[lttng-tools.git] / src / bin / lttng-relayd / health-relayd.c

/*
 * Copyright (C) 2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * 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.
 */

#define _LGPL_SOURCE
#include <fcntl.h>
#include <getopt.h>
#include <grp.h>
#include <limits.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ipc.h>
#include <sys/resource.h>
#include <sys/shm.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <urcu/list.h>
#include <poll.h>
#include <unistd.h>
#include <sys/mman.h>
#include <assert.h>
#include <urcu/compiler.h>
#include <inttypes.h>

#include <common/defaults.h>
#include <common/common.h>
#include <common/consumer/consumer.h>
#include <common/consumer/consumer-timer.h>
#include <common/compat/poll.h>
#include <common/sessiond-comm/sessiond-comm.h>
#include <common/utils.h>
#include <common/compat/getenv.h>

#include "lttng-relayd.h"
#include "health-relayd.h"

/* Global health check unix path */
static
char health_unix_sock_path[PATH_MAX];

int health_quit_pipe[2];

/*
 * Check if the thread quit pipe was triggered.
 *
 * Return 1 if it was triggered else 0;
 */
static
int check_health_quit_pipe(int fd, uint32_t events)
{
	if (fd == health_quit_pipe[0] && (events & LPOLLIN)) {
		return 1;
	}

	return 0;
}

/*
 * Send data on a unix socket using the liblttsessiondcomm API.
 *
 * Return lttcomm error code.
 */
static int send_unix_sock(int sock, void *buf, size_t len)
{
	/* Check valid length */
	if (len == 0) {
		return -1;
	}

	return lttcomm_send_unix_sock(sock, buf, len);
}

static int create_lttng_rundir_with_perm(const char *rundir)
{
	int ret;

	DBG3("Creating LTTng run directory: %s", rundir);

	ret = mkdir(rundir, S_IRWXU);
	if (ret < 0) {
		if (errno != EEXIST) {
			ERR("Unable to create %s", rundir);
			goto error;
		} else {
			ret = 0;
		}
	} else if (ret == 0) {
		int is_root = !getuid();

		if (is_root) {
			gid_t gid;

			ret = utils_get_group_id(tracing_group_name, true, &gid);
			if (ret) {
				/* Default to root group. */
				gid = 0;
			}

			ret = chown(rundir, 0, gid);
			if (ret < 0) {
				ERR("Unable to set group on %s", rundir);
				PERROR("chown");
				ret = -1;
				goto error;
			}

			ret = chmod(rundir,
					S_IRUSR | S_IWUSR | S_IXUSR | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
			if (ret < 0) {
				ERR("Unable to set permissions on %s", health_unix_sock_path);
				PERROR("chmod");
				ret = -1;
				goto error;
			}
		}
	}

error:
	return ret;
}

static
int parse_health_env(void)
{
	const char *health_path;

	health_path = lttng_secure_getenv(LTTNG_RELAYD_HEALTH_ENV);
	if (health_path) {
		strncpy(health_unix_sock_path, health_path,
			PATH_MAX);
		health_unix_sock_path[PATH_MAX - 1] = '\0';
	}

	return 0;
}

static
int setup_health_path(void)
{
	int is_root, ret = 0;
	const char *home_path = NULL;
	char *rundir = NULL, *relayd_path = NULL;

	ret = parse_health_env();
	if (ret) {
		return ret;
	}

	is_root = !getuid();

	if (is_root) {
		rundir = strdup(DEFAULT_LTTNG_RUNDIR);
		if (!rundir) {
			ret = -ENOMEM;
			goto end;
		}
	} else {
		/*
		 * Create rundir from home path. This will create something like
		 * $HOME/.lttng
		 */
		home_path = utils_get_home_dir();

		if (home_path == NULL) {
			/* TODO: Add --socket PATH option */
			ERR("Can't get HOME directory for sockets creation.");
			ret = -EPERM;
			goto end;
		}

		ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
		if (ret < 0) {
			ret = -ENOMEM;
			goto end;
		}
	}

	ret = asprintf(&relayd_path, DEFAULT_RELAYD_PATH, rundir);
	if (ret < 0) {
		ret = -ENOMEM;
		goto end;
	}

	ret = create_lttng_rundir_with_perm(rundir);
	if (ret < 0) {
		goto end;
	}

	ret = create_lttng_rundir_with_perm(relayd_path);
	if (ret < 0) {
		goto end;
	}

	if (is_root) {
		if (strlen(health_unix_sock_path) != 0) {
			goto end;
		}
		snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
			DEFAULT_GLOBAL_RELAY_HEALTH_UNIX_SOCK,
			(int) getpid());
	} else {
		/* Set health check Unix path */
		if (strlen(health_unix_sock_path) != 0) {
			goto end;
		}

		snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
			DEFAULT_HOME_RELAY_HEALTH_UNIX_SOCK,
			home_path, (int) getpid());
	}

end:
	free(rundir);
	free(relayd_path);
	return ret;
}

/*
 * Thread managing health check socket.
 */
void *thread_manage_health(void *data)
{
	int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
	uint32_t revents, nb_fd;
	struct lttng_poll_event events;
	struct health_comm_msg msg;
	struct health_comm_reply reply;
	int is_root;

	DBG("[thread] Manage health check started");

	setup_health_path();

	rcu_register_thread();

	/* We might hit an error path before this is created. */
	lttng_poll_init(&events);

	/* Create unix socket */
	sock = lttcomm_create_unix_sock(health_unix_sock_path);
	if (sock < 0) {
		ERR("Unable to create health check Unix socket");
		err = -1;
		goto error;
	}

	is_root = !getuid();
	if (is_root) {
		/* lttng health client socket path permissions */
		gid_t gid;

		ret = utils_get_group_id(tracing_group_name, true, &gid);
		if (ret) {
			/* Default to root group. */
			gid = 0;
		}

		ret = chown(health_unix_sock_path, 0, gid);
		if (ret < 0) {
			ERR("Unable to set group on %s", health_unix_sock_path);
			PERROR("chown");
			err = -1;
			goto error;
		}

		ret = chmod(health_unix_sock_path,
				S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
		if (ret < 0) {
			ERR("Unable to set permissions on %s", health_unix_sock_path);
			PERROR("chmod");
			err = -1;
			goto error;
		}
	}

	/*
	 * Set the CLOEXEC flag. Return code is useless because either way, the
	 * show must go on.
	 */
	(void) utils_set_fd_cloexec(sock);

	ret = lttcomm_listen_unix_sock(sock);
	if (ret < 0) {
		goto error;
	}

	/* Size is set to 1 for the consumer_channel pipe */
	ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
	if (ret < 0) {
		ERR("Poll set creation failed");
		goto error;
	}

	ret = lttng_poll_add(&events, health_quit_pipe[0], LPOLLIN);
	if (ret < 0) {
		goto error;
	}

	/* Add the application registration socket */
	ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI);
	if (ret < 0) {
		goto error;
	}

	lttng_relay_notify_ready();

	while (1) {
		DBG("Health check ready");

		/* Inifinite blocking call, waiting for transmission */
restart:
		ret = lttng_poll_wait(&events, -1);
		if (ret < 0) {
			/*
			 * Restart interrupted system call.
			 */
			if (errno == EINTR) {
				goto restart;
			}
			goto error;
		}

		nb_fd = ret;

		for (i = 0; i < nb_fd; i++) {
			/* Fetch once the poll data */
			revents = LTTNG_POLL_GETEV(&events, i);
			pollfd = LTTNG_POLL_GETFD(&events, i);

			/* Thread quit pipe has been closed. Killing thread. */
			ret = check_health_quit_pipe(pollfd, revents);
			if (ret) {
				err = 0;
				goto exit;
			}

			/* Event on the registration socket */
			if (pollfd == sock) {
				if (revents & LPOLLIN) {
					continue;
				} else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) {
					ERR("Health socket poll error");
					goto error;
				} else {
					ERR("Unexpected poll events %u for sock %d", revents, pollfd);
					goto error;
				}
			}
		}

		new_sock = lttcomm_accept_unix_sock(sock);
		if (new_sock < 0) {
			goto error;
		}

		/*
		 * Set the CLOEXEC flag. Return code is useless because either way, the
		 * show must go on.
		 */
		(void) utils_set_fd_cloexec(new_sock);

		DBG("Receiving data from client for health...");
		ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
		if (ret <= 0) {
			DBG("Nothing recv() from client... continuing");
			ret = close(new_sock);
			if (ret) {
				PERROR("close");
			}
			new_sock = -1;
			continue;
		}

		rcu_thread_online();

		assert(msg.cmd == HEALTH_CMD_CHECK);

		memset(&reply, 0, sizeof(reply));
		for (i = 0; i < NR_HEALTH_RELAYD_TYPES; i++) {
			/*
			 * health_check_state return 0 if thread is in
			 * error.
			 */
			if (!health_check_state(health_relayd, i)) {
				reply.ret_code |= 1ULL << i;
			}
		}

		DBG2("Health check return value %" PRIx64, reply.ret_code);

		ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply));
		if (ret < 0) {
			ERR("Failed to send health data back to client");
		}

		/* End of transmission */
		ret = close(new_sock);
		if (ret) {
			PERROR("close");
		}
		new_sock = -1;
	}

error:
	lttng_relay_stop_threads();
exit:
	if (err) {
		ERR("Health error occurred in %s", __func__);
	}
	DBG("Health check thread dying");
	unlink(health_unix_sock_path);
	if (sock >= 0) {
		ret = close(sock);
		if (ret) {
			PERROR("close");
		}
	}

	/*
	 * We do NOT rmdir rundir nor the relayd path because there are
	 * other processes using them.
	 */

	lttng_poll_clean(&events);

	rcu_unregister_thread();
	return NULL;
}
Commit	Line	Data
65931c8b MD	1	/*
	2	* Copyright (C) 2013 - Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	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
6c1c0768	18	#define _LGPL_SOURCE
65931c8b MD	19	#include <fcntl.h>
	20	#include <getopt.h>
	21	#include <grp.h>
	22	#include <limits.h>
	23	#include <pthread.h>
	24	#include <signal.h>
	25	#include <stdio.h>
	26	#include <stdlib.h>
	27	#include <string.h>
	28	#include <sys/ipc.h>
	29	#include <sys/resource.h>
	30	#include <sys/shm.h>
	31	#include <sys/socket.h>
	32	#include <sys/stat.h>
	33	#include <sys/types.h>
	34	#include <urcu/list.h>
	35	#include <poll.h>
	36	#include <unistd.h>
	37	#include <sys/mman.h>
	38	#include <assert.h>
65931c8b	39	#include <urcu/compiler.h>
65931c8b MD	40	#include <inttypes.h>
	41
	42	#include <common/defaults.h>
	43	#include <common/common.h>
c8fea79c JR	44	#include <common/consumer/consumer.h>
c8fea79c JR	45	#include <common/consumer/consumer-timer.h>
65931c8b MD	46	#include <common/compat/poll.h>
	47	#include <common/sessiond-comm/sessiond-comm.h>
	48	#include <common/utils.h>
e8fa9fb0	49	#include <common/compat/getenv.h>
65931c8b MD	50
	51	#include "lttng-relayd.h"
	52	#include "health-relayd.h"
	53
	54	/* Global health check unix path */
094fe907 MD	55	static
094fe907 MD	56	char health_unix_sock_path[PATH_MAX];
65931c8b MD	57
	58	int health_quit_pipe[2];
	59
	60	/*
	61	* Check if the thread quit pipe was triggered.
	62	*
	63	* Return 1 if it was triggered else 0;
	64	*/
	65	static
	66	int check_health_quit_pipe(int fd, uint32_t events)
	67	{
	68	if (fd == health_quit_pipe[0] && (events & LPOLLIN)) {
	69	return 1;
	70	}
	71
	72	return 0;
	73	}
	74
	75	/*
	76	* Send data on a unix socket using the liblttsessiondcomm API.
	77	*
	78	* Return lttcomm error code.
	79	*/
	80	static int send_unix_sock(int sock, void *buf, size_t len)
	81	{
	82	/* Check valid length */
	83	if (len == 0) {
	84	return -1;
	85	}
	86
	87	return lttcomm_send_unix_sock(sock, buf, len);
	88	}
	89
	90	static int create_lttng_rundir_with_perm(const char *rundir)
	91	{
	92	int ret;
	93
	94	DBG3("Creating LTTng run directory: %s", rundir);
	95
	96	ret = mkdir(rundir, S_IRWXU);
	97	if (ret < 0) {
	98	if (errno != EEXIST) {
	99	ERR("Unable to create %s", rundir);
	100	goto error;
	101	} else {
	102	ret = 0;
	103	}
	104	} else if (ret == 0) {
	105	int is_root = !getuid();
	106
	107	if (is_root) {
28ab59d0 JR	108	gid_t gid;
	109
	110	ret = utils_get_group_id(tracing_group_name, true, &gid);
	111	if (ret) {
	112	/* Default to root group. */
	113	gid = 0;
	114	}
	115
	116	ret = chown(rundir, 0, gid);
65931c8b MD	117	if (ret < 0) {
	118	ERR("Unable to set group on %s", rundir);
	119	PERROR("chown");
	120	ret = -1;
	121	goto error;
	122	}
	123
	124	ret = chmod(rundir,
	125	S_IRUSR \| S_IWUSR \| S_IXUSR \| S_IRGRP \| S_IXGRP \| S_IROTH \| S_IXOTH);
	126	if (ret < 0) {
	127	ERR("Unable to set permissions on %s", health_unix_sock_path);
	128	PERROR("chmod");
	129	ret = -1;
	130	goto error;
	131	}
	132	}
	133	}
	134
	135	error:
	136	return ret;
	137	}
	138
094fe907 MD	139	static
	140	int parse_health_env(void)
	141	{
	142	const char *health_path;
	143
e8fa9fb0	144	health_path = lttng_secure_getenv(LTTNG_RELAYD_HEALTH_ENV);
094fe907 MD	145	if (health_path) {
	146	strncpy(health_unix_sock_path, health_path,
	147	PATH_MAX);
	148	health_unix_sock_path[PATH_MAX - 1] = '\0';
	149	}
	150
	151	return 0;
	152	}
	153
65931c8b MD	154	static
	155	int setup_health_path(void)
	156	{
	157	int is_root, ret = 0;
4f00620d JG	158	const char *home_path = NULL;
4f00620d JG	159	char rundir = NULL, relayd_path = NULL;
65931c8b	160
094fe907 MD	161	ret = parse_health_env();
	162	if (ret) {
	163	return ret;
	164	}
	165
65931c8b MD	166	is_root = !getuid();
	167
	168	if (is_root) {
c3844e39	169	rundir = strdup(DEFAULT_LTTNG_RUNDIR);
b6ab01aa MD	170	if (!rundir) {
	171	ret = -ENOMEM;
	172	goto end;
	173	}
65931c8b MD	174	} else {
	175	/*
	176	* Create rundir from home path. This will create something like
	177	* $HOME/.lttng
	178	*/
	179	home_path = utils_get_home_dir();
	180
	181	if (home_path == NULL) {
	182	/* TODO: Add --socket PATH option */
	183	ERR("Can't get HOME directory for sockets creation.");
	184	ret = -EPERM;
	185	goto end;
	186	}
	187
c3844e39	188	ret = asprintf(&rundir, DEFAULT_LTTNG_HOME_RUNDIR, home_path);
65931c8b MD	189	if (ret < 0) {
	190	ret = -ENOMEM;
	191	goto end;
	192	}
	193	}
	194
c3844e39	195	ret = asprintf(&relayd_path, DEFAULT_RELAYD_PATH, rundir);
65931c8b MD	196	if (ret < 0) {
	197	ret = -ENOMEM;
	198	goto end;
	199	}
	200
c3844e39	201	ret = create_lttng_rundir_with_perm(rundir);
65931c8b MD	202	if (ret < 0) {
	203	goto end;
	204	}
	205
	206	ret = create_lttng_rundir_with_perm(relayd_path);
	207	if (ret < 0) {
	208	goto end;
	209	}
	210
	211	if (is_root) {
	212	if (strlen(health_unix_sock_path) != 0) {
	213	goto end;
	214	}
	215	snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
	216	DEFAULT_GLOBAL_RELAY_HEALTH_UNIX_SOCK,
d1f721c5	217	(int) getpid());
65931c8b MD	218	} else {
	219	/* Set health check Unix path */
	220	if (strlen(health_unix_sock_path) != 0) {
	221	goto end;
	222	}
	223
	224	snprintf(health_unix_sock_path, sizeof(health_unix_sock_path),
	225	DEFAULT_HOME_RELAY_HEALTH_UNIX_SOCK,
d1f721c5	226	home_path, (int) getpid());
65931c8b MD	227	}
	228
	229	end:
c3844e39	230	free(rundir);
edd94901	231	free(relayd_path);
65931c8b MD	232	return ret;
	233	}
	234
	235	/*
	236	* Thread managing health check socket.
	237	*/
	238	void thread_manage_health(void data)
	239	{
	240	int sock = -1, new_sock = -1, ret, i, pollfd, err = -1;
	241	uint32_t revents, nb_fd;
	242	struct lttng_poll_event events;
	243	struct health_comm_msg msg;
	244	struct health_comm_reply reply;
	245	int is_root;
	246
	247	DBG("[thread] Manage health check started");
	248
	249	setup_health_path();
	250
	251	rcu_register_thread();
	252
	253	/* We might hit an error path before this is created. */
	254	lttng_poll_init(&events);
	255
	256	/* Create unix socket */
	257	sock = lttcomm_create_unix_sock(health_unix_sock_path);
	258	if (sock < 0) {
	259	ERR("Unable to create health check Unix socket");
7568ddbf	260	err = -1;
65931c8b MD	261	goto error;
	262	}
	263
	264	is_root = !getuid();
	265	if (is_root) {
	266	/* lttng health client socket path permissions */
28ab59d0 JR	267	gid_t gid;
	268
	269	ret = utils_get_group_id(tracing_group_name, true, &gid);
	270	if (ret) {
	271	/* Default to root group. */
	272	gid = 0;
	273	}
	274
	275	ret = chown(health_unix_sock_path, 0, gid);
65931c8b MD	276	if (ret < 0) {
	277	ERR("Unable to set group on %s", health_unix_sock_path);
	278	PERROR("chown");
7568ddbf	279	err = -1;
65931c8b MD	280	goto error;
	281	}
	282
	283	ret = chmod(health_unix_sock_path,
	284	S_IRUSR \| S_IWUSR \| S_IRGRP \| S_IWGRP);
	285	if (ret < 0) {
	286	ERR("Unable to set permissions on %s", health_unix_sock_path);
	287	PERROR("chmod");
7568ddbf	288	err = -1;
65931c8b MD	289	goto error;
	290	}
	291	}
	292
	293	/*
	294	* Set the CLOEXEC flag. Return code is useless because either way, the
	295	* show must go on.
	296	*/
	297	(void) utils_set_fd_cloexec(sock);
	298
	299	ret = lttcomm_listen_unix_sock(sock);
	300	if (ret < 0) {
	301	goto error;
	302	}
	303
	304	/* Size is set to 1 for the consumer_channel pipe */
	305	ret = lttng_poll_create(&events, 2, LTTNG_CLOEXEC);
	306	if (ret < 0) {
	307	ERR("Poll set creation failed");
	308	goto error;
	309	}
	310
	311	ret = lttng_poll_add(&events, health_quit_pipe[0], LPOLLIN);
	312	if (ret < 0) {
	313	goto error;
	314	}
	315
	316	/* Add the application registration socket */
	317	ret = lttng_poll_add(&events, sock, LPOLLIN \| LPOLLPRI);
	318	if (ret < 0) {
	319	goto error;
	320	}
	321
3fd27398 MD	322	lttng_relay_notify_ready();
3fd27398 MD	323
65931c8b MD	324	while (1) {
	325	DBG("Health check ready");
	326
	327	/* Inifinite blocking call, waiting for transmission */
	328	restart:
	329	ret = lttng_poll_wait(&events, -1);
	330	if (ret < 0) {
	331	/*
	332	* Restart interrupted system call.
	333	*/
	334	if (errno == EINTR) {
	335	goto restart;
	336	}
	337	goto error;
	338	}
	339
	340	nb_fd = ret;
	341
	342	for (i = 0; i < nb_fd; i++) {
	343	/* Fetch once the poll data */
	344	revents = LTTNG_POLL_GETEV(&events, i);
	345	pollfd = LTTNG_POLL_GETFD(&events, i);
	346
	347	/* Thread quit pipe has been closed. Killing thread. */
	348	ret = check_health_quit_pipe(pollfd, revents);
	349	if (ret) {
	350	err = 0;
	351	goto exit;
	352	}
	353
	354	/* Event on the registration socket */
	355	if (pollfd == sock) {
03e43155 MD	356	if (revents & LPOLLIN) {
	357	continue;
	358	} else if (revents & (LPOLLERR \| LPOLLHUP \| LPOLLRDHUP)) {
65931c8b MD	359	ERR("Health socket poll error");
65931c8b MD	360	goto error;
03e43155 MD	361	} else {
	362	ERR("Unexpected poll events %u for sock %d", revents, pollfd);
	363	goto error;
65931c8b MD	364	}
	365	}
	366	}
	367
	368	new_sock = lttcomm_accept_unix_sock(sock);
	369	if (new_sock < 0) {
	370	goto error;
	371	}
	372
	373	/*
	374	* Set the CLOEXEC flag. Return code is useless because either way, the
	375	* show must go on.
	376	*/
	377	(void) utils_set_fd_cloexec(new_sock);
	378
	379	DBG("Receiving data from client for health...");
	380	ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg));
	381	if (ret <= 0) {
	382	DBG("Nothing recv() from client... continuing");
	383	ret = close(new_sock);
	384	if (ret) {
	385	PERROR("close");
	386	}
	387	new_sock = -1;
	388	continue;
	389	}
	390
	391	rcu_thread_online();
	392
	393	assert(msg.cmd == HEALTH_CMD_CHECK);
	394
53efb85a	395	memset(&reply, 0, sizeof(reply));
65931c8b MD	396	for (i = 0; i < NR_HEALTH_RELAYD_TYPES; i++) {
	397	/*
	398	* health_check_state return 0 if thread is in
	399	* error.
	400	*/
	401	if (!health_check_state(health_relayd, i)) {
	402	reply.ret_code \|= 1ULL << i;
	403	}
	404	}
	405
	406	DBG2("Health check return value %" PRIx64, reply.ret_code);
	407
	408	ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply));
	409	if (ret < 0) {
	410	ERR("Failed to send health data back to client");
	411	}
	412
	413	/* End of transmission */
	414	ret = close(new_sock);
	415	if (ret) {
	416	PERROR("close");
	417	}
	418	new_sock = -1;
	419	}
	420
65931c8b	421	error:
81714439 JG	422	lttng_relay_stop_threads();
81714439 JG	423	exit:
65931c8b MD	424	if (err) {
	425	ERR("Health error occurred in %s", __func__);
	426	}
	427	DBG("Health check thread dying");
	428	unlink(health_unix_sock_path);
	429	if (sock >= 0) {
	430	ret = close(sock);
	431	if (ret) {
	432	PERROR("close");
	433	}
	434	}
	435
dcbcae3e MD	436	/*
	437	* We do NOT rmdir rundir nor the relayd path because there are
	438	* other processes using them.
	439	*/
	440
65931c8b MD	441	lttng_poll_clean(&events);
	442
	443	rcu_unregister_thread();
	444	return NULL;
	445	}