common: compile librelayd as C++

[lttng-tools.git] / src / common / index / index.h

/*
 * Copyright (C) 2013 Julien Desfossez <jdesfossez@efficios.com>
 * Copyright (C) 2013 David Goulet <dgoulet@efficios.com>
 * Copyright (C) 2016 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 */

#ifndef _INDEX_H
#define _INDEX_H

#include <inttypes.h>
#include <urcu/ref.h>

#include "ctf-index.h"
#include <common/fs-handle.h>
#include <common/trace-chunk.h>

#ifdef __cplusplus
extern "C" {
#endif

struct lttng_index_file {
	struct fs_handle *file;
	uint32_t major;
	uint32_t minor;
	uint32_t element_len;
	struct lttng_trace_chunk *trace_chunk;
	struct urcu_ref ref;
};

/*
 * create and open have refcount of 1. Use put to decrement the
 * refcount. Destroys when reaching 0. Use "get" to increment refcount.
 */
enum lttng_trace_chunk_status lttng_index_file_create_from_trace_chunk(
		struct lttng_trace_chunk *chunk,
		const char *channel_path, const char *stream_name,
		uint64_t stream_file_size, uint64_t stream_count,
		uint32_t index_major, uint32_t index_minor,
		bool unlink_existing_file, struct lttng_index_file **file);

enum lttng_trace_chunk_status lttng_index_file_create_from_trace_chunk_read_only(
		struct lttng_trace_chunk *chunk,
		const char *channel_path, const char *stream_name,
		uint64_t stream_file_size, uint64_t stream_file_index,
		uint32_t index_major, uint32_t index_minor,
		bool expect_no_file, struct lttng_index_file **file);

int lttng_index_file_write(const struct lttng_index_file *index_file,
		const struct ctf_packet_index *element);
int lttng_index_file_read(const struct lttng_index_file *index_file,
		struct ctf_packet_index *element);

void lttng_index_file_get(struct lttng_index_file *index_file);
void lttng_index_file_put(struct lttng_index_file *index_file);

#ifdef __cplusplus
}
#endif

#endif /* _INDEX_H */