src/bin/lttng/commands/list.c

   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 #define _GNU_SOURCE
  19 #include <inttypes.h>
  20 #include <popt.h>
  21 #include <stdio.h>
  22 #include <stdlib.h>
  23 #include <string.h>
  24 #include <assert.h>
  25
  26 #include "../command.h"
  27
  28 static int opt_userspace;
  29 static int opt_kernel;
  30 static char *opt_channel;
  31 static int opt_domain;
  32 static int opt_fields;
  33 #if 0
  34 /* Not implemented yet */
  35 static char *opt_cmd_name;
  36 static pid_t opt_pid;
  37 #endif
  38
  39 const char *indent4 = "    ";
  40 const char *indent6 = "      ";
  41 const char *indent8 = "        ";
  42
  43 enum {
  44         OPT_HELP = 1,
  45         OPT_USERSPACE,
  46         OPT_LIST_OPTIONS,
  47 };
  48
  49 static struct lttng_handle *handle;
  50
  51 static struct poptOption long_options[] = {
  52         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  53         {"help",      'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
  54         {"kernel",    'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
  55 #if 0
  56         /* Not implemented yet */
  57         {"userspace",      'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_cmd_name, OPT_USERSPACE, 0, 0},
  58         {"pid",            'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
  59 #else
  60         {"userspace",      'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
  61 #endif
  62         {"channel",   'c', POPT_ARG_STRING, &opt_channel, 0, 0, 0},
  63         {"domain",    'd', POPT_ARG_VAL, &opt_domain, 1, 0, 0},
  64         {"fields",    'f', POPT_ARG_VAL, &opt_fields, 1, 0, 0},
  65         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  66         {0, 0, 0, 0, 0, 0, 0}
  67 };
  68
  69 /*
  70  * usage
  71  */
  72 static void usage(FILE *ofp)
  73 {
  74         fprintf(ofp, "usage: lttng list [OPTIONS] [SESSION [<OPTIONS>]]\n");
  75         fprintf(ofp, "\n");
  76         fprintf(ofp, "With no arguments, list available tracing session(s)\n");
  77         fprintf(ofp, "\n");
  78         fprintf(ofp, "Without a session, -k lists available kernel events\n");
  79         fprintf(ofp, "Without a session, -u lists available userspace events\n");
  80         fprintf(ofp, "\n");
  81         fprintf(ofp, "  -h, --help              Show this help\n");
  82         fprintf(ofp, "      --list-options      Simple listing of options\n");
  83         fprintf(ofp, "  -k, --kernel            Select kernel domain\n");
  84         fprintf(ofp, "  -u, --userspace         Select user-space domain.\n");
  85         fprintf(ofp, "  -f, --fields            List event fields.\n");
  86 #if 0
  87         fprintf(ofp, "  -p, --pid PID           List user-space events by PID\n");
  88 #endif
  89         fprintf(ofp, "\n");
  90         fprintf(ofp, "Session Options:\n");
  91         fprintf(ofp, "  -c, --channel NAME      List details of a channel\n");
  92         fprintf(ofp, "  -d, --domain            List available domain(s)\n");
  93         fprintf(ofp, "\n");
  94 }
  95
  96 /*
  97  * Get command line from /proc for a specific pid.
  98  *
  99  * On success, return an allocated string pointer to the proc cmdline.
 100  * On error, return NULL.
 101  */
 102 static char *get_cmdline_by_pid(pid_t pid)
 103 {
 104         int ret;
 105         FILE *fp;
 106         char *cmdline = NULL;
 107         char path[24];  /* Can't go bigger than /proc/65535/cmdline */
 108
 109         snprintf(path, sizeof(path), "/proc/%d/cmdline", pid);
 110         fp = fopen(path, "r");
 111         if (fp == NULL) {
 112                 goto end;
 113         }
 114
 115         /* Caller must free() *cmdline */
 116         cmdline = malloc(PATH_MAX);
 117         ret = fread(cmdline, 1, PATH_MAX, fp);
 118         if (ret < 0) {
 119                 perror("fread proc list");
 120         }
 121         fclose(fp);
 122
 123 end:
 124         return cmdline;
 125 }
 126
 127 static
 128 const char *active_string(int value)
 129 {
 130         switch (value) {
 131         case 0: return " [inactive]";
 132         case 1: return " [active]";
 133         case -1: return "";
 134         default: return NULL;
 135         }
 136 }
 137
 138 static
 139 const char *enabled_string(int value)
 140 {
 141         switch (value) {
 142         case 0: return " [disabled]";
 143         case 1: return " [enabled]";
 144         case -1: return "";
 145         default: return NULL;
 146         }
 147 }
 148
 149 static const char *loglevel_string(int value)
 150 {
 151         switch (value) {
 152         case -1:
 153                 return "";
 154         case LTTNG_LOGLEVEL_EMERG:
 155                 return "TRACE_EMERG";
 156         case LTTNG_LOGLEVEL_ALERT:
 157                 return "TRACE_ALERT";
 158         case LTTNG_LOGLEVEL_CRIT:
 159                 return "TRACE_CRIT";
 160         case LTTNG_LOGLEVEL_ERR:
 161                 return "TRACE_ERR";
 162         case LTTNG_LOGLEVEL_WARNING:
 163                 return "TRACE_WARNING";
 164         case LTTNG_LOGLEVEL_NOTICE:
 165                 return "TRACE_NOTICE";
 166         case LTTNG_LOGLEVEL_INFO:
 167                 return "TRACE_INFO";
 168         case LTTNG_LOGLEVEL_DEBUG_SYSTEM:
 169                 return "TRACE_DEBUG_SYSTEM";
 170         case LTTNG_LOGLEVEL_DEBUG_PROGRAM:
 171                 return "TRACE_DEBUG_PROGRAM";
 172         case LTTNG_LOGLEVEL_DEBUG_PROCESS:
 173                 return "TRACE_DEBUG_PROCESS";
 174         case LTTNG_LOGLEVEL_DEBUG_MODULE:
 175                 return "TRACE_DEBUG_MODULE";
 176         case LTTNG_LOGLEVEL_DEBUG_UNIT:
 177                 return "TRACE_DEBUG_UNIT";
 178         case LTTNG_LOGLEVEL_DEBUG_FUNCTION:
 179                 return "TRACE_DEBUG_FUNCTION";
 180         case LTTNG_LOGLEVEL_DEBUG_LINE:
 181                 return "TRACE_DEBUG_LINE";
 182         case LTTNG_LOGLEVEL_DEBUG:
 183                 return "TRACE_DEBUG";
 184         default:
 185                 return "<<UNKNOWN>>";
 186         }
 187 }
 188
 189 /*
 190  * Pretty print single event.
 191  */
 192 static void print_events(struct lttng_event *event)
 193 {
 194         switch (event->type) {
 195         case LTTNG_EVENT_TRACEPOINT:
 196         {
 197                 if (event->loglevel != -1) {
 198                         MSG("%s%s (loglevel: %s (%d)) (type: tracepoint)%s",
 199                                 indent6,
 200                                 event->name,
 201                                 loglevel_string(event->loglevel),
 202                                 event->loglevel,
 203                                 enabled_string(event->enabled));
 204                 } else {
 205                         MSG("%s%s (type: tracepoint)%s",
 206                                 indent6,
 207                                 event->name,
 208                                 enabled_string(event->enabled));
 209                 }
 210                 break;
 211         }
 212         case LTTNG_EVENT_PROBE:
 213                 MSG("%s%s (type: probe)%s", indent6,
 214                                 event->name, enabled_string(event->enabled));
 215                 if (event->attr.probe.addr != 0) {
 216                         MSG("%saddr: 0x%" PRIx64, indent8, event->attr.probe.addr);
 217                 } else {
 218                         MSG("%soffset: 0x%" PRIx64, indent8, event->attr.probe.offset);
 219                         MSG("%ssymbol: %s", indent8, event->attr.probe.symbol_name);
 220                 }
 221                 break;
 222         case LTTNG_EVENT_FUNCTION:
 223         case LTTNG_EVENT_FUNCTION_ENTRY:
 224                 MSG("%s%s (type: function)%s", indent6,
 225                                 event->name, enabled_string(event->enabled));
 226                 MSG("%ssymbol: \"%s\"", indent8, event->attr.ftrace.symbol_name);
 227                 break;
 228         case LTTNG_EVENT_SYSCALL:
 229                 MSG("%ssyscalls (type: syscall)%s", indent6,
 230                                 enabled_string(event->enabled));
 231                 break;
 232         case LTTNG_EVENT_NOOP:
 233                 MSG("%s (type: noop)%s", indent6,
 234                                 enabled_string(event->enabled));
 235                 break;
 236         case LTTNG_EVENT_ALL:
 237                 /* We should never have "all" events in list. */
 238                 assert(0);
 239                 break;
 240         }
 241 }
 242
 243 static const char *field_type(struct lttng_event_field *field)
 244 {
 245         switch(field->type) {
 246         case LTTNG_EVENT_FIELD_INTEGER:
 247                 return "integer";
 248         case LTTNG_EVENT_FIELD_ENUM:
 249                 return "enum";
 250         case LTTNG_EVENT_FIELD_FLOAT:
 251                 return "float";
 252         case LTTNG_EVENT_FIELD_STRING:
 253                 return "string";
 254         case LTTNG_EVENT_FIELD_OTHER:
 255         default:        /* fall-through */
 256                 return "unknown";
 257         }
 258 }
 259
 260 /*
 261  * Pretty print single event fields.
 262  */
 263 static void print_event_field(struct lttng_event_field *field)
 264 {
 265         if (!field->field_name[0]) {
 266                 return;
 267         }
 268         MSG("%sfield: %s (%s)", indent6, field->field_name,
 269                 field_type(field));
 270 }
 271
 272 /*
 273  * Ask session daemon for all user space tracepoints available.
 274  */
 275 static int list_ust_events(void)
 276 {
 277         int i, size;
 278         struct lttng_domain domain;
 279         struct lttng_handle *handle;
 280         struct lttng_event *event_list;
 281         pid_t cur_pid = 0;
 282
 283         memset(&domain, 0, sizeof(domain));
 284
 285         DBG("Getting UST tracing events");
 286
 287         domain.type = LTTNG_DOMAIN_UST;
 288
 289         handle = lttng_create_handle(NULL, &domain);
 290         if (handle == NULL) {
 291                 goto error;
 292         }
 293
 294         size = lttng_list_tracepoints(handle, &event_list);
 295         if (size < 0) {
 296                 ERR("Unable to list UST events");
 297                 lttng_destroy_handle(handle);
 298                 return size;
 299         }
 300
 301         MSG("UST events:\n-------------");
 302
 303         if (size == 0) {
 304                 MSG("None");
 305         }
 306
 307         for (i = 0; i < size; i++) {
 308                 if (cur_pid != event_list[i].pid) {
 309                         cur_pid = event_list[i].pid;
 310                         MSG("\nPID: %d - Name: %s", cur_pid, get_cmdline_by_pid(cur_pid));
 311                 }
 312                 print_events(&event_list[i]);
 313         }
 314
 315         MSG("");
 316
 317         free(event_list);
 318         lttng_destroy_handle(handle);
 319
 320         return CMD_SUCCESS;
 321
 322 error:
 323         lttng_destroy_handle(handle);
 324         return -1;
 325 }
 326
 327 /*
 328  * Ask session daemon for all user space tracepoint fields available.
 329  */
 330 static int list_ust_event_fields(void)
 331 {
 332         int i, size;
 333         struct lttng_domain domain;
 334         struct lttng_handle *handle;
 335         struct lttng_event_field *event_field_list;
 336         pid_t cur_pid = 0;
 337         struct lttng_event cur_event;
 338
 339         memset(&domain, 0, sizeof(domain));
 340         memset(&cur_event, 0, sizeof(cur_event));
 341
 342         DBG("Getting UST tracing event fields");
 343
 344         domain.type = LTTNG_DOMAIN_UST;
 345
 346         handle = lttng_create_handle(NULL, &domain);
 347         if (handle == NULL) {
 348                 goto error;
 349         }
 350
 351         size = lttng_list_tracepoint_fields(handle, &event_field_list);
 352         if (size < 0) {
 353                 ERR("Unable to list UST event fields");
 354                 lttng_destroy_handle(handle);
 355                 return size;
 356         }
 357
 358         MSG("UST events:\n-------------");
 359
 360         if (size == 0) {
 361                 MSG("None");
 362         }
 363
 364         for (i = 0; i < size; i++) {
 365                 if (cur_pid != event_field_list[i].event.pid) {
 366                         cur_pid = event_field_list[i].event.pid;
 367                         MSG("\nPID: %d - Name: %s", cur_pid, get_cmdline_by_pid(cur_pid));
 368                 }
 369                 if (strcmp(cur_event.name, event_field_list[i].event.name) != 0) {
 370                         print_events(&event_field_list[i].event);
 371                         memcpy(&cur_event, &event_field_list[i].event,
 372                                 sizeof(cur_event));
 373                 }
 374                 print_event_field(&event_field_list[i]);
 375         }
 376
 377         MSG("");
 378
 379         free(event_field_list);
 380         lttng_destroy_handle(handle);
 381
 382         return CMD_SUCCESS;
 383
 384 error:
 385         lttng_destroy_handle(handle);
 386         return -1;
 387 }
 388
 389 /*
 390  * Ask for all trace events in the kernel and pretty print them.
 391  */
 392 static int list_kernel_events(void)
 393 {
 394         int i, size;
 395         struct lttng_domain domain;
 396         struct lttng_handle *handle;
 397         struct lttng_event *event_list;
 398
 399         memset(&domain, 0, sizeof(domain));
 400
 401         DBG("Getting kernel tracing events");
 402
 403         domain.type = LTTNG_DOMAIN_KERNEL;
 404
 405         handle = lttng_create_handle(NULL, &domain);
 406         if (handle == NULL) {
 407                 goto error;
 408         }
 409
 410         size = lttng_list_tracepoints(handle, &event_list);
 411         if (size < 0) {
 412                 ERR("Unable to list kernel events");
 413                 lttng_destroy_handle(handle);
 414                 return size;
 415         }
 416
 417         MSG("Kernel events:\n-------------");
 418
 419         for (i = 0; i < size; i++) {
 420                 print_events(&event_list[i]);
 421         }
 422
 423         MSG("");
 424
 425         free(event_list);
 426
 427         lttng_destroy_handle(handle);
 428         return CMD_SUCCESS;
 429
 430 error:
 431         lttng_destroy_handle(handle);
 432         return -1;
 433 }
 434
 435 /*
 436  * List events of channel of session and domain.
 437  */
 438 static int list_events(const char *channel_name)
 439 {
 440         int ret, count, i;
 441         struct lttng_event *events = NULL;
 442
 443         count = lttng_list_events(handle, channel_name, &events);
 444         if (count < 0) {
 445                 ret = count;
 446                 goto error;
 447         }
 448
 449         MSG("\n%sEvents:", indent4);
 450         if (count == 0) {
 451                 MSG("%sNone\n", indent6);
 452                 goto end;
 453         }
 454
 455         for (i = 0; i < count; i++) {
 456                 print_events(&events[i]);
 457         }
 458
 459         MSG("");
 460
 461 end:
 462         if (events) {
 463                 free(events);
 464         }
 465         ret = CMD_SUCCESS;
 466
 467 error:
 468         return ret;
 469 }
 470
 471 /*
 472  * Pretty print channel
 473  */
 474 static void print_channel(struct lttng_channel *channel)
 475 {
 476         MSG("- %s:%s\n", channel->name, enabled_string(channel->enabled));
 477
 478         MSG("%sAttributes:", indent4);
 479         MSG("%soverwrite mode: %d", indent6, channel->attr.overwrite);
 480         MSG("%ssubbufers size: %" PRIu64, indent6, channel->attr.subbuf_size);
 481         MSG("%snumber of subbufers: %" PRIu64, indent6, channel->attr.num_subbuf);
 482         MSG("%sswitch timer interval: %u", indent6, channel->attr.switch_timer_interval);
 483         MSG("%sread timer interval: %u", indent6, channel->attr.read_timer_interval);
 484         switch (channel->attr.output) {
 485                 case LTTNG_EVENT_SPLICE:
 486                         MSG("%soutput: splice()", indent6);
 487                         break;
 488                 case LTTNG_EVENT_MMAP:
 489                         MSG("%soutput: mmap()", indent6);
 490                         break;
 491         }
 492 }
 493
 494 /*
 495  * List channel(s) of session and domain.
 496  *
 497  * If channel_name is NULL, all channels are listed.
 498  */
 499 static int list_channels(const char *channel_name)
 500 {
 501         int count, i, ret = CMD_SUCCESS;
 502         unsigned int chan_found = 0;
 503         struct lttng_channel *channels = NULL;
 504
 505         DBG("Listing channel(s) (%s)", channel_name ? : "<all>");
 506
 507         count = lttng_list_channels(handle, &channels);
 508         if (count < 0) {
 509                 ret = count;
 510                 goto error_channels;
 511         } else if (count == 0) {
 512                 ERR("Channel %s not found", channel_name);
 513                 goto error;
 514         }
 515
 516         if (channel_name == NULL) {
 517                 MSG("Channels:\n-------------");
 518         }
 519
 520         for (i = 0; i < count; i++) {
 521                 if (channel_name != NULL) {
 522                         if (strncmp(channels[i].name, channel_name, NAME_MAX) == 0) {
 523                                 chan_found = 1;
 524                         } else {
 525                                 continue;
 526                         }
 527                 }
 528                 print_channel(&channels[i]);
 529
 530                 /* Listing events per channel */
 531                 ret = list_events(channels[i].name);
 532                 if (ret < 0) {
 533                         MSG("%s", lttng_strerror(ret));
 534                 }
 535
 536                 if (chan_found) {
 537                         break;
 538                 }
 539         }
 540
 541         if (!chan_found && channel_name != NULL) {
 542                 ERR("Channel %s not found", channel_name);
 543                 goto error;
 544         }
 545
 546         ret = CMD_SUCCESS;
 547
 548 error:
 549         free(channels);
 550
 551 error_channels:
 552         return ret;
 553 }
 554
 555 /*
 556  * List available tracing session. List only basic information.
 557  *
 558  * If session_name is NULL, all sessions are listed.
 559  */
 560 static int list_sessions(const char *session_name)
 561 {
 562         int ret, count, i;
 563         unsigned int session_found = 0;
 564         struct lttng_session *sessions;
 565
 566         count = lttng_list_sessions(&sessions);
 567         DBG("Session count %d", count);
 568         if (count < 0) {
 569                 ret = count;
 570                 goto error;
 571         } else if (count == 0) {
 572                 MSG("Currently no available tracing session");
 573                 goto end;
 574         }
 575
 576         if (session_name == NULL) {
 577                 MSG("Available tracing sessions:");
 578         }
 579
 580         for (i = 0; i < count; i++) {
 581                 if (session_name != NULL) {
 582                         if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
 583                                 session_found = 1;
 584                                 MSG("Tracing session %s:%s", session_name, active_string(sessions[i].enabled));
 585                                 MSG("%sTrace path: %s\n", indent4, sessions[i].path);
 586                                 break;
 587                         }
 588                         continue;
 589                 }
 590
 591                 MSG("  %d) %s (%s)%s", i + 1, sessions[i].name, sessions[i].path,
 592                                 active_string(sessions[i].enabled));
 593
 594                 if (session_found) {
 595                         break;
 596                 }
 597         }
 598
 599         free(sessions);
 600
 601         if (!session_found && session_name != NULL) {
 602                 ERR("Session '%s' not found", session_name);
 603                 ret = CMD_ERROR;
 604                 goto error;
 605         }
 606
 607         if (session_name == NULL) {
 608                 MSG("\nUse lttng list <session_name> for more details");
 609         }
 610
 611 end:
 612         return CMD_SUCCESS;
 613
 614 error:
 615         return ret;
 616 }
 617
 618 /*
 619  * List available domain(s) for a session.
 620  */
 621 static int list_domains(const char *session_name)
 622 {
 623         int i, count, ret = CMD_SUCCESS;
 624         struct lttng_domain *domains = NULL;
 625
 626         MSG("Domains:\n-------------");
 627
 628         count = lttng_list_domains(session_name, &domains);
 629         if (count < 0) {
 630                 ret = count;
 631                 goto error;
 632         } else if (count == 0) {
 633                 MSG("  None");
 634                 goto end;
 635         }
 636
 637         for (i = 0; i < count; i++) {
 638                 switch (domains[i].type) {
 639                 case LTTNG_DOMAIN_KERNEL:
 640                         MSG("  - Kernel");
 641                         break;
 642                 case LTTNG_DOMAIN_UST:
 643                         MSG("  - UST global");
 644                         break;
 645                 default:
 646                         break;
 647                 }
 648         }
 649
 650 end:
 651         free(domains);
 652
 653 error:
 654         return ret;
 655 }
 656
 657 /*
 658  * The 'list <options>' first level command
 659  */
 660 int cmd_list(int argc, const char **argv)
 661 {
 662         int opt, i, ret = CMD_SUCCESS;
 663         int nb_domain;
 664         const char *session_name;
 665         static poptContext pc;
 666         struct lttng_domain domain;
 667         struct lttng_domain *domains = NULL;
 668
 669         memset(&domain, 0, sizeof(domain));
 670
 671         if (argc < 1) {
 672                 usage(stderr);
 673                 ret = CMD_ERROR;
 674                 goto end;
 675         }
 676
 677         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 678         poptReadDefaultConfig(pc, 0);
 679
 680         while ((opt = poptGetNextOpt(pc)) != -1) {
 681                 switch (opt) {
 682                 case OPT_HELP:
 683                         usage(stdout);
 684                         goto end;
 685                 case OPT_USERSPACE:
 686                         opt_userspace = 1;
 687                         break;
 688                 case OPT_LIST_OPTIONS:
 689                         list_cmd_options(stdout, long_options);
 690                         goto end;
 691                 default:
 692                         usage(stderr);
 693                         ret = CMD_UNDEFINED;
 694                         goto end;
 695                 }
 696         }
 697
 698         /* Get session name (trailing argument) */
 699         session_name = poptGetArg(pc);
 700         DBG2("Session name: %s", session_name);
 701
 702         if (opt_kernel) {
 703                 domain.type = LTTNG_DOMAIN_KERNEL;
 704         } else if (opt_userspace) {
 705                 DBG2("Listing userspace global domain");
 706                 domain.type = LTTNG_DOMAIN_UST;
 707         }
 708
 709         if (opt_kernel || opt_userspace) {
 710                 handle = lttng_create_handle(session_name, &domain);
 711                 if (handle == NULL) {
 712                         ret = CMD_FATAL;
 713                         goto end;
 714                 }
 715         }
 716
 717         if (session_name == NULL) {
 718                 if (!opt_kernel && !opt_userspace) {
 719                         ret = list_sessions(NULL);
 720                         if (ret != 0) {
 721                                 goto end;
 722                         }
 723                 }
 724                 if (opt_kernel) {
 725                         ret = list_kernel_events();
 726                         if (ret < 0) {
 727                                 goto end;
 728                         }
 729                 }
 730                 if (opt_userspace) {
 731                         if (opt_fields) {
 732                                 ret = list_ust_event_fields();
 733                         } else {
 734                                 ret = list_ust_events();
 735                         }
 736                         if (ret < 0) {
 737                                 goto end;
 738                         }
 739                 }
 740         } else {
 741                 /* List session attributes */
 742                 ret = list_sessions(session_name);
 743                 if (ret != 0) {
 744                         goto end;
 745                 }
 746
 747                 /* Domain listing */
 748                 if (opt_domain) {
 749                         ret = list_domains(session_name);
 750                         goto end;
 751                 }
 752
 753                 if (opt_kernel) {
 754                         /* Channel listing */
 755                         ret = list_channels(opt_channel);
 756                         if (ret < 0) {
 757                                 goto end;
 758                         }
 759                 } else {
 760                         /* We want all domain(s) */
 761                         nb_domain = lttng_list_domains(session_name, &domains);
 762                         if (nb_domain < 0) {
 763                                 ret = nb_domain;
 764                                 goto end;
 765                         }
 766
 767                         for (i = 0; i < nb_domain; i++) {
 768                                 switch (domains[i].type) {
 769                                 case LTTNG_DOMAIN_KERNEL:
 770                                         MSG("=== Domain: Kernel ===\n");
 771                                         break;
 772                                 case LTTNG_DOMAIN_UST:
 773                                         MSG("=== Domain: UST global ===\n");
 774                                         break;
 775                                 default:
 776                                         MSG("=== Domain: Unimplemented ===\n");
 777                                         break;
 778                                 }
 779
 780                                 /* Clean handle before creating a new one */
 781                                 if (handle) {
 782                                         lttng_destroy_handle(handle);
 783                                 }
 784
 785                                 handle = lttng_create_handle(session_name, &domains[i]);
 786                                 if (handle == NULL) {
 787                                         ret = CMD_FATAL;
 788                                         goto end;
 789                                 }
 790
 791                                 ret = list_channels(opt_channel);
 792                                 if (ret < 0) {
 793                                         goto end;
 794                                 }
 795                         }
 796                 }
 797         }
 798
 799 end:
 800         if (domains) {
 801                 free(domains);
 802         }
 803         if (handle) {
 804                 lttng_destroy_handle(handle);
 805         }
 806
 807         poptFreeContext(pc);
 808         return ret;
 809 }