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