[lttng-tools.git] / src / bin / lttng-sessiond / trace-kernel.h

/*
 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License, version 2 only,
 * as published by the Free Software Foundation.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License along
 * with this program; if not, write to the Free Software Foundation, Inc.,
 * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
 */

#ifndef _LTT_TRACE_KERNEL_H
#define _LTT_TRACE_KERNEL_H

#include <urcu/list.h>

#include <lttng/lttng.h>
#include <common/lttng-kernel.h>
#include <common/lttng-kernel-old.h>
#include <common/defaults.h>

#include "consumer.h"

/* Kernel event list */
struct ltt_kernel_event_list {
	struct cds_list_head head;
};

/* Channel stream list */
struct ltt_kernel_stream_list {
	struct cds_list_head head;
};

/* Channel list */
struct ltt_kernel_channel_list {
	struct cds_list_head head;
};

/* Kernel event */
struct ltt_kernel_event {
	int fd;
	int enabled;
	struct lttng_kernel_event *event;
	struct cds_list_head list;
};

/* Kernel channel */
struct ltt_kernel_channel {
	int fd;
	int enabled;
	unsigned int stream_count;
	unsigned int event_count;
	/*
	 * TODO: need internal representation to support more than a
	 * single context.
	 */
	struct lttng_kernel_context *ctx;
	struct lttng_channel *channel;
	struct ltt_kernel_event_list events_list;
	struct ltt_kernel_stream_list stream_list;
	struct cds_list_head list;
	/* Session pointer which has a reference to this object. */
	struct ltt_kernel_session *session;
};

/* Metadata */
struct ltt_kernel_metadata {
	int fd;
	struct lttng_channel *conf;
};

/* Channel stream */
struct ltt_kernel_stream {
	int fd;
	int state;
	int cpu;
	/* Format is %s_%d respectively channel name and CPU number. */
	char name[DEFAULT_STREAM_NAME_LEN];
	uint64_t tracefile_size;
	uint64_t tracefile_count;
	struct cds_list_head list;
};

/* Kernel session */
struct ltt_kernel_session {
	int fd;
	int metadata_stream_fd;
	int consumer_fds_sent;
	unsigned int channel_count;
	unsigned int stream_count_global;
	struct ltt_kernel_metadata *metadata;
	struct ltt_kernel_channel_list channel_list;
	/* UID/GID of the user owning the session */
	uid_t uid;
	gid_t gid;
	/*
	 * Two consumer_output object are needed where one is needed for the
	 * current output object and the second one is the temporary object used to
	 * store URI being set by the lttng_set_consumer_uri call. Once
	 * lttng_enable_consumer is called, the two pointers are swapped.
	 */
	struct consumer_output *consumer;
	struct consumer_output *tmp_consumer;
	/* Tracing session id */
	uint64_t id;
	/* Session is started and active */
	unsigned int started;
	/* Tell or not if the session has to output the traces. */
	unsigned int output_traces;
	unsigned int snapshot_mode;
	unsigned int has_non_default_channel;
};

/*
 * Lookup functions. NULL is returned if not found.
 */
struct ltt_kernel_event *trace_kernel_get_event_by_name(
		char *name, struct ltt_kernel_channel *channel);
struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
		char *name, struct ltt_kernel_session *session);

/*
 * Create functions malloc() the data structure.
 */
struct ltt_kernel_session *trace_kernel_create_session(void);
struct ltt_kernel_channel *trace_kernel_create_channel(
		struct lttng_channel *chan);
struct ltt_kernel_event *trace_kernel_create_event(struct lttng_event *ev);
struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
struct ltt_kernel_stream *trace_kernel_create_stream(const char *name,
		unsigned int count);

/*
 * Destroy functions free() the data structure and remove from linked list if
 * it's applies.
 */
void trace_kernel_destroy_session(struct ltt_kernel_session *session);
void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
void trace_kernel_destroy_event(struct ltt_kernel_event *event);
void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);

#endif /* _LTT_TRACE_KERNEL_H */
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
	3	*
	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License, version 2 only,
	6	* as published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along
	14	* with this program; if not, write to the Free Software Foundation, Inc.,
	15	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	16	*/
	17
	18	#ifndef _LTT_TRACE_KERNEL_H
	19	#define _LTT_TRACE_KERNEL_H
	20
	21	#include <urcu/list.h>
	22
	23	#include <lttng/lttng.h>
	24	#include <common/lttng-kernel.h>
	25	#include <common/lttng-kernel-old.h>
	26	#include <common/defaults.h>
	27
	28	#include "consumer.h"
	29
	30	/* Kernel event list */
	31	struct ltt_kernel_event_list {
	32	struct cds_list_head head;
	33	};
	34
	35	/* Channel stream list */
	36	struct ltt_kernel_stream_list {
	37	struct cds_list_head head;
	38	};
	39
	40	/* Channel list */
	41	struct ltt_kernel_channel_list {
	42	struct cds_list_head head;
	43	};
	44
	45	/* Kernel event */
	46	struct ltt_kernel_event {
	47	int fd;
	48	int enabled;
	49	struct lttng_kernel_event *event;
	50	struct cds_list_head list;
	51	};
	52
	53	/* Kernel channel */
	54	struct ltt_kernel_channel {
	55	int fd;
	56	int enabled;
	57	unsigned int stream_count;
	58	unsigned int event_count;
	59	/*
	60	* TODO: need internal representation to support more than a
	61	* single context.
	62	*/
	63	struct lttng_kernel_context *ctx;
	64	struct lttng_channel *channel;
	65	struct ltt_kernel_event_list events_list;
	66	struct ltt_kernel_stream_list stream_list;
	67	struct cds_list_head list;
	68	/* Session pointer which has a reference to this object. */
	69	struct ltt_kernel_session *session;
	70	};
	71
	72	/* Metadata */
	73	struct ltt_kernel_metadata {
	74	int fd;
	75	struct lttng_channel *conf;
	76	};
	77
	78	/* Channel stream */
	79	struct ltt_kernel_stream {
	80	int fd;
	81	int state;
	82	int cpu;
	83	/* Format is %s_%d respectively channel name and CPU number. */
	84	char name[DEFAULT_STREAM_NAME_LEN];
	85	uint64_t tracefile_size;
	86	uint64_t tracefile_count;
	87	struct cds_list_head list;
	88	};
	89
	90	/* Kernel session */
	91	struct ltt_kernel_session {
	92	int fd;
	93	int metadata_stream_fd;
	94	int consumer_fds_sent;
	95	unsigned int channel_count;
	96	unsigned int stream_count_global;
	97	struct ltt_kernel_metadata *metadata;
	98	struct ltt_kernel_channel_list channel_list;
	99	/* UID/GID of the user owning the session */
	100	uid_t uid;
	101	gid_t gid;
	102	/*
	103	* Two consumer_output object are needed where one is needed for the
	104	* current output object and the second one is the temporary object used to
	105	* store URI being set by the lttng_set_consumer_uri call. Once
	106	* lttng_enable_consumer is called, the two pointers are swapped.
	107	*/
	108	struct consumer_output *consumer;
	109	struct consumer_output *tmp_consumer;
	110	/* Tracing session id */
	111	uint64_t id;
	112	/* Session is started and active */
	113	unsigned int started;
	114	/* Tell or not if the session has to output the traces. */
	115	unsigned int output_traces;
	116	unsigned int snapshot_mode;
	117	unsigned int has_non_default_channel;
	118	};
	119
	120	/*
	121	* Lookup functions. NULL is returned if not found.
	122	*/
	123	struct ltt_kernel_event *trace_kernel_get_event_by_name(
	124	char name, struct ltt_kernel_channel channel);
	125	struct ltt_kernel_channel *trace_kernel_get_channel_by_name(
	126	char name, struct ltt_kernel_session session);
	127
	128	/*
	129	* Create functions malloc() the data structure.
	130	*/
	131	struct ltt_kernel_session *trace_kernel_create_session(void);
	132	struct ltt_kernel_channel *trace_kernel_create_channel(
	133	struct lttng_channel *chan);
	134	struct ltt_kernel_event trace_kernel_create_event(struct lttng_event ev);
	135	struct ltt_kernel_metadata *trace_kernel_create_metadata(void);
	136	struct ltt_kernel_stream trace_kernel_create_stream(const char name,
	137	unsigned int count);
	138
	139	/*
	140	* Destroy functions free() the data structure and remove from linked list if
	141	* it's applies.
	142	*/
	143	void trace_kernel_destroy_session(struct ltt_kernel_session *session);
	144	void trace_kernel_destroy_metadata(struct ltt_kernel_metadata *metadata);
	145	void trace_kernel_destroy_channel(struct ltt_kernel_channel *channel);
	146	void trace_kernel_destroy_event(struct ltt_kernel_event *event);
	147	void trace_kernel_destroy_stream(struct ltt_kernel_stream *stream);
	148
	149	#endif /* _LTT_TRACE_KERNEL_H */