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 static
  56 struct trace_descriptor *ctf_open_trace(const char *path, int flags);
  57 static
  58 void ctf_close_trace(struct trace_descriptor *descriptor);
  59
  60 static
  61 rw_dispatch read_dispatch_table[] = {
  62         [ CTF_TYPE_INTEGER ] = ctf_integer_read,
  63         [ CTF_TYPE_FLOAT ] = ctf_float_read,
  64         [ CTF_TYPE_ENUM ] = ctf_enum_read,
  65         [ CTF_TYPE_STRING ] = ctf_string_read,
  66         [ CTF_TYPE_STRUCT ] = ctf_struct_rw,
  67         [ CTF_TYPE_VARIANT ] = ctf_variant_rw,
  68         [ CTF_TYPE_ARRAY ] = ctf_array_read,
  69         [ CTF_TYPE_SEQUENCE ] = ctf_sequence_read,
  70 };
  71
  72 static
  73 rw_dispatch write_dispatch_table[] = {
  74         [ CTF_TYPE_INTEGER ] = ctf_integer_write,
  75         [ CTF_TYPE_FLOAT ] = ctf_float_write,
  76         [ CTF_TYPE_ENUM ] = ctf_enum_write,
  77         [ CTF_TYPE_STRING ] = ctf_string_write,
  78         [ CTF_TYPE_STRUCT ] = ctf_struct_rw,
  79         [ CTF_TYPE_VARIANT ] = ctf_variant_rw,
  80         [ CTF_TYPE_ARRAY ] = ctf_array_write,
  81         [ CTF_TYPE_SEQUENCE ] = ctf_sequence_write,
  82 };
  83
  84 static
  85 struct format ctf_format = {
  86         .open_trace = ctf_open_trace,
  87         .close_trace = ctf_close_trace,
  88 };
  89
  90 static
  91 void ctf_update_timestamp(struct ctf_stream *stream,
  92                           struct definition_integer *integer_definition)
  93 {
  94         struct declaration_integer *integer_declaration =
  95                 integer_definition->declaration;
  96         uint64_t oldval, newval, updateval;
  97
  98         if (integer_declaration->len == 64) {
  99                 stream->timestamp = integer_definition->value._unsigned;
 100                 return;
 101         }
 102         /* keep low bits */
 103         oldval = stream->timestamp;
 104         oldval &= (1ULL << integer_declaration->len) - 1;
 105         newval = integer_definition->value._unsigned;
 106         /* Test for overflow by comparing low bits */
 107         if (newval < oldval)
 108                 newval += 1ULL << integer_declaration->len;
 109         /* updateval contains old high bits, and new low bits (sum) */
 110         updateval = stream->timestamp;
 111         updateval &= ~((1ULL << integer_declaration->len) - 1);
 112         updateval += newval;
 113         stream->timestamp = updateval;
 114 }
 115
 116 static
 117 int ctf_read_event(struct stream_pos *ppos, struct ctf_stream *stream)
 118 {
 119         struct ctf_stream_pos *pos =
 120                 container_of(ppos, struct ctf_stream_pos, parent);
 121         struct ctf_stream_class *stream_class = stream->stream_class;
 122         struct ctf_file_event *event;
 123         uint64_t id = 0;
 124         int ret;
 125
 126         if (pos->offset == EOF)
 127                 return EOF;
 128
 129         /* Read event header */
 130         if (stream->stream_event_header) {
 131                 struct definition_integer *integer_definition;
 132                 struct definition *variant;
 133
 134                 ret = generic_rw(ppos, &stream->stream_event_header->p);
 135                 if (ret)
 136                         goto error;
 137                 /* lookup event id */
 138                 integer_definition = lookup_integer(&stream->stream_event_header->p, "id", FALSE);
 139                 if (integer_definition) {
 140                         id = integer_definition->value._unsigned;
 141                 } else {
 142                         struct definition_enum *enum_definition;
 143
 144                         enum_definition = lookup_enum(&stream->stream_event_header->p, "id", FALSE);
 145                         if (enum_definition) {
 146                                 id = enum_definition->integer->value._unsigned;
 147                         }
 148                 }
 149
 150                 variant = lookup_variant(&stream->stream_event_header->p, "v");
 151                 if (variant) {
 152                         integer_definition = lookup_integer(variant, "id", FALSE);
 153                         if (integer_definition) {
 154                                 id = integer_definition->value._unsigned;
 155                         }
 156                 }
 157
 158                 /* lookup timestamp */
 159                 integer_definition = lookup_integer(&stream->stream_event_header->p, "timestamp", FALSE);
 160                 if (integer_definition) {
 161                         ctf_update_timestamp(stream, integer_definition);
 162                 } else {
 163                         if (variant) {
 164                                 integer_definition = lookup_integer(variant, "timestamp", FALSE);
 165                                 if (integer_definition) {
 166                                         ctf_update_timestamp(stream, integer_definition);
 167                                 }
 168                         }
 169                 }
 170         }
 171
 172         /* Read stream-declared event context */
 173         if (stream->stream_event_context) {
 174                 ret = generic_rw(ppos, &stream->stream_event_context->p);
 175                 if (ret)
 176                         goto error;
 177         }
 178
 179         if (id >= stream_class->events_by_id->len) {
 180                 fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
 181                 return -EINVAL;
 182         }
 183         event = g_ptr_array_index(stream->events_by_id, id);
 184         if (!event) {
 185                 fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
 186                 return -EINVAL;
 187         }
 188
 189         /* Read event-declared event context */
 190         if (event->event_context) {
 191                 ret = generic_rw(ppos, &event->event_context->p);
 192                 if (ret)
 193                         goto error;
 194         }
 195
 196         /* Read event payload */
 197         if (event->event_fields) {
 198                 ret = generic_rw(ppos, &event->event_fields->p);
 199                 if (ret)
 200                         goto error;
 201         }
 202
 203         return 0;
 204
 205 error:
 206         fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
 207         return ret;
 208 }
 209
 210 static
 211 int ctf_write_event(struct stream_pos *pos, struct ctf_stream *stream)
 212 {
 213         struct ctf_stream_class *stream_class = stream->stream_class;
 214         struct ctf_file_event *event;
 215         uint64_t id = 0;
 216         int ret;
 217
 218         /* print event header */
 219         if (stream->stream_event_header) {
 220                 struct definition_integer *integer_definition;
 221                 struct definition *variant;
 222
 223                 /* lookup event id */
 224                 integer_definition = lookup_integer(&stream->stream_event_header->p, "id", FALSE);
 225                 if (integer_definition) {
 226                         id = integer_definition->value._unsigned;
 227                 } else {
 228                         struct definition_enum *enum_definition;
 229
 230                         enum_definition = lookup_enum(&stream->stream_event_header->p, "id", FALSE);
 231                         if (enum_definition) {
 232                                 id = enum_definition->integer->value._unsigned;
 233                         }
 234                 }
 235
 236                 variant = lookup_variant(&stream->stream_event_header->p, "v");
 237                 if (variant) {
 238                         integer_definition = lookup_integer(variant, "id", FALSE);
 239                         if (integer_definition) {
 240                                 id = integer_definition->value._unsigned;
 241                         }
 242                 }
 243
 244                 ret = generic_rw(pos, &stream->stream_event_header->p);
 245                 if (ret)
 246                         goto error;
 247         }
 248
 249         /* print stream-declared event context */
 250         if (stream->stream_event_context) {
 251                 ret = generic_rw(pos, &stream->stream_event_context->p);
 252                 if (ret)
 253                         goto error;
 254         }
 255
 256         if (id >= stream_class->events_by_id->len) {
 257                 fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
 258                 return -EINVAL;
 259         }
 260         event = g_ptr_array_index(stream->events_by_id, id);
 261         if (!event) {
 262                 fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
 263                 return -EINVAL;
 264         }
 265
 266         /* print event-declared event context */
 267         if (event->event_context) {
 268                 ret = generic_rw(pos, &event->event_context->p);
 269                 if (ret)
 270                         goto error;
 271         }
 272
 273         /* Read and print event payload */
 274         if (event->event_fields) {
 275                 ret = generic_rw(pos, &event->event_fields->p);
 276                 if (ret)
 277                         goto error;
 278         }
 279
 280         return 0;
 281
 282 error:
 283         fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
 284         return ret;
 285 }
 286
 287 void ctf_init_pos(struct ctf_stream_pos *pos, int fd, int open_flags)
 288 {
 289         pos->fd = fd;
 290         pos->mmap_offset = 0;
 291         pos->packet_size = 0;
 292         pos->content_size = 0;
 293         pos->content_size_loc = NULL;
 294         pos->base = NULL;
 295         pos->offset = 0;
 296         pos->dummy = false;
 297         pos->cur_index = 0;
 298         if (fd >= 0)
 299                 pos->packet_index = g_array_new(FALSE, TRUE,
 300                                                 sizeof(struct packet_index));
 301         else
 302                 pos->packet_index = NULL;
 303         switch (open_flags & O_ACCMODE) {
 304         case O_RDONLY:
 305                 pos->prot = PROT_READ;
 306                 pos->flags = MAP_PRIVATE;
 307                 pos->parent.rw_table = read_dispatch_table;
 308                 pos->parent.event_cb = ctf_read_event;
 309                 break;
 310         case O_RDWR:
 311                 pos->prot = PROT_WRITE; /* Write has priority */
 312                 pos->flags = MAP_SHARED;
 313                 pos->parent.rw_table = write_dispatch_table;
 314                 pos->parent.event_cb = ctf_write_event;
 315                 if (fd >= 0)
 316                         ctf_move_pos_slow(pos, 0, SEEK_SET);    /* position for write */
 317                 break;
 318         default:
 319                 assert(0);
 320         }
 321 }
 322
 323 void ctf_fini_pos(struct ctf_stream_pos *pos)
 324 {
 325         int ret;
 326
 327         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 328                 *pos->content_size_loc = pos->offset;
 329         if (pos->base) {
 330                 /* unmap old base */
 331                 ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 332                 if (ret) {
 333                         fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 334                                 strerror(errno));
 335                         assert(0);
 336                 }
 337         }
 338         (void) g_array_free(pos->packet_index, TRUE);
 339 }
 340
 341 void ctf_move_pos_slow(struct ctf_stream_pos *pos, size_t offset, int whence)
 342 {
 343         struct ctf_file_stream *file_stream =
 344                 container_of(pos, struct ctf_file_stream, pos);
 345         int ret;
 346         off_t off;
 347         struct packet_index *index;
 348
 349         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 350                 *pos->content_size_loc = pos->offset;
 351
 352         if (pos->base) {
 353                 /* unmap old base */
 354                 ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 355                 if (ret) {
 356                         fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 357                                 strerror(errno));
 358                         assert(0);
 359                 }
 360                 pos->base = NULL;
 361         }
 362
 363         /*
 364          * The caller should never ask for ctf_move_pos across packets,
 365          * except to get exactly at the beginning of the next packet.
 366          */
 367         if (pos->prot == PROT_WRITE) {
 368                 switch (whence) {
 369                 case SEEK_CUR:
 370                         /* The writer will add padding */
 371                         assert(pos->offset + offset == pos->packet_size);
 372                         pos->mmap_offset += WRITE_PACKET_LEN / CHAR_BIT;
 373                         break;
 374                 case SEEK_SET:
 375                         assert(offset == 0);    /* only seek supported for now */
 376                         pos->cur_index = 0;
 377                         break;
 378                 default:
 379                         assert(0);
 380                 }
 381                 pos->content_size = -1U;        /* Unknown at this point */
 382                 pos->packet_size = WRITE_PACKET_LEN;
 383                 off = posix_fallocate(pos->fd, pos->mmap_offset,
 384                                       pos->packet_size / CHAR_BIT);
 385                 assert(off >= 0);
 386                 pos->offset = 0;
 387         } else {
 388                 switch (whence) {
 389                 case SEEK_CUR:
 390                         /* The reader will expect us to skip padding */
 391                         assert(pos->offset + offset == pos->content_size);
 392                         ++pos->cur_index;
 393                         break;
 394                 case SEEK_SET:
 395                         assert(offset == 0);    /* only seek supported for now */
 396                         pos->cur_index = 0;
 397                         break;
 398                 default:
 399                         assert(0);
 400                 }
 401                 if (pos->cur_index >= pos->packet_index->len) {
 402                         pos->offset = EOF;
 403                         return;
 404                 }
 405                 index = &g_array_index(pos->packet_index, struct packet_index,
 406                                        pos->cur_index);
 407                 pos->mmap_offset = index->offset;
 408
 409                 /* Lookup context/packet size in index */
 410                 file_stream->stream.timestamp = index->timestamp_begin;
 411                 pos->content_size = index->content_size;
 412                 pos->packet_size = index->packet_size;
 413                 if (index->data_offset < index->content_size)
 414                         pos->offset = 0;        /* will read headers */
 415                 else {
 416                         pos->offset = EOF;
 417                         return;
 418                 }
 419         }
 420         /* map new base. Need mapping length from header. */
 421         pos->base = mmap(NULL, pos->packet_size / CHAR_BIT, pos->prot,
 422                          pos->flags, pos->fd, pos->mmap_offset);
 423         if (pos->base == MAP_FAILED) {
 424                 fprintf(stdout, "[error] mmap error %s.\n",
 425                         strerror(errno));
 426                 assert(0);
 427         }
 428
 429         /* update trace_packet_header and stream_packet_context */
 430         if (file_stream->stream.trace_packet_header) {
 431                 /* Read packet header */
 432                 ret = generic_rw(&pos->parent, &file_stream->stream.trace_packet_header->p);
 433                 assert(!ret);
 434         }
 435         if (file_stream->stream.stream_packet_context) {
 436                 /* Read packet context */
 437                 ret = generic_rw(&pos->parent, &file_stream->stream.stream_packet_context->p);
 438                 assert(!ret);
 439         }
 440 }
 441
 442 static
 443 int packet_metadata(struct ctf_trace *td, FILE *fp)
 444 {
 445         uint32_t magic;
 446         size_t len;
 447         int ret = 0;
 448
 449         len = fread(&magic, sizeof(magic), 1, fp);
 450         if (len != 1) {
 451                 goto end;
 452         }
 453         if (magic == TSDL_MAGIC) {
 454                 ret = 1;
 455                 td->byte_order = BYTE_ORDER;
 456         } else if (magic == GUINT32_SWAP_LE_BE(TSDL_MAGIC)) {
 457                 ret = 1;
 458                 td->byte_order = (BYTE_ORDER == BIG_ENDIAN) ?
 459                                         LITTLE_ENDIAN : BIG_ENDIAN;
 460         }
 461         CTF_TRACE_SET_FIELD(td, byte_order);
 462 end:
 463         rewind(fp);
 464         return ret;
 465 }
 466
 467 static
 468 int ctf_open_trace_metadata_packet_read(struct ctf_trace *td, FILE *in,
 469                                         FILE *out)
 470 {
 471         struct metadata_packet_header header;
 472         size_t readlen, writelen, toread;
 473         char buf[4096];
 474         int ret = 0;
 475
 476         readlen = fread(&header, header_sizeof(header), 1, in);
 477         if (readlen < 1)
 478                 return -EINVAL;
 479
 480         if (td->byte_order != BYTE_ORDER) {
 481                 header.magic = GUINT32_SWAP_LE_BE(header.magic);
 482                 header.checksum = GUINT32_SWAP_LE_BE(header.checksum);
 483                 header.content_size = GUINT32_SWAP_LE_BE(header.content_size);
 484                 header.packet_size = GUINT32_SWAP_LE_BE(header.packet_size);
 485         }
 486         if (header.checksum)
 487                 fprintf(stdout, "[warning] checksum verification not supported yet.\n");
 488         if (header.compression_scheme) {
 489                 fprintf(stdout, "[error] compression (%u) not supported yet.\n",
 490                         header.compression_scheme);
 491                 return -EINVAL;
 492         }
 493         if (header.encryption_scheme) {
 494                 fprintf(stdout, "[error] encryption (%u) not supported yet.\n",
 495                         header.encryption_scheme);
 496                 return -EINVAL;
 497         }
 498         if (header.checksum_scheme) {
 499                 fprintf(stdout, "[error] checksum (%u) not supported yet.\n",
 500                         header.checksum_scheme);
 501                 return -EINVAL;
 502         }
 503         if (!CTF_TRACE_FIELD_IS_SET(td, uuid)) {
 504                 memcpy(td->uuid, header.uuid, sizeof(header.uuid));
 505                 CTF_TRACE_SET_FIELD(td, uuid);
 506         } else {
 507                 if (uuid_compare(header.uuid, td->uuid))
 508                         return -EINVAL;
 509         }
 510
 511         toread = header.content_size / CHAR_BIT;
 512
 513         for (;;) {
 514                 readlen = fread(buf, sizeof(char), min(sizeof(buf), toread), in);
 515                 if (ferror(in)) {
 516                         ret = -EINVAL;
 517                         break;
 518                 }
 519                 if (babeltrace_debug) {
 520                         fprintf(stdout, "[debug] metadata packet read: %s\n",
 521                                 buf);
 522                 }
 523
 524                 writelen = fwrite(buf, sizeof(char), readlen, out);
 525                 if (writelen < readlen) {
 526                         ret = -EIO;
 527                         break;
 528                 }
 529                 if (ferror(out)) {
 530                         ret = -EINVAL;
 531                         break;
 532                 }
 533                 toread -= readlen;
 534                 if (!toread) {
 535                         ret = 0;        /* continue reading next packet */
 536                         break;
 537                 }
 538         }
 539         return ret;
 540 }
 541
 542 static
 543 int ctf_open_trace_metadata_stream_read(struct ctf_trace *td, FILE **fp,
 544                                         char **buf)
 545 {
 546         FILE *in, *out;
 547         size_t size;
 548         int ret;
 549
 550         in = *fp;
 551         /*
 552          * Using strlen on *buf instead of size of open_memstream
 553          * because its size includes garbage at the end (after final
 554          * \0). This is the allocated size, not the actual string size.
 555          */
 556         out = open_memstream(buf, &size);
 557         if (out == NULL)
 558                 return -errno;
 559
 560         for (;;) {
 561                 ret = ctf_open_trace_metadata_packet_read(td, in, out);
 562                 if (ret) {
 563                         break;
 564                 }
 565                 if (feof(in)) {
 566                         ret = 0;
 567                         break;
 568                 }
 569         }
 570         fclose(out);    /* flush the buffer */
 571         fclose(in);
 572         /* open for reading */
 573         *fp = fmemopen(*buf, strlen(*buf), "rb");
 574         return 0;
 575 }
 576
 577 static
 578 int ctf_open_trace_metadata_read(struct ctf_trace *td)
 579 {
 580         struct ctf_scanner *scanner;
 581         FILE *fp;
 582         char *buf = NULL;
 583         int ret = 0;
 584
 585         td->metadata.pos.fd = openat(td->dirfd, "metadata", O_RDONLY);
 586         if (td->metadata.pos.fd < 0) {
 587                 fprintf(stdout, "Unable to open metadata.\n");
 588                 return td->metadata.pos.fd;
 589         }
 590
 591         if (babeltrace_debug)
 592                 yydebug = 1;
 593
 594         fp = fdopen(td->metadata.pos.fd, "r");
 595         if (!fp) {
 596                 fprintf(stdout, "[error] Unable to open metadata stream.\n");
 597                 ret = -errno;
 598                 goto end_stream;
 599         }
 600
 601         if (packet_metadata(td, fp)) {
 602                 ret = ctf_open_trace_metadata_stream_read(td, &fp, &buf);
 603                 if (ret)
 604                         goto end_packet_read;
 605         }
 606
 607         scanner = ctf_scanner_alloc(fp);
 608         if (!scanner) {
 609                 fprintf(stdout, "[error] Error allocating scanner\n");
 610                 ret = -ENOMEM;
 611                 goto end_scanner_alloc;
 612         }
 613         ret = ctf_scanner_append_ast(scanner);
 614         if (ret) {
 615                 fprintf(stdout, "[error] Error creating AST\n");
 616                 goto end;
 617         }
 618
 619         if (babeltrace_debug) {
 620                 ret = ctf_visitor_print_xml(stdout, 0, &scanner->ast->root);
 621                 if (ret) {
 622                         fprintf(stdout, "[error] Error visiting AST for XML output\n");
 623                         goto end;
 624                 }
 625         }
 626
 627         ret = ctf_visitor_semantic_check(stdout, 0, &scanner->ast->root);
 628         if (ret) {
 629                 fprintf(stdout, "[error] Error in CTF semantic validation %d\n", ret);
 630                 goto end;
 631         }
 632         ret = ctf_visitor_construct_metadata(stdout, 0, &scanner->ast->root,
 633                         td, BYTE_ORDER);
 634         if (ret) {
 635                 fprintf(stdout, "[error] Error in CTF metadata constructor %d\n", ret);
 636                 goto end;
 637         }
 638 end:
 639         ctf_scanner_free(scanner);
 640 end_scanner_alloc:
 641 end_packet_read:
 642         fclose(fp);
 643         free(buf);
 644 end_stream:
 645         close(td->metadata.pos.fd);
 646         return ret;
 647 }
 648
 649 static
 650 struct ctf_file_event *create_event_definitions(struct ctf_trace *td,
 651                                                 struct ctf_stream *stream,
 652                                                 struct ctf_event *event)
 653 {
 654         struct ctf_file_event *file_event = g_new0(struct ctf_file_event, 1);
 655
 656         if (event->context_decl) {
 657                 struct definition *definition =
 658                         event->context_decl->p.definition_new(&event->context_decl->p,
 659                                 stream->parent_def_scope, 0, 0, "event.context");
 660                 if (!definition) {
 661                         goto error;
 662                 }
 663                 file_event->event_context = container_of(definition,
 664                                         struct definition_struct, p);
 665                 stream->parent_def_scope = file_event->event_context->p.scope;
 666         }
 667         if (event->fields_decl) {
 668                 struct definition *definition =
 669                         event->fields_decl->p.definition_new(&event->fields_decl->p,
 670                                 stream->parent_def_scope, 0, 0, "event.fields");
 671                 if (!definition) {
 672                         goto error;
 673                 }
 674                 file_event->event_fields = container_of(definition,
 675                                         struct definition_struct, p);
 676                 stream->parent_def_scope = file_event->event_fields->p.scope;
 677         }
 678         return file_event;
 679
 680 error:
 681         if (file_event->event_fields)
 682                 definition_unref(&file_event->event_fields->p);
 683         if (file_event->event_context)
 684                 definition_unref(&file_event->event_context->p);
 685         return NULL;
 686 }
 687
 688 static
 689 int create_stream_definitions(struct ctf_trace *td, struct ctf_stream *stream)
 690 {
 691         struct ctf_stream_class *stream_class;
 692         int ret;
 693         int i;
 694
 695         if (stream->stream_definitions_created)
 696                 return 0;
 697
 698         stream_class = stream->stream_class;
 699
 700         if (stream_class->packet_context_decl) {
 701                 struct definition *definition =
 702                         stream_class->packet_context_decl->p.definition_new(&stream_class->packet_context_decl->p,
 703                                 stream->parent_def_scope, 0, 0, "stream.packet.context");
 704                 if (!definition) {
 705                         ret = -EINVAL;
 706                         goto error;
 707                 }
 708                 stream->stream_packet_context = container_of(definition,
 709                                                 struct definition_struct, p);
 710                 stream->parent_def_scope = stream->stream_packet_context->p.scope;
 711         }
 712         if (stream_class->event_header_decl) {
 713                 struct definition *definition =
 714                         stream_class->event_header_decl->p.definition_new(&stream_class->event_header_decl->p,
 715                                 stream->parent_def_scope, 0, 0, "stream.event.header");
 716                 if (!definition) {
 717                         ret = -EINVAL;
 718                         goto error;
 719                 }
 720                 stream->stream_event_header =
 721                         container_of(definition, struct definition_struct, p);
 722                 stream->parent_def_scope = stream->stream_event_header->p.scope;
 723         }
 724         if (stream_class->event_context_decl) {
 725                 struct definition *definition =
 726                         stream_class->event_context_decl->p.definition_new(&stream_class->event_context_decl->p,
 727                                 stream->parent_def_scope, 0, 0, "stream.event.context");
 728                 if (!definition) {
 729                         ret = -EINVAL;
 730                         goto error;
 731                 }
 732                 stream->stream_event_context =
 733                         container_of(definition, struct definition_struct, p);
 734                 stream->parent_def_scope = stream->stream_event_context->p.scope;
 735         }
 736         stream->events_by_id = g_ptr_array_new();
 737         g_ptr_array_set_size(stream->events_by_id, stream_class->events_by_id->len);
 738         for (i = 0; i < stream->events_by_id->len; i++) {
 739                 struct ctf_event *event = g_ptr_array_index(stream_class->events_by_id, i);
 740                 struct ctf_file_event *file_event;
 741
 742                 if (!event)
 743                         continue;
 744                 file_event = create_event_definitions(td, stream, event);
 745                 if (!file_event)
 746                         goto error_event;
 747                 g_ptr_array_index(stream->events_by_id, i) = file_event;
 748         }
 749         return 0;
 750
 751 error_event:
 752         for (i = 0; i < stream->events_by_id->len; i++) {
 753                 struct ctf_file_event *file_event = g_ptr_array_index(stream->events_by_id, i);
 754                 if (file_event)
 755                         g_free(file_event);
 756         }
 757         g_ptr_array_free(stream->events_by_id, TRUE);
 758 error:
 759         if (stream->stream_event_context)
 760                 definition_unref(&stream->stream_event_context->p);
 761         if (stream->stream_event_header)
 762                 definition_unref(&stream->stream_event_header->p);
 763         if (stream->stream_packet_context)
 764                 definition_unref(&stream->stream_packet_context->p);
 765         return ret;
 766 }
 767
 768
 769 static
 770 int create_stream_packet_index(struct ctf_trace *td,
 771                                struct ctf_file_stream *file_stream)
 772 {
 773         struct ctf_stream_class *stream;
 774         int len_index;
 775         struct ctf_stream_pos *pos;
 776         struct stat filestats;
 777         struct packet_index packet_index;
 778         int first_packet = 1;
 779         int ret;
 780
 781         pos = &file_stream->pos;
 782
 783         ret = fstat(pos->fd, &filestats);
 784         if (ret < 0)
 785                 return ret;
 786
 787         if (filestats.st_size < MAX_PACKET_HEADER_LEN / CHAR_BIT)
 788                 return -EINVAL;
 789
 790         for (pos->mmap_offset = 0; pos->mmap_offset < filestats.st_size; ) {
 791                 uint64_t stream_id = 0;
 792
 793                 if (pos->base) {
 794                         /* unmap old base */
 795                         ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 796                         if (ret) {
 797                                 fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 798                                         strerror(errno));
 799                                 return ret;
 800                         }
 801                         pos->base = NULL;
 802                 }
 803                 /* map new base. Need mapping length from header. */
 804                 pos->base = mmap(NULL, MAX_PACKET_HEADER_LEN / CHAR_BIT, PROT_READ,
 805                                  MAP_PRIVATE, pos->fd, pos->mmap_offset);
 806                 pos->content_size = MAX_PACKET_HEADER_LEN;      /* Unknown at this point */
 807                 pos->packet_size = MAX_PACKET_HEADER_LEN;       /* Unknown at this point */
 808                 pos->offset = 0;        /* Position of the packet header */
 809
 810                 packet_index.offset = pos->mmap_offset;
 811                 packet_index.content_size = 0;
 812                 packet_index.packet_size = 0;
 813                 packet_index.timestamp_begin = 0;
 814                 packet_index.timestamp_end = 0;
 815
 816                 /* read and check header, set stream id (and check) */
 817                 if (file_stream->stream.trace_packet_header) {
 818                         /* Read packet header */
 819                         ret = generic_rw(&pos->parent, &file_stream->stream.trace_packet_header->p);
 820                         if (ret)
 821                                 return ret;
 822                         len_index = struct_declaration_lookup_field_index(file_stream->stream.trace_packet_header->declaration, g_quark_from_static_string("magic"));
 823                         if (len_index >= 0) {
 824                                 struct definition_integer *defint;
 825                                 struct definition *field;
 826
 827                                 field = struct_definition_get_field_from_index(file_stream->stream.trace_packet_header, len_index);
 828                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 829                                 defint = container_of(field, struct definition_integer, p);
 830                                 assert(defint->declaration->signedness == FALSE);
 831                                 if (defint->value._unsigned != CTF_MAGIC) {
 832                                         fprintf(stdout, "[error] Invalid magic number 0x%" PRIX64 " at packet %u (file offset %zd).\n",
 833                                                         defint->value._unsigned,
 834                                                         file_stream->pos.packet_index->len,
 835                                                         (ssize_t) pos->mmap_offset);
 836                                         return -EINVAL;
 837                                 }
 838                         }
 839
 840                         /* check uuid */
 841                         len_index = struct_declaration_lookup_field_index(file_stream->stream.trace_packet_header->declaration, g_quark_from_static_string("uuid"));
 842                         if (len_index >= 0) {
 843                                 struct definition_array *defarray;
 844                                 struct definition *field;
 845                                 uint64_t i;
 846                                 uint8_t uuidval[UUID_LEN];
 847
 848                                 field = struct_definition_get_field_from_index(file_stream->stream.trace_packet_header, len_index);
 849                                 assert(field->declaration->id == CTF_TYPE_ARRAY);
 850                                 defarray = container_of(field, struct definition_array, p);
 851                                 assert(array_len(defarray) == UUID_LEN);
 852                                 assert(defarray->declaration->elem->id == CTF_TYPE_INTEGER);
 853
 854                                 for (i = 0; i < UUID_LEN; i++) {
 855                                         struct definition *elem;
 856                                         struct definition_integer *defint;
 857
 858                                         elem = array_index(defarray, i);
 859                                         assert(elem);
 860                                         defint = container_of(elem, struct definition_integer, p);
 861                                         uuidval[i] = defint->value._unsigned;
 862                                 }
 863                                 ret = uuid_compare(td->uuid, uuidval);
 864                                 if (ret) {
 865                                         fprintf(stdout, "[error] Unique Universal Identifiers do not match.\n");
 866                                         return -EINVAL;
 867                                 }
 868                         }
 869
 870
 871                         len_index = struct_declaration_lookup_field_index(file_stream->stream.trace_packet_header->declaration, g_quark_from_static_string("stream_id"));
 872                         if (len_index >= 0) {
 873                                 struct definition_integer *defint;
 874                                 struct definition *field;
 875
 876                                 field = struct_definition_get_field_from_index(file_stream->stream.trace_packet_header, len_index);
 877                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 878                                 defint = container_of(field, struct definition_integer, p);
 879                                 assert(defint->declaration->signedness == FALSE);
 880                                 stream_id = defint->value._unsigned;
 881                         }
 882                 }
 883
 884                 if (!first_packet && file_stream->stream_id != stream_id) {
 885                         fprintf(stdout, "[error] Stream ID is changing within a stream.\n");
 886                         return -EINVAL;
 887                 }
 888                 if (first_packet) {
 889                         file_stream->stream_id = stream_id;
 890                         if (stream_id >= td->streams->len) {
 891                                 fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
 892                                 return -EINVAL;
 893                         }
 894                         stream = g_ptr_array_index(td->streams, stream_id);
 895                         if (!stream) {
 896                                 fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
 897                                 return -EINVAL;
 898                         }
 899                         file_stream->stream.stream_class = stream;
 900                 }
 901                 first_packet = 0;
 902
 903                 ret = create_stream_definitions(td, &file_stream->stream);
 904                 if (ret)
 905                         return ret;
 906
 907                 if (file_stream->stream.stream_packet_context) {
 908                         /* Read packet context */
 909                         ret = generic_rw(&pos->parent, &file_stream->stream.stream_packet_context->p);
 910                         if (ret)
 911                                 return ret;
 912                         /* read content size from header */
 913                         len_index = struct_declaration_lookup_field_index(file_stream->stream.stream_packet_context->declaration, g_quark_from_static_string("content_size"));
 914                         if (len_index >= 0) {
 915                                 struct definition_integer *defint;
 916                                 struct definition *field;
 917
 918                                 field = struct_definition_get_field_from_index(file_stream->stream.stream_packet_context, len_index);
 919                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 920                                 defint = container_of(field, struct definition_integer, p);
 921                                 assert(defint->declaration->signedness == FALSE);
 922                                 packet_index.content_size = defint->value._unsigned;
 923                         } else {
 924                                 /* Use file size for packet size */
 925                                 packet_index.content_size = filestats.st_size * CHAR_BIT;
 926                         }
 927
 928                         /* read packet size from header */
 929                         len_index = struct_declaration_lookup_field_index(file_stream->stream.stream_packet_context->declaration, g_quark_from_static_string("packet_size"));
 930                         if (len_index >= 0) {
 931                                 struct definition_integer *defint;
 932                                 struct definition *field;
 933
 934                                 field = struct_definition_get_field_from_index(file_stream->stream.stream_packet_context, len_index);
 935                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 936                                 defint = container_of(field, struct definition_integer, p);
 937                                 assert(defint->declaration->signedness == FALSE);
 938                                 packet_index.packet_size = defint->value._unsigned;
 939                         } else {
 940                                 /* Use content size if non-zero, else file size */
 941                                 packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
 942                         }
 943
 944                         /* read timestamp begin from header */
 945                         len_index = struct_declaration_lookup_field_index(file_stream->stream.stream_packet_context->declaration, g_quark_from_static_string("timestamp_begin"));
 946                         if (len_index >= 0) {
 947                                 struct definition_integer *defint;
 948                                 struct definition *field;
 949
 950                                 field = struct_definition_get_field_from_index(file_stream->stream.stream_packet_context, len_index);
 951                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 952                                 defint = container_of(field, struct definition_integer, p);
 953                                 assert(defint->declaration->signedness == FALSE);
 954                                 packet_index.timestamp_begin = defint->value._unsigned;
 955                         }
 956
 957                         /* read timestamp end from header */
 958                         len_index = struct_declaration_lookup_field_index(file_stream->stream.stream_packet_context->declaration, g_quark_from_static_string("timestamp_end"));
 959                         if (len_index >= 0) {
 960                                 struct definition_integer *defint;
 961                                 struct definition *field;
 962
 963                                 field = struct_definition_get_field_from_index(file_stream->stream.stream_packet_context, len_index);
 964                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 965                                 defint = container_of(field, struct definition_integer, p);
 966                                 assert(defint->declaration->signedness == FALSE);
 967                                 packet_index.timestamp_end = defint->value._unsigned;
 968                         }
 969                 } else {
 970                         /* Use file size for packet size */
 971                         packet_index.content_size = filestats.st_size * CHAR_BIT;
 972                         /* Use content size if non-zero, else file size */
 973                         packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
 974                 }
 975
 976                 /* Validate content size and packet size values */
 977                 if (packet_index.content_size > packet_index.packet_size) {
 978                         fprintf(stdout, "[error] Content size (%zu bits) is larger than packet size (%zu bits).\n",
 979                                 packet_index.content_size, packet_index.packet_size);
 980                         return -EINVAL;
 981                 }
 982
 983                 if (packet_index.packet_size > (filestats.st_size - packet_index.offset) * CHAR_BIT) {
 984                         fprintf(stdout, "[error] Packet size (%zu bits) is larger than remaining file size (%zu bits).\n",
 985                                 packet_index.content_size, (filestats.st_size - packet_index.offset) * CHAR_BIT);
 986                         return -EINVAL;
 987                 }
 988
 989                 /* Save position after header and context */
 990                 packet_index.data_offset = pos->offset;
 991
 992                 /* add index to packet array */
 993                 g_array_append_val(file_stream->pos.packet_index, packet_index);
 994
 995                 pos->mmap_offset += packet_index.packet_size / CHAR_BIT;
 996         }
 997
 998         /* Move pos back to beginning of file */
 999         ctf_move_pos_slow(pos, 0, SEEK_SET);    /* position for write */
1000
1001         return 0;
1002 }
1003
1004 static
1005 int create_trace_definitions(struct ctf_trace *td, struct ctf_stream *stream)
1006 {
1007         int ret;
1008
1009         if (td->packet_header_decl) {
1010                 struct definition *definition =
1011                         td->packet_header_decl->p.definition_new(&td->packet_header_decl->p,
1012                                 stream->parent_def_scope, 0, 0, "trace.packet.header");
1013                 if (!definition) {
1014                         ret = -EINVAL;
1015                         goto error;
1016                 }
1017                 stream->trace_packet_header =
1018                         container_of(definition, struct definition_struct, p);
1019                 stream->parent_def_scope = stream->trace_packet_header->p.scope;
1020         }
1021
1022         return 0;
1023
1024 error:
1025         return ret;
1026 }
1027
1028 /*
1029  * Note: many file streams can inherit from the same stream class
1030  * description (metadata).
1031  */
1032 static
1033 int ctf_open_file_stream_read(struct ctf_trace *td, const char *path, int flags)
1034 {
1035         int ret;
1036         struct ctf_file_stream *file_stream;
1037
1038         ret = openat(td->dirfd, path, flags);
1039         if (ret < 0)
1040                 goto error;
1041         file_stream = g_new0(struct ctf_file_stream, 1);
1042         ctf_init_pos(&file_stream->pos, ret, flags);
1043         ret = create_trace_definitions(td, &file_stream->stream);
1044         if (ret)
1045                 goto error_def;
1046         ret = create_stream_packet_index(td, file_stream);
1047         if (ret)
1048                 goto error_index;
1049         /* Add stream file to stream class */
1050         g_ptr_array_add(file_stream->stream.stream_class->files, file_stream);
1051         return 0;
1052
1053 error_index:
1054         if (file_stream->stream.trace_packet_header)
1055                 definition_unref(&file_stream->stream.trace_packet_header->p);
1056 error_def:
1057         ctf_fini_pos(&file_stream->pos);
1058         close(file_stream->pos.fd);
1059         g_free(file_stream);
1060 error:
1061         return ret;
1062 }
1063
1064 static
1065 int ctf_open_trace_read(struct ctf_trace *td, const char *path, int flags)
1066 {
1067         int ret;
1068         struct dirent *dirent;
1069         struct dirent *diriter;
1070         size_t dirent_len;
1071
1072         td->flags = flags;
1073
1074         /* Open trace directory */
1075         td->dir = opendir(path);
1076         if (!td->dir) {
1077                 fprintf(stdout, "[error] Unable to open trace directory.\n");
1078                 ret = -ENOENT;
1079                 goto error;
1080         }
1081
1082         td->dirfd = open(path, 0);
1083         if (td->dirfd < 0) {
1084                 fprintf(stdout, "[error] Unable to open trace directory file descriptor.\n");
1085                 ret = -ENOENT;
1086                 goto error_dirfd;
1087         }
1088
1089         /*
1090          * Keep the metadata file separate.
1091          */
1092
1093         ret = ctf_open_trace_metadata_read(td);
1094         if (ret) {
1095                 goto error_metadata;
1096         }
1097
1098         /*
1099          * Open each stream: for each file, try to open, check magic
1100          * number, and get the stream ID to add to the right location in
1101          * the stream array.
1102          */
1103
1104         dirent_len = offsetof(struct dirent, d_name) +
1105                         fpathconf(td->dirfd, _PC_NAME_MAX) + 1;
1106
1107         dirent = malloc(dirent_len);
1108
1109         for (;;) {
1110                 ret = readdir_r(td->dir, dirent, &diriter);
1111                 if (ret) {
1112                         fprintf(stdout, "[error] Readdir error.\n");
1113                         goto readdir_error;
1114                 }
1115                 if (!diriter)
1116                         break;
1117                 /* Ignore hidden files, ., .. and metadata. */
1118                 if (!strncmp(diriter->d_name, ".", 1)
1119                                 || !strcmp(diriter->d_name, "..")
1120                                 || !strcmp(diriter->d_name, "metadata"))
1121                         continue;
1122                 ret = ctf_open_file_stream_read(td, diriter->d_name, flags);
1123                 if (ret) {
1124                         fprintf(stdout, "[error] Open file stream error.\n");
1125                         goto readdir_error;
1126                 }
1127         }
1128
1129         free(dirent);
1130         return 0;
1131
1132 readdir_error:
1133         free(dirent);
1134 error_metadata:
1135         close(td->dirfd);
1136 error_dirfd:
1137         closedir(td->dir);
1138 error:
1139         return ret;
1140 }
1141
1142 static
1143 struct trace_descriptor *ctf_open_trace(const char *path, int flags)
1144 {
1145         struct ctf_trace *td;
1146         int ret;
1147
1148         td = g_new0(struct ctf_trace, 1);
1149
1150         switch (flags & O_ACCMODE) {
1151         case O_RDONLY:
1152                 if (!path) {
1153                         fprintf(stdout, "[error] Path missing for input CTF trace.\n");
1154                         goto error;
1155                 }
1156                 ret = ctf_open_trace_read(td, path, flags);
1157                 if (ret)
1158                         goto error;
1159                 break;
1160         case O_RDWR:
1161                 fprintf(stdout, "[error] Opening CTF traces for output is not supported yet.\n");
1162                 goto error;
1163         default:
1164                 fprintf(stdout, "[error] Incorrect open flags.\n");
1165                 goto error;
1166         }
1167
1168         return &td->parent;
1169 error:
1170         g_free(td);
1171         return NULL;
1172 }
1173
1174 static
1175 void ctf_close_file_stream(struct ctf_file_stream *file_stream)
1176 {
1177         ctf_fini_pos(&file_stream->pos);
1178         close(file_stream->pos.fd);
1179 }
1180
1181 static
1182 void ctf_close_trace(struct trace_descriptor *tdp)
1183 {
1184         struct ctf_trace *td = container_of(tdp, struct ctf_trace, parent);
1185         int i;
1186
1187         if (td->streams) {
1188                 for (i = 0; i < td->streams->len; i++) {
1189                         struct ctf_stream_class *stream;
1190                         int j;
1191
1192                         stream = g_ptr_array_index(td->streams, i);
1193                         if (!stream)
1194                                 continue;
1195                         for (j = 0; j < stream->files->len; j++) {
1196                                 struct ctf_file_stream *file_stream;
1197                                 file_stream = g_ptr_array_index(stream->files, j);
1198                                 ctf_close_file_stream(file_stream);
1199                         }
1200
1201                 }
1202                 g_ptr_array_free(td->streams, TRUE);
1203         }
1204         closedir(td->dir);
1205         g_free(td);
1206 }
1207
1208 void __attribute__((constructor)) ctf_init(void)
1209 {
1210         int ret;
1211
1212         ctf_format.name = g_quark_from_static_string("ctf");
1213         ret = bt_register_format(&ctf_format);
1214         assert(!ret);
1215 }
1216
1217 /* TODO: finalize */