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         "https://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 /* String related to add-context command */
 194 LTTNG_HIDDEN const char * const mi_lttng_element_context_symbol = "symbol";
 195
 196 /* Deprecated symbols preserved for ABI compatibility. */
 197 const char * const mi_lttng_context_type_perf_counter;
 198 const char * const mi_lttng_context_type_perf_cpu_counter;
 199 const char * const mi_lttng_context_type_perf_thread_counter;
 200 const char * const mi_lttng_element_track_untrack_pid_target;
 201 const char * const mi_lttng_element_track_untrack_targets;
 202 const char * const mi_lttng_element_calibrate;
 203 const char * const mi_lttng_element_calibrate_function;
 204 const char * const mi_lttng_element_command_calibrate;
 205
 206 /* This is a merge of jul loglevel and regular loglevel
 207  * Those should never overlap by definition
 208  * (see struct lttng_event loglevel)
 209  */
 210 LTTNG_HIDDEN
 211 const char *mi_lttng_loglevel_string(int value, enum lttng_domain_type domain)
 212 {
 213         switch (domain) {
 214         case LTTNG_DOMAIN_KERNEL:
 215         case LTTNG_DOMAIN_UST:
 216                 switch (value) {
 217                 case -1:
 218                         return mi_lttng_element_empty;
 219                 case LTTNG_LOGLEVEL_EMERG:
 220                         return mi_lttng_loglevel_str_emerg;
 221                 case LTTNG_LOGLEVEL_ALERT:
 222                         return mi_lttng_loglevel_str_alert;
 223                 case LTTNG_LOGLEVEL_CRIT:
 224                         return mi_lttng_loglevel_str_crit;
 225                 case LTTNG_LOGLEVEL_ERR:
 226                         return mi_lttng_loglevel_str_err;
 227                 case LTTNG_LOGLEVEL_WARNING:
 228                         return mi_lttng_loglevel_str_warning;
 229                 case LTTNG_LOGLEVEL_NOTICE:
 230                         return mi_lttng_loglevel_str_notice;
 231                 case LTTNG_LOGLEVEL_INFO:
 232                         return mi_lttng_loglevel_str_info;
 233                 case LTTNG_LOGLEVEL_DEBUG_SYSTEM:
 234                         return mi_lttng_loglevel_str_debug_system;
 235                 case LTTNG_LOGLEVEL_DEBUG_PROGRAM:
 236                         return mi_lttng_loglevel_str_debug_program;
 237                 case LTTNG_LOGLEVEL_DEBUG_PROCESS:
 238                         return mi_lttng_loglevel_str_debug_process;
 239                 case LTTNG_LOGLEVEL_DEBUG_MODULE:
 240                         return mi_lttng_loglevel_str_debug_module;
 241                 case LTTNG_LOGLEVEL_DEBUG_UNIT:
 242                         return mi_lttng_loglevel_str_debug_unit;
 243                 case LTTNG_LOGLEVEL_DEBUG_FUNCTION:
 244                         return mi_lttng_loglevel_str_debug_function;
 245                 case LTTNG_LOGLEVEL_DEBUG_LINE:
 246                         return mi_lttng_loglevel_str_debug_line;
 247                 case LTTNG_LOGLEVEL_DEBUG:
 248                         return mi_lttng_loglevel_str_debug;
 249                 default:
 250                         return mi_lttng_loglevel_str_unknown;
 251                 }
 252                 break;
 253         case LTTNG_DOMAIN_LOG4J:
 254                 switch (value) {
 255                 case -1:
 256                         return mi_lttng_element_empty;
 257                 case LTTNG_LOGLEVEL_LOG4J_OFF:
 258                         return mi_lttng_loglevel_str_log4j_off;
 259                 case LTTNG_LOGLEVEL_LOG4J_FATAL:
 260                         return mi_lttng_loglevel_str_log4j_fatal;
 261                 case LTTNG_LOGLEVEL_LOG4J_ERROR:
 262                         return mi_lttng_loglevel_str_log4j_error;
 263                 case LTTNG_LOGLEVEL_LOG4J_WARN:
 264                         return mi_lttng_loglevel_str_log4j_warn;
 265                 case LTTNG_LOGLEVEL_LOG4J_INFO:
 266                         return mi_lttng_loglevel_str_log4j_info;
 267                 case LTTNG_LOGLEVEL_LOG4J_DEBUG:
 268                         return mi_lttng_loglevel_str_log4j_debug;
 269                 case LTTNG_LOGLEVEL_LOG4J_TRACE:
 270                         return mi_lttng_loglevel_str_log4j_trace;
 271                 case LTTNG_LOGLEVEL_LOG4J_ALL:
 272                         return mi_lttng_loglevel_str_log4j_all;
 273                 default:
 274                         return mi_lttng_loglevel_str_unknown;
 275                 }
 276                 break;
 277         case LTTNG_DOMAIN_JUL:
 278                 switch (value) {
 279                 case -1:
 280                         return mi_lttng_element_empty;
 281                 case LTTNG_LOGLEVEL_JUL_OFF:
 282                         return mi_lttng_loglevel_str_jul_off;
 283                 case LTTNG_LOGLEVEL_JUL_SEVERE:
 284                         return mi_lttng_loglevel_str_jul_severe;
 285                 case LTTNG_LOGLEVEL_JUL_WARNING:
 286                         return mi_lttng_loglevel_str_jul_warning;
 287                 case LTTNG_LOGLEVEL_JUL_INFO:
 288                         return mi_lttng_loglevel_str_jul_info;
 289                 case LTTNG_LOGLEVEL_JUL_CONFIG:
 290                         return mi_lttng_loglevel_str_jul_config;
 291                 case LTTNG_LOGLEVEL_JUL_FINE:
 292                         return mi_lttng_loglevel_str_jul_fine;
 293                 case LTTNG_LOGLEVEL_JUL_FINER:
 294                         return mi_lttng_loglevel_str_jul_finer;
 295                 case LTTNG_LOGLEVEL_JUL_FINEST:
 296                         return mi_lttng_loglevel_str_jul_finest;
 297                 case LTTNG_LOGLEVEL_JUL_ALL:
 298                         return mi_lttng_loglevel_str_jul_all;
 299                 default:
 300                         return mi_lttng_loglevel_str_unknown;
 301                 }
 302                 break;
 303         case LTTNG_DOMAIN_PYTHON:
 304                 switch (value) {
 305                 case LTTNG_LOGLEVEL_PYTHON_CRITICAL:
 306                         return mi_lttng_loglevel_str_python_critical;
 307                 case LTTNG_LOGLEVEL_PYTHON_ERROR:
 308                         return mi_lttng_loglevel_str_python_error;
 309                 case LTTNG_LOGLEVEL_PYTHON_WARNING:
 310                         return mi_lttng_loglevel_str_python_warning;
 311                 case LTTNG_LOGLEVEL_PYTHON_INFO:
 312                         return mi_lttng_loglevel_str_python_info;
 313                 case LTTNG_LOGLEVEL_PYTHON_DEBUG:
 314                         return mi_lttng_loglevel_str_python_debug;
 315                 case LTTNG_LOGLEVEL_PYTHON_NOTSET:
 316                         return mi_lttng_loglevel_str_python_notset;
 317                 default:
 318                         return mi_lttng_loglevel_str_unknown;
 319                 }
 320                 break;
 321         default:
 322                 return mi_lttng_loglevel_str_unknown;
 323         }
 324 }
 325
 326 LTTNG_HIDDEN
 327 const char *mi_lttng_logleveltype_string(enum lttng_loglevel_type value)
 328 {
 329         switch (value) {
 330         case LTTNG_EVENT_LOGLEVEL_ALL:
 331                 return mi_lttng_loglevel_type_all;
 332         case LTTNG_EVENT_LOGLEVEL_RANGE:
 333                 return mi_lttng_loglevel_type_range;
 334         case LTTNG_EVENT_LOGLEVEL_SINGLE:
 335                 return mi_lttng_loglevel_type_single;
 336         default:
 337                 return mi_lttng_loglevel_type_unknown;
 338         }
 339 }
 340
 341 LTTNG_HIDDEN
 342 const char *mi_lttng_eventtype_string(enum lttng_event_type value)
 343 {
 344         switch (value) {
 345         case LTTNG_EVENT_ALL:
 346                 return config_event_type_all;
 347         case LTTNG_EVENT_TRACEPOINT:
 348                 return config_event_type_tracepoint;
 349         case LTTNG_EVENT_PROBE:
 350                 return config_event_type_probe;
 351         case LTTNG_EVENT_FUNCTION:
 352                 return config_event_type_function;
 353         case LTTNG_EVENT_FUNCTION_ENTRY:
 354                 return config_event_type_function_entry;
 355         case LTTNG_EVENT_SYSCALL:
 356                 return config_event_type_syscall;
 357         case LTTNG_EVENT_NOOP:
 358                 return config_event_type_noop;
 359         default:
 360                 return mi_lttng_element_empty;
 361         }
 362 }
 363
 364 static
 365 const char *mi_lttng_event_contexttype_string(enum lttng_event_context_type val)
 366 {
 367         switch (val) {
 368         case LTTNG_EVENT_CONTEXT_PID:
 369                 return config_event_context_pid;
 370         case LTTNG_EVENT_CONTEXT_PROCNAME:
 371                 return config_event_context_procname;
 372         case LTTNG_EVENT_CONTEXT_PRIO:
 373                 return config_event_context_prio;
 374         case LTTNG_EVENT_CONTEXT_NICE:
 375                 return config_event_context_nice;
 376         case LTTNG_EVENT_CONTEXT_VPID:
 377                 return config_event_context_vpid;
 378         case LTTNG_EVENT_CONTEXT_TID:
 379                 return config_event_context_tid;
 380         case LTTNG_EVENT_CONTEXT_VTID:
 381                 return config_event_context_vtid;
 382         case LTTNG_EVENT_CONTEXT_PPID:
 383                 return config_event_context_ppid;
 384         case LTTNG_EVENT_CONTEXT_VPPID:
 385                 return config_event_context_vppid;
 386         case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
 387                 return config_event_context_pthread_id;
 388         case LTTNG_EVENT_CONTEXT_HOSTNAME:
 389                 return config_event_context_hostname;
 390         case LTTNG_EVENT_CONTEXT_IP:
 391                 return config_event_context_ip;
 392         case LTTNG_EVENT_CONTEXT_INTERRUPTIBLE:
 393                 return config_event_context_interruptible;
 394         case LTTNG_EVENT_CONTEXT_PREEMPTIBLE:
 395                 return config_event_context_preemptible;
 396         case LTTNG_EVENT_CONTEXT_NEED_RESCHEDULE:
 397                 return config_event_context_need_reschedule;
 398         case LTTNG_EVENT_CONTEXT_MIGRATABLE:
 399                 return config_event_context_migratable;
 400         case LTTNG_EVENT_CONTEXT_CALLSTACK_USER:
 401                 return config_event_context_callstack_user;
 402         case LTTNG_EVENT_CONTEXT_CALLSTACK_KERNEL:
 403                 return config_event_context_callstack_kernel;
 404         default:
 405                 return NULL;
 406         }
 407 }
 408
 409 LTTNG_HIDDEN
 410 const char *mi_lttng_eventfieldtype_string(enum lttng_event_field_type val)
 411 {
 412         switch (val) {
 413         case(LTTNG_EVENT_FIELD_INTEGER):
 414                 return mi_lttng_element_type_integer;
 415         case(LTTNG_EVENT_FIELD_ENUM):
 416                 return mi_lttng_element_type_enum;
 417         case(LTTNG_EVENT_FIELD_FLOAT):
 418                 return mi_lttng_element_type_float;
 419         case(LTTNG_EVENT_FIELD_STRING):
 420                 return mi_lttng_element_type_string;
 421         default:
 422                 return mi_lttng_element_type_other;
 423         }
 424 }
 425
 426 LTTNG_HIDDEN
 427 const char *mi_lttng_domaintype_string(enum lttng_domain_type value)
 428 {
 429         /* Note: This is a *duplicate* of get_domain_str from bin/lttng/utils.c */
 430         switch (value) {
 431         case LTTNG_DOMAIN_KERNEL:
 432                 return config_domain_type_kernel;
 433         case LTTNG_DOMAIN_UST:
 434                 return config_domain_type_ust;
 435         case LTTNG_DOMAIN_JUL:
 436                 return config_domain_type_jul;
 437         case LTTNG_DOMAIN_LOG4J:
 438                 return config_domain_type_log4j;
 439         case LTTNG_DOMAIN_PYTHON:
 440                 return config_domain_type_python;
 441         default:
 442                 /* Should not have an unknown domain */
 443                 assert(0);
 444                 return NULL;
 445         }
 446 }
 447
 448 LTTNG_HIDDEN
 449 const char *mi_lttng_buffertype_string(enum lttng_buffer_type value)
 450 {
 451         switch (value) {
 452         case LTTNG_BUFFER_PER_PID:
 453                 return config_buffer_type_per_pid;
 454         case LTTNG_BUFFER_PER_UID:
 455                 return config_buffer_type_per_uid;
 456         case LTTNG_BUFFER_GLOBAL:
 457                 return config_buffer_type_global;
 458         default:
 459                 /* Should not have an unknow buffer type */
 460                 assert(0);
 461                 return NULL;
 462         }
 463 }
 464
 465 LTTNG_HIDDEN
 466 struct mi_writer *mi_lttng_writer_create(int fd_output, int mi_output_type)
 467 {
 468         struct mi_writer *mi_writer;
 469
 470         mi_writer = zmalloc(sizeof(struct mi_writer));
 471         if (!mi_writer) {
 472                 PERROR("zmalloc mi_writer_create");
 473                 goto end;
 474         }
 475         if (mi_output_type == LTTNG_MI_XML) {
 476                 mi_writer->writer = config_writer_create(fd_output, 0);
 477                 if (!mi_writer->writer) {
 478                         goto err_destroy;
 479                 }
 480                 mi_writer->type = LTTNG_MI_XML;
 481         } else {
 482                 goto err_destroy;
 483         }
 484
 485 end:
 486         return mi_writer;
 487
 488 err_destroy:
 489         free(mi_writer);
 490         return NULL;
 491 }
 492
 493 LTTNG_HIDDEN
 494 int mi_lttng_writer_destroy(struct mi_writer *writer)
 495 {
 496         int ret;
 497
 498         if (!writer) {
 499                 ret = -EINVAL;
 500                 goto end;
 501         }
 502
 503         ret = config_writer_destroy(writer->writer);
 504         if (ret < 0) {
 505                 goto end;
 506         }
 507
 508         free(writer);
 509 end:
 510         return ret;
 511 }
 512
 513 LTTNG_HIDDEN
 514 int mi_lttng_writer_command_open(struct mi_writer *writer, const char *command)
 515 {
 516         int ret;
 517
 518         /*
 519          * A command is always the MI's root node, it must declare the current
 520          * namespace and schema URIs and the schema's version.
 521          */
 522         ret = config_writer_open_element(writer->writer,
 523                         mi_lttng_element_command);
 524         if (ret) {
 525                 goto end;
 526         }
 527
 528         ret = config_writer_write_attribute(writer->writer,
 529                         mi_lttng_xmlns, DEFAULT_LTTNG_MI_NAMESPACE);
 530         if (ret) {
 531                 goto end;
 532         }
 533
 534         ret = config_writer_write_attribute(writer->writer,
 535                         mi_lttng_xmlns_xsi, mi_lttng_w3_schema_uri);
 536         if (ret) {
 537                 goto end;
 538         }
 539
 540         ret = config_writer_write_attribute(writer->writer,
 541                         mi_lttng_schema_location,
 542                         mi_lttng_schema_location_uri);
 543         if (ret) {
 544                 goto end;
 545         }
 546
 547         ret = config_writer_write_attribute(writer->writer,
 548                         mi_lttng_schema_version,
 549                         mi_lttng_schema_version_value);
 550         if (ret) {
 551                 goto end;
 552         }
 553
 554         ret = mi_lttng_writer_write_element_string(writer,
 555                         mi_lttng_element_command_name, command);
 556 end:
 557         return ret;
 558 }
 559
 560 LTTNG_HIDDEN
 561 int mi_lttng_writer_command_close(struct mi_writer *writer)
 562 {
 563         return mi_lttng_writer_close_element(writer);
 564 }
 565
 566 LTTNG_HIDDEN
 567 int mi_lttng_writer_open_element(struct mi_writer *writer,
 568                 const char *element_name)
 569 {
 570         return config_writer_open_element(writer->writer, element_name);
 571 }
 572
 573 LTTNG_HIDDEN
 574 int mi_lttng_writer_close_element(struct mi_writer *writer)
 575 {
 576         return config_writer_close_element(writer->writer);
 577 }
 578
 579 LTTNG_HIDDEN
 580 int mi_lttng_close_multi_element(struct mi_writer *writer,
 581                 unsigned int nb_element)
 582 {
 583         int ret, i;
 584
 585         if (nb_element < 1) {
 586                 ret = 0;
 587                 goto end;
 588         }
 589         for (i = 0; i < nb_element; i++) {
 590                 ret = mi_lttng_writer_close_element(writer);
 591                 if (ret) {
 592                         goto end;
 593                 }
 594         }
 595 end:
 596         return ret;
 597 }
 598
 599 LTTNG_HIDDEN
 600 int mi_lttng_writer_write_element_unsigned_int(struct mi_writer *writer,
 601                 const char *element_name, uint64_t value)
 602 {
 603         return config_writer_write_element_unsigned_int(writer->writer,
 604                         element_name, value);
 605 }
 606
 607 LTTNG_HIDDEN
 608 int mi_lttng_writer_write_element_signed_int(struct mi_writer *writer,
 609                 const char *element_name, int64_t value)
 610 {
 611         return config_writer_write_element_signed_int(writer->writer,
 612                         element_name, value);
 613 }
 614
 615 LTTNG_HIDDEN
 616 int mi_lttng_writer_write_element_bool(struct mi_writer *writer,
 617                 const char *element_name, int value)
 618 {
 619         return config_writer_write_element_bool(writer->writer,
 620                         element_name, value);
 621 }
 622
 623 LTTNG_HIDDEN
 624 int mi_lttng_writer_write_element_string(struct mi_writer *writer,
 625                 const char *element_name, const char *value)
 626 {
 627         return config_writer_write_element_string(writer->writer,
 628                         element_name, value);
 629 }
 630
 631 LTTNG_HIDDEN
 632 int mi_lttng_version(struct mi_writer *writer, struct mi_lttng_version *version,
 633         const char *lttng_description, const char *lttng_license)
 634 {
 635         int ret;
 636
 637         /* Open version */
 638         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_version);
 639         if (ret) {
 640                 goto end;
 641         }
 642
 643         /* Version string (contain info like rc etc.) */
 644         ret = mi_lttng_writer_write_element_string(writer,
 645                         mi_lttng_element_version_str, version->version);
 646         if (ret) {
 647                 goto end;
 648         }
 649
 650         /* Major version number */
 651         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 652                         mi_lttng_element_version_major, version->version_major);
 653         if (ret) {
 654                 goto end;
 655         }
 656
 657         /* Minor version number */
 658         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 659                         mi_lttng_element_version_minor, version->version_minor);
 660         if (ret) {
 661                 goto end;
 662         }
 663
 664         /* Commit version number */
 665         ret = mi_lttng_writer_write_element_string(writer,
 666                         mi_lttng_element_version_commit, version->version_commit);
 667         if (ret) {
 668                 goto end;
 669         }
 670
 671         /* Patch number */
 672         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 673                         mi_lttng_element_version_patch_level, version->version_patchlevel);
 674         if (ret) {
 675                 goto end;
 676         }
 677
 678         /* Name of the version */
 679         ret = mi_lttng_writer_write_element_string(writer,
 680                         config_element_name, version->version_name);
 681         if (ret) {
 682                 goto end;
 683         }
 684
 685         /* Description mostly related to beer... */
 686         ret = mi_lttng_writer_write_element_string(writer,
 687                         mi_lttng_element_version_description, lttng_description);
 688         if (ret) {
 689                 goto end;
 690         }
 691
 692         /* url */
 693         ret = mi_lttng_writer_write_element_string(writer,
 694                         mi_lttng_element_version_web, version->package_url);
 695         if (ret) {
 696                 goto end;
 697         }
 698
 699         /* License: free as in free beer...no...*speech* */
 700         ret = mi_lttng_writer_write_element_string(writer,
 701                         mi_lttng_element_version_license, lttng_license);
 702         if (ret) {
 703                 goto end;
 704         }
 705
 706         /* Close version element */
 707         ret = mi_lttng_writer_close_element(writer);
 708
 709 end:
 710         return ret;
 711 }
 712
 713 LTTNG_HIDDEN
 714 int mi_lttng_sessions_open(struct mi_writer *writer)
 715 {
 716         return mi_lttng_writer_open_element(writer, config_element_sessions);
 717 }
 718
 719 LTTNG_HIDDEN
 720 int mi_lttng_session(struct mi_writer *writer,
 721                 struct lttng_session *session, int is_open)
 722 {
 723         int ret;
 724
 725         assert(session);
 726
 727         /* Open sessions element */
 728         ret = mi_lttng_writer_open_element(writer,
 729                         config_element_session);
 730         if (ret) {
 731                 goto end;
 732         }
 733
 734         /* Name of the session */
 735         ret = mi_lttng_writer_write_element_string(writer,
 736                         config_element_name, session->name);
 737         if (ret) {
 738                 goto end;
 739         }
 740
 741         /* Path */
 742         ret = mi_lttng_writer_write_element_string(writer,
 743                         config_element_path, session->path);
 744         if (ret) {
 745                 goto end;
 746         }
 747
 748         /* Enabled ? */
 749         ret = mi_lttng_writer_write_element_bool(writer,
 750                         config_element_enabled, session->enabled);
 751         if (ret) {
 752                 goto end;
 753         }
 754
 755         /* Snapshot mode */
 756         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 757                         config_element_snapshot_mode, session->snapshot_mode);
 758         if (ret) {
 759                 goto end;
 760         }
 761
 762         /* Live timer interval in usec */
 763         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 764                         config_element_live_timer_interval,
 765                         session->live_timer_interval);
 766         if (ret) {
 767                 goto end;
 768         }
 769
 770         if (!is_open) {
 771                 /* Closing session element */
 772                 ret = mi_lttng_writer_close_element(writer);
 773         }
 774 end:
 775         return ret;
 776
 777 }
 778
 779 LTTNG_HIDDEN
 780 int mi_lttng_domains_open(struct mi_writer *writer)
 781 {
 782         return mi_lttng_writer_open_element(writer, config_element_domains);
 783 }
 784
 785 LTTNG_HIDDEN
 786 int mi_lttng_domain(struct mi_writer *writer,
 787                 struct lttng_domain *domain, int is_open)
 788 {
 789         int ret = 0;
 790         const char *str_domain;
 791         const char *str_buffer;
 792
 793         assert(domain);
 794
 795         /* Open domain element */
 796         ret = mi_lttng_writer_open_element(writer, config_element_domain);
 797         if (ret) {
 798                 goto end;
 799         }
 800
 801         /* Domain Type */
 802         str_domain = mi_lttng_domaintype_string(domain->type);
 803         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
 804                         str_domain);
 805         if (ret) {
 806                 goto end;
 807         }
 808
 809         /* Buffer Type */
 810         str_buffer= mi_lttng_buffertype_string(domain->buf_type);
 811         ret = mi_lttng_writer_write_element_string(writer,
 812                         config_element_buffer_type, str_buffer);
 813         if (ret) {
 814                 goto end;
 815         }
 816
 817         /* TODO: union  attr
 818          * This union is not currently used and was added for
 819          * future ust domain support.
 820          * Date: 25-06-2014
 821          * */
 822
 823         if (!is_open) {
 824                 /* Closing domain element */
 825                 ret = mi_lttng_writer_close_element(writer);
 826         }
 827
 828 end:
 829         return ret;
 830
 831 }
 832
 833 LTTNG_HIDDEN
 834 int mi_lttng_channels_open(struct mi_writer *writer)
 835 {
 836         return mi_lttng_writer_open_element(writer, config_element_channels);
 837 }
 838
 839 LTTNG_HIDDEN
 840 int mi_lttng_channel(struct mi_writer *writer,
 841                 struct lttng_channel *channel, int is_open)
 842 {
 843         int ret = 0;
 844
 845         assert(channel);
 846
 847         /* Opening channel element */
 848         ret = mi_lttng_writer_open_element(writer, config_element_channel);
 849         if (ret) {
 850                 goto end;
 851         }
 852
 853         /* Name */
 854         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
 855                         channel->name);
 856         if (ret) {
 857                 goto end;
 858         }
 859
 860         /* Enabled ? */
 861         ret = mi_lttng_writer_write_element_bool(writer,
 862                         config_element_enabled, channel->enabled);
 863         if (ret) {
 864                 goto end;
 865         }
 866
 867         /* Attribute */
 868         ret = mi_lttng_channel_attr(writer, &channel->attr);
 869         if (ret) {
 870                 goto end;
 871         }
 872
 873         if (!is_open) {
 874                 /* Closing channel element */
 875                 ret = mi_lttng_writer_close_element(writer);
 876                 if (ret) {
 877                         goto end;
 878                 }
 879         }
 880 end:
 881         return ret;
 882 }
 883
 884 LTTNG_HIDDEN
 885 int mi_lttng_channel_attr(struct mi_writer *writer,
 886                 struct lttng_channel_attr *attr)
 887 {
 888         int ret = 0;
 889         struct lttng_channel *chan = caa_container_of(attr,
 890                         struct lttng_channel, attr);
 891         uint64_t discarded_events, lost_packets, monitor_timer_interval;
 892         int64_t blocking_timeout;
 893
 894         assert(attr);
 895
 896         ret = lttng_channel_get_discarded_event_count(chan, &discarded_events);
 897         if (ret) {
 898                 goto end;
 899         }
 900
 901         ret = lttng_channel_get_lost_packet_count(chan, &lost_packets);
 902         if (ret) {
 903                 goto end;
 904         }
 905
 906         ret = lttng_channel_get_monitor_timer_interval(chan,
 907                         &monitor_timer_interval);
 908         if (ret) {
 909                 goto end;
 910         }
 911
 912         ret = lttng_channel_get_blocking_timeout(chan,
 913                         &blocking_timeout);
 914         if (ret) {
 915                 goto end;
 916         }
 917
 918         /* Opening Attributes */
 919         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
 920         if (ret) {
 921                 goto end;
 922         }
 923
 924         /* Overwrite */
 925         ret = mi_lttng_writer_write_element_string(writer,
 926                 config_element_overwrite_mode,
 927                 attr->overwrite ? config_overwrite_mode_overwrite :
 928                         config_overwrite_mode_discard);
 929         if (ret) {
 930                 goto end;
 931         }
 932
 933         /* Sub buffer size in byte */
 934         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 935                 config_element_subbuf_size, attr->subbuf_size);
 936         if (ret) {
 937                 goto end;
 938         }
 939
 940         /* Number of subbuffer (power of two) */
 941         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 942                 config_element_num_subbuf,
 943                 attr->num_subbuf);
 944         if (ret) {
 945                 goto end;
 946         }
 947
 948         /* Switch timer interval in usec */
 949         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 950                 config_element_switch_timer_interval,
 951                 attr->switch_timer_interval);
 952         if (ret) {
 953                 goto end;
 954         }
 955
 956         /* Read timer interval in usec */
 957         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 958                 config_element_read_timer_interval,
 959                 attr->read_timer_interval);
 960         if (ret) {
 961                 goto end;
 962         }
 963
 964         /* Monitor timer interval in usec */
 965         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 966                 config_element_monitor_timer_interval,
 967                 monitor_timer_interval);
 968         if (ret) {
 969                 goto end;
 970         }
 971
 972         /* Retry timeout in usec */
 973         ret = mi_lttng_writer_write_element_signed_int(writer,
 974                 config_element_blocking_timeout,
 975                 blocking_timeout);
 976         if (ret) {
 977                 goto end;
 978         }
 979
 980         /* Event output */
 981         ret = mi_lttng_writer_write_element_string(writer,
 982                 config_element_output_type,
 983                 attr->output == LTTNG_EVENT_SPLICE ?
 984                 config_output_type_splice : config_output_type_mmap);
 985         if (ret) {
 986                 goto end;
 987         }
 988
 989         /* Tracefile size in bytes */
 990         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 991                 config_element_tracefile_size, attr->tracefile_size);
 992         if (ret) {
 993                 goto end;
 994         }
 995
 996         /* Count of tracefiles */
 997         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 998                 config_element_tracefile_count,
 999                 attr->tracefile_count);
1000         if (ret) {
1001                 goto end;
1002         }
1003
1004         /* Live timer interval in usec*/
1005         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1006                 config_element_live_timer_interval,
1007                 attr->live_timer_interval);
1008         if (ret) {
1009                 goto end;
1010         }
1011
1012         /* Discarded events */
1013         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1014                 config_element_discarded_events,
1015                 discarded_events);
1016         if (ret) {
1017                 goto end;
1018         }
1019
1020         /* Lost packets */
1021         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1022                 config_element_lost_packets,
1023                 lost_packets);
1024         if (ret) {
1025                 goto end;
1026         }
1027
1028         /* Closing attributes */
1029         ret = mi_lttng_writer_close_element(writer);
1030         if (ret) {
1031                 goto end;
1032         }
1033 end:
1034         return ret;
1035
1036 }
1037
1038 LTTNG_HIDDEN
1039 int mi_lttng_event_common_attributes(struct mi_writer *writer,
1040                 struct lttng_event *event)
1041 {
1042         int ret;
1043         const char *filter_expression;
1044
1045         /* Open event element */
1046         ret = mi_lttng_writer_open_element(writer, config_element_event);
1047         if (ret) {
1048                 goto end;
1049         }
1050
1051         /* Event name */
1052         ret = mi_lttng_writer_write_element_string(writer,
1053                         config_element_name, event->name);
1054         if (ret) {
1055                 goto end;
1056         }
1057
1058         /* Event type */
1059         ret = mi_lttng_writer_write_element_string(writer,
1060                         config_element_type, mi_lttng_eventtype_string(event->type));
1061         if (ret) {
1062                 goto end;
1063         }
1064
1065         /* Is event enabled */
1066         ret = mi_lttng_writer_write_element_bool(writer,
1067                         config_element_enabled, event->enabled);
1068         if (ret) {
1069                 goto end;
1070         }
1071
1072         /* Event filter expression */
1073         ret = lttng_event_get_filter_expression(event, &filter_expression);
1074         if (ret) {
1075                 goto end;
1076         }
1077
1078         if (filter_expression) {
1079                 ret = mi_lttng_writer_write_element_string(writer,
1080                                 config_element_filter_expression,
1081                                 filter_expression);
1082                 if (ret) {
1083                         goto end;
1084                 }
1085         }
1086
1087 end:
1088         return ret;
1089 }
1090
1091 static int write_event_exclusions(struct mi_writer *writer,
1092                 struct lttng_event *event)
1093 {
1094         int i;
1095         int ret;
1096         int exclusion_count;
1097
1098         /* Open event exclusions */
1099         ret = mi_lttng_writer_open_element(writer, config_element_exclusions);
1100         if (ret) {
1101                 goto end;
1102         }
1103
1104         exclusion_count = lttng_event_get_exclusion_name_count(event);
1105         if (exclusion_count < 0) {
1106                 ret = exclusion_count;
1107                 goto end;
1108         }
1109
1110         for (i = 0; i < exclusion_count; i++) {
1111                 const char *name;
1112
1113                 ret = lttng_event_get_exclusion_name(event, i, &name);
1114                 if (ret) {
1115                         /* Close exclusions */
1116                         mi_lttng_writer_close_element(writer);
1117                         goto end;
1118                 }
1119
1120                 ret = mi_lttng_writer_write_element_string(writer,
1121                                 config_element_exclusion, name);
1122                 if (ret) {
1123                         /* Close exclusions */
1124                         mi_lttng_writer_close_element(writer);
1125                         goto end;
1126                 }
1127         }
1128
1129         /* Close exclusions */
1130         ret = mi_lttng_writer_close_element(writer);
1131
1132 end:
1133         return ret;
1134 }
1135
1136 LTTNG_HIDDEN
1137 int mi_lttng_event_tracepoint_loglevel(struct mi_writer *writer,
1138                 struct lttng_event *event, enum lttng_domain_type domain)
1139 {
1140         int ret;
1141
1142         /* Event loglevel */
1143         ret = mi_lttng_writer_write_element_string(writer,
1144                         config_element_loglevel,
1145                         mi_lttng_loglevel_string(event->loglevel, domain));
1146         if (ret) {
1147                 goto end;
1148         }
1149
1150         /* Log level type */
1151         ret = mi_lttng_writer_write_element_string(writer,
1152                         config_element_loglevel_type,
1153                         mi_lttng_logleveltype_string(event->loglevel_type));
1154         if (ret) {
1155                 goto end;
1156         }
1157
1158         /* Event exclusions */
1159         ret = write_event_exclusions(writer, event);
1160
1161 end:
1162         return ret;
1163 }
1164
1165 LTTNG_HIDDEN
1166 int mi_lttng_event_tracepoint_no_loglevel(struct mi_writer *writer,
1167                 struct lttng_event *event)
1168 {
1169         /* event exclusion filter */
1170         return write_event_exclusions(writer, event);
1171 }
1172
1173 LTTNG_HIDDEN
1174 int mi_lttng_event_function_probe(struct mi_writer *writer,
1175                 struct lttng_event *event)
1176 {
1177         int ret;
1178
1179         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1180         if (ret) {
1181                 goto end;
1182         }
1183
1184         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1185         if (ret) {
1186                 goto end;
1187         }
1188
1189         if (event->attr.probe.addr != 0) {
1190                 /* event probe address */
1191                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1192                                 config_element_address, event->attr.probe.addr);
1193                 if (ret) {
1194                         goto end;
1195                 }
1196         } else {
1197                 /* event probe offset */
1198                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1199                                 config_element_offset, event->attr.probe.offset);
1200                 if (ret) {
1201                         goto end;
1202                 }
1203
1204                 /* event probe symbol_name */
1205                 ret = mi_lttng_writer_write_element_string(writer,
1206                                 config_element_symbol_name, event->attr.probe.symbol_name);
1207                 if (ret) {
1208                         goto end;
1209                 }
1210         }
1211
1212         /* Close probe_attributes and attributes */
1213         ret = mi_lttng_close_multi_element(writer, 2);
1214 end:
1215         return ret;
1216 }
1217
1218 LTTNG_HIDDEN
1219 int mi_lttng_event_function_entry(struct mi_writer *writer,
1220                 struct lttng_event *event)
1221 {
1222         int ret;
1223
1224         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1225         if (ret) {
1226                 goto end;
1227         }
1228
1229         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1230         if (ret) {
1231                 goto end;
1232         }
1233
1234         /* event probe symbol_name */
1235         ret = mi_lttng_writer_write_element_string(writer,
1236                         config_element_symbol_name, event->attr.ftrace.symbol_name);
1237         if (ret) {
1238                 goto end;
1239         }
1240
1241         /* Close function_attributes and attributes */
1242         ret = mi_lttng_close_multi_element(writer, 2);
1243 end:
1244         return ret;
1245 }
1246
1247 LTTNG_HIDDEN
1248 int mi_lttng_events_open(struct mi_writer *writer)
1249 {
1250         return mi_lttng_writer_open_element(writer, config_element_events);
1251 }
1252
1253 LTTNG_HIDDEN
1254 int mi_lttng_event(struct mi_writer *writer,
1255                 struct lttng_event *event, int is_open, enum lttng_domain_type domain)
1256 {
1257         int ret;
1258
1259         ret = mi_lttng_event_common_attributes(writer, event);
1260         if (ret) {
1261                 goto end;
1262         }
1263
1264         switch (event->type) {
1265         case LTTNG_EVENT_TRACEPOINT:
1266         {
1267                 if (event->loglevel != -1) {
1268                         ret = mi_lttng_event_tracepoint_loglevel(writer, event, domain);
1269                 } else {
1270                         ret = mi_lttng_event_tracepoint_no_loglevel(writer, event);
1271                 }
1272                 break;
1273         }
1274         case LTTNG_EVENT_FUNCTION:
1275                 /* Fallthrough */
1276         case LTTNG_EVENT_PROBE:
1277                 ret = mi_lttng_event_function_probe(writer, event);
1278                 break;
1279         case LTTNG_EVENT_FUNCTION_ENTRY:
1280                 ret = mi_lttng_event_function_entry(writer, event);
1281                 break;
1282         case LTTNG_EVENT_ALL:
1283                 /* Fallthrough */
1284         default:
1285                 break;
1286         }
1287
1288         if (!is_open) {
1289                 ret = mi_lttng_writer_close_element(writer);
1290         }
1291
1292 end:
1293         return ret;
1294 }
1295
1296 LTTNG_HIDDEN
1297 int mi_lttng_trackers_open(struct mi_writer *writer)
1298 {
1299         return mi_lttng_writer_open_element(writer, config_element_trackers);
1300 }
1301
1302 LTTNG_HIDDEN
1303 int mi_lttng_pid_tracker_open(struct mi_writer *writer)
1304 {
1305         int ret;
1306
1307         /* Open element pid_tracker */
1308         ret = mi_lttng_writer_open_element(writer, config_element_pid_tracker);
1309         if (ret) {
1310                 goto end;
1311         }
1312
1313         /* Open targets element */
1314         ret = mi_lttng_targets_open(writer);
1315 end:
1316         return ret;
1317 }
1318
1319 LTTNG_HIDDEN
1320 int mi_lttng_pids_open(struct mi_writer *writer)
1321 {
1322         return mi_lttng_writer_open_element(writer, config_element_pids);
1323 }
1324
1325 /*
1326  * TODO: move the listing of pid for user agent to process semantic on
1327  * mi api bump. The use of process element break the mi api.
1328  */
1329 LTTNG_HIDDEN
1330 int mi_lttng_pid(struct mi_writer *writer, pid_t pid , const char *name,
1331                 int is_open)
1332 {
1333         int ret;
1334
1335         /* Open pid process */
1336         ret = mi_lttng_writer_open_element(writer, config_element_pid);
1337         if (ret) {
1338                 goto end;
1339         }
1340
1341         /* Writing pid number */
1342         ret = mi_lttng_writer_write_element_signed_int(writer,
1343                         mi_lttng_element_pid_id, (int)pid);
1344         if (ret) {
1345                 goto end;
1346         }
1347
1348         /* Writing name of the process */
1349         if (name) {
1350                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1351                                 name);
1352                 if (ret) {
1353                         goto end;
1354                 }
1355         }
1356
1357         if (!is_open) {
1358                 /* Closing Pid */
1359                 ret = mi_lttng_writer_close_element(writer);
1360         }
1361
1362 end:
1363         return ret;
1364 }
1365
1366 LTTNG_HIDDEN
1367 int mi_lttng_targets_open(struct mi_writer *writer)
1368 {
1369         return mi_lttng_writer_open_element(writer,
1370                         config_element_targets);
1371 }
1372
1373 LTTNG_HIDDEN
1374 int mi_lttng_pid_target(struct mi_writer *writer, pid_t pid, int is_open)
1375 {
1376         int ret;
1377
1378         ret = mi_lttng_writer_open_element(writer,
1379                         config_element_target_pid);
1380         if (ret) {
1381                 goto end;
1382         }
1383
1384         /* Writing pid number
1385          * Special case for element all on track untrack command
1386          * All pid is represented as wildcard *
1387          */
1388         if ((int) pid == -1) {
1389                 ret = mi_lttng_writer_write_element_string(writer,
1390                                 config_element_pid,
1391                                 mi_lttng_element_track_untrack_all_wildcard);
1392         } else {
1393                 ret = mi_lttng_writer_write_element_signed_int(writer,
1394                                 config_element_pid, (int) pid);
1395         }
1396         if (ret) {
1397                 goto end;
1398         }
1399
1400         if (!is_open) {
1401                 ret = mi_lttng_writer_close_element(writer);
1402                 if (ret) {
1403                         goto end;
1404                 }
1405         }
1406
1407 end:
1408         return ret;
1409 }
1410
1411 LTTNG_HIDDEN
1412 int mi_lttng_event_fields_open(struct mi_writer *writer)
1413 {
1414         return mi_lttng_writer_open_element(writer, mi_lttng_element_event_fields);
1415 }
1416
1417 LTTNG_HIDDEN
1418 int mi_lttng_event_field(struct mi_writer *writer,
1419                 struct lttng_event_field *field)
1420 {
1421         int ret;
1422
1423         if (!field->field_name[0]) {
1424                 ret = 0;
1425                 goto end;
1426         }
1427
1428         /* Open field */
1429         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_event_field);
1430         if (ret) {
1431                 goto end;
1432         }
1433
1434         if (!field->field_name[0]) {
1435                 goto close;
1436         }
1437
1438         /* Name */
1439         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1440                         field->field_name);
1441         if (ret) {
1442                 goto end;
1443         }
1444
1445         /* Type */
1446         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1447                         mi_lttng_eventfieldtype_string(field->type));
1448         if (ret) {
1449                 goto end;
1450         }
1451
1452         /* nowrite  */
1453         ret = mi_lttng_writer_write_element_signed_int(writer,
1454                         mi_lttng_element_nowrite, field->nowrite);
1455         if (ret) {
1456                 goto end;
1457         }
1458
1459 close:
1460         /* Close field element */
1461         ret = mi_lttng_writer_close_element(writer);
1462
1463 end:
1464         return ret;
1465 }
1466
1467 LTTNG_HIDDEN
1468 int mi_lttng_perf_counter_context(struct mi_writer *writer,
1469                 struct lttng_event_perf_counter_ctx  *perf_context)
1470 {
1471         int ret;
1472
1473         /* Open perf_counter_context */
1474         ret = mi_lttng_writer_open_element(writer,
1475                         mi_lttng_element_perf_counter_context);
1476         if (ret) {
1477                 goto end;
1478         }
1479
1480         /* Type */
1481         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1482                         config_element_type, perf_context->type);
1483         if (ret) {
1484                 goto end;
1485         }
1486
1487         /* Config */
1488         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1489                         config_element_config, perf_context->config);
1490         if (ret) {
1491                 goto end;
1492         }
1493
1494         /* Name of the perf counter */
1495         ret = mi_lttng_writer_write_element_string(writer,
1496                         config_element_name, perf_context->name);
1497         if (ret) {
1498                 goto end;
1499         }
1500
1501         /* Close perf_counter_context */
1502         ret = mi_lttng_writer_close_element(writer);
1503 end:
1504         return ret;
1505 }
1506
1507 static
1508 int mi_lttng_app_context(struct mi_writer *writer,
1509                 const char *provider_name, const char *ctx_name)
1510 {
1511         int ret;
1512
1513         /* Open app */
1514         ret = mi_lttng_writer_open_element(writer,
1515                         config_element_context_app);
1516         if (ret) {
1517                 goto end;
1518         }
1519
1520         /* provider_name */
1521         ret = mi_lttng_writer_write_element_string(writer,
1522                         config_element_context_app_provider_name,
1523                         provider_name);
1524         if (ret) {
1525                 goto end;
1526         }
1527
1528         /* ctx_name */
1529         ret = mi_lttng_writer_write_element_string(writer,
1530                         config_element_context_app_ctx_name, ctx_name);
1531         if (ret) {
1532                 goto end;
1533         }
1534
1535         /* Close app */
1536         ret = mi_lttng_writer_close_element(writer);
1537 end:
1538         return ret;
1539 }
1540
1541 LTTNG_HIDDEN
1542 int mi_lttng_context(struct mi_writer *writer,
1543                 struct lttng_event_context *context, int is_open)
1544 {
1545         int ret;
1546
1547         /* Open context */
1548         ret = mi_lttng_writer_open_element(writer , config_element_context);
1549         if (ret) {
1550                 goto end;
1551         }
1552
1553         /* Special case for PERF_*_COUNTER
1554          * print the lttng_event_perf_counter_ctx*/
1555         switch (context->ctx) {
1556         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
1557         case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
1558         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
1559         {
1560                 struct lttng_event_perf_counter_ctx *perf_context =
1561                                 &context->u.perf_counter;
1562                 ret =  mi_lttng_perf_counter_context(writer, perf_context);
1563                 if (ret) {
1564                         goto end;
1565                 }
1566                 break;
1567         }
1568         case LTTNG_EVENT_CONTEXT_APP_CONTEXT:
1569         {
1570                 ret = mi_lttng_app_context(writer,
1571                                 context->u.app_ctx.provider_name,
1572                                 context->u.app_ctx.ctx_name);
1573                 if (ret) {
1574                         goto end;
1575                 }
1576                 break;
1577         }
1578         default:
1579         {
1580                 const char *type_string = mi_lttng_event_contexttype_string(
1581                                 context->ctx);
1582                 if (!type_string) {
1583                         ret = -LTTNG_ERR_INVALID;
1584                         goto end;
1585                 }
1586
1587                 /* Print context type */
1588                 ret = mi_lttng_writer_write_element_string(writer,
1589                                 config_element_type, type_string);
1590                 break;
1591         }
1592         }
1593
1594         /* Close context */
1595         if (!is_open) {
1596                 ret = mi_lttng_writer_close_element(writer);
1597         }
1598
1599 end:
1600         return ret;
1601 }
1602
1603 LTTNG_HIDDEN
1604 int mi_lttng_snapshot_output_session_name(struct mi_writer *writer,
1605                 const char *session_name)
1606 {
1607         int ret;
1608
1609         /* Open session element */
1610         ret = mi_lttng_writer_open_element(writer, config_element_session);
1611         if (ret) {
1612                 goto end;
1613         }
1614
1615         /* Snapshot output list for current session name */
1616         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1617                         session_name);
1618         if (ret) {
1619                 goto end;
1620         }
1621
1622         /* Open element snapshots (sequence one snapshot) */
1623         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_snapshots);
1624         if (ret) {
1625                 goto end;
1626         }
1627
1628 end:
1629         return ret;
1630 }
1631
1632 LTTNG_HIDDEN
1633 int mi_lttng_snapshot_list_output(struct mi_writer *writer,
1634                 struct lttng_snapshot_output *output)
1635 {
1636         int ret;
1637
1638         /* Open element snapshot output */
1639         ret = mi_lttng_writer_open_element(writer,
1640                         mi_lttng_element_command_snapshot);
1641         if (ret) {
1642                 goto end;
1643         }
1644
1645         /* ID of the snapshot output */
1646         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1647                         mi_lttng_element_id, output->id);
1648         if (ret) {
1649                 goto end;
1650         }
1651
1652         /* Name of the output */
1653         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1654                         output->name);
1655         if (ret) {
1656                 goto end;
1657         }
1658
1659         /* Destination of the output (ctrl_url)*/
1660         ret = mi_lttng_writer_write_element_string(writer,
1661                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1662         if (ret) {
1663                 goto end;
1664         }
1665
1666         /* Destination of the output (data_url) */
1667         ret = mi_lttng_writer_write_element_string(writer,
1668                         mi_lttng_element_snapshot_data_url, output->data_url);
1669         if (ret) {
1670                 goto end;
1671         }
1672
1673         /* total size of all stream combined */
1674         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1675                         mi_lttng_element_snapshot_max_size, output->max_size);
1676         if (ret) {
1677                 goto end;
1678         }
1679
1680         /* Close snapshot output element */
1681         ret = mi_lttng_writer_close_element(writer);
1682
1683 end:
1684         return ret;
1685 }
1686
1687 LTTNG_HIDDEN
1688 int mi_lttng_snapshot_del_output(struct mi_writer *writer, int id,
1689                 const char *name, const char *current_session_name)
1690 {
1691         int ret;
1692
1693         /* Open element del_snapshot */
1694         ret = mi_lttng_writer_open_element(writer,
1695                         mi_lttng_element_command_snapshot);
1696         if (ret) {
1697                 goto end;
1698         }
1699
1700
1701         if (id != UINT32_MAX) {
1702                 /* "Snapshot output "id" successfully deleted
1703                  * for "current_session_name"
1704                  * ID of the snapshot output
1705                  */
1706                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1707                                 mi_lttng_element_id, id);
1708                 if (ret) {
1709                         goto end;
1710                 }
1711         } else {
1712                 /* "Snapshot output "name" successfully deleted
1713                  * for session "current_session_name"
1714                  * Name of the output
1715                  */
1716                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1717                                 name);
1718                 if (ret) {
1719                         goto end;
1720                 }
1721         }
1722
1723         /* Snapshot was deleted for session "current_session_name"*/
1724         ret = mi_lttng_writer_write_element_string(writer,
1725                         mi_lttng_element_snapshot_session_name,
1726                         current_session_name);
1727         if (ret) {
1728                 goto end;
1729         }
1730
1731         /* Close snapshot element */
1732         ret = mi_lttng_writer_close_element(writer);
1733
1734 end:
1735         return ret;
1736 }
1737
1738 LTTNG_HIDDEN
1739 int mi_lttng_snapshot_add_output(struct mi_writer *writer,
1740                 const char *current_session_name, const char *n_ptr,
1741                 struct lttng_snapshot_output *output)
1742 {
1743         int ret;
1744
1745         /* Open element snapshot */
1746         ret = mi_lttng_writer_open_element(writer,
1747                         mi_lttng_element_command_snapshot);
1748         if (ret) {
1749                 goto end;
1750         }
1751
1752         /* Snapshot output id */
1753         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1754                         mi_lttng_element_id, output->id);
1755         if (ret) {
1756                 goto end;
1757         }
1758
1759         /* Snapshot output names */
1760         ret = mi_lttng_writer_write_element_string(writer,
1761                         config_element_name, n_ptr);
1762         if (ret) {
1763                 goto end;
1764         }
1765
1766         /* Destination of the output (ctrl_url)*/
1767         ret = mi_lttng_writer_write_element_string(writer,
1768                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1769         if (ret) {
1770                 goto end;
1771         }
1772
1773         /* Snapshot added for session "current_session_name"*/
1774         ret = mi_lttng_writer_write_element_string(writer,
1775                         mi_lttng_element_snapshot_session_name, current_session_name);
1776         if (ret) {
1777                 goto end;
1778         }
1779
1780         /* total size of all stream combined */
1781         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1782                         mi_lttng_element_snapshot_max_size, output->max_size);
1783         if (ret) {
1784                 goto end;
1785         }
1786
1787         /* Close snapshot element */
1788         ret = mi_lttng_writer_close_element(writer);
1789
1790 end:
1791         return ret;
1792 }
1793
1794 LTTNG_HIDDEN
1795 int mi_lttng_snapshot_record(struct mi_writer *writer,
1796                 const char *current_session_name, const char *url,
1797                 const char *cmdline_ctrl_url, const char *cmdline_data_url)
1798 {
1799         int ret;
1800
1801         /* Open element snapshot */
1802         ret = mi_lttng_writer_open_element(writer,
1803                         mi_lttng_element_command_snapshot);
1804         if (ret) {
1805                 goto end;
1806         }
1807
1808         /*
1809          * If a valid an URL was given, serialize it,
1810          * else take the command line data and ctrl urls*/
1811         if (url) {
1812                 /* Destination of the output (ctrl_url)*/
1813                 ret = mi_lttng_writer_write_element_string(writer,
1814                                 mi_lttng_element_snapshot_ctrl_url, url);
1815                 if (ret) {
1816                         goto end;
1817                 }
1818         } else if (cmdline_ctrl_url) {
1819                 /* Destination of the output (ctrl_url)*/
1820                 ret = mi_lttng_writer_write_element_string(writer,
1821                                 mi_lttng_element_snapshot_ctrl_url, cmdline_ctrl_url);
1822                 if (ret) {
1823                         goto end;
1824                 }
1825
1826                 /* Destination of the output (data_url) */
1827                 ret = mi_lttng_writer_write_element_string(writer,
1828                                 mi_lttng_element_snapshot_data_url, cmdline_data_url);
1829                 if (ret) {
1830                         goto end;
1831                 }
1832         }
1833
1834         /* Close record_snapshot element */
1835         ret = mi_lttng_writer_close_element(writer);
1836
1837 end:
1838         return ret;
1839 }