src/common/sessiond-comm/sessiond-comm.h

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  *                      Julien Desfossez <julien.desfossez@polymtl.ca>
   4  *                      Mathieu Desnoyers <mathieu.desnoyers@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 /*
  21  * This header is meant for liblttng and libust internal use ONLY. These
  22  * declarations should NOT be considered stable API.
  23  */
  24
  25 #ifndef _LTTNG_SESSIOND_COMM_H
  26 #define _LTTNG_SESSIOND_COMM_H
  27
  28 #include <limits.h>
  29 #include <lttng/lttng.h>
  30 #include <lttng/snapshot-internal.h>
  31 #include <lttng/save-internal.h>
  32 #include <lttng/channel-internal.h>
  33 #include <lttng/trigger/trigger-internal.h>
  34 #include <common/compat/socket.h>
  35 #include <common/uri.h>
  36 #include <common/defaults.h>
  37 #include <common/compat/uuid.h>
  38
  39 #include <arpa/inet.h>
  40 #include <netinet/in.h>
  41 #include <sys/un.h>
  42
  43 #include "inet.h"
  44 #include "inet6.h"
  45 #include <common/unix.h>
  46
  47 /* Queue size of listen(2) */
  48 #define LTTNG_SESSIOND_COMM_MAX_LISTEN 64
  49
  50 /* Maximum number of FDs that can be sent over a Unix socket */
  51 #define LTTCOMM_MAX_SEND_FDS           4
  52
  53 /*
  54  * Get the error code index from 0 since LTTCOMM_OK start at 1000
  55  */
  56 #define LTTCOMM_ERR_INDEX(code) (code - LTTCOMM_CONSUMERD_COMMAND_SOCK_READY)
  57
  58 enum lttcomm_sessiond_command {
  59         /* Tracer command */
  60         LTTNG_ADD_CONTEXT                   = 0,
  61         /* LTTNG_CALIBRATE used to be here */
  62         LTTNG_DISABLE_CHANNEL               = 2,
  63         LTTNG_DISABLE_EVENT                 = 3,
  64         LTTNG_LIST_SYSCALLS                 = 4,
  65         LTTNG_ENABLE_CHANNEL                = 5,
  66         LTTNG_ENABLE_EVENT                  = 6,
  67         /* 7 */
  68         /* Session daemon command */
  69         LTTNG_CREATE_SESSION                = 8,
  70         LTTNG_DESTROY_SESSION               = 9,
  71         LTTNG_LIST_CHANNELS                 = 10,
  72         LTTNG_LIST_DOMAINS                  = 11,
  73         LTTNG_LIST_EVENTS                   = 12,
  74         LTTNG_LIST_SESSIONS                 = 13,
  75         LTTNG_LIST_TRACEPOINTS              = 14,
  76         LTTNG_REGISTER_CONSUMER             = 15,
  77         LTTNG_START_TRACE                   = 16,
  78         LTTNG_STOP_TRACE                    = 17,
  79         LTTNG_LIST_TRACEPOINT_FIELDS        = 18,
  80
  81         /* Consumer */
  82         LTTNG_DISABLE_CONSUMER              = 19,
  83         LTTNG_ENABLE_CONSUMER               = 20,
  84         LTTNG_SET_CONSUMER_URI              = 21,
  85         /* 22 */
  86         /* 23 */
  87         LTTNG_DATA_PENDING                  = 24,
  88         LTTNG_SNAPSHOT_ADD_OUTPUT           = 25,
  89         LTTNG_SNAPSHOT_DEL_OUTPUT           = 26,
  90         LTTNG_SNAPSHOT_LIST_OUTPUT          = 27,
  91         LTTNG_SNAPSHOT_RECORD               = 28,
  92         LTTNG_CREATE_SESSION_SNAPSHOT       = 29,
  93         LTTNG_CREATE_SESSION_LIVE           = 30,
  94         LTTNG_SAVE_SESSION                  = 31,
  95         LTTNG_TRACK_PID                     = 32,
  96         LTTNG_UNTRACK_PID                   = 33,
  97         LTTNG_LIST_TRACKER_PIDS             = 34,
  98         LTTNG_SET_SESSION_SHM_PATH          = 40,
  99         LTTNG_REGENERATE_METADATA           = 41,
 100         LTTNG_REGENERATE_STATEDUMP          = 42,
 101         LTTNG_REGISTER_TRIGGER              = 43,
 102         LTTNG_UNREGISTER_TRIGGER            = 44,
 103         LTTNG_ROTATE_SESSION                = 45,
 104 };
 105
 106 enum lttcomm_relayd_command {
 107         RELAYD_ADD_STREAM                   = 1,
 108         RELAYD_CREATE_SESSION               = 2,
 109         RELAYD_START_DATA                   = 3,
 110         RELAYD_UPDATE_SYNC_INFO             = 4,
 111         RELAYD_VERSION                      = 5,
 112         RELAYD_SEND_METADATA                = 6,
 113         RELAYD_CLOSE_STREAM                 = 7,
 114         RELAYD_DATA_PENDING                 = 8,
 115         RELAYD_QUIESCENT_CONTROL            = 9,
 116         RELAYD_BEGIN_DATA_PENDING           = 10,
 117         RELAYD_END_DATA_PENDING             = 11,
 118         RELAYD_ADD_INDEX                    = 12,
 119         RELAYD_SEND_INDEX                   = 13,
 120         RELAYD_CLOSE_INDEX                  = 14,
 121         /* Live-reading commands (2.4+). */
 122         RELAYD_LIST_SESSIONS                = 15,
 123         /* All streams of the channel have been sent to the relayd (2.4+). */
 124         RELAYD_STREAMS_SENT                 = 16,
 125         /* Ask the relay to reset the metadata trace file (2.8+) */
 126         RELAYD_RESET_METADATA               = 17,
 127         /* Ask the relay to rotate a stream file (2.11+) */
 128         RELAYD_ROTATE_STREAM                = 18,
 129         /* Rename a chunk after the rotation is completed (2.11+) */
 130         RELAYD_ROTATE_RENAME                = 19,
 131         /* Check if a chunk has data pending (2.11+) */
 132         RELAYD_ROTATE_PENDING               = 20,
 133         /* Create a folder on the relayd FS (2.11+) */
 134         RELAYD_MKDIR                        = 21,
 135 };
 136
 137 /*
 138  * lttcomm error code.
 139  */
 140 enum lttcomm_return_code {
 141         LTTCOMM_CONSUMERD_SUCCESS            = 0,   /* Everything went fine. */
 142         LTTCOMM_CONSUMERD_COMMAND_SOCK_READY = 1,   /* Command socket ready */
 143         LTTCOMM_CONSUMERD_SUCCESS_RECV_FD,          /* Success on receiving fds */
 144         LTTCOMM_CONSUMERD_ERROR_RECV_FD,            /* Error on receiving fds */
 145         LTTCOMM_CONSUMERD_ERROR_RECV_CMD,           /* Error on receiving command */
 146         LTTCOMM_CONSUMERD_POLL_ERROR,               /* Error in polling thread */
 147         LTTCOMM_CONSUMERD_POLL_NVAL,                /* Poll on closed fd */
 148         LTTCOMM_CONSUMERD_POLL_HUP,                 /* All fds have hungup */
 149         LTTCOMM_CONSUMERD_EXIT_SUCCESS,             /* Consumerd exiting normally */
 150         LTTCOMM_CONSUMERD_EXIT_FAILURE,             /* Consumerd exiting on error */
 151         LTTCOMM_CONSUMERD_OUTFD_ERROR,              /* Error opening the tracefile */
 152         LTTCOMM_CONSUMERD_SPLICE_EBADF,             /* EBADF from splice(2) */
 153         LTTCOMM_CONSUMERD_SPLICE_EINVAL,            /* EINVAL from splice(2) */
 154         LTTCOMM_CONSUMERD_SPLICE_ENOMEM,            /* ENOMEM from splice(2) */
 155         LTTCOMM_CONSUMERD_SPLICE_ESPIPE,            /* ESPIPE from splice(2) */
 156         LTTCOMM_CONSUMERD_ENOMEM,                   /* Consumer is out of memory */
 157         LTTCOMM_CONSUMERD_ERROR_METADATA,           /* Error with metadata. */
 158         LTTCOMM_CONSUMERD_FATAL,                    /* Fatal error. */
 159         LTTCOMM_CONSUMERD_RELAYD_FAIL,              /* Error on remote relayd */
 160         LTTCOMM_CONSUMERD_CHANNEL_FAIL,             /* Channel creation failed. */
 161         LTTCOMM_CONSUMERD_CHAN_NOT_FOUND,           /* Channel not found. */
 162         LTTCOMM_CONSUMERD_ALREADY_SET,              /* Resource already set. */
 163
 164         /* MUST be last element */
 165         LTTCOMM_NR,                                             /* Last element */
 166 };
 167
 168 /* lttng socket protocol. */
 169 enum lttcomm_sock_proto {
 170         LTTCOMM_SOCK_UDP,
 171         LTTCOMM_SOCK_TCP,
 172 };
 173
 174 /*
 175  * Index in the net_families array below. Please keep in sync!
 176  */
 177 enum lttcomm_sock_domain {
 178         LTTCOMM_INET      = 0,
 179         LTTCOMM_INET6     = 1,
 180 };
 181
 182 enum lttcomm_metadata_command {
 183         LTTCOMM_METADATA_REQUEST = 1,
 184 };
 185
 186 /*
 187  * Commands sent from the consumerd to the sessiond to request if new metadata
 188  * is available. This message is used to find the per UID _or_ per PID registry
 189  * for the channel key. For per UID lookup, the triplet
 190  * bits_per_long/uid/session_id is used. On lookup failure, we search for the
 191  * per PID registry indexed by session id ignoring the other values.
 192  */
 193 struct lttcomm_metadata_request_msg {
 194         uint64_t session_id; /* Tracing session id */
 195         uint64_t session_id_per_pid; /* Tracing session id for per-pid */
 196         uint32_t bits_per_long; /* Consumer ABI */
 197         uint32_t uid;
 198         uint64_t key; /* Metadata channel key. */
 199 } LTTNG_PACKED;
 200
 201 struct lttcomm_sockaddr {
 202         enum lttcomm_sock_domain type;
 203         union {
 204                 struct sockaddr_in sin;
 205                 struct sockaddr_in6 sin6;
 206         } addr;
 207 } LTTNG_PACKED;
 208
 209 struct lttcomm_sock {
 210         int32_t fd;
 211         enum lttcomm_sock_proto proto;
 212         struct lttcomm_sockaddr sockaddr;
 213         const struct lttcomm_proto_ops *ops;
 214 } LTTNG_PACKED;
 215
 216 /*
 217  * Relayd sock. Adds the protocol version to use for the communications with
 218  * the relayd.
 219  */
 220 struct lttcomm_relayd_sock {
 221         struct lttcomm_sock sock;
 222         uint32_t major;
 223         uint32_t minor;
 224 } LTTNG_PACKED;
 225
 226 struct lttcomm_net_family {
 227         int family;
 228         int (*create) (struct lttcomm_sock *sock, int type, int proto);
 229 };
 230
 231 struct lttcomm_proto_ops {
 232         int (*bind) (struct lttcomm_sock *sock);
 233         int (*close) (struct lttcomm_sock *sock);
 234         int (*connect) (struct lttcomm_sock *sock);
 235         struct lttcomm_sock *(*accept) (struct lttcomm_sock *sock);
 236         int (*listen) (struct lttcomm_sock *sock, int backlog);
 237         ssize_t (*recvmsg) (struct lttcomm_sock *sock, void *buf, size_t len,
 238                         int flags);
 239         ssize_t (*sendmsg) (struct lttcomm_sock *sock, const void *buf,
 240                         size_t len, int flags);
 241 };
 242
 243 /*
 244  * Data structure received from lttng client to session daemon.
 245  */
 246 struct lttcomm_session_msg {
 247         uint32_t cmd_type;      /* enum lttcomm_sessiond_command */
 248         struct lttng_session session;
 249         struct lttng_domain domain;
 250         union {
 251                 /* Event data */
 252                 struct {
 253                         char channel_name[LTTNG_SYMBOL_NAME_LEN];
 254                         struct lttng_event event LTTNG_PACKED;
 255                         /* Length of following filter expression. */
 256                         uint32_t expression_len;
 257                         /* Length of following bytecode for filter. */
 258                         uint32_t bytecode_len;
 259                         /* exclusion data */
 260                         uint32_t exclusion_count;
 261                         /*
 262                          * After this structure, the following variable-length
 263                          * items are transmitted:
 264                          * - char exclusion_names[LTTNG_SYMBOL_NAME_LEN][exclusion_count]
 265                          * - unsigned char filter_expression[expression_len]
 266                          * - unsigned char filter_bytecode[bytecode_len]
 267                          */
 268                 } LTTNG_PACKED enable;
 269                 struct {
 270                         char channel_name[LTTNG_SYMBOL_NAME_LEN];
 271                         struct lttng_event event LTTNG_PACKED;
 272                         /* Length of following filter expression. */
 273                         uint32_t expression_len;
 274                         /* Length of following bytecode for filter. */
 275                         uint32_t bytecode_len;
 276                         /*
 277                          * After this structure, the following variable-length
 278                          * items are transmitted:
 279                          * - unsigned char filter_expression[expression_len]
 280                          * - unsigned char filter_bytecode[bytecode_len]
 281                          */
 282                 } LTTNG_PACKED disable;
 283                 /* Create channel */
 284                 struct {
 285                         struct lttng_channel chan LTTNG_PACKED;
 286                         /* struct lttng_channel_extended is already packed. */
 287                         struct lttng_channel_extended extended;
 288                 } LTTNG_PACKED channel;
 289                 /* Context */
 290                 struct {
 291                         char channel_name[LTTNG_SYMBOL_NAME_LEN];
 292                         struct lttng_event_context ctx LTTNG_PACKED;
 293                         uint32_t provider_name_len;
 294                         uint32_t context_name_len;
 295                 } LTTNG_PACKED context;
 296                 /* Use by register_consumer */
 297                 struct {
 298                         char path[PATH_MAX];
 299                 } LTTNG_PACKED reg;
 300                 /* List */
 301                 struct {
 302                         char channel_name[LTTNG_SYMBOL_NAME_LEN];
 303                 } LTTNG_PACKED list;
 304                 struct lttng_calibrate calibrate;
 305                 /* Used by the set_consumer_url and used by create_session also call */
 306                 struct {
 307                         /* Number of lttng_uri following */
 308                         uint32_t size;
 309                 } LTTNG_PACKED uri;
 310                 struct {
 311                         struct lttng_snapshot_output output LTTNG_PACKED;
 312                 } LTTNG_PACKED snapshot_output;
 313                 struct {
 314                         uint32_t wait;
 315                         struct lttng_snapshot_output output LTTNG_PACKED;
 316                 } LTTNG_PACKED snapshot_record;
 317                 struct {
 318                         uint32_t nb_uri;
 319                         unsigned int timer_interval;    /* usec */
 320                 } LTTNG_PACKED session_live;
 321                 struct {
 322                         struct lttng_save_session_attr attr; /* struct already packed */
 323                 } LTTNG_PACKED save_session;
 324                 struct {
 325                         char shm_path[PATH_MAX];
 326                 } LTTNG_PACKED set_shm_path;
 327                 struct {
 328                         uint32_t pid;
 329                 } LTTNG_PACKED pid_tracker;
 330                 struct {
 331                         uint32_t length;
 332                 } LTTNG_PACKED trigger;
 333         } u;
 334 } LTTNG_PACKED;
 335
 336 #define LTTNG_FILTER_MAX_LEN    65536
 337
 338 /*
 339  * Filter bytecode data. The reloc table is located at the end of the
 340  * bytecode. It is made of tuples: (uint16_t, var. len. string). It
 341  * starts at reloc_table_offset.
 342  */
 343 #define LTTNG_FILTER_PADDING    32
 344 struct lttng_filter_bytecode {
 345         uint32_t len;   /* len of data */
 346         uint32_t reloc_table_offset;
 347         uint64_t seqnum;
 348         char padding[LTTNG_FILTER_PADDING];
 349         char data[0];
 350 } LTTNG_PACKED;
 351
 352 /*
 353  * Event exclusion data. At the end of the structure, there will actually
 354  * by zero or more names, where the actual number of names is given by
 355  * the 'count' item of the structure.
 356  */
 357 #define LTTNG_EVENT_EXCLUSION_PADDING   32
 358 struct lttng_event_exclusion {
 359         uint32_t count;
 360         char padding[LTTNG_EVENT_EXCLUSION_PADDING];
 361         char names[0][LTTNG_SYMBOL_NAME_LEN];
 362 } LTTNG_PACKED;
 363
 364 #define LTTNG_EVENT_EXCLUSION_NAME_AT(_exclusion, _i) \
 365         (&(_exclusion)->names[_i][0])
 366
 367 /*
 368  * Event command header.
 369  */
 370 struct lttcomm_event_command_header {
 371         /* Number of events */
 372         uint32_t nb_events;
 373 } LTTNG_PACKED;
 374
 375 /*
 376  * Event extended info header. This is the structure preceding each
 377  * extended info data.
 378  */
 379 struct lttcomm_event_extended_header {
 380         /*
 381          * Size of filter string immediately following this header.
 382          * This size includes the terminal null character.
 383          */
 384         uint32_t filter_len;
 385
 386         /*
 387          * Number of exclusion names, immediately following the filter
 388          * string. Each exclusion name has a fixed length of
 389          * LTTNG_SYMBOL_NAME_LEN bytes, including the terminal null
 390          * character.
 391          */
 392         uint32_t nb_exclusions;
 393 } LTTNG_PACKED;
 394
 395 /*
 396  * Data structure for the response from sessiond to the lttng client.
 397  */
 398 struct lttcomm_lttng_msg {
 399         uint32_t cmd_type;      /* enum lttcomm_sessiond_command */
 400         uint32_t ret_code;      /* enum lttcomm_return_code */
 401         uint32_t pid;           /* pid_t */
 402         uint32_t cmd_header_size;
 403         uint32_t data_size;
 404 } LTTNG_PACKED;
 405
 406 struct lttcomm_lttng_output_id {
 407         uint32_t id;
 408 } LTTNG_PACKED;
 409
 410 /*
 411  * lttcomm_consumer_msg is the message sent from sessiond to consumerd
 412  * to either add a channel, add a stream, update a stream, or stop
 413  * operation.
 414  */
 415 struct lttcomm_consumer_msg {
 416         uint32_t cmd_type;      /* enum consumerd_command */
 417         union {
 418                 struct {
 419                         uint64_t channel_key;
 420                         uint64_t session_id;
 421                         char pathname[PATH_MAX];
 422                         uint32_t uid;
 423                         uint32_t gid;
 424                         uint64_t relayd_id;
 425                         /* nb_init_streams is the number of streams open initially. */
 426                         uint32_t nb_init_streams;
 427                         char name[LTTNG_SYMBOL_NAME_LEN];
 428                         /* Use splice or mmap to consume this fd */
 429                         enum lttng_event_output output;
 430                         int type; /* Per cpu or metadata. */
 431                         uint64_t tracefile_size; /* bytes */
 432                         uint32_t tracefile_count; /* number of tracefiles */
 433                         /* If the channel's streams have to be monitored or not. */
 434                         uint32_t monitor;
 435                         /* timer to check the streams usage in live mode (usec). */
 436                         unsigned int live_timer_interval;
 437                         /* timer to sample a channel's positions (usec). */
 438                         unsigned int monitor_timer_interval;
 439                 } LTTNG_PACKED channel; /* Only used by Kernel. */
 440                 struct {
 441                         uint64_t stream_key;
 442                         uint64_t channel_key;
 443                         int32_t cpu;    /* On which CPU this stream is assigned. */
 444                         /* Tells the consumer if the stream should be or not monitored. */
 445                         uint32_t no_monitor;
 446                 } LTTNG_PACKED stream;  /* Only used by Kernel. */
 447                 struct {
 448                         uint64_t net_index;
 449                         enum lttng_stream_type type;
 450                         /* Open socket to the relayd */
 451                         struct lttcomm_relayd_sock sock;
 452                         /* Tracing session id associated to the relayd. */
 453                         uint64_t session_id;
 454                         /* Relayd session id, only used with control socket. */
 455                         uint64_t relayd_session_id;
 456                 } LTTNG_PACKED relayd_sock;
 457                 struct {
 458                         uint64_t net_seq_idx;
 459                 } LTTNG_PACKED destroy_relayd;
 460                 struct {
 461                         uint64_t session_id;
 462                 } LTTNG_PACKED data_pending;
 463                 struct {
 464                         uint64_t subbuf_size;                   /* bytes */
 465                         uint64_t num_subbuf;                    /* power of 2 */
 466                         int32_t overwrite;                      /* 1: overwrite, 0: discard */
 467                         uint32_t switch_timer_interval;         /* usec */
 468                         uint32_t read_timer_interval;           /* usec */
 469                         unsigned int live_timer_interval;       /* usec */
 470                         uint32_t monitor_timer_interval;        /* usec */
 471                         int32_t output;                         /* splice, mmap */
 472                         int32_t type;                           /* metadata or per_cpu */
 473                         uint64_t session_id;                    /* Tracing session id */
 474                         char pathname[PATH_MAX];                /* Channel file path. */
 475                         char name[LTTNG_SYMBOL_NAME_LEN];       /* Channel name. */
 476                         uint32_t uid;                           /* User ID of the session */
 477                         uint32_t gid;                           /* Group ID ot the session */
 478                         uint64_t relayd_id;                     /* Relayd id if apply. */
 479                         uint64_t key;                           /* Unique channel key. */
 480                         unsigned char uuid[UUID_LEN];   /* uuid for ust tracer. */
 481                         uint32_t chan_id;                       /* Channel ID on the tracer side. */
 482                         uint64_t tracefile_size;        /* bytes */
 483                         uint32_t tracefile_count;       /* number of tracefiles */
 484                         uint64_t session_id_per_pid;    /* Per-pid session ID. */
 485                         /* Tells the consumer if the stream should be or not monitored. */
 486                         uint32_t monitor;
 487                         /*
 488                          * For UST per UID buffers, this is the application UID of the
 489                          * channel.  This can be different from the user UID requesting the
 490                          * channel creation and used for the rights on the stream file
 491                          * because the application can be in the tracing for instance.
 492                          */
 493                         uint32_t ust_app_uid;
 494                         int64_t blocking_timeout;
 495                         char root_shm_path[PATH_MAX];
 496                         char shm_path[PATH_MAX];
 497                 } LTTNG_PACKED ask_channel;
 498                 struct {
 499                         uint64_t key;
 500                 } LTTNG_PACKED get_channel;
 501                 struct {
 502                         uint64_t key;
 503                 } LTTNG_PACKED destroy_channel;
 504                 struct {
 505                         uint64_t key;   /* Metadata channel key. */
 506                         uint64_t target_offset; /* Offset in the consumer */
 507                         uint64_t len;   /* Length of metadata to be received. */
 508                         uint64_t version; /* Version of the metadata. */
 509                 } LTTNG_PACKED push_metadata;
 510                 struct {
 511                         uint64_t key;   /* Metadata channel key. */
 512                 } LTTNG_PACKED close_metadata;
 513                 struct {
 514                         uint64_t key;   /* Metadata channel key. */
 515                 } LTTNG_PACKED setup_metadata;
 516                 struct {
 517                         uint64_t key;   /* Channel key. */
 518                 } LTTNG_PACKED flush_channel;
 519                 struct {
 520                         uint64_t key;   /* Channel key. */
 521                 } LTTNG_PACKED clear_quiescent_channel;
 522                 struct {
 523                         char pathname[PATH_MAX];
 524                         /* Indicate if the snapshot goes on the relayd or locally. */
 525                         uint32_t use_relayd;
 526                         uint32_t metadata;              /* This a metadata snapshot. */
 527                         uint64_t relayd_id;             /* Relayd id if apply. */
 528                         uint64_t key;
 529                         uint64_t nb_packets_per_stream;
 530                 } LTTNG_PACKED snapshot_channel;
 531                 struct {
 532                         uint64_t channel_key;
 533                         uint64_t net_seq_idx;
 534                 } LTTNG_PACKED sent_streams;
 535                 struct {
 536                         uint64_t session_id;
 537                         uint64_t channel_key;
 538                 } LTTNG_PACKED discarded_events;
 539                 struct {
 540                         uint64_t session_id;
 541                         uint64_t channel_key;
 542                 } LTTNG_PACKED lost_packets;
 543                 struct {
 544                         uint64_t session_id;
 545                 } LTTNG_PACKED regenerate_metadata;
 546                 struct {
 547                         char pathname[PATH_MAX];
 548                         uint32_t metadata; /* This is a metadata channel. */
 549                         uint64_t relayd_id; /* Relayd id if apply. */
 550                         uint64_t key;
 551                         uint64_t new_chunk_id;
 552                 } LTTNG_PACKED rotate_channel;
 553                 struct {
 554                         char old_path[LTTNG_PATH_MAX];
 555                         char new_path[LTTNG_PATH_MAX];
 556                         uint64_t relayd_id; /* Relayd id if apply. */
 557                         uint64_t session_id;
 558                         uint32_t uid;
 559                         uint32_t gid;
 560                 } LTTNG_PACKED rotate_rename;
 561                 struct {
 562                         char path[LTTNG_PATH_MAX];
 563                         uint64_t relayd_id; /* Relayd id if apply. */
 564                         uint64_t session_id;
 565                         uint32_t uid;
 566                         uint32_t gid;
 567                 } LTTNG_PACKED mkdir;
 568         } u;
 569 } LTTNG_PACKED;
 570
 571 /*
 572  * Channel monitoring message returned to the session daemon on every
 573  * monitor timer expiration.
 574  */
 575 struct lttcomm_consumer_channel_monitor_msg {
 576         /* Key of the sampled channel. */
 577         uint64_t key;
 578         /*
 579          * Lowest and highest usage (bytes) at the moment the sample was taken.
 580          */
 581         uint64_t lowest, highest;
 582 } LTTNG_PACKED;
 583
 584 /*
 585  * Status message returned to the sessiond after a received command.
 586  */
 587 struct lttcomm_consumer_status_msg {
 588         enum lttcomm_return_code ret_code;
 589 } LTTNG_PACKED;
 590
 591 struct lttcomm_consumer_status_channel {
 592         enum lttcomm_return_code ret_code;
 593         uint64_t key;
 594         unsigned int stream_count;
 595 } LTTNG_PACKED;
 596
 597 #ifdef HAVE_LIBLTTNG_UST_CTL
 598
 599 #include <lttng/ust-abi.h>
 600
 601 /*
 602  * Data structure for the commands sent from sessiond to UST.
 603  */
 604 struct lttcomm_ust_msg {
 605         uint32_t handle;
 606         uint32_t cmd;
 607         union {
 608                 struct lttng_ust_channel channel;
 609                 struct lttng_ust_stream stream;
 610                 struct lttng_ust_event event;
 611                 struct lttng_ust_context context;
 612                 struct lttng_ust_tracer_version version;
 613         } u;
 614 } LTTNG_PACKED;
 615
 616 /*
 617  * Data structure for the response from UST to the session daemon.
 618  * cmd_type is sent back in the reply for validation.
 619  */
 620 struct lttcomm_ust_reply {
 621         uint32_t handle;
 622         uint32_t cmd;
 623         uint32_t ret_code;      /* enum lttcomm_return_code */
 624         uint32_t ret_val;       /* return value */
 625         union {
 626                 struct {
 627                         uint64_t memory_map_size;
 628                 } LTTNG_PACKED channel;
 629                 struct {
 630                         uint64_t memory_map_size;
 631                 } LTTNG_PACKED stream;
 632                 struct lttng_ust_tracer_version version;
 633         } u;
 634 } LTTNG_PACKED;
 635
 636 #endif /* HAVE_LIBLTTNG_UST_CTL */
 637
 638 extern const char *lttcomm_get_readable_code(enum lttcomm_return_code code);
 639
 640 extern int lttcomm_init_inet_sockaddr(struct lttcomm_sockaddr *sockaddr,
 641                 const char *ip, unsigned int port);
 642 extern int lttcomm_init_inet6_sockaddr(struct lttcomm_sockaddr *sockaddr,
 643                 const char *ip, unsigned int port);
 644
 645 extern struct lttcomm_sock *lttcomm_alloc_sock(enum lttcomm_sock_proto proto);
 646 extern int lttcomm_create_sock(struct lttcomm_sock *sock);
 647 extern struct lttcomm_sock *lttcomm_alloc_sock_from_uri(struct lttng_uri *uri);
 648 extern void lttcomm_destroy_sock(struct lttcomm_sock *sock);
 649 extern struct lttcomm_sock *lttcomm_alloc_copy_sock(struct lttcomm_sock *src);
 650 extern void lttcomm_copy_sock(struct lttcomm_sock *dst,
 651                 struct lttcomm_sock *src);
 652
 653 /* Relayd socket object. */
 654 extern struct lttcomm_relayd_sock *lttcomm_alloc_relayd_sock(
 655                 struct lttng_uri *uri, uint32_t major, uint32_t minor);
 656
 657 extern int lttcomm_setsockopt_rcv_timeout(int sock, unsigned int msec);
 658 extern int lttcomm_setsockopt_snd_timeout(int sock, unsigned int msec);
 659
 660 extern void lttcomm_init(void);
 661 /* Get network timeout, in milliseconds */
 662 extern unsigned long lttcomm_get_network_timeout(void);
 663
 664 #endif  /* _LTTNG_SESSIOND_COMM_H */