src/bin/lttng/commands/create.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 _LGPL_SOURCE
  19 #include <assert.h>
  20 #include <ctype.h>
  21 #include <popt.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <sys/stat.h>
  26 #include <sys/types.h>
  27 #include <time.h>
  28 #include <unistd.h>
  29 #include <signal.h>
  30 #include <sys/wait.h>
  31
  32 #include <common/mi-lttng.h>
  33 #include <common/config/session-config.h>
  34
  35 #include "../command.h"
  36 #include "../utils.h"
  37
  38 #include <common/defaults.h>
  39 #include <common/sessiond-comm/sessiond-comm.h>
  40 #include <common/uri.h>
  41 #include <common/utils.h>
  42 #include <lttng/snapshot.h>
  43
  44 static char *opt_output_path;
  45 static char *opt_session_name;
  46 static char *opt_url;
  47 static char *opt_ctrl_url;
  48 static char *opt_data_url;
  49 static char *opt_shm_path;
  50 static char *opt_template_path;
  51 static int opt_no_consumer;
  52 static int opt_no_output;
  53 static int opt_snapshot;
  54 static unsigned int opt_live_timer;
  55 static bool opt_default_name;
  56 static bool opt_default_output;
  57
  58 enum {
  59         OPT_HELP = 1,
  60         OPT_LIST_OPTIONS,
  61         OPT_LIVE_TIMER,
  62         OPT_DEFAULT_NAME,
  63         OPT_DEFAULT_OUTPUT,
  64 };
  65
  66 enum output_type {
  67         OUTPUT_UNKNOWN = -1,
  68         OUTPUT_NONE,
  69         OUTPUT_LOCAL,
  70         OUTPUT_NET,
  71 };
  72 enum session_type {
  73         SESSION_UNKNOWN = -1,
  74         SESSION_NORMAL,
  75         SESSION_LIVE,
  76         SESSION_SNAPSHOT,
  77 };
  78
  79
  80 static struct mi_writer *writer;
  81
  82 static struct poptOption long_options[] = {
  83         /* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
  84         {"help", 'h', POPT_ARG_NONE, NULL, OPT_HELP, NULL, NULL},
  85         {"output", 'o', POPT_ARG_STRING, &opt_output_path, 0, NULL, NULL},
  86         {"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
  87         {"set-url",        'U', POPT_ARG_STRING, &opt_url, 0, 0, 0},
  88         {"ctrl-url",       'C', POPT_ARG_STRING, &opt_ctrl_url, 0, 0, 0},
  89         {"data-url",       'D', POPT_ARG_STRING, &opt_data_url, 0, 0, 0},
  90         {"no-output",       0, POPT_ARG_VAL, &opt_no_output, 1, 0, 0},
  91         {"no-consumer",     0, POPT_ARG_VAL, &opt_no_consumer, 1, 0, 0},
  92         {"snapshot",        0, POPT_ARG_VAL, &opt_snapshot, 1, 0, 0},
  93         {"live",            0, POPT_ARG_INT | POPT_ARGFLAG_OPTIONAL, 0, OPT_LIVE_TIMER, 0, 0},
  94         {"shm-path",        0, POPT_ARG_STRING, &opt_shm_path, 0, 0, 0},
  95         {"template-path",        0, POPT_ARG_STRING, &opt_template_path, 0, 0, 0},
  96         {"default-name",    0, POPT_ARG_NONE, NULL, OPT_DEFAULT_NAME, 0, 0},
  97         {"default-output",  0, POPT_ARG_NONE, NULL, OPT_DEFAULT_OUTPUT, 0, 0},
  98         {0, 0, 0, 0, 0, 0, 0}
  99 };
 100
 101 /*
 102  * Please have a look at src/lib/lttng-ctl/lttng-ctl.c for more information on
 103  * why this declaration exists and used ONLY in for this command.
 104  */
 105 extern int _lttng_create_session_ext(const char *name, const char *url,
 106                 const char *datetime);
 107
 108 /*
 109  * Retrieve the created session and mi output it based on provided argument
 110  * This is currently a summary of what was pretty printed and is subject to
 111  * enhancements.
 112  */
 113 static int mi_created_session(const char *session_name)
 114 {
 115         int ret, i, count, found;
 116         struct lttng_session *sessions;
 117
 118         /* session_name should not be null */
 119         assert(session_name);
 120         assert(writer);
 121
 122         count = lttng_list_sessions(&sessions);
 123         if (count < 0) {
 124                 ret = count;
 125                 ERR("%s", lttng_strerror(ret));
 126                 goto error;
 127         }
 128
 129         if (count == 0) {
 130                 ERR("Error session creation failed: session %s not found", session_name);
 131                 ret = -LTTNG_ERR_SESS_NOT_FOUND;
 132                 goto end;
 133         }
 134
 135         found = 0;
 136         for (i = 0; i < count; i++) {
 137                 if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
 138                         found = 1;
 139                         ret = mi_lttng_session(writer, &sessions[i], 0);
 140                         if (ret) {
 141                                 goto error;
 142                         }
 143                         break;
 144                 }
 145         }
 146
 147         if (!found) {
 148                 ret = -LTTNG_ERR_SESS_NOT_FOUND;
 149         } else {
 150                 ret = CMD_SUCCESS;
 151         }
 152
 153 error:
 154         free(sessions);
 155 end:
 156         return ret;
 157 }
 158
 159 /*
 160  * For a session name, set the consumer URLs.
 161  */
 162 static int set_consumer_url(const char *session_name, const char *ctrl_url,
 163                 const char *data_url)
 164 {
 165         int ret;
 166         struct lttng_handle *handle;
 167
 168         assert(session_name);
 169
 170         /*
 171          * Set handle with the session_name, but no domain. This implies that
 172          * the actions taken with this handle apply on the tracing session
 173          * rather then the domain-specific session.
 174          */
 175         handle = lttng_create_handle(session_name, NULL);
 176         if (handle == NULL) {
 177                 ret = CMD_FATAL;
 178                 goto error;
 179         }
 180
 181         ret = lttng_set_consumer_url(handle, ctrl_url, data_url);
 182         if (ret < 0) {
 183                 goto error;
 184         }
 185
 186 error:
 187         lttng_destroy_handle(handle);
 188         return ret;
 189 }
 190
 191 static int add_snapshot_output(const char *session_name, const char *ctrl_url,
 192                 const char *data_url)
 193 {
 194         int ret;
 195         struct lttng_snapshot_output *output = NULL;
 196
 197         assert(session_name);
 198
 199         output = lttng_snapshot_output_create();
 200         if (!output) {
 201                 ret = CMD_FATAL;
 202                 goto error_create;
 203         }
 204
 205         if (ctrl_url) {
 206                 ret = lttng_snapshot_output_set_ctrl_url(ctrl_url, output);
 207                 if (ret < 0) {
 208                         goto error;
 209                 }
 210         }
 211
 212         if (data_url) {
 213                 ret = lttng_snapshot_output_set_data_url(data_url, output);
 214                 if (ret < 0) {
 215                         goto error;
 216                 }
 217         }
 218
 219         /* This call, if successful, populates the id of the output object. */
 220         ret = lttng_snapshot_add_output(session_name, output);
 221         if (ret < 0) {
 222                 goto error;
 223         }
 224
 225 error:
 226         lttng_snapshot_output_destroy(output);
 227 error_create:
 228         return ret;
 229 }
 230
 231 /*
 232  * Validate the combinations of passed options
 233  *
 234  * CMD_ERROR on error
 235  * CMD_SUCCESS on success
 236  */
 237 static int validate_command_options(enum session_type type)
 238 {
 239         int ret = CMD_SUCCESS;
 240
 241         if (opt_snapshot && opt_live_timer) {
 242                 ERR("Snapshot and live modes are mutually exclusive.");
 243                 ret = CMD_ERROR;
 244                 goto error;
 245         }
 246
 247         if ((!opt_ctrl_url && opt_data_url) || (opt_ctrl_url && !opt_data_url)) {
 248                 ERR("Control and data URLs must both be set.");
 249                 ret = CMD_ERROR;
 250                 goto error;
 251         }
 252
 253         if (opt_template_path) {
 254                 /* Restriction on flags exist when using template */
 255                 /* Session type flags are not permitted */
 256                 /* --live & --snapshot */
 257                 if ((opt_live_timer && type != SESSION_LIVE) ||
 258                                 (opt_snapshot && type != SESSION_SNAPSHOT)) {
 259                         ERR("It is not possible to change the session type of a template");
 260                         ret = CMD_ERROR;
 261                         goto error;
 262                 }
 263         }
 264
 265         if (opt_session_name && opt_default_name) {
 266                 ERR("A session name must not be provided if the --default-name option is used");
 267                 ret = CMD_ERROR;
 268                 goto error;
 269         }
 270
 271         if (opt_default_output && (opt_data_url || opt_ctrl_url || opt_url ||
 272                         opt_output_path)) {
 273                 ERR("The --default-output option may not be used with the --output/-o, --set-url/-U, --ctrl-url/-C, or --data-url/-D options");
 274                 ret = CMD_ERROR;
 275                 goto error;
 276         }
 277 error:
 278         return ret;
 279 }
 280
 281 /*
 282  * Create a session using direct calls to liblttng-ctl.
 283  *
 284  * Return CMD_SUCCESS on success, negative value on internal lttng errors and positive
 285  * value on command errors.
 286  */
 287 static int create_session_basic (const char *session_name,
 288                 enum session_type session_type,
 289                 int live_timer,
 290                 enum output_type output_type,
 291                 const char* url,
 292                 const char* ctrl_url,
 293                 const char* data_url,
 294                 const char* shm_path,
 295                 const char* datetime)
 296 {
 297         /* Create session based on session creation */
 298         int ret = CMD_SUCCESS;
 299         const char *pathname;
 300
 301         assert(datetime);
 302
 303         if (opt_relayd_path) {
 304                 pathname = opt_relayd_path;
 305         } else {
 306                 pathname = INSTALL_BIN_PATH "/lttng-relayd";
 307         }
 308
 309         switch (session_type) {
 310         case SESSION_NORMAL:
 311                 ret = _lttng_create_session_ext(session_name, url, datetime);
 312                 break;
 313         case SESSION_SNAPSHOT:
 314                 if (output_type == OUTPUT_NONE) {
 315                         ERR("--no-output on a snapshot session is invalid");
 316                         ret = CMD_UNSUPPORTED;
 317                         goto error;
 318                 }
 319                 ret = lttng_create_session_snapshot(session_name, url);
 320                 break;
 321         case SESSION_LIVE:
 322                 if (output_type == OUTPUT_NONE) {
 323                         ERR("--no-output on a live session is invalid");
 324                         ret = CMD_UNSUPPORTED;
 325                         goto error;
 326                 }
 327
 328                 if (output_type == OUTPUT_LOCAL) {
 329                         ERR("Local file output on a live session is invalid");
 330                         ret = CMD_UNSUPPORTED;
 331                         goto error;
 332                 }
 333                 if (output_type != OUTPUT_NET && !check_relayd() &&
 334                                 spawn_relayd(pathname, 0) < 0) {
 335                         ret = CMD_FATAL;
 336                         goto error;
 337                 }
 338                 ret = lttng_create_session_live(session_name, url, live_timer);
 339                 break;
 340         default:
 341                 ERR("Unknown session type");
 342                 ret = CMD_UNDEFINED;
 343                 goto error;
 344         }
 345
 346         if (ret < 0) {
 347                 /* Don't set ret so the sessiond error is propagated. */
 348                 switch (-ret) {
 349                 case LTTNG_ERR_EXIST_SESS:
 350                         WARN("Session %s already exists", session_name);
 351                         break;
 352                 default:
 353                         break;
 354                 }
 355                 goto error;
 356         }
 357
 358         /* Configure the session based on the output type */
 359         switch (output_type) {
 360         case OUTPUT_LOCAL:
 361                 break;
 362         case OUTPUT_NET:
 363                 if (!ctrl_url || !data_url) {
 364                         break;
 365                 }
 366
 367                 if (session_type == SESSION_SNAPSHOT) {
 368                         ret = add_snapshot_output(session_name, ctrl_url,
 369                                         data_url);
 370                 } else {
 371                         /*
 372                          * Normal sessions and live sessions behave the same way
 373                          * regarding consumer url.
 374                          */
 375                         ret = set_consumer_url(session_name, ctrl_url, data_url);
 376                 }
 377                 if (ret < 0) {
 378                         /* Destroy created session on errors */
 379                         lttng_destroy_session(session_name);
 380                         goto error;
 381                 }
 382                 break;
 383         case OUTPUT_NONE:
 384                 break;
 385         default:
 386                 ERR("Unknown output type");
 387                 ret = CMD_UNDEFINED;
 388                 goto error;
 389         }
 390
 391         /*
 392          * Set the session shared memory path
 393          */
 394         if (shm_path) {
 395                 ret = lttng_set_session_shm_path(session_name, shm_path);
 396                 if (ret < 0) {
 397                         lttng_destroy_session(session_name);
 398                         goto error;
 399                 }
 400         }
 401 error:
 402         return ret;
 403 }
 404
 405 static int generate_output(const char *session_name,
 406                 enum session_type session_type,
 407                 int live_timer,
 408                 enum output_type output_type,
 409                 const char* url,
 410                 const char* ctrl_url,
 411                 const char* data_url,
 412                 const char* shm_path)
 413 {
 414         int ret = CMD_SUCCESS;
 415
 416         /*
 417          * TODO move this to after session name
 418          * for now we only emulate previous behaviour.
 419          */
 420         if (session_type != SESSION_SNAPSHOT) {
 421                 if (ctrl_url) {
 422                         MSG("Control URL %s set for session %s", ctrl_url, session_name);
 423                 }
 424
 425                 if (data_url) {
 426                         MSG("Data URL %s set for session %s", data_url, session_name);
 427                 }
 428         }
 429
 430         if (url && output_type == OUTPUT_LOCAL) {
 431                 /* Remove the file:// */
 432                 if (strlen(url) > strlen("file://")){
 433                         url = url + strlen("file://");
 434                 }
 435         }
 436
 437         MSG("Session %s created.", session_name);
 438         if (url && session_type != SESSION_SNAPSHOT) {
 439                 MSG("Traces will be written in %s", url);
 440
 441                 if (live_timer) {
 442                         MSG("Live timer set to %u usec", live_timer);
 443                 }
 444         } else if (session_type == SESSION_SNAPSHOT) {
 445                 if (url) {
 446                         MSG("Default snapshot output set to: %s", url);
 447                 }
 448                 MSG("Snapshot mode set. Every channel enabled for that session will "
 449                                 "be set to mmap output, and default to overwrite mode.");
 450         }
 451
 452         if (shm_path) {
 453                 MSG("Session %s set to shm_path: %s.", session_name,
 454                                 shm_path);
 455         }
 456
 457         /* Mi output */
 458         if (lttng_opt_mi) {
 459                 ret = mi_created_session(session_name);
 460                 if (ret) {
 461                         ret = CMD_ERROR;
 462                         goto error;
 463                 }
 464         }
 465 error:
 466         return ret;
 467 }
 468
 469 static int parse_template (struct config_document *template,
 470                 char **session_name,
 471                 enum session_type *session_type,
 472                 int *live_timer,
 473                 enum output_type *output_type,
 474                 char **url,
 475                 char **ctrl_url,
 476                 char **data_url,
 477                 char **shm_path)
 478 {
 479         int ret = 0;
 480         int printed_bytes;
 481         char *raw_value = NULL;
 482
 483         assert(template);
 484
 485         /* Session name */
 486         *session_name = config_document_get_element_value(template,"/sessions/session/name");
 487
 488         /* Check the type of session we have in the template */
 489         if(config_document_element_exist(template, "/sessions/session/attributes/snapshot_mode")) {
 490                 *session_type = SESSION_SNAPSHOT;
 491         } else if (config_document_element_exist(template, "/sessions/session/attributes/live_timer_interval")) {
 492                 *session_type = SESSION_LIVE;
 493                 raw_value = config_document_get_element_value(template,"/sessions/session/attributes/live_timer_interval");
 494                 *live_timer = config_parse_value(raw_value);
 495                 free(raw_value);
 496                 raw_value = NULL;
 497         } else {
 498                 *session_type = SESSION_NORMAL;
 499         }
 500
 501         /* Output */
 502         switch (*session_type) {
 503         case SESSION_NORMAL:
 504         case SESSION_LIVE:
 505                 if (!config_document_element_exist(template, "/sessions/session/output/consumer_output/destination")){
 506                         break;
 507                 }
 508                 if (config_document_element_exist(template, "/sessions/session/output/consumer_output/destination/path")){
 509                         raw_value = config_document_get_element_value(template, "/sessions/session/output/consumer_output/destination/path");
 510                         if (!raw_value) {
 511                                 ret = -1;
 512                                 goto error;
 513                         }
 514
 515                         if (strlen(raw_value) > 0) {
 516                                 *output_type = OUTPUT_LOCAL;
 517                                 printed_bytes = asprintf(url, "file://%s", raw_value);
 518                                 if (printed_bytes < 0) {
 519                                         ret = -1;
 520                                         goto error;
 521                                 }
 522                         } else {
 523                                 *output_type = OUTPUT_NONE;
 524                         }
 525
 526                         free(raw_value);
 527                         raw_value = NULL;
 528                         break;
 529                 } else if(config_document_element_exist(template, "/sessions/session/output/consumer_output/destination/net_output")) {
 530                         *ctrl_url = config_document_get_element_value(template, "/sessions/session/output/consumer_output/destination/net_output/control_uri");
 531                         *data_url = config_document_get_element_value(template, "/sessions/session/output/consumer_output/destination/net_output/data_uri");
 532                         if (!*ctrl_url || ! *data_url) {
 533                                 ret = -1;
 534                                 goto error;
 535                         }
 536                         *output_type = OUTPUT_NET;
 537                 } else {
 538                         /* There is no output definition */
 539                 }
 540                 break;
 541         case SESSION_SNAPSHOT:
 542                 if (!config_document_element_exist(template, "/sessions/session/output/snapshot_outputs/output/consumer_output/destination")){
 543                         break;
 544                 }
 545                 if (config_document_element_exist(template, "/sessions/session/output/snapshot_outputs/output/consumer_output/destination/path")){
 546                         raw_value = config_document_get_element_value(template, "/sessions/session/output/snapshot_outputs/output/consumer_output/destination/path");
 547                         if (!raw_value) {
 548                                 ret = -1;
 549                                 goto error;
 550                         }
 551
 552                         if (strlen(raw_value) > 0) {
 553                                 *output_type = OUTPUT_LOCAL;
 554                                 printed_bytes = asprintf(url, "file://%s", raw_value);
 555                                 if (printed_bytes < 0) {
 556                                         ret = -1;
 557                                         goto error;
 558                                 }
 559                         } else {
 560                                 *output_type = OUTPUT_NONE;
 561                         }
 562
 563                         free(raw_value);
 564                         raw_value = NULL;
 565                         break;
 566                 } else if(config_document_element_exist(template, "/sessions/session/output/snapshot_outputs/output/consumer_output/destination/net_output")) {
 567                         *ctrl_url = config_document_get_element_value(template, "/sessions/session/output/snapshot_outputs/output/consumer_output/destination/net_output/control_uri");
 568                         *data_url = config_document_get_element_value(template, "/sessions/session/output/snapshot_outputs/output/consumer_output/destination/net_output/data_uri");
 569                         if (!*ctrl_url || ! *data_url) {
 570                                 ret = -1;
 571                                 goto error;
 572                         }
 573                         *output_type = OUTPUT_NET;
 574                 } else {
 575                         /* There is no output definition */
 576                 }
 577                 break;
 578         case SESSION_UNKNOWN:
 579                 ret = -1;
 580                 goto error;
 581         }
 582
 583
 584         /* shared memory path */
 585         *shm_path = config_document_get_element_value(template,"/sessions/session/shared_memory_path");
 586
 587 error:
 588         free(raw_value);
 589         return ret;
 590
 591 }
 592 static int create_session_from_template(struct config_document *template,
 593                 const char *session_name,
 594                 enum session_type session_type,
 595                 int live_timer,
 596                 enum output_type output_type,
 597                 const char *url,
 598                 const char *ctrl_url,
 599                 const char *data_url,
 600                 const char *shm_path,
 601                 const char *datetime)
 602 {
 603         int ret = CMD_SUCCESS;
 604         int printed_bytes;
 605         struct config_element *temp_element = NULL;
 606         struct config_element *temp_element_child = NULL;
 607         char tmp_ctrl_uri[PATH_MAX];
 608         char tmp_data_uri[PATH_MAX];
 609         struct lttng_uri *uris = NULL;
 610         ssize_t uri_array_size = 0;
 611         char *tmp_string = NULL;
 612
 613         assert(template);
 614         assert(session_name);
 615
 616         memset(tmp_ctrl_uri, 0, sizeof(tmp_ctrl_uri));
 617         memset(tmp_data_uri, 0, sizeof(tmp_data_uri));
 618
 619         /* Session name */
 620         if (config_document_element_exist(template, "/sessions/session/name")) {
 621                 /* Replace the node value */
 622                 config_document_replace_element_value(template, "/sessions/session/name", session_name);
 623         } else {
 624                 /* insert the node */
 625                 temp_element = config_element_create("name", session_name);
 626                 if (!temp_element) {
 627                         ERR("Could not create session name node configuration");
 628                         ret = CMD_ERROR;
 629                         goto error;
 630                 }
 631                 ret = config_document_insert_element(template, "/sessions/session", temp_element);
 632                 if (ret) {
 633                         ERR("Could not insert session name node configuration");
 634                         ret = CMD_ERROR;
 635                         goto error;
 636                 }
 637                 config_element_free(temp_element);
 638         }
 639
 640         /*
 641          * Live timer
 642          */
 643         if (session_type == SESSION_LIVE) {
 644                 if (config_document_element_exist(template, "/sessions/session/attributes/live_timer_interval")) {
 645                         printed_bytes = asprintf(&tmp_string, "%d", live_timer);
 646                         if (printed_bytes < 0) {
 647                                 ERR("Asprintf failed for live timer");
 648                                 ret = CMD_ERROR;
 649                                 goto error;
 650                         }
 651                         ret = config_document_replace_element_value(template, "/sessions/session/attributes/live_timer_interval", tmp_string);
 652
 653                         if (ret) {
 654                                 printf("error: %d\n", ret);
 655                                 ERR("Replacement of live_timer_interval failed");
 656                                 ret = CMD_ERROR;
 657                                 goto error;
 658                         }
 659
 660                         free(tmp_string);
 661                         tmp_string = NULL;
 662                 } else {
 663                         ERR("Invalid live timer template. Missing live timer node");
 664                         ret = CMD_ERROR;
 665                         goto error;
 666                 }
 667
 668         }
 669
 670         /*
 671          * Generate the output node
 672          */
 673
 674         /* Get output from urls */
 675         if (url) {
 676                 /* Get lttng uris from single url */
 677                 uri_array_size = uri_parse_str_urls(url, NULL, &uris);
 678                 if (uri_array_size < 0) {
 679                         ret = CMD_ERROR;
 680                         goto error;
 681                 }
 682         } else if (ctrl_url && data_url) {
 683                 uri_array_size = uri_parse_str_urls(ctrl_url, data_url, &uris);
 684                 if (uri_array_size < 0) {
 685                         ret = CMD_ERROR;
 686                         goto error;
 687                 }
 688         } else {
 689                 /* --no-output */
 690                 uri_array_size = 0;
 691         }
 692
 693         /* Validate if the session output type still match the passed data */
 694         if ( (uri_array_size == 0 && output_type != OUTPUT_NONE) ||
 695                         (uri_array_size == 1 && output_type != OUTPUT_LOCAL) ||
 696                         (uri_array_size == 2 && output_type != OUTPUT_NET)) {
 697                 ERR("Overwriting value for output do not match the base output type");
 698                 ret = CMD_ERROR;
 699                 goto error;
 700         }
 701
 702         switch (output_type) {
 703         case OUTPUT_NONE:
 704                 temp_element_child = config_element_create("path", "");
 705                 if (!temp_element_child) {
 706                         ERR("Could not create empty path node configuration");
 707                         ret = CMD_ERROR;
 708                         goto error;
 709                 }
 710                 break;
 711         case OUTPUT_LOCAL:
 712                 temp_element_child = config_element_create("path", uris[0].dst.path);
 713                 if (!temp_element_child) {
 714                         ERR("Could not create local path node configuration");
 715                         ret = CMD_ERROR;
 716                         goto error;
 717                 }
 718                 break;
 719         case OUTPUT_NET:
 720                 uri_to_str_url(&uris[0], tmp_ctrl_uri, sizeof(tmp_ctrl_uri));
 721                 uri_to_str_url(&uris[1], tmp_data_uri, sizeof(tmp_data_uri));
 722
 723                 temp_element_child = config_element_create("net_output", NULL);
 724                 if (!temp_element_child) {
 725                         ERR("Could not create net_output node configuration");
 726                         ret = CMD_ERROR;
 727                         goto error;
 728                 }
 729
 730                 temp_element = config_element_create("control_uri", tmp_ctrl_uri);
 731                 if (!temp_element_child) {
 732                         ERR("Could not create ctrl uri node configuration");
 733                         ret = CMD_ERROR;
 734                         goto error;
 735                 }
 736
 737                 ret = config_element_add_child(temp_element_child, temp_element);
 738                 if (ret) {
 739                         ERR("Could not append control uri to the net_output node configuration");
 740                         ret = CMD_ERROR;
 741                         goto error;
 742                 }
 743
 744                 config_element_free(temp_element);
 745                 temp_element = NULL;
 746
 747                 temp_element = config_element_create("data_uri", tmp_data_uri);
 748
 749                 if (!temp_element_child) {
 750                         ERR("Could not create data_uri configuration");
 751                         ret = CMD_ERROR;
 752                         goto error;
 753                 }
 754
 755                 ret = config_element_add_child(temp_element_child, temp_element);
 756                 if (ret) {
 757                         ERR("Could not append data uri to the net_output node configuration");
 758                         ret = CMD_ERROR;
 759                         goto error;
 760                 }
 761                 config_element_free(temp_element);
 762                 temp_element = NULL;
 763                 break;
 764         default:
 765                 ret = CMD_ERROR;
 766                 goto error;
 767         }
 768
 769         temp_element = config_element_create("destination", NULL);
 770         if (!temp_element) {
 771                 ERR("Could not create destination node configuration");
 772                 ret = CMD_ERROR;
 773                 goto error;
 774         }
 775
 776         ret = config_element_add_child(temp_element, temp_element_child);
 777         if (ret) {
 778                 ERR("Could not append output data to the destination node configuration");
 779                 ret = CMD_ERROR;
 780                 goto error;
 781         }
 782
 783         config_element_free(temp_element_child);
 784         temp_element_child = NULL;
 785
 786         /* Construct the output/consumer_output/ node*/
 787         temp_element_child = temp_element;
 788         temp_element = config_element_create("consumer_output", NULL);
 789         if (!temp_element) {
 790                 ERR("Could not create consumer_output node configuration");
 791                 ret = CMD_ERROR;
 792                 goto error;
 793         }
 794
 795         ret = config_element_add_child(temp_element, temp_element_child);
 796         if (ret) {
 797                 ERR("Could not append output data to the consumer_output node configuration");
 798                 ret = CMD_ERROR;
 799                 goto error;
 800         }
 801
 802         config_element_free(temp_element_child);
 803         temp_element_child = config_element_create("enabled", "true");
 804         if (!temp_element_child) {
 805                 ERR("Could not create enbaled node configuration");
 806                 ret = CMD_ERROR;
 807                 goto error;
 808         }
 809
 810         ret = config_element_add_child(temp_element, temp_element_child);
 811         if (ret) {
 812                 ERR("Could not append node to the consumer_output node configuration");
 813                 ret = CMD_ERROR;
 814                 goto error;
 815         }
 816
 817         config_element_free(temp_element_child);
 818         temp_element_child = NULL;
 819
 820
 821         temp_element_child = temp_element;
 822         temp_element = config_element_create("output", NULL);
 823         if (!temp_element) {
 824                 ERR("Could not create output node configuration");
 825                 ret = CMD_ERROR;
 826                 goto error;
 827         }
 828
 829         ret = config_element_add_child(temp_element, temp_element_child);
 830         if (ret) {
 831                 ERR("Could not append output data to the output node configuration");
 832                 ret = CMD_ERROR;
 833                 goto error;
 834         }
 835
 836         config_element_free(temp_element_child);
 837         temp_element_child = NULL;
 838
 839
 840         /*
 841          * validate and replace the destination node for each session type
 842          * TODO: export string as const and simply assign a base path for the
 843          * destination node based on the session type
 844          **/
 845         switch (session_type) {
 846         case SESSION_NORMAL:
 847         case SESSION_LIVE:
 848                 break;
 849         case SESSION_SNAPSHOT:
 850                 /* construct the output/snapshots_outputs/ */
 851                 temp_element_child = temp_element;
 852                 temp_element = config_element_create("snapshot_outputs", NULL);
 853                 if (!temp_element) {
 854                         ERR("Could not create snapshot_outputs node configuration");
 855                         ret = CMD_ERROR;
 856                         goto error;
 857                 }
 858
 859                 ret = config_element_add_child(temp_element, temp_element_child);
 860                 if (ret) {
 861                         ERR("Could not append output data to the snapshot_outputs node configuration");
 862                         ret = CMD_ERROR;
 863                         goto error;
 864                 }
 865
 866                 config_element_free(temp_element_child);
 867                 temp_element_child = NULL;
 868
 869                 temp_element_child = temp_element;
 870                 temp_element = config_element_create("output", NULL);
 871                 if (!temp_element) {
 872                         ERR("Could not create output node configuration");
 873                         ret = CMD_ERROR;
 874                         goto error;
 875                 }
 876
 877                 ret = config_element_add_child(temp_element, temp_element_child);
 878                 if (ret) {
 879                         ERR("Could not append output data to the output node configuration");
 880                         ret = CMD_ERROR;
 881                         goto error;
 882                 }
 883
 884                 config_element_free(temp_element_child);
 885                 temp_element_child = NULL;
 886                 break;
 887         default:
 888                 ERR("Invalid session type");
 889                 ret = CMD_UNDEFINED;
 890                 goto error;
 891         }
 892
 893         if (!config_document_element_exist(template, "/sessions/session/output")) {
 894                 ret = config_document_insert_element(template, "/sessions/session", temp_element);
 895         } else {
 896                 ret = config_document_replace_element(template, "/sessions/session/output", temp_element);
 897         }
 898
 899         config_element_free(temp_element);
 900         temp_element = NULL;
 901
 902         if (ret) {
 903                 ERR("%s", lttng_strerror(ret));
 904                 ret = CMD_ERROR;
 905                 goto error;
 906         }
 907
 908
 909         /* Shm path */
 910         if (shm_path && config_document_element_exist(template, "/sessions/session/shared_memory_path")) {
 911                 /* Replace the node value */
 912                 config_document_replace_element_value(template, "/sessions/session/shared_memory_path", shm_path);
 913         } else if (shm_path) {
 914                 /* insert the node */
 915                 temp_element = config_element_create("shared_memory_path", shm_path);
 916                 if (!temp_element) {
 917                         ERR("Could not create shared_memory_path node configuration");
 918                         ret = CMD_ERROR;
 919                         goto error;
 920                 }
 921                 ret = config_document_insert_element(template, "/sessions/session", temp_element);
 922                 if (ret) {
 923                         ERR("Could not insert shared_memory_path node configuration");
 924                         ret = CMD_ERROR;
 925                         goto error;
 926                 }
 927
 928                 config_element_free(temp_element);
 929                 temp_element = NULL;
 930         }
 931
 932         ret = config_load_configuration_sessions(template, session_name, 0);
 933
 934
 935 error:
 936         config_element_free(temp_element);
 937         config_element_free(temp_element_child);
 938         free(tmp_string);
 939         free(uris);
 940         return ret;
 941
 942 }
 943
 944 /*
 945  *  Create a tracing session.
 946  *  If no name is specified, a default name is generated.
 947  *
 948  *  Returns one of the CMD_* result constants.
 949  */
 950 static int create_session(void)
 951 {
 952         int ret;
 953         int printed_bytes;
 954
 955
 956         /* Template */
 957         struct config_document *template = NULL;
 958
 959         /* Base data */
 960         enum session_type base_session_type = SESSION_UNKNOWN;
 961         enum output_type base_output_type = OUTPUT_UNKNOWN;
 962         char *base_session_name = NULL;
 963         char *base_url = NULL;
 964         char *base_ctrl_url = NULL;
 965         char *base_data_url = NULL;
 966         char *base_shm_path = NULL;
 967         int base_live_timer = 0;
 968
 969         /* Time data */
 970         char datetime[16];
 971         time_t rawtime;
 972         struct tm *timeinfo = NULL;
 973
 974         /* Temporary variables */
 975         char *traces_path = NULL;
 976         char *temp_url = NULL;
 977         char *session_name_date = NULL;
 978         char *tmp_url = NULL;
 979         char *tmp_home_path = NULL;
 980         struct lttng_uri *uris = NULL;
 981         ssize_t uri_array_size = 0;
 982
 983
 984         /* Get date and time for automatic session name/path */
 985         time(&rawtime);
 986         timeinfo = localtime(&rawtime);
 987         strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
 988
 989         if (opt_template_path) {
 990                 /* Restriction on flags exist when using template */
 991                 /* Session type flags are not permitted */
 992                 /* --live & --snapshot */
 993                 template = config_document_get(opt_template_path);
 994                 if (!template) {
 995                         ERR("Template could not be parsed");
 996                         ret = CMD_ERROR;
 997                         goto error;
 998                 }
 999                 /* Load info from template if any */
1000                 /* TODO: might want to use a struct in the end for the session... */
1001                 ret = parse_template(template, &base_session_name,
1002                                 &base_session_type,
1003                                 &base_live_timer,
1004                                 &base_output_type,
1005                                 &base_url,
1006                                 &base_ctrl_url,
1007                                 &base_data_url,
1008                                 &base_shm_path);
1009                 if (ret) {
1010                         goto error;
1011                 }
1012         }
1013
1014         /* Option validation */
1015         if (validate_command_options(base_session_type) != CMD_SUCCESS) {
1016                 ret = CMD_ERROR;
1017                 goto error;
1018         }
1019
1020         /* Find the session type based on options */
1021         if(base_session_type == SESSION_UNKNOWN) {
1022                 if (opt_snapshot) {
1023                         base_session_type = SESSION_SNAPSHOT;
1024                 } else if (opt_live_timer) {
1025                         base_session_type = SESSION_LIVE;
1026                 } else {
1027                         base_session_type = SESSION_NORMAL;
1028                 }
1029         }
1030
1031         /*
1032          * Session name handling
1033          */
1034         if (opt_session_name) {
1035                 /* Override the session name */
1036                 if (strlen(opt_session_name) > NAME_MAX) {
1037                         ERR("Session name too long. Length must be lower or equal to %d",
1038                                         NAME_MAX);
1039                         ret = LTTNG_ERR_SESSION_FAIL;
1040                         free(session_name_date);
1041                         goto error;
1042                 }
1043                 /*
1044                  * Check if the session name begins with "auto-" or is exactly "auto".
1045                  * Both are reserved for the default session name. See bug #449 to
1046                  * understand why we need to check both here.
1047                  */
1048                 if ((strncmp(opt_session_name, DEFAULT_SESSION_NAME "-",
1049                                 strlen(DEFAULT_SESSION_NAME) + 1) == 0) ||
1050                         (strncmp(opt_session_name, DEFAULT_SESSION_NAME,
1051                                 strlen(DEFAULT_SESSION_NAME)) == 0 &&
1052                         strlen(opt_session_name) == strlen(DEFAULT_SESSION_NAME))) {
1053                         ERR("%s is a reserved keyword for default session(s)",
1054                                         DEFAULT_SESSION_NAME);
1055
1056                         ret = CMD_ERROR;
1057                         goto error;
1058                 }
1059
1060                 base_session_name = strndup(opt_session_name, NAME_MAX);
1061                 if (!base_session_name) {
1062                         PERROR("Strdup session name");
1063                         ret = CMD_ERROR;
1064                         goto error;
1065                 }
1066
1067                 printed_bytes = asprintf(&session_name_date, "%s-%s", base_session_name, datetime);
1068                 if (printed_bytes < 0) {
1069                         PERROR("Asprintf session name");
1070                         ret = CMD_ERROR;
1071                         goto error;
1072                 }
1073                 DBG("Session name from command option set to %s", base_session_name);
1074         } else if (base_session_name && !opt_default_name) {
1075                 printed_bytes = asprintf(&session_name_date, "%s-%s", base_session_name, datetime);
1076                 if (printed_bytes < 0) {
1077                         PERROR("Asprintf session name");
1078                         ret = CMD_ERROR;
1079                         goto error;
1080                 }
1081         } else {
1082                 /* Generate a name */
1083                 printed_bytes = asprintf(&base_session_name, DEFAULT_SESSION_NAME "-%s", datetime);
1084                 if (printed_bytes < 0) {
1085                         PERROR("Asprintf session name");
1086                         ret = CMD_ERROR;
1087                         goto error;
1088                 }
1089                 session_name_date = strdup(base_session_name);
1090                 DBG("Auto session name set to %s", base_session_name);
1091         }
1092
1093
1094         /*
1095          * Output handling
1096          */
1097
1098         /*
1099          * If any of those options are present clear all output related data.
1100          */
1101         if (opt_output_path || opt_url || (opt_ctrl_url && opt_data_url) || opt_no_output) {
1102                 /* Overwrite output */
1103                 free(base_url);
1104                 free(base_ctrl_url);
1105                 free(base_data_url);
1106                 base_url = NULL;
1107                 base_ctrl_url = NULL;
1108                 base_data_url = NULL;
1109         }
1110
1111         if (opt_output_path) {
1112
1113                 traces_path = utils_expand_path(opt_output_path);
1114                 if (!traces_path) {
1115                         ret = CMD_ERROR;
1116                         goto error;
1117                 }
1118
1119                 /* Create URL string from the local file system path */
1120                 printed_bytes = asprintf(&temp_url, "file://%s", traces_path);
1121                 if (printed_bytes < 0) {
1122                         PERROR("asprintf url path");
1123                         ret = CMD_FATAL;
1124                         goto error;
1125                 }
1126
1127                 base_url = temp_url;
1128         } else if (opt_url) { /* Handling URL (-U opt) */
1129                 base_url = strdup(opt_url);
1130         } else if (opt_data_url && opt_ctrl_url) {
1131                 /*
1132                  * With both control and data, we'll be setting the consumer URL
1133                  * after session creation thus use no URL.
1134                  */
1135                 base_ctrl_url = strdup(opt_ctrl_url);
1136                 base_data_url = strdup(opt_data_url);
1137         } else if (opt_default_output || !(opt_no_output ||
1138                         base_output_type == OUTPUT_NONE || base_url ||
1139                         base_ctrl_url || base_data_url)) {
1140                 /* Generate default output depending on the session type */
1141                 switch (base_session_type) {
1142                 case SESSION_NORMAL:
1143                         /* fallthrough */
1144                 case SESSION_SNAPSHOT:
1145                         /* Default to a local path */
1146                         tmp_home_path = utils_get_home_dir();
1147                         if (tmp_home_path == NULL) {
1148                                 ERR("HOME path not found.\n \
1149                                                 Please specify an output path using -o, --output PATH");
1150                                 ret = CMD_FATAL;
1151                                 goto error;
1152                         }
1153
1154                         printed_bytes = asprintf(&tmp_url,
1155                                         "file://%s/" DEFAULT_TRACE_DIR_NAME "/%s",
1156                                         tmp_home_path, session_name_date);
1157
1158                         if (printed_bytes < 0) {
1159                                 PERROR("asprintf trace dir name");
1160                                 ret = CMD_FATAL;
1161                                 goto error;
1162                         }
1163
1164                         base_url = tmp_url ;
1165                         break;
1166                 case SESSION_LIVE:
1167                         /* Default to a net output */
1168                         printed_bytes = asprintf(&tmp_url, "net://127.0.0.1");
1169                         if (printed_bytes < 0) {
1170                                 PERROR("asprintf default live URL");
1171                                 ret = CMD_FATAL;
1172                                 goto error;
1173                         }
1174                         base_url = tmp_url ;
1175                         break;
1176                 default:
1177                         ERR("Unknown session type");
1178                         ret = CMD_FATAL;
1179                         goto error;
1180                 }
1181         }
1182
1183          /*
1184           * Shared memory path handling
1185           */
1186         if (opt_shm_path) {
1187                 /* Overwrite shm_path so clear any previously defined one */
1188                 free(base_shm_path);
1189                 printed_bytes = asprintf(&base_shm_path, "%s/%s", opt_shm_path, session_name_date);
1190                 if (printed_bytes < 0) {
1191                         PERROR("asprintf shm_path");
1192                         ret = CMD_FATAL;
1193                         goto error;
1194                 }
1195         }
1196
1197          /*
1198           * Live timer handling
1199           */
1200         if (opt_live_timer) {
1201                 base_live_timer = opt_live_timer;
1202         }
1203
1204         /* Get output type from urls */
1205         /* TODO: Find a better way of inferring output type */
1206         if (base_url) {
1207                 /* Get lttng uris from single url */
1208                 uri_array_size = uri_parse_str_urls(base_url, NULL, &uris);
1209                 if (uri_array_size < 0) {
1210                         ret = CMD_ERROR;
1211                         goto error;
1212                 }
1213         } else if (base_ctrl_url && base_data_url) {
1214                 uri_array_size = uri_parse_str_urls(base_ctrl_url, base_data_url, &uris);
1215                 if (uri_array_size < 0) {
1216                         ret = CMD_ERROR;
1217                         goto error;
1218                 }
1219         } else {
1220                 /* --no-output */
1221                 uri_array_size = 0;
1222         }
1223
1224         switch (uri_array_size) {
1225         case 0:
1226                 base_output_type = OUTPUT_NONE;
1227                 break;
1228         case 1:
1229                 base_output_type = OUTPUT_LOCAL;
1230                 break;
1231         case 2:
1232                 base_output_type = OUTPUT_NET;
1233                 break;
1234         default:
1235                 ret = CMD_ERROR;
1236                 goto error;
1237         }
1238
1239         if (template) {
1240                 ret = create_session_from_template(template,
1241                                 base_session_name,
1242                                 base_session_type,
1243                                 base_live_timer,
1244                                 base_output_type,
1245                                 base_url,
1246                                 base_ctrl_url,
1247                                 base_data_url,
1248                                 base_shm_path,
1249                                 datetime);
1250         } else {
1251                 ret = create_session_basic(base_session_name,
1252                                 base_session_type,
1253                                 base_live_timer,
1254                                 base_output_type,
1255                                 base_url,
1256                                 base_ctrl_url,
1257                                 base_data_url,
1258                                 base_shm_path,
1259                                 datetime);
1260         }
1261         if (ret) {
1262                 goto error;
1263         }
1264
1265         ret = generate_output(base_session_name,
1266                         base_session_type,
1267                         base_live_timer,
1268                         base_output_type,
1269                         base_url,
1270                         base_ctrl_url,
1271                         base_data_url,
1272                         base_shm_path);
1273         if (ret) {
1274                 goto error;
1275         }
1276
1277         /* Init lttng session config */
1278         ret = config_init(base_session_name);
1279         if (ret < 0) {
1280                 ret = CMD_ERROR;
1281                 goto error;
1282         }
1283
1284         ret = CMD_SUCCESS;
1285
1286 error:
1287         /* Session temp stuff */
1288         config_document_free(template);
1289         free(session_name_date);
1290         free(uris);
1291         free(traces_path);
1292
1293         if (ret < 0) {
1294                 ERR("%s", lttng_strerror(ret));
1295         }
1296
1297         free(base_session_name);
1298         free(base_url);
1299         free(base_ctrl_url);
1300         free(base_data_url);
1301         free(base_shm_path);
1302         return ret;
1303 }
1304
1305 /*
1306  *  spawn_sessiond
1307  *
1308  *  Spawn a session daemon by forking and execv.
1309  */
1310 static int spawn_sessiond(char *pathname)
1311 {
1312         int ret = 0;
1313         pid_t pid;
1314
1315         MSG("Spawning a session daemon");
1316         pid = fork();
1317         if (pid == 0) {
1318                 /*
1319                  * Spawn session daemon in daemon mode.
1320                  */
1321                 execlp(pathname, "lttng-sessiond",
1322                                 "--daemonize", NULL);
1323                 /* execlp only returns if error happened */
1324                 if (errno == ENOENT) {
1325                         ERR("No session daemon found. Use --sessiond-path.");
1326                 } else {
1327                         PERROR("execlp");
1328                 }
1329                 kill(getppid(), SIGTERM);       /* wake parent */
1330                 exit(EXIT_FAILURE);
1331         } else if (pid > 0) {
1332                 /*
1333                  * In daemon mode (--daemonize), sessiond only exits when
1334                  * it's ready to accept commands.
1335                  */
1336                 for (;;) {
1337                         int status;
1338                         pid_t wait_pid_ret = waitpid(pid, &status, 0);
1339
1340                         if (wait_pid_ret < 0) {
1341                                 if (errno == EINTR) {
1342                                         continue;
1343                                 }
1344                                 PERROR("waitpid");
1345                                 ret = -errno;
1346                                 goto end;
1347                         }
1348
1349                         if (WIFSIGNALED(status)) {
1350                                 ERR("Session daemon was killed by signal %d",
1351                                                 WTERMSIG(status));
1352                                 ret = -1;
1353                                 goto end;
1354                         } else if (WIFEXITED(status)) {
1355                                 DBG("Session daemon terminated normally (exit status: %d)",
1356                                                 WEXITSTATUS(status));
1357
1358                                 if (WEXITSTATUS(status) != 0) {
1359                                         ERR("Session daemon terminated with an error (exit status: %d)",
1360                                                         WEXITSTATUS(status));
1361                                         ret = -1;
1362                                         goto end;
1363                                 }
1364                                 break;
1365                         }
1366                 }
1367
1368                 goto end;
1369         } else {
1370                 PERROR("fork");
1371                 ret = -1;
1372                 goto end;
1373         }
1374
1375 end:
1376         return ret;
1377 }
1378
1379 /*
1380  *  launch_sessiond
1381  *
1382  *  Check if the session daemon is available using
1383  *  the liblttngctl API for the check. If not, try to
1384  *  spawn a daemon.
1385  */
1386 static int launch_sessiond(void)
1387 {
1388         int ret;
1389         char *pathname = NULL;
1390
1391         ret = lttng_session_daemon_alive();
1392         if (ret) {
1393                 /* Sessiond is alive, not an error */
1394                 ret = 0;
1395                 goto end;
1396         }
1397
1398         /* Try command line option path */
1399         pathname = opt_sessiond_path;
1400
1401         /* Try LTTNG_SESSIOND_PATH env variable */
1402         if (pathname == NULL) {
1403                 pathname = getenv(DEFAULT_SESSIOND_PATH_ENV);
1404         }
1405
1406         /* Try with configured path */
1407         if (pathname == NULL) {
1408                 if (CONFIG_SESSIOND_BIN[0] != '\0') {
1409                         pathname = CONFIG_SESSIOND_BIN;
1410                 }
1411         }
1412
1413         /* Try the default path */
1414         if (pathname == NULL) {
1415                 pathname = INSTALL_BIN_PATH "/lttng-sessiond";
1416         }
1417
1418         DBG("Session daemon binary path: %s", pathname);
1419
1420         /* Check existence and permissions */
1421         ret = access(pathname, F_OK | X_OK);
1422         if (ret < 0) {
1423                 ERR("No such file or access denied: %s", pathname);
1424                 goto end;
1425         }
1426
1427         ret = spawn_sessiond(pathname);
1428 end:
1429         if (ret) {
1430                 ERR("Problem occurred while launching session daemon (%s)",
1431                                 pathname);
1432         }
1433         return ret;
1434 }
1435
1436 /*
1437  *  The 'create <options>' first level command
1438  *
1439  *  Returns one of the CMD_* result constants.
1440  */
1441 int cmd_create(int argc, const char **argv)
1442 {
1443         int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
1444         char *opt_arg = NULL;
1445         static poptContext pc;
1446
1447         pc = poptGetContext(NULL, argc, argv, long_options, 0);
1448         poptReadDefaultConfig(pc, 0);
1449
1450         while ((opt = poptGetNextOpt(pc)) != -1) {
1451                 switch (opt) {
1452                 case OPT_HELP:
1453                         SHOW_HELP();
1454                         goto end;
1455                 case OPT_LIST_OPTIONS:
1456                         list_cmd_options(stdout, long_options);
1457                         goto end;
1458                 case OPT_LIVE_TIMER:
1459                 {
1460                         unsigned long v;
1461
1462                         errno = 0;
1463                         opt_arg = poptGetOptArg(pc);
1464                         if (!opt_arg) {
1465                                 /* Set up default values. */
1466                                 opt_live_timer = (uint32_t) DEFAULT_LTTNG_LIVE_TIMER;
1467                                 DBG("Session live timer interval set to default value %d",
1468                                                 opt_live_timer);
1469                                 break;
1470                         }
1471
1472                         v = strtoul(opt_arg, NULL, 0);
1473                         if (errno != 0 || !isdigit(opt_arg[0])) {
1474                                 ERR("Wrong value in --live parameter: %s", opt_arg);
1475                                 ret = CMD_ERROR;
1476                                 goto end;
1477                         }
1478                         if (v != (uint32_t) v) {
1479                                 ERR("32-bit overflow in --live parameter: %s", opt_arg);
1480                                 ret = CMD_ERROR;
1481                                 goto end;
1482                         }
1483                         if (v == 0) {
1484                                 ERR("Live timer interval must be greater than zero");
1485                                 ret = CMD_ERROR;
1486                                 goto end;
1487                         }
1488                         opt_live_timer = (uint32_t) v;
1489                         DBG("Session live timer interval set to %d", opt_live_timer);
1490                         break;
1491                 }
1492                 case OPT_DEFAULT_NAME:
1493                         opt_default_name = true;
1494                         break;
1495                 case OPT_DEFAULT_OUTPUT:
1496                         opt_default_output = true;
1497                         break;
1498                 default:
1499                         ret = CMD_UNDEFINED;
1500                         goto end;
1501                 }
1502         }
1503
1504         if (opt_no_consumer) {
1505                 MSG("The option --no-consumer is obsolete. Use --no-output now.");
1506                 ret = CMD_WARNING;
1507                 goto end;
1508         }
1509
1510         /* Spawn a session daemon if needed */
1511         if (!opt_no_sessiond) {
1512                 ret = launch_sessiond();
1513                 if (ret) {
1514                         ret = CMD_ERROR;
1515                         goto end;
1516                 }
1517         }
1518
1519         /* MI initialization */
1520         if (lttng_opt_mi) {
1521                 writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
1522                 if (!writer) {
1523                         ret = -LTTNG_ERR_NOMEM;
1524                         goto end;
1525                 }
1526
1527                 /* Open command element */
1528                 ret = mi_lttng_writer_command_open(writer,
1529                                 mi_lttng_element_command_create);
1530                 if (ret) {
1531                         ret = CMD_ERROR;
1532                         goto end;
1533                 }
1534
1535                 /* Open output element */
1536                 ret = mi_lttng_writer_open_element(writer,
1537                                 mi_lttng_element_command_output);
1538                 if (ret) {
1539                         ret = CMD_ERROR;
1540                         goto end;
1541                 }
1542         }
1543         opt_session_name = (char*) poptGetArg(pc);
1544
1545         command_ret = create_session();
1546
1547         if (command_ret) {
1548                 success = 0;
1549         }
1550
1551         if (lttng_opt_mi) {
1552                 /* Close  output element */
1553                 ret = mi_lttng_writer_close_element(writer);
1554                 if (ret) {
1555                         ret = CMD_ERROR;
1556                         goto end;
1557                 }
1558
1559                 /* Success ? */
1560                 ret = mi_lttng_writer_write_element_bool(writer,
1561                                 mi_lttng_element_command_success, success);
1562                 if (ret) {
1563                         ret = CMD_ERROR;
1564                         goto end;
1565                 }
1566
1567                 /* Command element close */
1568                 ret = mi_lttng_writer_command_close(writer);
1569                 if (ret) {
1570                         ret = CMD_ERROR;
1571                         goto end;
1572                 }
1573         }
1574
1575 end:
1576         /* Mi clean-up */
1577         if (writer && mi_lttng_writer_destroy(writer)) {
1578                 /* Preserve original error code */
1579                 ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
1580         }
1581
1582         /* Overwrite ret if an error occurred in create_session() */
1583         ret = command_ret ? command_ret : ret;
1584
1585         poptFreeContext(pc);
1586         return ret;
1587 }