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: %s", lttng_strerror(size));
 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: %s", lttng_strerror(size));
 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: %s", lttng_strerror(size));
 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                 ERR("%s", lttng_strerror(ret));
 472                 goto error;
 473         }
 474
 475         MSG("\n%sEvents:", indent4);
 476         if (count == 0) {
 477                 MSG("%sNone\n", indent6);
 478                 goto end;
 479         }
 480
 481         for (i = 0; i < count; i++) {
 482                 print_events(&events[i]);
 483         }
 484
 485         MSG("");
 486
 487 end:
 488         if (events) {
 489                 free(events);
 490         }
 491         ret = CMD_SUCCESS;
 492
 493 error:
 494         return ret;
 495 }
 496
 497 /*
 498  * Pretty print channel
 499  */
 500 static void print_channel(struct lttng_channel *channel)
 501 {
 502         MSG("- %s:%s\n", channel->name, enabled_string(channel->enabled));
 503
 504         MSG("%sAttributes:", indent4);
 505         MSG("%soverwrite mode: %d", indent6, channel->attr.overwrite);
 506         MSG("%ssubbufers size: %" PRIu64, indent6, channel->attr.subbuf_size);
 507         MSG("%snumber of subbufers: %" PRIu64, indent6, channel->attr.num_subbuf);
 508         MSG("%sswitch timer interval: %u", indent6, channel->attr.switch_timer_interval);
 509         MSG("%sread timer interval: %u", indent6, channel->attr.read_timer_interval);
 510         switch (channel->attr.output) {
 511                 case LTTNG_EVENT_SPLICE:
 512                         MSG("%soutput: splice()", indent6);
 513                         break;
 514                 case LTTNG_EVENT_MMAP:
 515                         MSG("%soutput: mmap()", indent6);
 516                         break;
 517         }
 518 }
 519
 520 /*
 521  * List channel(s) of session and domain.
 522  *
 523  * If channel_name is NULL, all channels are listed.
 524  */
 525 static int list_channels(const char *channel_name)
 526 {
 527         int count, i, ret = CMD_SUCCESS;
 528         unsigned int chan_found = 0;
 529         struct lttng_channel *channels = NULL;
 530
 531         DBG("Listing channel(s) (%s)", channel_name ? : "<all>");
 532
 533         count = lttng_list_channels(handle, &channels);
 534         if (count < 0) {
 535                 switch (-count) {
 536                 case LTTNG_ERR_KERN_CHAN_NOT_FOUND:
 537                         ret = CMD_SUCCESS;
 538                         WARN("No kernel channel");
 539                         break;
 540                 default:
 541                         /* We had a real error */
 542                         ret = count;
 543                         ERR("%s", lttng_strerror(ret));
 544                         break;
 545                 }
 546                 goto error_channels;
 547         }
 548
 549         if (channel_name == NULL) {
 550                 MSG("Channels:\n-------------");
 551         }
 552
 553         for (i = 0; i < count; i++) {
 554                 if (channel_name != NULL) {
 555                         if (strncmp(channels[i].name, channel_name, NAME_MAX) == 0) {
 556                                 chan_found = 1;
 557                         } else {
 558                                 continue;
 559                         }
 560                 }
 561                 print_channel(&channels[i]);
 562
 563                 /* Listing events per channel */
 564                 ret = list_events(channels[i].name);
 565                 if (ret < 0) {
 566                         ERR("%s", lttng_strerror(ret));
 567                 }
 568
 569                 if (chan_found) {
 570                         break;
 571                 }
 572         }
 573
 574         if (!chan_found && channel_name != NULL) {
 575                 ERR("Channel %s not found", channel_name);
 576                 goto error;
 577         }
 578
 579         ret = CMD_SUCCESS;
 580
 581 error:
 582         free(channels);
 583
 584 error_channels:
 585         return ret;
 586 }
 587
 588 /*
 589  * List available tracing session. List only basic information.
 590  *
 591  * If session_name is NULL, all sessions are listed.
 592  */
 593 static int list_sessions(const char *session_name)
 594 {
 595         int ret, count, i;
 596         unsigned int session_found = 0;
 597         struct lttng_session *sessions;
 598
 599         count = lttng_list_sessions(&sessions);
 600         DBG("Session count %d", count);
 601         if (count < 0) {
 602                 ret = count;
 603                 ERR("%s", lttng_strerror(ret));
 604                 goto error;
 605         } else if (count == 0) {
 606                 MSG("Currently no available tracing session");
 607                 goto end;
 608         }
 609
 610         if (session_name == NULL) {
 611                 MSG("Available tracing sessions:");
 612         }
 613
 614         for (i = 0; i < count; i++) {
 615                 if (session_name != NULL) {
 616                         if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
 617                                 session_found = 1;
 618                                 MSG("Tracing session %s:%s", session_name, active_string(sessions[i].enabled));
 619                                 MSG("%sTrace path: %s\n", indent4, sessions[i].path);
 620                                 break;
 621                         }
 622                         continue;
 623                 }
 624
 625                 MSG("  %d) %s (%s)%s", i + 1, sessions[i].name, sessions[i].path,
 626                                 active_string(sessions[i].enabled));
 627
 628                 if (session_found) {
 629                         break;
 630                 }
 631         }
 632
 633         free(sessions);
 634
 635         if (!session_found && session_name != NULL) {
 636                 ERR("Session '%s' not found", session_name);
 637                 ret = CMD_ERROR;
 638                 goto error;
 639         }
 640
 641         if (session_name == NULL) {
 642                 MSG("\nUse lttng list <session_name> for more details");
 643         }
 644
 645 end:
 646         return CMD_SUCCESS;
 647
 648 error:
 649         return ret;
 650 }
 651
 652 /*
 653  * List available domain(s) for a session.
 654  */
 655 static int list_domains(const char *session_name)
 656 {
 657         int i, count, ret = CMD_SUCCESS;
 658         struct lttng_domain *domains = NULL;
 659
 660         MSG("Domains:\n-------------");
 661
 662         count = lttng_list_domains(session_name, &domains);
 663         if (count < 0) {
 664                 ret = count;
 665                 ERR("%s", lttng_strerror(ret));
 666                 goto error;
 667         } else if (count == 0) {
 668                 MSG("  None");
 669                 goto end;
 670         }
 671
 672         for (i = 0; i < count; i++) {
 673                 switch (domains[i].type) {
 674                 case LTTNG_DOMAIN_KERNEL:
 675                         MSG("  - Kernel");
 676                         break;
 677                 case LTTNG_DOMAIN_UST:
 678                         MSG("  - UST global");
 679                         break;
 680                 default:
 681                         break;
 682                 }
 683         }
 684
 685 end:
 686         free(domains);
 687
 688 error:
 689         return ret;
 690 }
 691
 692 /*
 693  * The 'list <options>' first level command
 694  */
 695 int cmd_list(int argc, const char **argv)
 696 {
 697         int opt, ret = CMD_SUCCESS;
 698         const char *session_name;
 699         static poptContext pc;
 700         struct lttng_domain domain;
 701         struct lttng_domain *domains = NULL;
 702
 703         memset(&domain, 0, sizeof(domain));
 704
 705         if (argc < 1) {
 706                 usage(stderr);
 707                 ret = CMD_ERROR;
 708                 goto end;
 709         }
 710
 711         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 712         poptReadDefaultConfig(pc, 0);
 713
 714         while ((opt = poptGetNextOpt(pc)) != -1) {
 715                 switch (opt) {
 716                 case OPT_HELP:
 717                         usage(stdout);
 718                         goto end;
 719                 case OPT_USERSPACE:
 720                         opt_userspace = 1;
 721                         break;
 722                 case OPT_LIST_OPTIONS:
 723                         list_cmd_options(stdout, long_options);
 724                         goto end;
 725                 default:
 726                         usage(stderr);
 727                         ret = CMD_UNDEFINED;
 728                         goto end;
 729                 }
 730         }
 731
 732         /* Get session name (trailing argument) */
 733         session_name = poptGetArg(pc);
 734         DBG2("Session name: %s", session_name);
 735
 736         if (opt_kernel) {
 737                 domain.type = LTTNG_DOMAIN_KERNEL;
 738         } else if (opt_userspace) {
 739                 DBG2("Listing userspace global domain");
 740                 domain.type = LTTNG_DOMAIN_UST;
 741         }
 742
 743         if (opt_kernel || opt_userspace) {
 744                 handle = lttng_create_handle(session_name, &domain);
 745                 if (handle == NULL) {
 746                         ret = CMD_FATAL;
 747                         goto end;
 748                 }
 749         }
 750
 751         if (session_name == NULL) {
 752                 if (!opt_kernel && !opt_userspace) {
 753                         ret = list_sessions(NULL);
 754                         if (ret != 0) {
 755                                 goto end;
 756                         }
 757                 }
 758                 if (opt_kernel) {
 759                         ret = list_kernel_events();
 760                         if (ret < 0) {
 761                                 ret = CMD_ERROR;
 762                                 goto end;
 763                         }
 764                 }
 765                 if (opt_userspace) {
 766                         if (opt_fields) {
 767                                 ret = list_ust_event_fields();
 768                         } else {
 769                                 ret = list_ust_events();
 770                         }
 771                         if (ret < 0) {
 772                                 ret = CMD_ERROR;
 773                                 goto end;
 774                         }
 775                 }
 776         } else {
 777                 /* List session attributes */
 778                 ret = list_sessions(session_name);
 779                 if (ret != 0) {
 780                         goto end;
 781                 }
 782
 783                 /* Domain listing */
 784                 if (opt_domain) {
 785                         ret = list_domains(session_name);
 786                         goto end;
 787                 }
 788
 789                 if (opt_kernel) {
 790                         /* Channel listing */
 791                         ret = list_channels(opt_channel);
 792                         if (ret < 0) {
 793                                 goto end;
 794                         }
 795                 } else {
 796                         int i, nb_domain;
 797
 798                         /* We want all domain(s) */
 799                         nb_domain = lttng_list_domains(session_name, &domains);
 800                         if (nb_domain < 0) {
 801                                 ret = nb_domain;
 802                                 ERR("%s", lttng_strerror(ret));
 803                                 goto end;
 804                         }
 805
 806                         for (i = 0; i < nb_domain; i++) {
 807                                 switch (domains[i].type) {
 808                                 case LTTNG_DOMAIN_KERNEL:
 809                                         MSG("=== Domain: Kernel ===\n");
 810                                         break;
 811                                 case LTTNG_DOMAIN_UST:
 812                                         MSG("=== Domain: UST global ===\n");
 813                                         break;
 814                                 default:
 815                                         MSG("=== Domain: Unimplemented ===\n");
 816                                         break;
 817                                 }
 818
 819                                 /* Clean handle before creating a new one */
 820                                 if (handle) {
 821                                         lttng_destroy_handle(handle);
 822                                 }
 823
 824                                 handle = lttng_create_handle(session_name, &domains[i]);
 825                                 if (handle == NULL) {
 826                                         ret = CMD_FATAL;
 827                                         goto end;
 828                                 }
 829
 830                                 ret = list_channels(opt_channel);
 831                                 if (ret < 0) {
 832                                         goto end;
 833                                 }
 834                         }
 835                 }
 836         }
 837
 838 end:
 839         if (domains) {
 840                 free(domains);
 841         }
 842         if (handle) {
 843                 lttng_destroy_handle(handle);
 844         }
 845
 846         poptFreeContext(pc);
 847         return ret;
 848 }