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 const char * const mi_lttng_xmlns = "xmlns";
  34 const char * const mi_lttng_xmlns_xsi = "xmlns:xsi";
  35 const char * const mi_lttng_w3_schema_uri = "http://www.w3.org/2001/XMLSchema-instance";
  36 const char * const mi_lttng_schema_location = "xsi:schemaLocation";
  37 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 const char * const mi_lttng_schema_version = "schemaVersion";
  43 const char * const mi_lttng_schema_version_value = XSTR(MI_SCHEMA_MAJOR_VERSION)
  44         "." XSTR(MI_SCHEMA_MINOR_VERSION);
  45
  46 /* Strings related to command */
  47 const char * const mi_lttng_element_command = "command";
  48 const char * const mi_lttng_element_command_action = "snapshot_action";
  49 const char * const mi_lttng_element_command_add_context = "add-context";
  50 const char * const mi_lttng_element_command_calibrate = "calibrate";
  51 const char * const mi_lttng_element_command_create = "create";
  52 const char * const mi_lttng_element_command_destroy = "destroy";
  53 const char * const mi_lttng_element_command_disable_channel = "disable-channel";
  54 const char * const mi_lttng_element_command_disable_event = "disable-event";
  55 const char * const mi_lttng_element_command_enable_channels = "enable-channel";
  56 const char * const mi_lttng_element_command_enable_event = "enable-event";
  57 const char * const mi_lttng_element_command_list = "list";
  58 const char * const mi_lttng_element_command_load = "load";
  59 const char * const mi_lttng_element_command_name = "name";
  60 const char * const mi_lttng_element_command_output = "output";
  61 const char * const mi_lttng_element_command_save = "save";
  62 const char * const mi_lttng_element_command_set_session = "set-session";
  63 const char * const mi_lttng_element_command_snapshot = "snapshot";
  64 const char * const mi_lttng_element_command_snapshot_add = "add_snapshot";
  65 const char * const mi_lttng_element_command_snapshot_del = "del_snapshot";
  66 const char * const mi_lttng_element_command_snapshot_list = "list_snapshot";
  67 const char * const mi_lttng_element_command_snapshot_record = "record_snapshot";
  68 const char * const mi_lttng_element_command_start = "start";
  69 const char * const mi_lttng_element_command_stop = "stop";
  70 const char * const mi_lttng_element_command_success = "success";
  71 const char * const mi_lttng_element_command_track = "track";
  72 const char * const mi_lttng_element_command_untrack = "untrack";
  73 const char * const mi_lttng_element_command_version = "version";
  74
  75 /* Strings related to version command */
  76 const char * const mi_lttng_element_version = "version";
  77 const char * const mi_lttng_element_version_commit = "commit";
  78 const char * const mi_lttng_element_version_description = "description";
  79 const char * const mi_lttng_element_version_license = "license";
  80 const char * const mi_lttng_element_version_major = "major";
  81 const char * const mi_lttng_element_version_minor = "minor";
  82 const char * const mi_lttng_element_version_patch_level = "patchLevel";
  83 const char * const mi_lttng_element_version_str = "string";
  84 const char * const mi_lttng_element_version_web = "url";
  85
  86 /* String related to a lttng_event_field */
  87 const char * const mi_lttng_element_event_field = "event_field";
  88 const char * const mi_lttng_element_event_fields = "event_fields";
  89
  90 /* String related to lttng_event_perf_counter_ctx */
  91 const char * const mi_lttng_element_perf_counter_context = "perf";
  92
  93 /* Strings related to pid */
  94 const char * const mi_lttng_element_pid_id = "id";
  95
  96 /* Strings related to save command */
  97 const char * const mi_lttng_element_save = "save";
  98
  99 /* Strings related to load command */
 100 const char * const mi_lttng_element_load = "load";
 101
 102 /* General elements of mi_lttng */
 103 const char * const mi_lttng_element_empty = "";
 104 const char * const mi_lttng_element_id = "id";
 105 const char * const mi_lttng_element_nowrite = "nowrite";
 106 const char * const mi_lttng_element_success = "success";
 107 const char * const mi_lttng_element_type_enum = "ENUM";
 108 const char * const mi_lttng_element_type_float = "FLOAT";
 109 const char * const mi_lttng_element_type_integer = "INTEGER";
 110 const char * const mi_lttng_element_type_other = "OTHER";
 111 const char * const mi_lttng_element_type_string = "STRING";
 112
 113 /* String related to loglevel */
 114 const char * const mi_lttng_loglevel_str_alert = "TRACE_ALERT";
 115 const char * const mi_lttng_loglevel_str_crit = "TRACE_CRIT";
 116 const char * const mi_lttng_loglevel_str_debug = "TRACE_DEBUG";
 117 const char * const mi_lttng_loglevel_str_debug_function = "TRACE_DEBUG_FUNCTION";
 118 const char * const mi_lttng_loglevel_str_debug_line = "TRACE_DEBUG_LINE";
 119 const char * const mi_lttng_loglevel_str_debug_module = "TRACE_DEBUG_MODULE";
 120 const char * const mi_lttng_loglevel_str_debug_process = "TRACE_DEBUG_PROCESS";
 121 const char * const mi_lttng_loglevel_str_debug_program = "TRACE_DEBUG_PROGRAM";
 122 const char * const mi_lttng_loglevel_str_debug_system = "TRACE_DEBUG_SYSTEM";
 123 const char * const mi_lttng_loglevel_str_debug_unit = "TRACE_DEBUG_UNIT";
 124 const char * const mi_lttng_loglevel_str_emerg = "TRACE_EMERG";
 125 const char * const mi_lttng_loglevel_str_err = "TRACE_ERR";
 126 const char * const mi_lttng_loglevel_str_info = "TRACE_INFO";
 127 const char * const mi_lttng_loglevel_str_notice = "TRACE_NOTICE";
 128 const char * const mi_lttng_loglevel_str_unknown = "UNKNOWN";
 129 const char * const mi_lttng_loglevel_str_warning = "TRACE_WARNING";
 130
 131 /* String related to loglevel JUL */
 132 const char * const mi_lttng_loglevel_str_jul_all = "JUL_ALL";
 133 const char * const mi_lttng_loglevel_str_jul_config = "JUL_CONFIG";
 134 const char * const mi_lttng_loglevel_str_jul_fine = "JUL_FINE";
 135 const char * const mi_lttng_loglevel_str_jul_finer = "JUL_FINER";
 136 const char * const mi_lttng_loglevel_str_jul_finest = "JUL_FINEST";
 137 const char * const mi_lttng_loglevel_str_jul_info = "JUL_INFO";
 138 const char * const mi_lttng_loglevel_str_jul_off = "JUL_OFF";
 139 const char * const mi_lttng_loglevel_str_jul_severe = "JUL_SEVERE";
 140 const char * const mi_lttng_loglevel_str_jul_warning = "JUL_WARNING";
 141
 142 /* String related to loglevel LOG4J */
 143 const char * const mi_lttng_loglevel_str_log4j_off = "LOG4J_OFF";
 144 const char * const mi_lttng_loglevel_str_log4j_fatal = "LOG4J_FATAL";
 145 const char * const mi_lttng_loglevel_str_log4j_error = "LOG4J_ERROR";
 146 const char * const mi_lttng_loglevel_str_log4j_warn = "LOG4J_WARN";
 147 const char * const mi_lttng_loglevel_str_log4j_info = "LOG4J_INFO";
 148 const char * const mi_lttng_loglevel_str_log4j_debug = "LOG4J_DEBUG";
 149 const char * const mi_lttng_loglevel_str_log4j_trace = "LOG4J_TRACE";
 150 const char * const mi_lttng_loglevel_str_log4j_all = "LOG4J_ALL";
 151
 152 /* String related to loglevel Python */
 153 const char * const mi_lttng_loglevel_str_python_critical = "PYTHON_CRITICAL";
 154 const char * const mi_lttng_loglevel_str_python_error = "PYTHON_ERROR";
 155 const char * const mi_lttng_loglevel_str_python_warning = "PYTHON_WARNING";
 156 const char * const mi_lttng_loglevel_str_python_info = "PYTHON_INFO";
 157 const char * const mi_lttng_loglevel_str_python_debug = "PYTHON_DEBUG";
 158 const char * const mi_lttng_loglevel_str_python_notset = "PYTHON_NOTSET";
 159
 160 /* String related to loglevel type */
 161 const char * const mi_lttng_loglevel_type_all = "ALL";
 162 const char * const mi_lttng_loglevel_type_range = "RANGE";
 163 const char * const mi_lttng_loglevel_type_single = "SINGLE";
 164 const char * const mi_lttng_loglevel_type_unknown = "UNKNOWN";
 165
 166 /* String related to lttng_calibrate */
 167 const char * const mi_lttng_element_calibrate = "calibrate";
 168 const char * const mi_lttng_element_calibrate_function = "FUNCTION";
 169
 170 /* String related to a lttng_snapshot_output */
 171 const char * const mi_lttng_element_snapshot_ctrl_url = "ctrl_url";
 172 const char * const mi_lttng_element_snapshot_data_url = "data_url";
 173 const char * const mi_lttng_element_snapshot_max_size = "max_size";
 174 const char * const mi_lttng_element_snapshot_n_ptr = "n_ptr";
 175 const char * const mi_lttng_element_snapshot_session_name = "session_name";
 176 const char * const mi_lttng_element_snapshots = "snapshots";
 177
 178 /* String related to track/untrack command */
 179 const char * const mi_lttng_element_track_untrack_all_wildcard = "*";
 180
 181
 182 /* This is a merge of jul loglevel and regular loglevel
 183  * Those should never overlap by definition
 184  * (see struct lttng_event loglevel)
 185  */
 186 LTTNG_HIDDEN
 187 const char *mi_lttng_loglevel_string(int value, enum lttng_domain_type domain)
 188 {
 189         switch (domain) {
 190         case LTTNG_DOMAIN_KERNEL:
 191         case LTTNG_DOMAIN_UST:
 192                 switch (value) {
 193                 case -1:
 194                         return mi_lttng_element_empty;
 195                 case LTTNG_LOGLEVEL_EMERG:
 196                         return mi_lttng_loglevel_str_emerg;
 197                 case LTTNG_LOGLEVEL_ALERT:
 198                         return mi_lttng_loglevel_str_alert;
 199                 case LTTNG_LOGLEVEL_CRIT:
 200                         return mi_lttng_loglevel_str_crit;
 201                 case LTTNG_LOGLEVEL_ERR:
 202                         return mi_lttng_loglevel_str_err;
 203                 case LTTNG_LOGLEVEL_WARNING:
 204                         return mi_lttng_loglevel_str_warning;
 205                 case LTTNG_LOGLEVEL_NOTICE:
 206                         return mi_lttng_loglevel_str_notice;
 207                 case LTTNG_LOGLEVEL_INFO:
 208                         return mi_lttng_loglevel_str_info;
 209                 case LTTNG_LOGLEVEL_DEBUG_SYSTEM:
 210                         return mi_lttng_loglevel_str_debug_system;
 211                 case LTTNG_LOGLEVEL_DEBUG_PROGRAM:
 212                         return mi_lttng_loglevel_str_debug_program;
 213                 case LTTNG_LOGLEVEL_DEBUG_PROCESS:
 214                         return mi_lttng_loglevel_str_debug_process;
 215                 case LTTNG_LOGLEVEL_DEBUG_MODULE:
 216                         return mi_lttng_loglevel_str_debug_module;
 217                 case LTTNG_LOGLEVEL_DEBUG_UNIT:
 218                         return mi_lttng_loglevel_str_debug_unit;
 219                 case LTTNG_LOGLEVEL_DEBUG_FUNCTION:
 220                         return mi_lttng_loglevel_str_debug_function;
 221                 case LTTNG_LOGLEVEL_DEBUG_LINE:
 222                         return mi_lttng_loglevel_str_debug_line;
 223                 case LTTNG_LOGLEVEL_DEBUG:
 224                         return mi_lttng_loglevel_str_debug;
 225                 default:
 226                         return mi_lttng_loglevel_str_unknown;
 227                 }
 228                 break;
 229         case LTTNG_DOMAIN_LOG4J:
 230                 switch (value) {
 231                 case -1:
 232                         return mi_lttng_element_empty;
 233                 case LTTNG_LOGLEVEL_LOG4J_OFF:
 234                         return mi_lttng_loglevel_str_log4j_off;
 235                 case LTTNG_LOGLEVEL_LOG4J_FATAL:
 236                         return mi_lttng_loglevel_str_log4j_fatal;
 237                 case LTTNG_LOGLEVEL_LOG4J_ERROR:
 238                         return mi_lttng_loglevel_str_log4j_error;
 239                 case LTTNG_LOGLEVEL_LOG4J_WARN:
 240                         return mi_lttng_loglevel_str_log4j_warn;
 241                 case LTTNG_LOGLEVEL_LOG4J_INFO:
 242                         return mi_lttng_loglevel_str_log4j_info;
 243                 case LTTNG_LOGLEVEL_LOG4J_DEBUG:
 244                         return mi_lttng_loglevel_str_log4j_debug;
 245                 case LTTNG_LOGLEVEL_LOG4J_TRACE:
 246                         return mi_lttng_loglevel_str_log4j_trace;
 247                 case LTTNG_LOGLEVEL_LOG4J_ALL:
 248                         return mi_lttng_loglevel_str_log4j_all;
 249                 default:
 250                         return mi_lttng_loglevel_str_unknown;
 251                 }
 252                 break;
 253         case LTTNG_DOMAIN_JUL:
 254                 switch (value) {
 255                 case -1:
 256                         return mi_lttng_element_empty;
 257                 case LTTNG_LOGLEVEL_JUL_OFF:
 258                         return mi_lttng_loglevel_str_jul_off;
 259                 case LTTNG_LOGLEVEL_JUL_SEVERE:
 260                         return mi_lttng_loglevel_str_jul_severe;
 261                 case LTTNG_LOGLEVEL_JUL_WARNING:
 262                         return mi_lttng_loglevel_str_jul_warning;
 263                 case LTTNG_LOGLEVEL_JUL_INFO:
 264                         return mi_lttng_loglevel_str_jul_info;
 265                 case LTTNG_LOGLEVEL_JUL_CONFIG:
 266                         return mi_lttng_loglevel_str_jul_config;
 267                 case LTTNG_LOGLEVEL_JUL_FINE:
 268                         return mi_lttng_loglevel_str_jul_fine;
 269                 case LTTNG_LOGLEVEL_JUL_FINER:
 270                         return mi_lttng_loglevel_str_jul_finer;
 271                 case LTTNG_LOGLEVEL_JUL_FINEST:
 272                         return mi_lttng_loglevel_str_jul_finest;
 273                 case LTTNG_LOGLEVEL_JUL_ALL:
 274                         return mi_lttng_loglevel_str_jul_all;
 275                 default:
 276                         return mi_lttng_loglevel_str_unknown;
 277                 }
 278                 break;
 279         case LTTNG_DOMAIN_PYTHON:
 280                 switch (value) {
 281                 case LTTNG_LOGLEVEL_PYTHON_CRITICAL:
 282                         return mi_lttng_loglevel_str_python_critical;
 283                 case LTTNG_LOGLEVEL_PYTHON_ERROR:
 284                         return mi_lttng_loglevel_str_python_error;
 285                 case LTTNG_LOGLEVEL_PYTHON_WARNING:
 286                         return mi_lttng_loglevel_str_python_warning;
 287                 case LTTNG_LOGLEVEL_PYTHON_INFO:
 288                         return mi_lttng_loglevel_str_python_info;
 289                 case LTTNG_LOGLEVEL_PYTHON_DEBUG:
 290                         return mi_lttng_loglevel_str_python_debug;
 291                 case LTTNG_LOGLEVEL_PYTHON_NOTSET:
 292                         return mi_lttng_loglevel_str_python_notset;
 293                 default:
 294                         return mi_lttng_loglevel_str_unknown;
 295                 }
 296                 break;
 297         }
 298
 299         /* Reaching this means the domain is unknown. */
 300         return mi_lttng_loglevel_str_unknown;
 301 }
 302
 303 LTTNG_HIDDEN
 304 const char *mi_lttng_logleveltype_string(enum lttng_loglevel_type value)
 305 {
 306         switch (value) {
 307         case LTTNG_EVENT_LOGLEVEL_ALL:
 308                 return mi_lttng_loglevel_type_all;
 309         case LTTNG_EVENT_LOGLEVEL_RANGE:
 310                 return mi_lttng_loglevel_type_range;
 311         case LTTNG_EVENT_LOGLEVEL_SINGLE:
 312                 return mi_lttng_loglevel_type_single;
 313         default:
 314                 return mi_lttng_loglevel_type_unknown;
 315         }
 316 }
 317
 318 LTTNG_HIDDEN
 319 const char *mi_lttng_eventtype_string(enum lttng_event_type value)
 320 {
 321         switch (value) {
 322         case LTTNG_EVENT_ALL:
 323                 return config_event_type_all;
 324         case LTTNG_EVENT_TRACEPOINT:
 325                 return config_event_type_tracepoint;
 326         case LTTNG_EVENT_PROBE:
 327                 return config_event_type_probe;
 328         case LTTNG_EVENT_FUNCTION:
 329                 return config_event_type_function;
 330         case LTTNG_EVENT_FUNCTION_ENTRY:
 331                 return config_event_type_function_entry;
 332         case LTTNG_EVENT_SYSCALL:
 333                 return config_event_type_syscall;
 334         case LTTNG_EVENT_NOOP:
 335                 return config_event_type_noop;
 336         default:
 337                 return mi_lttng_element_empty;
 338         }
 339 }
 340
 341 static
 342 const char *mi_lttng_event_contexttype_string(enum lttng_event_context_type val)
 343 {
 344         switch (val) {
 345         case LTTNG_EVENT_CONTEXT_PID:
 346                 return config_event_context_pid;
 347         case LTTNG_EVENT_CONTEXT_PROCNAME:
 348                 return config_event_context_procname;
 349         case LTTNG_EVENT_CONTEXT_PRIO:
 350                 return config_event_context_prio;
 351         case LTTNG_EVENT_CONTEXT_NICE:
 352                 return config_event_context_nice;
 353         case LTTNG_EVENT_CONTEXT_VPID:
 354                 return config_event_context_vpid;
 355         case LTTNG_EVENT_CONTEXT_TID:
 356                 return config_event_context_tid;
 357         case LTTNG_EVENT_CONTEXT_VTID:
 358                 return config_event_context_vtid;
 359         case LTTNG_EVENT_CONTEXT_PPID:
 360                 return config_event_context_ppid;
 361         case LTTNG_EVENT_CONTEXT_VPPID:
 362                 return config_event_context_vppid;
 363         case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
 364                 return config_event_context_pthread_id;
 365         case LTTNG_EVENT_CONTEXT_HOSTNAME:
 366                 return config_event_context_hostname;
 367         case LTTNG_EVENT_CONTEXT_IP:
 368                 return config_event_context_ip;
 369         default:
 370                 return NULL;
 371         }
 372 }
 373
 374 LTTNG_HIDDEN
 375 const char *mi_lttng_eventfieldtype_string(enum lttng_event_field_type val)
 376 {
 377         switch (val) {
 378         case(LTTNG_EVENT_FIELD_INTEGER):
 379                 return mi_lttng_element_type_integer;
 380         case(LTTNG_EVENT_FIELD_ENUM):
 381                 return mi_lttng_element_type_enum;
 382         case(LTTNG_EVENT_FIELD_FLOAT):
 383                 return mi_lttng_element_type_float;
 384         case(LTTNG_EVENT_FIELD_STRING):
 385                 return mi_lttng_element_type_string;
 386         default:
 387                 return mi_lttng_element_type_other;
 388         }
 389 }
 390
 391 LTTNG_HIDDEN
 392 const char *mi_lttng_domaintype_string(enum lttng_domain_type value)
 393 {
 394         /* Note: This is a *duplicate* of get_domain_str from bin/lttng/utils.c */
 395         switch (value) {
 396         case LTTNG_DOMAIN_KERNEL:
 397                 return config_domain_type_kernel;
 398         case LTTNG_DOMAIN_UST:
 399                 return config_domain_type_ust;
 400         case LTTNG_DOMAIN_JUL:
 401                 return config_domain_type_jul;
 402         case LTTNG_DOMAIN_LOG4J:
 403                 return config_domain_type_log4j;
 404         case LTTNG_DOMAIN_PYTHON:
 405                 return config_domain_type_python;
 406         default:
 407                 /* Should not have an unknown domain */
 408                 assert(0);
 409                 return NULL;
 410         }
 411 }
 412
 413 LTTNG_HIDDEN
 414 const char *mi_lttng_buffertype_string(enum lttng_buffer_type value)
 415 {
 416         switch (value) {
 417         case LTTNG_BUFFER_PER_PID:
 418                 return config_buffer_type_per_pid;
 419         case LTTNG_BUFFER_PER_UID:
 420                 return config_buffer_type_per_uid;
 421         case LTTNG_BUFFER_GLOBAL:
 422                 return config_buffer_type_global;
 423         default:
 424                 /* Should not have an unknow buffer type */
 425                 assert(0);
 426                 return NULL;
 427         }
 428 }
 429
 430 LTTNG_HIDDEN
 431 const char *mi_lttng_calibratetype_string(enum lttng_calibrate_type val)
 432 {
 433         const char *ret;
 434
 435         switch (val) {
 436         case LTTNG_CALIBRATE_FUNCTION:
 437                 ret = mi_lttng_element_calibrate_function;
 438                 break;
 439         default:
 440                 ret = mi_lttng_element_empty;
 441                 break;
 442         }
 443         return ret;
 444 }
 445
 446 LTTNG_HIDDEN
 447 struct mi_writer *mi_lttng_writer_create(int fd_output, int mi_output_type)
 448 {
 449         struct mi_writer *mi_writer;
 450
 451         mi_writer = zmalloc(sizeof(struct mi_writer));
 452         if (!mi_writer) {
 453                 PERROR("zmalloc mi_writer_create");
 454                 goto end;
 455         }
 456         if (mi_output_type == LTTNG_MI_XML) {
 457                 mi_writer->writer = config_writer_create(fd_output, 0);
 458                 if (!mi_writer->writer) {
 459                         goto err_destroy;
 460                 }
 461                 mi_writer->type = LTTNG_MI_XML;
 462         } else {
 463                 goto err_destroy;
 464         }
 465
 466 end:
 467         return mi_writer;
 468
 469 err_destroy:
 470         free(mi_writer);
 471         return NULL;
 472 }
 473
 474 LTTNG_HIDDEN
 475 int mi_lttng_writer_destroy(struct mi_writer *writer)
 476 {
 477         int ret;
 478
 479         if (!writer) {
 480                 ret = -EINVAL;
 481                 goto end;
 482         }
 483
 484         ret = config_writer_destroy(writer->writer);
 485         if (ret < 0) {
 486                 goto end;
 487         }
 488
 489         free(writer);
 490 end:
 491         return ret;
 492 }
 493
 494 LTTNG_HIDDEN
 495 int mi_lttng_writer_command_open(struct mi_writer *writer, const char *command)
 496 {
 497         int ret;
 498
 499         /*
 500          * A command is always the MI's root node, it must declare the current
 501          * namespace and schema URIs and the schema's version.
 502          */
 503         ret = config_writer_open_element(writer->writer,
 504                         mi_lttng_element_command);
 505         if (ret) {
 506                 goto end;
 507         }
 508
 509         ret = config_writer_write_attribute(writer->writer,
 510                         mi_lttng_xmlns, DEFAULT_LTTNG_MI_NAMESPACE);
 511         if (ret) {
 512                 goto end;
 513         }
 514
 515         ret = config_writer_write_attribute(writer->writer,
 516                         mi_lttng_xmlns_xsi, mi_lttng_w3_schema_uri);
 517         if (ret) {
 518                 goto end;
 519         }
 520
 521         ret = config_writer_write_attribute(writer->writer,
 522                         mi_lttng_schema_location,
 523                         mi_lttng_schema_location_uri);
 524         if (ret) {
 525                 goto end;
 526         }
 527
 528         ret = config_writer_write_attribute(writer->writer,
 529                         mi_lttng_schema_version,
 530                         mi_lttng_schema_version_value);
 531         if (ret) {
 532                 goto end;
 533         }
 534
 535         ret = mi_lttng_writer_write_element_string(writer,
 536                         mi_lttng_element_command_name, command);
 537 end:
 538         return ret;
 539 }
 540
 541 LTTNG_HIDDEN
 542 int mi_lttng_writer_command_close(struct mi_writer *writer)
 543 {
 544         return mi_lttng_writer_close_element(writer);
 545 }
 546
 547 LTTNG_HIDDEN
 548 int mi_lttng_writer_open_element(struct mi_writer *writer,
 549                 const char *element_name)
 550 {
 551         return config_writer_open_element(writer->writer, element_name);
 552 }
 553
 554 LTTNG_HIDDEN
 555 int mi_lttng_writer_close_element(struct mi_writer *writer)
 556 {
 557         return config_writer_close_element(writer->writer);
 558 }
 559
 560 LTTNG_HIDDEN
 561 int mi_lttng_close_multi_element(struct mi_writer *writer,
 562                 unsigned int nb_element)
 563 {
 564         int ret, i;
 565
 566         if (nb_element < 1) {
 567                 ret = 0;
 568                 goto end;
 569         }
 570         for (i = 0; i < nb_element; i++) {
 571                 ret = mi_lttng_writer_close_element(writer);
 572                 if (ret) {
 573                         goto end;
 574                 }
 575         }
 576 end:
 577         return ret;
 578 }
 579
 580 LTTNG_HIDDEN
 581 int mi_lttng_writer_write_element_unsigned_int(struct mi_writer *writer,
 582                 const char *element_name, uint64_t value)
 583 {
 584         return config_writer_write_element_unsigned_int(writer->writer,
 585                         element_name, value);
 586 }
 587
 588 LTTNG_HIDDEN
 589 int mi_lttng_writer_write_element_signed_int(struct mi_writer *writer,
 590                 const char *element_name, int64_t value)
 591 {
 592         return config_writer_write_element_signed_int(writer->writer,
 593                         element_name, value);
 594 }
 595
 596 LTTNG_HIDDEN
 597 int mi_lttng_writer_write_element_bool(struct mi_writer *writer,
 598                 const char *element_name, int value)
 599 {
 600         return config_writer_write_element_bool(writer->writer,
 601                         element_name, value);
 602 }
 603
 604 LTTNG_HIDDEN
 605 int mi_lttng_writer_write_element_string(struct mi_writer *writer,
 606                 const char *element_name, const char *value)
 607 {
 608         return config_writer_write_element_string(writer->writer,
 609                         element_name, value);
 610 }
 611
 612 LTTNG_HIDDEN
 613 int mi_lttng_version(struct mi_writer *writer, struct mi_lttng_version *version,
 614         const char *lttng_description, const char *lttng_license)
 615 {
 616         int ret;
 617
 618         /* Open version */
 619         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_version);
 620         if (ret) {
 621                 goto end;
 622         }
 623
 624         /* Version string (contain info like rc etc.) */
 625         ret = mi_lttng_writer_write_element_string(writer,
 626                         mi_lttng_element_version_str, version->version);
 627         if (ret) {
 628                 goto end;
 629         }
 630
 631         /* Major version number */
 632         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 633                         mi_lttng_element_version_major, version->version_major);
 634         if (ret) {
 635                 goto end;
 636         }
 637
 638         /* Minor version number */
 639         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 640                         mi_lttng_element_version_minor, version->version_minor);
 641         if (ret) {
 642                 goto end;
 643         }
 644
 645         /* Commit version number */
 646         ret = mi_lttng_writer_write_element_string(writer,
 647                         mi_lttng_element_version_commit, version->version_commit);
 648         if (ret) {
 649                 goto end;
 650         }
 651
 652         /* Patch number */
 653         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 654                         mi_lttng_element_version_patch_level, version->version_patchlevel);
 655         if (ret) {
 656                 goto end;
 657         }
 658
 659         /* Name of the version */
 660         ret = mi_lttng_writer_write_element_string(writer,
 661                         config_element_name, version->version_name);
 662         if (ret) {
 663                 goto end;
 664         }
 665
 666         /* Description mostly related to beer... */
 667         ret = mi_lttng_writer_write_element_string(writer,
 668                         mi_lttng_element_version_description, lttng_description);
 669         if (ret) {
 670                 goto end;
 671         }
 672
 673         /* url */
 674         ret = mi_lttng_writer_write_element_string(writer,
 675                         mi_lttng_element_version_web, version->package_url);
 676         if (ret) {
 677                 goto end;
 678         }
 679
 680         /* License: free as in free beer...no...*speech* */
 681         ret = mi_lttng_writer_write_element_string(writer,
 682                         mi_lttng_element_version_license, lttng_license);
 683         if (ret) {
 684                 goto end;
 685         }
 686
 687         /* Close version element */
 688         ret = mi_lttng_writer_close_element(writer);
 689
 690 end:
 691         return ret;
 692 }
 693
 694 LTTNG_HIDDEN
 695 int mi_lttng_sessions_open(struct mi_writer *writer)
 696 {
 697         return mi_lttng_writer_open_element(writer, config_element_sessions);
 698 }
 699
 700 LTTNG_HIDDEN
 701 int mi_lttng_session(struct mi_writer *writer,
 702                 struct lttng_session *session, int is_open)
 703 {
 704         int ret;
 705
 706         assert(session);
 707
 708         /* Open sessions element */
 709         ret = mi_lttng_writer_open_element(writer,
 710                         config_element_session);
 711         if (ret) {
 712                 goto end;
 713         }
 714
 715         /* Name of the session */
 716         ret = mi_lttng_writer_write_element_string(writer,
 717                         config_element_name, session->name);
 718         if (ret) {
 719                 goto end;
 720         }
 721
 722         /* Path */
 723         ret = mi_lttng_writer_write_element_string(writer,
 724                         config_element_path, session->path);
 725         if (ret) {
 726                 goto end;
 727         }
 728
 729         /* Enabled ? */
 730         ret = mi_lttng_writer_write_element_bool(writer,
 731                         config_element_enabled, session->enabled);
 732         if (ret) {
 733                 goto end;
 734         }
 735
 736         /* Snapshot mode */
 737         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 738                         config_element_snapshot_mode, session->snapshot_mode);
 739         if (ret) {
 740                 goto end;
 741         }
 742
 743         /* Live timer interval in usec */
 744         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 745                         config_element_live_timer_interval,
 746                         session->live_timer_interval);
 747         if (ret) {
 748                 goto end;
 749         }
 750
 751         if (!is_open) {
 752                 /* Closing session element */
 753                 ret = mi_lttng_writer_close_element(writer);
 754         }
 755 end:
 756         return ret;
 757
 758 }
 759
 760 LTTNG_HIDDEN
 761 int mi_lttng_domains_open(struct mi_writer *writer)
 762 {
 763         return mi_lttng_writer_open_element(writer, config_element_domains);
 764 }
 765
 766 LTTNG_HIDDEN
 767 int mi_lttng_domain(struct mi_writer *writer,
 768                 struct lttng_domain *domain, int is_open)
 769 {
 770         int ret = 0;
 771         const char *str_domain;
 772         const char *str_buffer;
 773
 774         assert(domain);
 775
 776         /* Open domain element */
 777         ret = mi_lttng_writer_open_element(writer, config_element_domain);
 778         if (ret) {
 779                 goto end;
 780         }
 781
 782         /* Domain Type */
 783         str_domain = mi_lttng_domaintype_string(domain->type);
 784         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
 785                         str_domain);
 786         if (ret) {
 787                 goto end;
 788         }
 789
 790         /* Buffer Type */
 791         str_buffer= mi_lttng_buffertype_string(domain->buf_type);
 792         ret = mi_lttng_writer_write_element_string(writer,
 793                         config_element_buffer_type, str_buffer);
 794         if (ret) {
 795                 goto end;
 796         }
 797
 798         /* TODO: union  attr
 799          * This union is not currently used and was added for
 800          * future ust domain support.
 801          * Date: 25-06-2014
 802          * */
 803
 804         if (!is_open) {
 805                 /* Closing domain element */
 806                 ret = mi_lttng_writer_close_element(writer);
 807         }
 808
 809 end:
 810         return ret;
 811
 812 }
 813
 814 LTTNG_HIDDEN
 815 int mi_lttng_channels_open(struct mi_writer *writer)
 816 {
 817         return mi_lttng_writer_open_element(writer, config_element_channels);
 818 }
 819
 820 LTTNG_HIDDEN
 821 int mi_lttng_channel(struct mi_writer *writer,
 822                 struct lttng_channel *channel, int is_open)
 823 {
 824         int ret = 0;
 825
 826         assert(channel);
 827
 828         /* Opening channel element */
 829         ret = mi_lttng_writer_open_element(writer, config_element_channel);
 830         if (ret) {
 831                 goto end;
 832         }
 833
 834         /* Name */
 835         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
 836                         channel->name);
 837         if (ret) {
 838                 goto end;
 839         }
 840
 841         /* Enabled ? */
 842         ret = mi_lttng_writer_write_element_bool(writer,
 843                         config_element_enabled, channel->enabled);
 844         if (ret) {
 845                 goto end;
 846         }
 847
 848         /* Attribute */
 849         ret = mi_lttng_channel_attr(writer, &channel->attr);
 850         if (ret) {
 851                 goto end;
 852         }
 853
 854         if (!is_open) {
 855                 /* Closing channel element */
 856                 ret = mi_lttng_writer_close_element(writer);
 857                 if (ret) {
 858                         goto end;
 859                 }
 860         }
 861 end:
 862         return ret;
 863 }
 864
 865 LTTNG_HIDDEN
 866 int mi_lttng_channel_attr(struct mi_writer *writer,
 867                 struct lttng_channel_attr *attr)
 868 {
 869         int ret = 0;
 870         struct lttng_channel *chan = caa_container_of(attr,
 871                         struct lttng_channel, attr);
 872         uint64_t discarded_events, lost_packets;
 873
 874         assert(attr);
 875
 876         ret = lttng_channel_get_discarded_event_count(chan, &discarded_events);
 877         if (ret) {
 878                 goto end;
 879         }
 880
 881         ret = lttng_channel_get_lost_packet_count(chan, &lost_packets);
 882         if (ret) {
 883                 goto end;
 884         }
 885
 886         /* Opening Attributes */
 887         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
 888         if (ret) {
 889                 goto end;
 890         }
 891
 892         /* Overwrite */
 893         ret = mi_lttng_writer_write_element_string(writer,
 894                 config_element_overwrite_mode,
 895                 attr->overwrite ? config_overwrite_mode_overwrite :
 896                         config_overwrite_mode_discard);
 897         if (ret) {
 898                 goto end;
 899         }
 900
 901         /* Sub buffer size in byte */
 902         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 903                 config_element_subbuf_size, attr->subbuf_size);
 904         if (ret) {
 905                 goto end;
 906         }
 907
 908         /* Number of subbuffer (power of two) */
 909         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 910                 config_element_num_subbuf,
 911                 attr->num_subbuf);
 912         if (ret) {
 913                 goto end;
 914         }
 915
 916         /* Switch timer interval in usec */
 917         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 918                 config_element_switch_timer_interval,
 919                 attr->switch_timer_interval);
 920         if (ret) {
 921                 goto end;
 922         }
 923
 924         /* Read timer interval in usec */
 925         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 926                 config_element_read_timer_interval,
 927                 attr->read_timer_interval);
 928         if (ret) {
 929                 goto end;
 930         }
 931
 932         /* Event output */
 933         ret = mi_lttng_writer_write_element_string(writer,
 934                 config_element_output_type,
 935                 attr->output == LTTNG_EVENT_SPLICE ?
 936                 config_output_type_splice : config_output_type_mmap);
 937         if (ret) {
 938                 goto end;
 939         }
 940
 941         /* Tracefile size in bytes */
 942         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 943                 config_element_tracefile_size, attr->tracefile_size);
 944         if (ret) {
 945                 goto end;
 946         }
 947
 948         /* Count of tracefiles */
 949         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 950                 config_element_tracefile_count,
 951                 attr->tracefile_count);
 952         if (ret) {
 953                 goto end;
 954         }
 955
 956         /* Live timer interval in usec*/
 957         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 958                 config_element_live_timer_interval,
 959                 attr->live_timer_interval);
 960         if (ret) {
 961                 goto end;
 962         }
 963
 964         /* Discarded events */
 965         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 966                 config_element_discarded_events,
 967                 discarded_events);
 968         if (ret) {
 969                 goto end;
 970         }
 971
 972         /* Lost packets */
 973         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 974                 config_element_lost_packets,
 975                 lost_packets);
 976         if (ret) {
 977                 goto end;
 978         }
 979
 980         /* Closing attributes */
 981         ret = mi_lttng_writer_close_element(writer);
 982         if (ret) {
 983                 goto end;
 984         }
 985 end:
 986         return ret;
 987
 988 }
 989
 990 LTTNG_HIDDEN
 991 int mi_lttng_event_common_attributes(struct mi_writer *writer,
 992                 struct lttng_event *event)
 993 {
 994         int ret;
 995         const char *filter_expression;
 996
 997         /* Open event element */
 998         ret = mi_lttng_writer_open_element(writer, config_element_event);
 999         if (ret) {
1000                 goto end;
1001         }
1002
1003         /* Event name */
1004         ret = mi_lttng_writer_write_element_string(writer,
1005                         config_element_name, event->name);
1006         if (ret) {
1007                 goto end;
1008         }
1009
1010         /* Event type */
1011         ret = mi_lttng_writer_write_element_string(writer,
1012                         config_element_type, mi_lttng_eventtype_string(event->type));
1013         if (ret) {
1014                 goto end;
1015         }
1016
1017         /* Is event enabled */
1018         ret = mi_lttng_writer_write_element_bool(writer,
1019                         config_element_enabled, event->enabled);
1020         if (ret) {
1021                 goto end;
1022         }
1023
1024         /* Event filter expression */
1025         ret = lttng_event_get_filter_string(event, &filter_expression);
1026         if (ret) {
1027                 goto end;
1028         }
1029
1030         if (filter_expression) {
1031                 ret = mi_lttng_writer_write_element_string(writer,
1032                                 config_element_filter_expression,
1033                                 filter_expression);
1034                 if (ret) {
1035                         goto end;
1036                 }
1037         }
1038
1039 end:
1040         return ret;
1041 }
1042
1043 static int write_event_exclusions(struct mi_writer *writer,
1044                 struct lttng_event *event)
1045 {
1046         int i;
1047         int ret;
1048         int exclusion_count;
1049
1050         /* Open event exclusions */
1051         ret = mi_lttng_writer_open_element(writer, config_element_exclusions);
1052         if (ret) {
1053                 goto end;
1054         }
1055
1056         exclusion_count = lttng_event_get_exclusion_name_count(event);
1057         if (exclusion_count < 0) {
1058                 ret = exclusion_count;
1059                 goto end;
1060         }
1061
1062         for (i = 0; i < exclusion_count; i++) {
1063                 const char *name;
1064
1065                 ret = lttng_event_get_exclusion_name(event, i, &name);
1066                 if (ret) {
1067                         /* Close exclusions */
1068                         mi_lttng_writer_close_element(writer);
1069                         goto end;
1070                 }
1071
1072                 ret = mi_lttng_writer_write_element_string(writer,
1073                                 config_element_exclusion, name);
1074                 if (ret) {
1075                         /* Close exclusions */
1076                         mi_lttng_writer_close_element(writer);
1077                         goto end;
1078                 }
1079         }
1080
1081         /* Close exclusions */
1082         ret = mi_lttng_writer_close_element(writer);
1083
1084 end:
1085         return ret;
1086 }
1087
1088 LTTNG_HIDDEN
1089 int mi_lttng_event_tracepoint_loglevel(struct mi_writer *writer,
1090                 struct lttng_event *event, enum lttng_domain_type domain)
1091 {
1092         int ret;
1093
1094         /* Event loglevel */
1095         ret = mi_lttng_writer_write_element_string(writer,
1096                         config_element_loglevel,
1097                         mi_lttng_loglevel_string(event->loglevel, domain));
1098         if (ret) {
1099                 goto end;
1100         }
1101
1102         /* Log level type */
1103         ret = mi_lttng_writer_write_element_string(writer,
1104                         config_element_loglevel_type,
1105                         mi_lttng_logleveltype_string(event->loglevel_type));
1106         if (ret) {
1107                 goto end;
1108         }
1109
1110         /* Event exclusions */
1111         ret = write_event_exclusions(writer, event);
1112
1113 end:
1114         return ret;
1115 }
1116
1117 LTTNG_HIDDEN
1118 int mi_lttng_event_tracepoint_no_loglevel(struct mi_writer *writer,
1119                 struct lttng_event *event)
1120 {
1121         /* event exclusion filter */
1122         return write_event_exclusions(writer, event);
1123 }
1124
1125 LTTNG_HIDDEN
1126 int mi_lttng_event_function_probe(struct mi_writer *writer,
1127                 struct lttng_event *event)
1128 {
1129         int ret;
1130
1131         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1132         if (ret) {
1133                 goto end;
1134         }
1135
1136         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1137         if (ret) {
1138                 goto end;
1139         }
1140
1141         if (event->attr.probe.addr != 0) {
1142                 /* event probe address */
1143                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1144                                 config_element_address, event->attr.probe.addr);
1145                 if (ret) {
1146                         goto end;
1147                 }
1148         } else {
1149                 /* event probe offset */
1150                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1151                                 config_element_offset, event->attr.probe.offset);
1152                 if (ret) {
1153                         goto end;
1154                 }
1155
1156                 /* event probe symbol_name */
1157                 ret = mi_lttng_writer_write_element_string(writer,
1158                                 config_element_symbol_name, event->attr.probe.symbol_name);
1159                 if (ret) {
1160                         goto end;
1161                 }
1162         }
1163
1164         /* Close probe_attributes and attributes */
1165         ret = mi_lttng_close_multi_element(writer, 2);
1166 end:
1167         return ret;
1168 }
1169
1170 LTTNG_HIDDEN
1171 int mi_lttng_event_function_entry(struct mi_writer *writer,
1172                 struct lttng_event *event)
1173 {
1174         int ret;
1175
1176         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1177         if (ret) {
1178                 goto end;
1179         }
1180
1181         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1182         if (ret) {
1183                 goto end;
1184         }
1185
1186         /* event probe symbol_name */
1187         ret = mi_lttng_writer_write_element_string(writer,
1188                         config_element_symbol_name, event->attr.ftrace.symbol_name);
1189         if (ret) {
1190                 goto end;
1191         }
1192
1193         /* Close function_attributes and attributes */
1194         ret = mi_lttng_close_multi_element(writer, 2);
1195 end:
1196         return ret;
1197 }
1198
1199 LTTNG_HIDDEN
1200 int mi_lttng_events_open(struct mi_writer *writer)
1201 {
1202         return mi_lttng_writer_open_element(writer, config_element_events);
1203 }
1204
1205 LTTNG_HIDDEN
1206 int mi_lttng_event(struct mi_writer *writer,
1207                 struct lttng_event *event, int is_open, enum lttng_domain_type domain)
1208 {
1209         int ret;
1210
1211         ret = mi_lttng_event_common_attributes(writer, event);
1212         if (ret) {
1213                 goto end;
1214         }
1215
1216         switch (event->type) {
1217         case LTTNG_EVENT_TRACEPOINT:
1218         {
1219                 if (event->loglevel != -1) {
1220                         ret = mi_lttng_event_tracepoint_loglevel(writer, event, domain);
1221                 } else {
1222                         ret = mi_lttng_event_tracepoint_no_loglevel(writer, event);
1223                 }
1224                 break;
1225         }
1226         case LTTNG_EVENT_FUNCTION:
1227                 /* Fallthrough */
1228         case LTTNG_EVENT_PROBE:
1229                 ret = mi_lttng_event_function_probe(writer, event);
1230                 break;
1231         case LTTNG_EVENT_FUNCTION_ENTRY:
1232                 ret = mi_lttng_event_function_entry(writer, event);
1233                 break;
1234         case LTTNG_EVENT_ALL:
1235                 /* Fallthrough */
1236         default:
1237                 break;
1238         }
1239
1240         if (!is_open) {
1241                 ret = mi_lttng_writer_close_element(writer);
1242         }
1243
1244 end:
1245         return ret;
1246 }
1247
1248 LTTNG_HIDDEN
1249 int mi_lttng_trackers_open(struct mi_writer *writer)
1250 {
1251         return mi_lttng_writer_open_element(writer, config_element_trackers);
1252 }
1253
1254 LTTNG_HIDDEN
1255 int mi_lttng_pid_tracker_open(struct mi_writer *writer)
1256 {
1257         int ret;
1258
1259         /* Open element pid_tracker */
1260         ret = mi_lttng_writer_open_element(writer, config_element_pid_tracker);
1261         if (ret) {
1262                 goto end;
1263         }
1264
1265         /* Open targets element */
1266         ret = mi_lttng_targets_open(writer);
1267 end:
1268         return ret;
1269 }
1270
1271 LTTNG_HIDDEN
1272 int mi_lttng_pids_open(struct mi_writer *writer)
1273 {
1274         return mi_lttng_writer_open_element(writer, config_element_pids);
1275 }
1276
1277 /*
1278  * TODO: move the listing of pid for user agent to process semantic on
1279  * mi api bump. The use of process element break the mi api.
1280  */
1281 LTTNG_HIDDEN
1282 int mi_lttng_pid(struct mi_writer *writer, pid_t pid , const char *name,
1283                 int is_open)
1284 {
1285         int ret;
1286
1287         /* Open pid process */
1288         ret = mi_lttng_writer_open_element(writer, config_element_pid);
1289         if (ret) {
1290                 goto end;
1291         }
1292
1293         /* Writing pid number */
1294         ret = mi_lttng_writer_write_element_signed_int(writer,
1295                         mi_lttng_element_pid_id, (int)pid);
1296         if (ret) {
1297                 goto end;
1298         }
1299
1300         /* Writing name of the process */
1301         if (name) {
1302                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1303                                 name);
1304                 if (ret) {
1305                         goto end;
1306                 }
1307         }
1308
1309         if (!is_open) {
1310                 /* Closing Pid */
1311                 ret = mi_lttng_writer_close_element(writer);
1312         }
1313
1314 end:
1315         return ret;
1316 }
1317
1318 LTTNG_HIDDEN
1319 int mi_lttng_targets_open(struct mi_writer *writer)
1320 {
1321         return mi_lttng_writer_open_element(writer,
1322                         config_element_targets);
1323 }
1324
1325 LTTNG_HIDDEN
1326 int mi_lttng_pid_target(struct mi_writer *writer, pid_t pid, int is_open)
1327 {
1328         int ret;
1329
1330         ret = mi_lttng_writer_open_element(writer,
1331                         config_element_target_pid);
1332         if (ret) {
1333                 goto end;
1334         }
1335
1336         /* Writing pid number
1337          * Special case for element all on track untrack command
1338          * All pid is represented as wildcard *
1339          */
1340         if ((int) pid == -1) {
1341                 ret = mi_lttng_writer_write_element_string(writer,
1342                                 config_element_pid,
1343                                 mi_lttng_element_track_untrack_all_wildcard);
1344         } else {
1345                 ret = mi_lttng_writer_write_element_signed_int(writer,
1346                                 config_element_pid, (int) pid);
1347         }
1348         if (ret) {
1349                 goto end;
1350         }
1351
1352         if (!is_open) {
1353                 ret = mi_lttng_writer_close_element(writer);
1354                 if (ret) {
1355                         goto end;
1356                 }
1357         }
1358
1359 end:
1360         return ret;
1361 }
1362
1363 LTTNG_HIDDEN
1364 int mi_lttng_event_fields_open(struct mi_writer *writer)
1365 {
1366         return mi_lttng_writer_open_element(writer, mi_lttng_element_event_fields);
1367 }
1368
1369 LTTNG_HIDDEN
1370 int mi_lttng_event_field(struct mi_writer *writer,
1371                 struct lttng_event_field *field)
1372 {
1373         int ret;
1374
1375         if (!field->field_name[0]) {
1376                 ret = 0;
1377                 goto end;
1378         }
1379
1380         /* Open field */
1381         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_event_field);
1382         if (ret) {
1383                 goto end;
1384         }
1385
1386         if (!field->field_name[0]) {
1387                 goto close;
1388         }
1389
1390         /* Name */
1391         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1392                         field->field_name);
1393         if (ret) {
1394                 goto end;
1395         }
1396
1397         /* Type */
1398         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1399                         mi_lttng_eventfieldtype_string(field->type));
1400         if (ret) {
1401                 goto end;
1402         }
1403
1404         /* nowrite  */
1405         ret = mi_lttng_writer_write_element_signed_int(writer,
1406                         mi_lttng_element_nowrite, field->nowrite);
1407         if (ret) {
1408                 goto end;
1409         }
1410
1411 close:
1412         /* Close field element */
1413         ret = mi_lttng_writer_close_element(writer);
1414
1415 end:
1416         return ret;
1417 }
1418
1419 LTTNG_HIDDEN
1420 int mi_lttng_calibrate(struct mi_writer *writer,
1421                 struct lttng_calibrate *calibrate)
1422 {
1423         int ret;
1424
1425         /* Open calibrate element */
1426         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_calibrate);
1427         if (ret) {
1428                 goto end;
1429         }
1430
1431         /* Calibration type */
1432         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1433                         mi_lttng_calibratetype_string(calibrate->type));
1434         if (ret) {
1435                 goto end;
1436         }
1437
1438         /* Closing calibrate element */
1439         ret = mi_lttng_writer_close_element(writer);
1440 end:
1441         return ret;
1442 }
1443
1444 LTTNG_HIDDEN
1445 int mi_lttng_perf_counter_context(struct mi_writer *writer,
1446                 struct lttng_event_perf_counter_ctx  *perf_context)
1447 {
1448         int ret;
1449
1450         /* Open perf_counter_context */
1451         ret = mi_lttng_writer_open_element(writer,
1452                         mi_lttng_element_perf_counter_context);
1453         if (ret) {
1454                 goto end;
1455         }
1456
1457         /* Type */
1458         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1459                         config_element_type, perf_context->type);
1460         if (ret) {
1461                 goto end;
1462         }
1463
1464         /* Config */
1465         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1466                         config_element_config, perf_context->config);
1467         if (ret) {
1468                 goto end;
1469         }
1470
1471         /* Name of the perf counter */
1472         ret = mi_lttng_writer_write_element_string(writer,
1473                         config_element_name, perf_context->name);
1474         if (ret) {
1475                 goto end;
1476         }
1477
1478         /* Close perf_counter_context */
1479         ret = mi_lttng_writer_close_element(writer);
1480 end:
1481         return ret;
1482 }
1483
1484 static
1485 int mi_lttng_app_context(struct mi_writer *writer,
1486                 const char *provider_name, const char *ctx_name)
1487 {
1488         int ret;
1489
1490         /* Open app */
1491         ret = mi_lttng_writer_open_element(writer,
1492                         config_element_context_app);
1493         if (ret) {
1494                 goto end;
1495         }
1496
1497         /* provider_name */
1498         ret = mi_lttng_writer_write_element_string(writer,
1499                         config_element_context_app_provider_name,
1500                         provider_name);
1501         if (ret) {
1502                 goto end;
1503         }
1504
1505         /* ctx_name */
1506         ret = mi_lttng_writer_write_element_string(writer,
1507                         config_element_context_app_ctx_name, ctx_name);
1508         if (ret) {
1509                 goto end;
1510         }
1511
1512         /* Close app */
1513         ret = mi_lttng_writer_close_element(writer);
1514 end:
1515         return ret;
1516 }
1517
1518 LTTNG_HIDDEN
1519 int mi_lttng_context(struct mi_writer *writer,
1520                 struct lttng_event_context *context, int is_open)
1521 {
1522         int ret;
1523
1524         /* Open context */
1525         ret = mi_lttng_writer_open_element(writer , config_element_context);
1526         if (ret) {
1527                 goto end;
1528         }
1529
1530         /* Special case for PERF_*_COUNTER
1531          * print the lttng_event_perf_counter_ctx*/
1532         switch (context->ctx) {
1533         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
1534         case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
1535         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
1536         {
1537                 struct lttng_event_perf_counter_ctx *perf_context =
1538                                 &context->u.perf_counter;
1539                 ret =  mi_lttng_perf_counter_context(writer, perf_context);
1540                 if (ret) {
1541                         goto end;
1542                 }
1543                 break;
1544         }
1545         case LTTNG_EVENT_CONTEXT_APP_CONTEXT:
1546         {
1547                 ret = mi_lttng_app_context(writer,
1548                                 context->u.app_ctx.provider_name,
1549                                 context->u.app_ctx.ctx_name);
1550                 if (ret) {
1551                         goto end;
1552                 }
1553                 break;
1554         }
1555         default:
1556         {
1557                 const char *type_string = mi_lttng_event_contexttype_string(
1558                                 context->ctx);
1559                 if (!type_string) {
1560                         ret = -LTTNG_ERR_INVALID;
1561                         goto end;
1562                 }
1563
1564                 /* Print context type */
1565                 ret = mi_lttng_writer_write_element_string(writer,
1566                                 config_element_type, type_string);
1567                 break;
1568         }
1569         }
1570
1571         /* Close context */
1572         if (!is_open) {
1573                 ret = mi_lttng_writer_close_element(writer);
1574         }
1575
1576 end:
1577         return ret;
1578 }
1579
1580 LTTNG_HIDDEN
1581 int mi_lttng_snapshot_output_session_name(struct mi_writer *writer,
1582                 const char *session_name)
1583 {
1584         int ret;
1585
1586         /* Open session element */
1587         ret = mi_lttng_writer_open_element(writer, config_element_session);
1588         if (ret) {
1589                 goto end;
1590         }
1591
1592         /* Snapshot output list for current session name */
1593         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1594                         session_name);
1595         if (ret) {
1596                 goto end;
1597         }
1598
1599         /* Open element snapshots (sequence one snapshot) */
1600         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_snapshots);
1601         if (ret) {
1602                 goto end;
1603         }
1604
1605 end:
1606         return ret;
1607 }
1608
1609 LTTNG_HIDDEN
1610 int mi_lttng_snapshot_list_output(struct mi_writer *writer,
1611                 struct lttng_snapshot_output *output)
1612 {
1613         int ret;
1614
1615         /* Open element snapshot output */
1616         ret = mi_lttng_writer_open_element(writer,
1617                         mi_lttng_element_command_snapshot);
1618         if (ret) {
1619                 goto end;
1620         }
1621
1622         /* ID of the snapshot output */
1623         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1624                         mi_lttng_element_id, output->id);
1625         if (ret) {
1626                 goto end;
1627         }
1628
1629         /* Name of the output */
1630         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1631                         output->name);
1632         if (ret) {
1633                 goto end;
1634         }
1635
1636         /* Destination of the output (ctrl_url)*/
1637         ret = mi_lttng_writer_write_element_string(writer,
1638                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1639         if (ret) {
1640                 goto end;
1641         }
1642
1643         /* Destination of the output (data_url) */
1644         ret = mi_lttng_writer_write_element_string(writer,
1645                         mi_lttng_element_snapshot_data_url, output->data_url);
1646         if (ret) {
1647                 goto end;
1648         }
1649
1650         /* total size of all stream combined */
1651         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1652                         mi_lttng_element_snapshot_max_size, output->max_size);
1653         if (ret) {
1654                 goto end;
1655         }
1656
1657         /* Close snapshot output element */
1658         ret = mi_lttng_writer_close_element(writer);
1659
1660 end:
1661         return ret;
1662 }
1663
1664 LTTNG_HIDDEN
1665 int mi_lttng_snapshot_del_output(struct mi_writer *writer, int id,
1666                 const char *name, const char *current_session_name)
1667 {
1668         int ret;
1669
1670         /* Open element del_snapshot */
1671         ret = mi_lttng_writer_open_element(writer,
1672                         mi_lttng_element_command_snapshot);
1673         if (ret) {
1674                 goto end;
1675         }
1676
1677
1678         if (id != UINT32_MAX) {
1679                 /* "Snapshot output "id" successfully deleted
1680                  * for "current_session_name"
1681                  * ID of the snapshot output
1682                  */
1683                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1684                                 mi_lttng_element_id, id);
1685                 if (ret) {
1686                         goto end;
1687                 }
1688         } else {
1689                 /* "Snapshot output "name" successfully deleted
1690                  * for session "current_session_name"
1691                  * Name of the output
1692                  */
1693                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1694                                 name);
1695                 if (ret) {
1696                         goto end;
1697                 }
1698         }
1699
1700         /* Snapshot was deleted for session "current_session_name"*/
1701         ret = mi_lttng_writer_write_element_string(writer,
1702                         mi_lttng_element_snapshot_session_name,
1703                         current_session_name);
1704         if (ret) {
1705                 goto end;
1706         }
1707
1708         /* Close snapshot element */
1709         ret = mi_lttng_writer_close_element(writer);
1710
1711 end:
1712         return ret;
1713 }
1714
1715 LTTNG_HIDDEN
1716 int mi_lttng_snapshot_add_output(struct mi_writer *writer,
1717                 const char *current_session_name, const char *n_ptr,
1718                 struct lttng_snapshot_output *output)
1719 {
1720         int ret;
1721
1722         /* Open element snapshot */
1723         ret = mi_lttng_writer_open_element(writer,
1724                         mi_lttng_element_command_snapshot);
1725         if (ret) {
1726                 goto end;
1727         }
1728
1729         /* Snapshot output id */
1730         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1731                         mi_lttng_element_id, output->id);
1732         if (ret) {
1733                 goto end;
1734         }
1735
1736         /* Snapshot output names */
1737         ret = mi_lttng_writer_write_element_string(writer,
1738                         config_element_name, n_ptr);
1739         if (ret) {
1740                 goto end;
1741         }
1742
1743         /* Destination of the output (ctrl_url)*/
1744         ret = mi_lttng_writer_write_element_string(writer,
1745                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1746         if (ret) {
1747                 goto end;
1748         }
1749
1750         /* Snapshot added for session "current_session_name"*/
1751         ret = mi_lttng_writer_write_element_string(writer,
1752                         mi_lttng_element_snapshot_session_name, current_session_name);
1753         if (ret) {
1754                 goto end;
1755         }
1756
1757         /* total size of all stream combined */
1758         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1759                         mi_lttng_element_snapshot_max_size, output->max_size);
1760         if (ret) {
1761                 goto end;
1762         }
1763
1764         /* Close snapshot element */
1765         ret = mi_lttng_writer_close_element(writer);
1766
1767 end:
1768         return ret;
1769 }
1770
1771 LTTNG_HIDDEN
1772 int mi_lttng_snapshot_record(struct mi_writer *writer,
1773                 const char *current_session_name, const char *url,
1774                 const char *cmdline_ctrl_url, const char *cmdline_data_url)
1775 {
1776         int ret;
1777
1778         /* Open element snapshot */
1779         ret = mi_lttng_writer_open_element(writer,
1780                         mi_lttng_element_command_snapshot);
1781         if (ret) {
1782                 goto end;
1783         }
1784
1785         /*
1786          * If a valid an URL was given, serialize it,
1787          * else take the command line data and ctrl urls*/
1788         if (url) {
1789                 /* Destination of the output (ctrl_url)*/
1790                 ret = mi_lttng_writer_write_element_string(writer,
1791                                 mi_lttng_element_snapshot_ctrl_url, url);
1792                 if (ret) {
1793                         goto end;
1794                 }
1795         } else if (cmdline_ctrl_url) {
1796                 /* Destination of the output (ctrl_url)*/
1797                 ret = mi_lttng_writer_write_element_string(writer,
1798                                 mi_lttng_element_snapshot_ctrl_url, cmdline_ctrl_url);
1799                 if (ret) {
1800                         goto end;
1801                 }
1802
1803                 /* Destination of the output (data_url) */
1804                 ret = mi_lttng_writer_write_element_string(writer,
1805                                 mi_lttng_element_snapshot_data_url, cmdline_data_url);
1806                 if (ret) {
1807                         goto end;
1808                 }
1809         }
1810
1811         /* Close record_snapshot element */
1812         ret = mi_lttng_writer_close_element(writer);
1813
1814 end:
1815         return ret;
1816 }