[lttng-tools.git] / src / bin / lttng / commands / rotate.c

/*
 * Copyright (C) 2017 - Julien Desfossez <jdesfossez@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 <popt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <inttypes.h>
#include <ctype.h>
#include <assert.h>

#include <common/sessiond-comm/sessiond-comm.h>
#include <common/mi-lttng.h>

#include "../command.h"
#include <lttng/rotation.h>
#include <lttng/location.h>

static char *opt_session_name;
static int opt_no_wait;
static struct mi_writer *writer;

#ifdef LTTNG_EMBED_HELP
static const char help_msg[] =
#include <lttng-rotate.1.h>
;
#endif

enum {
	OPT_HELP = 1,
	OPT_LIST_OPTIONS,
};

static struct poptOption long_options[] = {
	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	{"help",      'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
	{"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
	{"no-wait",   'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0},
	{0, 0, 0, 0, 0, 0, 0}
};

static int mi_output_rotate(const char *status, const char *path,
		const char *session_name)
{
	int ret;

	if (!lttng_opt_mi) {
		ret = 0;
		goto end;
	}

	ret = mi_lttng_writer_open_element(writer,
			mi_lttng_element_rotation);
	if (ret) {
		goto end;
	}

	ret = mi_lttng_writer_write_element_string(writer,
			mi_lttng_element_session_name, session_name);
	if (ret) {
		goto end;
	}

	ret = mi_lttng_writer_write_element_string(writer,
			mi_lttng_element_rotate_status, status);
	if (ret) {
		goto end;
	}
	if (path) {
		ret = mi_lttng_writer_write_element_string(writer,
				config_element_path, path);
		if (ret) {
			goto end;
		}
	}
	/* Close rotation element */
	ret = mi_lttng_writer_close_element(writer);
	if (ret) {
		goto end;
	}

end:
	return ret;
}

static int output_trace_archive_location(
		const struct lttng_trace_archive_location *location,
		const char *session_name)
{
	int ret = 0;
	enum lttng_trace_archive_location_type location_type;
	enum lttng_trace_archive_location_status status;
	bool printed_location = false;

	location_type = lttng_trace_archive_location_get_type(location);

	_MSG("Trace chunk archive for session %s is now readable",
			session_name);
	switch (location_type) {
	case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL:
	{
		const char *absolute_path;

		status = lttng_trace_archive_location_local_get_absolute_path(
				location, &absolute_path);
		if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
			ret = -1;
			goto end;
		}
		MSG(" at %s", absolute_path);
		ret = mi_output_rotate("completed", absolute_path,
				session_name);
		if (ret) {
			goto end;
		}
		printed_location = true;
		break;
	}
	case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY:
	{
		uint16_t control_port, data_port;
		const char *host, *relative_path, *protocol_str;
		enum lttng_trace_archive_location_relay_protocol_type protocol;

		/* Fetch all relay location parameters. */
		status = lttng_trace_archive_location_relay_get_protocol_type(
				location, &protocol);
		if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
			ret = -1;
			goto end;
		}

		status = lttng_trace_archive_location_relay_get_host(
				location, &host);
		if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
			ret = -1;
			goto end;
		}

		status = lttng_trace_archive_location_relay_get_control_port(
				location, &control_port);
		if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
			ret = -1;
			goto end;
		}

		status = lttng_trace_archive_location_relay_get_data_port(
				location, &data_port);
		if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
			ret = -1;
			goto end;
		}

		status = lttng_trace_archive_location_relay_get_relative_path(
				location, &relative_path);
		if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
			ret = -1;
			goto end;
		}

		switch (protocol) {
		case LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP:
			protocol_str = "tcp";
			break;
		default:
			protocol_str = "unknown";
			break;
		}

		MSG(" on relay %s://%s/%s [control port %" PRIu16 ", data port %"
				PRIu16 "]", protocol_str, host,
				relative_path, control_port, data_port);
		printed_location = true;
		ret = mi_output_rotate("completed", relative_path,
				session_name);
		if (ret) {
			goto end;
		}
		break;
	}
	default:
		break;
	}
end:
	if (!printed_location) {
		MSG(" at an unknown location");
	}
	return ret;
}

static int rotate_tracing(char *session_name)
{
	int ret;
	struct lttng_rotation_handle *handle = NULL;
	enum lttng_rotation_status rotation_status;
	enum lttng_rotation_state rotation_state = LTTNG_ROTATION_STATE_ONGOING;

	DBG("Rotating the output files of session %s", session_name);

	ret = lttng_rotate_session(session_name, NULL, &handle);
	if (ret < 0) {
		switch (-ret) {
		case LTTNG_ERR_SESSION_NOT_STARTED:
			WARN("Tracing session %s not started yet", session_name);
			break;
		default:
			ERR("%s", lttng_strerror(ret));
			break;
		}
		goto error;
	}

	if (!opt_no_wait) {
		_MSG("Waiting for rotation to complete");
		ret = fflush(stdout);
		if (ret) {
			PERROR("fflush");
			goto error;
		}

		do {
			rotation_status = lttng_rotation_handle_get_state(handle,
					&rotation_state);
			if (rotation_status != LTTNG_ROTATION_STATUS_OK) {
				ERR("Failed to query the state of the rotation");
				goto error;
			}

			/*
			 * Data sleep time before retrying (in usec). Don't
			 * sleep if the call returned value indicates
			 * availability.
			 */
			if (rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
				ret = usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
				if (ret) {
					PERROR("usleep");
					goto error;
				}
				_MSG(".");

				ret = fflush(stdout);
				if (ret) {
					PERROR("fflush");
					goto error;
				}
			}
		} while (rotation_state == LTTNG_ROTATION_STATE_ONGOING);
		MSG("");
	}

	switch (rotation_state) {
	case LTTNG_ROTATION_STATE_COMPLETED:
	{
		const struct lttng_trace_archive_location *location;

		rotation_status = lttng_rotation_handle_get_archive_location(
				handle, &location);
		if (rotation_status != LTTNG_ROTATION_STATUS_OK) {
			ERR("Failed to retrieve the rotation's completed chunk archive location");
			goto error;
		}
		ret = output_trace_archive_location(location, session_name);
		if (ret) {
			goto error;
		}
		ret = CMD_SUCCESS;
		goto end;
	}
	case LTTNG_ROTATION_STATE_EXPIRED:
		MSG("Session %s rotated, but handle expired", session_name);
		ret = mi_output_rotate("expired", NULL, session_name);
		if (ret) {
			goto error;
		}
		ret = CMD_SUCCESS;
		goto end;
	default:
		ERR("Unexpected rotation state received, aborting...");
		goto error;
	}

error:
	ret = CMD_ERROR;
end:
	lttng_rotation_handle_destroy(handle);
	return ret;
}

/*
 *  cmd_rotate
 *
 *  The 'rotate <options>' first level command
 */
int cmd_rotate(int argc, const char **argv)
{
	int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
	int popt_ret;
	static poptContext pc;
	char *session_name = NULL;
	bool free_session_name = false;

	pc = poptGetContext(NULL, argc, argv, long_options, 0);
	popt_ret = poptReadDefaultConfig(pc, 0);
	if (popt_ret) {
		ret = CMD_ERROR;
		ERR("poptReadDefaultConfig");
		goto end;
	}

	while ((opt = poptGetNextOpt(pc)) != -1) {
		switch (opt) {
		case OPT_HELP:
			SHOW_HELP();
			goto end;
		case OPT_LIST_OPTIONS:
			list_cmd_options(stdout, long_options);
			goto end;
		default:
			ret = CMD_UNDEFINED;
			goto end;
		}
	}

	opt_session_name = (char*) poptGetArg(pc);

	if (!opt_session_name) {
		session_name = get_session_name();
		if (!session_name) {
			goto end;
		}
		free_session_name = true;
	} else {
		session_name = opt_session_name;
	}

	/* Mi check */
	if (lttng_opt_mi) {
		writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
		if (!writer) {
			ret = -LTTNG_ERR_NOMEM;
			goto end;
		}

		/* Open rotate command */
		ret = mi_lttng_writer_command_open(writer,
				mi_lttng_element_command_rotate);
		if (ret) {
			ret = CMD_ERROR;
			goto end;
		}

		/* Open output element */
		ret = mi_lttng_writer_open_element(writer,
				mi_lttng_element_command_output);
		if (ret) {
			goto end;
		}

		/* Open rotations element */
		ret = mi_lttng_writer_open_element(writer,
				mi_lttng_element_rotations);
		if (ret) {
			goto end;
		}

	}

	command_ret = rotate_tracing(session_name);
	if (command_ret) {
		success = 0;
	}

	/* Mi closing */
	if (lttng_opt_mi) {
		/* Close  rotations element */
		ret = mi_lttng_writer_close_element(writer);
		if (ret) {
			goto end;
		}
		/* Close  output element */
		ret = mi_lttng_writer_close_element(writer);
		if (ret) {
			goto end;
		}
		/* Success ? */
		ret = mi_lttng_writer_write_element_bool(writer,
				mi_lttng_element_command_success, success);
		if (ret) {
			ret = CMD_ERROR;
			goto end;
		}

		/* Command element close */
		ret = mi_lttng_writer_command_close(writer);
		if (ret) {
			ret = CMD_ERROR;
			goto end;
		}
	}

end:
	/* Mi clean-up */
	if (writer && mi_lttng_writer_destroy(writer)) {
		/* Preserve original error code */
		ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
	}

	/* Overwrite ret if an error occurred with start_tracing */
	ret = command_ret ? command_ret : ret;
	poptFreeContext(pc);
	if (free_session_name) {
		free(session_name);
	}
	return ret;
}
Commit	Line	Data
d68c9a04 JD	1	/*
	2	* Copyright (C) 2017 - Julien Desfossez <jdesfossez@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
	18	#define _LGPL_SOURCE
	19	#include <popt.h>
	20	#include <stdio.h>
	21	#include <stdlib.h>
	22	#include <string.h>
	23	#include <sys/stat.h>
	24	#include <sys/types.h>
	25	#include <unistd.h>
	26	#include <inttypes.h>
	27	#include <ctype.h>
	28	#include <assert.h>
	29
	30	#include <common/sessiond-comm/sessiond-comm.h>
	31	#include <common/mi-lttng.h>
	32
	33	#include "../command.h"
	34	#include <lttng/rotation.h>
dd73d57b	35	#include <lttng/location.h>
d68c9a04 JD	36
	37	static char *opt_session_name;
	38	static int opt_no_wait;
	39	static struct mi_writer *writer;
	40
3ae5c539 JD	41	#ifdef LTTNG_EMBED_HELP
	42	static const char help_msg[] =
	43	#include <lttng-rotate.1.h>
	44	;
	45	#endif
	46
d68c9a04 JD	47	enum {
	48	OPT_HELP = 1,
	49	OPT_LIST_OPTIONS,
	50	};
	51
	52	static struct poptOption long_options[] = {
	53	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	54	{"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
	55	{"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
	56	{"no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0},
	57	{0, 0, 0, 0, 0, 0, 0}
	58	};
	59
	60	static int mi_output_rotate(const char status, const char path,
	61	const char *session_name)
	62	{
	63	int ret;
	64
	65	if (!lttng_opt_mi) {
	66	ret = 0;
	67	goto end;
	68	}
	69
	70	ret = mi_lttng_writer_open_element(writer,
	71	mi_lttng_element_rotation);
	72	if (ret) {
	73	goto end;
	74	}
	75
	76	ret = mi_lttng_writer_write_element_string(writer,
	77	mi_lttng_element_session_name, session_name);
	78	if (ret) {
	79	goto end;
	80	}
	81
	82	ret = mi_lttng_writer_write_element_string(writer,
	83	mi_lttng_element_rotate_status, status);
	84	if (ret) {
	85	goto end;
	86	}
	87	if (path) {
	88	ret = mi_lttng_writer_write_element_string(writer,
	89	config_element_path, path);
	90	if (ret) {
	91	goto end;
	92	}
	93	}
	94	/* Close rotation element */
	95	ret = mi_lttng_writer_close_element(writer);
	96	if (ret) {
	97	goto end;
	98	}
	99
	100	end:
	101	return ret;
	102	}
	103
dd73d57b JG	104	static int output_trace_archive_location(
	105	const struct lttng_trace_archive_location *location,
	106	const char *session_name)
	107	{
	108	int ret = 0;
	109	enum lttng_trace_archive_location_type location_type;
	110	enum lttng_trace_archive_location_status status;
	111	bool printed_location = false;
	112
	113	location_type = lttng_trace_archive_location_get_type(location);
	114
	115	_MSG("Trace chunk archive for session %s is now readable",
	116	session_name);
	117	switch (location_type) {
	118	case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_LOCAL:
	119	{
	120	const char *absolute_path;
	121
	122	status = lttng_trace_archive_location_local_get_absolute_path(
	123	location, &absolute_path);
	124	if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
	125	ret = -1;
	126	goto end;
	127	}
	128	MSG(" at %s", absolute_path);
	129	ret = mi_output_rotate("completed", absolute_path,
	130	session_name);
	131	if (ret) {
	132	goto end;
	133	}
	134	printed_location = true;
	135	break;
	136	}
	137	case LTTNG_TRACE_ARCHIVE_LOCATION_TYPE_RELAY:
	138	{
	139	uint16_t control_port, data_port;
	140	const char host, relative_path, *protocol_str;
	141	enum lttng_trace_archive_location_relay_protocol_type protocol;
	142
	143	/* Fetch all relay location parameters. */
	144	status = lttng_trace_archive_location_relay_get_protocol_type(
	145	location, &protocol);
	146	if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
	147	ret = -1;
	148	goto end;
	149	}
	150
	151	status = lttng_trace_archive_location_relay_get_host(
	152	location, &host);
	153	if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
	154	ret = -1;
	155	goto end;
	156	}
	157
	158	status = lttng_trace_archive_location_relay_get_control_port(
	159	location, &control_port);
	160	if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
	161	ret = -1;
	162	goto end;
	163	}
	164
	165	status = lttng_trace_archive_location_relay_get_data_port(
	166	location, &data_port);
	167	if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
168	ret = -1;
169	goto end;
170	}
171
172	status = lttng_trace_archive_location_relay_get_relative_path(
173	location, &relative_path);
174	if (status != LTTNG_TRACE_ARCHIVE_LOCATION_STATUS_OK) {
175	ret = -1;
176	goto end;
177	}
178
179	switch (protocol) {
180	case LTTNG_TRACE_ARCHIVE_LOCATION_RELAY_PROTOCOL_TYPE_TCP:
181	protocol_str = "tcp";
182	break;
183	default:
184	protocol_str = "unknown";
185	break;
186	}
187
188	MSG(" on relay %s://%s/%s [control port %" PRIu16 ", data port %"
189	PRIu16 "]", protocol_str, host,
190	relative_path, control_port, data_port);
191	printed_location = true;
192	ret = mi_output_rotate("completed", relative_path,
193	session_name);
194	if (ret) {
195	goto end;
196	}
197	break;
198	}
199	default:
200	break;
201	}
202	end:
203	if (!printed_location) {
204	MSG(" at an unknown location");
205	}
206	return ret;
207	}
208
d68c9a04 JD	209	static int rotate_tracing(char *session_name)
	210	{
	211	int ret;
d68c9a04 JD	212	struct lttng_rotation_handle *handle = NULL;
	213	enum lttng_rotation_status rotation_status;
	214	enum lttng_rotation_state rotation_state = LTTNG_ROTATION_STATE_ONGOING;
	215
	216	DBG("Rotating the output files of session %s", session_name);
	217
dbd512ea	218	ret = lttng_rotate_session(session_name, NULL, &handle);
d68c9a04 JD	219	if (ret < 0) {
	220	switch (-ret) {
	221	case LTTNG_ERR_SESSION_NOT_STARTED:
	222	WARN("Tracing session %s not started yet", session_name);
	223	break;
	224	default:
	225	ERR("%s", lttng_strerror(ret));
	226	break;
	227	}
	228	goto error;
	229	}
	230
	231	if (!opt_no_wait) {
	232	_MSG("Waiting for rotation to complete");
	233	ret = fflush(stdout);
	234	if (ret) {
	235	PERROR("fflush");
	236	goto error;
	237	}
	238
	239	do {
	240	rotation_status = lttng_rotation_handle_get_state(handle,
	241	&rotation_state);
	242	if (rotation_status != LTTNG_ROTATION_STATUS_OK) {
	243	ERR("Failed to query the state of the rotation");
	244	goto error;
	245	}
	246
	247	/*
	248	* Data sleep time before retrying (in usec). Don't
	249	* sleep if the call returned value indicates
	250	* availability.
	251	*/
	252	if (rotation_state == LTTNG_ROTATION_STATE_ONGOING) {
	253	ret = usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME);
	254	if (ret) {
	255	PERROR("usleep");
	256	goto error;
	257	}
	258	_MSG(".");
	259
	260	ret = fflush(stdout);
	261	if (ret) {
	262	PERROR("fflush");
	263	goto error;
	264	}
	265	}
	266	} while (rotation_state == LTTNG_ROTATION_STATE_ONGOING);
	267	MSG("");
	268	}
	269
	270	switch (rotation_state) {
	271	case LTTNG_ROTATION_STATE_COMPLETED:
	272	{
dd73d57b	273	const struct lttng_trace_archive_location *location;
d68c9a04	274
dd73d57b JG	275	rotation_status = lttng_rotation_handle_get_archive_location(
dd73d57b JG	276	handle, &location);
d68c9a04 JD	277	if (rotation_status != LTTNG_ROTATION_STATUS_OK) {
	278	ERR("Failed to retrieve the rotation's completed chunk archive location");
	279	goto error;
	280	}
dd73d57b	281	ret = output_trace_archive_location(location, session_name);
d68c9a04 JD	282	if (ret) {
	283	goto error;
	284	}
	285	ret = CMD_SUCCESS;
	286	goto end;
	287	}
	288	case LTTNG_ROTATION_STATE_EXPIRED:
	289	MSG("Session %s rotated, but handle expired", session_name);
	290	ret = mi_output_rotate("expired", NULL, session_name);
	291	if (ret) {
	292	goto error;
	293	}
	294	ret = CMD_SUCCESS;
	295	goto end;
	296	default:
	297	ERR("Unexpected rotation state received, aborting...");
	298	goto error;
	299	}
	300
	301	error:
	302	ret = CMD_ERROR;
	303	end:
	304	lttng_rotation_handle_destroy(handle);
d68c9a04 JD	305	return ret;
	306	}
	307
	308	/*
	309	* cmd_rotate
	310	*
	311	* The 'rotate <options>' first level command
	312	*/
	313	int cmd_rotate(int argc, const char **argv)
	314	{
	315	int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
	316	int popt_ret;
	317	static poptContext pc;
	318	char *session_name = NULL;
	319	bool free_session_name = false;
	320
	321	pc = poptGetContext(NULL, argc, argv, long_options, 0);
	322	popt_ret = poptReadDefaultConfig(pc, 0);
	323	if (popt_ret) {
	324	ret = CMD_ERROR;
	325	ERR("poptReadDefaultConfig");
	326	goto end;
	327	}
	328
	329	while ((opt = poptGetNextOpt(pc)) != -1) {
	330	switch (opt) {
	331	case OPT_HELP:
	332	SHOW_HELP();
	333	goto end;
	334	case OPT_LIST_OPTIONS:
	335	list_cmd_options(stdout, long_options);
	336	goto end;
	337	default:
	338	ret = CMD_UNDEFINED;
	339	goto end;
	340	}
	341	}
	342
	343	opt_session_name = (char*) poptGetArg(pc);
	344
	345	if (!opt_session_name) {
	346	session_name = get_session_name();
	347	if (!session_name) {
	348	goto end;
	349	}
	350	free_session_name = true;
	351	} else {
	352	session_name = opt_session_name;
	353	}
	354
	355	/* Mi check */
	356	if (lttng_opt_mi) {
	357	writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
	358	if (!writer) {
	359	ret = -LTTNG_ERR_NOMEM;
	360	goto end;
	361	}
	362
	363	/* Open rotate command */
	364	ret = mi_lttng_writer_command_open(writer,
	365	mi_lttng_element_command_rotate);
	366	if (ret) {
	367	ret = CMD_ERROR;
	368	goto end;
369	}
370
371	/* Open output element */
372	ret = mi_lttng_writer_open_element(writer,
373	mi_lttng_element_command_output);
374	if (ret) {
375	goto end;
376	}
377
378	/* Open rotations element */
379	ret = mi_lttng_writer_open_element(writer,
380	mi_lttng_element_rotations);
381	if (ret) {
382	goto end;
383	}
384
385	}
386
387	command_ret = rotate_tracing(session_name);
388	if (command_ret) {
389	success = 0;
390	}
391
392	/* Mi closing */
393	if (lttng_opt_mi) {
394	/* Close rotations element */
395	ret = mi_lttng_writer_close_element(writer);
396	if (ret) {
397	goto end;
398	}
399	/* Close output element */
400	ret = mi_lttng_writer_close_element(writer);
401	if (ret) {
402	goto end;
403	}
404	/* Success ? */
405	ret = mi_lttng_writer_write_element_bool(writer,
406	mi_lttng_element_command_success, success);
407	if (ret) {
408	ret = CMD_ERROR;
409	goto end;
410	}
411
412	/* Command element close */
413	ret = mi_lttng_writer_command_close(writer);
414	if (ret) {
415	ret = CMD_ERROR;
416	goto end;
417	}
418	}
419
420	end:
421	/* Mi clean-up */
422	if (writer && mi_lttng_writer_destroy(writer)) {
423	/* Preserve original error code */
424	ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
425	}
426
427	/* Overwrite ret if an error occurred with start_tracing */
428	ret = command_ret ? command_ret : ret;
429	poptFreeContext(pc);
430	if (free_session_name) {
431	free(session_name);
432	}
433	return ret;
434	}