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