formats/ctf/ctf.c

   1 /*
   2  * BabelTrace - Common Trace Format (CTF)
   3  *
   4  * Format registration.
   5  *
   6  * Copyright 2010-2011 EfficiOS Inc. and Linux Foundation
   7  *
   8  * Author: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   9  *
  10  * Permission is hereby granted, free of charge, to any person obtaining a copy
  11  * of this software and associated documentation files (the "Software"), to deal
  12  * in the Software without restriction, including without limitation the rights
  13  * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  14  * copies of the Software, and to permit persons to whom the Software is
  15  * furnished to do so, subject to the following conditions:
  16  *
  17  * The above copyright notice and this permission notice shall be included in
  18  * all copies or substantial portions of the Software.
  19  */
  20
  21 #include <babeltrace/format.h>
  22 #include <babeltrace/ctf/types.h>
  23 #include <babeltrace/ctf/metadata.h>
  24 #include <babeltrace/babeltrace.h>
  25 #include <inttypes.h>
  26 #include <stdio.h>
  27 #include <uuid/uuid.h>
  28 #include <sys/mman.h>
  29 #include <errno.h>
  30 #include <endian.h>
  31 #include <sys/types.h>
  32 #include <sys/stat.h>
  33 #include <fcntl.h>
  34 #include <dirent.h>
  35 #include <glib.h>
  36 #include <unistd.h>
  37 #include <stdlib.h>
  38
  39 #include "metadata/ctf-scanner.h"
  40 #include "metadata/ctf-parser.h"
  41 #include "metadata/ctf-ast.h"
  42
  43 /*
  44  * We currently simply map a page to read the packet header and packet
  45  * context to get the packet length and content length. (in bits)
  46  */
  47 #define MAX_PACKET_HEADER_LEN   (getpagesize() * CHAR_BIT)
  48 #define WRITE_PACKET_LEN        (getpagesize() * 8 * CHAR_BIT)
  49 #define UUID_LEN 16     /* uuid by value len */
  50
  51 #ifndef min
  52 #define min(a, b)       (((a) < (b)) ? (a) : (b))
  53 #endif
  54
  55 extern int yydebug;
  56
  57 static
  58 struct trace_descriptor *ctf_open_trace(const char *path, int flags);
  59 static
  60 void ctf_close_trace(struct trace_descriptor *descriptor);
  61
  62 static
  63 rw_dispatch read_dispatch_table[] = {
  64         [ CTF_TYPE_INTEGER ] = ctf_integer_read,
  65         [ CTF_TYPE_FLOAT ] = ctf_float_read,
  66         [ CTF_TYPE_ENUM ] = ctf_enum_read,
  67         [ CTF_TYPE_STRING ] = ctf_string_read,
  68         [ CTF_TYPE_STRUCT ] = ctf_struct_rw,
  69         [ CTF_TYPE_VARIANT ] = ctf_variant_rw,
  70         [ CTF_TYPE_ARRAY ] = ctf_array_read,
  71         [ CTF_TYPE_SEQUENCE ] = ctf_sequence_read,
  72 };
  73
  74 static
  75 rw_dispatch write_dispatch_table[] = {
  76         [ CTF_TYPE_INTEGER ] = ctf_integer_write,
  77         [ CTF_TYPE_FLOAT ] = ctf_float_write,
  78         [ CTF_TYPE_ENUM ] = ctf_enum_write,
  79         [ CTF_TYPE_STRING ] = ctf_string_write,
  80         [ CTF_TYPE_STRUCT ] = ctf_struct_rw,
  81         [ CTF_TYPE_VARIANT ] = ctf_variant_rw,
  82         [ CTF_TYPE_ARRAY ] = ctf_array_write,
  83         [ CTF_TYPE_SEQUENCE ] = ctf_sequence_write,
  84 };
  85
  86 static
  87 struct format ctf_format = {
  88         .open_trace = ctf_open_trace,
  89         .close_trace = ctf_close_trace,
  90 };
  91
  92 static
  93 void ctf_update_timestamp(struct ctf_stream *stream,
  94                           struct definition_integer *integer_definition)
  95 {
  96         struct declaration_integer *integer_declaration =
  97                 integer_definition->declaration;
  98         uint64_t oldval, newval, updateval;
  99
 100         if (integer_declaration->len == 64) {
 101                 stream->timestamp = integer_definition->value._unsigned;
 102                 return;
 103         }
 104         /* keep low bits */
 105         oldval = stream->timestamp;
 106         oldval &= (1ULL << integer_declaration->len) - 1;
 107         newval = integer_definition->value._unsigned;
 108         /* Test for overflow by comparing low bits */
 109         if (newval < oldval)
 110                 newval += 1ULL << integer_declaration->len;
 111         /* updateval contains old high bits, and new low bits (sum) */
 112         updateval = stream->timestamp;
 113         updateval &= ~((1ULL << integer_declaration->len) - 1);
 114         updateval += newval;
 115         stream->timestamp = updateval;
 116 }
 117
 118 static
 119 int ctf_read_event(struct stream_pos *ppos, struct ctf_stream *stream)
 120 {
 121         struct ctf_stream_pos *pos =
 122                 container_of(ppos, struct ctf_stream_pos, parent);
 123         struct ctf_stream_class *stream_class = stream->stream_class;
 124         struct ctf_stream_event *event;
 125         uint64_t id = 0;
 126         int ret;
 127
 128         if (pos->offset == EOF)
 129                 return EOF;
 130
 131         /* Read event header */
 132         if (stream->stream_event_header) {
 133                 struct definition_integer *integer_definition;
 134                 struct definition *variant;
 135
 136                 ret = generic_rw(ppos, &stream->stream_event_header->p);
 137                 if (ret)
 138                         goto error;
 139                 /* lookup event id */
 140                 integer_definition = lookup_integer(&stream->stream_event_header->p, "id", FALSE);
 141                 if (integer_definition) {
 142                         id = integer_definition->value._unsigned;
 143                 } else {
 144                         struct definition_enum *enum_definition;
 145
 146                         enum_definition = lookup_enum(&stream->stream_event_header->p, "id", FALSE);
 147                         if (enum_definition) {
 148                                 id = enum_definition->integer->value._unsigned;
 149                         }
 150                 }
 151
 152                 variant = lookup_variant(&stream->stream_event_header->p, "v");
 153                 if (variant) {
 154                         integer_definition = lookup_integer(variant, "id", FALSE);
 155                         if (integer_definition) {
 156                                 id = integer_definition->value._unsigned;
 157                         }
 158                 }
 159
 160                 /* lookup timestamp */
 161                 stream->has_timestamp = 0;
 162                 integer_definition = lookup_integer(&stream->stream_event_header->p, "timestamp", FALSE);
 163                 if (integer_definition) {
 164                         ctf_update_timestamp(stream, integer_definition);
 165                         stream->has_timestamp = 1;
 166                 } else {
 167                         if (variant) {
 168                                 integer_definition = lookup_integer(variant, "timestamp", FALSE);
 169                                 if (integer_definition) {
 170                                         ctf_update_timestamp(stream, integer_definition);
 171                                         stream->has_timestamp = 1;
 172                                 }
 173                         }
 174                 }
 175         }
 176
 177         /* Read stream-declared event context */
 178         if (stream->stream_event_context) {
 179                 ret = generic_rw(ppos, &stream->stream_event_context->p);
 180                 if (ret)
 181                         goto error;
 182         }
 183
 184         if (id >= stream_class->events_by_id->len) {
 185                 fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
 186                 return -EINVAL;
 187         }
 188         event = g_ptr_array_index(stream->events_by_id, id);
 189         if (!event) {
 190                 fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
 191                 return -EINVAL;
 192         }
 193
 194         /* Read event-declared event context */
 195         if (event->event_context) {
 196                 ret = generic_rw(ppos, &event->event_context->p);
 197                 if (ret)
 198                         goto error;
 199         }
 200
 201         /* Read event payload */
 202         if (event->event_fields) {
 203                 ret = generic_rw(ppos, &event->event_fields->p);
 204                 if (ret)
 205                         goto error;
 206         }
 207
 208         return 0;
 209
 210 error:
 211         fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
 212         return ret;
 213 }
 214
 215 static
 216 int ctf_write_event(struct stream_pos *pos, struct ctf_stream *stream)
 217 {
 218         struct ctf_stream_class *stream_class = stream->stream_class;
 219         struct ctf_stream_event *event;
 220         uint64_t id = 0;
 221         int ret;
 222
 223         /* print event header */
 224         if (stream->stream_event_header) {
 225                 struct definition_integer *integer_definition;
 226                 struct definition *variant;
 227
 228                 /* lookup event id */
 229                 integer_definition = lookup_integer(&stream->stream_event_header->p, "id", FALSE);
 230                 if (integer_definition) {
 231                         id = integer_definition->value._unsigned;
 232                 } else {
 233                         struct definition_enum *enum_definition;
 234
 235                         enum_definition = lookup_enum(&stream->stream_event_header->p, "id", FALSE);
 236                         if (enum_definition) {
 237                                 id = enum_definition->integer->value._unsigned;
 238                         }
 239                 }
 240
 241                 variant = lookup_variant(&stream->stream_event_header->p, "v");
 242                 if (variant) {
 243                         integer_definition = lookup_integer(variant, "id", FALSE);
 244                         if (integer_definition) {
 245                                 id = integer_definition->value._unsigned;
 246                         }
 247                 }
 248
 249                 ret = generic_rw(pos, &stream->stream_event_header->p);
 250                 if (ret)
 251                         goto error;
 252         }
 253
 254         /* print stream-declared event context */
 255         if (stream->stream_event_context) {
 256                 ret = generic_rw(pos, &stream->stream_event_context->p);
 257                 if (ret)
 258                         goto error;
 259         }
 260
 261         if (id >= stream_class->events_by_id->len) {
 262                 fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
 263                 return -EINVAL;
 264         }
 265         event = g_ptr_array_index(stream->events_by_id, id);
 266         if (!event) {
 267                 fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
 268                 return -EINVAL;
 269         }
 270
 271         /* print event-declared event context */
 272         if (event->event_context) {
 273                 ret = generic_rw(pos, &event->event_context->p);
 274                 if (ret)
 275                         goto error;
 276         }
 277
 278         /* Read and print event payload */
 279         if (event->event_fields) {
 280                 ret = generic_rw(pos, &event->event_fields->p);
 281                 if (ret)
 282                         goto error;
 283         }
 284
 285         return 0;
 286
 287 error:
 288         fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
 289         return ret;
 290 }
 291
 292 void ctf_init_pos(struct ctf_stream_pos *pos, int fd, int open_flags)
 293 {
 294         pos->fd = fd;
 295         pos->mmap_offset = 0;
 296         pos->packet_size = 0;
 297         pos->content_size = 0;
 298         pos->content_size_loc = NULL;
 299         pos->base = NULL;
 300         pos->offset = 0;
 301         pos->dummy = false;
 302         pos->cur_index = 0;
 303         if (fd >= 0)
 304                 pos->packet_index = g_array_new(FALSE, TRUE,
 305                                                 sizeof(struct packet_index));
 306         else
 307                 pos->packet_index = NULL;
 308         switch (open_flags & O_ACCMODE) {
 309         case O_RDONLY:
 310                 pos->prot = PROT_READ;
 311                 pos->flags = MAP_PRIVATE;
 312                 pos->parent.rw_table = read_dispatch_table;
 313                 pos->parent.event_cb = ctf_read_event;
 314                 break;
 315         case O_RDWR:
 316                 pos->prot = PROT_WRITE; /* Write has priority */
 317                 pos->flags = MAP_SHARED;
 318                 pos->parent.rw_table = write_dispatch_table;
 319                 pos->parent.event_cb = ctf_write_event;
 320                 if (fd >= 0)
 321                         ctf_move_pos_slow(pos, 0, SEEK_SET);    /* position for write */
 322                 break;
 323         default:
 324                 assert(0);
 325         }
 326 }
 327
 328 void ctf_fini_pos(struct ctf_stream_pos *pos)
 329 {
 330         int ret;
 331
 332         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 333                 *pos->content_size_loc = pos->offset;
 334         if (pos->base) {
 335                 /* unmap old base */
 336                 ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 337                 if (ret) {
 338                         fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 339                                 strerror(errno));
 340                         assert(0);
 341                 }
 342         }
 343         (void) g_array_free(pos->packet_index, TRUE);
 344 }
 345
 346 void ctf_move_pos_slow(struct ctf_stream_pos *pos, size_t offset, int whence)
 347 {
 348         struct ctf_file_stream *file_stream =
 349                 container_of(pos, struct ctf_file_stream, pos);
 350         int ret;
 351         off_t off;
 352         struct packet_index *index;
 353
 354         if (pos->prot == PROT_WRITE && pos->content_size_loc)
 355                 *pos->content_size_loc = pos->offset;
 356
 357         if (pos->base) {
 358                 /* unmap old base */
 359                 ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 360                 if (ret) {
 361                         fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 362                                 strerror(errno));
 363                         assert(0);
 364                 }
 365                 pos->base = NULL;
 366         }
 367
 368         /*
 369          * The caller should never ask for ctf_move_pos across packets,
 370          * except to get exactly at the beginning of the next packet.
 371          */
 372         if (pos->prot == PROT_WRITE) {
 373                 switch (whence) {
 374                 case SEEK_CUR:
 375                         /* The writer will add padding */
 376                         assert(pos->offset + offset == pos->packet_size);
 377                         pos->mmap_offset += WRITE_PACKET_LEN / CHAR_BIT;
 378                         break;
 379                 case SEEK_SET:
 380                         assert(offset == 0);    /* only seek supported for now */
 381                         pos->cur_index = 0;
 382                         break;
 383                 default:
 384                         assert(0);
 385                 }
 386                 pos->content_size = -1U;        /* Unknown at this point */
 387                 pos->packet_size = WRITE_PACKET_LEN;
 388                 off = posix_fallocate(pos->fd, pos->mmap_offset,
 389                                       pos->packet_size / CHAR_BIT);
 390                 assert(off >= 0);
 391                 pos->offset = 0;
 392         } else {
 393                 switch (whence) {
 394                 case SEEK_CUR:
 395                         /* The reader will expect us to skip padding */
 396                         assert(pos->offset + offset == pos->content_size);
 397                         ++pos->cur_index;
 398                         break;
 399                 case SEEK_SET:
 400                         assert(offset == 0);    /* only seek supported for now */
 401                         pos->cur_index = 0;
 402                         break;
 403                 default:
 404                         assert(0);
 405                 }
 406                 if (pos->cur_index >= pos->packet_index->len) {
 407                         pos->offset = EOF;
 408                         return;
 409                 }
 410                 index = &g_array_index(pos->packet_index, struct packet_index,
 411                                        pos->cur_index);
 412                 pos->mmap_offset = index->offset;
 413
 414                 /* Lookup context/packet size in index */
 415                 file_stream->parent.timestamp = index->timestamp_begin;
 416                 pos->content_size = index->content_size;
 417                 pos->packet_size = index->packet_size;
 418                 if (index->data_offset < index->content_size)
 419                         pos->offset = 0;        /* will read headers */
 420                 else {
 421                         pos->offset = EOF;
 422                         return;
 423                 }
 424         }
 425         /* map new base. Need mapping length from header. */
 426         pos->base = mmap(NULL, pos->packet_size / CHAR_BIT, pos->prot,
 427                          pos->flags, pos->fd, pos->mmap_offset);
 428         if (pos->base == MAP_FAILED) {
 429                 fprintf(stdout, "[error] mmap error %s.\n",
 430                         strerror(errno));
 431                 assert(0);
 432         }
 433
 434         /* update trace_packet_header and stream_packet_context */
 435         if (pos->prot != PROT_WRITE && file_stream->parent.trace_packet_header) {
 436                 /* Read packet header */
 437                 ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
 438                 assert(!ret);
 439         }
 440         if (pos->prot != PROT_WRITE && file_stream->parent.stream_packet_context) {
 441                 /* Read packet context */
 442                 ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
 443                 assert(!ret);
 444         }
 445 }
 446
 447 static
 448 int packet_metadata(struct ctf_trace *td, FILE *fp)
 449 {
 450         uint32_t magic;
 451         size_t len;
 452         int ret = 0;
 453
 454         len = fread(&magic, sizeof(magic), 1, fp);
 455         if (len != 1) {
 456                 goto end;
 457         }
 458         if (magic == TSDL_MAGIC) {
 459                 ret = 1;
 460                 td->byte_order = BYTE_ORDER;
 461         } else if (magic == GUINT32_SWAP_LE_BE(TSDL_MAGIC)) {
 462                 ret = 1;
 463                 td->byte_order = (BYTE_ORDER == BIG_ENDIAN) ?
 464                                         LITTLE_ENDIAN : BIG_ENDIAN;
 465         }
 466         CTF_TRACE_SET_FIELD(td, byte_order);
 467 end:
 468         rewind(fp);
 469         return ret;
 470 }
 471
 472 static
 473 int ctf_open_trace_metadata_packet_read(struct ctf_trace *td, FILE *in,
 474                                         FILE *out)
 475 {
 476         struct metadata_packet_header header;
 477         size_t readlen, writelen, toread;
 478         char buf[4096 + 1];     /* + 1 for debug-mode \0 */
 479         int ret = 0;
 480
 481         readlen = fread(&header, header_sizeof(header), 1, in);
 482         if (readlen < 1)
 483                 return -EINVAL;
 484
 485         if (td->byte_order != BYTE_ORDER) {
 486                 header.magic = GUINT32_SWAP_LE_BE(header.magic);
 487                 header.checksum = GUINT32_SWAP_LE_BE(header.checksum);
 488                 header.content_size = GUINT32_SWAP_LE_BE(header.content_size);
 489                 header.packet_size = GUINT32_SWAP_LE_BE(header.packet_size);
 490         }
 491         if (header.checksum)
 492                 fprintf(stdout, "[warning] checksum verification not supported yet.\n");
 493         if (header.compression_scheme) {
 494                 fprintf(stdout, "[error] compression (%u) not supported yet.\n",
 495                         header.compression_scheme);
 496                 return -EINVAL;
 497         }
 498         if (header.encryption_scheme) {
 499                 fprintf(stdout, "[error] encryption (%u) not supported yet.\n",
 500                         header.encryption_scheme);
 501                 return -EINVAL;
 502         }
 503         if (header.checksum_scheme) {
 504                 fprintf(stdout, "[error] checksum (%u) not supported yet.\n",
 505                         header.checksum_scheme);
 506                 return -EINVAL;
 507         }
 508         if (!CTF_TRACE_FIELD_IS_SET(td, uuid)) {
 509                 memcpy(td->uuid, header.uuid, sizeof(header.uuid));
 510                 CTF_TRACE_SET_FIELD(td, uuid);
 511         } else {
 512                 if (uuid_compare(header.uuid, td->uuid))
 513                         return -EINVAL;
 514         }
 515
 516         toread = (header.content_size / CHAR_BIT) - header_sizeof(header);
 517
 518         for (;;) {
 519                 readlen = fread(buf, sizeof(char), min(sizeof(buf) - 1, toread), in);
 520                 if (ferror(in)) {
 521                         ret = -EINVAL;
 522                         break;
 523                 }
 524                 if (babeltrace_debug) {
 525                         buf[readlen] = '\0';
 526                         fprintf(stdout, "[debug] metadata packet read: %s\n",
 527                                 buf);
 528                 }
 529
 530                 writelen = fwrite(buf, sizeof(char), readlen, out);
 531                 if (writelen < readlen) {
 532                         ret = -EIO;
 533                         break;
 534                 }
 535                 if (ferror(out)) {
 536                         ret = -EINVAL;
 537                         break;
 538                 }
 539                 toread -= readlen;
 540                 if (!toread) {
 541                         ret = 0;        /* continue reading next packet */
 542                         break;
 543                 }
 544         }
 545         return ret;
 546 }
 547
 548 static
 549 int ctf_open_trace_metadata_stream_read(struct ctf_trace *td, FILE **fp,
 550                                         char **buf)
 551 {
 552         FILE *in, *out;
 553         size_t size;
 554         int ret;
 555
 556         in = *fp;
 557         /*
 558          * Using strlen on *buf instead of size of open_memstream
 559          * because its size includes garbage at the end (after final
 560          * \0). This is the allocated size, not the actual string size.
 561          */
 562         out = open_memstream(buf, &size);
 563         if (out == NULL)
 564                 return -errno;
 565
 566         for (;;) {
 567                 ret = ctf_open_trace_metadata_packet_read(td, in, out);
 568                 if (ret) {
 569                         break;
 570                 }
 571                 if (feof(in)) {
 572                         ret = 0;
 573                         break;
 574                 }
 575         }
 576         fclose(out);    /* flush the buffer */
 577         fclose(in);
 578         /* open for reading */
 579         *fp = fmemopen(*buf, strlen(*buf), "rb");
 580         return 0;
 581 }
 582
 583 static
 584 int ctf_open_trace_metadata_read(struct ctf_trace *td)
 585 {
 586         struct ctf_scanner *scanner;
 587         struct ctf_file_stream *metadata_stream;
 588         FILE *fp;
 589         char *buf = NULL;
 590         int ret = 0;
 591
 592         metadata_stream = g_new0(struct ctf_file_stream, 1);
 593         td->metadata = &metadata_stream->parent;
 594         metadata_stream->pos.fd = openat(td->dirfd, "metadata", O_RDONLY);
 595         if (metadata_stream->pos.fd < 0) {
 596                 fprintf(stdout, "Unable to open metadata.\n");
 597                 return metadata_stream->pos.fd;
 598         }
 599
 600         if (babeltrace_debug)
 601                 yydebug = 1;
 602
 603         fp = fdopen(metadata_stream->pos.fd, "r");
 604         if (!fp) {
 605                 fprintf(stdout, "[error] Unable to open metadata stream.\n");
 606                 ret = -errno;
 607                 goto end_stream;
 608         }
 609
 610         if (packet_metadata(td, fp)) {
 611                 ret = ctf_open_trace_metadata_stream_read(td, &fp, &buf);
 612                 if (ret)
 613                         goto end_packet_read;
 614         }
 615
 616         scanner = ctf_scanner_alloc(fp);
 617         if (!scanner) {
 618                 fprintf(stdout, "[error] Error allocating scanner\n");
 619                 ret = -ENOMEM;
 620                 goto end_scanner_alloc;
 621         }
 622         ret = ctf_scanner_append_ast(scanner);
 623         if (ret) {
 624                 fprintf(stdout, "[error] Error creating AST\n");
 625                 goto end;
 626         }
 627
 628         if (babeltrace_debug) {
 629                 ret = ctf_visitor_print_xml(stdout, 0, &scanner->ast->root);
 630                 if (ret) {
 631                         fprintf(stdout, "[error] Error visiting AST for XML output\n");
 632                         goto end;
 633                 }
 634         }
 635
 636         ret = ctf_visitor_semantic_check(stdout, 0, &scanner->ast->root);
 637         if (ret) {
 638                 fprintf(stdout, "[error] Error in CTF semantic validation %d\n", ret);
 639                 goto end;
 640         }
 641         ret = ctf_visitor_construct_metadata(stdout, 0, &scanner->ast->root,
 642                         td, BYTE_ORDER);
 643         if (ret) {
 644                 fprintf(stdout, "[error] Error in CTF metadata constructor %d\n", ret);
 645                 goto end;
 646         }
 647 end:
 648         ctf_scanner_free(scanner);
 649 end_scanner_alloc:
 650 end_packet_read:
 651         fclose(fp);
 652         free(buf);
 653 end_stream:
 654         close(metadata_stream->pos.fd);
 655         if (ret)
 656                 g_free(metadata_stream);
 657         return ret;
 658 }
 659
 660 static
 661 struct ctf_stream_event *create_event_definitions(struct ctf_trace *td,
 662                                                   struct ctf_stream *stream,
 663                                                   struct ctf_event *event)
 664 {
 665         struct ctf_stream_event *stream_event = g_new0(struct ctf_stream_event, 1);
 666
 667         if (event->context_decl) {
 668                 struct definition *definition =
 669                         event->context_decl->p.definition_new(&event->context_decl->p,
 670                                 stream->parent_def_scope, 0, 0, "event.context");
 671                 if (!definition) {
 672                         goto error;
 673                 }
 674                 stream_event->event_context = container_of(definition,
 675                                         struct definition_struct, p);
 676                 stream->parent_def_scope = stream_event->event_context->p.scope;
 677         }
 678         if (event->fields_decl) {
 679                 struct definition *definition =
 680                         event->fields_decl->p.definition_new(&event->fields_decl->p,
 681                                 stream->parent_def_scope, 0, 0, "event.fields");
 682                 if (!definition) {
 683                         goto error;
 684                 }
 685                 stream_event->event_fields = container_of(definition,
 686                                         struct definition_struct, p);
 687                 stream->parent_def_scope = stream_event->event_fields->p.scope;
 688         }
 689         return stream_event;
 690
 691 error:
 692         if (stream_event->event_fields)
 693                 definition_unref(&stream_event->event_fields->p);
 694         if (stream_event->event_context)
 695                 definition_unref(&stream_event->event_context->p);
 696         return NULL;
 697 }
 698
 699 static
 700 int create_stream_definitions(struct ctf_trace *td, struct ctf_stream *stream)
 701 {
 702         struct ctf_stream_class *stream_class;
 703         int ret;
 704         int i;
 705
 706         if (stream->stream_definitions_created)
 707                 return 0;
 708
 709         stream_class = stream->stream_class;
 710
 711         if (stream_class->packet_context_decl) {
 712                 struct definition *definition =
 713                         stream_class->packet_context_decl->p.definition_new(&stream_class->packet_context_decl->p,
 714                                 stream->parent_def_scope, 0, 0, "stream.packet.context");
 715                 if (!definition) {
 716                         ret = -EINVAL;
 717                         goto error;
 718                 }
 719                 stream->stream_packet_context = container_of(definition,
 720                                                 struct definition_struct, p);
 721                 stream->parent_def_scope = stream->stream_packet_context->p.scope;
 722         }
 723         if (stream_class->event_header_decl) {
 724                 struct definition *definition =
 725                         stream_class->event_header_decl->p.definition_new(&stream_class->event_header_decl->p,
 726                                 stream->parent_def_scope, 0, 0, "stream.event.header");
 727                 if (!definition) {
 728                         ret = -EINVAL;
 729                         goto error;
 730                 }
 731                 stream->stream_event_header =
 732                         container_of(definition, struct definition_struct, p);
 733                 stream->parent_def_scope = stream->stream_event_header->p.scope;
 734         }
 735         if (stream_class->event_context_decl) {
 736                 struct definition *definition =
 737                         stream_class->event_context_decl->p.definition_new(&stream_class->event_context_decl->p,
 738                                 stream->parent_def_scope, 0, 0, "stream.event.context");
 739                 if (!definition) {
 740                         ret = -EINVAL;
 741                         goto error;
 742                 }
 743                 stream->stream_event_context =
 744                         container_of(definition, struct definition_struct, p);
 745                 stream->parent_def_scope = stream->stream_event_context->p.scope;
 746         }
 747         stream->events_by_id = g_ptr_array_new();
 748         g_ptr_array_set_size(stream->events_by_id, stream_class->events_by_id->len);
 749         for (i = 0; i < stream->events_by_id->len; i++) {
 750                 struct ctf_event *event = g_ptr_array_index(stream_class->events_by_id, i);
 751                 struct ctf_stream_event *stream_event;
 752
 753                 if (!event)
 754                         continue;
 755                 stream_event = create_event_definitions(td, stream, event);
 756                 if (!stream_event)
 757                         goto error_event;
 758                 g_ptr_array_index(stream->events_by_id, i) = stream_event;
 759         }
 760         return 0;
 761
 762 error_event:
 763         for (i = 0; i < stream->events_by_id->len; i++) {
 764                 struct ctf_stream_event *stream_event = g_ptr_array_index(stream->events_by_id, i);
 765                 if (stream_event)
 766                         g_free(stream_event);
 767         }
 768         g_ptr_array_free(stream->events_by_id, TRUE);
 769 error:
 770         if (stream->stream_event_context)
 771                 definition_unref(&stream->stream_event_context->p);
 772         if (stream->stream_event_header)
 773                 definition_unref(&stream->stream_event_header->p);
 774         if (stream->stream_packet_context)
 775                 definition_unref(&stream->stream_packet_context->p);
 776         return ret;
 777 }
 778
 779
 780 static
 781 int create_stream_packet_index(struct ctf_trace *td,
 782                                struct ctf_file_stream *file_stream)
 783 {
 784         struct ctf_stream_class *stream;
 785         int len_index;
 786         struct ctf_stream_pos *pos;
 787         struct stat filestats;
 788         struct packet_index packet_index;
 789         int first_packet = 1;
 790         int ret;
 791
 792         pos = &file_stream->pos;
 793
 794         ret = fstat(pos->fd, &filestats);
 795         if (ret < 0)
 796                 return ret;
 797
 798         if (filestats.st_size < MAX_PACKET_HEADER_LEN / CHAR_BIT)
 799                 return -EINVAL;
 800
 801         for (pos->mmap_offset = 0; pos->mmap_offset < filestats.st_size; ) {
 802                 uint64_t stream_id = 0;
 803
 804                 if (pos->base) {
 805                         /* unmap old base */
 806                         ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
 807                         if (ret) {
 808                                 fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
 809                                         strerror(errno));
 810                                 return ret;
 811                         }
 812                         pos->base = NULL;
 813                 }
 814                 /* map new base. Need mapping length from header. */
 815                 pos->base = mmap(NULL, MAX_PACKET_HEADER_LEN / CHAR_BIT, PROT_READ,
 816                                  MAP_PRIVATE, pos->fd, pos->mmap_offset);
 817                 pos->content_size = MAX_PACKET_HEADER_LEN;      /* Unknown at this point */
 818                 pos->packet_size = MAX_PACKET_HEADER_LEN;       /* Unknown at this point */
 819                 pos->offset = 0;        /* Position of the packet header */
 820
 821                 packet_index.offset = pos->mmap_offset;
 822                 packet_index.content_size = 0;
 823                 packet_index.packet_size = 0;
 824                 packet_index.timestamp_begin = 0;
 825                 packet_index.timestamp_end = 0;
 826
 827                 /* read and check header, set stream id (and check) */
 828                 if (file_stream->parent.trace_packet_header) {
 829                         /* Read packet header */
 830                         ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
 831                         if (ret)
 832                                 return ret;
 833                         len_index = struct_declaration_lookup_field_index(file_stream->parent.trace_packet_header->declaration, g_quark_from_static_string("magic"));
 834                         if (len_index >= 0) {
 835                                 struct definition_integer *defint;
 836                                 struct definition *field;
 837
 838                                 field = struct_definition_get_field_from_index(file_stream->parent.trace_packet_header, len_index);
 839                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 840                                 defint = container_of(field, struct definition_integer, p);
 841                                 assert(defint->declaration->signedness == FALSE);
 842                                 if (defint->value._unsigned != CTF_MAGIC) {
 843                                         fprintf(stdout, "[error] Invalid magic number 0x%" PRIX64 " at packet %u (file offset %zd).\n",
 844                                                         defint->value._unsigned,
 845                                                         file_stream->pos.packet_index->len,
 846                                                         (ssize_t) pos->mmap_offset);
 847                                         return -EINVAL;
 848                                 }
 849                         }
 850
 851                         /* check uuid */
 852                         len_index = struct_declaration_lookup_field_index(file_stream->parent.trace_packet_header->declaration, g_quark_from_static_string("uuid"));
 853                         if (len_index >= 0) {
 854                                 struct definition_array *defarray;
 855                                 struct definition *field;
 856                                 uint64_t i;
 857                                 uint8_t uuidval[UUID_LEN];
 858
 859                                 field = struct_definition_get_field_from_index(file_stream->parent.trace_packet_header, len_index);
 860                                 assert(field->declaration->id == CTF_TYPE_ARRAY);
 861                                 defarray = container_of(field, struct definition_array, p);
 862                                 assert(array_len(defarray) == UUID_LEN);
 863                                 assert(defarray->declaration->elem->id == CTF_TYPE_INTEGER);
 864
 865                                 for (i = 0; i < UUID_LEN; i++) {
 866                                         struct definition *elem;
 867                                         struct definition_integer *defint;
 868
 869                                         elem = array_index(defarray, i);
 870                                         assert(elem);
 871                                         defint = container_of(elem, struct definition_integer, p);
 872                                         uuidval[i] = defint->value._unsigned;
 873                                 }
 874                                 ret = uuid_compare(td->uuid, uuidval);
 875                                 if (ret) {
 876                                         fprintf(stdout, "[error] Unique Universal Identifiers do not match.\n");
 877                                         return -EINVAL;
 878                                 }
 879                         }
 880
 881
 882                         len_index = struct_declaration_lookup_field_index(file_stream->parent.trace_packet_header->declaration, g_quark_from_static_string("stream_id"));
 883                         if (len_index >= 0) {
 884                                 struct definition_integer *defint;
 885                                 struct definition *field;
 886
 887                                 field = struct_definition_get_field_from_index(file_stream->parent.trace_packet_header, len_index);
 888                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 889                                 defint = container_of(field, struct definition_integer, p);
 890                                 assert(defint->declaration->signedness == FALSE);
 891                                 stream_id = defint->value._unsigned;
 892                         }
 893                 }
 894
 895                 if (!first_packet && file_stream->parent.stream_id != stream_id) {
 896                         fprintf(stdout, "[error] Stream ID is changing within a stream.\n");
 897                         return -EINVAL;
 898                 }
 899                 if (first_packet) {
 900                         file_stream->parent.stream_id = stream_id;
 901                         if (stream_id >= td->streams->len) {
 902                                 fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
 903                                 return -EINVAL;
 904                         }
 905                         stream = g_ptr_array_index(td->streams, stream_id);
 906                         if (!stream) {
 907                                 fprintf(stdout, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
 908                                 return -EINVAL;
 909                         }
 910                         file_stream->parent.stream_class = stream;
 911                         ret = create_stream_definitions(td, &file_stream->parent);
 912                         if (ret)
 913                                 return ret;
 914                 }
 915                 first_packet = 0;
 916
 917                 if (file_stream->parent.stream_packet_context) {
 918                         /* Read packet context */
 919                         ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
 920                         if (ret)
 921                                 return ret;
 922                         /* read content size from header */
 923                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("content_size"));
 924                         if (len_index >= 0) {
 925                                 struct definition_integer *defint;
 926                                 struct definition *field;
 927
 928                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
 929                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 930                                 defint = container_of(field, struct definition_integer, p);
 931                                 assert(defint->declaration->signedness == FALSE);
 932                                 packet_index.content_size = defint->value._unsigned;
 933                         } else {
 934                                 /* Use file size for packet size */
 935                                 packet_index.content_size = filestats.st_size * CHAR_BIT;
 936                         }
 937
 938                         /* read packet size from header */
 939                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("packet_size"));
 940                         if (len_index >= 0) {
 941                                 struct definition_integer *defint;
 942                                 struct definition *field;
 943
 944                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
 945                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 946                                 defint = container_of(field, struct definition_integer, p);
 947                                 assert(defint->declaration->signedness == FALSE);
 948                                 packet_index.packet_size = defint->value._unsigned;
 949                         } else {
 950                                 /* Use content size if non-zero, else file size */
 951                                 packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
 952                         }
 953
 954                         /* read timestamp begin from header */
 955                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("timestamp_begin"));
 956                         if (len_index >= 0) {
 957                                 struct definition_integer *defint;
 958                                 struct definition *field;
 959
 960                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
 961                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 962                                 defint = container_of(field, struct definition_integer, p);
 963                                 assert(defint->declaration->signedness == FALSE);
 964                                 packet_index.timestamp_begin = defint->value._unsigned;
 965                         }
 966
 967                         /* read timestamp end from header */
 968                         len_index = struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("timestamp_end"));
 969                         if (len_index >= 0) {
 970                                 struct definition_integer *defint;
 971                                 struct definition *field;
 972
 973                                 field = struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
 974                                 assert(field->declaration->id == CTF_TYPE_INTEGER);
 975                                 defint = container_of(field, struct definition_integer, p);
 976                                 assert(defint->declaration->signedness == FALSE);
 977                                 packet_index.timestamp_end = defint->value._unsigned;
 978                         }
 979                 } else {
 980                         /* Use file size for packet size */
 981                         packet_index.content_size = filestats.st_size * CHAR_BIT;
 982                         /* Use content size if non-zero, else file size */
 983                         packet_index.packet_size = packet_index.content_size ? : filestats.st_size * CHAR_BIT;
 984                 }
 985
 986                 /* Validate content size and packet size values */
 987                 if (packet_index.content_size > packet_index.packet_size) {
 988                         fprintf(stdout, "[error] Content size (%zu bits) is larger than packet size (%zu bits).\n",
 989                                 packet_index.content_size, packet_index.packet_size);
 990                         return -EINVAL;
 991                 }
 992
 993                 if (packet_index.packet_size > (filestats.st_size - packet_index.offset) * CHAR_BIT) {
 994                         fprintf(stdout, "[error] Packet size (%zu bits) is larger than remaining file size (%zu bits).\n",
 995                                 packet_index.content_size, (size_t) (filestats.st_size - packet_index.offset) * CHAR_BIT);
 996                         return -EINVAL;
 997                 }
 998
 999                 /* Save position after header and context */
1000                 packet_index.data_offset = pos->offset;
1001
1002                 /* add index to packet array */
1003                 g_array_append_val(file_stream->pos.packet_index, packet_index);
1004
1005                 pos->mmap_offset += packet_index.packet_size / CHAR_BIT;
1006         }
1007
1008         /* Move pos back to beginning of file */
1009         ctf_move_pos_slow(pos, 0, SEEK_SET);    /* position for write */
1010
1011         return 0;
1012 }
1013
1014 static
1015 int create_trace_definitions(struct ctf_trace *td, struct ctf_stream *stream)
1016 {
1017         int ret;
1018
1019         if (td->packet_header_decl) {
1020                 struct definition *definition =
1021                         td->packet_header_decl->p.definition_new(&td->packet_header_decl->p,
1022                                 stream->parent_def_scope, 0, 0, "trace.packet.header");
1023                 if (!definition) {
1024                         ret = -EINVAL;
1025                         goto error;
1026                 }
1027                 stream->trace_packet_header =
1028                         container_of(definition, struct definition_struct, p);
1029                 stream->parent_def_scope = stream->trace_packet_header->p.scope;
1030         }
1031
1032         return 0;
1033
1034 error:
1035         return ret;
1036 }
1037
1038 /*
1039  * Note: many file streams can inherit from the same stream class
1040  * description (metadata).
1041  */
1042 static
1043 int ctf_open_file_stream_read(struct ctf_trace *td, const char *path, int flags)
1044 {
1045         int ret;
1046         struct ctf_file_stream *file_stream;
1047
1048         ret = openat(td->dirfd, path, flags);
1049         if (ret < 0)
1050                 goto error;
1051         file_stream = g_new0(struct ctf_file_stream, 1);
1052         ctf_init_pos(&file_stream->pos, ret, flags);
1053         ret = create_trace_definitions(td, &file_stream->parent);
1054         if (ret)
1055                 goto error_def;
1056         ret = create_stream_packet_index(td, file_stream);
1057         if (ret)
1058                 goto error_index;
1059         /* Add stream file to stream class */
1060         g_ptr_array_add(file_stream->parent.stream_class->streams,
1061                         &file_stream->parent);
1062         return 0;
1063
1064 error_index:
1065         if (file_stream->parent.trace_packet_header)
1066                 definition_unref(&file_stream->parent.trace_packet_header->p);
1067 error_def:
1068         ctf_fini_pos(&file_stream->pos);
1069         close(file_stream->pos.fd);
1070         g_free(file_stream);
1071 error:
1072         return ret;
1073 }
1074
1075 static
1076 int ctf_open_trace_read(struct ctf_trace *td, const char *path, int flags)
1077 {
1078         int ret;
1079         struct dirent *dirent;
1080         struct dirent *diriter;
1081         size_t dirent_len;
1082
1083         td->flags = flags;
1084
1085         /* Open trace directory */
1086         td->dir = opendir(path);
1087         if (!td->dir) {
1088                 fprintf(stdout, "[error] Unable to open trace directory.\n");
1089                 ret = -ENOENT;
1090                 goto error;
1091         }
1092
1093         td->dirfd = open(path, 0);
1094         if (td->dirfd < 0) {
1095                 fprintf(stdout, "[error] Unable to open trace directory file descriptor.\n");
1096                 ret = -ENOENT;
1097                 goto error_dirfd;
1098         }
1099
1100         /*
1101          * Keep the metadata file separate.
1102          */
1103
1104         ret = ctf_open_trace_metadata_read(td);
1105         if (ret) {
1106                 goto error_metadata;
1107         }
1108
1109         /*
1110          * Open each stream: for each file, try to open, check magic
1111          * number, and get the stream ID to add to the right location in
1112          * the stream array.
1113          */
1114
1115         dirent_len = offsetof(struct dirent, d_name) +
1116                         fpathconf(td->dirfd, _PC_NAME_MAX) + 1;
1117
1118         dirent = malloc(dirent_len);
1119
1120         for (;;) {
1121                 ret = readdir_r(td->dir, dirent, &diriter);
1122                 if (ret) {
1123                         fprintf(stdout, "[error] Readdir error.\n");
1124                         goto readdir_error;
1125                 }
1126                 if (!diriter)
1127                         break;
1128                 /* Ignore hidden files, ., .. and metadata. */
1129                 if (!strncmp(diriter->d_name, ".", 1)
1130                                 || !strcmp(diriter->d_name, "..")
1131                                 || !strcmp(diriter->d_name, "metadata"))
1132                         continue;
1133                 ret = ctf_open_file_stream_read(td, diriter->d_name, flags);
1134                 if (ret) {
1135                         fprintf(stdout, "[error] Open file stream error.\n");
1136                         goto readdir_error;
1137                 }
1138         }
1139
1140         free(dirent);
1141         return 0;
1142
1143 readdir_error:
1144         free(dirent);
1145 error_metadata:
1146         close(td->dirfd);
1147 error_dirfd:
1148         closedir(td->dir);
1149 error:
1150         return ret;
1151 }
1152
1153 static
1154 struct trace_descriptor *ctf_open_trace(const char *path, int flags)
1155 {
1156         struct ctf_trace *td;
1157         int ret;
1158
1159         td = g_new0(struct ctf_trace, 1);
1160
1161         switch (flags & O_ACCMODE) {
1162         case O_RDONLY:
1163                 if (!path) {
1164                         fprintf(stdout, "[error] Path missing for input CTF trace.\n");
1165                         goto error;
1166                 }
1167                 ret = ctf_open_trace_read(td, path, flags);
1168                 if (ret)
1169                         goto error;
1170                 break;
1171         case O_RDWR:
1172                 fprintf(stdout, "[error] Opening CTF traces for output is not supported yet.\n");
1173                 goto error;
1174         default:
1175                 fprintf(stdout, "[error] Incorrect open flags.\n");
1176                 goto error;
1177         }
1178
1179         return &td->parent;
1180 error:
1181         g_free(td);
1182         return NULL;
1183 }
1184
1185 static
1186 void ctf_close_file_stream(struct ctf_file_stream *file_stream)
1187 {
1188         ctf_fini_pos(&file_stream->pos);
1189         close(file_stream->pos.fd);
1190 }
1191
1192 static
1193 void ctf_close_trace(struct trace_descriptor *tdp)
1194 {
1195         struct ctf_trace *td = container_of(tdp, struct ctf_trace, parent);
1196         int i;
1197
1198         if (td->streams) {
1199                 for (i = 0; i < td->streams->len; i++) {
1200                         struct ctf_stream_class *stream;
1201                         int j;
1202
1203                         stream = g_ptr_array_index(td->streams, i);
1204                         if (!stream)
1205                                 continue;
1206                         for (j = 0; j < stream->streams->len; j++) {
1207                                 struct ctf_file_stream *file_stream;
1208                                 file_stream = container_of(g_ptr_array_index(stream->streams, j), struct ctf_file_stream, parent);
1209                                 ctf_close_file_stream(file_stream);
1210                         }
1211
1212                 }
1213                 g_ptr_array_free(td->streams, TRUE);
1214         }
1215         closedir(td->dir);
1216         g_free(td);
1217 }
1218
1219 void __attribute__((constructor)) ctf_init(void)
1220 {
1221         int ret;
1222
1223         ctf_format.name = g_quark_from_static_string("ctf");
1224         ret = bt_register_format(&ctf_format);
1225         assert(!ret);
1226 }
1227
1228 /* TODO: finalize */