src/bin/lttng/commands/track-untrack.c

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  * Copyright (C) 2015 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  *
   5  * This program is free software; you can redistribute it and/or modify
   6  * it under the terms of the GNU General Public License, version 2 only,
   7  * as published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along
  15  * with this program; if not, write to the Free Software Foundation, Inc.,
  16  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #define _LGPL_SOURCE
  20 #include <ctype.h>
  21 #include <popt.h>
  22 #include <stdbool.h>
  23 #include <stdio.h>
  24 #include <stdlib.h>
  25 #include <string.h>
  26 #include <sys/stat.h>
  27 #include <sys/types.h>
  28 #include <unistd.h>
  29 #include <assert.h>
  30
  31 #include <urcu/list.h>
  32
  33 #include <common/mi-lttng.h>
  34
  35 #include "../command.h"
  36
  37 enum cmd_type {
  38         CMD_TRACK,
  39         CMD_UNTRACK,
  40 };
  41
  42 enum tracker_type_state {
  43         STATE_NONE = 0,
  44         STATE_PID,
  45         STATE_VPID,
  46         STATE_UID,
  47         STATE_VUID,
  48         STATE_GID,
  49         STATE_VGID,
  50 };
  51
  52 struct opt_type {
  53         int used;
  54         int all;
  55         char *string;
  56 };
  57
  58 struct id_list {
  59         size_t nr;
  60         struct lttng_tracker_id **array;
  61 };
  62
  63 static char *opt_session_name;
  64 static int opt_kernel;
  65 static int opt_userspace;
  66
  67 static struct opt_type opt_pid, opt_vpid, opt_uid, opt_vuid, opt_gid, opt_vgid;
  68
  69 static enum tracker_type_state type_state;
  70
  71 enum {
  72         OPT_HELP = 1,
  73         OPT_LIST_OPTIONS,
  74         OPT_SESSION,
  75         OPT_PID,
  76         OPT_VPID,
  77         OPT_UID,
  78         OPT_VUID,
  79         OPT_GID,
  80         OPT_VGID,
  81         OPT_ALL,
  82 };
  83
  84 static struct poptOption long_options[] = {
  85         /* { longName, shortName, argInfo, argPtr, value, descrip, argDesc, } */
  86         { "help",               'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0, },
  87         { "session",            's', POPT_ARG_STRING, &opt_session_name, OPT_SESSION, 0, 0, },
  88         { "kernel",             'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0, },
  89         { "userspace",          'u', POPT_ARG_VAL, &opt_userspace, 1, 0, 0, },
  90         { "pid",                'p', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_pid.string, OPT_PID, 0, 0, },
  91         { "vpid",               0, POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_vpid.string, OPT_VPID, 0, 0, },
  92         { "uid",                0, POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_uid.string, OPT_UID, 0, 0, },
  93         { "vuid",               0, POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_vuid.string, OPT_VUID, 0, 0, },
  94         { "gid",                0, POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_gid.string, OPT_GID, 0, 0, },
  95         { "vgid",               0, POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, &opt_vgid.string, OPT_VGID, 0, 0, },
  96         { "all",                'a', POPT_ARG_NONE, 0, OPT_ALL, 0, 0, },
  97         { "list-options",       0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, 0, 0, },
  98         { 0, 0, 0, 0, 0, 0, 0, },
  99 };
 100
 101 static struct id_list *alloc_id_list(size_t nr_items)
 102 {
 103         struct id_list *id_list;
 104         struct lttng_tracker_id **items;
 105
 106         id_list = zmalloc(sizeof(*id_list));
 107         if (!id_list) {
 108                 goto error;
 109         }
 110         items = zmalloc(nr_items * sizeof(*items));
 111         if (!items) {
 112                 goto error;
 113         }
 114         id_list->nr = nr_items;
 115         id_list->array = items;
 116         return id_list;
 117 error:
 118         free(id_list);
 119         return NULL;
 120 }
 121
 122 static void free_id_list(struct id_list *list)
 123 {
 124         size_t nr_items;
 125         int i;
 126
 127         if (!list) {
 128                 return;
 129         }
 130         nr_items = list->nr;
 131         for (i = 0; i < nr_items; i++) {
 132                 struct lttng_tracker_id *item = list->array[i];
 133                 lttng_tracker_id_destroy(item);
 134         }
 135         free(list);
 136 }
 137
 138 static int parse_id_string(const char *_id_string,
 139                 int all,
 140                 struct id_list **_id_list,
 141                 enum lttng_tracker_type tracker_type)
 142 {
 143         const char *one_id_str;
 144         char *iter;
 145         int retval = CMD_SUCCESS;
 146         int count = 0;
 147         struct id_list *id_list = NULL;
 148         char *id_string = NULL;
 149         char *endptr;
 150
 151         if (all && _id_string) {
 152                 ERR("An empty ID string is expected with --all");
 153                 retval = CMD_ERROR;
 154                 goto error;
 155         }
 156         if (!all && !_id_string) {
 157                 ERR("An ID string is expected");
 158                 retval = CMD_ERROR;
 159                 goto error;
 160         }
 161         if (all) {
 162                 enum lttng_tracker_id_status status;
 163                 /* Empty `ID string means all IDs */
 164                 id_list = alloc_id_list(1);
 165                 if (!id_list) {
 166                         ERR("Out of memory");
 167                         retval = CMD_ERROR;
 168                         goto error;
 169                 }
 170
 171                 id_list->array[0] = lttng_tracker_id_create();
 172                 if (id_list->array[0] == NULL) {
 173                         ERR("Out of memory");
 174                         retval = CMD_ERROR;
 175                         goto error;
 176                 }
 177
 178                 status = lttng_tracker_id_set_all(id_list->array[0]);
 179                 if (status != LTTNG_TRACKER_ID_STATUS_OK) {
 180                         ERR("Invalid value for tracker id");
 181                         retval = CMD_ERROR;
 182                         goto error;
 183                 }
 184                 goto assign;
 185         }
 186
 187         id_string = strdup(_id_string);
 188         if (!id_string) {
 189                 ERR("Out of memory");
 190                 retval = CMD_ERROR;
 191                 goto error;
 192         }
 193
 194         /* Count */
 195         one_id_str = strtok_r(id_string, ",", &iter);
 196         while (one_id_str != NULL) {
 197                 unsigned long v;
 198
 199                 if (isdigit(one_id_str[0])) {
 200                         errno = 0;
 201                         v = strtoul(one_id_str, &endptr, 10);
 202                         if ((v == 0 && errno == EINVAL) ||
 203                                         (v == ULONG_MAX && errno == ERANGE) ||
 204                                         (*one_id_str != '\0' &&
 205                                                         *endptr != '\0')) {
 206                                 ERR("Error parsing ID %s", one_id_str);
 207                                 retval = CMD_ERROR;
 208                                 goto error;
 209                         }
 210
 211                         if ((long) v > INT_MAX || (int) v < 0) {
 212                                 ERR("Invalid ID value %ld", (long) v);
 213                                 retval = CMD_ERROR;
 214                                 goto error;
 215                         }
 216                 }
 217                 count++;
 218
 219                 /* For next loop */
 220                 one_id_str = strtok_r(NULL, ",", &iter);
 221         }
 222         if (count == 0) {
 223                 ERR("Fatal error occurred when parsing pid string");
 224                 retval = CMD_ERROR;
 225                 goto error;
 226         }
 227
 228         free(id_string);
 229         /* Identity of delimiter has been lost in first pass. */
 230         id_string = strdup(_id_string);
 231         if (!id_string) {
 232                 ERR("Out of memory");
 233                 retval = CMD_ERROR;
 234                 goto error;
 235         }
 236
 237         /* Allocate */
 238         id_list = alloc_id_list(count);
 239         if (!id_list) {
 240                 ERR("Out of memory");
 241                 retval = CMD_ERROR;
 242                 goto error;
 243         }
 244
 245         /* Reparse string and populate the id list. */
 246         count = 0;
 247         one_id_str = strtok_r(id_string, ",", &iter);
 248         while (one_id_str != NULL) {
 249                 enum lttng_tracker_id_status status;
 250                 struct lttng_tracker_id *item;
 251                 item = lttng_tracker_id_create();
 252                 if (item == NULL) {
 253                         ERR("Out of memory");
 254                         retval = CMD_ERROR;
 255                         goto error;
 256                 }
 257
 258                 id_list->array[count++] = item;
 259                 if (isdigit(one_id_str[0])) {
 260                         unsigned long v;
 261
 262                         v = strtoul(one_id_str, NULL, 10);
 263                         status = lttng_tracker_id_set_value(item, (int) v);
 264                         if (status == LTTNG_TRACKER_ID_STATUS_INVALID) {
 265                                 ERR("Invalid value");
 266                                 retval = CMD_ERROR;
 267                                 goto error;
 268                         }
 269                 } else {
 270                         status = lttng_tracker_id_set_string(item, one_id_str);
 271                         if (status == LTTNG_TRACKER_ID_STATUS_INVALID) {
 272                                 ERR("Failed to set ID string");
 273                                 retval = CMD_ERROR;
 274                                 goto error;
 275                         }
 276                 }
 277
 278                 /* For next loop */
 279                 one_id_str = strtok_r(NULL, ",", &iter);
 280         }
 281
 282 assign:
 283         /* SUCCESS */
 284         *_id_list = id_list;
 285         goto end;
 286
 287 error:
 288         /* ERROR */
 289         free_id_list(id_list);
 290 end:
 291         free(id_string);
 292         return retval;
 293 }
 294
 295 static const char *get_tracker_str(enum lttng_tracker_type tracker_type)
 296 {
 297         switch (tracker_type) {
 298         case LTTNG_TRACKER_PID:
 299                 return "PID";
 300         case LTTNG_TRACKER_VPID:
 301                 return "VPID";
 302         case LTTNG_TRACKER_UID:
 303                 return "UID";
 304         case LTTNG_TRACKER_VUID:
 305                 return "VUID";
 306         case LTTNG_TRACKER_GID:
 307                 return "GID";
 308         case LTTNG_TRACKER_VGID:
 309                 return "VGID";
 310         default:
 311                 return NULL;
 312         }
 313         return NULL;
 314 }
 315
 316 static int ust_tracker_type_support(enum lttng_tracker_type *tracker_type)
 317 {
 318         int ret;
 319
 320         switch (*tracker_type) {
 321         case LTTNG_TRACKER_PID:
 322                 *tracker_type = LTTNG_TRACKER_VPID;
 323                 ret = 0;
 324                 break;
 325         case LTTNG_TRACKER_VPID:
 326         case LTTNG_TRACKER_VUID:
 327         case LTTNG_TRACKER_VGID:
 328                 ret = 0;
 329                 break;
 330         case LTTNG_TRACKER_UID:
 331         case LTTNG_TRACKER_GID:
 332                 ERR("The %s tracker is invalid for UST domain.",
 333                                 get_tracker_str(*tracker_type));
 334                 ret = -1;
 335                 break;
 336         default:
 337                 ret = -1;
 338                 break;
 339         }
 340
 341         return ret;
 342 }
 343
 344 static enum cmd_error_code track_untrack_id(enum cmd_type cmd_type,
 345                 const char *cmd_str,
 346                 const char *session_name,
 347                 const char *id_string,
 348                 int all,
 349                 struct mi_writer *writer,
 350                 enum lttng_tracker_type tracker_type)
 351 {
 352         int ret, success = 1 , i;
 353         enum cmd_error_code retval = CMD_SUCCESS;
 354         struct id_list *id_list = NULL;
 355         struct lttng_domain dom;
 356         struct lttng_handle *handle = NULL;
 357         int (*cmd_func)(struct lttng_handle *handle,
 358                         enum lttng_tracker_type tracker_type,
 359                         const struct lttng_tracker_id *id);
 360         const char *tracker_str;
 361
 362         switch (cmd_type) {
 363         case CMD_TRACK:
 364                 cmd_func = lttng_track_id;
 365                 break;
 366         case CMD_UNTRACK:
 367                 cmd_func = lttng_untrack_id;
 368                 break;
 369         default:
 370                 ERR("Unknown command");
 371                 retval = CMD_ERROR;
 372                 goto end;
 373         }
 374         memset(&dom, 0, sizeof(dom));
 375         if (opt_kernel) {
 376                 dom.type = LTTNG_DOMAIN_KERNEL;
 377         } else if (opt_userspace) {
 378                 dom.type = LTTNG_DOMAIN_UST;
 379                 ret = ust_tracker_type_support(&tracker_type);
 380                 if (ret) {
 381                         ERR("Invalid parameter");
 382                         retval = CMD_ERROR;
 383                         goto end;
 384                 }
 385         } else {
 386                 /* Checked by the caller. */
 387                 assert(0);
 388         }
 389         tracker_str = get_tracker_str(tracker_type);
 390         if (!tracker_str) {
 391                 ERR("Unknown tracker type");
 392                 retval = CMD_ERROR;
 393                 goto end;
 394         }
 395         ret = parse_id_string(id_string, all, &id_list, tracker_type);
 396         if (ret != CMD_SUCCESS) {
 397                 ERR("Error parsing %s string", tracker_str);
 398                 retval = CMD_ERROR;
 399                 goto end;
 400         }
 401
 402         handle = lttng_create_handle(session_name, &dom);
 403         if (handle == NULL) {
 404                 retval = CMD_ERROR;
 405                 goto end;
 406         }
 407
 408         if (writer) {
 409                 /* Open tracker_id and targets elements */
 410                 ret = mi_lttng_id_tracker_open(writer, tracker_type);
 411                 if (ret) {
 412                         goto end;
 413                 }
 414         }
 415
 416         for (i = 0; i < id_list->nr; i++) {
 417                 struct lttng_tracker_id *item = id_list->array[i];
 418                 enum lttng_tracker_id_type type =
 419                                 lttng_tracker_id_get_type(item);
 420                 enum lttng_tracker_id_status status =
 421                                 LTTNG_TRACKER_ID_STATUS_OK;
 422                 int value;
 423                 const char *value_string;
 424
 425                 switch (type) {
 426                 case LTTNG_ID_ALL:
 427                         /* Nothing to check */
 428                         break;
 429                 case LTTNG_ID_VALUE:
 430                         status = lttng_tracker_id_get_value(item, &value);
 431                         break;
 432                 case LTTNG_ID_STRING:
 433                         status = lttng_tracker_id_get_string(
 434                                         item, &value_string);
 435                         break;
 436                 default:
 437                         retval = CMD_ERROR;
 438                         goto end;
 439                 }
 440
 441                 if (status != LTTNG_TRACKER_ID_STATUS_OK) {
 442                         ERR("Tracker id object is in an invalid state");
 443                         retval = CMD_ERROR;
 444                         goto end;
 445                 }
 446
 447                 switch (type) {
 448                 case LTTNG_ID_ALL:
 449                         DBG("%s all IDs", cmd_str);
 450                         break;
 451                 case LTTNG_ID_VALUE:
 452                         DBG("%s ID %d", cmd_str, value);
 453                         break;
 454                 case LTTNG_ID_STRING:
 455                         DBG("%s ID '%s'", cmd_str, value_string);
 456                         break;
 457                 default:
 458                         retval = CMD_ERROR;
 459                         goto end;
 460                 }
 461
 462                 ret = cmd_func(handle, tracker_type, item);
 463                 if (ret) {
 464                         char *msg = NULL;
 465
 466                         switch (-ret) {
 467                         case LTTNG_ERR_ID_TRACKED:
 468                                 msg = "already tracked";
 469                                 success = 1;
 470                                 retval = CMD_SUCCESS;
 471                                 break;
 472                         case LTTNG_ERR_ID_NOT_TRACKED:
 473                                 msg = "already not tracked";
 474                                 success = 1;
 475                                 retval = CMD_SUCCESS;
 476                                 break;
 477                         default:
 478                                 ERR("%s", lttng_strerror(ret));
 479                                 success = 0;
 480                                 retval = CMD_ERROR;
 481                                 break;
 482                         }
 483                         if (msg) {
 484                                 switch (type) {
 485                                 case LTTNG_ID_ALL:
 486                                         WARN("All %ss %s in session %s",
 487                                                         tracker_str, msg,
 488                                                         session_name);
 489                                         break;
 490                                 case LTTNG_ID_VALUE:
 491                                         WARN("%s %i %s in session %s",
 492                                                         tracker_str, value, msg,
 493                                                         session_name);
 494                                         break;
 495                                 case LTTNG_ID_STRING:
 496                                         WARN("%s '%s' %s in session %s",
 497                                                         tracker_str,
 498                                                         value_string, msg,
 499                                                         session_name);
 500                                         break;
 501                                 default:
 502                                         retval = CMD_ERROR;
 503                                         goto end;
 504                                 }
 505                         }
 506                 } else {
 507                         switch (type) {
 508                         case LTTNG_ID_ALL:
 509                                 MSG("All %ss %sed in session %s", tracker_str,
 510                                                 cmd_str, session_name);
 511                                 break;
 512                         case LTTNG_ID_VALUE:
 513                                 MSG("%s %i %sed in session %s", tracker_str,
 514                                                 value, cmd_str, session_name);
 515                                 break;
 516                         case LTTNG_ID_STRING:
 517                                 MSG("%s '%s' %sed in session %s", tracker_str,
 518                                                 value_string, cmd_str,
 519                                                 session_name);
 520                                 break;
 521                         default:
 522                                 retval = CMD_ERROR;
 523                                 goto end;
 524                         }
 525                         success = 1;
 526                 }
 527
 528                 /* Mi */
 529                 if (writer) {
 530                         ret = mi_lttng_id_target(writer, tracker_type, item, 1);
 531                         if (ret) {
 532                                 retval = CMD_ERROR;
 533                                 goto end;
 534                         }
 535
 536                         ret = mi_lttng_writer_write_element_bool(writer,
 537                                         mi_lttng_element_success, success);
 538                         if (ret) {
 539                                 retval = CMD_ERROR;
 540                                 goto end;
 541                         }
 542
 543                         ret = mi_lttng_writer_close_element(writer);
 544                         if (ret) {
 545                                 retval = CMD_ERROR;
 546                                 goto end;
 547                         }
 548                 }
 549         }
 550
 551         if (writer) {
 552                 /* Close targets and tracker_id elements */
 553                 ret = mi_lttng_close_multi_element(writer, 2);
 554                 if (ret) {
 555                         retval = CMD_ERROR;
 556                         goto end;
 557                 }
 558         }
 559
 560 end:
 561         if (handle) {
 562                 lttng_destroy_handle(handle);
 563         }
 564         free_id_list(id_list);
 565         return retval;
 566 }
 567
 568 static
 569 const char *get_mi_element_command(enum cmd_type cmd_type)
 570 {
 571         switch (cmd_type) {
 572         case CMD_TRACK:
 573                 return mi_lttng_element_command_track;
 574         case CMD_UNTRACK:
 575                 return mi_lttng_element_command_untrack;
 576         default:
 577                 return NULL;
 578         }
 579 }
 580
 581 static void print_err_duplicate(const char *type)
 582 {
 583         ERR("The --%s option can only be used once. A list of comma-separated values can be specified.",
 584                         type);
 585 }
 586
 587 /*
 588  * Add/remove tracker to/from session.
 589  */
 590 static
 591 int cmd_track_untrack(enum cmd_type cmd_type, const char *cmd_str,
 592                 int argc, const char **argv, const char *help_msg)
 593 {
 594         int opt, ret = 0, success = 1;
 595         bool opt_all_present = false;
 596         enum cmd_error_code command_ret = CMD_SUCCESS;
 597         static poptContext pc;
 598         char *session_name = NULL;
 599         const char *leftover = NULL;
 600         struct mi_writer *writer = NULL;
 601
 602         if (argc < 1) {
 603                 command_ret = CMD_ERROR;
 604                 goto end;
 605         }
 606
 607         pc = poptGetContext(NULL, argc, argv, long_options, 0);
 608         poptReadDefaultConfig(pc, 0);
 609
 610         while ((opt = poptGetNextOpt(pc)) != -1) {
 611                 switch (opt) {
 612                 case OPT_HELP:
 613                         SHOW_HELP();
 614                         goto end;
 615                 case OPT_LIST_OPTIONS:
 616                         list_cmd_options(stdout, long_options);
 617                         goto end;
 618                 case OPT_SESSION:
 619                         break;
 620                 case OPT_PID:
 621                         if (opt_pid.used) {
 622                                 print_err_duplicate("pid");
 623                                 command_ret = CMD_ERROR;
 624                                 goto end;
 625                         }
 626                         opt_pid.used = 1;
 627                         type_state = STATE_PID;
 628                         break;
 629                 case OPT_VPID:
 630                         if (opt_vpid.used) {
 631                                 print_err_duplicate("vpid");
 632                                 command_ret = CMD_ERROR;
 633                                 goto end;
 634                         }
 635                         opt_vpid.used = 1;
 636                         type_state = STATE_VPID;
 637                         break;
 638                 case OPT_UID:
 639                         if (opt_uid.used) {
 640                                 print_err_duplicate("uid");
 641                                 command_ret = CMD_ERROR;
 642                                 goto end;
 643                         }
 644                         opt_uid.used = 1;
 645                         type_state = STATE_UID;
 646                         break;
 647                 case OPT_VUID:
 648                         if (opt_vuid.used) {
 649                                 print_err_duplicate("vuid");
 650                                 command_ret = CMD_ERROR;
 651                                 goto end;
 652                         }
 653                         opt_vuid.used = 1;
 654                         type_state = STATE_VUID;
 655                         break;
 656                 case OPT_GID:
 657                         if (opt_gid.used) {
 658                                 print_err_duplicate("gid");
 659                                 command_ret = CMD_ERROR;
 660                                 goto end;
 661                         }
 662                         opt_gid.used = 1;
 663                         type_state = STATE_GID;
 664                         break;
 665                 case OPT_VGID:
 666                         if (opt_vgid.used) {
 667                                 print_err_duplicate("vgid");
 668                                 command_ret = CMD_ERROR;
 669                                 goto end;
 670                         }
 671                         opt_vgid.used = 1;
 672                         type_state = STATE_VGID;
 673                         break;
 674                 case OPT_ALL:
 675                         opt_all_present = true;
 676                         break;
 677                 default:
 678                         command_ret = CMD_UNDEFINED;
 679                         goto end;
 680                 }
 681         }
 682
 683         ret = print_missing_or_multiple_domains(opt_kernel + opt_userspace);
 684         if (ret) {
 685                 command_ret = CMD_ERROR;
 686                 goto end;
 687         }
 688
 689         /*
 690          * If the `--all` option is present set the appropriate tracker's `all`
 691          * field.
 692          */
 693         if (opt_all_present) {
 694                 switch (type_state) {
 695                 case STATE_PID:
 696                         opt_pid.all = 1;
 697                         break;
 698                 case STATE_VPID:
 699                         opt_vpid.all = 1;
 700                         break;
 701                 case STATE_UID:
 702                         opt_uid.all = 1;
 703                         break;
 704                 case STATE_VUID:
 705                         opt_vuid.all = 1;
 706                         break;
 707                 case STATE_GID:
 708                         opt_gid.all = 1;
 709                         break;
 710                 case STATE_VGID:
 711                         opt_vgid.all = 1;
 712                         break;
 713                 default:
 714                         command_ret = CMD_ERROR;
 715                         goto end;
 716                 }
 717         }
 718
 719         if (!opt_session_name) {
 720                 session_name = get_session_name();
 721                 if (session_name == NULL) {
 722                         command_ret = CMD_ERROR;
 723                         goto end;
 724                 }
 725         } else {
 726                 session_name = opt_session_name;
 727         }
 728
 729         leftover = poptGetArg(pc);
 730         if (leftover) {
 731                 ERR("Unknown argument: %s", leftover);
 732                 ret = CMD_ERROR;
 733                 goto end;
 734         }
 735
 736         /* Mi check */
 737         if (lttng_opt_mi) {
 738                 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
 739                 if (!writer) {
 740                         command_ret = CMD_ERROR;
 741                         goto end;
 742                 }
 743         }
 744
 745         if (writer) {
 746                 /* Open command element */
 747                 ret = mi_lttng_writer_command_open(writer,
 748                                 get_mi_element_command(cmd_type));
 749                 if (ret) {
 750                         command_ret = CMD_ERROR;
 751                         goto end;
 752                 }
 753
 754                 /* Open output element */
 755                 ret = mi_lttng_writer_open_element(writer,
 756                                 mi_lttng_element_command_output);
 757                 if (ret) {
 758                         command_ret = CMD_ERROR;
 759                         goto end;
 760                 }
 761
 762                 ret = mi_lttng_trackers_open(writer);
 763                 if (ret) {
 764                         goto end;
 765                 }
 766         }
 767
 768         if (opt_pid.used) {
 769                 command_ret = track_untrack_id(cmd_type, cmd_str, session_name,
 770                                 opt_pid.string, opt_pid.all, writer,
 771                                 LTTNG_TRACKER_PID);
 772                 if (command_ret != CMD_SUCCESS) {
 773                         success = 0;
 774                 }
 775         }
 776         if (opt_vpid.used) {
 777                 command_ret = track_untrack_id(cmd_type, cmd_str, session_name,
 778                                 opt_vpid.string, opt_vpid.all, writer,
 779                                 LTTNG_TRACKER_VPID);
 780                 if (command_ret != CMD_SUCCESS) {
 781                         success = 0;
 782                 }
 783         }
 784         if (opt_uid.used) {
 785                 command_ret = track_untrack_id(cmd_type, cmd_str, session_name,
 786                                 opt_uid.string, opt_uid.all, writer,
 787                                 LTTNG_TRACKER_UID);
 788                 if (command_ret != CMD_SUCCESS) {
 789                         success = 0;
 790                 }
 791         }
 792         if (opt_vuid.used) {
 793                 command_ret = track_untrack_id(cmd_type, cmd_str, session_name,
 794                                 opt_vuid.string, opt_vuid.all, writer,
 795                                 LTTNG_TRACKER_VUID);
 796                 if (command_ret != CMD_SUCCESS) {
 797                         success = 0;
 798                 }
 799         }
 800         if (opt_gid.used) {
 801                 command_ret = track_untrack_id(cmd_type, cmd_str, session_name,
 802                                 opt_gid.string, opt_gid.all, writer,
 803                                 LTTNG_TRACKER_GID);
 804                 if (command_ret != CMD_SUCCESS) {
 805                         success = 0;
 806                 }
 807         }
 808         if (opt_vgid.used) {
 809                 command_ret = track_untrack_id(cmd_type, cmd_str, session_name,
 810                                 opt_vgid.string, opt_vgid.all, writer,
 811                                 LTTNG_TRACKER_VGID);
 812                 if (command_ret != CMD_SUCCESS) {
 813                         success = 0;
 814                 }
 815         }
 816
 817         /* Mi closing */
 818         if (writer) {
 819                 /* Close trackers and output elements */
 820                 ret = mi_lttng_close_multi_element(writer, 2);
 821                 if (ret) {
 822                         command_ret = CMD_ERROR;
 823                         goto end;
 824                 }
 825
 826                 /* Success ? */
 827                 ret = mi_lttng_writer_write_element_bool(writer,
 828                                 mi_lttng_element_command_success, success);
 829                 if (ret) {
 830                         command_ret = CMD_ERROR;
 831                         goto end;
 832                 }
 833
 834                 /* Command element close */
 835                 ret = mi_lttng_writer_command_close(writer);
 836                 if (ret) {
 837                         command_ret = CMD_ERROR;
 838                         goto end;
 839                 }
 840         }
 841
 842 end:
 843         if (!opt_session_name) {
 844                 free(session_name);
 845         }
 846
 847         /* Mi clean-up */
 848         if (writer && mi_lttng_writer_destroy(writer)) {
 849                 /* Preserve original error code */
 850                 command_ret = CMD_ERROR;
 851         }
 852
 853         poptFreeContext(pc);
 854         return (int) command_ret;
 855 }
 856
 857 int cmd_track(int argc, const char **argv)
 858 {
 859         static const char *help_msg =
 860 #ifdef LTTNG_EMBED_HELP
 861 #include <lttng-track.1.h>
 862 #else
 863         NULL
 864 #endif
 865         ;
 866
 867         return cmd_track_untrack(CMD_TRACK, "track", argc, argv, help_msg);
 868 }
 869
 870 int cmd_untrack(int argc, const char **argv)
 871 {
 872         static const char *help_msg =
 873 #ifdef LTTNG_EMBED_HELP
 874 #include <lttng-untrack.1.h>
 875 #else
 876         NULL
 877 #endif
 878         ;
 879
 880         return cmd_track_untrack(CMD_UNTRACK, "untrack", argc, argv, help_msg);
 881 }