src.text.dmesg: implement "seek beginning" and "can seek beginning" methods

[babeltrace.git] / plugins / text / dmesg / dmesg.c

diff --git a/plugins/text/dmesg/dmesg.c b/plugins/text/dmesg/dmesg.c
index aac38c23e3fa294a17f08d001a91f115c57ed806..29cef2f59d1e782f0c2565ca76f665e035ace1d8 100644 (file)
--- a/plugins/text/dmesg/dmesg.c
+++ b/plugins/text/dmesg/dmesg.c
@@ -147,6 +147,13 @@ int create_meta(struct dmesg_component *dmesg_comp, bool has_ts)
                        goto error;
                }
 
+               /*
+                * The `dmesg` timestamp is not absolute, it's relative
+                * to the boot time.
+                */
+               bt_clock_class_set_is_absolute(dmesg_comp->clock_class,
+                       BT_FALSE);
+
                ret = bt_stream_class_set_default_clock_class(
                        dmesg_comp->stream_class, dmesg_comp->clock_class);
                if (ret) {
@@ -640,6 +647,8 @@ void destroy_dmesg_msg_iter(struct dmesg_msg_iter *dmesg_msg_iter)
        g_free(dmesg_msg_iter);
 }
 
+
+
 BT_HIDDEN
 bt_self_message_iterator_status dmesg_msg_iter_init(
                bt_self_message_iterator *self_msg_iter,
@@ -890,3 +899,29 @@ bt_self_message_iterator_status dmesg_msg_iter_next(
 
        return status;
 }
+
+BT_HIDDEN
+bt_bool dmesg_msg_iter_can_seek_beginning(
+               bt_self_message_iterator *self_msg_iter)
+{
+       struct dmesg_msg_iter *dmesg_msg_iter =
+               bt_self_message_iterator_get_data(self_msg_iter);
+
+       /* Can't seek the beginning of the standard input stream */
+       return !dmesg_msg_iter->dmesg_comp->params.read_from_stdin;
+}
+
+BT_HIDDEN
+bt_self_message_iterator_status dmesg_msg_iter_seek_beginning(
+               bt_self_message_iterator *self_msg_iter)
+{
+       struct dmesg_msg_iter *dmesg_msg_iter =
+               bt_self_message_iterator_get_data(self_msg_iter);
+
+       BT_ASSERT(!dmesg_msg_iter->dmesg_comp->params.read_from_stdin);
+
+       BT_MESSAGE_PUT_REF_AND_RESET(dmesg_msg_iter->tmp_event_msg);
+       dmesg_msg_iter->last_clock_value = 0;
+       dmesg_msg_iter->state = STATE_EMIT_STREAM_BEGINNING;
+       return BT_SELF_MESSAGE_ITERATOR_STATUS_OK;
+}