Move to kernel style SPDX license identifiers

[babeltrace.git] / include / babeltrace2-ctf-writer / stream.h

/*
 * SPDX-License-Identifier: MIT
 *
 * Copyright (C) 2010-2019 EfficiOS Inc. and Linux Foundation
 */

#ifndef BABELTRACE2_CTF_WRITER_STREAM_H
#define BABELTRACE2_CTF_WRITER_STREAM_H

#include <stdint.h>

#ifdef __cplusplus
extern "C" {
#endif

struct bt_ctf_stream;
struct bt_ctf_event;

/*
 * 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. 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
 *	packet.
 */
extern void bt_ctf_stream_append_discarded_events(struct bt_ctf_stream *stream,
		uint64_t event_count);

/*
 * bt_ctf_stream_append_event: append an event to the stream.
 *
 * Append "event" to the stream's current packet. The stream's associated clock
 * will be sampled during this call. The event shall not be modified after
 * being appended to a stream. The stream will share the event's ownership by
 * 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.
 *
 * Returns 0 on success, a negative value on error.
 */
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_flush: flush a stream.
 *
 * 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.
 *
 * Returns 0 on success, a negative value on error.
 */
extern int bt_ctf_stream_flush(struct bt_ctf_stream *stream);

extern int bt_ctf_stream_is_writer(struct bt_ctf_stream *stream);

extern
struct bt_ctf_stream *bt_ctf_stream_create(
		struct bt_ctf_stream_class *stream_class,
		const char *name, uint64_t id);

extern struct bt_ctf_stream_class *bt_ctf_stream_get_class(
		struct bt_ctf_stream *stream);

extern const char *bt_ctf_stream_get_name(struct bt_ctf_stream *stream);

extern int64_t bt_ctf_stream_get_id(struct bt_ctf_stream *stream);

/* Pre-2.0 CTF writer compatibility */
static inline
void bt_ctf_stream_get(struct bt_ctf_stream *stream)
{
	bt_ctf_object_get_ref(stream);
}

/* Pre-2.0 CTF writer compatibility */
static inline
void bt_ctf_stream_put(struct bt_ctf_stream *stream)
{
	bt_ctf_object_put_ref(stream);
}

#ifdef __cplusplus
}
#endif

#endif /* BABELTRACE2_CTF_WRITER_STREAM_H */