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