[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 "../command.hpp"

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

#include <lttng/lttng.h>

#include <popt.h>
#include <stdbool.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

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, nullptr, OPT_HELP, nullptr, nullptr },
	{ "all", 'a', POPT_ARG_VAL, &opt_destroy_all, 1, nullptr, nullptr },
	{ "list-options", 0, POPT_ARG_NONE, nullptr, OPT_LIST_OPTIONS, nullptr, nullptr },
	{ "no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, nullptr, nullptr },
	{ nullptr, 0, 0, nullptr, 0, nullptr, nullptr }
};

/*
 * 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 = nullptr;
	bool session_was_already_stopped;
	enum lttng_error_code ret_code;
	struct lttng_destruction_handle *handle = nullptr;
	enum lttng_destruction_handle_status status;
	bool newline_needed = false, printed_destroy_msg = false;
	enum lttng_rotation_state rotation_state;
	char *stats_str = nullptr;

	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 = nullptr;
	const char *arg_session_name = nullptr;
	const char *leftover = nullptr;

	struct lttng_session *sessions = nullptr;
	int count;
	int found;

	pc = poptGetContext(nullptr, 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 == nullptr) {
				PERROR("Failed to copy session name");
			}
		}

		if (session_name == nullptr) {
			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
28ab034a JG	9	#include "../command.hpp"
	10
	11	#include <common/mi-lttng.hpp>
	12	#include <common/sessiond-comm/sessiond-comm.hpp>
	13	#include <common/utils.hpp>
	14
	15	#include <lttng/lttng.h>
	16
f3ed775e	17	#include <popt.h>
28ab034a	18	#include <stdbool.h>
f3ed775e DG	19	#include <stdio.h>
	20	#include <stdlib.h>
	21	#include <string.h>
	22	#include <sys/stat.h>
	23	#include <sys/types.h>
	24	#include <unistd.h>
42224349	25
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>
28ab034a	32	;
4fc83d94 PP	33	#endif
4fc83d94 PP	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 */
cd9adb8b JG	45	{ "help", 'h', POPT_ARG_NONE, nullptr, OPT_HELP, nullptr, nullptr },
	46	{ "all", 'a', POPT_ARG_VAL, &opt_destroy_all, 1, nullptr, nullptr },
	47	{ "list-options", 0, POPT_ARG_NONE, nullptr, OPT_LIST_OPTIONS, nullptr, nullptr },
	48	{ "no-wait", 'n', POPT_ARG_VAL, &opt_no_wait, 1, nullptr, nullptr },
	49	{ nullptr, 0, 0, nullptr, 0, nullptr, nullptr }
f3ed775e DG	50	};
f3ed775e DG	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;
cd9adb8b	61	char *session_name = nullptr;
58f237ca	62	bool session_was_already_stopped;
bbbfd849	63	enum lttng_error_code ret_code;
cd9adb8b	64	struct lttng_destruction_handle *handle = nullptr;
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;
cd9adb8b	68	char *stats_str = nullptr;
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) {
dec2c8e1	90	if (!printed_destroy_msg) {
28ab034a	91	_MSG("Destroying session %s", session->name);
dec2c8e1 JG	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	126	status = lttng_destruction_handle_wait_for_completion(
28ab034a	127	handle, DEFAULT_DATA_AVAILABILITY_WAIT_TIME_US / USEC_PER_MSEC);
bbbfd849 JG	128	switch (status) {
bbbfd849 JG	129	case LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT:
58f237ca JG	130	if (!printed_destroy_msg) {
	131	_MSG("Destroying session %s", session->name);
	132	newline_needed = true;
	133	printed_destroy_msg = true;
bbbfd849 JG	134	}
	135	_MSG(".");
	136	fflush(stdout);
	137	break;
	138	case LTTNG_DESTRUCTION_HANDLE_STATUS_COMPLETED:
	139	break;
	140	default:
58f237ca	141	ERR("%sFailed to wait for the completion of the destruction of session \"%s\"",
28ab034a JG	142	newline_needed ? "\n" : "",
28ab034a JG	143	session->name);
58f237ca	144	newline_needed = false;
bbbfd849 JG	145	ret = -1;
	146	goto error;
	147	}
	148	} while (status == LTTNG_DESTRUCTION_HANDLE_STATUS_TIMEOUT);
	149
	150	status = lttng_destruction_handle_get_result(handle, &ret_code);
	151	if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
58f237ca	152	ERR("%sFailed to get the result of session destruction",
28ab034a	153	newline_needed ? "\n" : "");
bbbfd849	154	ret = -1;
58f237ca	155	newline_needed = false;
bbbfd849 JG	156	goto error;
	157	}
	158	if (ret_code != LTTNG_OK) {
3285a971	159	ret = -ret_code;
bbbfd849 JG	160	goto error;
	161	}
	162
28ab034a	163	status = lttng_destruction_handle_get_rotation_state(handle, &rotation_state);
7d81aa9f	164	if (status != LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
58f237ca	165	ERR("%sFailed to get rotation state from destruction handle",
28ab034a	166	newline_needed ? "\n" : "");
58f237ca	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
28ab034a	178	status = lttng_destruction_handle_get_archive_location(handle, &location);
bbbfd849	179	if (status == LTTNG_DESTRUCTION_HANDLE_STATUS_OK) {
28ab034a	180	ret = print_trace_archive_location(location, session->name);
bbbfd849	181	if (ret) {
58f237ca	182	ERR("%sFailed to print the location of trace archive",
28ab034a	183	newline_needed ? "\n" : "");
58f237ca	184	newline_needed = false;
bbbfd849 JG	185	goto skip_wait_rotation;
	186	}
	187	break;
	188	}
58f237ca	189	}
30eb3927	190	/* fall-through. */
58f237ca JG	191	default:
58f237ca JG	192	ERR("%sFailed to get the location of the rotation performed during the session's destruction",
28ab034a	193	newline_needed ? "\n" : "");
58f237ca	194	newline_needed = false;
bbbfd849 JG	195	goto skip_wait_rotation;
	196	}
	197	skip_wait_rotation:
28ab034a	198	MSG("%sSession %s destroyed", newline_needed ? "\n" : "", session->name);
58f237ca JG	199	newline_needed = false;
	200	if (stats_str) {
	201	MSG("%s", stats_str);
	202	}
1dac0189 PPM	203
	204	session_name = get_session_name_quiet();
	205	if (session_name && !strncmp(session->name, session_name, NAME_MAX)) {
	206	config_destroy_default();
	207	}
65f25c66 JRJ	208
	209	if (lttng_opt_mi) {
	210	ret = mi_lttng_session(writer, session, 0);
	211	if (ret) {
	212	ret = CMD_ERROR;
	213	goto error;
	214	}
	215	}
	216
f3ed775e	217	ret = CMD_SUCCESS;
b09ee5ba	218	error:
58f237ca	219	if (newline_needed) {
f16edb77 JG	220	MSG("");
f16edb77 JG	221	}
bbbfd849	222	lttng_destruction_handle_destroy(handle);
1dac0189	223	free(session_name);
58f237ca	224	free(stats_str);
b09ee5ba FG	225	return ret;
b09ee5ba FG	226	}
f3ed775e	227
b09ee5ba FG	228	/*
	229	* destroy_all_sessions
	230	*
	231	* Call destroy_sessions for each registered sessions
	232	*/
65f25c66	233	static int destroy_all_sessions(struct lttng_session *sessions, int count)
b09ee5ba	234	{
3285a971 JG	235	int i;
3285a971 JG	236	bool error_occurred = false;
b09ee5ba	237
a0377dfe	238	LTTNG_ASSERT(count >= 0);
b09ee5ba FG	239	if (count == 0) {
	240	MSG("No session found, nothing to do.");
	241	}
60e835ca	242
b09ee5ba	243	for (i = 0; i < count; i++) {
3285a971 JG	244	int ret = destroy_session(&sessions[i]);
3285a971 JG	245
b09ee5ba	246	if (ret < 0) {
3285a971	247	ERR("%s during the destruction of session \"%s\"",
28ab034a JG	248	lttng_strerror(ret),
28ab034a JG	249	sessions[i].name);
3285a971 JG	250	/* Continue to next session. */
3285a971 JG	251	error_occurred = true;
b09ee5ba	252	}
b73d0b29	253	}
3285a971 JG	254
3285a971 JG	255	return error_occurred ? CMD_ERROR : CMD_SUCCESS;
f3ed775e DG	256	}
	257
	258	/*
843f5df9	259	* The 'destroy <options>' first level command
f3ed775e DG	260	*/
	261	int cmd_destroy(int argc, const char **argv)
	262	{
b09ee5ba	263	int opt;
28ab034a	264	int ret = CMD_SUCCESS, i, command_ret = CMD_SUCCESS, success = 1;
f3ed775e	265	static poptContext pc;
cd9adb8b JG	266	char *session_name = nullptr;
	267	const char *arg_session_name = nullptr;
	268	const char *leftover = nullptr;
f3ed775e	269
cd9adb8b	270	struct lttng_session *sessions = nullptr;
65f25c66 JRJ	271	int count;
	272	int found;
	273
cd9adb8b	274	pc = poptGetContext(nullptr, argc, argv, long_options, 0);
f3ed775e DG	275	poptReadDefaultConfig(pc, 0);
	276
	277	while ((opt = poptGetNextOpt(pc)) != -1) {
	278	switch (opt) {
	279	case OPT_HELP:
4ba92f18	280	SHOW_HELP();
b09ee5ba	281	break;
679b4943 SM	282	case OPT_LIST_OPTIONS:
679b4943 SM	283	list_cmd_options(stdout, long_options);
b09ee5ba	284	break;
f3ed775e	285	default:
f3ed775e	286	ret = CMD_UNDEFINED;
b09ee5ba	287	break;
f3ed775e	288	}
b09ee5ba	289	goto end;
f3ed775e DG	290	}
f3ed775e DG	291
65f25c66	292	/* Mi preparation */
c7e35b03	293	if (lttng_opt_mi) {
65f25c66 JRJ	294	writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
	295	if (!writer) {
	296	ret = -LTTNG_ERR_NOMEM;
	297	goto end;
	298	}
	299
	300	/* Open command element */
28ab034a	301	ret = mi_lttng_writer_command_open(writer, mi_lttng_element_command_destroy);
65f25c66 JRJ	302	if (ret) {
	303	ret = CMD_ERROR;
	304	goto end;
	305	}
	306
	307	/* Open output element */
28ab034a	308	ret = mi_lttng_writer_open_element(writer, mi_lttng_element_command_output);
65f25c66 JRJ	309	if (ret) {
	310	ret = CMD_ERROR;
	311	goto end;
	312	}
	313
	314	/* For validation and semantic purpose we open a sessions element */
	315	ret = mi_lttng_sessions_open(writer);
	316	if (ret) {
	317	ret = CMD_ERROR;
	318	goto end;
	319	}
	320	}
	321
	322	/* Recuperate all sessions for further operation */
	323	count = lttng_list_sessions(&sessions);
	324	if (count < 0) {
56c3ec9e JR	325	ERR("%s", lttng_strerror(count));
56c3ec9e JR	326	command_ret = CMD_ERROR;
65f25c66 JRJ	327	success = 0;
65f25c66 JRJ	328	goto mi_closing;
c7e35b03 JR	329	}
c7e35b03 JR	330
fd076c09	331	/* Ignore session name in case all sessions are to be destroyed */
b09ee5ba	332	if (opt_destroy_all) {
65f25c66 JRJ	333	command_ret = destroy_all_sessions(sessions, count);
	334	if (command_ret) {
	335	success = 0;
	336	}
	337	} else {
5b915816	338	arg_session_name = poptGetArg(pc);
65f25c66	339
5b915816	340	if (!arg_session_name) {
65f25c66 JRJ	341	/* No session name specified, lookup default */
65f25c66 JRJ	342	session_name = get_session_name();
5b915816 MJ	343	} else {
5b915816 MJ	344	session_name = strdup(arg_session_name);
cd9adb8b	345	if (session_name == nullptr) {
5b915816	346	PERROR("Failed to copy session name");
65f25c66	347	}
5b915816 MJ	348	}
5b915816 MJ	349
cd9adb8b	350	if (session_name == nullptr) {
5b915816 MJ	351	command_ret = CMD_ERROR;
	352	success = 0;
	353	goto mi_closing;
65f25c66	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	364	ERR("%s during the destruction of session \"%s\"",
28ab034a JG	365	lttng_strerror(command_ret),
28ab034a JG	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	397	/* Success ? */
28ab034a JG	398	ret = mi_lttng_writer_write_element_bool(
28ab034a JG	399	writer, mi_lttng_element_command_success, success);
65f25c66 JRJ	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
5b915816	419	free(session_name);
6a8d2abc SM	420	free(sessions);
6a8d2abc SM	421
65f25c66 JRJ	422	/* Overwrite ret if an error occurred during destroy_session/all */
	423	ret = command_ret ? command_ret : ret;
	424
fd076c09	425	poptFreeContext(pc);
f3ed775e DG	426	return ret;
f3ed775e DG	427	}