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: union  attr
 665          * This union is not currently used and was added for
 666          * future ust domain support.
 667          * Date: 25-06-2014
 668          * */
 669
 670         if (!is_open) {
 671                 /* Closing domain element */
 672                 ret = mi_lttng_writer_close_element(writer);
 673         }
 674
 675 end:
 676         return ret;
 677
 678 }
 679
 680 LTTNG_HIDDEN
 681 int mi_lttng_channels_open(struct mi_writer *writer)
 682 {
 683         return mi_lttng_writer_open_element(writer, config_element_channels);
 684 }
 685
 686 LTTNG_HIDDEN
 687 int mi_lttng_channel(struct mi_writer *writer,
 688                 struct lttng_channel *channel, int is_open)
 689 {
 690         int ret = 0;
 691
 692         assert(channel);
 693
 694         /* Opening channel element */
 695         ret = mi_lttng_writer_open_element(writer, config_element_channel);
 696         if (ret) {
 697                 goto end;
 698         }
 699
 700         /* Name */
 701         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
 702                         channel->name);
 703         if (ret) {
 704                 goto end;
 705         }
 706
 707         /* Enabled ? */
 708         ret = mi_lttng_writer_write_element_bool(writer,
 709                         config_element_enabled, channel->enabled);
 710         if (ret) {
 711                 goto end;
 712         }
 713
 714         /* Attribute */
 715         ret = mi_lttng_channel_attr(writer, &channel->attr);
 716         if (ret) {
 717                 goto end;
 718         }
 719
 720         if (!is_open) {
 721                 /* Closing channel element */
 722                 ret = mi_lttng_writer_close_element(writer);
 723                 if (ret) {
 724                         goto end;
 725                 }
 726         }
 727 end:
 728         return ret;
 729 }
 730
 731 LTTNG_HIDDEN
 732 int mi_lttng_channel_attr(struct mi_writer *writer,
 733                 struct lttng_channel_attr *attr)
 734 {
 735         int ret = 0;
 736
 737         assert(attr);
 738
 739         /* Opening Attributes */
 740         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
 741         if (ret) {
 742                 goto end;
 743         }
 744
 745         /* Overwrite */
 746         ret = mi_lttng_writer_write_element_string(writer,
 747                 config_element_overwrite_mode,
 748                 attr->overwrite ? config_overwrite_mode_overwrite :
 749                         config_overwrite_mode_discard);
 750         if (ret) {
 751                 goto end;
 752         }
 753
 754         /* Sub buffer size in byte */
 755         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 756                 config_element_subbuf_size, attr->subbuf_size);
 757         if (ret) {
 758                 goto end;
 759         }
 760
 761         /* Number of subbuffer (power of two) */
 762         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 763                 config_element_num_subbuf,
 764                 attr->num_subbuf);
 765         if (ret) {
 766                 goto end;
 767         }
 768
 769         /* Switch timer interval in usec */
 770         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 771                 config_element_switch_timer_interval,
 772                 attr->switch_timer_interval);
 773         if (ret) {
 774                 goto end;
 775         }
 776
 777         /* Read timer interval in usec */
 778         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 779                 config_element_read_timer_interval,
 780                 attr->read_timer_interval);
 781         if (ret) {
 782                 goto end;
 783         }
 784
 785         /* Event output */
 786         ret = mi_lttng_writer_write_element_string(writer,
 787                 config_element_output_type,
 788                 attr->output == LTTNG_EVENT_SPLICE ?
 789                 config_output_type_splice : config_output_type_mmap);
 790         if (ret) {
 791                 goto end;
 792         }
 793
 794         /* Tracefile size in bytes */
 795         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 796                 config_element_tracefile_size, attr->tracefile_size);
 797         if (ret) {
 798                 goto end;
 799         }
 800
 801         /* Count of tracefiles */
 802         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 803                 config_element_tracefile_count,
 804                 attr->tracefile_count);
 805         if (ret) {
 806                 goto end;
 807         }
 808
 809         /* Live timer interval in usec*/
 810         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 811                 config_element_live_timer_interval,
 812                 attr->live_timer_interval);
 813         if (ret) {
 814                 goto end;
 815         }
 816
 817         /* Closing attributes */
 818         ret = mi_lttng_writer_close_element(writer);
 819         if (ret) {
 820                 goto end;
 821         }
 822 end:
 823         return ret;
 824
 825 }
 826
 827 LTTNG_HIDDEN
 828 int mi_lttng_event_common_attributes(struct mi_writer *writer,
 829                 struct lttng_event *event)
 830 {
 831         int ret;
 832
 833         /* Open event element */
 834         ret = mi_lttng_writer_open_element(writer, config_element_event);
 835         if (ret) {
 836                 goto end;
 837         }
 838
 839         /* Event name */
 840         ret = mi_lttng_writer_write_element_string(writer,
 841                         config_element_name, event->name);
 842         if (ret) {
 843                 goto end;
 844         }
 845
 846         /* Event type */
 847         ret = mi_lttng_writer_write_element_string(writer,
 848                         config_element_type, mi_lttng_eventtype_string(event->type));
 849         if (ret) {
 850                 goto end;
 851         }
 852
 853         /* Is event enabled */
 854         ret = mi_lttng_writer_write_element_bool(writer,
 855                         config_element_enabled, event->enabled);
 856         if (ret) {
 857                 goto end;
 858         }
 859
 860         /* Event filter enabled? */
 861         ret = mi_lttng_writer_write_element_bool(writer,
 862                         config_element_filter, event->filter);
 863
 864 end:
 865         return ret;
 866 }
 867
 868 LTTNG_HIDDEN
 869 int mi_lttng_event_tracepoint_loglevel(struct mi_writer *writer,
 870                 struct lttng_event *event)
 871 {
 872         int ret;
 873
 874         /* Event loglevel */
 875         ret = mi_lttng_writer_write_element_string(writer,
 876                         config_element_loglevel, mi_lttng_loglevel_string(event->loglevel));
 877         if (ret) {
 878                 goto end;
 879         }
 880
 881         /* Log level type */
 882         ret = mi_lttng_writer_write_element_string(writer,
 883                         config_element_loglevel_type,
 884                         mi_lttng_logleveltype_string(event->loglevel_type));
 885         if (ret) {
 886                 goto end;
 887         }
 888
 889         /* event exclusion filter */
 890         ret = mi_lttng_writer_write_element_bool(writer,
 891                         config_element_exclusion, event->exclusion);
 892         if (ret) {
 893                 goto end;
 894         }
 895
 896 end:
 897         return ret;
 898 }
 899
 900 LTTNG_HIDDEN
 901 int mi_lttng_event_tracepoint_no_loglevel(struct mi_writer *writer,
 902                 struct lttng_event *event)
 903 {
 904         /* event exclusion filter */
 905         return mi_lttng_writer_write_element_bool(writer,
 906                         config_element_exclusion, event->exclusion);
 907 }
 908
 909 LTTNG_HIDDEN
 910 int mi_lttng_event_function_probe(struct mi_writer *writer,
 911                 struct lttng_event *event)
 912 {
 913         int ret;
 914
 915         if (event->attr.probe.addr != 0) {
 916                 /* event probe address */
 917                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
 918                                 config_element_address, event->attr.probe.addr);
 919                 if (ret) {
 920                         goto end;
 921                 }
 922         } else {
 923                 /* event probe offset */
 924                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
 925                                 config_element_offset, event->attr.probe.offset);
 926                 if (ret) {
 927                         goto end;
 928                 }
 929
 930                 /* event probe symbol_name */
 931                 ret = mi_lttng_writer_write_element_string(writer,
 932                                 config_element_symbol_name, event->attr.probe.symbol_name);
 933                 if (ret) {
 934                         goto end;
 935                 }
 936         }
 937 end:
 938         return ret;
 939 }
 940
 941 LTTNG_HIDDEN
 942 int mi_lttng_event_function_entry(struct mi_writer *writer,
 943                 struct lttng_event *event)
 944 {
 945         /* event probe symbol_name */
 946         return mi_lttng_writer_write_element_string(writer,
 947                         config_element_symbol_name, event->attr.ftrace.symbol_name);
 948 }
 949
 950 LTTNG_HIDDEN
 951 int mi_lttng_events_open(struct mi_writer *writer)
 952 {
 953         return mi_lttng_writer_open_element(writer, config_element_events);
 954 }
 955
 956 LTTNG_HIDDEN
 957 int mi_lttng_event(struct mi_writer *writer,
 958                 struct lttng_event *event, int is_open)
 959 {
 960         int ret;
 961
 962         ret = mi_lttng_event_common_attributes(writer, event);
 963         if (ret) {
 964                 goto end;
 965         }
 966
 967         switch (event->type) {
 968         case LTTNG_EVENT_TRACEPOINT:
 969         {
 970                 if (event->loglevel != -1) {
 971                         ret = mi_lttng_event_tracepoint_loglevel(writer, event);
 972                 } else {
 973                         ret = mi_lttng_event_tracepoint_no_loglevel(writer, event);
 974                 }
 975                 break;
 976         }
 977         case LTTNG_EVENT_PROBE:
 978                 ret = mi_lttng_event_function_probe(writer, event);
 979                 break;
 980         case LTTNG_EVENT_FUNCTION_ENTRY:
 981                 ret = mi_lttng_event_function_entry(writer, event);
 982                 break;
 983         case LTTNG_EVENT_ALL:
 984                 /* Fallthrough */
 985         default:
 986                 break;
 987         }
 988
 989         if (!is_open) {
 990                 ret = mi_lttng_writer_close_element(writer);
 991         }
 992
 993 end:
 994         return ret;
 995 }
 996
 997 LTTNG_HIDDEN
 998 int mi_lttng_pids_open(struct mi_writer *writer)
 999 {
1000         return mi_lttng_writer_open_element(writer, mi_lttng_element_pids);
1001 }
1002
1003 LTTNG_HIDDEN
1004 int mi_lttng_pid(struct mi_writer *writer, pid_t pid , const char *cmdline,
1005                 int is_open)
1006 {
1007         int ret;
1008
1009         /* Open element pid */
1010         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_pid);
1011         if (ret) {
1012                 goto end;
1013         }
1014
1015         /* Writing pid number */
1016         ret = mi_lttng_writer_write_element_signed_int(writer,
1017                         mi_lttng_element_pid_id, (int)pid);
1018         if (ret) {
1019                 goto end;
1020         }
1021
1022         /* Writing name of the process */
1023         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1024                         cmdline);
1025         if (ret) {
1026                 goto end;
1027         }
1028
1029         if (!is_open) {
1030                 /* Closing Pid */
1031                 ret = mi_lttng_writer_close_element(writer);
1032         }
1033
1034 end:
1035         return ret;
1036 }
1037
1038 LTTNG_HIDDEN
1039 int mi_lttng_event_fields_open(struct mi_writer *writer)
1040 {
1041         return mi_lttng_writer_open_element(writer, mi_lttng_element_event_fields);
1042 }
1043
1044 LTTNG_HIDDEN
1045 int mi_lttng_event_field(struct mi_writer *writer,
1046                 struct lttng_event_field *field)
1047 {
1048         int ret;
1049
1050         if (!field->field_name[0]) {
1051                 ret = 0;
1052                 goto end;
1053         }
1054
1055         /* Open field */
1056         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_event_field);
1057         if (ret) {
1058                 goto end;
1059         }
1060
1061         if (!field->field_name[0]) {
1062                 goto close;
1063         }
1064
1065         /* Name */
1066         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1067                         field->field_name);
1068         if (ret) {
1069                 goto end;
1070         }
1071
1072         /* Type */
1073         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1074                         mi_lttng_eventfieldtype_string(field->type));
1075         if (ret) {
1076                 goto end;
1077         }
1078
1079         /* nowrite  */
1080         ret = mi_lttng_writer_write_element_signed_int(writer,
1081                         mi_lttng_element_nowrite, field->nowrite);
1082         if (ret) {
1083                 goto end;
1084         }
1085
1086 close:
1087         /* Close field element */
1088         ret = mi_lttng_writer_close_element(writer);
1089
1090 end:
1091         return ret;
1092 }
1093
1094 LTTNG_HIDDEN
1095 int mi_lttng_calibrate(struct mi_writer *writer,
1096                 struct lttng_calibrate *calibrate)
1097 {
1098         int ret;
1099
1100         /* Open calibrate element */
1101         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_calibrate);
1102         if (ret) {
1103                 goto end;
1104         }
1105
1106         /* Calibration type */
1107         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1108                         mi_lttng_calibratetype_string(calibrate->type));
1109         if (ret) {
1110                 goto end;
1111         }
1112
1113         /* Closing calibrate element */
1114         ret = mi_lttng_writer_close_element(writer);
1115 end:
1116         return ret;
1117 }
1118 LTTNG_HIDDEN
1119 int mi_lttng_context(struct mi_writer *writer,
1120                 struct lttng_event_context *context, int is_open)
1121 {
1122         int ret;
1123         const char *type_string;
1124         struct lttng_event_perf_counter_ctx *perf_context;
1125         /* Open context */
1126         ret = mi_lttng_writer_open_element(writer , config_element_context);
1127         if (ret) {
1128                 goto end;
1129         }
1130
1131         type_string = mi_lttng_event_contexttype_string(context->ctx);
1132         if (!type_string) {
1133                 ret = -LTTNG_ERR_INVALID;
1134                 goto end;
1135         }
1136
1137         /* Print context type */
1138         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1139                         type_string);
1140
1141         /* Special case for PERF_*_COUNTER
1142          * print the lttng_event_perf_counter_ctx*/
1143         switch (context->ctx) {
1144         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
1145         case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
1146         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
1147                 perf_context = &context->u.perf_counter;
1148                 ret =  mi_lttng_perf_counter_context(writer, perf_context);
1149                 if (ret) {
1150                         goto end;
1151                 }
1152                 break;
1153         default:
1154                 break;
1155         }
1156
1157         /* Close context */
1158         if (!is_open) {
1159                 ret = mi_lttng_writer_close_element(writer);
1160         }
1161
1162 end:
1163         return ret;
1164 }
1165
1166 LTTNG_HIDDEN
1167 int mi_lttng_perf_counter_context(struct mi_writer *writer,
1168                 struct lttng_event_perf_counter_ctx  *perf_context)
1169 {
1170         int ret;
1171
1172         /* Open perf_counter_context */
1173         ret = mi_lttng_writer_open_element(writer,
1174                         mi_lttng_element_perf_counter_context);
1175         if (ret) {
1176                 goto end;
1177         }
1178
1179         /* Type */
1180         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1181                         config_element_type, perf_context->type);
1182         if (ret) {
1183                 goto end;
1184         }
1185
1186         /* Config */
1187         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1188                         config_element_config, perf_context->config);
1189         if (ret) {
1190                 goto end;
1191         }
1192
1193         /* Name of the perf counter */
1194         ret = mi_lttng_writer_write_element_string(writer,
1195                         config_element_name, perf_context->name);
1196         if (ret) {
1197                 goto end;
1198         }
1199
1200         /* Close perf_counter_context */
1201         ret = mi_lttng_writer_close_element(writer);
1202 end:
1203         return ret;
1204 }
1205
1206 LTTNG_HIDDEN
1207 int mi_lttng_snapshot_output_session_name(struct mi_writer *writer,
1208                 const char *session_name)
1209 {
1210         int ret;
1211
1212         /* Open session element */
1213         ret = mi_lttng_writer_open_element(writer, config_element_session);
1214         if (ret) {
1215                 goto end;
1216         }
1217
1218         /* Snapshot output list for current session name */
1219         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1220                         session_name);
1221
1222         /* Open element snapshots (sequence one snapshot) */
1223         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_snapshots);
1224         if (ret) {
1225                 goto end;
1226         }
1227
1228 end:
1229         return ret;
1230 }
1231
1232 LTTNG_HIDDEN
1233 int mi_lttng_snapshot_list_output(struct mi_writer *writer,
1234                 struct lttng_snapshot_output *output)
1235 {
1236         int ret;
1237
1238         /* Open element snapshot output */
1239         ret = mi_lttng_writer_open_element(writer,
1240                         mi_lttng_element_command_snapshot);
1241         if (ret) {
1242                 goto end;
1243         }
1244
1245         /* ID of the snapshot output */
1246         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1247                         mi_lttng_element_id, output->id);
1248         if (ret) {
1249                 goto end;
1250         }
1251
1252         /* Name of the output */
1253         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1254                         output->name);
1255         if (ret) {
1256                 goto end;
1257         }
1258
1259         /* Destination of the output (ctrl_url)*/
1260         ret = mi_lttng_writer_write_element_string(writer,
1261                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1262         if (ret) {
1263                 goto end;
1264         }
1265
1266         /* Destination of the output (data_url) */
1267         ret = mi_lttng_writer_write_element_string(writer,
1268                         mi_lttng_element_snapshot_data_url, output->data_url);
1269         if (ret) {
1270                 goto end;
1271         }
1272
1273         /* total size of all stream combined */
1274         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1275                         mi_lttng_element_snapshot_max_size, output->max_size);
1276         if (ret) {
1277                 goto end;
1278         }
1279
1280         /* Close snapshot output element */
1281         ret = mi_lttng_writer_close_element(writer);
1282
1283 end:
1284         return ret;
1285 }
1286
1287 LTTNG_HIDDEN
1288 int mi_lttng_snapshot_del_output(struct mi_writer *writer, int id,
1289                 const char *name, const char *current_session_name)
1290 {
1291         int ret;
1292
1293         /* Open element del_snapshot */
1294         ret = mi_lttng_writer_open_element(writer,
1295                         mi_lttng_element_command_snapshot);
1296         if (ret) {
1297                 goto end;
1298         }
1299
1300
1301         if (id != UINT32_MAX) {
1302                 /* "Snapshot output "id" successfully deleted
1303                  * for "current_session_name"
1304                  * ID of the snapshot output
1305                  */
1306                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1307                                 mi_lttng_element_id, id);
1308                 if (ret) {
1309                         goto end;
1310                 }
1311         } else {
1312                 /* "Snapshot output "name" successfully deleted
1313                  * for session "current_session_name"
1314                  * Name of the output
1315                  */
1316                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1317                                 name);
1318                 if (ret) {
1319                         goto end;
1320                 }
1321         }
1322
1323         /* Snapshot was deleted for session "current_session_name"*/
1324         ret = mi_lttng_writer_write_element_string(writer,
1325                         mi_lttng_element_snapshot_session_name,
1326                         current_session_name);
1327         if (ret) {
1328                 goto end;
1329         }
1330
1331         /* Close snapshot element */
1332         ret = mi_lttng_writer_close_element(writer);
1333
1334 end:
1335         return ret;
1336 }
1337
1338 LTTNG_HIDDEN
1339 int mi_lttng_snapshot_add_output(struct mi_writer *writer,
1340                 const char *current_session_name, const char *n_ptr,
1341                 struct lttng_snapshot_output *output)
1342 {
1343         int ret;
1344
1345         /* Open element snapshot */
1346         ret = mi_lttng_writer_open_element(writer,
1347                         mi_lttng_element_command_snapshot);
1348         if (ret) {
1349                 goto end;
1350         }
1351
1352         /* Snapshot output id */
1353         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1354                         mi_lttng_element_id, output->id);
1355         if (ret) {
1356                 goto end;
1357         }
1358
1359         /* Snapshot output names */
1360         ret = mi_lttng_writer_write_element_string(writer,
1361                         config_element_name, n_ptr);
1362         if (ret) {
1363                 goto end;
1364         }
1365
1366         /* Destination of the output (ctrl_url)*/
1367         ret = mi_lttng_writer_write_element_string(writer,
1368                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1369         if (ret) {
1370                 goto end;
1371         }
1372
1373         /* Snapshot added for session "current_session_name"*/
1374         ret = mi_lttng_writer_write_element_string(writer,
1375                         mi_lttng_element_snapshot_session_name, current_session_name);
1376         if (ret) {
1377                 goto end;
1378         }
1379
1380         /* total size of all stream combined */
1381         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1382                         mi_lttng_element_snapshot_max_size, output->max_size);
1383         if (ret) {
1384                 goto end;
1385         }
1386
1387         /* Close snapshot element */
1388         ret = mi_lttng_writer_close_element(writer);
1389
1390 end:
1391         return ret;
1392 }
1393
1394 LTTNG_HIDDEN
1395 int mi_lttng_snapshot_record(struct mi_writer *writer,
1396                 const char *current_session_name, const char *url,
1397                 const char *cmdline_ctrl_url, const char *cmdline_data_url)
1398 {
1399         int ret;
1400
1401         /* Open element snapshot */
1402         ret = mi_lttng_writer_open_element(writer,
1403                         mi_lttng_element_command_snapshot);
1404         if (ret) {
1405                 goto end;
1406         }
1407
1408         /*
1409          * If a valid an URL was given, serialize it,
1410          * else take the command line data and ctrl urls*/
1411         if (url) {
1412                 /* Destination of the output (ctrl_url)*/
1413                 ret = mi_lttng_writer_write_element_string(writer,
1414                                 mi_lttng_element_snapshot_ctrl_url, url);
1415                 if (ret) {
1416                         goto end;
1417                 }
1418         } else if (cmdline_ctrl_url) {
1419                 /* Destination of the output (ctrl_url)*/
1420                 ret = mi_lttng_writer_write_element_string(writer,
1421                                 mi_lttng_element_snapshot_ctrl_url, cmdline_ctrl_url);
1422                 if (ret) {
1423                         goto end;
1424                 }
1425
1426                 /* Destination of the output (data_url) */
1427                 ret = mi_lttng_writer_write_element_string(writer,
1428                                 mi_lttng_element_snapshot_data_url, cmdline_data_url);
1429                 if (ret) {
1430                         goto end;
1431                 }
1432         }
1433
1434         /* Close record_snapshot element */
1435         ret = mi_lttng_writer_close_element(writer);
1436
1437 end:
1438         return ret;
1439 }