[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 _LGPL_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 */
};

/*
 * 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 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);

	if (lttng_opt_mi) {
		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) {
		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;
		if (lttng_opt_mi) {
			ret = mi_lttng_snapshot_list_output(writer, s_iter);
			if (ret) {
				ret = CMD_ERROR;
				goto end;
			}
		}
	}

	if (lttng_opt_mi) {
		/* 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);

	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) {
		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) {
		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)) {
		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) {
		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;

	ret = list_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("Invalid snapshot size. Cannot fit at least one packet per stream.");
		}
		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);
	}

	if (lttng_opt_mi) {
		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;
}

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

	if (argc == 2) {
		ret = record(argv[1]);
	} 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)) {
		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 occurred 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:
			SHOW_HELP();
			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:
			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) {
		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));

			/*  A warning is fine since the user has no control on
			 *  whether or not applications (or the kernel) have
			 *  produced any event between the start of the tracing
			 *  session and the recording of the snapshot. MI wise
			 *  the command is not a success since nothing was
			 *  recorded.
			 */
			command_ret = 0;
			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
6c1c0768	18	#define _LGPL_SOURCE
57f272ed DG	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
57f272ed DG	81	/*
	82	* Count and return the number of arguments in argv.
	83	*/
	84	static int count_arguments(const char **argv)
	85	{
	86	int i = 0;
	87
	88	assert(argv);
	89
	90	while (argv[i] != NULL) {
	91	i++;
	92	}
	93
	94	return i;
	95	}
	96
	97	/*
	98	* Create a snapshot output object from arguments using the given URL.
	99	*
	100	* Return a newly allocated object or NULL on error.
	101	*/
	102	static struct lttng_snapshot_output create_output_from_args(const char url)
	103	{
	104	int ret = 0;
	105	struct lttng_snapshot_output *output = NULL;
	106
	107	output = lttng_snapshot_output_create();
	108	if (!output) {
	109	goto error_create;
	110	}
	111
	112	if (url) {
	113	ret = lttng_snapshot_output_set_ctrl_url(url, output);
	114	if (ret < 0) {
	115	goto error;
	116	}
	117	} else if (opt_ctrl_url) {
	118	ret = lttng_snapshot_output_set_ctrl_url(opt_ctrl_url, output);
	119	if (ret < 0) {
	120	goto error;
	121	}
	122	}
	123
	124	if (opt_data_url) {
	125	ret = lttng_snapshot_output_set_data_url(opt_data_url, output);
	126	if (ret < 0) {
	127	goto error;
	128	}
	129	}
	130
	131	if (opt_max_size) {
	132	ret = lttng_snapshot_output_set_size(opt_max_size, output);
	133	if (ret < 0) {
	134	goto error;
	135	}
	136	}
	137
	138	if (opt_output_name) {
	139	ret = lttng_snapshot_output_set_name(opt_output_name, output);
	140	if (ret < 0) {
	141	goto error;
	142	}
	143	}
	144
145	return output;
146
147	error:
148	lttng_snapshot_output_destroy(output);
149	error_create:
150	return NULL;
151	}
152
8e610b42	153	static int list_output(void)
50534d6f	154	{
8e610b42	155	int ret, output_seen = 0;
50534d6f JRJ	156	struct lttng_snapshot_output *s_iter;
	157	struct lttng_snapshot_output_list *list;
	158
50534d6f JRJ	159	ret = lttng_snapshot_list_output(current_session_name, &list);
	160	if (ret < 0) {
	161	goto error;
	162	}
	163
8e610b42	164	MSG("Snapshot output list for session %s", current_session_name);
50534d6f	165
8e610b42 JR	166	if (lttng_opt_mi) {
	167	ret = mi_lttng_snapshot_output_session_name(writer,
	168	current_session_name);
50534d6f JRJ	169	if (ret) {
	170	ret = CMD_ERROR;
	171	goto end;
	172	}
	173	}
	174
57f272ed	175	while ((s_iter = lttng_snapshot_output_list_get_next(list)) != NULL) {
c3024823	176	MSG("%s[%" PRIu32 "] %s: %s (max-size: %" PRId64 ")", indent4,
57f272ed DG	177	lttng_snapshot_output_get_id(s_iter),
57f272ed DG	178	lttng_snapshot_output_get_name(s_iter),
c3024823 DG	179	lttng_snapshot_output_get_ctrl_url(s_iter),
c3024823 DG	180	lttng_snapshot_output_get_maxsize(s_iter));
57f272ed	181	output_seen = 1;
8e610b42 JR	182	if (lttng_opt_mi) {
	183	ret = mi_lttng_snapshot_list_output(writer, s_iter);
	184	if (ret) {
	185	ret = CMD_ERROR;
	186	goto end;
	187	}
	188	}
57f272ed DG	189	}
57f272ed DG	190
8e610b42 JR	191	if (lttng_opt_mi) {
	192	/* Close snapshot snapshots element */
	193	ret = mi_lttng_writer_close_element(writer);
	194	if (ret) {
	195	ret = CMD_ERROR;
	196	goto end;
	197	}
	198
	199	/* Close snapshot session element */
	200	ret = mi_lttng_writer_close_element(writer);
	201	if (ret) {
	202	ret = CMD_ERROR;
	203	}
	204	}
	205	end:
57f272ed DG	206	lttng_snapshot_output_list_destroy(list);
	207
	208	if (!output_seen) {
	209	MSG("%sNone", indent4);
	210	}
	211
	212	error:
	213	return ret;
	214	}
	215
50534d6f JRJ	216	/*
	217	* Delete output by ID (machine interface version).
	218	*/
	219	static int mi_del_output(uint32_t id, const char *name)
	220	{
	221	int ret;
	222	struct lttng_snapshot_output *output = NULL;
	223
	224	assert(writer);
	225
	226	output = lttng_snapshot_output_create();
	227	if (!output) {
	228	ret = CMD_FATAL;
	229	goto error;
	230	}
	231
	232	if (name) {
	233	ret = lttng_snapshot_output_set_name(name, output);
	234	} else if (id != UINT32_MAX) {
	235	ret = lttng_snapshot_output_set_id(id, output);
	236	} else {
	237	ret = CMD_ERROR;
	238	goto error;
	239	}
	240	if (ret < 0) {
	241	ret = CMD_FATAL;
	242	goto error;
	243	}
	244
	245	ret = lttng_snapshot_del_output(current_session_name, output);
	246	if (ret < 0) {
50534d6f JRJ	247	goto error;
	248	}
	249
	250	ret = mi_lttng_snapshot_del_output(writer, id, name, current_session_name);
	251	if (ret) {
	252	ret = CMD_ERROR;
	253	}
	254
	255	error:
	256	lttng_snapshot_output_destroy(output);
	257	return ret;
	258	}
	259
57f272ed DG	260	/*
	261	* Delete output by ID.
	262	*/
eb240553	263	static int del_output(uint32_t id, const char *name)
57f272ed DG	264	{
	265	int ret;
	266	struct lttng_snapshot_output *output = NULL;
	267
	268	output = lttng_snapshot_output_create();
	269	if (!output) {
	270	ret = CMD_FATAL;
	271	goto error;
	272	}
	273
eb240553 DG	274	if (name) {
	275	ret = lttng_snapshot_output_set_name(name, output);
	276	} else if (id != UINT32_MAX) {
	277	ret = lttng_snapshot_output_set_id(id, output);
	278	} else {
	279	ret = CMD_ERROR;
	280	goto error;
	281	}
57f272ed DG	282	if (ret < 0) {
	283	ret = CMD_FATAL;
	284	goto error;
	285	}
	286
	287	ret = lttng_snapshot_del_output(current_session_name, output);
	288	if (ret < 0) {
	289	goto error;
	290	}
	291
eb240553 DG	292	if (id != UINT32_MAX) {
	293	MSG("Snapshot output id %" PRIu32 " successfully deleted for session %s",
	294	id, current_session_name);
	295	} else {
	296	MSG("Snapshot output %s successfully deleted for session %s",
	297	name, current_session_name);
	298	}
57f272ed DG	299
	300	error:
	301	lttng_snapshot_output_destroy(output);
	302	return ret;
	303	}
	304
50534d6f JRJ	305	/*
	306	* Add output from the user URL (machine interface).
	307	*/
	308	static int mi_add_output(const char *url)
	309	{
	310	int ret;
	311	struct lttng_snapshot_output *output = NULL;
	312	char name[NAME_MAX];
	313	const char *n_ptr;
	314
	315	if (!url && (!opt_data_url \|\| !opt_ctrl_url)) {
	316	ret = CMD_ERROR;
	317	goto error;
	318	}
	319
	320	output = create_output_from_args(url);
	321	if (!output) {
	322	ret = CMD_FATAL;
	323	goto error;
	324	}
	325
	326	/* This call, if successful, populates the id of the output object. */
	327	ret = lttng_snapshot_add_output(current_session_name, output);
	328	if (ret < 0) {
50534d6f JRJ	329	goto error;
	330	}
	331
	332	n_ptr = lttng_snapshot_output_get_name(output);
	333	if (*n_ptr == '\0') {
	334	int pret;
	335	pret = snprintf(name, sizeof(name), DEFAULT_SNAPSHOT_NAME "-%" PRIu32,
	336	lttng_snapshot_output_get_id(output));
	337	if (pret < 0) {
	338	PERROR("snprintf add output name");
	339	}
	340	n_ptr = name;
	341	}
	342
	343	ret = mi_lttng_snapshot_add_output(writer, current_session_name, n_ptr,
	344	output);
	345	if (ret) {
	346	ret = CMD_ERROR;
	347	}
	348
	349	error:
	350	lttng_snapshot_output_destroy(output);
	351	return ret;
	352	}
	353
57f272ed DG	354	/*
	355	* Add output from the user URL.
	356	*/
	357	static int add_output(const char *url)
	358	{
	359	int ret;
	360	struct lttng_snapshot_output *output = NULL;
6efe784e DG	361	char name[NAME_MAX];
6efe784e DG	362	const char *n_ptr;
57f272ed DG	363
	364	if (!url && (!opt_data_url \|\| !opt_ctrl_url)) {
	365	ret = CMD_ERROR;
	366	goto error;
	367	}
	368
	369	output = create_output_from_args(url);
	370	if (!output) {
	371	ret = CMD_FATAL;
	372	goto error;
	373	}
	374
	375	/* This call, if successful, populates the id of the output object. */
	376	ret = lttng_snapshot_add_output(current_session_name, output);
	377	if (ret < 0) {
	378	goto error;
	379	}
	380
6efe784e DG	381	n_ptr = lttng_snapshot_output_get_name(output);
	382	if (*n_ptr == '\0') {
	383	int pret;
	384	pret = snprintf(name, sizeof(name), DEFAULT_SNAPSHOT_NAME "-%" PRIu32,
	385	lttng_snapshot_output_get_id(output));
	386	if (pret < 0) {
	387	PERROR("snprintf add output name");
	388	}
	389	n_ptr = name;
	390	}
	391
57f272ed DG	392	MSG("Snapshot output successfully added for session %s",
	393	current_session_name);
	394	MSG(" [%" PRIu32 "] %s: %s (max-size: %" PRId64 ")",
6efe784e	395	lttng_snapshot_output_get_id(output), n_ptr,
57f272ed DG	396	lttng_snapshot_output_get_ctrl_url(output),
	397	lttng_snapshot_output_get_maxsize(output));
	398	error:
	399	lttng_snapshot_output_destroy(output);
	400	return ret;
	401	}
	402
	403	static int cmd_add_output(int argc, const char **argv)
	404	{
50534d6f	405	int ret;
57f272ed DG	406
57f272ed DG	407	if (argc < 2 && (!opt_data_url \|\| !opt_ctrl_url)) {
57f272ed DG	408	ret = CMD_ERROR;
	409	goto end;
	410	}
	411
50534d6f JRJ	412	if (lttng_opt_mi) {
	413	ret = mi_add_output(argv[1]);
	414	} else {
	415	ret = add_output(argv[1]);
	416	}
57f272ed DG	417
	418	end:
	419	return ret;
	420	}
	421
	422	static int cmd_del_output(int argc, const char **argv)
	423	{
50534d6f	424	int ret;
eb240553 DG	425	char *name;
eb240553 DG	426	long id;
57f272ed DG	427
57f272ed DG	428	if (argc < 2) {
57f272ed DG	429	ret = CMD_ERROR;
	430	goto end;
	431	}
	432
eb240553 DG	433	errno = 0;
	434	id = strtol(argv[1], &name, 10);
	435	if (id == 0 && errno == 0) {
50534d6f JRJ	436	if (lttng_opt_mi) {
	437	ret = mi_del_output(UINT32_MAX, name);
	438	} else {
	439	ret = del_output(UINT32_MAX, name);
	440	}
eb240553	441	} else if (errno == 0 && *name == '\0') {
50534d6f JRJ	442	if (lttng_opt_mi) {
	443	ret = mi_del_output(id, NULL);
	444	} else {
	445	ret = del_output(id, NULL);
	446	}
eb240553 DG	447	} else {
	448	ERR("Argument %s not recognized", argv[1]);
	449	ret = -1;
	450	goto end;
	451	}
57f272ed DG	452
	453	end:
	454	return ret;
	455	}
	456
	457	static int cmd_list_output(int argc, const char **argv)
	458	{
50534d6f JRJ	459	int ret;
50534d6f JRJ	460
8e610b42	461	ret = list_output();
50534d6f JRJ	462
	463	return ret;
	464	}
	465
57f272ed DG	466	/*
	467	* Do a snapshot record with the URL if one is given.
	468	*/
	469	static int record(const char *url)
	470	{
	471	int ret;
	472	struct lttng_snapshot_output *output = NULL;
	473
e1986656 DG	474	output = create_output_from_args(url);
	475	if (!output) {
	476	ret = CMD_FATAL;
	477	goto error;
57f272ed DG	478	}
	479
	480	ret = lttng_snapshot_record(current_session_name, output, 0);
	481	if (ret < 0) {
68808f4e	482	if (ret == -LTTNG_ERR_MAX_SIZE_INVALID) {
d07ceecd	483	ERR("Invalid snapshot size. Cannot fit at least one packet per stream.");
68808f4e	484	}
57f272ed DG	485	goto error;
	486	}
	487
	488	MSG("Snapshot recorded successfully for session %s", current_session_name);
	489
	490	if (url) {
	491	MSG("Snapshot written at: %s", url);
	492	} else if (opt_ctrl_url) {
	493	MSG("Snapshot written to ctrl: %s, data: %s", opt_ctrl_url,
	494	opt_data_url);
57f272ed DG	495	}
57f272ed DG	496
1862dfe0 JR	497	if (lttng_opt_mi) {
	498	ret = mi_lttng_snapshot_record(writer, current_session_name, url,
	499	opt_ctrl_url, opt_data_url);
	500	if (ret) {
	501	ret = CMD_ERROR;
	502	}
	503	}
	504
57f272ed	505	error:
cdcdb9dd	506	lttng_snapshot_output_destroy(output);
57f272ed DG	507	return ret;
	508	}
	509
	510	static int cmd_record(int argc, const char **argv)
	511	{
	512	int ret;
	513
	514	if (argc == 2) {
1862dfe0	515	ret = record(argv[1]);
57f272ed	516	} else {
1862dfe0	517	ret = record(NULL);
57f272ed DG	518	}
	519
	520	return ret;
	521	}
	522
	523	static int handle_command(const char **argv)
	524	{
50534d6f	525	int ret = CMD_SUCCESS, i = 0, argc, command_ret = CMD_SUCCESS;
57f272ed DG	526	struct cmd_struct *cmd;
	527
	528	if (argv == NULL \|\| (!opt_ctrl_url && opt_data_url) \|\|
	529	(opt_ctrl_url && !opt_data_url)) {
50534d6f	530	command_ret = CMD_ERROR;
57f272ed DG	531	goto end;
	532	}
	533
	534	argc = count_arguments(argv);
	535
	536	cmd = &actions[i];
	537	while (cmd->func != NULL) {
	538	/* Find command */
	539	if (strcmp(argv[0], cmd->name) == 0) {
50534d6f JRJ	540	if (lttng_opt_mi) {
	541	/* Action element */
	542	ret = mi_lttng_writer_open_element(writer,
	543	mi_lttng_element_command_action);
	544	if (ret) {
	545	ret = CMD_ERROR;
	546	goto end;
	547	}
	548
	549	/* Name of the action */
	550	ret = mi_lttng_writer_write_element_string(writer,
	551	config_element_name, argv[0]);
	552	if (ret) {
	553	ret = CMD_ERROR;
	554	goto end;
	555	}
	556
	557	/* Open output element */
	558	ret = mi_lttng_writer_open_element(writer,
	559	mi_lttng_element_command_output);
	560	if (ret) {
	561	ret = CMD_ERROR;
	562	goto end;
	563	}
	564	}
	565
	566	command_ret = cmd->func(argc, argv);
	567
	568	if (lttng_opt_mi) {
	569	/* Close output and action element */
	570	ret = mi_lttng_close_multi_element(writer, 2);
	571	if (ret) {
	572	ret = CMD_ERROR;
	573	goto end;
	574	}
	575	}
57f272ed DG	576	goto end;
	577	}
	578	i++;
	579	cmd = &actions[i];
	580	}
	581
1ec06ed3	582	ret = CMD_UNDEFINED;
57f272ed DG	583
57f272ed DG	584	end:
1ec06ed3	585	/* Overwrite ret if an error occurred in cmd->func() */
50534d6f	586	ret = command_ret ? command_ret : ret;
57f272ed DG	587	return ret;
57f272ed DG	588	}
57f272ed DG	589	/*
	590	* The 'snapshot <cmd> <options>' first level command
	591	*/
	592	int cmd_snapshot(int argc, const char **argv)
	593	{
50534d6f	594	int opt, ret = CMD_SUCCESS, command_ret = CMD_SUCCESS, success = 1;
57f272ed DG	595	char *session_name = NULL;
	596	static poptContext pc;
	597
	598	pc = poptGetContext(NULL, argc, argv, snapshot_opts, 0);
	599	poptReadDefaultConfig(pc, 0);
	600
50534d6f	601	/* Mi check */
c7e35b03	602	if (lttng_opt_mi) {
50534d6f JRJ	603	writer = mi_lttng_writer_create(fileno(stdout), lttng_opt_mi);
	604	if (!writer) {
	605	ret = -LTTNG_ERR_NOMEM;
	606	goto end;
	607	}
	608
	609	/* Open command element */
	610	ret = mi_lttng_writer_command_open(writer,
	611	mi_lttng_element_command_snapshot);
	612	if (ret) {
	613	ret = CMD_ERROR;
	614	goto end;
	615	}
	616
	617	/* Open output element */
	618	ret = mi_lttng_writer_open_element(writer,
	619	mi_lttng_element_command_output);
	620	if (ret) {
	621	ret = CMD_ERROR;
	622	goto end;
	623	}
c7e35b03 JR	624	}
c7e35b03 JR	625
57f272ed DG	626	while ((opt = poptGetNextOpt(pc)) != -1) {
	627	switch (opt) {
	628	case OPT_HELP:
4ba92f18	629	SHOW_HELP();
57f272ed DG	630	goto end;
	631	case OPT_LIST_OPTIONS:
	632	list_cmd_options(stdout, snapshot_opts);
	633	goto end;
3c9bd23c SM	634	case OPT_LIST_COMMANDS:
	635	list_commands(actions, stdout);
	636	goto end;
57f272ed DG	637	case OPT_MAX_SIZE:
57f272ed DG	638	{
a8f307d8	639	uint64_t val;
57f272ed DG	640	const char *opt = poptGetOptArg(pc);
57f272ed DG	641
a8f307d8	642	if (utils_parse_size_suffix((char *) opt, &val) < 0) {
57f272ed DG	643	ERR("Unable to handle max-size value %s", opt);
	644	ret = CMD_ERROR;
	645	goto end;
	646	}
	647
57f272ed DG	648	opt_max_size = val;
	649
	650	break;
	651	}
	652	default:
57f272ed DG	653	ret = CMD_UNDEFINED;
	654	goto end;
	655	}
	656	}
	657
	658	if (!opt_session_name) {
	659	session_name = get_session_name();
	660	if (session_name == NULL) {
	661	ret = CMD_ERROR;
	662	goto end;
	663	}
	664	current_session_name = session_name;
	665	} else {
	666	current_session_name = opt_session_name;
	667	}
	668
50534d6f	669	command_ret = handle_command(poptGetArgs(pc));
1ec06ed3	670	if (command_ret) {
50534d6f	671	switch (-command_ret) {
7badf927	672	case LTTNG_ERR_EPERM:
6dc3064a	673	ERR("The session needs to be set in no output mode (--no-output)");
7badf927 DG	674	break;
7badf927 DG	675	case LTTNG_ERR_SNAPSHOT_NODATA:
50534d6f	676	WARN("%s", lttng_strerror(command_ret));
dad01b0a JR	677
	678	/* A warning is fine since the user has no control on
	679	* whether or not applications (or the kernel) have
	680	* produced any event between the start of the tracing
	681	* session and the recording of the snapshot. MI wise
	682	* the command is not a success since nothing was
	683	* recorded.
	684	*/
	685	command_ret = 0;
7badf927 DG	686	break;
7badf927 DG	687	default:
50534d6f	688	ERR("%s", lttng_strerror(command_ret));
7badf927	689	break;
6dc3064a	690	}
50534d6f JRJ	691	success = 0;
	692	}
	693
	694	if (lttng_opt_mi) {
	695	/* Close output element */
	696	ret = mi_lttng_writer_close_element(writer);
	697	if (ret) {
	698	ret = CMD_ERROR;
	699	goto end;
	700	}
	701
	702	/* Success ? */
	703	ret = mi_lttng_writer_write_element_bool(writer,
	704	mi_lttng_element_command_success, success);
	705	if (ret) {
	706	ret = CMD_ERROR;
	707	goto end;
	708	}
	709
	710	/* Command element close */
	711	ret = mi_lttng_writer_command_close(writer);
	712	if (ret) {
	713	ret = CMD_ERROR;
	714	goto end;
	715	}
57f272ed DG	716	}
	717
	718	end:
50534d6f JRJ	719	/* Mi clean-up */
	720	if (writer && mi_lttng_writer_destroy(writer)) {
	721	/* Preserve original error code */
	722	ret = ret ? ret : -LTTNG_ERR_MI_IO_FAIL;
	723	}
	724
57f272ed DG	725	if (!opt_session_name) {
	726	free(session_name);
	727	}
50534d6f JRJ	728
	729	/* Overwrite ret if an error occured during handle_command */
	730	ret = command_ret ? command_ret : ret;
57f272ed DG	731	poptFreeContext(pc);
	732	return ret;
	733	}