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 LOG4J */
 129 const char * const mi_lttng_loglevel_str_log4j_off = "LOG4J_OFF";
 130 const char * const mi_lttng_loglevel_str_log4j_fatal = "LOG4J_FATAL";
 131 const char * const mi_lttng_loglevel_str_log4j_error = "LOG4J_ERROR";
 132 const char * const mi_lttng_loglevel_str_log4j_warn = "LOG4J_WARN";
 133 const char * const mi_lttng_loglevel_str_log4j_info = "LOG4J_INFO";
 134 const char * const mi_lttng_loglevel_str_log4j_debug = "LOG4J_DEBUG";
 135 const char * const mi_lttng_loglevel_str_log4j_trace = "LOG4J_TRACE";
 136 const char * const mi_lttng_loglevel_str_log4j_all = "LOG4J_ALL";
 137
 138 /* String related to loglevel Python */
 139 const char * const mi_lttng_loglevel_str_python_critical = "PYTHON_CRITICAL";
 140 const char * const mi_lttng_loglevel_str_python_error = "PYTHON_ERROR";
 141 const char * const mi_lttng_loglevel_str_python_warning = "PYTHON_WARNING";
 142 const char * const mi_lttng_loglevel_str_python_info = "PYTHON_INFO";
 143 const char * const mi_lttng_loglevel_str_python_debug = "PYTHON_DEBUG";
 144 const char * const mi_lttng_loglevel_str_python_notset = "PYTHON_NOTSET";
 145
 146 /* String related to loglevel type */
 147 const char * const mi_lttng_loglevel_type_all = "ALL";
 148 const char * const mi_lttng_loglevel_type_range = "RANGE";
 149 const char * const mi_lttng_loglevel_type_single = "SINGLE";
 150 const char * const mi_lttng_loglevel_type_unknown = "UNKNOWN";
 151
 152 /* String related to lttng_calibrate */
 153 const char * const mi_lttng_element_calibrate = "calibrate";
 154 const char * const mi_lttng_element_calibrate_function = "FUNCTION";
 155
 156 /* String related to a lttng_snapshot_output */
 157 const char * const mi_lttng_element_snapshot_ctrl_url = "ctrl_url";
 158 const char * const mi_lttng_element_snapshot_data_url = "data_url";
 159 const char * const mi_lttng_element_snapshot_max_size = "max_size";
 160 const char * const mi_lttng_element_snapshot_n_ptr = "n_ptr";
 161 const char * const mi_lttng_element_snapshot_session_name = "session_name";
 162 const char * const mi_lttng_element_snapshots = "snapshots";
 163
 164 /* This is a merge of jul loglevel and regular loglevel
 165  * Those should never overlap by definition
 166  * (see struct lttng_event loglevel)
 167  */
 168 LTTNG_HIDDEN
 169 const char *mi_lttng_loglevel_string(int value, enum lttng_domain_type domain)
 170 {
 171         switch (domain) {
 172         case LTTNG_DOMAIN_KERNEL:
 173         case LTTNG_DOMAIN_UST:
 174                 switch (value) {
 175                 case -1:
 176                         return mi_lttng_element_empty;
 177                 case LTTNG_LOGLEVEL_EMERG:
 178                         return mi_lttng_loglevel_str_emerg;
 179                 case LTTNG_LOGLEVEL_ALERT:
 180                         return mi_lttng_loglevel_str_alert;
 181                 case LTTNG_LOGLEVEL_CRIT:
 182                         return mi_lttng_loglevel_str_crit;
 183                 case LTTNG_LOGLEVEL_ERR:
 184                         return mi_lttng_loglevel_str_err;
 185                 case LTTNG_LOGLEVEL_WARNING:
 186                         return mi_lttng_loglevel_str_warning;
 187                 case LTTNG_LOGLEVEL_NOTICE:
 188                         return mi_lttng_loglevel_str_notice;
 189                 case LTTNG_LOGLEVEL_INFO:
 190                         return mi_lttng_loglevel_str_info;
 191                 case LTTNG_LOGLEVEL_DEBUG_SYSTEM:
 192                         return mi_lttng_loglevel_str_debug_system;
 193                 case LTTNG_LOGLEVEL_DEBUG_PROGRAM:
 194                         return mi_lttng_loglevel_str_debug_program;
 195                 case LTTNG_LOGLEVEL_DEBUG_PROCESS:
 196                         return mi_lttng_loglevel_str_debug_process;
 197                 case LTTNG_LOGLEVEL_DEBUG_MODULE:
 198                         return mi_lttng_loglevel_str_debug_module;
 199                 case LTTNG_LOGLEVEL_DEBUG_UNIT:
 200                         return mi_lttng_loglevel_str_debug_unit;
 201                 case LTTNG_LOGLEVEL_DEBUG_FUNCTION:
 202                         return mi_lttng_loglevel_str_debug_function;
 203                 case LTTNG_LOGLEVEL_DEBUG_LINE:
 204                         return mi_lttng_loglevel_str_debug_line;
 205                 case LTTNG_LOGLEVEL_DEBUG:
 206                         return mi_lttng_loglevel_str_debug;
 207                 default:
 208                         return mi_lttng_loglevel_str_unknown;
 209                 }
 210                 break;
 211         case LTTNG_DOMAIN_LOG4J:
 212                 switch (value) {
 213                 case -1:
 214                         return mi_lttng_element_empty;
 215                 case LTTNG_LOGLEVEL_LOG4J_OFF:
 216                         return mi_lttng_loglevel_str_log4j_off;
 217                 case LTTNG_LOGLEVEL_LOG4J_FATAL:
 218                         return mi_lttng_loglevel_str_log4j_fatal;
 219                 case LTTNG_LOGLEVEL_LOG4J_ERROR:
 220                         return mi_lttng_loglevel_str_log4j_error;
 221                 case LTTNG_LOGLEVEL_LOG4J_WARN:
 222                         return mi_lttng_loglevel_str_log4j_warn;
 223                 case LTTNG_LOGLEVEL_LOG4J_INFO:
 224                         return mi_lttng_loglevel_str_log4j_info;
 225                 case LTTNG_LOGLEVEL_LOG4J_DEBUG:
 226                         return mi_lttng_loglevel_str_log4j_debug;
 227                 case LTTNG_LOGLEVEL_LOG4J_TRACE:
 228                         return mi_lttng_loglevel_str_log4j_trace;
 229                 case LTTNG_LOGLEVEL_LOG4J_ALL:
 230                         return mi_lttng_loglevel_str_log4j_all;
 231                 default:
 232                         return mi_lttng_loglevel_str_unknown;
 233                 }
 234                 break;
 235         case LTTNG_DOMAIN_JUL:
 236                 switch (value) {
 237                 case -1:
 238                         return mi_lttng_element_empty;
 239                 case LTTNG_LOGLEVEL_JUL_OFF:
 240                         return mi_lttng_loglevel_str_jul_off;
 241                 case LTTNG_LOGLEVEL_JUL_SEVERE:
 242                         return mi_lttng_loglevel_str_jul_severe;
 243                 case LTTNG_LOGLEVEL_JUL_WARNING:
 244                         return mi_lttng_loglevel_str_jul_warning;
 245                 case LTTNG_LOGLEVEL_JUL_INFO:
 246                         return mi_lttng_loglevel_str_jul_info;
 247                 case LTTNG_LOGLEVEL_JUL_CONFIG:
 248                         return mi_lttng_loglevel_str_jul_config;
 249                 case LTTNG_LOGLEVEL_JUL_FINE:
 250                         return mi_lttng_loglevel_str_jul_fine;
 251                 case LTTNG_LOGLEVEL_JUL_FINER:
 252                         return mi_lttng_loglevel_str_jul_finer;
 253                 case LTTNG_LOGLEVEL_JUL_FINEST:
 254                         return mi_lttng_loglevel_str_jul_finest;
 255                 case LTTNG_LOGLEVEL_JUL_ALL:
 256                         return mi_lttng_loglevel_str_jul_all;
 257                 default:
 258                         return mi_lttng_loglevel_str_unknown;
 259                 }
 260                 break;
 261         case LTTNG_DOMAIN_PYTHON:
 262                 switch (value) {
 263                 case LTTNG_LOGLEVEL_PYTHON_CRITICAL:
 264                         return mi_lttng_loglevel_str_python_critical;
 265                 case LTTNG_LOGLEVEL_PYTHON_ERROR:
 266                         return mi_lttng_loglevel_str_python_error;
 267                 case LTTNG_LOGLEVEL_PYTHON_WARNING:
 268                         return mi_lttng_loglevel_str_python_warning;
 269                 case LTTNG_LOGLEVEL_PYTHON_INFO:
 270                         return mi_lttng_loglevel_str_python_info;
 271                 case LTTNG_LOGLEVEL_PYTHON_DEBUG:
 272                         return mi_lttng_loglevel_str_python_debug;
 273                 case LTTNG_LOGLEVEL_PYTHON_NOTSET:
 274                         return mi_lttng_loglevel_str_python_notset;
 275                 default:
 276                         return mi_lttng_loglevel_str_unknown;
 277                 }
 278                 break;
 279         }
 280
 281         /* Reaching this means the domain is unknown. */
 282         return mi_lttng_loglevel_str_unknown;
 283 }
 284
 285 LTTNG_HIDDEN
 286 const char *mi_lttng_logleveltype_string(enum lttng_loglevel_type value)
 287 {
 288         switch (value) {
 289         case LTTNG_EVENT_LOGLEVEL_ALL:
 290                 return mi_lttng_loglevel_type_all;
 291         case LTTNG_EVENT_LOGLEVEL_RANGE:
 292                 return mi_lttng_loglevel_type_range;
 293         case LTTNG_EVENT_LOGLEVEL_SINGLE:
 294                 return mi_lttng_loglevel_type_single;
 295         default:
 296                 return mi_lttng_loglevel_type_unknown;
 297         }
 298 }
 299
 300 LTTNG_HIDDEN
 301 const char *mi_lttng_eventtype_string(enum lttng_event_type value)
 302 {
 303         switch (value) {
 304         case LTTNG_EVENT_ALL:
 305                 return config_event_type_all;
 306         case LTTNG_EVENT_TRACEPOINT:
 307                 return config_event_type_tracepoint;
 308         case LTTNG_EVENT_PROBE:
 309                 return config_event_type_probe;
 310         case LTTNG_EVENT_FUNCTION:
 311                 return config_event_type_function;
 312         case LTTNG_EVENT_FUNCTION_ENTRY:
 313                 return config_event_type_function_entry;
 314         case LTTNG_EVENT_SYSCALL:
 315                 return config_event_type_syscall;
 316         case LTTNG_EVENT_NOOP:
 317                 return config_event_type_noop;
 318         default:
 319                 return mi_lttng_element_empty;
 320         }
 321 }
 322
 323 LTTNG_HIDDEN
 324 const char *mi_lttng_event_contexttype_string(enum lttng_event_context_type val)
 325 {
 326         switch (val) {
 327         case LTTNG_EVENT_CONTEXT_PID:
 328                 return config_event_context_pid;
 329         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
 330                 return mi_lttng_context_type_perf_counter;
 331         case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
 332                 return mi_lttng_context_type_perf_thread_counter;
 333         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
 334                 return mi_lttng_context_type_perf_cpu_counter;
 335         case LTTNG_EVENT_CONTEXT_PROCNAME:
 336                 return config_event_context_procname;
 337         case LTTNG_EVENT_CONTEXT_PRIO:
 338                 return config_event_context_prio;
 339         case LTTNG_EVENT_CONTEXT_NICE:
 340                 return config_event_context_nice;
 341         case LTTNG_EVENT_CONTEXT_VPID:
 342                 return config_event_context_vpid;
 343         case LTTNG_EVENT_CONTEXT_TID:
 344                 return config_event_context_tid;
 345         case LTTNG_EVENT_CONTEXT_VTID:
 346                 return config_event_context_vtid;
 347         case LTTNG_EVENT_CONTEXT_PPID:
 348                 return config_event_context_ppid;
 349         case LTTNG_EVENT_CONTEXT_VPPID:
 350                 return config_event_context_vppid;
 351         case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
 352                 return config_event_context_pthread_id;
 353         case LTTNG_EVENT_CONTEXT_HOSTNAME:
 354                 return config_event_context_hostname;
 355         case LTTNG_EVENT_CONTEXT_IP:
 356                 return config_event_context_ip;
 357         default:
 358                 return NULL;
 359         }
 360 }
 361
 362 LTTNG_HIDDEN
 363 const char *mi_lttng_eventfieldtype_string(enum lttng_event_field_type val)
 364 {
 365         switch (val) {
 366         case(LTTNG_EVENT_FIELD_INTEGER):
 367                 return mi_lttng_element_type_integer;
 368         case(LTTNG_EVENT_FIELD_ENUM):
 369                 return mi_lttng_element_type_enum;
 370         case(LTTNG_EVENT_FIELD_FLOAT):
 371                 return mi_lttng_element_type_float;
 372         case(LTTNG_EVENT_FIELD_STRING):
 373                 return mi_lttng_element_type_string;
 374         default:
 375                 return mi_lttng_element_type_other;
 376         }
 377 }
 378
 379 LTTNG_HIDDEN
 380 const char *mi_lttng_domaintype_string(enum lttng_domain_type value)
 381 {
 382         /* Note: This is a *duplicate* of get_domain_str from bin/lttng/utils.c */
 383         switch (value) {
 384         case LTTNG_DOMAIN_KERNEL:
 385                 return config_domain_type_kernel;
 386         case LTTNG_DOMAIN_UST:
 387                 return config_domain_type_ust;
 388         case LTTNG_DOMAIN_JUL:
 389                 return config_domain_type_jul;
 390         case LTTNG_DOMAIN_LOG4J:
 391                 return config_domain_type_log4j;
 392         default:
 393                 /* Should not have an unknown domain */
 394                 assert(0);
 395         }
 396 }
 397
 398 LTTNG_HIDDEN
 399 const char *mi_lttng_buffertype_string(enum lttng_buffer_type value)
 400 {
 401         switch (value) {
 402         case LTTNG_BUFFER_PER_PID:
 403                 return config_buffer_type_per_pid;
 404         case LTTNG_BUFFER_PER_UID:
 405                 return config_buffer_type_per_uid;
 406         case LTTNG_BUFFER_GLOBAL:
 407                 return config_buffer_type_global;
 408         default:
 409                 /* Should not have an unknow buffer type */
 410                 assert(0);
 411         }
 412 }
 413
 414 LTTNG_HIDDEN
 415 const char *mi_lttng_calibratetype_string(enum lttng_calibrate_type val)
 416 {
 417         const char *ret;
 418
 419         switch (val) {
 420         case LTTNG_CALIBRATE_FUNCTION:
 421                 ret = mi_lttng_element_calibrate_function;
 422                 break;
 423         default:
 424                 ret = mi_lttng_element_empty;
 425                 break;
 426         }
 427         return ret;
 428 }
 429
 430 LTTNG_HIDDEN
 431 struct mi_writer *mi_lttng_writer_create(int fd_output, int mi_output_type)
 432 {
 433         struct mi_writer *mi_writer;
 434
 435         mi_writer = zmalloc(sizeof(struct mi_writer));
 436         if (!mi_writer) {
 437                 PERROR("zmalloc mi_writer_create");
 438                 goto end;
 439         }
 440         if (mi_output_type == LTTNG_MI_XML) {
 441                 mi_writer->writer = config_writer_create(fd_output, 0);
 442                 if (!mi_writer->writer) {
 443                         goto err_destroy;
 444                 }
 445                 mi_writer->type = LTTNG_MI_XML;
 446         } else {
 447                 goto err_destroy;
 448         }
 449
 450 end:
 451         return mi_writer;
 452
 453 err_destroy:
 454         free(mi_writer);
 455         return NULL;
 456 }
 457
 458 LTTNG_HIDDEN
 459 int mi_lttng_writer_destroy(struct mi_writer *writer)
 460 {
 461         int ret;
 462
 463         if (!writer) {
 464                 ret = -EINVAL;
 465                 goto end;
 466         }
 467
 468         ret = config_writer_destroy(writer->writer);
 469         if (ret < 0) {
 470                 goto end;
 471         }
 472
 473         free(writer);
 474 end:
 475         return ret;
 476 }
 477
 478 LTTNG_HIDDEN
 479 int mi_lttng_writer_command_open(struct mi_writer *writer, const char *command)
 480 {
 481         int ret;
 482
 483         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_command);
 484         if (ret) {
 485                 goto end;
 486         }
 487         ret = mi_lttng_writer_write_element_string(writer,
 488                         mi_lttng_element_command_name, command);
 489 end:
 490         return ret;
 491 }
 492
 493 LTTNG_HIDDEN
 494 int mi_lttng_writer_command_close(struct mi_writer *writer)
 495 {
 496         return mi_lttng_writer_close_element(writer);
 497 }
 498
 499 LTTNG_HIDDEN
 500 int mi_lttng_writer_open_element(struct mi_writer *writer,
 501                 const char *element_name)
 502 {
 503         return config_writer_open_element(writer->writer, element_name);
 504 }
 505
 506 LTTNG_HIDDEN
 507 int mi_lttng_writer_close_element(struct mi_writer *writer)
 508 {
 509         return config_writer_close_element(writer->writer);
 510 }
 511
 512 LTTNG_HIDDEN
 513 int mi_lttng_close_multi_element(struct mi_writer *writer,
 514                 unsigned int nb_element)
 515 {
 516         int ret, i;
 517
 518         if (nb_element < 1) {
 519                 ret = 0;
 520                 goto end;
 521         }
 522         for (i = 0; i < nb_element; i++) {
 523                 ret = mi_lttng_writer_close_element(writer);
 524                 if (ret) {
 525                         goto end;
 526                 }
 527         }
 528 end:
 529         return ret;
 530 }
 531
 532 LTTNG_HIDDEN
 533 int mi_lttng_writer_write_element_unsigned_int(struct mi_writer *writer,
 534                 const char *element_name, uint64_t value)
 535 {
 536         return config_writer_write_element_unsigned_int(writer->writer,
 537                         element_name, value);
 538 }
 539
 540 LTTNG_HIDDEN
 541 int mi_lttng_writer_write_element_signed_int(struct mi_writer *writer,
 542                 const char *element_name, int64_t value)
 543 {
 544         return config_writer_write_element_signed_int(writer->writer,
 545                         element_name, value);
 546 }
 547
 548 LTTNG_HIDDEN
 549 int mi_lttng_writer_write_element_bool(struct mi_writer *writer,
 550                 const char *element_name, int value)
 551 {
 552         return config_writer_write_element_bool(writer->writer,
 553                         element_name, value);
 554 }
 555
 556 LTTNG_HIDDEN
 557 int mi_lttng_writer_write_element_string(struct mi_writer *writer,
 558                 const char *element_name, const char *value)
 559 {
 560         return config_writer_write_element_string(writer->writer,
 561                         element_name, value);
 562 }
 563
 564 LTTNG_HIDDEN
 565 int mi_lttng_version(struct mi_writer *writer, struct mi_lttng_version *version,
 566         const char *lttng_description, const char *lttng_license)
 567 {
 568         int ret;
 569
 570         /* Open version */
 571         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_version);
 572         if (ret) {
 573                 goto end;
 574         }
 575
 576         /* Version string (contain info like rc etc.) */
 577         ret = mi_lttng_writer_write_element_string(writer,
 578                         mi_lttng_element_version_str, version->version);
 579         if (ret) {
 580                 goto end;
 581         }
 582
 583         /* Major version number */
 584         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 585                         mi_lttng_element_version_major, version->version_major);
 586         if (ret) {
 587                 goto end;
 588         }
 589
 590         /* Minor version number */
 591         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 592                         mi_lttng_element_version_minor, version->version_minor);
 593         if (ret) {
 594                 goto end;
 595         }
 596
 597         /* Commit version number */
 598         ret = mi_lttng_writer_write_element_string(writer,
 599                         mi_lttng_element_version_commit, version->version_commit);
 600         if (ret) {
 601                 goto end;
 602         }
 603
 604         /* Patch number */
 605         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 606                         mi_lttng_element_version_patch_level, version->version_patchlevel);
 607         if (ret) {
 608                 goto end;
 609         }
 610
 611         /* Name of the version */
 612         ret = mi_lttng_writer_write_element_string(writer,
 613                         config_element_name, version->version_name);
 614         if (ret) {
 615                 goto end;
 616         }
 617
 618         /* Description mostly related to beer... */
 619         ret = mi_lttng_writer_write_element_string(writer,
 620                         mi_lttng_element_version_description, lttng_description);
 621         if (ret) {
 622                 goto end;
 623         }
 624
 625         /* url */
 626         ret = mi_lttng_writer_write_element_string(writer,
 627                         mi_lttng_element_version_web, version->package_url);
 628         if (ret) {
 629                 goto end;
 630         }
 631
 632         /* License: free as in free beer...no...*speech* */
 633         ret = mi_lttng_writer_write_element_string(writer,
 634                         mi_lttng_element_version_license, lttng_license);
 635         if (ret) {
 636                 goto end;
 637         }
 638
 639         /* Close version element */
 640         ret = mi_lttng_writer_close_element(writer);
 641
 642 end:
 643         return ret;
 644 }
 645
 646 LTTNG_HIDDEN
 647 int mi_lttng_sessions_open(struct mi_writer *writer)
 648 {
 649         return mi_lttng_writer_open_element(writer, config_element_sessions);
 650 }
 651
 652 LTTNG_HIDDEN
 653 int mi_lttng_session(struct mi_writer *writer,
 654                 struct lttng_session *session, int is_open)
 655 {
 656         int ret;
 657
 658         assert(session);
 659
 660         /* Open sessions element */
 661         ret = mi_lttng_writer_open_element(writer,
 662                         config_element_session);
 663         if (ret) {
 664                 goto end;
 665         }
 666
 667         /* Name of the session */
 668         ret = mi_lttng_writer_write_element_string(writer,
 669                         config_element_name, session->name);
 670         if (ret) {
 671                 goto end;
 672         }
 673
 674         /* Path */
 675         ret = mi_lttng_writer_write_element_string(writer,
 676                         config_element_path, session->path);
 677         if (ret) {
 678                 goto end;
 679         }
 680
 681         /* Enabled ? */
 682         ret = mi_lttng_writer_write_element_bool(writer,
 683                         config_element_enabled, session->enabled);
 684         if (ret) {
 685                 goto end;
 686         }
 687
 688         /* Snapshot mode */
 689         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 690                         config_element_snapshot_mode, session->snapshot_mode);
 691         if (ret) {
 692                 goto end;
 693         }
 694
 695         /* Live timer interval in usec */
 696         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 697                         config_element_live_timer_interval,
 698                         session->live_timer_interval);
 699         if (ret) {
 700                 goto end;
 701         }
 702
 703         if (!is_open) {
 704                 /* Closing session element */
 705                 ret = mi_lttng_writer_close_element(writer);
 706         }
 707 end:
 708         return ret;
 709
 710 }
 711
 712 LTTNG_HIDDEN
 713 int mi_lttng_domains_open(struct mi_writer *writer)
 714 {
 715         return mi_lttng_writer_open_element(writer, config_element_domains);
 716 }
 717
 718 LTTNG_HIDDEN
 719 int mi_lttng_domain(struct mi_writer *writer,
 720                 struct lttng_domain *domain, int is_open)
 721 {
 722         int ret = 0;
 723         const char *str_domain;
 724         const char *str_buffer;
 725
 726         assert(domain);
 727
 728         /* Open domain element */
 729         ret = mi_lttng_writer_open_element(writer, config_element_domain);
 730         if (ret) {
 731                 goto end;
 732         }
 733
 734         /* Domain Type */
 735         str_domain = mi_lttng_domaintype_string(domain->type);
 736         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
 737                         str_domain);
 738         if (ret) {
 739                 goto end;
 740         }
 741
 742         /* Buffer Type */
 743         str_buffer= mi_lttng_buffertype_string(domain->buf_type);
 744         ret = mi_lttng_writer_write_element_string(writer,
 745                         config_element_buffer_type, str_buffer);
 746         if (ret) {
 747                 goto end;
 748         }
 749
 750         /* TODO: union  attr
 751          * This union is not currently used and was added for
 752          * future ust domain support.
 753          * Date: 25-06-2014
 754          * */
 755
 756         if (!is_open) {
 757                 /* Closing domain element */
 758                 ret = mi_lttng_writer_close_element(writer);
 759         }
 760
 761 end:
 762         return ret;
 763
 764 }
 765
 766 LTTNG_HIDDEN
 767 int mi_lttng_channels_open(struct mi_writer *writer)
 768 {
 769         return mi_lttng_writer_open_element(writer, config_element_channels);
 770 }
 771
 772 LTTNG_HIDDEN
 773 int mi_lttng_channel(struct mi_writer *writer,
 774                 struct lttng_channel *channel, int is_open)
 775 {
 776         int ret = 0;
 777
 778         assert(channel);
 779
 780         /* Opening channel element */
 781         ret = mi_lttng_writer_open_element(writer, config_element_channel);
 782         if (ret) {
 783                 goto end;
 784         }
 785
 786         /* Name */
 787         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
 788                         channel->name);
 789         if (ret) {
 790                 goto end;
 791         }
 792
 793         /* Enabled ? */
 794         ret = mi_lttng_writer_write_element_bool(writer,
 795                         config_element_enabled, channel->enabled);
 796         if (ret) {
 797                 goto end;
 798         }
 799
 800         /* Attribute */
 801         ret = mi_lttng_channel_attr(writer, &channel->attr);
 802         if (ret) {
 803                 goto end;
 804         }
 805
 806         if (!is_open) {
 807                 /* Closing channel element */
 808                 ret = mi_lttng_writer_close_element(writer);
 809                 if (ret) {
 810                         goto end;
 811                 }
 812         }
 813 end:
 814         return ret;
 815 }
 816
 817 LTTNG_HIDDEN
 818 int mi_lttng_channel_attr(struct mi_writer *writer,
 819                 struct lttng_channel_attr *attr)
 820 {
 821         int ret = 0;
 822
 823         assert(attr);
 824
 825         /* Opening Attributes */
 826         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
 827         if (ret) {
 828                 goto end;
 829         }
 830
 831         /* Overwrite */
 832         ret = mi_lttng_writer_write_element_string(writer,
 833                 config_element_overwrite_mode,
 834                 attr->overwrite ? config_overwrite_mode_overwrite :
 835                         config_overwrite_mode_discard);
 836         if (ret) {
 837                 goto end;
 838         }
 839
 840         /* Sub buffer size in byte */
 841         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 842                 config_element_subbuf_size, attr->subbuf_size);
 843         if (ret) {
 844                 goto end;
 845         }
 846
 847         /* Number of subbuffer (power of two) */
 848         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 849                 config_element_num_subbuf,
 850                 attr->num_subbuf);
 851         if (ret) {
 852                 goto end;
 853         }
 854
 855         /* Switch timer interval in usec */
 856         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 857                 config_element_switch_timer_interval,
 858                 attr->switch_timer_interval);
 859         if (ret) {
 860                 goto end;
 861         }
 862
 863         /* Read timer interval in usec */
 864         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 865                 config_element_read_timer_interval,
 866                 attr->read_timer_interval);
 867         if (ret) {
 868                 goto end;
 869         }
 870
 871         /* Event output */
 872         ret = mi_lttng_writer_write_element_string(writer,
 873                 config_element_output_type,
 874                 attr->output == LTTNG_EVENT_SPLICE ?
 875                 config_output_type_splice : config_output_type_mmap);
 876         if (ret) {
 877                 goto end;
 878         }
 879
 880         /* Tracefile size in bytes */
 881         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 882                 config_element_tracefile_size, attr->tracefile_size);
 883         if (ret) {
 884                 goto end;
 885         }
 886
 887         /* Count of tracefiles */
 888         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 889                 config_element_tracefile_count,
 890                 attr->tracefile_count);
 891         if (ret) {
 892                 goto end;
 893         }
 894
 895         /* Live timer interval in usec*/
 896         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 897                 config_element_live_timer_interval,
 898                 attr->live_timer_interval);
 899         if (ret) {
 900                 goto end;
 901         }
 902
 903         /* Closing attributes */
 904         ret = mi_lttng_writer_close_element(writer);
 905         if (ret) {
 906                 goto end;
 907         }
 908 end:
 909         return ret;
 910
 911 }
 912
 913 LTTNG_HIDDEN
 914 int mi_lttng_event_common_attributes(struct mi_writer *writer,
 915                 struct lttng_event *event)
 916 {
 917         int ret;
 918
 919         /* Open event element */
 920         ret = mi_lttng_writer_open_element(writer, config_element_event);
 921         if (ret) {
 922                 goto end;
 923         }
 924
 925         /* Event name */
 926         ret = mi_lttng_writer_write_element_string(writer,
 927                         config_element_name, event->name);
 928         if (ret) {
 929                 goto end;
 930         }
 931
 932         /* Event type */
 933         ret = mi_lttng_writer_write_element_string(writer,
 934                         config_element_type, mi_lttng_eventtype_string(event->type));
 935         if (ret) {
 936                 goto end;
 937         }
 938
 939         /* Is event enabled */
 940         ret = mi_lttng_writer_write_element_bool(writer,
 941                         config_element_enabled, event->enabled);
 942         if (ret) {
 943                 goto end;
 944         }
 945
 946         /* Event filter enabled? */
 947         ret = mi_lttng_writer_write_element_bool(writer,
 948                         config_element_filter, event->filter);
 949
 950 end:
 951         return ret;
 952 }
 953
 954 LTTNG_HIDDEN
 955 int mi_lttng_event_tracepoint_loglevel(struct mi_writer *writer,
 956                 struct lttng_event *event, enum lttng_domain_type domain)
 957 {
 958         int ret;
 959
 960         /* Event loglevel */
 961         ret = mi_lttng_writer_write_element_string(writer,
 962                         config_element_loglevel,
 963                         mi_lttng_loglevel_string(event->loglevel, domain));
 964         if (ret) {
 965                 goto end;
 966         }
 967
 968         /* Log level type */
 969         ret = mi_lttng_writer_write_element_string(writer,
 970                         config_element_loglevel_type,
 971                         mi_lttng_logleveltype_string(event->loglevel_type));
 972         if (ret) {
 973                 goto end;
 974         }
 975
 976         /* event exclusion filter */
 977         ret = mi_lttng_writer_write_element_bool(writer,
 978                         config_element_exclusion, event->exclusion);
 979         if (ret) {
 980                 goto end;
 981         }
 982
 983 end:
 984         return ret;
 985 }
 986
 987 LTTNG_HIDDEN
 988 int mi_lttng_event_tracepoint_no_loglevel(struct mi_writer *writer,
 989                 struct lttng_event *event)
 990 {
 991         /* event exclusion filter */
 992         return mi_lttng_writer_write_element_bool(writer,
 993                         config_element_exclusion, event->exclusion);
 994 }
 995
 996 LTTNG_HIDDEN
 997 int mi_lttng_event_function_probe(struct mi_writer *writer,
 998                 struct lttng_event *event)
 999 {
1000         int ret;
1001
1002         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1003         if (ret) {
1004                 goto end;
1005         }
1006
1007         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1008         if (ret) {
1009                 goto end;
1010         }
1011
1012         if (event->attr.probe.addr != 0) {
1013                 /* event probe address */
1014                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1015                                 config_element_address, event->attr.probe.addr);
1016                 if (ret) {
1017                         goto end;
1018                 }
1019         } else {
1020                 /* event probe offset */
1021                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1022                                 config_element_offset, event->attr.probe.offset);
1023                 if (ret) {
1024                         goto end;
1025                 }
1026
1027                 /* event probe symbol_name */
1028                 ret = mi_lttng_writer_write_element_string(writer,
1029                                 config_element_symbol_name, event->attr.probe.symbol_name);
1030                 if (ret) {
1031                         goto end;
1032                 }
1033         }
1034
1035         /* Close probe_attributes and attributes */
1036         ret = mi_lttng_close_multi_element(writer, 2);
1037 end:
1038         return ret;
1039 }
1040
1041 LTTNG_HIDDEN
1042 int mi_lttng_event_function_entry(struct mi_writer *writer,
1043                 struct lttng_event *event)
1044 {
1045         int ret;
1046
1047         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1048         if (ret) {
1049                 goto end;
1050         }
1051
1052         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1053         if (ret) {
1054                 goto end;
1055         }
1056
1057         /* event probe symbol_name */
1058         ret = mi_lttng_writer_write_element_string(writer,
1059                         config_element_symbol_name, event->attr.ftrace.symbol_name);
1060         if (ret) {
1061                 goto end;
1062         }
1063
1064         /* Close function_attributes and attributes */
1065         ret = mi_lttng_close_multi_element(writer, 2);
1066 end:
1067         return ret;
1068 }
1069
1070 LTTNG_HIDDEN
1071 int mi_lttng_events_open(struct mi_writer *writer)
1072 {
1073         return mi_lttng_writer_open_element(writer, config_element_events);
1074 }
1075
1076 LTTNG_HIDDEN
1077 int mi_lttng_event(struct mi_writer *writer,
1078                 struct lttng_event *event, int is_open, enum lttng_domain_type domain)
1079 {
1080         int ret;
1081
1082         ret = mi_lttng_event_common_attributes(writer, event);
1083         if (ret) {
1084                 goto end;
1085         }
1086
1087         switch (event->type) {
1088         case LTTNG_EVENT_TRACEPOINT:
1089         {
1090                 if (event->loglevel != -1) {
1091                         ret = mi_lttng_event_tracepoint_loglevel(writer, event, domain);
1092                 } else {
1093                         ret = mi_lttng_event_tracepoint_no_loglevel(writer, event);
1094                 }
1095                 break;
1096         }
1097         case LTTNG_EVENT_FUNCTION:
1098                 /* Fallthrough */
1099         case LTTNG_EVENT_PROBE:
1100                 ret = mi_lttng_event_function_probe(writer, event);
1101                 break;
1102         case LTTNG_EVENT_FUNCTION_ENTRY:
1103                 ret = mi_lttng_event_function_entry(writer, event);
1104                 break;
1105         case LTTNG_EVENT_ALL:
1106                 /* Fallthrough */
1107         default:
1108                 break;
1109         }
1110
1111         if (!is_open) {
1112                 ret = mi_lttng_writer_close_element(writer);
1113         }
1114
1115 end:
1116         return ret;
1117 }
1118
1119 LTTNG_HIDDEN
1120 int mi_lttng_pids_open(struct mi_writer *writer)
1121 {
1122         return mi_lttng_writer_open_element(writer, mi_lttng_element_pids);
1123 }
1124
1125 LTTNG_HIDDEN
1126 int mi_lttng_pid(struct mi_writer *writer, pid_t pid , const char *cmdline,
1127                 int is_open)
1128 {
1129         int ret;
1130
1131         /* Open element pid */
1132         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_pid);
1133         if (ret) {
1134                 goto end;
1135         }
1136
1137         /* Writing pid number */
1138         ret = mi_lttng_writer_write_element_signed_int(writer,
1139                         mi_lttng_element_pid_id, (int)pid);
1140         if (ret) {
1141                 goto end;
1142         }
1143
1144         /* Writing name of the process */
1145         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1146                         cmdline);
1147         if (ret) {
1148                 goto end;
1149         }
1150
1151         if (!is_open) {
1152                 /* Closing Pid */
1153                 ret = mi_lttng_writer_close_element(writer);
1154         }
1155
1156 end:
1157         return ret;
1158 }
1159
1160 LTTNG_HIDDEN
1161 int mi_lttng_event_fields_open(struct mi_writer *writer)
1162 {
1163         return mi_lttng_writer_open_element(writer, mi_lttng_element_event_fields);
1164 }
1165
1166 LTTNG_HIDDEN
1167 int mi_lttng_event_field(struct mi_writer *writer,
1168                 struct lttng_event_field *field)
1169 {
1170         int ret;
1171
1172         if (!field->field_name[0]) {
1173                 ret = 0;
1174                 goto end;
1175         }
1176
1177         /* Open field */
1178         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_event_field);
1179         if (ret) {
1180                 goto end;
1181         }
1182
1183         if (!field->field_name[0]) {
1184                 goto close;
1185         }
1186
1187         /* Name */
1188         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1189                         field->field_name);
1190         if (ret) {
1191                 goto end;
1192         }
1193
1194         /* Type */
1195         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1196                         mi_lttng_eventfieldtype_string(field->type));
1197         if (ret) {
1198                 goto end;
1199         }
1200
1201         /* nowrite  */
1202         ret = mi_lttng_writer_write_element_signed_int(writer,
1203                         mi_lttng_element_nowrite, field->nowrite);
1204         if (ret) {
1205                 goto end;
1206         }
1207
1208 close:
1209         /* Close field element */
1210         ret = mi_lttng_writer_close_element(writer);
1211
1212 end:
1213         return ret;
1214 }
1215
1216 LTTNG_HIDDEN
1217 int mi_lttng_calibrate(struct mi_writer *writer,
1218                 struct lttng_calibrate *calibrate)
1219 {
1220         int ret;
1221
1222         /* Open calibrate element */
1223         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_calibrate);
1224         if (ret) {
1225                 goto end;
1226         }
1227
1228         /* Calibration type */
1229         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1230                         mi_lttng_calibratetype_string(calibrate->type));
1231         if (ret) {
1232                 goto end;
1233         }
1234
1235         /* Closing calibrate element */
1236         ret = mi_lttng_writer_close_element(writer);
1237 end:
1238         return ret;
1239 }
1240 LTTNG_HIDDEN
1241 int mi_lttng_context(struct mi_writer *writer,
1242                 struct lttng_event_context *context, int is_open)
1243 {
1244         int ret;
1245         const char *type_string;
1246         struct lttng_event_perf_counter_ctx *perf_context;
1247         /* Open context */
1248         ret = mi_lttng_writer_open_element(writer , config_element_context);
1249         if (ret) {
1250                 goto end;
1251         }
1252
1253         type_string = mi_lttng_event_contexttype_string(context->ctx);
1254         if (!type_string) {
1255                 ret = -LTTNG_ERR_INVALID;
1256                 goto end;
1257         }
1258
1259         /* Print context type */
1260         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1261                         type_string);
1262
1263         /* Special case for PERF_*_COUNTER
1264          * print the lttng_event_perf_counter_ctx*/
1265         switch (context->ctx) {
1266         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
1267         case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
1268         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
1269                 perf_context = &context->u.perf_counter;
1270                 ret =  mi_lttng_perf_counter_context(writer, perf_context);
1271                 if (ret) {
1272                         goto end;
1273                 }
1274                 break;
1275         default:
1276                 break;
1277         }
1278
1279         /* Close context */
1280         if (!is_open) {
1281                 ret = mi_lttng_writer_close_element(writer);
1282         }
1283
1284 end:
1285         return ret;
1286 }
1287
1288 LTTNG_HIDDEN
1289 int mi_lttng_perf_counter_context(struct mi_writer *writer,
1290                 struct lttng_event_perf_counter_ctx  *perf_context)
1291 {
1292         int ret;
1293
1294         /* Open perf_counter_context */
1295         ret = mi_lttng_writer_open_element(writer,
1296                         mi_lttng_element_perf_counter_context);
1297         if (ret) {
1298                 goto end;
1299         }
1300
1301         /* Type */
1302         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1303                         config_element_type, perf_context->type);
1304         if (ret) {
1305                 goto end;
1306         }
1307
1308         /* Config */
1309         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1310                         config_element_config, perf_context->config);
1311         if (ret) {
1312                 goto end;
1313         }
1314
1315         /* Name of the perf counter */
1316         ret = mi_lttng_writer_write_element_string(writer,
1317                         config_element_name, perf_context->name);
1318         if (ret) {
1319                 goto end;
1320         }
1321
1322         /* Close perf_counter_context */
1323         ret = mi_lttng_writer_close_element(writer);
1324 end:
1325         return ret;
1326 }
1327
1328 LTTNG_HIDDEN
1329 int mi_lttng_snapshot_output_session_name(struct mi_writer *writer,
1330                 const char *session_name)
1331 {
1332         int ret;
1333
1334         /* Open session element */
1335         ret = mi_lttng_writer_open_element(writer, config_element_session);
1336         if (ret) {
1337                 goto end;
1338         }
1339
1340         /* Snapshot output list for current session name */
1341         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1342                         session_name);
1343
1344         /* Open element snapshots (sequence one snapshot) */
1345         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_snapshots);
1346         if (ret) {
1347                 goto end;
1348         }
1349
1350 end:
1351         return ret;
1352 }
1353
1354 LTTNG_HIDDEN
1355 int mi_lttng_snapshot_list_output(struct mi_writer *writer,
1356                 struct lttng_snapshot_output *output)
1357 {
1358         int ret;
1359
1360         /* Open element snapshot output */
1361         ret = mi_lttng_writer_open_element(writer,
1362                         mi_lttng_element_command_snapshot);
1363         if (ret) {
1364                 goto end;
1365         }
1366
1367         /* ID of the snapshot output */
1368         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1369                         mi_lttng_element_id, output->id);
1370         if (ret) {
1371                 goto end;
1372         }
1373
1374         /* Name of the output */
1375         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1376                         output->name);
1377         if (ret) {
1378                 goto end;
1379         }
1380
1381         /* Destination of the output (ctrl_url)*/
1382         ret = mi_lttng_writer_write_element_string(writer,
1383                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1384         if (ret) {
1385                 goto end;
1386         }
1387
1388         /* Destination of the output (data_url) */
1389         ret = mi_lttng_writer_write_element_string(writer,
1390                         mi_lttng_element_snapshot_data_url, output->data_url);
1391         if (ret) {
1392                 goto end;
1393         }
1394
1395         /* total size of all stream combined */
1396         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1397                         mi_lttng_element_snapshot_max_size, output->max_size);
1398         if (ret) {
1399                 goto end;
1400         }
1401
1402         /* Close snapshot output element */
1403         ret = mi_lttng_writer_close_element(writer);
1404
1405 end:
1406         return ret;
1407 }
1408
1409 LTTNG_HIDDEN
1410 int mi_lttng_snapshot_del_output(struct mi_writer *writer, int id,
1411                 const char *name, const char *current_session_name)
1412 {
1413         int ret;
1414
1415         /* Open element del_snapshot */
1416         ret = mi_lttng_writer_open_element(writer,
1417                         mi_lttng_element_command_snapshot);
1418         if (ret) {
1419                 goto end;
1420         }
1421
1422
1423         if (id != UINT32_MAX) {
1424                 /* "Snapshot output "id" successfully deleted
1425                  * for "current_session_name"
1426                  * ID of the snapshot output
1427                  */
1428                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1429                                 mi_lttng_element_id, id);
1430                 if (ret) {
1431                         goto end;
1432                 }
1433         } else {
1434                 /* "Snapshot output "name" successfully deleted
1435                  * for session "current_session_name"
1436                  * Name of the output
1437                  */
1438                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1439                                 name);
1440                 if (ret) {
1441                         goto end;
1442                 }
1443         }
1444
1445         /* Snapshot was deleted for session "current_session_name"*/
1446         ret = mi_lttng_writer_write_element_string(writer,
1447                         mi_lttng_element_snapshot_session_name,
1448                         current_session_name);
1449         if (ret) {
1450                 goto end;
1451         }
1452
1453         /* Close snapshot element */
1454         ret = mi_lttng_writer_close_element(writer);
1455
1456 end:
1457         return ret;
1458 }
1459
1460 LTTNG_HIDDEN
1461 int mi_lttng_snapshot_add_output(struct mi_writer *writer,
1462                 const char *current_session_name, const char *n_ptr,
1463                 struct lttng_snapshot_output *output)
1464 {
1465         int ret;
1466
1467         /* Open element snapshot */
1468         ret = mi_lttng_writer_open_element(writer,
1469                         mi_lttng_element_command_snapshot);
1470         if (ret) {
1471                 goto end;
1472         }
1473
1474         /* Snapshot output id */
1475         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1476                         mi_lttng_element_id, output->id);
1477         if (ret) {
1478                 goto end;
1479         }
1480
1481         /* Snapshot output names */
1482         ret = mi_lttng_writer_write_element_string(writer,
1483                         config_element_name, n_ptr);
1484         if (ret) {
1485                 goto end;
1486         }
1487
1488         /* Destination of the output (ctrl_url)*/
1489         ret = mi_lttng_writer_write_element_string(writer,
1490                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1491         if (ret) {
1492                 goto end;
1493         }
1494
1495         /* Snapshot added for session "current_session_name"*/
1496         ret = mi_lttng_writer_write_element_string(writer,
1497                         mi_lttng_element_snapshot_session_name, current_session_name);
1498         if (ret) {
1499                 goto end;
1500         }
1501
1502         /* total size of all stream combined */
1503         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1504                         mi_lttng_element_snapshot_max_size, output->max_size);
1505         if (ret) {
1506                 goto end;
1507         }
1508
1509         /* Close snapshot element */
1510         ret = mi_lttng_writer_close_element(writer);
1511
1512 end:
1513         return ret;
1514 }
1515
1516 LTTNG_HIDDEN
1517 int mi_lttng_snapshot_record(struct mi_writer *writer,
1518                 const char *current_session_name, const char *url,
1519                 const char *cmdline_ctrl_url, const char *cmdline_data_url)
1520 {
1521         int ret;
1522
1523         /* Open element snapshot */
1524         ret = mi_lttng_writer_open_element(writer,
1525                         mi_lttng_element_command_snapshot);
1526         if (ret) {
1527                 goto end;
1528         }
1529
1530         /*
1531          * If a valid an URL was given, serialize it,
1532          * else take the command line data and ctrl urls*/
1533         if (url) {
1534                 /* Destination of the output (ctrl_url)*/
1535                 ret = mi_lttng_writer_write_element_string(writer,
1536                                 mi_lttng_element_snapshot_ctrl_url, url);
1537                 if (ret) {
1538                         goto end;
1539                 }
1540         } else if (cmdline_ctrl_url) {
1541                 /* Destination of the output (ctrl_url)*/
1542                 ret = mi_lttng_writer_write_element_string(writer,
1543                                 mi_lttng_element_snapshot_ctrl_url, cmdline_ctrl_url);
1544                 if (ret) {
1545                         goto end;
1546                 }
1547
1548                 /* Destination of the output (data_url) */
1549                 ret = mi_lttng_writer_write_element_string(writer,
1550                                 mi_lttng_element_snapshot_data_url, cmdline_data_url);
1551                 if (ret) {
1552                         goto end;
1553                 }
1554         }
1555
1556         /* Close record_snapshot element */
1557         ret = mi_lttng_writer_close_element(writer);
1558
1559 end:
1560         return ret;
1561 }