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
  79 /* Strings related to version command */
  80 const char * const mi_lttng_element_version = "version";
  81 const char * const mi_lttng_element_version_commit = "commit";
  82 const char * const mi_lttng_element_version_description = "description";
  83 const char * const mi_lttng_element_version_license = "license";
  84 const char * const mi_lttng_element_version_major = "major";
  85 const char * const mi_lttng_element_version_minor = "minor";
  86 const char * const mi_lttng_element_version_patch_level = "patchLevel";
  87 const char * const mi_lttng_element_version_str = "string";
  88 const char * const mi_lttng_element_version_web = "url";
  89
  90 /* String related to a lttng_event_field */
  91 const char * const mi_lttng_element_event_field = "event_field";
  92 const char * const mi_lttng_element_event_fields = "event_fields";
  93
  94 /* String related to lttng_event_perf_counter_ctx */
  95 const char * const mi_lttng_element_perf_counter_context = "perf";
  96
  97 /* Strings related to pid */
  98 const char * const mi_lttng_element_pid_id = "id";
  99
 100 /* Strings related to save command */
 101 const char * const mi_lttng_element_save = "save";
 102
 103 /* Strings related to load command */
 104 const char * const mi_lttng_element_load = "load";
 105 LTTNG_HIDDEN const char * const mi_lttng_element_load_overrides = "overrides";
 106 LTTNG_HIDDEN const char * const mi_lttng_element_load_override_url = "url";
 107
 108 /* General elements of mi_lttng */
 109 const char * const mi_lttng_element_empty = "";
 110 const char * const mi_lttng_element_id = "id";
 111 const char * const mi_lttng_element_nowrite = "nowrite";
 112 const char * const mi_lttng_element_success = "success";
 113 const char * const mi_lttng_element_type_enum = "ENUM";
 114 const char * const mi_lttng_element_type_float = "FLOAT";
 115 const char * const mi_lttng_element_type_integer = "INTEGER";
 116 const char * const mi_lttng_element_type_other = "OTHER";
 117 const char * const mi_lttng_element_type_string = "STRING";
 118
 119 /* String related to loglevel */
 120 const char * const mi_lttng_loglevel_str_alert = "TRACE_ALERT";
 121 const char * const mi_lttng_loglevel_str_crit = "TRACE_CRIT";
 122 const char * const mi_lttng_loglevel_str_debug = "TRACE_DEBUG";
 123 const char * const mi_lttng_loglevel_str_debug_function = "TRACE_DEBUG_FUNCTION";
 124 const char * const mi_lttng_loglevel_str_debug_line = "TRACE_DEBUG_LINE";
 125 const char * const mi_lttng_loglevel_str_debug_module = "TRACE_DEBUG_MODULE";
 126 const char * const mi_lttng_loglevel_str_debug_process = "TRACE_DEBUG_PROCESS";
 127 const char * const mi_lttng_loglevel_str_debug_program = "TRACE_DEBUG_PROGRAM";
 128 const char * const mi_lttng_loglevel_str_debug_system = "TRACE_DEBUG_SYSTEM";
 129 const char * const mi_lttng_loglevel_str_debug_unit = "TRACE_DEBUG_UNIT";
 130 const char * const mi_lttng_loglevel_str_emerg = "TRACE_EMERG";
 131 const char * const mi_lttng_loglevel_str_err = "TRACE_ERR";
 132 const char * const mi_lttng_loglevel_str_info = "TRACE_INFO";
 133 const char * const mi_lttng_loglevel_str_notice = "TRACE_NOTICE";
 134 const char * const mi_lttng_loglevel_str_unknown = "UNKNOWN";
 135 const char * const mi_lttng_loglevel_str_warning = "TRACE_WARNING";
 136
 137 /* String related to loglevel JUL */
 138 const char * const mi_lttng_loglevel_str_jul_all = "JUL_ALL";
 139 const char * const mi_lttng_loglevel_str_jul_config = "JUL_CONFIG";
 140 const char * const mi_lttng_loglevel_str_jul_fine = "JUL_FINE";
 141 const char * const mi_lttng_loglevel_str_jul_finer = "JUL_FINER";
 142 const char * const mi_lttng_loglevel_str_jul_finest = "JUL_FINEST";
 143 const char * const mi_lttng_loglevel_str_jul_info = "JUL_INFO";
 144 const char * const mi_lttng_loglevel_str_jul_off = "JUL_OFF";
 145 const char * const mi_lttng_loglevel_str_jul_severe = "JUL_SEVERE";
 146 const char * const mi_lttng_loglevel_str_jul_warning = "JUL_WARNING";
 147
 148 /* String related to loglevel LOG4J */
 149 const char * const mi_lttng_loglevel_str_log4j_off = "LOG4J_OFF";
 150 const char * const mi_lttng_loglevel_str_log4j_fatal = "LOG4J_FATAL";
 151 const char * const mi_lttng_loglevel_str_log4j_error = "LOG4J_ERROR";
 152 const char * const mi_lttng_loglevel_str_log4j_warn = "LOG4J_WARN";
 153 const char * const mi_lttng_loglevel_str_log4j_info = "LOG4J_INFO";
 154 const char * const mi_lttng_loglevel_str_log4j_debug = "LOG4J_DEBUG";
 155 const char * const mi_lttng_loglevel_str_log4j_trace = "LOG4J_TRACE";
 156 const char * const mi_lttng_loglevel_str_log4j_all = "LOG4J_ALL";
 157
 158 /* String related to loglevel Python */
 159 const char * const mi_lttng_loglevel_str_python_critical = "PYTHON_CRITICAL";
 160 const char * const mi_lttng_loglevel_str_python_error = "PYTHON_ERROR";
 161 const char * const mi_lttng_loglevel_str_python_warning = "PYTHON_WARNING";
 162 const char * const mi_lttng_loglevel_str_python_info = "PYTHON_INFO";
 163 const char * const mi_lttng_loglevel_str_python_debug = "PYTHON_DEBUG";
 164 const char * const mi_lttng_loglevel_str_python_notset = "PYTHON_NOTSET";
 165
 166 /* String related to loglevel type */
 167 const char * const mi_lttng_loglevel_type_all = "ALL";
 168 const char * const mi_lttng_loglevel_type_range = "RANGE";
 169 const char * const mi_lttng_loglevel_type_single = "SINGLE";
 170 const char * const mi_lttng_loglevel_type_unknown = "UNKNOWN";
 171
 172 /* String related to a lttng_snapshot_output */
 173 const char * const mi_lttng_element_snapshot_ctrl_url = "ctrl_url";
 174 const char * const mi_lttng_element_snapshot_data_url = "data_url";
 175 const char * const mi_lttng_element_snapshot_max_size = "max_size";
 176 const char * const mi_lttng_element_snapshot_n_ptr = "n_ptr";
 177 const char * const mi_lttng_element_snapshot_session_name = "session_name";
 178 const char * const mi_lttng_element_snapshots = "snapshots";
 179
 180 /* String related to track/untrack command */
 181 const char * const mi_lttng_element_track_untrack_all_wildcard = "*";
 182
 183 /* Deprecated symbols preserved for ABI compatibility. */
 184 const char * const mi_lttng_context_type_perf_counter;
 185 const char * const mi_lttng_context_type_perf_cpu_counter;
 186 const char * const mi_lttng_context_type_perf_thread_counter;
 187 const char * const mi_lttng_element_track_untrack_pid_target;
 188 const char * const mi_lttng_element_track_untrack_targets;
 189 const char * const mi_lttng_element_calibrate;
 190 const char * const mi_lttng_element_calibrate_function;
 191 const char * const mi_lttng_element_command_calibrate;
 192
 193 /* This is a merge of jul loglevel and regular loglevel
 194  * Those should never overlap by definition
 195  * (see struct lttng_event loglevel)
 196  */
 197 LTTNG_HIDDEN
 198 const char *mi_lttng_loglevel_string(int value, enum lttng_domain_type domain)
 199 {
 200         switch (domain) {
 201         case LTTNG_DOMAIN_KERNEL:
 202         case LTTNG_DOMAIN_UST:
 203                 switch (value) {
 204                 case -1:
 205                         return mi_lttng_element_empty;
 206                 case LTTNG_LOGLEVEL_EMERG:
 207                         return mi_lttng_loglevel_str_emerg;
 208                 case LTTNG_LOGLEVEL_ALERT:
 209                         return mi_lttng_loglevel_str_alert;
 210                 case LTTNG_LOGLEVEL_CRIT:
 211                         return mi_lttng_loglevel_str_crit;
 212                 case LTTNG_LOGLEVEL_ERR:
 213                         return mi_lttng_loglevel_str_err;
 214                 case LTTNG_LOGLEVEL_WARNING:
 215                         return mi_lttng_loglevel_str_warning;
 216                 case LTTNG_LOGLEVEL_NOTICE:
 217                         return mi_lttng_loglevel_str_notice;
 218                 case LTTNG_LOGLEVEL_INFO:
 219                         return mi_lttng_loglevel_str_info;
 220                 case LTTNG_LOGLEVEL_DEBUG_SYSTEM:
 221                         return mi_lttng_loglevel_str_debug_system;
 222                 case LTTNG_LOGLEVEL_DEBUG_PROGRAM:
 223                         return mi_lttng_loglevel_str_debug_program;
 224                 case LTTNG_LOGLEVEL_DEBUG_PROCESS:
 225                         return mi_lttng_loglevel_str_debug_process;
 226                 case LTTNG_LOGLEVEL_DEBUG_MODULE:
 227                         return mi_lttng_loglevel_str_debug_module;
 228                 case LTTNG_LOGLEVEL_DEBUG_UNIT:
 229                         return mi_lttng_loglevel_str_debug_unit;
 230                 case LTTNG_LOGLEVEL_DEBUG_FUNCTION:
 231                         return mi_lttng_loglevel_str_debug_function;
 232                 case LTTNG_LOGLEVEL_DEBUG_LINE:
 233                         return mi_lttng_loglevel_str_debug_line;
 234                 case LTTNG_LOGLEVEL_DEBUG:
 235                         return mi_lttng_loglevel_str_debug;
 236                 default:
 237                         return mi_lttng_loglevel_str_unknown;
 238                 }
 239                 break;
 240         case LTTNG_DOMAIN_LOG4J:
 241                 switch (value) {
 242                 case -1:
 243                         return mi_lttng_element_empty;
 244                 case LTTNG_LOGLEVEL_LOG4J_OFF:
 245                         return mi_lttng_loglevel_str_log4j_off;
 246                 case LTTNG_LOGLEVEL_LOG4J_FATAL:
 247                         return mi_lttng_loglevel_str_log4j_fatal;
 248                 case LTTNG_LOGLEVEL_LOG4J_ERROR:
 249                         return mi_lttng_loglevel_str_log4j_error;
 250                 case LTTNG_LOGLEVEL_LOG4J_WARN:
 251                         return mi_lttng_loglevel_str_log4j_warn;
 252                 case LTTNG_LOGLEVEL_LOG4J_INFO:
 253                         return mi_lttng_loglevel_str_log4j_info;
 254                 case LTTNG_LOGLEVEL_LOG4J_DEBUG:
 255                         return mi_lttng_loglevel_str_log4j_debug;
 256                 case LTTNG_LOGLEVEL_LOG4J_TRACE:
 257                         return mi_lttng_loglevel_str_log4j_trace;
 258                 case LTTNG_LOGLEVEL_LOG4J_ALL:
 259                         return mi_lttng_loglevel_str_log4j_all;
 260                 default:
 261                         return mi_lttng_loglevel_str_unknown;
 262                 }
 263                 break;
 264         case LTTNG_DOMAIN_JUL:
 265                 switch (value) {
 266                 case -1:
 267                         return mi_lttng_element_empty;
 268                 case LTTNG_LOGLEVEL_JUL_OFF:
 269                         return mi_lttng_loglevel_str_jul_off;
 270                 case LTTNG_LOGLEVEL_JUL_SEVERE:
 271                         return mi_lttng_loglevel_str_jul_severe;
 272                 case LTTNG_LOGLEVEL_JUL_WARNING:
 273                         return mi_lttng_loglevel_str_jul_warning;
 274                 case LTTNG_LOGLEVEL_JUL_INFO:
 275                         return mi_lttng_loglevel_str_jul_info;
 276                 case LTTNG_LOGLEVEL_JUL_CONFIG:
 277                         return mi_lttng_loglevel_str_jul_config;
 278                 case LTTNG_LOGLEVEL_JUL_FINE:
 279                         return mi_lttng_loglevel_str_jul_fine;
 280                 case LTTNG_LOGLEVEL_JUL_FINER:
 281                         return mi_lttng_loglevel_str_jul_finer;
 282                 case LTTNG_LOGLEVEL_JUL_FINEST:
 283                         return mi_lttng_loglevel_str_jul_finest;
 284                 case LTTNG_LOGLEVEL_JUL_ALL:
 285                         return mi_lttng_loglevel_str_jul_all;
 286                 default:
 287                         return mi_lttng_loglevel_str_unknown;
 288                 }
 289                 break;
 290         case LTTNG_DOMAIN_PYTHON:
 291                 switch (value) {
 292                 case LTTNG_LOGLEVEL_PYTHON_CRITICAL:
 293                         return mi_lttng_loglevel_str_python_critical;
 294                 case LTTNG_LOGLEVEL_PYTHON_ERROR:
 295                         return mi_lttng_loglevel_str_python_error;
 296                 case LTTNG_LOGLEVEL_PYTHON_WARNING:
 297                         return mi_lttng_loglevel_str_python_warning;
 298                 case LTTNG_LOGLEVEL_PYTHON_INFO:
 299                         return mi_lttng_loglevel_str_python_info;
 300                 case LTTNG_LOGLEVEL_PYTHON_DEBUG:
 301                         return mi_lttng_loglevel_str_python_debug;
 302                 case LTTNG_LOGLEVEL_PYTHON_NOTSET:
 303                         return mi_lttng_loglevel_str_python_notset;
 304                 default:
 305                         return mi_lttng_loglevel_str_unknown;
 306                 }
 307                 break;
 308         default:
 309                 return mi_lttng_loglevel_str_unknown;
 310         }
 311 }
 312
 313 LTTNG_HIDDEN
 314 const char *mi_lttng_logleveltype_string(enum lttng_loglevel_type value)
 315 {
 316         switch (value) {
 317         case LTTNG_EVENT_LOGLEVEL_ALL:
 318                 return mi_lttng_loglevel_type_all;
 319         case LTTNG_EVENT_LOGLEVEL_RANGE:
 320                 return mi_lttng_loglevel_type_range;
 321         case LTTNG_EVENT_LOGLEVEL_SINGLE:
 322                 return mi_lttng_loglevel_type_single;
 323         default:
 324                 return mi_lttng_loglevel_type_unknown;
 325         }
 326 }
 327
 328 LTTNG_HIDDEN
 329 const char *mi_lttng_eventtype_string(enum lttng_event_type value)
 330 {
 331         switch (value) {
 332         case LTTNG_EVENT_ALL:
 333                 return config_event_type_all;
 334         case LTTNG_EVENT_TRACEPOINT:
 335                 return config_event_type_tracepoint;
 336         case LTTNG_EVENT_PROBE:
 337                 return config_event_type_probe;
 338         case LTTNG_EVENT_FUNCTION:
 339                 return config_event_type_function;
 340         case LTTNG_EVENT_FUNCTION_ENTRY:
 341                 return config_event_type_function_entry;
 342         case LTTNG_EVENT_SYSCALL:
 343                 return config_event_type_syscall;
 344         case LTTNG_EVENT_NOOP:
 345                 return config_event_type_noop;
 346         default:
 347                 return mi_lttng_element_empty;
 348         }
 349 }
 350
 351 static
 352 const char *mi_lttng_event_contexttype_string(enum lttng_event_context_type val)
 353 {
 354         switch (val) {
 355         case LTTNG_EVENT_CONTEXT_PID:
 356                 return config_event_context_pid;
 357         case LTTNG_EVENT_CONTEXT_PROCNAME:
 358                 return config_event_context_procname;
 359         case LTTNG_EVENT_CONTEXT_PRIO:
 360                 return config_event_context_prio;
 361         case LTTNG_EVENT_CONTEXT_NICE:
 362                 return config_event_context_nice;
 363         case LTTNG_EVENT_CONTEXT_VPID:
 364                 return config_event_context_vpid;
 365         case LTTNG_EVENT_CONTEXT_TID:
 366                 return config_event_context_tid;
 367         case LTTNG_EVENT_CONTEXT_VTID:
 368                 return config_event_context_vtid;
 369         case LTTNG_EVENT_CONTEXT_PPID:
 370                 return config_event_context_ppid;
 371         case LTTNG_EVENT_CONTEXT_VPPID:
 372                 return config_event_context_vppid;
 373         case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
 374                 return config_event_context_pthread_id;
 375         case LTTNG_EVENT_CONTEXT_HOSTNAME:
 376                 return config_event_context_hostname;
 377         case LTTNG_EVENT_CONTEXT_IP:
 378                 return config_event_context_ip;
 379         default:
 380                 return NULL;
 381         }
 382 }
 383
 384 LTTNG_HIDDEN
 385 const char *mi_lttng_eventfieldtype_string(enum lttng_event_field_type val)
 386 {
 387         switch (val) {
 388         case(LTTNG_EVENT_FIELD_INTEGER):
 389                 return mi_lttng_element_type_integer;
 390         case(LTTNG_EVENT_FIELD_ENUM):
 391                 return mi_lttng_element_type_enum;
 392         case(LTTNG_EVENT_FIELD_FLOAT):
 393                 return mi_lttng_element_type_float;
 394         case(LTTNG_EVENT_FIELD_STRING):
 395                 return mi_lttng_element_type_string;
 396         default:
 397                 return mi_lttng_element_type_other;
 398         }
 399 }
 400
 401 LTTNG_HIDDEN
 402 const char *mi_lttng_domaintype_string(enum lttng_domain_type value)
 403 {
 404         /* Note: This is a *duplicate* of get_domain_str from bin/lttng/utils.c */
 405         switch (value) {
 406         case LTTNG_DOMAIN_KERNEL:
 407                 return config_domain_type_kernel;
 408         case LTTNG_DOMAIN_UST:
 409                 return config_domain_type_ust;
 410         case LTTNG_DOMAIN_JUL:
 411                 return config_domain_type_jul;
 412         case LTTNG_DOMAIN_LOG4J:
 413                 return config_domain_type_log4j;
 414         case LTTNG_DOMAIN_PYTHON:
 415                 return config_domain_type_python;
 416         default:
 417                 /* Should not have an unknown domain */
 418                 assert(0);
 419                 return NULL;
 420         }
 421 }
 422
 423 LTTNG_HIDDEN
 424 const char *mi_lttng_buffertype_string(enum lttng_buffer_type value)
 425 {
 426         switch (value) {
 427         case LTTNG_BUFFER_PER_PID:
 428                 return config_buffer_type_per_pid;
 429         case LTTNG_BUFFER_PER_UID:
 430                 return config_buffer_type_per_uid;
 431         case LTTNG_BUFFER_GLOBAL:
 432                 return config_buffer_type_global;
 433         default:
 434                 /* Should not have an unknow buffer type */
 435                 assert(0);
 436                 return NULL;
 437         }
 438 }
 439
 440 LTTNG_HIDDEN
 441 struct mi_writer *mi_lttng_writer_create(int fd_output, int mi_output_type)
 442 {
 443         struct mi_writer *mi_writer;
 444
 445         mi_writer = zmalloc(sizeof(struct mi_writer));
 446         if (!mi_writer) {
 447                 PERROR("zmalloc mi_writer_create");
 448                 goto end;
 449         }
 450         if (mi_output_type == LTTNG_MI_XML) {
 451                 mi_writer->writer = config_writer_create(fd_output, 0);
 452                 if (!mi_writer->writer) {
 453                         goto err_destroy;
 454                 }
 455                 mi_writer->type = LTTNG_MI_XML;
 456         } else {
 457                 goto err_destroy;
 458         }
 459
 460 end:
 461         return mi_writer;
 462
 463 err_destroy:
 464         free(mi_writer);
 465         return NULL;
 466 }
 467
 468 LTTNG_HIDDEN
 469 int mi_lttng_writer_destroy(struct mi_writer *writer)
 470 {
 471         int ret;
 472
 473         if (!writer) {
 474                 ret = -EINVAL;
 475                 goto end;
 476         }
 477
 478         ret = config_writer_destroy(writer->writer);
 479         if (ret < 0) {
 480                 goto end;
 481         }
 482
 483         free(writer);
 484 end:
 485         return ret;
 486 }
 487
 488 LTTNG_HIDDEN
 489 int mi_lttng_writer_command_open(struct mi_writer *writer, const char *command)
 490 {
 491         int ret;
 492
 493         /*
 494          * A command is always the MI's root node, it must declare the current
 495          * namespace and schema URIs and the schema's version.
 496          */
 497         ret = config_writer_open_element(writer->writer,
 498                         mi_lttng_element_command);
 499         if (ret) {
 500                 goto end;
 501         }
 502
 503         ret = config_writer_write_attribute(writer->writer,
 504                         mi_lttng_xmlns, DEFAULT_LTTNG_MI_NAMESPACE);
 505         if (ret) {
 506                 goto end;
 507         }
 508
 509         ret = config_writer_write_attribute(writer->writer,
 510                         mi_lttng_xmlns_xsi, mi_lttng_w3_schema_uri);
 511         if (ret) {
 512                 goto end;
 513         }
 514
 515         ret = config_writer_write_attribute(writer->writer,
 516                         mi_lttng_schema_location,
 517                         mi_lttng_schema_location_uri);
 518         if (ret) {
 519                 goto end;
 520         }
 521
 522         ret = config_writer_write_attribute(writer->writer,
 523                         mi_lttng_schema_version,
 524                         mi_lttng_schema_version_value);
 525         if (ret) {
 526                 goto end;
 527         }
 528
 529         ret = mi_lttng_writer_write_element_string(writer,
 530                         mi_lttng_element_command_name, command);
 531 end:
 532         return ret;
 533 }
 534
 535 LTTNG_HIDDEN
 536 int mi_lttng_writer_command_close(struct mi_writer *writer)
 537 {
 538         return mi_lttng_writer_close_element(writer);
 539 }
 540
 541 LTTNG_HIDDEN
 542 int mi_lttng_writer_open_element(struct mi_writer *writer,
 543                 const char *element_name)
 544 {
 545         return config_writer_open_element(writer->writer, element_name);
 546 }
 547
 548 LTTNG_HIDDEN
 549 int mi_lttng_writer_close_element(struct mi_writer *writer)
 550 {
 551         return config_writer_close_element(writer->writer);
 552 }
 553
 554 LTTNG_HIDDEN
 555 int mi_lttng_close_multi_element(struct mi_writer *writer,
 556                 unsigned int nb_element)
 557 {
 558         int ret, i;
 559
 560         if (nb_element < 1) {
 561                 ret = 0;
 562                 goto end;
 563         }
 564         for (i = 0; i < nb_element; i++) {
 565                 ret = mi_lttng_writer_close_element(writer);
 566                 if (ret) {
 567                         goto end;
 568                 }
 569         }
 570 end:
 571         return ret;
 572 }
 573
 574 LTTNG_HIDDEN
 575 int mi_lttng_writer_write_element_unsigned_int(struct mi_writer *writer,
 576                 const char *element_name, uint64_t value)
 577 {
 578         return config_writer_write_element_unsigned_int(writer->writer,
 579                         element_name, value);
 580 }
 581
 582 LTTNG_HIDDEN
 583 int mi_lttng_writer_write_element_signed_int(struct mi_writer *writer,
 584                 const char *element_name, int64_t value)
 585 {
 586         return config_writer_write_element_signed_int(writer->writer,
 587                         element_name, value);
 588 }
 589
 590 LTTNG_HIDDEN
 591 int mi_lttng_writer_write_element_bool(struct mi_writer *writer,
 592                 const char *element_name, int value)
 593 {
 594         return config_writer_write_element_bool(writer->writer,
 595                         element_name, value);
 596 }
 597
 598 LTTNG_HIDDEN
 599 int mi_lttng_writer_write_element_string(struct mi_writer *writer,
 600                 const char *element_name, const char *value)
 601 {
 602         return config_writer_write_element_string(writer->writer,
 603                         element_name, value);
 604 }
 605
 606 LTTNG_HIDDEN
 607 int mi_lttng_version(struct mi_writer *writer, struct mi_lttng_version *version,
 608         const char *lttng_description, const char *lttng_license)
 609 {
 610         int ret;
 611
 612         /* Open version */
 613         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_version);
 614         if (ret) {
 615                 goto end;
 616         }
 617
 618         /* Version string (contain info like rc etc.) */
 619         ret = mi_lttng_writer_write_element_string(writer,
 620                         mi_lttng_element_version_str, version->version);
 621         if (ret) {
 622                 goto end;
 623         }
 624
 625         /* Major version number */
 626         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 627                         mi_lttng_element_version_major, version->version_major);
 628         if (ret) {
 629                 goto end;
 630         }
 631
 632         /* Minor version number */
 633         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 634                         mi_lttng_element_version_minor, version->version_minor);
 635         if (ret) {
 636                 goto end;
 637         }
 638
 639         /* Commit version number */
 640         ret = mi_lttng_writer_write_element_string(writer,
 641                         mi_lttng_element_version_commit, version->version_commit);
 642         if (ret) {
 643                 goto end;
 644         }
 645
 646         /* Patch number */
 647         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 648                         mi_lttng_element_version_patch_level, version->version_patchlevel);
 649         if (ret) {
 650                 goto end;
 651         }
 652
 653         /* Name of the version */
 654         ret = mi_lttng_writer_write_element_string(writer,
 655                         config_element_name, version->version_name);
 656         if (ret) {
 657                 goto end;
 658         }
 659
 660         /* Description mostly related to beer... */
 661         ret = mi_lttng_writer_write_element_string(writer,
 662                         mi_lttng_element_version_description, lttng_description);
 663         if (ret) {
 664                 goto end;
 665         }
 666
 667         /* url */
 668         ret = mi_lttng_writer_write_element_string(writer,
 669                         mi_lttng_element_version_web, version->package_url);
 670         if (ret) {
 671                 goto end;
 672         }
 673
 674         /* License: free as in free beer...no...*speech* */
 675         ret = mi_lttng_writer_write_element_string(writer,
 676                         mi_lttng_element_version_license, lttng_license);
 677         if (ret) {
 678                 goto end;
 679         }
 680
 681         /* Close version element */
 682         ret = mi_lttng_writer_close_element(writer);
 683
 684 end:
 685         return ret;
 686 }
 687
 688 LTTNG_HIDDEN
 689 int mi_lttng_sessions_open(struct mi_writer *writer)
 690 {
 691         return mi_lttng_writer_open_element(writer, config_element_sessions);
 692 }
 693
 694 LTTNG_HIDDEN
 695 int mi_lttng_session(struct mi_writer *writer,
 696                 struct lttng_session *session, int is_open)
 697 {
 698         int ret;
 699
 700         assert(session);
 701
 702         /* Open sessions element */
 703         ret = mi_lttng_writer_open_element(writer,
 704                         config_element_session);
 705         if (ret) {
 706                 goto end;
 707         }
 708
 709         /* Name of the session */
 710         ret = mi_lttng_writer_write_element_string(writer,
 711                         config_element_name, session->name);
 712         if (ret) {
 713                 goto end;
 714         }
 715
 716         /* Path */
 717         ret = mi_lttng_writer_write_element_string(writer,
 718                         config_element_path, session->path);
 719         if (ret) {
 720                 goto end;
 721         }
 722
 723         /* Enabled ? */
 724         ret = mi_lttng_writer_write_element_bool(writer,
 725                         config_element_enabled, session->enabled);
 726         if (ret) {
 727                 goto end;
 728         }
 729
 730         /* Snapshot mode */
 731         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 732                         config_element_snapshot_mode, session->snapshot_mode);
 733         if (ret) {
 734                 goto end;
 735         }
 736
 737         /* Live timer interval in usec */
 738         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 739                         config_element_live_timer_interval,
 740                         session->live_timer_interval);
 741         if (ret) {
 742                 goto end;
 743         }
 744
 745         if (!is_open) {
 746                 /* Closing session element */
 747                 ret = mi_lttng_writer_close_element(writer);
 748         }
 749 end:
 750         return ret;
 751
 752 }
 753
 754 LTTNG_HIDDEN
 755 int mi_lttng_domains_open(struct mi_writer *writer)
 756 {
 757         return mi_lttng_writer_open_element(writer, config_element_domains);
 758 }
 759
 760 LTTNG_HIDDEN
 761 int mi_lttng_domain(struct mi_writer *writer,
 762                 struct lttng_domain *domain, int is_open)
 763 {
 764         int ret = 0;
 765         const char *str_domain;
 766         const char *str_buffer;
 767
 768         assert(domain);
 769
 770         /* Open domain element */
 771         ret = mi_lttng_writer_open_element(writer, config_element_domain);
 772         if (ret) {
 773                 goto end;
 774         }
 775
 776         /* Domain Type */
 777         str_domain = mi_lttng_domaintype_string(domain->type);
 778         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
 779                         str_domain);
 780         if (ret) {
 781                 goto end;
 782         }
 783
 784         /* Buffer Type */
 785         str_buffer= mi_lttng_buffertype_string(domain->buf_type);
 786         ret = mi_lttng_writer_write_element_string(writer,
 787                         config_element_buffer_type, str_buffer);
 788         if (ret) {
 789                 goto end;
 790         }
 791
 792         /* TODO: union  attr
 793          * This union is not currently used and was added for
 794          * future ust domain support.
 795          * Date: 25-06-2014
 796          * */
 797
 798         if (!is_open) {
 799                 /* Closing domain element */
 800                 ret = mi_lttng_writer_close_element(writer);
 801         }
 802
 803 end:
 804         return ret;
 805
 806 }
 807
 808 LTTNG_HIDDEN
 809 int mi_lttng_channels_open(struct mi_writer *writer)
 810 {
 811         return mi_lttng_writer_open_element(writer, config_element_channels);
 812 }
 813
 814 LTTNG_HIDDEN
 815 int mi_lttng_channel(struct mi_writer *writer,
 816                 struct lttng_channel *channel, int is_open)
 817 {
 818         int ret = 0;
 819
 820         assert(channel);
 821
 822         /* Opening channel element */
 823         ret = mi_lttng_writer_open_element(writer, config_element_channel);
 824         if (ret) {
 825                 goto end;
 826         }
 827
 828         /* Name */
 829         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
 830                         channel->name);
 831         if (ret) {
 832                 goto end;
 833         }
 834
 835         /* Enabled ? */
 836         ret = mi_lttng_writer_write_element_bool(writer,
 837                         config_element_enabled, channel->enabled);
 838         if (ret) {
 839                 goto end;
 840         }
 841
 842         /* Attribute */
 843         ret = mi_lttng_channel_attr(writer, &channel->attr);
 844         if (ret) {
 845                 goto end;
 846         }
 847
 848         if (!is_open) {
 849                 /* Closing channel element */
 850                 ret = mi_lttng_writer_close_element(writer);
 851                 if (ret) {
 852                         goto end;
 853                 }
 854         }
 855 end:
 856         return ret;
 857 }
 858
 859 LTTNG_HIDDEN
 860 int mi_lttng_channel_attr(struct mi_writer *writer,
 861                 struct lttng_channel_attr *attr)
 862 {
 863         int ret = 0;
 864         struct lttng_channel *chan = caa_container_of(attr,
 865                         struct lttng_channel, attr);
 866         uint64_t discarded_events, lost_packets, monitor_timer_interval;
 867         int64_t blocking_timeout;
 868
 869         assert(attr);
 870
 871         ret = lttng_channel_get_discarded_event_count(chan, &discarded_events);
 872         if (ret) {
 873                 goto end;
 874         }
 875
 876         ret = lttng_channel_get_lost_packet_count(chan, &lost_packets);
 877         if (ret) {
 878                 goto end;
 879         }
 880
 881         ret = lttng_channel_get_monitor_timer_interval(chan,
 882                         &monitor_timer_interval);
 883         if (ret) {
 884                 goto end;
 885         }
 886
 887         ret = lttng_channel_get_blocking_timeout(chan,
 888                         &blocking_timeout);
 889         if (ret) {
 890                 goto end;
 891         }
 892
 893         /* Opening Attributes */
 894         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
 895         if (ret) {
 896                 goto end;
 897         }
 898
 899         /* Overwrite */
 900         ret = mi_lttng_writer_write_element_string(writer,
 901                 config_element_overwrite_mode,
 902                 attr->overwrite ? config_overwrite_mode_overwrite :
 903                         config_overwrite_mode_discard);
 904         if (ret) {
 905                 goto end;
 906         }
 907
 908         /* Sub buffer size in byte */
 909         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 910                 config_element_subbuf_size, attr->subbuf_size);
 911         if (ret) {
 912                 goto end;
 913         }
 914
 915         /* Number of subbuffer (power of two) */
 916         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 917                 config_element_num_subbuf,
 918                 attr->num_subbuf);
 919         if (ret) {
 920                 goto end;
 921         }
 922
 923         /* Switch timer interval in usec */
 924         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 925                 config_element_switch_timer_interval,
 926                 attr->switch_timer_interval);
 927         if (ret) {
 928                 goto end;
 929         }
 930
 931         /* Read timer interval in usec */
 932         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 933                 config_element_read_timer_interval,
 934                 attr->read_timer_interval);
 935         if (ret) {
 936                 goto end;
 937         }
 938
 939         /* Monitor timer interval in usec */
 940         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 941                 config_element_monitor_timer_interval,
 942                 monitor_timer_interval);
 943         if (ret) {
 944                 goto end;
 945         }
 946
 947         /* Retry timeout in usec */
 948         ret = mi_lttng_writer_write_element_signed_int(writer,
 949                 config_element_blocking_timeout,
 950                 blocking_timeout);
 951         if (ret) {
 952                 goto end;
 953         }
 954
 955         /* Event output */
 956         ret = mi_lttng_writer_write_element_string(writer,
 957                 config_element_output_type,
 958                 attr->output == LTTNG_EVENT_SPLICE ?
 959                 config_output_type_splice : config_output_type_mmap);
 960         if (ret) {
 961                 goto end;
 962         }
 963
 964         /* Tracefile size in bytes */
 965         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 966                 config_element_tracefile_size, attr->tracefile_size);
 967         if (ret) {
 968                 goto end;
 969         }
 970
 971         /* Count of tracefiles */
 972         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 973                 config_element_tracefile_count,
 974                 attr->tracefile_count);
 975         if (ret) {
 976                 goto end;
 977         }
 978
 979         /* Live timer interval in usec*/
 980         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 981                 config_element_live_timer_interval,
 982                 attr->live_timer_interval);
 983         if (ret) {
 984                 goto end;
 985         }
 986
 987         /* Discarded events */
 988         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 989                 config_element_discarded_events,
 990                 discarded_events);
 991         if (ret) {
 992                 goto end;
 993         }
 994
 995         /* Lost packets */
 996         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 997                 config_element_lost_packets,
 998                 lost_packets);
 999         if (ret) {
1000                 goto end;
1001         }
1002
1003         /* Closing attributes */
1004         ret = mi_lttng_writer_close_element(writer);
1005         if (ret) {
1006                 goto end;
1007         }
1008 end:
1009         return ret;
1010
1011 }
1012
1013 LTTNG_HIDDEN
1014 int mi_lttng_event_common_attributes(struct mi_writer *writer,
1015                 struct lttng_event *event)
1016 {
1017         int ret;
1018         const char *filter_expression;
1019
1020         /* Open event element */
1021         ret = mi_lttng_writer_open_element(writer, config_element_event);
1022         if (ret) {
1023                 goto end;
1024         }
1025
1026         /* Event name */
1027         ret = mi_lttng_writer_write_element_string(writer,
1028                         config_element_name, event->name);
1029         if (ret) {
1030                 goto end;
1031         }
1032
1033         /* Event type */
1034         ret = mi_lttng_writer_write_element_string(writer,
1035                         config_element_type, mi_lttng_eventtype_string(event->type));
1036         if (ret) {
1037                 goto end;
1038         }
1039
1040         /* Is event enabled */
1041         ret = mi_lttng_writer_write_element_bool(writer,
1042                         config_element_enabled, event->enabled);
1043         if (ret) {
1044                 goto end;
1045         }
1046
1047         /* Event filter expression */
1048         ret = lttng_event_get_filter_expression(event, &filter_expression);
1049         if (ret) {
1050                 goto end;
1051         }
1052
1053         if (filter_expression) {
1054                 ret = mi_lttng_writer_write_element_string(writer,
1055                                 config_element_filter_expression,
1056                                 filter_expression);
1057                 if (ret) {
1058                         goto end;
1059                 }
1060         }
1061
1062 end:
1063         return ret;
1064 }
1065
1066 static int write_event_exclusions(struct mi_writer *writer,
1067                 struct lttng_event *event)
1068 {
1069         int i;
1070         int ret;
1071         int exclusion_count;
1072
1073         /* Open event exclusions */
1074         ret = mi_lttng_writer_open_element(writer, config_element_exclusions);
1075         if (ret) {
1076                 goto end;
1077         }
1078
1079         exclusion_count = lttng_event_get_exclusion_name_count(event);
1080         if (exclusion_count < 0) {
1081                 ret = exclusion_count;
1082                 goto end;
1083         }
1084
1085         for (i = 0; i < exclusion_count; i++) {
1086                 const char *name;
1087
1088                 ret = lttng_event_get_exclusion_name(event, i, &name);
1089                 if (ret) {
1090                         /* Close exclusions */
1091                         mi_lttng_writer_close_element(writer);
1092                         goto end;
1093                 }
1094
1095                 ret = mi_lttng_writer_write_element_string(writer,
1096                                 config_element_exclusion, name);
1097                 if (ret) {
1098                         /* Close exclusions */
1099                         mi_lttng_writer_close_element(writer);
1100                         goto end;
1101                 }
1102         }
1103
1104         /* Close exclusions */
1105         ret = mi_lttng_writer_close_element(writer);
1106
1107 end:
1108         return ret;
1109 }
1110
1111 LTTNG_HIDDEN
1112 int mi_lttng_event_tracepoint_loglevel(struct mi_writer *writer,
1113                 struct lttng_event *event, enum lttng_domain_type domain)
1114 {
1115         int ret;
1116
1117         /* Event loglevel */
1118         ret = mi_lttng_writer_write_element_string(writer,
1119                         config_element_loglevel,
1120                         mi_lttng_loglevel_string(event->loglevel, domain));
1121         if (ret) {
1122                 goto end;
1123         }
1124
1125         /* Log level type */
1126         ret = mi_lttng_writer_write_element_string(writer,
1127                         config_element_loglevel_type,
1128                         mi_lttng_logleveltype_string(event->loglevel_type));
1129         if (ret) {
1130                 goto end;
1131         }
1132
1133         /* Event exclusions */
1134         ret = write_event_exclusions(writer, event);
1135
1136 end:
1137         return ret;
1138 }
1139
1140 LTTNG_HIDDEN
1141 int mi_lttng_event_tracepoint_no_loglevel(struct mi_writer *writer,
1142                 struct lttng_event *event)
1143 {
1144         /* event exclusion filter */
1145         return write_event_exclusions(writer, event);
1146 }
1147
1148 LTTNG_HIDDEN
1149 int mi_lttng_event_function_probe(struct mi_writer *writer,
1150                 struct lttng_event *event)
1151 {
1152         int ret;
1153
1154         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1155         if (ret) {
1156                 goto end;
1157         }
1158
1159         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1160         if (ret) {
1161                 goto end;
1162         }
1163
1164         if (event->attr.probe.addr != 0) {
1165                 /* event probe address */
1166                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1167                                 config_element_address, event->attr.probe.addr);
1168                 if (ret) {
1169                         goto end;
1170                 }
1171         } else {
1172                 /* event probe offset */
1173                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1174                                 config_element_offset, event->attr.probe.offset);
1175                 if (ret) {
1176                         goto end;
1177                 }
1178
1179                 /* event probe symbol_name */
1180                 ret = mi_lttng_writer_write_element_string(writer,
1181                                 config_element_symbol_name, event->attr.probe.symbol_name);
1182                 if (ret) {
1183                         goto end;
1184                 }
1185         }
1186
1187         /* Close probe_attributes and attributes */
1188         ret = mi_lttng_close_multi_element(writer, 2);
1189 end:
1190         return ret;
1191 }
1192
1193 LTTNG_HIDDEN
1194 int mi_lttng_event_function_entry(struct mi_writer *writer,
1195                 struct lttng_event *event)
1196 {
1197         int ret;
1198
1199         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1200         if (ret) {
1201                 goto end;
1202         }
1203
1204         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1205         if (ret) {
1206                 goto end;
1207         }
1208
1209         /* event probe symbol_name */
1210         ret = mi_lttng_writer_write_element_string(writer,
1211                         config_element_symbol_name, event->attr.ftrace.symbol_name);
1212         if (ret) {
1213                 goto end;
1214         }
1215
1216         /* Close function_attributes and attributes */
1217         ret = mi_lttng_close_multi_element(writer, 2);
1218 end:
1219         return ret;
1220 }
1221
1222 LTTNG_HIDDEN
1223 int mi_lttng_events_open(struct mi_writer *writer)
1224 {
1225         return mi_lttng_writer_open_element(writer, config_element_events);
1226 }
1227
1228 LTTNG_HIDDEN
1229 int mi_lttng_event(struct mi_writer *writer,
1230                 struct lttng_event *event, int is_open, enum lttng_domain_type domain)
1231 {
1232         int ret;
1233
1234         ret = mi_lttng_event_common_attributes(writer, event);
1235         if (ret) {
1236                 goto end;
1237         }
1238
1239         switch (event->type) {
1240         case LTTNG_EVENT_TRACEPOINT:
1241         {
1242                 if (event->loglevel != -1) {
1243                         ret = mi_lttng_event_tracepoint_loglevel(writer, event, domain);
1244                 } else {
1245                         ret = mi_lttng_event_tracepoint_no_loglevel(writer, event);
1246                 }
1247                 break;
1248         }
1249         case LTTNG_EVENT_FUNCTION:
1250                 /* Fallthrough */
1251         case LTTNG_EVENT_PROBE:
1252                 ret = mi_lttng_event_function_probe(writer, event);
1253                 break;
1254         case LTTNG_EVENT_FUNCTION_ENTRY:
1255                 ret = mi_lttng_event_function_entry(writer, event);
1256                 break;
1257         case LTTNG_EVENT_ALL:
1258                 /* Fallthrough */
1259         default:
1260                 break;
1261         }
1262
1263         if (!is_open) {
1264                 ret = mi_lttng_writer_close_element(writer);
1265         }
1266
1267 end:
1268         return ret;
1269 }
1270
1271 LTTNG_HIDDEN
1272 int mi_lttng_trackers_open(struct mi_writer *writer)
1273 {
1274         return mi_lttng_writer_open_element(writer, config_element_trackers);
1275 }
1276
1277 LTTNG_HIDDEN
1278 int mi_lttng_pid_tracker_open(struct mi_writer *writer)
1279 {
1280         int ret;
1281
1282         /* Open element pid_tracker */
1283         ret = mi_lttng_writer_open_element(writer, config_element_pid_tracker);
1284         if (ret) {
1285                 goto end;
1286         }
1287
1288         /* Open targets element */
1289         ret = mi_lttng_targets_open(writer);
1290 end:
1291         return ret;
1292 }
1293
1294 LTTNG_HIDDEN
1295 int mi_lttng_pids_open(struct mi_writer *writer)
1296 {
1297         return mi_lttng_writer_open_element(writer, config_element_pids);
1298 }
1299
1300 /*
1301  * TODO: move the listing of pid for user agent to process semantic on
1302  * mi api bump. The use of process element break the mi api.
1303  */
1304 LTTNG_HIDDEN
1305 int mi_lttng_pid(struct mi_writer *writer, pid_t pid , const char *name,
1306                 int is_open)
1307 {
1308         int ret;
1309
1310         /* Open pid process */
1311         ret = mi_lttng_writer_open_element(writer, config_element_pid);
1312         if (ret) {
1313                 goto end;
1314         }
1315
1316         /* Writing pid number */
1317         ret = mi_lttng_writer_write_element_signed_int(writer,
1318                         mi_lttng_element_pid_id, (int)pid);
1319         if (ret) {
1320                 goto end;
1321         }
1322
1323         /* Writing name of the process */
1324         if (name) {
1325                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1326                                 name);
1327                 if (ret) {
1328                         goto end;
1329                 }
1330         }
1331
1332         if (!is_open) {
1333                 /* Closing Pid */
1334                 ret = mi_lttng_writer_close_element(writer);
1335         }
1336
1337 end:
1338         return ret;
1339 }
1340
1341 LTTNG_HIDDEN
1342 int mi_lttng_targets_open(struct mi_writer *writer)
1343 {
1344         return mi_lttng_writer_open_element(writer,
1345                         config_element_targets);
1346 }
1347
1348 LTTNG_HIDDEN
1349 int mi_lttng_pid_target(struct mi_writer *writer, pid_t pid, int is_open)
1350 {
1351         int ret;
1352
1353         ret = mi_lttng_writer_open_element(writer,
1354                         config_element_target_pid);
1355         if (ret) {
1356                 goto end;
1357         }
1358
1359         /* Writing pid number
1360          * Special case for element all on track untrack command
1361          * All pid is represented as wildcard *
1362          */
1363         if ((int) pid == -1) {
1364                 ret = mi_lttng_writer_write_element_string(writer,
1365                                 config_element_pid,
1366                                 mi_lttng_element_track_untrack_all_wildcard);
1367         } else {
1368                 ret = mi_lttng_writer_write_element_signed_int(writer,
1369                                 config_element_pid, (int) pid);
1370         }
1371         if (ret) {
1372                 goto end;
1373         }
1374
1375         if (!is_open) {
1376                 ret = mi_lttng_writer_close_element(writer);
1377                 if (ret) {
1378                         goto end;
1379                 }
1380         }
1381
1382 end:
1383         return ret;
1384 }
1385
1386 LTTNG_HIDDEN
1387 int mi_lttng_event_fields_open(struct mi_writer *writer)
1388 {
1389         return mi_lttng_writer_open_element(writer, mi_lttng_element_event_fields);
1390 }
1391
1392 LTTNG_HIDDEN
1393 int mi_lttng_event_field(struct mi_writer *writer,
1394                 struct lttng_event_field *field)
1395 {
1396         int ret;
1397
1398         if (!field->field_name[0]) {
1399                 ret = 0;
1400                 goto end;
1401         }
1402
1403         /* Open field */
1404         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_event_field);
1405         if (ret) {
1406                 goto end;
1407         }
1408
1409         if (!field->field_name[0]) {
1410                 goto close;
1411         }
1412
1413         /* Name */
1414         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1415                         field->field_name);
1416         if (ret) {
1417                 goto end;
1418         }
1419
1420         /* Type */
1421         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1422                         mi_lttng_eventfieldtype_string(field->type));
1423         if (ret) {
1424                 goto end;
1425         }
1426
1427         /* nowrite  */
1428         ret = mi_lttng_writer_write_element_signed_int(writer,
1429                         mi_lttng_element_nowrite, field->nowrite);
1430         if (ret) {
1431                 goto end;
1432         }
1433
1434 close:
1435         /* Close field element */
1436         ret = mi_lttng_writer_close_element(writer);
1437
1438 end:
1439         return ret;
1440 }
1441
1442 LTTNG_HIDDEN
1443 int mi_lttng_perf_counter_context(struct mi_writer *writer,
1444                 struct lttng_event_perf_counter_ctx  *perf_context)
1445 {
1446         int ret;
1447
1448         /* Open perf_counter_context */
1449         ret = mi_lttng_writer_open_element(writer,
1450                         mi_lttng_element_perf_counter_context);
1451         if (ret) {
1452                 goto end;
1453         }
1454
1455         /* Type */
1456         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1457                         config_element_type, perf_context->type);
1458         if (ret) {
1459                 goto end;
1460         }
1461
1462         /* Config */
1463         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1464                         config_element_config, perf_context->config);
1465         if (ret) {
1466                 goto end;
1467         }
1468
1469         /* Name of the perf counter */
1470         ret = mi_lttng_writer_write_element_string(writer,
1471                         config_element_name, perf_context->name);
1472         if (ret) {
1473                 goto end;
1474         }
1475
1476         /* Close perf_counter_context */
1477         ret = mi_lttng_writer_close_element(writer);
1478 end:
1479         return ret;
1480 }
1481
1482 static
1483 int mi_lttng_app_context(struct mi_writer *writer,
1484                 const char *provider_name, const char *ctx_name)
1485 {
1486         int ret;
1487
1488         /* Open app */
1489         ret = mi_lttng_writer_open_element(writer,
1490                         config_element_context_app);
1491         if (ret) {
1492                 goto end;
1493         }
1494
1495         /* provider_name */
1496         ret = mi_lttng_writer_write_element_string(writer,
1497                         config_element_context_app_provider_name,
1498                         provider_name);
1499         if (ret) {
1500                 goto end;
1501         }
1502
1503         /* ctx_name */
1504         ret = mi_lttng_writer_write_element_string(writer,
1505                         config_element_context_app_ctx_name, ctx_name);
1506         if (ret) {
1507                 goto end;
1508         }
1509
1510         /* Close app */
1511         ret = mi_lttng_writer_close_element(writer);
1512 end:
1513         return ret;
1514 }
1515
1516 LTTNG_HIDDEN
1517 int mi_lttng_context(struct mi_writer *writer,
1518                 struct lttng_event_context *context, int is_open)
1519 {
1520         int ret;
1521
1522         /* Open context */
1523         ret = mi_lttng_writer_open_element(writer , config_element_context);
1524         if (ret) {
1525                 goto end;
1526         }
1527
1528         /* Special case for PERF_*_COUNTER
1529          * print the lttng_event_perf_counter_ctx*/
1530         switch (context->ctx) {
1531         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
1532         case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
1533         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
1534         {
1535                 struct lttng_event_perf_counter_ctx *perf_context =
1536                                 &context->u.perf_counter;
1537                 ret =  mi_lttng_perf_counter_context(writer, perf_context);
1538                 if (ret) {
1539                         goto end;
1540                 }
1541                 break;
1542         }
1543         case LTTNG_EVENT_CONTEXT_APP_CONTEXT:
1544         {
1545                 ret = mi_lttng_app_context(writer,
1546                                 context->u.app_ctx.provider_name,
1547                                 context->u.app_ctx.ctx_name);
1548                 if (ret) {
1549                         goto end;
1550                 }
1551                 break;
1552         }
1553         default:
1554         {
1555                 const char *type_string = mi_lttng_event_contexttype_string(
1556                                 context->ctx);
1557                 if (!type_string) {
1558                         ret = -LTTNG_ERR_INVALID;
1559                         goto end;
1560                 }
1561
1562                 /* Print context type */
1563                 ret = mi_lttng_writer_write_element_string(writer,
1564                                 config_element_type, type_string);
1565                 break;
1566         }
1567         }
1568
1569         /* Close context */
1570         if (!is_open) {
1571                 ret = mi_lttng_writer_close_element(writer);
1572         }
1573
1574 end:
1575         return ret;
1576 }
1577
1578 LTTNG_HIDDEN
1579 int mi_lttng_snapshot_output_session_name(struct mi_writer *writer,
1580                 const char *session_name)
1581 {
1582         int ret;
1583
1584         /* Open session element */
1585         ret = mi_lttng_writer_open_element(writer, config_element_session);
1586         if (ret) {
1587                 goto end;
1588         }
1589
1590         /* Snapshot output list for current session name */
1591         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1592                         session_name);
1593         if (ret) {
1594                 goto end;
1595         }
1596
1597         /* Open element snapshots (sequence one snapshot) */
1598         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_snapshots);
1599         if (ret) {
1600                 goto end;
1601         }
1602
1603 end:
1604         return ret;
1605 }
1606
1607 LTTNG_HIDDEN
1608 int mi_lttng_snapshot_list_output(struct mi_writer *writer,
1609                 struct lttng_snapshot_output *output)
1610 {
1611         int ret;
1612
1613         /* Open element snapshot output */
1614         ret = mi_lttng_writer_open_element(writer,
1615                         mi_lttng_element_command_snapshot);
1616         if (ret) {
1617                 goto end;
1618         }
1619
1620         /* ID of the snapshot output */
1621         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1622                         mi_lttng_element_id, output->id);
1623         if (ret) {
1624                 goto end;
1625         }
1626
1627         /* Name of the output */
1628         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1629                         output->name);
1630         if (ret) {
1631                 goto end;
1632         }
1633
1634         /* Destination of the output (ctrl_url)*/
1635         ret = mi_lttng_writer_write_element_string(writer,
1636                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1637         if (ret) {
1638                 goto end;
1639         }
1640
1641         /* Destination of the output (data_url) */
1642         ret = mi_lttng_writer_write_element_string(writer,
1643                         mi_lttng_element_snapshot_data_url, output->data_url);
1644         if (ret) {
1645                 goto end;
1646         }
1647
1648         /* total size of all stream combined */
1649         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1650                         mi_lttng_element_snapshot_max_size, output->max_size);
1651         if (ret) {
1652                 goto end;
1653         }
1654
1655         /* Close snapshot output element */
1656         ret = mi_lttng_writer_close_element(writer);
1657
1658 end:
1659         return ret;
1660 }
1661
1662 LTTNG_HIDDEN
1663 int mi_lttng_snapshot_del_output(struct mi_writer *writer, int id,
1664                 const char *name, const char *current_session_name)
1665 {
1666         int ret;
1667
1668         /* Open element del_snapshot */
1669         ret = mi_lttng_writer_open_element(writer,
1670                         mi_lttng_element_command_snapshot);
1671         if (ret) {
1672                 goto end;
1673         }
1674
1675
1676         if (id != UINT32_MAX) {
1677                 /* "Snapshot output "id" successfully deleted
1678                  * for "current_session_name"
1679                  * ID of the snapshot output
1680                  */
1681                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1682                                 mi_lttng_element_id, id);
1683                 if (ret) {
1684                         goto end;
1685                 }
1686         } else {
1687                 /* "Snapshot output "name" successfully deleted
1688                  * for session "current_session_name"
1689                  * Name of the output
1690                  */
1691                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1692                                 name);
1693                 if (ret) {
1694                         goto end;
1695                 }
1696         }
1697
1698         /* Snapshot was deleted for session "current_session_name"*/
1699         ret = mi_lttng_writer_write_element_string(writer,
1700                         mi_lttng_element_snapshot_session_name,
1701                         current_session_name);
1702         if (ret) {
1703                 goto end;
1704         }
1705
1706         /* Close snapshot element */
1707         ret = mi_lttng_writer_close_element(writer);
1708
1709 end:
1710         return ret;
1711 }
1712
1713 LTTNG_HIDDEN
1714 int mi_lttng_snapshot_add_output(struct mi_writer *writer,
1715                 const char *current_session_name, const char *n_ptr,
1716                 struct lttng_snapshot_output *output)
1717 {
1718         int ret;
1719
1720         /* Open element snapshot */
1721         ret = mi_lttng_writer_open_element(writer,
1722                         mi_lttng_element_command_snapshot);
1723         if (ret) {
1724                 goto end;
1725         }
1726
1727         /* Snapshot output id */
1728         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1729                         mi_lttng_element_id, output->id);
1730         if (ret) {
1731                 goto end;
1732         }
1733
1734         /* Snapshot output names */
1735         ret = mi_lttng_writer_write_element_string(writer,
1736                         config_element_name, n_ptr);
1737         if (ret) {
1738                 goto end;
1739         }
1740
1741         /* Destination of the output (ctrl_url)*/
1742         ret = mi_lttng_writer_write_element_string(writer,
1743                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1744         if (ret) {
1745                 goto end;
1746         }
1747
1748         /* Snapshot added for session "current_session_name"*/
1749         ret = mi_lttng_writer_write_element_string(writer,
1750                         mi_lttng_element_snapshot_session_name, current_session_name);
1751         if (ret) {
1752                 goto end;
1753         }
1754
1755         /* total size of all stream combined */
1756         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1757                         mi_lttng_element_snapshot_max_size, output->max_size);
1758         if (ret) {
1759                 goto end;
1760         }
1761
1762         /* Close snapshot element */
1763         ret = mi_lttng_writer_close_element(writer);
1764
1765 end:
1766         return ret;
1767 }
1768
1769 LTTNG_HIDDEN
1770 int mi_lttng_snapshot_record(struct mi_writer *writer,
1771                 const char *current_session_name, const char *url,
1772                 const char *cmdline_ctrl_url, const char *cmdline_data_url)
1773 {
1774         int ret;
1775
1776         /* Open element snapshot */
1777         ret = mi_lttng_writer_open_element(writer,
1778                         mi_lttng_element_command_snapshot);
1779         if (ret) {
1780                 goto end;
1781         }
1782
1783         /*
1784          * If a valid an URL was given, serialize it,
1785          * else take the command line data and ctrl urls*/
1786         if (url) {
1787                 /* Destination of the output (ctrl_url)*/
1788                 ret = mi_lttng_writer_write_element_string(writer,
1789                                 mi_lttng_element_snapshot_ctrl_url, url);
1790                 if (ret) {
1791                         goto end;
1792                 }
1793         } else if (cmdline_ctrl_url) {
1794                 /* Destination of the output (ctrl_url)*/
1795                 ret = mi_lttng_writer_write_element_string(writer,
1796                                 mi_lttng_element_snapshot_ctrl_url, cmdline_ctrl_url);
1797                 if (ret) {
1798                         goto end;
1799                 }
1800
1801                 /* Destination of the output (data_url) */
1802                 ret = mi_lttng_writer_write_element_string(writer,
1803                                 mi_lttng_element_snapshot_data_url, cmdline_data_url);
1804                 if (ret) {
1805                         goto end;
1806                 }
1807         }
1808
1809         /* Close record_snapshot element */
1810         ret = mi_lttng_writer_close_element(writer);
1811
1812 end:
1813         return ret;
1814 }