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

/*
 * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
 *
 * 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 _GNU_SOURCE
#include <assert.h>
#include <inttypes.h>
#include <popt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>
#include <assert.h>

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

#include "../command.h"

static const char *opt_session_name;
static const char *opt_output_name;
static const char *opt_data_url;
static const char *opt_ctrl_url;
static const char *current_session_name;
static uint64_t opt_max_size;

/* Stub for the cmd struct actions. */
static int cmd_add_output(int argc, const char **argv);
static int cmd_del_output(int argc, const char **argv);
static int cmd_list_output(int argc, const char **argv);
static int cmd_record(int argc, const char **argv);

static const char *indent4 = "    ";

enum {
	OPT_HELP = 1,
	OPT_LIST_OPTIONS,
	OPT_MAX_SIZE,
	OPT_LIST_COMMANDS,
};

static struct mi_writer *writer;

static struct poptOption snapshot_opts[] = {
	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	{"help",      'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
	{"session",      's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
	{"ctrl-url",     'C', POPT_ARG_STRING, &opt_ctrl_url, 0, 0, 0},
	{"data-url",     'D', POPT_ARG_STRING, &opt_data_url, 0, 0, 0},
	{"name",         'n', POPT_ARG_STRING, &opt_output_name, 0, 0, 0},
	{"max-size",     'm', POPT_ARG_STRING, 0, OPT_MAX_SIZE, 0, 0},
	{"list-options",   0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
	{"list-commands",  0, POPT_ARG_NONE, NULL, OPT_LIST_COMMANDS},
	{0, 0, 0, 0, 0, 0, 0}
};

static struct cmd_struct actions[] = {
	{ "add-output", cmd_add_output },
	{ "del-output", cmd_del_output },
	{ "list-output", cmd_list_output },
	{ "record", cmd_record },
	{ NULL, NULL }	/* Array closure */
};

/*
 * usage
 */
static void usage(FILE *ofp)
{
	fprintf(ofp, "usage: lttng snapshot [OPTION] ACTION\n");
	fprintf(ofp, "\n");
	fprintf(ofp, "Actions:\n");
	fprintf(ofp, "   add-output [-m <SIZE>] [-s <NAME>] [-n <NAME>] <URL> | -C <URL> -D <URL>\n");
	fprintf(ofp, "      Setup and add an snapshot output for a session.\n");
	fprintf(ofp, "\n");
	fprintf(ofp, "   del-output ID | NAME [-s <NAME>]\n");
	fprintf(ofp, "      Delete an output for a session using the ID.\n");
	fprintf(ofp, "\n");
	fprintf(ofp, "   list-output [-s <NAME>]\n");
	fprintf(ofp, "      List the output of a session.\n");
	fprintf(ofp, "\n");
	fprintf(ofp, "   record [-m <SIZE>] [-s <NAME>] [-n <NAME>] [<URL> | -C <URL> -D <URL>]\n");
	fprintf(ofp, "      Snapshot a session's buffer(s) for all domains. If an URL is\n");
	fprintf(ofp, "      specified, it is used instead of a previously added output.\n");
	fprintf(ofp, "      Specifying only a name or/a size will override the current output value.\n");
	fprintf(ofp, "      For instance, you can record a snapshot with a custom maximum size\n");
	fprintf(ofp, "      or with a different name.\n");
	fprintf(ofp, "\n");
	fprintf(ofp, "Options:\n");
	fprintf(ofp, "  -h, --help           Show this help\n");
	fprintf(ofp, "      --list-options   Simple listing of options\n");
	fprintf(ofp, "  -s, --session NAME   Apply to session name\n");
	fprintf(ofp, "  -n, --name NAME      Name of the output or snapshot\n");
	fprintf(ofp, "  -m, --max-size SIZE  Maximum bytes size of the snapshot {+k,+M,+G}\n");
	fprintf(ofp, "  -C, --ctrl-url URL   Set control path URL. (Must use -D also)\n");
	fprintf(ofp, "  -D, --data-url URL   Set data path URL. (Must use -C also)\n");
	fprintf(ofp, "\n");
}

/*
 * Count and return the number of arguments in argv.
 */
static int count_arguments(const char **argv)
{
	int i = 0;

	assert(argv);

	while (argv[i] != NULL) {
		i++;
	}

	return i;
}

/*
 * Create a snapshot output object from arguments using the given URL.
 *
 * Return a newly allocated object or NULL on error.
 */
static struct lttng_snapshot_output *create_output_from_args(const char *url)
{
	int ret = 0;
	struct lttng_snapshot_output *output = NULL;

	output = lttng_snapshot_output_create();
	if (!output) {
		goto error_create;
	}

	if (url) {
		ret = lttng_snapshot_output_set_ctrl_url(url, output);
		if (ret < 0) {
			goto error;
		}
	} else if (opt_ctrl_url) {
		ret = lttng_snapshot_output_set_ctrl_url(opt_ctrl_url, output);
		if (ret < 0) {
			goto error;
		}
	}

	if (opt_data_url) {
		ret = lttng_snapshot_output_set_data_url(opt_data_url, output);
		if (ret < 0) {
			goto error;
		}
	}

	if (opt_max_size) {
		ret = lttng_snapshot_output_set_size(opt_max_size, output);
		if (ret < 0) {
			goto error;
		}
	}

	if (opt_output_name) {
		ret = lttng_snapshot_output_set_name(opt_output_name, output);
		if (ret < 0) {
			goto error;
		}
	}

	return output;

error:
	lttng_snapshot_output_destroy(output);
error_create:
	return NULL;
}

static int mi_list_output(void)
{
	int ret;
	struct lttng_snapshot_output *s_iter;
	struct lttng_snapshot_output_list *list;

	assert(writer);

	ret = lttng_snapshot_list_output(current_session_name, &list);
	if (ret < 0) {
		goto error;
	}

	ret = mi_lttng_snapshot_output_session_name(writer, current_session_name);
	if (ret) {
		ret = CMD_ERROR;
		goto end;
	}

	while ((s_iter = lttng_snapshot_output_list_get_next(list)) != NULL) {
		ret = mi_lttng_snapshot_list_output(writer, s_iter);
		if (ret) {
			ret = CMD_ERROR;
			goto end;
		}
	}


	/* Close snapshot snapshots element */
	ret = mi_lttng_writer_close_element(writer);
	if (ret) {
		ret = CMD_ERROR;
		goto end;
	}

	/* Close snapshot session element */
	ret = mi_lttng_writer_close_element(writer);
	if (ret) {
		ret = CMD_ERROR;
	}
end:
	lttng_snapshot_output_list_destroy(list);
error:
	return ret;
}

static int list_output(void)
{
	int ret, output_seen = 0;
	struct lttng_snapshot_output *s_iter;
	struct lttng_snapshot_output_list *list;

	ret = lttng_snapshot_list_output(current_session_name, &list);
	if (ret < 0) {
		goto error;
	}

	MSG("Snapshot output list for session %s", current_session_name);

	while ((s_iter = lttng_snapshot_output_list_get_next(list)) != NULL) {
		MSG("%s[%" PRIu32 "] %s: %s (max-size: %" PRId64 ")", indent4,
				lttng_snapshot_output_get_id(s_iter),
				lttng_snapshot_output_get_name(s_iter),
				lttng_snapshot_output_get_ctrl_url(s_iter),
				lttng_snapshot_output_get_maxsize(s_iter));
		output_seen = 1;
	}

	lttng_snapshot_output_list_destroy(list);

	if (!output_seen) {
		MSG("%sNone", indent4);
	}

error:
	return ret;
}

/*
 * Delete output by ID (machine interface version).
 */
static int mi_del_output(uint32_t id, const char *name)
{
	int ret;
	struct lttng_snapshot_output *output = NULL;

	assert(writer);

	output = lttng_snapshot_output_create();
	if (!output) {
		ret = CMD_FATAL;
		goto error;
	}

	if (name) {
		ret = lttng_snapshot_output_set_name(name, output);
	} else if (id != UINT32_MAX) {
		ret = lttng_snapshot_output_set_id(id, output);
	} else {
		ret = CMD_ERROR;
		goto error;
	}
	if (ret < 0) {
		ret = CMD_FATAL;
		goto error;
	}

	ret = lttng_snapshot_del_output(current_session_name, output);
	if (ret < 0) {
		ret = CMD_FATAL;
		goto error;
	}

	ret = mi_lttng_snapshot_del_output(writer, id, name, current_session_name);
	if (ret) {
		ret = CMD_ERROR;
	}

error:
	lttng_snapshot_output_destroy(output);
	return ret;
}

/*
 * Delete output by ID.
 */
static int del_output(uint32_t id, const char *name)
{
	int ret;
	struct lttng_snapshot_output *output = NULL;

	output = lttng_snapshot_output_create();
	if (!output) {
		ret = CMD_FATAL;
		goto error;
	}

	if (name) {
		ret = lttng_snapshot_output_set_name(name, output);
	} else if (id != UINT32_MAX) {
		ret = lttng_snapshot_output_set_id(id, output);
	} else {
		ret = CMD_ERROR;
		goto error;
	}
	if (ret < 0) {
		ret = CMD_FATAL;
		goto error;
	}

	ret = lttng_snapshot_del_output(current_session_name, output);
	if (ret < 0) {
		goto error;
	}

	if (id != UINT32_MAX) {
		MSG("Snapshot output id %" PRIu32 " successfully deleted for session %s",
				id, current_session_name);
	} else {
		MSG("Snapshot output %s successfully deleted for session %s",
				name, current_session_name);
	}

error:
	lttng_snapshot_output_destroy(output);
	return ret;
}

/*
 * Add output from the user URL (machine interface).
 */
static int mi_add_output(const char *url)
{
	int ret;
	struct lttng_snapshot_output *output = NULL;
	char name[NAME_MAX];
	const char *n_ptr;

	if (!url && (!opt_data_url || !opt_ctrl_url)) {
		ret = CMD_ERROR;
		goto error;
	}

	output = create_output_from_args(url);
	if (!output) {
		ret = CMD_FATAL;
		goto error;
	}

	/* This call, if successful, populates the id of the output object. */
	ret = lttng_snapshot_add_output(current_session_name, output);
	if (ret < 0) {
		ret = CMD_ERROR;
		goto error;
	}

	n_ptr = lttng_snapshot_output_get_name(output);
	if (*n_ptr == '\0') {
		int pret;
		pret = snprintf(name, sizeof(name), DEFAULT_SNAPSHOT_NAME "-%" PRIu32,
				lttng_snapshot_output_get_id(output));
		if (pret < 0) {
			PERROR("snprintf add output name");
		}
		n_ptr = name;
	}

	ret = mi_lttng_snapshot_add_output(writer, current_session_name, n_ptr,
			output);
	if (ret) {
		ret = CMD_ERROR;
	}

error:
	lttng_snapshot_output_destroy(output);
	return ret;
}

/*
 * Add output from the user URL.
 */
static int add_output(const char *url)
{
	int ret;
	struct lttng_snapshot_output *output = NULL;
	char name[NAME_MAX];
	const char *n_ptr;

	if (!url && (!opt_data_url || !opt_ctrl_url)) {
		ret = CMD_ERROR;
		goto error;
	}

	output = create_output_from_args(url);
	if (!output) {
		ret = CMD_FATAL;
		goto error;
	}

	/* This call, if successful, populates the id of the output object. */
	ret = lttng_snapshot_add_output(current_session_name, output);
	if (ret < 0) {
		goto error;
	}

	n_ptr = lttng_snapshot_output_get_name(output);
	if (*n_ptr == '\0') {
		int pret;
		pret = snprintf(name, sizeof(name), DEFAULT_SNAPSHOT_NAME "-%" PRIu32,
				lttng_snapshot_output_get_id(output));
		if (pret < 0) {
			PERROR("snprintf add output name");
		}
		n_ptr = name;
	}

	MSG("Snapshot output successfully added for session %s",
			current_session_name);
	MSG("  [%" PRIu32 "] %s: %s (max-size: %" PRId64 ")",
			lttng_snapshot_output_get_id(output), n_ptr,
			lttng_snapshot_output_get_ctrl_url(output),
			lttng_snapshot_output_get_maxsize(output));
error:
	lttng_snapshot_output_destroy(output);
	return ret;
}

static int cmd_add_output(int argc, const char **argv)
{
	int ret;

	if (argc < 2 && (!opt_data_url || !opt_ctrl_url)) {
		usage(stderr);
		ret = CMD_ERROR;
		goto end;
	}

	if (lttng_opt_mi) {
		ret = mi_add_output(argv[1]);
	} else {
		ret = add_output(argv[1]);
	}

end:
	return ret;
}

static int cmd_del_output(int argc, const char **argv)
{
	int ret;
	char *name;
	long id;

	if (argc < 2) {
		usage(stderr);
		ret = CMD_ERROR;
		goto end;
	}

	errno = 0;
	id = strtol(argv[1], &name, 10);
	if (id == 0 && errno == 0) {
		if (lttng_opt_mi) {
			ret = mi_del_output(UINT32_MAX, name);
		} else {
			ret = del_output(UINT32_MAX, name);
		}
	} else if (errno == 0 && *name == '\0') {
		if (lttng_opt_mi) {
			ret = mi_del_output(id, NULL);
		} else {
			ret = del_output(id, NULL);
		}
	} else {
		ERR("Argument %s not recognized", argv[1]);
		ret = -1;
		goto end;
	}

end:
	return ret;
}

static int cmd_list_output(int argc, const char **argv)
{
	int ret;

	if (lttng_opt_mi) {
		ret = mi_list_output();
	} else {
		ret = list_output();
	}

	return ret;
}

/*
 * Do a snapshot record with the URL if one is given (machine interface).
 */
static int mi_record(const char *url)
{
	int ret;
	struct lttng_snapshot_output *output = NULL;

	output = create_output_from_args(url);
	if (!output) {
		ret = CMD_FATAL;
		goto error;
	}

	ret = lttng_snapshot_record(current_session_name, output, 0);
	if (ret < 0) {
		ret = CMD_ERROR;
		goto error;
	}

	ret = mi_lttng_snapshot_record(writer, current_session_name, url,
			opt_ctrl_url, opt_data_url);
	if (ret) {
		ret = CMD_ERROR;
	}

error:
	lttng_snapshot_output_destroy(output);
	return ret;
}

/*
 * Do a snapshot record with the URL if one is given.
 */
static int record(const char *url)
{
	int ret;
	struct lttng_snapshot_output *output = NULL;

	output = create_output_from_args(url);
	if (!output) {
		ret = CMD_FATAL;
		goto error;
	}

	ret = lttng_snapshot_record(current_session_name, output, 0);
	if (ret < 0) {
		if (ret == -LTTNG_ERR_MAX_SIZE_INVALID) {
			ERR("The minimum size of a snapshot is computed by multiplying "
					"the total amount of streams with the largest subbuffer "
					"in the session.");
		}
		goto error;
	}

	MSG("Snapshot recorded successfully for session %s", current_session_name);

	if (url) {
		MSG("Snapshot written at: %s", url);
	} else if (opt_ctrl_url) {
		MSG("Snapshot written to ctrl: %s, data: %s", opt_ctrl_url,
				opt_data_url);
	}

error:
	lttng_snapshot_output_destroy(output);
	return ret;
}

static int cmd_record(int argc, const char **argv)
{
	int ret;

	if (argc == 2) {
		/* With a given URL */
		if (lttng_opt_mi) {
			ret = mi_record(argv[1]);
		} else {
			ret = record(argv[1]);
		}
	} else {
		if (lttng_opt_mi) {
			ret = mi_record(NULL);
		} else {
			ret = record(NULL);
		}
	}

	return ret;
}

static int handle_command(const char **argv)
{
	int ret = CMD_SUCCESS, i = 0, argc, command_ret =  CMD_SUCCESS;
	struct cmd_struct *cmd;

	if (argv == NULL || (!opt_ctrl_url && opt_data_url) ||
			(opt_ctrl_url && !opt_data_url)) {
		usage(stderr);
		command_ret = CMD_ERROR;
		goto end;
	}

	argc = count_arguments(argv);

	cmd = &actions[i];
	while (cmd->func != NULL) {
		/* Find command */
		if (strcmp(argv[0], cmd->name) == 0) {
			if (lttng_opt_mi) {
				/* Action element */
				ret = mi_lttng_writer_open_element(writer,
						mi_lttng_element_command_action);
				if (ret) {
					ret = CMD_ERROR;
					goto end;
				}

				/* Name of the action */
				ret = mi_lttng_writer_write_element_string(writer,
						config_element_name, argv[0]);
				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;
				}
			}

			command_ret = cmd->func(argc, argv);

			if (lttng_opt_mi) {
				/* Close output and action element */
				ret = mi_lttng_close_multi_element(writer, 2);
				if (ret) {
					ret = CMD_ERROR;
					goto end;
				}
			}
			goto end;
		}
		i++;
		cmd = &actions[i];
	}

	ret = -CMD_UNDEFINED;

end:
	/* Overwrite ret if an error occured in cmd->func() */
	ret = command_ret ? command_ret : ret;
	return ret;
}
/*
 * The 'snapshot <cmd> <options>' first level command
 */
int cmd_snapshot(int argc, const char **argv)
{
	int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
	char *session_name = NULL;
	static poptContext pc;

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

	/* Mi check */
	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_snapshot);
		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;
		}
	}

	while ((opt = poptGetNextOpt(pc)) != -1) {
		switch (opt) {
		case OPT_HELP:
			usage(stdout);
			goto end;
		case OPT_LIST_OPTIONS:
			list_cmd_options(stdout, snapshot_opts);
			goto end;
		case OPT_LIST_COMMANDS:
			list_commands(actions, stdout);
			goto end;
		case OPT_MAX_SIZE:
		{
			uint64_t val;
			const char *opt = poptGetOptArg(pc);

			if (utils_parse_size_suffix((char *) opt, &val) < 0) {
				ERR("Unable to handle max-size value %s", opt);
				ret = CMD_ERROR;
				goto end;
			}

			opt_max_size = val;

			break;
		}
		default:
			usage(stderr);
			ret = CMD_UNDEFINED;
			goto end;
		}
	}

	if (!opt_session_name) {
		session_name = get_session_name();
		if (session_name == NULL) {
			ret = CMD_ERROR;
			goto end;
		}
		current_session_name = session_name;
	} else {
		current_session_name = opt_session_name;
	}

	command_ret = handle_command(poptGetArgs(pc));
	if (command_ret < 0) {
		switch (-command_ret) {
		case LTTNG_ERR_EPERM:
			ERR("The session needs to be set in no output mode (--no-output)");
			break;
		case LTTNG_ERR_SNAPSHOT_NODATA:
			WARN("%s", lttng_strerror(command_ret));
			break;
		default:
			ERR("%s", lttng_strerror(command_ret));
			break;
		}
		success = 0;
	}

	if (lttng_opt_mi) {
		/* Close output element */
		ret = mi_lttng_writer_close_element(writer);
		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) {
		free(session_name);
	}

	/* Overwrite ret if an error occured during handle_command */
	ret = command_ret ? command_ret : ret;
	poptFreeContext(pc);
	return ret;
}
Commit	Line	Data
57f272ed DG	1	/*
	2	* Copyright (C) 2013 - David Goulet <dgoulet@efficios.com>
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU General Public License, version 2 only, as
	6	* published by the Free Software Foundation.
	7	*
	8	* This program is distributed in the hope that it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc., 51
	15	* Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	16	*/
	17
	18	#define _GNU_SOURCE
	19	#include <assert.h>
	20	#include <inttypes.h>
	21	#include <popt.h>
	22	#include <stdio.h>
	23	#include <stdlib.h>
	24	#include <string.h>
	25	#include <sys/stat.h>
	26	#include <sys/types.h>
	27	#include <unistd.h>
50534d6f	28	#include <assert.h>
57f272ed	29
a8f307d8	30	#include <common/utils.h>
50534d6f	31	#include <common/mi-lttng.h>
57f272ed DG	32	#include <lttng/snapshot.h>
	33
	34	#include "../command.h"
	35
	36	static const char *opt_session_name;
	37	static const char *opt_output_name;
	38	static const char *opt_data_url;
	39	static const char *opt_ctrl_url;
	40	static const char *current_session_name;
	41	static uint64_t opt_max_size;
	42
	43	/* Stub for the cmd struct actions. */
	44	static int cmd_add_output(int argc, const char **argv);
	45	static int cmd_del_output(int argc, const char **argv);
	46	static int cmd_list_output(int argc, const char **argv);
	47	static int cmd_record(int argc, const char **argv);
	48
	49	static const char *indent4 = " ";
	50
	51	enum {
	52	OPT_HELP = 1,
	53	OPT_LIST_OPTIONS,
	54	OPT_MAX_SIZE,
3c9bd23c	55	OPT_LIST_COMMANDS,
57f272ed DG	56	};
57f272ed DG	57
50534d6f JRJ	58	static struct mi_writer *writer;
50534d6f JRJ	59
57f272ed DG	60	static struct poptOption snapshot_opts[] = {
	61	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	62	{"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
	63	{"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
	64	{"ctrl-url", 'C', POPT_ARG_STRING, &opt_ctrl_url, 0, 0, 0},
	65	{"data-url", 'D', POPT_ARG_STRING, &opt_data_url, 0, 0, 0},
	66	{"name", 'n', POPT_ARG_STRING, &opt_output_name, 0, 0, 0},
a8f307d8	67	{"max-size", 'm', POPT_ARG_STRING, 0, OPT_MAX_SIZE, 0, 0},
57f272ed	68	{"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
3c9bd23c	69	{"list-commands", 0, POPT_ARG_NONE, NULL, OPT_LIST_COMMANDS},
57f272ed DG	70	{0, 0, 0, 0, 0, 0, 0}
	71	};
	72
	73	static struct cmd_struct actions[] = {
	74	{ "add-output", cmd_add_output },
	75	{ "del-output", cmd_del_output },
	76	{ "list-output", cmd_list_output },
	77	{ "record", cmd_record },
	78	{ NULL, NULL } /* Array closure */
	79	};
	80
	81	/*
	82	* usage
	83	*/
	84	static void usage(FILE *ofp)
	85	{
8df3bfe9	86	fprintf(ofp, "usage: lttng snapshot [OPTION] ACTION\n");
57f272ed DG	87	fprintf(ofp, "\n");
	88	fprintf(ofp, "Actions:\n");
	89	fprintf(ofp, " add-output [-m <SIZE>] [-s <NAME>] [-n <NAME>] <URL> \| -C <URL> -D <URL>\n");
	90	fprintf(ofp, " Setup and add an snapshot output for a session.\n");
	91	fprintf(ofp, "\n");
e0dcb8bf	92	fprintf(ofp, " del-output ID \| NAME [-s <NAME>]\n");
57f272ed DG	93	fprintf(ofp, " Delete an output for a session using the ID.\n");
	94	fprintf(ofp, "\n");
	95	fprintf(ofp, " list-output [-s <NAME>]\n");
	96	fprintf(ofp, " List the output of a session.\n");
	97	fprintf(ofp, "\n");
	98	fprintf(ofp, " record [-m <SIZE>] [-s <NAME>] [-n <NAME>] [<URL> \| -C <URL> -D <URL>]\n");
	99	fprintf(ofp, " Snapshot a session's buffer(s) for all domains. If an URL is\n");
	100	fprintf(ofp, " specified, it is used instead of a previously added output.\n");
e0dcb8bf DG	101	fprintf(ofp, " Specifying only a name or/a size will override the current output value.\n");
	102	fprintf(ofp, " For instance, you can record a snapshot with a custom maximum size\n");
	103	fprintf(ofp, " or with a different name.\n");
57f272ed DG	104	fprintf(ofp, "\n");
	105	fprintf(ofp, "Options:\n");
	106	fprintf(ofp, " -h, --help Show this help\n");
	107	fprintf(ofp, " --list-options Simple listing of options\n");
	108	fprintf(ofp, " -s, --session NAME Apply to session name\n");
	109	fprintf(ofp, " -n, --name NAME Name of the output or snapshot\n");
a8f307d8	110	fprintf(ofp, " -m, --max-size SIZE Maximum bytes size of the snapshot {+k,+M,+G}\n");
57f272ed DG	111	fprintf(ofp, " -C, --ctrl-url URL Set control path URL. (Must use -D also)\n");
	112	fprintf(ofp, " -D, --data-url URL Set data path URL. (Must use -C also)\n");
	113	fprintf(ofp, "\n");
	114	}
	115
	116	/*
	117	* Count and return the number of arguments in argv.
	118	*/
	119	static int count_arguments(const char **argv)
	120	{
	121	int i = 0;
	122
	123	assert(argv);
	124
	125	while (argv[i] != NULL) {
	126	i++;
	127	}
	128
	129	return i;
	130	}
	131
	132	/*
	133	* Create a snapshot output object from arguments using the given URL.
	134	*
	135	* Return a newly allocated object or NULL on error.
	136	*/
	137	static struct lttng_snapshot_output create_output_from_args(const char url)
	138	{
	139	int ret = 0;
	140	struct lttng_snapshot_output *output = NULL;
	141
	142	output = lttng_snapshot_output_create();
	143	if (!output) {
	144	goto error_create;
	145	}
	146
	147	if (url) {
	148	ret = lttng_snapshot_output_set_ctrl_url(url, output);
	149	if (ret < 0) {
	150	goto error;
	151	}
	152	} else if (opt_ctrl_url) {
	153	ret = lttng_snapshot_output_set_ctrl_url(opt_ctrl_url, output);
	154	if (ret < 0) {
	155	goto error;
	156	}
	157	}
	158
	159	if (opt_data_url) {
	160	ret = lttng_snapshot_output_set_data_url(opt_data_url, output);
	161	if (ret < 0) {
	162	goto error;
	163	}
	164	}
	165
	166	if (opt_max_size) {
	167	ret = lttng_snapshot_output_set_size(opt_max_size, output);
	168	if (ret < 0) {
	169	goto error;
	170	}
	171	}
	172
	173	if (opt_output_name) {
	174	ret = lttng_snapshot_output_set_name(opt_output_name, output);
175	if (ret < 0) {
176	goto error;
177	}
178	}
179
180	return output;
181
182	error:
183	lttng_snapshot_output_destroy(output);
184	error_create:
185	return NULL;
186	}
187
50534d6f JRJ	188	static int mi_list_output(void)
	189	{
	190	int ret;
	191	struct lttng_snapshot_output *s_iter;
	192	struct lttng_snapshot_output_list *list;
	193
	194	assert(writer);
	195
	196	ret = lttng_snapshot_list_output(current_session_name, &list);
	197	if (ret < 0) {
	198	goto error;
	199	}
	200
	201	ret = mi_lttng_snapshot_output_session_name(writer, current_session_name);
	202	if (ret) {
	203	ret = CMD_ERROR;
	204	goto end;
	205	}
	206
	207	while ((s_iter = lttng_snapshot_output_list_get_next(list)) != NULL) {
	208	ret = mi_lttng_snapshot_list_output(writer, s_iter);
	209	if (ret) {
	210	ret = CMD_ERROR;
	211	goto end;
	212	}
	213	}
	214
	215
	216	/* Close snapshot snapshots element */
	217	ret = mi_lttng_writer_close_element(writer);
	218	if (ret) {
	219	ret = CMD_ERROR;
	220	goto end;
	221	}
	222
	223	/* Close snapshot session element */
	224	ret = mi_lttng_writer_close_element(writer);
	225	if (ret) {
	226	ret = CMD_ERROR;
	227	}
	228	end:
	229	lttng_snapshot_output_list_destroy(list);
	230	error:
	231	return ret;
	232	}
	233
57f272ed DG	234	static int list_output(void)
	235	{
	236	int ret, output_seen = 0;
	237	struct lttng_snapshot_output *s_iter;
	238	struct lttng_snapshot_output_list *list;
	239
	240	ret = lttng_snapshot_list_output(current_session_name, &list);
	241	if (ret < 0) {
	242	goto error;
	243	}
	244
	245	MSG("Snapshot output list for session %s", current_session_name);
	246
	247	while ((s_iter = lttng_snapshot_output_list_get_next(list)) != NULL) {
c3024823	248	MSG("%s[%" PRIu32 "] %s: %s (max-size: %" PRId64 ")", indent4,
57f272ed DG	249	lttng_snapshot_output_get_id(s_iter),
57f272ed DG	250	lttng_snapshot_output_get_name(s_iter),
c3024823 DG	251	lttng_snapshot_output_get_ctrl_url(s_iter),
c3024823 DG	252	lttng_snapshot_output_get_maxsize(s_iter));
57f272ed DG	253	output_seen = 1;
	254	}
	255
	256	lttng_snapshot_output_list_destroy(list);
	257
	258	if (!output_seen) {
	259	MSG("%sNone", indent4);
	260	}
	261
	262	error:
	263	return ret;
	264	}
	265
50534d6f JRJ	266	/*
	267	* Delete output by ID (machine interface version).
	268	*/
	269	static int mi_del_output(uint32_t id, const char *name)
	270	{
	271	int ret;
	272	struct lttng_snapshot_output *output = NULL;
	273
	274	assert(writer);
	275
	276	output = lttng_snapshot_output_create();
	277	if (!output) {
	278	ret = CMD_FATAL;
	279	goto error;
	280	}
	281
	282	if (name) {
	283	ret = lttng_snapshot_output_set_name(name, output);
	284	} else if (id != UINT32_MAX) {
	285	ret = lttng_snapshot_output_set_id(id, output);
	286	} else {
	287	ret = CMD_ERROR;
	288	goto error;
	289	}
	290	if (ret < 0) {
	291	ret = CMD_FATAL;
	292	goto error;
	293	}
	294
	295	ret = lttng_snapshot_del_output(current_session_name, output);
	296	if (ret < 0) {
	297	ret = CMD_FATAL;
	298	goto error;
	299	}
	300
	301	ret = mi_lttng_snapshot_del_output(writer, id, name, current_session_name);
	302	if (ret) {
	303	ret = CMD_ERROR;
	304	}
	305
	306	error:
	307	lttng_snapshot_output_destroy(output);
	308	return ret;
	309	}
	310
57f272ed DG	311	/*
	312	* Delete output by ID.
	313	*/
eb240553	314	static int del_output(uint32_t id, const char *name)
57f272ed DG	315	{
	316	int ret;
	317	struct lttng_snapshot_output *output = NULL;
	318
	319	output = lttng_snapshot_output_create();
	320	if (!output) {
	321	ret = CMD_FATAL;
	322	goto error;
	323	}
	324
eb240553 DG	325	if (name) {
	326	ret = lttng_snapshot_output_set_name(name, output);
	327	} else if (id != UINT32_MAX) {
	328	ret = lttng_snapshot_output_set_id(id, output);
	329	} else {
	330	ret = CMD_ERROR;
	331	goto error;
	332	}
57f272ed DG	333	if (ret < 0) {
	334	ret = CMD_FATAL;
	335	goto error;
	336	}
	337
	338	ret = lttng_snapshot_del_output(current_session_name, output);
	339	if (ret < 0) {
	340	goto error;
	341	}
	342
eb240553 DG	343	if (id != UINT32_MAX) {
	344	MSG("Snapshot output id %" PRIu32 " successfully deleted for session %s",
	345	id, current_session_name);
	346	} else {
	347	MSG("Snapshot output %s successfully deleted for session %s",
	348	name, current_session_name);
	349	}
57f272ed DG	350
	351	error:
	352	lttng_snapshot_output_destroy(output);
	353	return ret;
	354	}
	355
50534d6f JRJ	356	/*
	357	* Add output from the user URL (machine interface).
	358	*/
	359	static int mi_add_output(const char *url)
	360	{
	361	int ret;
	362	struct lttng_snapshot_output *output = NULL;
	363	char name[NAME_MAX];
	364	const char *n_ptr;
	365
	366	if (!url && (!opt_data_url \|\| !opt_ctrl_url)) {
	367	ret = CMD_ERROR;
	368	goto error;
	369	}
	370
	371	output = create_output_from_args(url);
	372	if (!output) {
	373	ret = CMD_FATAL;
	374	goto error;
	375	}
	376
	377	/* This call, if successful, populates the id of the output object. */
	378	ret = lttng_snapshot_add_output(current_session_name, output);
	379	if (ret < 0) {
	380	ret = CMD_ERROR;
	381	goto error;
	382	}
	383
	384	n_ptr = lttng_snapshot_output_get_name(output);
	385	if (*n_ptr == '\0') {
	386	int pret;
	387	pret = snprintf(name, sizeof(name), DEFAULT_SNAPSHOT_NAME "-%" PRIu32,
	388	lttng_snapshot_output_get_id(output));
	389	if (pret < 0) {
	390	PERROR("snprintf add output name");
	391	}
	392	n_ptr = name;
	393	}
	394
	395	ret = mi_lttng_snapshot_add_output(writer, current_session_name, n_ptr,
	396	output);
	397	if (ret) {
	398	ret = CMD_ERROR;
	399	}
	400
	401	error:
	402	lttng_snapshot_output_destroy(output);
	403	return ret;
	404	}
	405
57f272ed DG	406	/*
	407	* Add output from the user URL.
	408	*/
	409	static int add_output(const char *url)
	410	{
	411	int ret;
	412	struct lttng_snapshot_output *output = NULL;
6efe784e DG	413	char name[NAME_MAX];
6efe784e DG	414	const char *n_ptr;
57f272ed DG	415
	416	if (!url && (!opt_data_url \|\| !opt_ctrl_url)) {
	417	ret = CMD_ERROR;
	418	goto error;
	419	}
	420
	421	output = create_output_from_args(url);
	422	if (!output) {
	423	ret = CMD_FATAL;
	424	goto error;
	425	}
	426
	427	/* This call, if successful, populates the id of the output object. */
	428	ret = lttng_snapshot_add_output(current_session_name, output);
	429	if (ret < 0) {
	430	goto error;
	431	}
	432
6efe784e DG	433	n_ptr = lttng_snapshot_output_get_name(output);
	434	if (*n_ptr == '\0') {
	435	int pret;
	436	pret = snprintf(name, sizeof(name), DEFAULT_SNAPSHOT_NAME "-%" PRIu32,
	437	lttng_snapshot_output_get_id(output));
	438	if (pret < 0) {
	439	PERROR("snprintf add output name");
	440	}
	441	n_ptr = name;
	442	}
	443
57f272ed DG	444	MSG("Snapshot output successfully added for session %s",
	445	current_session_name);
	446	MSG(" [%" PRIu32 "] %s: %s (max-size: %" PRId64 ")",
6efe784e	447	lttng_snapshot_output_get_id(output), n_ptr,
57f272ed DG	448	lttng_snapshot_output_get_ctrl_url(output),
	449	lttng_snapshot_output_get_maxsize(output));
	450	error:
	451	lttng_snapshot_output_destroy(output);
	452	return ret;
	453	}
	454
	455	static int cmd_add_output(int argc, const char **argv)
	456	{
50534d6f	457	int ret;
57f272ed DG	458
	459	if (argc < 2 && (!opt_data_url \|\| !opt_ctrl_url)) {
	460	usage(stderr);
	461	ret = CMD_ERROR;
	462	goto end;
	463	}
	464
50534d6f JRJ	465	if (lttng_opt_mi) {
	466	ret = mi_add_output(argv[1]);
	467	} else {
	468	ret = add_output(argv[1]);
	469	}
57f272ed DG	470
	471	end:
	472	return ret;
	473	}
	474
	475	static int cmd_del_output(int argc, const char **argv)
	476	{
50534d6f	477	int ret;
eb240553 DG	478	char *name;
eb240553 DG	479	long id;
57f272ed DG	480
	481	if (argc < 2) {
	482	usage(stderr);
	483	ret = CMD_ERROR;
	484	goto end;
	485	}
	486
eb240553 DG	487	errno = 0;
	488	id = strtol(argv[1], &name, 10);
	489	if (id == 0 && errno == 0) {
50534d6f JRJ	490	if (lttng_opt_mi) {
	491	ret = mi_del_output(UINT32_MAX, name);
	492	} else {
	493	ret = del_output(UINT32_MAX, name);
	494	}
eb240553	495	} else if (errno == 0 && *name == '\0') {
50534d6f JRJ	496	if (lttng_opt_mi) {
	497	ret = mi_del_output(id, NULL);
	498	} else {
	499	ret = del_output(id, NULL);
	500	}
eb240553 DG	501	} else {
	502	ERR("Argument %s not recognized", argv[1]);
	503	ret = -1;
	504	goto end;
	505	}
57f272ed DG	506
	507	end:
	508	return ret;
	509	}
	510
	511	static int cmd_list_output(int argc, const char **argv)
	512	{
50534d6f JRJ	513	int ret;
	514
	515	if (lttng_opt_mi) {
	516	ret = mi_list_output();
	517	} else {
	518	ret = list_output();
	519	}
	520
	521	return ret;
	522	}
	523
	524	/*
	525	* Do a snapshot record with the URL if one is given (machine interface).
	526	*/
	527	static int mi_record(const char *url)
	528	{
	529	int ret;
	530	struct lttng_snapshot_output *output = NULL;
	531
	532	output = create_output_from_args(url);
	533	if (!output) {
	534	ret = CMD_FATAL;
	535	goto error;
	536	}
	537
	538	ret = lttng_snapshot_record(current_session_name, output, 0);
	539	if (ret < 0) {
	540	ret = CMD_ERROR;
	541	goto error;
	542	}
	543
	544	ret = mi_lttng_snapshot_record(writer, current_session_name, url,
	545	opt_ctrl_url, opt_data_url);
	546	if (ret) {
	547	ret = CMD_ERROR;
	548	}
	549
	550	error:
	551	lttng_snapshot_output_destroy(output);
	552	return ret;
57f272ed DG	553	}
	554
	555	/*
	556	* Do a snapshot record with the URL if one is given.
	557	*/
	558	static int record(const char *url)
	559	{
	560	int ret;
	561	struct lttng_snapshot_output *output = NULL;
	562
e1986656 DG	563	output = create_output_from_args(url);
	564	if (!output) {
	565	ret = CMD_FATAL;
	566	goto error;
57f272ed DG	567	}
	568
	569	ret = lttng_snapshot_record(current_session_name, output, 0);
	570	if (ret < 0) {
68808f4e DG	571	if (ret == -LTTNG_ERR_MAX_SIZE_INVALID) {
	572	ERR("The minimum size of a snapshot is computed by multiplying "
	573	"the total amount of streams with the largest subbuffer "
	574	"in the session.");
	575	}
57f272ed DG	576	goto error;
	577	}
	578
	579	MSG("Snapshot recorded successfully for session %s", current_session_name);
	580
	581	if (url) {
	582	MSG("Snapshot written at: %s", url);
	583	} else if (opt_ctrl_url) {
	584	MSG("Snapshot written to ctrl: %s, data: %s", opt_ctrl_url,
	585	opt_data_url);
57f272ed DG	586	}
	587
	588	error:
cdcdb9dd	589	lttng_snapshot_output_destroy(output);
57f272ed DG	590	return ret;
	591	}
	592
	593	static int cmd_record(int argc, const char **argv)
	594	{
	595	int ret;
	596
	597	if (argc == 2) {
	598	/* With a given URL */
50534d6f JRJ	599	if (lttng_opt_mi) {
	600	ret = mi_record(argv[1]);
	601	} else {
	602	ret = record(argv[1]);
	603	}
57f272ed	604	} else {
50534d6f JRJ	605	if (lttng_opt_mi) {
	606	ret = mi_record(NULL);
	607	} else {
	608	ret = record(NULL);
	609	}
57f272ed DG	610	}
	611
	612	return ret;
	613	}
	614
	615	static int handle_command(const char **argv)
	616	{
50534d6f	617	int ret = CMD_SUCCESS, i = 0, argc, command_ret = CMD_SUCCESS;
57f272ed DG	618	struct cmd_struct *cmd;
	619
	620	if (argv == NULL \|\| (!opt_ctrl_url && opt_data_url) \|\|
	621	(opt_ctrl_url && !opt_data_url)) {
	622	usage(stderr);
50534d6f	623	command_ret = CMD_ERROR;
57f272ed DG	624	goto end;
	625	}
	626
	627	argc = count_arguments(argv);
	628
	629	cmd = &actions[i];
	630	while (cmd->func != NULL) {
	631	/* Find command */
	632	if (strcmp(argv[0], cmd->name) == 0) {
50534d6f JRJ	633	if (lttng_opt_mi) {
	634	/* Action element */
	635	ret = mi_lttng_writer_open_element(writer,
	636	mi_lttng_element_command_action);
	637	if (ret) {
	638	ret = CMD_ERROR;
	639	goto end;
	640	}
	641
	642	/* Name of the action */
	643	ret = mi_lttng_writer_write_element_string(writer,
	644	config_element_name, argv[0]);
	645	if (ret) {
	646	ret = CMD_ERROR;
	647	goto end;
	648	}
	649
	650	/* Open output element */
	651	ret = mi_lttng_writer_open_element(writer,
	652	mi_lttng_element_command_output);
	653	if (ret) {
	654	ret = CMD_ERROR;
	655	goto end;
	656	}
	657	}
	658
	659	command_ret = cmd->func(argc, argv);
	660
	661	if (lttng_opt_mi) {
	662	/* Close output and action element */
	663	ret = mi_lttng_close_multi_element(writer, 2);
	664	if (ret) {
	665	ret = CMD_ERROR;
	666	goto end;
	667	}
	668	}
57f272ed DG	669	goto end;
	670	}
	671	i++;
	672	cmd = &actions[i];
	673	}
	674
50534d6f	675	ret = -CMD_UNDEFINED;
57f272ed DG	676
57f272ed DG	677	end:
50534d6f JRJ	678	/* Overwrite ret if an error occured in cmd->func() */
50534d6f JRJ	679	ret = command_ret ? command_ret : ret;
57f272ed DG	680	return ret;
57f272ed DG	681	}
57f272ed DG	682	/*
	683	* The 'snapshot <cmd> <options>' first level command
	684	*/
	685	int cmd_snapshot(int argc, const char **argv)
	686	{
50534d6f	687	int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
57f272ed DG	688	char *session_name = NULL;
	689	static poptContext pc;
	690
	691	pc = poptGetContext(NULL, argc, argv, snapshot_opts, 0);
	692	poptReadDefaultConfig(pc, 0);
	693
50534d6f	694	/* Mi check */
c7e35b03	695	if (lttng_opt_mi) {
50534d6f JRJ	696	writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
	697	if (!writer) {
	698	ret = -LTTNG_ERR_NOMEM;
	699	goto end;
	700	}
	701
	702	/* Open command element */
	703	ret = mi_lttng_writer_command_open(writer,
	704	mi_lttng_element_command_snapshot);
	705	if (ret) {
	706	ret = CMD_ERROR;
	707	goto end;
	708	}
	709
	710	/* Open output element */
	711	ret = mi_lttng_writer_open_element(writer,
	712	mi_lttng_element_command_output);
	713	if (ret) {
	714	ret = CMD_ERROR;
	715	goto end;
	716	}
c7e35b03 JR	717	}
c7e35b03 JR	718
57f272ed DG	719	while ((opt = poptGetNextOpt(pc)) != -1) {
	720	switch (opt) {
	721	case OPT_HELP:
	722	usage(stdout);
	723	goto end;
	724	case OPT_LIST_OPTIONS:
	725	list_cmd_options(stdout, snapshot_opts);
	726	goto end;
3c9bd23c SM	727	case OPT_LIST_COMMANDS:
	728	list_commands(actions, stdout);
	729	goto end;
57f272ed DG	730	case OPT_MAX_SIZE:
57f272ed DG	731	{
a8f307d8	732	uint64_t val;
57f272ed DG	733	const char *opt = poptGetOptArg(pc);
57f272ed DG	734
a8f307d8	735	if (utils_parse_size_suffix((char *) opt, &val) < 0) {
57f272ed DG	736	ERR("Unable to handle max-size value %s", opt);
	737	ret = CMD_ERROR;
	738	goto end;
	739	}
	740
57f272ed DG	741	opt_max_size = val;
	742
	743	break;
	744	}
	745	default:
	746	usage(stderr);
	747	ret = CMD_UNDEFINED;
	748	goto end;
	749	}
	750	}
	751
	752	if (!opt_session_name) {
	753	session_name = get_session_name();
	754	if (session_name == NULL) {
	755	ret = CMD_ERROR;
	756	goto end;
	757	}
	758	current_session_name = session_name;
	759	} else {
	760	current_session_name = opt_session_name;
	761	}
	762
50534d6f JRJ	763	command_ret = handle_command(poptGetArgs(pc));
	764	if (command_ret < 0) {
	765	switch (-command_ret) {
7badf927	766	case LTTNG_ERR_EPERM:
6dc3064a	767	ERR("The session needs to be set in no output mode (--no-output)");
7badf927 DG	768	break;
7badf927 DG	769	case LTTNG_ERR_SNAPSHOT_NODATA:
50534d6f	770	WARN("%s", lttng_strerror(command_ret));
7badf927 DG	771	break;
7badf927 DG	772	default:
50534d6f	773	ERR("%s", lttng_strerror(command_ret));
7badf927	774	break;
6dc3064a	775	}
50534d6f JRJ	776	success = 0;
	777	}
	778
	779	if (lttng_opt_mi) {
	780	/* Close output element */
	781	ret = mi_lttng_writer_close_element(writer);
	782	if (ret) {
	783	ret = CMD_ERROR;
	784	goto end;
	785	}
	786
	787	/* Success ? */
	788	ret = mi_lttng_writer_write_element_bool(writer,
	789	mi_lttng_element_command_success, success);
	790	if (ret) {
	791	ret = CMD_ERROR;
	792	goto end;
	793	}
	794
	795	/* Command element close */
	796	ret = mi_lttng_writer_command_close(writer);
	797	if (ret) {
	798	ret = CMD_ERROR;
	799	goto end;
	800	}
57f272ed DG	801	}
	802
	803	end:
50534d6f JRJ	804	/* Mi clean-up */
	805	if (writer && mi_lttng_writer_destroy(writer)) {
	806	/* Preserve original error code */
	807	ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
	808	}
	809
57f272ed DG	810	if (!opt_session_name) {
	811	free(session_name);
	812	}
50534d6f JRJ	813
	814	/* Overwrite ret if an error occured during handle_command */
	815	ret = command_ret ? command_ret : ret;
57f272ed DG	816	poptFreeContext(pc);
	817	return ret;
	818	}