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 #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         char path[PATH_MAX];
 210         /* UID/GID of the application owning the session */
 211         uid_t uid;
 212         gid_t gid;
 213         /* Effective UID and GID. Same as the tracing session. */
 214         uid_t euid;
 215         gid_t egid;
 216         struct cds_list_head teardown_node;
 217         /*
 218          * Once at least *one* session is created onto the application, the
 219          * corresponding consumer is set so we can use it on unregistration.
 220          */
 221         struct consumer_output *consumer;
 222         enum lttng_buffer_type buffer_type;
 223         /* ABI of the session. Same value as the application. */
 224         uint32_t bits_per_long;
 225         /* For delayed reclaim */
 226         struct rcu_head rcu_head;
 227         /* If the channel's streams have to be outputed or not. */
 228         unsigned int output_traces;
 229         unsigned int live_timer_interval;       /* usec */
 230
 231         /* Metadata channel attributes. */
 232         struct ustctl_consumer_channel_attr metadata_attr;
 233
 234         char root_shm_path[PATH_MAX];
 235         char shm_path[PATH_MAX];
 236 };
 237
 238 /*
 239  * Registered traceable applications. Libust registers to the session daemon
 240  * and a linked list is kept of all running traceable app.
 241  */
 242 struct ust_app {
 243         int sock;
 244         pthread_mutex_t sock_lock;      /* Protects sock protocol. */
 245
 246         int notify_sock;
 247         pid_t pid;
 248         pid_t ppid;
 249         uid_t uid;           /* User ID that owns the apps */
 250         gid_t gid;           /* Group ID that owns the apps */
 251
 252         /* App ABI */
 253         uint32_t bits_per_long;
 254         uint32_t uint8_t_alignment;
 255         uint32_t uint16_t_alignment;
 256         uint32_t uint32_t_alignment;
 257         uint32_t uint64_t_alignment;
 258         uint32_t long_alignment;
 259         int byte_order;         /* BIG_ENDIAN or LITTLE_ENDIAN */
 260
 261         int compatible; /* If the lttng-ust tracer version does not match the
 262                                            supported version of the session daemon, this flag is
 263                                            set to 0 (NOT compatible) else 1. */
 264         struct lttng_ust_tracer_version version;
 265         uint32_t v_major;    /* Version major number */
 266         uint32_t v_minor;    /* Version minor number */
 267         /* Extra for the NULL byte. */
 268         char name[UST_APP_PROCNAME_LEN + 1];
 269         /* Type of buffer this application uses. */
 270         enum lttng_buffer_type buffer_type;
 271         struct lttng_ht *sessions;
 272         struct lttng_ht_node_ulong pid_n;
 273         struct lttng_ht_node_ulong sock_n;
 274         struct lttng_ht_node_ulong notify_sock_n;
 275         /*
 276          * This is a list of ust app session that, once the app is going into
 277          * teardown mode, in the RCU call, each node in this list is removed and
 278          * deleted.
 279          *
 280          * Element of the list are added when an application unregisters after each
 281          * ht_del of ust_app_session associated to this app. This list is NOT used
 282          * when a session is destroyed.
 283          */
 284         struct cds_list_head teardown_head;
 285         /*
 286          * Hash table containing ust_app_channel indexed by channel objd.
 287          */
 288         struct lttng_ht *ust_objd;
 289         /*
 290          * Hash table containing ust_app_session indexed by objd.
 291          */
 292         struct lttng_ht *ust_sessions_objd;
 293
 294         /*
 295          * If this application is of the agent domain and this is non negative then
 296          * a lookup MUST be done to acquire a read side reference to the
 297          * corresponding agent app object. If the lookup fails, this should be set
 298          * to a negative value indicating that the agent application is gone.
 299          */
 300         int agent_app_sock;
 301 };
 302
 303 #ifdef HAVE_LIBLTTNG_UST_CTL
 304
 305 int ust_app_register(struct ust_register_msg *msg, int sock);
 306 int ust_app_register_done(struct ust_app *app);
 307 int ust_app_version(struct ust_app *app);
 308 void ust_app_unregister(int sock);
 309 int ust_app_start_trace_all(struct ltt_ust_session *usess);
 310 int ust_app_stop_trace_all(struct ltt_ust_session *usess);
 311 int ust_app_destroy_trace_all(struct ltt_ust_session *usess);
 312 int ust_app_list_events(struct lttng_event **events);
 313 int ust_app_list_event_fields(struct lttng_event_field **fields);
 314 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
 315                 struct ltt_ust_channel *uchan);
 316 int ust_app_create_event_glb(struct ltt_ust_session *usess,
 317                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
 318 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
 319                 struct ltt_ust_channel *uchan);
 320 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
 321                 struct ltt_ust_channel *uchan);
 322 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
 323                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
 324 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
 325                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent);
 326 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
 327                 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx);
 328 void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app);
 329 void ust_app_global_update_all(struct ltt_ust_session *usess);
 330
 331 void ust_app_clean_list(void);
 332 int ust_app_ht_alloc(void);
 333 struct ust_app *ust_app_find_by_pid(pid_t pid);
 334 struct ust_app_stream *ust_app_alloc_stream(void);
 335 int ust_app_recv_registration(int sock, struct ust_register_msg *msg);
 336 int ust_app_recv_notify(int sock);
 337 void ust_app_add(struct ust_app *app);
 338 struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock);
 339 void ust_app_notify_sock_unregister(int sock);
 340 ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
 341                 struct consumer_socket *socket, int send_zero_data);
 342 void ust_app_destroy(struct ust_app *app);
 343 enum lttng_error_code ust_app_snapshot_record(
 344                 const struct ltt_ust_session *usess,
 345                 const struct snapshot_output *output, int wait,
 346                 uint64_t nb_packets_per_stream);
 347 uint64_t ust_app_get_size_one_more_packet_per_stream(
 348                 const struct ltt_ust_session *usess, uint64_t cur_nr_packets);
 349 struct ust_app *ust_app_find_by_sock(int sock);
 350 int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
 351                 struct cds_list_head *buffer_reg_uid_list,
 352                 struct consumer_output *consumer, uint64_t uchan_id,
 353                 int overwrite, uint64_t *discarded, uint64_t *lost);
 354 int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
 355                 struct ltt_ust_channel *uchan,
 356                 struct consumer_output *consumer,
 357                 int overwrite, uint64_t *discarded, uint64_t *lost);
 358 int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess);
 359 enum lttng_error_code ust_app_rotate_session(struct ltt_session *session);
 360
 361 static inline
 362 int ust_app_supported(void)
 363 {
 364         return 1;
 365 }
 366
 367 #else /* HAVE_LIBLTTNG_UST_CTL */
 368
 369 static inline
 370 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
 371 {
 372         return 0;
 373 }
 374 static inline
 375 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
 376 {
 377         return 0;
 378 }
 379 static inline
 380 int ust_app_start_trace_all(struct ltt_ust_session *usess)
 381 {
 382         return 0;
 383 }
 384 static inline
 385 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
 386 {
 387         return 0;
 388 }
 389 static inline
 390 int ust_app_list_events(struct lttng_event **events)
 391 {
 392         return -ENOSYS;
 393 }
 394 static inline
 395 int ust_app_list_event_fields(struct lttng_event_field **fields)
 396 {
 397         return -ENOSYS;
 398 }
 399 static inline
 400 int ust_app_register(struct ust_register_msg *msg, int sock)
 401 {
 402         return -ENOSYS;
 403 }
 404 static inline
 405 int ust_app_register_done(struct ust_app *app)
 406 {
 407         return -ENOSYS;
 408 }
 409 static inline
 410 int ust_app_version(struct ust_app *app)
 411 {
 412         return -ENOSYS;
 413 }
 414 static inline
 415 void ust_app_unregister(int sock)
 416 {
 417 }
 418 static inline
 419 void ust_app_lock_list(void)
 420 {
 421 }
 422 static inline
 423 void ust_app_unlock_list(void)
 424 {
 425 }
 426 static inline
 427 void ust_app_clean_list(void)
 428 {
 429 }
 430 static inline
 431 struct ust_app_list *ust_app_get_list(void)
 432 {
 433         return NULL;
 434 }
 435 static inline
 436 struct ust_app *ust_app_get_by_pid(pid_t pid)
 437 {
 438         return NULL;
 439 }
 440 static inline
 441 int ust_app_ht_alloc(void)
 442 {
 443         return 0;
 444 }
 445 static inline
 446 void ust_app_global_update(struct ltt_ust_session *usess, struct ust_app *app)
 447 {}
 448 static inline
 449 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
 450                 struct ltt_ust_channel *uchan)
 451 {
 452         return 0;
 453 }
 454 static inline
 455 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
 456                 struct ltt_ust_channel *uchan)
 457 {
 458         return 0;
 459 }
 460 static inline
 461 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
 462                 struct ltt_ust_channel *uchan)
 463 {
 464         return 0;
 465 }
 466 static inline
 467 int ust_app_create_event_glb(struct ltt_ust_session *usess,
 468                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
 469 {
 470         return 0;
 471 }
 472 static inline
 473 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
 474                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
 475 {
 476         return 0;
 477 }
 478 static inline
 479 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
 480                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
 481 {
 482         return 0;
 483 }
 484 static inline
 485 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
 486                 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
 487 {
 488         return 0;
 489 }
 490 static inline
 491 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
 492                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
 493                 pid_t pid)
 494 {
 495         return 0;
 496 }
 497 static inline
 498 int ust_app_recv_registration(int sock, struct ust_register_msg *msg)
 499 {
 500         return 0;
 501 }
 502 static inline
 503 int ust_app_recv_notify(int sock)
 504 {
 505         return 0;
 506 }
 507 static inline
 508 struct ust_app *ust_app_create(struct ust_register_msg *msg, int sock)
 509 {
 510         return NULL;
 511 }
 512 static inline
 513 void ust_app_add(struct ust_app *app)
 514 {
 515 }
 516 static inline
 517 void ust_app_notify_sock_unregister(int sock)
 518 {
 519 }
 520 static inline
 521 ssize_t ust_app_push_metadata(struct ust_registry_session *registry,
 522                 struct consumer_socket *socket, int send_zero_data)
 523 {
 524         return 0;
 525 }
 526 static inline
 527 void ust_app_destroy(struct ust_app *app)
 528 {
 529         return;
 530 }
 531 static inline
 532 enum lttng_error_code ust_app_snapshot_record(struct ltt_ust_session *usess,
 533                 struct snapshot_output *output, int wait, uint64_t max_stream_size)
 534 {
 535         return 0;
 536 }
 537 static inline
 538 unsigned int ust_app_get_nb_stream(struct ltt_ust_session *usess)
 539 {
 540         return 0;
 541 }
 542
 543 static inline
 544 int ust_app_supported(void)
 545 {
 546         return 0;
 547 }
 548 static inline
 549 struct ust_app *ust_app_find_by_sock(int sock)
 550 {
 551         return NULL;
 552 }
 553 static inline
 554 struct ust_app *ust_app_find_by_pid(pid_t pid)
 555 {
 556         return NULL;
 557 }
 558 static inline
 559 uint64_t ust_app_get_size_one_more_packet_per_stream(
 560                 struct ltt_ust_session *usess, uint64_t cur_nr_packets) {
 561         return 0;
 562 }
 563 static inline
 564 int ust_app_uid_get_channel_runtime_stats(uint64_t ust_session_id,
 565                 struct cds_list_head *buffer_reg_uid_list,
 566                 struct consumer_output *consumer, int overwrite,
 567                 uint64_t uchan_id, uint64_t *discarded, uint64_t *lost)
 568 {
 569         return 0;
 570 }
 571
 572 static inline
 573 int ust_app_pid_get_channel_runtime_stats(struct ltt_ust_session *usess,
 574                 struct ltt_ust_channel *uchan,
 575                 struct consumer_output *consumer,
 576                 int overwrite, uint64_t *discarded, uint64_t *lost)
 577 {
 578         return 0;
 579 }
 580
 581 static inline
 582 int ust_app_regenerate_statedump_all(struct ltt_ust_session *usess)
 583 {
 584         return 0;
 585 }
 586
 587 static inline
 588 enum lttng_error_code ust_app_rotate_session(struct ltt_session *session)
 589 {
 590         return 0;
 591 }
 592
 593 #endif /* HAVE_LIBLTTNG_UST_CTL */
 594
 595 #endif /* _LTT_UST_APP_H */