| 1 | /* |
| 2 | * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca> |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * 2012 - David Goulet <dgoulet@efficios.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License, version 2 only, |
| 8 | * as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 11 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 12 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 13 | * more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | */ |
| 19 | |
| 20 | #ifndef LIB_CONSUMER_H |
| 21 | #define LIB_CONSUMER_H |
| 22 | |
| 23 | #include <limits.h> |
| 24 | #include <poll.h> |
| 25 | #include <unistd.h> |
| 26 | #include <urcu/list.h> |
| 27 | |
| 28 | #include <lttng/lttng.h> |
| 29 | |
| 30 | #include <common/hashtable/hashtable.h> |
| 31 | #include <common/compat/fcntl.h> |
| 32 | #include <common/compat/uuid.h> |
| 33 | #include <common/sessiond-comm/sessiond-comm.h> |
| 34 | #include <common/pipe.h> |
| 35 | #include <common/index/ctf-index.h> |
| 36 | |
| 37 | /* Commands for consumer */ |
| 38 | enum lttng_consumer_command { |
| 39 | LTTNG_CONSUMER_ADD_CHANNEL, |
| 40 | LTTNG_CONSUMER_ADD_STREAM, |
| 41 | /* pause, delete, active depending on fd state */ |
| 42 | LTTNG_CONSUMER_UPDATE_STREAM, |
| 43 | /* inform the consumer to quit when all fd has hang up */ |
| 44 | LTTNG_CONSUMER_STOP, /* deprecated */ |
| 45 | LTTNG_CONSUMER_ADD_RELAYD_SOCKET, |
| 46 | /* Inform the consumer to kill a specific relayd connection */ |
| 47 | LTTNG_CONSUMER_DESTROY_RELAYD, |
| 48 | /* Return to the sessiond if there is data pending for a session */ |
| 49 | LTTNG_CONSUMER_DATA_PENDING, |
| 50 | /* Consumer creates a channel and returns it to sessiond. */ |
| 51 | LTTNG_CONSUMER_ASK_CHANNEL_CREATION, |
| 52 | LTTNG_CONSUMER_GET_CHANNEL, |
| 53 | LTTNG_CONSUMER_DESTROY_CHANNEL, |
| 54 | LTTNG_CONSUMER_PUSH_METADATA, |
| 55 | LTTNG_CONSUMER_CLOSE_METADATA, |
| 56 | LTTNG_CONSUMER_SETUP_METADATA, |
| 57 | LTTNG_CONSUMER_FLUSH_CHANNEL, |
| 58 | LTTNG_CONSUMER_SNAPSHOT_CHANNEL, |
| 59 | LTTNG_CONSUMER_SNAPSHOT_METADATA, |
| 60 | LTTNG_CONSUMER_STREAMS_SENT, |
| 61 | LTTNG_CONSUMER_DISCARDED_EVENTS, |
| 62 | LTTNG_CONSUMER_LOST_PACKETS, |
| 63 | LTTNG_CONSUMER_CLEAR_QUIESCENT_CHANNEL, |
| 64 | LTTNG_CONSUMER_SET_CHANNEL_MONITOR_PIPE, |
| 65 | }; |
| 66 | |
| 67 | /* State of each fd in consumer */ |
| 68 | enum lttng_consumer_stream_state { |
| 69 | LTTNG_CONSUMER_ACTIVE_STREAM, |
| 70 | LTTNG_CONSUMER_PAUSE_STREAM, |
| 71 | LTTNG_CONSUMER_DELETE_STREAM, |
| 72 | }; |
| 73 | |
| 74 | enum lttng_consumer_type { |
| 75 | LTTNG_CONSUMER_UNKNOWN = 0, |
| 76 | LTTNG_CONSUMER_KERNEL, |
| 77 | LTTNG_CONSUMER64_UST, |
| 78 | LTTNG_CONSUMER32_UST, |
| 79 | }; |
| 80 | |
| 81 | enum consumer_endpoint_status { |
| 82 | CONSUMER_ENDPOINT_ACTIVE, |
| 83 | CONSUMER_ENDPOINT_INACTIVE, |
| 84 | }; |
| 85 | |
| 86 | enum consumer_channel_output { |
| 87 | CONSUMER_CHANNEL_MMAP = 0, |
| 88 | CONSUMER_CHANNEL_SPLICE = 1, |
| 89 | }; |
| 90 | |
| 91 | enum consumer_channel_type { |
| 92 | CONSUMER_CHANNEL_TYPE_METADATA = 0, |
| 93 | CONSUMER_CHANNEL_TYPE_DATA = 1, |
| 94 | }; |
| 95 | |
| 96 | extern struct lttng_consumer_global_data consumer_data; |
| 97 | |
| 98 | struct stream_list { |
| 99 | struct cds_list_head head; |
| 100 | unsigned int count; |
| 101 | }; |
| 102 | |
| 103 | /* Stub. */ |
| 104 | struct consumer_metadata_cache; |
| 105 | |
| 106 | struct lttng_consumer_channel { |
| 107 | /* HT node used for consumer_data.channel_ht */ |
| 108 | struct lttng_ht_node_u64 node; |
| 109 | /* Indexed key. Incremented value in the consumer. */ |
| 110 | uint64_t key; |
| 111 | /* Number of streams referencing this channel */ |
| 112 | int refcount; |
| 113 | /* Tracing session id on the session daemon side. */ |
| 114 | uint64_t session_id; |
| 115 | /* |
| 116 | * Session id when requesting metadata to the session daemon for |
| 117 | * a session with per-PID buffers. |
| 118 | */ |
| 119 | uint64_t session_id_per_pid; |
| 120 | /* Channel trace file path name. */ |
| 121 | char pathname[PATH_MAX]; |
| 122 | /* Channel name. */ |
| 123 | char name[LTTNG_SYMBOL_NAME_LEN]; |
| 124 | /* UID and GID of the session owning this channel. */ |
| 125 | uid_t uid; |
| 126 | gid_t gid; |
| 127 | /* Relayd id of the channel. -1ULL if it does not apply. */ |
| 128 | uint64_t relayd_id; |
| 129 | /* |
| 130 | * Number of streams NOT initialized yet. This is used in order to not |
| 131 | * delete this channel if streams are getting initialized. |
| 132 | */ |
| 133 | unsigned int nb_init_stream_left; |
| 134 | /* Output type (mmap or splice). */ |
| 135 | enum consumer_channel_output output; |
| 136 | /* Channel type for stream */ |
| 137 | enum consumer_channel_type type; |
| 138 | |
| 139 | /* For UST */ |
| 140 | uid_t ust_app_uid; /* Application UID. */ |
| 141 | struct ustctl_consumer_channel *uchan; |
| 142 | unsigned char uuid[UUID_STR_LEN]; |
| 143 | /* |
| 144 | * Temporary stream list used to store the streams once created and waiting |
| 145 | * to be sent to the session daemon by receiving the |
| 146 | * LTTNG_CONSUMER_GET_CHANNEL. |
| 147 | */ |
| 148 | struct stream_list streams; |
| 149 | |
| 150 | /* |
| 151 | * Set if the channel is metadata. We keep a reference to the stream |
| 152 | * because we have to flush data once pushed by the session daemon. For a |
| 153 | * regular channel, this is always set to NULL. |
| 154 | */ |
| 155 | struct lttng_consumer_stream *metadata_stream; |
| 156 | |
| 157 | /* for UST */ |
| 158 | int wait_fd; |
| 159 | /* Node within channel thread ht */ |
| 160 | struct lttng_ht_node_u64 wait_fd_node; |
| 161 | |
| 162 | /* Metadata cache is metadata channel */ |
| 163 | struct consumer_metadata_cache *metadata_cache; |
| 164 | |
| 165 | /* For UST metadata periodical flush */ |
| 166 | int switch_timer_enabled; |
| 167 | timer_t switch_timer; |
| 168 | int switch_timer_error; |
| 169 | |
| 170 | /* For the live mode */ |
| 171 | int live_timer_enabled; |
| 172 | timer_t live_timer; |
| 173 | int live_timer_error; |
| 174 | |
| 175 | /* For channel monitoring timer. */ |
| 176 | int monitor_timer_enabled; |
| 177 | timer_t monitor_timer; |
| 178 | |
| 179 | /* On-disk circular buffer */ |
| 180 | uint64_t tracefile_size; |
| 181 | uint64_t tracefile_count; |
| 182 | /* |
| 183 | * Monitor or not the streams of this channel meaning this indicates if the |
| 184 | * streams should be sent to the data/metadata thread or added to the no |
| 185 | * monitor list of the channel. |
| 186 | */ |
| 187 | unsigned int monitor; |
| 188 | |
| 189 | /* |
| 190 | * Channel lock. |
| 191 | * |
| 192 | * This lock protects against concurrent update of channel. |
| 193 | * |
| 194 | * This is nested INSIDE the consumer data lock. |
| 195 | * This is nested OUTSIDE the channel timer lock. |
| 196 | * This is nested OUTSIDE the metadata cache lock. |
| 197 | * This is nested OUTSIDE stream lock. |
| 198 | * This is nested OUTSIDE consumer_relayd_sock_pair lock. |
| 199 | */ |
| 200 | pthread_mutex_t lock; |
| 201 | |
| 202 | /* |
| 203 | * Channel teardown lock. |
| 204 | * |
| 205 | * This lock protect against teardown of channel. It is _never_ |
| 206 | * taken by the timer handler. |
| 207 | * |
| 208 | * This is nested INSIDE the consumer data lock. |
| 209 | * This is nested INSIDE the channel lock. |
| 210 | * This is nested OUTSIDE the metadata cache lock. |
| 211 | * This is nested OUTSIDE stream lock. |
| 212 | * This is nested OUTSIDE consumer_relayd_sock_pair lock. |
| 213 | */ |
| 214 | pthread_mutex_t timer_lock; |
| 215 | |
| 216 | /* Timer value in usec for live streaming. */ |
| 217 | unsigned int live_timer_interval; |
| 218 | |
| 219 | int *stream_fds; |
| 220 | int nr_stream_fds; |
| 221 | char root_shm_path[PATH_MAX]; |
| 222 | char shm_path[PATH_MAX]; |
| 223 | /* Total number of discarded events for that channel. */ |
| 224 | uint64_t discarded_events; |
| 225 | /* Total number of missed packets due to overwriting (overwrite). */ |
| 226 | uint64_t lost_packets; |
| 227 | |
| 228 | bool streams_sent_to_relayd; |
| 229 | }; |
| 230 | |
| 231 | /* |
| 232 | * Internal representation of the streams, sessiond_key is used to identify |
| 233 | * uniquely a stream. |
| 234 | */ |
| 235 | struct lttng_consumer_stream { |
| 236 | /* HT node used by the data_ht and metadata_ht */ |
| 237 | struct lttng_ht_node_u64 node; |
| 238 | /* stream indexed per channel key node */ |
| 239 | struct lttng_ht_node_u64 node_channel_id; |
| 240 | /* HT node used in consumer_data.stream_list_ht */ |
| 241 | struct lttng_ht_node_u64 node_session_id; |
| 242 | /* Pointer to associated channel. */ |
| 243 | struct lttng_consumer_channel *chan; |
| 244 | |
| 245 | /* Key by which the stream is indexed for 'node'. */ |
| 246 | uint64_t key; |
| 247 | /* |
| 248 | * File descriptor of the data output file. This can be either a file or a |
| 249 | * socket fd for relayd streaming. |
| 250 | */ |
| 251 | int out_fd; /* output file to write the data */ |
| 252 | /* Write position in the output file descriptor */ |
| 253 | off_t out_fd_offset; |
| 254 | /* Amount of bytes written to the output */ |
| 255 | uint64_t output_written; |
| 256 | enum lttng_consumer_stream_state state; |
| 257 | int shm_fd_is_copy; |
| 258 | int data_read; |
| 259 | int hangup_flush_done; |
| 260 | |
| 261 | /* |
| 262 | * Whether the stream is in a "complete" state (e.g. it does not have a |
| 263 | * partially written sub-buffer. |
| 264 | * |
| 265 | * Initialized to "false" on stream creation (first packet is empty). |
| 266 | * |
| 267 | * The various transitions of the quiescent state are: |
| 268 | * - On "start" tracing: set to false, since the stream is not |
| 269 | * "complete". |
| 270 | * - On "stop" tracing: if !quiescent -> flush FINAL (update |
| 271 | * timestamp_end), and set to true; the stream has entered a |
| 272 | * complete/quiescent state. |
| 273 | * - On "destroy" or stream/application hang-up: if !quiescent -> |
| 274 | * flush FINAL, and set to true. |
| 275 | * |
| 276 | * NOTE: Update and read are protected by the stream lock. |
| 277 | */ |
| 278 | bool quiescent; |
| 279 | |
| 280 | /* |
| 281 | * metadata_timer_lock protects flags waiting_on_metadata and |
| 282 | * missed_metadata_flush. |
| 283 | */ |
| 284 | pthread_mutex_t metadata_timer_lock; |
| 285 | /* |
| 286 | * Flag set when awaiting metadata to be pushed. Used in the |
| 287 | * timer thread to skip waiting on the stream (and stream lock) to |
| 288 | * ensure we can proceed to flushing metadata in live mode. |
| 289 | */ |
| 290 | bool waiting_on_metadata; |
| 291 | /* Raised when a timer misses a metadata flush. */ |
| 292 | bool missed_metadata_flush; |
| 293 | |
| 294 | enum lttng_event_output output; |
| 295 | /* Maximum subbuffer size. */ |
| 296 | unsigned long max_sb_size; |
| 297 | |
| 298 | /* |
| 299 | * Still used by the kernel for MMAP output. For UST, the ustctl getter is |
| 300 | * used for the mmap base and offset. |
| 301 | */ |
| 302 | void *mmap_base; |
| 303 | unsigned long mmap_len; |
| 304 | |
| 305 | /* For UST */ |
| 306 | |
| 307 | int wait_fd; |
| 308 | /* UID/GID of the user owning the session to which stream belongs */ |
| 309 | uid_t uid; |
| 310 | gid_t gid; |
| 311 | /* Network sequence number. Indicating on which relayd socket it goes. */ |
| 312 | uint64_t net_seq_idx; |
| 313 | /* |
| 314 | * Indicate if this stream was successfully sent to a relayd. This is set |
| 315 | * after the refcount of the relayd is incremented and is checked when the |
| 316 | * stream is closed before decrementing the refcount in order to avoid an |
| 317 | * unbalanced state. |
| 318 | */ |
| 319 | unsigned int sent_to_relayd; |
| 320 | |
| 321 | /* Identify if the stream is the metadata */ |
| 322 | unsigned int metadata_flag; |
| 323 | /* |
| 324 | * Last known metadata version, reset the metadata file in case |
| 325 | * of change. |
| 326 | */ |
| 327 | uint64_t metadata_version; |
| 328 | /* Used when the stream is set for network streaming */ |
| 329 | uint64_t relayd_stream_id; |
| 330 | /* |
| 331 | * When sending a stream packet to a relayd, this number is used to track |
| 332 | * the packet sent by the consumer and seen by the relayd. When sending the |
| 333 | * data header to the relayd, this number is sent and if the transmission |
| 334 | * was successful, it is incremented. |
| 335 | * |
| 336 | * Even if the full data is not fully transmitted it won't matter since |
| 337 | * only two possible error can happen after that where either the relayd |
| 338 | * died or a read error is detected on the stream making this value useless |
| 339 | * after that. |
| 340 | * |
| 341 | * This value SHOULD be read/updated atomically or with the lock acquired. |
| 342 | */ |
| 343 | uint64_t next_net_seq_num; |
| 344 | /* |
| 345 | * Lock to use the stream FDs since they are used between threads. |
| 346 | * |
| 347 | * This is nested INSIDE the consumer_data lock. |
| 348 | * This is nested INSIDE the channel lock. |
| 349 | * This is nested INSIDE the channel timer lock. |
| 350 | * This is nested OUTSIDE the metadata cache lock. |
| 351 | * This is nested OUTSIDE consumer_relayd_sock_pair lock. |
| 352 | */ |
| 353 | pthread_mutex_t lock; |
| 354 | /* Tracing session id */ |
| 355 | uint64_t session_id; |
| 356 | /* |
| 357 | * Indicates if the stream end point is still active or not (network |
| 358 | * streaming or local file system). The thread "owning" the stream is |
| 359 | * handling this status and can be notified of a state change through the |
| 360 | * consumer data appropriate pipe. |
| 361 | */ |
| 362 | enum consumer_endpoint_status endpoint_status; |
| 363 | /* Stream name. Format is: <channel_name>_<cpu_number> */ |
| 364 | char name[LTTNG_SYMBOL_NAME_LEN]; |
| 365 | /* Internal state of libustctl. */ |
| 366 | struct ustctl_consumer_stream *ustream; |
| 367 | struct cds_list_head send_node; |
| 368 | /* On-disk circular buffer */ |
| 369 | uint64_t tracefile_size_current; |
| 370 | uint64_t tracefile_count_current; |
| 371 | /* |
| 372 | * Monitor or not the streams of this channel meaning this indicates if the |
| 373 | * streams should be sent to the data/metadata thread or added to the no |
| 374 | * monitor list of the channel. |
| 375 | */ |
| 376 | unsigned int monitor; |
| 377 | /* |
| 378 | * Indicate if the stream is globally visible meaning that it has been |
| 379 | * added to the multiple hash tables. If *not* set, NO lock should be |
| 380 | * acquired in the destroy path. |
| 381 | */ |
| 382 | unsigned int globally_visible; |
| 383 | /* |
| 384 | * Pipe to wake up the metadata poll thread when the UST metadata |
| 385 | * cache is updated. |
| 386 | */ |
| 387 | int ust_metadata_poll_pipe[2]; |
| 388 | /* |
| 389 | * How much metadata was read from the metadata cache and sent |
| 390 | * to the channel. |
| 391 | */ |
| 392 | uint64_t ust_metadata_pushed; |
| 393 | /* |
| 394 | * Copy of the last discarded event value to detect the overflow of |
| 395 | * the counter. |
| 396 | */ |
| 397 | uint64_t last_discarded_events; |
| 398 | /* Copy of the sequence number of the last packet extracted. */ |
| 399 | uint64_t last_sequence_number; |
| 400 | /* |
| 401 | * Index file object of the index file for this stream. |
| 402 | */ |
| 403 | struct lttng_index_file *index_file; |
| 404 | |
| 405 | /* |
| 406 | * Local pipe to extract data when using splice. |
| 407 | */ |
| 408 | int splice_pipe[2]; |
| 409 | |
| 410 | /* |
| 411 | * Rendez-vous point between data and metadata stream in live mode. |
| 412 | */ |
| 413 | pthread_cond_t metadata_rdv; |
| 414 | pthread_mutex_t metadata_rdv_lock; |
| 415 | |
| 416 | /* Indicate if the stream still has some data to be read. */ |
| 417 | unsigned int has_data:1; |
| 418 | /* |
| 419 | * Inform the consumer or relay to reset the metadata |
| 420 | * file before writing in it (regeneration). |
| 421 | */ |
| 422 | unsigned int reset_metadata_flag:1; |
| 423 | }; |
| 424 | |
| 425 | /* |
| 426 | * Internal representation of a relayd socket pair. |
| 427 | */ |
| 428 | struct consumer_relayd_sock_pair { |
| 429 | /* Network sequence number. */ |
| 430 | uint64_t net_seq_idx; |
| 431 | /* Number of stream associated with this relayd */ |
| 432 | unsigned int refcount; |
| 433 | |
| 434 | /* |
| 435 | * This flag indicates whether or not we should destroy this object. The |
| 436 | * destruction should ONLY occurs when this flag is set and the refcount is |
| 437 | * set to zero. |
| 438 | */ |
| 439 | unsigned int destroy_flag; |
| 440 | |
| 441 | /* |
| 442 | * Mutex protecting the control socket to avoid out of order packets |
| 443 | * between threads sending data to the relayd. Since metadata data is sent |
| 444 | * over that socket, at least two sendmsg() are needed (header + data) |
| 445 | * creating a race for packets to overlap between threads using it. |
| 446 | * |
| 447 | * This is nested INSIDE the consumer_data lock. |
| 448 | * This is nested INSIDE the stream lock. |
| 449 | */ |
| 450 | pthread_mutex_t ctrl_sock_mutex; |
| 451 | |
| 452 | /* Control socket. Command and metadata are passed over it */ |
| 453 | struct lttcomm_relayd_sock control_sock; |
| 454 | |
| 455 | /* |
| 456 | * We don't need a mutex at this point since we only splice or write single |
| 457 | * large chunk of data with a header appended at the begining. Moreover, |
| 458 | * this socket is for now only used in a single thread. |
| 459 | */ |
| 460 | struct lttcomm_relayd_sock data_sock; |
| 461 | struct lttng_ht_node_u64 node; |
| 462 | |
| 463 | /* Session id on both sides for the sockets. */ |
| 464 | uint64_t relayd_session_id; |
| 465 | uint64_t sessiond_session_id; |
| 466 | }; |
| 467 | |
| 468 | /* |
| 469 | * UST consumer local data to the program. One or more instance per |
| 470 | * process. |
| 471 | */ |
| 472 | struct lttng_consumer_local_data { |
| 473 | /* |
| 474 | * Function to call when data is available on a buffer. |
| 475 | * Returns the number of bytes read, or negative error value. |
| 476 | */ |
| 477 | ssize_t (*on_buffer_ready)(struct lttng_consumer_stream *stream, |
| 478 | struct lttng_consumer_local_data *ctx); |
| 479 | /* |
| 480 | * function to call when we receive a new channel, it receives a |
| 481 | * newly allocated channel, depending on the return code of this |
| 482 | * function, the new channel will be handled by the application |
| 483 | * or the library. |
| 484 | * |
| 485 | * Returns: |
| 486 | * > 0 (success, FD is kept by application) |
| 487 | * == 0 (success, FD is left to library) |
| 488 | * < 0 (error) |
| 489 | */ |
| 490 | int (*on_recv_channel)(struct lttng_consumer_channel *channel); |
| 491 | /* |
| 492 | * function to call when we receive a new stream, it receives a |
| 493 | * newly allocated stream, depending on the return code of this |
| 494 | * function, the new stream will be handled by the application |
| 495 | * or the library. |
| 496 | * |
| 497 | * Returns: |
| 498 | * > 0 (success, FD is kept by application) |
| 499 | * == 0 (success, FD is left to library) |
| 500 | * < 0 (error) |
| 501 | */ |
| 502 | int (*on_recv_stream)(struct lttng_consumer_stream *stream); |
| 503 | /* |
| 504 | * function to call when a stream is getting updated by the session |
| 505 | * daemon, this function receives the sessiond key and the new |
| 506 | * state, depending on the return code of this function the |
| 507 | * update of state for the stream is handled by the application |
| 508 | * or the library. |
| 509 | * |
| 510 | * Returns: |
| 511 | * > 0 (success, FD is kept by application) |
| 512 | * == 0 (success, FD is left to library) |
| 513 | * < 0 (error) |
| 514 | */ |
| 515 | int (*on_update_stream)(uint64_t sessiond_key, uint32_t state); |
| 516 | enum lttng_consumer_type type; |
| 517 | /* socket to communicate errors with sessiond */ |
| 518 | int consumer_error_socket; |
| 519 | /* socket to ask metadata to sessiond. */ |
| 520 | int consumer_metadata_socket; |
| 521 | /* |
| 522 | * Protect consumer_metadata_socket. |
| 523 | * |
| 524 | * This is nested OUTSIDE the metadata cache lock. |
| 525 | */ |
| 526 | pthread_mutex_t metadata_socket_lock; |
| 527 | /* socket to exchange commands with sessiond */ |
| 528 | char *consumer_command_sock_path; |
| 529 | /* communication with splice */ |
| 530 | int consumer_channel_pipe[2]; |
| 531 | /* Data stream poll thread pipe. To transfer data stream to the thread */ |
| 532 | struct lttng_pipe *consumer_data_pipe; |
| 533 | |
| 534 | /* |
| 535 | * Data thread use that pipe to catch wakeup from read subbuffer that |
| 536 | * detects that there is still data to be read for the stream encountered. |
| 537 | * Before doing so, the stream is flagged to indicate that there is still |
| 538 | * data to be read. |
| 539 | * |
| 540 | * Both pipes (read/write) are owned and used inside the data thread. |
| 541 | */ |
| 542 | struct lttng_pipe *consumer_wakeup_pipe; |
| 543 | /* Indicate if the wakeup thread has been notified. */ |
| 544 | unsigned int has_wakeup:1; |
| 545 | |
| 546 | /* to let the signal handler wake up the fd receiver thread */ |
| 547 | int consumer_should_quit[2]; |
| 548 | /* Metadata poll thread pipe. Transfer metadata stream to it */ |
| 549 | struct lttng_pipe *consumer_metadata_pipe; |
| 550 | /* |
| 551 | * Pipe used by the channel monitoring timers to provide state samples |
| 552 | * to the session daemon (write-only). |
| 553 | */ |
| 554 | int channel_monitor_pipe; |
| 555 | }; |
| 556 | |
| 557 | /* |
| 558 | * Library-level data. One instance per process. |
| 559 | */ |
| 560 | struct lttng_consumer_global_data { |
| 561 | /* |
| 562 | * At this time, this lock is used to ensure coherence between the count |
| 563 | * and number of element in the hash table. It's also a protection for |
| 564 | * concurrent read/write between threads. |
| 565 | * |
| 566 | * This is nested OUTSIDE the stream lock. |
| 567 | * This is nested OUTSIDE the consumer_relayd_sock_pair lock. |
| 568 | */ |
| 569 | pthread_mutex_t lock; |
| 570 | |
| 571 | /* |
| 572 | * Number of streams in the data stream hash table declared outside. |
| 573 | * Protected by consumer_data.lock. |
| 574 | */ |
| 575 | int stream_count; |
| 576 | |
| 577 | /* Channel hash table protected by consumer_data.lock. */ |
| 578 | struct lttng_ht *channel_ht; |
| 579 | /* |
| 580 | * Flag specifying if the local array of FDs needs update in the |
| 581 | * poll function. Protected by consumer_data.lock. |
| 582 | */ |
| 583 | unsigned int need_update; |
| 584 | enum lttng_consumer_type type; |
| 585 | |
| 586 | /* |
| 587 | * Relayd socket(s) hashtable indexed by network sequence number. Each |
| 588 | * stream has an index which associate the right relayd socket to use. |
| 589 | */ |
| 590 | struct lttng_ht *relayd_ht; |
| 591 | |
| 592 | /* |
| 593 | * This hash table contains all streams (metadata and data) indexed by |
| 594 | * session id. In other words, the ht is indexed by session id and each |
| 595 | * bucket contains the list of associated streams. |
| 596 | * |
| 597 | * This HT uses the "node_session_id" of the consumer stream. |
| 598 | */ |
| 599 | struct lttng_ht *stream_list_ht; |
| 600 | |
| 601 | /* |
| 602 | * This HT uses the "node_channel_id" of the consumer stream. |
| 603 | */ |
| 604 | struct lttng_ht *stream_per_chan_id_ht; |
| 605 | }; |
| 606 | |
| 607 | /* Flag used to temporarily pause data consumption from testpoints. */ |
| 608 | extern int data_consumption_paused; |
| 609 | |
| 610 | /* |
| 611 | * Init consumer data structures. |
| 612 | */ |
| 613 | int lttng_consumer_init(void); |
| 614 | |
| 615 | /* |
| 616 | * Set the error socket for communication with a session daemon. |
| 617 | */ |
| 618 | void lttng_consumer_set_error_sock(struct lttng_consumer_local_data *ctx, |
| 619 | int sock); |
| 620 | |
| 621 | /* |
| 622 | * Set the command socket path for communication with a session daemon. |
| 623 | */ |
| 624 | void lttng_consumer_set_command_sock_path( |
| 625 | struct lttng_consumer_local_data *ctx, char *sock); |
| 626 | |
| 627 | /* |
| 628 | * Send return code to session daemon. |
| 629 | * |
| 630 | * Returns the return code of sendmsg : the number of bytes transmitted or -1 |
| 631 | * on error. |
| 632 | */ |
| 633 | int lttng_consumer_send_error(struct lttng_consumer_local_data *ctx, int cmd); |
| 634 | |
| 635 | /* |
| 636 | * Called from signal handler to ensure a clean exit. |
| 637 | */ |
| 638 | void lttng_consumer_should_exit(struct lttng_consumer_local_data *ctx); |
| 639 | |
| 640 | /* |
| 641 | * Cleanup the daemon's socket on exit. |
| 642 | */ |
| 643 | void lttng_consumer_cleanup(void); |
| 644 | |
| 645 | /* |
| 646 | * Poll on the should_quit pipe and the command socket return -1 on error and |
| 647 | * should exit, 0 if data is available on the command socket |
| 648 | */ |
| 649 | int lttng_consumer_poll_socket(struct pollfd *kconsumer_sockpoll); |
| 650 | |
| 651 | struct lttng_consumer_stream *consumer_allocate_stream(uint64_t channel_key, |
| 652 | uint64_t stream_key, |
| 653 | enum lttng_consumer_stream_state state, |
| 654 | const char *channel_name, |
| 655 | uid_t uid, |
| 656 | gid_t gid, |
| 657 | uint64_t relayd_id, |
| 658 | uint64_t session_id, |
| 659 | int cpu, |
| 660 | int *alloc_ret, |
| 661 | enum consumer_channel_type type, |
| 662 | unsigned int monitor); |
| 663 | struct lttng_consumer_channel *consumer_allocate_channel(uint64_t key, |
| 664 | uint64_t session_id, |
| 665 | const char *pathname, |
| 666 | const char *name, |
| 667 | uid_t uid, |
| 668 | gid_t gid, |
| 669 | uint64_t relayd_id, |
| 670 | enum lttng_event_output output, |
| 671 | uint64_t tracefile_size, |
| 672 | uint64_t tracefile_count, |
| 673 | uint64_t session_id_per_pid, |
| 674 | unsigned int monitor, |
| 675 | unsigned int live_timer_interval, |
| 676 | const char *root_shm_path, |
| 677 | const char *shm_path); |
| 678 | void consumer_del_stream(struct lttng_consumer_stream *stream, |
| 679 | struct lttng_ht *ht); |
| 680 | void consumer_del_metadata_stream(struct lttng_consumer_stream *stream, |
| 681 | struct lttng_ht *ht); |
| 682 | int consumer_add_channel(struct lttng_consumer_channel *channel, |
| 683 | struct lttng_consumer_local_data *ctx); |
| 684 | void consumer_del_channel(struct lttng_consumer_channel *channel); |
| 685 | |
| 686 | /* lttng-relayd consumer command */ |
| 687 | struct consumer_relayd_sock_pair *consumer_find_relayd(uint64_t key); |
| 688 | int consumer_send_relayd_stream(struct lttng_consumer_stream *stream, char *path); |
| 689 | int consumer_send_relayd_streams_sent(uint64_t net_seq_idx); |
| 690 | void close_relayd_stream(struct lttng_consumer_stream *stream); |
| 691 | struct lttng_consumer_channel *consumer_find_channel(uint64_t key); |
| 692 | int consumer_handle_stream_before_relayd(struct lttng_consumer_stream *stream, |
| 693 | size_t data_size); |
| 694 | void consumer_steal_stream_key(int key, struct lttng_ht *ht); |
| 695 | |
| 696 | struct lttng_consumer_local_data *lttng_consumer_create( |
| 697 | enum lttng_consumer_type type, |
| 698 | ssize_t (*buffer_ready)(struct lttng_consumer_stream *stream, |
| 699 | struct lttng_consumer_local_data *ctx), |
| 700 | int (*recv_channel)(struct lttng_consumer_channel *channel), |
| 701 | int (*recv_stream)(struct lttng_consumer_stream *stream), |
| 702 | int (*update_stream)(uint64_t sessiond_key, uint32_t state)); |
| 703 | void lttng_consumer_destroy(struct lttng_consumer_local_data *ctx); |
| 704 | ssize_t lttng_consumer_on_read_subbuffer_mmap( |
| 705 | struct lttng_consumer_local_data *ctx, |
| 706 | struct lttng_consumer_stream *stream, unsigned long len, |
| 707 | unsigned long padding, |
| 708 | struct ctf_packet_index *index); |
| 709 | ssize_t lttng_consumer_on_read_subbuffer_splice( |
| 710 | struct lttng_consumer_local_data *ctx, |
| 711 | struct lttng_consumer_stream *stream, unsigned long len, |
| 712 | unsigned long padding, |
| 713 | struct ctf_packet_index *index); |
| 714 | int lttng_consumer_take_snapshot(struct lttng_consumer_stream *stream); |
| 715 | int lttng_consumer_get_produced_snapshot(struct lttng_consumer_stream *stream, |
| 716 | unsigned long *pos); |
| 717 | int lttng_ustconsumer_get_wakeup_fd(struct lttng_consumer_stream *stream); |
| 718 | int lttng_ustconsumer_close_wakeup_fd(struct lttng_consumer_stream *stream); |
| 719 | void *consumer_thread_metadata_poll(void *data); |
| 720 | void *consumer_thread_data_poll(void *data); |
| 721 | void *consumer_thread_sessiond_poll(void *data); |
| 722 | void *consumer_thread_channel_poll(void *data); |
| 723 | int lttng_consumer_recv_cmd(struct lttng_consumer_local_data *ctx, |
| 724 | int sock, struct pollfd *consumer_sockpoll); |
| 725 | |
| 726 | ssize_t lttng_consumer_read_subbuffer(struct lttng_consumer_stream *stream, |
| 727 | struct lttng_consumer_local_data *ctx); |
| 728 | int lttng_consumer_on_recv_stream(struct lttng_consumer_stream *stream); |
| 729 | int consumer_add_relayd_socket(uint64_t net_seq_idx, int sock_type, |
| 730 | struct lttng_consumer_local_data *ctx, int sock, |
| 731 | struct pollfd *consumer_sockpoll, struct lttcomm_relayd_sock *relayd_sock, |
| 732 | uint64_t sessiond_id, uint64_t relayd_session_id); |
| 733 | void consumer_flag_relayd_for_destroy( |
| 734 | struct consumer_relayd_sock_pair *relayd); |
| 735 | int consumer_data_pending(uint64_t id); |
| 736 | int consumer_send_status_msg(int sock, int ret_code); |
| 737 | int consumer_send_status_channel(int sock, |
| 738 | struct lttng_consumer_channel *channel); |
| 739 | void notify_thread_del_channel(struct lttng_consumer_local_data *ctx, |
| 740 | uint64_t key); |
| 741 | void consumer_destroy_relayd(struct consumer_relayd_sock_pair *relayd); |
| 742 | unsigned long consumer_get_consume_start_pos(unsigned long consumed_pos, |
| 743 | unsigned long produced_pos, uint64_t nb_packets_per_stream, |
| 744 | uint64_t max_sb_size); |
| 745 | int consumer_add_data_stream(struct lttng_consumer_stream *stream); |
| 746 | void consumer_del_stream_for_data(struct lttng_consumer_stream *stream); |
| 747 | int consumer_add_metadata_stream(struct lttng_consumer_stream *stream); |
| 748 | void consumer_del_stream_for_metadata(struct lttng_consumer_stream *stream); |
| 749 | int consumer_create_index_file(struct lttng_consumer_stream *stream); |
| 750 | |
| 751 | #endif /* LIB_CONSUMER_H */ |