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

/*
 * Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
 *
 * 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.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) {
				_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	1	/*
ab5be9fa	2	* Copyright (C) 2011 David Goulet <david.goulet@polymtl.ca>
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
c399183f	19	#include "../command.h"
f3ed775e	20
65f25c66	21	#include <common/mi-lttng.h>
42224349	22	#include <common/sessiond-comm/sessiond-comm.h>
1dac0189	23	#include <common/utils.h>
42224349	24
fd076c09	25	static char *opt_session_name;
b09ee5ba	26	static int opt_destroy_all;
e20ee7c2	27	static int opt_no_wait;
f3ed775e	28
4fc83d94 PP	29	#ifdef LTTNG_EMBED_HELP
	30	static const char help_msg[] =
	31	#include <lttng-destroy.1.h>
	32	;
	33	#endif
	34
65f25c66 JRJ	35	/* Mi writer */
	36	static struct mi_writer *writer;
	37
f3ed775e DG	38	enum {
f3ed775e DG	39	OPT_HELP = 1,
679b4943	40	OPT_LIST_OPTIONS,
f3ed775e DG	41	};
	42
	43	static struct poptOption long_options[] = {
	44	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	45	{"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
b09ee5ba	46	{"all", 'a', POPT_ARG_VAL, &opt_destroy_all, 1, 0, 0},
679b4943	47	{"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
e20ee7c2	48	{"no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, 0, 0},
f3ed775e DG	49	{0, 0, 0, 0, 0, 0, 0}
	50	};
	51
f3ed775e	52	/*
b09ee5ba FG	53	* destroy_session
	54	*
	55	* Unregister the provided session to the session daemon. On success, removes
	56	* the default configuration.
f3ed775e	57	*/
65f25c66	58	static int destroy_session(struct lttng_session *session)
f3ed775e DG	59	{
f3ed775e DG	60	int ret;
1dac0189	61	char *session_name = NULL;
58f237ca	62	bool session_was_already_stopped;
bbbfd849 JG	63	enum lttng_error_code ret_code;
bbbfd849 JG	64	struct lttng_destruction_handle *handle = NULL;
58f237ca JG	65	enum lttng_destruction_handle_status status;
58f237ca JG	66	bool newline_needed = false, printed_destroy_msg = false;
bbbfd849	67	enum lttng_rotation_state rotation_state;
58f237ca	68	char *stats_str = NULL;
f3ed775e	69
e20ee7c2 JD	70	ret = lttng_stop_tracing_no_wait(session->name);
	71	if (ret < 0 && ret != -LTTNG_ERR_TRACE_ALREADY_STOPPED) {
	72	ERR("%s", lttng_strerror(ret));
	73	}
58f237ca JG	74
58f237ca JG	75	session_was_already_stopped = ret == -LTTNG_ERR_TRACE_ALREADY_STOPPED;
e20ee7c2	76	if (!opt_no_wait) {
e20ee7c2 JD	77	do {
	78	ret = lttng_data_pending(session->name);
	79	if (ret < 0) {
	80	/* Return the data available call error. */
	81	goto error;
	82	}
	83
	84	/*
58f237ca JG	85	* Data sleep time before retrying (in usec). Don't
	86	* sleep if the call returned value indicates
	87	* availability.
e20ee7c2 JD	88	*/
e20ee7c2 JD	89	if (ret) {
58f237ca JG	90	_MSG("Destroying session %s", session->name);
	91	newline_needed = true;
	92	printed_destroy_msg = true;
	93	fflush(stdout);
01f55be4	94
c8f61fd4	95	usleep(DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US);
e20ee7c2 JD	96	_MSG(".");
	97	fflush(stdout);
	98	}
	99	} while (ret != 0);
e20ee7c2	100	}
58f237ca JG	101
58f237ca JG	102	if (!session_was_already_stopped) {
20fb9e02 JD	103	/*
	104	* Don't print the event and packet loss warnings since the user
	105	* already saw them when stopping the trace.
	106	*/
58f237ca JG	107	ret = get_session_stats_str(session->name, &stats_str);
	108	if (ret < 0) {
	109	goto error;
	110	}
20fb9e02	111	}
e20ee7c2	112
bbbfd849 JG	113	ret_code = lttng_destroy_session_ext(session->name, &handle);
	114	if (ret_code != LTTNG_OK) {
	115	ret = -ret_code;
b09ee5ba	116	goto error;
f3ed775e DG	117	}
f3ed775e DG	118
bbbfd849 JG	119	if (opt_no_wait) {
	120	goto skip_wait_rotation;
	121	}
	122
	123	do {
58f237ca JG	124	status = lttng_destruction_handle_wait_for_completion(
	125	handle, DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US /
	126	USEC_PER_MSEC);
bbbfd849 JG	127	switch (status) {
bbbfd849 JG	128	case LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT:
58f237ca JG	129	if (!printed_destroy_msg) {
	130	_MSG("Destroying session %s", session->name);
	131	newline_needed = true;
	132	printed_destroy_msg = true;
bbbfd849 JG	133	}
	134	_MSG(".");
	135	fflush(stdout);
	136	break;
	137	case LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED:
	138	break;
	139	default:
58f237ca JG	140	ERR("%sFailed to wait for the completion of the destruction of session \"%s\"",
58f237ca JG	141	newline_needed ? "\n" : "",
bbbfd849	142	session->name);
58f237ca	143	newline_needed = false;
bbbfd849 JG	144	ret = -1;
	145	goto error;
	146	}
	147	} while (status == LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT);
	148
	149	status = lttng_destruction_handle_get_result(handle, &ret_code);
	150	if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
58f237ca JG	151	ERR("%sFailed to get the result of session destruction",
58f237ca JG	152	newline_needed ? "\n" : "");
bbbfd849	153	ret = -1;
58f237ca	154	newline_needed = false;
bbbfd849 JG	155	goto error;
	156	}
	157	if (ret_code != LTTNG_OK) {
3285a971	158	ret = -ret_code;
bbbfd849 JG	159	goto error;
	160	}
	161
58f237ca JG	162	status = lttng_destruction_handle_get_rotation_state(
58f237ca JG	163	handle, &rotation_state);
7d81aa9f	164	if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
58f237ca JG	165	ERR("%sFailed to get rotation state from destruction handle",
	166	newline_needed ? "\n" : "");
	167	newline_needed = false;
7d81aa9f JG	168	goto skip_wait_rotation;
7d81aa9f JG	169	}
58f237ca	170
bbbfd849 JG	171	switch (rotation_state) {
	172	case LTTNG_ROTATION_STATE_NO_ROTATION:
	173	break;
58f237ca	174	case LTTNG_ROTATION_STATE_COMPLETED:
bbbfd849 JG	175	{
	176	const struct lttng_trace_archive_location *location;
	177
58f237ca JG	178	status = lttng_destruction_handle_get_archive_location(
58f237ca JG	179	handle, &location);
bbbfd849	180	if (status == LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
58f237ca JG	181	ret = print_trace_archive_location(
58f237ca JG	182	location, session->name);
bbbfd849	183	if (ret) {
58f237ca JG	184	ERR("%sFailed to print the location of trace archive",
	185	newline_needed ? "\n" : "");
	186	newline_needed = false;
bbbfd849 JG	187	goto skip_wait_rotation;
	188	}
	189	break;
	190	}
	191	/* fall-through. */
58f237ca JG	192	}
	193	default:
	194	ERR("%sFailed to get the location of the rotation performed during the session's destruction",
	195	newline_needed ? "\n" : "");
	196	newline_needed = false;
bbbfd849 JG	197	goto skip_wait_rotation;
	198	}
	199	skip_wait_rotation:
58f237ca	200	MSG("%sSession %s destroyed", newline_needed ? "\n" : "",
bbbfd849	201	session->name);
58f237ca JG	202	newline_needed = false;
	203	if (stats_str) {
	204	MSG("%s", stats_str);
	205	}
1dac0189 PPM	206
	207	session_name = get_session_name_quiet();
	208	if (session_name && !strncmp(session->name, session_name, NAME_MAX)) {
	209	config_destroy_default();
	210	}
65f25c66 JRJ	211
	212	if (lttng_opt_mi) {
	213	ret = mi_lttng_session(writer, session, 0);
	214	if (ret) {
	215	ret = CMD_ERROR;
	216	goto error;
	217	}
	218	}
	219
f3ed775e	220	ret = CMD_SUCCESS;
b09ee5ba	221	error:
58f237ca	222	if (newline_needed) {
f16edb77 JG	223	MSG("");
f16edb77 JG	224	}
bbbfd849	225	lttng_destruction_handle_destroy(handle);
1dac0189	226	free(session_name);
58f237ca	227	free(stats_str);
b09ee5ba FG	228	return ret;
b09ee5ba FG	229	}
f3ed775e	230
b09ee5ba FG	231	/*
	232	* destroy_all_sessions
	233	*
	234	* Call destroy_sessions for each registered sessions
	235	*/
65f25c66	236	static int destroy_all_sessions(struct lttng_session *sessions, int count)
b09ee5ba	237	{
3285a971 JG	238	int i;
3285a971 JG	239	bool error_occurred = false;
b09ee5ba	240
3285a971	241	assert(count >= 0);
b09ee5ba FG	242	if (count == 0) {
	243	MSG("No session found, nothing to do.");
	244	}
60e835ca	245
b09ee5ba	246	for (i = 0; i < count; i++) {
3285a971 JG	247	int ret = destroy_session(&sessions[i]);
3285a971 JG	248
b09ee5ba	249	if (ret < 0) {
3285a971 JG	250	ERR("%s during the destruction of session \"%s\"",
	251	lttng_strerror(ret),
	252	sessions[i].name);
	253	/* Continue to next session. */
	254	error_occurred = true;
b09ee5ba	255	}
b73d0b29	256	}
3285a971 JG	257
3285a971 JG	258	return error_occurred ? CMD_ERROR : CMD_SUCCESS;
f3ed775e DG	259	}
	260
	261	/*
843f5df9	262	* The 'destroy <options>' first level command
f3ed775e DG	263	*/
	264	int cmd_destroy(int argc, const char **argv)
	265	{
b09ee5ba	266	int opt;
65f25c66	267	int ret = CMD_SUCCESS , i, command_ret = CMD_SUCCESS, success = 1;
f3ed775e	268	static poptContext pc;
b09ee5ba	269	char *session_name = NULL;
68c7f6e5	270	const char *leftover = NULL;
f3ed775e	271
65f25c66 JRJ	272	struct lttng_session *sessions;
	273	int count;
	274	int found;
	275
f3ed775e DG	276	pc = poptGetContext(NULL, argc, argv, long_options, 0);
	277	poptReadDefaultConfig(pc, 0);
	278
	279	while ((opt = poptGetNextOpt(pc)) != -1) {
	280	switch (opt) {
	281	case OPT_HELP:
4ba92f18	282	SHOW_HELP();
b09ee5ba	283	break;
679b4943 SM	284	case OPT_LIST_OPTIONS:
679b4943 SM	285	list_cmd_options(stdout, long_options);
b09ee5ba	286	break;
f3ed775e	287	default:
f3ed775e	288	ret = CMD_UNDEFINED;
b09ee5ba	289	break;
f3ed775e	290	}
b09ee5ba	291	goto end;
f3ed775e DG	292	}
f3ed775e DG	293
65f25c66	294	/* Mi preparation */
c7e35b03	295	if (lttng_opt_mi) {
65f25c66 JRJ	296	writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
	297	if (!writer) {
	298	ret = -LTTNG_ERR_NOMEM;
	299	goto end;
	300	}
	301
	302	/* Open command element */
	303	ret = mi_lttng_writer_command_open(writer,
	304	mi_lttng_element_command_destroy);
	305	if (ret) {
	306	ret = CMD_ERROR;
	307	goto end;
	308	}
	309
	310	/* Open output element */
	311	ret = mi_lttng_writer_open_element(writer,
	312	mi_lttng_element_command_output);
	313	if (ret) {
	314	ret = CMD_ERROR;
	315	goto end;
	316	}
	317
	318	/* For validation and semantic purpose we open a sessions element */
	319	ret = mi_lttng_sessions_open(writer);
	320	if (ret) {
	321	ret = CMD_ERROR;
	322	goto end;
	323	}
	324	}
	325
	326	/* Recuperate all sessions for further operation */
	327	count = lttng_list_sessions(&sessions);
	328	if (count < 0) {
56c3ec9e JR	329	ERR("%s", lttng_strerror(count));
56c3ec9e JR	330	command_ret = CMD_ERROR;
65f25c66 JRJ	331	success = 0;
65f25c66 JRJ	332	goto mi_closing;
c7e35b03 JR	333	}
c7e35b03 JR	334
fd076c09	335	/* Ignore session name in case all sessions are to be destroyed */
b09ee5ba	336	if (opt_destroy_all) {
65f25c66 JRJ	337	command_ret = destroy_all_sessions(sessions, count);
	338	if (command_ret) {
	339	success = 0;
	340	}
	341	} else {
	342	opt_session_name = (char *) poptGetArg(pc);
	343
1dac0189	344	if (!opt_session_name) {
65f25c66 JRJ	345	/* No session name specified, lookup default */
	346	session_name = get_session_name();
	347	if (session_name == NULL) {
	348	command_ret = CMD_ERROR;
	349	success = 0;
	350	goto mi_closing;
	351	}
	352	} else {
	353	session_name = opt_session_name;
	354	}
fd076c09	355
65f25c66 JRJ	356	/* Find the corresponding lttng_session struct */
	357	found = 0;
	358	for (i = 0; i < count; i++) {
	359	if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
	360	found = 1;
	361	command_ret = destroy_session(&sessions[i]);
	362	if (command_ret) {
	363	success = 0;
3285a971 JG	364	ERR("%s during the destruction of session \"%s\"",
	365	lttng_strerror(command_ret),
	366	sessions[i].name);
65f25c66	367	}
65f25c66 JRJ	368	}
	369	}
	370
	371	if (!found) {
	372	ERR("Session name %s not found", session_name);
	373	command_ret = LTTNG_ERR_SESS_NOT_FOUND;
	374	success = 0;
	375	goto mi_closing;
	376	}
	377	}
	378
68c7f6e5 JD	379	leftover = poptGetArg(pc);
	380	if (leftover) {
	381	ERR("Unknown argument: %s", leftover);
	382	ret = CMD_ERROR;
	383	success = 0;
	384	goto mi_closing;
	385	}
	386
65f25c66 JRJ	387	mi_closing:
	388	/* Mi closing */
	389	if (lttng_opt_mi) {
	390	/* Close sessions and output element element */
	391	ret = mi_lttng_close_multi_element(writer, 2);
	392	if (ret) {
fd076c09	393	ret = CMD_ERROR;
b09ee5ba FG	394	goto end;
b09ee5ba FG	395	}
fd076c09	396
65f25c66 JRJ	397	/* Success ? */
	398	ret = mi_lttng_writer_write_element_bool(writer,
	399	mi_lttng_element_command_success, success);
	400	if (ret) {
	401	ret = CMD_ERROR;
	402	goto end;
	403	}
f3ed775e	404
65f25c66 JRJ	405	/* Command element close */
	406	ret = mi_lttng_writer_command_close(writer);
	407	if (ret) {
	408	ret = CMD_ERROR;
	409	goto end;
	410	}
	411	}
f3ed775e	412	end:
65f25c66 JRJ	413	/* Mi clean-up */
	414	if (writer && mi_lttng_writer_destroy(writer)) {
	415	/* Preserve original error code */
	416	ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
	417	}
	418
fd076c09	419	if (opt_session_name == NULL) {
b09ee5ba FG	420	free(session_name);
b09ee5ba FG	421	}
fd076c09	422
65f25c66 JRJ	423	/* Overwrite ret if an error occurred during destroy_session/all */
	424	ret = command_ret ? command_ret : ret;
	425
fd076c09	426	poptFreeContext(pc);
f3ed775e DG	427	return ret;
f3ed775e DG	428	}