[lttng-ust.git] / liblttng-ust / lttng-ring-buffer-metadata-client.h

/*
 * lttng-ring-buffer-client.h
 *
 * LTTng lib ring buffer client template.
 *
 * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; only
 * version 2.1 of the License.
 *
 * This library 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
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 */

#include <stdint.h>
#include <lttng/ust-events.h>
#include "lttng/bitfield.h"
#include "lttng-tracer.h"
#include "../libringbuffer/frontend_types.h"

struct metadata_packet_header {
	uint32_t magic;			/* 0x75D11D57 */
	uint8_t  uuid[LTTNG_UST_UUID_LEN]; /* Unique Universal Identifier */
	uint32_t checksum;		/* 0 if unused */
	uint32_t content_size;		/* in bits */
	uint32_t packet_size;		/* in bits */
	uint8_t  compression_scheme;	/* 0 if unused */
	uint8_t  encryption_scheme;	/* 0 if unused */
	uint8_t  checksum_scheme;	/* 0 if unused */
	uint8_t  major;			/* CTF spec major version number */
	uint8_t  minor;			/* CTF spec minor version number */
	uint8_t  header_end[0];
};

struct metadata_record_header {
	uint8_t header_end[0];		/* End of header */
};

static const struct lttng_ust_lib_ring_buffer_config client_config;

static inline uint64_t lib_ring_buffer_clock_read(struct channel *chan)
{
	return 0;
}

static inline
unsigned char record_header_size(const struct lttng_ust_lib_ring_buffer_config *config,
				 struct channel *chan, size_t offset,
				 size_t *pre_header_padding,
				 struct lttng_ust_lib_ring_buffer_ctx *ctx)
{
	return 0;
}

#include "../libringbuffer/api.h"

static uint64_t client_ring_buffer_clock_read(struct channel *chan)
{
	return 0;
}

static
size_t client_record_header_size(const struct lttng_ust_lib_ring_buffer_config *config,
				 struct channel *chan, size_t offset,
				 size_t *pre_header_padding,
				 struct lttng_ust_lib_ring_buffer_ctx *ctx)
{
	return 0;
}

/**
 * client_packet_header_size - called on buffer-switch to a new sub-buffer
 *
 * Return header size without padding after the structure. Don't use packed
 * structure because gcc generates inefficient code on some architectures
 * (powerpc, mips..)
 */
static size_t client_packet_header_size(void)
{
	return offsetof(struct metadata_packet_header, header_end);
}

static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc,
				unsigned int subbuf_idx,
				struct lttng_ust_shm_handle *handle)
{
	struct channel *chan = shmp(handle, buf->backend.chan);
	struct metadata_packet_header *header =
		(struct metadata_packet_header *)
			lib_ring_buffer_offset_address(&buf->backend,
				subbuf_idx * chan->backend.subbuf_size,
				handle);
	struct lttng_channel *lttng_chan = channel_get_private(chan);

	header->magic = TSDL_MAGIC_NUMBER;
	memcpy(header->uuid, lttng_chan->uuid, sizeof(lttng_chan->uuid));
	header->checksum = 0;		/* 0 if unused */
	header->content_size = 0xFFFFFFFF; /* in bits, for debugging */
	header->packet_size = 0xFFFFFFFF;  /* in bits, for debugging */
	header->compression_scheme = 0;	/* 0 if unused */
	header->encryption_scheme = 0;	/* 0 if unused */
	header->checksum_scheme = 0;	/* 0 if unused */
	header->major = CTF_SPEC_MAJOR;
	header->minor = CTF_SPEC_MINOR;
}

/*
 * offset is assumed to never be 0 here : never deliver a completely empty
 * subbuffer. data_size is between 1 and subbuf_size.
 */
static void client_buffer_end(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc,
			      unsigned int subbuf_idx, unsigned long data_size,
			      struct lttng_ust_shm_handle *handle)
{
	struct channel *chan = shmp(handle, buf->backend.chan);
	struct metadata_packet_header *header =
		(struct metadata_packet_header *)
			lib_ring_buffer_offset_address(&buf->backend,
				subbuf_idx * chan->backend.subbuf_size,
				handle);
	unsigned long records_lost = 0;

	header->content_size = data_size * CHAR_BIT;		/* in bits */
	header->packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */
	/*
	 * We do not care about the records lost count, because the metadata
	 * channel waits and retry.
	 */
	(void) lib_ring_buffer_get_records_lost_full(&client_config, buf);
	records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf);
	records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf);
	WARN_ON_ONCE(records_lost != 0);
}

static int client_buffer_create(struct lttng_ust_lib_ring_buffer *buf, void *priv,
				int cpu, const char *name,
				struct lttng_ust_shm_handle *handle)
{
	return 0;
}

static void client_buffer_finalize(struct lttng_ust_lib_ring_buffer *buf,
				   void *priv, int cpu,
				   struct lttng_ust_shm_handle *handle)
{
}

static const struct lttng_ust_lib_ring_buffer_config client_config = {
	.cb.ring_buffer_clock_read = client_ring_buffer_clock_read,
	.cb.record_header_size = client_record_header_size,
	.cb.subbuffer_header_size = client_packet_header_size,
	.cb.buffer_begin = client_buffer_begin,
	.cb.buffer_end = client_buffer_end,
	.cb.buffer_create = client_buffer_create,
	.cb.buffer_finalize = client_buffer_finalize,

	.tsc_bits = 0,
	.alloc = RING_BUFFER_ALLOC_GLOBAL,
	.sync = RING_BUFFER_SYNC_GLOBAL,
	.mode = RING_BUFFER_MODE_TEMPLATE,
	.backend = RING_BUFFER_PAGE,
	.output = RING_BUFFER_MMAP,
	.oops = RING_BUFFER_OOPS_CONSISTENCY,
	.ipi = RING_BUFFER_NO_IPI_BARRIER,
	.wakeup = RING_BUFFER_WAKEUP_BY_WRITER,
	.client_type = LTTNG_CLIENT_TYPE,
};

const struct lttng_ust_lib_ring_buffer_client_cb *LTTNG_CLIENT_CALLBACKS = &client_config.cb;

static
struct lttng_channel *_channel_create(const char *name,
				void *buf_addr,
				size_t subbuf_size, size_t num_subbuf,
				unsigned int switch_timer_interval,
				unsigned int read_timer_interval,
				unsigned char *uuid,
				uint32_t chan_id)
{
	struct lttng_channel chan_priv_init;
	struct lttng_ust_shm_handle *handle;
	struct lttng_channel *lttng_chan;
	void *priv;

	memset(&chan_priv_init, 0, sizeof(chan_priv_init));
	memcpy(chan_priv_init.uuid, uuid, LTTNG_UST_UUID_LEN);
	chan_priv_init.id = chan_id;
	handle = channel_create(&client_config, name,
			&priv, __alignof__(*lttng_chan), sizeof(*lttng_chan),
			&chan_priv_init,
			buf_addr, subbuf_size, num_subbuf,
			switch_timer_interval, read_timer_interval);
	if (!handle)
		return NULL;
	lttng_chan = priv;
	lttng_chan->handle = handle;
	lttng_chan->chan = shmp(handle, handle->chan);
	return lttng_chan;
}

static
void lttng_channel_destroy(struct lttng_channel *chan)
{
	channel_destroy(chan->chan, chan->handle, 1);
}

static
int lttng_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx, uint32_t event_id)
{
	return lib_ring_buffer_reserve(&client_config, ctx);
}

static
void lttng_event_commit(struct lttng_ust_lib_ring_buffer_ctx *ctx)
{
	lib_ring_buffer_commit(&client_config, ctx);
}

static
void lttng_event_write(struct lttng_ust_lib_ring_buffer_ctx *ctx, const void *src,
		     size_t len)
{
	lib_ring_buffer_write(&client_config, ctx, src, len);
}

static
size_t lttng_packet_avail_size(struct channel *chan, struct lttng_ust_shm_handle *handle)
			     
{
	unsigned long o_begin;
	struct lttng_ust_lib_ring_buffer *buf;

	buf = shmp(handle, chan->backend.buf[0].shmp);	/* Only for global buffer ! */
	o_begin = v_read(&client_config, &buf->offset);
	if (subbuf_offset(o_begin, chan) != 0) {
		return chan->backend.subbuf_size - subbuf_offset(o_begin, chan);
	} else {
		return chan->backend.subbuf_size - subbuf_offset(o_begin, chan)
			- sizeof(struct metadata_packet_header);
	}
}

#if 0
static
wait_queue_head_t *lttng_get_reader_wait_queue(struct channel *chan)
{
	return &chan->read_wait;
}

static
wait_queue_head_t *lttng_get_hp_wait_queue(struct channel *chan)
{
	return &chan->hp_wait;
}
#endif //0

static
int lttng_is_finalized(struct channel *chan)
{
	return lib_ring_buffer_channel_is_finalized(chan);
}

static
int lttng_is_disabled(struct channel *chan)
{
	return lib_ring_buffer_channel_is_disabled(chan);
}

static
int lttng_flush_buffer(struct channel *chan, struct lttng_ust_shm_handle *handle)
{
	struct lttng_ust_lib_ring_buffer *buf;
	int shm_fd, wait_fd, wakeup_fd;
	uint64_t memory_map_size;

	buf = channel_get_ring_buffer(&client_config, chan,
			0, handle, &shm_fd, &wait_fd, &wakeup_fd,
			&memory_map_size);
	lib_ring_buffer_switch(&client_config, buf,
			SWITCH_ACTIVE, handle);
	return 0;
}

static struct lttng_transport lttng_relay_transport = {
	.name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap",
	.ops = {
		.channel_create = _channel_create,
		.channel_destroy = lttng_channel_destroy,
		.event_reserve = lttng_event_reserve,
		.event_commit = lttng_event_commit,
		.event_write = lttng_event_write,
		.packet_avail_size = lttng_packet_avail_size,
		//.get_reader_wait_queue = lttng_get_reader_wait_queue,
		//.get_hp_wait_queue = lttng_get_hp_wait_queue,
		.is_finalized = lttng_is_finalized,
		.is_disabled = lttng_is_disabled,
		.flush_buffer = lttng_flush_buffer,
	},
	.client_config = &client_config,
};

void RING_BUFFER_MODE_TEMPLATE_INIT(void)
{
	DBG("LTT : ltt ring buffer client \"%s\" init\n",
		"relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap");
	lttng_transport_register(&lttng_relay_transport);
}

void RING_BUFFER_MODE_TEMPLATE_EXIT(void)
{
	DBG("LTT : ltt ring buffer client \"%s\" exit\n",
		"relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap");
	lttng_transport_unregister(&lttng_relay_transport);
}
Commit	Line	Data
	1	/*
	2	* lttng-ring-buffer-client.h
	3	*
	4	* LTTng lib ring buffer client template.
	5	*
	6	* Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	7	*
	8	* This library is free software; you can redistribute it and/or
	9	* modify it under the terms of the GNU Lesser General Public
	10	* License as published by the Free Software Foundation; only
	11	* version 2.1 of the License.
	12	*
	13	* This library is distributed in the hope that it will be useful,
	14	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	15	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
	16	* Lesser General Public License for more details.
	17	*
	18	* You should have received a copy of the GNU Lesser General Public
	19	* License along with this library; if not, write to the Free Software
	20	* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
	21	*/
	22
	23	#include <stdint.h>
	24	#include <lttng/ust-events.h>
	25	#include "lttng/bitfield.h"
	26	#include "lttng-tracer.h"
	27	#include "../libringbuffer/frontend_types.h"
	28
	29	struct metadata_packet_header {
	30	uint32_t magic; /* 0x75D11D57 */
	31	uint8_t uuid[LTTNG_UST_UUID_LEN]; /* Unique Universal Identifier */
	32	uint32_t checksum; /* 0 if unused */
	33	uint32_t content_size; /* in bits */
	34	uint32_t packet_size; /* in bits */
	35	uint8_t compression_scheme; /* 0 if unused */
	36	uint8_t encryption_scheme; /* 0 if unused */
	37	uint8_t checksum_scheme; /* 0 if unused */
	38	uint8_t major; /* CTF spec major version number */
	39	uint8_t minor; /* CTF spec minor version number */
	40	uint8_t header_end[0];
	41	};
	42
	43	struct metadata_record_header {
	44	uint8_t header_end[0]; /* End of header */
	45	};
	46
	47	static const struct lttng_ust_lib_ring_buffer_config client_config;
	48
	49	static inline uint64_t lib_ring_buffer_clock_read(struct channel *chan)
	50	{
	51	return 0;
	52	}
	53
	54	static inline
	55	unsigned char record_header_size(const struct lttng_ust_lib_ring_buffer_config *config,
	56	struct channel *chan, size_t offset,
	57	size_t *pre_header_padding,
	58	struct lttng_ust_lib_ring_buffer_ctx *ctx)
	59	{
	60	return 0;
	61	}
	62
	63	#include "../libringbuffer/api.h"
	64
	65	static uint64_t client_ring_buffer_clock_read(struct channel *chan)
	66	{
	67	return 0;
	68	}
	69
	70	static
	71	size_t client_record_header_size(const struct lttng_ust_lib_ring_buffer_config *config,
	72	struct channel *chan, size_t offset,
	73	size_t *pre_header_padding,
	74	struct lttng_ust_lib_ring_buffer_ctx *ctx)
	75	{
	76	return 0;
	77	}
	78
	79	/**
	80	* client_packet_header_size - called on buffer-switch to a new sub-buffer
	81	*
	82	* Return header size without padding after the structure. Don't use packed
	83	* structure because gcc generates inefficient code on some architectures
	84	* (powerpc, mips..)
	85	*/
	86	static size_t client_packet_header_size(void)
	87	{
	88	return offsetof(struct metadata_packet_header, header_end);
	89	}
	90
	91	static void client_buffer_begin(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc,
	92	unsigned int subbuf_idx,
	93	struct lttng_ust_shm_handle *handle)
	94	{
	95	struct channel *chan = shmp(handle, buf->backend.chan);
	96	struct metadata_packet_header *header =
	97	(struct metadata_packet_header *)
	98	lib_ring_buffer_offset_address(&buf->backend,
	99	subbuf_idx * chan->backend.subbuf_size,
	100	handle);
	101	struct lttng_channel *lttng_chan = channel_get_private(chan);
	102
	103	header->magic = TSDL_MAGIC_NUMBER;
	104	memcpy(header->uuid, lttng_chan->uuid, sizeof(lttng_chan->uuid));
	105	header->checksum = 0; /* 0 if unused */
	106	header->content_size = 0xFFFFFFFF; /* in bits, for debugging */
	107	header->packet_size = 0xFFFFFFFF; /* in bits, for debugging */
	108	header->compression_scheme = 0; /* 0 if unused */
	109	header->encryption_scheme = 0; /* 0 if unused */
	110	header->checksum_scheme = 0; /* 0 if unused */
	111	header->major = CTF_SPEC_MAJOR;
	112	header->minor = CTF_SPEC_MINOR;
	113	}
	114
	115	/*
	116	* offset is assumed to never be 0 here : never deliver a completely empty
	117	* subbuffer. data_size is between 1 and subbuf_size.
	118	*/
	119	static void client_buffer_end(struct lttng_ust_lib_ring_buffer *buf, uint64_t tsc,
	120	unsigned int subbuf_idx, unsigned long data_size,
	121	struct lttng_ust_shm_handle *handle)
	122	{
	123	struct channel *chan = shmp(handle, buf->backend.chan);
	124	struct metadata_packet_header *header =
	125	(struct metadata_packet_header *)
	126	lib_ring_buffer_offset_address(&buf->backend,
	127	subbuf_idx * chan->backend.subbuf_size,
	128	handle);
	129	unsigned long records_lost = 0;
	130
	131	header->content_size = data_size * CHAR_BIT; /* in bits */
	132	header->packet_size = PAGE_ALIGN(data_size) * CHAR_BIT; /* in bits */
	133	/*
	134	* We do not care about the records lost count, because the metadata
	135	* channel waits and retry.
	136	*/
	137	(void) lib_ring_buffer_get_records_lost_full(&client_config, buf);
	138	records_lost += lib_ring_buffer_get_records_lost_wrap(&client_config, buf);
	139	records_lost += lib_ring_buffer_get_records_lost_big(&client_config, buf);
	140	WARN_ON_ONCE(records_lost != 0);
	141	}
	142
	143	static int client_buffer_create(struct lttng_ust_lib_ring_buffer buf, void priv,
	144	int cpu, const char *name,
	145	struct lttng_ust_shm_handle *handle)
	146	{
	147	return 0;
	148	}
	149
	150	static void client_buffer_finalize(struct lttng_ust_lib_ring_buffer *buf,
	151	void *priv, int cpu,
	152	struct lttng_ust_shm_handle *handle)
	153	{
	154	}
	155
	156	static const struct lttng_ust_lib_ring_buffer_config client_config = {
	157	.cb.ring_buffer_clock_read = client_ring_buffer_clock_read,
	158	.cb.record_header_size = client_record_header_size,
	159	.cb.subbuffer_header_size = client_packet_header_size,
	160	.cb.buffer_begin = client_buffer_begin,
	161	.cb.buffer_end = client_buffer_end,
	162	.cb.buffer_create = client_buffer_create,
	163	.cb.buffer_finalize = client_buffer_finalize,
	164
	165	.tsc_bits = 0,
	166	.alloc = RING_BUFFER_ALLOC_GLOBAL,
	167	.sync = RING_BUFFER_SYNC_GLOBAL,
	168	.mode = RING_BUFFER_MODE_TEMPLATE,
	169	.backend = RING_BUFFER_PAGE,
	170	.output = RING_BUFFER_MMAP,
	171	.oops = RING_BUFFER_OOPS_CONSISTENCY,
	172	.ipi = RING_BUFFER_NO_IPI_BARRIER,
	173	.wakeup = RING_BUFFER_WAKEUP_BY_WRITER,
	174	.client_type = LTTNG_CLIENT_TYPE,
	175	};
	176
	177	const struct lttng_ust_lib_ring_buffer_client_cb *LTTNG_CLIENT_CALLBACKS = &client_config.cb;
	178
	179	static
	180	struct lttng_channel _channel_create(const char name,
	181	void *buf_addr,
	182	size_t subbuf_size, size_t num_subbuf,
	183	unsigned int switch_timer_interval,
	184	unsigned int read_timer_interval,
	185	unsigned char *uuid,
	186	uint32_t chan_id)
	187	{
	188	struct lttng_channel chan_priv_init;
	189	struct lttng_ust_shm_handle *handle;
	190	struct lttng_channel *lttng_chan;
	191	void *priv;
	192
	193	memset(&chan_priv_init, 0, sizeof(chan_priv_init));
	194	memcpy(chan_priv_init.uuid, uuid, LTTNG_UST_UUID_LEN);
	195	chan_priv_init.id = chan_id;
	196	handle = channel_create(&client_config, name,
	197	&priv, __alignof__(lttng_chan), sizeof(lttng_chan),
	198	&chan_priv_init,
	199	buf_addr, subbuf_size, num_subbuf,
	200	switch_timer_interval, read_timer_interval);
	201	if (!handle)
	202	return NULL;
	203	lttng_chan = priv;
	204	lttng_chan->handle = handle;
	205	lttng_chan->chan = shmp(handle, handle->chan);
	206	return lttng_chan;
	207	}
	208
	209	static
	210	void lttng_channel_destroy(struct lttng_channel *chan)
	211	{
	212	channel_destroy(chan->chan, chan->handle, 1);
	213	}
	214
	215	static
	216	int lttng_event_reserve(struct lttng_ust_lib_ring_buffer_ctx *ctx, uint32_t event_id)
	217	{
	218	return lib_ring_buffer_reserve(&client_config, ctx);
	219	}
	220
	221	static
	222	void lttng_event_commit(struct lttng_ust_lib_ring_buffer_ctx *ctx)
	223	{
	224	lib_ring_buffer_commit(&client_config, ctx);
	225	}
	226
	227	static
	228	void lttng_event_write(struct lttng_ust_lib_ring_buffer_ctx ctx, const void src,
	229	size_t len)
	230	{
	231	lib_ring_buffer_write(&client_config, ctx, src, len);
	232	}
	233
	234	static
	235	size_t lttng_packet_avail_size(struct channel chan, struct lttng_ust_shm_handle handle)
	236
	237	{
	238	unsigned long o_begin;
	239	struct lttng_ust_lib_ring_buffer *buf;
	240
	241	buf = shmp(handle, chan->backend.buf[0].shmp); /* Only for global buffer ! */
	242	o_begin = v_read(&client_config, &buf->offset);
	243	if (subbuf_offset(o_begin, chan) != 0) {
	244	return chan->backend.subbuf_size - subbuf_offset(o_begin, chan);
	245	} else {
	246	return chan->backend.subbuf_size - subbuf_offset(o_begin, chan)
	247	- sizeof(struct metadata_packet_header);
	248	}
	249	}
	250
	251	#if 0
	252	static
	253	wait_queue_head_t lttng_get_reader_wait_queue(struct channel chan)
	254	{
	255	return &chan->read_wait;
	256	}
	257
	258	static
	259	wait_queue_head_t lttng_get_hp_wait_queue(struct channel chan)
	260	{
	261	return &chan->hp_wait;
	262	}
	263	#endif //0
	264
	265	static
	266	int lttng_is_finalized(struct channel *chan)
	267	{
	268	return lib_ring_buffer_channel_is_finalized(chan);
	269	}
	270
	271	static
	272	int lttng_is_disabled(struct channel *chan)
	273	{
	274	return lib_ring_buffer_channel_is_disabled(chan);
	275	}
	276
	277	static
	278	int lttng_flush_buffer(struct channel chan, struct lttng_ust_shm_handle handle)
	279	{
	280	struct lttng_ust_lib_ring_buffer *buf;
	281	int shm_fd, wait_fd, wakeup_fd;
	282	uint64_t memory_map_size;
	283
	284	buf = channel_get_ring_buffer(&client_config, chan,
	285	0, handle, &shm_fd, &wait_fd, &wakeup_fd,
	286	&memory_map_size);
	287	lib_ring_buffer_switch(&client_config, buf,
	288	SWITCH_ACTIVE, handle);
	289	return 0;
	290	}
	291
	292	static struct lttng_transport lttng_relay_transport = {
	293	.name = "relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap",
	294	.ops = {
	295	.channel_create = _channel_create,
	296	.channel_destroy = lttng_channel_destroy,
	297	.event_reserve = lttng_event_reserve,
	298	.event_commit = lttng_event_commit,
	299	.event_write = lttng_event_write,
	300	.packet_avail_size = lttng_packet_avail_size,
	301	//.get_reader_wait_queue = lttng_get_reader_wait_queue,
	302	//.get_hp_wait_queue = lttng_get_hp_wait_queue,
	303	.is_finalized = lttng_is_finalized,
	304	.is_disabled = lttng_is_disabled,
	305	.flush_buffer = lttng_flush_buffer,
	306	},
	307	.client_config = &client_config,
	308	};
	309
	310	void RING_BUFFER_MODE_TEMPLATE_INIT(void)
	311	{
	312	DBG("LTT : ltt ring buffer client \"%s\" init\n",
	313	"relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap");
	314	lttng_transport_register(&lttng_relay_transport);
	315	}
	316
	317	void RING_BUFFER_MODE_TEMPLATE_EXIT(void)
	318	{
	319	DBG("LTT : ltt ring buffer client \"%s\" exit\n",
	320	"relay-" RING_BUFFER_MODE_TEMPLATE_STRING "-mmap");
	321	lttng_transport_unregister(&lttng_relay_transport);
	322	}