include/lttng/event.h

   1 /*
   2  * Copyright (C) 2014 - David Goulet <dgoulet@efficios.com>
   3  * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
   4  *
   5  * This library is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU Lesser General Public License, version 2.1 only,
   7  * as published by the Free Software Foundation.
   8  *
   9  * This library is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License
  12  * for more details.
  13  *
  14  * You should have received a copy of the GNU Lesser General Public License
  15  * along with this library; if not, write to the Free Software Foundation,
  16  * Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
  17  */
  18
  19 #ifndef LTTNG_EVENT_H
  20 #define LTTNG_EVENT_H
  21
  22 #ifdef __cplusplus
  23 extern "C" {
  24 #endif
  25
  26 #include <lttng/handle.h>
  27
  28 /*
  29  * Instrumentation type of tracing event.
  30  */
  31 enum lttng_event_type {
  32         LTTNG_EVENT_ALL                       = -1,
  33         LTTNG_EVENT_TRACEPOINT                = 0,
  34         LTTNG_EVENT_PROBE                     = 1,
  35         LTTNG_EVENT_FUNCTION                  = 2,
  36         LTTNG_EVENT_FUNCTION_ENTRY            = 3,
  37         LTTNG_EVENT_NOOP                      = 4,
  38         LTTNG_EVENT_SYSCALL                   = 5,
  39 };
  40
  41 /*
  42  * Loglevel information.
  43  */
  44 enum lttng_loglevel_type {
  45         LTTNG_EVENT_LOGLEVEL_ALL              = 0,
  46         LTTNG_EVENT_LOGLEVEL_RANGE            = 1,
  47         LTTNG_EVENT_LOGLEVEL_SINGLE           = 2,
  48 };
  49
  50 /*
  51  * Available loglevels.
  52  */
  53 enum lttng_loglevel {
  54         LTTNG_LOGLEVEL_EMERG                  = 0,
  55         LTTNG_LOGLEVEL_ALERT                  = 1,
  56         LTTNG_LOGLEVEL_CRIT                   = 2,
  57         LTTNG_LOGLEVEL_ERR                    = 3,
  58         LTTNG_LOGLEVEL_WARNING                = 4,
  59         LTTNG_LOGLEVEL_NOTICE                 = 5,
  60         LTTNG_LOGLEVEL_INFO                   = 6,
  61         LTTNG_LOGLEVEL_DEBUG_SYSTEM           = 7,
  62         LTTNG_LOGLEVEL_DEBUG_PROGRAM          = 8,
  63         LTTNG_LOGLEVEL_DEBUG_PROCESS          = 9,
  64         LTTNG_LOGLEVEL_DEBUG_MODULE           = 10,
  65         LTTNG_LOGLEVEL_DEBUG_UNIT             = 11,
  66         LTTNG_LOGLEVEL_DEBUG_FUNCTION         = 12,
  67         LTTNG_LOGLEVEL_DEBUG_LINE             = 13,
  68         LTTNG_LOGLEVEL_DEBUG                  = 14,
  69 };
  70
  71 /*
  72  * Available loglevels for the JUL domain. Those are an exact map from the
  73  * class java.util.logging.Level.
  74  */
  75 enum lttng_loglevel_jul {
  76         LTTNG_LOGLEVEL_JUL_OFF                = INT32_MAX,
  77         LTTNG_LOGLEVEL_JUL_SEVERE             = 1000,
  78         LTTNG_LOGLEVEL_JUL_WARNING            = 900,
  79         LTTNG_LOGLEVEL_JUL_INFO               = 800,
  80         LTTNG_LOGLEVEL_JUL_CONFIG             = 700,
  81         LTTNG_LOGLEVEL_JUL_FINE               = 500,
  82         LTTNG_LOGLEVEL_JUL_FINER              = 400,
  83         LTTNG_LOGLEVEL_JUL_FINEST             = 300,
  84         LTTNG_LOGLEVEL_JUL_ALL                = INT32_MIN,
  85 };
  86
  87 /*
  88  * Available loglevels for the LOG4j domain. Those are an exact map from the
  89  * class org.apache.log4j.Level.
  90  */
  91 enum lttng_loglevel_log4j {
  92         LTTNG_LOGLEVEL_LOG4J_OFF              = INT32_MAX,
  93         LTTNG_LOGLEVEL_LOG4J_FATAL            = 50000,
  94         LTTNG_LOGLEVEL_LOG4J_ERROR            = 40000,
  95         LTTNG_LOGLEVEL_LOG4J_WARN             = 30000,
  96         LTTNG_LOGLEVEL_LOG4J_INFO             = 20000,
  97         LTTNG_LOGLEVEL_LOG4J_DEBUG            = 10000,
  98         LTTNG_LOGLEVEL_LOG4J_TRACE            = 5000,
  99         LTTNG_LOGLEVEL_LOG4J_ALL              = INT32_MIN,
 100 };
 101
 102 /*
 103  * Available loglevels for the Python domain. Those are an exact map from the
 104  * Level class.
 105  */
 106 enum lttng_loglevel_python {
 107         LTTNG_LOGLEVEL_PYTHON_CRITICAL        = 50,
 108         LTTNG_LOGLEVEL_PYTHON_ERROR           = 40,
 109         LTTNG_LOGLEVEL_PYTHON_WARNING         = 30,
 110         LTTNG_LOGLEVEL_PYTHON_INFO            = 20,
 111         LTTNG_LOGLEVEL_PYTHON_DEBUG           = 10,
 112         LTTNG_LOGLEVEL_PYTHON_NOTSET          = 0,
 113 };
 114
 115 /*
 116  * LTTng consumer mode
 117  */
 118 enum lttng_event_output {
 119         LTTNG_EVENT_SPLICE                    = 0,
 120         LTTNG_EVENT_MMAP                      = 1,
 121 };
 122
 123 /* Event context possible type */
 124 enum lttng_event_context_type {
 125         LTTNG_EVENT_CONTEXT_PID                 = 0,
 126         LTTNG_EVENT_CONTEXT_PERF_COUNTER        = 1,    /* Backward compat. */
 127         LTTNG_EVENT_CONTEXT_PROCNAME            = 2,
 128         LTTNG_EVENT_CONTEXT_PRIO                = 3,
 129         LTTNG_EVENT_CONTEXT_NICE                = 4,
 130         LTTNG_EVENT_CONTEXT_VPID                = 5,
 131         LTTNG_EVENT_CONTEXT_TID                 = 6,
 132         LTTNG_EVENT_CONTEXT_VTID                = 7,
 133         LTTNG_EVENT_CONTEXT_PPID                = 8,
 134         LTTNG_EVENT_CONTEXT_VPPID               = 9,
 135         LTTNG_EVENT_CONTEXT_PTHREAD_ID          = 10,
 136         LTTNG_EVENT_CONTEXT_HOSTNAME            = 11,
 137         LTTNG_EVENT_CONTEXT_IP                  = 12,
 138         LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER    = 13,
 139         LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER = 14,
 140         LTTNG_EVENT_CONTEXT_APP_CONTEXT         = 15,
 141 };
 142
 143 enum lttng_event_field_type {
 144         LTTNG_EVENT_FIELD_OTHER               = 0,
 145         LTTNG_EVENT_FIELD_INTEGER             = 1,
 146         LTTNG_EVENT_FIELD_ENUM                = 2,
 147         LTTNG_EVENT_FIELD_FLOAT               = 3,
 148         LTTNG_EVENT_FIELD_STRING              = 4,
 149 };
 150
 151 enum lttng_event_flag {
 152         LTTNG_EVENT_FLAG_SYSCALL_32           = (1U << 0),
 153         LTTNG_EVENT_FLAG_SYSCALL_64           = (1U << 1),
 154 };
 155
 156 /*
 157  * Perf counter attributes
 158  *
 159  * The structures should be initialized to zero before use.
 160  */
 161 #define LTTNG_PERF_EVENT_PADDING1          16
 162 struct lttng_event_perf_counter_ctx {
 163         uint32_t type;
 164         uint64_t config;
 165         char name[LTTNG_SYMBOL_NAME_LEN];
 166
 167         char padding[LTTNG_PERF_EVENT_PADDING1];
 168 };
 169
 170 /*
 171  * Event/channel context
 172  *
 173  * The structures should be initialized to zero before use.
 174  */
 175 #define LTTNG_EVENT_CONTEXT_PADDING1       16
 176 #define LTTNG_EVENT_CONTEXT_PADDING2       LTTNG_SYMBOL_NAME_LEN + 32
 177 struct lttng_event_context {
 178         enum lttng_event_context_type ctx;
 179         char padding[LTTNG_EVENT_CONTEXT_PADDING1];
 180
 181         union {
 182                 struct lttng_event_perf_counter_ctx perf_counter;
 183                 struct {
 184                         char *provider_name;
 185                         char *ctx_name;
 186                 } app_ctx;
 187                 char padding[LTTNG_EVENT_CONTEXT_PADDING2];
 188         } u;
 189 };
 190
 191 /*
 192  * Event probe.
 193  *
 194  * Either addr is used or symbol_name and offset.
 195  *
 196  * The structures should be initialized to zero before use.
 197  */
 198 #define LTTNG_EVENT_PROBE_PADDING1         16
 199 struct lttng_event_probe_attr {
 200         uint64_t addr;
 201
 202         uint64_t offset;
 203         char symbol_name[LTTNG_SYMBOL_NAME_LEN];
 204
 205         char padding[LTTNG_EVENT_PROBE_PADDING1];
 206 };
 207
 208 /*
 209  * Function tracer
 210  *
 211  * The structures should be initialized to zero before use.
 212  */
 213 #define LTTNG_EVENT_FUNCTION_PADDING1      16
 214 struct lttng_event_function_attr {
 215         char symbol_name[LTTNG_SYMBOL_NAME_LEN];
 216
 217         char padding[LTTNG_EVENT_FUNCTION_PADDING1];
 218 };
 219
 220 /*
 221  * Generic lttng event
 222  *
 223  * The structures should be initialized to zero before use.
 224  */
 225 #define LTTNG_EVENT_PADDING1               12
 226 #define LTTNG_EVENT_PADDING2               LTTNG_SYMBOL_NAME_LEN + 32
 227 struct lttng_event {
 228         /* Offset 0 */
 229         enum lttng_event_type type;
 230
 231         /* Offset 4 */
 232         char name[LTTNG_SYMBOL_NAME_LEN];
 233
 234         /* Offset 260 */
 235         enum lttng_loglevel_type loglevel_type;
 236
 237         /* Offset 264 */
 238         int loglevel;
 239
 240         /* Offset 268 */
 241         int32_t enabled;        /* Does not apply: -1 */
 242
 243         /* Offset 272 */
 244         pid_t pid;
 245
 246         /* Offset 276 */
 247         unsigned char filter;   /* filter enabled ? */
 248
 249         /* Offset 277 */
 250         unsigned char exclusion; /* exclusions added ? */
 251
 252         /* Offset 278 */
 253         char padding2[2];
 254
 255         /* Offset 280 */
 256         /* Event flag, from 2.6 and above. */
 257         enum lttng_event_flag flags;
 258
 259         /* Offset 284 */
 260         char padding[4];
 261
 262         /* Offset 288 */
 263         union {
 264                 uint64_t padding;
 265                 void *ptr;
 266         } extended;
 267
 268         /* Offset 296 */
 269         /* Per event type configuration */
 270         union {
 271                 struct lttng_event_probe_attr probe;
 272                 struct lttng_event_function_attr ftrace;
 273
 274                 char padding[LTTNG_EVENT_PADDING2];
 275         } attr;
 276 };
 277
 278 #define LTTNG_EVENT_FIELD_PADDING       LTTNG_SYMBOL_NAME_LEN + 32
 279 struct lttng_event_field {
 280         char field_name[LTTNG_SYMBOL_NAME_LEN];
 281         enum lttng_event_field_type type;
 282         char padding[LTTNG_EVENT_FIELD_PADDING];
 283         struct lttng_event event;
 284         int nowrite;
 285 };
 286
 287 /*
 288  * List the event(s) of a session channel.
 289  *
 290  * Both handle and channel_name CAN NOT be NULL.
 291  *
 292  * Return the size (number of entries) of the "lttng_event" array. Caller must
 293  * free events. On error a negative LTTng error code is returned.
 294  */
 295 extern int lttng_list_events(struct lttng_handle *handle,
 296                 const char *channel_name, struct lttng_event **events);
 297
 298 /*
 299  * Get the filter string of a specific LTTng event.
 300  *
 301  * If the call is successful, then the filter string's address is put
 302  * in *filter_string. If the event has no filter string, *filter_string
 303  * is set to NULL. The caller does NOT own *filter_string.
 304  *
 305  * Returns 0 on success, or a negative LTTng error code on error.
 306  */
 307 extern int lttng_event_get_filter_string(struct lttng_event *event,
 308                 const char **filter_string);
 309
 310 /*
 311  * Get the number of exclusion names of a specific LTTng event.
 312  *
 313  * Returns the number of exclusion names on success, or a negative
 314  * LTTng error code on error.
 315  */
 316 extern int lttng_event_get_exclusion_name_count(struct lttng_event *event);
 317
 318 /*
 319  * Get an LTTng event's exclusion name at a given index.
 320  *
 321  * If the call is successful, then the exclusion name string's address
 322  * is put in *exclusion_name. The caller does NOT own *exclusion_name.
 323  *
 324  * Returns 0 on success, or a negative LTTng error code on error.
 325  */
 326 extern int lttng_event_get_exclusion_name(struct lttng_event *event,
 327                 size_t index, const char **exclusion_name);
 328
 329 /*
 330  * List the available tracepoints of a specific lttng domain.
 331  *
 332  * The handle CAN NOT be NULL.
 333  *
 334  * Return the size (number of entries) of the "lttng_event" array.  Caller must
 335  * free events. On error a negative LTTng error code is returned.
 336  */
 337 extern int lttng_list_tracepoints(struct lttng_handle *handle,
 338                 struct lttng_event **events);
 339
 340 /*
 341  * List the available tracepoints fields of a specific lttng domain.
 342  *
 343  * The handle CAN NOT be NULL.
 344  *
 345  * Return the size (number of entries) of the "lttng_event_field" array.
 346  * Caller must free fields. On error a negative LTTng error code is
 347  * returned.
 348  */
 349 extern int lttng_list_tracepoint_fields(struct lttng_handle *handle,
 350                 struct lttng_event_field **fields);
 351
 352 /*
 353  * List the available kernel syscall.
 354  *
 355  * Return the size (number of entries) of the allocated "lttng_event" array.
 356  * All events in will be of type syscall. Caller must free events. On error a
 357  * negative LTTng error code is returned.
 358  */
 359 extern int lttng_list_syscalls(struct lttng_event **events);
 360
 361 /*
 362  * Add context to event(s) for a specific channel (or for all).
 363  *
 364  * If the channel_name is NULL and they are no channel for the domain, the
 365  * default channel is created (channel0). The context is then added on ALL
 366  * channels since no name was specified.
 367  *
 368  * The event_name is ignored since adding a context to an event is not possible
 369  * for now.
 370  *
 371  * Return 0 on success else a negative LTTng error code.
 372  */
 373 extern int lttng_add_context(struct lttng_handle *handle,
 374                 struct lttng_event_context *ctx, const char *event_name,
 375                 const char *channel_name);
 376
 377 /*
 378  * Create or enable an event (or events) for a channel.
 379  *
 380  * If the event you are trying to enable does not exist, it will be created,
 381  * else it is enabled. If channel_name is NULL, the default channel is used
 382  * (channel0).
 383  *
 384  * The handle and ev params can not be NULL.
 385  *
 386  * Return 0 on success else a negative LTTng error code.
 387  */
 388 extern int lttng_enable_event(struct lttng_handle *handle,
 389                 struct lttng_event *ev, const char *channel_name);
 390
 391 /*
 392  * Create or enable an event with a specific filter.
 393  *
 394  * If the event you are trying to enable does not exist, it will be created,
 395  * else it is enabled.
 396  * If ev is NULL, all events are enabled with that filter.
 397  * If channel_name is NULL, the default channel is used (channel0) and created
 398  * if not found.
 399  * If filter_expression is NULL, an event without associated filter is
 400  * created.
 401  *
 402  * Return 0 on success else a negative LTTng error code.
 403  */
 404 extern int lttng_enable_event_with_filter(struct lttng_handle *handle,
 405                 struct lttng_event *event, const char *channel_name,
 406                 const char *filter_expression);
 407
 408 /*
 409  * Create or enable an event with a filter and/or exclusions.
 410  *
 411  * If the event you are trying to enable does not exist, it will be created,
 412  * else it is enabled.
 413  * If ev is NULL, all events are enabled with the filter and exclusion options.
 414  * If channel_name is NULL, the default channel is used (channel0) and created
 415  * if not found.
 416  * If filter_expression is NULL, an event without associated filter is
 417  * created.
 418  * If exclusion count is zero, the event will be created without exclusions.
 419  *
 420  * Return 0 on success else a negative LTTng error code.
 421  */
 422 extern int lttng_enable_event_with_exclusions(struct lttng_handle *handle,
 423                 struct lttng_event *event, const char *channel_name,
 424                 const char *filter_expression,
 425                 int exclusion_count, char **exclusion_names);
 426
 427 /*
 428  * Disable event(s) of a channel and domain.
 429  *
 430  * If name is NULL, all events are disabled.
 431  * If channel_name is NULL, the default channel is used (channel0).
 432  *
 433  * Return 0 on success else a negative LTTng error code.
 434  */
 435 extern int lttng_disable_event(struct lttng_handle *handle,
 436                 const char *name, const char *channel_name);
 437
 438 /*
 439  * Disable event(s) of a channel and domain.
 440  *
 441  * Takes a struct lttng_event as parameter.
 442  * If channel_name is NULL, the default channel is used (channel0).
 443  *
 444  * Currently, @filter_expression must be NULL. (disabling specific
 445  * filter expressions not implemented)
 446  * Currently, only LTTNG_EVENT_ALL and LTTNG_EVENT_SYSCALL event types
 447  * are implemented for field @ev.
 448  *
 449  * Return 0 on success else a negative LTTng error code.
 450  */
 451 int lttng_disable_event_ext(struct lttng_handle *handle,
 452                 struct lttng_event *ev, const char *channel_name,
 453                 const char *filter_expression);
 454
 455 #ifdef __cplusplus
 456 }
 457 #endif
 458
 459 #endif /* LTTNG_EVENT_H */