155 | goto end; |
| 1156 | } |
| 1157 | DBG("Connection on client_socket"); |
| 1158 | |
| 1159 | /* Blocking call, waiting for transmission */ |
| 1160 | sock = lttcomm_accept_unix_sock(client_socket); |
| 1161 | if (sock <= 0) { |
| 1162 | WARN("On accept"); |
| 1163 | goto end; |
| 1164 | } |
| 1165 | ret = fcntl(sock, F_SETFL, O_NONBLOCK); |
| 1166 | if (ret < 0) { |
| 1167 | perror("fcntl O_NONBLOCK"); |
| 1168 | goto end; |
| 1169 | } |
| 1170 | |
| 1171 | /* update the polling structure to poll on the established socket */ |
| 1172 | consumer_sockpoll[1].fd = sock; |
| 1173 | consumer_sockpoll[1].events = POLLIN | POLLPRI; |
| 1174 | |
| 1175 | while (1) { |
| 1176 | if (lttng_consumer_poll_socket(consumer_sockpoll) < 0) { |
| 1177 | goto end; |
| 1178 | } |
| 1179 | DBG("Incoming command on sock"); |
| 1180 | ret = lttng_consumer_recv_cmd(ctx, sock, consumer_sockpoll); |
| 1181 | if (ret == -ENOENT) { |
| 1182 | DBG("Received STOP command"); |
| 1183 | goto end; |
| 1184 | } |
| 1185 | if (ret < 0) { |
| 1186 | ERR("Communication interrupted on command socket"); |
| 1187 | goto end; |
| 1188 | } |
| 1189 | if (consumer_quit) { |
| 1190 | DBG("consumer_thread_receive_fds received quit from signal"); |
| 1191 | goto end; |
| 1192 | } |
| 1193 | DBG("received fds on sock"); |
| 1194 | } |
| 1195 | end: |
| 1196 | DBG("consumer_thread_receive_fds exiting"); |
| 1197 | |
| 1198 | /* |
| 1199 | * when all fds have hung up, the polling thread |
| 1200 | * can exit cleanly |
| 1201 | */ |
| 1202 | consumer_quit = 1; |
| 1203 | |
| 1204 | /* |
| 1205 | * 2s of grace period, if no polling events occur during |
| 1206 | * this period, the polling thread will exit even if there |
| 1207 | * are still open FDs (should not happen, but safety mechanism). |
| 1208 | */ |
| 1209 | consumer_poll_timeout = LTTNG_CONSUMER_POLL_TIMEOUT; |
| 1210 | |
| 1211 | /* wake up the polling thread */ |
| 1212 | ret = write(ctx->consumer_poll_pipe[1], "4", 1); |
| 1213 | if (ret < 0) { |
| 1214 | perror("poll pipe write"); |
| 1215 | } |
| 1216 | rcu_unregister_thread(); |
| 1217 | return NULL; |
| 1218 | } |
| 1219 | |
| 1220 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
| 1221 | struct lttng_consumer_local_data *ctx) |
| 1222 | { |
| 1223 | switch (consumer_data.type) { |
| 1224 | case LTTNG_CONSUMER_KERNEL: |
| 1225 | return lttng_kconsumer_read_subbuffer(stream, ctx); |
| 1226 | case LTTNG_CONSUMER32_UST: |
| 1227 | case LTTNG_CONSUMER64_UST: |
| 1228 | return lttng_ustconsumer_read_subbuffer(stream, ctx); |
| 1229 | default: |
| 1230 | ERR("Unknown consumer_data type"); |
| 1231 | assert(0); |
| 1232 | return -ENOSYS; |
| 1233 | } |
| 1234 | } |
| 1235 | |
| 1236 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream) |
| 1237 | { |
| 1238 | switch (consumer_data.type) { |
| 1239 | case LTTNG_CONSUMER_KERNEL: |
| 1240 | return lttng_kconsumer_on_recv_stream(stream); |
| 1241 | case LTTNG_CONSUMER32_UST: |
| 1242 | case LTTNG_CONSUMER64_UST: |
| 1243 | return lttng_ustconsumer_on_recv_stream(stream); |
| 1244 | default: |
| 1245 | ERR("Unknown consumer_data type"); |
| 1246 | assert(0); |
| 1247 | return -ENOSYS; |
| 1248 | } |
| 1249 | } |
| 1250 | |
| 1251 | /* |
| 1252 | * Allocate and set consumer data hash tables. |
| 1253 | */ |
| 1254 | void lttng_consumer_init(void) |
| 1255 | { |
| 1256 | consumer_data.stream_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 1257 | consumer_data.channel_ht = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 1258 | } |
| 1259 | |