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

   1 /*
   2  * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
   3  * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   4  *
   5  * SPDX-License-Identifier: GPL-2.0-only
   6  *
   7  */
   8
   9 #ifndef _LTT_TRACE_UST_H
  10 #define _LTT_TRACE_UST_H
  11
  12 #include <limits.h>
  13 #include <urcu/list.h>
  14
  15 #include <common/defaults.h>
  16 #include <common/hashtable/hashtable.h>
  17 #include <common/tracker.h>
  18 #include <lttng/lttng.h>
  19
  20 #include "consumer.h"
  21 #include "lttng-ust-ctl.h"
  22
  23 struct agent;
  24
  25 struct ltt_ust_ht_key {
  26         const char *name;
  27         const struct lttng_bytecode *filter;
  28         enum lttng_ust_abi_loglevel_type loglevel_type;
  29         int loglevel_value;
  30         const struct lttng_event_exclusion *exclusion;
  31 };
  32
  33 /* Context hash table nodes */
  34 struct ltt_ust_context {
  35         struct lttng_ust_context_attr ctx;
  36         struct lttng_ht_node_ulong node;
  37         struct cds_list_head list;
  38 };
  39
  40 /* UST event */
  41 struct ltt_ust_event {
  42         unsigned int enabled;
  43         struct lttng_ust_abi_event attr;
  44         struct lttng_ht_node_str node;
  45         char *filter_expression;
  46         struct lttng_bytecode *filter;
  47         struct lttng_event_exclusion *exclusion;
  48         /*
  49          * An internal event is an event which was created by the session daemon
  50          * through which, for example, events emitted in Agent domains are
  51          * "funelled". This is used to hide internal events from external
  52          * clients as they should never be modified by the external world.
  53          */
  54         bool internal;
  55 };
  56
  57 /* UST channel */
  58 struct ltt_ust_channel {
  59         uint64_t id;    /* unique id per session. */
  60         unsigned int enabled;
  61         /*
  62          * A UST channel can be part of a userspace sub-domain such as JUL,
  63          * Log4j, Python.
  64          */
  65         enum lttng_domain_type domain;
  66         char name[LTTNG_UST_ABI_SYM_NAME_LEN];
  67         struct lttng_ust_abi_channel_attr attr;
  68         struct lttng_ht *ctx;
  69         struct cds_list_head ctx_list;
  70         struct lttng_ht *events;
  71         struct lttng_ht_node_str node;
  72         uint64_t tracefile_size;
  73         uint64_t tracefile_count;
  74         uint64_t per_pid_closed_app_discarded;
  75         uint64_t per_pid_closed_app_lost;
  76         uint64_t monitor_timer_interval;
  77 };
  78
  79 /* UST domain global (LTTNG_DOMAIN_UST) */
  80 struct ltt_ust_domain_global {
  81         struct lttng_ht *channels;
  82         struct cds_list_head registry_buffer_uid_list;
  83 };
  84
  85 struct ust_id_tracker_node {
  86         struct lttng_ht_node_ulong node;
  87 };
  88
  89 struct ust_id_tracker {
  90         struct lttng_ht *ht;
  91 };
  92
  93 /* UST session */
  94 struct ltt_ust_session {
  95         uint64_t id;    /* Unique identifier of session */
  96         struct ltt_ust_domain_global domain_global;
  97         /* Hash table of agent indexed by agent domain. */
  98         struct lttng_ht *agents;
  99         /* UID/GID of the user owning the session */
 100         uid_t uid;
 101         gid_t gid;
 102         /* Is the session active meaning has is been started or stopped. */
 103         unsigned int active:1;
 104         struct consumer_output *consumer;
 105         /* Sequence number for filters so the tracer knows the ordering. */
 106         uint64_t filter_seq_num;
 107         /* This indicates which type of buffer this session is set for. */
 108         enum lttng_buffer_type buffer_type;
 109         /* If set to 1, the buffer_type can not be changed anymore. */
 110         int buffer_type_changed;
 111         /* For per UID buffer, every buffer reg object is kept of this session */
 112         struct cds_list_head buffer_reg_uid_list;
 113         /* Next channel ID available for a newly registered channel. */
 114         uint64_t next_channel_id;
 115         /* Once this value reaches UINT32_MAX, no more id can be allocated. */
 116         uint64_t used_channel_id;
 117         /* Tell or not if the session has to output the traces. */
 118         unsigned int output_traces;
 119         unsigned int snapshot_mode;
 120         unsigned int has_non_default_channel;
 121         unsigned int live_timer_interval;       /* usec */
 122
 123         /* Metadata channel attributes. */
 124         struct lttng_ust_abi_channel_attr metadata_attr;
 125
 126         /*
 127          * Path where to keep the shared memory files.
 128          */
 129         char root_shm_path[PATH_MAX];
 130         char shm_path[PATH_MAX];
 131
 132         /* Current trace chunk of the ltt_session. */
 133         struct lttng_trace_chunk *current_trace_chunk;
 134
 135         /* Trackers used for actual lookup on app registration. */
 136         struct ust_id_tracker vpid_tracker;
 137         struct ust_id_tracker vuid_tracker;
 138         struct ust_id_tracker vgid_tracker;
 139
 140         /* Tracker list of keys requested by users. */
 141         struct process_attr_tracker *tracker_vpid;
 142         struct process_attr_tracker *tracker_vuid;
 143         struct process_attr_tracker *tracker_vgid;
 144 };
 145
 146 /*
 147  * Validate that the id has reached the maximum allowed or not.
 148  *
 149  * Return 0 if NOT else 1.
 150  */
 151 static inline int trace_ust_is_max_id(uint64_t id)
 152 {
 153         return (id == UINT64_MAX) ? 1 : 0;
 154 }
 155
 156 /*
 157  * Return next available channel id and increment the used counter. The
 158  * trace_ust_is_max_id function MUST be called before in order to validate if
 159  * the maximum number of IDs have been reached. If not, it is safe to call this
 160  * function.
 161  *
 162  * Return a unique channel ID. If max is reached, the used_channel_id counter
 163  * is returned.
 164  */
 165 static inline uint64_t trace_ust_get_next_chan_id(struct ltt_ust_session *s)
 166 {
 167         if (trace_ust_is_max_id(s->used_channel_id)) {
 168                 return s->used_channel_id;
 169         }
 170
 171         s->used_channel_id++;
 172         return s->next_channel_id++;
 173 }
 174
 175 #ifdef HAVE_LIBLTTNG_UST_CTL
 176
 177 int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key);
 178 int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node,
 179                 const void *_key);
 180
 181 /*
 182  * Lookup functions. NULL is returned if not found.
 183  */
 184 struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
 185                 char *name, struct lttng_bytecode *filter,
 186                 enum lttng_ust_abi_loglevel_type loglevel_type, int loglevel_value,
 187                 struct lttng_event_exclusion *exclusion);
 188 struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
 189                 const char *name);
 190 struct agent *trace_ust_find_agent(struct ltt_ust_session *session,
 191                 enum lttng_domain_type domain_type);
 192
 193 /*
 194  * Create functions malloc() the data structure.
 195  */
 196 struct ltt_ust_session *trace_ust_create_session(uint64_t session_id);
 197 struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *attr,
 198                 enum lttng_domain_type domain);
 199 enum lttng_error_code trace_ust_create_event(struct lttng_event *ev,
 200                 char *filter_expression,
 201                 struct lttng_bytecode *filter,
 202                 struct lttng_event_exclusion *exclusion,
 203                 bool internal_event, struct ltt_ust_event **ust_event);
 204 struct ltt_ust_context *trace_ust_create_context(
 205                 const struct lttng_event_context *ctx);
 206 int trace_ust_match_context(const struct ltt_ust_context *uctx,
 207                 const struct lttng_event_context *ctx);
 208 void trace_ust_delete_channel(struct lttng_ht *ht,
 209                 struct ltt_ust_channel *channel);
 210
 211 /*
 212  * Destroy functions free() the data structure and remove from linked list if
 213  * it's applies.
 214  */
 215 void trace_ust_destroy_session(struct ltt_ust_session *session);
 216 void trace_ust_destroy_channel(struct ltt_ust_channel *channel);
 217 void trace_ust_destroy_event(struct ltt_ust_event *event);
 218 void trace_ust_destroy_context(struct ltt_ust_context *ctx);
 219 void trace_ust_free_session(struct ltt_ust_session *session);
 220
 221 int trace_ust_id_tracker_lookup(enum lttng_process_attr process_attr,
 222                 struct ltt_ust_session *session,
 223                 int id);
 224 enum lttng_error_code trace_ust_process_attr_tracker_set_tracking_policy(
 225                 struct ltt_ust_session *session,
 226                 enum lttng_process_attr process_attr,
 227                 enum lttng_tracking_policy policy);
 228 enum lttng_error_code trace_ust_process_attr_tracker_inclusion_set_add_value(
 229                 struct ltt_ust_session *session,
 230                 enum lttng_process_attr process_attr,
 231                 const struct process_attr_value *value);
 232 enum lttng_error_code trace_ust_process_attr_tracker_inclusion_set_remove_value(
 233                 struct ltt_ust_session *session,
 234                 enum lttng_process_attr process_attr,
 235                 const struct process_attr_value *value);
 236 const struct process_attr_tracker *trace_ust_get_process_attr_tracker(
 237                 struct ltt_ust_session *session,
 238                 enum lttng_process_attr process_attr);
 239
 240 #else /* HAVE_LIBLTTNG_UST_CTL */
 241
 242 static inline int trace_ust_ht_match_event(struct cds_lfht_node *node,
 243                 const void *_key)
 244 {
 245         return 0;
 246 }
 247 static inline int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node,
 248                 const void *_key)
 249 {
 250         return 0;
 251 }
 252 static inline
 253 struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
 254                 const char *name)
 255 {
 256         return NULL;
 257 }
 258
 259 static inline
 260 struct ltt_ust_session *trace_ust_create_session(unsigned int session_id)
 261 {
 262         return NULL;
 263 }
 264 static inline
 265 struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *attr,
 266                 enum lttng_domain_type domain)
 267 {
 268         return NULL;
 269 }
 270 static inline
 271 enum lttng_error_code trace_ust_create_event(struct lttng_event *ev,
 272                 const char *filter_expression,
 273                 struct lttng_bytecode *filter,
 274                 struct lttng_event_exclusion *exclusion,
 275                 bool internal_event, struct ltt_ust_event **ust_event)
 276 {
 277         return LTTNG_ERR_NO_UST;
 278 }
 279 static inline
 280 void trace_ust_destroy_session(struct ltt_ust_session *session)
 281 {
 282 }
 283
 284 static inline
 285 void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
 286 {
 287 }
 288
 289 static inline
 290 void trace_ust_destroy_event(struct ltt_ust_event *event)
 291 {
 292 }
 293
 294 static inline
 295 void trace_ust_free_session(struct ltt_ust_session *session)
 296 {
 297 }
 298
 299 static inline
 300 struct ltt_ust_context *trace_ust_create_context(
 301                 const struct lttng_event_context *ctx)
 302 {
 303         return NULL;
 304 }
 305 static inline
 306 int trace_ust_match_context(const struct ltt_ust_context *uctx,
 307                 const struct lttng_event_context *ctx)
 308 {
 309         return 0;
 310 }
 311 static inline
 312 struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
 313                 char *name, struct lttng_bytecode *filter,
 314                 enum lttng_ust_abi_loglevel_type loglevel_type, int loglevel_value,
 315                 struct lttng_event_exclusion *exclusion)
 316 {
 317         return NULL;
 318 }
 319 static inline
 320 void trace_ust_delete_channel(struct lttng_ht *ht,
 321                 struct ltt_ust_channel *channel)
 322 {
 323         return;
 324 }
 325 static inline
 326 struct agent *trace_ust_find_agent(struct ltt_ust_session *session,
 327                 enum lttng_domain_type domain_type)
 328 {
 329         return NULL;
 330 }
 331 static inline int trace_ust_id_tracker_lookup(
 332                 enum lttng_process_attr process_attr,
 333                 struct ltt_ust_session *session,
 334                 int id)
 335 {
 336         return 0;
 337 }
 338 static inline enum lttng_error_code
 339 trace_ust_process_attr_tracker_set_tracking_policy(
 340                 struct ltt_ust_session *session,
 341                 enum lttng_process_attr process_attr,
 342                 enum lttng_tracking_policy policy)
 343 {
 344         return LTTNG_OK;
 345 }
 346 static inline enum lttng_error_code
 347 trace_ust_process_attr_tracker_inclusion_set_add_value(
 348                 struct ltt_ust_session *session,
 349                 enum lttng_process_attr process_attr,
 350                 const struct process_attr_value *value)
 351 {
 352         return LTTNG_OK;
 353 }
 354 static inline enum lttng_error_code
 355 trace_ust_process_attr_tracker_inclusion_set_remove_value(
 356                 struct ltt_ust_session *session,
 357                 enum lttng_process_attr process_attr,
 358                 const struct process_attr_value *value)
 359 {
 360         return LTTNG_OK;
 361 }
 362 static inline const struct process_attr_tracker *
 363 trace_ust_get_process_attr_tracker(struct ltt_ust_session *session,
 364                 enum lttng_process_attr process_attr)
 365 {
 366         return NULL;
 367 }
 368
 369 #endif /* HAVE_LIBLTTNG_UST_CTL */
 370
 371 #endif /* _LTT_TRACE_UST_H */