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 [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[20];  /* 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         if (!cmdline) {
 118                 perror("malloc cmdline");
 119                 goto end;
 120         }
 121         ret = fread(cmdline, 1, PATH_MAX, fp);
 122         if (ret < 0) {
 123                 perror("fread proc list");
 124         }
 125         fclose(fp);
 126
 127 end:
 128         return cmdline;
 129 }
 130
 131 static
 132 const char *active_string(int value)
 133 {
 134         switch (value) {
 135         case 0: return "inactive";
 136         case 1: return "active";
 137         case -1: return "";
 138         default: return NULL;
 139         }
 140 }
 141
 142 static const char *snapshot_string(int value)
 143 {
 144         switch (value) {
 145         case 1:
 146                 return " snapshot";
 147         default:
 148                 return "";
 149         }
 150 }
 151
 152 static
 153 const char *enabled_string(int value)
 154 {
 155         switch (value) {
 156         case 0: return " [disabled]";
 157         case 1: return " [enabled]";
 158         case -1: return "";
 159         default: return NULL;
 160         }
 161 }
 162
 163 static
 164 const char *filter_string(int value)
 165 {
 166         switch (value) {
 167         case 1: return " [with filter]";
 168         default: return "";
 169         }
 170 }
 171
 172 static const char *loglevel_string(int value)
 173 {
 174         switch (value) {
 175         case -1:
 176                 return "";
 177         case LTTNG_LOGLEVEL_EMERG:
 178                 return "TRACE_EMERG";
 179         case LTTNG_LOGLEVEL_ALERT:
 180                 return "TRACE_ALERT";
 181         case LTTNG_LOGLEVEL_CRIT:
 182                 return "TRACE_CRIT";
 183         case LTTNG_LOGLEVEL_ERR:
 184                 return "TRACE_ERR";
 185         case LTTNG_LOGLEVEL_WARNING:
 186                 return "TRACE_WARNING";
 187         case LTTNG_LOGLEVEL_NOTICE:
 188                 return "TRACE_NOTICE";
 189         case LTTNG_LOGLEVEL_INFO:
 190                 return "TRACE_INFO";
 191         case LTTNG_LOGLEVEL_DEBUG_SYSTEM:
 192                 return "TRACE_DEBUG_SYSTEM";
 193         case LTTNG_LOGLEVEL_DEBUG_PROGRAM:
 194                 return "TRACE_DEBUG_PROGRAM";
 195         case LTTNG_LOGLEVEL_DEBUG_PROCESS:
 196                 return "TRACE_DEBUG_PROCESS";
 197         case LTTNG_LOGLEVEL_DEBUG_MODULE:
 198                 return "TRACE_DEBUG_MODULE";
 199         case LTTNG_LOGLEVEL_DEBUG_UNIT:
 200                 return "TRACE_DEBUG_UNIT";
 201         case LTTNG_LOGLEVEL_DEBUG_FUNCTION:
 202                 return "TRACE_DEBUG_FUNCTION";
 203         case LTTNG_LOGLEVEL_DEBUG_LINE:
 204                 return "TRACE_DEBUG_LINE";
 205         case LTTNG_LOGLEVEL_DEBUG:
 206                 return "TRACE_DEBUG";
 207         default:
 208                 return "<<UNKNOWN>>";
 209         }
 210 }
 211
 212 /*
 213  * Pretty print single event.
 214  */
 215 static void print_events(struct lttng_event *event)
 216 {
 217         switch (event->type) {
 218         case LTTNG_EVENT_TRACEPOINT:
 219         {
 220                 if (event->loglevel != -1) {
 221                         MSG("%s%s (loglevel: %s (%d)) (type: tracepoint)%s%s",
 222                                 indent6,
 223                                 event->name,
 224                                 loglevel_string(event->loglevel),
 225                                 event->loglevel,
 226                                 enabled_string(event->enabled),
 227                                 filter_string(event->filter));
 228                 } else {
 229                         MSG("%s%s (type: tracepoint)%s%s",
 230                                 indent6,
 231                                 event->name,
 232                                 enabled_string(event->enabled),
 233                                 filter_string(event->filter));
 234                 }
 235                 break;
 236         }
 237         case LTTNG_EVENT_FUNCTION:
 238                 MSG("%s%s (type: function)%s%s", indent6,
 239                                 event->name, enabled_string(event->enabled),
 240                                 filter_string(event->filter));
 241                 if (event->attr.probe.addr != 0) {
 242                         MSG("%saddr: 0x%" PRIx64, indent8, event->attr.probe.addr);
 243                 } else {
 244                         MSG("%soffset: 0x%" PRIx64, indent8, event->attr.probe.offset);
 245                         MSG("%ssymbol: %s", indent8, event->attr.probe.symbol_name);
 246                 }
 247                 break;
 248         case LTTNG_EVENT_PROBE:
 249                 MSG("%s%s (type: probe)%s%s", indent6,
 250                                 event->name, enabled_string(event->enabled),
 251                                 filter_string(event->filter));
 252                 if (event->attr.probe.addr != 0) {
 253                         MSG("%saddr: 0x%" PRIx64, indent8, event->attr.probe.addr);
 254                 } else {
 255                         MSG("%soffset: 0x%" PRIx64, indent8, event->attr.probe.offset);
 256                         MSG("%ssymbol: %s", indent8, event->attr.probe.symbol_name);
 257                 }
 258                 break;
 259         case LTTNG_EVENT_FUNCTION_ENTRY:
 260                 MSG("%s%s (type: function)%s%s", indent6,
 261                                 event->name, enabled_string(event->enabled),
 262                                 filter_string(event->filter));
 263                 MSG("%ssymbol: \"%s\"", indent8, event->attr.ftrace.symbol_name);
 264                 break;
 265         case LTTNG_EVENT_SYSCALL:
 266                 MSG("%ssyscalls (type: syscall)%s%s", indent6,
 267                                 enabled_string(event->enabled),
 268                                 filter_string(event->filter));
 269                 break;
 270         case LTTNG_EVENT_NOOP:
 271                 MSG("%s (type: noop)%s%s", indent6,
 272                                 enabled_string(event->enabled),
 273                                 filter_string(event->filter));
 274                 break;
 275         case LTTNG_EVENT_ALL:
 276                 /* We should never have "all" events in list. */
 277                 assert(0);
 278                 break;
 279         }
 280 }
 281
 282 static const char *field_type(struct lttng_event_field *field)
 283 {
 284         switch(field->type) {
 285         case LTTNG_EVENT_FIELD_INTEGER:
 286                 return "integer";
 287         case LTTNG_EVENT_FIELD_ENUM:
 288                 return "enum";
 289         case LTTNG_EVENT_FIELD_FLOAT:
 290                 return "float";
 291         case LTTNG_EVENT_FIELD_STRING:
 292                 return "string";
 293         case LTTNG_EVENT_FIELD_OTHER:
 294         default:        /* fall-through */
 295                 return "unknown";
 296         }
 297 }
 298
 299 /*
 300  * Pretty print single event fields.
 301  */
 302 static void print_event_field(struct lttng_event_field *field)
 303 {
 304         if (!field->field_name[0]) {
 305                 return;
 306         }
 307         MSG("%sfield: %s (%s)%s", indent8, field->field_name,
 308                 field_type(field), field->nowrite ? " [no write]" : "");
 309 }
 310
 311 /*
 312  * Ask session daemon for all user space tracepoints available.
 313  */
 314 static int list_ust_events(void)
 315 {
 316         int i, size;
 317         struct lttng_domain domain;
 318         struct lttng_handle *handle;
 319         struct lttng_event *event_list;
 320         pid_t cur_pid = 0;
 321         char *cmdline = NULL;
 322
 323         memset(&domain, 0, sizeof(domain));
 324
 325         DBG("Getting UST tracing events");
 326
 327         domain.type = LTTNG_DOMAIN_UST;
 328
 329         handle = lttng_create_handle(NULL, &domain);
 330         if (handle == NULL) {
 331                 goto error;
 332         }
 333
 334         size = lttng_list_tracepoints(handle, &event_list);
 335         if (size < 0) {
 336                 ERR("Unable to list UST events: %s", lttng_strerror(size));
 337                 lttng_destroy_handle(handle);
 338                 return size;
 339         }
 340
 341         MSG("UST events:\n-------------");
 342
 343         if (size == 0) {
 344                 MSG("None");
 345         }
 346
 347         for (i = 0; i < size; i++) {
 348                 if (cur_pid != event_list[i].pid) {
 349                         cur_pid = event_list[i].pid;
 350                         cmdline = get_cmdline_by_pid(cur_pid);
 351                         MSG("\nPID: %d - Name: %s", cur_pid, cmdline);
 352                         free(cmdline);
 353                 }
 354                 print_events(&event_list[i]);
 355         }
 356
 357         MSG("");
 358
 359         free(event_list);
 360         lttng_destroy_handle(handle);
 361
 362         return CMD_SUCCESS;
 363
 364 error:
 365         lttng_destroy_handle(handle);
 366         return -1;
 367 }
 368
 369 /*
 370  * Ask session daemon for all user space tracepoint fields available.
 371  */
 372 static int list_ust_event_fields(void)
 373 {
 374         int i, size;
 375         struct lttng_domain domain;
 376         struct lttng_handle *handle;
 377         struct lttng_event_field *event_field_list;
 378         pid_t cur_pid = 0;
 379         char *cmdline = NULL;
 380
 381         struct lttng_event cur_event;
 382
 383         memset(&domain, 0, sizeof(domain));
 384         memset(&cur_event, 0, sizeof(cur_event));
 385
 386         DBG("Getting UST tracing event fields");
 387
 388         domain.type = LTTNG_DOMAIN_UST;
 389
 390         handle = lttng_create_handle(NULL, &domain);
 391         if (handle == NULL) {
 392                 goto error;
 393         }
 394
 395         size = lttng_list_tracepoint_fields(handle, &event_field_list);
 396         if (size < 0) {
 397                 ERR("Unable to list UST event fields: %s", lttng_strerror(size));
 398                 lttng_destroy_handle(handle);
 399                 return size;
 400         }
 401
 402         MSG("UST events:\n-------------");
 403
 404         if (size == 0) {
 405                 MSG("None");
 406         }
 407
 408         for (i = 0; i < size; i++) {
 409                 if (cur_pid != event_field_list[i].event.pid) {
 410                         cur_pid = event_field_list[i].event.pid;
 411                         cmdline = get_cmdline_by_pid(cur_pid);
 412                         MSG("\nPID: %d - Name: %s", cur_pid, cmdline);
 413                         free(cmdline);
 414                         /* Wipe current event since we are about to print a new PID. */
 415                         memset(&cur_event, 0, sizeof(cur_event));
 416                 }
 417                 if (strcmp(cur_event.name, event_field_list[i].event.name) != 0) {
 418                         print_events(&event_field_list[i].event);
 419                         memcpy(&cur_event, &event_field_list[i].event,
 420                                 sizeof(cur_event));
 421                 }
 422                 print_event_field(&event_field_list[i]);
 423         }
 424
 425         MSG("");
 426
 427         free(event_field_list);
 428         lttng_destroy_handle(handle);
 429
 430         return CMD_SUCCESS;
 431
 432 error:
 433         lttng_destroy_handle(handle);
 434         return -1;
 435 }
 436
 437 /*
 438  * Ask for all trace events in the kernel and pretty print them.
 439  */
 440 static int list_kernel_events(void)
 441 {
 442         int i, size;
 443         struct lttng_domain domain;
 444         struct lttng_handle *handle;
 445         struct lttng_event *event_list;
 446
 447         memset(&domain, 0, sizeof(domain));
 448
 449         DBG("Getting kernel tracing events");
 450
 451         domain.type = LTTNG_DOMAIN_KERNEL;
 452
 453         handle = lttng_create_handle(NULL, &domain);
 454         if (handle == NULL) {
 455                 goto error;
 456         }
 457
 458         size = lttng_list_tracepoints(handle, &event_list);
 459         if (size < 0) {
 460                 ERR("Unable to list kernel events: %s", lttng_strerror(size));
 461                 lttng_destroy_handle(handle);
 462                 return size;
 463         }
 464
 465         MSG("Kernel events:\n-------------");
 466
 467         for (i = 0; i < size; i++) {
 468                 print_events(&event_list[i]);
 469         }
 470
 471         MSG("");
 472
 473         free(event_list);
 474
 475         lttng_destroy_handle(handle);
 476         return CMD_SUCCESS;
 477
 478 error:
 479         lttng_destroy_handle(handle);
 480         return -1;
 481 }
 482
 483 /*
 484  * List events of channel of session and domain.
 485  */
 486 static int list_events(const char *channel_name)
 487 {
 488         int ret, count, i;
 489         struct lttng_event *events = NULL;
 490
 491         count = lttng_list_events(handle, channel_name, &events);
 492         if (count < 0) {
 493                 ret = count;
 494                 ERR("%s", lttng_strerror(ret));
 495                 goto error;
 496         }
 497
 498         MSG("\n%sEvents:", indent4);
 499         if (count == 0) {
 500                 MSG("%sNone\n", indent6);
 501                 goto end;
 502         }
 503
 504         for (i = 0; i < count; i++) {
 505                 print_events(&events[i]);
 506         }
 507
 508         MSG("");
 509
 510 end:
 511         free(events);
 512         ret = CMD_SUCCESS;
 513
 514 error:
 515         return ret;
 516 }
 517
 518 /*
 519  * Pretty print channel
 520  */
 521 static void print_channel(struct lttng_channel *channel)
 522 {
 523         MSG("- %s:%s\n", channel->name, enabled_string(channel->enabled));
 524
 525         MSG("%sAttributes:", indent4);
 526         MSG("%soverwrite mode: %d", indent6, channel->attr.overwrite);
 527         MSG("%ssubbufers size: %" PRIu64, indent6, channel->attr.subbuf_size);
 528         MSG("%snumber of subbufers: %" PRIu64, indent6, channel->attr.num_subbuf);
 529         MSG("%sswitch timer interval: %u", indent6, channel->attr.switch_timer_interval);
 530         MSG("%sread timer interval: %u", indent6, channel->attr.read_timer_interval);
 531         switch (channel->attr.output) {
 532                 case LTTNG_EVENT_SPLICE:
 533                         MSG("%soutput: splice()", indent6);
 534                         break;
 535                 case LTTNG_EVENT_MMAP:
 536                         MSG("%soutput: mmap()", indent6);
 537                         break;
 538         }
 539 }
 540
 541 /*
 542  * List channel(s) of session and domain.
 543  *
 544  * If channel_name is NULL, all channels are listed.
 545  */
 546 static int list_channels(const char *channel_name)
 547 {
 548         int count, i, ret = CMD_SUCCESS;
 549         unsigned int chan_found = 0;
 550         struct lttng_channel *channels = NULL;
 551
 552         DBG("Listing channel(s) (%s)", channel_name ? : "<all>");
 553
 554         count = lttng_list_channels(handle, &channels);
 555         if (count < 0) {
 556                 switch (-count) {
 557                 case LTTNG_ERR_KERN_CHAN_NOT_FOUND:
 558                         ret = CMD_SUCCESS;
 559                         WARN("No kernel channel");
 560                         break;
 561                 default:
 562                         /* We had a real error */
 563                         ret = count;
 564                         ERR("%s", lttng_strerror(ret));
 565                         break;
 566                 }
 567                 goto error_channels;
 568         }
 569
 570         if (channel_name == NULL) {
 571                 MSG("Channels:\n-------------");
 572         }
 573
 574         for (i = 0; i < count; i++) {
 575                 if (channel_name != NULL) {
 576                         if (strncmp(channels[i].name, channel_name, NAME_MAX) == 0) {
 577                                 chan_found = 1;
 578                         } else {
 579                                 continue;
 580                         }
 581                 }
 582                 print_channel(&channels[i]);
 583
 584                 /* Listing events per channel */
 585                 ret = list_events(channels[i].name);
 586                 if (ret < 0) {
 587                         ERR("%s", lttng_strerror(ret));
 588                 }
 589
 590                 if (chan_found) {
 591                         break;
 592                 }
 593         }
 594
 595         if (!chan_found && channel_name != NULL) {
 596                 ERR("Channel %s not found", channel_name);
 597                 goto error;
 598         }
 599
 600         ret = CMD_SUCCESS;
 601
 602 error:
 603         free(channels);
 604
 605 error_channels:
 606         return ret;
 607 }
 608
 609 /*
 610  * List available tracing session. List only basic information.
 611  *
 612  * If session_name is NULL, all sessions are listed.
 613  */
 614 static int list_sessions(const char *session_name)
 615 {
 616         int ret, count, i;
 617         unsigned int session_found = 0;
 618         struct lttng_session *sessions;
 619
 620         count = lttng_list_sessions(&sessions);
 621         DBG("Session count %d", count);
 622         if (count < 0) {
 623                 ret = count;
 624                 ERR("%s", lttng_strerror(ret));
 625                 goto error;
 626         } else if (count == 0) {
 627                 MSG("Currently no available tracing session");
 628                 goto end;
 629         }
 630
 631         if (session_name == NULL) {
 632                 MSG("Available tracing sessions:");
 633         }
 634
 635         for (i = 0; i < count; i++) {
 636                 if (session_name != NULL) {
 637                         if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
 638                                 session_found = 1;
 639                                 MSG("Tracing session %s: [%s%s]", session_name,
 640                                                 active_string(sessions[i].enabled),
 641                                                 snapshot_string(sessions[i].snapshot_mode));
 642                                 MSG("%sTrace path: %s\n", indent4, sessions[i].path);
 643                                 break;
 644                         }
 645                 } else {
 646                         MSG("  %d) %s (%s) [%s%s]", i + 1, sessions[i].name, sessions[i].path,
 647                                         active_string(sessions[i].enabled),
 648                                         snapshot_string(sessions[i].snapshot_mode));
 649                 }
 650         }
 651
 652         free(sessions);
 653
 654         if (!session_found && session_name != NULL) {
 655                 ERR("Session '%s' not found", session_name);
 656                 ret = CMD_ERROR;
 657                 goto error;
 658         }
 659
 660         if (session_name == NULL) {
 661                 MSG("\nUse lttng list <session_name> for more details");
 662         }
 663
 664 end:
 665         return CMD_SUCCESS;
 666
 667 error:
 668         return ret;
 669 }
 670
 671 /*
 672  * List available domain(s) for a session.
 673  */
 674 static int list_domains(const char *session_name)
 675 {
 676         int i, count, ret = CMD_SUCCESS;
 677         struct lttng_domain *domains = NULL;
 678
 679         MSG("Domains:\n-------------");
 680
 681         count = lttng_list_domains(session_name, &domains);
 682         if (count < 0) {
 683                 ret = count;
 684                 ERR("%s", lttng_strerror(ret));
 685                 goto error;
 686         } else if (count == 0) {
 687                 MSG("  None");
 688                 goto end;
 689         }
 690
 691         for (i = 0; i < count; i++) {
 692                 switch (domains[i].type) {
 693                 case LTTNG_DOMAIN_KERNEL:
 694                         MSG("  - Kernel");
 695                         break;
 696                 case LTTNG_DOMAIN_UST:
 697                         MSG("  - UST global");
 698                         break;
 699                 default:
 700                         break;
 701                 }
 702         }
 703
 704 end:
 705         free(domains);
 706
 707 error:
 708         return ret;
 709 }
 710
 711 /*
 712  * The 'list <options>' first level command
 713  */
 714 int cmd_list(int argc, const char **argv)
 715 {
 716         int opt, ret = CMD_SUCCESS;
 717         const char *session_name;
 718         static poptContext pc;
 719         struct lttng_domain domain;
 720         struct lttng_domain *domains = NULL;
 721
 722         memset(&domain, 0, sizeof(domain));
 723
 724         if (argc < 1) {
 725                 usage(stderr);
 726                 ret = CMD_ERROR;
 727                 goto end;
 728         }
 729
 730         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 731         poptReadDefaultConfig(pc, 0);
 732
 733         while ((opt = poptGetNextOpt(pc)) != -1) {
 734                 switch (opt) {
 735                 case OPT_HELP:
 736                         usage(stdout);
 737                         goto end;
 738                 case OPT_USERSPACE:
 739                         opt_userspace = 1;
 740                         break;
 741                 case OPT_LIST_OPTIONS:
 742                         list_cmd_options(stdout, long_options);
 743                         goto end;
 744                 default:
 745                         usage(stderr);
 746                         ret = CMD_UNDEFINED;
 747                         goto end;
 748                 }
 749         }
 750
 751         /* Get session name (trailing argument) */
 752         session_name = poptGetArg(pc);
 753         DBG2("Session name: %s", session_name);
 754
 755         if (opt_kernel) {
 756                 domain.type = LTTNG_DOMAIN_KERNEL;
 757         } else if (opt_userspace) {
 758                 DBG2("Listing userspace global domain");
 759                 domain.type = LTTNG_DOMAIN_UST;
 760         }
 761
 762         if (opt_kernel || opt_userspace) {
 763                 handle = lttng_create_handle(session_name, &domain);
 764                 if (handle == NULL) {
 765                         ret = CMD_FATAL;
 766                         goto end;
 767                 }
 768         }
 769
 770         if (session_name == NULL) {
 771                 if (!opt_kernel && !opt_userspace) {
 772                         ret = list_sessions(NULL);
 773                         if (ret != 0) {
 774                                 goto end;
 775                         }
 776                 }
 777                 if (opt_kernel) {
 778                         ret = list_kernel_events();
 779                         if (ret < 0) {
 780                                 ret = CMD_ERROR;
 781                                 goto end;
 782                         }
 783                 }
 784                 if (opt_userspace) {
 785                         if (opt_fields) {
 786                                 ret = list_ust_event_fields();
 787                         } else {
 788                                 ret = list_ust_events();
 789                         }
 790                         if (ret < 0) {
 791                                 ret = CMD_ERROR;
 792                                 goto end;
 793                         }
 794                 }
 795         } else {
 796                 /* List session attributes */
 797                 ret = list_sessions(session_name);
 798                 if (ret != 0) {
 799                         goto end;
 800                 }
 801
 802                 /* Domain listing */
 803                 if (opt_domain) {
 804                         ret = list_domains(session_name);
 805                         goto end;
 806                 }
 807
 808                 if (opt_kernel || opt_userspace) {
 809                         /* Channel listing */
 810                         ret = list_channels(opt_channel);
 811                         if (ret < 0) {
 812                                 goto end;
 813                         }
 814                 } else {
 815                         int i, nb_domain;
 816
 817                         /* We want all domain(s) */
 818                         nb_domain = lttng_list_domains(session_name, &domains);
 819                         if (nb_domain < 0) {
 820                                 ret = nb_domain;
 821                                 ERR("%s", lttng_strerror(ret));
 822                                 goto end;
 823                         }
 824
 825                         for (i = 0; i < nb_domain; i++) {
 826                                 switch (domains[i].type) {
 827                                 case LTTNG_DOMAIN_KERNEL:
 828                                         MSG("=== Domain: Kernel ===\n");
 829                                         break;
 830                                 case LTTNG_DOMAIN_UST:
 831                                         MSG("=== Domain: UST global ===\n");
 832                                         MSG("Buffer type: %s\n",
 833                                                         domains[i].buf_type ==
 834                                                         LTTNG_BUFFER_PER_PID ? "per PID" : "per UID");
 835                                         break;
 836                                 default:
 837                                         MSG("=== Domain: Unimplemented ===\n");
 838                                         break;
 839                                 }
 840
 841                                 /* Clean handle before creating a new one */
 842                                 if (handle) {
 843                                         lttng_destroy_handle(handle);
 844                                 }
 845
 846                                 handle = lttng_create_handle(session_name, &domains[i]);
 847                                 if (handle == NULL) {
 848                                         ret = CMD_FATAL;
 849                                         goto end;
 850                                 }
 851
 852                                 ret = list_channels(opt_channel);
 853                                 if (ret < 0) {
 854                                         goto end;
 855                                 }
 856                         }
 857                 }
 858         }
 859
 860 end:
 861         free(domains);
 862         if (handle) {
 863                 lttng_destroy_handle(handle);
 864         }
 865
 866         poptFreeContext(pc);
 867         return ret;
 868 }