[lttng-tools.git] / src / lib / lttng-ctl / lttng-ctl-health.cpp

/*
 * lttng-ctl-health.c
 *
 * Linux Trace Toolkit Health Control Library
 *
 * Copyright (C) 2011 EfficiOS Inc.
 * Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * SPDX-License-Identifier: LGPL-2.1-only
 *
 */

#define _LGPL_SOURCE
#include <unistd.h>
#include <sys/types.h>
#include <stdint.h>
#include <limits.h>
#include <string.h>
#include <lttng/health-internal.hpp>

#include <bin/lttng-sessiond/health-sessiond.hpp>
#include <bin/lttng-consumerd/health-consumerd.hpp>
#include <bin/lttng-relayd/health-relayd.hpp>
#include <common/defaults.hpp>
#include <common/utils.hpp>
#include <common/compat/errno.hpp>

#include "lttng-ctl-helper.hpp"

enum health_component {
	HEALTH_COMPONENT_SESSIOND,
	HEALTH_COMPONENT_CONSUMERD,
	HEALTH_COMPONENT_RELAYD,

	NR_HEALTH_COMPONENT,
};

struct lttng_health_thread {
	struct lttng_health *p;
	int state;
};

struct lttng_health {
	enum health_component component;
	uint64_t state;
	unsigned int nr_threads;
	char health_sock_path[PATH_MAX];
	/* For consumer health only */
	enum lttng_health_consumerd consumerd_type;
	struct lttng_health_thread thread[];
};

static
const char *get_sessiond_thread_name(health_type_sessiond type) {
	switch (type)
	{
	case HEALTH_SESSIOND_TYPE_CMD:
		return "Session daemon command";
	case HEALTH_SESSIOND_TYPE_APP_MANAGE:
		return "Session daemon application manager";
	case HEALTH_SESSIOND_TYPE_APP_REG:
		return "Session daemon application registration";
	case HEALTH_SESSIOND_TYPE_KERNEL:
		return "Session daemon kernel";
	case HEALTH_SESSIOND_TYPE_CONSUMER:
		return "Session daemon consumer manager";
	case HEALTH_SESSIOND_TYPE_APP_MANAGE_NOTIFY:
		return "Session daemon application notification manager";
	case HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH:
		return "Session daemon application registration dispatcher";
	case HEALTH_SESSIOND_TYPE_NOTIFICATION:
		return "Session daemon notification";
	case HEALTH_SESSIOND_TYPE_ROTATION:
		return "Session daemon rotation manager";
	case HEALTH_SESSIOND_TYPE_TIMER:
		return "Session daemon timer manager";
	case HEALTH_SESSIOND_TYPE_ACTION_EXECUTOR:
		return "Session daemon trigger action executor";
	case NR_HEALTH_SESSIOND_TYPES:
		abort();
	}

	abort();
};

static
const char *get_consumerd_thread_name(health_type_consumerd type) {
	switch (type) {
	case HEALTH_CONSUMERD_TYPE_CHANNEL:
		return "Consumer daemon channel";
	case HEALTH_CONSUMERD_TYPE_METADATA:
		return "Consumer daemon metadata";
	case HEALTH_CONSUMERD_TYPE_DATA:
		return "Consumer daemon data";
	case HEALTH_CONSUMERD_TYPE_SESSIOND:
		return "Consumer daemon session daemon command manager";
	case HEALTH_CONSUMERD_TYPE_METADATA_TIMER:
		return "Consumer daemon metadata timer";
	case NR_HEALTH_CONSUMERD_TYPES:
		abort();
	}

	abort();
};

static
const char *get_relayd_thread_name(health_type_relayd type)
{
	switch (type) {
	case HEALTH_RELAYD_TYPE_DISPATCHER:
		return "Relay daemon dispatcher";
	case HEALTH_RELAYD_TYPE_WORKER:
		return "Relay daemon worker";
	case HEALTH_RELAYD_TYPE_LISTENER:
		return "Relay daemon listener";
	case HEALTH_RELAYD_TYPE_LIVE_DISPATCHER:
		return "Relay daemon live dispatcher";
	case HEALTH_RELAYD_TYPE_LIVE_WORKER:
		return "Relay daemon live worker";
	case HEALTH_RELAYD_TYPE_LIVE_LISTENER:
		return "Relay daemon live listener";
	case NR_HEALTH_RELAYD_TYPES:
		abort();
	}

	abort();
}

static
const char *get_thread_name(int comp, int nr)
{
	switch (comp) {
	case HEALTH_COMPONENT_SESSIOND:
		return get_sessiond_thread_name((health_type_sessiond) nr);
	case HEALTH_COMPONENT_CONSUMERD:
		return get_consumerd_thread_name((health_type_consumerd) nr);
	case HEALTH_COMPONENT_RELAYD:
		return get_relayd_thread_name((health_type_relayd) nr);
	case NR_HEALTH_COMPONENT:
		abort();
	}

	abort();
}

/*
 * Set health socket path.
 *
 * Returns 0 on success or a negative errno.
 */
static
int set_health_socket_path(struct lttng_health *lh,
		int tracing_group)
{
	uid_t uid;
	const char *home;
	int ret;
	/* Global and home format strings */
	const char *global_str, *home_str;

	switch (lh->component) {
	case HEALTH_COMPONENT_SESSIOND:
		global_str = DEFAULT_GLOBAL_HEALTH_UNIX_SOCK;
		home_str = DEFAULT_HOME_HEALTH_UNIX_SOCK;
		break;
	case HEALTH_COMPONENT_CONSUMERD:
		switch (lh->consumerd_type) {
		case LTTNG_HEALTH_CONSUMERD_UST_32:
			global_str = DEFAULT_GLOBAL_USTCONSUMER32_HEALTH_UNIX_SOCK;
			home_str = DEFAULT_HOME_USTCONSUMER32_HEALTH_UNIX_SOCK;
			break;
		case LTTNG_HEALTH_CONSUMERD_UST_64:
			global_str = DEFAULT_GLOBAL_USTCONSUMER64_HEALTH_UNIX_SOCK;
			home_str = DEFAULT_HOME_USTCONSUMER64_HEALTH_UNIX_SOCK;
			break;
		case LTTNG_HEALTH_CONSUMERD_KERNEL:
			global_str = DEFAULT_GLOBAL_KCONSUMER_HEALTH_UNIX_SOCK;
			home_str = DEFAULT_HOME_KCONSUMER_HEALTH_UNIX_SOCK;
			break;
		default:
			return -EINVAL;
		}
		break;
	case HEALTH_COMPONENT_RELAYD:
		if (lh->health_sock_path[0] == '\0') {
			return -EINVAL;
		} else {
			return 0;
		}
		break;	/* Unreached */
	default:
		return -EINVAL;
	}

	uid = getuid();

	if (uid == 0 || tracing_group) {
		ret = lttng_strncpy(lh->health_sock_path,
				global_str,
				sizeof(lh->health_sock_path));
		return ret == 0 ? 0 : -EINVAL;
	}

	/*
	 * With GNU C <  2.1, snprintf returns -1 if the target buffer
	 * is too small; With GNU C >= 2.1, snprintf returns the
	 * required size (excluding closing null).
	 */
	home = utils_get_home_dir();
	if (home == NULL) {
		/* Fallback in /tmp */
		home = "/tmp";
	}

	DIAGNOSTIC_PUSH
	DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
	ret = snprintf(lh->health_sock_path, sizeof(lh->health_sock_path),
			home_str, home);
	DIAGNOSTIC_POP
	if ((ret < 0) || (ret >= sizeof(lh->health_sock_path))) {
		return -ENOMEM;
	}

	return 0;
}

static
struct lttng_health *lttng_health_create(enum health_component hc,
		unsigned int nr_threads)
{
	struct lttng_health *lh;
	int i;

	lh = (lttng_health *) zmalloc(sizeof(*lh) + sizeof(lh->thread[0]) * nr_threads);
	if (!lh) {
		return NULL;
	}

	lh->component = hc;
	lh->state = UINT64_MAX;		/* All bits in error initially */
	lh->nr_threads = nr_threads;
	for (i = 0; i < nr_threads; i++) {
		lh->thread[i].p = lh;
	}
	return lh;
}

struct lttng_health *lttng_health_create_sessiond(void)
{
	struct lttng_health *lh;

	lh = lttng_health_create(HEALTH_COMPONENT_SESSIOND,
			NR_HEALTH_SESSIOND_TYPES);
	if (!lh) {
		return NULL;
	}
	return lh;
}

struct lttng_health *
	lttng_health_create_consumerd(enum lttng_health_consumerd consumerd)
{
	struct lttng_health *lh;

	lh = lttng_health_create(HEALTH_COMPONENT_CONSUMERD,
			NR_HEALTH_CONSUMERD_TYPES);
	if (!lh) {
		return NULL;
	}
	lh->consumerd_type = consumerd;
	return lh;
}

struct lttng_health *lttng_health_create_relayd(const char *path)
{
	int ret;
	struct lttng_health *lh = NULL;

	if (!path) {
		goto error;
	}

	lh = lttng_health_create(HEALTH_COMPONENT_RELAYD,
			NR_HEALTH_RELAYD_TYPES);
	if (!lh) {
		goto error;
	}

	ret = lttng_strncpy(lh->health_sock_path, path,
			sizeof(lh->health_sock_path));
	if (ret) {
		goto error;
	}

	return lh;

error:
	free(lh);
	return NULL;
}

void lttng_health_destroy(struct lttng_health *lh)
{
	free(lh);
}

int lttng_health_query(struct lttng_health *health)
{
	int sock, ret, i, tracing_group;
	struct health_comm_msg msg;
	struct health_comm_reply reply;

	if (!health) {
		return -EINVAL;
	}

	tracing_group = lttng_check_tracing_group();
retry:
	ret = set_health_socket_path(health, tracing_group);
	if (ret) {
		goto error;
	}
	/* Connect to component */
	sock = lttcomm_connect_unix_sock(health->health_sock_path);
	if (sock < 0) {
		if (tracing_group) {
			/* For tracing group, fallback to per-user */
			tracing_group = 0;
			goto retry;
		}
		ret = -1;
		goto error;
	}

	memset(&msg, 0, sizeof(msg));
	msg.cmd = HEALTH_CMD_CHECK;

	ret = lttcomm_send_unix_sock(sock, (void *)&msg, sizeof(msg));
	if (ret < 0) {
		ret = -1;
		goto close_error;
	}

	ret = lttcomm_recv_unix_sock(sock, (void *)&reply, sizeof(reply));
	if (ret < 0) {
		ret = -1;
		goto close_error;
	}

	health->state = reply.ret_code;
	for (i = 0; i < health->nr_threads; i++) {
		if (health->state & (1ULL << i)) {
			health->thread[i].state = -1;
		} else {
			health->thread[i].state = 0;
		}
	}

close_error:
	{
		int closeret;

		closeret = close(sock);
		LTTNG_ASSERT(!closeret);
	}

error:
	if (ret >= 0)
		ret = 0;
	return ret;
}

int lttng_health_state(const struct lttng_health *health)
{
	if (!health) {
		return -EINVAL;
	}

	if (health->state == 0) {
		return 0;
	} else {
		return -1;
	}
}

int lttng_health_get_nr_threads(const struct lttng_health *health)
{
	if (!health) {
		return -EINVAL;
	}
	return health->nr_threads;
}

const struct lttng_health_thread *
	lttng_health_get_thread(const struct lttng_health *health,
		unsigned int nth_thread)
{
	if (!health || nth_thread >= health->nr_threads) {
		return NULL;
	}
	return &health->thread[nth_thread];
}

int lttng_health_thread_state(const struct lttng_health_thread *thread)
{
	if (!thread) {
		return -EINVAL;
	}
	return thread->state;
}

const char *lttng_health_thread_name(const struct lttng_health_thread *thread)
{
	unsigned int nr;

	if (!thread) {
		return NULL;
	}
	nr = thread - &thread->p->thread[0];
	return get_thread_name (thread->p->component, nr);
}
Commit	Line	Data
6c71277b MD	1	/*
	2	* lttng-ctl-health.c
	3	*
	4	* Linux Trace Toolkit Health Control Library
	5	*
21cf9b6b	6	* Copyright (C) 2011 EfficiOS Inc.
6c71277b MD	7	* Copyright (C) 2013 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
6c71277b MD	8	*
ab5be9fa	9	* SPDX-License-Identifier: LGPL-2.1-only
6c71277b	10	*
6c71277b MD	11	*/
6c71277b MD	12
6c1c0768	13	#define _LGPL_SOURCE
6c71277b MD	14	#include <unistd.h>
	15	#include <sys/types.h>
	16	#include <stdint.h>
	17	#include <limits.h>
73d8fe3e	18	#include <string.h>
c9e313bc	19	#include <lttng/health-internal.hpp>
6c71277b	20
c9e313bc SM	21	#include <bin/lttng-sessiond/health-sessiond.hpp>
	22	#include <bin/lttng-consumerd/health-consumerd.hpp>
	23	#include <bin/lttng-relayd/health-relayd.hpp>
	24	#include <common/defaults.hpp>
	25	#include <common/utils.hpp>
	26	#include <common/compat/errno.hpp>
6c71277b	27
c9e313bc	28	#include "lttng-ctl-helper.hpp"
6c71277b MD	29
	30	enum health_component {
	31	HEALTH_COMPONENT_SESSIOND,
	32	HEALTH_COMPONENT_CONSUMERD,
	33	HEALTH_COMPONENT_RELAYD,
	34
	35	NR_HEALTH_COMPONENT,
	36	};
	37
	38	struct lttng_health_thread {
	39	struct lttng_health *p;
	40	int state;
	41	};
	42
	43	struct lttng_health {
	44	enum health_component component;
	45	uint64_t state;
	46	unsigned int nr_threads;
	47	char health_sock_path[PATH_MAX];
	48	/* For consumer health only */
	49	enum lttng_health_consumerd consumerd_type;
	50	struct lttng_health_thread thread[];
	51	};
	52
	53	static
4bd69c5f SM	54	const char *get_sessiond_thread_name(health_type_sessiond type) {
	55	switch (type)
	56	{
	57	case HEALTH_SESSIOND_TYPE_CMD:
	58	return "Session daemon command";
	59	case HEALTH_SESSIOND_TYPE_APP_MANAGE:
	60	return "Session daemon application manager";
	61	case HEALTH_SESSIOND_TYPE_APP_REG:
	62	return "Session daemon application registration";
	63	case HEALTH_SESSIOND_TYPE_KERNEL:
	64	return "Session daemon kernel";
	65	case HEALTH_SESSIOND_TYPE_CONSUMER:
	66	return "Session daemon consumer manager";
4bd69c5f SM	67	case HEALTH_SESSIOND_TYPE_APP_MANAGE_NOTIFY:
	68	return "Session daemon application notification manager";
	69	case HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH:
	70	return "Session daemon application registration dispatcher";
	71	case HEALTH_SESSIOND_TYPE_NOTIFICATION:
	72	return "Session daemon notification";
	73	case HEALTH_SESSIOND_TYPE_ROTATION:
	74	return "Session daemon rotation manager";
	75	case HEALTH_SESSIOND_TYPE_TIMER:
	76	return "Session daemon timer manager";
	77	case HEALTH_SESSIOND_TYPE_ACTION_EXECUTOR:
	78	return "Session daemon trigger action executor";
	79	case NR_HEALTH_SESSIOND_TYPES:
	80	abort();
	81	}
	82
	83	abort();
6c71277b MD	84	};
	85
	86	static
4bd69c5f SM	87	const char *get_consumerd_thread_name(health_type_consumerd type) {
	88	switch (type) {
	89	case HEALTH_CONSUMERD_TYPE_CHANNEL:
	90	return "Consumer daemon channel";
	91	case HEALTH_CONSUMERD_TYPE_METADATA:
	92	return "Consumer daemon metadata";
	93	case HEALTH_CONSUMERD_TYPE_DATA:
	94	return "Consumer daemon data";
	95	case HEALTH_CONSUMERD_TYPE_SESSIOND:
	96	return "Consumer daemon session daemon command manager";
	97	case HEALTH_CONSUMERD_TYPE_METADATA_TIMER:
	98	return "Consumer daemon metadata timer";
	99	case NR_HEALTH_CONSUMERD_TYPES:
	100	abort();
	101	}
	102
	103	abort();
6c71277b MD	104	};
	105
	106	static
4bd69c5f SM	107	const char *get_relayd_thread_name(health_type_relayd type)
	108	{
	109	switch (type) {
	110	case HEALTH_RELAYD_TYPE_DISPATCHER:
	111	return "Relay daemon dispatcher";
	112	case HEALTH_RELAYD_TYPE_WORKER:
	113	return "Relay daemon worker";
	114	case HEALTH_RELAYD_TYPE_LISTENER:
	115	return "Relay daemon listener";
	116	case HEALTH_RELAYD_TYPE_LIVE_DISPATCHER:
	117	return "Relay daemon live dispatcher";
	118	case HEALTH_RELAYD_TYPE_LIVE_WORKER:
	119	return "Relay daemon live worker";
	120	case HEALTH_RELAYD_TYPE_LIVE_LISTENER:
	121	return "Relay daemon live listener";
	122	case NR_HEALTH_RELAYD_TYPES:
	123	abort();
	124	}
	125
	126	abort();
	127	}
6c71277b MD	128
6c71277b MD	129	static
4bd69c5f SM	130	const char *get_thread_name(int comp, int nr)
	131	{
	132	switch (comp) {
	133	case HEALTH_COMPONENT_SESSIOND:
	134	return get_sessiond_thread_name((health_type_sessiond) nr);
	135	case HEALTH_COMPONENT_CONSUMERD:
	136	return get_consumerd_thread_name((health_type_consumerd) nr);
	137	case HEALTH_COMPONENT_RELAYD:
	138	return get_relayd_thread_name((health_type_relayd) nr);
	139	case NR_HEALTH_COMPONENT:
	140	abort();
	141	}
	142
	143	abort();
	144	}
6c71277b MD	145
	146	/*
	147	* Set health socket path.
	148	*
e1b624d0	149	* Returns 0 on success or a negative errno.
6c71277b MD	150	*/
	151	static
	152	int set_health_socket_path(struct lttng_health *lh,
	153	int tracing_group)
	154	{
	155	uid_t uid;
	156	const char *home;
	157	int ret;
	158	/* Global and home format strings */
	159	const char global_str, home_str;
	160
	161	switch (lh->component) {
	162	case HEALTH_COMPONENT_SESSIOND:
	163	global_str = DEFAULT_GLOBAL_HEALTH_UNIX_SOCK;
	164	home_str = DEFAULT_HOME_HEALTH_UNIX_SOCK;
	165	break;
	166	case HEALTH_COMPONENT_CONSUMERD:
	167	switch (lh->consumerd_type) {
	168	case LTTNG_HEALTH_CONSUMERD_UST_32:
	169	global_str = DEFAULT_GLOBAL_USTCONSUMER32_HEALTH_UNIX_SOCK;
	170	home_str = DEFAULT_HOME_USTCONSUMER32_HEALTH_UNIX_SOCK;
	171	break;
	172	case LTTNG_HEALTH_CONSUMERD_UST_64:
	173	global_str = DEFAULT_GLOBAL_USTCONSUMER64_HEALTH_UNIX_SOCK;
	174	home_str = DEFAULT_HOME_USTCONSUMER64_HEALTH_UNIX_SOCK;
	175	break;
	176	case LTTNG_HEALTH_CONSUMERD_KERNEL:
	177	global_str = DEFAULT_GLOBAL_KCONSUMER_HEALTH_UNIX_SOCK;
	178	home_str = DEFAULT_HOME_KCONSUMER_HEALTH_UNIX_SOCK;
	179	break;
	180	default:
	181	return -EINVAL;
	182	}
	183	break;
	184	case HEALTH_COMPONENT_RELAYD:
	185	if (lh->health_sock_path[0] == '\0') {
	186	return -EINVAL;
	187	} else {
	188	return 0;
	189	}
	190	break; /* Unreached */
	191	default:
	192	return -EINVAL;
	193	}
	194
	195	uid = getuid();
	196
	197	if (uid == 0 \|\| tracing_group) {
e1b624d0	198	ret = lttng_strncpy(lh->health_sock_path,
6c71277b MD	199	global_str,
6c71277b MD	200	sizeof(lh->health_sock_path));
e1b624d0	201	return ret == 0 ? 0 : -EINVAL;
6c71277b MD	202	}
	203
	204	/*
	205	* With GNU C < 2.1, snprintf returns -1 if the target buffer
	206	* is too small; With GNU C >= 2.1, snprintf returns the
	207	* required size (excluding closing null).
	208	*/
	209	home = utils_get_home_dir();
	210	if (home == NULL) {
	211	/* Fallback in /tmp */
	212	home = "/tmp";
	213	}
	214
411b3154 SM	215	DIAGNOSTIC_PUSH
411b3154 SM	216	DIAGNOSTIC_IGNORE_FORMAT_NONLITERAL
6c71277b MD	217	ret = snprintf(lh->health_sock_path, sizeof(lh->health_sock_path),
6c71277b MD	218	home_str, home);
411b3154	219	DIAGNOSTIC_POP
6c71277b MD	220	if ((ret < 0) \|\| (ret >= sizeof(lh->health_sock_path))) {
	221	return -ENOMEM;
	222	}
	223
	224	return 0;
	225	}
	226
	227	static
	228	struct lttng_health *lttng_health_create(enum health_component hc,
	229	unsigned int nr_threads)
	230	{
	231	struct lttng_health *lh;
	232	int i;
	233
4bd69c5f	234	lh = (lttng_health ) zmalloc(sizeof(lh) + sizeof(lh->thread[0]) * nr_threads);
6c71277b MD	235	if (!lh) {
	236	return NULL;
	237	}
	238
	239	lh->component = hc;
	240	lh->state = UINT64_MAX; /* All bits in error initially */
	241	lh->nr_threads = nr_threads;
	242	for (i = 0; i < nr_threads; i++) {
	243	lh->thread[i].p = lh;
	244	}
	245	return lh;
	246	}
	247
	248	struct lttng_health *lttng_health_create_sessiond(void)
	249	{
	250	struct lttng_health *lh;
	251
	252	lh = lttng_health_create(HEALTH_COMPONENT_SESSIOND,
	253	NR_HEALTH_SESSIOND_TYPES);
	254	if (!lh) {
	255	return NULL;
	256	}
	257	return lh;
	258	}
	259
	260	struct lttng_health *
	261	lttng_health_create_consumerd(enum lttng_health_consumerd consumerd)
	262	{
	263	struct lttng_health *lh;
	264
	265	lh = lttng_health_create(HEALTH_COMPONENT_CONSUMERD,
	266	NR_HEALTH_CONSUMERD_TYPES);
	267	if (!lh) {
	268	return NULL;
	269	}
	270	lh->consumerd_type = consumerd;
	271	return lh;
	272	}
	273
	274	struct lttng_health lttng_health_create_relayd(const char path)
	275	{
e1b624d0 JG	276	int ret;
e1b624d0 JG	277	struct lttng_health *lh = NULL;
6c71277b MD	278
6c71277b MD	279	if (!path) {
e1b624d0	280	goto error;
6c71277b MD	281	}
	282
	283	lh = lttng_health_create(HEALTH_COMPONENT_RELAYD,
	284	NR_HEALTH_RELAYD_TYPES);
	285	if (!lh) {
e1b624d0	286	goto error;
6c71277b	287	}
e1b624d0	288
336a72eb JG	289	ret = lttng_strncpy(lh->health_sock_path, path,
336a72eb JG	290	sizeof(lh->health_sock_path));
e1b624d0 JG	291	if (ret) {
	292	goto error;
	293	}
	294
6c71277b	295	return lh;
e1b624d0 JG	296
	297	error:
	298	free(lh);
	299	return NULL;
6c71277b MD	300	}
	301
	302	void lttng_health_destroy(struct lttng_health *lh)
	303	{
	304	free(lh);
	305	}
	306
	307	int lttng_health_query(struct lttng_health *health)
	308	{
	309	int sock, ret, i, tracing_group;
	310	struct health_comm_msg msg;
	311	struct health_comm_reply reply;
	312
	313	if (!health) {
	314	return -EINVAL;
	315	}
	316
	317	tracing_group = lttng_check_tracing_group();
	318	retry:
	319	ret = set_health_socket_path(health, tracing_group);
	320	if (ret) {
	321	goto error;
	322	}
71d01237	323	/* Connect to component */
6c71277b MD	324	sock = lttcomm_connect_unix_sock(health->health_sock_path);
	325	if (sock < 0) {
	326	if (tracing_group) {
	327	/* For tracing group, fallback to per-user */
	328	tracing_group = 0;
	329	goto retry;
	330	}
	331	ret = -1;
	332	goto error;
	333	}
	334
53efb85a	335	memset(&msg, 0, sizeof(msg));
6c71277b MD	336	msg.cmd = HEALTH_CMD_CHECK;
	337
	338	ret = lttcomm_send_unix_sock(sock, (void *)&msg, sizeof(msg));
	339	if (ret < 0) {
	340	ret = -1;
	341	goto close_error;
	342	}
	343
	344	ret = lttcomm_recv_unix_sock(sock, (void *)&reply, sizeof(reply));
	345	if (ret < 0) {
	346	ret = -1;
	347	goto close_error;
	348	}
	349
	350	health->state = reply.ret_code;
	351	for (i = 0; i < health->nr_threads; i++) {
	352	if (health->state & (1ULL << i)) {
	353	health->thread[i].state = -1;
	354	} else {
	355	health->thread[i].state = 0;
	356	}
	357	}
	358
	359	close_error:
	360	{
	361	int closeret;
	362
	363	closeret = close(sock);
a0377dfe	364	LTTNG_ASSERT(!closeret);
6c71277b MD	365	}
	366
	367	error:
	368	if (ret >= 0)
	369	ret = 0;
	370	return ret;
	371	}
	372
	373	int lttng_health_state(const struct lttng_health *health)
	374	{
	375	if (!health) {
	376	return -EINVAL;
	377	}
	378
	379	if (health->state == 0) {
	380	return 0;
	381	} else {
	382	return -1;
	383	}
	384	}
	385
	386	int lttng_health_get_nr_threads(const struct lttng_health *health)
	387	{
	388	if (!health) {
	389	return -EINVAL;
	390	}
	391	return health->nr_threads;
	392	}
	393
	394	const struct lttng_health_thread *
	395	lttng_health_get_thread(const struct lttng_health *health,
	396	unsigned int nth_thread)
	397	{
	398	if (!health \|\| nth_thread >= health->nr_threads) {
	399	return NULL;
	400	}
	401	return &health->thread[nth_thread];
	402	}
	403
	404	int lttng_health_thread_state(const struct lttng_health_thread *thread)
	405	{
	406	if (!thread) {
	407	return -EINVAL;
	408	}
	409	return thread->state;
	410	}
	411
	412	const char lttng_health_thread_name(const struct lttng_health_thread thread)
	413	{
	414	unsigned int nr;
	415
	416	if (!thread) {
	417	return NULL;
	418	}
	419	nr = thread - &thread->p->thread[0];
4bd69c5f	420	return get_thread_name (thread->p->component, nr);
6c71277b	421	}