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         char *cmdline = NULL;
 308
 309         memset(&domain, 0, sizeof(domain));
 310
 311         DBG("Getting UST tracing events");
 312
 313         domain.type = LTTNG_DOMAIN_UST;
 314
 315         handle = lttng_create_handle(NULL, &domain);
 316         if (handle == NULL) {
 317                 goto error;
 318         }
 319
 320         size = lttng_list_tracepoints(handle, &event_list);
 321         if (size < 0) {
 322                 ERR("Unable to list UST events: %s", lttng_strerror(size));
 323                 lttng_destroy_handle(handle);
 324                 return size;
 325         }
 326
 327         MSG("UST events:\n-------------");
 328
 329         if (size == 0) {
 330                 MSG("None");
 331         }
 332
 333         for (i = 0; i < size; i++) {
 334                 if (cur_pid != event_list[i].pid) {
 335                         cur_pid = event_list[i].pid;
 336                         cmdline = get_cmdline_by_pid(cur_pid);
 337                         MSG("\nPID: %d - Name: %s", cur_pid, cmdline);
 338                         free(cmdline);
 339                 }
 340                 print_events(&event_list[i]);
 341         }
 342
 343         MSG("");
 344
 345         free(event_list);
 346         lttng_destroy_handle(handle);
 347
 348         return CMD_SUCCESS;
 349
 350 error:
 351         lttng_destroy_handle(handle);
 352         return -1;
 353 }
 354
 355 /*
 356  * Ask session daemon for all user space tracepoint fields available.
 357  */
 358 static int list_ust_event_fields(void)
 359 {
 360         int i, size;
 361         struct lttng_domain domain;
 362         struct lttng_handle *handle;
 363         struct lttng_event_field *event_field_list;
 364         pid_t cur_pid = 0;
 365         char *cmdline = NULL;
 366
 367         struct lttng_event cur_event;
 368
 369         memset(&domain, 0, sizeof(domain));
 370         memset(&cur_event, 0, sizeof(cur_event));
 371
 372         DBG("Getting UST tracing event fields");
 373
 374         domain.type = LTTNG_DOMAIN_UST;
 375
 376         handle = lttng_create_handle(NULL, &domain);
 377         if (handle == NULL) {
 378                 goto error;
 379         }
 380
 381         size = lttng_list_tracepoint_fields(handle, &event_field_list);
 382         if (size < 0) {
 383                 ERR("Unable to list UST event fields: %s", lttng_strerror(size));
 384                 lttng_destroy_handle(handle);
 385                 return size;
 386         }
 387
 388         MSG("UST events:\n-------------");
 389
 390         if (size == 0) {
 391                 MSG("None");
 392         }
 393
 394         for (i = 0; i < size; i++) {
 395                 if (cur_pid != event_field_list[i].event.pid) {
 396                         cur_pid = event_field_list[i].event.pid;
 397                         cmdline = get_cmdline_by_pid(cur_pid);
 398                         MSG("\nPID: %d - Name: %s", cur_pid, cmdline);
 399                         free(cmdline);
 400                 }
 401                 if (strcmp(cur_event.name, event_field_list[i].event.name) != 0) {
 402                         print_events(&event_field_list[i].event);
 403                         memcpy(&cur_event, &event_field_list[i].event,
 404                                 sizeof(cur_event));
 405                 }
 406                 print_event_field(&event_field_list[i]);
 407         }
 408
 409         MSG("");
 410
 411         free(event_field_list);
 412         lttng_destroy_handle(handle);
 413
 414         return CMD_SUCCESS;
 415
 416 error:
 417         lttng_destroy_handle(handle);
 418         return -1;
 419 }
 420
 421 /*
 422  * Ask for all trace events in the kernel and pretty print them.
 423  */
 424 static int list_kernel_events(void)
 425 {
 426         int i, size;
 427         struct lttng_domain domain;
 428         struct lttng_handle *handle;
 429         struct lttng_event *event_list;
 430
 431         memset(&domain, 0, sizeof(domain));
 432
 433         DBG("Getting kernel tracing events");
 434
 435         domain.type = LTTNG_DOMAIN_KERNEL;
 436
 437         handle = lttng_create_handle(NULL, &domain);
 438         if (handle == NULL) {
 439                 goto error;
 440         }
 441
 442         size = lttng_list_tracepoints(handle, &event_list);
 443         if (size < 0) {
 444                 ERR("Unable to list kernel events: %s", lttng_strerror(size));
 445                 lttng_destroy_handle(handle);
 446                 return size;
 447         }
 448
 449         MSG("Kernel events:\n-------------");
 450
 451         for (i = 0; i < size; i++) {
 452                 print_events(&event_list[i]);
 453         }
 454
 455         MSG("");
 456
 457         free(event_list);
 458
 459         lttng_destroy_handle(handle);
 460         return CMD_SUCCESS;
 461
 462 error:
 463         lttng_destroy_handle(handle);
 464         return -1;
 465 }
 466
 467 /*
 468  * List events of channel of session and domain.
 469  */
 470 static int list_events(const char *channel_name)
 471 {
 472         int ret, count, i;
 473         struct lttng_event *events = NULL;
 474
 475         count = lttng_list_events(handle, channel_name, &events);
 476         if (count < 0) {
 477                 ret = count;
 478                 ERR("%s", lttng_strerror(ret));
 479                 goto error;
 480         }
 481
 482         MSG("\n%sEvents:", indent4);
 483         if (count == 0) {
 484                 MSG("%sNone\n", indent6);
 485                 goto end;
 486         }
 487
 488         for (i = 0; i < count; i++) {
 489                 print_events(&events[i]);
 490         }
 491
 492         MSG("");
 493
 494 end:
 495         free(events);
 496         ret = CMD_SUCCESS;
 497
 498 error:
 499         return ret;
 500 }
 501
 502 /*
 503  * Pretty print channel
 504  */
 505 static void print_channel(struct lttng_channel *channel)
 506 {
 507         MSG("- %s:%s\n", channel->name, enabled_string(channel->enabled));
 508
 509         MSG("%sAttributes:", indent4);
 510         MSG("%swrite mode: %s", indent6,
 511                         channel->attr.overwrite == 0 ? "discard" : "overwrite");
 512         MSG("%ssubbufers size: %" PRIu64 " bytes", indent6,
 513                         channel->attr.subbuf_size);
 514         MSG("%snumber of subbufers: %" PRIu64, indent6, channel->attr.num_subbuf);
 515         MSG("%sswitch timer interval: %u usec", indent6,
 516                         channel->attr.switch_timer_interval);
 517         MSG("%sread timer interval: %u usec", indent6,
 518                         channel->attr.read_timer_interval);
 519         switch (channel->attr.output) {
 520                 case LTTNG_EVENT_SPLICE:
 521                         MSG("%soutput: splice()", indent6);
 522                         break;
 523                 case LTTNG_EVENT_MMAP:
 524                         MSG("%soutput: mmap()", indent6);
 525                         break;
 526         }
 527 }
 528
 529 /*
 530  * List channel(s) of session and domain.
 531  *
 532  * If channel_name is NULL, all channels are listed.
 533  */
 534 static int list_channels(const char *channel_name)
 535 {
 536         int count, i, ret = CMD_SUCCESS;
 537         unsigned int chan_found = 0;
 538         struct lttng_channel *channels = NULL;
 539
 540         DBG("Listing channel(s) (%s)", channel_name ? : "<all>");
 541
 542         count = lttng_list_channels(handle, &channels);
 543         if (count < 0) {
 544                 switch (-count) {
 545                 case LTTNG_ERR_KERN_CHAN_NOT_FOUND:
 546                         ret = CMD_SUCCESS;
 547                         WARN("No kernel channel");
 548                         break;
 549                 default:
 550                         /* We had a real error */
 551                         ret = count;
 552                         ERR("%s", lttng_strerror(ret));
 553                         break;
 554                 }
 555                 goto error_channels;
 556         }
 557
 558         if (channel_name == NULL) {
 559                 MSG("Channels:\n-------------");
 560         }
 561
 562         for (i = 0; i < count; i++) {
 563                 if (channel_name != NULL) {
 564                         if (strncmp(channels[i].name, channel_name, NAME_MAX) == 0) {
 565                                 chan_found = 1;
 566                         } else {
 567                                 continue;
 568                         }
 569                 }
 570                 print_channel(&channels[i]);
 571
 572                 /* Listing events per channel */
 573                 ret = list_events(channels[i].name);
 574                 if (ret < 0) {
 575                         ERR("%s", lttng_strerror(ret));
 576                 }
 577
 578                 if (chan_found) {
 579                         break;
 580                 }
 581         }
 582
 583         if (!chan_found && channel_name != NULL) {
 584                 ERR("Channel %s not found", channel_name);
 585                 goto error;
 586         }
 587
 588         ret = CMD_SUCCESS;
 589
 590 error:
 591         free(channels);
 592
 593 error_channels:
 594         return ret;
 595 }
 596
 597 /*
 598  * List available tracing session. List only basic information.
 599  *
 600  * If session_name is NULL, all sessions are listed.
 601  */
 602 static int list_sessions(const char *session_name)
 603 {
 604         int ret, count, i;
 605         unsigned int session_found = 0;
 606         struct lttng_session *sessions;
 607
 608         count = lttng_list_sessions(&sessions);
 609         DBG("Session count %d", count);
 610         if (count < 0) {
 611                 ret = count;
 612                 ERR("%s", lttng_strerror(ret));
 613                 goto error;
 614         } else if (count == 0) {
 615                 MSG("Currently no available tracing session");
 616                 goto end;
 617         }
 618
 619         if (session_name == NULL) {
 620                 MSG("Available tracing sessions:");
 621         }
 622
 623         for (i = 0; i < count; i++) {
 624                 if (session_name != NULL) {
 625                         if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
 626                                 session_found = 1;
 627                                 MSG("Tracing session %s:%s", session_name, active_string(sessions[i].enabled));
 628                                 MSG("%sTrace path: %s\n", indent4, sessions[i].path);
 629                                 break;
 630                         }
 631                         continue;
 632                 }
 633
 634                 MSG("  %d) %s (%s)%s", i + 1, sessions[i].name, sessions[i].path,
 635                                 active_string(sessions[i].enabled));
 636
 637                 if (session_found) {
 638                         break;
 639                 }
 640         }
 641
 642         free(sessions);
 643
 644         if (!session_found && session_name != NULL) {
 645                 ERR("Session '%s' not found", session_name);
 646                 ret = CMD_ERROR;
 647                 goto error;
 648         }
 649
 650         if (session_name == NULL) {
 651                 MSG("\nUse lttng list <session_name> for more details");
 652         }
 653
 654 end:
 655         return CMD_SUCCESS;
 656
 657 error:
 658         return ret;
 659 }
 660
 661 /*
 662  * List available domain(s) for a session.
 663  */
 664 static int list_domains(const char *session_name)
 665 {
 666         int i, count, ret = CMD_SUCCESS;
 667         struct lttng_domain *domains = NULL;
 668
 669         MSG("Domains:\n-------------");
 670
 671         count = lttng_list_domains(session_name, &domains);
 672         if (count < 0) {
 673                 ret = count;
 674                 ERR("%s", lttng_strerror(ret));
 675                 goto error;
 676         } else if (count == 0) {
 677                 MSG("  None");
 678                 goto end;
 679         }
 680
 681         for (i = 0; i < count; i++) {
 682                 switch (domains[i].type) {
 683                 case LTTNG_DOMAIN_KERNEL:
 684                         MSG("  - Kernel");
 685                         break;
 686                 case LTTNG_DOMAIN_UST:
 687                         MSG("  - UST global");
 688                         break;
 689                 default:
 690                         break;
 691                 }
 692         }
 693
 694 end:
 695         free(domains);
 696
 697 error:
 698         return ret;
 699 }
 700
 701 /*
 702  * The 'list <options>' first level command
 703  */
 704 int cmd_list(int argc, const char **argv)
 705 {
 706         int opt, ret = CMD_SUCCESS;
 707         const char *session_name;
 708         static poptContext pc;
 709         struct lttng_domain domain;
 710         struct lttng_domain *domains = NULL;
 711
 712         memset(&domain, 0, sizeof(domain));
 713
 714         if (argc < 1) {
 715                 usage(stderr);
 716                 ret = CMD_ERROR;
 717                 goto end;
 718         }
 719
 720         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 721         poptReadDefaultConfig(pc, 0);
 722
 723         while ((opt = poptGetNextOpt(pc)) != -1) {
 724                 switch (opt) {
 725                 case OPT_HELP:
 726                         usage(stdout);
 727                         goto end;
 728                 case OPT_USERSPACE:
 729                         opt_userspace = 1;
 730                         break;
 731                 case OPT_LIST_OPTIONS:
 732                         list_cmd_options(stdout, long_options);
 733                         goto end;
 734                 default:
 735                         usage(stderr);
 736                         ret = CMD_UNDEFINED;
 737                         goto end;
 738                 }
 739         }
 740
 741         /* Get session name (trailing argument) */
 742         session_name = poptGetArg(pc);
 743         DBG2("Session name: %s", session_name);
 744
 745         if (opt_kernel) {
 746                 domain.type = LTTNG_DOMAIN_KERNEL;
 747         } else if (opt_userspace) {
 748                 DBG2("Listing userspace global domain");
 749                 domain.type = LTTNG_DOMAIN_UST;
 750         }
 751
 752         if (opt_kernel || opt_userspace) {
 753                 handle = lttng_create_handle(session_name, &domain);
 754                 if (handle == NULL) {
 755                         ret = CMD_FATAL;
 756                         goto end;
 757                 }
 758         }
 759
 760         if (session_name == NULL) {
 761                 if (!opt_kernel && !opt_userspace) {
 762                         ret = list_sessions(NULL);
 763                         if (ret != 0) {
 764                                 goto end;
 765                         }
 766                 }
 767                 if (opt_kernel) {
 768                         ret = list_kernel_events();
 769                         if (ret < 0) {
 770                                 ret = CMD_ERROR;
 771                                 goto end;
 772                         }
 773                 }
 774                 if (opt_userspace) {
 775                         if (opt_fields) {
 776                                 ret = list_ust_event_fields();
 777                         } else {
 778                                 ret = list_ust_events();
 779                         }
 780                         if (ret < 0) {
 781                                 ret = CMD_ERROR;
 782                                 goto end;
 783                         }
 784                 }
 785         } else {
 786                 /* List session attributes */
 787                 ret = list_sessions(session_name);
 788                 if (ret != 0) {
 789                         goto end;
 790                 }
 791
 792                 /* Domain listing */
 793                 if (opt_domain) {
 794                         ret = list_domains(session_name);
 795                         goto end;
 796                 }
 797
 798                 if (opt_kernel) {
 799                         /* Channel listing */
 800                         ret = list_channels(opt_channel);
 801                         if (ret < 0) {
 802                                 goto end;
 803                         }
 804                 } else {
 805                         int i, nb_domain;
 806
 807                         /* We want all domain(s) */
 808                         nb_domain = lttng_list_domains(session_name, &domains);
 809                         if (nb_domain < 0) {
 810                                 ret = nb_domain;
 811                                 ERR("%s", lttng_strerror(ret));
 812                                 goto end;
 813                         }
 814
 815                         for (i = 0; i < nb_domain; i++) {
 816                                 switch (domains[i].type) {
 817                                 case LTTNG_DOMAIN_KERNEL:
 818                                         MSG("=== Domain: Kernel ===\n");
 819                                         break;
 820                                 case LTTNG_DOMAIN_UST:
 821                                         MSG("=== Domain: UST global ===\n");
 822                                         MSG("Buffer type: %s\n",
 823                                                         domains[i].buf_type ==
 824                                                         LTTNG_BUFFER_PER_PID ? "per PID" : "per UID");
 825                                         break;
 826                                 default:
 827                                         MSG("=== Domain: Unimplemented ===\n");
 828                                         break;
 829                                 }
 830
 831                                 /* Clean handle before creating a new one */
 832                                 if (handle) {
 833                                         lttng_destroy_handle(handle);
 834                                 }
 835
 836                                 handle = lttng_create_handle(session_name, &domains[i]);
 837                                 if (handle == NULL) {
 838                                         ret = CMD_FATAL;
 839                                         goto end;
 840                                 }
 841
 842                                 ret = list_channels(opt_channel);
 843                                 if (ret < 0) {
 844                                         goto end;
 845                                 }
 846                         }
 847                 }
 848         }
 849
 850 end:
 851         free(domains);
 852         if (handle) {
 853                 lttng_destroy_handle(handle);
 854         }
 855
 856         poptFreeContext(pc);
 857         return ret;
 858 }