[lttng-tools.git] / src / bin / lttng / commands / destroy.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, 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 <stdbool.h>
#include <lttng/lttng.h>

#include "../command.h"

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

static char *opt_session_name;
static int opt_destroy_all;
static int opt_no_wait;

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

/* Mi writer */
static struct mi_writer *writer;

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},
	{"all",       'a', POPT_ARG_VAL, &opt_destroy_all, 1, 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}
};

/*
 * destroy_session
 *
 * Unregister the provided session to the session daemon. On success, removes
 * the default configuration.
 */
static int destroy_session(struct lttng_session *session)
{
	int ret;
	char *session_name = NULL;
	bool session_was_already_stopped;
	enum lttng_error_code ret_code;
	struct lttng_destruction_handle *handle = NULL;
	enum lttng_destruction_handle_status status;
	bool newline_needed = false, printed_destroy_msg = false;
	enum lttng_rotation_state rotation_state;
	char *stats_str = NULL;

	ret = lttng_stop_tracing_no_wait(session->name);
	if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
		ERR("%s", lttng_strerror(ret));
	}

	session_was_already_stopped = ret == -LTTNG_ERR_TRACE_ALREADY_STOPPED;
	if (!opt_no_wait) {
		do {
			ret = lttng_data_pending(session->name);
			if (ret < 0) {
				/* Return the data available call error. */
				goto error;
			}

			/*
			 * Data sleep time before retrying (in usec). Don't
			 * sleep if the call returned value indicates
			 * availability.
			 */
			if (ret) {
				if (!printed_destroy_msg) {
					_MSG("Destroying session %s",
							session->name);
					newline_needed = true;
					printed_destroy_msg = true;
					fflush(stdout);
				}

				usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US);
				_MSG(".");
				fflush(stdout);
			}
		} while (ret != 0);
	}

	if (!session_was_already_stopped) {
		/*
		 * Don't print the event and packet loss warnings since the user
		 * already saw them when stopping the trace.
		 */
		ret = get_session_stats_str(session->name, &stats_str);
		if (ret < 0) {
			goto error;
		}
	}

	ret_code = lttng_destroy_session_ext(session->name, &handle);
	if (ret_code != LTTNG_OK) {
		ret = -ret_code;
		goto error;
	}

	if (opt_no_wait) {
		goto skip_wait_rotation;
	}

	do {
		status = lttng_destruction_handle_wait_for_completion(
				handle, DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US /
							USEC_PER_MSEC);
		switch (status) {
		case LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT:
			if (!printed_destroy_msg) {
				_MSG("Destroying session %s", session->name);
				newline_needed = true;
				printed_destroy_msg = true;
			}
			_MSG(".");
			fflush(stdout);
			break;
		case LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED:
			break;
		default:
			ERR("%sFailed to wait for the completion of the destruction of session \"%s\"",
					newline_needed ? "\n" : "",
					session->name);
			newline_needed = false;
			ret = -1;
			goto error;
		}
	} while (status == LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT);

	status = lttng_destruction_handle_get_result(handle, &ret_code);
	if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
		ERR("%sFailed to get the result of session destruction",
				newline_needed ? "\n" : "");
		ret = -1;
		newline_needed = false;
		goto error;
	}
	if (ret_code != LTTNG_OK) {
		ret = -ret_code;
		goto error;
	}

	status = lttng_destruction_handle_get_rotation_state(
			handle, &rotation_state);
	if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
		ERR("%sFailed to get rotation state from destruction handle",
				newline_needed ? "\n" : "");
		newline_needed = false;
		goto skip_wait_rotation;
	}

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

		status = lttng_destruction_handle_get_archive_location(
				handle, &location);
		if (status == LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
			ret = print_trace_archive_location(
					location, session->name);
			if (ret) {
				ERR("%sFailed to print the location of trace archive",
						newline_needed ? "\n" : "");
				newline_needed = false;
				goto skip_wait_rotation;
			}
			break;
		}
		/* fall-through. */
	}
	default:
		ERR("%sFailed to get the location of the rotation performed during the session's destruction",
				newline_needed ? "\n" : "");
		newline_needed = false;
		goto skip_wait_rotation;
	}
skip_wait_rotation:
	MSG("%sSession %s destroyed", newline_needed ? "\n" : "",
			session->name);
	newline_needed = false;
	if (stats_str) {
		MSG("%s", stats_str);
	}

	session_name = get_session_name_quiet();
	if (session_name && !strncmp(session->name, session_name, NAME_MAX)) {
		config_destroy_default();
	}

	if (lttng_opt_mi) {
		ret = mi_lttng_session(writer, session, 0);
		if (ret) {
			ret = CMD_ERROR;
			goto error;
		}
	}

	ret = CMD_SUCCESS;
error:
	if (newline_needed) {
		MSG("");
	}
	lttng_destruction_handle_destroy(handle);
	free(session_name);
	free(stats_str);
	return ret;
}

/*
 * destroy_all_sessions
 *
 * Call destroy_sessions for each registered sessions
 */
static int destroy_all_sessions(struct lttng_session *sessions, int count)
{
	int i;
	bool error_occurred = false;

	assert(count >= 0);
	if (count == 0) {
		MSG("No session found, nothing to do.");
	}

	for (i = 0; i < count; i++) {
		int ret = destroy_session(&sessions[i]);

		if (ret < 0) {
			ERR("%s during the destruction of session \"%s\"",
					lttng_strerror(ret),
					sessions[i].name);
			/* Continue to next session. */
			error_occurred = true;
		}
	}

	return error_occurred ? CMD_ERROR : CMD_SUCCESS;
}

/*
 * The 'destroy <options>' first level command
 */
int cmd_destroy(int argc, const char **argv)
{
	int opt;
	int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1;
	static poptContext pc;
	char *session_name = NULL;
	const char *leftover = NULL;

	struct lttng_session *sessions;
	int count;
	int found;

	pc = poptGetContext(NULL, argc, argv, long_options, 0);
	poptReadDefaultConfig(pc, 0);

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

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

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

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

		/* For validation and semantic purpose we open a sessions element */
		ret = mi_lttng_sessions_open(writer);
		if (ret) {
			ret = CMD_ERROR;
			goto end;
		}
	}

	/* Recuperate all sessions for further operation */
	count = lttng_list_sessions(&sessions);
	if (count < 0) {
		ERR("%s", lttng_strerror(count));
		command_ret = CMD_ERROR;
		success = 0;
		goto mi_closing;
	}

	/* Ignore session name in case all sessions are to be destroyed */
	if (opt_destroy_all) {
		command_ret = destroy_all_sessions(sessions, count);
		if (command_ret) {
			success = 0;
		}
	} else {
		opt_session_name = (char *) poptGetArg(pc);

		if (!opt_session_name) {
			/* No session name specified, lookup default */
			session_name = get_session_name();
			if (session_name == NULL) {
				command_ret = CMD_ERROR;
				success = 0;
				goto mi_closing;
			}
		} else {
			session_name = opt_session_name;
		}

		/* Find the corresponding lttng_session struct */
		found = 0;
		for (i = 0; i < count; i++) {
			if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
				found = 1;
				command_ret = destroy_session(&sessions[i]);
				if (command_ret) {
					success = 0;
					ERR("%s during the destruction of session \"%s\"",
							lttng_strerror(command_ret),
							sessions[i].name);
				}
			}
		}

		if (!found) {
			ERR("Session name %s not found", session_name);
			command_ret = LTTNG_ERR_SESS_NOT_FOUND;
			success = 0;
			goto mi_closing;
		}
	}

	leftover = poptGetArg(pc);
	if (leftover) {
		ERR("Unknown argument: %s", leftover);
		ret = CMD_ERROR;
		success = 0;
		goto mi_closing;
	}

mi_closing:
	/* Mi closing */
	if (lttng_opt_mi) {
		/* Close sessions and output element element */
		ret = mi_lttng_close_multi_element(writer, 2);
		if (ret) {
			ret = CMD_ERROR;
			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;
	}

	if (opt_session_name == NULL) {
		free(session_name);
	}

	/* Overwrite ret if an error occurred during destroy_session/all */
	ret = command_ret ? command_ret : ret;

	poptFreeContext(pc);
	return ret;
}
Commit	Line	Data
f3ed775e DG	1	/*
	2	* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
	3	*
d14d33bf AM	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.
f3ed775e DG	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	*
d14d33bf AM	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.
f3ed775e DG	16	*/
f3ed775e DG	17
6c1c0768	18	#define _LGPL_SOURCE
f3ed775e DG	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>
20fb9e02	26	#include <stdbool.h>
8bb32452	27	#include <lttng/lttng.h>
f3ed775e	28
c399183f	29	#include "../command.h"
f3ed775e	30
65f25c66	31	#include <common/mi-lttng.h>
42224349	32	#include <common/sessiond-comm/sessiond-comm.h>
1dac0189	33	#include <common/utils.h>
42224349	34
fd076c09	35	static char *opt_session_name;
b09ee5ba	36	static int opt_destroy_all;
e20ee7c2	37	static int opt_no_wait;
f3ed775e	38
4fc83d94 PP	39	#ifdef LTTNG_EMBED_HELP
	40	static const char help_msg[] =
	41	#include <lttng-destroy.1.h>
	42	;
	43	#endif
	44
65f25c66 JRJ	45	/* Mi writer */
	46	static struct mi_writer *writer;
	47
f3ed775e DG	48	enum {
f3ed775e DG	49	OPT_HELP = 1,
679b4943	50	OPT_LIST_OPTIONS,
f3ed775e DG	51	};
	52
	53	static struct poptOption long_options[] = {
	54	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	55	{"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
b09ee5ba	56	{"all", 'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0},
679b4943	57	{"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
e20ee7c2	58	{"no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0},
f3ed775e DG	59	{0, 0, 0, 0, 0, 0, 0}
	60	};
	61
f3ed775e	62	/*
b09ee5ba FG	63	* destroy_session
	64	*
	65	* Unregister the provided session to the session daemon. On success, removes
	66	* the default configuration.
f3ed775e	67	*/
65f25c66	68	static int destroy_session(struct lttng_session *session)
f3ed775e DG	69	{
f3ed775e DG	70	int ret;
1dac0189	71	char *session_name = NULL;
d316866a	72	bool session_was_already_stopped;
8bb32452 JG	73	enum lttng_error_code ret_code;
8bb32452 JG	74	struct lttng_destruction_handle *handle = NULL;
d316866a JG	75	enum lttng_destruction_handle_status status;
d316866a JG	76	bool newline_needed = false, printed_destroy_msg = false;
8bb32452	77	enum lttng_rotation_state rotation_state;
d316866a	78	char *stats_str = NULL;
f3ed775e	79
e20ee7c2 JD	80	ret = lttng_stop_tracing_no_wait(session->name);
	81	if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
	82	ERR("%s", lttng_strerror(ret));
	83	}
d316866a JG	84
d316866a JG	85	session_was_already_stopped = ret == -LTTNG_ERR_TRACE_ALREADY_STOPPED;
e20ee7c2	86	if (!opt_no_wait) {
e20ee7c2 JD	87	do {
	88	ret = lttng_data_pending(session->name);
	89	if (ret < 0) {
	90	/* Return the data available call error. */
	91	goto error;
	92	}
	93
	94	/*
d316866a JG	95	* Data sleep time before retrying (in usec). Don't
	96	* sleep if the call returned value indicates
	97	* availability.
e20ee7c2 JD	98	*/
e20ee7c2 JD	99	if (ret) {
7e182a6e JG	100	if (!printed_destroy_msg) {
	101	_MSG("Destroying session %s",
	102	session->name);
	103	newline_needed = true;
	104	printed_destroy_msg = true;
	105	fflush(stdout);
	106	}
01f55be4	107
ea0f4f56	108	usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US);
e20ee7c2 JD	109	_MSG(".");
	110	fflush(stdout);
	111	}
	112	} while (ret != 0);
e20ee7c2	113	}
d316866a JG	114
d316866a JG	115	if (!session_was_already_stopped) {
20fb9e02 JD	116	/*
	117	* Don't print the event and packet loss warnings since the user
	118	* already saw them when stopping the trace.
	119	*/
d316866a JG	120	ret = get_session_stats_str(session->name, &stats_str);
	121	if (ret < 0) {
	122	goto error;
	123	}
20fb9e02	124	}
e20ee7c2	125
8bb32452 JG	126	ret_code = lttng_destroy_session_ext(session->name, &handle);
	127	if (ret_code != LTTNG_OK) {
	128	ret = -ret_code;
b09ee5ba	129	goto error;
f3ed775e DG	130	}
f3ed775e DG	131
8bb32452 JG	132	if (opt_no_wait) {
	133	goto skip_wait_rotation;
	134	}
	135
	136	do {
d316866a JG	137	status = lttng_destruction_handle_wait_for_completion(
	138	handle, DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US /
	139	USEC_PER_MSEC);
8bb32452 JG	140	switch (status) {
8bb32452 JG	141	case LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT:
d316866a JG	142	if (!printed_destroy_msg) {
	143	_MSG("Destroying session %s", session->name);
	144	newline_needed = true;
	145	printed_destroy_msg = true;
8bb32452 JG	146	}
	147	_MSG(".");
	148	fflush(stdout);
	149	break;
	150	case LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED:
	151	break;
	152	default:
d316866a JG	153	ERR("%sFailed to wait for the completion of the destruction of session \"%s\"",
d316866a JG	154	newline_needed ? "\n" : "",
8bb32452	155	session->name);
d316866a	156	newline_needed = false;
8bb32452 JG	157	ret = -1;
	158	goto error;
	159	}
	160	} while (status == LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT);
	161
	162	status = lttng_destruction_handle_get_result(handle, &ret_code);
	163	if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
d316866a JG	164	ERR("%sFailed to get the result of session destruction",
d316866a JG	165	newline_needed ? "\n" : "");
8bb32452	166	ret = -1;
d316866a	167	newline_needed = false;
8bb32452 JG	168	goto error;
	169	}
	170	if (ret_code != LTTNG_OK) {
57b5b1cf	171	ret = -ret_code;
8bb32452 JG	172	goto error;
	173	}
	174
d316866a JG	175	status = lttng_destruction_handle_get_rotation_state(
d316866a JG	176	handle, &rotation_state);
711a9f39	177	if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
d316866a JG	178	ERR("%sFailed to get rotation state from destruction handle",
	179	newline_needed ? "\n" : "");
	180	newline_needed = false;
711a9f39 JG	181	goto skip_wait_rotation;
711a9f39 JG	182	}
d316866a	183
8bb32452 JG	184	switch (rotation_state) {
	185	case LTTNG_ROTATION_STATE_NO_ROTATION:
	186	break;
d316866a	187	case LTTNG_ROTATION_STATE_COMPLETED:
8bb32452 JG	188	{
	189	const struct lttng_trace_archive_location *location;
	190
d316866a JG	191	status = lttng_destruction_handle_get_archive_location(
d316866a JG	192	handle, &location);
8bb32452	193	if (status == LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
d316866a JG	194	ret = print_trace_archive_location(
d316866a JG	195	location, session->name);
8bb32452	196	if (ret) {
d316866a JG	197	ERR("%sFailed to print the location of trace archive",
	198	newline_needed ? "\n" : "");
	199	newline_needed = false;
8bb32452 JG	200	goto skip_wait_rotation;
	201	}
	202	break;
	203	}
	204	/* fall-through. */
d316866a JG	205	}
	206	default:
	207	ERR("%sFailed to get the location of the rotation performed during the session's destruction",
	208	newline_needed ? "\n" : "");
	209	newline_needed = false;
8bb32452 JG	210	goto skip_wait_rotation;
	211	}
	212	skip_wait_rotation:
d316866a	213	MSG("%sSession %s destroyed", newline_needed ? "\n" : "",
8bb32452	214	session->name);
d316866a JG	215	newline_needed = false;
	216	if (stats_str) {
	217	MSG("%s", stats_str);
	218	}
1dac0189 PPM	219
	220	session_name = get_session_name_quiet();
	221	if (session_name && !strncmp(session->name, session_name, NAME_MAX)) {
	222	config_destroy_default();
	223	}
65f25c66 JRJ	224
	225	if (lttng_opt_mi) {
	226	ret = mi_lttng_session(writer, session, 0);
	227	if (ret) {
	228	ret = CMD_ERROR;
	229	goto error;
	230	}
	231	}
	232
f3ed775e	233	ret = CMD_SUCCESS;
b09ee5ba	234	error:
d316866a	235	if (newline_needed) {
26603837 JG	236	MSG("");
26603837 JG	237	}
8bb32452	238	lttng_destruction_handle_destroy(handle);
1dac0189	239	free(session_name);
d316866a	240	free(stats_str);
b09ee5ba FG	241	return ret;
b09ee5ba FG	242	}
f3ed775e	243
b09ee5ba FG	244	/*
	245	* destroy_all_sessions
	246	*
	247	* Call destroy_sessions for each registered sessions
	248	*/
65f25c66	249	static int destroy_all_sessions(struct lttng_session *sessions, int count)
b09ee5ba	250	{
57b5b1cf JG	251	int i;
57b5b1cf JG	252	bool error_occurred = false;
b09ee5ba	253
57b5b1cf	254	assert(count >= 0);
b09ee5ba FG	255	if (count == 0) {
	256	MSG("No session found, nothing to do.");
	257	}
60e835ca	258
b09ee5ba	259	for (i = 0; i < count; i++) {
57b5b1cf JG	260	int ret = destroy_session(&sessions[i]);
57b5b1cf JG	261
b09ee5ba	262	if (ret < 0) {
57b5b1cf JG	263	ERR("%s during the destruction of session \"%s\"",
	264	lttng_strerror(ret),
	265	sessions[i].name);
	266	/* Continue to next session. */
	267	error_occurred = true;
b09ee5ba	268	}
b73d0b29	269	}
57b5b1cf JG	270
57b5b1cf JG	271	return error_occurred ? CMD_ERROR : CMD_SUCCESS;
f3ed775e DG	272	}
	273
	274	/*
843f5df9	275	* The 'destroy <options>' first level command
f3ed775e DG	276	*/
	277	int cmd_destroy(int argc, const char **argv)
	278	{
b09ee5ba	279	int opt;
65f25c66	280	int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1;
f3ed775e	281	static poptContext pc;
b09ee5ba	282	char *session_name = NULL;
68c7f6e5	283	const char *leftover = NULL;
f3ed775e	284
65f25c66 JRJ	285	struct lttng_session *sessions;
	286	int count;
	287	int found;
	288
f3ed775e DG	289	pc = poptGetContext(NULL, argc, argv, long_options, 0);
	290	poptReadDefaultConfig(pc, 0);
	291
	292	while ((opt = poptGetNextOpt(pc)) != -1) {
	293	switch (opt) {
	294	case OPT_HELP:
4ba92f18	295	SHOW_HELP();
b09ee5ba	296	break;
679b4943 SM	297	case OPT_LIST_OPTIONS:
679b4943 SM	298	list_cmd_options(stdout, long_options);
b09ee5ba	299	break;
f3ed775e	300	default:
f3ed775e	301	ret = CMD_UNDEFINED;
b09ee5ba	302	break;
f3ed775e	303	}
b09ee5ba	304	goto end;
f3ed775e DG	305	}
f3ed775e DG	306
65f25c66	307	/* Mi preparation */
c7e35b03	308	if (lttng_opt_mi) {
65f25c66 JRJ	309	writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
	310	if (!writer) {
	311	ret = -LTTNG_ERR_NOMEM;
	312	goto end;
	313	}
	314
	315	/* Open command element */
	316	ret = mi_lttng_writer_command_open(writer,
	317	mi_lttng_element_command_destroy);
	318	if (ret) {
	319	ret = CMD_ERROR;
	320	goto end;
	321	}
	322
	323	/* Open output element */
	324	ret = mi_lttng_writer_open_element(writer,
	325	mi_lttng_element_command_output);
	326	if (ret) {
	327	ret = CMD_ERROR;
	328	goto end;
	329	}
	330
	331	/* For validation and semantic purpose we open a sessions element */
	332	ret = mi_lttng_sessions_open(writer);
	333	if (ret) {
	334	ret = CMD_ERROR;
	335	goto end;
	336	}
	337	}
	338
	339	/* Recuperate all sessions for further operation */
	340	count = lttng_list_sessions(&sessions);
	341	if (count < 0) {
56c3ec9e JR	342	ERR("%s", lttng_strerror(count));
56c3ec9e JR	343	command_ret = CMD_ERROR;
65f25c66 JRJ	344	success = 0;
65f25c66 JRJ	345	goto mi_closing;
c7e35b03 JR	346	}
c7e35b03 JR	347
fd076c09	348	/* Ignore session name in case all sessions are to be destroyed */
b09ee5ba	349	if (opt_destroy_all) {
65f25c66 JRJ	350	command_ret = destroy_all_sessions(sessions, count);
	351	if (command_ret) {
	352	success = 0;
	353	}
	354	} else {
	355	opt_session_name = (char *) poptGetArg(pc);
	356
1dac0189	357	if (!opt_session_name) {
65f25c66 JRJ	358	/* No session name specified, lookup default */
	359	session_name = get_session_name();
	360	if (session_name == NULL) {
	361	command_ret = CMD_ERROR;
	362	success = 0;
	363	goto mi_closing;
	364	}
	365	} else {
	366	session_name = opt_session_name;
	367	}
fd076c09	368
65f25c66 JRJ	369	/* Find the corresponding lttng_session struct */
	370	found = 0;
	371	for (i = 0; i < count; i++) {
	372	if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
	373	found = 1;
	374	command_ret = destroy_session(&sessions[i]);
	375	if (command_ret) {
	376	success = 0;
57b5b1cf JG	377	ERR("%s during the destruction of session \"%s\"",
	378	lttng_strerror(command_ret),
	379	sessions[i].name);
65f25c66	380	}
65f25c66 JRJ	381	}
	382	}
	383
	384	if (!found) {
	385	ERR("Session name %s not found", session_name);
	386	command_ret = LTTNG_ERR_SESS_NOT_FOUND;
	387	success = 0;
	388	goto mi_closing;
	389	}
	390	}
	391
68c7f6e5 JD	392	leftover = poptGetArg(pc);
	393	if (leftover) {
	394	ERR("Unknown argument: %s", leftover);
	395	ret = CMD_ERROR;
	396	success = 0;
	397	goto mi_closing;
	398	}
	399
65f25c66 JRJ	400	mi_closing:
	401	/* Mi closing */
	402	if (lttng_opt_mi) {
	403	/* Close sessions and output element element */
	404	ret = mi_lttng_close_multi_element(writer, 2);
	405	if (ret) {
fd076c09	406	ret = CMD_ERROR;
b09ee5ba FG	407	goto end;
b09ee5ba FG	408	}
fd076c09	409
65f25c66 JRJ	410	/* Success ? */
	411	ret = mi_lttng_writer_write_element_bool(writer,
	412	mi_lttng_element_command_success, success);
	413	if (ret) {
	414	ret = CMD_ERROR;
	415	goto end;
	416	}
f3ed775e	417
65f25c66 JRJ	418	/* Command element close */
	419	ret = mi_lttng_writer_command_close(writer);
	420	if (ret) {
	421	ret = CMD_ERROR;
	422	goto end;
	423	}
	424	}
f3ed775e	425	end:
65f25c66 JRJ	426	/* Mi clean-up */
	427	if (writer && mi_lttng_writer_destroy(writer)) {
	428	/* Preserve original error code */
	429	ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
	430	}
	431
fd076c09	432	if (opt_session_name == NULL) {
b09ee5ba FG	433	free(session_name);
b09ee5ba FG	434	}
fd076c09	435
65f25c66 JRJ	436	/* Overwrite ret if an error occurred during destroy_session/all */
	437	ret = command_ret ? command_ret : ret;
	438
fd076c09	439	poptFreeContext(pc);
f3ed775e DG	440	return ret;
f3ed775e DG	441	}