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

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