[lttng-tools.git] / ltt-sessiond / trace-ust.c

/*
 * 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 as published by the Free
 * Software Foundation; only version 2 of the License.
 *
 * 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., 59 Temple
 * Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#define _GNU_SOURCE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <lttngerr.h>
#include <lttng-share.h>

#include "trace-ust.h"

/*
 * Using a ust session list, it will return the session corresponding to the
 * pid. Must be a session of domain LTTNG_DOMAIN_UST_PID.
 */
struct ltt_ust_session *trace_ust_get_session_by_pid(
		struct ltt_ust_session_list *session_list, pid_t pid)
{
	struct ltt_ust_session *sess;

	if (session_list == NULL) {
		ERR("Session list is NULL");
		goto error;
	}

	cds_list_for_each_entry(sess, &session_list->head, list) {
		if (sess->domain.type == LTTNG_DOMAIN_UST_PID &&
				sess->domain.attr.pid == pid) {
			DBG2("Trace UST session found by pid %d", pid);
			return sess;
		}
	}

error:
	return NULL;
}

/*
 * Find the channel name for the given ust session.
 */
struct ltt_ust_channel *trace_ust_get_channel_by_name(
		char *name, struct ltt_ust_session *session)
{
	struct ltt_ust_channel *chan;

	if (session == NULL) {
		ERR("Undefine session");
		goto error;
	}

	cds_list_for_each_entry(chan, &session->channels.head, list) {
		if (strcmp(name, chan->name) == 0) {
			DBG2("Found UST channel by name %s", name);
			return chan;
		}
	}

error:
	return NULL;
}

/*
 * Find the event name for the given channel.
 */
struct ltt_ust_event *trace_ust_get_event_by_name(
		char *name, struct ltt_ust_channel *channel)
{
	struct ltt_ust_event *ev;

	if (channel == NULL) {
		ERR("Undefine channel");
		goto error;
	}

	cds_list_for_each_entry(ev, &channel->events.head, list) {
		if (strcmp(name, ev->attr.name) == 0) {
			DBG("Found UST event by name %s for channel %s", name,
					channel->name);
			return ev;
		}
	}

error:
	return NULL;
}

/*
 * Allocate and initialize a ust session data structure.
 *
 * Return pointer to structure or NULL.
 */
struct ltt_ust_session *trace_ust_create_session(char *path, pid_t pid,
		struct lttng_domain *domain)
{
	int ret;
	struct ltt_ust_session *lus;

	/* Allocate a new ltt ust session */
	lus = malloc(sizeof(struct ltt_ust_session));
	if (lus == NULL) {
		perror("create ust session malloc");
		goto error;
	}

	/* Init data structure */
	lus->handle = -1;
	lus->enabled = 1;
	lus->consumer_fds_sent = 0;
	lus->metadata = NULL;
	lus->channels.count = 0;
	CDS_INIT_LIST_HEAD(&lus->channels.head);

	/* Copy lttng_domain */
	memcpy(&lus->domain, domain, sizeof(struct lttng_domain));

	/* Set session path */
	ret = snprintf(lus->path, PATH_MAX, "%s/ust_%d", path, pid);
	if (ret < 0) {
		PERROR("snprintf kernel traces path");
		goto error;
	}

	DBG2("UST trace session create successful");

	return lus;

error:
	return NULL;
}

/*
 * Allocate and initialize a ust channel data structure.
 *
 * Return pointer to structure or NULL.
 */
struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan,
		char *path)
{
	int ret;
	struct ltt_ust_channel *luc;

	luc = malloc(sizeof(struct ltt_ust_channel));
	if (luc == NULL) {
		perror("ltt_ust_channel malloc");
		goto error;
	}

	/* Copy UST channel attributes */
	memcpy(&luc->attr, &chan->attr, sizeof(struct lttng_ust_channel));

	/* Translate to UST output enum */
	switch (luc->attr.output) {
	default:
		luc->attr.output = LTTNG_UST_MMAP;
		break;
	}

	luc->handle = -1;
	luc->enabled = 1;
	luc->events.count = 0;
	CDS_INIT_LIST_HEAD(&luc->events.head);

	memset(&luc->ctx, 0, sizeof(struct lttng_ust_context));

	/* Copy channel name */
	strncpy(luc->name, chan->name, sizeof(&luc->name));
	luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';

	/* Set trace output path */
	ret = snprintf(luc->trace_path, PATH_MAX, "%s", path);
	if (ret < 0) {
		perror("asprintf ust create channel");
		goto error;
	}

	return luc;

error:
	return NULL;
}

/*
 * Allocate and initialize a ust event. Set name and event type.
 *
 * Return pointer to structure or NULL.
 */
struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev)
{
	struct ltt_ust_event *lue;

	lue = malloc(sizeof(struct ltt_ust_event));
	if (lue == NULL) {
		PERROR("ust event malloc");
		goto error;
	}

	switch (ev->type) {
	case LTTNG_EVENT_PROBE:
		lue->attr.instrumentation = LTTNG_UST_PROBE;
		break;
	case LTTNG_EVENT_FUNCTION:
		lue->attr.instrumentation = LTTNG_UST_FUNCTION;
		break;
	case LTTNG_EVENT_FUNCTION_ENTRY:
		lue->attr.instrumentation = LTTNG_UST_FUNCTION;
		break;
	case LTTNG_EVENT_TRACEPOINT:
		lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
		break;
	default:
		ERR("Unknown ust instrumentation type (%d)", ev->type);
		goto error;
	}

	/* Copy event name */
	strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
	lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';

	/* Setting up a ust event */
	lue->handle = -1;
	lue->enabled = 1;
	memset(&lue->ctx, 0, sizeof(struct lttng_ust_context));

	return lue;

error:
	return NULL;
}

/*
 * Allocate and initialize a ust metadata.
 *
 * Return pointer to structure or NULL.
 */
struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
{
	int ret;
	struct ltt_ust_metadata *lum;

	lum = malloc(sizeof(struct ltt_ust_metadata));
	if (lum == NULL) {
		perror("ust metadata malloc");
		goto error;
	}

	/* Set default attributes */
	lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
	lum->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
	lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
	lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
	lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
	lum->attr.output = DEFAULT_UST_CHANNEL_OUTPUT;

	lum->handle = -1;
	/* Set metadata trace path */
	ret = asprintf(&lum->trace_path, "%s/metadata", path);
	if (ret < 0) {
		perror("asprintf ust metadata");
		goto error;
	}

	return lum;

error:
	return NULL;
}

/*
 * Cleanup ust event structure.
 */
void trace_ust_destroy_event(struct ltt_ust_event *event)
{
	DBG("[trace] Destroy ust event %s", event->attr.name);

	/* Remove from event list */
	cds_list_del(&event->list);
	free(event);
}

/*
 * Cleanup ust channel structure.
 */
void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
{
	struct ltt_ust_event *event, *etmp;

	DBG("[trace] Destroy ust channel %d", channel->handle);

	/* For each event in the channel list */
	cds_list_for_each_entry_safe(event, etmp, &channel->events.head, list) {
		trace_ust_destroy_event(event);
	}

	/* Remove from channel list */
	cds_list_del(&channel->list);
	free(channel);
}

/*
 * Cleanup ust metadata structure.
 */
void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
{
	DBG("[trace] Destroy ust metadata %d", metadata->handle);

	/* Free attributes */
	free(metadata->trace_path);

	free(metadata);
}

/*
 * Cleanup ust session structure
 */
void trace_ust_destroy_session(struct ltt_ust_session *session)
{
	struct ltt_ust_channel *channel, *ctmp;

	DBG("[trace] Destroy ust session %d", session->handle);

	/* Extra safety */
	if (session == NULL) {
		return;
	}

	if (session->metadata != NULL) {
		trace_ust_destroy_metadata(session->metadata);
	}

	cds_list_for_each_entry_safe(channel, ctmp, &session->channels.head, list) {
		trace_ust_destroy_channel(channel);
	}

	if (session->path) {
		free(session->path);
	}

	free(session);
}
Commit	Line	Data
97ee3a89 DG	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 it
	5	* under the terms of the GNU General Public License as published by the Free
	6	* Software Foundation; only version 2 of the License.
	7	*
	8	* This program is distributed in the hope that it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
	15	* Place - Suite 330, Boston, MA 02111-1307, USA.
	16	*/
	17
	18	#define _GNU_SOURCE
	19	#include <stdio.h>
	20	#include <stdlib.h>
	21	#include <string.h>
	22	#include <unistd.h>
	23
	24	#include <lttngerr.h>
	25	#include <lttng-share.h>
	26
	27	#include "trace-ust.h"
	28
0177d773	29	/*
44d3bd01 DG	30	* Using a ust session list, it will return the session corresponding to the
44d3bd01 DG	31	* pid. Must be a session of domain LTTNG_DOMAIN_UST_PID.
0177d773	32	*/
44d3bd01 DG	33	struct ltt_ust_session *trace_ust_get_session_by_pid(
44d3bd01 DG	34	struct ltt_ust_session_list *session_list, pid_t pid)
0177d773	35	{
44d3bd01	36	struct ltt_ust_session *sess;
0177d773	37
44d3bd01 DG	38	if (session_list == NULL) {
	39	ERR("Session list is NULL");
	40	goto error;
	41	}
	42
	43	cds_list_for_each_entry(sess, &session_list->head, list) {
	44	if (sess->domain.type == LTTNG_DOMAIN_UST_PID &&
	45	sess->domain.attr.pid == pid) {
	46	DBG2("Trace UST session found by pid %d", pid);
	47	return sess;
0177d773 DG	48	}
	49	}
	50
44d3bd01	51	error:
0177d773 DG	52	return NULL;
	53	}
	54
97ee3a89 DG	55	/*
	56	* Find the channel name for the given ust session.
	57	*/
	58	struct ltt_ust_channel *trace_ust_get_channel_by_name(
	59	char name, struct ltt_ust_session session)
	60	{
	61	struct ltt_ust_channel *chan;
	62
	63	if (session == NULL) {
	64	ERR("Undefine session");
	65	goto error;
	66	}
	67
	68	cds_list_for_each_entry(chan, &session->channels.head, list) {
	69	if (strcmp(name, chan->name) == 0) {
44d3bd01	70	DBG2("Found UST channel by name %s", name);
97ee3a89 DG	71	return chan;
	72	}
	73	}
	74
	75	error:
	76	return NULL;
	77	}
	78
	79	/*
	80	* Find the event name for the given channel.
	81	*/
	82	struct ltt_ust_event *trace_ust_get_event_by_name(
	83	char name, struct ltt_ust_channel channel)
	84	{
	85	struct ltt_ust_event *ev;
	86
	87	if (channel == NULL) {
	88	ERR("Undefine channel");
	89	goto error;
	90	}
	91
	92	cds_list_for_each_entry(ev, &channel->events.head, list) {
44d3bd01	93	if (strcmp(name, ev->attr.name) == 0) {
97ee3a89 DG	94	DBG("Found UST event by name %s for channel %s", name,
	95	channel->name);
	96	return ev;
	97	}
	98	}
	99
	100	error:
	101	return NULL;
	102	}
	103
	104	/*
	105	* Allocate and initialize a ust session data structure.
	106	*
	107	* Return pointer to structure or NULL.
	108	*/
44d3bd01 DG	109	struct ltt_ust_session trace_ust_create_session(char path, pid_t pid,
44d3bd01 DG	110	struct lttng_domain *domain)
97ee3a89	111	{
0177d773	112	int ret;
97ee3a89 DG	113	struct ltt_ust_session *lus;
	114
	115	/* Allocate a new ltt ust session */
	116	lus = malloc(sizeof(struct ltt_ust_session));
	117	if (lus == NULL) {
	118	perror("create ust session malloc");
	119	goto error;
	120	}
	121
	122	/* Init data structure */
	123	lus->handle = -1;
	124	lus->enabled = 1;
3bd1e081	125	lus->consumer_fds_sent = 0;
97ee3a89 DG	126	lus->metadata = NULL;
	127	lus->channels.count = 0;
	128	CDS_INIT_LIST_HEAD(&lus->channels.head);
	129
44d3bd01 DG	130	/* Copy lttng_domain */
	131	memcpy(&lus->domain, domain, sizeof(struct lttng_domain));
	132
0177d773	133	/* Set session path */
44d3bd01	134	ret = snprintf(lus->path, PATH_MAX, "%s/ust_%d", path, pid);
0177d773	135	if (ret < 0) {
44d3bd01	136	PERROR("snprintf kernel traces path");
0177d773 DG	137	goto error;
	138	}
	139
44d3bd01 DG	140	DBG2("UST trace session create successful");
44d3bd01 DG	141
97ee3a89 DG	142	return lus;
	143
	144	error:
	145	return NULL;
	146	}
	147
	148	/*
	149	* Allocate and initialize a ust channel data structure.
	150	*
	151	* Return pointer to structure or NULL.
	152	*/
44d3bd01 DG	153	struct ltt_ust_channel trace_ust_create_channel(struct lttng_channel chan,
44d3bd01 DG	154	char *path)
97ee3a89 DG	155	{
	156	int ret;
	157	struct ltt_ust_channel *luc;
	158
	159	luc = malloc(sizeof(struct ltt_ust_channel));
	160	if (luc == NULL) {
	161	perror("ltt_ust_channel malloc");
	162	goto error;
	163	}
	164
44d3bd01 DG	165	/* Copy UST channel attributes */
	166	memcpy(&luc->attr, &chan->attr, sizeof(struct lttng_ust_channel));
	167
	168	/* Translate to UST output enum */
	169	switch (luc->attr.output) {
	170	default:
	171	luc->attr.output = LTTNG_UST_MMAP;
	172	break;
97ee3a89	173	}
97ee3a89 DG	174
	175	luc->handle = -1;
	176	luc->enabled = 1;
97ee3a89 DG	177	luc->events.count = 0;
	178	CDS_INIT_LIST_HEAD(&luc->events.head);
	179
44d3bd01 DG	180	memset(&luc->ctx, 0, sizeof(struct lttng_ust_context));
44d3bd01 DG	181
97ee3a89	182	/* Copy channel name */
44d3bd01	183	strncpy(luc->name, chan->name, sizeof(&luc->name));
97ee3a89 DG	184	luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
	185
	186	/* Set trace output path */
44d3bd01	187	ret = snprintf(luc->trace_path, PATH_MAX, "%s", path);
97ee3a89 DG	188	if (ret < 0) {
	189	perror("asprintf ust create channel");
	190	goto error;
	191	}
	192
	193	return luc;
	194
	195	error:
	196	return NULL;
	197	}
	198
	199	/*
	200	* Allocate and initialize a ust event. Set name and event type.
	201	*
	202	* Return pointer to structure or NULL.
	203	*/
	204	struct ltt_ust_event trace_ust_create_event(struct lttng_event ev)
	205	{
	206	struct ltt_ust_event *lue;
97ee3a89 DG	207
97ee3a89 DG	208	lue = malloc(sizeof(struct ltt_ust_event));
44d3bd01 DG	209	if (lue == NULL) {
44d3bd01 DG	210	PERROR("ust event malloc");
97ee3a89 DG	211	goto error;
	212	}
	213
	214	switch (ev->type) {
	215	case LTTNG_EVENT_PROBE:
44d3bd01	216	lue->attr.instrumentation = LTTNG_UST_PROBE;
97ee3a89 DG	217	break;
97ee3a89 DG	218	case LTTNG_EVENT_FUNCTION:
44d3bd01	219	lue->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89 DG	220	break;
97ee3a89 DG	221	case LTTNG_EVENT_FUNCTION_ENTRY:
44d3bd01	222	lue->attr.instrumentation = LTTNG_UST_FUNCTION;
97ee3a89 DG	223	break;
97ee3a89 DG	224	case LTTNG_EVENT_TRACEPOINT:
44d3bd01	225	lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
97ee3a89 DG	226	break;
	227	default:
	228	ERR("Unknown ust instrumentation type (%d)", ev->type);
	229	goto error;
	230	}
	231
	232	/* Copy event name */
44d3bd01 DG	233	strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
44d3bd01 DG	234	lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
97ee3a89 DG	235
	236	/* Setting up a ust event */
	237	lue->handle = -1;
97ee3a89	238	lue->enabled = 1;
44d3bd01	239	memset(&lue->ctx, 0, sizeof(struct lttng_ust_context));
97ee3a89 DG	240
	241	return lue;
	242
	243	error:
	244	return NULL;
	245	}
	246
	247	/*
	248	* Allocate and initialize a ust metadata.
	249	*
	250	* Return pointer to structure or NULL.
	251	*/
	252	struct ltt_ust_metadata trace_ust_create_metadata(char path)
	253	{
	254	int ret;
	255	struct ltt_ust_metadata *lum;
97ee3a89 DG	256
97ee3a89 DG	257	lum = malloc(sizeof(struct ltt_ust_metadata));
44d3bd01	258	if (lum == NULL) {
97ee3a89 DG	259	perror("ust metadata malloc");
	260	goto error;
	261	}
	262
	263	/* Set default attributes */
44d3bd01 DG	264	lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
	265	lum->attr.subbuf_size = DEFAULT_METADATA_SUBBUF_SIZE;
	266	lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
	267	lum->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
	268	lum->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
	269	lum->attr.output = DEFAULT_UST_CHANNEL_OUTPUT;
	270
97ee3a89 DG	271	lum->handle = -1;
	272	/* Set metadata trace path */
	273	ret = asprintf(&lum->trace_path, "%s/metadata", path);
	274	if (ret < 0) {
	275	perror("asprintf ust metadata");
	276	goto error;
	277	}
	278
	279	return lum;
	280
	281	error:
	282	return NULL;
	283	}
	284
	285	/*
	286	* Cleanup ust event structure.
	287	*/
	288	void trace_ust_destroy_event(struct ltt_ust_event *event)
	289	{
44d3bd01	290	DBG("[trace] Destroy ust event %s", event->attr.name);
97ee3a89 DG	291
	292	/* Remove from event list */
	293	cds_list_del(&event->list);
	294	free(event);
	295	}
	296
	297	/*
	298	* Cleanup ust channel structure.
	299	*/
	300	void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
	301	{
	302	struct ltt_ust_event event, etmp;
	303
	304	DBG("[trace] Destroy ust channel %d", channel->handle);
	305
97ee3a89 DG	306	/* For each event in the channel list */
	307	cds_list_for_each_entry_safe(event, etmp, &channel->events.head, list) {
	308	trace_ust_destroy_event(event);
	309	}
	310
	311	/* Remove from channel list */
	312	cds_list_del(&channel->list);
	313	free(channel);
	314	}
	315
	316	/*
	317	* Cleanup ust metadata structure.
	318	*/
	319	void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
	320	{
	321	DBG("[trace] Destroy ust metadata %d", metadata->handle);
	322
	323	/* Free attributes */
97ee3a89 DG	324	free(metadata->trace_path);
	325
	326	free(metadata);
	327	}
	328
	329	/*
	330	* Cleanup ust session structure
	331	*/
	332	void trace_ust_destroy_session(struct ltt_ust_session *session)
	333	{
	334	struct ltt_ust_channel channel, ctmp;
	335
	336	DBG("[trace] Destroy ust session %d", session->handle);
	337
	338	/* Extra safety */
	339	if (session == NULL) {
	340	return;
	341	}
	342
	343	if (session->metadata != NULL) {
	344	trace_ust_destroy_metadata(session->metadata);
	345	}
	346
	347	cds_list_for_each_entry_safe(channel, ctmp, &session->channels.head, list) {
	348	trace_ust_destroy_channel(channel);
	349	}
	350
44d3bd01 DG	351	if (session->path) {
	352	free(session->path);
	353	}
	354
97ee3a89 DG	355	free(session);
97ee3a89 DG	356	}