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