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