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_calibrate = "calibrate";
  51 const char * const mi_lttng_element_command_create = "create";
  52 const char * const mi_lttng_element_command_destroy = "destroy";
  53 const char * const mi_lttng_element_command_disable_channel = "disable-channel";
  54 const char * const mi_lttng_element_command_disable_event = "disable-event";
  55 const char * const mi_lttng_element_command_enable_channels = "enable-channel";
  56 const char * const mi_lttng_element_command_enable_event = "enable-event";
  57 const char * const mi_lttng_element_command_list = "list";
  58 const char * const mi_lttng_element_command_load = "load";
  59 LTTNG_HIDDEN const char * const mi_lttng_element_command_metadata = "metadata";
  60 LTTNG_HIDDEN const char * const mi_lttng_element_command_metadata_action = "metadata_action";
  61 const char * const mi_lttng_element_command_name = "name";
  62 const char * const mi_lttng_element_command_output = "output";
  63 const char * const mi_lttng_element_command_save = "save";
  64 const char * const mi_lttng_element_command_set_session = "set-session";
  65 const char * const mi_lttng_element_command_snapshot = "snapshot";
  66 const char * const mi_lttng_element_command_snapshot_add = "add_snapshot";
  67 const char * const mi_lttng_element_command_snapshot_del = "del_snapshot";
  68 const char * const mi_lttng_element_command_snapshot_list = "list_snapshot";
  69 const char * const mi_lttng_element_command_snapshot_record = "record_snapshot";
  70 const char * const mi_lttng_element_command_start = "start";
  71 const char * const mi_lttng_element_command_stop = "stop";
  72 const char * const mi_lttng_element_command_success = "success";
  73 const char * const mi_lttng_element_command_track = "track";
  74 const char * const mi_lttng_element_command_untrack = "untrack";
  75 const char * const mi_lttng_element_command_version = "version";
  76
  77 /* Strings related to version command */
  78 const char * const mi_lttng_element_version = "version";
  79 const char * const mi_lttng_element_version_commit = "commit";
  80 const char * const mi_lttng_element_version_description = "description";
  81 const char * const mi_lttng_element_version_license = "license";
  82 const char * const mi_lttng_element_version_major = "major";
  83 const char * const mi_lttng_element_version_minor = "minor";
  84 const char * const mi_lttng_element_version_patch_level = "patchLevel";
  85 const char * const mi_lttng_element_version_str = "string";
  86 const char * const mi_lttng_element_version_web = "url";
  87
  88 /* String related to a lttng_event_field */
  89 const char * const mi_lttng_element_event_field = "event_field";
  90 const char * const mi_lttng_element_event_fields = "event_fields";
  91
  92 /* String related to lttng_event_perf_counter_ctx */
  93 const char * const mi_lttng_element_perf_counter_context = "perf";
  94
  95 /* Strings related to pid */
  96 const char * const mi_lttng_element_pid_id = "id";
  97
  98 /* Strings related to save command */
  99 const char * const mi_lttng_element_save = "save";
 100
 101 /* Strings related to load command */
 102 const char * const mi_lttng_element_load = "load";
 103
 104 /* General elements of mi_lttng */
 105 const char * const mi_lttng_element_empty = "";
 106 const char * const mi_lttng_element_id = "id";
 107 const char * const mi_lttng_element_nowrite = "nowrite";
 108 const char * const mi_lttng_element_success = "success";
 109 const char * const mi_lttng_element_type_enum = "ENUM";
 110 const char * const mi_lttng_element_type_float = "FLOAT";
 111 const char * const mi_lttng_element_type_integer = "INTEGER";
 112 const char * const mi_lttng_element_type_other = "OTHER";
 113 const char * const mi_lttng_element_type_string = "STRING";
 114
 115 /* String related to loglevel */
 116 const char * const mi_lttng_loglevel_str_alert = "TRACE_ALERT";
 117 const char * const mi_lttng_loglevel_str_crit = "TRACE_CRIT";
 118 const char * const mi_lttng_loglevel_str_debug = "TRACE_DEBUG";
 119 const char * const mi_lttng_loglevel_str_debug_function = "TRACE_DEBUG_FUNCTION";
 120 const char * const mi_lttng_loglevel_str_debug_line = "TRACE_DEBUG_LINE";
 121 const char * const mi_lttng_loglevel_str_debug_module = "TRACE_DEBUG_MODULE";
 122 const char * const mi_lttng_loglevel_str_debug_process = "TRACE_DEBUG_PROCESS";
 123 const char * const mi_lttng_loglevel_str_debug_program = "TRACE_DEBUG_PROGRAM";
 124 const char * const mi_lttng_loglevel_str_debug_system = "TRACE_DEBUG_SYSTEM";
 125 const char * const mi_lttng_loglevel_str_debug_unit = "TRACE_DEBUG_UNIT";
 126 const char * const mi_lttng_loglevel_str_emerg = "TRACE_EMERG";
 127 const char * const mi_lttng_loglevel_str_err = "TRACE_ERR";
 128 const char * const mi_lttng_loglevel_str_info = "TRACE_INFO";
 129 const char * const mi_lttng_loglevel_str_notice = "TRACE_NOTICE";
 130 const char * const mi_lttng_loglevel_str_unknown = "UNKNOWN";
 131 const char * const mi_lttng_loglevel_str_warning = "TRACE_WARNING";
 132
 133 /* String related to loglevel JUL */
 134 const char * const mi_lttng_loglevel_str_jul_all = "JUL_ALL";
 135 const char * const mi_lttng_loglevel_str_jul_config = "JUL_CONFIG";
 136 const char * const mi_lttng_loglevel_str_jul_fine = "JUL_FINE";
 137 const char * const mi_lttng_loglevel_str_jul_finer = "JUL_FINER";
 138 const char * const mi_lttng_loglevel_str_jul_finest = "JUL_FINEST";
 139 const char * const mi_lttng_loglevel_str_jul_info = "JUL_INFO";
 140 const char * const mi_lttng_loglevel_str_jul_off = "JUL_OFF";
 141 const char * const mi_lttng_loglevel_str_jul_severe = "JUL_SEVERE";
 142 const char * const mi_lttng_loglevel_str_jul_warning = "JUL_WARNING";
 143
 144 /* String related to loglevel LOG4J */
 145 const char * const mi_lttng_loglevel_str_log4j_off = "LOG4J_OFF";
 146 const char * const mi_lttng_loglevel_str_log4j_fatal = "LOG4J_FATAL";
 147 const char * const mi_lttng_loglevel_str_log4j_error = "LOG4J_ERROR";
 148 const char * const mi_lttng_loglevel_str_log4j_warn = "LOG4J_WARN";
 149 const char * const mi_lttng_loglevel_str_log4j_info = "LOG4J_INFO";
 150 const char * const mi_lttng_loglevel_str_log4j_debug = "LOG4J_DEBUG";
 151 const char * const mi_lttng_loglevel_str_log4j_trace = "LOG4J_TRACE";
 152 const char * const mi_lttng_loglevel_str_log4j_all = "LOG4J_ALL";
 153
 154 /* String related to loglevel Python */
 155 const char * const mi_lttng_loglevel_str_python_critical = "PYTHON_CRITICAL";
 156 const char * const mi_lttng_loglevel_str_python_error = "PYTHON_ERROR";
 157 const char * const mi_lttng_loglevel_str_python_warning = "PYTHON_WARNING";
 158 const char * const mi_lttng_loglevel_str_python_info = "PYTHON_INFO";
 159 const char * const mi_lttng_loglevel_str_python_debug = "PYTHON_DEBUG";
 160 const char * const mi_lttng_loglevel_str_python_notset = "PYTHON_NOTSET";
 161
 162 /* String related to loglevel type */
 163 const char * const mi_lttng_loglevel_type_all = "ALL";
 164 const char * const mi_lttng_loglevel_type_range = "RANGE";
 165 const char * const mi_lttng_loglevel_type_single = "SINGLE";
 166 const char * const mi_lttng_loglevel_type_unknown = "UNKNOWN";
 167
 168 /* String related to lttng_calibrate */
 169 const char * const mi_lttng_element_calibrate = "calibrate";
 170 const char * const mi_lttng_element_calibrate_function = "FUNCTION";
 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
 184 /* This is a merge of jul loglevel and regular loglevel
 185  * Those should never overlap by definition
 186  * (see struct lttng_event loglevel)
 187  */
 188 LTTNG_HIDDEN
 189 const char *mi_lttng_loglevel_string(int value, enum lttng_domain_type domain)
 190 {
 191         switch (domain) {
 192         case LTTNG_DOMAIN_KERNEL:
 193         case LTTNG_DOMAIN_UST:
 194                 switch (value) {
 195                 case -1:
 196                         return mi_lttng_element_empty;
 197                 case LTTNG_LOGLEVEL_EMERG:
 198                         return mi_lttng_loglevel_str_emerg;
 199                 case LTTNG_LOGLEVEL_ALERT:
 200                         return mi_lttng_loglevel_str_alert;
 201                 case LTTNG_LOGLEVEL_CRIT:
 202                         return mi_lttng_loglevel_str_crit;
 203                 case LTTNG_LOGLEVEL_ERR:
 204                         return mi_lttng_loglevel_str_err;
 205                 case LTTNG_LOGLEVEL_WARNING:
 206                         return mi_lttng_loglevel_str_warning;
 207                 case LTTNG_LOGLEVEL_NOTICE:
 208                         return mi_lttng_loglevel_str_notice;
 209                 case LTTNG_LOGLEVEL_INFO:
 210                         return mi_lttng_loglevel_str_info;
 211                 case LTTNG_LOGLEVEL_DEBUG_SYSTEM:
 212                         return mi_lttng_loglevel_str_debug_system;
 213                 case LTTNG_LOGLEVEL_DEBUG_PROGRAM:
 214                         return mi_lttng_loglevel_str_debug_program;
 215                 case LTTNG_LOGLEVEL_DEBUG_PROCESS:
 216                         return mi_lttng_loglevel_str_debug_process;
 217                 case LTTNG_LOGLEVEL_DEBUG_MODULE:
 218                         return mi_lttng_loglevel_str_debug_module;
 219                 case LTTNG_LOGLEVEL_DEBUG_UNIT:
 220                         return mi_lttng_loglevel_str_debug_unit;
 221                 case LTTNG_LOGLEVEL_DEBUG_FUNCTION:
 222                         return mi_lttng_loglevel_str_debug_function;
 223                 case LTTNG_LOGLEVEL_DEBUG_LINE:
 224                         return mi_lttng_loglevel_str_debug_line;
 225                 case LTTNG_LOGLEVEL_DEBUG:
 226                         return mi_lttng_loglevel_str_debug;
 227                 default:
 228                         return mi_lttng_loglevel_str_unknown;
 229                 }
 230                 break;
 231         case LTTNG_DOMAIN_LOG4J:
 232                 switch (value) {
 233                 case -1:
 234                         return mi_lttng_element_empty;
 235                 case LTTNG_LOGLEVEL_LOG4J_OFF:
 236                         return mi_lttng_loglevel_str_log4j_off;
 237                 case LTTNG_LOGLEVEL_LOG4J_FATAL:
 238                         return mi_lttng_loglevel_str_log4j_fatal;
 239                 case LTTNG_LOGLEVEL_LOG4J_ERROR:
 240                         return mi_lttng_loglevel_str_log4j_error;
 241                 case LTTNG_LOGLEVEL_LOG4J_WARN:
 242                         return mi_lttng_loglevel_str_log4j_warn;
 243                 case LTTNG_LOGLEVEL_LOG4J_INFO:
 244                         return mi_lttng_loglevel_str_log4j_info;
 245                 case LTTNG_LOGLEVEL_LOG4J_DEBUG:
 246                         return mi_lttng_loglevel_str_log4j_debug;
 247                 case LTTNG_LOGLEVEL_LOG4J_TRACE:
 248                         return mi_lttng_loglevel_str_log4j_trace;
 249                 case LTTNG_LOGLEVEL_LOG4J_ALL:
 250                         return mi_lttng_loglevel_str_log4j_all;
 251                 default:
 252                         return mi_lttng_loglevel_str_unknown;
 253                 }
 254                 break;
 255         case LTTNG_DOMAIN_JUL:
 256                 switch (value) {
 257                 case -1:
 258                         return mi_lttng_element_empty;
 259                 case LTTNG_LOGLEVEL_JUL_OFF:
 260                         return mi_lttng_loglevel_str_jul_off;
 261                 case LTTNG_LOGLEVEL_JUL_SEVERE:
 262                         return mi_lttng_loglevel_str_jul_severe;
 263                 case LTTNG_LOGLEVEL_JUL_WARNING:
 264                         return mi_lttng_loglevel_str_jul_warning;
 265                 case LTTNG_LOGLEVEL_JUL_INFO:
 266                         return mi_lttng_loglevel_str_jul_info;
 267                 case LTTNG_LOGLEVEL_JUL_CONFIG:
 268                         return mi_lttng_loglevel_str_jul_config;
 269                 case LTTNG_LOGLEVEL_JUL_FINE:
 270                         return mi_lttng_loglevel_str_jul_fine;
 271                 case LTTNG_LOGLEVEL_JUL_FINER:
 272                         return mi_lttng_loglevel_str_jul_finer;
 273                 case LTTNG_LOGLEVEL_JUL_FINEST:
 274                         return mi_lttng_loglevel_str_jul_finest;
 275                 case LTTNG_LOGLEVEL_JUL_ALL:
 276                         return mi_lttng_loglevel_str_jul_all;
 277                 default:
 278                         return mi_lttng_loglevel_str_unknown;
 279                 }
 280                 break;
 281         case LTTNG_DOMAIN_PYTHON:
 282                 switch (value) {
 283                 case LTTNG_LOGLEVEL_PYTHON_CRITICAL:
 284                         return mi_lttng_loglevel_str_python_critical;
 285                 case LTTNG_LOGLEVEL_PYTHON_ERROR:
 286                         return mi_lttng_loglevel_str_python_error;
 287                 case LTTNG_LOGLEVEL_PYTHON_WARNING:
 288                         return mi_lttng_loglevel_str_python_warning;
 289                 case LTTNG_LOGLEVEL_PYTHON_INFO:
 290                         return mi_lttng_loglevel_str_python_info;
 291                 case LTTNG_LOGLEVEL_PYTHON_DEBUG:
 292                         return mi_lttng_loglevel_str_python_debug;
 293                 case LTTNG_LOGLEVEL_PYTHON_NOTSET:
 294                         return mi_lttng_loglevel_str_python_notset;
 295                 default:
 296                         return mi_lttng_loglevel_str_unknown;
 297                 }
 298                 break;
 299         }
 300
 301         /* Reaching this means the domain is unknown. */
 302         return mi_lttng_loglevel_str_unknown;
 303 }
 304
 305 LTTNG_HIDDEN
 306 const char *mi_lttng_logleveltype_string(enum lttng_loglevel_type value)
 307 {
 308         switch (value) {
 309         case LTTNG_EVENT_LOGLEVEL_ALL:
 310                 return mi_lttng_loglevel_type_all;
 311         case LTTNG_EVENT_LOGLEVEL_RANGE:
 312                 return mi_lttng_loglevel_type_range;
 313         case LTTNG_EVENT_LOGLEVEL_SINGLE:
 314                 return mi_lttng_loglevel_type_single;
 315         default:
 316                 return mi_lttng_loglevel_type_unknown;
 317         }
 318 }
 319
 320 LTTNG_HIDDEN
 321 const char *mi_lttng_eventtype_string(enum lttng_event_type value)
 322 {
 323         switch (value) {
 324         case LTTNG_EVENT_ALL:
 325                 return config_event_type_all;
 326         case LTTNG_EVENT_TRACEPOINT:
 327                 return config_event_type_tracepoint;
 328         case LTTNG_EVENT_PROBE:
 329                 return config_event_type_probe;
 330         case LTTNG_EVENT_FUNCTION:
 331                 return config_event_type_function;
 332         case LTTNG_EVENT_FUNCTION_ENTRY:
 333                 return config_event_type_function_entry;
 334         case LTTNG_EVENT_SYSCALL:
 335                 return config_event_type_syscall;
 336         case LTTNG_EVENT_NOOP:
 337                 return config_event_type_noop;
 338         default:
 339                 return mi_lttng_element_empty;
 340         }
 341 }
 342
 343 static
 344 const char *mi_lttng_event_contexttype_string(enum lttng_event_context_type val)
 345 {
 346         switch (val) {
 347         case LTTNG_EVENT_CONTEXT_PID:
 348                 return config_event_context_pid;
 349         case LTTNG_EVENT_CONTEXT_PROCNAME:
 350                 return config_event_context_procname;
 351         case LTTNG_EVENT_CONTEXT_PRIO:
 352                 return config_event_context_prio;
 353         case LTTNG_EVENT_CONTEXT_NICE:
 354                 return config_event_context_nice;
 355         case LTTNG_EVENT_CONTEXT_VPID:
 356                 return config_event_context_vpid;
 357         case LTTNG_EVENT_CONTEXT_TID:
 358                 return config_event_context_tid;
 359         case LTTNG_EVENT_CONTEXT_VTID:
 360                 return config_event_context_vtid;
 361         case LTTNG_EVENT_CONTEXT_PPID:
 362                 return config_event_context_ppid;
 363         case LTTNG_EVENT_CONTEXT_VPPID:
 364                 return config_event_context_vppid;
 365         case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
 366                 return config_event_context_pthread_id;
 367         case LTTNG_EVENT_CONTEXT_HOSTNAME:
 368                 return config_event_context_hostname;
 369         case LTTNG_EVENT_CONTEXT_IP:
 370                 return config_event_context_ip;
 371         default:
 372                 return NULL;
 373         }
 374 }
 375
 376 LTTNG_HIDDEN
 377 const char *mi_lttng_eventfieldtype_string(enum lttng_event_field_type val)
 378 {
 379         switch (val) {
 380         case(LTTNG_EVENT_FIELD_INTEGER):
 381                 return mi_lttng_element_type_integer;
 382         case(LTTNG_EVENT_FIELD_ENUM):
 383                 return mi_lttng_element_type_enum;
 384         case(LTTNG_EVENT_FIELD_FLOAT):
 385                 return mi_lttng_element_type_float;
 386         case(LTTNG_EVENT_FIELD_STRING):
 387                 return mi_lttng_element_type_string;
 388         default:
 389                 return mi_lttng_element_type_other;
 390         }
 391 }
 392
 393 LTTNG_HIDDEN
 394 const char *mi_lttng_domaintype_string(enum lttng_domain_type value)
 395 {
 396         /* Note: This is a *duplicate* of get_domain_str from bin/lttng/utils.c */
 397         switch (value) {
 398         case LTTNG_DOMAIN_KERNEL:
 399                 return config_domain_type_kernel;
 400         case LTTNG_DOMAIN_UST:
 401                 return config_domain_type_ust;
 402         case LTTNG_DOMAIN_JUL:
 403                 return config_domain_type_jul;
 404         case LTTNG_DOMAIN_LOG4J:
 405                 return config_domain_type_log4j;
 406         case LTTNG_DOMAIN_PYTHON:
 407                 return config_domain_type_python;
 408         default:
 409                 /* Should not have an unknown domain */
 410                 assert(0);
 411                 return NULL;
 412         }
 413 }
 414
 415 LTTNG_HIDDEN
 416 const char *mi_lttng_buffertype_string(enum lttng_buffer_type value)
 417 {
 418         switch (value) {
 419         case LTTNG_BUFFER_PER_PID:
 420                 return config_buffer_type_per_pid;
 421         case LTTNG_BUFFER_PER_UID:
 422                 return config_buffer_type_per_uid;
 423         case LTTNG_BUFFER_GLOBAL:
 424                 return config_buffer_type_global;
 425         default:
 426                 /* Should not have an unknow buffer type */
 427                 assert(0);
 428                 return NULL;
 429         }
 430 }
 431
 432 LTTNG_HIDDEN
 433 const char *mi_lttng_calibratetype_string(enum lttng_calibrate_type val)
 434 {
 435         const char *ret;
 436
 437         switch (val) {
 438         case LTTNG_CALIBRATE_FUNCTION:
 439                 ret = mi_lttng_element_calibrate_function;
 440                 break;
 441         default:
 442                 ret = mi_lttng_element_empty;
 443                 break;
 444         }
 445         return ret;
 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;
 875
 876         assert(attr);
 877
 878         ret = lttng_channel_get_discarded_event_count(chan, &discarded_events);
 879         if (ret) {
 880                 goto end;
 881         }
 882
 883         ret = lttng_channel_get_lost_packet_count(chan, &lost_packets);
 884         if (ret) {
 885                 goto end;
 886         }
 887
 888         /* Opening Attributes */
 889         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
 890         if (ret) {
 891                 goto end;
 892         }
 893
 894         /* Overwrite */
 895         ret = mi_lttng_writer_write_element_string(writer,
 896                 config_element_overwrite_mode,
 897                 attr->overwrite ? config_overwrite_mode_overwrite :
 898                         config_overwrite_mode_discard);
 899         if (ret) {
 900                 goto end;
 901         }
 902
 903         /* Sub buffer size in byte */
 904         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 905                 config_element_subbuf_size, attr->subbuf_size);
 906         if (ret) {
 907                 goto end;
 908         }
 909
 910         /* Number of subbuffer (power of two) */
 911         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 912                 config_element_num_subbuf,
 913                 attr->num_subbuf);
 914         if (ret) {
 915                 goto end;
 916         }
 917
 918         /* Switch timer interval in usec */
 919         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 920                 config_element_switch_timer_interval,
 921                 attr->switch_timer_interval);
 922         if (ret) {
 923                 goto end;
 924         }
 925
 926         /* Read timer interval in usec */
 927         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 928                 config_element_read_timer_interval,
 929                 attr->read_timer_interval);
 930         if (ret) {
 931                 goto end;
 932         }
 933
 934         /* Event output */
 935         ret = mi_lttng_writer_write_element_string(writer,
 936                 config_element_output_type,
 937                 attr->output == LTTNG_EVENT_SPLICE ?
 938                 config_output_type_splice : config_output_type_mmap);
 939         if (ret) {
 940                 goto end;
 941         }
 942
 943         /* Tracefile size in bytes */
 944         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 945                 config_element_tracefile_size, attr->tracefile_size);
 946         if (ret) {
 947                 goto end;
 948         }
 949
 950         /* Count of tracefiles */
 951         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 952                 config_element_tracefile_count,
 953                 attr->tracefile_count);
 954         if (ret) {
 955                 goto end;
 956         }
 957
 958         /* Live timer interval in usec*/
 959         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 960                 config_element_live_timer_interval,
 961                 attr->live_timer_interval);
 962         if (ret) {
 963                 goto end;
 964         }
 965
 966         /* Discarded events */
 967         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 968                 config_element_discarded_events,
 969                 discarded_events);
 970         if (ret) {
 971                 goto end;
 972         }
 973
 974         /* Lost packets */
 975         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 976                 config_element_lost_packets,
 977                 lost_packets);
 978         if (ret) {
 979                 goto end;
 980         }
 981
 982         /* Closing attributes */
 983         ret = mi_lttng_writer_close_element(writer);
 984         if (ret) {
 985                 goto end;
 986         }
 987 end:
 988         return ret;
 989
 990 }
 991
 992 LTTNG_HIDDEN
 993 int mi_lttng_event_common_attributes(struct mi_writer *writer,
 994                 struct lttng_event *event)
 995 {
 996         int ret;
 997         const char *filter_expression;
 998
 999         /* Open event element */
1000         ret = mi_lttng_writer_open_element(writer, config_element_event);
1001         if (ret) {
1002                 goto end;
1003         }
1004
1005         /* Event name */
1006         ret = mi_lttng_writer_write_element_string(writer,
1007                         config_element_name, event->name);
1008         if (ret) {
1009                 goto end;
1010         }
1011
1012         /* Event type */
1013         ret = mi_lttng_writer_write_element_string(writer,
1014                         config_element_type, mi_lttng_eventtype_string(event->type));
1015         if (ret) {
1016                 goto end;
1017         }
1018
1019         /* Is event enabled */
1020         ret = mi_lttng_writer_write_element_bool(writer,
1021                         config_element_enabled, event->enabled);
1022         if (ret) {
1023                 goto end;
1024         }
1025
1026         /* Event filter expression */
1027         ret = lttng_event_get_filter_expression(event, &filter_expression);
1028         if (ret) {
1029                 goto end;
1030         }
1031
1032         if (filter_expression) {
1033                 ret = mi_lttng_writer_write_element_string(writer,
1034                                 config_element_filter_expression,
1035                                 filter_expression);
1036                 if (ret) {
1037                         goto end;
1038                 }
1039         }
1040
1041 end:
1042         return ret;
1043 }
1044
1045 static int write_event_exclusions(struct mi_writer *writer,
1046                 struct lttng_event *event)
1047 {
1048         int i;
1049         int ret;
1050         int exclusion_count;
1051
1052         /* Open event exclusions */
1053         ret = mi_lttng_writer_open_element(writer, config_element_exclusions);
1054         if (ret) {
1055                 goto end;
1056         }
1057
1058         exclusion_count = lttng_event_get_exclusion_name_count(event);
1059         if (exclusion_count < 0) {
1060                 ret = exclusion_count;
1061                 goto end;
1062         }
1063
1064         for (i = 0; i < exclusion_count; i++) {
1065                 const char *name;
1066
1067                 ret = lttng_event_get_exclusion_name(event, i, &name);
1068                 if (ret) {
1069                         /* Close exclusions */
1070                         mi_lttng_writer_close_element(writer);
1071                         goto end;
1072                 }
1073
1074                 ret = mi_lttng_writer_write_element_string(writer,
1075                                 config_element_exclusion, name);
1076                 if (ret) {
1077                         /* Close exclusions */
1078                         mi_lttng_writer_close_element(writer);
1079                         goto end;
1080                 }
1081         }
1082
1083         /* Close exclusions */
1084         ret = mi_lttng_writer_close_element(writer);
1085
1086 end:
1087         return ret;
1088 }
1089
1090 LTTNG_HIDDEN
1091 int mi_lttng_event_tracepoint_loglevel(struct mi_writer *writer,
1092                 struct lttng_event *event, enum lttng_domain_type domain)
1093 {
1094         int ret;
1095
1096         /* Event loglevel */
1097         ret = mi_lttng_writer_write_element_string(writer,
1098                         config_element_loglevel,
1099                         mi_lttng_loglevel_string(event->loglevel, domain));
1100         if (ret) {
1101                 goto end;
1102         }
1103
1104         /* Log level type */
1105         ret = mi_lttng_writer_write_element_string(writer,
1106                         config_element_loglevel_type,
1107                         mi_lttng_logleveltype_string(event->loglevel_type));
1108         if (ret) {
1109                 goto end;
1110         }
1111
1112         /* Event exclusions */
1113         ret = write_event_exclusions(writer, event);
1114
1115 end:
1116         return ret;
1117 }
1118
1119 LTTNG_HIDDEN
1120 int mi_lttng_event_tracepoint_no_loglevel(struct mi_writer *writer,
1121                 struct lttng_event *event)
1122 {
1123         /* event exclusion filter */
1124         return write_event_exclusions(writer, event);
1125 }
1126
1127 LTTNG_HIDDEN
1128 int mi_lttng_event_function_probe(struct mi_writer *writer,
1129                 struct lttng_event *event)
1130 {
1131         int ret;
1132
1133         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1134         if (ret) {
1135                 goto end;
1136         }
1137
1138         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1139         if (ret) {
1140                 goto end;
1141         }
1142
1143         if (event->attr.probe.addr != 0) {
1144                 /* event probe address */
1145                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1146                                 config_element_address, event->attr.probe.addr);
1147                 if (ret) {
1148                         goto end;
1149                 }
1150         } else {
1151                 /* event probe offset */
1152                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1153                                 config_element_offset, event->attr.probe.offset);
1154                 if (ret) {
1155                         goto end;
1156                 }
1157
1158                 /* event probe symbol_name */
1159                 ret = mi_lttng_writer_write_element_string(writer,
1160                                 config_element_symbol_name, event->attr.probe.symbol_name);
1161                 if (ret) {
1162                         goto end;
1163                 }
1164         }
1165
1166         /* Close probe_attributes and attributes */
1167         ret = mi_lttng_close_multi_element(writer, 2);
1168 end:
1169         return ret;
1170 }
1171
1172 LTTNG_HIDDEN
1173 int mi_lttng_event_function_entry(struct mi_writer *writer,
1174                 struct lttng_event *event)
1175 {
1176         int ret;
1177
1178         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1179         if (ret) {
1180                 goto end;
1181         }
1182
1183         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1184         if (ret) {
1185                 goto end;
1186         }
1187
1188         /* event probe symbol_name */
1189         ret = mi_lttng_writer_write_element_string(writer,
1190                         config_element_symbol_name, event->attr.ftrace.symbol_name);
1191         if (ret) {
1192                 goto end;
1193         }
1194
1195         /* Close function_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_events_open(struct mi_writer *writer)
1203 {
1204         return mi_lttng_writer_open_element(writer, config_element_events);
1205 }
1206
1207 LTTNG_HIDDEN
1208 int mi_lttng_event(struct mi_writer *writer,
1209                 struct lttng_event *event, int is_open, enum lttng_domain_type domain)
1210 {
1211         int ret;
1212
1213         ret = mi_lttng_event_common_attributes(writer, event);
1214         if (ret) {
1215                 goto end;
1216         }
1217
1218         switch (event->type) {
1219         case LTTNG_EVENT_TRACEPOINT:
1220         {
1221                 if (event->loglevel != -1) {
1222                         ret = mi_lttng_event_tracepoint_loglevel(writer, event, domain);
1223                 } else {
1224                         ret = mi_lttng_event_tracepoint_no_loglevel(writer, event);
1225                 }
1226                 break;
1227         }
1228         case LTTNG_EVENT_FUNCTION:
1229                 /* Fallthrough */
1230         case LTTNG_EVENT_PROBE:
1231                 ret = mi_lttng_event_function_probe(writer, event);
1232                 break;
1233         case LTTNG_EVENT_FUNCTION_ENTRY:
1234                 ret = mi_lttng_event_function_entry(writer, event);
1235                 break;
1236         case LTTNG_EVENT_ALL:
1237                 /* Fallthrough */
1238         default:
1239                 break;
1240         }
1241
1242         if (!is_open) {
1243                 ret = mi_lttng_writer_close_element(writer);
1244         }
1245
1246 end:
1247         return ret;
1248 }
1249
1250 LTTNG_HIDDEN
1251 int mi_lttng_trackers_open(struct mi_writer *writer)
1252 {
1253         return mi_lttng_writer_open_element(writer, config_element_trackers);
1254 }
1255
1256 LTTNG_HIDDEN
1257 int mi_lttng_pid_tracker_open(struct mi_writer *writer)
1258 {
1259         int ret;
1260
1261         /* Open element pid_tracker */
1262         ret = mi_lttng_writer_open_element(writer, config_element_pid_tracker);
1263         if (ret) {
1264                 goto end;
1265         }
1266
1267         /* Open targets element */
1268         ret = mi_lttng_targets_open(writer);
1269 end:
1270         return ret;
1271 }
1272
1273 LTTNG_HIDDEN
1274 int mi_lttng_pids_open(struct mi_writer *writer)
1275 {
1276         return mi_lttng_writer_open_element(writer, config_element_pids);
1277 }
1278
1279 /*
1280  * TODO: move the listing of pid for user agent to process semantic on
1281  * mi api bump. The use of process element break the mi api.
1282  */
1283 LTTNG_HIDDEN
1284 int mi_lttng_pid(struct mi_writer *writer, pid_t pid , const char *name,
1285                 int is_open)
1286 {
1287         int ret;
1288
1289         /* Open pid process */
1290         ret = mi_lttng_writer_open_element(writer, config_element_pid);
1291         if (ret) {
1292                 goto end;
1293         }
1294
1295         /* Writing pid number */
1296         ret = mi_lttng_writer_write_element_signed_int(writer,
1297                         mi_lttng_element_pid_id, (int)pid);
1298         if (ret) {
1299                 goto end;
1300         }
1301
1302         /* Writing name of the process */
1303         if (name) {
1304                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1305                                 name);
1306                 if (ret) {
1307                         goto end;
1308                 }
1309         }
1310
1311         if (!is_open) {
1312                 /* Closing Pid */
1313                 ret = mi_lttng_writer_close_element(writer);
1314         }
1315
1316 end:
1317         return ret;
1318 }
1319
1320 LTTNG_HIDDEN
1321 int mi_lttng_targets_open(struct mi_writer *writer)
1322 {
1323         return mi_lttng_writer_open_element(writer,
1324                         config_element_targets);
1325 }
1326
1327 LTTNG_HIDDEN
1328 int mi_lttng_pid_target(struct mi_writer *writer, pid_t pid, int is_open)
1329 {
1330         int ret;
1331
1332         ret = mi_lttng_writer_open_element(writer,
1333                         config_element_target_pid);
1334         if (ret) {
1335                 goto end;
1336         }
1337
1338         /* Writing pid number
1339          * Special case for element all on track untrack command
1340          * All pid is represented as wildcard *
1341          */
1342         if ((int) pid == -1) {
1343                 ret = mi_lttng_writer_write_element_string(writer,
1344                                 config_element_pid,
1345                                 mi_lttng_element_track_untrack_all_wildcard);
1346         } else {
1347                 ret = mi_lttng_writer_write_element_signed_int(writer,
1348                                 config_element_pid, (int) pid);
1349         }
1350         if (ret) {
1351                 goto end;
1352         }
1353
1354         if (!is_open) {
1355                 ret = mi_lttng_writer_close_element(writer);
1356                 if (ret) {
1357                         goto end;
1358                 }
1359         }
1360
1361 end:
1362         return ret;
1363 }
1364
1365 LTTNG_HIDDEN
1366 int mi_lttng_event_fields_open(struct mi_writer *writer)
1367 {
1368         return mi_lttng_writer_open_element(writer, mi_lttng_element_event_fields);
1369 }
1370
1371 LTTNG_HIDDEN
1372 int mi_lttng_event_field(struct mi_writer *writer,
1373                 struct lttng_event_field *field)
1374 {
1375         int ret;
1376
1377         if (!field->field_name[0]) {
1378                 ret = 0;
1379                 goto end;
1380         }
1381
1382         /* Open field */
1383         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_event_field);
1384         if (ret) {
1385                 goto end;
1386         }
1387
1388         if (!field->field_name[0]) {
1389                 goto close;
1390         }
1391
1392         /* Name */
1393         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1394                         field->field_name);
1395         if (ret) {
1396                 goto end;
1397         }
1398
1399         /* Type */
1400         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1401                         mi_lttng_eventfieldtype_string(field->type));
1402         if (ret) {
1403                 goto end;
1404         }
1405
1406         /* nowrite  */
1407         ret = mi_lttng_writer_write_element_signed_int(writer,
1408                         mi_lttng_element_nowrite, field->nowrite);
1409         if (ret) {
1410                 goto end;
1411         }
1412
1413 close:
1414         /* Close field element */
1415         ret = mi_lttng_writer_close_element(writer);
1416
1417 end:
1418         return ret;
1419 }
1420
1421 LTTNG_HIDDEN
1422 int mi_lttng_calibrate(struct mi_writer *writer,
1423                 struct lttng_calibrate *calibrate)
1424 {
1425         int ret;
1426
1427         /* Open calibrate element */
1428         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_calibrate);
1429         if (ret) {
1430                 goto end;
1431         }
1432
1433         /* Calibration type */
1434         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1435                         mi_lttng_calibratetype_string(calibrate->type));
1436         if (ret) {
1437                 goto end;
1438         }
1439
1440         /* Closing calibrate element */
1441         ret = mi_lttng_writer_close_element(writer);
1442 end:
1443         return ret;
1444 }
1445
1446 LTTNG_HIDDEN
1447 int mi_lttng_perf_counter_context(struct mi_writer *writer,
1448                 struct lttng_event_perf_counter_ctx  *perf_context)
1449 {
1450         int ret;
1451
1452         /* Open perf_counter_context */
1453         ret = mi_lttng_writer_open_element(writer,
1454                         mi_lttng_element_perf_counter_context);
1455         if (ret) {
1456                 goto end;
1457         }
1458
1459         /* Type */
1460         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1461                         config_element_type, perf_context->type);
1462         if (ret) {
1463                 goto end;
1464         }
1465
1466         /* Config */
1467         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1468                         config_element_config, perf_context->config);
1469         if (ret) {
1470                 goto end;
1471         }
1472
1473         /* Name of the perf counter */
1474         ret = mi_lttng_writer_write_element_string(writer,
1475                         config_element_name, perf_context->name);
1476         if (ret) {
1477                 goto end;
1478         }
1479
1480         /* Close perf_counter_context */
1481         ret = mi_lttng_writer_close_element(writer);
1482 end:
1483         return ret;
1484 }
1485
1486 static
1487 int mi_lttng_app_context(struct mi_writer *writer,
1488                 const char *provider_name, const char *ctx_name)
1489 {
1490         int ret;
1491
1492         /* Open app */
1493         ret = mi_lttng_writer_open_element(writer,
1494                         config_element_context_app);
1495         if (ret) {
1496                 goto end;
1497         }
1498
1499         /* provider_name */
1500         ret = mi_lttng_writer_write_element_string(writer,
1501                         config_element_context_app_provider_name,
1502                         provider_name);
1503         if (ret) {
1504                 goto end;
1505         }
1506
1507         /* ctx_name */
1508         ret = mi_lttng_writer_write_element_string(writer,
1509                         config_element_context_app_ctx_name, ctx_name);
1510         if (ret) {
1511                 goto end;
1512         }
1513
1514         /* Close app */
1515         ret = mi_lttng_writer_close_element(writer);
1516 end:
1517         return ret;
1518 }
1519
1520 LTTNG_HIDDEN
1521 int mi_lttng_context(struct mi_writer *writer,
1522                 struct lttng_event_context *context, int is_open)
1523 {
1524         int ret;
1525
1526         /* Open context */
1527         ret = mi_lttng_writer_open_element(writer , config_element_context);
1528         if (ret) {
1529                 goto end;
1530         }
1531
1532         /* Special case for PERF_*_COUNTER
1533          * print the lttng_event_perf_counter_ctx*/
1534         switch (context->ctx) {
1535         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
1536         case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
1537         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
1538         {
1539                 struct lttng_event_perf_counter_ctx *perf_context =
1540                                 &context->u.perf_counter;
1541                 ret =  mi_lttng_perf_counter_context(writer, perf_context);
1542                 if (ret) {
1543                         goto end;
1544                 }
1545                 break;
1546         }
1547         case LTTNG_EVENT_CONTEXT_APP_CONTEXT:
1548         {
1549                 ret = mi_lttng_app_context(writer,
1550                                 context->u.app_ctx.provider_name,
1551                                 context->u.app_ctx.ctx_name);
1552                 if (ret) {
1553                         goto end;
1554                 }
1555                 break;
1556         }
1557         default:
1558         {
1559                 const char *type_string = mi_lttng_event_contexttype_string(
1560                                 context->ctx);
1561                 if (!type_string) {
1562                         ret = -LTTNG_ERR_INVALID;
1563                         goto end;
1564                 }
1565
1566                 /* Print context type */
1567                 ret = mi_lttng_writer_write_element_string(writer,
1568                                 config_element_type, type_string);
1569                 break;
1570         }
1571         }
1572
1573         /* Close context */
1574         if (!is_open) {
1575                 ret = mi_lttng_writer_close_element(writer);
1576         }
1577
1578 end:
1579         return ret;
1580 }
1581
1582 LTTNG_HIDDEN
1583 int mi_lttng_snapshot_output_session_name(struct mi_writer *writer,
1584                 const char *session_name)
1585 {
1586         int ret;
1587
1588         /* Open session element */
1589         ret = mi_lttng_writer_open_element(writer, config_element_session);
1590         if (ret) {
1591                 goto end;
1592         }
1593
1594         /* Snapshot output list for current session name */
1595         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1596                         session_name);
1597         if (ret) {
1598                 goto end;
1599         }
1600
1601         /* Open element snapshots (sequence one snapshot) */
1602         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_snapshots);
1603         if (ret) {
1604                 goto end;
1605         }
1606
1607 end:
1608         return ret;
1609 }
1610
1611 LTTNG_HIDDEN
1612 int mi_lttng_snapshot_list_output(struct mi_writer *writer,
1613                 struct lttng_snapshot_output *output)
1614 {
1615         int ret;
1616
1617         /* Open element snapshot output */
1618         ret = mi_lttng_writer_open_element(writer,
1619                         mi_lttng_element_command_snapshot);
1620         if (ret) {
1621                 goto end;
1622         }
1623
1624         /* ID of the snapshot output */
1625         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1626                         mi_lttng_element_id, output->id);
1627         if (ret) {
1628                 goto end;
1629         }
1630
1631         /* Name of the output */
1632         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1633                         output->name);
1634         if (ret) {
1635                 goto end;
1636         }
1637
1638         /* Destination of the output (ctrl_url)*/
1639         ret = mi_lttng_writer_write_element_string(writer,
1640                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1641         if (ret) {
1642                 goto end;
1643         }
1644
1645         /* Destination of the output (data_url) */
1646         ret = mi_lttng_writer_write_element_string(writer,
1647                         mi_lttng_element_snapshot_data_url, output->data_url);
1648         if (ret) {
1649                 goto end;
1650         }
1651
1652         /* total size of all stream combined */
1653         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1654                         mi_lttng_element_snapshot_max_size, output->max_size);
1655         if (ret) {
1656                 goto end;
1657         }
1658
1659         /* Close snapshot output element */
1660         ret = mi_lttng_writer_close_element(writer);
1661
1662 end:
1663         return ret;
1664 }
1665
1666 LTTNG_HIDDEN
1667 int mi_lttng_snapshot_del_output(struct mi_writer *writer, int id,
1668                 const char *name, const char *current_session_name)
1669 {
1670         int ret;
1671
1672         /* Open element del_snapshot */
1673         ret = mi_lttng_writer_open_element(writer,
1674                         mi_lttng_element_command_snapshot);
1675         if (ret) {
1676                 goto end;
1677         }
1678
1679
1680         if (id != UINT32_MAX) {
1681                 /* "Snapshot output "id" successfully deleted
1682                  * for "current_session_name"
1683                  * ID of the snapshot output
1684                  */
1685                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1686                                 mi_lttng_element_id, id);
1687                 if (ret) {
1688                         goto end;
1689                 }
1690         } else {
1691                 /* "Snapshot output "name" successfully deleted
1692                  * for session "current_session_name"
1693                  * Name of the output
1694                  */
1695                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1696                                 name);
1697                 if (ret) {
1698                         goto end;
1699                 }
1700         }
1701
1702         /* Snapshot was deleted for session "current_session_name"*/
1703         ret = mi_lttng_writer_write_element_string(writer,
1704                         mi_lttng_element_snapshot_session_name,
1705                         current_session_name);
1706         if (ret) {
1707                 goto end;
1708         }
1709
1710         /* Close snapshot element */
1711         ret = mi_lttng_writer_close_element(writer);
1712
1713 end:
1714         return ret;
1715 }
1716
1717 LTTNG_HIDDEN
1718 int mi_lttng_snapshot_add_output(struct mi_writer *writer,
1719                 const char *current_session_name, const char *n_ptr,
1720                 struct lttng_snapshot_output *output)
1721 {
1722         int ret;
1723
1724         /* Open element snapshot */
1725         ret = mi_lttng_writer_open_element(writer,
1726                         mi_lttng_element_command_snapshot);
1727         if (ret) {
1728                 goto end;
1729         }
1730
1731         /* Snapshot output id */
1732         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1733                         mi_lttng_element_id, output->id);
1734         if (ret) {
1735                 goto end;
1736         }
1737
1738         /* Snapshot output names */
1739         ret = mi_lttng_writer_write_element_string(writer,
1740                         config_element_name, n_ptr);
1741         if (ret) {
1742                 goto end;
1743         }
1744
1745         /* Destination of the output (ctrl_url)*/
1746         ret = mi_lttng_writer_write_element_string(writer,
1747                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1748         if (ret) {
1749                 goto end;
1750         }
1751
1752         /* Snapshot added for session "current_session_name"*/
1753         ret = mi_lttng_writer_write_element_string(writer,
1754                         mi_lttng_element_snapshot_session_name, current_session_name);
1755         if (ret) {
1756                 goto end;
1757         }
1758
1759         /* total size of all stream combined */
1760         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1761                         mi_lttng_element_snapshot_max_size, output->max_size);
1762         if (ret) {
1763                 goto end;
1764         }
1765
1766         /* Close snapshot element */
1767         ret = mi_lttng_writer_close_element(writer);
1768
1769 end:
1770         return ret;
1771 }
1772
1773 LTTNG_HIDDEN
1774 int mi_lttng_snapshot_record(struct mi_writer *writer,
1775                 const char *current_session_name, const char *url,
1776                 const char *cmdline_ctrl_url, const char *cmdline_data_url)
1777 {
1778         int ret;
1779
1780         /* Open element snapshot */
1781         ret = mi_lttng_writer_open_element(writer,
1782                         mi_lttng_element_command_snapshot);
1783         if (ret) {
1784                 goto end;
1785         }
1786
1787         /*
1788          * If a valid an URL was given, serialize it,
1789          * else take the command line data and ctrl urls*/
1790         if (url) {
1791                 /* Destination of the output (ctrl_url)*/
1792                 ret = mi_lttng_writer_write_element_string(writer,
1793                                 mi_lttng_element_snapshot_ctrl_url, url);
1794                 if (ret) {
1795                         goto end;
1796                 }
1797         } else if (cmdline_ctrl_url) {
1798                 /* Destination of the output (ctrl_url)*/
1799                 ret = mi_lttng_writer_write_element_string(writer,
1800                                 mi_lttng_element_snapshot_ctrl_url, cmdline_ctrl_url);
1801                 if (ret) {
1802                         goto end;
1803                 }
1804
1805                 /* Destination of the output (data_url) */
1806                 ret = mi_lttng_writer_write_element_string(writer,
1807                                 mi_lttng_element_snapshot_data_url, cmdline_data_url);
1808                 if (ret) {
1809                         goto end;
1810                 }
1811         }
1812
1813         /* Close record_snapshot element */
1814         ret = mi_lttng_writer_close_element(writer);
1815
1816 end:
1817         return ret;
1818 }