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