API fix/breakage : reexporting bt_ctf_event

[babeltrace.git] / include / babeltrace / context.h

diff --git a/include/babeltrace/context.h b/include/babeltrace/context.h
index 738a8432c61be0c003742225abbe6ea405884401..4a85ff9966162aefa6c61b757ff510a62a659dec 100644 (file)
--- a/include/babeltrace/context.h
+++ b/include/babeltrace/context.h
@@ -23,24 +23,13 @@
  * included in all copies or substantial portions of the Software.
  */
 
-struct trace_collection;
-struct GHashTable;
+#include <unistd.h>
+#include <babeltrace/format.h>
 
-/*
- * The context represents the object in which a trace_collection is
- * open. As long as this structure is allocated, the trace_collection is
- * open and the traces it contains can be read and seeked by the
- * iterators and callbacks.
- *
- * It has to be created with the bt_context_create() function and
- * destroyed by calling one more bt_context_put() than bt_context_get()
- */
-struct bt_context {
-       struct trace_collection *tc;
-       GHashTable *trace_handles;
-       int refcount;
-       int last_trace_handle_id;
-};
+/* struct bt_context is opaque to the user */
+struct bt_context;
+struct stream_pos;
+struct bt_ctf_event;
 
 /*
  * bt_context_create : create a Babeltrace context
@@ -55,23 +44,36 @@ struct bt_context *bt_context_create(void);
 /*
  * bt_context_add_trace : Add a trace by path to the context
  *
- * Open a trace
+ * Open a trace.
  *
- * Return the trace handle id of the opened trace
- */
-int bt_context_add_trace(struct bt_context *ctx, const char *path,
-               const char *format);
-
-/*
- * bt_context_add_traces: Open a trace recursively
+ * path is the path to the trace, it is not recursive. If "path" is NULL,
+ * stream_list is used instead as a list of mmap streams to open for the trace.
+ *
+ * format is a string containing the format name in which the trace was
+ * produced.
  *
- * Find each trace present in the subdirectory starting from the given
- * path, and add them to the context.
+ * packet_seek can be NULL to use the default packet_seek handler provided by
+ * the trace format. If non-NULL, it is used as an override of the handler for
+ * seeks across packets. It takes as parameter a stream position, the packet
+ * index it needs to seek to (for SEEK_SET), and a "whence" parameter (either
+ * SEEK_CUR: seek to next packet, or SEEK_SET: seek to packet at packet index).
  *
- * Return: 0 on success, nonzero on failure.
+ * stream_list is a linked list of streams, it is used to open a trace where
+ * the trace data is located in memory mapped areas instead of trace files,
+ * this argument should be set to NULL when path is not NULL.
+ *
+ * The metadata parameter acts as a metadata override when not NULL, otherwise
+ * the format handles the metadata opening.
+ *
+ * Return: the trace handle id (>= 0) on success, a negative
+ * value on error.
  */
-int bt_context_add_traces(struct bt_context *ctx, const char *path,
-               const char *format);
+int bt_context_add_trace(struct bt_context *ctx, const char *path,
+               const char *format,
+               void (*packet_seek)(struct stream_pos *pos,
+                       size_t index, int whence),
+               struct mmap_stream_list *stream_list,
+               FILE *metadata);
 
 /*
  * bt_context_remove_trace: Remove a trace from the context.
@@ -95,4 +97,11 @@ void bt_context_remove_trace(struct bt_context *ctx, int trace_id);
 void bt_context_get(struct bt_context *ctx);
 void bt_context_put(struct bt_context *ctx);
 
+/*
+ * bt_ctf_get_context : get the context associated with an event
+ *
+ * Returns NULL on error
+ */
+struct bt_context *bt_ctf_event_get_context(const struct bt_ctf_event *event);
+
 #endif /* _BABELTRACE_CONTEXT_H */