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[babeltrace.git] / formats / ctf / ctf.c

diff --git a/formats/ctf/ctf.c b/formats/ctf/ctf.c
index 1e7fedd8d3319cae443e838c45a9e2f0e74a302e..50cc93de1d866b83a3302767871707ff3c4e5799 100644 (file)
--- a/formats/ctf/ctf.c
+++ b/formats/ctf/ctf.c
@@ -79,6 +79,144 @@ struct format ctf_format = {
        .close_trace = ctf_close_trace,
 };
 
+static
+int ctf_read_event(struct stream_pos *ppos, struct ctf_stream *stream_class)
+{
+       struct ctf_stream_pos *pos =
+               container_of(ppos, struct ctf_stream_pos, parent);
+       struct ctf_event *event_class;
+       uint64_t id = 0;
+       int len_index;
+       int ret;
+
+       if (pos->offset == EOF)
+               return EOF;
+
+       /* Read event header */
+       if (stream_class->event_header) {
+               ret = generic_rw(ppos, &stream_class->event_header->p);
+               if (ret)
+                       goto error;
+               /* 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 */
+               }
+       }
+
+       /* 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_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;
@@ -100,11 +238,13 @@ void ctf_init_pos(struct ctf_stream_pos *pos, int fd, int open_flags)
                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;