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_FUNCTION:
 224                 MSG("%s%s (type: function)%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_PROBE:
 235                 MSG("%s%s (type: probe)%s%s", indent6,
 236                                 event->name, enabled_string(event->enabled),
 237                                 filter_string(event->filter));
 238                 if (event->attr.probe.addr != 0) {
 239                         MSG("%saddr: 0x%" PRIx64, indent8, event->attr.probe.addr);
 240                 } else {
 241                         MSG("%soffset: 0x%" PRIx64, indent8, event->attr.probe.offset);
 242                         MSG("%ssymbol: %s", indent8, event->attr.probe.symbol_name);
 243                 }
 244                 break;
 245         case LTTNG_EVENT_FUNCTION_ENTRY:
 246                 MSG("%s%s (type: function)%s%s", indent6,
 247                                 event->name, enabled_string(event->enabled),
 248                                 filter_string(event->filter));
 249                 MSG("%ssymbol: \"%s\"", indent8, event->attr.ftrace.symbol_name);
 250                 break;
 251         case LTTNG_EVENT_SYSCALL:
 252                 MSG("%ssyscalls (type: syscall)%s%s", indent6,
 253                                 enabled_string(event->enabled),
 254                                 filter_string(event->filter));
 255                 break;
 256         case LTTNG_EVENT_NOOP:
 257                 MSG("%s (type: noop)%s%s", indent6,
 258                                 enabled_string(event->enabled),
 259                                 filter_string(event->filter));
 260                 break;
 261         case LTTNG_EVENT_ALL:
 262                 /* We should never have "all" events in list. */
 263                 assert(0);
 264                 break;
 265         }
 266 }
 267
 268 static const char *field_type(struct lttng_event_field *field)
 269 {
 270         switch(field->type) {
 271         case LTTNG_EVENT_FIELD_INTEGER:
 272                 return "integer";
 273         case LTTNG_EVENT_FIELD_ENUM:
 274                 return "enum";
 275         case LTTNG_EVENT_FIELD_FLOAT:
 276                 return "float";
 277         case LTTNG_EVENT_FIELD_STRING:
 278                 return "string";
 279         case LTTNG_EVENT_FIELD_OTHER:
 280         default:        /* fall-through */
 281                 return "unknown";
 282         }
 283 }
 284
 285 /*
 286  * Pretty print single event fields.
 287  */
 288 static void print_event_field(struct lttng_event_field *field)
 289 {
 290         if (!field->field_name[0]) {
 291                 return;
 292         }
 293         MSG("%sfield: %s (%s)%s", indent8, field->field_name,
 294                 field_type(field), field->nowrite ? " [no write]" : "");
 295 }
 296
 297 /*
 298  * Ask session daemon for all user space tracepoints available.
 299  */
 300 static int list_ust_events(void)
 301 {
 302         int i, size;
 303         struct lttng_domain domain;
 304         struct lttng_handle *handle;
 305         struct lttng_event *event_list;
 306         pid_t cur_pid = 0;
 307
 308         memset(&domain, 0, sizeof(domain));
 309
 310         DBG("Getting UST tracing events");
 311
 312         domain.type = LTTNG_DOMAIN_UST;
 313
 314         handle = lttng_create_handle(NULL, &domain);
 315         if (handle == NULL) {
 316                 goto error;
 317         }
 318
 319         size = lttng_list_tracepoints(handle, &event_list);
 320         if (size < 0) {
 321                 ERR("Unable to list UST events");
 322                 lttng_destroy_handle(handle);
 323                 return size;
 324         }
 325
 326         MSG("UST events:\n-------------");
 327
 328         if (size == 0) {
 329                 MSG("None");
 330         }
 331
 332         for (i = 0; i < size; i++) {
 333                 if (cur_pid != event_list[i].pid) {
 334                         cur_pid = event_list[i].pid;
 335                         MSG("\nPID: %d - Name: %s", cur_pid, get_cmdline_by_pid(cur_pid));
 336                 }
 337                 print_events(&event_list[i]);
 338         }
 339
 340         MSG("");
 341
 342         free(event_list);
 343         lttng_destroy_handle(handle);
 344
 345         return CMD_SUCCESS;
 346
 347 error:
 348         lttng_destroy_handle(handle);
 349         return -1;
 350 }
 351
 352 /*
 353  * Ask session daemon for all user space tracepoint fields available.
 354  */
 355 static int list_ust_event_fields(void)
 356 {
 357         int i, size;
 358         struct lttng_domain domain;
 359         struct lttng_handle *handle;
 360         struct lttng_event_field *event_field_list;
 361         pid_t cur_pid = 0;
 362         struct lttng_event cur_event;
 363
 364         memset(&domain, 0, sizeof(domain));
 365         memset(&cur_event, 0, sizeof(cur_event));
 366
 367         DBG("Getting UST tracing event fields");
 368
 369         domain.type = LTTNG_DOMAIN_UST;
 370
 371         handle = lttng_create_handle(NULL, &domain);
 372         if (handle == NULL) {
 373                 goto error;
 374         }
 375
 376         size = lttng_list_tracepoint_fields(handle, &event_field_list);
 377         if (size < 0) {
 378                 ERR("Unable to list UST event fields");
 379                 lttng_destroy_handle(handle);
 380                 return size;
 381         }
 382
 383         MSG("UST events:\n-------------");
 384
 385         if (size == 0) {
 386                 MSG("None");
 387         }
 388
 389         for (i = 0; i < size; i++) {
 390                 if (cur_pid != event_field_list[i].event.pid) {
 391                         cur_pid = event_field_list[i].event.pid;
 392                         MSG("\nPID: %d - Name: %s", cur_pid, get_cmdline_by_pid(cur_pid));
 393                 }
 394                 if (strcmp(cur_event.name, event_field_list[i].event.name) != 0) {
 395                         print_events(&event_field_list[i].event);
 396                         memcpy(&cur_event, &event_field_list[i].event,
 397                                 sizeof(cur_event));
 398                 }
 399                 print_event_field(&event_field_list[i]);
 400         }
 401
 402         MSG("");
 403
 404         free(event_field_list);
 405         lttng_destroy_handle(handle);
 406
 407         return CMD_SUCCESS;
 408
 409 error:
 410         lttng_destroy_handle(handle);
 411         return -1;
 412 }
 413
 414 /*
 415  * Ask for all trace events in the kernel and pretty print them.
 416  */
 417 static int list_kernel_events(void)
 418 {
 419         int i, size;
 420         struct lttng_domain domain;
 421         struct lttng_handle *handle;
 422         struct lttng_event *event_list;
 423
 424         memset(&domain, 0, sizeof(domain));
 425
 426         DBG("Getting kernel tracing events");
 427
 428         domain.type = LTTNG_DOMAIN_KERNEL;
 429
 430         handle = lttng_create_handle(NULL, &domain);
 431         if (handle == NULL) {
 432                 goto error;
 433         }
 434
 435         size = lttng_list_tracepoints(handle, &event_list);
 436         if (size < 0) {
 437                 ERR("Unable to list kernel events");
 438                 lttng_destroy_handle(handle);
 439                 return size;
 440         }
 441
 442         MSG("Kernel events:\n-------------");
 443
 444         for (i = 0; i < size; i++) {
 445                 print_events(&event_list[i]);
 446         }
 447
 448         MSG("");
 449
 450         free(event_list);
 451
 452         lttng_destroy_handle(handle);
 453         return CMD_SUCCESS;
 454
 455 error:
 456         lttng_destroy_handle(handle);
 457         return -1;
 458 }
 459
 460 /*
 461  * List events of channel of session and domain.
 462  */
 463 static int list_events(const char *channel_name)
 464 {
 465         int ret, count, i;
 466         struct lttng_event *events = NULL;
 467
 468         count = lttng_list_events(handle, channel_name, &events);
 469         if (count < 0) {
 470                 ret = count;
 471                 goto error;
 472         }
 473
 474         MSG("\n%sEvents:", indent4);
 475         if (count == 0) {
 476                 MSG("%sNone\n", indent6);
 477                 goto end;
 478         }
 479
 480         for (i = 0; i < count; i++) {
 481                 print_events(&events[i]);
 482         }
 483
 484         MSG("");
 485
 486 end:
 487         if (events) {
 488                 free(events);
 489         }
 490         ret = CMD_SUCCESS;
 491
 492 error:
 493         return ret;
 494 }
 495
 496 /*
 497  * Pretty print channel
 498  */
 499 static void print_channel(struct lttng_channel *channel)
 500 {
 501         MSG("- %s:%s\n", channel->name, enabled_string(channel->enabled));
 502
 503         MSG("%sAttributes:", indent4);
 504         MSG("%soverwrite mode: %d", indent6, channel->attr.overwrite);
 505         MSG("%ssubbufers size: %" PRIu64, indent6, channel->attr.subbuf_size);
 506         MSG("%snumber of subbufers: %" PRIu64, indent6, channel->attr.num_subbuf);
 507         MSG("%sswitch timer interval: %u", indent6, channel->attr.switch_timer_interval);
 508         MSG("%sread timer interval: %u", indent6, channel->attr.read_timer_interval);
 509         switch (channel->attr.output) {
 510                 case LTTNG_EVENT_SPLICE:
 511                         MSG("%soutput: splice()", indent6);
 512                         break;
 513                 case LTTNG_EVENT_MMAP:
 514                         MSG("%soutput: mmap()", indent6);
 515                         break;
 516         }
 517 }
 518
 519 /*
 520  * List channel(s) of session and domain.
 521  *
 522  * If channel_name is NULL, all channels are listed.
 523  */
 524 static int list_channels(const char *channel_name)
 525 {
 526         int count, i, ret = CMD_SUCCESS;
 527         unsigned int chan_found = 0;
 528         struct lttng_channel *channels = NULL;
 529
 530         DBG("Listing channel(s) (%s)", channel_name ? : "<all>");
 531
 532         count = lttng_list_channels(handle, &channels);
 533         if (count < 0) {
 534                 switch (-count) {
 535                 case LTTNG_ERR_KERN_CHAN_NOT_FOUND:
 536                         ret = CMD_SUCCESS;
 537                         WARN("No kernel channel");
 538                         break;
 539                 default:
 540                         /* We had a real error */
 541                         ret = count;
 542                         ERR("%s", lttng_strerror(ret));
 543                 }
 544                 goto error_channels;
 545         }
 546
 547         if (channel_name == NULL) {
 548                 MSG("Channels:\n-------------");
 549         }
 550
 551         for (i = 0; i < count; i++) {
 552                 if (channel_name != NULL) {
 553                         if (strncmp(channels[i].name, channel_name, NAME_MAX) == 0) {
 554                                 chan_found = 1;
 555                         } else {
 556                                 continue;
 557                         }
 558                 }
 559                 print_channel(&channels[i]);
 560
 561                 /* Listing events per channel */
 562                 ret = list_events(channels[i].name);
 563                 if (ret < 0) {
 564                         MSG("%s", lttng_strerror(ret));
 565                 }
 566
 567                 if (chan_found) {
 568                         break;
 569                 }
 570         }
 571
 572         if (!chan_found && channel_name != NULL) {
 573                 ERR("Channel %s not found", channel_name);
 574                 goto error;
 575         }
 576
 577         ret = CMD_SUCCESS;
 578
 579 error:
 580         free(channels);
 581
 582 error_channels:
 583         return ret;
 584 }
 585
 586 /*
 587  * List available tracing session. List only basic information.
 588  *
 589  * If session_name is NULL, all sessions are listed.
 590  */
 591 static int list_sessions(const char *session_name)
 592 {
 593         int ret, count, i;
 594         unsigned int session_found = 0;
 595         struct lttng_session *sessions;
 596
 597         count = lttng_list_sessions(&sessions);
 598         DBG("Session count %d", count);
 599         if (count < 0) {
 600                 ret = count;
 601                 ERR("%s", lttng_strerror(ret));
 602                 goto error;
 603         } else if (count == 0) {
 604                 MSG("Currently no available tracing session");
 605                 goto end;
 606         }
 607
 608         if (session_name == NULL) {
 609                 MSG("Available tracing sessions:");
 610         }
 611
 612         for (i = 0; i < count; i++) {
 613                 if (session_name != NULL) {
 614                         if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
 615                                 session_found = 1;
 616                                 MSG("Tracing session %s:%s", session_name, active_string(sessions[i].enabled));
 617                                 MSG("%sTrace path: %s\n", indent4, sessions[i].path);
 618                                 break;
 619                         }
 620                         continue;
 621                 }
 622
 623                 MSG("  %d) %s (%s)%s", i + 1, sessions[i].name, sessions[i].path,
 624                                 active_string(sessions[i].enabled));
 625
 626                 if (session_found) {
 627                         break;
 628                 }
 629         }
 630
 631         free(sessions);
 632
 633         if (!session_found && session_name != NULL) {
 634                 ERR("Session '%s' not found", session_name);
 635                 ret = CMD_ERROR;
 636                 goto error;
 637         }
 638
 639         if (session_name == NULL) {
 640                 MSG("\nUse lttng list <session_name> for more details");
 641         }
 642
 643 end:
 644         return CMD_SUCCESS;
 645
 646 error:
 647         return ret;
 648 }
 649
 650 /*
 651  * List available domain(s) for a session.
 652  */
 653 static int list_domains(const char *session_name)
 654 {
 655         int i, count, ret = CMD_SUCCESS;
 656         struct lttng_domain *domains = NULL;
 657
 658         MSG("Domains:\n-------------");
 659
 660         count = lttng_list_domains(session_name, &domains);
 661         if (count < 0) {
 662                 ret = count;
 663                 goto error;
 664         } else if (count == 0) {
 665                 MSG("  None");
 666                 goto end;
 667         }
 668
 669         for (i = 0; i < count; i++) {
 670                 switch (domains[i].type) {
 671                 case LTTNG_DOMAIN_KERNEL:
 672                         MSG("  - Kernel");
 673                         break;
 674                 case LTTNG_DOMAIN_UST:
 675                         MSG("  - UST global");
 676                         break;
 677                 default:
 678                         break;
 679                 }
 680         }
 681
 682 end:
 683         free(domains);
 684
 685 error:
 686         return ret;
 687 }
 688
 689 /*
 690  * The 'list <options>' first level command
 691  */
 692 int cmd_list(int argc, const char **argv)
 693 {
 694         int opt, ret = CMD_SUCCESS;
 695         const char *session_name;
 696         static poptContext pc;
 697         struct lttng_domain domain;
 698         struct lttng_domain *domains = NULL;
 699
 700         memset(&domain, 0, sizeof(domain));
 701
 702         if (argc < 1) {
 703                 usage(stderr);
 704                 ret = CMD_ERROR;
 705                 goto end;
 706         }
 707
 708         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 709         poptReadDefaultConfig(pc, 0);
 710
 711         while ((opt = poptGetNextOpt(pc)) != -1) {
 712                 switch (opt) {
 713                 case OPT_HELP:
 714                         usage(stdout);
 715                         goto end;
 716                 case OPT_USERSPACE:
 717                         opt_userspace = 1;
 718                         break;
 719                 case OPT_LIST_OPTIONS:
 720                         list_cmd_options(stdout, long_options);
 721                         goto end;
 722                 default:
 723                         usage(stderr);
 724                         ret = CMD_UNDEFINED;
 725                         goto end;
 726                 }
 727         }
 728
 729         /* Get session name (trailing argument) */
 730         session_name = poptGetArg(pc);
 731         DBG2("Session name: %s", session_name);
 732
 733         if (opt_kernel) {
 734                 domain.type = LTTNG_DOMAIN_KERNEL;
 735         } else if (opt_userspace) {
 736                 DBG2("Listing userspace global domain");
 737                 domain.type = LTTNG_DOMAIN_UST;
 738         }
 739
 740         if (opt_kernel || opt_userspace) {
 741                 handle = lttng_create_handle(session_name, &domain);
 742                 if (handle == NULL) {
 743                         ret = CMD_FATAL;
 744                         goto end;
 745                 }
 746         }
 747
 748         if (session_name == NULL) {
 749                 if (!opt_kernel && !opt_userspace) {
 750                         ret = list_sessions(NULL);
 751                         if (ret != 0) {
 752                                 goto end;
 753                         }
 754                 }
 755                 if (opt_kernel) {
 756                         ret = list_kernel_events();
 757                         if (ret < 0) {
 758                                 ret = CMD_ERROR;
 759                                 goto end;
 760                         }
 761                 }
 762                 if (opt_userspace) {
 763                         if (opt_fields) {
 764                                 ret = list_ust_event_fields();
 765                         } else {
 766                                 ret = list_ust_events();
 767                         }
 768                         if (ret < 0) {
 769                                 ret = CMD_ERROR;
 770                                 goto end;
 771                         }
 772                 }
 773         } else {
 774                 /* List session attributes */
 775                 ret = list_sessions(session_name);
 776                 if (ret != 0) {
 777                         goto end;
 778                 }
 779
 780                 /* Domain listing */
 781                 if (opt_domain) {
 782                         ret = list_domains(session_name);
 783                         goto end;
 784                 }
 785
 786                 if (opt_kernel) {
 787                         /* Channel listing */
 788                         ret = list_channels(opt_channel);
 789                         if (ret < 0) {
 790                                 goto end;
 791                         }
 792                 } else {
 793                         int i, nb_domain;
 794
 795                         /* We want all domain(s) */
 796                         nb_domain = lttng_list_domains(session_name, &domains);
 797                         if (nb_domain < 0) {
 798                                 ret = nb_domain;
 799                                 goto end;
 800                         }
 801
 802                         for (i = 0; i < nb_domain; i++) {
 803                                 switch (domains[i].type) {
 804                                 case LTTNG_DOMAIN_KERNEL:
 805                                         MSG("=== Domain: Kernel ===\n");
 806                                         break;
 807                                 case LTTNG_DOMAIN_UST:
 808                                         MSG("=== Domain: UST global ===\n");
 809                                         break;
 810                                 default:
 811                                         MSG("=== Domain: Unimplemented ===\n");
 812                                         break;
 813                                 }
 814
 815                                 /* Clean handle before creating a new one */
 816                                 if (handle) {
 817                                         lttng_destroy_handle(handle);
 818                                 }
 819
 820                                 handle = lttng_create_handle(session_name, &domains[i]);
 821                                 if (handle == NULL) {
 822                                         ret = CMD_FATAL;
 823                                         goto end;
 824                                 }
 825
 826                                 ret = list_channels(opt_channel);
 827                                 if (ret < 0) {
 828                                         goto end;
 829                                 }
 830                         }
 831                 }
 832         }
 833
 834 end:
 835         if (domains) {
 836                 free(domains);
 837         }
 838         if (handle) {
 839                 lttng_destroy_handle(handle);
 840         }
 841
 842         poptFreeContext(pc);
 843         return ret;
 844 }