src/common/mi-lttng.c

   1 /*
   2  * Copyright (C) 2014 - Jonathan Rajotte <jonathan.r.julien@gmail.com>
   3  *                    - Olivier Cotte <olivier.cotte@polymtl.ca>
   4  * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License, version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc., 51
  17  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #define _LGPL_SOURCE
  21 #include <common/config/session-config.h>
  22 #include <common/defaults.h>
  23 #include <lttng/snapshot-internal.h>
  24 #include <lttng/channel.h>
  25 #include "mi-lttng.h"
  26
  27 #include <assert.h>
  28
  29 #define MI_SCHEMA_MAJOR_VERSION 3
  30 #define MI_SCHEMA_MINOR_VERSION 0
  31
  32 /* Machine interface namespace URI */
  33 LTTNG_HIDDEN const char * const mi_lttng_xmlns = "xmlns";
  34 LTTNG_HIDDEN const char * const mi_lttng_xmlns_xsi = "xmlns:xsi";
  35 LTTNG_HIDDEN const char * const mi_lttng_w3_schema_uri = "http://www.w3.org/2001/XMLSchema-instance";
  36 LTTNG_HIDDEN const char * const mi_lttng_schema_location = "xsi:schemaLocation";
  37 LTTNG_HIDDEN const char * const mi_lttng_schema_location_uri =
  38         DEFAULT_LTTNG_MI_NAMESPACE " "
  39         "http://lttng.org/xml/schemas/lttng-mi/" XSTR(MI_SCHEMA_MAJOR_VERSION)
  40         "/lttng-mi-" XSTR(MI_SCHEMA_MAJOR_VERSION) "."
  41         XSTR(MI_SCHEMA_MINOR_VERSION) ".xsd";
  42 LTTNG_HIDDEN const char * const mi_lttng_schema_version = "schemaVersion";
  43 LTTNG_HIDDEN const char * const mi_lttng_schema_version_value = XSTR(MI_SCHEMA_MAJOR_VERSION)
  44         "." XSTR(MI_SCHEMA_MINOR_VERSION);
  45
  46 /* Strings related to command */
  47 const char * const mi_lttng_element_command = "command";
  48 const char * const mi_lttng_element_command_action = "snapshot_action";
  49 const char * const mi_lttng_element_command_add_context = "add-context";
  50 const char * const mi_lttng_element_command_create = "create";
  51 const char * const mi_lttng_element_command_destroy = "destroy";
  52 const char * const mi_lttng_element_command_disable_channel = "disable-channel";
  53 const char * const mi_lttng_element_command_disable_event = "disable-event";
  54 const char * const mi_lttng_element_command_enable_channels = "enable-channel";
  55 const char * const mi_lttng_element_command_enable_event = "enable-event";
  56 const char * const mi_lttng_element_command_list = "list";
  57 const char * const mi_lttng_element_command_load = "load";
  58 LTTNG_HIDDEN const char * const mi_lttng_element_command_metadata = "metadata";
  59 LTTNG_HIDDEN const char * const mi_lttng_element_command_metadata_action = "metadata_action";
  60 LTTNG_HIDDEN const char * const mi_lttng_element_command_regenerate = "regenerate";
  61 LTTNG_HIDDEN const char * const mi_lttng_element_command_regenerate_action = "regenerate_action";
  62 const char * const mi_lttng_element_command_name = "name";
  63 const char * const mi_lttng_element_command_output = "output";
  64 const char * const mi_lttng_element_command_save = "save";
  65 const char * const mi_lttng_element_command_set_session = "set-session";
  66 const char * const mi_lttng_element_command_snapshot = "snapshot";
  67 const char * const mi_lttng_element_command_snapshot_add = "add_snapshot";
  68 const char * const mi_lttng_element_command_snapshot_del = "del_snapshot";
  69 const char * const mi_lttng_element_command_snapshot_list = "list_snapshot";
  70 const char * const mi_lttng_element_command_snapshot_record = "record_snapshot";
  71 const char * const mi_lttng_element_command_start = "start";
  72 const char * const mi_lttng_element_command_stop = "stop";
  73 const char * const mi_lttng_element_command_success = "success";
  74 const char * const mi_lttng_element_command_track = "track";
  75 const char * const mi_lttng_element_command_untrack = "untrack";
  76 const char * const mi_lttng_element_command_version = "version";
  77 const char * const mi_lttng_element_command_clear = "clear";
  78
  79 /* Strings related to version command */
  80 const char * const mi_lttng_element_version = "version";
  81 const char * const mi_lttng_element_version_commit = "commit";
  82 const char * const mi_lttng_element_version_description = "description";
  83 const char * const mi_lttng_element_version_license = "license";
  84 const char * const mi_lttng_element_version_major = "major";
  85 const char * const mi_lttng_element_version_minor = "minor";
  86 const char * const mi_lttng_element_version_patch_level = "patchLevel";
  87 const char * const mi_lttng_element_version_str = "string";
  88 const char * const mi_lttng_element_version_web = "url";
  89
  90 /* String related to a lttng_event_field */
  91 const char * const mi_lttng_element_event_field = "event_field";
  92 const char * const mi_lttng_element_event_fields = "event_fields";
  93
  94 /* String related to lttng_event_perf_counter_ctx */
  95 const char * const mi_lttng_element_perf_counter_context = "perf";
  96
  97 /* Strings related to pid */
  98 const char * const mi_lttng_element_pid_id = "id";
  99
 100 /* Strings related to save command */
 101 const char * const mi_lttng_element_save = "save";
 102
 103 /* Strings related to load command */
 104 const char * const mi_lttng_element_load = "load";
 105 LTTNG_HIDDEN const char * const mi_lttng_element_load_overrides = "overrides";
 106 LTTNG_HIDDEN const char * const mi_lttng_element_load_override_url = "url";
 107
 108 /* General elements of mi_lttng */
 109 const char * const mi_lttng_element_empty = "";
 110 const char * const mi_lttng_element_id = "id";
 111 const char * const mi_lttng_element_nowrite = "nowrite";
 112 const char * const mi_lttng_element_success = "success";
 113 const char * const mi_lttng_element_type_enum = "ENUM";
 114 const char * const mi_lttng_element_type_float = "FLOAT";
 115 const char * const mi_lttng_element_type_integer = "INTEGER";
 116 const char * const mi_lttng_element_type_other = "OTHER";
 117 const char * const mi_lttng_element_type_string = "STRING";
 118
 119 /* String related to loglevel */
 120 const char * const mi_lttng_loglevel_str_alert = "TRACE_ALERT";
 121 const char * const mi_lttng_loglevel_str_crit = "TRACE_CRIT";
 122 const char * const mi_lttng_loglevel_str_debug = "TRACE_DEBUG";
 123 const char * const mi_lttng_loglevel_str_debug_function = "TRACE_DEBUG_FUNCTION";
 124 const char * const mi_lttng_loglevel_str_debug_line = "TRACE_DEBUG_LINE";
 125 const char * const mi_lttng_loglevel_str_debug_module = "TRACE_DEBUG_MODULE";
 126 const char * const mi_lttng_loglevel_str_debug_process = "TRACE_DEBUG_PROCESS";
 127 const char * const mi_lttng_loglevel_str_debug_program = "TRACE_DEBUG_PROGRAM";
 128 const char * const mi_lttng_loglevel_str_debug_system = "TRACE_DEBUG_SYSTEM";
 129 const char * const mi_lttng_loglevel_str_debug_unit = "TRACE_DEBUG_UNIT";
 130 const char * const mi_lttng_loglevel_str_emerg = "TRACE_EMERG";
 131 const char * const mi_lttng_loglevel_str_err = "TRACE_ERR";
 132 const char * const mi_lttng_loglevel_str_info = "TRACE_INFO";
 133 const char * const mi_lttng_loglevel_str_notice = "TRACE_NOTICE";
 134 const char * const mi_lttng_loglevel_str_unknown = "UNKNOWN";
 135 const char * const mi_lttng_loglevel_str_warning = "TRACE_WARNING";
 136
 137 /* String related to loglevel JUL */
 138 const char * const mi_lttng_loglevel_str_jul_all = "JUL_ALL";
 139 const char * const mi_lttng_loglevel_str_jul_config = "JUL_CONFIG";
 140 const char * const mi_lttng_loglevel_str_jul_fine = "JUL_FINE";
 141 const char * const mi_lttng_loglevel_str_jul_finer = "JUL_FINER";
 142 const char * const mi_lttng_loglevel_str_jul_finest = "JUL_FINEST";
 143 const char * const mi_lttng_loglevel_str_jul_info = "JUL_INFO";
 144 const char * const mi_lttng_loglevel_str_jul_off = "JUL_OFF";
 145 const char * const mi_lttng_loglevel_str_jul_severe = "JUL_SEVERE";
 146 const char * const mi_lttng_loglevel_str_jul_warning = "JUL_WARNING";
 147
 148 /* String related to loglevel LOG4J */
 149 const char * const mi_lttng_loglevel_str_log4j_off = "LOG4J_OFF";
 150 const char * const mi_lttng_loglevel_str_log4j_fatal = "LOG4J_FATAL";
 151 const char * const mi_lttng_loglevel_str_log4j_error = "LOG4J_ERROR";
 152 const char * const mi_lttng_loglevel_str_log4j_warn = "LOG4J_WARN";
 153 const char * const mi_lttng_loglevel_str_log4j_info = "LOG4J_INFO";
 154 const char * const mi_lttng_loglevel_str_log4j_debug = "LOG4J_DEBUG";
 155 const char * const mi_lttng_loglevel_str_log4j_trace = "LOG4J_TRACE";
 156 const char * const mi_lttng_loglevel_str_log4j_all = "LOG4J_ALL";
 157
 158 /* String related to loglevel Python */
 159 const char * const mi_lttng_loglevel_str_python_critical = "PYTHON_CRITICAL";
 160 const char * const mi_lttng_loglevel_str_python_error = "PYTHON_ERROR";
 161 const char * const mi_lttng_loglevel_str_python_warning = "PYTHON_WARNING";
 162 const char * const mi_lttng_loglevel_str_python_info = "PYTHON_INFO";
 163 const char * const mi_lttng_loglevel_str_python_debug = "PYTHON_DEBUG";
 164 const char * const mi_lttng_loglevel_str_python_notset = "PYTHON_NOTSET";
 165
 166 /* String related to loglevel type */
 167 const char * const mi_lttng_loglevel_type_all = "ALL";
 168 const char * const mi_lttng_loglevel_type_range = "RANGE";
 169 const char * const mi_lttng_loglevel_type_single = "SINGLE";
 170 const char * const mi_lttng_loglevel_type_unknown = "UNKNOWN";
 171
 172 /* String related to a lttng_snapshot_output */
 173 const char * const mi_lttng_element_snapshot_ctrl_url = "ctrl_url";
 174 const char * const mi_lttng_element_snapshot_data_url = "data_url";
 175 const char * const mi_lttng_element_snapshot_max_size = "max_size";
 176 const char * const mi_lttng_element_snapshot_n_ptr = "n_ptr";
 177 const char * const mi_lttng_element_snapshot_session_name = "session_name";
 178 const char * const mi_lttng_element_snapshots = "snapshots";
 179
 180 /* String related to track/untrack command */
 181 const char * const mi_lttng_element_track_untrack_all_wildcard = "*";
 182
 183 /* Deprecated symbols preserved for ABI compatibility. */
 184 const char * const mi_lttng_context_type_perf_counter;
 185 const char * const mi_lttng_context_type_perf_cpu_counter;
 186 const char * const mi_lttng_context_type_perf_thread_counter;
 187 const char * const mi_lttng_element_track_untrack_pid_target;
 188 const char * const mi_lttng_element_track_untrack_targets;
 189 const char * const mi_lttng_element_calibrate;
 190 const char * const mi_lttng_element_calibrate_function;
 191 const char * const mi_lttng_element_command_calibrate;
 192
 193 /* This is a merge of jul loglevel and regular loglevel
 194  * Those should never overlap by definition
 195  * (see struct lttng_event loglevel)
 196  */
 197 LTTNG_HIDDEN
 198 const char *mi_lttng_loglevel_string(int value, enum lttng_domain_type domain)
 199 {
 200         switch (domain) {
 201         case LTTNG_DOMAIN_KERNEL:
 202         case LTTNG_DOMAIN_UST:
 203                 switch (value) {
 204                 case -1:
 205                         return mi_lttng_element_empty;
 206                 case LTTNG_LOGLEVEL_EMERG:
 207                         return mi_lttng_loglevel_str_emerg;
 208                 case LTTNG_LOGLEVEL_ALERT:
 209                         return mi_lttng_loglevel_str_alert;
 210                 case LTTNG_LOGLEVEL_CRIT:
 211                         return mi_lttng_loglevel_str_crit;
 212                 case LTTNG_LOGLEVEL_ERR:
 213                         return mi_lttng_loglevel_str_err;
 214                 case LTTNG_LOGLEVEL_WARNING:
 215                         return mi_lttng_loglevel_str_warning;
 216                 case LTTNG_LOGLEVEL_NOTICE:
 217                         return mi_lttng_loglevel_str_notice;
 218                 case LTTNG_LOGLEVEL_INFO:
 219                         return mi_lttng_loglevel_str_info;
 220                 case LTTNG_LOGLEVEL_DEBUG_SYSTEM:
 221                         return mi_lttng_loglevel_str_debug_system;
 222                 case LTTNG_LOGLEVEL_DEBUG_PROGRAM:
 223                         return mi_lttng_loglevel_str_debug_program;
 224                 case LTTNG_LOGLEVEL_DEBUG_PROCESS:
 225                         return mi_lttng_loglevel_str_debug_process;
 226                 case LTTNG_LOGLEVEL_DEBUG_MODULE:
 227                         return mi_lttng_loglevel_str_debug_module;
 228                 case LTTNG_LOGLEVEL_DEBUG_UNIT:
 229                         return mi_lttng_loglevel_str_debug_unit;
 230                 case LTTNG_LOGLEVEL_DEBUG_FUNCTION:
 231                         return mi_lttng_loglevel_str_debug_function;
 232                 case LTTNG_LOGLEVEL_DEBUG_LINE:
 233                         return mi_lttng_loglevel_str_debug_line;
 234                 case LTTNG_LOGLEVEL_DEBUG:
 235                         return mi_lttng_loglevel_str_debug;
 236                 default:
 237                         return mi_lttng_loglevel_str_unknown;
 238                 }
 239                 break;
 240         case LTTNG_DOMAIN_LOG4J:
 241                 switch (value) {
 242                 case -1:
 243                         return mi_lttng_element_empty;
 244                 case LTTNG_LOGLEVEL_LOG4J_OFF:
 245                         return mi_lttng_loglevel_str_log4j_off;
 246                 case LTTNG_LOGLEVEL_LOG4J_FATAL:
 247                         return mi_lttng_loglevel_str_log4j_fatal;
 248                 case LTTNG_LOGLEVEL_LOG4J_ERROR:
 249                         return mi_lttng_loglevel_str_log4j_error;
 250                 case LTTNG_LOGLEVEL_LOG4J_WARN:
 251                         return mi_lttng_loglevel_str_log4j_warn;
 252                 case LTTNG_LOGLEVEL_LOG4J_INFO:
 253                         return mi_lttng_loglevel_str_log4j_info;
 254                 case LTTNG_LOGLEVEL_LOG4J_DEBUG:
 255                         return mi_lttng_loglevel_str_log4j_debug;
 256                 case LTTNG_LOGLEVEL_LOG4J_TRACE:
 257                         return mi_lttng_loglevel_str_log4j_trace;
 258                 case LTTNG_LOGLEVEL_LOG4J_ALL:
 259                         return mi_lttng_loglevel_str_log4j_all;
 260                 default:
 261                         return mi_lttng_loglevel_str_unknown;
 262                 }
 263                 break;
 264         case LTTNG_DOMAIN_JUL:
 265                 switch (value) {
 266                 case -1:
 267                         return mi_lttng_element_empty;
 268                 case LTTNG_LOGLEVEL_JUL_OFF:
 269                         return mi_lttng_loglevel_str_jul_off;
 270                 case LTTNG_LOGLEVEL_JUL_SEVERE:
 271                         return mi_lttng_loglevel_str_jul_severe;
 272                 case LTTNG_LOGLEVEL_JUL_WARNING:
 273                         return mi_lttng_loglevel_str_jul_warning;
 274                 case LTTNG_LOGLEVEL_JUL_INFO:
 275                         return mi_lttng_loglevel_str_jul_info;
 276                 case LTTNG_LOGLEVEL_JUL_CONFIG:
 277                         return mi_lttng_loglevel_str_jul_config;
 278                 case LTTNG_LOGLEVEL_JUL_FINE:
 279                         return mi_lttng_loglevel_str_jul_fine;
 280                 case LTTNG_LOGLEVEL_JUL_FINER:
 281                         return mi_lttng_loglevel_str_jul_finer;
 282                 case LTTNG_LOGLEVEL_JUL_FINEST:
 283                         return mi_lttng_loglevel_str_jul_finest;
 284                 case LTTNG_LOGLEVEL_JUL_ALL:
 285                         return mi_lttng_loglevel_str_jul_all;
 286                 default:
 287                         return mi_lttng_loglevel_str_unknown;
 288                 }
 289                 break;
 290         case LTTNG_DOMAIN_PYTHON:
 291                 switch (value) {
 292                 case LTTNG_LOGLEVEL_PYTHON_CRITICAL:
 293                         return mi_lttng_loglevel_str_python_critical;
 294                 case LTTNG_LOGLEVEL_PYTHON_ERROR:
 295                         return mi_lttng_loglevel_str_python_error;
 296                 case LTTNG_LOGLEVEL_PYTHON_WARNING:
 297                         return mi_lttng_loglevel_str_python_warning;
 298                 case LTTNG_LOGLEVEL_PYTHON_INFO:
 299                         return mi_lttng_loglevel_str_python_info;
 300                 case LTTNG_LOGLEVEL_PYTHON_DEBUG:
 301                         return mi_lttng_loglevel_str_python_debug;
 302                 case LTTNG_LOGLEVEL_PYTHON_NOTSET:
 303                         return mi_lttng_loglevel_str_python_notset;
 304                 default:
 305                         return mi_lttng_loglevel_str_unknown;
 306                 }
 307                 break;
 308         default:
 309                 return mi_lttng_loglevel_str_unknown;
 310         }
 311 }
 312
 313 LTTNG_HIDDEN
 314 const char *mi_lttng_logleveltype_string(enum lttng_loglevel_type value)
 315 {
 316         switch (value) {
 317         case LTTNG_EVENT_LOGLEVEL_ALL:
 318                 return mi_lttng_loglevel_type_all;
 319         case LTTNG_EVENT_LOGLEVEL_RANGE:
 320                 return mi_lttng_loglevel_type_range;
 321         case LTTNG_EVENT_LOGLEVEL_SINGLE:
 322                 return mi_lttng_loglevel_type_single;
 323         default:
 324                 return mi_lttng_loglevel_type_unknown;
 325         }
 326 }
 327
 328 LTTNG_HIDDEN
 329 const char *mi_lttng_eventtype_string(enum lttng_event_type value)
 330 {
 331         switch (value) {
 332         case LTTNG_EVENT_ALL:
 333                 return config_event_type_all;
 334         case LTTNG_EVENT_TRACEPOINT:
 335                 return config_event_type_tracepoint;
 336         case LTTNG_EVENT_PROBE:
 337                 return config_event_type_probe;
 338         case LTTNG_EVENT_FUNCTION:
 339                 return config_event_type_function;
 340         case LTTNG_EVENT_FUNCTION_ENTRY:
 341                 return config_event_type_function_entry;
 342         case LTTNG_EVENT_SYSCALL:
 343                 return config_event_type_syscall;
 344         case LTTNG_EVENT_NOOP:
 345                 return config_event_type_noop;
 346         default:
 347                 return mi_lttng_element_empty;
 348         }
 349 }
 350
 351 static
 352 const char *mi_lttng_event_contexttype_string(enum lttng_event_context_type val)
 353 {
 354         switch (val) {
 355         case LTTNG_EVENT_CONTEXT_PID:
 356                 return config_event_context_pid;
 357         case LTTNG_EVENT_CONTEXT_PROCNAME:
 358                 return config_event_context_procname;
 359         case LTTNG_EVENT_CONTEXT_PRIO:
 360                 return config_event_context_prio;
 361         case LTTNG_EVENT_CONTEXT_NICE:
 362                 return config_event_context_nice;
 363         case LTTNG_EVENT_CONTEXT_VPID:
 364                 return config_event_context_vpid;
 365         case LTTNG_EVENT_CONTEXT_TID:
 366                 return config_event_context_tid;
 367         case LTTNG_EVENT_CONTEXT_VTID:
 368                 return config_event_context_vtid;
 369         case LTTNG_EVENT_CONTEXT_PPID:
 370                 return config_event_context_ppid;
 371         case LTTNG_EVENT_CONTEXT_VPPID:
 372                 return config_event_context_vppid;
 373         case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
 374                 return config_event_context_pthread_id;
 375         case LTTNG_EVENT_CONTEXT_HOSTNAME:
 376                 return config_event_context_hostname;
 377         case LTTNG_EVENT_CONTEXT_IP:
 378                 return config_event_context_ip;
 379         case LTTNG_EVENT_CONTEXT_INTERRUPTIBLE:
 380                 return config_event_context_interruptible;
 381         case LTTNG_EVENT_CONTEXT_PREEMPTIBLE:
 382                 return config_event_context_preemptible;
 383         case LTTNG_EVENT_CONTEXT_NEED_RESCHEDULE:
 384                 return config_event_context_need_reschedule;
 385         case LTTNG_EVENT_CONTEXT_MIGRATABLE:
 386                 return config_event_context_migratable;
 387         default:
 388                 return NULL;
 389         }
 390 }
 391
 392 LTTNG_HIDDEN
 393 const char *mi_lttng_eventfieldtype_string(enum lttng_event_field_type val)
 394 {
 395         switch (val) {
 396         case(LTTNG_EVENT_FIELD_INTEGER):
 397                 return mi_lttng_element_type_integer;
 398         case(LTTNG_EVENT_FIELD_ENUM):
 399                 return mi_lttng_element_type_enum;
 400         case(LTTNG_EVENT_FIELD_FLOAT):
 401                 return mi_lttng_element_type_float;
 402         case(LTTNG_EVENT_FIELD_STRING):
 403                 return mi_lttng_element_type_string;
 404         default:
 405                 return mi_lttng_element_type_other;
 406         }
 407 }
 408
 409 LTTNG_HIDDEN
 410 const char *mi_lttng_domaintype_string(enum lttng_domain_type value)
 411 {
 412         /* Note: This is a *duplicate* of get_domain_str from bin/lttng/utils.c */
 413         switch (value) {
 414         case LTTNG_DOMAIN_KERNEL:
 415                 return config_domain_type_kernel;
 416         case LTTNG_DOMAIN_UST:
 417                 return config_domain_type_ust;
 418         case LTTNG_DOMAIN_JUL:
 419                 return config_domain_type_jul;
 420         case LTTNG_DOMAIN_LOG4J:
 421                 return config_domain_type_log4j;
 422         case LTTNG_DOMAIN_PYTHON:
 423                 return config_domain_type_python;
 424         default:
 425                 /* Should not have an unknown domain */
 426                 assert(0);
 427                 return NULL;
 428         }
 429 }
 430
 431 LTTNG_HIDDEN
 432 const char *mi_lttng_buffertype_string(enum lttng_buffer_type value)
 433 {
 434         switch (value) {
 435         case LTTNG_BUFFER_PER_PID:
 436                 return config_buffer_type_per_pid;
 437         case LTTNG_BUFFER_PER_UID:
 438                 return config_buffer_type_per_uid;
 439         case LTTNG_BUFFER_GLOBAL:
 440                 return config_buffer_type_global;
 441         default:
 442                 /* Should not have an unknow buffer type */
 443                 assert(0);
 444                 return NULL;
 445         }
 446 }
 447
 448 LTTNG_HIDDEN
 449 struct mi_writer *mi_lttng_writer_create(int fd_output, int mi_output_type)
 450 {
 451         struct mi_writer *mi_writer;
 452
 453         mi_writer = zmalloc(sizeof(struct mi_writer));
 454         if (!mi_writer) {
 455                 PERROR("zmalloc mi_writer_create");
 456                 goto end;
 457         }
 458         if (mi_output_type == LTTNG_MI_XML) {
 459                 mi_writer->writer = config_writer_create(fd_output, 0);
 460                 if (!mi_writer->writer) {
 461                         goto err_destroy;
 462                 }
 463                 mi_writer->type = LTTNG_MI_XML;
 464         } else {
 465                 goto err_destroy;
 466         }
 467
 468 end:
 469         return mi_writer;
 470
 471 err_destroy:
 472         free(mi_writer);
 473         return NULL;
 474 }
 475
 476 LTTNG_HIDDEN
 477 int mi_lttng_writer_destroy(struct mi_writer *writer)
 478 {
 479         int ret;
 480
 481         if (!writer) {
 482                 ret = -EINVAL;
 483                 goto end;
 484         }
 485
 486         ret = config_writer_destroy(writer->writer);
 487         if (ret < 0) {
 488                 goto end;
 489         }
 490
 491         free(writer);
 492 end:
 493         return ret;
 494 }
 495
 496 LTTNG_HIDDEN
 497 int mi_lttng_writer_command_open(struct mi_writer *writer, const char *command)
 498 {
 499         int ret;
 500
 501         /*
 502          * A command is always the MI's root node, it must declare the current
 503          * namespace and schema URIs and the schema's version.
 504          */
 505         ret = config_writer_open_element(writer->writer,
 506                         mi_lttng_element_command);
 507         if (ret) {
 508                 goto end;
 509         }
 510
 511         ret = config_writer_write_attribute(writer->writer,
 512                         mi_lttng_xmlns, DEFAULT_LTTNG_MI_NAMESPACE);
 513         if (ret) {
 514                 goto end;
 515         }
 516
 517         ret = config_writer_write_attribute(writer->writer,
 518                         mi_lttng_xmlns_xsi, mi_lttng_w3_schema_uri);
 519         if (ret) {
 520                 goto end;
 521         }
 522
 523         ret = config_writer_write_attribute(writer->writer,
 524                         mi_lttng_schema_location,
 525                         mi_lttng_schema_location_uri);
 526         if (ret) {
 527                 goto end;
 528         }
 529
 530         ret = config_writer_write_attribute(writer->writer,
 531                         mi_lttng_schema_version,
 532                         mi_lttng_schema_version_value);
 533         if (ret) {
 534                 goto end;
 535         }
 536
 537         ret = mi_lttng_writer_write_element_string(writer,
 538                         mi_lttng_element_command_name, command);
 539 end:
 540         return ret;
 541 }
 542
 543 LTTNG_HIDDEN
 544 int mi_lttng_writer_command_close(struct mi_writer *writer)
 545 {
 546         return mi_lttng_writer_close_element(writer);
 547 }
 548
 549 LTTNG_HIDDEN
 550 int mi_lttng_writer_open_element(struct mi_writer *writer,
 551                 const char *element_name)
 552 {
 553         return config_writer_open_element(writer->writer, element_name);
 554 }
 555
 556 LTTNG_HIDDEN
 557 int mi_lttng_writer_close_element(struct mi_writer *writer)
 558 {
 559         return config_writer_close_element(writer->writer);
 560 }
 561
 562 LTTNG_HIDDEN
 563 int mi_lttng_close_multi_element(struct mi_writer *writer,
 564                 unsigned int nb_element)
 565 {
 566         int ret, i;
 567
 568         if (nb_element < 1) {
 569                 ret = 0;
 570                 goto end;
 571         }
 572         for (i = 0; i < nb_element; i++) {
 573                 ret = mi_lttng_writer_close_element(writer);
 574                 if (ret) {
 575                         goto end;
 576                 }
 577         }
 578 end:
 579         return ret;
 580 }
 581
 582 LTTNG_HIDDEN
 583 int mi_lttng_writer_write_element_unsigned_int(struct mi_writer *writer,
 584                 const char *element_name, uint64_t value)
 585 {
 586         return config_writer_write_element_unsigned_int(writer->writer,
 587                         element_name, value);
 588 }
 589
 590 LTTNG_HIDDEN
 591 int mi_lttng_writer_write_element_signed_int(struct mi_writer *writer,
 592                 const char *element_name, int64_t value)
 593 {
 594         return config_writer_write_element_signed_int(writer->writer,
 595                         element_name, value);
 596 }
 597
 598 LTTNG_HIDDEN
 599 int mi_lttng_writer_write_element_bool(struct mi_writer *writer,
 600                 const char *element_name, int value)
 601 {
 602         return config_writer_write_element_bool(writer->writer,
 603                         element_name, value);
 604 }
 605
 606 LTTNG_HIDDEN
 607 int mi_lttng_writer_write_element_string(struct mi_writer *writer,
 608                 const char *element_name, const char *value)
 609 {
 610         return config_writer_write_element_string(writer->writer,
 611                         element_name, value);
 612 }
 613
 614 LTTNG_HIDDEN
 615 int mi_lttng_version(struct mi_writer *writer, struct mi_lttng_version *version,
 616         const char *lttng_description, const char *lttng_license)
 617 {
 618         int ret;
 619
 620         /* Open version */
 621         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_version);
 622         if (ret) {
 623                 goto end;
 624         }
 625
 626         /* Version string (contain info like rc etc.) */
 627         ret = mi_lttng_writer_write_element_string(writer,
 628                         mi_lttng_element_version_str, version->version);
 629         if (ret) {
 630                 goto end;
 631         }
 632
 633         /* Major version number */
 634         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 635                         mi_lttng_element_version_major, version->version_major);
 636         if (ret) {
 637                 goto end;
 638         }
 639
 640         /* Minor version number */
 641         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 642                         mi_lttng_element_version_minor, version->version_minor);
 643         if (ret) {
 644                 goto end;
 645         }
 646
 647         /* Commit version number */
 648         ret = mi_lttng_writer_write_element_string(writer,
 649                         mi_lttng_element_version_commit, version->version_commit);
 650         if (ret) {
 651                 goto end;
 652         }
 653
 654         /* Patch number */
 655         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 656                         mi_lttng_element_version_patch_level, version->version_patchlevel);
 657         if (ret) {
 658                 goto end;
 659         }
 660
 661         /* Name of the version */
 662         ret = mi_lttng_writer_write_element_string(writer,
 663                         config_element_name, version->version_name);
 664         if (ret) {
 665                 goto end;
 666         }
 667
 668         /* Description mostly related to beer... */
 669         ret = mi_lttng_writer_write_element_string(writer,
 670                         mi_lttng_element_version_description, lttng_description);
 671         if (ret) {
 672                 goto end;
 673         }
 674
 675         /* url */
 676         ret = mi_lttng_writer_write_element_string(writer,
 677                         mi_lttng_element_version_web, version->package_url);
 678         if (ret) {
 679                 goto end;
 680         }
 681
 682         /* License: free as in free beer...no...*speech* */
 683         ret = mi_lttng_writer_write_element_string(writer,
 684                         mi_lttng_element_version_license, lttng_license);
 685         if (ret) {
 686                 goto end;
 687         }
 688
 689         /* Close version element */
 690         ret = mi_lttng_writer_close_element(writer);
 691
 692 end:
 693         return ret;
 694 }
 695
 696 LTTNG_HIDDEN
 697 int mi_lttng_sessions_open(struct mi_writer *writer)
 698 {
 699         return mi_lttng_writer_open_element(writer, config_element_sessions);
 700 }
 701
 702 LTTNG_HIDDEN
 703 int mi_lttng_session(struct mi_writer *writer,
 704                 struct lttng_session *session, int is_open)
 705 {
 706         int ret;
 707
 708         assert(session);
 709
 710         /* Open sessions element */
 711         ret = mi_lttng_writer_open_element(writer,
 712                         config_element_session);
 713         if (ret) {
 714                 goto end;
 715         }
 716
 717         /* Name of the session */
 718         ret = mi_lttng_writer_write_element_string(writer,
 719                         config_element_name, session->name);
 720         if (ret) {
 721                 goto end;
 722         }
 723
 724         /* Path */
 725         ret = mi_lttng_writer_write_element_string(writer,
 726                         config_element_path, session->path);
 727         if (ret) {
 728                 goto end;
 729         }
 730
 731         /* Enabled ? */
 732         ret = mi_lttng_writer_write_element_bool(writer,
 733                         config_element_enabled, session->enabled);
 734         if (ret) {
 735                 goto end;
 736         }
 737
 738         /* Snapshot mode */
 739         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 740                         config_element_snapshot_mode, session->snapshot_mode);
 741         if (ret) {
 742                 goto end;
 743         }
 744
 745         /* Live timer interval in usec */
 746         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 747                         config_element_live_timer_interval,
 748                         session->live_timer_interval);
 749         if (ret) {
 750                 goto end;
 751         }
 752
 753         if (!is_open) {
 754                 /* Closing session element */
 755                 ret = mi_lttng_writer_close_element(writer);
 756         }
 757 end:
 758         return ret;
 759
 760 }
 761
 762 LTTNG_HIDDEN
 763 int mi_lttng_domains_open(struct mi_writer *writer)
 764 {
 765         return mi_lttng_writer_open_element(writer, config_element_domains);
 766 }
 767
 768 LTTNG_HIDDEN
 769 int mi_lttng_domain(struct mi_writer *writer,
 770                 struct lttng_domain *domain, int is_open)
 771 {
 772         int ret = 0;
 773         const char *str_domain;
 774         const char *str_buffer;
 775
 776         assert(domain);
 777
 778         /* Open domain element */
 779         ret = mi_lttng_writer_open_element(writer, config_element_domain);
 780         if (ret) {
 781                 goto end;
 782         }
 783
 784         /* Domain Type */
 785         str_domain = mi_lttng_domaintype_string(domain->type);
 786         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
 787                         str_domain);
 788         if (ret) {
 789                 goto end;
 790         }
 791
 792         /* Buffer Type */
 793         str_buffer= mi_lttng_buffertype_string(domain->buf_type);
 794         ret = mi_lttng_writer_write_element_string(writer,
 795                         config_element_buffer_type, str_buffer);
 796         if (ret) {
 797                 goto end;
 798         }
 799
 800         /* TODO: union  attr
 801          * This union is not currently used and was added for
 802          * future ust domain support.
 803          * Date: 25-06-2014
 804          * */
 805
 806         if (!is_open) {
 807                 /* Closing domain element */
 808                 ret = mi_lttng_writer_close_element(writer);
 809         }
 810
 811 end:
 812         return ret;
 813
 814 }
 815
 816 LTTNG_HIDDEN
 817 int mi_lttng_channels_open(struct mi_writer *writer)
 818 {
 819         return mi_lttng_writer_open_element(writer, config_element_channels);
 820 }
 821
 822 LTTNG_HIDDEN
 823 int mi_lttng_channel(struct mi_writer *writer,
 824                 struct lttng_channel *channel, int is_open)
 825 {
 826         int ret = 0;
 827
 828         assert(channel);
 829
 830         /* Opening channel element */
 831         ret = mi_lttng_writer_open_element(writer, config_element_channel);
 832         if (ret) {
 833                 goto end;
 834         }
 835
 836         /* Name */
 837         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
 838                         channel->name);
 839         if (ret) {
 840                 goto end;
 841         }
 842
 843         /* Enabled ? */
 844         ret = mi_lttng_writer_write_element_bool(writer,
 845                         config_element_enabled, channel->enabled);
 846         if (ret) {
 847                 goto end;
 848         }
 849
 850         /* Attribute */
 851         ret = mi_lttng_channel_attr(writer, &channel->attr);
 852         if (ret) {
 853                 goto end;
 854         }
 855
 856         if (!is_open) {
 857                 /* Closing channel element */
 858                 ret = mi_lttng_writer_close_element(writer);
 859                 if (ret) {
 860                         goto end;
 861                 }
 862         }
 863 end:
 864         return ret;
 865 }
 866
 867 LTTNG_HIDDEN
 868 int mi_lttng_channel_attr(struct mi_writer *writer,
 869                 struct lttng_channel_attr *attr)
 870 {
 871         int ret = 0;
 872         struct lttng_channel *chan = caa_container_of(attr,
 873                         struct lttng_channel, attr);
 874         uint64_t discarded_events, lost_packets, monitor_timer_interval;
 875         int64_t blocking_timeout;
 876
 877         assert(attr);
 878
 879         ret = lttng_channel_get_discarded_event_count(chan, &discarded_events);
 880         if (ret) {
 881                 goto end;
 882         }
 883
 884         ret = lttng_channel_get_lost_packet_count(chan, &lost_packets);
 885         if (ret) {
 886                 goto end;
 887         }
 888
 889         ret = lttng_channel_get_monitor_timer_interval(chan,
 890                         &monitor_timer_interval);
 891         if (ret) {
 892                 goto end;
 893         }
 894
 895         ret = lttng_channel_get_blocking_timeout(chan,
 896                         &blocking_timeout);
 897         if (ret) {
 898                 goto end;
 899         }
 900
 901         /* Opening Attributes */
 902         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
 903         if (ret) {
 904                 goto end;
 905         }
 906
 907         /* Overwrite */
 908         ret = mi_lttng_writer_write_element_string(writer,
 909                 config_element_overwrite_mode,
 910                 attr->overwrite ? config_overwrite_mode_overwrite :
 911                         config_overwrite_mode_discard);
 912         if (ret) {
 913                 goto end;
 914         }
 915
 916         /* Sub buffer size in byte */
 917         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 918                 config_element_subbuf_size, attr->subbuf_size);
 919         if (ret) {
 920                 goto end;
 921         }
 922
 923         /* Number of subbuffer (power of two) */
 924         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 925                 config_element_num_subbuf,
 926                 attr->num_subbuf);
 927         if (ret) {
 928                 goto end;
 929         }
 930
 931         /* Switch timer interval in usec */
 932         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 933                 config_element_switch_timer_interval,
 934                 attr->switch_timer_interval);
 935         if (ret) {
 936                 goto end;
 937         }
 938
 939         /* Read timer interval in usec */
 940         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 941                 config_element_read_timer_interval,
 942                 attr->read_timer_interval);
 943         if (ret) {
 944                 goto end;
 945         }
 946
 947         /* Monitor timer interval in usec */
 948         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 949                 config_element_monitor_timer_interval,
 950                 monitor_timer_interval);
 951         if (ret) {
 952                 goto end;
 953         }
 954
 955         /* Retry timeout in usec */
 956         ret = mi_lttng_writer_write_element_signed_int(writer,
 957                 config_element_blocking_timeout,
 958                 blocking_timeout);
 959         if (ret) {
 960                 goto end;
 961         }
 962
 963         /* Event output */
 964         ret = mi_lttng_writer_write_element_string(writer,
 965                 config_element_output_type,
 966                 attr->output == LTTNG_EVENT_SPLICE ?
 967                 config_output_type_splice : config_output_type_mmap);
 968         if (ret) {
 969                 goto end;
 970         }
 971
 972         /* Tracefile size in bytes */
 973         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 974                 config_element_tracefile_size, attr->tracefile_size);
 975         if (ret) {
 976                 goto end;
 977         }
 978
 979         /* Count of tracefiles */
 980         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 981                 config_element_tracefile_count,
 982                 attr->tracefile_count);
 983         if (ret) {
 984                 goto end;
 985         }
 986
 987         /* Live timer interval in usec*/
 988         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 989                 config_element_live_timer_interval,
 990                 attr->live_timer_interval);
 991         if (ret) {
 992                 goto end;
 993         }
 994
 995         /* Discarded events */
 996         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 997                 config_element_discarded_events,
 998                 discarded_events);
 999         if (ret) {
1000                 goto end;
1001         }
1002
1003         /* Lost packets */
1004         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1005                 config_element_lost_packets,
1006                 lost_packets);
1007         if (ret) {
1008                 goto end;
1009         }
1010
1011         /* Closing attributes */
1012         ret = mi_lttng_writer_close_element(writer);
1013         if (ret) {
1014                 goto end;
1015         }
1016 end:
1017         return ret;
1018
1019 }
1020
1021 LTTNG_HIDDEN
1022 int mi_lttng_event_common_attributes(struct mi_writer *writer,
1023                 struct lttng_event *event)
1024 {
1025         int ret;
1026         const char *filter_expression;
1027
1028         /* Open event element */
1029         ret = mi_lttng_writer_open_element(writer, config_element_event);
1030         if (ret) {
1031                 goto end;
1032         }
1033
1034         /* Event name */
1035         ret = mi_lttng_writer_write_element_string(writer,
1036                         config_element_name, event->name);
1037         if (ret) {
1038                 goto end;
1039         }
1040
1041         /* Event type */
1042         ret = mi_lttng_writer_write_element_string(writer,
1043                         config_element_type, mi_lttng_eventtype_string(event->type));
1044         if (ret) {
1045                 goto end;
1046         }
1047
1048         /* Is event enabled */
1049         ret = mi_lttng_writer_write_element_bool(writer,
1050                         config_element_enabled, event->enabled);
1051         if (ret) {
1052                 goto end;
1053         }
1054
1055         /* Event filter expression */
1056         ret = lttng_event_get_filter_expression(event, &filter_expression);
1057         if (ret) {
1058                 goto end;
1059         }
1060
1061         if (filter_expression) {
1062                 ret = mi_lttng_writer_write_element_string(writer,
1063                                 config_element_filter_expression,
1064                                 filter_expression);
1065                 if (ret) {
1066                         goto end;
1067                 }
1068         }
1069
1070 end:
1071         return ret;
1072 }
1073
1074 static int write_event_exclusions(struct mi_writer *writer,
1075                 struct lttng_event *event)
1076 {
1077         int i;
1078         int ret;
1079         int exclusion_count;
1080
1081         /* Open event exclusions */
1082         ret = mi_lttng_writer_open_element(writer, config_element_exclusions);
1083         if (ret) {
1084                 goto end;
1085         }
1086
1087         exclusion_count = lttng_event_get_exclusion_name_count(event);
1088         if (exclusion_count < 0) {
1089                 ret = exclusion_count;
1090                 goto end;
1091         }
1092
1093         for (i = 0; i < exclusion_count; i++) {
1094                 const char *name;
1095
1096                 ret = lttng_event_get_exclusion_name(event, i, &name);
1097                 if (ret) {
1098                         /* Close exclusions */
1099                         mi_lttng_writer_close_element(writer);
1100                         goto end;
1101                 }
1102
1103                 ret = mi_lttng_writer_write_element_string(writer,
1104                                 config_element_exclusion, name);
1105                 if (ret) {
1106                         /* Close exclusions */
1107                         mi_lttng_writer_close_element(writer);
1108                         goto end;
1109                 }
1110         }
1111
1112         /* Close exclusions */
1113         ret = mi_lttng_writer_close_element(writer);
1114
1115 end:
1116         return ret;
1117 }
1118
1119 LTTNG_HIDDEN
1120 int mi_lttng_event_tracepoint_loglevel(struct mi_writer *writer,
1121                 struct lttng_event *event, enum lttng_domain_type domain)
1122 {
1123         int ret;
1124
1125         /* Event loglevel */
1126         ret = mi_lttng_writer_write_element_string(writer,
1127                         config_element_loglevel,
1128                         mi_lttng_loglevel_string(event->loglevel, domain));
1129         if (ret) {
1130                 goto end;
1131         }
1132
1133         /* Log level type */
1134         ret = mi_lttng_writer_write_element_string(writer,
1135                         config_element_loglevel_type,
1136                         mi_lttng_logleveltype_string(event->loglevel_type));
1137         if (ret) {
1138                 goto end;
1139         }
1140
1141         /* Event exclusions */
1142         ret = write_event_exclusions(writer, event);
1143
1144 end:
1145         return ret;
1146 }
1147
1148 LTTNG_HIDDEN
1149 int mi_lttng_event_tracepoint_no_loglevel(struct mi_writer *writer,
1150                 struct lttng_event *event)
1151 {
1152         /* event exclusion filter */
1153         return write_event_exclusions(writer, event);
1154 }
1155
1156 LTTNG_HIDDEN
1157 int mi_lttng_event_function_probe(struct mi_writer *writer,
1158                 struct lttng_event *event)
1159 {
1160         int ret;
1161
1162         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1163         if (ret) {
1164                 goto end;
1165         }
1166
1167         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1168         if (ret) {
1169                 goto end;
1170         }
1171
1172         if (event->attr.probe.addr != 0) {
1173                 /* event probe address */
1174                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1175                                 config_element_address, event->attr.probe.addr);
1176                 if (ret) {
1177                         goto end;
1178                 }
1179         } else {
1180                 /* event probe offset */
1181                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1182                                 config_element_offset, event->attr.probe.offset);
1183                 if (ret) {
1184                         goto end;
1185                 }
1186
1187                 /* event probe symbol_name */
1188                 ret = mi_lttng_writer_write_element_string(writer,
1189                                 config_element_symbol_name, event->attr.probe.symbol_name);
1190                 if (ret) {
1191                         goto end;
1192                 }
1193         }
1194
1195         /* Close probe_attributes and attributes */
1196         ret = mi_lttng_close_multi_element(writer, 2);
1197 end:
1198         return ret;
1199 }
1200
1201 LTTNG_HIDDEN
1202 int mi_lttng_event_function_entry(struct mi_writer *writer,
1203                 struct lttng_event *event)
1204 {
1205         int ret;
1206
1207         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1208         if (ret) {
1209                 goto end;
1210         }
1211
1212         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1213         if (ret) {
1214                 goto end;
1215         }
1216
1217         /* event probe symbol_name */
1218         ret = mi_lttng_writer_write_element_string(writer,
1219                         config_element_symbol_name, event->attr.ftrace.symbol_name);
1220         if (ret) {
1221                 goto end;
1222         }
1223
1224         /* Close function_attributes and attributes */
1225         ret = mi_lttng_close_multi_element(writer, 2);
1226 end:
1227         return ret;
1228 }
1229
1230 LTTNG_HIDDEN
1231 int mi_lttng_events_open(struct mi_writer *writer)
1232 {
1233         return mi_lttng_writer_open_element(writer, config_element_events);
1234 }
1235
1236 LTTNG_HIDDEN
1237 int mi_lttng_event(struct mi_writer *writer,
1238                 struct lttng_event *event, int is_open, enum lttng_domain_type domain)
1239 {
1240         int ret;
1241
1242         ret = mi_lttng_event_common_attributes(writer, event);
1243         if (ret) {
1244                 goto end;
1245         }
1246
1247         switch (event->type) {
1248         case LTTNG_EVENT_TRACEPOINT:
1249         {
1250                 if (event->loglevel != -1) {
1251                         ret = mi_lttng_event_tracepoint_loglevel(writer, event, domain);
1252                 } else {
1253                         ret = mi_lttng_event_tracepoint_no_loglevel(writer, event);
1254                 }
1255                 break;
1256         }
1257         case LTTNG_EVENT_FUNCTION:
1258                 /* Fallthrough */
1259         case LTTNG_EVENT_PROBE:
1260                 ret = mi_lttng_event_function_probe(writer, event);
1261                 break;
1262         case LTTNG_EVENT_FUNCTION_ENTRY:
1263                 ret = mi_lttng_event_function_entry(writer, event);
1264                 break;
1265         case LTTNG_EVENT_ALL:
1266                 /* Fallthrough */
1267         default:
1268                 break;
1269         }
1270
1271         if (!is_open) {
1272                 ret = mi_lttng_writer_close_element(writer);
1273         }
1274
1275 end:
1276         return ret;
1277 }
1278
1279 LTTNG_HIDDEN
1280 int mi_lttng_trackers_open(struct mi_writer *writer)
1281 {
1282         return mi_lttng_writer_open_element(writer, config_element_trackers);
1283 }
1284
1285 LTTNG_HIDDEN
1286 int mi_lttng_pid_tracker_open(struct mi_writer *writer)
1287 {
1288         int ret;
1289
1290         /* Open element pid_tracker */
1291         ret = mi_lttng_writer_open_element(writer, config_element_pid_tracker);
1292         if (ret) {
1293                 goto end;
1294         }
1295
1296         /* Open targets element */
1297         ret = mi_lttng_targets_open(writer);
1298 end:
1299         return ret;
1300 }
1301
1302 LTTNG_HIDDEN
1303 int mi_lttng_pids_open(struct mi_writer *writer)
1304 {
1305         return mi_lttng_writer_open_element(writer, config_element_pids);
1306 }
1307
1308 /*
1309  * TODO: move the listing of pid for user agent to process semantic on
1310  * mi api bump. The use of process element break the mi api.
1311  */
1312 LTTNG_HIDDEN
1313 int mi_lttng_pid(struct mi_writer *writer, pid_t pid , const char *name,
1314                 int is_open)
1315 {
1316         int ret;
1317
1318         /* Open pid process */
1319         ret = mi_lttng_writer_open_element(writer, config_element_pid);
1320         if (ret) {
1321                 goto end;
1322         }
1323
1324         /* Writing pid number */
1325         ret = mi_lttng_writer_write_element_signed_int(writer,
1326                         mi_lttng_element_pid_id, (int)pid);
1327         if (ret) {
1328                 goto end;
1329         }
1330
1331         /* Writing name of the process */
1332         if (name) {
1333                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1334                                 name);
1335                 if (ret) {
1336                         goto end;
1337                 }
1338         }
1339
1340         if (!is_open) {
1341                 /* Closing Pid */
1342                 ret = mi_lttng_writer_close_element(writer);
1343         }
1344
1345 end:
1346         return ret;
1347 }
1348
1349 LTTNG_HIDDEN
1350 int mi_lttng_targets_open(struct mi_writer *writer)
1351 {
1352         return mi_lttng_writer_open_element(writer,
1353                         config_element_targets);
1354 }
1355
1356 LTTNG_HIDDEN
1357 int mi_lttng_pid_target(struct mi_writer *writer, pid_t pid, int is_open)
1358 {
1359         int ret;
1360
1361         ret = mi_lttng_writer_open_element(writer,
1362                         config_element_target_pid);
1363         if (ret) {
1364                 goto end;
1365         }
1366
1367         /* Writing pid number
1368          * Special case for element all on track untrack command
1369          * All pid is represented as wildcard *
1370          */
1371         if ((int) pid == -1) {
1372                 ret = mi_lttng_writer_write_element_string(writer,
1373                                 config_element_pid,
1374                                 mi_lttng_element_track_untrack_all_wildcard);
1375         } else {
1376                 ret = mi_lttng_writer_write_element_signed_int(writer,
1377                                 config_element_pid, (int) pid);
1378         }
1379         if (ret) {
1380                 goto end;
1381         }
1382
1383         if (!is_open) {
1384                 ret = mi_lttng_writer_close_element(writer);
1385                 if (ret) {
1386                         goto end;
1387                 }
1388         }
1389
1390 end:
1391         return ret;
1392 }
1393
1394 LTTNG_HIDDEN
1395 int mi_lttng_event_fields_open(struct mi_writer *writer)
1396 {
1397         return mi_lttng_writer_open_element(writer, mi_lttng_element_event_fields);
1398 }
1399
1400 LTTNG_HIDDEN
1401 int mi_lttng_event_field(struct mi_writer *writer,
1402                 struct lttng_event_field *field)
1403 {
1404         int ret;
1405
1406         if (!field->field_name[0]) {
1407                 ret = 0;
1408                 goto end;
1409         }
1410
1411         /* Open field */
1412         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_event_field);
1413         if (ret) {
1414                 goto end;
1415         }
1416
1417         if (!field->field_name[0]) {
1418                 goto close;
1419         }
1420
1421         /* Name */
1422         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1423                         field->field_name);
1424         if (ret) {
1425                 goto end;
1426         }
1427
1428         /* Type */
1429         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1430                         mi_lttng_eventfieldtype_string(field->type));
1431         if (ret) {
1432                 goto end;
1433         }
1434
1435         /* nowrite  */
1436         ret = mi_lttng_writer_write_element_signed_int(writer,
1437                         mi_lttng_element_nowrite, field->nowrite);
1438         if (ret) {
1439                 goto end;
1440         }
1441
1442 close:
1443         /* Close field element */
1444         ret = mi_lttng_writer_close_element(writer);
1445
1446 end:
1447         return ret;
1448 }
1449
1450 LTTNG_HIDDEN
1451 int mi_lttng_perf_counter_context(struct mi_writer *writer,
1452                 struct lttng_event_perf_counter_ctx  *perf_context)
1453 {
1454         int ret;
1455
1456         /* Open perf_counter_context */
1457         ret = mi_lttng_writer_open_element(writer,
1458                         mi_lttng_element_perf_counter_context);
1459         if (ret) {
1460                 goto end;
1461         }
1462
1463         /* Type */
1464         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1465                         config_element_type, perf_context->type);
1466         if (ret) {
1467                 goto end;
1468         }
1469
1470         /* Config */
1471         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1472                         config_element_config, perf_context->config);
1473         if (ret) {
1474                 goto end;
1475         }
1476
1477         /* Name of the perf counter */
1478         ret = mi_lttng_writer_write_element_string(writer,
1479                         config_element_name, perf_context->name);
1480         if (ret) {
1481                 goto end;
1482         }
1483
1484         /* Close perf_counter_context */
1485         ret = mi_lttng_writer_close_element(writer);
1486 end:
1487         return ret;
1488 }
1489
1490 static
1491 int mi_lttng_app_context(struct mi_writer *writer,
1492                 const char *provider_name, const char *ctx_name)
1493 {
1494         int ret;
1495
1496         /* Open app */
1497         ret = mi_lttng_writer_open_element(writer,
1498                         config_element_context_app);
1499         if (ret) {
1500                 goto end;
1501         }
1502
1503         /* provider_name */
1504         ret = mi_lttng_writer_write_element_string(writer,
1505                         config_element_context_app_provider_name,
1506                         provider_name);
1507         if (ret) {
1508                 goto end;
1509         }
1510
1511         /* ctx_name */
1512         ret = mi_lttng_writer_write_element_string(writer,
1513                         config_element_context_app_ctx_name, ctx_name);
1514         if (ret) {
1515                 goto end;
1516         }
1517
1518         /* Close app */
1519         ret = mi_lttng_writer_close_element(writer);
1520 end:
1521         return ret;
1522 }
1523
1524 LTTNG_HIDDEN
1525 int mi_lttng_context(struct mi_writer *writer,
1526                 struct lttng_event_context *context, int is_open)
1527 {
1528         int ret;
1529
1530         /* Open context */
1531         ret = mi_lttng_writer_open_element(writer , config_element_context);
1532         if (ret) {
1533                 goto end;
1534         }
1535
1536         /* Special case for PERF_*_COUNTER
1537          * print the lttng_event_perf_counter_ctx*/
1538         switch (context->ctx) {
1539         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
1540         case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
1541         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
1542         {
1543                 struct lttng_event_perf_counter_ctx *perf_context =
1544                                 &context->u.perf_counter;
1545                 ret =  mi_lttng_perf_counter_context(writer, perf_context);
1546                 if (ret) {
1547                         goto end;
1548                 }
1549                 break;
1550         }
1551         case LTTNG_EVENT_CONTEXT_APP_CONTEXT:
1552         {
1553                 ret = mi_lttng_app_context(writer,
1554                                 context->u.app_ctx.provider_name,
1555                                 context->u.app_ctx.ctx_name);
1556                 if (ret) {
1557                         goto end;
1558                 }
1559                 break;
1560         }
1561         default:
1562         {
1563                 const char *type_string = mi_lttng_event_contexttype_string(
1564                                 context->ctx);
1565                 if (!type_string) {
1566                         ret = -LTTNG_ERR_INVALID;
1567                         goto end;
1568                 }
1569
1570                 /* Print context type */
1571                 ret = mi_lttng_writer_write_element_string(writer,
1572                                 config_element_type, type_string);
1573                 break;
1574         }
1575         }
1576
1577         /* Close context */
1578         if (!is_open) {
1579                 ret = mi_lttng_writer_close_element(writer);
1580         }
1581
1582 end:
1583         return ret;
1584 }
1585
1586 LTTNG_HIDDEN
1587 int mi_lttng_snapshot_output_session_name(struct mi_writer *writer,
1588                 const char *session_name)
1589 {
1590         int ret;
1591
1592         /* Open session element */
1593         ret = mi_lttng_writer_open_element(writer, config_element_session);
1594         if (ret) {
1595                 goto end;
1596         }
1597
1598         /* Snapshot output list for current session name */
1599         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1600                         session_name);
1601         if (ret) {
1602                 goto end;
1603         }
1604
1605         /* Open element snapshots (sequence one snapshot) */
1606         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_snapshots);
1607         if (ret) {
1608                 goto end;
1609         }
1610
1611 end:
1612         return ret;
1613 }
1614
1615 LTTNG_HIDDEN
1616 int mi_lttng_snapshot_list_output(struct mi_writer *writer,
1617                 struct lttng_snapshot_output *output)
1618 {
1619         int ret;
1620
1621         /* Open element snapshot output */
1622         ret = mi_lttng_writer_open_element(writer,
1623                         mi_lttng_element_command_snapshot);
1624         if (ret) {
1625                 goto end;
1626         }
1627
1628         /* ID of the snapshot output */
1629         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1630                         mi_lttng_element_id, output->id);
1631         if (ret) {
1632                 goto end;
1633         }
1634
1635         /* Name of the output */
1636         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1637                         output->name);
1638         if (ret) {
1639                 goto end;
1640         }
1641
1642         /* Destination of the output (ctrl_url)*/
1643         ret = mi_lttng_writer_write_element_string(writer,
1644                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1645         if (ret) {
1646                 goto end;
1647         }
1648
1649         /* Destination of the output (data_url) */
1650         ret = mi_lttng_writer_write_element_string(writer,
1651                         mi_lttng_element_snapshot_data_url, output->data_url);
1652         if (ret) {
1653                 goto end;
1654         }
1655
1656         /* total size of all stream combined */
1657         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1658                         mi_lttng_element_snapshot_max_size, output->max_size);
1659         if (ret) {
1660                 goto end;
1661         }
1662
1663         /* Close snapshot output element */
1664         ret = mi_lttng_writer_close_element(writer);
1665
1666 end:
1667         return ret;
1668 }
1669
1670 LTTNG_HIDDEN
1671 int mi_lttng_snapshot_del_output(struct mi_writer *writer, int id,
1672                 const char *name, const char *current_session_name)
1673 {
1674         int ret;
1675
1676         /* Open element del_snapshot */
1677         ret = mi_lttng_writer_open_element(writer,
1678                         mi_lttng_element_command_snapshot);
1679         if (ret) {
1680                 goto end;
1681         }
1682
1683
1684         if (id != UINT32_MAX) {
1685                 /* "Snapshot output "id" successfully deleted
1686                  * for "current_session_name"
1687                  * ID of the snapshot output
1688                  */
1689                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1690                                 mi_lttng_element_id, id);
1691                 if (ret) {
1692                         goto end;
1693                 }
1694         } else {
1695                 /* "Snapshot output "name" successfully deleted
1696                  * for session "current_session_name"
1697                  * Name of the output
1698                  */
1699                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1700                                 name);
1701                 if (ret) {
1702                         goto end;
1703                 }
1704         }
1705
1706         /* Snapshot was deleted for session "current_session_name"*/
1707         ret = mi_lttng_writer_write_element_string(writer,
1708                         mi_lttng_element_snapshot_session_name,
1709                         current_session_name);
1710         if (ret) {
1711                 goto end;
1712         }
1713
1714         /* Close snapshot element */
1715         ret = mi_lttng_writer_close_element(writer);
1716
1717 end:
1718         return ret;
1719 }
1720
1721 LTTNG_HIDDEN
1722 int mi_lttng_snapshot_add_output(struct mi_writer *writer,
1723                 const char *current_session_name, const char *n_ptr,
1724                 struct lttng_snapshot_output *output)
1725 {
1726         int ret;
1727
1728         /* Open element snapshot */
1729         ret = mi_lttng_writer_open_element(writer,
1730                         mi_lttng_element_command_snapshot);
1731         if (ret) {
1732                 goto end;
1733         }
1734
1735         /* Snapshot output id */
1736         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1737                         mi_lttng_element_id, output->id);
1738         if (ret) {
1739                 goto end;
1740         }
1741
1742         /* Snapshot output names */
1743         ret = mi_lttng_writer_write_element_string(writer,
1744                         config_element_name, n_ptr);
1745         if (ret) {
1746                 goto end;
1747         }
1748
1749         /* Destination of the output (ctrl_url)*/
1750         ret = mi_lttng_writer_write_element_string(writer,
1751                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1752         if (ret) {
1753                 goto end;
1754         }
1755
1756         /* Snapshot added for session "current_session_name"*/
1757         ret = mi_lttng_writer_write_element_string(writer,
1758                         mi_lttng_element_snapshot_session_name, current_session_name);
1759         if (ret) {
1760                 goto end;
1761         }
1762
1763         /* total size of all stream combined */
1764         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1765                         mi_lttng_element_snapshot_max_size, output->max_size);
1766         if (ret) {
1767                 goto end;
1768         }
1769
1770         /* Close snapshot element */
1771         ret = mi_lttng_writer_close_element(writer);
1772
1773 end:
1774         return ret;
1775 }
1776
1777 LTTNG_HIDDEN
1778 int mi_lttng_snapshot_record(struct mi_writer *writer,
1779                 const char *current_session_name, const char *url,
1780                 const char *cmdline_ctrl_url, const char *cmdline_data_url)
1781 {
1782         int ret;
1783
1784         /* Open element snapshot */
1785         ret = mi_lttng_writer_open_element(writer,
1786                         mi_lttng_element_command_snapshot);
1787         if (ret) {
1788                 goto end;
1789         }
1790
1791         /*
1792          * If a valid an URL was given, serialize it,
1793          * else take the command line data and ctrl urls*/
1794         if (url) {
1795                 /* Destination of the output (ctrl_url)*/
1796                 ret = mi_lttng_writer_write_element_string(writer,
1797                                 mi_lttng_element_snapshot_ctrl_url, url);
1798                 if (ret) {
1799                         goto end;
1800                 }
1801         } else if (cmdline_ctrl_url) {
1802                 /* Destination of the output (ctrl_url)*/
1803                 ret = mi_lttng_writer_write_element_string(writer,
1804                                 mi_lttng_element_snapshot_ctrl_url, cmdline_ctrl_url);
1805                 if (ret) {
1806                         goto end;
1807                 }
1808
1809                 /* Destination of the output (data_url) */
1810                 ret = mi_lttng_writer_write_element_string(writer,
1811                                 mi_lttng_element_snapshot_data_url, cmdline_data_url);
1812                 if (ret) {
1813                         goto end;
1814                 }
1815         }
1816
1817         /* Close record_snapshot element */
1818         ret = mi_lttng_writer_close_element(writer);
1819
1820 end:
1821         return ret;
1822 }