formats/ctf/ctf.c

   1 /*
   2  * BabelTrace - Common Trace Format (CTF)
   3  *
   4  * Format registration.
   5  *
   6  * Copyright 2010, 2011 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   7  *
   8  * Permission is hereby granted, free of charge, to any person obtaining a copy
   9  * of this software and associated documentation files (the "Software"), to deal
  10  * in the Software without restriction, including without limitation the rights
  11  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  12  * copies of the Software, and to permit persons to whom the Software is
  13  * furnished to do so, subject to the following conditions:
  14  *
  15  * The above copyright notice and this permission notice shall be included in
  16  * all copies or substantial portions of the Software.
  17  */
  18
  19 #include <babeltrace/format.h>
  20 #include <babeltrace/ctf/types.h>
  21 #include <babeltrace/ctf/metadata.h>
  22 #include <babeltrace/babeltrace.h>
  23 #include <inttypes.h>
  24 #include <uuid/uuid.h>
  25 #include <sys/mman.h>
  26 #include <errno.h>
  27 #include <sys/types.h>
  28 #include <sys/stat.h>
  29 #include <fcntl.h>
  30 #include <dirent.h>
  31 #include <glib.h>
  32 #include <unistd.h>
  33 #include <stdlib.h>
  34
  35 #include "metadata/ctf-scanner.h"
  36 #include "metadata/ctf-parser.h"
  37 #include "metadata/ctf-ast.h"
  38
  39 /*
  40  * We currently simply map a page to read the packet header and packet
  41  * context to get the packet length and content length. (in bits)
  42  */
  43 #define MAX_PACKET_HEADER_LEN   (getpagesize() * CHAR_BIT)
  44 #define WRITE_PACKET_LEN        (getpagesize() * 8 * CHAR_BIT)
  45 #define UUID_LEN 16     /* uuid by value len */
  46
  47 extern int yydebug;
  48
  49 struct trace_descriptor *ctf_open_trace(const char *path, int flags);
  50 void ctf_close_trace(struct trace_descriptor *descriptor);
  51
  52 static
  53 rw_dispatch read_dispatch_table[] = {
  54         [ CTF_TYPE_INTEGER ] = ctf_integer_read,
  55         [ CTF_TYPE_FLOAT ] = ctf_float_read,
  56         [ CTF_TYPE_ENUM ] = ctf_enum_read,
  57         [ CTF_TYPE_STRING ] = ctf_string_read,
  58         [ CTF_TYPE_STRUCT ] = ctf_struct_rw,
  59         [ CTF_TYPE_VARIANT ] = ctf_variant_rw,
  60         [ CTF_TYPE_ARRAY ] = ctf_array_rw,
  61         [ CTF_TYPE_SEQUENCE ] = ctf_sequence_rw,
  62 };
  63
  64 static
  65 rw_dispatch write_dispatch_table[] = {
  66         [ CTF_TYPE_INTEGER ] = ctf_integer_write,
  67         [ CTF_TYPE_FLOAT ] = ctf_float_write,
  68         [ CTF_TYPE_ENUM ] = ctf_enum_write,
  69         [ CTF_TYPE_STRING ] = ctf_string_write,
  70         [ CTF_TYPE_STRUCT ] = ctf_struct_rw,
  71         [ CTF_TYPE_VARIANT ] = ctf_variant_rw,
  72         [ CTF_TYPE_ARRAY ] = ctf_array_rw,
  73         [ CTF_TYPE_SEQUENCE ] = ctf_sequence_rw,
  74 };
  75
  76 static
  77 struct format ctf_format = {
  78         .open_trace = ctf_open_trace,
  79         .close_trace = ctf_close_trace,
  80 };
  81
  82 void ctf_init_pos(struct ctf_stream_pos *pos, int fd, int open_flags)
  83 {
  84         pos->fd = fd;
  85         pos->mmap_offset = 0;
  86         pos->packet_size = 0;
  87         pos->content_size = 0;
  88         pos->content_size_loc = NULL;
  89         pos->base = NULL;
  90         pos->offset = 0;
  91         pos->dummy = false;
  92         pos->cur_index = 0;
  93         if (fd >= 0)
  94                 pos->packet_index = g_array_new(FALSE, TRUE,
  95                                                 sizeof(struct packet_index));
  96         else
  97                 pos->packet_index = NULL;
  98         switch (open_flags & O_ACCMODE) {
  99         case O_RDONLY:
 100                 pos->prot = PROT_READ;
 101                 pos->flags = MAP_PRIVATE;
 102                 pos->parent.rw_table = read_dispatch_table;
 103                 break;
 104         case O_WRONLY:
 105         case O_RDWR:
 106                 pos->prot = PROT_WRITE; /* Write has priority */
 107                 pos->flags = MAP_SHARED;
 108                 pos->parent.rw_table = write_dispatch_table;
 109                 if (fd >= 0)
 110                         ctf_move_pos_slow(pos, 0, SEEK_SET);    /* position for write */
 111                 break;
 112         default:
 113                 assert(0);
 114         }
 115 }
 116
 117 void ctf_fini_pos(struct ctf_stream_pos *pos)
 118 {
 119         int ret;
 120
 121         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 122                 *pos->content_size_loc = pos->offset;
 123         if (pos->base) {
 124                 /* unmap old base */
 125                 ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 126                 if (ret) {
 127                         fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 128                                 strerror(errno));
 129                         assert(0);
 130                 }
 131         }
 132         (void) g_array_free(pos->packet_index, TRUE);
 133 }
 134
 135 void ctf_move_pos_slow(struct ctf_stream_pos *pos, size_t offset, int whence)
 136 {
 137         int ret;
 138         off_t off;
 139         struct packet_index *index;
 140
 141         /* Only allow random seek in read mode */
 142         assert(pos->prot != PROT_WRITE || whence == SEEK_CUR);
 143
 144         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 145                 *pos->content_size_loc = pos->offset;
 146
 147         if (pos->base) {
 148                 /* unmap old base */
 149                 ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 150                 if (ret) {
 151                         fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 152                                 strerror(errno));
 153                         assert(0);
 154                 }
 155                 pos->base = NULL;
 156         }
 157
 158         /*
 159          * The caller should never ask for ctf_move_pos across packets,
 160          * except to get exactly at the beginning of the next packet.
 161          */
 162         if (pos->prot == PROT_WRITE) {
 163                 /* The writer will add padding */
 164                 assert(pos->offset + offset == pos->packet_size);
 165
 166                 /*
 167                  * Don't increment for initial stream move (only condition where
 168                  * pos->offset can be 0.
 169                  */
 170                 if (pos->offset)
 171                         pos->mmap_offset += WRITE_PACKET_LEN / CHAR_BIT;
 172                 pos->content_size = -1U;        /* Unknown at this point */
 173                 pos->packet_size = WRITE_PACKET_LEN;
 174                 off = posix_fallocate(pos->fd, pos->mmap_offset, pos->packet_size / CHAR_BIT);
 175                 assert(off >= 0);
 176                 pos->offset = 0;
 177         } else {
 178                 switch (whence) {
 179                 case SEEK_CUR:
 180                         /* The reader will expect us to skip padding */
 181                         assert(pos->offset + offset == pos->content_size);
 182                         ++pos->cur_index;
 183                         break;
 184                 case SEEK_SET:
 185                         assert(offset == 0);    /* only seek supported for now */
 186                         pos->cur_index = 0;
 187                         break;
 188                 default:
 189                         assert(0);
 190                 }
 191                 if (pos->cur_index >= pos->packet_index->len) {
 192                         pos->offset = -EOF;
 193                         return;
 194                 }
 195                 index = &g_array_index(pos->packet_index, struct packet_index,
 196                                        pos->cur_index);
 197                 pos->mmap_offset = index->offset;
 198
 199                 /* Lookup context/packet size in index */
 200                 pos->content_size = index->content_size;
 201                 pos->packet_size = index->packet_size;
 202                 pos->offset = index->data_offset;
 203         }
 204         /* map new base. Need mapping length from header. */
 205         pos->base = mmap(NULL, pos->packet_size / CHAR_BIT, pos->prot,
 206                          pos->flags, pos->fd, pos->mmap_offset);
 207         if (pos->base == MAP_FAILED) {
 208                 fprintf(stdout, "[error] mmap error %s.\n",
 209                         strerror(errno));
 210                 assert(0);
 211         }
 212 }
 213
 214 /*
 215  * TODO: for now, we treat the metadata file as a simple text file
 216  * (without any header nor packets nor padding).
 217  */
 218 static
 219 int ctf_open_trace_metadata_read(struct ctf_trace *td)
 220 {
 221         struct ctf_scanner *scanner;
 222         FILE *fp;
 223         int ret = 0;
 224
 225         td->metadata.pos.fd = openat(td->dirfd, "metadata", O_RDONLY);
 226         if (td->metadata.pos.fd < 0) {
 227                 fprintf(stdout, "Unable to open metadata.\n");
 228                 return td->metadata.pos.fd;
 229         }
 230
 231         if (babeltrace_debug)
 232                 yydebug = 1;
 233
 234         fp = fdopen(td->metadata.pos.fd, "r");
 235         if (!fp) {
 236                 fprintf(stdout, "[error] Unable to open metadata stream.\n");
 237                 ret = -errno;
 238                 goto end_stream;
 239         }
 240
 241         scanner = ctf_scanner_alloc(fp);
 242         if (!scanner) {
 243                 fprintf(stdout, "[error] Error allocating scanner\n");
 244                 ret = -ENOMEM;
 245                 goto end_scanner_alloc;
 246         }
 247         ret = ctf_scanner_append_ast(scanner);
 248         if (ret) {
 249                 fprintf(stdout, "[error] Error creating AST\n");
 250                 goto end;
 251         }
 252
 253         if (babeltrace_debug) {
 254                 ret = ctf_visitor_print_xml(stdout, 0, &scanner->ast->root);
 255                 if (ret) {
 256                         fprintf(stdout, "[error] Error visiting AST for XML output\n");
 257                         goto end;
 258                 }
 259         }
 260
 261         ret = ctf_visitor_semantic_check(stdout, 0, &scanner->ast->root);
 262         if (ret) {
 263                 fprintf(stdout, "[error] Error in CTF semantic validation %d\n", ret);
 264                 goto end;
 265         }
 266         ret = ctf_visitor_construct_metadata(stdout, 0, &scanner->ast->root,
 267                         td, BYTE_ORDER);
 268         if (ret) {
 269                 fprintf(stdout, "[error] Error in CTF metadata constructor %d\n", ret);
 270                 goto end;
 271         }
 272 end:
 273         ctf_scanner_free(scanner);
 274 end_scanner_alloc:
 275         fclose(fp);
 276 end_stream:
 277         close(td->metadata.pos.fd);
 278         return ret;
 279 }
 280
 281
 282 static
 283 int create_stream_packet_index(struct ctf_trace *td,
 284                                struct ctf_file_stream *file_stream)
 285 {
 286         struct ctf_stream *stream;
 287         int len_index;
 288         struct ctf_stream_pos *pos;
 289         struct stat filestats;
 290         struct packet_index packet_index;
 291         int first_packet = 1;
 292         int ret;
 293
 294         pos = &file_stream->pos;
 295
 296         ret = fstat(pos->fd, &filestats);
 297         if (ret < 0)
 298                 return ret;
 299
 300         for (pos->mmap_offset = 0; pos->mmap_offset < filestats.st_size; ) {
 301                 uint64_t stream_id = 0;
 302
 303                 if (pos->base) {
 304                         /* unmap old base */
 305                         ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 306                         if (ret) {
 307                                 fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 308                                         strerror(errno));
 309                                 return ret;
 310                         }
 311                         pos->base = NULL;
 312                 }
 313                 /* map new base. Need mapping length from header. */
 314                 pos->base = mmap(NULL, MAX_PACKET_HEADER_LEN / CHAR_BIT, PROT_READ,
 315                                  MAP_PRIVATE, pos->fd, pos->mmap_offset);
 316                 pos->content_size = MAX_PACKET_HEADER_LEN;      /* Unknown at this point */
 317                 pos->packet_size = MAX_PACKET_HEADER_LEN;       /* Unknown at this point */
 318                 pos->offset = 0;        /* Position of the packet header */
 319
 320                 packet_index.offset = pos->mmap_offset;
 321                 packet_index.content_size = 0;
 322                 packet_index.packet_size = 0;
 323
 324                 /* read and check header, set stream id (and check) */
 325                 if (td->packet_header) {
 326                         /* Read packet header */
 327                         ret = generic_rw(&pos->parent, &td->packet_header->p);
 328                         if (ret)
 329                                 return ret;
 330                         len_index = struct_declaration_lookup_field_index(td->packet_header->declaration, g_quark_from_static_string("magic"));
 331                         if (len_index >= 0) {
 332                                 struct definition_integer *defint;
 333                                 struct field *field;
 334
 335                                 field = struct_definition_get_field_from_index(td->packet_header, len_index);
 336                                 assert(field->definition->declaration->id == CTF_TYPE_INTEGER);
 337                                 defint = container_of(field->definition, struct definition_integer, p);
 338                                 assert(defint->declaration->signedness == FALSE);
 339                                 if (defint->value._unsigned != CTF_MAGIC) {
 340                                         fprintf(stdout, "[error] Invalid magic number %" PRIX64 " at packet %u (file offset %zd).\n",
 341                                                         defint->value._unsigned,
 342                                                         file_stream->pos.packet_index->len,
 343                                                         (ssize_t) pos->mmap_offset);
 344                                         return -EINVAL;
 345                                 }
 346                         }
 347
 348                         /* check uuid */
 349                         len_index = struct_declaration_lookup_field_index(td->packet_header->declaration, g_quark_from_static_string("trace_uuid"));
 350                         if (len_index >= 0) {
 351                                 struct definition_array *defarray;
 352                                 struct field *field;
 353                                 uint64_t i;
 354                                 uint8_t uuidval[UUID_LEN];
 355
 356                                 field = struct_definition_get_field_from_index(td->packet_header, len_index);
 357                                 assert(field->definition->declaration->id == CTF_TYPE_ARRAY);
 358                                 defarray = container_of(field->definition, struct definition_array, p);
 359                                 assert(array_len(defarray) == UUID_LEN);
 360                                 assert(defarray->declaration->elem->id == CTF_TYPE_INTEGER);
 361
 362                                 for (i = 0; i < UUID_LEN; i++) {
 363                                         struct definition *elem;
 364                                         struct definition_integer *defint;
 365
 366                                         elem = array_index(defarray, i);
 367                                         assert(elem);
 368                                         defint = container_of(elem, struct definition_integer, p);
 369                                         uuidval[i] = defint->value._unsigned;
 370                                 }
 371                                 ret = uuid_compare(td->uuid, uuidval);
 372                                 if (ret) {
 373                                         fprintf(stdout, "[error] Unique Universal Identifiers do not match.\n");
 374                                         return -EINVAL;
 375                                 }
 376                         }
 377
 378
 379                         len_index = struct_declaration_lookup_field_index(td->packet_header->declaration, g_quark_from_static_string("stream_id"));
 380                         if (len_index >= 0) {
 381                                 struct definition_integer *defint;
 382                                 struct field *field;
 383
 384                                 field = struct_definition_get_field_from_index(td->packet_header, len_index);
 385                                 assert(field->definition->declaration->id == CTF_TYPE_INTEGER);
 386                                 defint = container_of(field->definition, struct definition_integer, p);
 387                                 assert(defint->declaration->signedness == FALSE);
 388                                 stream_id = defint->value._unsigned;
 389                         }
 390                 }
 391
 392                 if (!first_packet && file_stream->stream_id != stream_id) {
 393                         fprintf(stdout, "[error] Stream ID is changing within a stream.\n");
 394                         return -EINVAL;
 395                 }
 396                 if (first_packet) {
 397                         file_stream->stream_id = stream_id;
 398                         if (stream_id >= td->streams->len) {
 399                                 fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
 400                                 return -EINVAL;
 401                         }
 402                         stream = g_ptr_array_index(td->streams, stream_id);
 403                         if (!stream) {
 404                                 fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
 405                                 return -EINVAL;
 406                         }
 407                         file_stream->stream = stream;
 408                 }
 409                 first_packet = 0;
 410
 411                 if (stream->packet_context) {
 412                         /* Read packet context */
 413                         ret = generic_rw(&pos->parent, &stream->packet_context->p);
 414                         if (ret)
 415                                 return ret;
 416                         /* read content size from header */
 417                         len_index = struct_declaration_lookup_field_index(stream->packet_context->declaration, g_quark_from_static_string("content_size"));
 418                         if (len_index >= 0) {
 419                                 struct definition_integer *defint;
 420                                 struct field *field;
 421
 422                                 field = struct_definition_get_field_from_index(stream->packet_context, len_index);
 423                                 assert(field->definition->declaration->id == CTF_TYPE_INTEGER);
 424                                 defint = container_of(field->definition, struct definition_integer, p);
 425                                 assert(defint->declaration->signedness == FALSE);
 426                                 packet_index.content_size = defint->value._unsigned;
 427                         } else {
 428                                 /* Use file size for packet size */
 429                                 packet_index.content_size = filestats.st_size * CHAR_BIT;
 430                         }
 431
 432                         /* read packet size from header */
 433                         len_index = struct_declaration_lookup_field_index(stream->packet_context->declaration, g_quark_from_static_string("packet_size"));
 434                         if (len_index >= 0) {
 435                                 struct definition_integer *defint;
 436                                 struct field *field;
 437
 438                                 field = struct_definition_get_field_from_index(stream->packet_context, len_index);
 439                                 assert(field->definition->declaration->id == CTF_TYPE_INTEGER);
 440                                 defint = container_of(field->definition, struct definition_integer, p);
 441                                 assert(defint->declaration->signedness == FALSE);
 442                                 packet_index.packet_size = defint->value._unsigned;
 443                         } else {
 444                                 /* Use content size if non-zero, else file size */
 445                                 packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
 446                         }
 447                 } else {
 448                         /* Use file size for packet size */
 449                         packet_index.content_size = filestats.st_size * CHAR_BIT;
 450                         /* Use content size if non-zero, else file size */
 451                         packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
 452                 }
 453
 454                 /* Validate content size and packet size values */
 455                 if (packet_index.content_size > packet_index.packet_size) {
 456                         fprintf(stdout, "[error] Content size (%zu bits) is larger than packet size (%zu bits).\n",
 457                                 packet_index.content_size, packet_index.packet_size);
 458                         return -EINVAL;
 459                 }
 460
 461                 if (packet_index.packet_size > filestats.st_size * CHAR_BIT) {
 462                         fprintf(stdout, "[error] Packet size (%zu bits) is larger than file size (%zu bits).\n",
 463                                 packet_index.content_size, filestats.st_size * CHAR_BIT);
 464                         return -EINVAL;
 465                 }
 466
 467                 /* Save position after header and context */
 468                 packet_index.data_offset = pos->offset;
 469
 470                 /* add index to packet array */
 471                 g_array_append_val(file_stream->pos.packet_index, packet_index);
 472
 473                 pos->mmap_offset += packet_index.packet_size / CHAR_BIT;
 474         }
 475
 476         /* Move pos back to beginning of file */
 477         ctf_move_pos_slow(pos, 0, SEEK_SET);    /* position for write */
 478
 479         return 0;
 480 }
 481
 482 /*
 483  * Note: many file streams can inherit from the same stream class
 484  * description (metadata).
 485  */
 486 static
 487 int ctf_open_file_stream_read(struct ctf_trace *td, const char *path, int flags)
 488 {
 489         int ret;
 490         struct ctf_file_stream *file_stream;
 491
 492         ret = openat(td->dirfd, path, flags);
 493         if (ret < 0)
 494                 goto error;
 495         file_stream = g_new0(struct ctf_file_stream, 1);
 496         ctf_init_pos(&file_stream->pos, ret, flags);
 497         ret = create_stream_packet_index(td, file_stream);
 498         if (ret)
 499                 goto error_index;
 500         /* Add stream file to stream class */
 501         g_ptr_array_add(file_stream->stream->files, file_stream);
 502         return 0;
 503
 504 error_index:
 505         ctf_fini_pos(&file_stream->pos);
 506         close(file_stream->pos.fd);
 507         g_free(file_stream);
 508 error:
 509         return ret;
 510 }
 511
 512 static
 513 int ctf_open_trace_read(struct ctf_trace *td, const char *path, int flags)
 514 {
 515         int ret;
 516         struct dirent *dirent;
 517         struct dirent *diriter;
 518         size_t dirent_len;
 519
 520         td->flags = flags;
 521
 522         /* Open trace directory */
 523         td->dir = opendir(path);
 524         if (!td->dir) {
 525                 fprintf(stdout, "[error] Unable to open trace directory.\n");
 526                 ret = -ENOENT;
 527                 goto error;
 528         }
 529
 530         td->dirfd = open(path, 0);
 531         if (td->dirfd < 0) {
 532                 fprintf(stdout, "[error] Unable to open trace directory file descriptor.\n");
 533                 ret = -ENOENT;
 534                 goto error_dirfd;
 535         }
 536
 537         td->streams = g_ptr_array_new();
 538
 539         /*
 540          * Keep the metadata file separate.
 541          */
 542
 543         ret = ctf_open_trace_metadata_read(td);
 544         if (ret) {
 545                 goto error_metadata;
 546         }
 547
 548         /*
 549          * Open each stream: for each file, try to open, check magic
 550          * number, and get the stream ID to add to the right location in
 551          * the stream array.
 552          */
 553
 554         dirent_len = offsetof(struct dirent, d_name) +
 555                         fpathconf(td->dirfd, _PC_NAME_MAX) + 1;
 556
 557         dirent = malloc(dirent_len);
 558
 559         for (;;) {
 560                 ret = readdir_r(td->dir, dirent, &diriter);
 561                 if (ret) {
 562                         fprintf(stdout, "[error] Readdir error.\n");
 563                         goto readdir_error;
 564                 }
 565                 if (!diriter)
 566                         break;
 567                 if (!strcmp(diriter->d_name, ".")
 568                                 || !strcmp(diriter->d_name, "..")
 569                                 || !strcmp(diriter->d_name, "metadata"))
 570                         continue;
 571                 ret = ctf_open_file_stream_read(td, diriter->d_name, flags);
 572                 if (ret) {
 573                         fprintf(stdout, "[error] Open file stream error.\n");
 574                         goto readdir_error;
 575                 }
 576         }
 577
 578         free(dirent);
 579         return 0;
 580
 581 readdir_error:
 582         free(dirent);
 583 error_metadata:
 584         g_ptr_array_free(td->streams, TRUE);
 585         close(td->dirfd);
 586 error_dirfd:
 587         closedir(td->dir);
 588 error:
 589         return ret;
 590 }
 591
 592 struct trace_descriptor *ctf_open_trace(const char *path, int flags)
 593 {
 594         struct ctf_trace *td;
 595         int ret;
 596
 597         td = g_new0(struct ctf_trace, 1);
 598
 599         switch (flags & O_ACCMODE) {
 600         case O_RDONLY:
 601                 if (!path) {
 602                         fprintf(stdout, "[error] Path missing for input CTF trace.\n");
 603                         goto error;
 604                 }
 605                 ret = ctf_open_trace_read(td, path, flags);
 606                 if (ret)
 607                         goto error;
 608                 break;
 609         case O_WRONLY:
 610                 fprintf(stdout, "[error] Opening CTF traces for output is not supported yet.\n");
 611                 goto error;
 612         default:
 613                 fprintf(stdout, "[error] Incorrect open flags.\n");
 614                 goto error;
 615         }
 616
 617         return &td->parent;
 618 error:
 619         g_free(td);
 620         return NULL;
 621 }
 622
 623 static
 624 void ctf_close_file_stream(struct ctf_file_stream *file_stream)
 625 {
 626         ctf_fini_pos(&file_stream->pos);
 627         close(file_stream->pos.fd);
 628 }
 629
 630 void ctf_close_trace(struct trace_descriptor *tdp)
 631 {
 632         struct ctf_trace *td = container_of(tdp, struct ctf_trace, parent);
 633         int i;
 634
 635         if (td->streams) {
 636                 for (i = 0; i < td->streams->len; i++) {
 637                         struct ctf_stream *stream;
 638                         int j;
 639                         stream = g_ptr_array_index(td->streams, i);
 640                         for (j = 0; j < stream->files->len; j++) {
 641                                 struct ctf_file_stream *file_stream;
 642                                 file_stream = g_ptr_array_index(stream->files, j);
 643                                 ctf_close_file_stream(file_stream);
 644                         }
 645
 646                 }
 647                 g_ptr_array_free(td->streams, TRUE);
 648         }
 649         closedir(td->dir);
 650         g_free(td);
 651 }
 652
 653 void __attribute__((constructor)) ctf_init(void)
 654 {
 655         int ret;
 656
 657         ctf_format.name = g_quark_from_static_string("ctf");
 658         ret = bt_register_format(&ctf_format);
 659         assert(!ret);
 660 }
 661
 662 /* TODO: finalize */