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