+ pos->base_mma = NULL;
+ }
+
+ /*
+ * The caller should never ask for ctf_move_pos across packets,
+ * except to get exactly at the beginning of the next packet.
+ */
+ if (pos->prot == PROT_WRITE) {
+ switch (whence) {
+ case SEEK_CUR:
+ /* The writer will add padding */
+ pos->mmap_offset += WRITE_PACKET_LEN / CHAR_BIT;
+ break;
+ case SEEK_SET:
+ assert(index == 0); /* only seek supported for now */
+ pos->cur_index = 0;
+ break;
+ default:
+ assert(0);
+ }
+ pos->content_size = -1U; /* Unknown at this point */
+ pos->packet_size = WRITE_PACKET_LEN;
+ off = posix_fallocate(pos->fd, pos->mmap_offset,
+ pos->packet_size / CHAR_BIT);
+ assert(off >= 0);
+ pos->offset = 0;
+ } else {
+ read_next_packet:
+ switch (whence) {
+ case SEEK_CUR:
+ {
+ uint64_t events_discarded_diff;
+
+ if (pos->offset == EOF) {
+ return;
+ }
+ /* For printing discarded event count */
+ packet_index = &g_array_index(pos->packet_cycles_index,
+ struct packet_index, pos->cur_index);
+ file_stream->parent.prev_cycles_timestamp_end =
+ packet_index->timestamp_end;
+ file_stream->parent.prev_cycles_timestamp =
+ packet_index->timestamp_begin;
+
+ packet_index = &g_array_index(pos->packet_real_index,
+ struct packet_index, pos->cur_index);
+ file_stream->parent.prev_real_timestamp_end =
+ packet_index->timestamp_end;
+ file_stream->parent.prev_real_timestamp =
+ packet_index->timestamp_begin;
+
+ events_discarded_diff = packet_index->events_discarded;
+ if (pos->cur_index > 0) {
+ packet_index = &g_array_index(pos->packet_real_index,
+ struct packet_index,
+ pos->cur_index - 1);
+ events_discarded_diff -= packet_index->events_discarded;
+ /*
+ * Deal with 32-bit wrap-around if the
+ * tracer provided a 32-bit field.
+ */
+ if (packet_index->events_discarded_len == 32) {
+ events_discarded_diff = (uint32_t) events_discarded_diff;
+ }
+ }
+ file_stream->parent.events_discarded = events_discarded_diff;
+ file_stream->parent.prev_real_timestamp = file_stream->parent.real_timestamp;
+ file_stream->parent.prev_cycles_timestamp = file_stream->parent.cycles_timestamp;
+ /* The reader will expect us to skip padding */
+ ++pos->cur_index;
+ break;
+ }
+ case SEEK_SET:
+ packet_index = &g_array_index(pos->packet_cycles_index,
+ struct packet_index, index);
+ pos->last_events_discarded = packet_index->events_discarded;
+ pos->cur_index = index;
+ file_stream->parent.prev_real_timestamp = 0;
+ file_stream->parent.prev_real_timestamp_end = 0;
+ file_stream->parent.prev_cycles_timestamp = 0;
+ file_stream->parent.prev_cycles_timestamp_end = 0;
+ break;
+ default:
+ assert(0);
+ }
+ if (pos->cur_index >= pos->packet_real_index->len) {
+ /*
+ * We need to check if we are in trace read or
+ * called from packet indexing. In this last
+ * case, the collection is not there, so we
+ * cannot print the timestamps.
+ */
+ if ((&file_stream->parent)->stream_class->trace->parent.collection) {
+ /*
+ * When a stream reaches the end of the
+ * file, we need to show the number of
+ * events discarded ourselves, because
+ * there is no next event scheduled to
+ * be printed in the output.
+ */
+ if (file_stream->parent.events_discarded) {
+ fflush(stdout);
+ ctf_print_discarded(stderr,
+ &file_stream->parent,
+ 1);
+ file_stream->parent.events_discarded = 0;
+ }
+ }
+ pos->offset = EOF;
+ return;
+ }
+ packet_index = &g_array_index(pos->packet_cycles_index,
+ struct packet_index,
+ pos->cur_index);
+ file_stream->parent.cycles_timestamp = packet_index->timestamp_begin;
+
+ packet_index = &g_array_index(pos->packet_real_index,
+ struct packet_index,
+ pos->cur_index);
+ file_stream->parent.real_timestamp = packet_index->timestamp_begin;
+ pos->mmap_offset = packet_index->offset;
+
+ /* Lookup context/packet size in index */
+ pos->content_size = packet_index->content_size;
+ pos->packet_size = packet_index->packet_size;
+ if (packet_index->data_offset < packet_index->content_size) {
+ pos->offset = 0; /* will read headers */
+ } else if (packet_index->data_offset == packet_index->content_size) {
+ /* empty packet */
+ pos->offset = packet_index->data_offset;
+ whence = SEEK_CUR;
+ goto read_next_packet;
+ } else {
+ pos->offset = EOF;
+ return;
+ }
+ }
+ /* map new base. Need mapping length from header. */
+ pos->base_mma = mmap_align(pos->packet_size / CHAR_BIT, pos->prot,
+ pos->flags, pos->fd, pos->mmap_offset);
+ if (pos->base_mma == MAP_FAILED) {
+ fprintf(stderr, "[error] mmap error %s.\n",
+ strerror(errno));
+ assert(0);
+ }
+
+ /* update trace_packet_header and stream_packet_context */
+ if (pos->prot != PROT_WRITE && file_stream->parent.trace_packet_header) {
+ /* Read packet header */
+ ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
+ assert(!ret);
+ }
+ if (pos->prot != PROT_WRITE && file_stream->parent.stream_packet_context) {
+ /* Read packet context */
+ ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
+ assert(!ret);
+ }
+}
+
+static
+int packet_metadata(struct ctf_trace *td, FILE *fp)
+{
+ uint32_t magic;
+ size_t len;
+ int ret = 0;
+
+ len = fread(&magic, sizeof(magic), 1, fp);
+ if (len != 1) {
+ goto end;
+ }
+ if (magic == TSDL_MAGIC) {
+ ret = 1;
+ td->byte_order = BYTE_ORDER;
+ CTF_TRACE_SET_FIELD(td, byte_order);
+ } else if (magic == GUINT32_SWAP_LE_BE(TSDL_MAGIC)) {
+ ret = 1;
+ td->byte_order = (BYTE_ORDER == BIG_ENDIAN) ?
+ LITTLE_ENDIAN : BIG_ENDIAN;
+ CTF_TRACE_SET_FIELD(td, byte_order);
+ }
+end:
+ rewind(fp);
+ return ret;
+}
+
+/*
+ * Returns 0 on success, -1 on error.
+ */
+static
+int check_version(unsigned int major, unsigned int minor)
+{
+ switch (major) {
+ case 1:
+ switch (minor) {
+ case 8:
+ return 0;
+ default:
+ goto warning;
+ }
+ default:
+ goto warning;
+
+ }
+
+ /* eventually return an error instead of warning */
+warning:
+ fprintf(stderr, "[warning] Unsupported CTF specification version %u.%u. Trying anyway.\n",
+ major, minor);
+ return 0;
+}
+
+static
+int ctf_open_trace_metadata_packet_read(struct ctf_trace *td, FILE *in,
+ FILE *out)
+{
+ struct metadata_packet_header header;
+ size_t readlen, writelen, toread;
+ char buf[4096 + 1]; /* + 1 for debug-mode \0 */
+ int ret = 0;
+
+ readlen = fread(&header, header_sizeof(header), 1, in);
+ if (readlen < 1)
+ return -EINVAL;
+
+ if (td->byte_order != BYTE_ORDER) {
+ header.magic = GUINT32_SWAP_LE_BE(header.magic);
+ header.checksum = GUINT32_SWAP_LE_BE(header.checksum);
+ header.content_size = GUINT32_SWAP_LE_BE(header.content_size);
+ header.packet_size = GUINT32_SWAP_LE_BE(header.packet_size);
+ }
+ if (header.checksum)
+ fprintf(stderr, "[warning] checksum verification not supported yet.\n");
+ if (header.compression_scheme) {
+ fprintf(stderr, "[error] compression (%u) not supported yet.\n",
+ header.compression_scheme);
+ return -EINVAL;
+ }
+ if (header.encryption_scheme) {
+ fprintf(stderr, "[error] encryption (%u) not supported yet.\n",
+ header.encryption_scheme);
+ return -EINVAL;
+ }
+ if (header.checksum_scheme) {
+ fprintf(stderr, "[error] checksum (%u) not supported yet.\n",
+ header.checksum_scheme);
+ return -EINVAL;
+ }
+ if (check_version(header.major, header.minor) < 0)
+ return -EINVAL;
+ if (!CTF_TRACE_FIELD_IS_SET(td, uuid)) {
+ memcpy(td->uuid, header.uuid, sizeof(header.uuid));
+ CTF_TRACE_SET_FIELD(td, uuid);
+ } else {
+ if (babeltrace_uuid_compare(header.uuid, td->uuid))
+ return -EINVAL;
+ }
+
+ if ((header.content_size / CHAR_BIT) < header_sizeof(header))
+ return -EINVAL;
+
+ toread = (header.content_size / CHAR_BIT) - header_sizeof(header);
+
+ for (;;) {
+ readlen = fread(buf, sizeof(char), min(sizeof(buf) - 1, toread), in);
+ if (ferror(in)) {
+ ret = -EINVAL;
+ break;
+ }
+ if (babeltrace_debug) {
+ buf[readlen] = '\0';
+ fprintf(stderr, "[debug] metadata packet read: %s\n",
+ buf);
+ }
+
+ writelen = fwrite(buf, sizeof(char), readlen, out);
+ if (writelen < readlen) {
+ ret = -EIO;
+ break;
+ }
+ if (ferror(out)) {
+ ret = -EINVAL;
+ break;
+ }
+ toread -= readlen;
+ if (!toread) {
+ ret = 0; /* continue reading next packet */
+ goto read_padding;
+ }
+ }
+ return ret;
+
+read_padding:
+ toread = (header.packet_size - header.content_size) / CHAR_BIT;
+ ret = fseek(in, toread, SEEK_CUR);
+ if (ret < 0) {
+ fprintf(stderr, "[warning] Missing padding at end of file\n");
+ ret = 0;
+ }
+ return ret;
+}
+
+static
+int ctf_open_trace_metadata_stream_read(struct ctf_trace *td, FILE **fp,
+ char **buf)
+{
+ FILE *in, *out;
+ size_t size, buflen;
+ int ret;
+
+ in = *fp;
+ /*
+ * Using strlen on *buf instead of size of open_memstream
+ * because its size includes garbage at the end (after final
+ * \0). This is the allocated size, not the actual string size.
+ */
+ out = babeltrace_open_memstream(buf, &size);
+ if (out == NULL) {
+ perror("Metadata open_memstream");
+ return -errno;
+ }
+ for (;;) {
+ ret = ctf_open_trace_metadata_packet_read(td, in, out);
+ if (ret) {
+ break;
+ }
+ if (feof(in)) {
+ ret = 0;
+ break;
+ }
+ }
+ /* close to flush the buffer */
+ ret = babeltrace_close_memstream(buf, &size, out);
+ if (ret < 0) {
+ int closeret;
+
+ perror("babeltrace_flush_memstream");
+ ret = -errno;
+ closeret = fclose(in);
+ if (closeret) {
+ perror("Error in fclose");
+ }
+ return ret;
+ }
+ ret = fclose(in);
+ if (ret) {
+ perror("Error in fclose");
+ }
+ /* open for reading */
+ buflen = strlen(*buf);
+ if (!buflen) {
+ *fp = NULL;
+ return -ENOENT;
+ }
+ *fp = babeltrace_fmemopen(*buf, buflen, "rb");
+ if (!*fp) {
+ perror("Metadata fmemopen");
+ return -errno;
+ }
+ return 0;
+}
+
+static
+int ctf_open_trace_metadata_read(struct ctf_trace *td,
+ void (*packet_seek)(struct bt_stream_pos *pos, size_t index,
+ int whence), FILE *metadata_fp)
+{
+ struct ctf_scanner *scanner;
+ struct ctf_file_stream *metadata_stream;
+ FILE *fp;
+ char *buf = NULL;
+ int ret = 0, closeret;
+
+ metadata_stream = g_new0(struct ctf_file_stream, 1);
+ metadata_stream->pos.last_offset = LAST_OFFSET_POISON;
+
+ if (packet_seek) {
+ metadata_stream->pos.packet_seek = packet_seek;
+ } else {
+ fprintf(stderr, "[error] packet_seek function undefined.\n");
+ ret = -1;
+ goto end_free;
+ }
+
+ if (metadata_fp) {
+ fp = metadata_fp;
+ metadata_stream->pos.fd = -1;
+ } else {
+ td->metadata = &metadata_stream->parent;
+ metadata_stream->pos.fd = openat(td->dirfd, "metadata", O_RDONLY);
+ if (metadata_stream->pos.fd < 0) {
+ fprintf(stderr, "Unable to open metadata.\n");
+ ret = -1;
+ goto end_free;
+ }
+
+ fp = fdopen(metadata_stream->pos.fd, "r");
+ if (!fp) {
+ fprintf(stderr, "[error] Unable to open metadata stream.\n");
+ perror("Metadata stream open");
+ ret = -errno;
+ goto end_stream;
+ }
+ /* fd now belongs to fp */
+ metadata_stream->pos.fd = -1;
+ }
+ if (babeltrace_debug)
+ yydebug = 1;
+
+ if (packet_metadata(td, fp)) {
+ ret = ctf_open_trace_metadata_stream_read(td, &fp, &buf);
+ if (ret) {
+ /* Warn about empty metadata */
+ fprintf(stderr, "[warning] Empty metadata.\n");
+ goto end_packet_read;
+ }
+ td->metadata_string = buf;
+ td->metadata_packetized = 1;
+ } else {
+ unsigned int major, minor;
+ ssize_t nr_items;
+
+ td->byte_order = BYTE_ORDER;
+
+ /* Check text-only metadata header and version */
+ nr_items = fscanf(fp, "/* CTF %u.%u", &major, &minor);
+ if (nr_items < 2)
+ fprintf(stderr, "[warning] Ill-shapen or missing \"/* CTF x.y\" header for text-only metadata.\n");
+ if (check_version(major, minor) < 0) {
+ ret = -EINVAL;
+ goto end_packet_read;
+ }
+ rewind(fp);
+ }
+
+ scanner = ctf_scanner_alloc(fp);
+ if (!scanner) {
+ fprintf(stderr, "[error] Error allocating scanner\n");
+ ret = -ENOMEM;
+ goto end_scanner_alloc;
+ }
+ ret = ctf_scanner_append_ast(scanner);
+ if (ret) {
+ fprintf(stderr, "[error] Error creating AST\n");
+ goto end;
+ }
+
+ if (babeltrace_debug) {
+ ret = ctf_visitor_print_xml(stderr, 0, &scanner->ast->root);
+ if (ret) {
+ fprintf(stderr, "[error] Error visiting AST for XML output\n");
+ goto end;
+ }
+ }
+
+ ret = ctf_visitor_semantic_check(stderr, 0, &scanner->ast->root);
+ if (ret) {
+ fprintf(stderr, "[error] Error in CTF semantic validation %d\n", ret);
+ goto end;
+ }
+ ret = ctf_visitor_construct_metadata(stderr, 0, &scanner->ast->root,
+ td, td->byte_order);
+ if (ret) {
+ fprintf(stderr, "[error] Error in CTF metadata constructor %d\n", ret);
+ goto end;
+ }
+end:
+ ctf_scanner_free(scanner);
+end_scanner_alloc:
+end_packet_read:
+ if (fp) {
+ closeret = fclose(fp);
+ if (closeret) {
+ perror("Error on fclose");
+ }
+ }
+end_stream:
+ if (metadata_stream->pos.fd >= 0) {
+ closeret = close(metadata_stream->pos.fd);
+ if (closeret) {
+ perror("Error on metadata stream fd close");
+ }
+ }
+end_free:
+ if (ret)
+ g_free(metadata_stream);
+ return ret;
+}
+
+static
+struct ctf_event_definition *create_event_definitions(struct ctf_trace *td,
+ struct ctf_stream_definition *stream,
+ struct ctf_event_declaration *event)
+{
+ struct ctf_event_definition *stream_event = g_new0(struct ctf_event_definition, 1);
+
+ if (event->context_decl) {
+ struct bt_definition *definition =
+ event->context_decl->p.definition_new(&event->context_decl->p,
+ stream->parent_def_scope, 0, 0, "event.context");
+ if (!definition) {
+ goto error;
+ }
+ stream_event->event_context = container_of(definition,
+ struct definition_struct, p);
+ stream->parent_def_scope = stream_event->event_context->p.scope;
+ }
+ if (event->fields_decl) {
+ struct bt_definition *definition =
+ event->fields_decl->p.definition_new(&event->fields_decl->p,
+ stream->parent_def_scope, 0, 0, "event.fields");
+ if (!definition) {
+ goto error;
+ }
+ stream_event->event_fields = container_of(definition,
+ struct definition_struct, p);
+ stream->parent_def_scope = stream_event->event_fields->p.scope;
+ }
+ stream_event->stream = stream;
+ return stream_event;
+
+error:
+ if (stream_event->event_fields)
+ bt_definition_unref(&stream_event->event_fields->p);
+ if (stream_event->event_context)
+ bt_definition_unref(&stream_event->event_context->p);
+ fprintf(stderr, "[error] Unable to create event definition for event \"%s\".\n",
+ g_quark_to_string(event->name));
+ return NULL;
+}
+
+static
+int create_stream_definitions(struct ctf_trace *td, struct ctf_stream_definition *stream)
+{
+ struct ctf_stream_declaration *stream_class;
+ int ret;
+ int i;
+
+ if (stream->stream_definitions_created)
+ return 0;
+
+ stream_class = stream->stream_class;
+
+ if (stream_class->packet_context_decl) {
+ struct bt_definition *definition =
+ stream_class->packet_context_decl->p.definition_new(&stream_class->packet_context_decl->p,
+ stream->parent_def_scope, 0, 0, "stream.packet.context");
+ if (!definition) {
+ ret = -EINVAL;
+ goto error;
+ }
+ stream->stream_packet_context = container_of(definition,
+ struct definition_struct, p);
+ stream->parent_def_scope = stream->stream_packet_context->p.scope;
+ }
+ if (stream_class->event_header_decl) {
+ struct bt_definition *definition =
+ stream_class->event_header_decl->p.definition_new(&stream_class->event_header_decl->p,
+ stream->parent_def_scope, 0, 0, "stream.event.header");
+ if (!definition) {
+ ret = -EINVAL;
+ goto error;
+ }
+ stream->stream_event_header =
+ container_of(definition, struct definition_struct, p);
+ stream->parent_def_scope = stream->stream_event_header->p.scope;
+ }
+ if (stream_class->event_context_decl) {
+ struct bt_definition *definition =
+ stream_class->event_context_decl->p.definition_new(&stream_class->event_context_decl->p,
+ stream->parent_def_scope, 0, 0, "stream.event.context");
+ if (!definition) {
+ ret = -EINVAL;
+ goto error;
+ }
+ stream->stream_event_context =
+ container_of(definition, struct definition_struct, p);
+ stream->parent_def_scope = stream->stream_event_context->p.scope;
+ }
+ stream->events_by_id = g_ptr_array_new();
+ g_ptr_array_set_size(stream->events_by_id, stream_class->events_by_id->len);
+ for (i = 0; i < stream->events_by_id->len; i++) {
+ struct ctf_event_declaration *event = g_ptr_array_index(stream_class->events_by_id, i);
+ struct ctf_event_definition *stream_event;
+
+ if (!event)
+ continue;
+ stream_event = create_event_definitions(td, stream, event);
+ if (!stream_event) {
+ ret = -EINVAL;
+ goto error_event;
+ }
+ g_ptr_array_index(stream->events_by_id, i) = stream_event;
+ }
+ return 0;
+
+error_event:
+ for (i = 0; i < stream->events_by_id->len; i++) {
+ struct ctf_event_definition *stream_event = g_ptr_array_index(stream->events_by_id, i);
+ if (stream_event)
+ g_free(stream_event);
+ }
+ g_ptr_array_free(stream->events_by_id, TRUE);
+error:
+ if (stream->stream_event_context)
+ bt_definition_unref(&stream->stream_event_context->p);
+ if (stream->stream_event_header)
+ bt_definition_unref(&stream->stream_event_header->p);
+ if (stream->stream_packet_context)
+ bt_definition_unref(&stream->stream_packet_context->p);
+ fprintf(stderr, "[error] Unable to create stream (%" PRIu64 ") definitions: %s\n",
+ stream_class->stream_id, strerror(-ret));
+ return ret;
+}
+
+static
+int create_stream_one_packet_index(struct ctf_stream_pos *pos,
+ struct ctf_trace *td,
+ struct ctf_file_stream *file_stream,
+ size_t filesize)
+{
+ struct packet_index packet_index;
+ struct ctf_stream_declaration *stream;
+ uint64_t stream_id = 0;
+ uint64_t packet_map_len = DEFAULT_HEADER_LEN, tmp_map_len;
+ int first_packet = 0;
+ int len_index;
+ int ret;
+
+begin:
+ if (!pos->mmap_offset) {
+ first_packet = 1;
+ }
+
+ if (filesize - pos->mmap_offset < (packet_map_len >> LOG2_CHAR_BIT)) {
+ packet_map_len = (filesize - pos->mmap_offset) << LOG2_CHAR_BIT;
+ }
+
+ if (pos->base_mma) {
+ /* unmap old base */
+ ret = munmap_align(pos->base_mma);
+ if (ret) {
+ fprintf(stderr, "[error] Unable to unmap old base: %s.\n",
+ strerror(errno));
+ return ret;
+ }
+ pos->base_mma = NULL;
+ }
+ /* map new base. Need mapping length from header. */
+ pos->base_mma = mmap_align(packet_map_len >> LOG2_CHAR_BIT, PROT_READ,
+ MAP_PRIVATE, pos->fd, pos->mmap_offset);
+ assert(pos->base_mma != MAP_FAILED);
+ /*
+ * Use current mapping size as temporary content and packet
+ * size.
+ */
+ pos->content_size = packet_map_len;
+ pos->packet_size = packet_map_len;
+ pos->offset = 0; /* Position of the packet header */
+
+ packet_index.offset = pos->mmap_offset;
+ packet_index.content_size = 0;
+ packet_index.packet_size = 0;
+ packet_index.timestamp_begin = 0;
+ packet_index.timestamp_end = 0;
+ packet_index.events_discarded = 0;
+ packet_index.events_discarded_len = 0;
+
+ /* read and check header, set stream id (and check) */
+ if (file_stream->parent.trace_packet_header) {
+ /* Read packet header */
+ ret = generic_rw(&pos->parent, &file_stream->parent.trace_packet_header->p);
+ if (ret) {
+ if (ret == -EFAULT)
+ goto retry;
+ fprintf(stderr, "[error] Unable to read packet header: %s\n", strerror(-ret));
+ return ret;
+ }
+ len_index = bt_struct_declaration_lookup_field_index(file_stream->parent.trace_packet_header->declaration, g_quark_from_static_string("magic"));
+ if (len_index >= 0) {
+ struct bt_definition *field;
+ uint64_t magic;
+
+ field = bt_struct_definition_get_field_from_index(file_stream->parent.trace_packet_header, len_index);
+ magic = bt_get_unsigned_int(field);
+ if (magic != CTF_MAGIC) {
+ fprintf(stderr, "[error] Invalid magic number 0x%" PRIX64 " at packet %u (file offset %zd).\n",
+ magic,
+ file_stream->pos.packet_cycles_index->len,
+ (ssize_t) pos->mmap_offset);
+ return -EINVAL;
+ }
+ }
+
+ /* check uuid */
+ len_index = bt_struct_declaration_lookup_field_index(file_stream->parent.trace_packet_header->declaration, g_quark_from_static_string("uuid"));
+ if (len_index >= 0) {
+ struct definition_array *defarray;
+ struct bt_definition *field;
+ uint64_t i;
+ uint8_t uuidval[BABELTRACE_UUID_LEN];
+
+ field = bt_struct_definition_get_field_from_index(file_stream->parent.trace_packet_header, len_index);
+ assert(field->declaration->id == CTF_TYPE_ARRAY);
+ defarray = container_of(field, struct definition_array, p);
+ assert(bt_array_len(defarray) == BABELTRACE_UUID_LEN);
+
+ for (i = 0; i < BABELTRACE_UUID_LEN; i++) {
+ struct bt_definition *elem;
+
+ elem = bt_array_index(defarray, i);
+ uuidval[i] = bt_get_unsigned_int(elem);
+ }
+ ret = babeltrace_uuid_compare(td->uuid, uuidval);
+ if (ret) {
+ fprintf(stderr, "[error] Unique Universal Identifiers do not match.\n");
+ return -EINVAL;
+ }
+ }
+
+ len_index = bt_struct_declaration_lookup_field_index(file_stream->parent.trace_packet_header->declaration, g_quark_from_static_string("stream_id"));
+ if (len_index >= 0) {
+ struct bt_definition *field;
+
+ field = bt_struct_definition_get_field_from_index(file_stream->parent.trace_packet_header, len_index);
+ stream_id = bt_get_unsigned_int(field);
+ }
+ }
+
+ if (!first_packet && file_stream->parent.stream_id != stream_id) {
+ fprintf(stderr, "[error] Stream ID is changing within a stream: expecting %" PRIu64 ", but packet has %" PRIu64 "\n",
+ stream_id,
+ file_stream->parent.stream_id);
+ return -EINVAL;
+ }
+ if (first_packet) {
+ file_stream->parent.stream_id = stream_id;
+ if (stream_id >= td->streams->len) {
+ fprintf(stderr, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
+ return -EINVAL;
+ }
+ stream = g_ptr_array_index(td->streams, stream_id);
+ if (!stream) {
+ fprintf(stderr, "[error] Stream %" PRIu64 " is not declared in metadata.\n", stream_id);
+ return -EINVAL;
+ }
+ file_stream->parent.stream_class = stream;
+ ret = create_stream_definitions(td, &file_stream->parent);
+ if (ret)
+ return ret;
+ }
+
+ if (file_stream->parent.stream_packet_context) {
+ /* Read packet context */
+ ret = generic_rw(&pos->parent, &file_stream->parent.stream_packet_context->p);
+ if (ret) {
+ if (ret == -EFAULT)
+ goto retry;
+ fprintf(stderr, "[error] Unable to read packet context: %s\n", strerror(-ret));
+ return ret;
+ }
+ /* read content size from header */
+ len_index = bt_struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("content_size"));
+ if (len_index >= 0) {
+ struct bt_definition *field;
+
+ field = bt_struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
+ packet_index.content_size = bt_get_unsigned_int(field);
+ } else {
+ /* Use file size for packet size */
+ packet_index.content_size = filesize * CHAR_BIT;
+ }
+
+ /* read packet size from header */
+ len_index = bt_struct_declaration_lookup_field_index(file_stream->parent.stream_packet_context->declaration, g_quark_from_static_string("packet_size"));
+ if (len_index >= 0) {
+ struct bt_definition *field;
+
+ field = bt_struct_definition_get_field_from_index(file_stream->parent.stream_packet_context, len_index);
+ packet_index.packet_size = bt_get_unsigned_int(field);
+ } else {
+ /* Use content size if non-zero, else file size */
+ packet_index.packet_size = packet_index.content_size ? : filesize * CHAR_BIT;
+ }