src/bin/lttng/commands/list_triggers.c

   1 /*
   2  * Copyright (C) 2021 Simon Marchi <simon.marchi@efficios.com>
   3  *
   4  * SPDX-License-Identifier: GPL-2.0-only
   5  *
   6  */
   7
   8 #include <stdio.h>
   9
  10 #include "../command.h"
  11
  12 #include "common/argpar/argpar.h"
  13 #include "common/dynamic-array.h"
  14 #include "common/mi-lttng.h"
  15 /* For lttng_condition_type_str(). */
  16 #include "lttng/condition/condition-internal.h"
  17 #include "lttng/condition/on-event.h"
  18 #include "lttng/condition/on-event-internal.h"
  19 /* For lttng_domain_type_str(). */
  20 #include "lttng/domain-internal.h"
  21 #include "../loglevel.h"
  22
  23 #ifdef LTTNG_EMBED_HELP
  24 static const char help_msg[] =
  25 #include <lttng-list-triggers.1.h>
  26 ;
  27 #endif
  28
  29 enum {
  30         OPT_HELP,
  31         OPT_LIST_OPTIONS,
  32 };
  33
  34 static const
  35 struct argpar_opt_descr list_trigger_options[] = {
  36         { OPT_HELP, 'h', "help", false },
  37         { OPT_LIST_OPTIONS, '\0', "list-options", false },
  38         ARGPAR_OPT_DESCR_SENTINEL,
  39 };
  40
  41 /*
  42  * Returns the human-readable log level name associated with a numerical value
  43  * if there is one. The Log4j and JUL domains have discontinuous log level
  44  * values (a value can fall between two labels). In those cases, NULL is
  45  * returned.
  46  */
  47 static const char *get_pretty_loglevel_name(
  48                 enum lttng_domain_type domain, int loglevel)
  49 {
  50         const char *name = NULL;
  51
  52         switch (domain) {
  53         case LTTNG_DOMAIN_UST:
  54                 name = loglevel_value_to_name(loglevel);
  55                 break;
  56         case LTTNG_DOMAIN_LOG4J:
  57                 name = loglevel_log4j_value_to_name(loglevel);
  58                 break;
  59         case LTTNG_DOMAIN_JUL:
  60                 name = loglevel_jul_value_to_name(loglevel);
  61                 break;
  62         case LTTNG_DOMAIN_PYTHON:
  63                 name = loglevel_python_value_to_name(loglevel);
  64                 break;
  65         default:
  66                 break;
  67         }
  68
  69         return name;
  70 }
  71
  72 static
  73 void print_event_rule_tracepoint(const struct lttng_event_rule *event_rule)
  74 {
  75         enum lttng_event_rule_status event_rule_status;
  76         enum lttng_domain_type domain_type;
  77         const char *pattern;
  78         const char *filter;
  79         int log_level;
  80         const struct lttng_log_level_rule *log_level_rule = NULL;
  81         unsigned int exclusions_count;
  82         int i;
  83
  84         event_rule_status = lttng_event_rule_tracepoint_get_pattern(
  85                         event_rule, &pattern);
  86         assert(event_rule_status == LTTNG_EVENT_RULE_STATUS_OK);
  87
  88         event_rule_status = lttng_event_rule_tracepoint_get_domain_type(
  89                         event_rule, &domain_type);
  90         assert(event_rule_status == LTTNG_EVENT_RULE_STATUS_OK);
  91
  92         _MSG("    rule: %s (type: tracepoint, domain: %s", pattern,
  93                         lttng_domain_type_str(domain_type));
  94
  95         event_rule_status = lttng_event_rule_tracepoint_get_filter(
  96                         event_rule, &filter);
  97         if (event_rule_status == LTTNG_EVENT_RULE_STATUS_OK) {
  98                 _MSG(", filter: %s", filter);
  99         } else {
 100                 assert(event_rule_status == LTTNG_EVENT_RULE_STATUS_UNSET);
 101         }
 102
 103         event_rule_status = lttng_event_rule_tracepoint_get_log_level_rule(
 104                         event_rule, &log_level_rule);
 105         if (event_rule_status == LTTNG_EVENT_RULE_STATUS_OK) {
 106                 enum lttng_log_level_rule_status llr_status;
 107                 const char *log_level_op;
 108                 const char *pretty_loglevel_name;
 109
 110                 switch (lttng_log_level_rule_get_type(log_level_rule)) {
 111                 case LTTNG_LOG_LEVEL_RULE_TYPE_EXACTLY:
 112                         log_level_op = "is";
 113                         llr_status = lttng_log_level_rule_exactly_get_level(
 114                                         log_level_rule, &log_level);
 115                         break;
 116                 case LTTNG_LOG_LEVEL_RULE_TYPE_AT_LEAST_AS_SEVERE_AS:
 117                         log_level_op = "at least";
 118                         llr_status = lttng_log_level_rule_at_least_as_severe_as_get_level(
 119                                         log_level_rule, &log_level);
 120                         break;
 121                 default:
 122                         abort();
 123                 }
 124
 125                 assert(llr_status == LTTNG_LOG_LEVEL_RULE_STATUS_OK);
 126
 127                 pretty_loglevel_name = get_pretty_loglevel_name(
 128                                 domain_type, log_level);
 129                 if (pretty_loglevel_name) {
 130                         _MSG(", log level %s %s", log_level_op,
 131                                         pretty_loglevel_name);
 132                 } else {
 133                         _MSG(", log level %s %d", log_level_op, log_level);
 134                 }
 135         } else {
 136                 assert(event_rule_status == LTTNG_EVENT_RULE_STATUS_UNSET);
 137         }
 138
 139         event_rule_status = lttng_event_rule_tracepoint_get_exclusions_count(
 140                         event_rule, &exclusions_count);
 141         assert(event_rule_status == LTTNG_EVENT_RULE_STATUS_OK);
 142         if (exclusions_count > 0) {
 143                 _MSG(", exclusions: ");
 144                 for (i = 0; i < exclusions_count; i++) {
 145                         const char *exclusion;
 146
 147                         event_rule_status = lttng_event_rule_tracepoint_get_exclusion_at_index(
 148                                         event_rule, i, &exclusion);
 149                         assert(event_rule_status == LTTNG_EVENT_RULE_STATUS_OK);
 150
 151                         _MSG("%s%s", i > 0 ? "," : "", exclusion);
 152                 }
 153         }
 154
 155         MSG(")");
 156 }
 157
 158 static void print_kernel_probe_location(
 159                 const struct lttng_kernel_probe_location *location)
 160 {
 161         enum lttng_kernel_probe_location_status status;
 162         switch (lttng_kernel_probe_location_get_type(location)) {
 163         case LTTNG_KERNEL_PROBE_LOCATION_TYPE_ADDRESS:
 164         {
 165                 uint64_t address;
 166
 167                 status = lttng_kernel_probe_location_address_get_address(
 168                                 location, &address);
 169                 if (status != LTTNG_KERNEL_PROBE_LOCATION_STATUS_OK) {
 170                         ERR("Getting kernel probe location address failed.");
 171                         goto end;
 172                 }
 173
 174                 _MSG("0x%" PRIx64, address);
 175
 176                 break;
 177         }
 178         case LTTNG_KERNEL_PROBE_LOCATION_TYPE_SYMBOL_OFFSET:
 179         {
 180                 uint64_t offset;
 181                 const char *symbol_name;
 182
 183                 symbol_name = lttng_kernel_probe_location_symbol_get_name(
 184                                 location);
 185                 if (!symbol_name) {
 186                         ERR("Getting kernel probe location symbol name failed.");
 187                         goto end;
 188                 }
 189
 190                 status = lttng_kernel_probe_location_symbol_get_offset(
 191                                 location, &offset);
 192                 if (status != LTTNG_KERNEL_PROBE_LOCATION_STATUS_OK) {
 193                         ERR("Getting kernel probe location address failed.");
 194                         goto end;
 195                 }
 196
 197                 if (offset == 0) {
 198                         _MSG("%s", symbol_name);
 199                 } else {
 200                         _MSG("%s+0x%" PRIx64, symbol_name, offset);
 201                 }
 202
 203                 break;
 204         }
 205         default:
 206                 abort();
 207         };
 208 end:
 209         return;
 210 }
 211
 212 static
 213 void print_event_rule_kernel_probe(const struct lttng_event_rule *event_rule)
 214 {
 215         enum lttng_event_rule_status event_rule_status;
 216         const char *name;
 217         const struct lttng_kernel_probe_location *location;
 218
 219         assert(lttng_event_rule_get_type(event_rule) == LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE);
 220
 221         event_rule_status = lttng_event_rule_kernel_probe_get_event_name(event_rule, &name);
 222         if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
 223                 ERR("Failed to get kprobe event rule's name.");
 224                 goto end;
 225         }
 226
 227         event_rule_status = lttng_event_rule_kernel_probe_get_location(
 228                         event_rule, &location);
 229         if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
 230                 ERR("Failed to get kprobe event rule's location.");
 231                 goto end;
 232         }
 233
 234         _MSG("    rule: %s (type: probe, location: ", name);
 235
 236         print_kernel_probe_location(location);
 237
 238         MSG(")");
 239
 240 end:
 241         return;
 242 }
 243
 244 static
 245 void print_event_rule_userspace_probe(const struct lttng_event_rule *event_rule)
 246 {
 247         enum lttng_event_rule_status event_rule_status;
 248         const char *name;
 249         const struct lttng_userspace_probe_location *location;
 250         enum lttng_userspace_probe_location_type userspace_probe_location_type;
 251
 252         assert(lttng_event_rule_get_type(event_rule) == LTTNG_EVENT_RULE_TYPE_USERSPACE_PROBE);
 253
 254         event_rule_status = lttng_event_rule_userspace_probe_get_event_name(
 255                         event_rule, &name);
 256         if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
 257                 ERR("Failed to get uprobe event rule's name.");
 258                 goto end;
 259         }
 260
 261         event_rule_status = lttng_event_rule_userspace_probe_get_location(
 262                         event_rule, &location);
 263         if (event_rule_status != LTTNG_EVENT_RULE_STATUS_OK) {
 264                 ERR("Failed to get uprobe event rule's location.");
 265                 goto end;
 266         }
 267
 268         _MSG("    rule: %s (type: userspace probe, location: ", name);
 269
 270         userspace_probe_location_type =
 271                         lttng_userspace_probe_location_get_type(location);
 272
 273         switch (userspace_probe_location_type) {
 274         case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION:
 275         {
 276                 const char *binary_path, *function_name;
 277
 278                 binary_path = lttng_userspace_probe_location_function_get_binary_path(
 279                                 location);
 280                 function_name = lttng_userspace_probe_location_function_get_function_name(
 281                                 location);
 282
 283                 _MSG("%s:%s", binary_path, function_name);
 284                 break;
 285         }
 286         case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT:
 287                 _MSG("SDT not implemented yet");
 288                 break;
 289         default:
 290                 abort();
 291         }
 292
 293         MSG(")");
 294
 295 end:
 296         return;
 297 }
 298
 299 static
 300 void print_event_rule_syscall(const struct lttng_event_rule *event_rule)
 301 {
 302         const char *pattern, *filter;
 303         enum lttng_event_rule_status event_rule_status;
 304
 305         assert(lttng_event_rule_get_type(event_rule) == LTTNG_EVENT_RULE_TYPE_SYSCALL);
 306
 307         event_rule_status = lttng_event_rule_syscall_get_pattern(
 308                         event_rule, &pattern);
 309         assert(event_rule_status == LTTNG_EVENT_RULE_STATUS_OK);
 310
 311         _MSG("    rule: %s (type: syscall", pattern);
 312
 313         event_rule_status = lttng_event_rule_syscall_get_filter(
 314                         event_rule, &filter);
 315         if (event_rule_status == LTTNG_EVENT_RULE_STATUS_OK) {
 316                 _MSG(", filter: %s", filter);
 317         } else {
 318                 assert(event_rule_status == LTTNG_EVENT_RULE_STATUS_UNSET);
 319         }
 320
 321         MSG(")");
 322 }
 323
 324 static
 325 void print_event_rule(const struct lttng_event_rule *event_rule)
 326 {
 327         const enum lttng_event_rule_type event_rule_type =
 328                         lttng_event_rule_get_type(event_rule);
 329
 330         switch (event_rule_type) {
 331         case LTTNG_EVENT_RULE_TYPE_TRACEPOINT:
 332                 print_event_rule_tracepoint(event_rule);
 333                 break;
 334         case LTTNG_EVENT_RULE_TYPE_KERNEL_PROBE:
 335                 print_event_rule_kernel_probe(event_rule);
 336                 break;
 337         case LTTNG_EVENT_RULE_TYPE_USERSPACE_PROBE:
 338                 print_event_rule_userspace_probe(event_rule);
 339                 break;
 340         case LTTNG_EVENT_RULE_TYPE_SYSCALL:
 341                 print_event_rule_syscall(event_rule);
 342                 break;
 343         default:
 344                 abort();
 345         }
 346 }
 347
 348 static
 349 void print_one_event_expr(const struct lttng_event_expr *event_expr)
 350 {
 351         enum lttng_event_expr_type type;
 352
 353         type = lttng_event_expr_get_type(event_expr);
 354
 355         switch (type) {
 356         case LTTNG_EVENT_EXPR_TYPE_EVENT_PAYLOAD_FIELD:
 357         {
 358                 const char *name;
 359
 360                 name = lttng_event_expr_event_payload_field_get_name(
 361                                 event_expr);
 362                 _MSG("%s", name);
 363
 364                 break;
 365         }
 366         case LTTNG_EVENT_EXPR_TYPE_CHANNEL_CONTEXT_FIELD:
 367         {
 368                 const char *name;
 369
 370                 name = lttng_event_expr_channel_context_field_get_name(
 371                                 event_expr);
 372                 _MSG("$ctx.%s", name);
 373
 374                 break;
 375         }
 376         case LTTNG_EVENT_EXPR_TYPE_APP_SPECIFIC_CONTEXT_FIELD:
 377         {
 378                 const char *provider_name;
 379                 const char *type_name;
 380
 381                 provider_name = lttng_event_expr_app_specific_context_field_get_provider_name(
 382                                 event_expr);
 383                 type_name = lttng_event_expr_app_specific_context_field_get_type_name(
 384                                 event_expr);
 385
 386                 _MSG("$app.%s:%s", provider_name, type_name);
 387
 388                 break;
 389         }
 390         case LTTNG_EVENT_EXPR_TYPE_ARRAY_FIELD_ELEMENT:
 391         {
 392                 unsigned int index;
 393                 const struct lttng_event_expr *parent_expr;
 394                 enum lttng_event_expr_status status;
 395
 396                 parent_expr = lttng_event_expr_array_field_element_get_parent_expr(
 397                                 event_expr);
 398                 assert(parent_expr != NULL);
 399
 400                 print_one_event_expr(parent_expr);
 401
 402                 status = lttng_event_expr_array_field_element_get_index(
 403                                 event_expr, &index);
 404                 assert(status == LTTNG_EVENT_EXPR_STATUS_OK);
 405
 406                 _MSG("[%u]", index);
 407
 408                 break;
 409         }
 410         default:
 411                 abort();
 412         }
 413 }
 414
 415 static
 416 void print_condition_on_event(const struct lttng_condition *condition)
 417 {
 418         const struct lttng_event_rule *event_rule;
 419         enum lttng_condition_status condition_status;
 420         unsigned int cap_desc_count, i;
 421         uint64_t error_count;
 422
 423         condition_status =
 424                 lttng_condition_on_event_get_rule(condition, &event_rule);
 425         assert(condition_status == LTTNG_CONDITION_STATUS_OK);
 426
 427         print_event_rule(event_rule);
 428
 429         condition_status =
 430                         lttng_condition_on_event_get_capture_descriptor_count(
 431                                         condition, &cap_desc_count);
 432         assert(condition_status == LTTNG_CONDITION_STATUS_OK);
 433
 434         error_count = lttng_condition_on_event_get_error_count(condition);
 435         MSG("    tracer notifications discarded: %" PRIu64, error_count);
 436
 437         if (cap_desc_count > 0) {
 438                 MSG("    captures:");
 439
 440                 for (i = 0; i < cap_desc_count; i++) {
 441                         const struct lttng_event_expr *cap_desc =
 442                                         lttng_condition_on_event_get_capture_descriptor_at_index(
 443                                                         condition, i);
 444
 445                         _MSG("      - ");
 446                         print_one_event_expr(cap_desc);
 447                         MSG("");
 448                 }
 449         }
 450 }
 451
 452 static
 453 void print_one_action(const struct lttng_action *action)
 454 {
 455         enum lttng_action_type action_type;
 456         enum lttng_action_status action_status;
 457         const char *value;
 458
 459         action_type = lttng_action_get_type(action);
 460         assert(action_type != LTTNG_ACTION_TYPE_GROUP);
 461
 462         switch (action_type) {
 463         case LTTNG_ACTION_TYPE_NOTIFY:
 464                 MSG("notify");
 465                 break;
 466         case LTTNG_ACTION_TYPE_START_SESSION:
 467                 action_status = lttng_action_start_session_get_session_name(
 468                                 action, &value);
 469                 assert(action_status == LTTNG_ACTION_STATUS_OK);
 470                 MSG("start session `%s`", value);
 471                 break;
 472         case LTTNG_ACTION_TYPE_STOP_SESSION:
 473                 action_status = lttng_action_stop_session_get_session_name(
 474                                 action, &value);
 475                 assert(action_status == LTTNG_ACTION_STATUS_OK);
 476                 MSG("stop session `%s`", value);
 477                 break;
 478         case LTTNG_ACTION_TYPE_ROTATE_SESSION:
 479                 action_status = lttng_action_rotate_session_get_session_name(
 480                                 action, &value);
 481                 assert(action_status == LTTNG_ACTION_STATUS_OK);
 482                 MSG("rotate session `%s`", value);
 483                 break;
 484         case LTTNG_ACTION_TYPE_SNAPSHOT_SESSION:
 485         {
 486                 const struct lttng_snapshot_output *output;
 487
 488                 action_status = lttng_action_snapshot_session_get_session_name(
 489                                 action, &value);
 490                 assert(action_status == LTTNG_ACTION_STATUS_OK);
 491                 _MSG("snapshot session `%s`", value);
 492
 493                 action_status = lttng_action_snapshot_session_get_output(
 494                                 action, &output);
 495                 if (action_status == LTTNG_ACTION_STATUS_OK) {
 496                         const char *name;
 497                         uint64_t max_size;
 498                         const char *ctrl_url, *data_url;
 499                         bool starts_with_file, starts_with_net, starts_with_net6;
 500
 501                         ctrl_url = lttng_snapshot_output_get_ctrl_url(output);
 502                         assert(ctrl_url && strlen(ctrl_url) > 0);
 503
 504                         data_url = lttng_snapshot_output_get_data_url(output);
 505                         assert(data_url);
 506
 507                         starts_with_file = strncmp(ctrl_url, "file://", strlen("file://")) == 0;
 508                         starts_with_net = strncmp(ctrl_url, "net://", strlen("net://")) == 0;
 509                         starts_with_net6 = strncmp(ctrl_url, "net6://", strlen("net6://")) == 0;
 510
 511                         if (ctrl_url[0] == '/' || starts_with_file) {
 512                                 if (starts_with_file) {
 513                                         ctrl_url += strlen("file://");
 514                                 }
 515
 516                                 _MSG(", path: %s", ctrl_url);
 517                         } else if (starts_with_net || starts_with_net6) {
 518                                 _MSG(", url: %s", ctrl_url);
 519                         } else {
 520                                 assert(strlen(data_url) > 0);
 521
 522                                 _MSG(", control url: %s, data url: %s", ctrl_url, data_url);
 523                         }
 524
 525                         name = lttng_snapshot_output_get_name(output);
 526                         assert(name);
 527                         if (strlen(name) > 0) {
 528                                 _MSG(", name: %s", name);
 529                         }
 530
 531                         max_size = lttng_snapshot_output_get_maxsize(output);
 532                         if (max_size != -1ULL) {
 533                                 _MSG(", max size: %" PRIu64, max_size);
 534                         }
 535                 }
 536
 537                 MSG("");
 538                 break;
 539         }
 540
 541         default:
 542                 abort();
 543         }
 544 }
 545
 546 static
 547 void print_one_trigger(const struct lttng_trigger *trigger)
 548 {
 549         const struct lttng_condition *condition;
 550         enum lttng_condition_type condition_type;
 551         const struct lttng_action *action;
 552         enum lttng_action_type action_type;
 553         enum lttng_trigger_status trigger_status;
 554         const char *name;
 555         enum lttng_trigger_firing_policy firing_policy_type;
 556         uint64_t threshold;
 557         uid_t trigger_uid;
 558
 559         trigger_status = lttng_trigger_get_name(trigger, &name);
 560         assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
 561
 562         trigger_status = lttng_trigger_get_owner_uid(trigger, &trigger_uid);
 563         assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
 564
 565         MSG("- id: %s", name);
 566         MSG("  user id: %d", trigger_uid);
 567
 568         trigger_status = lttng_trigger_get_firing_policy(
 569                         trigger, &firing_policy_type, &threshold);
 570         if (trigger_status != LTTNG_TRIGGER_STATUS_OK) {
 571                 ERR("Failed to get trigger's policy.");
 572                 goto end;
 573         }
 574
 575         switch (firing_policy_type) {
 576         case LTTNG_TRIGGER_FIRING_POLICY_EVERY_N:
 577                 if (threshold > 1) {
 578                         MSG("  firing policy: after every %" PRIu64 " occurences", threshold);
 579                 }
 580                 break;
 581         case LTTNG_TRIGGER_FIRING_POLICY_ONCE_AFTER_N:
 582                 MSG("  firing policy: once after %" PRIu64 " occurences", threshold);
 583                 break;
 584         default:
 585                 abort();
 586         }
 587
 588         condition = lttng_trigger_get_const_condition(trigger);
 589         condition_type = lttng_condition_get_type(condition);
 590         MSG("  condition: %s", lttng_condition_type_str(condition_type));
 591         switch (condition_type) {
 592         case LTTNG_CONDITION_TYPE_ON_EVENT:
 593                 print_condition_on_event(condition);
 594                 break;
 595         default:
 596                 MSG("  (condition type not handled in %s)", __func__);
 597                 break;
 598         }
 599
 600         action = lttng_trigger_get_const_action(trigger);
 601         action_type = lttng_action_get_type(action);
 602         if (action_type == LTTNG_ACTION_TYPE_GROUP) {
 603                 unsigned int count, i;
 604                 enum lttng_action_status action_status;
 605
 606                 MSG("  actions:");
 607
 608                 action_status = lttng_action_group_get_count(action, &count);
 609                 assert(action_status == LTTNG_ACTION_STATUS_OK);
 610
 611                 for (i = 0; i < count; i++) {
 612                         const struct lttng_action *subaction =
 613                                         lttng_action_group_get_at_index(
 614                                                         action, i);
 615
 616                         _MSG("    ");
 617                         print_one_action(subaction);
 618                 }
 619         } else {
 620                 _MSG(" action:");
 621                 print_one_action(action);
 622         }
 623
 624 end:
 625         return;
 626 }
 627
 628 static
 629 int compare_triggers_by_name(const void *a, const void *b)
 630 {
 631         const struct lttng_trigger *trigger_a = *((const struct lttng_trigger **) a);
 632         const struct lttng_trigger *trigger_b = *((const struct lttng_trigger **) b);
 633         const char *name_a, *name_b;
 634         enum lttng_trigger_status trigger_status;
 635
 636         trigger_status = lttng_trigger_get_name(trigger_a, &name_a);
 637         assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
 638
 639         trigger_status = lttng_trigger_get_name(trigger_b, &name_b);
 640         assert(trigger_status == LTTNG_TRIGGER_STATUS_OK);
 641
 642         return strcmp(name_a, name_b);
 643 }
 644
 645 int cmd_list_triggers(int argc, const char **argv)
 646 {
 647         int ret;
 648         struct argpar_parse_ret argpar_parse_ret = {};
 649         struct lttng_triggers *triggers = NULL;
 650         int i;
 651         struct lttng_dynamic_pointer_array sorted_triggers;
 652         enum lttng_trigger_status trigger_status;
 653         unsigned int num_triggers;
 654
 655         lttng_dynamic_pointer_array_init(&sorted_triggers, NULL);
 656
 657         argpar_parse_ret = argpar_parse(
 658                         argc - 1, argv + 1, list_trigger_options, true);
 659         if (!argpar_parse_ret.items) {
 660                 ERR("%s", argpar_parse_ret.error);
 661                 goto error;
 662         }
 663
 664         for (i = 0; i < argpar_parse_ret.items->n_items; i++) {
 665                 const struct argpar_item *item =
 666                                 argpar_parse_ret.items->items[i];
 667
 668                 if (item->type == ARGPAR_ITEM_TYPE_OPT) {
 669                         const struct argpar_item_opt *item_opt =
 670                                         (const struct argpar_item_opt *) item;
 671
 672                         switch (item_opt->descr->id) {
 673                         case OPT_HELP:
 674                                 SHOW_HELP();
 675                                 ret = 0;
 676                                 goto end;
 677
 678                         case OPT_LIST_OPTIONS:
 679                                 list_cmd_options_argpar(stdout,
 680                                         list_trigger_options);
 681                                 ret = 0;
 682                                 goto end;
 683
 684                         default:
 685                                 abort();
 686                         }
 687
 688                 } else {
 689                         const struct argpar_item_non_opt *item_non_opt =
 690                                 (const struct argpar_item_non_opt *) item;
 691
 692                         ERR("Unexpected argument: %s", item_non_opt->arg);
 693                 }
 694         }
 695
 696         ret = lttng_list_triggers(&triggers);
 697         if (ret != LTTNG_OK) {
 698                 ERR("Error listing triggers: %s.", lttng_strerror(-ret));
 699                 goto error;
 700         }
 701
 702         trigger_status = lttng_triggers_get_count(triggers, &num_triggers);
 703         if (trigger_status != LTTNG_TRIGGER_STATUS_OK) {
 704                 ERR("Failed to get trigger count.");
 705                 goto error;
 706         }
 707
 708         for (i = 0; i < num_triggers; i++) {
 709                 const int add_ret = lttng_dynamic_pointer_array_add_pointer(
 710                                 &sorted_triggers,
 711                                 (void *) lttng_triggers_get_at_index(triggers, i));
 712
 713                 if (add_ret) {
 714                         ERR("Failed to allocate array of struct lttng_trigger *.");
 715                         goto error;
 716                 }
 717         }
 718
 719         qsort(sorted_triggers.array.buffer.data, num_triggers,
 720                         sizeof(struct lttng_trigger *),
 721                         compare_triggers_by_name);
 722
 723         for (i = 0; i < num_triggers; i++) {
 724                 const struct lttng_trigger *trigger_to_print =
 725                                 (const struct lttng_trigger *)
 726                                 lttng_dynamic_pointer_array_get_pointer(
 727                                                 &sorted_triggers, i);
 728
 729                 print_one_trigger(trigger_to_print);
 730         }
 731
 732         ret = 0;
 733         goto end;
 734
 735 error:
 736         ret = 1;
 737
 738 end:
 739         argpar_parse_ret_fini(&argpar_parse_ret);
 740         lttng_triggers_destroy(triggers);
 741         lttng_dynamic_pointer_array_reset(&sorted_triggers);
 742
 743         return ret;
 744 }