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
 150 const char *filter_string(int value)
 151 {
 152         switch (value) {
 153         case 1: return " [with filter]";
 154         default: return "";
 155         }
 156 }
 157
 158 static const char *loglevel_string(int value)
 159 {
 160         switch (value) {
 161         case -1:
 162                 return "";
 163         case LTTNG_LOGLEVEL_EMERG:
 164                 return "TRACE_EMERG";
 165         case LTTNG_LOGLEVEL_ALERT:
 166                 return "TRACE_ALERT";
 167         case LTTNG_LOGLEVEL_CRIT:
 168                 return "TRACE_CRIT";
 169         case LTTNG_LOGLEVEL_ERR:
 170                 return "TRACE_ERR";
 171         case LTTNG_LOGLEVEL_WARNING:
 172                 return "TRACE_WARNING";
 173         case LTTNG_LOGLEVEL_NOTICE:
 174                 return "TRACE_NOTICE";
 175         case LTTNG_LOGLEVEL_INFO:
 176                 return "TRACE_INFO";
 177         case LTTNG_LOGLEVEL_DEBUG_SYSTEM:
 178                 return "TRACE_DEBUG_SYSTEM";
 179         case LTTNG_LOGLEVEL_DEBUG_PROGRAM:
 180                 return "TRACE_DEBUG_PROGRAM";
 181         case LTTNG_LOGLEVEL_DEBUG_PROCESS:
 182                 return "TRACE_DEBUG_PROCESS";
 183         case LTTNG_LOGLEVEL_DEBUG_MODULE:
 184                 return "TRACE_DEBUG_MODULE";
 185         case LTTNG_LOGLEVEL_DEBUG_UNIT:
 186                 return "TRACE_DEBUG_UNIT";
 187         case LTTNG_LOGLEVEL_DEBUG_FUNCTION:
 188                 return "TRACE_DEBUG_FUNCTION";
 189         case LTTNG_LOGLEVEL_DEBUG_LINE:
 190                 return "TRACE_DEBUG_LINE";
 191         case LTTNG_LOGLEVEL_DEBUG:
 192                 return "TRACE_DEBUG";
 193         default:
 194                 return "<<UNKNOWN>>";
 195         }
 196 }
 197
 198 /*
 199  * Pretty print single event.
 200  */
 201 static void print_events(struct lttng_event *event)
 202 {
 203         switch (event->type) {
 204         case LTTNG_EVENT_TRACEPOINT:
 205         {
 206                 if (event->loglevel != -1) {
 207                         MSG("%s%s (loglevel: %s (%d)) (type: tracepoint)%s%s",
 208                                 indent6,
 209                                 event->name,
 210                                 loglevel_string(event->loglevel),
 211                                 event->loglevel,
 212                                 enabled_string(event->enabled),
 213                                 filter_string(event->filter));
 214                 } else {
 215                         MSG("%s%s (type: tracepoint)%s%s",
 216                                 indent6,
 217                                 event->name,
 218                                 enabled_string(event->enabled),
 219                                 filter_string(event->filter));
 220                 }
 221                 break;
 222         }
 223         case LTTNG_EVENT_PROBE:
 224                 MSG("%s%s (type: probe)%s%s", indent6,
 225                                 event->name, enabled_string(event->enabled),
 226                                 filter_string(event->filter));
 227                 if (event->attr.probe.addr != 0) {
 228                         MSG("%saddr: 0x%" PRIx64, indent8, event->attr.probe.addr);
 229                 } else {
 230                         MSG("%soffset: 0x%" PRIx64, indent8, event->attr.probe.offset);
 231                         MSG("%ssymbol: %s", indent8, event->attr.probe.symbol_name);
 232                 }
 233                 break;
 234         case LTTNG_EVENT_FUNCTION:
 235         case LTTNG_EVENT_FUNCTION_ENTRY:
 236                 MSG("%s%s (type: function)%s%s", indent6,
 237                                 event->name, enabled_string(event->enabled),
 238                                 filter_string(event->filter));
 239                 MSG("%ssymbol: \"%s\"", indent8, event->attr.ftrace.symbol_name);
 240                 break;
 241         case LTTNG_EVENT_SYSCALL:
 242                 MSG("%ssyscalls (type: syscall)%s%s", indent6,
 243                                 enabled_string(event->enabled),
 244                                 filter_string(event->filter));
 245                 break;
 246         case LTTNG_EVENT_NOOP:
 247                 MSG("%s (type: noop)%s%s", indent6,
 248                                 enabled_string(event->enabled),
 249                                 filter_string(event->filter));
 250                 break;
 251         case LTTNG_EVENT_ALL:
 252                 /* We should never have "all" events in list. */
 253                 assert(0);
 254                 break;
 255         }
 256 }
 257
 258 static const char *field_type(struct lttng_event_field *field)
 259 {
 260         switch(field->type) {
 261         case LTTNG_EVENT_FIELD_INTEGER:
 262                 return "integer";
 263         case LTTNG_EVENT_FIELD_ENUM:
 264                 return "enum";
 265         case LTTNG_EVENT_FIELD_FLOAT:
 266                 return "float";
 267         case LTTNG_EVENT_FIELD_STRING:
 268                 return "string";
 269         case LTTNG_EVENT_FIELD_OTHER:
 270         default:        /* fall-through */
 271                 return "unknown";
 272         }
 273 }
 274
 275 /*
 276  * Pretty print single event fields.
 277  */
 278 static void print_event_field(struct lttng_event_field *field)
 279 {
 280         if (!field->field_name[0]) {
 281                 return;
 282         }
 283         MSG("%sfield: %s (%s)%s", indent8, field->field_name,
 284                 field_type(field), field->nowrite ? " [no write]" : "");
 285 }
 286
 287 /*
 288  * Ask session daemon for all user space tracepoints available.
 289  */
 290 static int list_ust_events(void)
 291 {
 292         int i, size;
 293         struct lttng_domain domain;
 294         struct lttng_handle *handle;
 295         struct lttng_event *event_list;
 296         pid_t cur_pid = 0;
 297
 298         memset(&domain, 0, sizeof(domain));
 299
 300         DBG("Getting UST tracing events");
 301
 302         domain.type = LTTNG_DOMAIN_UST;
 303
 304         handle = lttng_create_handle(NULL, &domain);
 305         if (handle == NULL) {
 306                 goto error;
 307         }
 308
 309         size = lttng_list_tracepoints(handle, &event_list);
 310         if (size < 0) {
 311                 ERR("Unable to list UST events");
 312                 lttng_destroy_handle(handle);
 313                 return size;
 314         }
 315
 316         MSG("UST events:\n-------------");
 317
 318         if (size == 0) {
 319                 MSG("None");
 320         }
 321
 322         for (i = 0; i < size; i++) {
 323                 if (cur_pid != event_list[i].pid) {
 324                         cur_pid = event_list[i].pid;
 325                         MSG("\nPID: %d - Name: %s", cur_pid, get_cmdline_by_pid(cur_pid));
 326                 }
 327                 print_events(&event_list[i]);
 328         }
 329
 330         MSG("");
 331
 332         free(event_list);
 333         lttng_destroy_handle(handle);
 334
 335         return CMD_SUCCESS;
 336
 337 error:
 338         lttng_destroy_handle(handle);
 339         return -1;
 340 }
 341
 342 /*
 343  * Ask session daemon for all user space tracepoint fields available.
 344  */
 345 static int list_ust_event_fields(void)
 346 {
 347         int i, size;
 348         struct lttng_domain domain;
 349         struct lttng_handle *handle;
 350         struct lttng_event_field *event_field_list;
 351         pid_t cur_pid = 0;
 352         struct lttng_event cur_event;
 353
 354         memset(&domain, 0, sizeof(domain));
 355         memset(&cur_event, 0, sizeof(cur_event));
 356
 357         DBG("Getting UST tracing event fields");
 358
 359         domain.type = LTTNG_DOMAIN_UST;
 360
 361         handle = lttng_create_handle(NULL, &domain);
 362         if (handle == NULL) {
 363                 goto error;
 364         }
 365
 366         size = lttng_list_tracepoint_fields(handle, &event_field_list);
 367         if (size < 0) {
 368                 ERR("Unable to list UST event fields");
 369                 lttng_destroy_handle(handle);
 370                 return size;
 371         }
 372
 373         MSG("UST events:\n-------------");
 374
 375         if (size == 0) {
 376                 MSG("None");
 377         }
 378
 379         for (i = 0; i < size; i++) {
 380                 if (cur_pid != event_field_list[i].event.pid) {
 381                         cur_pid = event_field_list[i].event.pid;
 382                         MSG("\nPID: %d - Name: %s", cur_pid, get_cmdline_by_pid(cur_pid));
 383                 }
 384                 if (strcmp(cur_event.name, event_field_list[i].event.name) != 0) {
 385                         print_events(&event_field_list[i].event);
 386                         memcpy(&cur_event, &event_field_list[i].event,
 387                                 sizeof(cur_event));
 388                 }
 389                 print_event_field(&event_field_list[i]);
 390         }
 391
 392         MSG("");
 393
 394         free(event_field_list);
 395         lttng_destroy_handle(handle);
 396
 397         return CMD_SUCCESS;
 398
 399 error:
 400         lttng_destroy_handle(handle);
 401         return -1;
 402 }
 403
 404 /*
 405  * Ask for all trace events in the kernel and pretty print them.
 406  */
 407 static int list_kernel_events(void)
 408 {
 409         int i, size;
 410         struct lttng_domain domain;
 411         struct lttng_handle *handle;
 412         struct lttng_event *event_list;
 413
 414         memset(&domain, 0, sizeof(domain));
 415
 416         DBG("Getting kernel tracing events");
 417
 418         domain.type = LTTNG_DOMAIN_KERNEL;
 419
 420         handle = lttng_create_handle(NULL, &domain);
 421         if (handle == NULL) {
 422                 goto error;
 423         }
 424
 425         size = lttng_list_tracepoints(handle, &event_list);
 426         if (size < 0) {
 427                 ERR("Unable to list kernel events");
 428                 lttng_destroy_handle(handle);
 429                 return size;
 430         }
 431
 432         MSG("Kernel events:\n-------------");
 433
 434         for (i = 0; i < size; i++) {
 435                 print_events(&event_list[i]);
 436         }
 437
 438         MSG("");
 439
 440         free(event_list);
 441
 442         lttng_destroy_handle(handle);
 443         return CMD_SUCCESS;
 444
 445 error:
 446         lttng_destroy_handle(handle);
 447         return -1;
 448 }
 449
 450 /*
 451  * List events of channel of session and domain.
 452  */
 453 static int list_events(const char *channel_name)
 454 {
 455         int ret, count, i;
 456         struct lttng_event *events = NULL;
 457
 458         count = lttng_list_events(handle, channel_name, &events);
 459         if (count < 0) {
 460                 ret = count;
 461                 goto error;
 462         }
 463
 464         MSG("\n%sEvents:", indent4);
 465         if (count == 0) {
 466                 MSG("%sNone\n", indent6);
 467                 goto end;
 468         }
 469
 470         for (i = 0; i < count; i++) {
 471                 print_events(&events[i]);
 472         }
 473
 474         MSG("");
 475
 476 end:
 477         if (events) {
 478                 free(events);
 479         }
 480         ret = CMD_SUCCESS;
 481
 482 error:
 483         return ret;
 484 }
 485
 486 /*
 487  * Pretty print channel
 488  */
 489 static void print_channel(struct lttng_channel *channel)
 490 {
 491         MSG("- %s:%s\n", channel->name, enabled_string(channel->enabled));
 492
 493         MSG("%sAttributes:", indent4);
 494         MSG("%soverwrite mode: %d", indent6, channel->attr.overwrite);
 495         MSG("%ssubbufers size: %" PRIu64, indent6, channel->attr.subbuf_size);
 496         MSG("%snumber of subbufers: %" PRIu64, indent6, channel->attr.num_subbuf);
 497         MSG("%sswitch timer interval: %u", indent6, channel->attr.switch_timer_interval);
 498         MSG("%sread timer interval: %u", indent6, channel->attr.read_timer_interval);
 499         switch (channel->attr.output) {
 500                 case LTTNG_EVENT_SPLICE:
 501                         MSG("%soutput: splice()", indent6);
 502                         break;
 503                 case LTTNG_EVENT_MMAP:
 504                         MSG("%soutput: mmap()", indent6);
 505                         break;
 506         }
 507 }
 508
 509 /*
 510  * List channel(s) of session and domain.
 511  *
 512  * If channel_name is NULL, all channels are listed.
 513  */
 514 static int list_channels(const char *channel_name)
 515 {
 516         int count, i, ret = CMD_SUCCESS;
 517         unsigned int chan_found = 0;
 518         struct lttng_channel *channels = NULL;
 519
 520         DBG("Listing channel(s) (%s)", channel_name ? : "<all>");
 521
 522         count = lttng_list_channels(handle, &channels);
 523         if (count < 0) {
 524                 switch (-count) {
 525                 case LTTNG_ERR_KERN_CHAN_NOT_FOUND:
 526                         ret = CMD_SUCCESS;
 527                         WARN("No kernel channel");
 528                         break;
 529                 default:
 530                         /* We had a real error */
 531                         ret = count;
 532                         ERR("%s", lttng_strerror(ret));
 533                 }
 534                 goto error_channels;
 535         }
 536
 537         if (channel_name == NULL) {
 538                 MSG("Channels:\n-------------");
 539         }
 540
 541         for (i = 0; i < count; i++) {
 542                 if (channel_name != NULL) {
 543                         if (strncmp(channels[i].name, channel_name, NAME_MAX) == 0) {
 544                                 chan_found = 1;
 545                         } else {
 546                                 continue;
 547                         }
 548                 }
 549                 print_channel(&channels[i]);
 550
 551                 /* Listing events per channel */
 552                 ret = list_events(channels[i].name);
 553                 if (ret < 0) {
 554                         MSG("%s", lttng_strerror(ret));
 555                 }
 556
 557                 if (chan_found) {
 558                         break;
 559                 }
 560         }
 561
 562         if (!chan_found && channel_name != NULL) {
 563                 ERR("Channel %s not found", channel_name);
 564                 goto error;
 565         }
 566
 567         ret = CMD_SUCCESS;
 568
 569 error:
 570         free(channels);
 571
 572 error_channels:
 573         return ret;
 574 }
 575
 576 /*
 577  * List available tracing session. List only basic information.
 578  *
 579  * If session_name is NULL, all sessions are listed.
 580  */
 581 static int list_sessions(const char *session_name)
 582 {
 583         int ret, count, i;
 584         unsigned int session_found = 0;
 585         struct lttng_session *sessions;
 586
 587         count = lttng_list_sessions(&sessions);
 588         DBG("Session count %d", count);
 589         if (count < 0) {
 590                 ret = count;
 591                 goto error;
 592         } else if (count == 0) {
 593                 MSG("Currently no available tracing session");
 594                 goto end;
 595         }
 596
 597         if (session_name == NULL) {
 598                 MSG("Available tracing sessions:");
 599         }
 600
 601         for (i = 0; i < count; i++) {
 602                 if (session_name != NULL) {
 603                         if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
 604                                 session_found = 1;
 605                                 MSG("Tracing session %s:%s", session_name, active_string(sessions[i].enabled));
 606                                 MSG("%sTrace path: %s\n", indent4, sessions[i].path);
 607                                 break;
 608                         }
 609                         continue;
 610                 }
 611
 612                 MSG("  %d) %s (%s)%s", i + 1, sessions[i].name, sessions[i].path,
 613                                 active_string(sessions[i].enabled));
 614
 615                 if (session_found) {
 616                         break;
 617                 }
 618         }
 619
 620         free(sessions);
 621
 622         if (!session_found && session_name != NULL) {
 623                 ERR("Session '%s' not found", session_name);
 624                 ret = CMD_ERROR;
 625                 goto error;
 626         }
 627
 628         if (session_name == NULL) {
 629                 MSG("\nUse lttng list <session_name> for more details");
 630         }
 631
 632 end:
 633         return CMD_SUCCESS;
 634
 635 error:
 636         return ret;
 637 }
 638
 639 /*
 640  * List available domain(s) for a session.
 641  */
 642 static int list_domains(const char *session_name)
 643 {
 644         int i, count, ret = CMD_SUCCESS;
 645         struct lttng_domain *domains = NULL;
 646
 647         MSG("Domains:\n-------------");
 648
 649         count = lttng_list_domains(session_name, &domains);
 650         if (count < 0) {
 651                 ret = count;
 652                 goto error;
 653         } else if (count == 0) {
 654                 MSG("  None");
 655                 goto end;
 656         }
 657
 658         for (i = 0; i < count; i++) {
 659                 switch (domains[i].type) {
 660                 case LTTNG_DOMAIN_KERNEL:
 661                         MSG("  - Kernel");
 662                         break;
 663                 case LTTNG_DOMAIN_UST:
 664                         MSG("  - UST global");
 665                         break;
 666                 default:
 667                         break;
 668                 }
 669         }
 670
 671 end:
 672         free(domains);
 673
 674 error:
 675         return ret;
 676 }
 677
 678 /*
 679  * The 'list <options>' first level command
 680  */
 681 int cmd_list(int argc, const char **argv)
 682 {
 683         int opt, ret = CMD_SUCCESS;
 684         const char *session_name;
 685         static poptContext pc;
 686         struct lttng_domain domain;
 687         struct lttng_domain *domains = NULL;
 688
 689         memset(&domain, 0, sizeof(domain));
 690
 691         if (argc < 1) {
 692                 usage(stderr);
 693                 ret = CMD_ERROR;
 694                 goto end;
 695         }
 696
 697         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 698         poptReadDefaultConfig(pc, 0);
 699
 700         while ((opt = poptGetNextOpt(pc)) != -1) {
 701                 switch (opt) {
 702                 case OPT_HELP:
 703                         usage(stdout);
 704                         goto end;
 705                 case OPT_USERSPACE:
 706                         opt_userspace = 1;
 707                         break;
 708                 case OPT_LIST_OPTIONS:
 709                         list_cmd_options(stdout, long_options);
 710                         goto end;
 711                 default:
 712                         usage(stderr);
 713                         ret = CMD_UNDEFINED;
 714                         goto end;
 715                 }
 716         }
 717
 718         /* Get session name (trailing argument) */
 719         session_name = poptGetArg(pc);
 720         DBG2("Session name: %s", session_name);
 721
 722         if (opt_kernel) {
 723                 domain.type = LTTNG_DOMAIN_KERNEL;
 724         } else if (opt_userspace) {
 725                 DBG2("Listing userspace global domain");
 726                 domain.type = LTTNG_DOMAIN_UST;
 727         }
 728
 729         if (opt_kernel || opt_userspace) {
 730                 handle = lttng_create_handle(session_name, &domain);
 731                 if (handle == NULL) {
 732                         ret = CMD_FATAL;
 733                         goto end;
 734                 }
 735         }
 736
 737         if (session_name == NULL) {
 738                 if (!opt_kernel && !opt_userspace) {
 739                         ret = list_sessions(NULL);
 740                         if (ret != 0) {
 741                                 goto end;
 742                         }
 743                 }
 744                 if (opt_kernel) {
 745                         ret = list_kernel_events();
 746                         if (ret < 0) {
 747                                 goto end;
 748                         }
 749                 }
 750                 if (opt_userspace) {
 751                         if (opt_fields) {
 752                                 ret = list_ust_event_fields();
 753                         } else {
 754                                 ret = list_ust_events();
 755                         }
 756                         if (ret < 0) {
 757                                 goto end;
 758                         }
 759                 }
 760         } else {
 761                 /* List session attributes */
 762                 ret = list_sessions(session_name);
 763                 if (ret != 0) {
 764                         goto end;
 765                 }
 766
 767                 /* Domain listing */
 768                 if (opt_domain) {
 769                         ret = list_domains(session_name);
 770                         goto end;
 771                 }
 772
 773                 if (opt_kernel) {
 774                         /* Channel listing */
 775                         ret = list_channels(opt_channel);
 776                         if (ret < 0) {
 777                                 goto end;
 778                         }
 779                 } else {
 780                         int i, nb_domain;
 781
 782                         /* We want all domain(s) */
 783                         nb_domain = lttng_list_domains(session_name, &domains);
 784                         if (nb_domain < 0) {
 785                                 ret = nb_domain;
 786                                 goto end;
 787                         }
 788
 789                         for (i = 0; i < nb_domain; i++) {
 790                                 switch (domains[i].type) {
 791                                 case LTTNG_DOMAIN_KERNEL:
 792                                         MSG("=== Domain: Kernel ===\n");
 793                                         break;
 794                                 case LTTNG_DOMAIN_UST:
 795                                         MSG("=== Domain: UST global ===\n");
 796                                         break;
 797                                 default:
 798                                         MSG("=== Domain: Unimplemented ===\n");
 799                                         break;
 800                                 }
 801
 802                                 /* Clean handle before creating a new one */
 803                                 if (handle) {
 804                                         lttng_destroy_handle(handle);
 805                                 }
 806
 807                                 handle = lttng_create_handle(session_name, &domains[i]);
 808                                 if (handle == NULL) {
 809                                         ret = CMD_FATAL;
 810                                         goto end;
 811                                 }
 812
 813                                 ret = list_channels(opt_channel);
 814                                 if (ret < 0) {
 815                                         goto end;
 816                                 }
 817                         }
 818                 }
 819         }
 820
 821 end:
 822         if (domains) {
 823                 free(domains);
 824         }
 825         if (handle) {
 826                 lttng_destroy_handle(handle);
 827         }
 828
 829         poptFreeContext(pc);
 830         return ret;
 831 }