+ if (pos->offset == EOF)
+ return EOF;
+
+ /* Read event header */
+ if (stream_class->event_header) {
+ struct definition_integer *integer_definition;
+
+ ret = generic_rw(ppos, &stream_class->event_header->p);
+ if (ret)
+ goto error;
+ /* lookup event id */
+ integer_definition = lookup_integer(&stream_class->event_header->p, "id", FALSE);
+ if (integer_definition) {
+ id = integer_definition->value._unsigned;
+ } else {
+ struct definition_enum *enum_definition;
+
+ enum_definition = lookup_enum(&stream_class->event_header->p, "id", FALSE);
+ if (enum_definition) {
+ id = enum_definition->integer->value._unsigned;
+ }
+ }
+
+ /* lookup timestamp */
+ integer_definition = lookup_integer(&stream_class->event_header->p, "timestamp", FALSE);
+ if (integer_definition) {
+ stream->timestamp = integer_definition->value._unsigned;
+ } else {
+ struct definition *definition;
+
+ definition = lookup_variant(&stream_class->event_header->p, "v");
+ if (definition) {
+ integer_definition = lookup_integer(definition, "id", FALSE);
+ if (integer_definition) {
+ id = integer_definition->value._unsigned;
+ }
+ integer_definition = lookup_integer(definition, "timestamp", FALSE);
+ if (integer_definition) {
+ stream->timestamp = integer_definition->value._unsigned;
+ }
+ }
+ }
+ }
+
+ /* Read stream-declared event context */
+ if (stream_class->event_context) {
+ ret = generic_rw(ppos, &stream_class->event_context->p);
+ if (ret)
+ goto error;
+ }
+
+ if (id >= stream_class->events_by_id->len) {
+ fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
+ return -EINVAL;
+ }
+ event_class = g_ptr_array_index(stream_class->events_by_id, id);
+ if (!event_class) {
+ fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
+ return -EINVAL;
+ }
+
+ /* Read event-declared event context */
+ if (event_class->context) {
+ ret = generic_rw(ppos, &event_class->context->p);
+ if (ret)
+ goto error;
+ }
+
+ /* Read event payload */
+ if (event_class->fields) {
+ ret = generic_rw(ppos, &event_class->fields->p);
+ if (ret)
+ goto error;
+ }
+
+ return 0;
+
+error:
+ fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
+ return ret;
+}
+
+static
+int ctf_write_event(struct stream_pos *pos, struct ctf_stream *stream)
+{
+ struct ctf_stream_class *stream_class = stream->stream_class;
+ struct ctf_event *event_class;
+ uint64_t id = 0;
+ int len_index;
+ int ret;
+
+ /* print event header */
+ if (stream_class->event_header) {
+ /* lookup event id */
+ len_index = struct_declaration_lookup_field_index(stream_class->event_header_decl,
+ g_quark_from_static_string("id"));
+ if (len_index >= 0) {
+ struct definition_integer *defint;
+ struct definition *field;
+
+ field = struct_definition_get_field_from_index(stream_class->event_header, len_index);
+ assert(field->declaration->id == CTF_TYPE_INTEGER);
+ defint = container_of(field, struct definition_integer, p);
+ assert(defint->declaration->signedness == FALSE);
+ id = defint->value._unsigned; /* set id */
+ }
+
+ ret = generic_rw(pos, &stream_class->event_header->p);
+ if (ret)
+ goto error;
+ }
+
+ /* print stream-declared event context */
+ if (stream_class->event_context) {
+ ret = generic_rw(pos, &stream_class->event_context->p);
+ if (ret)
+ goto error;
+ }
+
+ if (id >= stream_class->events_by_id->len) {
+ fprintf(stdout, "[error] Event id %" PRIu64 " is outside range.\n", id);
+ return -EINVAL;
+ }
+ event_class = g_ptr_array_index(stream_class->events_by_id, id);
+ if (!event_class) {
+ fprintf(stdout, "[error] Event id %" PRIu64 " is unknown.\n", id);
+ return -EINVAL;
+ }
+
+ /* print event-declared event context */
+ if (event_class->context) {
+ ret = generic_rw(pos, &event_class->context->p);
+ if (ret)
+ goto error;
+ }
+
+ /* Read and print event payload */
+ if (event_class->fields) {
+ ret = generic_rw(pos, &event_class->fields->p);
+ if (ret)
+ goto error;
+ }
+
+ return 0;
+
+error:
+ fprintf(stdout, "[error] Unexpected end of stream. Either the trace data stream is corrupted or metadata description does not match data layout.\n");
+ return ret;
+}
+
+void ctf_init_pos(struct ctf_stream_pos *pos, int fd, int open_flags)
+{
+ pos->fd = fd;
+ pos->mmap_offset = 0;
+ pos->packet_size = 0;
+ pos->content_size = 0;
+ pos->content_size_loc = NULL;
+ pos->base = NULL;
+ pos->offset = 0;
+ pos->dummy = false;
+ pos->cur_index = 0;
+ if (fd >= 0)
+ pos->packet_index = g_array_new(FALSE, TRUE,
+ sizeof(struct packet_index));
+ else
+ pos->packet_index = NULL;
+ switch (open_flags & O_ACCMODE) {
+ case O_RDONLY:
+ pos->prot = PROT_READ;
+ pos->flags = MAP_PRIVATE;
+ pos->parent.rw_table = read_dispatch_table;
+ pos->parent.event_cb = ctf_read_event;
+ break;
+ case O_RDWR:
+ pos->prot = PROT_WRITE; /* Write has priority */
+ pos->flags = MAP_SHARED;
+ pos->parent.rw_table = write_dispatch_table;
+ pos->parent.event_cb = ctf_write_event;
+ if (fd >= 0)
+ ctf_move_pos_slow(pos, 0, SEEK_SET); /* position for write */
+ break;
+ default:
+ assert(0);
+ }
+}
+
+void ctf_fini_pos(struct ctf_stream_pos *pos)
+{
+ int ret;
+
+ if (pos->prot == PROT_WRITE && pos->content_size_loc)
+ *pos->content_size_loc = pos->offset;
+ if (pos->base) {
+ /* unmap old base */
+ ret = munmap(pos->base, pos->packet_size / CHAR_BIT);
+ if (ret) {
+ fprintf(stdout, "[error] Unable to unmap old base: %s.\n",
+ strerror(errno));
+ assert(0);
+ }
+ }
+ (void) g_array_free(pos->packet_index, TRUE);
+}
+
+void ctf_move_pos_slow(struct ctf_stream_pos *pos, size_t offset, int whence)
+{
+ int ret;
+ off_t off;
+ struct packet_index *index;
+
+ if (pos->prot == PROT_WRITE && pos->content_size_loc)
+ *pos->content_size_loc = pos->offset;