src/bin/lttng-sessiond/ust-app.h

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2 only,
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #ifndef _LTT_UST_APP_H
  20 #define _LTT_UST_APP_H
  21
  22 #include <stdint.h>
  23
  24 #include <common/uuid.h>
  25
  26 #include "trace-ust.h"
  27 #include "ust-registry.h"
  28 #include "session.h"
  29
  30 #define UST_APP_EVENT_LIST_SIZE 32
  31
  32 /* Process name (short). */
  33 #define UST_APP_PROCNAME_LEN    16
  34
  35 struct lttng_filter_bytecode;
  36 struct lttng_ust_filter_bytecode;
  37
  38 extern int ust_consumerd64_fd, ust_consumerd32_fd;
  39
  40 /*
  41  * Object used to close the notify socket in a call_rcu(). Since the
  42  * application might not be found, we need an independant object containing the
  43  * notify socket fd.
  44  */
  45 struct ust_app_notify_sock_obj {
  46         int fd;
  47         struct rcu_head head;
  48 };
  49
  50 struct ust_app_ht_key {
  51         const char *name;
  52         const struct lttng_filter_bytecode *filter;
  53         enum lttng_ust_loglevel_type loglevel_type;
  54         const struct lttng_event_exclusion *exclusion;
  55 };
  56
  57 /*
  58  * Application registration data structure.
  59  */
  60 struct ust_register_msg {
  61         enum ustctl_socket_type type;
  62         uint32_t major;
  63         uint32_t minor;
  64         uint32_t abi_major;
  65         uint32_t abi_minor;
  66         pid_t pid;
  67         pid_t ppid;
  68         uid_t uid;
  69         gid_t gid;
  70         uint32_t bits_per_long;
  71         uint32_t uint8_t_alignment;
  72         uint32_t uint16_t_alignment;
  73         uint32_t uint32_t_alignment;
  74         uint32_t uint64_t_alignment;
  75         uint32_t long_alignment;
  76         int byte_order;         /* BIG_ENDIAN or LITTLE_ENDIAN */
  77         char name[LTTNG_UST_ABI_PROCNAME_LEN];
  78 };
  79
  80 /*
  81  * Global applications HT used by the session daemon. This table is indexed by
  82  * PID using the pid_n node and pid value of an ust_app.
  83  */
  84 struct lttng_ht *ust_app_ht;
  85
  86 /*
  87  * Global applications HT used by the session daemon. This table is indexed by
  88  * socket using the sock_n node and sock value of an ust_app.
  89  *
  90  * The 'sock' in question here is the 'command' socket.
  91  */
  92 struct lttng_ht *ust_app_ht_by_sock;
  93
  94 /*
  95  * Global applications HT used by the session daemon. This table is indexed by
  96  * socket using the notify_sock_n node and notify_sock value of an ust_app.
  97  */
  98 struct lttng_ht *ust_app_ht_by_notify_sock;
  99
 100 /* Stream list containing ust_app_stream. */
 101 struct ust_app_stream_list {
 102         unsigned int count;
 103         struct cds_list_head head;
 104 };
 105
 106 struct ust_app_ctx {
 107         int handle;
 108         struct lttng_ust_context_attr ctx;
 109         struct lttng_ust_object_data *obj;
 110         struct lttng_ht_node_ulong node;
 111         struct cds_list_head list;
 112 };
 113
 114 struct ust_app_event {
 115         int enabled;
 116         int handle;
 117         struct lttng_ust_object_data *obj;
 118         struct lttng_ust_event attr;
 119         char name[LTTNG_UST_SYM_NAME_LEN];
 120         struct lttng_ht_node_str node;
 121         struct lttng_filter_bytecode *filter;
 122         struct lttng_event_exclusion *exclusion;
 123 };
 124
 125 struct ust_app_stream {
 126         int handle;
 127         char pathname[PATH_MAX];
 128         /* Format is %s_%d respectively channel name and CPU number. */
 129         char name[DEFAULT_STREAM_NAME_LEN];
 130         struct lttng_ust_object_data *obj;
 131         /* Using a list of streams to keep order. */
 132         struct cds_list_head list;
 133 };
 134
 135 struct ust_app_channel {
 136         int enabled;
 137         int handle;
 138         /* Channel and streams were sent to the UST tracer. */
 139         int is_sent;
 140         /*
 141          * Unique key used to identify the channel on the consumer side.
 142          * 0 is a reserved 'invalid' value used to indicate that the consumer
 143          * does not know about this channel (i.e. an error occurred).
 144          */
 145         uint64_t key;
 146         /* Id of the tracing channel set on creation. */
 147         uint64_t tracing_channel_id;
 148         /* Number of stream that this channel is expected to receive. */
 149         unsigned int expected_stream_count;
 150         char name[LTTNG_UST_SYM_NAME_LEN];
 151         struct lttng_ust_object_data *obj;
 152         struct ustctl_consumer_channel_attr attr;
 153         struct ust_app_stream_list streams;
 154         /* Session pointer that owns this object. */
 155         struct ust_app_session *session;
 156         /*
 157          * Contexts are kept in a hash table for fast lookup and in an ordered list
 158          * so we are able to enable them on the tracer side in the same order the
 159          * user added them.
 160          */
 161         struct lttng_ht *ctx;
 162         struct cds_list_head ctx_list;
 163
 164         struct lttng_ht *events;
 165         uint64_t tracefile_size;
 166         uint64_t tracefile_count;
 167         uint64_t monitor_timer_interval;
 168         /*
 169          * Node indexed by channel name in the channels' hash table of a session.
 170          */
 171         struct lttng_ht_node_str node;
 172         /*
 173          * Node indexed by UST channel object descriptor (handle). Stored in the
 174          * ust_objd hash table in the ust_app object.
 175          */
 176         struct lttng_ht_node_ulong ust_objd_node;
 177         /* For delayed reclaim */
 178         struct rcu_head rcu_head;
 179 };
 180
 181 struct ust_app_session {
 182         /*
 183          * Lock protecting this session's ust app interaction. Held
 184          * across command send/recv to/from app. Never nests within the
 185          * session registry lock.
 186          */
 187         pthread_mutex_t lock;
 188
 189         int enabled;
 190         /* started: has the session been in started state at any time ? */
 191         int started;  /* allows detection of start vs restart. */
 192         int handle;   /* used has unique identifier for app session */
 193
 194         bool deleted;   /* Session deleted flag. Check with lock held. */
 195
 196         /*
 197          * Tracing session ID. Multiple ust app session can have the same tracing
 198          * session id making this value NOT unique to the object.
 199          */
 200         uint64_t tracing_id;
 201         uint64_t id;    /* Unique session identifier */
 202         struct lttng_ht *channels; /* Registered channels */
 203         struct lttng_ht_node_u64 node;
 204         /*
 205          * Node indexed by UST session object descriptor (handle). Stored in the
 206          * ust_sessions_objd hash table in the ust_app object.
 207          */
 208         struct lttng_ht_node_ulong ust_objd_node;
 209         /* Starts with 'ust'; no leading slash. */
 210         char path[PATH_MAX];
 211         /* UID/GID of the application owning the session */
 212         struct lttng_credentials real_credentials;
 213         /* Effective UID and GID. Same as the tracing session. */
 214         struct lttng_credentials effective_credentials;
 215         struct cds_list_head teardown_node;
 216         /*
 217          * Once at least *one* session is created onto the application, the
 218          * corresponding consumer is set so we can use it on unregistration.
 219          */
 220         struct consumer_output *consumer;
 221         enum lttng_buffer_type buffer_type;
 222         /* ABI of the session. Same value as the application. */
 223         uint32_t bits_per_long;
 224         /* For delayed reclaim */
 225         struct rcu_head rcu_head;
 226         /* If the channel's streams have to be outputed or not. */
 227         unsigned int output_traces;
 228         unsigned int live_timer_interval;       /* usec */
 229
 230         /* Metadata channel attributes. */
 231         struct ustctl_consumer_channel_attr metadata_attr;
 232
 233         char root_shm_path[PATH_MAX];
 234         char shm_path[PATH_MAX];
 235 };
 236
 237 /*
 238  * Registered traceable applications. Libust registers to the session daemon
 239  * and a linked list is kept of all running traceable app.
 240  */
 241 struct ust_app {
 242         int sock;
 243         pthread_mutex_t sock_lock;      /* Protects sock protocol. */
 244
 245         int notify_sock;
 246         pid_t pid;
 247         pid_t ppid;
 248         uid_t uid;           /* User ID that owns the apps */
 249         gid_t gid;           /* Group ID that owns the apps */
 250
 251         /* App ABI */
 252         uint32_t bits_per_long;
 253         uint32_t uint8_t_alignment;
 254         uint32_t uint16_t_alignment;
 255         uint32_t uint32_t_alignment;
 256         uint32_t uint64_t_alignment;
 257         uint32_t long_alignment;
 258         int byte_order;         /* BIG_ENDIAN or LITTLE_ENDIAN */
 259
 260         int compatible; /* If the lttng-ust tracer version does not match the
 261                                            supported version of the session daemon, this flag is
 262                                            set to 0 (NOT compatible) else 1. */
 263         struct lttng_ust_tracer_version version;
 264         uint32_t v_major;    /* Version major number */
 265         uint32_t v_minor;    /* Version minor number */
 266         /* Extra for the NULL byte. */
 267         char name[UST_APP_PROCNAME_LEN + 1];
 268         /* Type of buffer this application uses. */
 269         enum lttng_buffer_type buffer_type;
 270         struct lttng_ht *sessions;
 271         struct lttng_ht_node_ulong pid_n;
 272         struct lttng_ht_node_ulong sock_n;
 273         struct lttng_ht_node_ulong notify_sock_n;
 274         /*
 275          * This is a list of ust app session that, once the app is going into
 276          * teardown mode, in the RCU call, each node in this list is removed and
 277          * deleted.
 278          *
 279          * Element of the list are added when an application unregisters after each
 280          * ht_del of ust_app_session associated to this app. This list is NOT used
 281          * when a session is destroyed.
 282          */
 283         struct cds_list_head teardown_head;
 284         /*
 285          * Hash table containing ust_app_channel indexed by channel objd.
 286          */
 287         struct lttng_ht *ust_objd;
 288         /*
 289          * Hash table containing ust_app_session indexed by objd.
 290          */
 291         struct lttng_ht *ust_sessions_objd;
 292
 293         /*
 294          * If this application is of the agent domain and this is non negative then
 295          * a lookup MUST be done to acquire a read side reference to the
 296          * corresponding agent app object. If the lookup fails, this should be set
 297          * to a negative value indicating that the agent application is gone.
 298          */
 299         int agent_app_sock;
 300         /*
 301          * Time at which the app is registred.
 302          * Used for path creation
 303          */
 304         time_t registration_time;
 305 };
 306
 307 #ifdef HAVE_LIBLTTNG_UST_CTL
 308
 309 int ust_app_register(struct ust_register_msg *msg, int sock);
 310 int ust_app_register_done(struct ust_app *app);
 311 int ust_app_version(struct ust_app *app);
 312 void ust_app_unregister(int sock);
 313 int ust_app_start_trace_all(struct ltt_ust_session *usess);
 314 int ust_app_stop_trace_all(struct ltt_ust_session *usess);
 315 int ust_app_destroy_trace_all(struct ltt_ust_session *usess);
 316 int ust_app_list_events(struct lttng_event **events);
 317 int ust_app_list_event_fields(struct lttng_event_field **fields);
 318 int ust_app_create_event_glb(struct ltt_ust_session *usess,
 319                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
 320 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
 321                 struct ltt_ust_channel *uchan);
 322 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
 323                 struct ltt_ust_channel *uchan);
 324 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
 325                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
 326 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
 327                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
 328 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
 329                 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx);
 330 void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app);
 331 void ust_app_global_update_all(struct ltt_ust_session *usess);
 332
 333 void ust_app_clean_list(void);
 334 int ust_app_ht_alloc(void);
 335 struct ust_app *ust_app_find_by_pid(pid_t pid);
 336 struct ust_app_stream *ust_app_alloc_stream(void);
 337 int ust_app_recv_registration(int sock, struct ust_register_msg *msg);
 338 int ust_app_recv_notify(int sock);
 339 void ust_app_add(struct ust_app *app);
 340 struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock);
 341 void ust_app_notify_sock_unregister(int sock);
 342 ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
 343                 struct consumer_socket *socket, int send_zero_data);
 344 void ust_app_destroy(struct ust_app *app);
 345 enum lttng_error_code ust_app_snapshot_record(
 346                 const struct ltt_ust_session *usess,
 347                 const struct consumer_output *output, int wait,
 348                 uint64_t nb_packets_per_stream);
 349 uint64_t ust_app_get_size_one_more_packet_per_stream(
 350                 const struct ltt_ust_session *usess, uint64_t cur_nr_packets);
 351 struct ust_app *ust_app_find_by_sock(int sock);
 352 int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
 353                 struct cds_list_head *buffer_reg_uid_list,
 354                 struct consumer_output *consumer, uint64_t uchan_id,
 355                 int overwrite, uint64_t *discarded, uint64_t *lost);
 356 int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
 357                 struct ltt_ust_channel *uchan,
 358                 struct consumer_output *consumer,
 359                 int overwrite, uint64_t *discarded, uint64_t *lost);
 360 int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess);
 361 enum lttng_error_code ust_app_rotate_session(struct ltt_session *session);
 362 enum lttng_error_code ust_app_create_channel_subdirectories(
 363                 const struct ltt_ust_session *session);
 364 int ust_app_release_object(struct ust_app *app,
 365                 struct lttng_ust_object_data *data);
 366 enum lttng_error_code ust_app_clear_session(struct ltt_session *session);
 367
 368 static inline
 369 int ust_app_supported(void)
 370 {
 371         return 1;
 372 }
 373
 374 #else /* HAVE_LIBLTTNG_UST_CTL */
 375
 376 static inline
 377 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
 378 {
 379         return 0;
 380 }
 381 static inline
 382 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
 383 {
 384         return 0;
 385 }
 386 static inline
 387 int ust_app_start_trace_all(struct ltt_ust_session *usess)
 388 {
 389         return 0;
 390 }
 391 static inline
 392 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
 393 {
 394         return 0;
 395 }
 396 static inline
 397 int ust_app_list_events(struct lttng_event **events)
 398 {
 399         return -ENOSYS;
 400 }
 401 static inline
 402 int ust_app_list_event_fields(struct lttng_event_field **fields)
 403 {
 404         return -ENOSYS;
 405 }
 406 static inline
 407 int ust_app_register(struct ust_register_msg *msg, int sock)
 408 {
 409         return -ENOSYS;
 410 }
 411 static inline
 412 int ust_app_register_done(struct ust_app *app)
 413 {
 414         return -ENOSYS;
 415 }
 416 static inline
 417 int ust_app_version(struct ust_app *app)
 418 {
 419         return -ENOSYS;
 420 }
 421 static inline
 422 void ust_app_unregister(int sock)
 423 {
 424 }
 425 static inline
 426 void ust_app_lock_list(void)
 427 {
 428 }
 429 static inline
 430 void ust_app_unlock_list(void)
 431 {
 432 }
 433 static inline
 434 void ust_app_clean_list(void)
 435 {
 436 }
 437 static inline
 438 struct ust_app_list *ust_app_get_list(void)
 439 {
 440         return NULL;
 441 }
 442 static inline
 443 struct ust_app *ust_app_get_by_pid(pid_t pid)
 444 {
 445         return NULL;
 446 }
 447 static inline
 448 int ust_app_ht_alloc(void)
 449 {
 450         return 0;
 451 }
 452 static inline
 453 void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app)
 454 {}
 455 static inline
 456 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
 457                 struct ltt_ust_channel *uchan)
 458 {
 459         return 0;
 460 }
 461 static inline
 462 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
 463                 struct ltt_ust_channel *uchan)
 464 {
 465         return 0;
 466 }
 467 static inline
 468 int ust_app_create_event_glb(struct ltt_ust_session *usess,
 469                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
 470 {
 471         return 0;
 472 }
 473 static inline
 474 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
 475                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
 476 {
 477         return 0;
 478 }
 479 static inline
 480 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
 481                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
 482 {
 483         return 0;
 484 }
 485 static inline
 486 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
 487                 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
 488 {
 489         return 0;
 490 }
 491 static inline
 492 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
 493                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
 494                 pid_t pid)
 495 {
 496         return 0;
 497 }
 498 static inline
 499 int ust_app_recv_registration(int sock, struct ust_register_msg *msg)
 500 {
 501         return 0;
 502 }
 503 static inline
 504 int ust_app_recv_notify(int sock)
 505 {
 506         return 0;
 507 }
 508 static inline
 509 struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock)
 510 {
 511         return NULL;
 512 }
 513 static inline
 514 void ust_app_add(struct ust_app *app)
 515 {
 516 }
 517 static inline
 518 void ust_app_notify_sock_unregister(int sock)
 519 {
 520 }
 521 static inline
 522 ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
 523                 struct consumer_socket *socket, int send_zero_data)
 524 {
 525         return 0;
 526 }
 527 static inline
 528 void ust_app_destroy(struct ust_app *app)
 529 {
 530         return;
 531 }
 532 static inline
 533 enum lttng_error_code ust_app_snapshot_record(struct ltt_ust_session *usess,
 534                 const struct consumer_output *output, int wait, uint64_t max_stream_size)
 535 {
 536         return 0;
 537 }
 538 static inline
 539 unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess)
 540 {
 541         return 0;
 542 }
 543
 544 static inline
 545 int ust_app_supported(void)
 546 {
 547         return 0;
 548 }
 549 static inline
 550 struct ust_app *ust_app_find_by_sock(int sock)
 551 {
 552         return NULL;
 553 }
 554 static inline
 555 struct ust_app *ust_app_find_by_pid(pid_t pid)
 556 {
 557         return NULL;
 558 }
 559 static inline
 560 uint64_t ust_app_get_size_one_more_packet_per_stream(
 561                 const struct ltt_ust_session *usess, uint64_t cur_nr_packets) {
 562         return 0;
 563 }
 564 static inline
 565 int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
 566                 struct cds_list_head *buffer_reg_uid_list,
 567                 struct consumer_output *consumer, int overwrite,
 568                 uint64_t uchan_id, uint64_t *discarded, uint64_t *lost)
 569 {
 570         return 0;
 571 }
 572
 573 static inline
 574 int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
 575                 struct ltt_ust_channel *uchan,
 576                 struct consumer_output *consumer,
 577                 int overwrite, uint64_t *discarded, uint64_t *lost)
 578 {
 579         return 0;
 580 }
 581
 582 static inline
 583 int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess)
 584 {
 585         return 0;
 586 }
 587
 588 static inline
 589 enum lttng_error_code ust_app_rotate_session(struct ltt_session *session)
 590 {
 591         return 0;
 592 }
 593
 594 static inline
 595 enum lttng_error_code ust_app_create_channel_subdirectories(
 596                 const struct ltt_ust_session *session)
 597 {
 598         return 0;
 599 }
 600
 601 static inline
 602 int ust_app_release_object(struct ust_app *app, struct lttng_ust_object_data *data)
 603 {
 604         return 0;
 605 }
 606
 607 static inline
 608 enum lttng_error_code ust_app_clear_session(struct ltt_session *session)
 609 {
 610         return 0;
 611 }
 612
 613 #endif /* HAVE_LIBLTTNG_UST_CTL */
 614
 615 #endif /* _LTT_UST_APP_H */