src/common/mi-lttng.c

   1 /*
   2  * Copyright (C) 2014 Jonathan Rajotte <jonathan.r.julien@gmail.com>
   3  * Copyright (C) 2014 Olivier Cotte <olivier.cotte@polymtl.ca>
   4  * Copyright (C) 2016 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   5  *
   6  * SPDX-License-Identifier: GPL-2.0-only
   7  *
   8  */
   9
  10 #include "lttng/tracker.h"
  11 #define _LGPL_SOURCE
  12 #include "mi-lttng.h"
  13 #include <common/config/session-config.h>
  14 #include <common/defaults.h>
  15 #include <common/tracker.h>
  16 #include <lttng/channel.h>
  17 #include <lttng/snapshot-internal.h>
  18
  19 #include <assert.h>
  20
  21 #define MI_SCHEMA_MAJOR_VERSION 4
  22 #define MI_SCHEMA_MINOR_VERSION 0
  23
  24 /* Machine interface namespace URI */
  25 LTTNG_HIDDEN const char * const mi_lttng_xmlns = "xmlns";
  26 LTTNG_HIDDEN const char * const mi_lttng_xmlns_xsi = "xmlns:xsi";
  27 LTTNG_HIDDEN const char * const mi_lttng_w3_schema_uri = "http://www.w3.org/2001/XMLSchema-instance";
  28 LTTNG_HIDDEN const char * const mi_lttng_schema_location = "xsi:schemaLocation";
  29 LTTNG_HIDDEN const char * const mi_lttng_schema_location_uri =
  30         DEFAULT_LTTNG_MI_NAMESPACE " "
  31         "https://lttng.org/xml/schemas/lttng-mi/" XSTR(MI_SCHEMA_MAJOR_VERSION)
  32         "/lttng-mi-" XSTR(MI_SCHEMA_MAJOR_VERSION) "."
  33         XSTR(MI_SCHEMA_MINOR_VERSION) ".xsd";
  34 LTTNG_HIDDEN const char * const mi_lttng_schema_version = "schemaVersion";
  35 LTTNG_HIDDEN const char * const mi_lttng_schema_version_value = XSTR(MI_SCHEMA_MAJOR_VERSION)
  36         "." XSTR(MI_SCHEMA_MINOR_VERSION);
  37
  38 /* Strings related to command */
  39 const char * const mi_lttng_element_command = "command";
  40 const char * const mi_lttng_element_command_action = "snapshot_action";
  41 const char * const mi_lttng_element_command_add_context = "add-context";
  42 const char * const mi_lttng_element_command_create = "create";
  43 const char * const mi_lttng_element_command_destroy = "destroy";
  44 const char * const mi_lttng_element_command_disable_channel = "disable-channel";
  45 const char * const mi_lttng_element_command_disable_event = "disable-event";
  46 const char * const mi_lttng_element_command_enable_channels = "enable-channel";
  47 const char * const mi_lttng_element_command_enable_event = "enable-event";
  48 const char * const mi_lttng_element_command_list = "list";
  49 const char * const mi_lttng_element_command_load = "load";
  50 LTTNG_HIDDEN const char * const mi_lttng_element_command_metadata = "metadata";
  51 LTTNG_HIDDEN const char * const mi_lttng_element_command_metadata_action = "metadata_action";
  52 LTTNG_HIDDEN const char * const mi_lttng_element_command_regenerate = "regenerate";
  53 LTTNG_HIDDEN const char * const mi_lttng_element_command_regenerate_action = "regenerate_action";
  54 const char * const mi_lttng_element_command_name = "name";
  55 const char * const mi_lttng_element_command_output = "output";
  56 const char * const mi_lttng_element_command_save = "save";
  57 const char * const mi_lttng_element_command_set_session = "set-session";
  58 const char * const mi_lttng_element_command_snapshot = "snapshot";
  59 const char * const mi_lttng_element_command_snapshot_add = "add_snapshot";
  60 const char * const mi_lttng_element_command_snapshot_del = "del_snapshot";
  61 const char * const mi_lttng_element_command_snapshot_list = "list_snapshot";
  62 const char * const mi_lttng_element_command_snapshot_record = "record_snapshot";
  63 const char * const mi_lttng_element_command_start = "start";
  64 const char * const mi_lttng_element_command_stop = "stop";
  65 const char * const mi_lttng_element_command_success = "success";
  66 const char * const mi_lttng_element_command_track = "track";
  67 const char * const mi_lttng_element_command_untrack = "untrack";
  68 const char * const mi_lttng_element_command_version = "version";
  69 LTTNG_HIDDEN const char * const mi_lttng_element_command_rotate = "rotate";
  70 LTTNG_HIDDEN const char * const mi_lttng_element_command_enable_rotation = "enable-rotation";
  71 LTTNG_HIDDEN const char * const mi_lttng_element_command_disable_rotation = "disable-rotation";
  72 LTTNG_HIDDEN const char * const mi_lttng_element_command_clear = "clear";
  73
  74 /* Strings related to version command */
  75 const char * const mi_lttng_element_version = "version";
  76 const char * const mi_lttng_element_version_commit = "commit";
  77 const char * const mi_lttng_element_version_description = "description";
  78 const char * const mi_lttng_element_version_license = "license";
  79 const char * const mi_lttng_element_version_major = "major";
  80 const char * const mi_lttng_element_version_minor = "minor";
  81 const char * const mi_lttng_element_version_patch_level = "patchLevel";
  82 const char * const mi_lttng_element_version_str = "string";
  83 const char * const mi_lttng_element_version_web = "url";
  84
  85 /* String related to a lttng_event_field */
  86 const char * const mi_lttng_element_event_field = "event_field";
  87 const char * const mi_lttng_element_event_fields = "event_fields";
  88
  89 /* String related to lttng_event_perf_counter_ctx */
  90 const char * const mi_lttng_element_perf_counter_context = "perf";
  91
  92 /* Strings related to pid */
  93 const char * const mi_lttng_element_pid_id = "id";
  94
  95 /* Strings related to save command */
  96 const char * const mi_lttng_element_save = "save";
  97
  98 /* Strings related to load command */
  99 const char * const mi_lttng_element_load = "load";
 100 LTTNG_HIDDEN const char * const mi_lttng_element_load_overrides = "overrides";
 101 LTTNG_HIDDEN const char * const mi_lttng_element_load_override_url = "url";
 102
 103 /* General elements of mi_lttng */
 104 const char * const mi_lttng_element_empty = "";
 105 const char * const mi_lttng_element_id = "id";
 106 const char * const mi_lttng_element_nowrite = "nowrite";
 107 const char * const mi_lttng_element_success = "success";
 108 const char * const mi_lttng_element_type_enum = "ENUM";
 109 const char * const mi_lttng_element_type_float = "FLOAT";
 110 const char * const mi_lttng_element_type_integer = "INTEGER";
 111 const char * const mi_lttng_element_type_other = "OTHER";
 112 const char * const mi_lttng_element_type_string = "STRING";
 113
 114 /* String related to loglevel */
 115 const char * const mi_lttng_loglevel_str_alert = "TRACE_ALERT";
 116 const char * const mi_lttng_loglevel_str_crit = "TRACE_CRIT";
 117 const char * const mi_lttng_loglevel_str_debug = "TRACE_DEBUG";
 118 const char * const mi_lttng_loglevel_str_debug_function = "TRACE_DEBUG_FUNCTION";
 119 const char * const mi_lttng_loglevel_str_debug_line = "TRACE_DEBUG_LINE";
 120 const char * const mi_lttng_loglevel_str_debug_module = "TRACE_DEBUG_MODULE";
 121 const char * const mi_lttng_loglevel_str_debug_process = "TRACE_DEBUG_PROCESS";
 122 const char * const mi_lttng_loglevel_str_debug_program = "TRACE_DEBUG_PROGRAM";
 123 const char * const mi_lttng_loglevel_str_debug_system = "TRACE_DEBUG_SYSTEM";
 124 const char * const mi_lttng_loglevel_str_debug_unit = "TRACE_DEBUG_UNIT";
 125 const char * const mi_lttng_loglevel_str_emerg = "TRACE_EMERG";
 126 const char * const mi_lttng_loglevel_str_err = "TRACE_ERR";
 127 const char * const mi_lttng_loglevel_str_info = "TRACE_INFO";
 128 const char * const mi_lttng_loglevel_str_notice = "TRACE_NOTICE";
 129 const char * const mi_lttng_loglevel_str_unknown = "UNKNOWN";
 130 const char * const mi_lttng_loglevel_str_warning = "TRACE_WARNING";
 131
 132 /* String related to loglevel JUL */
 133 const char * const mi_lttng_loglevel_str_jul_all = "JUL_ALL";
 134 const char * const mi_lttng_loglevel_str_jul_config = "JUL_CONFIG";
 135 const char * const mi_lttng_loglevel_str_jul_fine = "JUL_FINE";
 136 const char * const mi_lttng_loglevel_str_jul_finer = "JUL_FINER";
 137 const char * const mi_lttng_loglevel_str_jul_finest = "JUL_FINEST";
 138 const char * const mi_lttng_loglevel_str_jul_info = "JUL_INFO";
 139 const char * const mi_lttng_loglevel_str_jul_off = "JUL_OFF";
 140 const char * const mi_lttng_loglevel_str_jul_severe = "JUL_SEVERE";
 141 const char * const mi_lttng_loglevel_str_jul_warning = "JUL_WARNING";
 142
 143 /* String related to loglevel LOG4J */
 144 const char * const mi_lttng_loglevel_str_log4j_off = "LOG4J_OFF";
 145 const char * const mi_lttng_loglevel_str_log4j_fatal = "LOG4J_FATAL";
 146 const char * const mi_lttng_loglevel_str_log4j_error = "LOG4J_ERROR";
 147 const char * const mi_lttng_loglevel_str_log4j_warn = "LOG4J_WARN";
 148 const char * const mi_lttng_loglevel_str_log4j_info = "LOG4J_INFO";
 149 const char * const mi_lttng_loglevel_str_log4j_debug = "LOG4J_DEBUG";
 150 const char * const mi_lttng_loglevel_str_log4j_trace = "LOG4J_TRACE";
 151 const char * const mi_lttng_loglevel_str_log4j_all = "LOG4J_ALL";
 152
 153 /* String related to loglevel Python */
 154 const char * const mi_lttng_loglevel_str_python_critical = "PYTHON_CRITICAL";
 155 const char * const mi_lttng_loglevel_str_python_error = "PYTHON_ERROR";
 156 const char * const mi_lttng_loglevel_str_python_warning = "PYTHON_WARNING";
 157 const char * const mi_lttng_loglevel_str_python_info = "PYTHON_INFO";
 158 const char * const mi_lttng_loglevel_str_python_debug = "PYTHON_DEBUG";
 159 const char * const mi_lttng_loglevel_str_python_notset = "PYTHON_NOTSET";
 160
 161 /* String related to loglevel type */
 162 const char * const mi_lttng_loglevel_type_all = "ALL";
 163 const char * const mi_lttng_loglevel_type_range = "RANGE";
 164 const char * const mi_lttng_loglevel_type_single = "SINGLE";
 165 const char * const mi_lttng_loglevel_type_unknown = "UNKNOWN";
 166
 167 /* String related to a lttng_snapshot_output */
 168 const char * const mi_lttng_element_snapshot_ctrl_url = "ctrl_url";
 169 const char * const mi_lttng_element_snapshot_data_url = "data_url";
 170 const char * const mi_lttng_element_snapshot_max_size = "max_size";
 171 const char * const mi_lttng_element_snapshot_n_ptr = "n_ptr";
 172 const char * const mi_lttng_element_snapshot_session_name = "session_name";
 173 const char * const mi_lttng_element_snapshots = "snapshots";
 174
 175 /* String related to track/untrack command */
 176 const char * const mi_lttng_element_track_untrack_all_wildcard = "*";
 177
 178 LTTNG_HIDDEN const char * const mi_lttng_element_session_name = "session_name";
 179
 180 /* String related to rotate command */
 181 LTTNG_HIDDEN const char * const mi_lttng_element_rotation = "rotation";
 182 LTTNG_HIDDEN const char * const mi_lttng_element_rotate_status = "status";
 183 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_schedule = "rotation_schedule";
 184 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_schedules = "rotation_schedules";
 185 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_schedule_result = "rotation_schedule_result";
 186 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_schedule_results = "rotation_schedule_results";
 187 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_schedule_periodic = "periodic";
 188 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_schedule_periodic_time_us = "time_us";
 189 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_schedule_size_threshold = "size_threshold";
 190 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_schedule_size_threshold_bytes = "bytes";
 191 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_state = "state";
 192 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_location = "location";
 193 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_location_local = "local";
 194 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_location_local_absolute_path = "absolute_path";
 195 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_location_relay = "relay";
 196 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_location_relay_host = "host";
 197 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_location_relay_control_port = "control_port";
 198 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_location_relay_data_port = "data_port";
 199 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_location_relay_protocol = "protocol";
 200 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_location_relay_relative_path = "relative_path";
 201
 202 /* String related to enum lttng_rotation_state */
 203 LTTNG_HIDDEN const char * const mi_lttng_rotation_state_str_ongoing = "ONGOING";
 204 LTTNG_HIDDEN const char * const mi_lttng_rotation_state_str_completed = "COMPLETED";
 205 LTTNG_HIDDEN const char * const mi_lttng_rotation_state_str_expired = "EXPIRED";
 206 LTTNG_HIDDEN const char * const mi_lttng_rotation_state_str_error = "ERROR";
 207
 208 /* String related to enum lttng_trace_archive_location_relay_protocol_type */
 209 LTTNG_HIDDEN const char * const mi_lttng_rotation_location_relay_protocol_str_tcp = "TCP";
 210
 211 /* String related to add-context command */
 212 LTTNG_HIDDEN const char * const mi_lttng_element_context_symbol = "symbol";
 213
 214 /* Deprecated symbols preserved for ABI compatibility. */
 215 const char * const mi_lttng_context_type_perf_counter;
 216 const char * const mi_lttng_context_type_perf_cpu_counter;
 217 const char * const mi_lttng_context_type_perf_thread_counter;
 218 const char * const mi_lttng_element_track_untrack_pid_target;
 219 const char * const mi_lttng_element_track_untrack_targets;
 220 const char * const mi_lttng_element_calibrate;
 221 const char * const mi_lttng_element_calibrate_function;
 222 const char * const mi_lttng_element_command_calibrate;
 223
 224 /* This is a merge of jul loglevel and regular loglevel
 225  * Those should never overlap by definition
 226  * (see struct lttng_event loglevel)
 227  */
 228 LTTNG_HIDDEN
 229 const char *mi_lttng_loglevel_string(int value, enum lttng_domain_type domain)
 230 {
 231         switch (domain) {
 232         case LTTNG_DOMAIN_KERNEL:
 233         case LTTNG_DOMAIN_UST:
 234                 switch (value) {
 235                 case -1:
 236                         return mi_lttng_element_empty;
 237                 case LTTNG_LOGLEVEL_EMERG:
 238                         return mi_lttng_loglevel_str_emerg;
 239                 case LTTNG_LOGLEVEL_ALERT:
 240                         return mi_lttng_loglevel_str_alert;
 241                 case LTTNG_LOGLEVEL_CRIT:
 242                         return mi_lttng_loglevel_str_crit;
 243                 case LTTNG_LOGLEVEL_ERR:
 244                         return mi_lttng_loglevel_str_err;
 245                 case LTTNG_LOGLEVEL_WARNING:
 246                         return mi_lttng_loglevel_str_warning;
 247                 case LTTNG_LOGLEVEL_NOTICE:
 248                         return mi_lttng_loglevel_str_notice;
 249                 case LTTNG_LOGLEVEL_INFO:
 250                         return mi_lttng_loglevel_str_info;
 251                 case LTTNG_LOGLEVEL_DEBUG_SYSTEM:
 252                         return mi_lttng_loglevel_str_debug_system;
 253                 case LTTNG_LOGLEVEL_DEBUG_PROGRAM:
 254                         return mi_lttng_loglevel_str_debug_program;
 255                 case LTTNG_LOGLEVEL_DEBUG_PROCESS:
 256                         return mi_lttng_loglevel_str_debug_process;
 257                 case LTTNG_LOGLEVEL_DEBUG_MODULE:
 258                         return mi_lttng_loglevel_str_debug_module;
 259                 case LTTNG_LOGLEVEL_DEBUG_UNIT:
 260                         return mi_lttng_loglevel_str_debug_unit;
 261                 case LTTNG_LOGLEVEL_DEBUG_FUNCTION:
 262                         return mi_lttng_loglevel_str_debug_function;
 263                 case LTTNG_LOGLEVEL_DEBUG_LINE:
 264                         return mi_lttng_loglevel_str_debug_line;
 265                 case LTTNG_LOGLEVEL_DEBUG:
 266                         return mi_lttng_loglevel_str_debug;
 267                 default:
 268                         return mi_lttng_loglevel_str_unknown;
 269                 }
 270                 break;
 271         case LTTNG_DOMAIN_LOG4J:
 272                 switch (value) {
 273                 case -1:
 274                         return mi_lttng_element_empty;
 275                 case LTTNG_LOGLEVEL_LOG4J_OFF:
 276                         return mi_lttng_loglevel_str_log4j_off;
 277                 case LTTNG_LOGLEVEL_LOG4J_FATAL:
 278                         return mi_lttng_loglevel_str_log4j_fatal;
 279                 case LTTNG_LOGLEVEL_LOG4J_ERROR:
 280                         return mi_lttng_loglevel_str_log4j_error;
 281                 case LTTNG_LOGLEVEL_LOG4J_WARN:
 282                         return mi_lttng_loglevel_str_log4j_warn;
 283                 case LTTNG_LOGLEVEL_LOG4J_INFO:
 284                         return mi_lttng_loglevel_str_log4j_info;
 285                 case LTTNG_LOGLEVEL_LOG4J_DEBUG:
 286                         return mi_lttng_loglevel_str_log4j_debug;
 287                 case LTTNG_LOGLEVEL_LOG4J_TRACE:
 288                         return mi_lttng_loglevel_str_log4j_trace;
 289                 case LTTNG_LOGLEVEL_LOG4J_ALL:
 290                         return mi_lttng_loglevel_str_log4j_all;
 291                 default:
 292                         return mi_lttng_loglevel_str_unknown;
 293                 }
 294                 break;
 295         case LTTNG_DOMAIN_JUL:
 296                 switch (value) {
 297                 case -1:
 298                         return mi_lttng_element_empty;
 299                 case LTTNG_LOGLEVEL_JUL_OFF:
 300                         return mi_lttng_loglevel_str_jul_off;
 301                 case LTTNG_LOGLEVEL_JUL_SEVERE:
 302                         return mi_lttng_loglevel_str_jul_severe;
 303                 case LTTNG_LOGLEVEL_JUL_WARNING:
 304                         return mi_lttng_loglevel_str_jul_warning;
 305                 case LTTNG_LOGLEVEL_JUL_INFO:
 306                         return mi_lttng_loglevel_str_jul_info;
 307                 case LTTNG_LOGLEVEL_JUL_CONFIG:
 308                         return mi_lttng_loglevel_str_jul_config;
 309                 case LTTNG_LOGLEVEL_JUL_FINE:
 310                         return mi_lttng_loglevel_str_jul_fine;
 311                 case LTTNG_LOGLEVEL_JUL_FINER:
 312                         return mi_lttng_loglevel_str_jul_finer;
 313                 case LTTNG_LOGLEVEL_JUL_FINEST:
 314                         return mi_lttng_loglevel_str_jul_finest;
 315                 case LTTNG_LOGLEVEL_JUL_ALL:
 316                         return mi_lttng_loglevel_str_jul_all;
 317                 default:
 318                         return mi_lttng_loglevel_str_unknown;
 319                 }
 320                 break;
 321         case LTTNG_DOMAIN_PYTHON:
 322                 switch (value) {
 323                 case LTTNG_LOGLEVEL_PYTHON_CRITICAL:
 324                         return mi_lttng_loglevel_str_python_critical;
 325                 case LTTNG_LOGLEVEL_PYTHON_ERROR:
 326                         return mi_lttng_loglevel_str_python_error;
 327                 case LTTNG_LOGLEVEL_PYTHON_WARNING:
 328                         return mi_lttng_loglevel_str_python_warning;
 329                 case LTTNG_LOGLEVEL_PYTHON_INFO:
 330                         return mi_lttng_loglevel_str_python_info;
 331                 case LTTNG_LOGLEVEL_PYTHON_DEBUG:
 332                         return mi_lttng_loglevel_str_python_debug;
 333                 case LTTNG_LOGLEVEL_PYTHON_NOTSET:
 334                         return mi_lttng_loglevel_str_python_notset;
 335                 default:
 336                         return mi_lttng_loglevel_str_unknown;
 337                 }
 338                 break;
 339         default:
 340                 return mi_lttng_loglevel_str_unknown;
 341         }
 342 }
 343
 344 LTTNG_HIDDEN
 345 const char *mi_lttng_logleveltype_string(enum lttng_loglevel_type value)
 346 {
 347         switch (value) {
 348         case LTTNG_EVENT_LOGLEVEL_ALL:
 349                 return mi_lttng_loglevel_type_all;
 350         case LTTNG_EVENT_LOGLEVEL_RANGE:
 351                 return mi_lttng_loglevel_type_range;
 352         case LTTNG_EVENT_LOGLEVEL_SINGLE:
 353                 return mi_lttng_loglevel_type_single;
 354         default:
 355                 return mi_lttng_loglevel_type_unknown;
 356         }
 357 }
 358
 359 static
 360 const char *mi_lttng_eventtype_string(enum lttng_event_type value)
 361 {
 362         switch (value) {
 363         case LTTNG_EVENT_ALL:
 364                 return config_event_type_all;
 365         case LTTNG_EVENT_TRACEPOINT:
 366                 return config_event_type_tracepoint;
 367         case LTTNG_EVENT_PROBE:
 368                 return config_event_type_probe;
 369         case LTTNG_EVENT_USERSPACE_PROBE:
 370                 return config_event_type_userspace_probe;
 371         case LTTNG_EVENT_FUNCTION:
 372                 return config_event_type_function;
 373         case LTTNG_EVENT_FUNCTION_ENTRY:
 374                 return config_event_type_function_entry;
 375         case LTTNG_EVENT_SYSCALL:
 376                 return config_event_type_syscall;
 377         case LTTNG_EVENT_NOOP:
 378                 return config_event_type_noop;
 379         default:
 380                 return mi_lttng_element_empty;
 381         }
 382 }
 383
 384 static
 385 const char *mi_lttng_event_contexttype_string(enum lttng_event_context_type val)
 386 {
 387         switch (val) {
 388         case LTTNG_EVENT_CONTEXT_PID:
 389                 return config_event_context_pid;
 390         case LTTNG_EVENT_CONTEXT_PROCNAME:
 391                 return config_event_context_procname;
 392         case LTTNG_EVENT_CONTEXT_PRIO:
 393                 return config_event_context_prio;
 394         case LTTNG_EVENT_CONTEXT_NICE:
 395                 return config_event_context_nice;
 396         case LTTNG_EVENT_CONTEXT_VPID:
 397                 return config_event_context_vpid;
 398         case LTTNG_EVENT_CONTEXT_TID:
 399                 return config_event_context_tid;
 400         case LTTNG_EVENT_CONTEXT_VTID:
 401                 return config_event_context_vtid;
 402         case LTTNG_EVENT_CONTEXT_PPID:
 403                 return config_event_context_ppid;
 404         case LTTNG_EVENT_CONTEXT_VPPID:
 405                 return config_event_context_vppid;
 406         case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
 407                 return config_event_context_pthread_id;
 408         case LTTNG_EVENT_CONTEXT_HOSTNAME:
 409                 return config_event_context_hostname;
 410         case LTTNG_EVENT_CONTEXT_IP:
 411                 return config_event_context_ip;
 412         case LTTNG_EVENT_CONTEXT_INTERRUPTIBLE:
 413                 return config_event_context_interruptible;
 414         case LTTNG_EVENT_CONTEXT_PREEMPTIBLE:
 415                 return config_event_context_preemptible;
 416         case LTTNG_EVENT_CONTEXT_NEED_RESCHEDULE:
 417                 return config_event_context_need_reschedule;
 418         case LTTNG_EVENT_CONTEXT_MIGRATABLE:
 419                 return config_event_context_migratable;
 420         case LTTNG_EVENT_CONTEXT_CALLSTACK_USER:
 421                 return config_event_context_callstack_user;
 422         case LTTNG_EVENT_CONTEXT_CALLSTACK_KERNEL:
 423                 return config_event_context_callstack_kernel;
 424         case LTTNG_EVENT_CONTEXT_CGROUP_NS:
 425                 return config_event_context_cgroup_ns;
 426         case LTTNG_EVENT_CONTEXT_IPC_NS:
 427                 return config_event_context_ipc_ns;
 428         case LTTNG_EVENT_CONTEXT_MNT_NS:
 429                 return config_event_context_mnt_ns;
 430         case LTTNG_EVENT_CONTEXT_NET_NS:
 431                 return config_event_context_net_ns;
 432         case LTTNG_EVENT_CONTEXT_PID_NS:
 433                 return config_event_context_pid_ns;
 434         case LTTNG_EVENT_CONTEXT_TIME_NS:
 435                 return config_event_context_time_ns;
 436         case LTTNG_EVENT_CONTEXT_USER_NS:
 437                 return config_event_context_user_ns;
 438         case LTTNG_EVENT_CONTEXT_UTS_NS:
 439                 return config_event_context_uts_ns;
 440         case LTTNG_EVENT_CONTEXT_UID:
 441                 return config_event_context_uid;
 442         case LTTNG_EVENT_CONTEXT_EUID:
 443                 return config_event_context_euid;
 444         case LTTNG_EVENT_CONTEXT_SUID:
 445                 return config_event_context_suid;
 446         case LTTNG_EVENT_CONTEXT_GID:
 447                 return config_event_context_gid;
 448         case LTTNG_EVENT_CONTEXT_EGID:
 449                 return config_event_context_egid;
 450         case LTTNG_EVENT_CONTEXT_SGID:
 451                 return config_event_context_sgid;
 452         case LTTNG_EVENT_CONTEXT_VUID:
 453                 return config_event_context_vuid;
 454         case LTTNG_EVENT_CONTEXT_VEUID:
 455                 return config_event_context_veuid;
 456         case LTTNG_EVENT_CONTEXT_VSUID:
 457                 return config_event_context_vsuid;
 458         case LTTNG_EVENT_CONTEXT_VGID:
 459                 return config_event_context_vgid;
 460         case LTTNG_EVENT_CONTEXT_VEGID:
 461                 return config_event_context_vegid;
 462         case LTTNG_EVENT_CONTEXT_VSGID:
 463                 return config_event_context_vsgid;
 464         default:
 465                 return NULL;
 466         }
 467 }
 468
 469 LTTNG_HIDDEN
 470 const char *mi_lttng_eventfieldtype_string(enum lttng_event_field_type val)
 471 {
 472         switch (val) {
 473         case(LTTNG_EVENT_FIELD_INTEGER):
 474                 return mi_lttng_element_type_integer;
 475         case(LTTNG_EVENT_FIELD_ENUM):
 476                 return mi_lttng_element_type_enum;
 477         case(LTTNG_EVENT_FIELD_FLOAT):
 478                 return mi_lttng_element_type_float;
 479         case(LTTNG_EVENT_FIELD_STRING):
 480                 return mi_lttng_element_type_string;
 481         default:
 482                 return mi_lttng_element_type_other;
 483         }
 484 }
 485
 486 LTTNG_HIDDEN
 487 const char *mi_lttng_domaintype_string(enum lttng_domain_type value)
 488 {
 489         /* Note: This is a *duplicate* of get_domain_str from bin/lttng/utils.c */
 490         switch (value) {
 491         case LTTNG_DOMAIN_KERNEL:
 492                 return config_domain_type_kernel;
 493         case LTTNG_DOMAIN_UST:
 494                 return config_domain_type_ust;
 495         case LTTNG_DOMAIN_JUL:
 496                 return config_domain_type_jul;
 497         case LTTNG_DOMAIN_LOG4J:
 498                 return config_domain_type_log4j;
 499         case LTTNG_DOMAIN_PYTHON:
 500                 return config_domain_type_python;
 501         default:
 502                 /* Should not have an unknown domain */
 503                 assert(0);
 504                 return NULL;
 505         }
 506 }
 507
 508 LTTNG_HIDDEN
 509 const char *mi_lttng_buffertype_string(enum lttng_buffer_type value)
 510 {
 511         switch (value) {
 512         case LTTNG_BUFFER_PER_PID:
 513                 return config_buffer_type_per_pid;
 514         case LTTNG_BUFFER_PER_UID:
 515                 return config_buffer_type_per_uid;
 516         case LTTNG_BUFFER_GLOBAL:
 517                 return config_buffer_type_global;
 518         default:
 519                 /* Should not have an unknow buffer type */
 520                 assert(0);
 521                 return NULL;
 522         }
 523 }
 524
 525 LTTNG_HIDDEN
 526 const char *mi_lttng_rotation_state_string(enum lttng_rotation_state value)
 527 {
 528         switch (value) {
 529         case LTTNG_ROTATION_STATE_ONGOING:
 530                 return mi_lttng_rotation_state_str_ongoing;
 531         case LTTNG_ROTATION_STATE_COMPLETED:
 532                 return mi_lttng_rotation_state_str_completed;
 533         case LTTNG_ROTATION_STATE_EXPIRED:
 534                 return mi_lttng_rotation_state_str_expired;
 535         case LTTNG_ROTATION_STATE_ERROR:
 536                 return mi_lttng_rotation_state_str_error;
 537         default:
 538                 /* Should not have an unknow rotation state. */
 539                 assert(0);
 540                 return NULL;
 541         }
 542 }
 543
 544 LTTNG_HIDDEN
 545 const char *mi_lttng_trace_archive_location_relay_protocol_type_string(
 546                 enum lttng_trace_archive_location_relay_protocol_type value)
 547 {
 548         switch (value) {
 549         case LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP:
 550                 return mi_lttng_rotation_location_relay_protocol_str_tcp;
 551         default:
 552                 /* Should not have an unknow relay protocol. */
 553                 assert(0);
 554                 return NULL;
 555         }
 556 }
 557
 558 LTTNG_HIDDEN
 559 struct mi_writer *mi_lttng_writer_create(int fd_output, int mi_output_type)
 560 {
 561         struct mi_writer *mi_writer;
 562
 563         mi_writer = zmalloc(sizeof(struct mi_writer));
 564         if (!mi_writer) {
 565                 PERROR("zmalloc mi_writer_create");
 566                 goto end;
 567         }
 568         if (mi_output_type == LTTNG_MI_XML) {
 569                 mi_writer->writer = config_writer_create(fd_output, 0);
 570                 if (!mi_writer->writer) {
 571                         goto err_destroy;
 572                 }
 573                 mi_writer->type = LTTNG_MI_XML;
 574         } else {
 575                 goto err_destroy;
 576         }
 577
 578 end:
 579         return mi_writer;
 580
 581 err_destroy:
 582         free(mi_writer);
 583         return NULL;
 584 }
 585
 586 LTTNG_HIDDEN
 587 int mi_lttng_writer_destroy(struct mi_writer *writer)
 588 {
 589         int ret;
 590
 591         if (!writer) {
 592                 ret = -EINVAL;
 593                 goto end;
 594         }
 595
 596         ret = config_writer_destroy(writer->writer);
 597         if (ret < 0) {
 598                 goto end;
 599         }
 600
 601         free(writer);
 602 end:
 603         return ret;
 604 }
 605
 606 LTTNG_HIDDEN
 607 int mi_lttng_writer_command_open(struct mi_writer *writer, const char *command)
 608 {
 609         int ret;
 610
 611         /*
 612          * A command is always the MI's root node, it must declare the current
 613          * namespace and schema URIs and the schema's version.
 614          */
 615         ret = config_writer_open_element(writer->writer,
 616                         mi_lttng_element_command);
 617         if (ret) {
 618                 goto end;
 619         }
 620
 621         ret = config_writer_write_attribute(writer->writer,
 622                         mi_lttng_xmlns, DEFAULT_LTTNG_MI_NAMESPACE);
 623         if (ret) {
 624                 goto end;
 625         }
 626
 627         ret = config_writer_write_attribute(writer->writer,
 628                         mi_lttng_xmlns_xsi, mi_lttng_w3_schema_uri);
 629         if (ret) {
 630                 goto end;
 631         }
 632
 633         ret = config_writer_write_attribute(writer->writer,
 634                         mi_lttng_schema_location,
 635                         mi_lttng_schema_location_uri);
 636         if (ret) {
 637                 goto end;
 638         }
 639
 640         ret = config_writer_write_attribute(writer->writer,
 641                         mi_lttng_schema_version,
 642                         mi_lttng_schema_version_value);
 643         if (ret) {
 644                 goto end;
 645         }
 646
 647         ret = mi_lttng_writer_write_element_string(writer,
 648                         mi_lttng_element_command_name, command);
 649 end:
 650         return ret;
 651 }
 652
 653 LTTNG_HIDDEN
 654 int mi_lttng_writer_command_close(struct mi_writer *writer)
 655 {
 656         return mi_lttng_writer_close_element(writer);
 657 }
 658
 659 LTTNG_HIDDEN
 660 int mi_lttng_writer_open_element(struct mi_writer *writer,
 661                 const char *element_name)
 662 {
 663         return config_writer_open_element(writer->writer, element_name);
 664 }
 665
 666 LTTNG_HIDDEN
 667 int mi_lttng_writer_close_element(struct mi_writer *writer)
 668 {
 669         return config_writer_close_element(writer->writer);
 670 }
 671
 672 LTTNG_HIDDEN
 673 int mi_lttng_close_multi_element(struct mi_writer *writer,
 674                 unsigned int nb_element)
 675 {
 676         int ret, i;
 677
 678         if (nb_element < 1) {
 679                 ret = 0;
 680                 goto end;
 681         }
 682         for (i = 0; i < nb_element; i++) {
 683                 ret = mi_lttng_writer_close_element(writer);
 684                 if (ret) {
 685                         goto end;
 686                 }
 687         }
 688 end:
 689         return ret;
 690 }
 691
 692 LTTNG_HIDDEN
 693 int mi_lttng_writer_write_element_unsigned_int(struct mi_writer *writer,
 694                 const char *element_name, uint64_t value)
 695 {
 696         return config_writer_write_element_unsigned_int(writer->writer,
 697                         element_name, value);
 698 }
 699
 700 LTTNG_HIDDEN
 701 int mi_lttng_writer_write_element_signed_int(struct mi_writer *writer,
 702                 const char *element_name, int64_t value)
 703 {
 704         return config_writer_write_element_signed_int(writer->writer,
 705                         element_name, value);
 706 }
 707
 708 LTTNG_HIDDEN
 709 int mi_lttng_writer_write_element_bool(struct mi_writer *writer,
 710                 const char *element_name, int value)
 711 {
 712         return config_writer_write_element_bool(writer->writer,
 713                         element_name, value);
 714 }
 715
 716 LTTNG_HIDDEN
 717 int mi_lttng_writer_write_element_string(struct mi_writer *writer,
 718                 const char *element_name, const char *value)
 719 {
 720         return config_writer_write_element_string(writer->writer,
 721                         element_name, value);
 722 }
 723
 724 LTTNG_HIDDEN
 725 int mi_lttng_writer_write_element_double(struct mi_writer *writer,
 726                 const char *element_name,
 727                 double value)
 728 {
 729         return config_writer_write_element_double(
 730                         writer->writer, element_name, value);
 731 }
 732
 733 LTTNG_HIDDEN
 734 int mi_lttng_version(struct mi_writer *writer, struct mi_lttng_version *version,
 735         const char *lttng_description, const char *lttng_license)
 736 {
 737         int ret;
 738
 739         /* Open version */
 740         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_version);
 741         if (ret) {
 742                 goto end;
 743         }
 744
 745         /* Version string (contain info like rc etc.) */
 746         ret = mi_lttng_writer_write_element_string(writer,
 747                         mi_lttng_element_version_str, version->version);
 748         if (ret) {
 749                 goto end;
 750         }
 751
 752         /* Major version number */
 753         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 754                         mi_lttng_element_version_major, version->version_major);
 755         if (ret) {
 756                 goto end;
 757         }
 758
 759         /* Minor version number */
 760         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 761                         mi_lttng_element_version_minor, version->version_minor);
 762         if (ret) {
 763                 goto end;
 764         }
 765
 766         /* Commit version number */
 767         ret = mi_lttng_writer_write_element_string(writer,
 768                         mi_lttng_element_version_commit, version->version_commit);
 769         if (ret) {
 770                 goto end;
 771         }
 772
 773         /* Patch number */
 774         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 775                         mi_lttng_element_version_patch_level, version->version_patchlevel);
 776         if (ret) {
 777                 goto end;
 778         }
 779
 780         /* Name of the version */
 781         ret = mi_lttng_writer_write_element_string(writer,
 782                         config_element_name, version->version_name);
 783         if (ret) {
 784                 goto end;
 785         }
 786
 787         /* Description mostly related to beer... */
 788         ret = mi_lttng_writer_write_element_string(writer,
 789                         mi_lttng_element_version_description, lttng_description);
 790         if (ret) {
 791                 goto end;
 792         }
 793
 794         /* url */
 795         ret = mi_lttng_writer_write_element_string(writer,
 796                         mi_lttng_element_version_web, version->package_url);
 797         if (ret) {
 798                 goto end;
 799         }
 800
 801         /* License: free as in free beer...no...*speech* */
 802         ret = mi_lttng_writer_write_element_string(writer,
 803                         mi_lttng_element_version_license, lttng_license);
 804         if (ret) {
 805                 goto end;
 806         }
 807
 808         /* Close version element */
 809         ret = mi_lttng_writer_close_element(writer);
 810
 811 end:
 812         return ret;
 813 }
 814
 815 LTTNG_HIDDEN
 816 int mi_lttng_sessions_open(struct mi_writer *writer)
 817 {
 818         return mi_lttng_writer_open_element(writer, config_element_sessions);
 819 }
 820
 821 LTTNG_HIDDEN
 822 int mi_lttng_session(struct mi_writer *writer,
 823                 struct lttng_session *session, int is_open)
 824 {
 825         int ret;
 826
 827         assert(session);
 828
 829         /* Open sessions element */
 830         ret = mi_lttng_writer_open_element(writer,
 831                         config_element_session);
 832         if (ret) {
 833                 goto end;
 834         }
 835
 836         /* Name of the session */
 837         ret = mi_lttng_writer_write_element_string(writer,
 838                         config_element_name, session->name);
 839         if (ret) {
 840                 goto end;
 841         }
 842
 843         /* Path */
 844         ret = mi_lttng_writer_write_element_string(writer,
 845                         config_element_path, session->path);
 846         if (ret) {
 847                 goto end;
 848         }
 849
 850         /* Enabled ? */
 851         ret = mi_lttng_writer_write_element_bool(writer,
 852                         config_element_enabled, session->enabled);
 853         if (ret) {
 854                 goto end;
 855         }
 856
 857         /* Snapshot mode */
 858         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 859                         config_element_snapshot_mode, session->snapshot_mode);
 860         if (ret) {
 861                 goto end;
 862         }
 863
 864         /* Live timer interval in usec */
 865         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 866                         config_element_live_timer_interval,
 867                         session->live_timer_interval);
 868         if (ret) {
 869                 goto end;
 870         }
 871
 872         if (!is_open) {
 873                 /* Closing session element */
 874                 ret = mi_lttng_writer_close_element(writer);
 875         }
 876 end:
 877         return ret;
 878
 879 }
 880
 881 LTTNG_HIDDEN
 882 int mi_lttng_domains_open(struct mi_writer *writer)
 883 {
 884         return mi_lttng_writer_open_element(writer, config_element_domains);
 885 }
 886
 887 LTTNG_HIDDEN
 888 int mi_lttng_domain(struct mi_writer *writer,
 889                 struct lttng_domain *domain, int is_open)
 890 {
 891         int ret = 0;
 892         const char *str_domain;
 893         const char *str_buffer;
 894
 895         assert(domain);
 896
 897         /* Open domain element */
 898         ret = mi_lttng_writer_open_element(writer, config_element_domain);
 899         if (ret) {
 900                 goto end;
 901         }
 902
 903         /* Domain Type */
 904         str_domain = mi_lttng_domaintype_string(domain->type);
 905         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
 906                         str_domain);
 907         if (ret) {
 908                 goto end;
 909         }
 910
 911         /* Buffer Type */
 912         str_buffer= mi_lttng_buffertype_string(domain->buf_type);
 913         ret = mi_lttng_writer_write_element_string(writer,
 914                         config_element_buffer_type, str_buffer);
 915         if (ret) {
 916                 goto end;
 917         }
 918
 919         /* TODO: union  attr
 920          * This union is not currently used and was added for
 921          * future ust domain support.
 922          * Date: 25-06-2014
 923          * */
 924
 925         if (!is_open) {
 926                 /* Closing domain element */
 927                 ret = mi_lttng_writer_close_element(writer);
 928         }
 929
 930 end:
 931         return ret;
 932
 933 }
 934
 935 LTTNG_HIDDEN
 936 int mi_lttng_channels_open(struct mi_writer *writer)
 937 {
 938         return mi_lttng_writer_open_element(writer, config_element_channels);
 939 }
 940
 941 LTTNG_HIDDEN
 942 int mi_lttng_channel(struct mi_writer *writer,
 943                 struct lttng_channel *channel, int is_open)
 944 {
 945         int ret = 0;
 946
 947         assert(channel);
 948
 949         /* Opening channel element */
 950         ret = mi_lttng_writer_open_element(writer, config_element_channel);
 951         if (ret) {
 952                 goto end;
 953         }
 954
 955         /* Name */
 956         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
 957                         channel->name);
 958         if (ret) {
 959                 goto end;
 960         }
 961
 962         /* Enabled ? */
 963         ret = mi_lttng_writer_write_element_bool(writer,
 964                         config_element_enabled, channel->enabled);
 965         if (ret) {
 966                 goto end;
 967         }
 968
 969         /* Attribute */
 970         ret = mi_lttng_channel_attr(writer, &channel->attr);
 971         if (ret) {
 972                 goto end;
 973         }
 974
 975         if (!is_open) {
 976                 /* Closing channel element */
 977                 ret = mi_lttng_writer_close_element(writer);
 978                 if (ret) {
 979                         goto end;
 980                 }
 981         }
 982 end:
 983         return ret;
 984 }
 985
 986 LTTNG_HIDDEN
 987 int mi_lttng_channel_attr(struct mi_writer *writer,
 988                 struct lttng_channel_attr *attr)
 989 {
 990         int ret = 0;
 991         struct lttng_channel *chan = caa_container_of(attr,
 992                         struct lttng_channel, attr);
 993         uint64_t discarded_events, lost_packets, monitor_timer_interval;
 994         int64_t blocking_timeout;
 995
 996         assert(attr);
 997
 998         ret = lttng_channel_get_discarded_event_count(chan, &discarded_events);
 999         if (ret) {
1000                 goto end;
1001         }
1002
1003         ret = lttng_channel_get_lost_packet_count(chan, &lost_packets);
1004         if (ret) {
1005                 goto end;
1006         }
1007
1008         ret = lttng_channel_get_monitor_timer_interval(chan,
1009                         &monitor_timer_interval);
1010         if (ret) {
1011                 goto end;
1012         }
1013
1014         ret = lttng_channel_get_blocking_timeout(chan,
1015                         &blocking_timeout);
1016         if (ret) {
1017                 goto end;
1018         }
1019
1020         /* Opening Attributes */
1021         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1022         if (ret) {
1023                 goto end;
1024         }
1025
1026         /* Overwrite */
1027         ret = mi_lttng_writer_write_element_string(writer,
1028                 config_element_overwrite_mode,
1029                 attr->overwrite ? config_overwrite_mode_overwrite :
1030                         config_overwrite_mode_discard);
1031         if (ret) {
1032                 goto end;
1033         }
1034
1035         /* Sub buffer size in byte */
1036         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1037                 config_element_subbuf_size, attr->subbuf_size);
1038         if (ret) {
1039                 goto end;
1040         }
1041
1042         /* Number of subbuffer (power of two) */
1043         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1044                 config_element_num_subbuf,
1045                 attr->num_subbuf);
1046         if (ret) {
1047                 goto end;
1048         }
1049
1050         /* Switch timer interval in usec */
1051         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1052                 config_element_switch_timer_interval,
1053                 attr->switch_timer_interval);
1054         if (ret) {
1055                 goto end;
1056         }
1057
1058         /* Read timer interval in usec */
1059         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1060                 config_element_read_timer_interval,
1061                 attr->read_timer_interval);
1062         if (ret) {
1063                 goto end;
1064         }
1065
1066         /* Monitor timer interval in usec */
1067         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1068                 config_element_monitor_timer_interval,
1069                 monitor_timer_interval);
1070         if (ret) {
1071                 goto end;
1072         }
1073
1074         /* Retry timeout in usec */
1075         ret = mi_lttng_writer_write_element_signed_int(writer,
1076                 config_element_blocking_timeout,
1077                 blocking_timeout);
1078         if (ret) {
1079                 goto end;
1080         }
1081
1082         /* Event output */
1083         ret = mi_lttng_writer_write_element_string(writer,
1084                 config_element_output_type,
1085                 attr->output == LTTNG_EVENT_SPLICE ?
1086                 config_output_type_splice : config_output_type_mmap);
1087         if (ret) {
1088                 goto end;
1089         }
1090
1091         /* Tracefile size in bytes */
1092         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1093                 config_element_tracefile_size, attr->tracefile_size);
1094         if (ret) {
1095                 goto end;
1096         }
1097
1098         /* Count of tracefiles */
1099         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1100                 config_element_tracefile_count,
1101                 attr->tracefile_count);
1102         if (ret) {
1103                 goto end;
1104         }
1105
1106         /* Live timer interval in usec*/
1107         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1108                 config_element_live_timer_interval,
1109                 attr->live_timer_interval);
1110         if (ret) {
1111                 goto end;
1112         }
1113
1114         /* Discarded events */
1115         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1116                 config_element_discarded_events,
1117                 discarded_events);
1118         if (ret) {
1119                 goto end;
1120         }
1121
1122         /* Lost packets */
1123         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1124                 config_element_lost_packets,
1125                 lost_packets);
1126         if (ret) {
1127                 goto end;
1128         }
1129
1130         /* Closing attributes */
1131         ret = mi_lttng_writer_close_element(writer);
1132         if (ret) {
1133                 goto end;
1134         }
1135 end:
1136         return ret;
1137
1138 }
1139
1140 LTTNG_HIDDEN
1141 int mi_lttng_event_common_attributes(struct mi_writer *writer,
1142                 struct lttng_event *event)
1143 {
1144         int ret;
1145         const char *filter_expression;
1146
1147         /* Open event element */
1148         ret = mi_lttng_writer_open_element(writer, config_element_event);
1149         if (ret) {
1150                 goto end;
1151         }
1152
1153         /* Event name */
1154         ret = mi_lttng_writer_write_element_string(writer,
1155                         config_element_name, event->name);
1156         if (ret) {
1157                 goto end;
1158         }
1159
1160         /* Event type */
1161         ret = mi_lttng_writer_write_element_string(writer,
1162                         config_element_type, mi_lttng_eventtype_string(event->type));
1163         if (ret) {
1164                 goto end;
1165         }
1166
1167         /* Is event enabled */
1168         ret = mi_lttng_writer_write_element_bool(writer,
1169                         config_element_enabled, event->enabled);
1170         if (ret) {
1171                 goto end;
1172         }
1173
1174         /* Event filter expression */
1175         ret = lttng_event_get_filter_expression(event, &filter_expression);
1176         if (ret) {
1177                 goto end;
1178         }
1179
1180         if (filter_expression) {
1181                 ret = mi_lttng_writer_write_element_string(writer,
1182                                 config_element_filter_expression,
1183                                 filter_expression);
1184                 if (ret) {
1185                         goto end;
1186                 }
1187         }
1188
1189 end:
1190         return ret;
1191 }
1192
1193 static int write_event_exclusions(struct mi_writer *writer,
1194                 struct lttng_event *event)
1195 {
1196         int i;
1197         int ret;
1198         int exclusion_count;
1199
1200         /* Open event exclusions */
1201         ret = mi_lttng_writer_open_element(writer, config_element_exclusions);
1202         if (ret) {
1203                 goto end;
1204         }
1205
1206         exclusion_count = lttng_event_get_exclusion_name_count(event);
1207         if (exclusion_count < 0) {
1208                 ret = exclusion_count;
1209                 goto end;
1210         }
1211
1212         for (i = 0; i < exclusion_count; i++) {
1213                 const char *name;
1214
1215                 ret = lttng_event_get_exclusion_name(event, i, &name);
1216                 if (ret) {
1217                         /* Close exclusions */
1218                         mi_lttng_writer_close_element(writer);
1219                         goto end;
1220                 }
1221
1222                 ret = mi_lttng_writer_write_element_string(writer,
1223                                 config_element_exclusion, name);
1224                 if (ret) {
1225                         /* Close exclusions */
1226                         mi_lttng_writer_close_element(writer);
1227                         goto end;
1228                 }
1229         }
1230
1231         /* Close exclusions */
1232         ret = mi_lttng_writer_close_element(writer);
1233
1234 end:
1235         return ret;
1236 }
1237
1238 LTTNG_HIDDEN
1239 int mi_lttng_event_tracepoint_loglevel(struct mi_writer *writer,
1240                 struct lttng_event *event, enum lttng_domain_type domain)
1241 {
1242         int ret;
1243
1244         /* Event loglevel */
1245         ret = mi_lttng_writer_write_element_string(writer,
1246                         config_element_loglevel,
1247                         mi_lttng_loglevel_string(event->loglevel, domain));
1248         if (ret) {
1249                 goto end;
1250         }
1251
1252         /* Log level type */
1253         ret = mi_lttng_writer_write_element_string(writer,
1254                         config_element_loglevel_type,
1255                         mi_lttng_logleveltype_string(event->loglevel_type));
1256         if (ret) {
1257                 goto end;
1258         }
1259
1260         /* Event exclusions */
1261         ret = write_event_exclusions(writer, event);
1262
1263 end:
1264         return ret;
1265 }
1266
1267 LTTNG_HIDDEN
1268 int mi_lttng_event_tracepoint_no_loglevel(struct mi_writer *writer,
1269                 struct lttng_event *event)
1270 {
1271         /* event exclusion filter */
1272         return write_event_exclusions(writer, event);
1273 }
1274
1275 LTTNG_HIDDEN
1276 int mi_lttng_event_function_probe(struct mi_writer *writer,
1277                 struct lttng_event *event)
1278 {
1279         int ret;
1280
1281         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1282         if (ret) {
1283                 goto end;
1284         }
1285
1286         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1287         if (ret) {
1288                 goto end;
1289         }
1290
1291         if (event->attr.probe.addr != 0) {
1292                 /* event probe address */
1293                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1294                                 config_element_address, event->attr.probe.addr);
1295                 if (ret) {
1296                         goto end;
1297                 }
1298         } else {
1299                 /* event probe offset */
1300                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1301                                 config_element_offset, event->attr.probe.offset);
1302                 if (ret) {
1303                         goto end;
1304                 }
1305
1306                 /* event probe symbol_name */
1307                 ret = mi_lttng_writer_write_element_string(writer,
1308                                 config_element_symbol_name, event->attr.probe.symbol_name);
1309                 if (ret) {
1310                         goto end;
1311                 }
1312         }
1313
1314         /* Close probe_attributes and attributes */
1315         ret = mi_lttng_close_multi_element(writer, 2);
1316 end:
1317         return ret;
1318 }
1319
1320 static
1321 int mi_lttng_event_userspace_probe(struct mi_writer *writer,
1322                 struct lttng_event *event)
1323 {
1324         int ret;
1325         const struct lttng_userspace_probe_location *location;
1326         const struct lttng_userspace_probe_location_lookup_method *lookup_method;
1327         enum lttng_userspace_probe_location_lookup_method_type lookup_type;
1328
1329         location = lttng_event_get_userspace_probe_location(event);
1330         if (!location) {
1331                 ret = -LTTNG_ERR_INVALID;
1332                 goto end;
1333         }
1334
1335         lookup_method = lttng_userspace_probe_location_get_lookup_method(location);
1336         if (!lookup_method) {
1337                 ret = -LTTNG_ERR_INVALID;
1338                 goto end;
1339         }
1340
1341         lookup_type = lttng_userspace_probe_location_lookup_method_get_type(lookup_method);
1342
1343         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1344         if (ret) {
1345                 goto end;
1346         }
1347
1348         switch (lttng_userspace_probe_location_get_type(location)) {
1349         case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_FUNCTION:
1350         {
1351                 const char *function_name;
1352                 const char *binary_path;
1353
1354                 ret = mi_lttng_writer_open_element(writer,
1355                                 config_element_userspace_probe_function_attributes);
1356                 if (ret) {
1357                         goto end;
1358                 }
1359
1360                 switch (lookup_type) {
1361                 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF:
1362                         ret = mi_lttng_writer_write_element_string(writer,
1363                                         config_element_userspace_probe_lookup,
1364                                         config_element_userspace_probe_lookup_function_elf);
1365                         if (ret) {
1366                                 goto end;
1367                         }
1368                         break;
1369                 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_DEFAULT:
1370                         ret = mi_lttng_writer_write_element_string(writer,
1371                                         config_element_userspace_probe_lookup,
1372                                         config_element_userspace_probe_lookup_function_default);
1373                         if (ret) {
1374                                 goto end;
1375                         }
1376                         break;
1377                 default:
1378                         goto end;
1379                 }
1380
1381                 binary_path = lttng_userspace_probe_location_function_get_binary_path(location);
1382                 ret = mi_lttng_writer_write_element_string(writer,
1383                                 config_element_userspace_probe_location_binary_path, binary_path);
1384                 if (ret) {
1385                         goto end;
1386                 }
1387
1388                 function_name = lttng_userspace_probe_location_function_get_function_name(location);
1389                 ret = mi_lttng_writer_write_element_string(writer,
1390                                 config_element_userspace_probe_function_location_function_name,
1391                                 function_name);
1392                 if (ret) {
1393                         goto end;
1394                 }
1395
1396                 break;
1397         }
1398         case LTTNG_USERSPACE_PROBE_LOCATION_TYPE_TRACEPOINT:
1399         {
1400                 const char *probe_name, *provider_name;
1401                 const char *binary_path;
1402
1403                 ret = mi_lttng_writer_open_element(writer,
1404                                 config_element_userspace_probe_function_attributes);
1405                 if (ret) {
1406                         goto end;
1407                 }
1408
1409                 switch (lookup_type) {
1410                 case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT:
1411                         ret = mi_lttng_writer_write_element_string(writer,
1412                                         config_element_userspace_probe_lookup,
1413                                         config_element_userspace_probe_lookup_tracepoint_sdt);
1414                         if (ret) {
1415                                 goto end;
1416                         }
1417                         break;
1418                 default:
1419                         goto end;
1420                 }
1421
1422                 binary_path = lttng_userspace_probe_location_tracepoint_get_binary_path(location);
1423                 ret = mi_lttng_writer_write_element_string(writer,
1424                                 config_element_userspace_probe_location_binary_path,
1425                                 binary_path);
1426                 if (ret) {
1427                         goto end;
1428                 }
1429
1430                 provider_name = lttng_userspace_probe_location_tracepoint_get_provider_name(location);
1431                 ret = mi_lttng_writer_write_element_string(writer,
1432                                 config_element_userspace_probe_tracepoint_location_provider_name,
1433                                 provider_name);
1434                 if (ret) {
1435                         goto end;
1436                 }
1437
1438                 probe_name = lttng_userspace_probe_location_tracepoint_get_probe_name(location);
1439                 ret = mi_lttng_writer_write_element_string(writer,
1440                                 config_element_userspace_probe_tracepoint_location_probe_name, probe_name);
1441                 if (ret) {
1442                         goto end;
1443                 }
1444                 break;
1445         }
1446         default:
1447                 ERR("Invalid probe type encountered");
1448         }
1449         /* Close probe_attributes and attributes */
1450         ret = mi_lttng_close_multi_element(writer, 2);
1451 end:
1452         return ret;
1453 }
1454
1455 LTTNG_HIDDEN
1456 int mi_lttng_event_function_entry(struct mi_writer *writer,
1457                 struct lttng_event *event)
1458 {
1459         int ret;
1460
1461         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1462         if (ret) {
1463                 goto end;
1464         }
1465
1466         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1467         if (ret) {
1468                 goto end;
1469         }
1470
1471         /* event probe symbol_name */
1472         ret = mi_lttng_writer_write_element_string(writer,
1473                         config_element_symbol_name, event->attr.ftrace.symbol_name);
1474         if (ret) {
1475                 goto end;
1476         }
1477
1478         /* Close function_attributes and attributes */
1479         ret = mi_lttng_close_multi_element(writer, 2);
1480 end:
1481         return ret;
1482 }
1483
1484 LTTNG_HIDDEN
1485 int mi_lttng_events_open(struct mi_writer *writer)
1486 {
1487         return mi_lttng_writer_open_element(writer, config_element_events);
1488 }
1489
1490 LTTNG_HIDDEN
1491 int mi_lttng_event(struct mi_writer *writer,
1492                 struct lttng_event *event, int is_open, enum lttng_domain_type domain)
1493 {
1494         int ret;
1495
1496         ret = mi_lttng_event_common_attributes(writer, event);
1497         if (ret) {
1498                 goto end;
1499         }
1500
1501         switch (event->type) {
1502         case LTTNG_EVENT_TRACEPOINT:
1503         {
1504                 if (event->loglevel != -1) {
1505                         ret = mi_lttng_event_tracepoint_loglevel(writer, event, domain);
1506                 } else {
1507                         ret = mi_lttng_event_tracepoint_no_loglevel(writer, event);
1508                 }
1509                 break;
1510         }
1511         case LTTNG_EVENT_FUNCTION:
1512                 /* Fallthrough */
1513         case LTTNG_EVENT_PROBE:
1514                 ret = mi_lttng_event_function_probe(writer, event);
1515                 break;
1516         case LTTNG_EVENT_FUNCTION_ENTRY:
1517                 ret = mi_lttng_event_function_entry(writer, event);
1518                 break;
1519         case LTTNG_EVENT_USERSPACE_PROBE:
1520                 ret = mi_lttng_event_userspace_probe(writer, event);
1521                 break;
1522         case LTTNG_EVENT_ALL:
1523                 /* Fallthrough */
1524         default:
1525                 break;
1526         }
1527
1528         if (ret) {
1529                 goto end;
1530         }
1531
1532         if (!is_open) {
1533                 ret = mi_lttng_writer_close_element(writer);
1534         }
1535
1536 end:
1537         return ret;
1538 }
1539
1540 LTTNG_HIDDEN
1541 int mi_lttng_trackers_open(struct mi_writer *writer)
1542 {
1543         return mi_lttng_writer_open_element(
1544                         writer, config_element_process_attr_trackers);
1545 }
1546
1547 static int get_tracker_elements(enum lttng_process_attr process_attr,
1548                 const char **element_process_attr_tracker,
1549                 const char **element_process_attr_value)
1550 {
1551         int ret = 0;
1552
1553         switch (process_attr) {
1554         case LTTNG_PROCESS_ATTR_PROCESS_ID:
1555                 *element_process_attr_tracker =
1556                                 config_element_process_attr_tracker_pid;
1557                 *element_process_attr_value =
1558                                 config_element_process_attr_pid_value;
1559                 break;
1560         case LTTNG_PROCESS_ATTR_VIRTUAL_PROCESS_ID:
1561                 *element_process_attr_tracker =
1562                                 config_element_process_attr_tracker_vpid;
1563                 *element_process_attr_value =
1564                                 config_element_process_attr_vpid_value;
1565                 break;
1566         case LTTNG_PROCESS_ATTR_USER_ID:
1567                 *element_process_attr_tracker =
1568                                 config_element_process_attr_tracker_uid;
1569                 *element_process_attr_value =
1570                                 config_element_process_attr_uid_value;
1571                 break;
1572         case LTTNG_PROCESS_ATTR_VIRTUAL_USER_ID:
1573                 *element_process_attr_tracker =
1574                                 config_element_process_attr_tracker_vuid;
1575                 *element_process_attr_value =
1576                                 config_element_process_attr_vuid_value;
1577                 break;
1578         case LTTNG_PROCESS_ATTR_GROUP_ID:
1579                 *element_process_attr_tracker =
1580                                 config_element_process_attr_tracker_gid;
1581                 *element_process_attr_value =
1582                                 config_element_process_attr_gid_value;
1583                 break;
1584         case LTTNG_PROCESS_ATTR_VIRTUAL_GROUP_ID:
1585                 *element_process_attr_tracker =
1586                                 config_element_process_attr_tracker_vgid;
1587                 *element_process_attr_value =
1588                                 config_element_process_attr_vgid_value;
1589                 break;
1590         default:
1591                 ret = LTTNG_ERR_SAVE_IO_FAIL;
1592         }
1593         return ret;
1594 }
1595
1596 LTTNG_HIDDEN
1597 int mi_lttng_process_attribute_tracker_open(
1598                 struct mi_writer *writer, enum lttng_process_attr process_attr)
1599 {
1600         int ret;
1601         const char *element_tracker, *element_value;
1602
1603         ret = get_tracker_elements(
1604                         process_attr, &element_tracker, &element_value);
1605         if (ret) {
1606                 return ret;
1607         }
1608
1609         /* Open process attribute tracker element */
1610         ret = mi_lttng_writer_open_element(writer, element_tracker);
1611         if (ret) {
1612                 goto end;
1613         }
1614
1615         /* Open values element */
1616         ret = mi_lttng_process_attr_values_open(writer);
1617 end:
1618         return ret;
1619 }
1620
1621 LTTNG_HIDDEN
1622 int mi_lttng_pids_open(struct mi_writer *writer)
1623 {
1624         return mi_lttng_writer_open_element(writer, config_element_pids);
1625 }
1626
1627 /*
1628  * TODO: move the listing of pid for user agent to process semantic on
1629  * mi api bump. The use of process element break the mi api.
1630  */
1631 LTTNG_HIDDEN
1632 int mi_lttng_pid(struct mi_writer *writer,
1633                 pid_t pid,
1634                 const char *name,
1635                 int is_open)
1636 {
1637         int ret;
1638
1639         /* Open pid process */
1640         ret = mi_lttng_writer_open_element(writer, config_element_pid);
1641         if (ret) {
1642                 goto end;
1643         }
1644
1645         /* Writing pid number */
1646         ret = mi_lttng_writer_write_element_signed_int(writer,
1647                         mi_lttng_element_pid_id, (int)pid);
1648         if (ret) {
1649                 goto end;
1650         }
1651
1652         /* Writing name of the process */
1653         if (name) {
1654                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1655                                 name);
1656                 if (ret) {
1657                         goto end;
1658                 }
1659         }
1660
1661         if (!is_open) {
1662                 /* Closing Pid */
1663                 ret = mi_lttng_writer_close_element(writer);
1664         }
1665
1666 end:
1667         return ret;
1668 }
1669
1670 LTTNG_HIDDEN
1671 int mi_lttng_process_attr_values_open(struct mi_writer *writer)
1672 {
1673         return mi_lttng_writer_open_element(
1674                         writer, config_element_process_attr_values);
1675 }
1676
1677 LTTNG_HIDDEN
1678 int mi_lttng_all_process_attribute_value(struct mi_writer *writer,
1679                 enum lttng_process_attr process_attr,
1680                 bool is_open)
1681 {
1682         int ret;
1683         const char *element_id_tracker, *element_target_id;
1684
1685         ret = get_tracker_elements(
1686                         process_attr, &element_id_tracker, &element_target_id);
1687         if (ret) {
1688                 return ret;
1689         }
1690
1691         ret = mi_lttng_writer_open_element(writer, element_target_id);
1692         if (ret) {
1693                 goto end;
1694         }
1695
1696         ret = mi_lttng_writer_open_element(writer, config_element_type);
1697         if (ret) {
1698                 goto end;
1699         }
1700
1701         ret = mi_lttng_writer_write_element_bool(writer, config_element_all, 1);
1702         if (ret) {
1703                 goto end;
1704         }
1705
1706         ret = mi_lttng_writer_close_element(writer);
1707         if (ret) {
1708                 goto end;
1709         }
1710
1711         if (!is_open) {
1712                 ret = mi_lttng_writer_close_element(writer);
1713                 if (ret) {
1714                         goto end;
1715                 }
1716         }
1717 end:
1718         return ret;
1719 }
1720
1721 LTTNG_HIDDEN
1722 int mi_lttng_integral_process_attribute_value(struct mi_writer *writer,
1723                 enum lttng_process_attr process_attr,
1724                 int64_t value,
1725                 bool is_open)
1726 {
1727         int ret;
1728         const char *element_id_tracker, *element_target_id;
1729
1730         ret = get_tracker_elements(
1731                         process_attr, &element_id_tracker, &element_target_id);
1732         if (ret) {
1733                 return ret;
1734         }
1735
1736         ret = mi_lttng_writer_open_element(writer, element_target_id);
1737         if (ret) {
1738                 goto end;
1739         }
1740
1741         ret = mi_lttng_writer_open_element(writer, config_element_type);
1742         if (ret) {
1743                 goto end;
1744         }
1745
1746         ret = mi_lttng_writer_write_element_signed_int(
1747                         writer, config_element_process_attr_id, value);
1748         if (ret) {
1749                 goto end;
1750         }
1751
1752         ret = mi_lttng_writer_close_element(writer);
1753         if (ret) {
1754                 goto end;
1755         }
1756
1757         if (!is_open) {
1758                 ret = mi_lttng_writer_close_element(writer);
1759                 if (ret) {
1760                         goto end;
1761                 }
1762         }
1763
1764 end:
1765         return ret;
1766 }
1767
1768 LTTNG_HIDDEN
1769 int mi_lttng_string_process_attribute_value(struct mi_writer *writer,
1770                 enum lttng_process_attr process_attr,
1771                 const char *value,
1772                 bool is_open)
1773
1774 {
1775         int ret;
1776         const char *element_id_tracker, *element_target_id;
1777
1778         ret = get_tracker_elements(
1779                         process_attr, &element_id_tracker, &element_target_id);
1780         if (ret) {
1781                 return ret;
1782         }
1783
1784         ret = mi_lttng_writer_open_element(writer, element_target_id);
1785         if (ret) {
1786                 goto end;
1787         }
1788
1789         ret = mi_lttng_writer_open_element(writer, config_element_type);
1790         if (ret) {
1791                 goto end;
1792         }
1793
1794         ret = mi_lttng_writer_write_element_string(
1795                         writer, config_element_name, value);
1796         if (ret) {
1797                 goto end;
1798         }
1799
1800         ret = mi_lttng_writer_close_element(writer);
1801         if (ret) {
1802                 goto end;
1803         }
1804
1805         if (!is_open) {
1806                 ret = mi_lttng_writer_close_element(writer);
1807                 if (ret) {
1808                         goto end;
1809                 }
1810         }
1811
1812 end:
1813         return ret;
1814 }
1815
1816 LTTNG_HIDDEN
1817 int mi_lttng_event_fields_open(struct mi_writer *writer)
1818 {
1819         return mi_lttng_writer_open_element(writer, mi_lttng_element_event_fields);
1820 }
1821
1822 LTTNG_HIDDEN
1823 int mi_lttng_event_field(struct mi_writer *writer,
1824                 struct lttng_event_field *field)
1825 {
1826         int ret;
1827
1828         if (!field->field_name[0]) {
1829                 ret = 0;
1830                 goto end;
1831         }
1832
1833         /* Open field */
1834         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_event_field);
1835         if (ret) {
1836                 goto end;
1837         }
1838
1839         if (!field->field_name[0]) {
1840                 goto close;
1841         }
1842
1843         /* Name */
1844         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1845                         field->field_name);
1846         if (ret) {
1847                 goto end;
1848         }
1849
1850         /* Type */
1851         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1852                         mi_lttng_eventfieldtype_string(field->type));
1853         if (ret) {
1854                 goto end;
1855         }
1856
1857         /* nowrite  */
1858         ret = mi_lttng_writer_write_element_signed_int(writer,
1859                         mi_lttng_element_nowrite, field->nowrite);
1860         if (ret) {
1861                 goto end;
1862         }
1863
1864 close:
1865         /* Close field element */
1866         ret = mi_lttng_writer_close_element(writer);
1867
1868 end:
1869         return ret;
1870 }
1871
1872 LTTNG_HIDDEN
1873 int mi_lttng_perf_counter_context(struct mi_writer *writer,
1874                 struct lttng_event_perf_counter_ctx  *perf_context)
1875 {
1876         int ret;
1877
1878         /* Open perf_counter_context */
1879         ret = mi_lttng_writer_open_element(writer,
1880                         mi_lttng_element_perf_counter_context);
1881         if (ret) {
1882                 goto end;
1883         }
1884
1885         /* Type */
1886         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1887                         config_element_type, perf_context->type);
1888         if (ret) {
1889                 goto end;
1890         }
1891
1892         /* Config */
1893         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1894                         config_element_config, perf_context->config);
1895         if (ret) {
1896                 goto end;
1897         }
1898
1899         /* Name of the perf counter */
1900         ret = mi_lttng_writer_write_element_string(writer,
1901                         config_element_name, perf_context->name);
1902         if (ret) {
1903                 goto end;
1904         }
1905
1906         /* Close perf_counter_context */
1907         ret = mi_lttng_writer_close_element(writer);
1908 end:
1909         return ret;
1910 }
1911
1912 static
1913 int mi_lttng_app_context(struct mi_writer *writer,
1914                 const char *provider_name, const char *ctx_name)
1915 {
1916         int ret;
1917
1918         /* Open app */
1919         ret = mi_lttng_writer_open_element(writer,
1920                         config_element_context_app);
1921         if (ret) {
1922                 goto end;
1923         }
1924
1925         /* provider_name */
1926         ret = mi_lttng_writer_write_element_string(writer,
1927                         config_element_context_app_provider_name,
1928                         provider_name);
1929         if (ret) {
1930                 goto end;
1931         }
1932
1933         /* ctx_name */
1934         ret = mi_lttng_writer_write_element_string(writer,
1935                         config_element_context_app_ctx_name, ctx_name);
1936         if (ret) {
1937                 goto end;
1938         }
1939
1940         /* Close app */
1941         ret = mi_lttng_writer_close_element(writer);
1942 end:
1943         return ret;
1944 }
1945
1946 LTTNG_HIDDEN
1947 int mi_lttng_context(struct mi_writer *writer,
1948                 struct lttng_event_context *context, int is_open)
1949 {
1950         int ret;
1951
1952         /* Open context */
1953         ret = mi_lttng_writer_open_element(writer , config_element_context);
1954         if (ret) {
1955                 goto end;
1956         }
1957
1958         /* Special case for PERF_*_COUNTER
1959          * print the lttng_event_perf_counter_ctx*/
1960         switch (context->ctx) {
1961         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
1962         case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
1963         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
1964         {
1965                 struct lttng_event_perf_counter_ctx *perf_context =
1966                                 &context->u.perf_counter;
1967                 ret =  mi_lttng_perf_counter_context(writer, perf_context);
1968                 if (ret) {
1969                         goto end;
1970                 }
1971                 break;
1972         }
1973         case LTTNG_EVENT_CONTEXT_APP_CONTEXT:
1974         {
1975                 ret = mi_lttng_app_context(writer,
1976                                 context->u.app_ctx.provider_name,
1977                                 context->u.app_ctx.ctx_name);
1978                 if (ret) {
1979                         goto end;
1980                 }
1981                 break;
1982         }
1983         default:
1984         {
1985                 const char *type_string = mi_lttng_event_contexttype_string(
1986                                 context->ctx);
1987                 if (!type_string) {
1988                         ret = -LTTNG_ERR_INVALID;
1989                         goto end;
1990                 }
1991
1992                 /* Print context type */
1993                 ret = mi_lttng_writer_write_element_string(writer,
1994                                 config_element_type, type_string);
1995                 break;
1996         }
1997         }
1998
1999         /* Close context */
2000         if (!is_open) {
2001                 ret = mi_lttng_writer_close_element(writer);
2002         }
2003
2004 end:
2005         return ret;
2006 }
2007
2008 LTTNG_HIDDEN
2009 int mi_lttng_snapshot_output_session_name(struct mi_writer *writer,
2010                 const char *session_name)
2011 {
2012         int ret;
2013
2014         /* Open session element */
2015         ret = mi_lttng_writer_open_element(writer, config_element_session);
2016         if (ret) {
2017                 goto end;
2018         }
2019
2020         /* Snapshot output list for current session name */
2021         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
2022                         session_name);
2023         if (ret) {
2024                 goto end;
2025         }
2026
2027         /* Open element snapshots (sequence one snapshot) */
2028         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_snapshots);
2029         if (ret) {
2030                 goto end;
2031         }
2032
2033 end:
2034         return ret;
2035 }
2036
2037 LTTNG_HIDDEN
2038 int mi_lttng_snapshot_list_output(struct mi_writer *writer,
2039                 struct lttng_snapshot_output *output)
2040 {
2041         int ret;
2042
2043         /* Open element snapshot output */
2044         ret = mi_lttng_writer_open_element(writer,
2045                         mi_lttng_element_command_snapshot);
2046         if (ret) {
2047                 goto end;
2048         }
2049
2050         /* ID of the snapshot output */
2051         ret = mi_lttng_writer_write_element_unsigned_int(writer,
2052                         mi_lttng_element_id, output->id);
2053         if (ret) {
2054                 goto end;
2055         }
2056
2057         /* Name of the output */
2058         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
2059                         output->name);
2060         if (ret) {
2061                 goto end;
2062         }
2063
2064         /* Destination of the output (ctrl_url)*/
2065         ret = mi_lttng_writer_write_element_string(writer,
2066                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
2067         if (ret) {
2068                 goto end;
2069         }
2070
2071         /* Destination of the output (data_url) */
2072         ret = mi_lttng_writer_write_element_string(writer,
2073                         mi_lttng_element_snapshot_data_url, output->data_url);
2074         if (ret) {
2075                 goto end;
2076         }
2077
2078         /* total size of all stream combined */
2079         ret = mi_lttng_writer_write_element_unsigned_int(writer,
2080                         mi_lttng_element_snapshot_max_size, output->max_size);
2081         if (ret) {
2082                 goto end;
2083         }
2084
2085         /* Close snapshot output element */
2086         ret = mi_lttng_writer_close_element(writer);
2087
2088 end:
2089         return ret;
2090 }
2091
2092 LTTNG_HIDDEN
2093 int mi_lttng_snapshot_del_output(struct mi_writer *writer, int id,
2094                 const char *name, const char *current_session_name)
2095 {
2096         int ret;
2097
2098         /* Open element del_snapshot */
2099         ret = mi_lttng_writer_open_element(writer,
2100                         mi_lttng_element_command_snapshot);
2101         if (ret) {
2102                 goto end;
2103         }
2104
2105
2106         if (id != UINT32_MAX) {
2107                 /* "Snapshot output "id" successfully deleted
2108                  * for "current_session_name"
2109                  * ID of the snapshot output
2110                  */
2111                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
2112                                 mi_lttng_element_id, id);
2113                 if (ret) {
2114                         goto end;
2115                 }
2116         } else {
2117                 /* "Snapshot output "name" successfully deleted
2118                  * for session "current_session_name"
2119                  * Name of the output
2120                  */
2121                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
2122                                 name);
2123                 if (ret) {
2124                         goto end;
2125                 }
2126         }
2127
2128         /* Snapshot was deleted for session "current_session_name"*/
2129         ret = mi_lttng_writer_write_element_string(writer,
2130                         mi_lttng_element_snapshot_session_name,
2131                         current_session_name);
2132         if (ret) {
2133                 goto end;
2134         }
2135
2136         /* Close snapshot element */
2137         ret = mi_lttng_writer_close_element(writer);
2138
2139 end:
2140         return ret;
2141 }
2142
2143 LTTNG_HIDDEN
2144 int mi_lttng_snapshot_add_output(struct mi_writer *writer,
2145                 const char *current_session_name, const char *n_ptr,
2146                 struct lttng_snapshot_output *output)
2147 {
2148         int ret;
2149
2150         /* Open element snapshot */
2151         ret = mi_lttng_writer_open_element(writer,
2152                         mi_lttng_element_command_snapshot);
2153         if (ret) {
2154                 goto end;
2155         }
2156
2157         /* Snapshot output id */
2158         ret = mi_lttng_writer_write_element_unsigned_int(writer,
2159                         mi_lttng_element_id, output->id);
2160         if (ret) {
2161                 goto end;
2162         }
2163
2164         /* Snapshot output names */
2165         ret = mi_lttng_writer_write_element_string(writer,
2166                         config_element_name, n_ptr);
2167         if (ret) {
2168                 goto end;
2169         }
2170
2171         /* Destination of the output (ctrl_url)*/
2172         ret = mi_lttng_writer_write_element_string(writer,
2173                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
2174         if (ret) {
2175                 goto end;
2176         }
2177
2178         /* Snapshot added for session "current_session_name"*/
2179         ret = mi_lttng_writer_write_element_string(writer,
2180                         mi_lttng_element_snapshot_session_name, current_session_name);
2181         if (ret) {
2182                 goto end;
2183         }
2184
2185         /* total size of all stream combined */
2186         ret = mi_lttng_writer_write_element_unsigned_int(writer,
2187                         mi_lttng_element_snapshot_max_size, output->max_size);
2188         if (ret) {
2189                 goto end;
2190         }
2191
2192         /* Close snapshot element */
2193         ret = mi_lttng_writer_close_element(writer);
2194
2195 end:
2196         return ret;
2197 }
2198
2199 LTTNG_HIDDEN
2200 int mi_lttng_snapshot_record(struct mi_writer *writer,
2201                 const char *current_session_name, const char *url,
2202                 const char *cmdline_ctrl_url, const char *cmdline_data_url)
2203 {
2204         int ret;
2205
2206         /* Open element snapshot */
2207         ret = mi_lttng_writer_open_element(writer,
2208                         mi_lttng_element_command_snapshot);
2209         if (ret) {
2210                 goto end;
2211         }
2212
2213         /*
2214          * If a valid an URL was given, serialize it,
2215          * else take the command line data and ctrl urls*/
2216         if (url) {
2217                 /* Destination of the output (ctrl_url)*/
2218                 ret = mi_lttng_writer_write_element_string(writer,
2219                                 mi_lttng_element_snapshot_ctrl_url, url);
2220                 if (ret) {
2221                         goto end;
2222                 }
2223         } else if (cmdline_ctrl_url) {
2224                 /* Destination of the output (ctrl_url)*/
2225                 ret = mi_lttng_writer_write_element_string(writer,
2226                                 mi_lttng_element_snapshot_ctrl_url, cmdline_ctrl_url);
2227                 if (ret) {
2228                         goto end;
2229                 }
2230
2231                 /* Destination of the output (data_url) */
2232                 ret = mi_lttng_writer_write_element_string(writer,
2233                                 mi_lttng_element_snapshot_data_url, cmdline_data_url);
2234                 if (ret) {
2235                         goto end;
2236                 }
2237         }
2238
2239         /* Close record_snapshot element */
2240         ret = mi_lttng_writer_close_element(writer);
2241
2242 end:
2243         return ret;
2244 }
2245
2246 LTTNG_HIDDEN
2247 int mi_lttng_rotation_schedule(struct mi_writer *writer,
2248                 const struct lttng_rotation_schedule *schedule)
2249 {
2250         int ret = 0;
2251         enum lttng_rotation_status status;
2252         uint64_t value;
2253         const char *element_name;
2254         const char *value_name;
2255         bool empty_schedule = false;
2256
2257         switch (lttng_rotation_schedule_get_type(schedule)) {
2258         case LTTNG_ROTATION_SCHEDULE_TYPE_PERIODIC:
2259                 status = lttng_rotation_schedule_periodic_get_period(schedule,
2260                                 &value);
2261                 element_name = mi_lttng_element_rotation_schedule_periodic;
2262                 value_name = mi_lttng_element_rotation_schedule_periodic_time_us;
2263                 break;
2264         case LTTNG_ROTATION_SCHEDULE_TYPE_SIZE_THRESHOLD:
2265                 status = lttng_rotation_schedule_size_threshold_get_threshold(
2266                                 schedule, &value);
2267                 element_name = mi_lttng_element_rotation_schedule_size_threshold;
2268                 value_name = mi_lttng_element_rotation_schedule_size_threshold_bytes;
2269                 break;
2270         default:
2271                 ret = -1;
2272                 goto end;
2273         }
2274
2275         if (status != LTTNG_ROTATION_STATUS_OK) {
2276                 if (status == LTTNG_ROTATION_STATUS_UNAVAILABLE) {
2277                         empty_schedule = true;
2278                 } else {
2279                         ret = -1;
2280                         goto end;
2281                 }
2282         }
2283
2284         ret = mi_lttng_writer_open_element(writer, element_name);
2285         if (ret) {
2286                 goto end;
2287         }
2288
2289         if (!empty_schedule) {
2290                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
2291                                 value_name, value);
2292                 if (ret) {
2293                         goto end;
2294                 }
2295         }
2296
2297         /* Close schedule descriptor element. */
2298         ret = mi_lttng_writer_close_element(writer);
2299         if (ret) {
2300                 goto end;
2301         }
2302 end:
2303         return ret;
2304 }
2305
2306 LTTNG_HIDDEN
2307 int mi_lttng_rotation_schedule_result(struct mi_writer *writer,
2308                 const struct lttng_rotation_schedule *schedule,
2309                 bool success)
2310 {
2311         int ret = 0;
2312
2313         ret = mi_lttng_writer_open_element(writer,
2314                         mi_lttng_element_rotation_schedule_result);
2315         if (ret) {
2316                 goto end;
2317         }
2318
2319         ret = mi_lttng_writer_open_element(writer,
2320                         mi_lttng_element_rotation_schedule);
2321         if (ret) {
2322                 goto end;
2323         }
2324
2325         ret = mi_lttng_rotation_schedule(writer, schedule);
2326         if (ret) {
2327                 goto end;
2328         }
2329
2330         /* Close rotation_schedule element */
2331         ret = mi_lttng_writer_close_element(writer);
2332         if (ret) {
2333                 goto end;
2334         }
2335
2336         ret = mi_lttng_writer_write_element_bool(writer,
2337                         mi_lttng_element_command_success, success);
2338         if (ret) {
2339                 goto end;
2340         }
2341
2342         /* Close rotation_schedule_result element */
2343         ret = mi_lttng_writer_close_element(writer);
2344         if (ret) {
2345                 goto end;
2346         }
2347 end:
2348         return ret;
2349 }
2350
2351 static
2352 int mi_lttng_location(struct mi_writer *writer,
2353                 const struct lttng_trace_archive_location *location)
2354 {
2355         int ret = 0;
2356         enum lttng_trace_archive_location_type location_type;
2357         enum lttng_trace_archive_location_status status;
2358
2359         location_type = lttng_trace_archive_location_get_type(location);
2360
2361         switch (location_type) {
2362         case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL:
2363         {
2364                 const char *absolute_path;
2365
2366                 status = lttng_trace_archive_location_local_get_absolute_path(
2367                                 location, &absolute_path);
2368                 if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
2369                         ret = -1;
2370                         goto end;
2371                 }
2372
2373                 ret = mi_lttng_writer_open_element(writer,
2374                                 mi_lttng_element_rotation_location_local);
2375                 if (ret) {
2376                         goto end;
2377                 }
2378
2379
2380                 ret = mi_lttng_writer_write_element_string(writer,
2381                                 mi_lttng_element_rotation_location_local_absolute_path,
2382                                 absolute_path);
2383                 if (ret) {
2384                         goto end;
2385                 }
2386
2387                 /* Close local element */
2388                 ret = mi_lttng_writer_close_element(writer);
2389                 if (ret) {
2390                         goto end;
2391                 }
2392                 break;
2393         }
2394         case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY:
2395         {
2396                 uint16_t control_port, data_port;
2397                 const char *host, *relative_path;
2398                 enum lttng_trace_archive_location_relay_protocol_type protocol;
2399
2400                 /* Fetch all relay location parameters. */
2401                 status = lttng_trace_archive_location_relay_get_protocol_type(
2402                                 location, &protocol);
2403                 if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
2404                         ret = -1;
2405                         goto end;
2406                 }
2407
2408                 status = lttng_trace_archive_location_relay_get_host(
2409                                 location, &host);
2410                 if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
2411                         ret = -1;
2412                         goto end;
2413                 }
2414
2415                 status = lttng_trace_archive_location_relay_get_control_port(
2416                                 location, &control_port);
2417                 if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
2418                         ret = -1;
2419                         goto end;
2420                 }
2421
2422                 status = lttng_trace_archive_location_relay_get_data_port(
2423                                 location, &data_port);
2424                 if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
2425                         ret = -1;
2426                         goto end;
2427                 }
2428
2429                 status = lttng_trace_archive_location_relay_get_relative_path(
2430                                 location, &relative_path);
2431                 if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
2432                         ret = -1;
2433                         goto end;
2434                 }
2435
2436                 ret = mi_lttng_writer_open_element(writer,
2437                                 mi_lttng_element_rotation_location_relay);
2438                 if (ret) {
2439                         goto end;
2440                 }
2441
2442                 ret = mi_lttng_writer_write_element_string(writer,
2443                                 mi_lttng_element_rotation_location_relay_host,
2444                                 host);
2445                 if (ret) {
2446                         goto end;
2447                 }
2448
2449                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
2450                                 mi_lttng_element_rotation_location_relay_control_port,
2451                                 control_port);
2452                 if (ret) {
2453                         goto end;
2454                 }
2455
2456                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
2457                                 mi_lttng_element_rotation_location_relay_data_port,
2458                                 data_port);
2459                 if (ret) {
2460                         goto end;
2461                 }
2462
2463                 ret = mi_lttng_writer_write_element_string(writer,
2464                                 mi_lttng_element_rotation_location_relay_protocol,
2465                                 mi_lttng_trace_archive_location_relay_protocol_type_string(protocol));
2466                 if (ret) {
2467                         goto end;
2468                 }
2469
2470                 ret = mi_lttng_writer_write_element_string(writer,
2471                                 mi_lttng_element_rotation_location_relay_relative_path,
2472                                 relative_path);
2473                 if (ret) {
2474                         goto end;
2475                 }
2476
2477                 /* Close relay element */
2478                 ret = mi_lttng_writer_close_element(writer);
2479                 if (ret) {
2480                         goto end;
2481                 }
2482                 break;
2483         }
2484         default:
2485                 abort();
2486         }
2487 end:
2488         return ret;
2489 }
2490
2491 LTTNG_HIDDEN
2492 int mi_lttng_rotate(struct mi_writer *writer,
2493                 const char *session_name,
2494                 enum lttng_rotation_state rotation_state,
2495                 const struct lttng_trace_archive_location *location)
2496 {
2497         int ret;
2498
2499         ret = mi_lttng_writer_open_element(writer,
2500                         mi_lttng_element_rotation);
2501         if (ret) {
2502                 goto end;
2503         }
2504
2505         ret = mi_lttng_writer_write_element_string(writer,
2506                         mi_lttng_element_session_name,
2507                         session_name);
2508         if (ret) {
2509                 goto end;
2510         }
2511
2512         ret = mi_lttng_writer_write_element_string(writer,
2513                         mi_lttng_element_rotation_state,
2514                         mi_lttng_rotation_state_string(rotation_state));
2515         if (ret) {
2516                 goto end;
2517         }
2518
2519         if (!location) {
2520                 /* Not a serialization error. */
2521                 goto close_rotation;
2522         }
2523
2524         ret = mi_lttng_writer_open_element(writer,
2525                         mi_lttng_element_rotation_location);
2526         if (ret) {
2527                 goto end;
2528         }
2529
2530         ret = mi_lttng_location(writer, location);
2531         if (ret) {
2532                 goto close_location;
2533         }
2534
2535 close_location:
2536         /* Close location element */
2537         ret = mi_lttng_writer_close_element(writer);
2538         if (ret) {
2539                 goto end;
2540         }
2541
2542 close_rotation:
2543         /* Close rotation element */
2544         ret = mi_lttng_writer_close_element(writer);
2545         if (ret) {
2546                 goto end;
2547         }
2548 end:
2549         return ret;
2550 }