X-Git-Url: http://git.efficios.com/?a=blobdiff_plain;f=include%2Fbabeltrace%2Fctf-ir%2Fstream.h;h=18f86a7c0949ca10e550d29a8443c616723b3aaa;hb=61cf588beae752e5ddfc60b6b5310f769ac9e852;hp=0341e78ef4ad5f8ab30ee09a12e7049d316349ce;hpb=3f043b0587e8c2bc1f8921438c112e41fa54db8f;p=babeltrace.git

diff --git a/include/babeltrace/ctf-ir/stream.h b/include/babeltrace/ctf-ir/stream.h
index 0341e78e..18f86a7c 100644
--- a/include/babeltrace/ctf-ir/stream.h
+++ b/include/babeltrace/ctf-ir/stream.h
@@ -31,6 +31,7 @@
  */
 
 #include <babeltrace/ctf-ir/stream-class.h>
+#include <stdint.h>
 
 #ifdef __cplusplus
 extern "C" {
@@ -39,10 +40,36 @@ extern "C" {
 struct bt_ctf_event;
 struct bt_ctf_stream;
 
+/*
+ * bt_ctf_stream_get_stream_class: get a stream's class.
+ *
+ * @param stream Stream instance.
+ *
+ * Returns the stream's class, NULL on error.
+ */
+extern struct bt_ctf_stream_class *bt_ctf_stream_get_class(
+		struct bt_ctf_stream *stream);
+
+/*
+ * bt_ctf_stream_get_discarded_events_count: get the number of discarded
+ * events associated with this stream.
+ *
+ * Note that discarded events are not stored if the stream's packet
+ * context has no "events_discarded" field. An error will be returned
+ * in that case.
+ *
+ * @param stream Stream instance.
+ *
+ * Returns the number of discarded events, a negative value on error.
+ */
+extern int bt_ctf_stream_get_discarded_events_count(
+		struct bt_ctf_stream *stream, uint64_t *count);
+
 /*
  * bt_ctf_stream_append_discarded_events: increment discarded events count.
  *
- * Increase the current packet's discarded event count.
+ * Increase the current packet's discarded event count. Has no effect if the
+ * stream class' packet context has no "events_discarded" field.
  *
  * @param stream Stream instance.
  * @param event_count Number of discarded events to add to the stream's current
@@ -60,6 +87,9 @@ extern void bt_ctf_stream_append_discarded_events(struct bt_ctf_stream *stream,
  * incrementing its reference count. The current packet is not flushed to disk
  * until the next call to bt_ctf_stream_flush.
  *
+ * The stream event context will be sampled for every appended event if
+ * a stream event context was defined.
+ *
  * @param stream Stream instance.
  * @param event Event instance to append to the stream's current packet.
  *
@@ -68,11 +98,116 @@ extern void bt_ctf_stream_append_discarded_events(struct bt_ctf_stream *stream,
 extern int bt_ctf_stream_append_event(struct bt_ctf_stream *stream,
 		struct bt_ctf_event *event);
 
+/*
+ * bt_ctf_stream_get_packet_header: get a stream's packet header.
+ *
+ * @param stream Stream instance.
+ *
+ * Returns a field instance on success, NULL on error.
+ */
+extern struct bt_ctf_field *bt_ctf_stream_get_packet_header(
+		struct bt_ctf_stream *stream);
+
+/*
+ * bt_ctf_stream_set_packet_header: set a stream's packet header.
+ *
+ * The packet header's type must match the trace's packet header
+ * type.
+ *
+ * @param stream Stream instance.
+ * @param packet_header Packet header instance.
+ *
+ * Returns a field instance on success, NULL on error.
+ */
+extern int bt_ctf_stream_set_packet_header(
+		struct bt_ctf_stream *stream,
+		struct bt_ctf_field *packet_header);
+
+/*
+ * bt_ctf_stream_get_packet_context: get a stream's packet context.
+ *
+ * @param stream Stream instance.
+ *
+ * Returns a field instance on success, NULL on error.
+ */
+extern struct bt_ctf_field *bt_ctf_stream_get_packet_context(
+		struct bt_ctf_stream *stream);
+
+/*
+ * bt_ctf_stream_set_packet_context: set a stream's packet context.
+ *
+ * The packet context's type must match the stream class' packet
+ * context type.
+ *
+ * @param stream Stream instance.
+ * @param packet_context Packet context field instance.
+ *
+ * Returns a field instance on success, NULL on error.
+ */
+extern int bt_ctf_stream_set_packet_context(
+		struct bt_ctf_stream *stream,
+		struct bt_ctf_field *packet_context);
+
+/*
+ * bt_ctf_stream_get_event_header: get a stream's event header.
+ *
+ * @param stream Stream instance.
+ *
+ * Returns a field instance on success, NULL on error.
+ */
+extern struct bt_ctf_field *bt_ctf_stream_get_event_header(
+		struct bt_ctf_stream *stream);
+
+/*
+ * bt_ctf_stream_set_event_header: set a stream's event header.
+ *
+ * The event header's type must match the stream class' event
+ * header type.
+ *
+ * @param stream Stream instance.
+ * @param event_header Event header field instance.
+ *
+ * Returns a field instance on success, NULL on error.
+ */
+extern int bt_ctf_stream_set_event_header(
+		struct bt_ctf_stream *stream,
+		struct bt_ctf_field *event_header);
+
+/*
+ * bt_ctf_stream_get_event_context: get a stream's event context.
+ *
+ * @param stream Stream instance.
+ *
+ * Returns a field instance on success, NULL on error.
+ */
+extern struct bt_ctf_field *bt_ctf_stream_get_event_context(
+		struct bt_ctf_stream *stream);
+
+/*
+ * bt_ctf_stream_set_event_context: set a stream's event context.
+ *
+ * The event context's type must match the stream class' event
+ * context type.
+ *
+ * @param stream Stream instance.
+ * @param event_context Event context field instance.
+ *
+ * Returns a field instance on success, NULL on error.
+ */
+extern int bt_ctf_stream_set_event_context(
+		struct bt_ctf_stream *stream,
+		struct bt_ctf_field *event_context);
+
 /*
  * bt_ctf_stream_flush: flush a stream.
  *
- * The stream's current packet's events will be flushed to disk. Events
- * subsequently appended to the stream will be added to a new packet.
+ * The stream's current packet's events will be flushed, thus closing the
+ * current packet. Events subsequently appended to the stream will be
+ * added to a new packet.
+ *
+ * Flushing will also set the packet context's default attributes if
+ * they remained unset while populating the current packet. These default
+ * attributes, along with their expected types, are detailed in stream-class.h.
  *
  * @param stream Stream instance.
  *
@@ -84,6 +219,8 @@ extern int bt_ctf_stream_flush(struct bt_ctf_stream *stream);
  * bt_ctf_stream_get and bt_ctf_stream_put: increment and decrement the
  * stream's reference count.
  *
+ * You may also use bt_ctf_get() and bt_ctf_put() with stream objects.
+ *
  * These functions ensure that the stream won't be destroyed while it
  * is in use. The same number of get and put (plus one extra put to
  * release the initial reference done at creation) have to be done to