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_RDWR:
 105                 pos->prot = PROT_WRITE; /* Write has priority */
 106                 pos->flags = MAP_SHARED;
 107                 pos->parent.rw_table = write_dispatch_table;
 108                 if (fd >= 0)
 109                         ctf_move_pos_slow(pos, 0, SEEK_SET);    /* position for write */
 110                 break;
 111         default:
 112                 assert(0);
 113         }
 114 }
 115
 116 void ctf_fini_pos(struct ctf_stream_pos *pos)
 117 {
 118         int ret;
 119
 120         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 121                 *pos->content_size_loc = pos->offset;
 122         if (pos->base) {
 123                 /* unmap old base */
 124                 ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 125                 if (ret) {
 126                         fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 127                                 strerror(errno));
 128                         assert(0);
 129                 }
 130         }
 131         (void) g_array_free(pos->packet_index, TRUE);
 132 }
 133
 134 void ctf_move_pos_slow(struct ctf_stream_pos *pos, size_t offset, int whence)
 135 {
 136         int ret;
 137         off_t off;
 138         struct packet_index *index;
 139
 140         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 141                 *pos->content_size_loc = pos->offset;
 142
 143         if (pos->base) {
 144                 /* unmap old base */
 145                 ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 146                 if (ret) {
 147                         fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 148                                 strerror(errno));
 149                         assert(0);
 150                 }
 151                 pos->base = NULL;
 152         }
 153
 154         /*
 155          * The caller should never ask for ctf_move_pos across packets,
 156          * except to get exactly at the beginning of the next packet.
 157          */
 158         if (pos->prot == PROT_WRITE) {
 159                 switch (whence) {
 160                 case SEEK_CUR:
 161                         /* The writer will add padding */
 162                         assert(pos->offset + offset == pos->packet_size);
 163                         pos->mmap_offset += WRITE_PACKET_LEN / CHAR_BIT;
 164                         break;
 165                 case SEEK_SET:
 166                         assert(offset == 0);    /* only seek supported for now */
 167                         pos->cur_index = 0;
 168                         break;
 169                 default:
 170                         assert(0);
 171                 }
 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,
 175                                       pos->packet_size / CHAR_BIT);
 176                 assert(off >= 0);
 177                 pos->offset = 0;
 178         } else {
 179                 switch (whence) {
 180                 case SEEK_CUR:
 181                         /* The reader will expect us to skip padding */
 182                         assert(pos->offset + offset == pos->content_size);
 183                         ++pos->cur_index;
 184                         break;
 185                 case SEEK_SET:
 186                         assert(offset == 0);    /* only seek supported for now */
 187                         pos->cur_index = 0;
 188                         break;
 189                 default:
 190                         assert(0);
 191                 }
 192                 if (pos->cur_index >= pos->packet_index->len) {
 193                         pos->offset = EOF;
 194                         return;
 195                 }
 196                 index = &g_array_index(pos->packet_index, struct packet_index,
 197                                        pos->cur_index);
 198                 pos->mmap_offset = index->offset;
 199
 200                 /* Lookup context/packet size in index */
 201                 pos->content_size = index->content_size;
 202                 pos->packet_size = index->packet_size;
 203                 pos->offset = index->data_offset;
 204         }
 205         /* map new base. Need mapping length from header. */
 206         pos->base = mmap(NULL, pos->packet_size / CHAR_BIT, pos->prot,
 207                          pos->flags, pos->fd, pos->mmap_offset);
 208         if (pos->base == MAP_FAILED) {
 209                 fprintf(stdout, "[error] mmap error %s.\n",
 210                         strerror(errno));
 211                 assert(0);
 212         }
 213 }
 214
 215 /*
 216  * TODO: for now, we treat the metadata file as a simple text file
 217  * (without any header nor packets nor padding).
 218  */
 219 static
 220 int ctf_open_trace_metadata_read(struct ctf_trace *td)
 221 {
 222         struct ctf_scanner *scanner;
 223         FILE *fp;
 224         int ret = 0;
 225
 226         td->metadata.pos.fd = openat(td->dirfd, "metadata", O_RDONLY);
 227         if (td->metadata.pos.fd < 0) {
 228                 fprintf(stdout, "Unable to open metadata.\n");
 229                 return td->metadata.pos.fd;
 230         }
 231
 232         if (babeltrace_debug)
 233                 yydebug = 1;
 234
 235         fp = fdopen(td->metadata.pos.fd, "r");
 236         if (!fp) {
 237                 fprintf(stdout, "[error] Unable to open metadata stream.\n");
 238                 ret = -errno;
 239                 goto end_stream;
 240         }
 241
 242         scanner = ctf_scanner_alloc(fp);
 243         if (!scanner) {
 244                 fprintf(stdout, "[error] Error allocating scanner\n");
 245                 ret = -ENOMEM;
 246                 goto end_scanner_alloc;
 247         }
 248         ret = ctf_scanner_append_ast(scanner);
 249         if (ret) {
 250                 fprintf(stdout, "[error] Error creating AST\n");
 251                 goto end;
 252         }
 253
 254         if (babeltrace_debug) {
 255                 ret = ctf_visitor_print_xml(stdout, 0, &scanner->ast->root);
 256                 if (ret) {
 257                         fprintf(stdout, "[error] Error visiting AST for XML output\n");
 258                         goto end;
 259                 }
 260         }
 261
 262         ret = ctf_visitor_semantic_check(stdout, 0, &scanner->ast->root);
 263         if (ret) {
 264                 fprintf(stdout, "[error] Error in CTF semantic validation %d\n", ret);
 265                 goto end;
 266         }
 267         ret = ctf_visitor_construct_metadata(stdout, 0, &scanner->ast->root,
 268                         td, BYTE_ORDER);
 269         if (ret) {
 270                 fprintf(stdout, "[error] Error in CTF metadata constructor %d\n", ret);
 271                 goto end;
 272         }
 273 end:
 274         ctf_scanner_free(scanner);
 275 end_scanner_alloc:
 276         fclose(fp);
 277 end_stream:
 278         close(td->metadata.pos.fd);
 279         return ret;
 280 }
 281
 282
 283 static
 284 int create_stream_packet_index(struct ctf_trace *td,
 285                                struct ctf_file_stream *file_stream)
 286 {
 287         struct ctf_stream *stream;
 288         int len_index;
 289         struct ctf_stream_pos *pos;
 290         struct stat filestats;
 291         struct packet_index packet_index;
 292         int first_packet = 1;
 293         int ret;
 294
 295         pos = &file_stream->pos;
 296
 297         ret = fstat(pos->fd, &filestats);
 298         if (ret < 0)
 299                 return ret;
 300
 301         for (pos->mmap_offset = 0; pos->mmap_offset < filestats.st_size; ) {
 302                 uint64_t stream_id = 0;
 303
 304                 if (pos->base) {
 305                         /* unmap old base */
 306                         ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 307                         if (ret) {
 308                                 fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 309                                         strerror(errno));
 310                                 return ret;
 311                         }
 312                         pos->base = NULL;
 313                 }
 314                 /* map new base. Need mapping length from header. */
 315                 pos->base = mmap(NULL, MAX_PACKET_HEADER_LEN / CHAR_BIT, PROT_READ,
 316                                  MAP_PRIVATE, pos->fd, pos->mmap_offset);
 317                 pos->content_size = MAX_PACKET_HEADER_LEN;      /* Unknown at this point */
 318                 pos->packet_size = MAX_PACKET_HEADER_LEN;       /* Unknown at this point */
 319                 pos->offset = 0;        /* Position of the packet header */
 320
 321                 packet_index.offset = pos->mmap_offset;
 322                 packet_index.content_size = 0;
 323                 packet_index.packet_size = 0;
 324
 325                 /* read and check header, set stream id (and check) */
 326                 if (td->packet_header) {
 327                         /* Read packet header */
 328                         ret = generic_rw(&pos->parent, &td->packet_header->p);
 329                         if (ret)
 330                                 return ret;
 331                         len_index = struct_declaration_lookup_field_index(td->packet_header->declaration, g_quark_from_static_string("magic"));
 332                         if (len_index >= 0) {
 333                                 struct definition_integer *defint;
 334                                 struct field *field;
 335
 336                                 field = struct_definition_get_field_from_index(td->packet_header, len_index);
 337                                 assert(field->definition->declaration->id == CTF_TYPE_INTEGER);
 338                                 defint = container_of(field->definition, struct definition_integer, p);
 339                                 assert(defint->declaration->signedness == FALSE);
 340                                 if (defint->value._unsigned != CTF_MAGIC) {
 341                                         fprintf(stdout, "[error] Invalid magic number 0x%" PRIX64 " at packet %u (file offset %zd).\n",
 342                                                         defint->value._unsigned,
 343                                                         file_stream->pos.packet_index->len,
 344                                                         (ssize_t) pos->mmap_offset);
 345                                         return -EINVAL;
 346                                 }
 347                         }
 348
 349                         /* check uuid */
 350                         len_index = struct_declaration_lookup_field_index(td->packet_header->declaration, g_quark_from_static_string("trace_uuid"));
 351                         if (len_index >= 0) {
 352                                 struct definition_array *defarray;
 353                                 struct field *field;
 354                                 uint64_t i;
 355                                 uint8_t uuidval[UUID_LEN];
 356
 357                                 field = struct_definition_get_field_from_index(td->packet_header, len_index);
 358                                 assert(field->definition->declaration->id == CTF_TYPE_ARRAY);
 359                                 defarray = container_of(field->definition, struct definition_array, p);
 360                                 assert(array_len(defarray) == UUID_LEN);
 361                                 assert(defarray->declaration->elem->id == CTF_TYPE_INTEGER);
 362
 363                                 for (i = 0; i < UUID_LEN; i++) {
 364                                         struct definition *elem;
 365                                         struct definition_integer *defint;
 366
 367                                         elem = array_index(defarray, i);
 368                                         assert(elem);
 369                                         defint = container_of(elem, struct definition_integer, p);
 370                                         uuidval[i] = defint->value._unsigned;
 371                                 }
 372                                 ret = uuid_compare(td->uuid, uuidval);
 373                                 if (ret) {
 374                                         fprintf(stdout, "[error] Unique Universal Identifiers do not match.\n");
 375                                         return -EINVAL;
 376                                 }
 377                         }
 378
 379
 380                         len_index = struct_declaration_lookup_field_index(td->packet_header->declaration, g_quark_from_static_string("stream_id"));
 381                         if (len_index >= 0) {
 382                                 struct definition_integer *defint;
 383                                 struct field *field;
 384
 385                                 field = struct_definition_get_field_from_index(td->packet_header, len_index);
 386                                 assert(field->definition->declaration->id == CTF_TYPE_INTEGER);
 387                                 defint = container_of(field->definition, struct definition_integer, p);
 388                                 assert(defint->declaration->signedness == FALSE);
 389                                 stream_id = defint->value._unsigned;
 390                         }
 391                 }
 392
 393                 if (!first_packet && file_stream->stream_id != stream_id) {
 394                         fprintf(stdout, "[error] Stream ID is changing within a stream.\n");
 395                         return -EINVAL;
 396                 }
 397                 if (first_packet) {
 398                         file_stream->stream_id = stream_id;
 399                         if (stream_id >= td->streams->len) {
 400                                 fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
 401                                 return -EINVAL;
 402                         }
 403                         stream = g_ptr_array_index(td->streams, stream_id);
 404                         if (!stream) {
 405                                 fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
 406                                 return -EINVAL;
 407                         }
 408                         file_stream->stream = stream;
 409                 }
 410                 first_packet = 0;
 411
 412                 if (stream->packet_context) {
 413                         /* Read packet context */
 414                         ret = generic_rw(&pos->parent, &stream->packet_context->p);
 415                         if (ret)
 416                                 return ret;
 417                         /* read content size from header */
 418                         len_index = struct_declaration_lookup_field_index(stream->packet_context->declaration, g_quark_from_static_string("content_size"));
 419                         if (len_index >= 0) {
 420                                 struct definition_integer *defint;
 421                                 struct field *field;
 422
 423                                 field = struct_definition_get_field_from_index(stream->packet_context, len_index);
 424                                 assert(field->definition->declaration->id == CTF_TYPE_INTEGER);
 425                                 defint = container_of(field->definition, struct definition_integer, p);
 426                                 assert(defint->declaration->signedness == FALSE);
 427                                 packet_index.content_size = defint->value._unsigned;
 428                         } else {
 429                                 /* Use file size for packet size */
 430                                 packet_index.content_size = filestats.st_size * CHAR_BIT;
 431                         }
 432
 433                         /* read packet size from header */
 434                         len_index = struct_declaration_lookup_field_index(stream->packet_context->declaration, g_quark_from_static_string("packet_size"));
 435                         if (len_index >= 0) {
 436                                 struct definition_integer *defint;
 437                                 struct field *field;
 438
 439                                 field = struct_definition_get_field_from_index(stream->packet_context, len_index);
 440                                 assert(field->definition->declaration->id == CTF_TYPE_INTEGER);
 441                                 defint = container_of(field->definition, struct definition_integer, p);
 442                                 assert(defint->declaration->signedness == FALSE);
 443                                 packet_index.packet_size = defint->value._unsigned;
 444                         } else {
 445                                 /* Use content size if non-zero, else file size */
 446                                 packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
 447                         }
 448                 } else {
 449                         /* Use file size for packet size */
 450                         packet_index.content_size = filestats.st_size * CHAR_BIT;
 451                         /* Use content size if non-zero, else file size */
 452                         packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
 453                 }
 454
 455                 /* Validate content size and packet size values */
 456                 if (packet_index.content_size > packet_index.packet_size) {
 457                         fprintf(stdout, "[error] Content size (%zu bits) is larger than packet size (%zu bits).\n",
 458                                 packet_index.content_size, packet_index.packet_size);
 459                         return -EINVAL;
 460                 }
 461
 462                 if (packet_index.packet_size > (filestats.st_size - packet_index.offset) * CHAR_BIT) {
 463                         fprintf(stdout, "[error] Packet size (%zu bits) is larger than remaining file size (%zu bits).\n",
 464                                 packet_index.content_size, (filestats.st_size - packet_index.offset) * CHAR_BIT);
 465                         return -EINVAL;
 466                 }
 467
 468                 /* Save position after header and context */
 469                 packet_index.data_offset = pos->offset;
 470
 471                 /* add index to packet array */
 472                 g_array_append_val(file_stream->pos.packet_index, packet_index);
 473
 474                 pos->mmap_offset += packet_index.packet_size / CHAR_BIT;
 475         }
 476
 477         /* Move pos back to beginning of file */
 478         ctf_move_pos_slow(pos, 0, SEEK_SET);    /* position for write */
 479
 480         return 0;
 481 }
 482
 483 /*
 484  * Note: many file streams can inherit from the same stream class
 485  * description (metadata).
 486  */
 487 static
 488 int ctf_open_file_stream_read(struct ctf_trace *td, const char *path, int flags)
 489 {
 490         int ret;
 491         struct ctf_file_stream *file_stream;
 492
 493         ret = openat(td->dirfd, path, flags);
 494         if (ret < 0)
 495                 goto error;
 496         file_stream = g_new0(struct ctf_file_stream, 1);
 497         ctf_init_pos(&file_stream->pos, ret, flags);
 498         ret = create_stream_packet_index(td, file_stream);
 499         if (ret)
 500                 goto error_index;
 501         /* Add stream file to stream class */
 502         g_ptr_array_add(file_stream->stream->files, file_stream);
 503         return 0;
 504
 505 error_index:
 506         ctf_fini_pos(&file_stream->pos);
 507         close(file_stream->pos.fd);
 508         g_free(file_stream);
 509 error:
 510         return ret;
 511 }
 512
 513 static
 514 int ctf_open_trace_read(struct ctf_trace *td, const char *path, int flags)
 515 {
 516         int ret;
 517         struct dirent *dirent;
 518         struct dirent *diriter;
 519         size_t dirent_len;
 520
 521         td->flags = flags;
 522
 523         /* Open trace directory */
 524         td->dir = opendir(path);
 525         if (!td->dir) {
 526                 fprintf(stdout, "[error] Unable to open trace directory.\n");
 527                 ret = -ENOENT;
 528                 goto error;
 529         }
 530
 531         td->dirfd = open(path, 0);
 532         if (td->dirfd < 0) {
 533                 fprintf(stdout, "[error] Unable to open trace directory file descriptor.\n");
 534                 ret = -ENOENT;
 535                 goto error_dirfd;
 536         }
 537
 538         td->streams = g_ptr_array_new();
 539
 540         /*
 541          * Keep the metadata file separate.
 542          */
 543
 544         ret = ctf_open_trace_metadata_read(td);
 545         if (ret) {
 546                 goto error_metadata;
 547         }
 548
 549         /*
 550          * Open each stream: for each file, try to open, check magic
 551          * number, and get the stream ID to add to the right location in
 552          * the stream array.
 553          */
 554
 555         dirent_len = offsetof(struct dirent, d_name) +
 556                         fpathconf(td->dirfd, _PC_NAME_MAX) + 1;
 557
 558         dirent = malloc(dirent_len);
 559
 560         for (;;) {
 561                 ret = readdir_r(td->dir, dirent, &diriter);
 562                 if (ret) {
 563                         fprintf(stdout, "[error] Readdir error.\n");
 564                         goto readdir_error;
 565                 }
 566                 if (!diriter)
 567                         break;
 568                 /* Ignore hidden files, ., .. and metadata. */
 569                 if (!strncmp(diriter->d_name, ".", 1)
 570                                 || !strcmp(diriter->d_name, "..")
 571                                 || !strcmp(diriter->d_name, "metadata"))
 572                         continue;
 573                 ret = ctf_open_file_stream_read(td, diriter->d_name, flags);
 574                 if (ret) {
 575                         fprintf(stdout, "[error] Open file stream error.\n");
 576                         goto readdir_error;
 577                 }
 578         }
 579
 580         free(dirent);
 581         return 0;
 582
 583 readdir_error:
 584         free(dirent);
 585 error_metadata:
 586         g_ptr_array_free(td->streams, TRUE);
 587         close(td->dirfd);
 588 error_dirfd:
 589         closedir(td->dir);
 590 error:
 591         return ret;
 592 }
 593
 594 struct trace_descriptor *ctf_open_trace(const char *path, int flags)
 595 {
 596         struct ctf_trace *td;
 597         int ret;
 598
 599         td = g_new0(struct ctf_trace, 1);
 600
 601         switch (flags & O_ACCMODE) {
 602         case O_RDONLY:
 603                 if (!path) {
 604                         fprintf(stdout, "[error] Path missing for input CTF trace.\n");
 605                         goto error;
 606                 }
 607                 ret = ctf_open_trace_read(td, path, flags);
 608                 if (ret)
 609                         goto error;
 610                 break;
 611         case O_RDWR:
 612                 fprintf(stdout, "[error] Opening CTF traces for output is not supported yet.\n");
 613                 goto error;
 614         default:
 615                 fprintf(stdout, "[error] Incorrect open flags.\n");
 616                 goto error;
 617         }
 618
 619         return &td->parent;
 620 error:
 621         g_free(td);
 622         return NULL;
 623 }
 624
 625 static
 626 void ctf_close_file_stream(struct ctf_file_stream *file_stream)
 627 {
 628         ctf_fini_pos(&file_stream->pos);
 629         close(file_stream->pos.fd);
 630 }
 631
 632 void ctf_close_trace(struct trace_descriptor *tdp)
 633 {
 634         struct ctf_trace *td = container_of(tdp, struct ctf_trace, parent);
 635         int i;
 636
 637         if (td->streams) {
 638                 for (i = 0; i < td->streams->len; i++) {
 639                         struct ctf_stream *stream;
 640                         int j;
 641                         stream = g_ptr_array_index(td->streams, i);
 642                         for (j = 0; j < stream->files->len; j++) {
 643                                 struct ctf_file_stream *file_stream;
 644                                 file_stream = g_ptr_array_index(stream->files, j);
 645                                 ctf_close_file_stream(file_stream);
 646                         }
 647
 648                 }
 649                 g_ptr_array_free(td->streams, TRUE);
 650         }
 651         closedir(td->dir);
 652         g_free(td);
 653 }
 654
 655 void __attribute__((constructor)) ctf_init(void)
 656 {
 657         int ret;
 658
 659         ctf_format.name = g_quark_from_static_string("ctf");
 660         ret = bt_register_format(&ctf_format);
 661         assert(!ret);
 662 }
 663
 664 /* TODO: finalize */