[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_stopped;
	enum lttng_error_code ret_code;
	struct lttng_destruction_handle *handle = NULL;
        enum lttng_destruction_handle_status status;
	bool printed_wait_msg = false;
	enum lttng_rotation_state rotation_state;

	ret = lttng_stop_tracing_no_wait(session->name);
	if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
		ERR("%s", lttng_strerror(ret));
	}
	session_was_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_wait_msg) {
					_MSG("Waiting for destruction of session \"%s\"",
							session->name);
					printed_wait_msg = true;
					fflush(stdout);
				}

				usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US);
				_MSG(".");
				fflush(stdout);
			}
		} while (ret != 0);
	}
	if (!session_was_stopped) {
		/*
		 * Don't print the event and packet loss warnings since the user
		 * already saw them when stopping the trace.
		 */
		print_session_stats(session->name);
	}

	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_wait_msg) {
				_MSG("Waiting for destruction of session \"%s\"",
						session->name);
				printed_wait_msg = true;
			}
			_MSG(".");
			fflush(stdout);
			break;
		case LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED:
			break;
		default:
			ERR("Failed to wait for the completion of the destruction of session \"%s\"",
					session->name);
			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("Failed to get the result of session destruction");
		ret = -1;
		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("Failed to get rotation state from destruction handle");
		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) {
			if (printed_wait_msg) {
				MSG("");
				printed_wait_msg = false;
			}
			ret = print_trace_archive_location(location,
					session->name);
			if (ret) {
				ERR("Failed to print the location of trace archive");
				goto skip_wait_rotation;
			}
			break;
		}
		/* fall-through. */
        }
        default:
		ERR("Failed to get the location of the rotation performed during the session's destruction");
		goto skip_wait_rotation;
	}
skip_wait_rotation:
	MSG("%sSession \"%s\" destroyed", printed_wait_msg ? "\n" : "",
			session->name);
	printed_wait_msg = false;

	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 (printed_wait_msg) {
		MSG("");
	}
	lttng_destruction_handle_destroy(handle);
	free(session_name);
	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>
bbbfd849	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;
20fb9e02	72	bool session_was_stopped;
bbbfd849 JG	73	enum lttng_error_code ret_code;
	74	struct lttng_destruction_handle *handle = NULL;
	75	enum lttng_destruction_handle_status status;
	76	bool printed_wait_msg = false;
	77	enum lttng_rotation_state rotation_state;
f3ed775e	78
e20ee7c2 JD	79	ret = lttng_stop_tracing_no_wait(session->name);
	80	if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
	81	ERR("%s", lttng_strerror(ret));
	82	}
20fb9e02	83	session_was_stopped = ret == -LTTNG_ERR_TRACE_ALREADY_STOPPED;
e20ee7c2	84	if (!opt_no_wait) {
e20ee7c2 JD	85	do {
	86	ret = lttng_data_pending(session->name);
	87	if (ret < 0) {
	88	/* Return the data available call error. */
	89	goto error;
	90	}
	91
	92	/*
	93	* Data sleep time before retrying (in usec). Don't sleep if the call
	94	* returned value indicates availability.
	95	*/
	96	if (ret) {
01f55be4	97	if (!printed_wait_msg) {
bbbfd849 JG	98	_MSG("Waiting for destruction of session \"%s\"",
	99	session->name);
	100	printed_wait_msg = true;
01f55be4 JG	101	fflush(stdout);
	102	}
	103
c8f61fd4	104	usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US);
e20ee7c2 JD	105	_MSG(".");
	106	fflush(stdout);
	107	}
	108	} while (ret != 0);
e20ee7c2	109	}
20fb9e02 JD	110	if (!session_was_stopped) {
	111	/*
	112	* Don't print the event and packet loss warnings since the user
	113	* already saw them when stopping the trace.
	114	*/
	115	print_session_stats(session->name);
	116	}
e20ee7c2	117
bbbfd849 JG	118	ret_code = lttng_destroy_session_ext(session->name, &handle);
	119	if (ret_code != LTTNG_OK) {
	120	ret = -ret_code;
b09ee5ba	121	goto error;
f3ed775e DG	122	}
f3ed775e DG	123
bbbfd849 JG	124	if (opt_no_wait) {
	125	goto skip_wait_rotation;
	126	}
	127
	128	do {
	129	status = lttng_destruction_handle_wait_for_completion(handle,
c8f61fd4	130	DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US / USEC_PER_MSEC);
bbbfd849 JG	131	switch (status) {
	132	case LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT:
	133	if (!printed_wait_msg) {
	134	_MSG("Waiting for destruction of session \"%s\"",
	135	session->name);
	136	printed_wait_msg = true;
	137	}
	138	_MSG(".");
	139	fflush(stdout);
	140	break;
	141	case LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED:
	142	break;
	143	default:
	144	ERR("Failed to wait for the completion of the destruction of session \"%s\"",
	145	session->name);
	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) {
	153	ERR("Failed to get the result of session destruction");
	154	ret = -1;
	155	goto error;
	156	}
	157	if (ret_code != LTTNG_OK) {
3285a971	158	ret = -ret_code;
bbbfd849 JG	159	goto error;
	160	}
	161
	162	status = lttng_destruction_handle_get_rotation_state(handle,
	163	&rotation_state);
7d81aa9f JG	164	if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
	165	ERR("Failed to get rotation state from destruction handle");
	166	goto skip_wait_rotation;
	167	}
bbbfd849 JG	168	switch (rotation_state) {
	169	case LTTNG_ROTATION_STATE_NO_ROTATION:
	170	break;
	171	case LTTNG_ROTATION_STATE_COMPLETED:
	172	{
	173	const struct lttng_trace_archive_location *location;
	174
	175	status = lttng_destruction_handle_get_archive_location(handle,
	176	&location);
	177	if (status == LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
	178	if (printed_wait_msg) {
	179	MSG("");
	180	printed_wait_msg = false;
	181	}
	182	ret = print_trace_archive_location(location,
	183	session->name);
	184	if (ret) {
	185	ERR("Failed to print the location of trace archive");
	186	goto skip_wait_rotation;
	187	}
	188	break;
	189	}
	190	/* fall-through. */
	191	}
	192	default:
	193	ERR("Failed to get the location of the rotation performed during the session's destruction");
	194	goto skip_wait_rotation;
	195	}
	196	skip_wait_rotation:
	197	MSG("%sSession \"%s\" destroyed", printed_wait_msg ? "\n" : "",
	198	session->name);
f16edb77	199	printed_wait_msg = false;
1dac0189 PPM	200
	201	session_name = get_session_name_quiet();
	202	if (session_name && !strncmp(session->name, session_name, NAME_MAX)) {
	203	config_destroy_default();
	204	}
65f25c66 JRJ	205
	206	if (lttng_opt_mi) {
	207	ret = mi_lttng_session(writer, session, 0);
	208	if (ret) {
	209	ret = CMD_ERROR;
	210	goto error;
	211	}
	212	}
	213
f3ed775e	214	ret = CMD_SUCCESS;
b09ee5ba	215	error:
f16edb77 JG	216	if (printed_wait_msg) {
	217	MSG("");
	218	}
bbbfd849	219	lttng_destruction_handle_destroy(handle);
1dac0189	220	free(session_name);
b09ee5ba FG	221	return ret;
b09ee5ba FG	222	}
f3ed775e	223
b09ee5ba FG	224	/*
	225	* destroy_all_sessions
	226	*
	227	* Call destroy_sessions for each registered sessions
	228	*/
65f25c66	229	static int destroy_all_sessions(struct lttng_session *sessions, int count)
b09ee5ba	230	{
3285a971 JG	231	int i;
3285a971 JG	232	bool error_occurred = false;
b09ee5ba	233
3285a971	234	assert(count >= 0);
b09ee5ba FG	235	if (count == 0) {
	236	MSG("No session found, nothing to do.");
	237	}
60e835ca	238
b09ee5ba	239	for (i = 0; i < count; i++) {
3285a971 JG	240	int ret = destroy_session(&sessions[i]);
3285a971 JG	241
b09ee5ba	242	if (ret < 0) {
3285a971 JG	243	ERR("%s during the destruction of session \"%s\"",
	244	lttng_strerror(ret),
	245	sessions[i].name);
	246	/* Continue to next session. */
	247	error_occurred = true;
b09ee5ba	248	}
b73d0b29	249	}
3285a971 JG	250
3285a971 JG	251	return error_occurred ? CMD_ERROR : CMD_SUCCESS;
f3ed775e DG	252	}
	253
	254	/*
843f5df9	255	* The 'destroy <options>' first level command
f3ed775e DG	256	*/
	257	int cmd_destroy(int argc, const char **argv)
	258	{
b09ee5ba	259	int opt;
65f25c66	260	int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1;
f3ed775e	261	static poptContext pc;
b09ee5ba	262	char *session_name = NULL;
68c7f6e5	263	const char *leftover = NULL;
f3ed775e	264
65f25c66 JRJ	265	struct lttng_session *sessions;
	266	int count;
	267	int found;
	268
f3ed775e DG	269	pc = poptGetContext(NULL, argc, argv, long_options, 0);
	270	poptReadDefaultConfig(pc, 0);
	271
	272	while ((opt = poptGetNextOpt(pc)) != -1) {
	273	switch (opt) {
	274	case OPT_HELP:
4ba92f18	275	SHOW_HELP();
b09ee5ba	276	break;
679b4943 SM	277	case OPT_LIST_OPTIONS:
679b4943 SM	278	list_cmd_options(stdout, long_options);
b09ee5ba	279	break;
f3ed775e	280	default:
f3ed775e	281	ret = CMD_UNDEFINED;
b09ee5ba	282	break;
f3ed775e	283	}
b09ee5ba	284	goto end;
f3ed775e DG	285	}
f3ed775e DG	286
65f25c66	287	/* Mi preparation */
c7e35b03	288	if (lttng_opt_mi) {
65f25c66 JRJ	289	writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
	290	if (!writer) {
	291	ret = -LTTNG_ERR_NOMEM;
	292	goto end;
	293	}
	294
	295	/* Open command element */
	296	ret = mi_lttng_writer_command_open(writer,
	297	mi_lttng_element_command_destroy);
	298	if (ret) {
	299	ret = CMD_ERROR;
	300	goto end;
	301	}
	302
	303	/* Open output element */
	304	ret = mi_lttng_writer_open_element(writer,
	305	mi_lttng_element_command_output);
	306	if (ret) {
	307	ret = CMD_ERROR;
	308	goto end;
	309	}
	310
	311	/* For validation and semantic purpose we open a sessions element */
	312	ret = mi_lttng_sessions_open(writer);
	313	if (ret) {
	314	ret = CMD_ERROR;
	315	goto end;
	316	}
	317	}
	318
	319	/* Recuperate all sessions for further operation */
	320	count = lttng_list_sessions(&sessions);
	321	if (count < 0) {
56c3ec9e JR	322	ERR("%s", lttng_strerror(count));
56c3ec9e JR	323	command_ret = CMD_ERROR;
65f25c66 JRJ	324	success = 0;
65f25c66 JRJ	325	goto mi_closing;
c7e35b03 JR	326	}
c7e35b03 JR	327
fd076c09	328	/* Ignore session name in case all sessions are to be destroyed */
b09ee5ba	329	if (opt_destroy_all) {
65f25c66 JRJ	330	command_ret = destroy_all_sessions(sessions, count);
	331	if (command_ret) {
	332	success = 0;
	333	}
	334	} else {
	335	opt_session_name = (char *) poptGetArg(pc);
	336
1dac0189	337	if (!opt_session_name) {
65f25c66 JRJ	338	/* No session name specified, lookup default */
	339	session_name = get_session_name();
	340	if (session_name == NULL) {
	341	command_ret = CMD_ERROR;
	342	success = 0;
	343	goto mi_closing;
	344	}
	345	} else {
	346	session_name = opt_session_name;
	347	}
fd076c09	348
65f25c66 JRJ	349	/* Find the corresponding lttng_session struct */
	350	found = 0;
	351	for (i = 0; i < count; i++) {
	352	if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
	353	found = 1;
	354	command_ret = destroy_session(&sessions[i]);
	355	if (command_ret) {
	356	success = 0;
3285a971 JG	357	ERR("%s during the destruction of session \"%s\"",
	358	lttng_strerror(command_ret),
	359	sessions[i].name);
65f25c66	360	}
65f25c66 JRJ	361	}
	362	}
	363
	364	if (!found) {
	365	ERR("Session name %s not found", session_name);
	366	command_ret = LTTNG_ERR_SESS_NOT_FOUND;
	367	success = 0;
	368	goto mi_closing;
	369	}
	370	}
	371
68c7f6e5 JD	372	leftover = poptGetArg(pc);
	373	if (leftover) {
	374	ERR("Unknown argument: %s", leftover);
	375	ret = CMD_ERROR;
	376	success = 0;
	377	goto mi_closing;
	378	}
	379
65f25c66 JRJ	380	mi_closing:
	381	/* Mi closing */
	382	if (lttng_opt_mi) {
	383	/* Close sessions and output element element */
	384	ret = mi_lttng_close_multi_element(writer, 2);
	385	if (ret) {
fd076c09	386	ret = CMD_ERROR;
b09ee5ba FG	387	goto end;
b09ee5ba FG	388	}
fd076c09	389
65f25c66 JRJ	390	/* Success ? */
	391	ret = mi_lttng_writer_write_element_bool(writer,
	392	mi_lttng_element_command_success, success);
	393	if (ret) {
	394	ret = CMD_ERROR;
	395	goto end;
	396	}
f3ed775e	397
65f25c66 JRJ	398	/* Command element close */
	399	ret = mi_lttng_writer_command_close(writer);
	400	if (ret) {
	401	ret = CMD_ERROR;
	402	goto end;
	403	}
	404	}
f3ed775e	405	end:
65f25c66 JRJ	406	/* Mi clean-up */
	407	if (writer && mi_lttng_writer_destroy(writer)) {
	408	/* Preserve original error code */
	409	ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
	410	}
	411
fd076c09	412	if (opt_session_name == NULL) {
b09ee5ba FG	413	free(session_name);
b09ee5ba FG	414	}
fd076c09	415
65f25c66 JRJ	416	/* Overwrite ret if an error occurred during destroy_session/all */
	417	ret = command_ret ? command_ret : ret;
	418
fd076c09	419	poptFreeContext(pc);
f3ed775e DG	420	return ret;
f3ed775e DG	421	}