formats/ctf-text/ctf-text.c

   1 /*
   2  * BabelTrace - Common Trace Format (CTF)
   3  *
   4  * CTF Text Format registration.
   5  *
   6  * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
   7  *
   8  * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to deal
  12  * in the Software without restriction, including without limitation the rights
  13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14  * copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  */
  20
  21 #include <babeltrace/format.h>
  22 #include <babeltrace/ctf-text/types.h>
  23 #include <babeltrace/ctf/metadata.h>
  24 #include <babeltrace/babeltrace-internal.h>
  25 #include <babeltrace/ctf/events-internal.h>
  26 #include <inttypes.h>
  27 #include <sys/mman.h>
  28 #include <errno.h>
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <fcntl.h>
  32 #include <dirent.h>
  33 #include <glib.h>
  34 #include <unistd.h>
  35 #include <stdlib.h>
  36
  37 #define NSEC_PER_SEC 1000000000ULL
  38
  39 int opt_all_field_names,
  40         opt_scope_field_names,
  41         opt_header_field_names,
  42         opt_context_field_names,
  43         opt_payload_field_names,
  44         opt_all_fields,
  45         opt_trace_field,
  46         opt_trace_domain_field,
  47         opt_trace_procname_field,
  48         opt_trace_vpid_field,
  49         opt_trace_hostname_field,
  50         opt_trace_default_fields = 1,
  51         opt_loglevel_field,
  52         opt_emf_field,
  53         opt_callsite_field,
  54         opt_delta_field = 1;
  55
  56 enum field_item {
  57         ITEM_SCOPE,
  58         ITEM_HEADER,
  59         ITEM_CONTEXT,
  60         ITEM_PAYLOAD,
  61 };
  62
  63 enum bt_loglevel {
  64         BT_LOGLEVEL_EMERG                  = 0,
  65         BT_LOGLEVEL_ALERT                  = 1,
  66         BT_LOGLEVEL_CRIT                   = 2,
  67         BT_LOGLEVEL_ERR                    = 3,
  68         BT_LOGLEVEL_WARNING                = 4,
  69         BT_LOGLEVEL_NOTICE                 = 5,
  70         BT_LOGLEVEL_INFO                   = 6,
  71         BT_LOGLEVEL_DEBUG_SYSTEM           = 7,
  72         BT_LOGLEVEL_DEBUG_PROGRAM          = 8,
  73         BT_LOGLEVEL_DEBUG_PROCESS          = 9,
  74         BT_LOGLEVEL_DEBUG_MODULE           = 10,
  75         BT_LOGLEVEL_DEBUG_UNIT             = 11,
  76         BT_LOGLEVEL_DEBUG_FUNCTION         = 12,
  77         BT_LOGLEVEL_DEBUG_LINE             = 13,
  78         BT_LOGLEVEL_DEBUG                  = 14,
  79 };
  80
  81 static
  82 struct trace_descriptor *ctf_text_open_trace(const char *path, int flags,
  83                 void (*packet_seek)(struct stream_pos *pos, size_t index,
  84                         int whence), FILE *metadata_fp);
  85 static
  86 int ctf_text_close_trace(struct trace_descriptor *descriptor);
  87
  88 static
  89 rw_dispatch write_dispatch_table[] = {
  90         [ CTF_TYPE_INTEGER ] = ctf_text_integer_write,
  91         [ CTF_TYPE_FLOAT ] = ctf_text_float_write,
  92         [ CTF_TYPE_ENUM ] = ctf_text_enum_write,
  93         [ CTF_TYPE_STRING ] = ctf_text_string_write,
  94         [ CTF_TYPE_STRUCT ] = ctf_text_struct_write,
  95         [ CTF_TYPE_VARIANT ] = ctf_text_variant_write,
  96         [ CTF_TYPE_ARRAY ] = ctf_text_array_write,
  97         [ CTF_TYPE_SEQUENCE ] = ctf_text_sequence_write,
  98 };
  99
 100 static
 101 struct format ctf_text_format = {
 102         .open_trace = ctf_text_open_trace,
 103         .close_trace = ctf_text_close_trace,
 104 };
 105
 106 static GQuark Q_STREAM_PACKET_CONTEXT_TIMESTAMP_BEGIN,
 107         Q_STREAM_PACKET_CONTEXT_TIMESTAMP_END,
 108         Q_STREAM_PACKET_CONTEXT_EVENTS_DISCARDED,
 109         Q_STREAM_PACKET_CONTEXT_CONTENT_SIZE,
 110         Q_STREAM_PACKET_CONTEXT_PACKET_SIZE;
 111
 112 static
 113 void __attribute__((constructor)) init_quarks(void)
 114 {
 115         Q_STREAM_PACKET_CONTEXT_TIMESTAMP_BEGIN = g_quark_from_static_string("stream.packet.context.timestamp_begin");
 116         Q_STREAM_PACKET_CONTEXT_TIMESTAMP_END = g_quark_from_static_string("stream.packet.context.timestamp_end");
 117         Q_STREAM_PACKET_CONTEXT_EVENTS_DISCARDED = g_quark_from_static_string("stream.packet.context.events_discarded");
 118         Q_STREAM_PACKET_CONTEXT_CONTENT_SIZE = g_quark_from_static_string("stream.packet.context.content_size");
 119         Q_STREAM_PACKET_CONTEXT_PACKET_SIZE = g_quark_from_static_string("stream.packet.context.packet_size");
 120 }
 121
 122 static
 123 struct ctf_callsite_dups *ctf_trace_callsite_lookup(struct ctf_trace *trace,
 124                         GQuark callsite_name)
 125 {
 126         return g_hash_table_lookup(trace->callsites,
 127                         (gpointer) (unsigned long) callsite_name);
 128 }
 129
 130 int print_field(struct definition *definition)
 131 {
 132         /* Print all fields in verbose mode */
 133         if (babeltrace_verbose)
 134                 return 1;
 135
 136         /* Filter out part of the packet context */
 137         if (definition->path == Q_STREAM_PACKET_CONTEXT_TIMESTAMP_BEGIN)
 138                 return 0;
 139         if (definition->path == Q_STREAM_PACKET_CONTEXT_TIMESTAMP_END)
 140                 return 0;
 141         if (definition->path == Q_STREAM_PACKET_CONTEXT_EVENTS_DISCARDED)
 142                 return 0;
 143         if (definition->path == Q_STREAM_PACKET_CONTEXT_CONTENT_SIZE)
 144                 return 0;
 145         if (definition->path == Q_STREAM_PACKET_CONTEXT_PACKET_SIZE)
 146                 return 0;
 147
 148         return 1;
 149 }
 150
 151 static
 152 void set_field_names_print(struct ctf_text_stream_pos *pos, enum field_item item)
 153 {
 154         switch (item) {
 155         case ITEM_SCOPE:
 156                 if (opt_all_field_names || opt_scope_field_names)
 157                         pos->print_names = 1;
 158                 else
 159                         pos->print_names = 0;
 160                 break;
 161         case ITEM_HEADER:
 162                 if (opt_all_field_names || opt_header_field_names)
 163                         pos->print_names = 1;
 164                 else
 165                         pos->print_names = 0;
 166                 break;
 167         case ITEM_CONTEXT:
 168                 if (opt_all_field_names || opt_context_field_names)
 169                         pos->print_names = 1;
 170                 else
 171                         pos->print_names = 0;
 172                 break;
 173         case ITEM_PAYLOAD:
 174                 if (opt_all_field_names || opt_payload_field_names)
 175                         pos->print_names = 1;
 176                 else
 177                         pos->print_names = 0;
 178
 179                 break;
 180         default:
 181                 assert(0);
 182         }
 183 }
 184
 185 static
 186 const char *print_loglevel(int value)
 187 {
 188         switch (value) {
 189         case -1:
 190                 return "";
 191         case BT_LOGLEVEL_EMERG:
 192                 return "TRACE_EMERG";
 193         case BT_LOGLEVEL_ALERT:
 194                 return "TRACE_ALERT";
 195         case BT_LOGLEVEL_CRIT:
 196                 return "TRACE_CRIT";
 197         case BT_LOGLEVEL_ERR:
 198                 return "TRACE_ERR";
 199         case BT_LOGLEVEL_WARNING:
 200                 return "TRACE_WARNING";
 201         case BT_LOGLEVEL_NOTICE:
 202                 return "TRACE_NOTICE";
 203         case BT_LOGLEVEL_INFO:
 204                 return "TRACE_INFO";
 205         case BT_LOGLEVEL_DEBUG_SYSTEM:
 206                 return "TRACE_DEBUG_SYSTEM";
 207         case BT_LOGLEVEL_DEBUG_PROGRAM:
 208                 return "TRACE_DEBUG_PROGRAM";
 209         case BT_LOGLEVEL_DEBUG_PROCESS:
 210                 return "TRACE_DEBUG_PROCESS";
 211         case BT_LOGLEVEL_DEBUG_MODULE:
 212                 return "TRACE_DEBUG_MODULE";
 213         case BT_LOGLEVEL_DEBUG_UNIT:
 214                 return "TRACE_DEBUG_UNIT";
 215         case BT_LOGLEVEL_DEBUG_FUNCTION:
 216                 return "TRACE_DEBUG_FUNCTION";
 217         case BT_LOGLEVEL_DEBUG_LINE:
 218                 return "TRACE_DEBUG_LINE";
 219         case BT_LOGLEVEL_DEBUG:
 220                 return "TRACE_DEBUG";
 221         default:
 222                 return "<<UNKNOWN>>";
 223         }
 224 }
 225
 226 static
 227 int ctf_text_write_event(struct stream_pos *ppos, struct ctf_stream_definition *stream)
 228
 229 {
 230         struct ctf_text_stream_pos *pos =
 231                 container_of(ppos, struct ctf_text_stream_pos, parent);
 232         struct ctf_stream_declaration *stream_class = stream->stream_class;
 233         int field_nr_saved;
 234         struct ctf_event_declaration *event_class;
 235         struct ctf_event_definition *event;
 236         uint64_t id;
 237         int ret;
 238         int dom_print = 0;
 239
 240         id = stream->event_id;
 241
 242         if (id >= stream_class->events_by_id->len) {
 243                 fprintf(stderr, "[error] Event id %" PRIu64 " is outside range.\n", id);
 244                 return -EINVAL;
 245         }
 246         event = g_ptr_array_index(stream->events_by_id, id);
 247         if (!event) {
 248                 fprintf(stderr, "[error] Event id %" PRIu64 " is unknown.\n", id);
 249                 return -EINVAL;
 250         }
 251         event_class = g_ptr_array_index(stream_class->events_by_id, id);
 252         if (!event_class) {
 253                 fprintf(stderr, "[error] Event class id %" PRIu64 " is unknown.\n", id);
 254                 return -EINVAL;
 255         }
 256
 257         /* Print events discarded */
 258         if (stream->events_discarded) {
 259                 fflush(pos->fp);
 260                 fprintf(stderr, "[warning] Tracer discarded %" PRIu64 " events between [",
 261                         stream->events_discarded);
 262                 if (opt_clock_cycles) {
 263                         ctf_print_timestamp(stderr, stream,
 264                                         stream->prev_cycles_timestamp);
 265                         fprintf(stderr, "] and [");
 266                         ctf_print_timestamp(stderr, stream,
 267                                         stream->prev_cycles_timestamp_end);
 268                 } else {
 269                         ctf_print_timestamp(stderr, stream,
 270                                         stream->prev_real_timestamp);
 271                         fprintf(stderr, "] and [");
 272                         ctf_print_timestamp(stderr, stream,
 273                                         stream->prev_real_timestamp_end);
 274                 }
 275                 fprintf(stderr, "]. You should consider recording a new trace with larger buffers or with fewer events enabled.\n");
 276                 fflush(stderr);
 277                 stream->events_discarded = 0;
 278         }
 279
 280         if (stream->has_timestamp) {
 281                 set_field_names_print(pos, ITEM_HEADER);
 282                 if (pos->print_names)
 283                         fprintf(pos->fp, "timestamp = ");
 284                 else
 285                         fprintf(pos->fp, "[");
 286                 if (opt_clock_cycles) {
 287                         ctf_print_timestamp(pos->fp, stream, stream->cycles_timestamp);
 288                 } else {
 289                         ctf_print_timestamp(pos->fp, stream, stream->real_timestamp);
 290                 }
 291                 if (!pos->print_names)
 292                         fprintf(pos->fp, "]");
 293
 294                 if (pos->print_names)
 295                         fprintf(pos->fp, ", ");
 296                 else
 297                         fprintf(pos->fp, " ");
 298         }
 299         if ((opt_delta_field || opt_all_fields) && stream->has_timestamp) {
 300                 uint64_t delta, delta_sec, delta_nsec;
 301
 302                 set_field_names_print(pos, ITEM_HEADER);
 303                 if (pos->print_names)
 304                         fprintf(pos->fp, "delta = ");
 305                 else
 306                         fprintf(pos->fp, "(");
 307                 if (pos->last_real_timestamp != -1ULL) {
 308                         delta = stream->real_timestamp - pos->last_real_timestamp;
 309                         delta_sec = delta / NSEC_PER_SEC;
 310                         delta_nsec = delta % NSEC_PER_SEC;
 311                         fprintf(pos->fp, "+%" PRIu64 ".%09" PRIu64,
 312                                 delta_sec, delta_nsec);
 313                 } else {
 314                         fprintf(pos->fp, "+?.?????????");
 315                 }
 316                 if (!pos->print_names)
 317                         fprintf(pos->fp, ")");
 318
 319                 if (pos->print_names)
 320                         fprintf(pos->fp, ", ");
 321                 else
 322                         fprintf(pos->fp, " ");
 323                 pos->last_real_timestamp = stream->real_timestamp;
 324                 pos->last_cycles_timestamp = stream->cycles_timestamp;
 325         }
 326
 327         if ((opt_trace_field || opt_all_fields) && stream_class->trace->path[0] != '\0') {
 328                 set_field_names_print(pos, ITEM_HEADER);
 329                 if (pos->print_names) {
 330                         fprintf(pos->fp, "trace = ");
 331                 }
 332                 fprintf(pos->fp, "%s", stream_class->trace->path);
 333                 if (pos->print_names)
 334                         fprintf(pos->fp, ", ");
 335                 else
 336                         fprintf(pos->fp, " ");
 337         }
 338         if ((opt_trace_hostname_field || opt_all_fields || opt_trace_default_fields)
 339                         && stream_class->trace->env.hostname[0] != '\0') {
 340                 set_field_names_print(pos, ITEM_HEADER);
 341                 if (pos->print_names) {
 342                         fprintf(pos->fp, "trace:hostname = ");
 343                 }
 344                 fprintf(pos->fp, "%s", stream_class->trace->env.hostname);
 345                 if (pos->print_names)
 346                         fprintf(pos->fp, ", ");
 347                 dom_print = 1;
 348         }
 349         if ((opt_trace_domain_field || opt_all_fields) && stream_class->trace->env.domain[0] != '\0') {
 350                 set_field_names_print(pos, ITEM_HEADER);
 351                 if (pos->print_names) {
 352                         fprintf(pos->fp, "trace:domain = ");
 353                 }
 354                 fprintf(pos->fp, "%s", stream_class->trace->env.domain);
 355                 if (pos->print_names)
 356                         fprintf(pos->fp, ", ");
 357                 dom_print = 1;
 358         }
 359         if ((opt_trace_procname_field || opt_all_fields || opt_trace_default_fields)
 360                         && stream_class->trace->env.procname[0] != '\0') {
 361                 set_field_names_print(pos, ITEM_HEADER);
 362                 if (pos->print_names) {
 363                         fprintf(pos->fp, "trace:procname = ");
 364                 } else if (dom_print) {
 365                         fprintf(pos->fp, ":");
 366                 }
 367                 fprintf(pos->fp, "%s", stream_class->trace->env.procname);
 368                 if (pos->print_names)
 369                         fprintf(pos->fp, ", ");
 370                 dom_print = 1;
 371         }
 372         if ((opt_trace_vpid_field || opt_all_fields || opt_trace_default_fields)
 373                         && stream_class->trace->env.vpid != -1) {
 374                 set_field_names_print(pos, ITEM_HEADER);
 375                 if (pos->print_names) {
 376                         fprintf(pos->fp, "trace:vpid = ");
 377                 } else if (dom_print) {
 378                         fprintf(pos->fp, ":");
 379                 }
 380                 fprintf(pos->fp, "%d", stream_class->trace->env.vpid);
 381                 if (pos->print_names)
 382                         fprintf(pos->fp, ", ");
 383                 dom_print = 1;
 384         }
 385         if ((opt_loglevel_field || opt_all_fields) && event_class->loglevel != -1) {
 386                 set_field_names_print(pos, ITEM_HEADER);
 387                 if (pos->print_names) {
 388                         fprintf(pos->fp, "loglevel = ");
 389                 } else if (dom_print) {
 390                         fprintf(pos->fp, ":");
 391                 }
 392                 fprintf(pos->fp, "%s (%d)",
 393                         print_loglevel(event_class->loglevel),
 394                         event_class->loglevel);
 395                 if (pos->print_names)
 396                         fprintf(pos->fp, ", ");
 397                 dom_print = 1;
 398         }
 399         if ((opt_emf_field || opt_all_fields) && event_class->model_emf_uri) {
 400                 set_field_names_print(pos, ITEM_HEADER);
 401                 if (pos->print_names) {
 402                         fprintf(pos->fp, "model.emf.uri = ");
 403                 } else if (dom_print) {
 404                         fprintf(pos->fp, ":");
 405                 }
 406                 fprintf(pos->fp, "\"%s\"",
 407                         g_quark_to_string(event_class->model_emf_uri));
 408                 if (pos->print_names)
 409                         fprintf(pos->fp, ", ");
 410                 dom_print = 1;
 411         }
 412         if ((opt_callsite_field || opt_all_fields)) {
 413                 struct ctf_callsite_dups *cs_dups;
 414                 struct ctf_callsite *callsite;
 415
 416                 cs_dups = ctf_trace_callsite_lookup(stream_class->trace,
 417                                 event_class->name);
 418                 if (cs_dups) {
 419                         int i = 0;
 420
 421                         set_field_names_print(pos, ITEM_HEADER);
 422                         if (pos->print_names) {
 423                                 fprintf(pos->fp, "callsite = ");
 424                         } else if (dom_print) {
 425                                 fprintf(pos->fp, ":");
 426                         }
 427                         fprintf(pos->fp, "[");
 428                         bt_list_for_each_entry(callsite, &cs_dups->head, node) {
 429                                 if (i != 0)
 430                                         fprintf(pos->fp, ",");
 431                                 if (CTF_CALLSITE_FIELD_IS_SET(callsite, ip)) {
 432                                         fprintf(pos->fp, "%s@0x%" PRIx64 ":%s:%" PRIu64 "",
 433                                                 callsite->func, callsite->ip, callsite->file,
 434                                                 callsite->line);
 435                                 } else {
 436                                         fprintf(pos->fp, "%s:%s:%" PRIu64 "",
 437                                                 callsite->func, callsite->file,
 438                                                 callsite->line);
 439                                 }
 440                                 i++;
 441                         }
 442                         fprintf(pos->fp, "]");
 443                         if (pos->print_names)
 444                                 fprintf(pos->fp, ", ");
 445                         dom_print = 1;
 446                 }
 447         }
 448         if (dom_print && !pos->print_names)
 449                 fprintf(pos->fp, " ");
 450         set_field_names_print(pos, ITEM_HEADER);
 451         if (pos->print_names)
 452                 fprintf(pos->fp, "name = ");
 453         fprintf(pos->fp, "%s", g_quark_to_string(event_class->name));
 454         if (pos->print_names)
 455                 pos->field_nr++;
 456         else
 457                 fprintf(pos->fp, ":");
 458
 459         /* print cpuid field from packet context */
 460         if (stream->stream_packet_context) {
 461                 if (pos->field_nr++ != 0)
 462                         fprintf(pos->fp, ",");
 463                 set_field_names_print(pos, ITEM_SCOPE);
 464                 if (pos->print_names)
 465                         fprintf(pos->fp, " stream.packet.context =");
 466                 field_nr_saved = pos->field_nr;
 467                 pos->field_nr = 0;
 468                 set_field_names_print(pos, ITEM_CONTEXT);
 469                 ret = generic_rw(ppos, &stream->stream_packet_context->p);
 470                 if (ret)
 471                         goto error;
 472                 pos->field_nr = field_nr_saved;
 473         }
 474
 475         /* Only show the event header in verbose mode */
 476         if (babeltrace_verbose && stream->stream_event_header) {
 477                 if (pos->field_nr++ != 0)
 478                         fprintf(pos->fp, ",");
 479                 set_field_names_print(pos, ITEM_SCOPE);
 480                 if (pos->print_names)
 481                         fprintf(pos->fp, " stream.event.header =");
 482                 field_nr_saved = pos->field_nr;
 483                 pos->field_nr = 0;
 484                 set_field_names_print(pos, ITEM_CONTEXT);
 485                 ret = generic_rw(ppos, &stream->stream_event_header->p);
 486                 if (ret)
 487                         goto error;
 488                 pos->field_nr = field_nr_saved;
 489         }
 490
 491         /* print stream-declared event context */
 492         if (stream->stream_event_context) {
 493                 if (pos->field_nr++ != 0)
 494                         fprintf(pos->fp, ",");
 495                 set_field_names_print(pos, ITEM_SCOPE);
 496                 if (pos->print_names)
 497                         fprintf(pos->fp, " stream.event.context =");
 498                 field_nr_saved = pos->field_nr;
 499                 pos->field_nr = 0;
 500                 set_field_names_print(pos, ITEM_CONTEXT);
 501                 ret = generic_rw(ppos, &stream->stream_event_context->p);
 502                 if (ret)
 503                         goto error;
 504                 pos->field_nr = field_nr_saved;
 505         }
 506
 507         /* print event-declared event context */
 508         if (event->event_context) {
 509                 if (pos->field_nr++ != 0)
 510                         fprintf(pos->fp, ",");
 511                 set_field_names_print(pos, ITEM_SCOPE);
 512                 if (pos->print_names)
 513                         fprintf(pos->fp, " event.context =");
 514                 field_nr_saved = pos->field_nr;
 515                 pos->field_nr = 0;
 516                 set_field_names_print(pos, ITEM_CONTEXT);
 517                 ret = generic_rw(ppos, &event->event_context->p);
 518                 if (ret)
 519                         goto error;
 520                 pos->field_nr = field_nr_saved;
 521         }
 522
 523         /* Read and print event payload */
 524         if (event->event_fields) {
 525                 if (pos->field_nr++ != 0)
 526                         fprintf(pos->fp, ",");
 527                 set_field_names_print(pos, ITEM_SCOPE);
 528                 if (pos->print_names)
 529                         fprintf(pos->fp, " event.fields =");
 530                 field_nr_saved = pos->field_nr;
 531                 pos->field_nr = 0;
 532                 set_field_names_print(pos, ITEM_PAYLOAD);
 533                 ret = generic_rw(ppos, &event->event_fields->p);
 534                 if (ret)
 535                         goto error;
 536                 pos->field_nr = field_nr_saved;
 537         }
 538         /* newline */
 539         fprintf(pos->fp, "\n");
 540         pos->field_nr = 0;
 541
 542         return 0;
 543
 544 error:
 545         fprintf(stderr, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
 546         return ret;
 547 }
 548
 549 static
 550 struct trace_descriptor *ctf_text_open_trace(const char *path, int flags,
 551                 void (*packet_seek)(struct stream_pos *pos, size_t index,
 552                         int whence), FILE *metadata_fp)
 553 {
 554         struct ctf_text_stream_pos *pos;
 555         FILE *fp;
 556
 557         pos = g_new0(struct ctf_text_stream_pos, 1);
 558
 559         pos->last_real_timestamp = -1ULL;
 560         pos->last_cycles_timestamp = -1ULL;
 561         switch (flags & O_ACCMODE) {
 562         case O_RDWR:
 563                 if (!path)
 564                         fp = stdout;
 565                 else
 566                         fp = fopen(path, "w");
 567                 if (!fp)
 568                         goto error;
 569                 pos->fp = fp;
 570                 pos->parent.rw_table = write_dispatch_table;
 571                 pos->parent.event_cb = ctf_text_write_event;
 572                 pos->print_names = 0;
 573                 break;
 574         case O_RDONLY:
 575         default:
 576                 fprintf(stderr, "[error] Incorrect open flags.\n");
 577                 goto error;
 578         }
 579
 580         return &pos->trace_descriptor;
 581 error:
 582         g_free(pos);
 583         return NULL;
 584 }
 585
 586 static
 587 int ctf_text_close_trace(struct trace_descriptor *td)
 588 {
 589         int ret;
 590         struct ctf_text_stream_pos *pos =
 591                 container_of(td, struct ctf_text_stream_pos, trace_descriptor);
 592         ret = fclose(pos->fp);
 593         if (ret) {
 594                 perror("Error on fclose");
 595                 return -1;
 596         }
 597         g_free(pos);
 598         return 0;
 599 }
 600
 601 static
 602 void __attribute__((constructor)) ctf_text_init(void)
 603 {
 604         int ret;
 605
 606         ctf_text_format.name = g_quark_from_static_string("text");
 607         ret = bt_register_format(&ctf_text_format);
 608         assert(!ret);
 609 }
 610
 611 static
 612 void __attribute__((destructor)) ctf_text_exit(void)
 613 {
 614         bt_unregister_format(&ctf_text_format);
 615 }