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  *
   5  * This program is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License, version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This program is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
  12  * more details.
  13  *
  14  * You should have received a copy of the GNU General Public License along with
  15  * this program; if not, write to the Free Software Foundation, Inc., 51
  16  * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  17  */
  18
  19 #define _LGPL_SOURCE
  20 #include <common/config/session-config.h>
  21 #include <lttng/snapshot-internal.h>
  22 #include "mi-lttng.h"
  23
  24 #include <assert.h>
  25
  26 /* Strings related to command */
  27 const char * const mi_lttng_element_command = "command";
  28 const char * const mi_lttng_element_command_action = "snapshot_action";
  29 const char * const mi_lttng_element_command_add_context = "add-context";
  30 const char * const mi_lttng_element_command_calibrate = "calibrate";
  31 const char * const mi_lttng_element_command_create = "create";
  32 const char * const mi_lttng_element_command_destroy = "destroy";
  33 const char * const mi_lttng_element_command_disable_channel = "disable-channel";
  34 const char * const mi_lttng_element_command_disable_event = "disable-event";
  35 const char * const mi_lttng_element_command_enable_channels = "enable-channel";
  36 const char * const mi_lttng_element_command_enable_event = "enable-event";
  37 const char * const mi_lttng_element_command_list = "list";
  38 const char * const mi_lttng_element_command_load = "load";
  39 const char * const mi_lttng_element_command_name = "name";
  40 const char * const mi_lttng_element_command_output = "output";
  41 const char * const mi_lttng_element_command_save = "save";
  42 const char * const mi_lttng_element_command_set_session = "set-session";
  43 const char * const mi_lttng_element_command_snapshot = "snapshot";
  44 const char * const mi_lttng_element_command_snapshot_add = "add_snapshot";
  45 const char * const mi_lttng_element_command_snapshot_del = "del_snapshot";
  46 const char * const mi_lttng_element_command_snapshot_list = "list_snapshot";
  47 const char * const mi_lttng_element_command_snapshot_record = "record_snapshot";
  48 const char * const mi_lttng_element_command_start = "start";
  49 const char * const mi_lttng_element_command_stop = "stop";
  50 const char * const mi_lttng_element_command_success = "success";
  51 const char * const mi_lttng_element_command_track = "track";
  52 const char * const mi_lttng_element_command_untrack = "untrack";
  53 const char * const mi_lttng_element_command_version = "version";
  54
  55 /* Strings related to version command */
  56 const char * const mi_lttng_element_version = "version";
  57 const char * const mi_lttng_element_version_commit = "commit";
  58 const char * const mi_lttng_element_version_description = "description";
  59 const char * const mi_lttng_element_version_license = "license";
  60 const char * const mi_lttng_element_version_major = "major";
  61 const char * const mi_lttng_element_version_minor = "minor";
  62 const char * const mi_lttng_element_version_patch_level = "patchLevel";
  63 const char * const mi_lttng_element_version_str = "string";
  64 const char * const mi_lttng_element_version_web = "url";
  65
  66 /* String related to a lttng_event_field */
  67 const char * const mi_lttng_element_event_field = "event_field";
  68 const char * const mi_lttng_element_event_fields = "event_fields";
  69
  70 /* String related to lttng_event_context */
  71 const char * const mi_lttng_context_type_perf_counter = "PERF_COUNTER";
  72 const char * const mi_lttng_context_type_perf_cpu_counter = "PERF_CPU_COUNTER";
  73 const char * const mi_lttng_context_type_perf_thread_counter = "PERF_THREAD_COUNTER";
  74
  75 /* String related to lttng_event_perf_counter_ctx */
  76 const char * const mi_lttng_element_perf_counter_context = "perf_counter_context";
  77
  78 /* Strings related to pid */
  79 const char * const mi_lttng_element_pid_id = "id";
  80
  81 /* Strings related to save command */
  82 const char * const mi_lttng_element_save = "save";
  83
  84 /* Strings related to load command */
  85 const char * const mi_lttng_element_load = "load";
  86
  87 /* General elements of mi_lttng */
  88 const char * const mi_lttng_element_empty = "";
  89 const char * const mi_lttng_element_id = "id";
  90 const char * const mi_lttng_element_nowrite = "nowrite";
  91 const char * const mi_lttng_element_success = "success";
  92 const char * const mi_lttng_element_type_enum = "ENUM";
  93 const char * const mi_lttng_element_type_float = "FLOAT";
  94 const char * const mi_lttng_element_type_integer = "INTEGER";
  95 const char * const mi_lttng_element_type_other = "OTHER";
  96 const char * const mi_lttng_element_type_string = "STRING";
  97
  98 /* String related to loglevel */
  99 const char * const mi_lttng_loglevel_str_alert = "TRACE_ALERT";
 100 const char * const mi_lttng_loglevel_str_crit = "TRACE_CRIT";
 101 const char * const mi_lttng_loglevel_str_debug = "TRACE_DEBUG";
 102 const char * const mi_lttng_loglevel_str_debug_function = "TRACE_DEBUG_FUNCTION";
 103 const char * const mi_lttng_loglevel_str_debug_line = "TRACE_DEBUG_LINE";
 104 const char * const mi_lttng_loglevel_str_debug_module = "TRACE_DEBUG_MODULE";
 105 const char * const mi_lttng_loglevel_str_debug_process = "TRACE_DEBUG_PROCESS";
 106 const char * const mi_lttng_loglevel_str_debug_program = "TRACE_DEBUG_PROGRAM";
 107 const char * const mi_lttng_loglevel_str_debug_system = "TRACE_DEBUG_SYSTEM";
 108 const char * const mi_lttng_loglevel_str_debug_unit = "TRACE_DEBUG_UNIT";
 109 const char * const mi_lttng_loglevel_str_emerg = "TRACE_EMERG";
 110 const char * const mi_lttng_loglevel_str_err = "TRACE_ERR";
 111 const char * const mi_lttng_loglevel_str_info = "TRACE_INFO";
 112 const char * const mi_lttng_loglevel_str_notice = "TRACE_NOTICE";
 113 const char * const mi_lttng_loglevel_str_unknown = "UNKNOWN";
 114 const char * const mi_lttng_loglevel_str_warning = "TRACE_WARNING";
 115
 116 /* String related to loglevel JUL */
 117 const char * const mi_lttng_loglevel_str_jul_all = "JUL_ALL";
 118 const char * const mi_lttng_loglevel_str_jul_config = "JUL_CONFIG";
 119 const char * const mi_lttng_loglevel_str_jul_fine = "JUL_FINE";
 120 const char * const mi_lttng_loglevel_str_jul_finer = "JUL_FINER";
 121 const char * const mi_lttng_loglevel_str_jul_finest = "JUL_FINEST";
 122 const char * const mi_lttng_loglevel_str_jul_info = "JUL_INFO";
 123 const char * const mi_lttng_loglevel_str_jul_off = "JUL_OFF";
 124 const char * const mi_lttng_loglevel_str_jul_severe = "JUL_SEVERE";
 125 const char * const mi_lttng_loglevel_str_jul_warning = "JUL_WARNING";
 126
 127 /* String related to loglevel LOG4J */
 128 const char * const mi_lttng_loglevel_str_log4j_off = "LOG4J_OFF";
 129 const char * const mi_lttng_loglevel_str_log4j_fatal = "LOG4J_FATAL";
 130 const char * const mi_lttng_loglevel_str_log4j_error = "LOG4J_ERROR";
 131 const char * const mi_lttng_loglevel_str_log4j_warn = "LOG4J_WARN";
 132 const char * const mi_lttng_loglevel_str_log4j_info = "LOG4J_INFO";
 133 const char * const mi_lttng_loglevel_str_log4j_debug = "LOG4J_DEBUG";
 134 const char * const mi_lttng_loglevel_str_log4j_trace = "LOG4J_TRACE";
 135 const char * const mi_lttng_loglevel_str_log4j_all = "LOG4J_ALL";
 136
 137 /* String related to loglevel Python */
 138 const char * const mi_lttng_loglevel_str_python_critical = "PYTHON_CRITICAL";
 139 const char * const mi_lttng_loglevel_str_python_error = "PYTHON_ERROR";
 140 const char * const mi_lttng_loglevel_str_python_warning = "PYTHON_WARNING";
 141 const char * const mi_lttng_loglevel_str_python_info = "PYTHON_INFO";
 142 const char * const mi_lttng_loglevel_str_python_debug = "PYTHON_DEBUG";
 143 const char * const mi_lttng_loglevel_str_python_notset = "PYTHON_NOTSET";
 144
 145 /* String related to loglevel type */
 146 const char * const mi_lttng_loglevel_type_all = "ALL";
 147 const char * const mi_lttng_loglevel_type_range = "RANGE";
 148 const char * const mi_lttng_loglevel_type_single = "SINGLE";
 149 const char * const mi_lttng_loglevel_type_unknown = "UNKNOWN";
 150
 151 /* String related to lttng_calibrate */
 152 const char * const mi_lttng_element_calibrate = "calibrate";
 153 const char * const mi_lttng_element_calibrate_function = "FUNCTION";
 154
 155 /* String related to a lttng_snapshot_output */
 156 const char * const mi_lttng_element_snapshot_ctrl_url = "ctrl_url";
 157 const char * const mi_lttng_element_snapshot_data_url = "data_url";
 158 const char * const mi_lttng_element_snapshot_max_size = "max_size";
 159 const char * const mi_lttng_element_snapshot_n_ptr = "n_ptr";
 160 const char * const mi_lttng_element_snapshot_session_name = "session_name";
 161 const char * const mi_lttng_element_snapshots = "snapshots";
 162
 163 /* String related to track/untrack command */
 164 const char * const mi_lttng_element_track_untrack_all_wildcard = "*";
 165
 166
 167 /* This is a merge of jul loglevel and regular loglevel
 168  * Those should never overlap by definition
 169  * (see struct lttng_event loglevel)
 170  */
 171 LTTNG_HIDDEN
 172 const char *mi_lttng_loglevel_string(int value, enum lttng_domain_type domain)
 173 {
 174         switch (domain) {
 175         case LTTNG_DOMAIN_KERNEL:
 176         case LTTNG_DOMAIN_UST:
 177                 switch (value) {
 178                 case -1:
 179                         return mi_lttng_element_empty;
 180                 case LTTNG_LOGLEVEL_EMERG:
 181                         return mi_lttng_loglevel_str_emerg;
 182                 case LTTNG_LOGLEVEL_ALERT:
 183                         return mi_lttng_loglevel_str_alert;
 184                 case LTTNG_LOGLEVEL_CRIT:
 185                         return mi_lttng_loglevel_str_crit;
 186                 case LTTNG_LOGLEVEL_ERR:
 187                         return mi_lttng_loglevel_str_err;
 188                 case LTTNG_LOGLEVEL_WARNING:
 189                         return mi_lttng_loglevel_str_warning;
 190                 case LTTNG_LOGLEVEL_NOTICE:
 191                         return mi_lttng_loglevel_str_notice;
 192                 case LTTNG_LOGLEVEL_INFO:
 193                         return mi_lttng_loglevel_str_info;
 194                 case LTTNG_LOGLEVEL_DEBUG_SYSTEM:
 195                         return mi_lttng_loglevel_str_debug_system;
 196                 case LTTNG_LOGLEVEL_DEBUG_PROGRAM:
 197                         return mi_lttng_loglevel_str_debug_program;
 198                 case LTTNG_LOGLEVEL_DEBUG_PROCESS:
 199                         return mi_lttng_loglevel_str_debug_process;
 200                 case LTTNG_LOGLEVEL_DEBUG_MODULE:
 201                         return mi_lttng_loglevel_str_debug_module;
 202                 case LTTNG_LOGLEVEL_DEBUG_UNIT:
 203                         return mi_lttng_loglevel_str_debug_unit;
 204                 case LTTNG_LOGLEVEL_DEBUG_FUNCTION:
 205                         return mi_lttng_loglevel_str_debug_function;
 206                 case LTTNG_LOGLEVEL_DEBUG_LINE:
 207                         return mi_lttng_loglevel_str_debug_line;
 208                 case LTTNG_LOGLEVEL_DEBUG:
 209                         return mi_lttng_loglevel_str_debug;
 210                 default:
 211                         return mi_lttng_loglevel_str_unknown;
 212                 }
 213                 break;
 214         case LTTNG_DOMAIN_LOG4J:
 215                 switch (value) {
 216                 case -1:
 217                         return mi_lttng_element_empty;
 218                 case LTTNG_LOGLEVEL_LOG4J_OFF:
 219                         return mi_lttng_loglevel_str_log4j_off;
 220                 case LTTNG_LOGLEVEL_LOG4J_FATAL:
 221                         return mi_lttng_loglevel_str_log4j_fatal;
 222                 case LTTNG_LOGLEVEL_LOG4J_ERROR:
 223                         return mi_lttng_loglevel_str_log4j_error;
 224                 case LTTNG_LOGLEVEL_LOG4J_WARN:
 225                         return mi_lttng_loglevel_str_log4j_warn;
 226                 case LTTNG_LOGLEVEL_LOG4J_INFO:
 227                         return mi_lttng_loglevel_str_log4j_info;
 228                 case LTTNG_LOGLEVEL_LOG4J_DEBUG:
 229                         return mi_lttng_loglevel_str_log4j_debug;
 230                 case LTTNG_LOGLEVEL_LOG4J_TRACE:
 231                         return mi_lttng_loglevel_str_log4j_trace;
 232                 case LTTNG_LOGLEVEL_LOG4J_ALL:
 233                         return mi_lttng_loglevel_str_log4j_all;
 234                 default:
 235                         return mi_lttng_loglevel_str_unknown;
 236                 }
 237                 break;
 238         case LTTNG_DOMAIN_JUL:
 239                 switch (value) {
 240                 case -1:
 241                         return mi_lttng_element_empty;
 242                 case LTTNG_LOGLEVEL_JUL_OFF:
 243                         return mi_lttng_loglevel_str_jul_off;
 244                 case LTTNG_LOGLEVEL_JUL_SEVERE:
 245                         return mi_lttng_loglevel_str_jul_severe;
 246                 case LTTNG_LOGLEVEL_JUL_WARNING:
 247                         return mi_lttng_loglevel_str_jul_warning;
 248                 case LTTNG_LOGLEVEL_JUL_INFO:
 249                         return mi_lttng_loglevel_str_jul_info;
 250                 case LTTNG_LOGLEVEL_JUL_CONFIG:
 251                         return mi_lttng_loglevel_str_jul_config;
 252                 case LTTNG_LOGLEVEL_JUL_FINE:
 253                         return mi_lttng_loglevel_str_jul_fine;
 254                 case LTTNG_LOGLEVEL_JUL_FINER:
 255                         return mi_lttng_loglevel_str_jul_finer;
 256                 case LTTNG_LOGLEVEL_JUL_FINEST:
 257                         return mi_lttng_loglevel_str_jul_finest;
 258                 case LTTNG_LOGLEVEL_JUL_ALL:
 259                         return mi_lttng_loglevel_str_jul_all;
 260                 default:
 261                         return mi_lttng_loglevel_str_unknown;
 262                 }
 263                 break;
 264         case LTTNG_DOMAIN_PYTHON:
 265                 switch (value) {
 266                 case LTTNG_LOGLEVEL_PYTHON_CRITICAL:
 267                         return mi_lttng_loglevel_str_python_critical;
 268                 case LTTNG_LOGLEVEL_PYTHON_ERROR:
 269                         return mi_lttng_loglevel_str_python_error;
 270                 case LTTNG_LOGLEVEL_PYTHON_WARNING:
 271                         return mi_lttng_loglevel_str_python_warning;
 272                 case LTTNG_LOGLEVEL_PYTHON_INFO:
 273                         return mi_lttng_loglevel_str_python_info;
 274                 case LTTNG_LOGLEVEL_PYTHON_DEBUG:
 275                         return mi_lttng_loglevel_str_python_debug;
 276                 case LTTNG_LOGLEVEL_PYTHON_NOTSET:
 277                         return mi_lttng_loglevel_str_python_notset;
 278                 default:
 279                         return mi_lttng_loglevel_str_unknown;
 280                 }
 281                 break;
 282         }
 283
 284         /* Reaching this means the domain is unknown. */
 285         return mi_lttng_loglevel_str_unknown;
 286 }
 287
 288 LTTNG_HIDDEN
 289 const char *mi_lttng_logleveltype_string(enum lttng_loglevel_type value)
 290 {
 291         switch (value) {
 292         case LTTNG_EVENT_LOGLEVEL_ALL:
 293                 return mi_lttng_loglevel_type_all;
 294         case LTTNG_EVENT_LOGLEVEL_RANGE:
 295                 return mi_lttng_loglevel_type_range;
 296         case LTTNG_EVENT_LOGLEVEL_SINGLE:
 297                 return mi_lttng_loglevel_type_single;
 298         default:
 299                 return mi_lttng_loglevel_type_unknown;
 300         }
 301 }
 302
 303 LTTNG_HIDDEN
 304 const char *mi_lttng_eventtype_string(enum lttng_event_type value)
 305 {
 306         switch (value) {
 307         case LTTNG_EVENT_ALL:
 308                 return config_event_type_all;
 309         case LTTNG_EVENT_TRACEPOINT:
 310                 return config_event_type_tracepoint;
 311         case LTTNG_EVENT_PROBE:
 312                 return config_event_type_probe;
 313         case LTTNG_EVENT_FUNCTION:
 314                 return config_event_type_function;
 315         case LTTNG_EVENT_FUNCTION_ENTRY:
 316                 return config_event_type_function_entry;
 317         case LTTNG_EVENT_SYSCALL:
 318                 return config_event_type_syscall;
 319         case LTTNG_EVENT_NOOP:
 320                 return config_event_type_noop;
 321         default:
 322                 return mi_lttng_element_empty;
 323         }
 324 }
 325
 326 LTTNG_HIDDEN
 327 const char *mi_lttng_event_contexttype_string(enum lttng_event_context_type val)
 328 {
 329         switch (val) {
 330         case LTTNG_EVENT_CONTEXT_PID:
 331                 return config_event_context_pid;
 332         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
 333                 return mi_lttng_context_type_perf_counter;
 334         case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
 335                 return mi_lttng_context_type_perf_thread_counter;
 336         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
 337                 return mi_lttng_context_type_perf_cpu_counter;
 338         case LTTNG_EVENT_CONTEXT_PROCNAME:
 339                 return config_event_context_procname;
 340         case LTTNG_EVENT_CONTEXT_PRIO:
 341                 return config_event_context_prio;
 342         case LTTNG_EVENT_CONTEXT_NICE:
 343                 return config_event_context_nice;
 344         case LTTNG_EVENT_CONTEXT_VPID:
 345                 return config_event_context_vpid;
 346         case LTTNG_EVENT_CONTEXT_TID:
 347                 return config_event_context_tid;
 348         case LTTNG_EVENT_CONTEXT_VTID:
 349                 return config_event_context_vtid;
 350         case LTTNG_EVENT_CONTEXT_PPID:
 351                 return config_event_context_ppid;
 352         case LTTNG_EVENT_CONTEXT_VPPID:
 353                 return config_event_context_vppid;
 354         case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
 355                 return config_event_context_pthread_id;
 356         case LTTNG_EVENT_CONTEXT_HOSTNAME:
 357                 return config_event_context_hostname;
 358         case LTTNG_EVENT_CONTEXT_IP:
 359                 return config_event_context_ip;
 360         default:
 361                 return NULL;
 362         }
 363 }
 364
 365 LTTNG_HIDDEN
 366 const char *mi_lttng_eventfieldtype_string(enum lttng_event_field_type val)
 367 {
 368         switch (val) {
 369         case(LTTNG_EVENT_FIELD_INTEGER):
 370                 return mi_lttng_element_type_integer;
 371         case(LTTNG_EVENT_FIELD_ENUM):
 372                 return mi_lttng_element_type_enum;
 373         case(LTTNG_EVENT_FIELD_FLOAT):
 374                 return mi_lttng_element_type_float;
 375         case(LTTNG_EVENT_FIELD_STRING):
 376                 return mi_lttng_element_type_string;
 377         default:
 378                 return mi_lttng_element_type_other;
 379         }
 380 }
 381
 382 LTTNG_HIDDEN
 383 const char *mi_lttng_domaintype_string(enum lttng_domain_type value)
 384 {
 385         /* Note: This is a *duplicate* of get_domain_str from bin/lttng/utils.c */
 386         switch (value) {
 387         case LTTNG_DOMAIN_KERNEL:
 388                 return config_domain_type_kernel;
 389         case LTTNG_DOMAIN_UST:
 390                 return config_domain_type_ust;
 391         case LTTNG_DOMAIN_JUL:
 392                 return config_domain_type_jul;
 393         case LTTNG_DOMAIN_LOG4J:
 394                 return config_domain_type_log4j;
 395         case LTTNG_DOMAIN_PYTHON:
 396                 return config_domain_type_python;
 397         default:
 398                 /* Should not have an unknown domain */
 399                 assert(0);
 400         }
 401 }
 402
 403 LTTNG_HIDDEN
 404 const char *mi_lttng_buffertype_string(enum lttng_buffer_type value)
 405 {
 406         switch (value) {
 407         case LTTNG_BUFFER_PER_PID:
 408                 return config_buffer_type_per_pid;
 409         case LTTNG_BUFFER_PER_UID:
 410                 return config_buffer_type_per_uid;
 411         case LTTNG_BUFFER_GLOBAL:
 412                 return config_buffer_type_global;
 413         default:
 414                 /* Should not have an unknow buffer type */
 415                 assert(0);
 416         }
 417 }
 418
 419 LTTNG_HIDDEN
 420 const char *mi_lttng_calibratetype_string(enum lttng_calibrate_type val)
 421 {
 422         const char *ret;
 423
 424         switch (val) {
 425         case LTTNG_CALIBRATE_FUNCTION:
 426                 ret = mi_lttng_element_calibrate_function;
 427                 break;
 428         default:
 429                 ret = mi_lttng_element_empty;
 430                 break;
 431         }
 432         return ret;
 433 }
 434
 435 LTTNG_HIDDEN
 436 struct mi_writer *mi_lttng_writer_create(int fd_output, int mi_output_type)
 437 {
 438         struct mi_writer *mi_writer;
 439
 440         mi_writer = zmalloc(sizeof(struct mi_writer));
 441         if (!mi_writer) {
 442                 PERROR("zmalloc mi_writer_create");
 443                 goto end;
 444         }
 445         if (mi_output_type == LTTNG_MI_XML) {
 446                 mi_writer->writer = config_writer_create(fd_output, 0);
 447                 if (!mi_writer->writer) {
 448                         goto err_destroy;
 449                 }
 450                 mi_writer->type = LTTNG_MI_XML;
 451         } else {
 452                 goto err_destroy;
 453         }
 454
 455 end:
 456         return mi_writer;
 457
 458 err_destroy:
 459         free(mi_writer);
 460         return NULL;
 461 }
 462
 463 LTTNG_HIDDEN
 464 int mi_lttng_writer_destroy(struct mi_writer *writer)
 465 {
 466         int ret;
 467
 468         if (!writer) {
 469                 ret = -EINVAL;
 470                 goto end;
 471         }
 472
 473         ret = config_writer_destroy(writer->writer);
 474         if (ret < 0) {
 475                 goto end;
 476         }
 477
 478         free(writer);
 479 end:
 480         return ret;
 481 }
 482
 483 LTTNG_HIDDEN
 484 int mi_lttng_writer_command_open(struct mi_writer *writer, const char *command)
 485 {
 486         int ret;
 487
 488         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_command);
 489         if (ret) {
 490                 goto end;
 491         }
 492         ret = mi_lttng_writer_write_element_string(writer,
 493                         mi_lttng_element_command_name, command);
 494 end:
 495         return ret;
 496 }
 497
 498 LTTNG_HIDDEN
 499 int mi_lttng_writer_command_close(struct mi_writer *writer)
 500 {
 501         return mi_lttng_writer_close_element(writer);
 502 }
 503
 504 LTTNG_HIDDEN
 505 int mi_lttng_writer_open_element(struct mi_writer *writer,
 506                 const char *element_name)
 507 {
 508         return config_writer_open_element(writer->writer, element_name);
 509 }
 510
 511 LTTNG_HIDDEN
 512 int mi_lttng_writer_close_element(struct mi_writer *writer)
 513 {
 514         return config_writer_close_element(writer->writer);
 515 }
 516
 517 LTTNG_HIDDEN
 518 int mi_lttng_close_multi_element(struct mi_writer *writer,
 519                 unsigned int nb_element)
 520 {
 521         int ret, i;
 522
 523         if (nb_element < 1) {
 524                 ret = 0;
 525                 goto end;
 526         }
 527         for (i = 0; i < nb_element; i++) {
 528                 ret = mi_lttng_writer_close_element(writer);
 529                 if (ret) {
 530                         goto end;
 531                 }
 532         }
 533 end:
 534         return ret;
 535 }
 536
 537 LTTNG_HIDDEN
 538 int mi_lttng_writer_write_element_unsigned_int(struct mi_writer *writer,
 539                 const char *element_name, uint64_t value)
 540 {
 541         return config_writer_write_element_unsigned_int(writer->writer,
 542                         element_name, value);
 543 }
 544
 545 LTTNG_HIDDEN
 546 int mi_lttng_writer_write_element_signed_int(struct mi_writer *writer,
 547                 const char *element_name, int64_t value)
 548 {
 549         return config_writer_write_element_signed_int(writer->writer,
 550                         element_name, value);
 551 }
 552
 553 LTTNG_HIDDEN
 554 int mi_lttng_writer_write_element_bool(struct mi_writer *writer,
 555                 const char *element_name, int value)
 556 {
 557         return config_writer_write_element_bool(writer->writer,
 558                         element_name, value);
 559 }
 560
 561 LTTNG_HIDDEN
 562 int mi_lttng_writer_write_element_string(struct mi_writer *writer,
 563                 const char *element_name, const char *value)
 564 {
 565         return config_writer_write_element_string(writer->writer,
 566                         element_name, value);
 567 }
 568
 569 LTTNG_HIDDEN
 570 int mi_lttng_version(struct mi_writer *writer, struct mi_lttng_version *version,
 571         const char *lttng_description, const char *lttng_license)
 572 {
 573         int ret;
 574
 575         /* Open version */
 576         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_version);
 577         if (ret) {
 578                 goto end;
 579         }
 580
 581         /* Version string (contain info like rc etc.) */
 582         ret = mi_lttng_writer_write_element_string(writer,
 583                         mi_lttng_element_version_str, version->version);
 584         if (ret) {
 585                 goto end;
 586         }
 587
 588         /* Major version number */
 589         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 590                         mi_lttng_element_version_major, version->version_major);
 591         if (ret) {
 592                 goto end;
 593         }
 594
 595         /* Minor version number */
 596         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 597                         mi_lttng_element_version_minor, version->version_minor);
 598         if (ret) {
 599                 goto end;
 600         }
 601
 602         /* Commit version number */
 603         ret = mi_lttng_writer_write_element_string(writer,
 604                         mi_lttng_element_version_commit, version->version_commit);
 605         if (ret) {
 606                 goto end;
 607         }
 608
 609         /* Patch number */
 610         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 611                         mi_lttng_element_version_patch_level, version->version_patchlevel);
 612         if (ret) {
 613                 goto end;
 614         }
 615
 616         /* Name of the version */
 617         ret = mi_lttng_writer_write_element_string(writer,
 618                         config_element_name, version->version_name);
 619         if (ret) {
 620                 goto end;
 621         }
 622
 623         /* Description mostly related to beer... */
 624         ret = mi_lttng_writer_write_element_string(writer,
 625                         mi_lttng_element_version_description, lttng_description);
 626         if (ret) {
 627                 goto end;
 628         }
 629
 630         /* url */
 631         ret = mi_lttng_writer_write_element_string(writer,
 632                         mi_lttng_element_version_web, version->package_url);
 633         if (ret) {
 634                 goto end;
 635         }
 636
 637         /* License: free as in free beer...no...*speech* */
 638         ret = mi_lttng_writer_write_element_string(writer,
 639                         mi_lttng_element_version_license, lttng_license);
 640         if (ret) {
 641                 goto end;
 642         }
 643
 644         /* Close version element */
 645         ret = mi_lttng_writer_close_element(writer);
 646
 647 end:
 648         return ret;
 649 }
 650
 651 LTTNG_HIDDEN
 652 int mi_lttng_sessions_open(struct mi_writer *writer)
 653 {
 654         return mi_lttng_writer_open_element(writer, config_element_sessions);
 655 }
 656
 657 LTTNG_HIDDEN
 658 int mi_lttng_session(struct mi_writer *writer,
 659                 struct lttng_session *session, int is_open)
 660 {
 661         int ret;
 662
 663         assert(session);
 664
 665         /* Open sessions element */
 666         ret = mi_lttng_writer_open_element(writer,
 667                         config_element_session);
 668         if (ret) {
 669                 goto end;
 670         }
 671
 672         /* Name of the session */
 673         ret = mi_lttng_writer_write_element_string(writer,
 674                         config_element_name, session->name);
 675         if (ret) {
 676                 goto end;
 677         }
 678
 679         /* Path */
 680         ret = mi_lttng_writer_write_element_string(writer,
 681                         config_element_path, session->path);
 682         if (ret) {
 683                 goto end;
 684         }
 685
 686         /* Enabled ? */
 687         ret = mi_lttng_writer_write_element_bool(writer,
 688                         config_element_enabled, session->enabled);
 689         if (ret) {
 690                 goto end;
 691         }
 692
 693         /* Snapshot mode */
 694         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 695                         config_element_snapshot_mode, session->snapshot_mode);
 696         if (ret) {
 697                 goto end;
 698         }
 699
 700         /* Live timer interval in usec */
 701         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 702                         config_element_live_timer_interval,
 703                         session->live_timer_interval);
 704         if (ret) {
 705                 goto end;
 706         }
 707
 708         if (!is_open) {
 709                 /* Closing session element */
 710                 ret = mi_lttng_writer_close_element(writer);
 711         }
 712 end:
 713         return ret;
 714
 715 }
 716
 717 LTTNG_HIDDEN
 718 int mi_lttng_domains_open(struct mi_writer *writer)
 719 {
 720         return mi_lttng_writer_open_element(writer, config_element_domains);
 721 }
 722
 723 LTTNG_HIDDEN
 724 int mi_lttng_domain(struct mi_writer *writer,
 725                 struct lttng_domain *domain, int is_open)
 726 {
 727         int ret = 0;
 728         const char *str_domain;
 729         const char *str_buffer;
 730
 731         assert(domain);
 732
 733         /* Open domain element */
 734         ret = mi_lttng_writer_open_element(writer, config_element_domain);
 735         if (ret) {
 736                 goto end;
 737         }
 738
 739         /* Domain Type */
 740         str_domain = mi_lttng_domaintype_string(domain->type);
 741         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
 742                         str_domain);
 743         if (ret) {
 744                 goto end;
 745         }
 746
 747         /* Buffer Type */
 748         str_buffer= mi_lttng_buffertype_string(domain->buf_type);
 749         ret = mi_lttng_writer_write_element_string(writer,
 750                         config_element_buffer_type, str_buffer);
 751         if (ret) {
 752                 goto end;
 753         }
 754
 755         /* TODO: union  attr
 756          * This union is not currently used and was added for
 757          * future ust domain support.
 758          * Date: 25-06-2014
 759          * */
 760
 761         if (!is_open) {
 762                 /* Closing domain element */
 763                 ret = mi_lttng_writer_close_element(writer);
 764         }
 765
 766 end:
 767         return ret;
 768
 769 }
 770
 771 LTTNG_HIDDEN
 772 int mi_lttng_channels_open(struct mi_writer *writer)
 773 {
 774         return mi_lttng_writer_open_element(writer, config_element_channels);
 775 }
 776
 777 LTTNG_HIDDEN
 778 int mi_lttng_channel(struct mi_writer *writer,
 779                 struct lttng_channel *channel, int is_open)
 780 {
 781         int ret = 0;
 782
 783         assert(channel);
 784
 785         /* Opening channel element */
 786         ret = mi_lttng_writer_open_element(writer, config_element_channel);
 787         if (ret) {
 788                 goto end;
 789         }
 790
 791         /* Name */
 792         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
 793                         channel->name);
 794         if (ret) {
 795                 goto end;
 796         }
 797
 798         /* Enabled ? */
 799         ret = mi_lttng_writer_write_element_bool(writer,
 800                         config_element_enabled, channel->enabled);
 801         if (ret) {
 802                 goto end;
 803         }
 804
 805         /* Attribute */
 806         ret = mi_lttng_channel_attr(writer, &channel->attr);
 807         if (ret) {
 808                 goto end;
 809         }
 810
 811         if (!is_open) {
 812                 /* Closing channel element */
 813                 ret = mi_lttng_writer_close_element(writer);
 814                 if (ret) {
 815                         goto end;
 816                 }
 817         }
 818 end:
 819         return ret;
 820 }
 821
 822 LTTNG_HIDDEN
 823 int mi_lttng_channel_attr(struct mi_writer *writer,
 824                 struct lttng_channel_attr *attr)
 825 {
 826         int ret = 0;
 827
 828         assert(attr);
 829
 830         /* Opening Attributes */
 831         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
 832         if (ret) {
 833                 goto end;
 834         }
 835
 836         /* Overwrite */
 837         ret = mi_lttng_writer_write_element_string(writer,
 838                 config_element_overwrite_mode,
 839                 attr->overwrite ? config_overwrite_mode_overwrite :
 840                         config_overwrite_mode_discard);
 841         if (ret) {
 842                 goto end;
 843         }
 844
 845         /* Sub buffer size in byte */
 846         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 847                 config_element_subbuf_size, attr->subbuf_size);
 848         if (ret) {
 849                 goto end;
 850         }
 851
 852         /* Number of subbuffer (power of two) */
 853         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 854                 config_element_num_subbuf,
 855                 attr->num_subbuf);
 856         if (ret) {
 857                 goto end;
 858         }
 859
 860         /* Switch timer interval in usec */
 861         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 862                 config_element_switch_timer_interval,
 863                 attr->switch_timer_interval);
 864         if (ret) {
 865                 goto end;
 866         }
 867
 868         /* Read timer interval in usec */
 869         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 870                 config_element_read_timer_interval,
 871                 attr->read_timer_interval);
 872         if (ret) {
 873                 goto end;
 874         }
 875
 876         /* Event output */
 877         ret = mi_lttng_writer_write_element_string(writer,
 878                 config_element_output_type,
 879                 attr->output == LTTNG_EVENT_SPLICE ?
 880                 config_output_type_splice : config_output_type_mmap);
 881         if (ret) {
 882                 goto end;
 883         }
 884
 885         /* Tracefile size in bytes */
 886         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 887                 config_element_tracefile_size, attr->tracefile_size);
 888         if (ret) {
 889                 goto end;
 890         }
 891
 892         /* Count of tracefiles */
 893         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 894                 config_element_tracefile_count,
 895                 attr->tracefile_count);
 896         if (ret) {
 897                 goto end;
 898         }
 899
 900         /* Live timer interval in usec*/
 901         ret = mi_lttng_writer_write_element_unsigned_int(writer,
 902                 config_element_live_timer_interval,
 903                 attr->live_timer_interval);
 904         if (ret) {
 905                 goto end;
 906         }
 907
 908         /* Closing attributes */
 909         ret = mi_lttng_writer_close_element(writer);
 910         if (ret) {
 911                 goto end;
 912         }
 913 end:
 914         return ret;
 915
 916 }
 917
 918 LTTNG_HIDDEN
 919 int mi_lttng_event_common_attributes(struct mi_writer *writer,
 920                 struct lttng_event *event)
 921 {
 922         int ret;
 923
 924         /* Open event element */
 925         ret = mi_lttng_writer_open_element(writer, config_element_event);
 926         if (ret) {
 927                 goto end;
 928         }
 929
 930         /* Event name */
 931         ret = mi_lttng_writer_write_element_string(writer,
 932                         config_element_name, event->name);
 933         if (ret) {
 934                 goto end;
 935         }
 936
 937         /* Event type */
 938         ret = mi_lttng_writer_write_element_string(writer,
 939                         config_element_type, mi_lttng_eventtype_string(event->type));
 940         if (ret) {
 941                 goto end;
 942         }
 943
 944         /* Is event enabled */
 945         ret = mi_lttng_writer_write_element_bool(writer,
 946                         config_element_enabled, event->enabled);
 947         if (ret) {
 948                 goto end;
 949         }
 950
 951         /* Event filter enabled? */
 952         ret = mi_lttng_writer_write_element_bool(writer,
 953                         config_element_filter, event->filter);
 954
 955 end:
 956         return ret;
 957 }
 958
 959 LTTNG_HIDDEN
 960 int mi_lttng_event_tracepoint_loglevel(struct mi_writer *writer,
 961                 struct lttng_event *event, enum lttng_domain_type domain)
 962 {
 963         int ret;
 964
 965         /* Event loglevel */
 966         ret = mi_lttng_writer_write_element_string(writer,
 967                         config_element_loglevel,
 968                         mi_lttng_loglevel_string(event->loglevel, domain));
 969         if (ret) {
 970                 goto end;
 971         }
 972
 973         /* Log level type */
 974         ret = mi_lttng_writer_write_element_string(writer,
 975                         config_element_loglevel_type,
 976                         mi_lttng_logleveltype_string(event->loglevel_type));
 977         if (ret) {
 978                 goto end;
 979         }
 980
 981         /* event exclusion filter */
 982         ret = mi_lttng_writer_write_element_bool(writer,
 983                         config_element_exclusion, event->exclusion);
 984         if (ret) {
 985                 goto end;
 986         }
 987
 988 end:
 989         return ret;
 990 }
 991
 992 LTTNG_HIDDEN
 993 int mi_lttng_event_tracepoint_no_loglevel(struct mi_writer *writer,
 994                 struct lttng_event *event)
 995 {
 996         /* event exclusion filter */
 997         return mi_lttng_writer_write_element_bool(writer,
 998                         config_element_exclusion, event->exclusion);
 999 }
1000
1001 LTTNG_HIDDEN
1002 int mi_lttng_event_function_probe(struct mi_writer *writer,
1003                 struct lttng_event *event)
1004 {
1005         int ret;
1006
1007         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1008         if (ret) {
1009                 goto end;
1010         }
1011
1012         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1013         if (ret) {
1014                 goto end;
1015         }
1016
1017         if (event->attr.probe.addr != 0) {
1018                 /* event probe address */
1019                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1020                                 config_element_address, event->attr.probe.addr);
1021                 if (ret) {
1022                         goto end;
1023                 }
1024         } else {
1025                 /* event probe offset */
1026                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1027                                 config_element_offset, event->attr.probe.offset);
1028                 if (ret) {
1029                         goto end;
1030                 }
1031
1032                 /* event probe symbol_name */
1033                 ret = mi_lttng_writer_write_element_string(writer,
1034                                 config_element_symbol_name, event->attr.probe.symbol_name);
1035                 if (ret) {
1036                         goto end;
1037                 }
1038         }
1039
1040         /* Close probe_attributes and attributes */
1041         ret = mi_lttng_close_multi_element(writer, 2);
1042 end:
1043         return ret;
1044 }
1045
1046 LTTNG_HIDDEN
1047 int mi_lttng_event_function_entry(struct mi_writer *writer,
1048                 struct lttng_event *event)
1049 {
1050         int ret;
1051
1052         ret = mi_lttng_writer_open_element(writer, config_element_attributes);
1053         if (ret) {
1054                 goto end;
1055         }
1056
1057         ret = mi_lttng_writer_open_element(writer, config_element_probe_attributes);
1058         if (ret) {
1059                 goto end;
1060         }
1061
1062         /* event probe symbol_name */
1063         ret = mi_lttng_writer_write_element_string(writer,
1064                         config_element_symbol_name, event->attr.ftrace.symbol_name);
1065         if (ret) {
1066                 goto end;
1067         }
1068
1069         /* Close function_attributes and attributes */
1070         ret = mi_lttng_close_multi_element(writer, 2);
1071 end:
1072         return ret;
1073 }
1074
1075 LTTNG_HIDDEN
1076 int mi_lttng_events_open(struct mi_writer *writer)
1077 {
1078         return mi_lttng_writer_open_element(writer, config_element_events);
1079 }
1080
1081 LTTNG_HIDDEN
1082 int mi_lttng_event(struct mi_writer *writer,
1083                 struct lttng_event *event, int is_open, enum lttng_domain_type domain)
1084 {
1085         int ret;
1086
1087         ret = mi_lttng_event_common_attributes(writer, event);
1088         if (ret) {
1089                 goto end;
1090         }
1091
1092         switch (event->type) {
1093         case LTTNG_EVENT_TRACEPOINT:
1094         {
1095                 if (event->loglevel != -1) {
1096                         ret = mi_lttng_event_tracepoint_loglevel(writer, event, domain);
1097                 } else {
1098                         ret = mi_lttng_event_tracepoint_no_loglevel(writer, event);
1099                 }
1100                 break;
1101         }
1102         case LTTNG_EVENT_FUNCTION:
1103                 /* Fallthrough */
1104         case LTTNG_EVENT_PROBE:
1105                 ret = mi_lttng_event_function_probe(writer, event);
1106                 break;
1107         case LTTNG_EVENT_FUNCTION_ENTRY:
1108                 ret = mi_lttng_event_function_entry(writer, event);
1109                 break;
1110         case LTTNG_EVENT_ALL:
1111                 /* Fallthrough */
1112         default:
1113                 break;
1114         }
1115
1116         if (!is_open) {
1117                 ret = mi_lttng_writer_close_element(writer);
1118         }
1119
1120 end:
1121         return ret;
1122 }
1123
1124 LTTNG_HIDDEN
1125 int mi_lttng_trackers_open(struct mi_writer *writer)
1126 {
1127         return mi_lttng_writer_open_element(writer, config_element_trackers);
1128 }
1129
1130 LTTNG_HIDDEN
1131 int mi_lttng_pid_tracker_open(struct mi_writer *writer)
1132 {
1133         int ret;
1134
1135         /* Open element pid_tracker */
1136         ret = mi_lttng_writer_open_element(writer, config_element_pid_tracker);
1137         if (ret) {
1138                 goto end;
1139         }
1140
1141         /* Open targets element */
1142         ret = mi_lttng_targets_open(writer);
1143 end:
1144         return ret;
1145 }
1146
1147 LTTNG_HIDDEN
1148 int mi_lttng_pids_open(struct mi_writer *writer)
1149 {
1150         return mi_lttng_writer_open_element(writer, config_element_pids);
1151 }
1152
1153 /*
1154  * TODO: move the listing of pid for user agent to process semantic on
1155  * mi api bump. The use of process element break the mi api.
1156  */
1157 LTTNG_HIDDEN
1158 int mi_lttng_pid(struct mi_writer *writer, pid_t pid , const char *name,
1159                 int is_open)
1160 {
1161         int ret;
1162
1163         /* Open pid process */
1164         ret = mi_lttng_writer_open_element(writer, config_element_pid);
1165         if (ret) {
1166                 goto end;
1167         }
1168
1169         /* Writing pid number */
1170         ret = mi_lttng_writer_write_element_signed_int(writer,
1171                         mi_lttng_element_pid_id, (int)pid);
1172         if (ret) {
1173                 goto end;
1174         }
1175
1176         /* Writing name of the process */
1177         if (name) {
1178                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1179                                 name);
1180                 if (ret) {
1181                         goto end;
1182                 }
1183         }
1184
1185         if (!is_open) {
1186                 /* Closing Pid */
1187                 ret = mi_lttng_writer_close_element(writer);
1188         }
1189
1190 end:
1191         return ret;
1192 }
1193
1194 LTTNG_HIDDEN
1195 int mi_lttng_targets_open(struct mi_writer *writer)
1196 {
1197         return mi_lttng_writer_open_element(writer,
1198                         config_element_targets);
1199 }
1200
1201 LTTNG_HIDDEN
1202 int mi_lttng_pid_target(struct mi_writer *writer, pid_t pid, int is_open)
1203 {
1204         int ret;
1205
1206         ret = mi_lttng_writer_open_element(writer,
1207                         config_element_target_pid);
1208         if (ret) {
1209                 goto end;
1210         }
1211
1212         /* Writing pid number
1213          * Special case for element all on track untrack command
1214          * All pid is represented as wildcard *
1215          */
1216         if ((int) pid == -1) {
1217                 ret = mi_lttng_writer_write_element_string(writer,
1218                                 config_element_pid,
1219                                 mi_lttng_element_track_untrack_all_wildcard);
1220         } else {
1221                 ret = mi_lttng_writer_write_element_signed_int(writer,
1222                                 config_element_pid, (int) pid);
1223         }
1224         if (ret) {
1225                 goto end;
1226         }
1227
1228         if (!is_open) {
1229                 ret = mi_lttng_writer_close_element(writer);
1230                 if (ret) {
1231                         goto end;
1232                 }
1233         }
1234
1235 end:
1236         return ret;
1237 }
1238
1239 LTTNG_HIDDEN
1240 int mi_lttng_event_fields_open(struct mi_writer *writer)
1241 {
1242         return mi_lttng_writer_open_element(writer, mi_lttng_element_event_fields);
1243 }
1244
1245 LTTNG_HIDDEN
1246 int mi_lttng_event_field(struct mi_writer *writer,
1247                 struct lttng_event_field *field)
1248 {
1249         int ret;
1250
1251         if (!field->field_name[0]) {
1252                 ret = 0;
1253                 goto end;
1254         }
1255
1256         /* Open field */
1257         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_event_field);
1258         if (ret) {
1259                 goto end;
1260         }
1261
1262         if (!field->field_name[0]) {
1263                 goto close;
1264         }
1265
1266         /* Name */
1267         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1268                         field->field_name);
1269         if (ret) {
1270                 goto end;
1271         }
1272
1273         /* Type */
1274         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1275                         mi_lttng_eventfieldtype_string(field->type));
1276         if (ret) {
1277                 goto end;
1278         }
1279
1280         /* nowrite  */
1281         ret = mi_lttng_writer_write_element_signed_int(writer,
1282                         mi_lttng_element_nowrite, field->nowrite);
1283         if (ret) {
1284                 goto end;
1285         }
1286
1287 close:
1288         /* Close field element */
1289         ret = mi_lttng_writer_close_element(writer);
1290
1291 end:
1292         return ret;
1293 }
1294
1295 LTTNG_HIDDEN
1296 int mi_lttng_calibrate(struct mi_writer *writer,
1297                 struct lttng_calibrate *calibrate)
1298 {
1299         int ret;
1300
1301         /* Open calibrate element */
1302         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_calibrate);
1303         if (ret) {
1304                 goto end;
1305         }
1306
1307         /* Calibration type */
1308         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1309                         mi_lttng_calibratetype_string(calibrate->type));
1310         if (ret) {
1311                 goto end;
1312         }
1313
1314         /* Closing calibrate element */
1315         ret = mi_lttng_writer_close_element(writer);
1316 end:
1317         return ret;
1318 }
1319
1320 LTTNG_HIDDEN
1321 int mi_lttng_context(struct mi_writer *writer,
1322                 struct lttng_event_context *context, int is_open)
1323 {
1324         int ret;
1325         const char *type_string;
1326         struct lttng_event_perf_counter_ctx *perf_context;
1327         /* Open context */
1328         ret = mi_lttng_writer_open_element(writer , config_element_context);
1329         if (ret) {
1330                 goto end;
1331         }
1332
1333         type_string = mi_lttng_event_contexttype_string(context->ctx);
1334         if (!type_string) {
1335                 ret = -LTTNG_ERR_INVALID;
1336                 goto end;
1337         }
1338
1339         /* Print context type */
1340         ret = mi_lttng_writer_write_element_string(writer, config_element_type,
1341                         type_string);
1342
1343         /* Special case for PERF_*_COUNTER
1344          * print the lttng_event_perf_counter_ctx*/
1345         switch (context->ctx) {
1346         case LTTNG_EVENT_CONTEXT_PERF_COUNTER:
1347         case LTTNG_EVENT_CONTEXT_PERF_THREAD_COUNTER:
1348         case LTTNG_EVENT_CONTEXT_PERF_CPU_COUNTER:
1349                 perf_context = &context->u.perf_counter;
1350                 ret =  mi_lttng_perf_counter_context(writer, perf_context);
1351                 if (ret) {
1352                         goto end;
1353                 }
1354                 break;
1355         default:
1356                 break;
1357         }
1358
1359         /* Close context */
1360         if (!is_open) {
1361                 ret = mi_lttng_writer_close_element(writer);
1362         }
1363
1364 end:
1365         return ret;
1366 }
1367
1368 LTTNG_HIDDEN
1369 int mi_lttng_perf_counter_context(struct mi_writer *writer,
1370                 struct lttng_event_perf_counter_ctx  *perf_context)
1371 {
1372         int ret;
1373
1374         /* Open perf_counter_context */
1375         ret = mi_lttng_writer_open_element(writer,
1376                         mi_lttng_element_perf_counter_context);
1377         if (ret) {
1378                 goto end;
1379         }
1380
1381         /* Type */
1382         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1383                         config_element_type, perf_context->type);
1384         if (ret) {
1385                 goto end;
1386         }
1387
1388         /* Config */
1389         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1390                         config_element_config, perf_context->config);
1391         if (ret) {
1392                 goto end;
1393         }
1394
1395         /* Name of the perf counter */
1396         ret = mi_lttng_writer_write_element_string(writer,
1397                         config_element_name, perf_context->name);
1398         if (ret) {
1399                 goto end;
1400         }
1401
1402         /* Close perf_counter_context */
1403         ret = mi_lttng_writer_close_element(writer);
1404 end:
1405         return ret;
1406 }
1407
1408 LTTNG_HIDDEN
1409 int mi_lttng_snapshot_output_session_name(struct mi_writer *writer,
1410                 const char *session_name)
1411 {
1412         int ret;
1413
1414         /* Open session element */
1415         ret = mi_lttng_writer_open_element(writer, config_element_session);
1416         if (ret) {
1417                 goto end;
1418         }
1419
1420         /* Snapshot output list for current session name */
1421         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1422                         session_name);
1423         if (ret) {
1424                 goto end;
1425         }
1426
1427         /* Open element snapshots (sequence one snapshot) */
1428         ret = mi_lttng_writer_open_element(writer, mi_lttng_element_snapshots);
1429         if (ret) {
1430                 goto end;
1431         }
1432
1433 end:
1434         return ret;
1435 }
1436
1437 LTTNG_HIDDEN
1438 int mi_lttng_snapshot_list_output(struct mi_writer *writer,
1439                 struct lttng_snapshot_output *output)
1440 {
1441         int ret;
1442
1443         /* Open element snapshot output */
1444         ret = mi_lttng_writer_open_element(writer,
1445                         mi_lttng_element_command_snapshot);
1446         if (ret) {
1447                 goto end;
1448         }
1449
1450         /* ID of the snapshot output */
1451         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1452                         mi_lttng_element_id, output->id);
1453         if (ret) {
1454                 goto end;
1455         }
1456
1457         /* Name of the output */
1458         ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1459                         output->name);
1460         if (ret) {
1461                 goto end;
1462         }
1463
1464         /* Destination of the output (ctrl_url)*/
1465         ret = mi_lttng_writer_write_element_string(writer,
1466                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1467         if (ret) {
1468                 goto end;
1469         }
1470
1471         /* Destination of the output (data_url) */
1472         ret = mi_lttng_writer_write_element_string(writer,
1473                         mi_lttng_element_snapshot_data_url, output->data_url);
1474         if (ret) {
1475                 goto end;
1476         }
1477
1478         /* total size of all stream combined */
1479         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1480                         mi_lttng_element_snapshot_max_size, output->max_size);
1481         if (ret) {
1482                 goto end;
1483         }
1484
1485         /* Close snapshot output element */
1486         ret = mi_lttng_writer_close_element(writer);
1487
1488 end:
1489         return ret;
1490 }
1491
1492 LTTNG_HIDDEN
1493 int mi_lttng_snapshot_del_output(struct mi_writer *writer, int id,
1494                 const char *name, const char *current_session_name)
1495 {
1496         int ret;
1497
1498         /* Open element del_snapshot */
1499         ret = mi_lttng_writer_open_element(writer,
1500                         mi_lttng_element_command_snapshot);
1501         if (ret) {
1502                 goto end;
1503         }
1504
1505
1506         if (id != UINT32_MAX) {
1507                 /* "Snapshot output "id" successfully deleted
1508                  * for "current_session_name"
1509                  * ID of the snapshot output
1510                  */
1511                 ret = mi_lttng_writer_write_element_unsigned_int(writer,
1512                                 mi_lttng_element_id, id);
1513                 if (ret) {
1514                         goto end;
1515                 }
1516         } else {
1517                 /* "Snapshot output "name" successfully deleted
1518                  * for session "current_session_name"
1519                  * Name of the output
1520                  */
1521                 ret = mi_lttng_writer_write_element_string(writer, config_element_name,
1522                                 name);
1523                 if (ret) {
1524                         goto end;
1525                 }
1526         }
1527
1528         /* Snapshot was deleted for session "current_session_name"*/
1529         ret = mi_lttng_writer_write_element_string(writer,
1530                         mi_lttng_element_snapshot_session_name,
1531                         current_session_name);
1532         if (ret) {
1533                 goto end;
1534         }
1535
1536         /* Close snapshot element */
1537         ret = mi_lttng_writer_close_element(writer);
1538
1539 end:
1540         return ret;
1541 }
1542
1543 LTTNG_HIDDEN
1544 int mi_lttng_snapshot_add_output(struct mi_writer *writer,
1545                 const char *current_session_name, const char *n_ptr,
1546                 struct lttng_snapshot_output *output)
1547 {
1548         int ret;
1549
1550         /* Open element snapshot */
1551         ret = mi_lttng_writer_open_element(writer,
1552                         mi_lttng_element_command_snapshot);
1553         if (ret) {
1554                 goto end;
1555         }
1556
1557         /* Snapshot output id */
1558         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1559                         mi_lttng_element_id, output->id);
1560         if (ret) {
1561                 goto end;
1562         }
1563
1564         /* Snapshot output names */
1565         ret = mi_lttng_writer_write_element_string(writer,
1566                         config_element_name, n_ptr);
1567         if (ret) {
1568                 goto end;
1569         }
1570
1571         /* Destination of the output (ctrl_url)*/
1572         ret = mi_lttng_writer_write_element_string(writer,
1573                         mi_lttng_element_snapshot_ctrl_url, output->ctrl_url);
1574         if (ret) {
1575                 goto end;
1576         }
1577
1578         /* Snapshot added for session "current_session_name"*/
1579         ret = mi_lttng_writer_write_element_string(writer,
1580                         mi_lttng_element_snapshot_session_name, current_session_name);
1581         if (ret) {
1582                 goto end;
1583         }
1584
1585         /* total size of all stream combined */
1586         ret = mi_lttng_writer_write_element_unsigned_int(writer,
1587                         mi_lttng_element_snapshot_max_size, output->max_size);
1588         if (ret) {
1589                 goto end;
1590         }
1591
1592         /* Close snapshot element */
1593         ret = mi_lttng_writer_close_element(writer);
1594
1595 end:
1596         return ret;
1597 }
1598
1599 LTTNG_HIDDEN
1600 int mi_lttng_snapshot_record(struct mi_writer *writer,
1601                 const char *current_session_name, const char *url,
1602                 const char *cmdline_ctrl_url, const char *cmdline_data_url)
1603 {
1604         int ret;
1605
1606         /* Open element snapshot */
1607         ret = mi_lttng_writer_open_element(writer,
1608                         mi_lttng_element_command_snapshot);
1609         if (ret) {
1610                 goto end;
1611         }
1612
1613         /*
1614          * If a valid an URL was given, serialize it,
1615          * else take the command line data and ctrl urls*/
1616         if (url) {
1617                 /* Destination of the output (ctrl_url)*/
1618                 ret = mi_lttng_writer_write_element_string(writer,
1619                                 mi_lttng_element_snapshot_ctrl_url, url);
1620                 if (ret) {
1621                         goto end;
1622                 }
1623         } else if (cmdline_ctrl_url) {
1624                 /* Destination of the output (ctrl_url)*/
1625                 ret = mi_lttng_writer_write_element_string(writer,
1626                                 mi_lttng_element_snapshot_ctrl_url, cmdline_ctrl_url);
1627                 if (ret) {
1628                         goto end;
1629                 }
1630
1631                 /* Destination of the output (data_url) */
1632                 ret = mi_lttng_writer_write_element_string(writer,
1633                                 mi_lttng_element_snapshot_data_url, cmdline_data_url);
1634                 if (ret) {
1635                         goto end;
1636                 }
1637         }
1638
1639         /* Close record_snapshot element */
1640         ret = mi_lttng_writer_close_element(writer);
1641
1642 end:
1643         return ret;
1644 }