formats/ctf/ctf.c

   1 /*
   2  * BabelTrace - Common Trace Format (CTF)
   3  *
   4  * 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/types.h>
  23 #include <babeltrace/ctf/metadata.h>
  24 #include <babeltrace/babeltrace-internal.h>
  25 #include <babeltrace/ctf/events-internal.h>
  26 #include <babeltrace/trace-handle-internal.h>
  27 #include <babeltrace/context-internal.h>
  28 #include <babeltrace/uuid.h>
  29 #include <babeltrace/endian.h>
  30 #include <inttypes.h>
  31 #include <stdio.h>
  32 #include <sys/mman.h>
  33 #include <errno.h>
  34 #include <sys/types.h>
  35 #include <sys/stat.h>
  36 #include <fcntl.h>
  37 #include <dirent.h>
  38 #include <glib.h>
  39 #include <unistd.h>
  40 #include <stdlib.h>
  41
  42 #include "metadata/ctf-scanner.h"
  43 #include "metadata/ctf-parser.h"
  44 #include "metadata/ctf-ast.h"
  45 #include "events-private.h"
  46 #include "memstream.h"
  47
  48 /*
  49  * We currently simply map a page to read the packet header and packet
  50  * context to get the packet length and content length. (in bits)
  51  */
  52 #define MAX_PACKET_HEADER_LEN   (getpagesize() * CHAR_BIT)
  53 #define WRITE_PACKET_LEN        (getpagesize() * 8 * CHAR_BIT)
  54
  55 #ifndef min
  56 #define min(a, b)       (((a) < (b)) ? (a) : (b))
  57 #endif
  58
  59 #define NSEC_PER_SEC 1000000000ULL
  60
  61 int opt_clock_cycles,
  62         opt_clock_seconds,
  63         opt_clock_date,
  64         opt_clock_gmt;
  65
  66 uint64_t opt_clock_offset;
  67
  68 extern int yydebug;
  69
  70 static
  71 struct trace_descriptor *ctf_open_trace(const char *path, int flags,
  72                 void (*packet_seek)(struct stream_pos *pos, size_t index,
  73                         int whence),
  74                 FILE *metadata_fp);
  75 static
  76 struct trace_descriptor *ctf_open_mmap_trace(
  77                 struct mmap_stream_list *mmap_list,
  78                 void (*packet_seek)(struct stream_pos *pos, size_t index,
  79                         int whence),
  80                 FILE *metadata_fp);
  81 static
  82 void ctf_set_context(struct trace_descriptor *descriptor,
  83                 struct bt_context *ctx);
  84 static
  85 void ctf_set_handle(struct trace_descriptor *descriptor,
  86                 struct bt_trace_handle *handle);
  87
  88 static
  89 void ctf_close_trace(struct trace_descriptor *descriptor);
  90 static
  91 uint64_t ctf_timestamp_begin(struct trace_descriptor *descriptor,
  92                 struct bt_trace_handle *handle, enum bt_clock_type type);
  93 static
  94 uint64_t ctf_timestamp_end(struct trace_descriptor *descriptor,
  95                 struct bt_trace_handle *handle, enum bt_clock_type type);
  96 static
  97 int ctf_convert_index_timestamp(struct trace_descriptor *tdp);
  98
  99 static
 100 rw_dispatch read_dispatch_table[] = {
 101         [ CTF_TYPE_INTEGER ] = ctf_integer_read,
 102         [ CTF_TYPE_FLOAT ] = ctf_float_read,
 103         [ CTF_TYPE_ENUM ] = ctf_enum_read,
 104         [ CTF_TYPE_STRING ] = ctf_string_read,
 105         [ CTF_TYPE_STRUCT ] = ctf_struct_rw,
 106         [ CTF_TYPE_VARIANT ] = ctf_variant_rw,
 107         [ CTF_TYPE_ARRAY ] = ctf_array_read,
 108         [ CTF_TYPE_SEQUENCE ] = ctf_sequence_read,
 109 };
 110
 111 static
 112 rw_dispatch write_dispatch_table[] = {
 113         [ CTF_TYPE_INTEGER ] = ctf_integer_write,
 114         [ CTF_TYPE_FLOAT ] = ctf_float_write,
 115         [ CTF_TYPE_ENUM ] = ctf_enum_write,
 116         [ CTF_TYPE_STRING ] = ctf_string_write,
 117         [ CTF_TYPE_STRUCT ] = ctf_struct_rw,
 118         [ CTF_TYPE_VARIANT ] = ctf_variant_rw,
 119         [ CTF_TYPE_ARRAY ] = ctf_array_write,
 120         [ CTF_TYPE_SEQUENCE ] = ctf_sequence_write,
 121 };
 122
 123 static
 124 struct format ctf_format = {
 125         .open_trace = ctf_open_trace,
 126         .open_mmap_trace = ctf_open_mmap_trace,
 127         .close_trace = ctf_close_trace,
 128         .set_context = ctf_set_context,
 129         .set_handle = ctf_set_handle,
 130         .timestamp_begin = ctf_timestamp_begin,
 131         .timestamp_end = ctf_timestamp_end,
 132         .convert_index_timestamp = ctf_convert_index_timestamp,
 133 };
 134
 135 static
 136 uint64_t ctf_timestamp_begin(struct trace_descriptor *descriptor,
 137                 struct bt_trace_handle *handle, enum bt_clock_type type)
 138 {
 139         struct ctf_trace *tin;
 140         uint64_t begin = ULLONG_MAX;
 141         int i, j;
 142
 143         tin = container_of(descriptor, struct ctf_trace, parent);
 144
 145         if (!tin)
 146                 goto error;
 147
 148         /* for each stream_class */
 149         for (i = 0; i < tin->streams->len; i++) {
 150                 struct ctf_stream_declaration *stream_class;
 151
 152                 stream_class = g_ptr_array_index(tin->streams, i);
 153                 if (!stream_class)
 154                         continue;
 155                 /* for each file_stream */
 156                 for (j = 0; j < stream_class->streams->len; j++) {
 157                         struct ctf_stream_definition *stream;
 158                         struct ctf_file_stream *cfs;
 159                         struct ctf_stream_pos *stream_pos;
 160                         struct packet_index *index;
 161
 162                         stream = g_ptr_array_index(stream_class->streams, j);
 163                         cfs = container_of(stream, struct ctf_file_stream,
 164                                         parent);
 165                         stream_pos = &cfs->pos;
 166
 167                         if (!stream_pos->packet_real_index)
 168                                 goto error;
 169
 170                         if (type == BT_CLOCK_REAL) {
 171                                 index = &g_array_index(stream_pos->packet_real_index,
 172                                                 struct packet_index,
 173                                                 stream_pos->packet_real_index->len - 1);
 174                         } else if (type == BT_CLOCK_CYCLES) {
 175                                 index = &g_array_index(stream_pos->packet_cycles_index,
 176                                                 struct packet_index,
 177                                                 stream_pos->packet_real_index->len - 1);
 178
 179                         } else {
 180                                 goto error;
 181                         }
 182                         if (index->timestamp_begin < begin)
 183                                 begin = index->timestamp_begin;
 184                 }
 185         }
 186
 187         return begin;
 188
 189 error:
 190         return -1ULL;
 191 }
 192
 193 static
 194 uint64_t ctf_timestamp_end(struct trace_descriptor *descriptor,
 195                 struct bt_trace_handle *handle, enum bt_clock_type type)
 196 {
 197         struct ctf_trace *tin;
 198         uint64_t end = 0;
 199         int i, j;
 200
 201         tin = container_of(descriptor, struct ctf_trace, parent);
 202
 203         if (!tin)
 204                 goto error;
 205
 206         /* for each stream_class */
 207         for (i = 0; i < tin->streams->len; i++) {
 208                 struct ctf_stream_declaration *stream_class;
 209
 210                 stream_class = g_ptr_array_index(tin->streams, i);
 211                 if (!stream_class)
 212                         continue;
 213                 /* for each file_stream */
 214                 for (j = 0; j < stream_class->streams->len; j++) {
 215                         struct ctf_stream_definition *stream;
 216                         struct ctf_file_stream *cfs;
 217                         struct ctf_stream_pos *stream_pos;
 218                         struct packet_index *index;
 219
 220                         stream = g_ptr_array_index(stream_class->streams, j);
 221                         cfs = container_of(stream, struct ctf_file_stream,
 222                                         parent);
 223                         stream_pos = &cfs->pos;
 224
 225                         if (!stream_pos->packet_real_index)
 226                                 goto error;
 227
 228                         if (type == BT_CLOCK_REAL) {
 229                                 index = &g_array_index(stream_pos->packet_real_index,
 230                                                 struct packet_index,
 231                                                 stream_pos->packet_real_index->len - 1);
 232                         } else if (type == BT_CLOCK_CYCLES) {
 233                                 index = &g_array_index(stream_pos->packet_cycles_index,
 234                                                 struct packet_index,
 235                                                 stream_pos->packet_real_index->len - 1);
 236
 237                         } else {
 238                                 goto error;
 239                         }
 240                         if (index->timestamp_end > end)
 241                                 end = index->timestamp_end;
 242                 }
 243         }
 244
 245         return end;
 246
 247 error:
 248         return -1ULL;
 249 }
 250
 251 /*
 252  * Update stream current timestamp
 253  */
 254 static
 255 void ctf_update_timestamp(struct ctf_stream_definition *stream,
 256                           struct definition_integer *integer_definition)
 257 {
 258         struct declaration_integer *integer_declaration =
 259                 integer_definition->declaration;
 260         uint64_t oldval, newval, updateval;
 261
 262         if (unlikely(integer_declaration->len == 64)) {
 263                 stream->prev_cycles_timestamp = stream->cycles_timestamp;
 264                 stream->cycles_timestamp = integer_definition->value._unsigned;
 265                 stream->prev_real_timestamp = ctf_get_real_timestamp(stream,
 266                                 stream->prev_cycles_timestamp);
 267                 stream->real_timestamp = ctf_get_real_timestamp(stream,
 268                                 stream->cycles_timestamp);
 269                 return;
 270         }
 271         /* keep low bits */
 272         oldval = stream->cycles_timestamp;
 273         oldval &= (1ULL << integer_declaration->len) - 1;
 274         newval = integer_definition->value._unsigned;
 275         /* Test for overflow by comparing low bits */
 276         if (newval < oldval)
 277                 newval += 1ULL << integer_declaration->len;
 278         /* updateval contains old high bits, and new low bits (sum) */
 279         updateval = stream->cycles_timestamp;
 280         updateval &= ~((1ULL << integer_declaration->len) - 1);
 281         updateval += newval;
 282         stream->prev_cycles_timestamp = stream->cycles_timestamp;
 283         stream->cycles_timestamp = updateval;
 284
 285         /* convert to real timestamp */
 286         stream->prev_real_timestamp = ctf_get_real_timestamp(stream,
 287                         stream->prev_cycles_timestamp);
 288         stream->real_timestamp = ctf_get_real_timestamp(stream,
 289                         stream->cycles_timestamp);
 290 }
 291
 292 /*
 293  * Print timestamp, rescaling clock frequency to nanoseconds and
 294  * applying offsets as needed (unix time).
 295  */
 296 void ctf_print_timestamp_real(FILE *fp,
 297                         struct ctf_stream_definition *stream,
 298                         uint64_t timestamp)
 299 {
 300         uint64_t ts_sec = 0, ts_nsec;
 301
 302         ts_nsec = timestamp;
 303
 304         /* Add command-line offset */
 305         ts_sec += opt_clock_offset;
 306
 307         ts_sec += ts_nsec / NSEC_PER_SEC;
 308         ts_nsec = ts_nsec % NSEC_PER_SEC;
 309
 310         if (!opt_clock_seconds) {
 311                 struct tm tm;
 312                 time_t time_s = (time_t) ts_sec;
 313
 314                 if (!opt_clock_gmt) {
 315                         struct tm *res;
 316
 317                         res = localtime_r(&time_s, &tm);
 318                         if (!res) {
 319                                 fprintf(stderr, "[warning] Unable to get localtime.\n");
 320                                 goto seconds;
 321                         }
 322                 } else {
 323                         struct tm *res;
 324
 325                         res = gmtime_r(&time_s, &tm);
 326                         if (!res) {
 327                                 fprintf(stderr, "[warning] Unable to get gmtime.\n");
 328                                 goto seconds;
 329                         }
 330                 }
 331                 if (opt_clock_date) {
 332                         char timestr[26];
 333                         size_t res;
 334
 335                         /* Print date and time */
 336                         res = strftime(timestr, sizeof(timestr),
 337                                 "%F ", &tm);
 338                         if (!res) {
 339                                 fprintf(stderr, "[warning] Unable to print ascii time.\n");
 340                                 goto seconds;
 341                         }
 342                         fprintf(fp, "%s", timestr);
 343                 }
 344                 /* Print time in HH:MM:SS.ns */
 345                 fprintf(fp, "%02d:%02d:%02d.%09" PRIu64,
 346                         tm.tm_hour, tm.tm_min, tm.tm_sec, ts_nsec);
 347                 goto end;
 348         }
 349 seconds:
 350         fprintf(fp, "%3" PRIu64 ".%09" PRIu64,
 351                 ts_sec, ts_nsec);
 352
 353 end:
 354         return;
 355 }
 356
 357 /*
 358  * Print timestamp, in cycles
 359  */
 360 void ctf_print_timestamp_cycles(FILE *fp,
 361                 struct ctf_stream_definition *stream,
 362                 uint64_t timestamp)
 363 {
 364         fprintf(fp, "%020" PRIu64, timestamp);
 365 }
 366
 367 void ctf_print_timestamp(FILE *fp,
 368                 struct ctf_stream_definition *stream,
 369                 uint64_t timestamp)
 370 {
 371         if (opt_clock_cycles) {
 372                 ctf_print_timestamp_cycles(fp, stream, timestamp);
 373         } else {
 374                 ctf_print_timestamp_real(fp, stream, timestamp);
 375         }
 376 }
 377
 378 static
 379 int ctf_read_event(struct stream_pos *ppos, struct ctf_stream_definition *stream)
 380 {
 381         struct ctf_stream_pos *pos =
 382                 container_of(ppos, struct ctf_stream_pos, parent);
 383         struct ctf_stream_declaration *stream_class = stream->stream_class;
 384         struct ctf_event_definition *event;
 385         uint64_t id = 0;
 386         int ret;
 387
 388         /* We need to check for EOF here for empty files. */
 389         if (unlikely(pos->offset == EOF))
 390                 return EOF;
 391
 392         ctf_pos_get_event(pos);
 393
 394         /* save the current position as a restore point */
 395         pos->last_offset = pos->offset;
 396
 397         /*
 398          * This is the EOF check after we've advanced the position in
 399          * ctf_pos_get_event.
 400          */
 401         if (unlikely(pos->offset == EOF))
 402                 return EOF;
 403         assert(pos->offset < pos->content_size);
 404
 405         /* Read event header */
 406         if (likely(stream->stream_event_header)) {
 407                 struct definition_integer *integer_definition;
 408                 struct definition *variant;
 409
 410                 ret = generic_rw(ppos, &stream->stream_event_header->p);
 411                 if (unlikely(ret))
 412                         goto error;
 413                 /* lookup event id */
 414                 integer_definition = lookup_integer(&stream->stream_event_header->p, "id", FALSE);
 415                 if (integer_definition) {
 416                         id = integer_definition->value._unsigned;
 417                 } else {
 418                         struct definition_enum *enum_definition;
 419
 420                         enum_definition = lookup_enum(&stream->stream_event_header->p, "id", FALSE);
 421                         if (enum_definition) {
 422                                 id = enum_definition->integer->value._unsigned;
 423                         }
 424                 }
 425
 426                 variant = lookup_variant(&stream->stream_event_header->p, "v");
 427                 if (variant) {
 428                         integer_definition = lookup_integer(variant, "id", FALSE);
 429                         if (integer_definition) {
 430                                 id = integer_definition->value._unsigned;
 431                         }
 432                 }
 433                 stream->event_id = id;
 434
 435                 /* lookup timestamp */
 436                 stream->has_timestamp = 0;
 437                 integer_definition = lookup_integer(&stream->stream_event_header->p, "timestamp", FALSE);
 438                 if (integer_definition) {
 439                         ctf_update_timestamp(stream, integer_definition);
 440                         stream->has_timestamp = 1;
 441                 } else {
 442                         if (variant) {
 443                                 integer_definition = lookup_integer(variant, "timestamp", FALSE);
 444                                 if (integer_definition) {
 445                                         ctf_update_timestamp(stream, integer_definition);
 446                                         stream->has_timestamp = 1;
 447                                 }
 448                         }
 449                 }
 450         }
 451
 452         /* Read stream-declared event context */
 453         if (stream->stream_event_context) {
 454                 ret = generic_rw(ppos, &stream->stream_event_context->p);
 455                 if (ret)
 456                         goto error;
 457         }
 458
 459         if (unlikely(id >= stream_class->events_by_id->len)) {
 460                 fprintf(stderr, "[error] Event id %" PRIu64 " is outside range.\n", id);
 461                 return -EINVAL;
 462         }
 463         event = g_ptr_array_index(stream->events_by_id, id);
 464         if (unlikely(!event)) {
 465                 fprintf(stderr, "[error] Event id %" PRIu64 " is unknown.\n", id);
 466                 return -EINVAL;
 467         }
 468
 469         /* Read event-declared event context */
 470         if (event->event_context) {
 471                 ret = generic_rw(ppos, &event->event_context->p);
 472                 if (ret)
 473                         goto error;
 474         }
 475
 476         /* Read event payload */
 477         if (likely(event->event_fields)) {
 478                 ret = generic_rw(ppos, &event->event_fields->p);
 479                 if (ret)
 480                         goto error;
 481         }
 482
 483         return 0;
 484
 485 error:
 486         fprintf(stderr, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
 487         return ret;
 488 }
 489
 490 static
 491 int ctf_write_event(struct stream_pos *pos, struct ctf_stream_definition *stream)
 492 {
 493         struct ctf_stream_declaration *stream_class = stream->stream_class;
 494         struct ctf_event_definition *event;
 495         uint64_t id;
 496         int ret;
 497
 498         id = stream->event_id;
 499
 500         /* print event header */
 501         if (likely(stream->stream_event_header)) {
 502                 ret = generic_rw(pos, &stream->stream_event_header->p);
 503                 if (ret)
 504                         goto error;
 505         }
 506
 507         /* print stream-declared event context */
 508         if (stream->stream_event_context) {
 509                 ret = generic_rw(pos, &stream->stream_event_context->p);
 510                 if (ret)
 511                         goto error;
 512         }
 513
 514         if (unlikely(id >= stream_class->events_by_id->len)) {
 515                 fprintf(stderr, "[error] Event id %" PRIu64 " is outside range.\n", id);
 516                 return -EINVAL;
 517         }
 518         event = g_ptr_array_index(stream->events_by_id, id);
 519         if (unlikely(!event)) {
 520                 fprintf(stderr, "[error] Event id %" PRIu64 " is unknown.\n", id);
 521                 return -EINVAL;
 522         }
 523
 524         /* print event-declared event context */
 525         if (event->event_context) {
 526                 ret = generic_rw(pos, &event->event_context->p);
 527                 if (ret)
 528                         goto error;
 529         }
 530
 531         /* Read and print event payload */
 532         if (likely(event->event_fields)) {
 533                 ret = generic_rw(pos, &event->event_fields->p);
 534                 if (ret)
 535                         goto error;
 536         }
 537
 538         return 0;
 539
 540 error:
 541         fprintf(stderr, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
 542         return ret;
 543 }
 544
 545 void ctf_init_pos(struct ctf_stream_pos *pos, int fd, int open_flags)
 546 {
 547         pos->fd = fd;
 548         pos->mmap_offset = 0;
 549         pos->packet_size = 0;
 550         pos->content_size = 0;
 551         pos->content_size_loc = NULL;
 552         pos->base_mma = NULL;
 553         pos->offset = 0;
 554         pos->dummy = false;
 555         pos->cur_index = 0;
 556         pos->packet_real_index = NULL;
 557         if (fd >= 0)
 558                 pos->packet_cycles_index = g_array_new(FALSE, TRUE,
 559                                                 sizeof(struct packet_index));
 560         else
 561                 pos->packet_cycles_index = NULL;
 562         switch (open_flags & O_ACCMODE) {
 563         case O_RDONLY:
 564                 pos->prot = PROT_READ;
 565                 pos->flags = MAP_PRIVATE;
 566                 pos->parent.rw_table = read_dispatch_table;
 567                 pos->parent.event_cb = ctf_read_event;
 568                 break;
 569         case O_RDWR:
 570                 pos->prot = PROT_WRITE; /* Write has priority */
 571                 pos->flags = MAP_SHARED;
 572                 pos->parent.rw_table = write_dispatch_table;
 573                 pos->parent.event_cb = ctf_write_event;
 574                 if (fd >= 0)
 575                         ctf_packet_seek(&pos->parent, 0, SEEK_SET);     /* position for write */
 576                 break;
 577         default:
 578                 assert(0);
 579         }
 580 }
 581
 582 void ctf_fini_pos(struct ctf_stream_pos *pos)
 583 {
 584         int ret;
 585
 586         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 587                 *pos->content_size_loc = pos->offset;
 588         if (pos->base_mma) {
 589                 /* unmap old base */
 590                 ret = munmap_align(pos->base_mma);
 591                 if (ret) {
 592                         fprintf(stderr, "[error] Unable to unmap old base: %s.\n",
 593                                 strerror(errno));
 594                         assert(0);
 595                 }
 596         }
 597         (void) g_array_free(pos->packet_cycles_index, TRUE);
 598         (void) g_array_free(pos->packet_real_index, TRUE);
 599 }
 600
 601 /*
 602  * for SEEK_CUR: go to next packet.
 603  * for SEEK_POS: go to packet numer (index).
 604  */
 605 void ctf_packet_seek(struct stream_pos *stream_pos, size_t index, int whence)
 606 {
 607         struct ctf_stream_pos *pos =
 608                 container_of(stream_pos, struct ctf_stream_pos, parent);
 609         struct ctf_file_stream *file_stream =
 610                 container_of(pos, struct ctf_file_stream, pos);
 611         int ret;
 612         off_t off;
 613         struct packet_index *packet_index;
 614
 615         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 616                 *pos->content_size_loc = pos->offset;
 617
 618         if (pos->base_mma) {
 619                 /* unmap old base */
 620                 ret = munmap_align(pos->base_mma);
 621                 if (ret) {
 622                         fprintf(stderr, "[error] Unable to unmap old base: %s.\n",
 623                                 strerror(errno));
 624                         assert(0);
 625                 }
 626                 pos->base_mma = NULL;
 627         }
 628
 629         /*
 630          * The caller should never ask for ctf_move_pos across packets,
 631          * except to get exactly at the beginning of the next packet.
 632          */
 633         if (pos->prot == PROT_WRITE) {
 634                 switch (whence) {
 635                 case SEEK_CUR:
 636                         /* The writer will add padding */
 637                         pos->mmap_offset += WRITE_PACKET_LEN / CHAR_BIT;
 638                         break;
 639                 case SEEK_SET:
 640                         assert(index == 0);     /* only seek supported for now */
 641                         pos->cur_index = 0;
 642                         break;
 643                 default:
 644                         assert(0);
 645                 }
 646                 pos->content_size = -1U;        /* Unknown at this point */
 647                 pos->packet_size = WRITE_PACKET_LEN;
 648                 off = posix_fallocate(pos->fd, pos->mmap_offset,
 649                                       pos->packet_size / CHAR_BIT);
 650                 assert(off >= 0);
 651                 pos->offset = 0;
 652         } else {
 653         read_next_packet:
 654                 switch (whence) {
 655                 case SEEK_CUR:
 656                 {
 657                         uint64_t events_discarded_diff;
 658
 659                         if (pos->offset == EOF) {
 660                                 return;
 661                         }
 662                         /* For printing discarded event count */
 663                         packet_index = &g_array_index(pos->packet_cycles_index,
 664                                         struct packet_index, pos->cur_index);
 665                         file_stream->parent.prev_cycles_timestamp_end =
 666                                 packet_index->timestamp_end;
 667                         file_stream->parent.prev_cycles_timestamp =
 668                                 packet_index->timestamp_begin;
 669
 670                         packet_index = &g_array_index(pos->packet_real_index,
 671                                         struct packet_index, pos->cur_index);
 672                         file_stream->parent.prev_real_timestamp_end =
 673                                                 packet_index->timestamp_end;
 674                         file_stream->parent.prev_real_timestamp =
 675                                 packet_index->timestamp_begin;
 676
 677                         events_discarded_diff = packet_index->events_discarded;
 678                         if (pos->cur_index > 0) {
 679                                 packet_index = &g_array_index(pos->packet_real_index,
 680                                                 struct packet_index,
 681                                                 pos->cur_index - 1);
 682                                 events_discarded_diff -= packet_index->events_discarded;
 683                                 /*
 684                                  * Deal with 32-bit wrap-around if the
 685                                  * tracer provided a 32-bit field.
 686                                  */
 687                                 if (packet_index->events_discarded_len == 32) {
 688                                         events_discarded_diff = (uint32_t) events_discarded_diff;
 689                                 }
 690                         }
 691                         file_stream->parent.events_discarded = events_discarded_diff;
 692                         file_stream->parent.prev_real_timestamp = file_stream->parent.real_timestamp;
 693                         file_stream->parent.prev_cycles_timestamp = file_stream->parent.cycles_timestamp;
 694                         /* The reader will expect us to skip padding */
 695                         ++pos->cur_index;
 696                         break;
 697                 }
 698                 case SEEK_SET:
 699                         pos->cur_index = index;
 700                         file_stream->parent.prev_real_timestamp = 0;
 701                         file_stream->parent.prev_real_timestamp_end = 0;
 702                         file_stream->parent.prev_cycles_timestamp = 0;
 703                         file_stream->parent.prev_cycles_timestamp_end = 0;
 704                         break;
 705                 default:
 706                         assert(0);
 707                 }
 708                 if (pos->cur_index >= pos->packet_real_index->len) {
 709                         /*
 710                          * When a stream reaches the end of the
 711                          * file, we need to show the number of
 712                          * events discarded ourselves, because
 713                          * there is no next event scheduled to
 714                          * be printed in the output.
 715                          */
 716                         if (file_stream->parent.events_discarded) {
 717                                 /*
 718                                  * We need to check if we are in trace
 719                                  * read or called from packet indexing.
 720                                  * In this last case, the collection is
 721                                  * not there, so we cannot print the
 722                                  * timestamps.
 723                                  */
 724                                 if ((&file_stream->parent)->stream_class->trace->collection) {
 725                                         fflush(stdout);
 726                                         fprintf(stderr, "[warning] Tracer discarded %" PRIu64 " events at end of stream between [",
 727                                                         file_stream->parent.events_discarded);
 728                                         if (opt_clock_cycles) {
 729                                                 ctf_print_timestamp(stderr,
 730                                                                 &file_stream->parent,
 731                                                                 file_stream->parent.prev_cycles_timestamp);
 732                                                 fprintf(stderr, "] and [");
 733                                                 ctf_print_timestamp(stderr, &file_stream->parent,
 734                                                                 file_stream->parent.prev_cycles_timestamp_end);
 735                                         } else {
 736                                                 ctf_print_timestamp(stderr,
 737                                                                 &file_stream->parent,
 738                                                                 file_stream->parent.prev_real_timestamp);
 739                                                 fprintf(stderr, "] and [");
 740                                                 ctf_print_timestamp(stderr, &file_stream->parent,
 741                                                                 file_stream->parent.prev_real_timestamp_end);
 742                                         }
 743                                         fprintf(stderr, "]. You should consider recording a new trace with larger buffers or with fewer events enabled.\n");
 744                                         fflush(stderr);
 745                                 }
 746                                 file_stream->parent.events_discarded = 0;
 747                         }
 748                         pos->offset = EOF;
 749                         return;
 750                 }
 751                 packet_index = &g_array_index(pos->packet_cycles_index,
 752                                 struct packet_index,
 753                                 pos->cur_index);
 754                 file_stream->parent.cycles_timestamp = packet_index->timestamp_begin;
 755
 756                 packet_index = &g_array_index(pos->packet_real_index,
 757                                 struct packet_index,
 758                                 pos->cur_index);
 759                 file_stream->parent.real_timestamp = packet_index->timestamp_begin;
 760                 pos->mmap_offset = packet_index->offset;
 761
 762                 /* Lookup context/packet size in index */
 763                 pos->content_size = packet_index->content_size;
 764                 pos->packet_size = packet_index->packet_size;
 765                 if (packet_index->data_offset < packet_index->content_size) {
 766                         pos->offset = 0;        /* will read headers */
 767                 } else if (packet_index->data_offset == packet_index->content_size) {
 768                         /* empty packet */
 769                         pos->offset = packet_index->data_offset;
 770                         whence = SEEK_CUR;
 771                         goto read_next_packet;
 772                 } else {
 773                         pos->offset = EOF;
 774                         return;
 775                 }
 776         }
 777         /* map new base. Need mapping length from header. */
 778         pos->base_mma = mmap_align(pos->packet_size / CHAR_BIT, pos->prot,
 779                         pos->flags, pos->fd, pos->mmap_offset);
 780         if (pos->base_mma == MAP_FAILED) {
 781                 fprintf(stderr, "[error] mmap error %s.\n",
 782                         strerror(errno));
 783                 assert(0);
 784         }
 785
 786         /* update trace_packet_header and stream_packet_context */
 787         if (pos->prot != PROT_WRITE && file_stream->parent.trace_packet_header) {
 788                 /* Read packet header */
 789                 ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
 790                 assert(!ret);
 791         }
 792         if (pos->prot != PROT_WRITE && file_stream->parent.stream_packet_context) {
 793                 /* Read packet context */
 794                 ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
 795                 assert(!ret);
 796         }
 797 }
 798
 799 static
 800 int packet_metadata(struct ctf_trace *td, FILE *fp)
 801 {
 802         uint32_t magic;
 803         size_t len;
 804         int ret = 0;
 805
 806         len = fread(&magic, sizeof(magic), 1, fp);
 807         if (len != 1) {
 808                 goto end;
 809         }
 810         if (magic == TSDL_MAGIC) {
 811                 ret = 1;
 812                 td->byte_order = BYTE_ORDER;
 813                 CTF_TRACE_SET_FIELD(td, byte_order);
 814         } else if (magic == GUINT32_SWAP_LE_BE(TSDL_MAGIC)) {
 815                 ret = 1;
 816                 td->byte_order = (BYTE_ORDER == BIG_ENDIAN) ?
 817                                         LITTLE_ENDIAN : BIG_ENDIAN;
 818                 CTF_TRACE_SET_FIELD(td, byte_order);
 819         }
 820 end:
 821         rewind(fp);
 822         return ret;
 823 }
 824
 825 /*
 826  * Returns 0 on success, -1 on error.
 827  */
 828 static
 829 int check_version(unsigned int major, unsigned int minor)
 830 {
 831         switch (major) {
 832         case 1:
 833                 switch (minor) {
 834                 case 8:
 835                         return 0;
 836                 default:
 837                         goto warning;
 838                 }
 839         default:
 840                 goto warning;
 841
 842         }
 843
 844         /* eventually return an error instead of warning */
 845 warning:
 846         fprintf(stderr, "[warning] Unsupported CTF specification version %u.%u. Trying anyway.\n",
 847                 major, minor);
 848         return 0;
 849 }
 850
 851 static
 852 int ctf_open_trace_metadata_packet_read(struct ctf_trace *td, FILE *in,
 853                                         FILE *out)
 854 {
 855         struct metadata_packet_header header;
 856         size_t readlen, writelen, toread;
 857         char buf[4096 + 1];     /* + 1 for debug-mode \0 */
 858         int ret = 0;
 859
 860         readlen = fread(&header, header_sizeof(header), 1, in);
 861         if (readlen < 1)
 862                 return -EINVAL;
 863
 864         if (td->byte_order != BYTE_ORDER) {
 865                 header.magic = GUINT32_SWAP_LE_BE(header.magic);
 866                 header.checksum = GUINT32_SWAP_LE_BE(header.checksum);
 867                 header.content_size = GUINT32_SWAP_LE_BE(header.content_size);
 868                 header.packet_size = GUINT32_SWAP_LE_BE(header.packet_size);
 869         }
 870         if (header.checksum)
 871                 fprintf(stderr, "[warning] checksum verification not supported yet.\n");
 872         if (header.compression_scheme) {
 873                 fprintf(stderr, "[error] compression (%u) not supported yet.\n",
 874                         header.compression_scheme);
 875                 return -EINVAL;
 876         }
 877         if (header.encryption_scheme) {
 878                 fprintf(stderr, "[error] encryption (%u) not supported yet.\n",
 879                         header.encryption_scheme);
 880                 return -EINVAL;
 881         }
 882         if (header.checksum_scheme) {
 883                 fprintf(stderr, "[error] checksum (%u) not supported yet.\n",
 884                         header.checksum_scheme);
 885                 return -EINVAL;
 886         }
 887         if (check_version(header.major, header.minor) < 0)
 888                 return -EINVAL;
 889         if (!CTF_TRACE_FIELD_IS_SET(td, uuid)) {
 890                 memcpy(td->uuid, header.uuid, sizeof(header.uuid));
 891                 CTF_TRACE_SET_FIELD(td, uuid);
 892         } else {
 893                 if (babeltrace_uuid_compare(header.uuid, td->uuid))
 894                         return -EINVAL;
 895         }
 896
 897         toread = (header.content_size / CHAR_BIT) - header_sizeof(header);
 898
 899         for (;;) {
 900                 readlen = fread(buf, sizeof(char), min(sizeof(buf) - 1, toread), in);
 901                 if (ferror(in)) {
 902                         ret = -EINVAL;
 903                         break;
 904                 }
 905                 if (babeltrace_debug) {
 906                         buf[readlen] = '\0';
 907                         fprintf(stderr, "[debug] metadata packet read: %s\n",
 908                                 buf);
 909                 }
 910
 911                 writelen = fwrite(buf, sizeof(char), readlen, out);
 912                 if (writelen < readlen) {
 913                         ret = -EIO;
 914                         break;
 915                 }
 916                 if (ferror(out)) {
 917                         ret = -EINVAL;
 918                         break;
 919                 }
 920                 toread -= readlen;
 921                 if (!toread) {
 922                         ret = 0;        /* continue reading next packet */
 923                         goto read_padding;
 924                 }
 925         }
 926         return ret;
 927
 928 read_padding:
 929         toread = (header.packet_size - header.content_size) / CHAR_BIT;
 930         ret = fseek(in, toread, SEEK_CUR);
 931         if (ret < 0) {
 932                 fprintf(stderr, "[warning] Missing padding at end of file\n");
 933                 ret = 0;
 934         }
 935         return ret;
 936 }
 937
 938 static
 939 int ctf_open_trace_metadata_stream_read(struct ctf_trace *td, FILE **fp,
 940                                         char **buf)
 941 {
 942         FILE *in, *out;
 943         size_t size;
 944         int ret;
 945
 946         in = *fp;
 947         /*
 948          * Using strlen on *buf instead of size of open_memstream
 949          * because its size includes garbage at the end (after final
 950          * \0). This is the allocated size, not the actual string size.
 951          */
 952         out = babeltrace_open_memstream(buf, &size);
 953         if (out == NULL) {
 954                 perror("Metadata open_memstream");
 955                 return -errno;
 956         }
 957         for (;;) {
 958                 ret = ctf_open_trace_metadata_packet_read(td, in, out);
 959                 if (ret) {
 960                         break;
 961                 }
 962                 if (feof(in)) {
 963                         ret = 0;
 964                         break;
 965                 }
 966         }
 967         /* close to flush the buffer */
 968         ret = babeltrace_close_memstream(buf, &size, out);
 969         if (ret < 0) {
 970                 perror("babeltrace_flush_memstream");
 971                 fclose(in);
 972                 return -errno;
 973         }
 974         fclose(in);
 975         /* open for reading */
 976         *fp = babeltrace_fmemopen(*buf, strlen(*buf), "rb");
 977         if (!*fp) {
 978                 perror("Metadata fmemopen");
 979                 return -errno;
 980         }
 981         return 0;
 982 }
 983
 984 static
 985 int ctf_open_trace_metadata_read(struct ctf_trace *td,
 986                 void (*packet_seek)(struct stream_pos *pos, size_t index,
 987                         int whence), FILE *metadata_fp)
 988 {
 989         struct ctf_scanner *scanner;
 990         struct ctf_file_stream *metadata_stream;
 991         FILE *fp;
 992         char *buf = NULL;
 993         int ret = 0;
 994
 995         metadata_stream = g_new0(struct ctf_file_stream, 1);
 996         metadata_stream->pos.last_offset = LAST_OFFSET_POISON;
 997
 998         if (packet_seek) {
 999                 metadata_stream->pos.packet_seek = packet_seek;
1000         } else {
1001                 fprintf(stderr, "[error] packet_seek function undefined.\n");
1002                 ret = -1;
1003                 goto end_stream;
1004         }
1005
1006         if (metadata_fp) {
1007                 fp = metadata_fp;
1008         } else {
1009                 td->metadata = &metadata_stream->parent;
1010                 metadata_stream->pos.fd = openat(td->dirfd, "metadata", O_RDONLY);
1011                 if (metadata_stream->pos.fd < 0) {
1012                         fprintf(stderr, "Unable to open metadata.\n");
1013                         return metadata_stream->pos.fd;
1014                 }
1015
1016                 fp = fdopen(metadata_stream->pos.fd, "r");
1017                 if (!fp) {
1018                         fprintf(stderr, "[error] Unable to open metadata stream.\n");
1019                         perror("Metadata stream open");
1020                         ret = -errno;
1021                         goto end_stream;
1022                 }
1023         }
1024         if (babeltrace_debug)
1025                 yydebug = 1;
1026
1027         if (packet_metadata(td, fp)) {
1028                 ret = ctf_open_trace_metadata_stream_read(td, &fp, &buf);
1029                 if (ret)
1030                         goto end_packet_read;
1031         } else {
1032                 unsigned int major, minor;
1033                 ssize_t nr_items;
1034
1035                 td->byte_order = BYTE_ORDER;
1036
1037                 /* Check text-only metadata header and version */
1038                 nr_items = fscanf(fp, "/* CTF %u.%u", &major, &minor);
1039                 if (nr_items < 2)
1040                         fprintf(stderr, "[warning] Ill-shapen or missing \"/* CTF x.y\" header for text-only metadata.\n");
1041                 if (check_version(major, minor) < 0) {
1042                         ret = -EINVAL;
1043                         goto end_packet_read;
1044                 }
1045                 rewind(fp);
1046         }
1047
1048         scanner = ctf_scanner_alloc(fp);
1049         if (!scanner) {
1050                 fprintf(stderr, "[error] Error allocating scanner\n");
1051                 ret = -ENOMEM;
1052                 goto end_scanner_alloc;
1053         }
1054         ret = ctf_scanner_append_ast(scanner);
1055         if (ret) {
1056                 fprintf(stderr, "[error] Error creating AST\n");
1057                 goto end;
1058         }
1059
1060         if (babeltrace_debug) {
1061                 ret = ctf_visitor_print_xml(stderr, 0, &scanner->ast->root);
1062                 if (ret) {
1063                         fprintf(stderr, "[error] Error visiting AST for XML output\n");
1064                         goto end;
1065                 }
1066         }
1067
1068         ret = ctf_visitor_semantic_check(stderr, 0, &scanner->ast->root);
1069         if (ret) {
1070                 fprintf(stderr, "[error] Error in CTF semantic validation %d\n", ret);
1071                 goto end;
1072         }
1073         ret = ctf_visitor_construct_metadata(stderr, 0, &scanner->ast->root,
1074                         td, td->byte_order);
1075         if (ret) {
1076                 fprintf(stderr, "[error] Error in CTF metadata constructor %d\n", ret);
1077                 goto end;
1078         }
1079 end:
1080         ctf_scanner_free(scanner);
1081 end_scanner_alloc:
1082 end_packet_read:
1083         if (fp)
1084                 fclose(fp);
1085         free(buf);
1086 end_stream:
1087         close(metadata_stream->pos.fd);
1088         if (ret)
1089                 g_free(metadata_stream);
1090         return ret;
1091 }
1092
1093 static
1094 struct ctf_event_definition *create_event_definitions(struct ctf_trace *td,
1095                                                   struct ctf_stream_definition *stream,
1096                                                   struct ctf_event_declaration *event)
1097 {
1098         struct ctf_event_definition *stream_event = g_new0(struct ctf_event_definition, 1);
1099
1100         if (event->context_decl) {
1101                 struct definition *definition =
1102                         event->context_decl->p.definition_new(&event->context_decl->p,
1103                                 stream->parent_def_scope, 0, 0, "event.context");
1104                 if (!definition) {
1105                         goto error;
1106                 }
1107                 stream_event->event_context = container_of(definition,
1108                                         struct definition_struct, p);
1109                 stream->parent_def_scope = stream_event->event_context->p.scope;
1110         }
1111         if (event->fields_decl) {
1112                 struct definition *definition =
1113                         event->fields_decl->p.definition_new(&event->fields_decl->p,
1114                                 stream->parent_def_scope, 0, 0, "event.fields");
1115                 if (!definition) {
1116                         goto error;
1117                 }
1118                 stream_event->event_fields = container_of(definition,
1119                                         struct definition_struct, p);
1120                 stream->parent_def_scope = stream_event->event_fields->p.scope;
1121         }
1122         stream_event->stream = stream;
1123         return stream_event;
1124
1125 error:
1126         if (stream_event->event_fields)
1127                 definition_unref(&stream_event->event_fields->p);
1128         if (stream_event->event_context)
1129                 definition_unref(&stream_event->event_context->p);
1130         return NULL;
1131 }
1132
1133 static
1134 int create_stream_definitions(struct ctf_trace *td, struct ctf_stream_definition *stream)
1135 {
1136         struct ctf_stream_declaration *stream_class;
1137         int ret;
1138         int i;
1139
1140         if (stream->stream_definitions_created)
1141                 return 0;
1142
1143         stream_class = stream->stream_class;
1144
1145         if (stream_class->packet_context_decl) {
1146                 struct definition *definition =
1147                         stream_class->packet_context_decl->p.definition_new(&stream_class->packet_context_decl->p,
1148                                 stream->parent_def_scope, 0, 0, "stream.packet.context");
1149                 if (!definition) {
1150                         ret = -EINVAL;
1151                         goto error;
1152                 }
1153                 stream->stream_packet_context = container_of(definition,
1154                                                 struct definition_struct, p);
1155                 stream->parent_def_scope = stream->stream_packet_context->p.scope;
1156         }
1157         if (stream_class->event_header_decl) {
1158                 struct definition *definition =
1159                         stream_class->event_header_decl->p.definition_new(&stream_class->event_header_decl->p,
1160                                 stream->parent_def_scope, 0, 0, "stream.event.header");
1161                 if (!definition) {
1162                         ret = -EINVAL;
1163                         goto error;
1164                 }
1165                 stream->stream_event_header =
1166                         container_of(definition, struct definition_struct, p);
1167                 stream->parent_def_scope = stream->stream_event_header->p.scope;
1168         }
1169         if (stream_class->event_context_decl) {
1170                 struct definition *definition =
1171                         stream_class->event_context_decl->p.definition_new(&stream_class->event_context_decl->p,
1172                                 stream->parent_def_scope, 0, 0, "stream.event.context");
1173                 if (!definition) {
1174                         ret = -EINVAL;
1175                         goto error;
1176                 }
1177                 stream->stream_event_context =
1178                         container_of(definition, struct definition_struct, p);
1179                 stream->parent_def_scope = stream->stream_event_context->p.scope;
1180         }
1181         stream->events_by_id = g_ptr_array_new();
1182         g_ptr_array_set_size(stream->events_by_id, stream_class->events_by_id->len);
1183         for (i = 0; i < stream->events_by_id->len; i++) {
1184                 struct ctf_event_declaration *event = g_ptr_array_index(stream_class->events_by_id, i);
1185                 struct ctf_event_definition *stream_event;
1186
1187                 if (!event)
1188                         continue;
1189                 stream_event = create_event_definitions(td, stream, event);
1190                 if (!stream_event)
1191                         goto error_event;
1192                 g_ptr_array_index(stream->events_by_id, i) = stream_event;
1193         }
1194         return 0;
1195
1196 error_event:
1197         for (i = 0; i < stream->events_by_id->len; i++) {
1198                 struct ctf_event_definition *stream_event = g_ptr_array_index(stream->events_by_id, i);
1199                 if (stream_event)
1200                         g_free(stream_event);
1201         }
1202         g_ptr_array_free(stream->events_by_id, TRUE);
1203 error:
1204         if (stream->stream_event_context)
1205                 definition_unref(&stream->stream_event_context->p);
1206         if (stream->stream_event_header)
1207                 definition_unref(&stream->stream_event_header->p);
1208         if (stream->stream_packet_context)
1209                 definition_unref(&stream->stream_packet_context->p);
1210         return ret;
1211 }
1212
1213
1214 static
1215 int create_stream_packet_index(struct ctf_trace *td,
1216                                struct ctf_file_stream *file_stream)
1217 {
1218         struct ctf_stream_declaration *stream;
1219         int len_index;
1220         struct ctf_stream_pos *pos;
1221         struct stat filestats;
1222         struct packet_index packet_index;
1223         int first_packet = 1;
1224         int ret;
1225
1226         pos = &file_stream->pos;
1227
1228         ret = fstat(pos->fd, &filestats);
1229         if (ret < 0)
1230                 return ret;
1231
1232         if (filestats.st_size < MAX_PACKET_HEADER_LEN / CHAR_BIT)
1233                 return -EINVAL;
1234
1235         for (pos->mmap_offset = 0; pos->mmap_offset < filestats.st_size; ) {
1236                 uint64_t stream_id = 0;
1237
1238                 if (pos->base_mma) {
1239                         /* unmap old base */
1240                         ret = munmap_align(pos->base_mma);
1241                         if (ret) {
1242                                 fprintf(stderr, "[error] Unable to unmap old base: %s.\n",
1243                                         strerror(errno));
1244                                 return ret;
1245                         }
1246                         pos->base_mma = NULL;
1247                 }
1248                 /* map new base. Need mapping length from header. */
1249                 pos->base_mma = mmap_align(MAX_PACKET_HEADER_LEN / CHAR_BIT, PROT_READ,
1250                                  MAP_PRIVATE, pos->fd, pos->mmap_offset);
1251                 assert(pos->base_mma != MAP_FAILED);
1252                 pos->content_size = MAX_PACKET_HEADER_LEN;      /* Unknown at this point */
1253                 pos->packet_size = MAX_PACKET_HEADER_LEN;       /* Unknown at this point */
1254                 pos->offset = 0;        /* Position of the packet header */
1255
1256                 packet_index.offset = pos->mmap_offset;
1257                 packet_index.content_size = 0;
1258                 packet_index.packet_size = 0;
1259                 packet_index.timestamp_begin = 0;
1260                 packet_index.timestamp_end = 0;
1261                 packet_index.events_discarded = 0;
1262
1263                 /* read and check header, set stream id (and check) */
1264                 if (file_stream->parent.trace_packet_header) {
1265                         /* Read packet header */
1266                         ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
1267                         if (ret)
1268                                 return ret;
1269                         len_index = struct_declaration_lookup_field_index(file_stream->parent.trace_packet_header->declaration, g_quark_from_static_string("magic"));
1270                         if (len_index >= 0) {
1271                                 struct definition *field;
1272                                 uint64_t magic;
1273
1274                                 field = struct_definition_get_field_from_index(file_stream->parent.trace_packet_header, len_index);
1275                                 magic = get_unsigned_int(field);
1276                                 if (magic != CTF_MAGIC) {
1277                                         fprintf(stderr, "[error] Invalid magic number 0x%" PRIX64 " at packet %u (file offset %zd).\n",
1278                                                         magic,
1279                                                         file_stream->pos.packet_cycles_index->len,
1280                                                         (ssize_t) pos->mmap_offset);
1281                                         return -EINVAL;
1282                                 }
1283                         }
1284
1285                         /* check uuid */
1286                         len_index = struct_declaration_lookup_field_index(file_stream->parent.trace_packet_header->declaration, g_quark_from_static_string("uuid"));
1287                         if (len_index >= 0) {
1288                                 struct definition_array *defarray;
1289                                 struct definition *field;
1290                                 uint64_t i;
1291                                 uint8_t uuidval[BABELTRACE_UUID_LEN];
1292
1293                                 field = struct_definition_get_field_from_index(file_stream->parent.trace_packet_header, len_index);
1294                                 assert(field->declaration->id == CTF_TYPE_ARRAY);
1295                                 defarray = container_of(field, struct definition_array, p);
1296                                 assert(array_len(defarray) == BABELTRACE_UUID_LEN);
1297
1298                                 for (i = 0; i < BABELTRACE_UUID_LEN; i++) {
1299                                         struct definition *elem;
1300
1301                                         elem = array_index(defarray, i);
1302                                         uuidval[i] = get_unsigned_int(elem);
1303                                 }
1304                                 ret = babeltrace_uuid_compare(td->uuid, uuidval);
1305                                 if (ret) {
1306                                         fprintf(stderr, "[error] Unique Universal Identifiers do not match.\n");
1307                                         return -EINVAL;
1308                                 }
1309                         }
1310
1311
1312                         len_index = struct_declaration_lookup_field_index(file_stream->parent.trace_packet_header->declaration, g_quark_from_static_string("stream_id"));
1313                         if (len_index >= 0) {
1314                                 struct definition *field;
1315
1316                                 field = struct_definition_get_field_from_index(file_stream->parent.trace_packet_header, len_index);
1317                                 stream_id = get_unsigned_int(field);
1318                         }
1319                 }
1320
1321                 if (!first_packet && file_stream->parent.stream_id != stream_id) {
1322                         fprintf(stderr, "[error] Stream ID is changing within a stream.\n");
1323                         return -EINVAL;
1324                 }
1325                 if (first_packet) {
1326                         file_stream->parent.stream_id = stream_id;
1327                         if (stream_id >= td->streams->len) {
1328                                 fprintf(stderr, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
1329                                 return -EINVAL;
1330                         }
1331                         stream = g_ptr_array_index(td->streams, stream_id);
1332                         if (!stream) {
1333                                 fprintf(stderr, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
1334                                 return -EINVAL;
1335                         }
1336                         file_stream->parent.stream_class = stream;
1337                         ret = create_stream_definitions(td, &file_stream->parent);
1338                         if (ret)
1339                                 return ret;
1340                 }
1341                 first_packet = 0;
1342
1343                 if (file_stream->parent.stream_packet_context) {
1344                         /* Read packet context */
1345                         ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
1346                         if (ret)
1347                                 return ret;
1348                         /* read content size from header */
1349                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("content_size"));
1350                         if (len_index >= 0) {
1351                                 struct definition *field;
1352
1353                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
1354                                 packet_index.content_size = get_unsigned_int(field);
1355                         } else {
1356                                 /* Use file size for packet size */
1357                                 packet_index.content_size = filestats.st_size * CHAR_BIT;
1358                         }
1359
1360                         /* read packet size from header */
1361                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("packet_size"));
1362                         if (len_index >= 0) {
1363                                 struct definition *field;
1364
1365                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
1366                                 packet_index.packet_size = get_unsigned_int(field);
1367                         } else {
1368                                 /* Use content size if non-zero, else file size */
1369                                 packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
1370                         }
1371
1372                         /* read timestamp begin from header */
1373                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("timestamp_begin"));
1374                         if (len_index >= 0) {
1375                                 struct definition *field;
1376
1377                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
1378                                 packet_index.timestamp_begin = get_unsigned_int(field);
1379                                 if (file_stream->parent.stream_class->trace->collection) {
1380                                         packet_index.timestamp_begin =
1381                                                 ctf_get_real_timestamp(
1382                                                         &file_stream->parent,
1383                                                         packet_index.timestamp_begin);
1384                                 }
1385                         }
1386
1387                         /* read timestamp end from header */
1388                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("timestamp_end"));
1389                         if (len_index >= 0) {
1390                                 struct definition *field;
1391
1392                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
1393                                 packet_index.timestamp_end = get_unsigned_int(field);
1394                                 if (file_stream->parent.stream_class->trace->collection) {
1395                                         packet_index.timestamp_end =
1396                                                 ctf_get_real_timestamp(
1397                                                         &file_stream->parent,
1398                                                         packet_index.timestamp_end);
1399                                 }
1400                         }
1401
1402                         /* read events discarded from header */
1403                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("events_discarded"));
1404                         if (len_index >= 0) {
1405                                 struct definition *field;
1406
1407                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
1408                                 packet_index.events_discarded = get_unsigned_int(field);
1409                                 packet_index.events_discarded_len = get_int_len(field);
1410                         }
1411                 } else {
1412                         /* Use file size for packet size */
1413                         packet_index.content_size = filestats.st_size * CHAR_BIT;
1414                         /* Use content size if non-zero, else file size */
1415                         packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
1416                 }
1417
1418                 /* Validate content size and packet size values */
1419                 if (packet_index.content_size > packet_index.packet_size) {
1420                         fprintf(stderr, "[error] Content size (%" PRIu64 " bits) is larger than packet size (%" PRIu64 " bits).\n",
1421                                 packet_index.content_size, packet_index.packet_size);
1422                         return -EINVAL;
1423                 }
1424
1425                 if (packet_index.packet_size > ((uint64_t)filestats.st_size - packet_index.offset) * CHAR_BIT) {
1426                         fprintf(stderr, "[error] Packet size (%" PRIu64 " bits) is larger than remaining file size (%" PRIu64 " bits).\n",
1427                                 packet_index.packet_size, ((uint64_t)filestats.st_size - packet_index.offset) * CHAR_BIT);
1428                         return -EINVAL;
1429                 }
1430
1431                 /* Save position after header and context */
1432                 packet_index.data_offset = pos->offset;
1433
1434                 /* add index to packet array */
1435                 g_array_append_val(file_stream->pos.packet_cycles_index, packet_index);
1436
1437                 pos->mmap_offset += packet_index.packet_size / CHAR_BIT;
1438         }
1439
1440         return 0;
1441 }
1442
1443 static
1444 int create_trace_definitions(struct ctf_trace *td, struct ctf_stream_definition *stream)
1445 {
1446         int ret;
1447
1448         if (td->packet_header_decl) {
1449                 struct definition *definition =
1450                         td->packet_header_decl->p.definition_new(&td->packet_header_decl->p,
1451                                 stream->parent_def_scope, 0, 0, "trace.packet.header");
1452                 if (!definition) {
1453                         ret = -EINVAL;
1454                         goto error;
1455                 }
1456                 stream->trace_packet_header =
1457                         container_of(definition, struct definition_struct, p);
1458                 stream->parent_def_scope = stream->trace_packet_header->p.scope;
1459         }
1460
1461         return 0;
1462
1463 error:
1464         return ret;
1465 }
1466
1467 /*
1468  * Note: many file streams can inherit from the same stream class
1469  * description (metadata).
1470  */
1471 static
1472 int ctf_open_file_stream_read(struct ctf_trace *td, const char *path, int flags,
1473                 void (*packet_seek)(struct stream_pos *pos, size_t index,
1474                         int whence))
1475 {
1476         int ret, fd;
1477         struct ctf_file_stream *file_stream;
1478         struct stat statbuf;
1479
1480         fd = openat(td->dirfd, path, flags);
1481         if (fd < 0) {
1482                 perror("File stream openat()");
1483                 ret = fd;
1484                 goto error;
1485         }
1486
1487         /* Don't try to mmap subdirectories. Skip them, return success. */
1488         ret = fstat(fd, &statbuf);
1489         if (ret) {
1490                 perror("File stream fstat()");
1491                 goto fstat_error;
1492         }
1493         if (S_ISDIR(statbuf.st_mode)) {
1494                 fprintf(stderr, "[warning] Skipping directory '%s' found in trace\n", path);
1495                 ret = 0;
1496                 goto fd_is_dir_ok;
1497         }
1498
1499         file_stream = g_new0(struct ctf_file_stream, 1);
1500         file_stream->pos.last_offset = LAST_OFFSET_POISON;
1501
1502         if (packet_seek) {
1503                 file_stream->pos.packet_seek = packet_seek;
1504         } else {
1505                 fprintf(stderr, "[error] packet_seek function undefined.\n");
1506                 ret = -1;
1507                 goto error_def;
1508         }
1509
1510         ctf_init_pos(&file_stream->pos, fd, flags);
1511         ret = create_trace_definitions(td, &file_stream->parent);
1512         if (ret)
1513                 goto error_def;
1514         /*
1515          * For now, only a single slock is supported.
1516          */
1517         file_stream->parent.current_clock = td->single_clock;
1518         ret = create_stream_packet_index(td, file_stream);
1519         if (ret)
1520                 goto error_index;
1521         /* Add stream file to stream class */
1522         g_ptr_array_add(file_stream->parent.stream_class->streams,
1523                         &file_stream->parent);
1524         return 0;
1525
1526 error_index:
1527         if (file_stream->parent.trace_packet_header)
1528                 definition_unref(&file_stream->parent.trace_packet_header->p);
1529 error_def:
1530         ctf_fini_pos(&file_stream->pos);
1531         g_free(file_stream);
1532 fd_is_dir_ok:
1533 fstat_error:
1534         close(fd);
1535 error:
1536         return ret;
1537 }
1538
1539 static
1540 int ctf_open_trace_read(struct ctf_trace *td,
1541                 const char *path, int flags,
1542                 void (*packet_seek)(struct stream_pos *pos, size_t index,
1543                         int whence), FILE *metadata_fp)
1544 {
1545         int ret;
1546         struct dirent *dirent;
1547         struct dirent *diriter;
1548         size_t dirent_len;
1549
1550         td->flags = flags;
1551
1552         /* Open trace directory */
1553         td->dir = opendir(path);
1554         if (!td->dir) {
1555                 fprintf(stderr, "[error] Unable to open trace directory \"%s\".\n", path);
1556                 ret = -ENOENT;
1557                 goto error;
1558         }
1559
1560         td->dirfd = open(path, 0);
1561         if (td->dirfd < 0) {
1562                 fprintf(stderr, "[error] Unable to open trace directory file descriptor for path \"%s\".\n", path);
1563                 perror("Trace directory open");
1564                 ret = -errno;
1565                 goto error_dirfd;
1566         }
1567         strncpy(td->path, path, sizeof(td->path));
1568         td->path[sizeof(td->path) - 1] = '\0';
1569
1570         /*
1571          * Keep the metadata file separate.
1572          */
1573
1574         ret = ctf_open_trace_metadata_read(td, packet_seek, metadata_fp);
1575         if (ret) {
1576                 fprintf(stderr, "[warning] Unable to open trace metadata for path \"%s\".\n", path);
1577                 goto error_metadata;
1578         }
1579
1580         /*
1581          * Open each stream: for each file, try to open, check magic
1582          * number, and get the stream ID to add to the right location in
1583          * the stream array.
1584          */
1585
1586         dirent_len = offsetof(struct dirent, d_name) +
1587                         fpathconf(td->dirfd, _PC_NAME_MAX) + 1;
1588
1589         dirent = malloc(dirent_len);
1590
1591         for (;;) {
1592                 ret = readdir_r(td->dir, dirent, &diriter);
1593                 if (ret) {
1594                         fprintf(stderr, "[error] Readdir error.\n");
1595                         goto readdir_error;
1596                 }
1597                 if (!diriter)
1598                         break;
1599                 /* Ignore hidden files, ., .. and metadata. */
1600                 if (!strncmp(diriter->d_name, ".", 1)
1601                                 || !strcmp(diriter->d_name, "..")
1602                                 || !strcmp(diriter->d_name, "metadata"))
1603                         continue;
1604                 ret = ctf_open_file_stream_read(td, diriter->d_name,
1605                                         flags, packet_seek);
1606                 if (ret) {
1607                         fprintf(stderr, "[error] Open file stream error.\n");
1608                         goto readdir_error;
1609                 }
1610         }
1611
1612         free(dirent);
1613         return 0;
1614
1615 readdir_error:
1616         free(dirent);
1617 error_metadata:
1618         close(td->dirfd);
1619 error_dirfd:
1620         closedir(td->dir);
1621 error:
1622         return ret;
1623 }
1624
1625 /*
1626  * ctf_open_trace: Open a CTF trace and index it.
1627  * Note that the user must seek the trace after the open (using the iterator)
1628  * since the index creation read it entirely.
1629  */
1630 static
1631 struct trace_descriptor *ctf_open_trace(const char *path, int flags,
1632                 void (*packet_seek)(struct stream_pos *pos, size_t index,
1633                         int whence), FILE *metadata_fp)
1634 {
1635         struct ctf_trace *td;
1636         int ret;
1637
1638         /*
1639          * If packet_seek is NULL, we provide our default version.
1640          */
1641         if (!packet_seek)
1642                 packet_seek = ctf_packet_seek;
1643
1644         td = g_new0(struct ctf_trace, 1);
1645
1646         switch (flags & O_ACCMODE) {
1647         case O_RDONLY:
1648                 if (!path) {
1649                         fprintf(stderr, "[error] Path missing for input CTF trace.\n");
1650                         goto error;
1651                 }
1652                 ret = ctf_open_trace_read(td, path, flags, packet_seek, metadata_fp);
1653                 if (ret)
1654                         goto error;
1655                 break;
1656         case O_RDWR:
1657                 fprintf(stderr, "[error] Opening CTF traces for output is not supported yet.\n");
1658                 goto error;
1659         default:
1660                 fprintf(stderr, "[error] Incorrect open flags.\n");
1661                 goto error;
1662         }
1663
1664         return &td->parent;
1665 error:
1666         g_free(td);
1667         return NULL;
1668 }
1669
1670
1671 void ctf_init_mmap_pos(struct ctf_stream_pos *pos,
1672                 struct mmap_stream *mmap_info)
1673 {
1674         pos->mmap_offset = 0;
1675         pos->packet_size = 0;
1676         pos->content_size = 0;
1677         pos->content_size_loc = NULL;
1678         pos->fd = mmap_info->fd;
1679         pos->base_mma = NULL;
1680         pos->offset = 0;
1681         pos->dummy = false;
1682         pos->cur_index = 0;
1683         pos->packet_cycles_index = NULL;
1684         pos->packet_real_index = NULL;
1685         pos->prot = PROT_READ;
1686         pos->flags = MAP_PRIVATE;
1687         pos->parent.rw_table = read_dispatch_table;
1688         pos->parent.event_cb = ctf_read_event;
1689 }
1690
1691 static
1692 int prepare_mmap_stream_definition(struct ctf_trace *td,
1693                 struct ctf_file_stream *file_stream)
1694 {
1695         struct ctf_stream_declaration *stream;
1696         uint64_t stream_id = 0;
1697         int ret;
1698
1699         file_stream->parent.stream_id = stream_id;
1700         if (stream_id >= td->streams->len) {
1701                 fprintf(stderr, "[error] Stream %" PRIu64 " is not declared "
1702                                 "in metadata.\n", stream_id);
1703                 ret = -EINVAL;
1704                 goto end;
1705         }
1706         stream = g_ptr_array_index(td->streams, stream_id);
1707         if (!stream) {
1708                 fprintf(stderr, "[error] Stream %" PRIu64 " is not declared "
1709                                 "in metadata.\n", stream_id);
1710                 ret = -EINVAL;
1711                 goto end;
1712         }
1713         file_stream->parent.stream_class = stream;
1714         ret = create_stream_definitions(td, &file_stream->parent);
1715 end:
1716         return ret;
1717 }
1718
1719 static
1720 int ctf_open_mmap_stream_read(struct ctf_trace *td,
1721                 struct mmap_stream *mmap_info,
1722                 void (*packet_seek)(struct stream_pos *pos, size_t index,
1723                         int whence))
1724 {
1725         int ret;
1726         struct ctf_file_stream *file_stream;
1727
1728         file_stream = g_new0(struct ctf_file_stream, 1);
1729         file_stream->pos.last_offset = LAST_OFFSET_POISON;
1730         ctf_init_mmap_pos(&file_stream->pos, mmap_info);
1731
1732         file_stream->pos.packet_seek = packet_seek;
1733
1734         ret = create_trace_definitions(td, &file_stream->parent);
1735         if (ret) {
1736                 goto error_def;
1737         }
1738
1739         ret = prepare_mmap_stream_definition(td, file_stream);
1740         if (ret)
1741                 goto error_index;
1742
1743         /* Add stream file to stream class */
1744         g_ptr_array_add(file_stream->parent.stream_class->streams,
1745                         &file_stream->parent);
1746         return 0;
1747
1748 error_index:
1749         if (file_stream->parent.trace_packet_header)
1750                 definition_unref(&file_stream->parent.trace_packet_header->p);
1751 error_def:
1752         g_free(file_stream);
1753         return ret;
1754 }
1755
1756 int ctf_open_mmap_trace_read(struct ctf_trace *td,
1757                 struct mmap_stream_list *mmap_list,
1758                 void (*packet_seek)(struct stream_pos *pos, size_t index,
1759                         int whence),
1760                 FILE *metadata_fp)
1761 {
1762         int ret;
1763         struct mmap_stream *mmap_info;
1764
1765         ret = ctf_open_trace_metadata_read(td, ctf_packet_seek, metadata_fp);
1766         if (ret) {
1767                 goto error;
1768         }
1769
1770         /*
1771          * for each stream, try to open, check magic number, and get the
1772          * stream ID to add to the right location in the stream array.
1773          */
1774         bt_list_for_each_entry(mmap_info, &mmap_list->head, list) {
1775                 ret = ctf_open_mmap_stream_read(td, mmap_info, packet_seek);
1776                 if (ret) {
1777                         fprintf(stderr, "[error] Open file mmap stream error.\n");
1778                         goto error;
1779                 }
1780         }
1781
1782         return 0;
1783
1784 error:
1785         return ret;
1786 }
1787
1788 static
1789 struct trace_descriptor *ctf_open_mmap_trace(
1790                 struct mmap_stream_list *mmap_list,
1791                 void (*packet_seek)(struct stream_pos *pos, size_t index,
1792                         int whence),
1793                 FILE *metadata_fp)
1794 {
1795         struct ctf_trace *td;
1796         int ret;
1797
1798         if (!metadata_fp) {
1799                 fprintf(stderr, "[error] No metadata file pointer associated, "
1800                                 "required for mmap parsing\n");
1801                 goto error;
1802         }
1803         if (!packet_seek) {
1804                 fprintf(stderr, "[error] packet_seek function undefined.\n");
1805                 goto error;
1806         }
1807         td = g_new0(struct ctf_trace, 1);
1808         ret = ctf_open_mmap_trace_read(td, mmap_list, packet_seek, metadata_fp);
1809         if (ret)
1810                 goto error_free;
1811
1812         return &td->parent;
1813
1814 error_free:
1815         g_free(td);
1816 error:
1817         return NULL;
1818 }
1819
1820 static
1821 int ctf_convert_index_timestamp(struct trace_descriptor *tdp)
1822 {
1823         int i, j, k;
1824         struct ctf_trace *td = container_of(tdp, struct ctf_trace, parent);
1825
1826         /* for each stream_class */
1827         for (i = 0; i < td->streams->len; i++) {
1828                 struct ctf_stream_declaration *stream_class;
1829
1830                 stream_class = g_ptr_array_index(td->streams, i);
1831                 if (!stream_class)
1832                         continue;
1833                 /* for each file_stream */
1834                 for (j = 0; j < stream_class->streams->len; j++) {
1835                         struct ctf_stream_definition *stream;
1836                         struct ctf_stream_pos *stream_pos;
1837                         struct ctf_file_stream *cfs;
1838
1839                         stream = g_ptr_array_index(stream_class->streams, j);
1840                         if (!stream)
1841                                 continue;
1842                         cfs = container_of(stream, struct ctf_file_stream,
1843                                         parent);
1844                         stream_pos = &cfs->pos;
1845                         stream_pos->packet_real_index = g_array_new(FALSE, TRUE,
1846                                         sizeof(struct packet_index));
1847
1848                         for (k = 0; k < stream_pos->packet_cycles_index->len; k++) {
1849                                 struct packet_index *index;
1850                                 struct packet_index new_index;
1851
1852                                 index = &g_array_index(stream_pos->packet_cycles_index,
1853                                                 struct packet_index, k);
1854                                 memcpy(&new_index, index,
1855                                                 sizeof(struct packet_index));
1856                                 new_index.timestamp_begin =
1857                                         ctf_get_real_timestamp(stream,
1858                                                         index->timestamp_begin);
1859                                 new_index.timestamp_end =
1860                                         ctf_get_real_timestamp(stream,
1861                                                         index->timestamp_end);
1862                                 g_array_append_val(stream_pos->packet_real_index,
1863                                                 new_index);
1864                         }
1865                 }
1866         }
1867         return 0;
1868 }
1869
1870 static
1871 void ctf_close_file_stream(struct ctf_file_stream *file_stream)
1872 {
1873         ctf_fini_pos(&file_stream->pos);
1874         close(file_stream->pos.fd);
1875 }
1876
1877 static
1878 void ctf_close_trace(struct trace_descriptor *tdp)
1879 {
1880         struct ctf_trace *td = container_of(tdp, struct ctf_trace, parent);
1881         int i;
1882
1883         if (td->streams) {
1884                 for (i = 0; i < td->streams->len; i++) {
1885                         struct ctf_stream_declaration *stream;
1886                         int j;
1887
1888                         stream = g_ptr_array_index(td->streams, i);
1889                         if (!stream)
1890                                 continue;
1891                         for (j = 0; j < stream->streams->len; j++) {
1892                                 struct ctf_file_stream *file_stream;
1893                                 file_stream = container_of(g_ptr_array_index(stream->streams, j), struct ctf_file_stream, parent);
1894                                 ctf_close_file_stream(file_stream);
1895                         }
1896
1897                 }
1898                 g_ptr_array_free(td->streams, TRUE);
1899         }
1900
1901         if (td->event_declarations) {
1902                 for (i = 0; i < td->event_declarations->len; i++) {
1903                         struct bt_ctf_event_decl *event;
1904
1905                         event = g_ptr_array_index(td->event_declarations, i);
1906                         if (event->context_decl)
1907                                 g_ptr_array_free(event->context_decl, TRUE);
1908                         if (event->fields_decl)
1909                                 g_ptr_array_free(event->fields_decl, TRUE);
1910                         if (event->packet_header_decl)
1911                                 g_ptr_array_free(event->packet_header_decl, TRUE);
1912                         if (event->event_context_decl)
1913                                 g_ptr_array_free(event->event_context_decl, TRUE);
1914                         if (event->event_header_decl)
1915                                 g_ptr_array_free(event->event_header_decl, TRUE);
1916                         if (event->packet_context_decl)
1917                                 g_ptr_array_free(event->packet_context_decl, TRUE);
1918                         g_free(event);
1919                 }
1920                 g_ptr_array_free(td->event_declarations, TRUE);
1921         }
1922         closedir(td->dir);
1923         g_free(td);
1924 }
1925
1926 static
1927 void ctf_set_context(struct trace_descriptor *descriptor,
1928                 struct bt_context *ctx)
1929 {
1930         struct ctf_trace *td = container_of(descriptor, struct ctf_trace,
1931                         parent);
1932
1933         td->ctx = ctx;
1934 }
1935
1936 static
1937 void ctf_set_handle(struct trace_descriptor *descriptor,
1938                 struct bt_trace_handle *handle)
1939 {
1940         struct ctf_trace *td = container_of(descriptor, struct ctf_trace,
1941                         parent);
1942
1943         td->handle = handle;
1944 }
1945
1946 void __attribute__((constructor)) ctf_init(void)
1947 {
1948         int ret;
1949
1950         ctf_format.name = g_quark_from_static_string("ctf");
1951         ret = bt_register_format(&ctf_format);
1952         assert(!ret);
1953 }
1954
1955 /* TODO: finalize */