[lttng-tools.git] / src / bin / lttng / commands / destroy.cpp

/*
 * Copyright (C) 2011 EfficiOS Inc.
 *
 * SPDX-License-Identifier: GPL-2.0-only
 *
 */

#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.hpp"

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

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;

	LTTNG_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 *arg_session_name = NULL;
	const char *leftover = NULL;

	struct lttng_session *sessions = NULL;
	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 {
		arg_session_name = poptGetArg(pc);

		if (!arg_session_name) {
			/* No session name specified, lookup default */
			session_name = get_session_name();
		} else {
			session_name = strdup(arg_session_name);
			if (session_name == NULL) {
				PERROR("Failed to copy session name");
			}
		}

		if (session_name == NULL) {
			command_ret = CMD_ERROR;
			success = 0;
			goto mi_closing;
		}

		/* 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;
	}

	free(session_name);
	free(sessions);

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

	poptFreeContext(pc);
	return ret;
}
Commit	Line	Data
f3ed775e	1	/*
21cf9b6b	2	* Copyright (C) 2011 EfficiOS Inc.
f3ed775e	3	*
ab5be9fa	4	* SPDX-License-Identifier: GPL-2.0-only
f3ed775e	5	*
f3ed775e DG	6	*/
f3ed775e DG	7
6c1c0768	8	#define _LGPL_SOURCE
f3ed775e DG	9	#include <popt.h>
	10	#include <stdio.h>
	11	#include <stdlib.h>
	12	#include <string.h>
	13	#include <sys/stat.h>
	14	#include <sys/types.h>
	15	#include <unistd.h>
20fb9e02	16	#include <stdbool.h>
bbbfd849	17	#include <lttng/lttng.h>
f3ed775e	18
c9e313bc	19	#include "../command.hpp"
f3ed775e	20
c9e313bc SM	21	#include <common/mi-lttng.hpp>
	22	#include <common/sessiond-comm/sessiond-comm.hpp>
	23	#include <common/utils.hpp>
42224349	24
b09ee5ba	25	static int opt_destroy_all;
e20ee7c2	26	static int opt_no_wait;
f3ed775e	27
4fc83d94 PP	28	#ifdef LTTNG_EMBED_HELP
	29	static const char help_msg[] =
	30	#include <lttng-destroy.1.h>
	31	;
	32	#endif
	33
65f25c66 JRJ	34	/* Mi writer */
	35	static struct mi_writer *writer;
	36
f3ed775e DG	37	enum {
f3ed775e DG	38	OPT_HELP = 1,
679b4943	39	OPT_LIST_OPTIONS,
f3ed775e DG	40	};
	41
	42	static struct poptOption long_options[] = {
	43	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	44	{"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
b09ee5ba	45	{"all", 'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0},
679b4943	46	{"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
e20ee7c2	47	{"no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0},
f3ed775e DG	48	{0, 0, 0, 0, 0, 0, 0}
	49	};
	50
f3ed775e	51	/*
b09ee5ba FG	52	* destroy_session
	53	*
	54	* Unregister the provided session to the session daemon. On success, removes
	55	* the default configuration.
f3ed775e	56	*/
65f25c66	57	static int destroy_session(struct lttng_session *session)
f3ed775e DG	58	{
f3ed775e DG	59	int ret;
1dac0189	60	char *session_name = NULL;
58f237ca	61	bool session_was_already_stopped;
bbbfd849 JG	62	enum lttng_error_code ret_code;
bbbfd849 JG	63	struct lttng_destruction_handle *handle = NULL;
58f237ca JG	64	enum lttng_destruction_handle_status status;
58f237ca JG	65	bool newline_needed = false, printed_destroy_msg = false;
bbbfd849	66	enum lttng_rotation_state rotation_state;
58f237ca	67	char *stats_str = NULL;
f3ed775e	68
e20ee7c2 JD	69	ret = lttng_stop_tracing_no_wait(session->name);
	70	if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
	71	ERR("%s", lttng_strerror(ret));
	72	}
58f237ca JG	73
58f237ca JG	74	session_was_already_stopped = ret == -LTTNG_ERR_TRACE_ALREADY_STOPPED;
e20ee7c2	75	if (!opt_no_wait) {
e20ee7c2 JD	76	do {
	77	ret = lttng_data_pending(session->name);
	78	if (ret < 0) {
	79	/* Return the data available call error. */
	80	goto error;
	81	}
	82
	83	/*
58f237ca JG	84	* Data sleep time before retrying (in usec). Don't
	85	* sleep if the call returned value indicates
	86	* availability.
e20ee7c2 JD	87	*/
e20ee7c2 JD	88	if (ret) {
dec2c8e1 JG	89	if (!printed_destroy_msg) {
	90	_MSG("Destroying session %s",
	91	session->name);
	92	newline_needed = true;
	93	printed_destroy_msg = true;
	94	fflush(stdout);
	95	}
01f55be4	96
c8f61fd4	97	usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US);
e20ee7c2 JD	98	_MSG(".");
	99	fflush(stdout);
	100	}
	101	} while (ret != 0);
e20ee7c2	102	}
58f237ca JG	103
58f237ca JG	104	if (!session_was_already_stopped) {
20fb9e02 JD	105	/*
	106	* Don't print the event and packet loss warnings since the user
	107	* already saw them when stopping the trace.
	108	*/
58f237ca JG	109	ret = get_session_stats_str(session->name, &stats_str);
	110	if (ret < 0) {
	111	goto error;
	112	}
20fb9e02	113	}
e20ee7c2	114
bbbfd849 JG	115	ret_code = lttng_destroy_session_ext(session->name, &handle);
	116	if (ret_code != LTTNG_OK) {
	117	ret = -ret_code;
b09ee5ba	118	goto error;
f3ed775e DG	119	}
f3ed775e DG	120
bbbfd849 JG	121	if (opt_no_wait) {
	122	goto skip_wait_rotation;
	123	}
	124
	125	do {
58f237ca JG	126	status = lttng_destruction_handle_wait_for_completion(
	127	handle, DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US /
	128	USEC_PER_MSEC);
bbbfd849 JG	129	switch (status) {
bbbfd849 JG	130	case LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT:
58f237ca JG	131	if (!printed_destroy_msg) {
	132	_MSG("Destroying session %s", session->name);
	133	newline_needed = true;
	134	printed_destroy_msg = true;
bbbfd849 JG	135	}
	136	_MSG(".");
	137	fflush(stdout);
	138	break;
	139	case LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED:
	140	break;
	141	default:
58f237ca JG	142	ERR("%sFailed to wait for the completion of the destruction of session \"%s\"",
58f237ca JG	143	newline_needed ? "\n" : "",
bbbfd849	144	session->name);
58f237ca	145	newline_needed = false;
bbbfd849 JG	146	ret = -1;
	147	goto error;
	148	}
	149	} while (status == LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT);
	150
	151	status = lttng_destruction_handle_get_result(handle, &ret_code);
	152	if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
58f237ca JG	153	ERR("%sFailed to get the result of session destruction",
58f237ca JG	154	newline_needed ? "\n" : "");
bbbfd849	155	ret = -1;
58f237ca	156	newline_needed = false;
bbbfd849 JG	157	goto error;
	158	}
	159	if (ret_code != LTTNG_OK) {
3285a971	160	ret = -ret_code;
bbbfd849 JG	161	goto error;
	162	}
	163
58f237ca JG	164	status = lttng_destruction_handle_get_rotation_state(
58f237ca JG	165	handle, &rotation_state);
7d81aa9f	166	if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
58f237ca JG	167	ERR("%sFailed to get rotation state from destruction handle",
	168	newline_needed ? "\n" : "");
	169	newline_needed = false;
7d81aa9f JG	170	goto skip_wait_rotation;
7d81aa9f JG	171	}
58f237ca	172
bbbfd849 JG	173	switch (rotation_state) {
	174	case LTTNG_ROTATION_STATE_NO_ROTATION:
	175	break;
58f237ca	176	case LTTNG_ROTATION_STATE_COMPLETED:
bbbfd849 JG	177	{
	178	const struct lttng_trace_archive_location *location;
	179
58f237ca JG	180	status = lttng_destruction_handle_get_archive_location(
58f237ca JG	181	handle, &location);
bbbfd849	182	if (status == LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
58f237ca JG	183	ret = print_trace_archive_location(
58f237ca JG	184	location, session->name);
bbbfd849	185	if (ret) {
58f237ca JG	186	ERR("%sFailed to print the location of trace archive",
	187	newline_needed ? "\n" : "");
	188	newline_needed = false;
bbbfd849 JG	189	goto skip_wait_rotation;
	190	}
	191	break;
	192	}
58f237ca	193	}
30eb3927	194	/* fall-through. */
58f237ca JG	195	default:
	196	ERR("%sFailed to get the location of the rotation performed during the session's destruction",
	197	newline_needed ? "\n" : "");
	198	newline_needed = false;
bbbfd849 JG	199	goto skip_wait_rotation;
	200	}
	201	skip_wait_rotation:
58f237ca	202	MSG("%sSession %s destroyed", newline_needed ? "\n" : "",
bbbfd849	203	session->name);
58f237ca JG	204	newline_needed = false;
	205	if (stats_str) {
	206	MSG("%s", stats_str);
	207	}
1dac0189 PPM	208
	209	session_name = get_session_name_quiet();
	210	if (session_name && !strncmp(session->name, session_name, NAME_MAX)) {
	211	config_destroy_default();
	212	}
65f25c66 JRJ	213
	214	if (lttng_opt_mi) {
	215	ret = mi_lttng_session(writer, session, 0);
	216	if (ret) {
	217	ret = CMD_ERROR;
	218	goto error;
	219	}
	220	}
	221
f3ed775e	222	ret = CMD_SUCCESS;
b09ee5ba	223	error:
58f237ca	224	if (newline_needed) {
f16edb77 JG	225	MSG("");
f16edb77 JG	226	}
bbbfd849	227	lttng_destruction_handle_destroy(handle);
1dac0189	228	free(session_name);
58f237ca	229	free(stats_str);
b09ee5ba FG	230	return ret;
b09ee5ba FG	231	}
f3ed775e	232
b09ee5ba FG	233	/*
	234	* destroy_all_sessions
	235	*
	236	* Call destroy_sessions for each registered sessions
	237	*/
65f25c66	238	static int destroy_all_sessions(struct lttng_session *sessions, int count)
b09ee5ba	239	{
3285a971 JG	240	int i;
3285a971 JG	241	bool error_occurred = false;
b09ee5ba	242
a0377dfe	243	LTTNG_ASSERT(count >= 0);
b09ee5ba FG	244	if (count == 0) {
	245	MSG("No session found, nothing to do.");
	246	}
60e835ca	247
b09ee5ba	248	for (i = 0; i < count; i++) {
3285a971 JG	249	int ret = destroy_session(&sessions[i]);
3285a971 JG	250
b09ee5ba	251	if (ret < 0) {
3285a971 JG	252	ERR("%s during the destruction of session \"%s\"",
	253	lttng_strerror(ret),
	254	sessions[i].name);
	255	/* Continue to next session. */
	256	error_occurred = true;
b09ee5ba	257	}
b73d0b29	258	}
3285a971 JG	259
3285a971 JG	260	return error_occurred ? CMD_ERROR : CMD_SUCCESS;
f3ed775e DG	261	}
	262
	263	/*
843f5df9	264	* The 'destroy <options>' first level command
f3ed775e DG	265	*/
	266	int cmd_destroy(int argc, const char **argv)
	267	{
b09ee5ba	268	int opt;
65f25c66	269	int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1;
f3ed775e	270	static poptContext pc;
b09ee5ba	271	char *session_name = NULL;
5b915816	272	const char *arg_session_name = NULL;
68c7f6e5	273	const char *leftover = NULL;
f3ed775e	274
6a8d2abc	275	struct lttng_session *sessions = NULL;
65f25c66 JRJ	276	int count;
	277	int found;
	278
f3ed775e DG	279	pc = poptGetContext(NULL, argc, argv, long_options, 0);
	280	poptReadDefaultConfig(pc, 0);
	281
	282	while ((opt = poptGetNextOpt(pc)) != -1) {
	283	switch (opt) {
	284	case OPT_HELP:
4ba92f18	285	SHOW_HELP();
b09ee5ba	286	break;
679b4943 SM	287	case OPT_LIST_OPTIONS:
679b4943 SM	288	list_cmd_options(stdout, long_options);
b09ee5ba	289	break;
f3ed775e	290	default:
f3ed775e	291	ret = CMD_UNDEFINED;
b09ee5ba	292	break;
f3ed775e	293	}
b09ee5ba	294	goto end;
f3ed775e DG	295	}
f3ed775e DG	296
65f25c66	297	/* Mi preparation */
c7e35b03	298	if (lttng_opt_mi) {
65f25c66 JRJ	299	writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
	300	if (!writer) {
	301	ret = -LTTNG_ERR_NOMEM;
	302	goto end;
	303	}
	304
	305	/* Open command element */
	306	ret = mi_lttng_writer_command_open(writer,
	307	mi_lttng_element_command_destroy);
	308	if (ret) {
	309	ret = CMD_ERROR;
	310	goto end;
	311	}
	312
	313	/* Open output element */
	314	ret = mi_lttng_writer_open_element(writer,
	315	mi_lttng_element_command_output);
	316	if (ret) {
	317	ret = CMD_ERROR;
	318	goto end;
	319	}
	320
	321	/* For validation and semantic purpose we open a sessions element */
	322	ret = mi_lttng_sessions_open(writer);
	323	if (ret) {
	324	ret = CMD_ERROR;
	325	goto end;
	326	}
	327	}
	328
	329	/* Recuperate all sessions for further operation */
	330	count = lttng_list_sessions(&sessions);
	331	if (count < 0) {
56c3ec9e JR	332	ERR("%s", lttng_strerror(count));
56c3ec9e JR	333	command_ret = CMD_ERROR;
65f25c66 JRJ	334	success = 0;
65f25c66 JRJ	335	goto mi_closing;
c7e35b03 JR	336	}
c7e35b03 JR	337
fd076c09	338	/* Ignore session name in case all sessions are to be destroyed */
b09ee5ba	339	if (opt_destroy_all) {
65f25c66 JRJ	340	command_ret = destroy_all_sessions(sessions, count);
	341	if (command_ret) {
	342	success = 0;
	343	}
	344	} else {
5b915816	345	arg_session_name = poptGetArg(pc);
65f25c66	346
5b915816	347	if (!arg_session_name) {
65f25c66 JRJ	348	/* No session name specified, lookup default */
65f25c66 JRJ	349	session_name = get_session_name();
5b915816 MJ	350	} else {
5b915816 MJ	351	session_name = strdup(arg_session_name);
65f25c66	352	if (session_name == NULL) {
5b915816	353	PERROR("Failed to copy session name");
65f25c66	354	}
5b915816 MJ	355	}
	356
	357	if (session_name == NULL) {
	358	command_ret = CMD_ERROR;
	359	success = 0;
	360	goto mi_closing;
65f25c66	361	}
fd076c09	362
65f25c66 JRJ	363	/* Find the corresponding lttng_session struct */
	364	found = 0;
	365	for (i = 0; i < count; i++) {
	366	if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
	367	found = 1;
	368	command_ret = destroy_session(&sessions[i]);
	369	if (command_ret) {
	370	success = 0;
3285a971 JG	371	ERR("%s during the destruction of session \"%s\"",
	372	lttng_strerror(command_ret),
	373	sessions[i].name);
65f25c66	374	}
65f25c66 JRJ	375	}
	376	}
	377
	378	if (!found) {
	379	ERR("Session name %s not found", session_name);
	380	command_ret = LTTNG_ERR_SESS_NOT_FOUND;
	381	success = 0;
	382	goto mi_closing;
	383	}
	384	}
	385
68c7f6e5 JD	386	leftover = poptGetArg(pc);
	387	if (leftover) {
	388	ERR("Unknown argument: %s", leftover);
	389	ret = CMD_ERROR;
	390	success = 0;
	391	goto mi_closing;
	392	}
	393
65f25c66 JRJ	394	mi_closing:
	395	/* Mi closing */
	396	if (lttng_opt_mi) {
	397	/* Close sessions and output element element */
	398	ret = mi_lttng_close_multi_element(writer, 2);
	399	if (ret) {
fd076c09	400	ret = CMD_ERROR;
b09ee5ba FG	401	goto end;
b09ee5ba FG	402	}
fd076c09	403
65f25c66 JRJ	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	}
f3ed775e	411
65f25c66 JRJ	412	/* Command element close */
	413	ret = mi_lttng_writer_command_close(writer);
	414	if (ret) {
	415	ret = CMD_ERROR;
	416	goto end;
	417	}
	418	}
f3ed775e	419	end:
65f25c66 JRJ	420	/* Mi clean-up */
	421	if (writer && mi_lttng_writer_destroy(writer)) {
	422	/* Preserve original error code */
	423	ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
	424	}
	425
5b915816	426	free(session_name);
6a8d2abc SM	427	free(sessions);
6a8d2abc SM	428
65f25c66 JRJ	429	/* Overwrite ret if an error occurred during destroy_session/all */
	430	ret = command_ret ? command_ret : ret;
	431
fd076c09	432	poptFreeContext(pc);
f3ed775e DG	433	return ret;
f3ed775e DG	434	}