src/common/mi-lttng.c

   1 /*
   2  * Copyright (C) 2014 - Jonathan Rajotte <jonathan.r.julien@gmail.com>
   3  *                    - Olivier Cotte <olivier.cotte@polymtl.ca>
   4  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License, version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 51
  16  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19
  20 #include <include/config.h>
  21 #include <common/config/config.h>
  22 #include <lttng/snapshot-internal.h>
  23 #include "mi-lttng.h"
  24
  25 #include <assert.h>
  26
  27 /* Strings related to command */
  28 const char * const mi_lttng_element_command = "command";
  29 const char * const mi_lttng_element_command_action = "snapshot_action";
  30 const char * const mi_lttng_element_command_add_context = "add-context";
  31 const char * const mi_lttng_element_command_calibrate = "calibrate";
  32 const char * const mi_lttng_element_command_create = "create";
  33 const char * const mi_lttng_element_command_destroy = "destroy";
  34 const char * const mi_lttng_element_command_disable_channel = "disable-channel";
  35 const char * const mi_lttng_element_command_disable_event = "disable-event";
  36 const char * const mi_lttng_element_command_enable_channels = "enable-channel";
  37 const char * const mi_lttng_element_command_enable_event = "enable-event";
  38 const char * const mi_lttng_element_command_list = "list";
  39 const char * const mi_lttng_element_command_load = "load";
  40 const char * const mi_lttng_element_command_name = "name";
  41 const char * const mi_lttng_element_command_output = "output";
  42 const char * const mi_lttng_element_command_save = "save";
  43 const char * const mi_lttng_element_command_set_session = "set-session";
  44 const char * const mi_lttng_element_command_snapshot = "snapshot";
  45 const char * const mi_lttng_element_command_snapshot_add = "add_snapshot";
  46 const char * const mi_lttng_element_command_snapshot_del = "del_snapshot";
  47 const char * const mi_lttng_element_command_snapshot_list = "list_snapshot";
  48 const char * const mi_lttng_element_command_snapshot_record = "record_snapshot";
  49 const char * const mi_lttng_element_command_start = "start";
  50 const char * const mi_lttng_element_command_stop = "stop";
  51 const char * const mi_lttng_element_command_success = "success";
  52 const char * const mi_lttng_element_command_version = "version";
  53
  54 /* Strings related to version command */
  55 const char * const mi_lttng_element_version = "version";
  56 const char * const mi_lttng_element_version_commit = "commit";
  57 const char * const mi_lttng_element_version_description = "description";
  58 const char * const mi_lttng_element_version_license = "license";
  59 const char * const mi_lttng_element_version_major = "major";
  60 const char * const mi_lttng_element_version_minor = "minor";
  61 const char * const mi_lttng_element_version_patch_level = "patchLevel";
  62 const char * const mi_lttng_element_version_str = "string";
  63 const char * const mi_lttng_element_version_web = "url";
  64
  65 /* String related to a lttng_event_field */
  66 const char * const mi_lttng_element_event_field = "event_field";
  67 const char * const mi_lttng_element_event_fields = "event_fields";
  68
  69 /* String related to lttng_event_context */
  70 const char * const mi_lttng_context_type_perf_counter = "PERF_COUNTER";
  71 const char * const mi_lttng_context_type_perf_cpu_counter = "PERF_CPU_COUNTER";
  72 const char * const mi_lttng_context_type_perf_thread_counter = "PERF_THREAD_COUNTER";
  73
  74 /* String related to lttng_event_perf_counter_ctx */
  75 const char * const mi_lttng_element_perf_counter_context = "perf_counter_context";
  76
  77 /* Strings related to pid */
  78 const char * const mi_lttng_element_pids = "pids";
  79 const char * const mi_lttng_element_pid = "pid";
  80 const char * const mi_lttng_element_pid_id = "id";
  81
  82 /* Strings related to save command */
  83 const char * const mi_lttng_element_save = "save";
  84
  85 /* Strings related to load command */
  86 const char * const mi_lttng_element_load = "load";
  87
  88 /* General elements of mi_lttng */
  89 const char * const mi_lttng_element_empty = "";
  90 const char * const mi_lttng_element_id = "id";
  91 const char * const mi_lttng_element_nowrite = "nowrite";
  92 const char * const mi_lttng_element_success = "success";
  93 const char * const mi_lttng_element_type_enum = "ENUM";
  94 const char * const mi_lttng_element_type_float = "FLOAT";
  95 const char * const mi_lttng_element_type_integer = "INTEGER";
  96 const char * const mi_lttng_element_type_other = "OTHER";
  97 const char * const mi_lttng_element_type_string = "STRING";
  98
  99 /* String related to loglevel */
 100 const char * const mi_lttng_loglevel_str_alert = "TRACE_ALERT";
 101 const char * const mi_lttng_loglevel_str_crit = "TRACE_CRIT";
 102 const char * const mi_lttng_loglevel_str_debug = "TRACE_DEBUG";
 103 const char * const mi_lttng_loglevel_str_debug_function = "TRACE_DEBUG_FUNCTION";
 104 const char * const mi_lttng_loglevel_str_debug_line = "TRACE_DEBUG_LINE";
 105 const char * const mi_lttng_loglevel_str_debug_module = "TRACE_DEBUG_MODULE";
 106 const char * const mi_lttng_loglevel_str_debug_process = "TRACE_DEBUG_PROCESS";
 107 const char * const mi_lttng_loglevel_str_debug_program = "TRACE_DEBUG_PROGRAM";
 108 const char * const mi_lttng_loglevel_str_debug_system = "TRACE_DEBUG_SYSTEM";
 109 const char * const mi_lttng_loglevel_str_debug_unit = "TRACE_DEBUG_UNIT";
 110 const char * const mi_lttng_loglevel_str_emerg = "TRACE_EMERG";
 111 const char * const mi_lttng_loglevel_str_err = "TRACE_ERR";
 112 const char * const mi_lttng_loglevel_str_info = "TRACE_INFO";
 113 const char * const mi_lttng_loglevel_str_notice = "TRACE_NOTICE";
 114 const char * const mi_lttng_loglevel_str_unknown = "UNKNOWN";
 115 const char * const mi_lttng_loglevel_str_warning = "TRACE_WARNING";
 116
 117 /* String related to loglevel JUL */
 118 const char * const mi_lttng_loglevel_str_jul_all = "JUL_ALL";
 119 const char * const mi_lttng_loglevel_str_jul_config = "JUL_CONFIG";
 120 const char * const mi_lttng_loglevel_str_jul_fine = "JUL_FINE";
 121 const char * const mi_lttng_loglevel_str_jul_finer = "JUL_FINER";
 122 const char * const mi_lttng_loglevel_str_jul_finest = "JUL_FINEST";
 123 const char * const mi_lttng_loglevel_str_jul_info = "JUL_INFO";
 124 const char * const mi_lttng_loglevel_str_jul_off = "JUL_OFF";
 125 const char * const mi_lttng_loglevel_str_jul_severe = "JUL_SEVERE";
 126 const char * const mi_lttng_loglevel_str_jul_warning = "JUL_WARNING";
 127
 128 /* String related to loglevel type */
 129 const char * const mi_lttng_loglevel_type_all = "ALL";
 130 const char * const mi_lttng_loglevel_type_range = "RANGE";
 131 const char * const mi_lttng_loglevel_type_single = "SINGLE";
 132 const char * const mi_lttng_loglevel_type_unknown = "UNKNOWN";
 133
 134 /* String related to lttng_calibrate */
 135 const char * const mi_lttng_element_calibrate = "calibrate";
 136 const char * const mi_lttng_element_calibrate_function = "FUNCTION";
 137
 138 /* String related to a lttng_snapshot_output */
 139 const char * const mi_lttng_element_snapshot_ctrl_url = "ctrl_url";
 140 const char * const mi_lttng_element_snapshot_data_url = "data_url";
 141 const char * const mi_lttng_element_snapshot_max_size = "max_size";
 142 const char * const mi_lttng_element_snapshot_n_ptr = "n_ptr";
 143 const char * const mi_lttng_element_snapshot_session_name = "session_name";
 144 const char * const mi_lttng_element_snapshots = "snapshots";
 145
 146 /* This is a merge of jul loglevel and regular loglevel
 147  * Those should never overlap by definition
 148  * (see struct lttng_event loglevel)
 149  */
 150 const char *mi_lttng_loglevel_string(int value)
 151 {
 152         switch (value) {
 153         case -1:
 154                 return mi_lttng_element_empty;
 155         case LTTNG_LOGLEVEL_EMERG:
 156                 return mi_lttng_loglevel_str_emerg;
 157         case LTTNG_LOGLEVEL_ALERT:
 158                 return mi_lttng_loglevel_str_alert;
 159         case LTTNG_LOGLEVEL_CRIT:
 160                 return mi_lttng_loglevel_str_crit;
 161         case LTTNG_LOGLEVEL_ERR:
 162                 return mi_lttng_loglevel_str_err;
 163         case LTTNG_LOGLEVEL_WARNING:
 164                 return mi_lttng_loglevel_str_warning;
 165         case LTTNG_LOGLEVEL_NOTICE:
 166                 return mi_lttng_loglevel_str_notice;
 167         case LTTNG_LOGLEVEL_INFO:
 168                 return mi_lttng_loglevel_str_info;
 169         case LTTNG_LOGLEVEL_DEBUG_SYSTEM:
 170                 return mi_lttng_loglevel_str_debug_system;
 171         case LTTNG_LOGLEVEL_DEBUG_PROGRAM:
 172                 return mi_lttng_loglevel_str_debug_program;
 173         case LTTNG_LOGLEVEL_DEBUG_PROCESS:
 174                 return mi_lttng_loglevel_str_debug_process;
 175         case LTTNG_LOGLEVEL_DEBUG_MODULE:
 176                 return mi_lttng_loglevel_str_debug_module;
 177         case LTTNG_LOGLEVEL_DEBUG_UNIT:
 178                 return mi_lttng_loglevel_str_debug_unit;
 179         case LTTNG_LOGLEVEL_DEBUG_FUNCTION:
 180                 return mi_lttng_loglevel_str_debug_function;
 181         case LTTNG_LOGLEVEL_DEBUG_LINE:
 182                 return mi_lttng_loglevel_str_debug_line;
 183         case LTTNG_LOGLEVEL_DEBUG:
 184                 return mi_lttng_loglevel_str_debug;
 185         case LTTNG_LOGLEVEL_JUL_OFF:
 186                 return mi_lttng_loglevel_str_jul_off;
 187         case LTTNG_LOGLEVEL_JUL_SEVERE:
 188                 return mi_lttng_loglevel_str_jul_severe;
 189         case LTTNG_LOGLEVEL_JUL_WARNING:
 190                 return mi_lttng_loglevel_str_jul_warning;
 191         case LTTNG_LOGLEVEL_JUL_INFO:
 192                 return mi_lttng_loglevel_str_jul_info;
 193         case LTTNG_LOGLEVEL_JUL_CONFIG:
 194                 return mi_lttng_loglevel_str_jul_config;
 195         case LTTNG_LOGLEVEL_JUL_FINE:
 196                 return mi_lttng_loglevel_str_jul_fine;
 197         case LTTNG_LOGLEVEL_JUL_FINER:
 198                 return mi_lttng_loglevel_str_jul_finer;
 199         case LTTNG_LOGLEVEL_JUL_FINEST:
 200                 return mi_lttng_loglevel_str_jul_finest;
 201         case LTTNG_LOGLEVEL_JUL_ALL:
 202                 return mi_lttng_loglevel_str_jul_all;
 203         default:
 204                 return mi_lttng_loglevel_str_unknown;
 205         }
 206 }
 207
 208 const char *mi_lttng_logleveltype_string(enum lttng_loglevel_type value)
 209 {
 210         switch (value) {
 211         case LTTNG_EVENT_LOGLEVEL_ALL:
 212                 return mi_lttng_loglevel_type_all;
 213         case LTTNG_EVENT_LOGLEVEL_RANGE:
 214                 return mi_lttng_loglevel_type_range;
 215         case LTTNG_EVENT_LOGLEVEL_SINGLE:
 216                 return mi_lttng_loglevel_type_single;
 217         default:
 218                 return mi_lttng_loglevel_type_unknown;
 219         }
 220 }
 221
 222 const char *mi_lttng_eventtype_string(enum lttng_event_type value)
 223 {
 224         switch (value) {
 225         case LTTNG_EVENT_ALL:
 226                 return config_event_type_all;
 227         case LTTNG_EVENT_TRACEPOINT:
 228                 return config_event_type_tracepoint;
 229         case LTTNG_EVENT_PROBE:
 230                 return config_event_type_probe;
 231         case LTTNG_EVENT_FUNCTION:
 232                 return config_event_type_function;
 233         case LTTNG_EVENT_FUNCTION_ENTRY:
 234                 return config_event_type_function_entry;
 235         case LTTNG_EVENT_SYSCALL:
 236                 return config_event_type_syscall;
 237         case LTTNG_EVENT_NOOP:
 238                 return config_event_type_noop;
 239         default:
 240                 return mi_lttng_element_empty;
 241         }
 242 }
 243
 244 const char *mi_lttng_event_contexttype_string(enum lttng_event_context_type val)
 245 {
 246         switch (val) {
 247         case LTTNG_EVENT_CONTEXT_PID:
 248                 return config_event_context_pid;
 249         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
 250                 return mi_lttng_context_type_perf_counter;
 251         case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
 252                 return mi_lttng_context_type_perf_thread_counter;
 253         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
 254                 return mi_lttng_context_type_perf_cpu_counter;
 255         case LTTNG_EVENT_CONTEXT_PROCNAME:
 256                 return config_event_context_procname;
 257         case LTTNG_EVENT_CONTEXT_PRIO:
 258                 return config_event_context_prio;
 259         case LTTNG_EVENT_CONTEXT_NICE:
 260                 return config_event_context_nice;
 261         case LTTNG_EVENT_CONTEXT_VPID:
 262                 return config_event_context_vpid;
 263         case LTTNG_EVENT_CONTEXT_TID:
 264                 return config_event_context_tid;
 265         case LTTNG_EVENT_CONTEXT_VTID:
 266                 return config_event_context_vtid;
 267         case LTTNG_EVENT_CONTEXT_PPID:
 268                 return config_event_context_ppid;
 269         case LTTNG_EVENT_CONTEXT_VPPID:
 270                 return config_event_context_vppid;
 271         case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
 272                 return config_event_context_pthread_id;
 273         case LTTNG_EVENT_CONTEXT_HOSTNAME:
 274                 return config_event_context_hostname;
 275         case LTTNG_EVENT_CONTEXT_IP:
 276                 return config_event_context_ip;
 277         default:
 278                 return NULL;
 279         }
 280 }
 281
 282 const char *mi_lttng_eventfieldtype_string(enum lttng_event_field_type val)
 283 {
 284         switch (val) {
 285         case(LTTNG_EVENT_FIELD_INTEGER):
 286                 return mi_lttng_element_type_integer;
 287         case(LTTNG_EVENT_FIELD_ENUM):
 288                 return mi_lttng_element_type_enum;
 289         case(LTTNG_EVENT_FIELD_FLOAT):
 290                 return mi_lttng_element_type_float;
 291         case(LTTNG_EVENT_FIELD_STRING):
 292                 return mi_lttng_element_type_string;
 293         default:
 294                 return mi_lttng_element_type_other;
 295         }
 296 }
 297
 298 const char *mi_lttng_domaintype_string(enum lttng_domain_type value)
 299 {
 300         /* Note: This is a *duplicate* of get_domain_str from bin/lttng/utils.c */
 301         switch (value) {
 302         case LTTNG_DOMAIN_KERNEL:
 303                 return config_domain_type_kernel;
 304         case LTTNG_DOMAIN_UST:
 305                 return config_domain_type_ust;
 306         case LTTNG_DOMAIN_JUL:
 307                 return config_domain_type_jul;
 308         default:
 309                 /* Should not have an unknown domain */
 310                 assert(0);
 311         }
 312 }
 313
 314 const char *mi_lttng_buffertype_string(enum lttng_buffer_type value)
 315 {
 316         switch (value) {
 317         case LTTNG_BUFFER_PER_PID:
 318                 return config_buffer_type_per_pid;
 319         case LTTNG_BUFFER_PER_UID:
 320                 return config_buffer_type_per_uid;
 321         case LTTNG_BUFFER_GLOBAL:
 322                 return config_buffer_type_global;
 323         default:
 324                 /* Should not have an unknow buffer type */
 325                 assert(0);
 326         }
 327 }
 328
 329 const char *mi_lttng_calibratetype_string(enum lttng_calibrate_type val)
 330 {
 331         const char *ret;
 332
 333         switch (val) {
 334         case LTTNG_CALIBRATE_FUNCTION:
 335                 ret = mi_lttng_element_calibrate_function;
 336                 break;
 337         default:
 338                 ret = mi_lttng_element_empty;
 339                 break;
 340         }
 341         return ret;
 342 }
 343
 344 LTTNG_HIDDEN
 345 struct mi_writer *mi_lttng_writer_create(int fd_output, int mi_output_type)
 346 {
 347         struct mi_writer *mi_writer;
 348
 349         mi_writer = zmalloc(sizeof(struct mi_writer));
 350         if (!mi_writer) {
 351                 PERROR("zmalloc mi_writer_create");
 352                 goto end;
 353         }
 354         if (mi_output_type == LTTNG_MI_XML) {
 355                 mi_writer->writer = config_writer_create(fd_output);
 356                 if (!mi_writer->writer) {
 357                         goto err_destroy;
 358                 }
 359                 mi_writer->type = LTTNG_MI_XML;
 360         } else {
 361                 goto err_destroy;
 362         }
 363
 364 end:
 365         return mi_writer;
 366
 367 err_destroy:
 368         free(mi_writer);
 369         return NULL;
 370 }
 371
 372 LTTNG_HIDDEN
 373 int mi_lttng_writer_destroy(struct mi_writer *writer)
 374 {
 375         int ret;
 376
 377         if (!writer) {
 378                 ret = -EINVAL;
 379                 goto end;
 380         }
 381
 382         ret = config_writer_destroy(writer->writer);
 383         if (ret < 0) {
 384                 goto end;
 385         }
 386
 387         free(writer);
 388 end:
 389         return ret;
 390 }
 391
 392 LTTNG_HIDDEN
 393 int mi_lttng_writer_command_open(struct mi_writer *writer, const char *command)
 394 {
 395         int ret;
 396
 397         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_command);
 398         if (ret) {
 399                 goto end;
 400         }
 401         ret = mi_lttng_writer_write_element_string(writer,
 402                         mi_lttng_element_command_name, command);
 403 end:
 404         return ret;
 405 }
 406
 407 LTTNG_HIDDEN
 408 int mi_lttng_writer_command_close(struct mi_writer *writer)
 409 {
 410         return mi_lttng_writer_close_element(writer);
 411 }
 412
 413 LTTNG_HIDDEN
 414 int mi_lttng_writer_open_element(struct mi_writer *writer,
 415                 const char *element_name)
 416 {
 417         return config_writer_open_element(writer->writer, element_name);
 418 }
 419
 420 LTTNG_HIDDEN
 421 int mi_lttng_writer_close_element(struct mi_writer *writer)
 422 {
 423         return config_writer_close_element(writer->writer);
 424 }
 425
 426 LTTNG_HIDDEN
 427 int mi_lttng_close_multi_element(struct mi_writer *writer,
 428                 unsigned int nb_element)
 429 {
 430         int ret, i;
 431
 432         if (nb_element < 1) {
 433                 ret = 0;
 434                 goto end;
 435         }
 436         for (i = 0; i < nb_element; i++) {
 437                 ret = mi_lttng_writer_close_element(writer);
 438                 if (ret) {
 439                         goto end;
 440                 }
 441         }
 442 end:
 443         return ret;
 444 }
 445
 446 LTTNG_HIDDEN
 447 int mi_lttng_writer_write_element_unsigned_int(struct mi_writer *writer,
 448                 const char *element_name, uint64_t value)
 449 {
 450         return config_writer_write_element_unsigned_int(writer->writer,
 451                         element_name, value);
 452 }
 453
 454 LTTNG_HIDDEN
 455 int mi_lttng_writer_write_element_signed_int(struct mi_writer *writer,
 456                 const char *element_name, int64_t value)
 457 {
 458         return config_writer_write_element_signed_int(writer->writer,
 459                         element_name, value);
 460 }
 461
 462 LTTNG_HIDDEN
 463 int mi_lttng_writer_write_element_bool(struct mi_writer *writer,
 464                 const char *element_name, int value)
 465 {
 466         return config_writer_write_element_bool(writer->writer,
 467                         element_name, value);
 468 }
 469
 470 LTTNG_HIDDEN
 471 int mi_lttng_writer_write_element_string(struct mi_writer *writer,
 472                 const char *element_name, const char *value)
 473 {
 474         return config_writer_write_element_string(writer->writer,
 475                         element_name, value);
 476 }
 477
 478 LTTNG_HIDDEN
 479 int mi_lttng_version(struct mi_writer *writer, struct mi_lttng_version *version,
 480         const char *lttng_description, const char *lttng_license)
 481 {
 482         int ret;
 483
 484         /* Open version */
 485         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_version);
 486         if (ret) {
 487                 goto end;
 488         }
 489
 490         /* Version string (contain info like rc etc.) */
 491         ret = mi_lttng_writer_write_element_string(writer,
 492                         mi_lttng_element_version_str, VERSION);
 493         if (ret) {
 494                 goto end;
 495         }
 496
 497         /* Major version number */
 498         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 499                         mi_lttng_element_version_major, version->version_major);
 500         if (ret) {
 501                 goto end;
 502         }
 503
 504         /* Minor version number */
 505         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 506                         mi_lttng_element_version_minor, version->version_minor);
 507         if (ret) {
 508                 goto end;
 509         }
 510
 511         /* Commit version number */
 512         ret = mi_lttng_writer_write_element_string(writer,
 513                         mi_lttng_element_version_commit, version->version_commit);
 514         if (ret) {
 515                 goto end;
 516         }
 517
 518         /* Patch number */
 519         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 520                         mi_lttng_element_version_patch_level, version->version_patchlevel);
 521         if (ret) {
 522                 goto end;
 523         }
 524
 525         /* Name of the version */
 526         ret = mi_lttng_writer_write_element_string(writer,
 527                         config_element_name, version->version_name);
 528         if (ret) {
 529                 goto end;
 530         }
 531
 532         /* Description mostly related to beer... */
 533         ret = mi_lttng_writer_write_element_string(writer,
 534                         mi_lttng_element_version_description, lttng_description);
 535         if (ret) {
 536                 goto end;
 537         }
 538
 539         /* url */
 540         ret = mi_lttng_writer_write_element_string(writer,
 541                         mi_lttng_element_version_web, version->package_url);
 542         if (ret) {
 543                 goto end;
 544         }
 545
 546         /* License: free as in free beer...no...*speech* */
 547         ret = mi_lttng_writer_write_element_string(writer,
 548                         mi_lttng_element_version_license, lttng_license);
 549         if (ret) {
 550                 goto end;
 551         }
 552
 553         /* Close version element */
 554         ret = mi_lttng_writer_close_element(writer);
 555
 556 end:
 557         return ret;
 558 }
 559
 560 LTTNG_HIDDEN
 561 int mi_lttng_sessions_open(struct mi_writer *writer)
 562 {
 563         return mi_lttng_writer_open_element(writer, config_element_sessions);
 564 }
 565
 566 LTTNG_HIDDEN
 567 int mi_lttng_session(struct mi_writer *writer,
 568                 struct lttng_session *session, int is_open)
 569 {
 570         int ret;
 571
 572         assert(session);
 573
 574         /* Open sessions element */
 575         ret = mi_lttng_writer_open_element(writer,
 576                         config_element_session);
 577         if (ret) {
 578                 goto end;
 579         }
 580
 581         /* Name of the session */
 582         ret = mi_lttng_writer_write_element_string(writer,
 583                         config_element_name, session->name);
 584         if (ret) {
 585                 goto end;
 586         }
 587
 588         /* Path */
 589         ret = mi_lttng_writer_write_element_string(writer,
 590                         config_element_path, session->path);
 591         if (ret) {
 592                 goto end;
 593         }
 594
 595         /* Enabled ? */
 596         ret = mi_lttng_writer_write_element_bool(writer,
 597                         config_element_enabled, session->enabled);
 598         if (ret) {
 599                 goto end;
 600         }
 601
 602         /* Snapshot mode */
 603         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 604                         config_element_snapshot_mode, session->snapshot_mode);
 605         if (ret) {
 606                 goto end;
 607         }
 608
 609         /* Live timer interval in usec */
 610         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 611                         config_element_live_timer_interval,
 612                         session->live_timer_interval);
 613         if (ret) {
 614                 goto end;
 615         }
 616
 617         if (!is_open) {
 618                 /* Closing session element */
 619                 ret = mi_lttng_writer_close_element(writer);
 620         }
 621 end:
 622         return ret;
 623
 624 }
 625
 626 LTTNG_HIDDEN
 627 int mi_lttng_domains_open(struct mi_writer *writer)
 628 {
 629         return mi_lttng_writer_open_element(writer, config_element_domains);
 630 }
 631
 632 LTTNG_HIDDEN
 633 int mi_lttng_domain(struct mi_writer *writer,
 634                 struct lttng_domain *domain, int is_open)
 635 {
 636         int ret = 0;
 637         const char *str_domain;
 638         const char *str_buffer;
 639
 640         assert(domain);
 641
 642         /* Open domain element */
 643         ret = mi_lttng_writer_open_element(writer, config_element_domain);
 644         if (ret) {
 645                 goto end;
 646         }
 647
 648         /* Domain Type */
 649         str_domain = mi_lttng_domaintype_string(domain->type);
 650         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
 651                         str_domain);
 652         if (ret) {
 653                 goto end;
 654         }
 655
 656         /* Buffer Type */
 657         str_buffer= mi_lttng_buffertype_string(domain->buf_type);
 658         ret = mi_lttng_writer_write_element_string(writer,
 659                         config_element_buffer_type, str_buffer);
 660         if (ret) {
 661                 goto end;
 662         }
 663
 664         /* TODO: attr... not sure how to use the union.... */
 665
 666         if (!is_open) {
 667                 /* Closing domain element */
 668                 ret = mi_lttng_writer_close_element(writer);
 669         }
 670
 671 end:
 672         return ret;
 673
 674 }
 675
 676 LTTNG_HIDDEN
 677 int mi_lttng_channels_open(struct mi_writer *writer)
 678 {
 679         return mi_lttng_writer_open_element(writer, config_element_channels);
 680 }
 681
 682 LTTNG_HIDDEN
 683 int mi_lttng_channel(struct mi_writer *writer,
 684                 struct lttng_channel *channel, int is_open)
 685 {
 686         int ret = 0;
 687
 688         assert(channel);
 689
 690         /* Opening channel element */
 691         ret = mi_lttng_writer_open_element(writer, config_element_channel);
 692         if (ret) {
 693                 goto end;
 694         }
 695
 696         /* Name */
 697         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
 698                         channel->name);
 699         if (ret) {
 700                 goto end;
 701         }
 702
 703         /* Enabled ? */
 704         ret = mi_lttng_writer_write_element_bool(writer,
 705                         config_element_enabled, channel->enabled);
 706         if (ret) {
 707                 goto end;
 708         }
 709
 710         /* Attribute */
 711         ret = mi_lttng_channel_attr(writer, &channel->attr);
 712         if (ret) {
 713                 goto end;
 714         }
 715
 716         if (!is_open) {
 717                 /* Closing channel element */
 718                 ret = mi_lttng_writer_close_element(writer);
 719                 if (ret) {
 720                         goto end;
 721                 }
 722         }
 723 end:
 724         return ret;
 725 }
 726
 727 LTTNG_HIDDEN
 728 int mi_lttng_channel_attr(struct mi_writer *writer,
 729                 struct lttng_channel_attr *attr)
 730 {
 731         int ret = 0;
 732
 733         assert(attr);
 734
 735         /* Opening Attributes */
 736         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
 737         if (ret) {
 738                 goto end;
 739         }
 740
 741         /* Overwrite */
 742         ret = mi_lttng_writer_write_element_string(writer,
 743                 config_element_overwrite_mode,
 744                 attr->overwrite ? config_overwrite_mode_overwrite :
 745                         config_overwrite_mode_discard);
 746         if (ret) {
 747                 goto end;
 748         }
 749
 750         /* Sub buffer size in byte */
 751         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 752                 config_element_subbuf_size, attr->subbuf_size);
 753         if (ret) {
 754                 goto end;
 755         }
 756
 757         /* Number of subbuffer (power of two) */
 758         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 759                 config_element_num_subbuf,
 760                 attr->num_subbuf);
 761         if (ret) {
 762                 goto end;
 763         }
 764
 765         /* Switch timer interval in usec */
 766         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 767                 config_element_switch_timer_interval,
 768                 attr->switch_timer_interval);
 769         if (ret) {
 770                 goto end;
 771         }
 772
 773         /* Read timer interval in usec */
 774         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 775                 config_element_read_timer_interval,
 776                 attr->read_timer_interval);
 777         if (ret) {
 778                 goto end;
 779         }
 780
 781         /* Event output */
 782         ret = mi_lttng_writer_write_element_string(writer,
 783                 config_element_output_type,
 784                 attr->output == LTTNG_EVENT_SPLICE ?
 785                 config_output_type_splice : config_output_type_mmap);
 786         if (ret) {
 787                 goto end;
 788         }
 789
 790         /* Tracefile size in bytes */
 791         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 792                 config_element_tracefile_size, attr->tracefile_size);
 793         if (ret) {
 794                 goto end;
 795         }
 796
 797         /* Count of tracefiles */
 798         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 799                 config_element_tracefile_count,
 800                 attr->tracefile_count);
 801         if (ret) {
 802                 goto end;
 803         }
 804
 805         /* Live timer interval in usec*/
 806         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 807                 config_element_live_timer_interval,
 808                 attr->live_timer_interval);
 809         if (ret) {
 810                 goto end;
 811         }
 812
 813         /* Closing attributes */
 814         ret = mi_lttng_writer_close_element(writer);
 815         if (ret) {
 816                 goto end;
 817         }
 818 end:
 819         return ret;
 820
 821 }
 822
 823 LTTNG_HIDDEN
 824 int mi_lttng_event_common_attributes(struct mi_writer *writer,
 825                 struct lttng_event *event)
 826 {
 827         int ret;
 828
 829         /* Open event element */
 830         ret = mi_lttng_writer_open_element(writer, config_element_event);
 831         if (ret) {
 832                 goto end;
 833         }
 834
 835         /* Event name */
 836         ret = mi_lttng_writer_write_element_string(writer,
 837                         config_element_name, event->name);
 838         if (ret) {
 839                 goto end;
 840         }
 841
 842         /* Event type */
 843         ret = mi_lttng_writer_write_element_string(writer,
 844                         config_element_type, mi_lttng_eventtype_string(event->type));
 845         if (ret) {
 846                 goto end;
 847         }
 848
 849         /* Is event enabled */
 850         ret = mi_lttng_writer_write_element_bool(writer,
 851                         config_element_enabled, event->enabled);
 852         if (ret) {
 853                 goto end;
 854         }
 855
 856         /* Event filter enabled? */
 857         ret = mi_lttng_writer_write_element_bool(writer,
 858                         config_element_filter, event->filter);
 859
 860 end:
 861         return ret;
 862 }
 863
 864 LTTNG_HIDDEN
 865 int mi_lttng_event_tracepoint_loglevel(struct mi_writer *writer,
 866                 struct lttng_event *event)
 867 {
 868         int ret;
 869
 870         /* Event loglevel */
 871         ret = mi_lttng_writer_write_element_string(writer,
 872                         config_element_loglevel, mi_lttng_loglevel_string(event->loglevel));
 873         if (ret) {
 874                 goto end;
 875         }
 876
 877         /* Log level type */
 878         ret = mi_lttng_writer_write_element_string(writer,
 879                         config_element_loglevel_type,
 880                         mi_lttng_logleveltype_string(event->loglevel_type));
 881         if (ret) {
 882                 goto end;
 883         }
 884
 885         /* event exclusion filter */
 886         ret = mi_lttng_writer_write_element_bool(writer,
 887                         config_element_exclusion, event->exclusion);
 888         if (ret) {
 889                 goto end;
 890         }
 891
 892 end:
 893         return ret;
 894 }
 895
 896 LTTNG_HIDDEN
 897 int mi_lttng_event_tracepoint_no_loglevel(struct mi_writer *writer,
 898                 struct lttng_event *event)
 899 {
 900         /* event exclusion filter */
 901         return mi_lttng_writer_write_element_bool(writer,
 902                         config_element_exclusion, event->exclusion);
 903 }
 904
 905 LTTNG_HIDDEN
 906 int mi_lttng_event_function_probe(struct mi_writer *writer,
 907                 struct lttng_event *event)
 908 {
 909         int ret;
 910
 911         if (event->attr.probe.addr != 0) {
 912                 /* event probe address */
 913                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
 914                                 config_element_address, event->attr.probe.addr);
 915                 if (ret) {
 916                         goto end;
 917                 }
 918         } else {
 919                 /* event probe offset */
 920                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
 921                                 config_element_offset, event->attr.probe.offset);
 922                 if (ret) {
 923                         goto end;
 924                 }
 925
 926                 /* event probe symbol_name */
 927                 ret = mi_lttng_writer_write_element_string(writer,
 928                                 config_element_symbol_name, event->attr.probe.symbol_name);
 929                 if (ret) {
 930                         goto end;
 931                 }
 932         }
 933 end:
 934         return ret;
 935 }
 936
 937 LTTNG_HIDDEN
 938 int mi_lttng_event_function_entry(struct mi_writer *writer,
 939                 struct lttng_event *event)
 940 {
 941         /* event probe symbol_name */
 942         return mi_lttng_writer_write_element_string(writer,
 943                         config_element_symbol_name, event->attr.ftrace.symbol_name);
 944 }
 945
 946 LTTNG_HIDDEN
 947 int mi_lttng_events_open(struct mi_writer *writer)
 948 {
 949         return mi_lttng_writer_open_element(writer, config_element_events);
 950 }
 951
 952 LTTNG_HIDDEN
 953 int mi_lttng_event(struct mi_writer *writer,
 954                 struct lttng_event *event, int is_open)
 955 {
 956         int ret;
 957
 958         ret = mi_lttng_event_common_attributes(writer, event);
 959         if (ret) {
 960                 goto end;
 961         }
 962
 963         switch (event->type) {
 964         case LTTNG_EVENT_TRACEPOINT:
 965         {
 966                 if (event->loglevel != -1) {
 967                         ret = mi_lttng_event_tracepoint_loglevel(writer, event);
 968                 } else {
 969                         ret = mi_lttng_event_tracepoint_no_loglevel(writer, event);
 970                 }
 971                 break;
 972         }
 973         case LTTNG_EVENT_PROBE:
 974                 ret = mi_lttng_event_function_probe(writer, event);
 975                 break;
 976         case LTTNG_EVENT_FUNCTION_ENTRY:
 977                 ret = mi_lttng_event_function_entry(writer, event);
 978                 break;
 979         case LTTNG_EVENT_ALL:
 980                 /* Fallthrough */
 981         default:
 982                 break;
 983         }
 984
 985         if (!is_open) {
 986                 ret = mi_lttng_writer_close_element(writer);
 987         }
 988
 989 end:
 990         return ret;
 991 }
 992
 993 LTTNG_HIDDEN
 994 int mi_lttng_pids_open(struct mi_writer *writer)
 995 {
 996         return mi_lttng_writer_open_element(writer, mi_lttng_element_pids);
 997 }
 998
 999 LTTNG_HIDDEN
1000 int mi_lttng_pid(struct mi_writer *writer, pid_t pid , const char *cmdline,
1001                 int is_open)
1002 {
1003         int ret;
1004
1005         /* Open element pid */
1006         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_pid);
1007         if (ret) {
1008                 goto end;
1009         }
1010
1011         /* Writing pid number */
1012         ret = mi_lttng_writer_write_element_signed_int(writer,
1013                         mi_lttng_element_pid_id, (int)pid);
1014         if (ret) {
1015                 goto end;
1016         }
1017
1018         /* Writing name of the process */
1019         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1020                         cmdline);
1021         if (ret) {
1022                 goto end;
1023         }
1024
1025         if (!is_open) {
1026                 /* Closing Pid */
1027                 ret = mi_lttng_writer_close_element(writer);
1028         }
1029
1030 end:
1031         return ret;
1032 }
1033
1034 LTTNG_HIDDEN
1035 int mi_lttng_event_fields_open(struct mi_writer *writer)
1036 {
1037         return mi_lttng_writer_open_element(writer, mi_lttng_element_event_fields);
1038 }
1039
1040 LTTNG_HIDDEN
1041 int mi_lttng_event_field(struct mi_writer *writer,
1042                 struct lttng_event_field *field)
1043 {
1044         int ret;
1045
1046         if (!field->field_name[0]) {
1047                 ret = 0;
1048                 goto end;
1049         }
1050
1051         /* Open field */
1052         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_event_field);
1053         if (ret) {
1054                 goto end;
1055         }
1056
1057         if (!field->field_name[0]) {
1058                 goto close;
1059         }
1060
1061         /* Name */
1062         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1063                         field->field_name);
1064         if (ret) {
1065                 goto end;
1066         }
1067
1068         /* Type */
1069         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1070                         mi_lttng_eventfieldtype_string(field->type));
1071         if (ret) {
1072                 goto end;
1073         }
1074
1075         /* nowrite  */
1076         ret = mi_lttng_writer_write_element_signed_int(writer,
1077                         mi_lttng_element_nowrite, field->nowrite);
1078         if (ret) {
1079                 goto end;
1080         }
1081
1082 close:
1083         /* Close field element */
1084         ret = mi_lttng_writer_close_element(writer);
1085
1086 end:
1087         return ret;
1088 }
1089
1090 LTTNG_HIDDEN
1091 int mi_lttng_calibrate(struct mi_writer *writer,
1092                 struct lttng_calibrate *calibrate)
1093 {
1094         int ret;
1095
1096         /* Open calibrate element */
1097         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_calibrate);
1098         if (ret) {
1099                 goto end;
1100         }
1101
1102         /* Calibration type */
1103         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1104                         mi_lttng_calibratetype_string(calibrate->type));
1105         if (ret) {
1106                 goto end;
1107         }
1108
1109         /* Closing calibrate element */
1110         ret = mi_lttng_writer_close_element(writer);
1111 end:
1112         return ret;
1113 }
1114 LTTNG_HIDDEN
1115 int mi_lttng_context(struct mi_writer *writer,
1116                 struct lttng_event_context *context, int is_open)
1117 {
1118         int ret;
1119         const char *type_string;
1120         struct lttng_event_perf_counter_ctx *perf_context;
1121         /* Open context */
1122         ret = mi_lttng_writer_open_element(writer , config_element_context);
1123         if (ret) {
1124                 goto end;
1125         }
1126
1127         type_string = mi_lttng_event_contexttype_string(context->ctx);
1128         if (!type_string) {
1129                 ret = -LTTNG_ERR_INVALID;
1130                 goto end;
1131         }
1132
1133         /* Print context type */
1134         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1135                         type_string);
1136
1137         /* Special case for PERF_*_COUNTER
1138          * print the lttng_event_perf_counter_ctx*/
1139         switch (context->ctx) {
1140         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
1141         case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
1142         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
1143                 perf_context = &context->u.perf_counter;
1144                 ret =  mi_lttng_perf_counter_context(writer, perf_context);
1145                 if (ret) {
1146                         goto end;
1147                 }
1148                 break;
1149         default:
1150                 break;
1151         }
1152
1153         /* Close context */
1154         if (!is_open) {
1155                 ret = mi_lttng_writer_close_element(writer);
1156         }
1157
1158 end:
1159         return ret;
1160 }
1161
1162 LTTNG_HIDDEN
1163 int mi_lttng_perf_counter_context(struct mi_writer *writer,
1164                 struct lttng_event_perf_counter_ctx  *perf_context)
1165 {
1166         int ret;
1167
1168         /* Open perf_counter_context */
1169         ret = mi_lttng_writer_open_element(writer,
1170                         mi_lttng_element_perf_counter_context);
1171         if (ret) {
1172                 goto end;
1173         }
1174
1175         /* Type */
1176         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1177                         config_element_type, perf_context->type);
1178         if (ret) {
1179                 goto end;
1180         }
1181
1182         /* Config */
1183         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1184                         config_element_config, perf_context->config);
1185         if (ret) {
1186                 goto end;
1187         }
1188
1189         /* Name of the perf counter */
1190         ret = mi_lttng_writer_write_element_string(writer,
1191                         config_element_name, perf_context->name);
1192         if (ret) {
1193                 goto end;
1194         }
1195
1196         /* Close perf_counter_context */
1197         ret = mi_lttng_writer_close_element(writer);
1198 end:
1199         return ret;
1200 }
1201
1202 LTTNG_HIDDEN
1203 int mi_lttng_snapshot_output_session_name(struct mi_writer *writer,
1204                 const char *session_name)
1205 {
1206         int ret;
1207
1208         /* Open session element */
1209         ret = mi_lttng_writer_open_element(writer, config_element_session);
1210         if (ret) {
1211                 goto end;
1212         }
1213
1214         /* Snapshot output list for current session name */
1215         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1216                         session_name);
1217
1218         /* Open element snapshots (sequence one snapshot) */
1219         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_snapshots);
1220         if (ret) {
1221                 goto end;
1222         }
1223
1224 end:
1225         return ret;
1226 }
1227
1228 LTTNG_HIDDEN
1229 int mi_lttng_snapshot_list_output(struct mi_writer *writer,
1230                 struct lttng_snapshot_output *output)
1231 {
1232         int ret;
1233
1234         /* Open element snapshot output */
1235         ret = mi_lttng_writer_open_element(writer,
1236                         mi_lttng_element_command_snapshot);
1237         if (ret) {
1238                 goto end;
1239         }
1240
1241         /* ID of the snapshot output */
1242         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1243                         mi_lttng_element_id, output->id);
1244         if (ret) {
1245                 goto end;
1246         }
1247
1248         /* Name of the output */
1249         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1250                         output->name);
1251         if (ret) {
1252                 goto end;
1253         }
1254
1255         /* Destination of the output (ctrl_url)*/
1256         ret = mi_lttng_writer_write_element_string(writer,
1257                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1258         if (ret) {
1259                 goto end;
1260         }
1261
1262         /* Destination of the output (data_url) */
1263         ret = mi_lttng_writer_write_element_string(writer,
1264                         mi_lttng_element_snapshot_data_url, output->data_url);
1265         if (ret) {
1266                 goto end;
1267         }
1268
1269         /* total size of all stream combined */
1270         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1271                         mi_lttng_element_snapshot_max_size, output->max_size);
1272         if (ret) {
1273                 goto end;
1274         }
1275
1276         /* Close snapshot output element */
1277         ret = mi_lttng_writer_close_element(writer);
1278
1279 end:
1280         return ret;
1281 }
1282
1283 LTTNG_HIDDEN
1284 int mi_lttng_snapshot_del_output(struct mi_writer *writer, int id,
1285                 const char *name, const char *current_session_name)
1286 {
1287         int ret;
1288
1289         /* Open element del_snapshot */
1290         ret = mi_lttng_writer_open_element(writer,
1291                         mi_lttng_element_command_snapshot);
1292         if (ret) {
1293                 goto end;
1294         }
1295
1296
1297         if (id != UINT32_MAX) {
1298                 /* "Snapshot output "id" successfully deleted
1299                  * for "current_session_name"
1300                  * ID of the snapshot output
1301                  */
1302                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1303                                 mi_lttng_element_id, id);
1304                 if (ret) {
1305                         goto end;
1306                 }
1307         } else {
1308                 /* "Snapshot output "name" successfully deleted
1309                  * for session "current_session_name"
1310                  * Name of the output
1311                  */
1312                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1313                                 name);
1314                 if (ret) {
1315                         goto end;
1316                 }
1317         }
1318
1319         /* Snapshot was deleted for session "current_session_name"*/
1320         ret = mi_lttng_writer_write_element_string(writer,
1321                         mi_lttng_element_snapshot_session_name,
1322                         current_session_name);
1323         if (ret) {
1324                 goto end;
1325         }
1326
1327         /* Close snapshot element */
1328         ret = mi_lttng_writer_close_element(writer);
1329
1330 end:
1331         return ret;
1332 }
1333
1334 LTTNG_HIDDEN
1335 int mi_lttng_snapshot_add_output(struct mi_writer *writer,
1336                 const char *current_session_name, const char *n_ptr,
1337                 struct lttng_snapshot_output *output)
1338 {
1339         int ret;
1340
1341         /* Open element snapshot */
1342         ret = mi_lttng_writer_open_element(writer,
1343                         mi_lttng_element_command_snapshot);
1344         if (ret) {
1345                 goto end;
1346         }
1347
1348         /* Snapshot output id */
1349         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1350                         mi_lttng_element_id, output->id);
1351         if (ret) {
1352                 goto end;
1353         }
1354
1355         /* Snapshot output names */
1356         ret = mi_lttng_writer_write_element_string(writer,
1357                         config_element_name, n_ptr);
1358         if (ret) {
1359                 goto end;
1360         }
1361
1362         /* Destination of the output (ctrl_url)*/
1363         ret = mi_lttng_writer_write_element_string(writer,
1364                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1365         if (ret) {
1366                 goto end;
1367         }
1368
1369         /* Snapshot added for session "current_session_name"*/
1370         ret = mi_lttng_writer_write_element_string(writer,
1371                         mi_lttng_element_snapshot_session_name, current_session_name);
1372         if (ret) {
1373                 goto end;
1374         }
1375
1376         /* total size of all stream combined */
1377         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1378                         mi_lttng_element_snapshot_max_size, output->max_size);
1379         if (ret) {
1380                 goto end;
1381         }
1382
1383         /* Close snapshot element */
1384         ret = mi_lttng_writer_close_element(writer);
1385
1386 end:
1387         return ret;
1388 }
1389
1390 LTTNG_HIDDEN
1391 int mi_lttng_snapshot_record(struct mi_writer *writer,
1392                 const char *current_session_name, const char *url,
1393                 const char *cmdline_ctrl_url, const char *cmdline_data_url)
1394 {
1395         int ret;
1396
1397         /* Open element snapshot */
1398         ret = mi_lttng_writer_open_element(writer,
1399                         mi_lttng_element_command_snapshot);
1400         if (ret) {
1401                 goto end;
1402         }
1403
1404         /*
1405          * If a valid an URL was given, serialize it,
1406          * else take the command line data and ctrl urls*/
1407         if (url) {
1408                 /* Destination of the output (ctrl_url)*/
1409                 ret = mi_lttng_writer_write_element_string(writer,
1410                                 mi_lttng_element_snapshot_ctrl_url, url);
1411                 if (ret) {
1412                         goto end;
1413                 }
1414         } else if (cmdline_ctrl_url) {
1415                 /* Destination of the output (ctrl_url)*/
1416                 ret = mi_lttng_writer_write_element_string(writer,
1417                                 mi_lttng_element_snapshot_ctrl_url, cmdline_ctrl_url);
1418                 if (ret) {
1419                         goto end;
1420                 }
1421
1422                 /* Destination of the output (data_url) */
1423                 ret = mi_lttng_writer_write_element_string(writer,
1424                                 mi_lttng_element_snapshot_data_url, cmdline_data_url);
1425                 if (ret) {
1426                         goto end;
1427                 }
1428         }
1429
1430         /* Close record_snapshot element */
1431         ret = mi_lttng_writer_close_element(writer);
1432
1433 end:
1434         return ret;
1435 }