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 <stdio.h>
  25 #include <uuid/uuid.h>
  26 #include <sys/mman.h>
  27 #include <errno.h>
  28 #include <endian.h>
  29 #include <sys/types.h>
  30 #include <sys/stat.h>
  31 #include <fcntl.h>
  32 #include <dirent.h>
  33 #include <glib.h>
  34 #include <unistd.h>
  35 #include <stdlib.h>
  36
  37 #include "metadata/ctf-scanner.h"
  38 #include "metadata/ctf-parser.h"
  39 #include "metadata/ctf-ast.h"
  40
  41 /*
  42  * We currently simply map a page to read the packet header and packet
  43  * context to get the packet length and content length. (in bits)
  44  */
  45 #define MAX_PACKET_HEADER_LEN   (getpagesize() * CHAR_BIT)
  46 #define WRITE_PACKET_LEN        (getpagesize() * 8 * CHAR_BIT)
  47 #define UUID_LEN 16     /* uuid by value len */
  48
  49 #ifndef min
  50 #define min(a, b)       (((a) < (b)) ? (a) : (b))
  51 #endif
  52
  53 extern int yydebug;
  54
  55 struct trace_descriptor *ctf_open_trace(const char *path, int flags);
  56 void ctf_close_trace(struct trace_descriptor *descriptor);
  57
  58 static
  59 rw_dispatch read_dispatch_table[] = {
  60         [ CTF_TYPE_INTEGER ] = ctf_integer_read,
  61         [ CTF_TYPE_FLOAT ] = ctf_float_read,
  62         [ CTF_TYPE_ENUM ] = ctf_enum_read,
  63         [ CTF_TYPE_STRING ] = ctf_string_read,
  64         [ CTF_TYPE_STRUCT ] = ctf_struct_rw,
  65         [ CTF_TYPE_VARIANT ] = ctf_variant_rw,
  66         [ CTF_TYPE_ARRAY ] = ctf_array_read,
  67         [ CTF_TYPE_SEQUENCE ] = ctf_sequence_read,
  68 };
  69
  70 static
  71 rw_dispatch write_dispatch_table[] = {
  72         [ CTF_TYPE_INTEGER ] = ctf_integer_write,
  73         [ CTF_TYPE_FLOAT ] = ctf_float_write,
  74         [ CTF_TYPE_ENUM ] = ctf_enum_write,
  75         [ CTF_TYPE_STRING ] = ctf_string_write,
  76         [ CTF_TYPE_STRUCT ] = ctf_struct_rw,
  77         [ CTF_TYPE_VARIANT ] = ctf_variant_rw,
  78         [ CTF_TYPE_ARRAY ] = ctf_array_write,
  79         [ CTF_TYPE_SEQUENCE ] = ctf_sequence_write,
  80 };
  81
  82 static
  83 struct format ctf_format = {
  84         .open_trace = ctf_open_trace,
  85         .close_trace = ctf_close_trace,
  86 };
  87
  88 static
  89 int ctf_read_event(struct stream_pos *ppos, struct ctf_stream *stream)
  90 {
  91         struct ctf_stream_pos *pos =
  92                 container_of(ppos, struct ctf_stream_pos, parent);
  93         struct ctf_stream_class *stream_class = stream->stream_class;
  94         struct ctf_event *event_class;
  95         uint64_t id = 0;
  96         int len_index;
  97         int ret;
  98
  99         if (pos->offset == EOF)
 100                 return EOF;
 101
 102         /* Read event header */
 103         if (stream_class->event_header) {
 104                 ret = generic_rw(ppos, &stream_class->event_header->p);
 105                 if (ret)
 106                         goto error;
 107                 /* lookup event id */
 108                 len_index = struct_declaration_lookup_field_index(stream_class->event_header_decl,
 109                                 g_quark_from_static_string("id"));
 110                 if (len_index >= 0) {
 111                         struct definition_integer *defint;
 112                         struct definition *field;
 113
 114                         field = struct_definition_get_field_from_index(stream_class->event_header, len_index);
 115                         assert(field->declaration->id == CTF_TYPE_INTEGER);
 116                         defint = container_of(field, struct definition_integer, p);
 117                         assert(defint->declaration->signedness == FALSE);
 118                         id = defint->value._unsigned;   /* set id */
 119                 }
 120
 121                 /* lookup timestamp */
 122                 len_index = struct_declaration_lookup_field_index(stream_class->event_header_decl,
 123                                 g_quark_from_static_string("timestamp"));
 124                 if (len_index >= 0) {
 125                         struct definition_integer *defint;
 126                         struct definition *field;
 127
 128                         field = struct_definition_get_field_from_index(stream_class->event_header, len_index);
 129                         assert(field->declaration->id == CTF_TYPE_INTEGER);
 130                         defint = container_of(field, struct definition_integer, p);
 131                         assert(defint->declaration->signedness == FALSE);
 132                         /* update timestamp */
 133                         stream->timestamp = defint->value._unsigned;
 134                 }
 135
 136         }
 137
 138         /* Read stream-declared event context */
 139         if (stream_class->event_context) {
 140                 ret = generic_rw(ppos, &stream_class->event_context->p);
 141                 if (ret)
 142                         goto error;
 143         }
 144
 145         if (id >= stream_class->events_by_id->len) {
 146                 fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
 147                 return -EINVAL;
 148         }
 149         event_class = g_ptr_array_index(stream_class->events_by_id, id);
 150         if (!event_class) {
 151                 fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
 152                 return -EINVAL;
 153         }
 154
 155         /* Read event-declared event context */
 156         if (event_class->context) {
 157                 ret = generic_rw(ppos, &event_class->context->p);
 158                 if (ret)
 159                         goto error;
 160         }
 161
 162         /* Read event payload */
 163         if (event_class->fields) {
 164                 ret = generic_rw(ppos, &event_class->fields->p);
 165                 if (ret)
 166                         goto error;
 167         }
 168
 169         return 0;
 170
 171 error:
 172         fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
 173         return ret;
 174 }
 175
 176 static
 177 int ctf_write_event(struct stream_pos *pos, struct ctf_stream *stream)
 178 {
 179         struct ctf_stream_class *stream_class = stream->stream_class;
 180         struct ctf_event *event_class;
 181         uint64_t id = 0;
 182         int len_index;
 183         int ret;
 184
 185         /* print event header */
 186         if (stream_class->event_header) {
 187                 /* lookup event id */
 188                 len_index = struct_declaration_lookup_field_index(stream_class->event_header_decl,
 189                                 g_quark_from_static_string("id"));
 190                 if (len_index >= 0) {
 191                         struct definition_integer *defint;
 192                         struct definition *field;
 193
 194                         field = struct_definition_get_field_from_index(stream_class->event_header, len_index);
 195                         assert(field->declaration->id == CTF_TYPE_INTEGER);
 196                         defint = container_of(field, struct definition_integer, p);
 197                         assert(defint->declaration->signedness == FALSE);
 198                         id = defint->value._unsigned;   /* set id */
 199                 }
 200
 201                 ret = generic_rw(pos, &stream_class->event_header->p);
 202                 if (ret)
 203                         goto error;
 204         }
 205
 206         /* print stream-declared event context */
 207         if (stream_class->event_context) {
 208                 ret = generic_rw(pos, &stream_class->event_context->p);
 209                 if (ret)
 210                         goto error;
 211         }
 212
 213         if (id >= stream_class->events_by_id->len) {
 214                 fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
 215                 return -EINVAL;
 216         }
 217         event_class = g_ptr_array_index(stream_class->events_by_id, id);
 218         if (!event_class) {
 219                 fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
 220                 return -EINVAL;
 221         }
 222
 223         /* print event-declared event context */
 224         if (event_class->context) {
 225                 ret = generic_rw(pos, &event_class->context->p);
 226                 if (ret)
 227                         goto error;
 228         }
 229
 230         /* Read and print event payload */
 231         if (event_class->fields) {
 232                 ret = generic_rw(pos, &event_class->fields->p);
 233                 if (ret)
 234                         goto error;
 235         }
 236
 237         return 0;
 238
 239 error:
 240         fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
 241         return ret;
 242 }
 243
 244 void ctf_init_pos(struct ctf_stream_pos *pos, int fd, int open_flags)
 245 {
 246         pos->fd = fd;
 247         pos->mmap_offset = 0;
 248         pos->packet_size = 0;
 249         pos->content_size = 0;
 250         pos->content_size_loc = NULL;
 251         pos->base = NULL;
 252         pos->offset = 0;
 253         pos->dummy = false;
 254         pos->cur_index = 0;
 255         if (fd >= 0)
 256                 pos->packet_index = g_array_new(FALSE, TRUE,
 257                                                 sizeof(struct packet_index));
 258         else
 259                 pos->packet_index = NULL;
 260         switch (open_flags & O_ACCMODE) {
 261         case O_RDONLY:
 262                 pos->prot = PROT_READ;
 263                 pos->flags = MAP_PRIVATE;
 264                 pos->parent.rw_table = read_dispatch_table;
 265                 pos->parent.event_cb = ctf_read_event;
 266                 break;
 267         case O_RDWR:
 268                 pos->prot = PROT_WRITE; /* Write has priority */
 269                 pos->flags = MAP_SHARED;
 270                 pos->parent.rw_table = write_dispatch_table;
 271                 pos->parent.event_cb = ctf_write_event;
 272                 if (fd >= 0)
 273                         ctf_move_pos_slow(pos, 0, SEEK_SET);    /* position for write */
 274                 break;
 275         default:
 276                 assert(0);
 277         }
 278 }
 279
 280 void ctf_fini_pos(struct ctf_stream_pos *pos)
 281 {
 282         int ret;
 283
 284         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 285                 *pos->content_size_loc = pos->offset;
 286         if (pos->base) {
 287                 /* unmap old base */
 288                 ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 289                 if (ret) {
 290                         fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 291                                 strerror(errno));
 292                         assert(0);
 293                 }
 294         }
 295         (void) g_array_free(pos->packet_index, TRUE);
 296 }
 297
 298 void ctf_move_pos_slow(struct ctf_stream_pos *pos, size_t offset, int whence)
 299 {
 300         int ret;
 301         off_t off;
 302         struct packet_index *index;
 303
 304         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 305                 *pos->content_size_loc = pos->offset;
 306
 307         if (pos->base) {
 308                 /* unmap old base */
 309                 ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 310                 if (ret) {
 311                         fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 312                                 strerror(errno));
 313                         assert(0);
 314                 }
 315                 pos->base = NULL;
 316         }
 317
 318         /*
 319          * The caller should never ask for ctf_move_pos across packets,
 320          * except to get exactly at the beginning of the next packet.
 321          */
 322         if (pos->prot == PROT_WRITE) {
 323                 switch (whence) {
 324                 case SEEK_CUR:
 325                         /* The writer will add padding */
 326                         assert(pos->offset + offset == pos->packet_size);
 327                         pos->mmap_offset += WRITE_PACKET_LEN / CHAR_BIT;
 328                         break;
 329                 case SEEK_SET:
 330                         assert(offset == 0);    /* only seek supported for now */
 331                         pos->cur_index = 0;
 332                         break;
 333                 default:
 334                         assert(0);
 335                 }
 336                 pos->content_size = -1U;        /* Unknown at this point */
 337                 pos->packet_size = WRITE_PACKET_LEN;
 338                 off = posix_fallocate(pos->fd, pos->mmap_offset,
 339                                       pos->packet_size / CHAR_BIT);
 340                 assert(off >= 0);
 341                 pos->offset = 0;
 342         } else {
 343                 switch (whence) {
 344                 case SEEK_CUR:
 345                         /* The reader will expect us to skip padding */
 346                         assert(pos->offset + offset == pos->content_size);
 347                         ++pos->cur_index;
 348                         break;
 349                 case SEEK_SET:
 350                         assert(offset == 0);    /* only seek supported for now */
 351                         pos->cur_index = 0;
 352                         break;
 353                 default:
 354                         assert(0);
 355                 }
 356                 if (pos->cur_index >= pos->packet_index->len) {
 357                         pos->offset = EOF;
 358                         return;
 359                 }
 360                 index = &g_array_index(pos->packet_index, struct packet_index,
 361                                        pos->cur_index);
 362                 pos->mmap_offset = index->offset;
 363
 364                 /* Lookup context/packet size in index */
 365                 pos->content_size = index->content_size;
 366                 pos->packet_size = index->packet_size;
 367                 pos->offset = index->data_offset;
 368         }
 369         /* map new base. Need mapping length from header. */
 370         pos->base = mmap(NULL, pos->packet_size / CHAR_BIT, pos->prot,
 371                          pos->flags, pos->fd, pos->mmap_offset);
 372         if (pos->base == MAP_FAILED) {
 373                 fprintf(stdout, "[error] mmap error %s.\n",
 374                         strerror(errno));
 375                 assert(0);
 376         }
 377 }
 378
 379 static
 380 int packet_metadata(struct ctf_trace *td, FILE *fp)
 381 {
 382         uint32_t magic;
 383         size_t len;
 384         int ret = 0;
 385
 386         len = fread(&magic, sizeof(magic), 1, fp);
 387         if (len != 1) {
 388                 goto end;
 389         }
 390         if (magic == TSDL_MAGIC) {
 391                 ret = 1;
 392                 td->byte_order = BYTE_ORDER;
 393         } else if (magic == GUINT32_SWAP_LE_BE(TSDL_MAGIC)) {
 394                 ret = 1;
 395                 td->byte_order = (BYTE_ORDER == BIG_ENDIAN) ?
 396                                         LITTLE_ENDIAN : BIG_ENDIAN;
 397         }
 398         CTF_TRACE_SET_FIELD(td, byte_order);
 399 end:
 400         rewind(fp);
 401         return ret;
 402 }
 403
 404 static
 405 int ctf_open_trace_metadata_packet_read(struct ctf_trace *td, FILE *in,
 406                                         FILE *out)
 407 {
 408         struct metadata_packet_header header;
 409         size_t readlen, writelen, toread;
 410         char buf[4096];
 411         int ret = 0;
 412
 413         readlen = fread(&header, header_sizeof(header), 1, in);
 414         if (readlen < 1)
 415                 return -EINVAL;
 416
 417         if (td->byte_order != BYTE_ORDER) {
 418                 header.magic = GUINT32_SWAP_LE_BE(header.magic);
 419                 header.checksum = GUINT32_SWAP_LE_BE(header.checksum);
 420                 header.content_size = GUINT32_SWAP_LE_BE(header.content_size);
 421                 header.packet_size = GUINT32_SWAP_LE_BE(header.packet_size);
 422         }
 423         if (header.checksum)
 424                 fprintf(stdout, "[warning] checksum verification not supported yet.\n");
 425         if (header.compression_scheme) {
 426                 fprintf(stdout, "[error] compression (%u) not supported yet.\n",
 427                         header.compression_scheme);
 428                 return -EINVAL;
 429         }
 430         if (header.encryption_scheme) {
 431                 fprintf(stdout, "[error] encryption (%u) not supported yet.\n",
 432                         header.encryption_scheme);
 433                 return -EINVAL;
 434         }
 435         if (header.checksum_scheme) {
 436                 fprintf(stdout, "[error] checksum (%u) not supported yet.\n",
 437                         header.checksum_scheme);
 438                 return -EINVAL;
 439         }
 440         if (!CTF_TRACE_FIELD_IS_SET(td, uuid)) {
 441                 memcpy(td->uuid, header.uuid, sizeof(header.uuid));
 442                 CTF_TRACE_SET_FIELD(td, uuid);
 443         } else {
 444                 if (uuid_compare(header.uuid, td->uuid))
 445                         return -EINVAL;
 446         }
 447
 448         toread = header.content_size / CHAR_BIT;
 449
 450         for (;;) {
 451                 readlen = fread(buf, sizeof(char), min(sizeof(buf), toread), in);
 452                 if (ferror(in)) {
 453                         ret = -EINVAL;
 454                         break;
 455                 }
 456                 printf("read %s\n", buf);
 457                 writelen = fwrite(buf, sizeof(char), readlen, out);
 458                 if (writelen < readlen) {
 459                         ret = -EIO;
 460                         break;
 461                 }
 462                 if (ferror(out)) {
 463                         ret = -EINVAL;
 464                         break;
 465                 }
 466                 toread -= readlen;
 467                 if (!toread) {
 468                         ret = 0;        /* continue reading next packet */
 469                         break;
 470                 }
 471         }
 472         return ret;
 473 }
 474
 475 static
 476 int ctf_open_trace_metadata_stream_read(struct ctf_trace *td, FILE **fp,
 477                                         char **buf)
 478 {
 479         FILE *in, *out;
 480         size_t size;
 481         int ret;
 482
 483         in = *fp;
 484         out = open_memstream(buf, &size);
 485         if (out == NULL)
 486                 return -errno;
 487
 488         for (;;) {
 489                 ret = ctf_open_trace_metadata_packet_read(td, in, out);
 490                 if (ret) {
 491                         break;
 492                 }
 493                 if (feof(in)) {
 494                         ret = 0;
 495                         break;
 496                 }
 497         }
 498         fclose(out);    /* flush the buffer */
 499         fclose(in);
 500         /* open for reading */
 501         *fp = fmemopen(*buf, size, "rb");
 502         return 0;
 503 }
 504
 505 static
 506 int ctf_open_trace_metadata_read(struct ctf_trace *td)
 507 {
 508         struct ctf_scanner *scanner;
 509         FILE *fp;
 510         char *buf = NULL;
 511         int ret = 0;
 512
 513         td->metadata.pos.fd = openat(td->dirfd, "metadata", O_RDONLY);
 514         if (td->metadata.pos.fd < 0) {
 515                 fprintf(stdout, "Unable to open metadata.\n");
 516                 return td->metadata.pos.fd;
 517         }
 518
 519         if (babeltrace_debug)
 520                 yydebug = 1;
 521
 522         fp = fdopen(td->metadata.pos.fd, "r");
 523         if (!fp) {
 524                 fprintf(stdout, "[error] Unable to open metadata stream.\n");
 525                 ret = -errno;
 526                 goto end_stream;
 527         }
 528
 529         if (packet_metadata(td, fp)) {
 530                 ret = ctf_open_trace_metadata_stream_read(td, &fp, &buf);
 531                 if (ret)
 532                         goto end_packet_read;
 533         }
 534
 535         scanner = ctf_scanner_alloc(fp);
 536         if (!scanner) {
 537                 fprintf(stdout, "[error] Error allocating scanner\n");
 538                 ret = -ENOMEM;
 539                 goto end_scanner_alloc;
 540         }
 541         ret = ctf_scanner_append_ast(scanner);
 542         if (ret) {
 543                 fprintf(stdout, "[error] Error creating AST\n");
 544                 goto end;
 545         }
 546
 547         if (babeltrace_debug) {
 548                 ret = ctf_visitor_print_xml(stdout, 0, &scanner->ast->root);
 549                 if (ret) {
 550                         fprintf(stdout, "[error] Error visiting AST for XML output\n");
 551                         goto end;
 552                 }
 553         }
 554
 555         ret = ctf_visitor_semantic_check(stdout, 0, &scanner->ast->root);
 556         if (ret) {
 557                 fprintf(stdout, "[error] Error in CTF semantic validation %d\n", ret);
 558                 goto end;
 559         }
 560         ret = ctf_visitor_construct_metadata(stdout, 0, &scanner->ast->root,
 561                         td, BYTE_ORDER);
 562         if (ret) {
 563                 fprintf(stdout, "[error] Error in CTF metadata constructor %d\n", ret);
 564                 goto end;
 565         }
 566 end:
 567         ctf_scanner_free(scanner);
 568 end_scanner_alloc:
 569 end_packet_read:
 570         fclose(fp);
 571         free(buf);
 572 end_stream:
 573         close(td->metadata.pos.fd);
 574         return ret;
 575 }
 576
 577
 578 static
 579 int create_stream_packet_index(struct ctf_trace *td,
 580                                struct ctf_file_stream *file_stream)
 581 {
 582         struct ctf_stream_class *stream;
 583         int len_index;
 584         struct ctf_stream_pos *pos;
 585         struct stat filestats;
 586         struct packet_index packet_index;
 587         int first_packet = 1;
 588         int ret;
 589
 590         pos = &file_stream->pos;
 591
 592         ret = fstat(pos->fd, &filestats);
 593         if (ret < 0)
 594                 return ret;
 595
 596         for (pos->mmap_offset = 0; pos->mmap_offset < filestats.st_size; ) {
 597                 uint64_t stream_id = 0;
 598
 599                 if (pos->base) {
 600                         /* unmap old base */
 601                         ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 602                         if (ret) {
 603                                 fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 604                                         strerror(errno));
 605                                 return ret;
 606                         }
 607                         pos->base = NULL;
 608                 }
 609                 /* map new base. Need mapping length from header. */
 610                 pos->base = mmap(NULL, MAX_PACKET_HEADER_LEN / CHAR_BIT, PROT_READ,
 611                                  MAP_PRIVATE, pos->fd, pos->mmap_offset);
 612                 pos->content_size = MAX_PACKET_HEADER_LEN;      /* Unknown at this point */
 613                 pos->packet_size = MAX_PACKET_HEADER_LEN;       /* Unknown at this point */
 614                 pos->offset = 0;        /* Position of the packet header */
 615
 616                 packet_index.offset = pos->mmap_offset;
 617                 packet_index.content_size = 0;
 618                 packet_index.packet_size = 0;
 619
 620                 /* read and check header, set stream id (and check) */
 621                 if (td->packet_header) {
 622                         /* Read packet header */
 623                         ret = generic_rw(&pos->parent, &td->packet_header->p);
 624                         if (ret)
 625                                 return ret;
 626                         len_index = struct_declaration_lookup_field_index(td->packet_header->declaration, g_quark_from_static_string("magic"));
 627                         if (len_index >= 0) {
 628                                 struct definition_integer *defint;
 629                                 struct definition *field;
 630
 631                                 field = struct_definition_get_field_from_index(td->packet_header, len_index);
 632                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 633                                 defint = container_of(field, struct definition_integer, p);
 634                                 assert(defint->declaration->signedness == FALSE);
 635                                 if (defint->value._unsigned != CTF_MAGIC) {
 636                                         fprintf(stdout, "[error] Invalid magic number 0x%" PRIX64 " at packet %u (file offset %zd).\n",
 637                                                         defint->value._unsigned,
 638                                                         file_stream->pos.packet_index->len,
 639                                                         (ssize_t) pos->mmap_offset);
 640                                         return -EINVAL;
 641                                 }
 642                         }
 643
 644                         /* check uuid */
 645                         len_index = struct_declaration_lookup_field_index(td->packet_header->declaration, g_quark_from_static_string("uuid"));
 646                         if (len_index >= 0) {
 647                                 struct definition_array *defarray;
 648                                 struct definition *field;
 649                                 uint64_t i;
 650                                 uint8_t uuidval[UUID_LEN];
 651
 652                                 field = struct_definition_get_field_from_index(td->packet_header, len_index);
 653                                 assert(field->declaration->id == CTF_TYPE_ARRAY);
 654                                 defarray = container_of(field, struct definition_array, p);
 655                                 assert(array_len(defarray) == UUID_LEN);
 656                                 assert(defarray->declaration->elem->id == CTF_TYPE_INTEGER);
 657
 658                                 for (i = 0; i < UUID_LEN; i++) {
 659                                         struct definition *elem;
 660                                         struct definition_integer *defint;
 661
 662                                         elem = array_index(defarray, i);
 663                                         assert(elem);
 664                                         defint = container_of(elem, struct definition_integer, p);
 665                                         uuidval[i] = defint->value._unsigned;
 666                                 }
 667                                 ret = uuid_compare(td->uuid, uuidval);
 668                                 if (ret) {
 669                                         fprintf(stdout, "[error] Unique Universal Identifiers do not match.\n");
 670                                         return -EINVAL;
 671                                 }
 672                         }
 673
 674
 675                         len_index = struct_declaration_lookup_field_index(td->packet_header->declaration, g_quark_from_static_string("stream_id"));
 676                         if (len_index >= 0) {
 677                                 struct definition_integer *defint;
 678                                 struct definition *field;
 679
 680                                 field = struct_definition_get_field_from_index(td->packet_header, len_index);
 681                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 682                                 defint = container_of(field, struct definition_integer, p);
 683                                 assert(defint->declaration->signedness == FALSE);
 684                                 stream_id = defint->value._unsigned;
 685                         }
 686                 }
 687
 688                 if (!first_packet && file_stream->stream_id != stream_id) {
 689                         fprintf(stdout, "[error] Stream ID is changing within a stream.\n");
 690                         return -EINVAL;
 691                 }
 692                 if (first_packet) {
 693                         file_stream->stream_id = stream_id;
 694                         if (stream_id >= td->streams->len) {
 695                                 fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
 696                                 return -EINVAL;
 697                         }
 698                         stream = g_ptr_array_index(td->streams, stream_id);
 699                         if (!stream) {
 700                                 fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
 701                                 return -EINVAL;
 702                         }
 703                         file_stream->stream.stream_class = stream;
 704                 }
 705                 first_packet = 0;
 706
 707                 if (stream->packet_context) {
 708                         /* Read packet context */
 709                         ret = generic_rw(&pos->parent, &stream->packet_context->p);
 710                         if (ret)
 711                                 return ret;
 712                         /* read content size from header */
 713                         len_index = struct_declaration_lookup_field_index(stream->packet_context->declaration, g_quark_from_static_string("content_size"));
 714                         if (len_index >= 0) {
 715                                 struct definition_integer *defint;
 716                                 struct definition *field;
 717
 718                                 field = struct_definition_get_field_from_index(stream->packet_context, len_index);
 719                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 720                                 defint = container_of(field, struct definition_integer, p);
 721                                 assert(defint->declaration->signedness == FALSE);
 722                                 packet_index.content_size = defint->value._unsigned;
 723                         } else {
 724                                 /* Use file size for packet size */
 725                                 packet_index.content_size = filestats.st_size * CHAR_BIT;
 726                         }
 727
 728                         /* read packet size from header */
 729                         len_index = struct_declaration_lookup_field_index(stream->packet_context->declaration, g_quark_from_static_string("packet_size"));
 730                         if (len_index >= 0) {
 731                                 struct definition_integer *defint;
 732                                 struct definition *field;
 733
 734                                 field = struct_definition_get_field_from_index(stream->packet_context, len_index);
 735                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 736                                 defint = container_of(field, struct definition_integer, p);
 737                                 assert(defint->declaration->signedness == FALSE);
 738                                 packet_index.packet_size = defint->value._unsigned;
 739                         } else {
 740                                 /* Use content size if non-zero, else file size */
 741                                 packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
 742                         }
 743                 } else {
 744                         /* Use file size for packet size */
 745                         packet_index.content_size = filestats.st_size * CHAR_BIT;
 746                         /* Use content size if non-zero, else file size */
 747                         packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
 748                 }
 749
 750                 /* Validate content size and packet size values */
 751                 if (packet_index.content_size > packet_index.packet_size) {
 752                         fprintf(stdout, "[error] Content size (%zu bits) is larger than packet size (%zu bits).\n",
 753                                 packet_index.content_size, packet_index.packet_size);
 754                         return -EINVAL;
 755                 }
 756
 757                 if (packet_index.packet_size > (filestats.st_size - packet_index.offset) * CHAR_BIT) {
 758                         fprintf(stdout, "[error] Packet size (%zu bits) is larger than remaining file size (%zu bits).\n",
 759                                 packet_index.content_size, (filestats.st_size - packet_index.offset) * CHAR_BIT);
 760                         return -EINVAL;
 761                 }
 762
 763                 /* Save position after header and context */
 764                 packet_index.data_offset = pos->offset;
 765
 766                 /* add index to packet array */
 767                 g_array_append_val(file_stream->pos.packet_index, packet_index);
 768
 769                 pos->mmap_offset += packet_index.packet_size / CHAR_BIT;
 770         }
 771
 772         /* Move pos back to beginning of file */
 773         ctf_move_pos_slow(pos, 0, SEEK_SET);    /* position for write */
 774
 775         return 0;
 776 }
 777
 778 /*
 779  * Note: many file streams can inherit from the same stream class
 780  * description (metadata).
 781  */
 782 static
 783 int ctf_open_file_stream_read(struct ctf_trace *td, const char *path, int flags)
 784 {
 785         int ret;
 786         struct ctf_file_stream *file_stream;
 787
 788         ret = openat(td->dirfd, path, flags);
 789         if (ret < 0)
 790                 goto error;
 791         file_stream = g_new0(struct ctf_file_stream, 1);
 792         ctf_init_pos(&file_stream->pos, ret, flags);
 793         ret = create_stream_packet_index(td, file_stream);
 794         if (ret)
 795                 goto error_index;
 796         /* Add stream file to stream class */
 797         g_ptr_array_add(file_stream->stream.stream_class->files, file_stream);
 798         return 0;
 799
 800 error_index:
 801         ctf_fini_pos(&file_stream->pos);
 802         close(file_stream->pos.fd);
 803         g_free(file_stream);
 804 error:
 805         return ret;
 806 }
 807
 808 static
 809 int ctf_open_trace_read(struct ctf_trace *td, const char *path, int flags)
 810 {
 811         int ret;
 812         struct dirent *dirent;
 813         struct dirent *diriter;
 814         size_t dirent_len;
 815
 816         td->flags = flags;
 817
 818         /* Open trace directory */
 819         td->dir = opendir(path);
 820         if (!td->dir) {
 821                 fprintf(stdout, "[error] Unable to open trace directory.\n");
 822                 ret = -ENOENT;
 823                 goto error;
 824         }
 825
 826         td->dirfd = open(path, 0);
 827         if (td->dirfd < 0) {
 828                 fprintf(stdout, "[error] Unable to open trace directory file descriptor.\n");
 829                 ret = -ENOENT;
 830                 goto error_dirfd;
 831         }
 832
 833         /*
 834          * Keep the metadata file separate.
 835          */
 836
 837         ret = ctf_open_trace_metadata_read(td);
 838         if (ret) {
 839                 goto error_metadata;
 840         }
 841
 842         /*
 843          * Open each stream: for each file, try to open, check magic
 844          * number, and get the stream ID to add to the right location in
 845          * the stream array.
 846          */
 847
 848         dirent_len = offsetof(struct dirent, d_name) +
 849                         fpathconf(td->dirfd, _PC_NAME_MAX) + 1;
 850
 851         dirent = malloc(dirent_len);
 852
 853         for (;;) {
 854                 ret = readdir_r(td->dir, dirent, &diriter);
 855                 if (ret) {
 856                         fprintf(stdout, "[error] Readdir error.\n");
 857                         goto readdir_error;
 858                 }
 859                 if (!diriter)
 860                         break;
 861                 /* Ignore hidden files, ., .. and metadata. */
 862                 if (!strncmp(diriter->d_name, ".", 1)
 863                                 || !strcmp(diriter->d_name, "..")
 864                                 || !strcmp(diriter->d_name, "metadata"))
 865                         continue;
 866                 ret = ctf_open_file_stream_read(td, diriter->d_name, flags);
 867                 if (ret) {
 868                         fprintf(stdout, "[error] Open file stream error.\n");
 869                         goto readdir_error;
 870                 }
 871         }
 872
 873         free(dirent);
 874         return 0;
 875
 876 readdir_error:
 877         free(dirent);
 878 error_metadata:
 879         close(td->dirfd);
 880 error_dirfd:
 881         closedir(td->dir);
 882 error:
 883         return ret;
 884 }
 885
 886 struct trace_descriptor *ctf_open_trace(const char *path, int flags)
 887 {
 888         struct ctf_trace *td;
 889         int ret;
 890
 891         td = g_new0(struct ctf_trace, 1);
 892
 893         switch (flags & O_ACCMODE) {
 894         case O_RDONLY:
 895                 if (!path) {
 896                         fprintf(stdout, "[error] Path missing for input CTF trace.\n");
 897                         goto error;
 898                 }
 899                 ret = ctf_open_trace_read(td, path, flags);
 900                 if (ret)
 901                         goto error;
 902                 break;
 903         case O_RDWR:
 904                 fprintf(stdout, "[error] Opening CTF traces for output is not supported yet.\n");
 905                 goto error;
 906         default:
 907                 fprintf(stdout, "[error] Incorrect open flags.\n");
 908                 goto error;
 909         }
 910
 911         return &td->parent;
 912 error:
 913         g_free(td);
 914         return NULL;
 915 }
 916
 917 static
 918 void ctf_close_file_stream(struct ctf_file_stream *file_stream)
 919 {
 920         ctf_fini_pos(&file_stream->pos);
 921         close(file_stream->pos.fd);
 922 }
 923
 924 void ctf_close_trace(struct trace_descriptor *tdp)
 925 {
 926         struct ctf_trace *td = container_of(tdp, struct ctf_trace, parent);
 927         int i;
 928
 929         if (td->streams) {
 930                 for (i = 0; i < td->streams->len; i++) {
 931                         struct ctf_stream_class *stream;
 932                         int j;
 933                         stream = g_ptr_array_index(td->streams, i);
 934                         for (j = 0; j < stream->files->len; j++) {
 935                                 struct ctf_file_stream *file_stream;
 936                                 file_stream = g_ptr_array_index(stream->files, j);
 937                                 ctf_close_file_stream(file_stream);
 938                         }
 939
 940                 }
 941                 g_ptr_array_free(td->streams, TRUE);
 942         }
 943         closedir(td->dir);
 944         g_free(td);
 945 }
 946
 947 void __attribute__((constructor)) ctf_init(void)
 948 {
 949         int ret;
 950
 951         ctf_format.name = g_quark_from_static_string("ctf");
 952         ret = bt_register_format(&ctf_format);
 953         assert(!ret);
 954 }
 955
 956 /* TODO: finalize */