src/common/mi-lttng.c

   1 /*
   2  * Copyright (C) 2014 - Jonathan Rajotte <jonathan.r.julien@gmail.com>
   3  *                    - Olivier Cotte <olivier.cotte@polymtl.ca>
   4  * Copyright (C) 2016 - Jérémie Galarneau <jeremie.galarneau@efficios.com>
   5  *
   6  * This program is free software; you can redistribute it and/or modify it
   7  * under the terms of the GNU General Public License, version 2 only, as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful, but WITHOUT
  11  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  12  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  13  * more details.
  14  *
  15  * You should have received a copy of the GNU General Public License along with
  16  * this program; if not, write to the Free Software Foundation, Inc., 51
  17  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  18  */
  19
  20 #define _LGPL_SOURCE
  21 #include <common/config/session-config.h>
  22 #include <common/defaults.h>
  23 #include <lttng/snapshot-internal.h>
  24 #include <lttng/channel.h>
  25 #include "mi-lttng.h"
  26
  27 #include <assert.h>
  28
  29 #define MI_SCHEMA_MAJOR_VERSION 3
  30 #define MI_SCHEMA_MINOR_VERSION 0
  31
  32 /* Machine interface namespace URI */
  33 LTTNG_HIDDEN const char * const mi_lttng_xmlns = "xmlns";
  34 LTTNG_HIDDEN const char * const mi_lttng_xmlns_xsi = "xmlns:xsi";
  35 LTTNG_HIDDEN const char * const mi_lttng_w3_schema_uri = "http://www.w3.org/2001/XMLSchema-instance";
  36 LTTNG_HIDDEN const char * const mi_lttng_schema_location = "xsi:schemaLocation";
  37 LTTNG_HIDDEN const char * const mi_lttng_schema_location_uri =
  38         DEFAULT_LTTNG_MI_NAMESPACE " "
  39         "http://lttng.org/xml/schemas/lttng-mi/" XSTR(MI_SCHEMA_MAJOR_VERSION)
  40         "/lttng-mi-" XSTR(MI_SCHEMA_MAJOR_VERSION) "."
  41         XSTR(MI_SCHEMA_MINOR_VERSION) ".xsd";
  42 LTTNG_HIDDEN const char * const mi_lttng_schema_version = "schemaVersion";
  43 LTTNG_HIDDEN const char * const mi_lttng_schema_version_value = XSTR(MI_SCHEMA_MAJOR_VERSION)
  44         "." XSTR(MI_SCHEMA_MINOR_VERSION);
  45
  46 /* Strings related to command */
  47 const char * const mi_lttng_element_command = "command";
  48 const char * const mi_lttng_element_command_action = "snapshot_action";
  49 const char * const mi_lttng_element_command_add_context = "add-context";
  50 const char * const mi_lttng_element_command_create = "create";
  51 const char * const mi_lttng_element_command_destroy = "destroy";
  52 const char * const mi_lttng_element_command_disable_channel = "disable-channel";
  53 const char * const mi_lttng_element_command_disable_event = "disable-event";
  54 const char * const mi_lttng_element_command_enable_channels = "enable-channel";
  55 const char * const mi_lttng_element_command_enable_event = "enable-event";
  56 const char * const mi_lttng_element_command_list = "list";
  57 const char * const mi_lttng_element_command_load = "load";
  58 LTTNG_HIDDEN const char * const mi_lttng_element_command_metadata = "metadata";
  59 LTTNG_HIDDEN const char * const mi_lttng_element_command_metadata_action = "metadata_action";
  60 LTTNG_HIDDEN const char * const mi_lttng_element_command_regenerate = "regenerate";
  61 LTTNG_HIDDEN const char * const mi_lttng_element_command_regenerate_action = "regenerate_action";
  62 const char * const mi_lttng_element_command_name = "name";
  63 const char * const mi_lttng_element_command_output = "output";
  64 const char * const mi_lttng_element_command_save = "save";
  65 const char * const mi_lttng_element_command_set_session = "set-session";
  66 const char * const mi_lttng_element_command_snapshot = "snapshot";
  67 const char * const mi_lttng_element_command_snapshot_add = "add_snapshot";
  68 const char * const mi_lttng_element_command_snapshot_del = "del_snapshot";
  69 const char * const mi_lttng_element_command_snapshot_list = "list_snapshot";
  70 const char * const mi_lttng_element_command_snapshot_record = "record_snapshot";
  71 const char * const mi_lttng_element_command_start = "start";
  72 const char * const mi_lttng_element_command_stop = "stop";
  73 const char * const mi_lttng_element_command_success = "success";
  74 const char * const mi_lttng_element_command_track = "track";
  75 const char * const mi_lttng_element_command_untrack = "untrack";
  76 const char * const mi_lttng_element_command_version = "version";
  77 const char * const mi_lttng_element_command_rotate = "rotate";
  78 const char * const mi_lttng_element_command_enable_rotation = "enable-rotation";
  79 const char * const mi_lttng_element_command_disable_rotation = "disable-rotation";
  80
  81 /* Strings related to version command */
  82 const char * const mi_lttng_element_version = "version";
  83 const char * const mi_lttng_element_version_commit = "commit";
  84 const char * const mi_lttng_element_version_description = "description";
  85 const char * const mi_lttng_element_version_license = "license";
  86 const char * const mi_lttng_element_version_major = "major";
  87 const char * const mi_lttng_element_version_minor = "minor";
  88 const char * const mi_lttng_element_version_patch_level = "patchLevel";
  89 const char * const mi_lttng_element_version_str = "string";
  90 const char * const mi_lttng_element_version_web = "url";
  91
  92 /* String related to a lttng_event_field */
  93 const char * const mi_lttng_element_event_field = "event_field";
  94 const char * const mi_lttng_element_event_fields = "event_fields";
  95
  96 /* String related to lttng_event_perf_counter_ctx */
  97 const char * const mi_lttng_element_perf_counter_context = "perf";
  98
  99 /* Strings related to pid */
 100 const char * const mi_lttng_element_pid_id = "id";
 101
 102 /* Strings related to save command */
 103 const char * const mi_lttng_element_save = "save";
 104
 105 /* Strings related to load command */
 106 const char * const mi_lttng_element_load = "load";
 107 LTTNG_HIDDEN const char * const mi_lttng_element_load_overrides = "overrides";
 108 LTTNG_HIDDEN const char * const mi_lttng_element_load_override_url = "url";
 109
 110 /* General elements of mi_lttng */
 111 const char * const mi_lttng_element_empty = "";
 112 const char * const mi_lttng_element_id = "id";
 113 const char * const mi_lttng_element_nowrite = "nowrite";
 114 const char * const mi_lttng_element_success = "success";
 115 const char * const mi_lttng_element_type_enum = "ENUM";
 116 const char * const mi_lttng_element_type_float = "FLOAT";
 117 const char * const mi_lttng_element_type_integer = "INTEGER";
 118 const char * const mi_lttng_element_type_other = "OTHER";
 119 const char * const mi_lttng_element_type_string = "STRING";
 120
 121 /* String related to loglevel */
 122 const char * const mi_lttng_loglevel_str_alert = "TRACE_ALERT";
 123 const char * const mi_lttng_loglevel_str_crit = "TRACE_CRIT";
 124 const char * const mi_lttng_loglevel_str_debug = "TRACE_DEBUG";
 125 const char * const mi_lttng_loglevel_str_debug_function = "TRACE_DEBUG_FUNCTION";
 126 const char * const mi_lttng_loglevel_str_debug_line = "TRACE_DEBUG_LINE";
 127 const char * const mi_lttng_loglevel_str_debug_module = "TRACE_DEBUG_MODULE";
 128 const char * const mi_lttng_loglevel_str_debug_process = "TRACE_DEBUG_PROCESS";
 129 const char * const mi_lttng_loglevel_str_debug_program = "TRACE_DEBUG_PROGRAM";
 130 const char * const mi_lttng_loglevel_str_debug_system = "TRACE_DEBUG_SYSTEM";
 131 const char * const mi_lttng_loglevel_str_debug_unit = "TRACE_DEBUG_UNIT";
 132 const char * const mi_lttng_loglevel_str_emerg = "TRACE_EMERG";
 133 const char * const mi_lttng_loglevel_str_err = "TRACE_ERR";
 134 const char * const mi_lttng_loglevel_str_info = "TRACE_INFO";
 135 const char * const mi_lttng_loglevel_str_notice = "TRACE_NOTICE";
 136 const char * const mi_lttng_loglevel_str_unknown = "UNKNOWN";
 137 const char * const mi_lttng_loglevel_str_warning = "TRACE_WARNING";
 138
 139 /* String related to loglevel JUL */
 140 const char * const mi_lttng_loglevel_str_jul_all = "JUL_ALL";
 141 const char * const mi_lttng_loglevel_str_jul_config = "JUL_CONFIG";
 142 const char * const mi_lttng_loglevel_str_jul_fine = "JUL_FINE";
 143 const char * const mi_lttng_loglevel_str_jul_finer = "JUL_FINER";
 144 const char * const mi_lttng_loglevel_str_jul_finest = "JUL_FINEST";
 145 const char * const mi_lttng_loglevel_str_jul_info = "JUL_INFO";
 146 const char * const mi_lttng_loglevel_str_jul_off = "JUL_OFF";
 147 const char * const mi_lttng_loglevel_str_jul_severe = "JUL_SEVERE";
 148 const char * const mi_lttng_loglevel_str_jul_warning = "JUL_WARNING";
 149
 150 /* String related to loglevel LOG4J */
 151 const char * const mi_lttng_loglevel_str_log4j_off = "LOG4J_OFF";
 152 const char * const mi_lttng_loglevel_str_log4j_fatal = "LOG4J_FATAL";
 153 const char * const mi_lttng_loglevel_str_log4j_error = "LOG4J_ERROR";
 154 const char * const mi_lttng_loglevel_str_log4j_warn = "LOG4J_WARN";
 155 const char * const mi_lttng_loglevel_str_log4j_info = "LOG4J_INFO";
 156 const char * const mi_lttng_loglevel_str_log4j_debug = "LOG4J_DEBUG";
 157 const char * const mi_lttng_loglevel_str_log4j_trace = "LOG4J_TRACE";
 158 const char * const mi_lttng_loglevel_str_log4j_all = "LOG4J_ALL";
 159
 160 /* String related to loglevel Python */
 161 const char * const mi_lttng_loglevel_str_python_critical = "PYTHON_CRITICAL";
 162 const char * const mi_lttng_loglevel_str_python_error = "PYTHON_ERROR";
 163 const char * const mi_lttng_loglevel_str_python_warning = "PYTHON_WARNING";
 164 const char * const mi_lttng_loglevel_str_python_info = "PYTHON_INFO";
 165 const char * const mi_lttng_loglevel_str_python_debug = "PYTHON_DEBUG";
 166 const char * const mi_lttng_loglevel_str_python_notset = "PYTHON_NOTSET";
 167
 168 /* String related to loglevel type */
 169 const char * const mi_lttng_loglevel_type_all = "ALL";
 170 const char * const mi_lttng_loglevel_type_range = "RANGE";
 171 const char * const mi_lttng_loglevel_type_single = "SINGLE";
 172 const char * const mi_lttng_loglevel_type_unknown = "UNKNOWN";
 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 LTTNG_HIDDEN const char * const mi_lttng_element_session_name = "session_name";
 186
 187 /* String related to rotate command */
 188 LTTNG_HIDDEN const char * const mi_lttng_element_rotation = "rotation";
 189 LTTNG_HIDDEN const char * const mi_lttng_element_rotations = "rotations";
 190 LTTNG_HIDDEN const char * const mi_lttng_element_rotate_status = "status";
 191 LTTNG_HIDDEN const char * const mi_lttng_element_rotation_schedule = "rotation_schedule";
 192
 193 /* Deprecated symbols preserved for ABI compatibility. */
 194 const char * const mi_lttng_context_type_perf_counter;
 195 const char * const mi_lttng_context_type_perf_cpu_counter;
 196 const char * const mi_lttng_context_type_perf_thread_counter;
 197 const char * const mi_lttng_element_track_untrack_pid_target;
 198 const char * const mi_lttng_element_track_untrack_targets;
 199 const char * const mi_lttng_element_calibrate;
 200 const char * const mi_lttng_element_calibrate_function;
 201 const char * const mi_lttng_element_command_calibrate;
 202
 203 /* This is a merge of jul loglevel and regular loglevel
 204  * Those should never overlap by definition
 205  * (see struct lttng_event loglevel)
 206  */
 207 LTTNG_HIDDEN
 208 const char *mi_lttng_loglevel_string(int value, enum lttng_domain_type domain)
 209 {
 210         switch (domain) {
 211         case LTTNG_DOMAIN_KERNEL:
 212         case LTTNG_DOMAIN_UST:
 213                 switch (value) {
 214                 case -1:
 215                         return mi_lttng_element_empty;
 216                 case LTTNG_LOGLEVEL_EMERG:
 217                         return mi_lttng_loglevel_str_emerg;
 218                 case LTTNG_LOGLEVEL_ALERT:
 219                         return mi_lttng_loglevel_str_alert;
 220                 case LTTNG_LOGLEVEL_CRIT:
 221                         return mi_lttng_loglevel_str_crit;
 222                 case LTTNG_LOGLEVEL_ERR:
 223                         return mi_lttng_loglevel_str_err;
 224                 case LTTNG_LOGLEVEL_WARNING:
 225                         return mi_lttng_loglevel_str_warning;
 226                 case LTTNG_LOGLEVEL_NOTICE:
 227                         return mi_lttng_loglevel_str_notice;
 228                 case LTTNG_LOGLEVEL_INFO:
 229                         return mi_lttng_loglevel_str_info;
 230                 case LTTNG_LOGLEVEL_DEBUG_SYSTEM:
 231                         return mi_lttng_loglevel_str_debug_system;
 232                 case LTTNG_LOGLEVEL_DEBUG_PROGRAM:
 233                         return mi_lttng_loglevel_str_debug_program;
 234                 case LTTNG_LOGLEVEL_DEBUG_PROCESS:
 235                         return mi_lttng_loglevel_str_debug_process;
 236                 case LTTNG_LOGLEVEL_DEBUG_MODULE:
 237                         return mi_lttng_loglevel_str_debug_module;
 238                 case LTTNG_LOGLEVEL_DEBUG_UNIT:
 239                         return mi_lttng_loglevel_str_debug_unit;
 240                 case LTTNG_LOGLEVEL_DEBUG_FUNCTION:
 241                         return mi_lttng_loglevel_str_debug_function;
 242                 case LTTNG_LOGLEVEL_DEBUG_LINE:
 243                         return mi_lttng_loglevel_str_debug_line;
 244                 case LTTNG_LOGLEVEL_DEBUG:
 245                         return mi_lttng_loglevel_str_debug;
 246                 default:
 247                         return mi_lttng_loglevel_str_unknown;
 248                 }
 249                 break;
 250         case LTTNG_DOMAIN_LOG4J:
 251                 switch (value) {
 252                 case -1:
 253                         return mi_lttng_element_empty;
 254                 case LTTNG_LOGLEVEL_LOG4J_OFF:
 255                         return mi_lttng_loglevel_str_log4j_off;
 256                 case LTTNG_LOGLEVEL_LOG4J_FATAL:
 257                         return mi_lttng_loglevel_str_log4j_fatal;
 258                 case LTTNG_LOGLEVEL_LOG4J_ERROR:
 259                         return mi_lttng_loglevel_str_log4j_error;
 260                 case LTTNG_LOGLEVEL_LOG4J_WARN:
 261                         return mi_lttng_loglevel_str_log4j_warn;
 262                 case LTTNG_LOGLEVEL_LOG4J_INFO:
 263                         return mi_lttng_loglevel_str_log4j_info;
 264                 case LTTNG_LOGLEVEL_LOG4J_DEBUG:
 265                         return mi_lttng_loglevel_str_log4j_debug;
 266                 case LTTNG_LOGLEVEL_LOG4J_TRACE:
 267                         return mi_lttng_loglevel_str_log4j_trace;
 268                 case LTTNG_LOGLEVEL_LOG4J_ALL:
 269                         return mi_lttng_loglevel_str_log4j_all;
 270                 default:
 271                         return mi_lttng_loglevel_str_unknown;
 272                 }
 273                 break;
 274         case LTTNG_DOMAIN_JUL:
 275                 switch (value) {
 276                 case -1:
 277                         return mi_lttng_element_empty;
 278                 case LTTNG_LOGLEVEL_JUL_OFF:
 279                         return mi_lttng_loglevel_str_jul_off;
 280                 case LTTNG_LOGLEVEL_JUL_SEVERE:
 281                         return mi_lttng_loglevel_str_jul_severe;
 282                 case LTTNG_LOGLEVEL_JUL_WARNING:
 283                         return mi_lttng_loglevel_str_jul_warning;
 284                 case LTTNG_LOGLEVEL_JUL_INFO:
 285                         return mi_lttng_loglevel_str_jul_info;
 286                 case LTTNG_LOGLEVEL_JUL_CONFIG:
 287                         return mi_lttng_loglevel_str_jul_config;
 288                 case LTTNG_LOGLEVEL_JUL_FINE:
 289                         return mi_lttng_loglevel_str_jul_fine;
 290                 case LTTNG_LOGLEVEL_JUL_FINER:
 291                         return mi_lttng_loglevel_str_jul_finer;
 292                 case LTTNG_LOGLEVEL_JUL_FINEST:
 293                         return mi_lttng_loglevel_str_jul_finest;
 294                 case LTTNG_LOGLEVEL_JUL_ALL:
 295                         return mi_lttng_loglevel_str_jul_all;
 296                 default:
 297                         return mi_lttng_loglevel_str_unknown;
 298                 }
 299                 break;
 300         case LTTNG_DOMAIN_PYTHON:
 301                 switch (value) {
 302                 case LTTNG_LOGLEVEL_PYTHON_CRITICAL:
 303                         return mi_lttng_loglevel_str_python_critical;
 304                 case LTTNG_LOGLEVEL_PYTHON_ERROR:
 305                         return mi_lttng_loglevel_str_python_error;
 306                 case LTTNG_LOGLEVEL_PYTHON_WARNING:
 307                         return mi_lttng_loglevel_str_python_warning;
 308                 case LTTNG_LOGLEVEL_PYTHON_INFO:
 309                         return mi_lttng_loglevel_str_python_info;
 310                 case LTTNG_LOGLEVEL_PYTHON_DEBUG:
 311                         return mi_lttng_loglevel_str_python_debug;
 312                 case LTTNG_LOGLEVEL_PYTHON_NOTSET:
 313                         return mi_lttng_loglevel_str_python_notset;
 314                 default:
 315                         return mi_lttng_loglevel_str_unknown;
 316                 }
 317                 break;
 318         default:
 319                 return mi_lttng_loglevel_str_unknown;
 320         }
 321 }
 322
 323 LTTNG_HIDDEN
 324 const char *mi_lttng_logleveltype_string(enum lttng_loglevel_type value)
 325 {
 326         switch (value) {
 327         case LTTNG_EVENT_LOGLEVEL_ALL:
 328                 return mi_lttng_loglevel_type_all;
 329         case LTTNG_EVENT_LOGLEVEL_RANGE:
 330                 return mi_lttng_loglevel_type_range;
 331         case LTTNG_EVENT_LOGLEVEL_SINGLE:
 332                 return mi_lttng_loglevel_type_single;
 333         default:
 334                 return mi_lttng_loglevel_type_unknown;
 335         }
 336 }
 337
 338 LTTNG_HIDDEN
 339 const char *mi_lttng_eventtype_string(enum lttng_event_type value)
 340 {
 341         switch (value) {
 342         case LTTNG_EVENT_ALL:
 343                 return config_event_type_all;
 344         case LTTNG_EVENT_TRACEPOINT:
 345                 return config_event_type_tracepoint;
 346         case LTTNG_EVENT_PROBE:
 347                 return config_event_type_probe;
 348         case LTTNG_EVENT_FUNCTION:
 349                 return config_event_type_function;
 350         case LTTNG_EVENT_FUNCTION_ENTRY:
 351                 return config_event_type_function_entry;
 352         case LTTNG_EVENT_SYSCALL:
 353                 return config_event_type_syscall;
 354         case LTTNG_EVENT_NOOP:
 355                 return config_event_type_noop;
 356         default:
 357                 return mi_lttng_element_empty;
 358         }
 359 }
 360
 361 static
 362 const char *mi_lttng_event_contexttype_string(enum lttng_event_context_type val)
 363 {
 364         switch (val) {
 365         case LTTNG_EVENT_CONTEXT_PID:
 366                 return config_event_context_pid;
 367         case LTTNG_EVENT_CONTEXT_PROCNAME:
 368                 return config_event_context_procname;
 369         case LTTNG_EVENT_CONTEXT_PRIO:
 370                 return config_event_context_prio;
 371         case LTTNG_EVENT_CONTEXT_NICE:
 372                 return config_event_context_nice;
 373         case LTTNG_EVENT_CONTEXT_VPID:
 374                 return config_event_context_vpid;
 375         case LTTNG_EVENT_CONTEXT_TID:
 376                 return config_event_context_tid;
 377         case LTTNG_EVENT_CONTEXT_VTID:
 378                 return config_event_context_vtid;
 379         case LTTNG_EVENT_CONTEXT_PPID:
 380                 return config_event_context_ppid;
 381         case LTTNG_EVENT_CONTEXT_VPPID:
 382                 return config_event_context_vppid;
 383         case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
 384                 return config_event_context_pthread_id;
 385         case LTTNG_EVENT_CONTEXT_HOSTNAME:
 386                 return config_event_context_hostname;
 387         case LTTNG_EVENT_CONTEXT_IP:
 388                 return config_event_context_ip;
 389         case LTTNG_EVENT_CONTEXT_INTERRUPTIBLE:
 390                 return config_event_context_interruptible;
 391         case LTTNG_EVENT_CONTEXT_PREEMPTIBLE:
 392                 return config_event_context_preemptible;
 393         case LTTNG_EVENT_CONTEXT_NEED_RESCHEDULE:
 394                 return config_event_context_need_reschedule;
 395         case LTTNG_EVENT_CONTEXT_MIGRATABLE:
 396                 return config_event_context_migratable;
 397         default:
 398                 return NULL;
 399         }
 400 }
 401
 402 LTTNG_HIDDEN
 403 const char *mi_lttng_eventfieldtype_string(enum lttng_event_field_type val)
 404 {
 405         switch (val) {
 406         case(LTTNG_EVENT_FIELD_INTEGER):
 407                 return mi_lttng_element_type_integer;
 408         case(LTTNG_EVENT_FIELD_ENUM):
 409                 return mi_lttng_element_type_enum;
 410         case(LTTNG_EVENT_FIELD_FLOAT):
 411                 return mi_lttng_element_type_float;
 412         case(LTTNG_EVENT_FIELD_STRING):
 413                 return mi_lttng_element_type_string;
 414         default:
 415                 return mi_lttng_element_type_other;
 416         }
 417 }
 418
 419 LTTNG_HIDDEN
 420 const char *mi_lttng_domaintype_string(enum lttng_domain_type value)
 421 {
 422         /* Note: This is a *duplicate* of get_domain_str from bin/lttng/utils.c */
 423         switch (value) {
 424         case LTTNG_DOMAIN_KERNEL:
 425                 return config_domain_type_kernel;
 426         case LTTNG_DOMAIN_UST:
 427                 return config_domain_type_ust;
 428         case LTTNG_DOMAIN_JUL:
 429                 return config_domain_type_jul;
 430         case LTTNG_DOMAIN_LOG4J:
 431                 return config_domain_type_log4j;
 432         case LTTNG_DOMAIN_PYTHON:
 433                 return config_domain_type_python;
 434         default:
 435                 /* Should not have an unknown domain */
 436                 assert(0);
 437                 return NULL;
 438         }
 439 }
 440
 441 LTTNG_HIDDEN
 442 const char *mi_lttng_buffertype_string(enum lttng_buffer_type value)
 443 {
 444         switch (value) {
 445         case LTTNG_BUFFER_PER_PID:
 446                 return config_buffer_type_per_pid;
 447         case LTTNG_BUFFER_PER_UID:
 448                 return config_buffer_type_per_uid;
 449         case LTTNG_BUFFER_GLOBAL:
 450                 return config_buffer_type_global;
 451         default:
 452                 /* Should not have an unknow buffer type */
 453                 assert(0);
 454                 return NULL;
 455         }
 456 }
 457
 458 LTTNG_HIDDEN
 459 struct mi_writer *mi_lttng_writer_create(int fd_output, int mi_output_type)
 460 {
 461         struct mi_writer *mi_writer;
 462
 463         mi_writer = zmalloc(sizeof(struct mi_writer));
 464         if (!mi_writer) {
 465                 PERROR("zmalloc mi_writer_create");
 466                 goto end;
 467         }
 468         if (mi_output_type == LTTNG_MI_XML) {
 469                 mi_writer->writer = config_writer_create(fd_output, 0);
 470                 if (!mi_writer->writer) {
 471                         goto err_destroy;
 472                 }
 473                 mi_writer->type = LTTNG_MI_XML;
 474         } else {
 475                 goto err_destroy;
 476         }
 477
 478 end:
 479         return mi_writer;
 480
 481 err_destroy:
 482         free(mi_writer);
 483         return NULL;
 484 }
 485
 486 LTTNG_HIDDEN
 487 int mi_lttng_writer_destroy(struct mi_writer *writer)
 488 {
 489         int ret;
 490
 491         if (!writer) {
 492                 ret = -EINVAL;
 493                 goto end;
 494         }
 495
 496         ret = config_writer_destroy(writer->writer);
 497         if (ret < 0) {
 498                 goto end;
 499         }
 500
 501         free(writer);
 502 end:
 503         return ret;
 504 }
 505
 506 LTTNG_HIDDEN
 507 int mi_lttng_writer_command_open(struct mi_writer *writer, const char *command)
 508 {
 509         int ret;
 510
 511         /*
 512          * A command is always the MI's root node, it must declare the current
 513          * namespace and schema URIs and the schema's version.
 514          */
 515         ret = config_writer_open_element(writer->writer,
 516                         mi_lttng_element_command);
 517         if (ret) {
 518                 goto end;
 519         }
 520
 521         ret = config_writer_write_attribute(writer->writer,
 522                         mi_lttng_xmlns, DEFAULT_LTTNG_MI_NAMESPACE);
 523         if (ret) {
 524                 goto end;
 525         }
 526
 527         ret = config_writer_write_attribute(writer->writer,
 528                         mi_lttng_xmlns_xsi, mi_lttng_w3_schema_uri);
 529         if (ret) {
 530                 goto end;
 531         }
 532
 533         ret = config_writer_write_attribute(writer->writer,
 534                         mi_lttng_schema_location,
 535                         mi_lttng_schema_location_uri);
 536         if (ret) {
 537                 goto end;
 538         }
 539
 540         ret = config_writer_write_attribute(writer->writer,
 541                         mi_lttng_schema_version,
 542                         mi_lttng_schema_version_value);
 543         if (ret) {
 544                 goto end;
 545         }
 546
 547         ret = mi_lttng_writer_write_element_string(writer,
 548                         mi_lttng_element_command_name, command);
 549 end:
 550         return ret;
 551 }
 552
 553 LTTNG_HIDDEN
 554 int mi_lttng_writer_command_close(struct mi_writer *writer)
 555 {
 556         return mi_lttng_writer_close_element(writer);
 557 }
 558
 559 LTTNG_HIDDEN
 560 int mi_lttng_writer_open_element(struct mi_writer *writer,
 561                 const char *element_name)
 562 {
 563         return config_writer_open_element(writer->writer, element_name);
 564 }
 565
 566 LTTNG_HIDDEN
 567 int mi_lttng_writer_close_element(struct mi_writer *writer)
 568 {
 569         return config_writer_close_element(writer->writer);
 570 }
 571
 572 LTTNG_HIDDEN
 573 int mi_lttng_close_multi_element(struct mi_writer *writer,
 574                 unsigned int nb_element)
 575 {
 576         int ret, i;
 577
 578         if (nb_element < 1) {
 579                 ret = 0;
 580                 goto end;
 581         }
 582         for (i = 0; i < nb_element; i++) {
 583                 ret = mi_lttng_writer_close_element(writer);
 584                 if (ret) {
 585                         goto end;
 586                 }
 587         }
 588 end:
 589         return ret;
 590 }
 591
 592 LTTNG_HIDDEN
 593 int mi_lttng_writer_write_element_unsigned_int(struct mi_writer *writer,
 594                 const char *element_name, uint64_t value)
 595 {
 596         return config_writer_write_element_unsigned_int(writer->writer,
 597                         element_name, value);
 598 }
 599
 600 LTTNG_HIDDEN
 601 int mi_lttng_writer_write_element_signed_int(struct mi_writer *writer,
 602                 const char *element_name, int64_t value)
 603 {
 604         return config_writer_write_element_signed_int(writer->writer,
 605                         element_name, value);
 606 }
 607
 608 LTTNG_HIDDEN
 609 int mi_lttng_writer_write_element_bool(struct mi_writer *writer,
 610                 const char *element_name, int value)
 611 {
 612         return config_writer_write_element_bool(writer->writer,
 613                         element_name, value);
 614 }
 615
 616 LTTNG_HIDDEN
 617 int mi_lttng_writer_write_element_string(struct mi_writer *writer,
 618                 const char *element_name, const char *value)
 619 {
 620         return config_writer_write_element_string(writer->writer,
 621                         element_name, value);
 622 }
 623
 624 LTTNG_HIDDEN
 625 int mi_lttng_version(struct mi_writer *writer, struct mi_lttng_version *version,
 626         const char *lttng_description, const char *lttng_license)
 627 {
 628         int ret;
 629
 630         /* Open version */
 631         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_version);
 632         if (ret) {
 633                 goto end;
 634         }
 635
 636         /* Version string (contain info like rc etc.) */
 637         ret = mi_lttng_writer_write_element_string(writer,
 638                         mi_lttng_element_version_str, version->version);
 639         if (ret) {
 640                 goto end;
 641         }
 642
 643         /* Major version number */
 644         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 645                         mi_lttng_element_version_major, version->version_major);
 646         if (ret) {
 647                 goto end;
 648         }
 649
 650         /* Minor version number */
 651         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 652                         mi_lttng_element_version_minor, version->version_minor);
 653         if (ret) {
 654                 goto end;
 655         }
 656
 657         /* Commit version number */
 658         ret = mi_lttng_writer_write_element_string(writer,
 659                         mi_lttng_element_version_commit, version->version_commit);
 660         if (ret) {
 661                 goto end;
 662         }
 663
 664         /* Patch number */
 665         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 666                         mi_lttng_element_version_patch_level, version->version_patchlevel);
 667         if (ret) {
 668                 goto end;
 669         }
 670
 671         /* Name of the version */
 672         ret = mi_lttng_writer_write_element_string(writer,
 673                         config_element_name, version->version_name);
 674         if (ret) {
 675                 goto end;
 676         }
 677
 678         /* Description mostly related to beer... */
 679         ret = mi_lttng_writer_write_element_string(writer,
 680                         mi_lttng_element_version_description, lttng_description);
 681         if (ret) {
 682                 goto end;
 683         }
 684
 685         /* url */
 686         ret = mi_lttng_writer_write_element_string(writer,
 687                         mi_lttng_element_version_web, version->package_url);
 688         if (ret) {
 689                 goto end;
 690         }
 691
 692         /* License: free as in free beer...no...*speech* */
 693         ret = mi_lttng_writer_write_element_string(writer,
 694                         mi_lttng_element_version_license, lttng_license);
 695         if (ret) {
 696                 goto end;
 697         }
 698
 699         /* Close version element */
 700         ret = mi_lttng_writer_close_element(writer);
 701
 702 end:
 703         return ret;
 704 }
 705
 706 LTTNG_HIDDEN
 707 int mi_lttng_sessions_open(struct mi_writer *writer)
 708 {
 709         return mi_lttng_writer_open_element(writer, config_element_sessions);
 710 }
 711
 712 LTTNG_HIDDEN
 713 int mi_lttng_session(struct mi_writer *writer,
 714                 struct lttng_session *session, int is_open)
 715 {
 716         int ret;
 717
 718         assert(session);
 719
 720         /* Open sessions element */
 721         ret = mi_lttng_writer_open_element(writer,
 722                         config_element_session);
 723         if (ret) {
 724                 goto end;
 725         }
 726
 727         /* Name of the session */
 728         ret = mi_lttng_writer_write_element_string(writer,
 729                         config_element_name, session->name);
 730         if (ret) {
 731                 goto end;
 732         }
 733
 734         /* Path */
 735         ret = mi_lttng_writer_write_element_string(writer,
 736                         config_element_path, session->path);
 737         if (ret) {
 738                 goto end;
 739         }
 740
 741         /* Enabled ? */
 742         ret = mi_lttng_writer_write_element_bool(writer,
 743                         config_element_enabled, session->enabled);
 744         if (ret) {
 745                 goto end;
 746         }
 747
 748         /* Snapshot mode */
 749         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 750                         config_element_snapshot_mode, session->snapshot_mode);
 751         if (ret) {
 752                 goto end;
 753         }
 754
 755         /* Live timer interval in usec */
 756         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 757                         config_element_live_timer_interval,
 758                         session->live_timer_interval);
 759         if (ret) {
 760                 goto end;
 761         }
 762
 763         if (!is_open) {
 764                 /* Closing session element */
 765                 ret = mi_lttng_writer_close_element(writer);
 766         }
 767 end:
 768         return ret;
 769
 770 }
 771
 772 LTTNG_HIDDEN
 773 int mi_lttng_domains_open(struct mi_writer *writer)
 774 {
 775         return mi_lttng_writer_open_element(writer, config_element_domains);
 776 }
 777
 778 LTTNG_HIDDEN
 779 int mi_lttng_domain(struct mi_writer *writer,
 780                 struct lttng_domain *domain, int is_open)
 781 {
 782         int ret = 0;
 783         const char *str_domain;
 784         const char *str_buffer;
 785
 786         assert(domain);
 787
 788         /* Open domain element */
 789         ret = mi_lttng_writer_open_element(writer, config_element_domain);
 790         if (ret) {
 791                 goto end;
 792         }
 793
 794         /* Domain Type */
 795         str_domain = mi_lttng_domaintype_string(domain->type);
 796         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
 797                         str_domain);
 798         if (ret) {
 799                 goto end;
 800         }
 801
 802         /* Buffer Type */
 803         str_buffer= mi_lttng_buffertype_string(domain->buf_type);
 804         ret = mi_lttng_writer_write_element_string(writer,
 805                         config_element_buffer_type, str_buffer);
 806         if (ret) {
 807                 goto end;
 808         }
 809
 810         /* TODO: union  attr
 811          * This union is not currently used and was added for
 812          * future ust domain support.
 813          * Date: 25-06-2014
 814          * */
 815
 816         if (!is_open) {
 817                 /* Closing domain element */
 818                 ret = mi_lttng_writer_close_element(writer);
 819         }
 820
 821 end:
 822         return ret;
 823
 824 }
 825
 826 LTTNG_HIDDEN
 827 int mi_lttng_channels_open(struct mi_writer *writer)
 828 {
 829         return mi_lttng_writer_open_element(writer, config_element_channels);
 830 }
 831
 832 LTTNG_HIDDEN
 833 int mi_lttng_channel(struct mi_writer *writer,
 834                 struct lttng_channel *channel, int is_open)
 835 {
 836         int ret = 0;
 837
 838         assert(channel);
 839
 840         /* Opening channel element */
 841         ret = mi_lttng_writer_open_element(writer, config_element_channel);
 842         if (ret) {
 843                 goto end;
 844         }
 845
 846         /* Name */
 847         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
 848                         channel->name);
 849         if (ret) {
 850                 goto end;
 851         }
 852
 853         /* Enabled ? */
 854         ret = mi_lttng_writer_write_element_bool(writer,
 855                         config_element_enabled, channel->enabled);
 856         if (ret) {
 857                 goto end;
 858         }
 859
 860         /* Attribute */
 861         ret = mi_lttng_channel_attr(writer, &channel->attr);
 862         if (ret) {
 863                 goto end;
 864         }
 865
 866         if (!is_open) {
 867                 /* Closing channel element */
 868                 ret = mi_lttng_writer_close_element(writer);
 869                 if (ret) {
 870                         goto end;
 871                 }
 872         }
 873 end:
 874         return ret;
 875 }
 876
 877 LTTNG_HIDDEN
 878 int mi_lttng_channel_attr(struct mi_writer *writer,
 879                 struct lttng_channel_attr *attr)
 880 {
 881         int ret = 0;
 882         struct lttng_channel *chan = caa_container_of(attr,
 883                         struct lttng_channel, attr);
 884         uint64_t discarded_events, lost_packets, monitor_timer_interval;
 885         int64_t blocking_timeout;
 886
 887         assert(attr);
 888
 889         ret = lttng_channel_get_discarded_event_count(chan, &discarded_events);
 890         if (ret) {
 891                 goto end;
 892         }
 893
 894         ret = lttng_channel_get_lost_packet_count(chan, &lost_packets);
 895         if (ret) {
 896                 goto end;
 897         }
 898
 899         ret = lttng_channel_get_monitor_timer_interval(chan,
 900                         &monitor_timer_interval);
 901         if (ret) {
 902                 goto end;
 903         }
 904
 905         ret = lttng_channel_get_blocking_timeout(chan,
 906                         &blocking_timeout);
 907         if (ret) {
 908                 goto end;
 909         }
 910
 911         /* Opening Attributes */
 912         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
 913         if (ret) {
 914                 goto end;
 915         }
 916
 917         /* Overwrite */
 918         ret = mi_lttng_writer_write_element_string(writer,
 919                 config_element_overwrite_mode,
 920                 attr->overwrite ? config_overwrite_mode_overwrite :
 921                         config_overwrite_mode_discard);
 922         if (ret) {
 923                 goto end;
 924         }
 925
 926         /* Sub buffer size in byte */
 927         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 928                 config_element_subbuf_size, attr->subbuf_size);
 929         if (ret) {
 930                 goto end;
 931         }
 932
 933         /* Number of subbuffer (power of two) */
 934         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 935                 config_element_num_subbuf,
 936                 attr->num_subbuf);
 937         if (ret) {
 938                 goto end;
 939         }
 940
 941         /* Switch timer interval in usec */
 942         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 943                 config_element_switch_timer_interval,
 944                 attr->switch_timer_interval);
 945         if (ret) {
 946                 goto end;
 947         }
 948
 949         /* Read timer interval in usec */
 950         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 951                 config_element_read_timer_interval,
 952                 attr->read_timer_interval);
 953         if (ret) {
 954                 goto end;
 955         }
 956
 957         /* Monitor timer interval in usec */
 958         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 959                 config_element_monitor_timer_interval,
 960                 monitor_timer_interval);
 961         if (ret) {
 962                 goto end;
 963         }
 964
 965         /* Retry timeout in usec */
 966         ret = mi_lttng_writer_write_element_signed_int(writer,
 967                 config_element_blocking_timeout,
 968                 blocking_timeout);
 969         if (ret) {
 970                 goto end;
 971         }
 972
 973         /* Event output */
 974         ret = mi_lttng_writer_write_element_string(writer,
 975                 config_element_output_type,
 976                 attr->output == LTTNG_EVENT_SPLICE ?
 977                 config_output_type_splice : config_output_type_mmap);
 978         if (ret) {
 979                 goto end;
 980         }
 981
 982         /* Tracefile size in bytes */
 983         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 984                 config_element_tracefile_size, attr->tracefile_size);
 985         if (ret) {
 986                 goto end;
 987         }
 988
 989         /* Count of tracefiles */
 990         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 991                 config_element_tracefile_count,
 992                 attr->tracefile_count);
 993         if (ret) {
 994                 goto end;
 995         }
 996
 997         /* Live timer interval in usec*/
 998         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 999                 config_element_live_timer_interval,
1000                 attr->live_timer_interval);
1001         if (ret) {
1002                 goto end;
1003         }
1004
1005         /* Discarded events */
1006         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1007                 config_element_discarded_events,
1008                 discarded_events);
1009         if (ret) {
1010                 goto end;
1011         }
1012
1013         /* Lost packets */
1014         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1015                 config_element_lost_packets,
1016                 lost_packets);
1017         if (ret) {
1018                 goto end;
1019         }
1020
1021         /* Closing attributes */
1022         ret = mi_lttng_writer_close_element(writer);
1023         if (ret) {
1024                 goto end;
1025         }
1026 end:
1027         return ret;
1028
1029 }
1030
1031 LTTNG_HIDDEN
1032 int mi_lttng_event_common_attributes(struct mi_writer *writer,
1033                 struct lttng_event *event)
1034 {
1035         int ret;
1036         const char *filter_expression;
1037
1038         /* Open event element */
1039         ret = mi_lttng_writer_open_element(writer, config_element_event);
1040         if (ret) {
1041                 goto end;
1042         }
1043
1044         /* Event name */
1045         ret = mi_lttng_writer_write_element_string(writer,
1046                         config_element_name, event->name);
1047         if (ret) {
1048                 goto end;
1049         }
1050
1051         /* Event type */
1052         ret = mi_lttng_writer_write_element_string(writer,
1053                         config_element_type, mi_lttng_eventtype_string(event->type));
1054         if (ret) {
1055                 goto end;
1056         }
1057
1058         /* Is event enabled */
1059         ret = mi_lttng_writer_write_element_bool(writer,
1060                         config_element_enabled, event->enabled);
1061         if (ret) {
1062                 goto end;
1063         }
1064
1065         /* Event filter expression */
1066         ret = lttng_event_get_filter_expression(event, &filter_expression);
1067         if (ret) {
1068                 goto end;
1069         }
1070
1071         if (filter_expression) {
1072                 ret = mi_lttng_writer_write_element_string(writer,
1073                                 config_element_filter_expression,
1074                                 filter_expression);
1075                 if (ret) {
1076                         goto end;
1077                 }
1078         }
1079
1080 end:
1081         return ret;
1082 }
1083
1084 static int write_event_exclusions(struct mi_writer *writer,
1085                 struct lttng_event *event)
1086 {
1087         int i;
1088         int ret;
1089         int exclusion_count;
1090
1091         /* Open event exclusions */
1092         ret = mi_lttng_writer_open_element(writer, config_element_exclusions);
1093         if (ret) {
1094                 goto end;
1095         }
1096
1097         exclusion_count = lttng_event_get_exclusion_name_count(event);
1098         if (exclusion_count < 0) {
1099                 ret = exclusion_count;
1100                 goto end;
1101         }
1102
1103         for (i = 0; i < exclusion_count; i++) {
1104                 const char *name;
1105
1106                 ret = lttng_event_get_exclusion_name(event, i, &name);
1107                 if (ret) {
1108                         /* Close exclusions */
1109                         mi_lttng_writer_close_element(writer);
1110                         goto end;
1111                 }
1112
1113                 ret = mi_lttng_writer_write_element_string(writer,
1114                                 config_element_exclusion, name);
1115                 if (ret) {
1116                         /* Close exclusions */
1117                         mi_lttng_writer_close_element(writer);
1118                         goto end;
1119                 }
1120         }
1121
1122         /* Close exclusions */
1123         ret = mi_lttng_writer_close_element(writer);
1124
1125 end:
1126         return ret;
1127 }
1128
1129 LTTNG_HIDDEN
1130 int mi_lttng_event_tracepoint_loglevel(struct mi_writer *writer,
1131                 struct lttng_event *event, enum lttng_domain_type domain)
1132 {
1133         int ret;
1134
1135         /* Event loglevel */
1136         ret = mi_lttng_writer_write_element_string(writer,
1137                         config_element_loglevel,
1138                         mi_lttng_loglevel_string(event->loglevel, domain));
1139         if (ret) {
1140                 goto end;
1141         }
1142
1143         /* Log level type */
1144         ret = mi_lttng_writer_write_element_string(writer,
1145                         config_element_loglevel_type,
1146                         mi_lttng_logleveltype_string(event->loglevel_type));
1147         if (ret) {
1148                 goto end;
1149         }
1150
1151         /* Event exclusions */
1152         ret = write_event_exclusions(writer, event);
1153
1154 end:
1155         return ret;
1156 }
1157
1158 LTTNG_HIDDEN
1159 int mi_lttng_event_tracepoint_no_loglevel(struct mi_writer *writer,
1160                 struct lttng_event *event)
1161 {
1162         /* event exclusion filter */
1163         return write_event_exclusions(writer, event);
1164 }
1165
1166 LTTNG_HIDDEN
1167 int mi_lttng_event_function_probe(struct mi_writer *writer,
1168                 struct lttng_event *event)
1169 {
1170         int ret;
1171
1172         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1173         if (ret) {
1174                 goto end;
1175         }
1176
1177         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1178         if (ret) {
1179                 goto end;
1180         }
1181
1182         if (event->attr.probe.addr != 0) {
1183                 /* event probe address */
1184                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1185                                 config_element_address, event->attr.probe.addr);
1186                 if (ret) {
1187                         goto end;
1188                 }
1189         } else {
1190                 /* event probe offset */
1191                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1192                                 config_element_offset, event->attr.probe.offset);
1193                 if (ret) {
1194                         goto end;
1195                 }
1196
1197                 /* event probe symbol_name */
1198                 ret = mi_lttng_writer_write_element_string(writer,
1199                                 config_element_symbol_name, event->attr.probe.symbol_name);
1200                 if (ret) {
1201                         goto end;
1202                 }
1203         }
1204
1205         /* Close probe_attributes and attributes */
1206         ret = mi_lttng_close_multi_element(writer, 2);
1207 end:
1208         return ret;
1209 }
1210
1211 LTTNG_HIDDEN
1212 int mi_lttng_event_function_entry(struct mi_writer *writer,
1213                 struct lttng_event *event)
1214 {
1215         int ret;
1216
1217         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1218         if (ret) {
1219                 goto end;
1220         }
1221
1222         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1223         if (ret) {
1224                 goto end;
1225         }
1226
1227         /* event probe symbol_name */
1228         ret = mi_lttng_writer_write_element_string(writer,
1229                         config_element_symbol_name, event->attr.ftrace.symbol_name);
1230         if (ret) {
1231                 goto end;
1232         }
1233
1234         /* Close function_attributes and attributes */
1235         ret = mi_lttng_close_multi_element(writer, 2);
1236 end:
1237         return ret;
1238 }
1239
1240 LTTNG_HIDDEN
1241 int mi_lttng_events_open(struct mi_writer *writer)
1242 {
1243         return mi_lttng_writer_open_element(writer, config_element_events);
1244 }
1245
1246 LTTNG_HIDDEN
1247 int mi_lttng_event(struct mi_writer *writer,
1248                 struct lttng_event *event, int is_open, enum lttng_domain_type domain)
1249 {
1250         int ret;
1251
1252         ret = mi_lttng_event_common_attributes(writer, event);
1253         if (ret) {
1254                 goto end;
1255         }
1256
1257         switch (event->type) {
1258         case LTTNG_EVENT_TRACEPOINT:
1259         {
1260                 if (event->loglevel != -1) {
1261                         ret = mi_lttng_event_tracepoint_loglevel(writer, event, domain);
1262                 } else {
1263                         ret = mi_lttng_event_tracepoint_no_loglevel(writer, event);
1264                 }
1265                 break;
1266         }
1267         case LTTNG_EVENT_FUNCTION:
1268                 /* Fallthrough */
1269         case LTTNG_EVENT_PROBE:
1270                 ret = mi_lttng_event_function_probe(writer, event);
1271                 break;
1272         case LTTNG_EVENT_FUNCTION_ENTRY:
1273                 ret = mi_lttng_event_function_entry(writer, event);
1274                 break;
1275         case LTTNG_EVENT_ALL:
1276                 /* Fallthrough */
1277         default:
1278                 break;
1279         }
1280
1281         if (!is_open) {
1282                 ret = mi_lttng_writer_close_element(writer);
1283         }
1284
1285 end:
1286         return ret;
1287 }
1288
1289 LTTNG_HIDDEN
1290 int mi_lttng_trackers_open(struct mi_writer *writer)
1291 {
1292         return mi_lttng_writer_open_element(writer, config_element_trackers);
1293 }
1294
1295 LTTNG_HIDDEN
1296 int mi_lttng_pid_tracker_open(struct mi_writer *writer)
1297 {
1298         int ret;
1299
1300         /* Open element pid_tracker */
1301         ret = mi_lttng_writer_open_element(writer, config_element_pid_tracker);
1302         if (ret) {
1303                 goto end;
1304         }
1305
1306         /* Open targets element */
1307         ret = mi_lttng_targets_open(writer);
1308 end:
1309         return ret;
1310 }
1311
1312 LTTNG_HIDDEN
1313 int mi_lttng_pids_open(struct mi_writer *writer)
1314 {
1315         return mi_lttng_writer_open_element(writer, config_element_pids);
1316 }
1317
1318 /*
1319  * TODO: move the listing of pid for user agent to process semantic on
1320  * mi api bump. The use of process element break the mi api.
1321  */
1322 LTTNG_HIDDEN
1323 int mi_lttng_pid(struct mi_writer *writer, pid_t pid , const char *name,
1324                 int is_open)
1325 {
1326         int ret;
1327
1328         /* Open pid process */
1329         ret = mi_lttng_writer_open_element(writer, config_element_pid);
1330         if (ret) {
1331                 goto end;
1332         }
1333
1334         /* Writing pid number */
1335         ret = mi_lttng_writer_write_element_signed_int(writer,
1336                         mi_lttng_element_pid_id, (int)pid);
1337         if (ret) {
1338                 goto end;
1339         }
1340
1341         /* Writing name of the process */
1342         if (name) {
1343                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1344                                 name);
1345                 if (ret) {
1346                         goto end;
1347                 }
1348         }
1349
1350         if (!is_open) {
1351                 /* Closing Pid */
1352                 ret = mi_lttng_writer_close_element(writer);
1353         }
1354
1355 end:
1356         return ret;
1357 }
1358
1359 LTTNG_HIDDEN
1360 int mi_lttng_targets_open(struct mi_writer *writer)
1361 {
1362         return mi_lttng_writer_open_element(writer,
1363                         config_element_targets);
1364 }
1365
1366 LTTNG_HIDDEN
1367 int mi_lttng_pid_target(struct mi_writer *writer, pid_t pid, int is_open)
1368 {
1369         int ret;
1370
1371         ret = mi_lttng_writer_open_element(writer,
1372                         config_element_target_pid);
1373         if (ret) {
1374                 goto end;
1375         }
1376
1377         /* Writing pid number
1378          * Special case for element all on track untrack command
1379          * All pid is represented as wildcard *
1380          */
1381         if ((int) pid == -1) {
1382                 ret = mi_lttng_writer_write_element_string(writer,
1383                                 config_element_pid,
1384                                 mi_lttng_element_track_untrack_all_wildcard);
1385         } else {
1386                 ret = mi_lttng_writer_write_element_signed_int(writer,
1387                                 config_element_pid, (int) pid);
1388         }
1389         if (ret) {
1390                 goto end;
1391         }
1392
1393         if (!is_open) {
1394                 ret = mi_lttng_writer_close_element(writer);
1395                 if (ret) {
1396                         goto end;
1397                 }
1398         }
1399
1400 end:
1401         return ret;
1402 }
1403
1404 LTTNG_HIDDEN
1405 int mi_lttng_event_fields_open(struct mi_writer *writer)
1406 {
1407         return mi_lttng_writer_open_element(writer, mi_lttng_element_event_fields);
1408 }
1409
1410 LTTNG_HIDDEN
1411 int mi_lttng_event_field(struct mi_writer *writer,
1412                 struct lttng_event_field *field)
1413 {
1414         int ret;
1415
1416         if (!field->field_name[0]) {
1417                 ret = 0;
1418                 goto end;
1419         }
1420
1421         /* Open field */
1422         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_event_field);
1423         if (ret) {
1424                 goto end;
1425         }
1426
1427         if (!field->field_name[0]) {
1428                 goto close;
1429         }
1430
1431         /* Name */
1432         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1433                         field->field_name);
1434         if (ret) {
1435                 goto end;
1436         }
1437
1438         /* Type */
1439         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1440                         mi_lttng_eventfieldtype_string(field->type));
1441         if (ret) {
1442                 goto end;
1443         }
1444
1445         /* nowrite  */
1446         ret = mi_lttng_writer_write_element_signed_int(writer,
1447                         mi_lttng_element_nowrite, field->nowrite);
1448         if (ret) {
1449                 goto end;
1450         }
1451
1452 close:
1453         /* Close field element */
1454         ret = mi_lttng_writer_close_element(writer);
1455
1456 end:
1457         return ret;
1458 }
1459
1460 LTTNG_HIDDEN
1461 int mi_lttng_perf_counter_context(struct mi_writer *writer,
1462                 struct lttng_event_perf_counter_ctx  *perf_context)
1463 {
1464         int ret;
1465
1466         /* Open perf_counter_context */
1467         ret = mi_lttng_writer_open_element(writer,
1468                         mi_lttng_element_perf_counter_context);
1469         if (ret) {
1470                 goto end;
1471         }
1472
1473         /* Type */
1474         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1475                         config_element_type, perf_context->type);
1476         if (ret) {
1477                 goto end;
1478         }
1479
1480         /* Config */
1481         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1482                         config_element_config, perf_context->config);
1483         if (ret) {
1484                 goto end;
1485         }
1486
1487         /* Name of the perf counter */
1488         ret = mi_lttng_writer_write_element_string(writer,
1489                         config_element_name, perf_context->name);
1490         if (ret) {
1491                 goto end;
1492         }
1493
1494         /* Close perf_counter_context */
1495         ret = mi_lttng_writer_close_element(writer);
1496 end:
1497         return ret;
1498 }
1499
1500 static
1501 int mi_lttng_app_context(struct mi_writer *writer,
1502                 const char *provider_name, const char *ctx_name)
1503 {
1504         int ret;
1505
1506         /* Open app */
1507         ret = mi_lttng_writer_open_element(writer,
1508                         config_element_context_app);
1509         if (ret) {
1510                 goto end;
1511         }
1512
1513         /* provider_name */
1514         ret = mi_lttng_writer_write_element_string(writer,
1515                         config_element_context_app_provider_name,
1516                         provider_name);
1517         if (ret) {
1518                 goto end;
1519         }
1520
1521         /* ctx_name */
1522         ret = mi_lttng_writer_write_element_string(writer,
1523                         config_element_context_app_ctx_name, ctx_name);
1524         if (ret) {
1525                 goto end;
1526         }
1527
1528         /* Close app */
1529         ret = mi_lttng_writer_close_element(writer);
1530 end:
1531         return ret;
1532 }
1533
1534 LTTNG_HIDDEN
1535 int mi_lttng_context(struct mi_writer *writer,
1536                 struct lttng_event_context *context, int is_open)
1537 {
1538         int ret;
1539
1540         /* Open context */
1541         ret = mi_lttng_writer_open_element(writer , config_element_context);
1542         if (ret) {
1543                 goto end;
1544         }
1545
1546         /* Special case for PERF_*_COUNTER
1547          * print the lttng_event_perf_counter_ctx*/
1548         switch (context->ctx) {
1549         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
1550         case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
1551         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
1552         {
1553                 struct lttng_event_perf_counter_ctx *perf_context =
1554                                 &context->u.perf_counter;
1555                 ret =  mi_lttng_perf_counter_context(writer, perf_context);
1556                 if (ret) {
1557                         goto end;
1558                 }
1559                 break;
1560         }
1561         case LTTNG_EVENT_CONTEXT_APP_CONTEXT:
1562         {
1563                 ret = mi_lttng_app_context(writer,
1564                                 context->u.app_ctx.provider_name,
1565                                 context->u.app_ctx.ctx_name);
1566                 if (ret) {
1567                         goto end;
1568                 }
1569                 break;
1570         }
1571         default:
1572         {
1573                 const char *type_string = mi_lttng_event_contexttype_string(
1574                                 context->ctx);
1575                 if (!type_string) {
1576                         ret = -LTTNG_ERR_INVALID;
1577                         goto end;
1578                 }
1579
1580                 /* Print context type */
1581                 ret = mi_lttng_writer_write_element_string(writer,
1582                                 config_element_type, type_string);
1583                 break;
1584         }
1585         }
1586
1587         /* Close context */
1588         if (!is_open) {
1589                 ret = mi_lttng_writer_close_element(writer);
1590         }
1591
1592 end:
1593         return ret;
1594 }
1595
1596 LTTNG_HIDDEN
1597 int mi_lttng_snapshot_output_session_name(struct mi_writer *writer,
1598                 const char *session_name)
1599 {
1600         int ret;
1601
1602         /* Open session element */
1603         ret = mi_lttng_writer_open_element(writer, config_element_session);
1604         if (ret) {
1605                 goto end;
1606         }
1607
1608         /* Snapshot output list for current session name */
1609         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1610                         session_name);
1611         if (ret) {
1612                 goto end;
1613         }
1614
1615         /* Open element snapshots (sequence one snapshot) */
1616         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_snapshots);
1617         if (ret) {
1618                 goto end;
1619         }
1620
1621 end:
1622         return ret;
1623 }
1624
1625 LTTNG_HIDDEN
1626 int mi_lttng_snapshot_list_output(struct mi_writer *writer,
1627                 struct lttng_snapshot_output *output)
1628 {
1629         int ret;
1630
1631         /* Open element snapshot output */
1632         ret = mi_lttng_writer_open_element(writer,
1633                         mi_lttng_element_command_snapshot);
1634         if (ret) {
1635                 goto end;
1636         }
1637
1638         /* ID of the snapshot output */
1639         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1640                         mi_lttng_element_id, output->id);
1641         if (ret) {
1642                 goto end;
1643         }
1644
1645         /* Name of the output */
1646         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1647                         output->name);
1648         if (ret) {
1649                 goto end;
1650         }
1651
1652         /* Destination of the output (ctrl_url)*/
1653         ret = mi_lttng_writer_write_element_string(writer,
1654                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1655         if (ret) {
1656                 goto end;
1657         }
1658
1659         /* Destination of the output (data_url) */
1660         ret = mi_lttng_writer_write_element_string(writer,
1661                         mi_lttng_element_snapshot_data_url, output->data_url);
1662         if (ret) {
1663                 goto end;
1664         }
1665
1666         /* total size of all stream combined */
1667         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1668                         mi_lttng_element_snapshot_max_size, output->max_size);
1669         if (ret) {
1670                 goto end;
1671         }
1672
1673         /* Close snapshot output element */
1674         ret = mi_lttng_writer_close_element(writer);
1675
1676 end:
1677         return ret;
1678 }
1679
1680 LTTNG_HIDDEN
1681 int mi_lttng_snapshot_del_output(struct mi_writer *writer, int id,
1682                 const char *name, const char *current_session_name)
1683 {
1684         int ret;
1685
1686         /* Open element del_snapshot */
1687         ret = mi_lttng_writer_open_element(writer,
1688                         mi_lttng_element_command_snapshot);
1689         if (ret) {
1690                 goto end;
1691         }
1692
1693
1694         if (id != UINT32_MAX) {
1695                 /* "Snapshot output "id" successfully deleted
1696                  * for "current_session_name"
1697                  * ID of the snapshot output
1698                  */
1699                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1700                                 mi_lttng_element_id, id);
1701                 if (ret) {
1702                         goto end;
1703                 }
1704         } else {
1705                 /* "Snapshot output "name" successfully deleted
1706                  * for session "current_session_name"
1707                  * Name of the output
1708                  */
1709                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1710                                 name);
1711                 if (ret) {
1712                         goto end;
1713                 }
1714         }
1715
1716         /* Snapshot was deleted for session "current_session_name"*/
1717         ret = mi_lttng_writer_write_element_string(writer,
1718                         mi_lttng_element_snapshot_session_name,
1719                         current_session_name);
1720         if (ret) {
1721                 goto end;
1722         }
1723
1724         /* Close snapshot element */
1725         ret = mi_lttng_writer_close_element(writer);
1726
1727 end:
1728         return ret;
1729 }
1730
1731 LTTNG_HIDDEN
1732 int mi_lttng_snapshot_add_output(struct mi_writer *writer,
1733                 const char *current_session_name, const char *n_ptr,
1734                 struct lttng_snapshot_output *output)
1735 {
1736         int ret;
1737
1738         /* Open element snapshot */
1739         ret = mi_lttng_writer_open_element(writer,
1740                         mi_lttng_element_command_snapshot);
1741         if (ret) {
1742                 goto end;
1743         }
1744
1745         /* Snapshot output id */
1746         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1747                         mi_lttng_element_id, output->id);
1748         if (ret) {
1749                 goto end;
1750         }
1751
1752         /* Snapshot output names */
1753         ret = mi_lttng_writer_write_element_string(writer,
1754                         config_element_name, n_ptr);
1755         if (ret) {
1756                 goto end;
1757         }
1758
1759         /* Destination of the output (ctrl_url)*/
1760         ret = mi_lttng_writer_write_element_string(writer,
1761                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1762         if (ret) {
1763                 goto end;
1764         }
1765
1766         /* Snapshot added for session "current_session_name"*/
1767         ret = mi_lttng_writer_write_element_string(writer,
1768                         mi_lttng_element_snapshot_session_name, current_session_name);
1769         if (ret) {
1770                 goto end;
1771         }
1772
1773         /* total size of all stream combined */
1774         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1775                         mi_lttng_element_snapshot_max_size, output->max_size);
1776         if (ret) {
1777                 goto end;
1778         }
1779
1780         /* Close snapshot element */
1781         ret = mi_lttng_writer_close_element(writer);
1782
1783 end:
1784         return ret;
1785 }
1786
1787 LTTNG_HIDDEN
1788 int mi_lttng_snapshot_record(struct mi_writer *writer,
1789                 const char *current_session_name, const char *url,
1790                 const char *cmdline_ctrl_url, const char *cmdline_data_url)
1791 {
1792         int ret;
1793
1794         /* Open element snapshot */
1795         ret = mi_lttng_writer_open_element(writer,
1796                         mi_lttng_element_command_snapshot);
1797         if (ret) {
1798                 goto end;
1799         }
1800
1801         /*
1802          * If a valid an URL was given, serialize it,
1803          * else take the command line data and ctrl urls*/
1804         if (url) {
1805                 /* Destination of the output (ctrl_url)*/
1806                 ret = mi_lttng_writer_write_element_string(writer,
1807                                 mi_lttng_element_snapshot_ctrl_url, url);
1808                 if (ret) {
1809                         goto end;
1810                 }
1811         } else if (cmdline_ctrl_url) {
1812                 /* Destination of the output (ctrl_url)*/
1813                 ret = mi_lttng_writer_write_element_string(writer,
1814                                 mi_lttng_element_snapshot_ctrl_url, cmdline_ctrl_url);
1815                 if (ret) {
1816                         goto end;
1817                 }
1818
1819                 /* Destination of the output (data_url) */
1820                 ret = mi_lttng_writer_write_element_string(writer,
1821                                 mi_lttng_element_snapshot_data_url, cmdline_data_url);
1822                 if (ret) {
1823                         goto end;
1824                 }
1825         }
1826
1827         /* Close record_snapshot element */
1828         ret = mi_lttng_writer_close_element(writer);
1829
1830 end:
1831         return ret;
1832 }