ir: stream: add bt_ctf_stream_is_writer()

This function indicates whether or not the stream is in
"CTF writer mode", that is, its trace parent was created by a
CTF writer object and it has an open file descriptor.

Signed-off-by: Philippe Proulx <eeppeliteloop@gmail.com>
Signed-off-by: Jérémie Galarneau <jeremie.galarneau@efficios.com>

diff --git a/formats/ctf/ir/stream.c b/formats/ctf/ir/stream.c
index d4dbc447ca6a6b1fe16d6004c90e408c97f1ee61..5e9e133794232aeba637540998dd6afd7c84c4bd 100644 (file)
--- a/formats/ctf/ir/stream.c
+++ b/formats/ctf/ir/stream.c
@@ -1000,3 +1000,17 @@ const char *bt_ctf_stream_get_name(struct bt_ctf_stream *stream)
 end:
        return name;
 }
+
+int bt_ctf_stream_is_writer(struct bt_ctf_stream *stream)
+{
+       int ret = -1;
+
+       if (!stream) {
+               goto end;
+       }
+
+       ret = (stream->pos.fd >= 0);
+
+end:
+       return ret;
+}

diff --git a/include/babeltrace/ctf-writer/stream.h b/include/babeltrace/ctf-writer/stream.h
index f8ad7b835b600e18755bee789af89066663cb9b9..56b6bff8c29edb10bd5e1da77050d4345d6c506f 100644 (file)
--- a/include/babeltrace/ctf-writer/stream.h
+++ b/include/babeltrace/ctf-writer/stream.h
@@ -152,6 +152,8 @@ extern int bt_ctf_stream_set_packet_context(
  */
 extern int bt_ctf_stream_flush(struct bt_ctf_stream *stream);
 
+extern int bt_ctf_stream_is_writer(struct bt_ctf_stream *stream);
+
 /*
  * bt_ctf_stream_get and bt_ctf_stream_put: increment and decrement the
  * stream's reference count.