[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 <common/utils.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,
};

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},
	{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 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", indent4,
				lttng_snapshot_output_get_id(s_iter),
				lttng_snapshot_output_get_name(s_iter),
				lttng_snapshot_output_get_ctrl_url(s_iter));
		output_seen = 1;
	}

	lttng_snapshot_output_list_destroy(list);

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

error:
	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.
 */
static int add_output(const char *url)
{
	int ret;
	struct lttng_snapshot_output *output = NULL;

	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;
	}

	MSG("Snapshot output successfully added for session %s",
			current_session_name);
	MSG("  [%" PRIu32 "] %s: %s (max-size: %" PRId64 ")",
			lttng_snapshot_output_get_id(output),
			lttng_snapshot_output_get_name(output),
			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 = CMD_SUCCESS;

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

	ret = add_output(argv[1]);

end:
	return ret;
}

static int cmd_del_output(int argc, const char **argv)
{
	int ret = CMD_SUCCESS;
	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) {
		ret = del_output(UINT32_MAX, name);
	} else if (errno == 0 && *name == '\0') {
		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)
{
	return list_output();
}

/*
 * 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) {
		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 */
		ret = record(argv[1]);
	} else {
		ret = record(NULL);
	}

	return ret;
}

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

	if (argv == NULL || (!opt_ctrl_url && opt_data_url) ||
			(opt_ctrl_url && !opt_data_url)) {
		usage(stderr);
		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) {
			ret = cmd->func(argc, argv);
			goto end;
		}
		i++;
		cmd = &actions[i];
	}

	/* Command not found */
	ret = CMD_UNDEFINED;

end:
	return ret;
}

/*
 * The 'snapshot <cmd> <options>' first level command
 */
int cmd_snapshot(int argc, const char **argv)
{
	int opt, ret = CMD_SUCCESS;
	char *session_name = NULL;
	static poptContext pc;

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

	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_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;
	}

	ret = handle_command(poptGetArgs(pc));
	if (ret < 0) {
		if (ret == -LTTNG_ERR_EPERM) {
			ERR("The session needs to be set in no output mode (--no-output)");
		}
		ERR("%s", lttng_strerror(ret));
		goto end;
	}

end:
	if (!opt_session_name) {
		free(session_name);
	}
	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>
	28
a8f307d8	29	#include <common/utils.h>
57f272ed DG	30	#include <lttng/snapshot.h>
	31
	32	#include "../command.h"
	33
	34	static const char *opt_session_name;
	35	static const char *opt_output_name;
	36	static const char *opt_data_url;
	37	static const char *opt_ctrl_url;
	38	static const char *current_session_name;
	39	static uint64_t opt_max_size;
	40
	41	/* Stub for the cmd struct actions. */
	42	static int cmd_add_output(int argc, const char **argv);
	43	static int cmd_del_output(int argc, const char **argv);
	44	static int cmd_list_output(int argc, const char **argv);
	45	static int cmd_record(int argc, const char **argv);
	46
	47	static const char *indent4 = " ";
	48
	49	enum {
	50	OPT_HELP = 1,
	51	OPT_LIST_OPTIONS,
	52	OPT_MAX_SIZE,
	53	};
	54
	55	static struct poptOption snapshot_opts[] = {
	56	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	57	{"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
	58	{"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
	59	{"ctrl-url", 'C', POPT_ARG_STRING, &opt_ctrl_url, 0, 0, 0},
	60	{"data-url", 'D', POPT_ARG_STRING, &opt_data_url, 0, 0, 0},
	61	{"name", 'n', POPT_ARG_STRING, &opt_output_name, 0, 0, 0},
a8f307d8	62	{"max-size", 'm', POPT_ARG_STRING, 0, OPT_MAX_SIZE, 0, 0},
57f272ed DG	63	{"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
	64	{0, 0, 0, 0, 0, 0, 0}
	65	};
	66
	67	static struct cmd_struct actions[] = {
	68	{ "add-output", cmd_add_output },
	69	{ "del-output", cmd_del_output },
	70	{ "list-output", cmd_list_output },
	71	{ "record", cmd_record },
	72	{ NULL, NULL } /* Array closure */
	73	};
	74
	75	/*
	76	* usage
	77	*/
	78	static void usage(FILE *ofp)
	79	{
8df3bfe9	80	fprintf(ofp, "usage: lttng snapshot [OPTION] ACTION\n");
57f272ed DG	81	fprintf(ofp, "\n");
	82	fprintf(ofp, "Actions:\n");
	83	fprintf(ofp, " add-output [-m <SIZE>] [-s <NAME>] [-n <NAME>] <URL> \| -C <URL> -D <URL>\n");
	84	fprintf(ofp, " Setup and add an snapshot output for a session.\n");
	85	fprintf(ofp, "\n");
e0dcb8bf	86	fprintf(ofp, " del-output ID \| NAME [-s <NAME>]\n");
57f272ed DG	87	fprintf(ofp, " Delete an output for a session using the ID.\n");
	88	fprintf(ofp, "\n");
	89	fprintf(ofp, " list-output [-s <NAME>]\n");
	90	fprintf(ofp, " List the output of a session.\n");
	91	fprintf(ofp, "\n");
	92	fprintf(ofp, " record [-m <SIZE>] [-s <NAME>] [-n <NAME>] [<URL> \| -C <URL> -D <URL>]\n");
	93	fprintf(ofp, " Snapshot a session's buffer(s) for all domains. If an URL is\n");
	94	fprintf(ofp, " specified, it is used instead of a previously added output.\n");
e0dcb8bf DG	95	fprintf(ofp, " Specifying only a name or/a size will override the current output value.\n");
	96	fprintf(ofp, " For instance, you can record a snapshot with a custom maximum size\n");
	97	fprintf(ofp, " or with a different name.\n");
57f272ed DG	98	fprintf(ofp, "\n");
	99	fprintf(ofp, "Options:\n");
	100	fprintf(ofp, " -h, --help Show this help\n");
	101	fprintf(ofp, " --list-options Simple listing of options\n");
	102	fprintf(ofp, " -s, --session NAME Apply to session name\n");
	103	fprintf(ofp, " -n, --name NAME Name of the output or snapshot\n");
a8f307d8	104	fprintf(ofp, " -m, --max-size SIZE Maximum bytes size of the snapshot {+k,+M,+G}\n");
57f272ed DG	105	fprintf(ofp, " -C, --ctrl-url URL Set control path URL. (Must use -D also)\n");
	106	fprintf(ofp, " -D, --data-url URL Set data path URL. (Must use -C also)\n");
	107	fprintf(ofp, "\n");
	108	}
	109
	110	/*
	111	* Count and return the number of arguments in argv.
	112	*/
	113	static int count_arguments(const char **argv)
	114	{
	115	int i = 0;
	116
	117	assert(argv);
	118
	119	while (argv[i] != NULL) {
	120	i++;
	121	}
	122
	123	return i;
	124	}
	125
	126	/*
	127	* Create a snapshot output object from arguments using the given URL.
	128	*
	129	* Return a newly allocated object or NULL on error.
	130	*/
	131	static struct lttng_snapshot_output create_output_from_args(const char url)
	132	{
	133	int ret = 0;
	134	struct lttng_snapshot_output *output = NULL;
	135
	136	output = lttng_snapshot_output_create();
	137	if (!output) {
	138	goto error_create;
	139	}
	140
	141	if (url) {
	142	ret = lttng_snapshot_output_set_ctrl_url(url, output);
	143	if (ret < 0) {
	144	goto error;
	145	}
	146	} else if (opt_ctrl_url) {
	147	ret = lttng_snapshot_output_set_ctrl_url(opt_ctrl_url, output);
	148	if (ret < 0) {
	149	goto error;
	150	}
	151	}
	152
	153	if (opt_data_url) {
	154	ret = lttng_snapshot_output_set_data_url(opt_data_url, output);
	155	if (ret < 0) {
	156	goto error;
	157	}
	158	}
	159
	160	if (opt_max_size) {
	161	ret = lttng_snapshot_output_set_size(opt_max_size, output);
	162	if (ret < 0) {
	163	goto error;
	164	}
	165	}
	166
	167	if (opt_output_name) {
	168	ret = lttng_snapshot_output_set_name(opt_output_name, output);
169	if (ret < 0) {
170	goto error;
171	}
172	}
173
174	return output;
175
176	error:
177	lttng_snapshot_output_destroy(output);
178	error_create:
179	return NULL;
180	}
181
182	static int list_output(void)
183	{
184	int ret, output_seen = 0;
185	struct lttng_snapshot_output *s_iter;
186	struct lttng_snapshot_output_list *list;
187
188	ret = lttng_snapshot_list_output(current_session_name, &list);
189	if (ret < 0) {
190	goto error;
191	}
192
193	MSG("Snapshot output list for session %s", current_session_name);
194
195	while ((s_iter = lttng_snapshot_output_list_get_next(list)) != NULL) {
196	MSG("%s[%" PRIu32 "] %s: %s", indent4,
197	lttng_snapshot_output_get_id(s_iter),
198	lttng_snapshot_output_get_name(s_iter),
199	lttng_snapshot_output_get_ctrl_url(s_iter));
200	output_seen = 1;
201	}
202
203	lttng_snapshot_output_list_destroy(list);
204
205	if (!output_seen) {
206	MSG("%sNone", indent4);
207	}
208
209	error:
210	return ret;
211	}
212
213	/*
214	* Delete output by ID.
215	*/
eb240553	216	static int del_output(uint32_t id, const char *name)
57f272ed DG	217	{
	218	int ret;
	219	struct lttng_snapshot_output *output = NULL;
	220
	221	output = lttng_snapshot_output_create();
	222	if (!output) {
	223	ret = CMD_FATAL;
	224	goto error;
	225	}
	226
eb240553 DG	227	if (name) {
	228	ret = lttng_snapshot_output_set_name(name, output);
	229	} else if (id != UINT32_MAX) {
	230	ret = lttng_snapshot_output_set_id(id, output);
	231	} else {
	232	ret = CMD_ERROR;
	233	goto error;
	234	}
57f272ed DG	235	if (ret < 0) {
	236	ret = CMD_FATAL;
	237	goto error;
	238	}
	239
	240	ret = lttng_snapshot_del_output(current_session_name, output);
	241	if (ret < 0) {
	242	goto error;
	243	}
	244
eb240553 DG	245	if (id != UINT32_MAX) {
	246	MSG("Snapshot output id %" PRIu32 " successfully deleted for session %s",
	247	id, current_session_name);
	248	} else {
	249	MSG("Snapshot output %s successfully deleted for session %s",
	250	name, current_session_name);
	251	}
57f272ed DG	252
	253	error:
	254	lttng_snapshot_output_destroy(output);
	255	return ret;
	256	}
	257
	258	/*
	259	* Add output from the user URL.
	260	*/
	261	static int add_output(const char *url)
	262	{
	263	int ret;
	264	struct lttng_snapshot_output *output = NULL;
	265
	266	if (!url && (!opt_data_url \|\| !opt_ctrl_url)) {
	267	ret = CMD_ERROR;
	268	goto error;
	269	}
	270
	271	output = create_output_from_args(url);
	272	if (!output) {
	273	ret = CMD_FATAL;
	274	goto error;
	275	}
	276
	277	/* This call, if successful, populates the id of the output object. */
	278	ret = lttng_snapshot_add_output(current_session_name, output);
	279	if (ret < 0) {
	280	goto error;
	281	}
	282
	283	MSG("Snapshot output successfully added for session %s",
	284	current_session_name);
	285	MSG(" [%" PRIu32 "] %s: %s (max-size: %" PRId64 ")",
	286	lttng_snapshot_output_get_id(output),
	287	lttng_snapshot_output_get_name(output),
	288	lttng_snapshot_output_get_ctrl_url(output),
	289	lttng_snapshot_output_get_maxsize(output));
	290	error:
	291	lttng_snapshot_output_destroy(output);
	292	return ret;
	293	}
	294
	295	static int cmd_add_output(int argc, const char **argv)
	296	{
	297	int ret = CMD_SUCCESS;
	298
	299	if (argc < 2 && (!opt_data_url \|\| !opt_ctrl_url)) {
	300	usage(stderr);
	301	ret = CMD_ERROR;
	302	goto end;
	303	}
	304
	305	ret = add_output(argv[1]);
	306
	307	end:
	308	return ret;
	309	}
	310
	311	static int cmd_del_output(int argc, const char **argv)
	312	{
	313	int ret = CMD_SUCCESS;
eb240553 DG	314	char *name;
eb240553 DG	315	long id;
57f272ed DG	316
	317	if (argc < 2) {
	318	usage(stderr);
	319	ret = CMD_ERROR;
	320	goto end;
	321	}
	322
eb240553 DG	323	errno = 0;
	324	id = strtol(argv[1], &name, 10);
	325	if (id == 0 && errno == 0) {
	326	ret = del_output(UINT32_MAX, name);
	327	} else if (errno == 0 && *name == '\0') {
	328	ret = del_output(id, NULL);
	329	} else {
	330	ERR("Argument %s not recognized", argv[1]);
	331	ret = -1;
	332	goto end;
	333	}
57f272ed DG	334
	335	end:
	336	return ret;
	337	}
	338
	339	static int cmd_list_output(int argc, const char **argv)
	340	{
	341	return list_output();
	342	}
	343
	344	/*
	345	* Do a snapshot record with the URL if one is given.
	346	*/
	347	static int record(const char *url)
	348	{
	349	int ret;
	350	struct lttng_snapshot_output *output = NULL;
	351
e1986656 DG	352	output = create_output_from_args(url);
	353	if (!output) {
	354	ret = CMD_FATAL;
	355	goto error;
57f272ed DG	356	}
	357
	358	ret = lttng_snapshot_record(current_session_name, output, 0);
	359	if (ret < 0) {
	360	goto error;
	361	}
	362
	363	MSG("Snapshot recorded successfully for session %s", current_session_name);
	364
	365	if (url) {
	366	MSG("Snapshot written at: %s", url);
	367	} else if (opt_ctrl_url) {
	368	MSG("Snapshot written to ctrl: %s, data: %s", opt_ctrl_url,
	369	opt_data_url);
57f272ed DG	370	}
	371
	372	error:
cdcdb9dd	373	lttng_snapshot_output_destroy(output);
57f272ed DG	374	return ret;
	375	}
	376
	377	static int cmd_record(int argc, const char **argv)
	378	{
	379	int ret;
	380
	381	if (argc == 2) {
	382	/* With a given URL */
	383	ret = record(argv[1]);
	384	} else {
	385	ret = record(NULL);
	386	}
	387
	388	return ret;
	389	}
	390
	391	static int handle_command(const char **argv)
	392	{
	393	int ret, i = 0, argc;
	394	struct cmd_struct *cmd;
	395
	396	if (argv == NULL \|\| (!opt_ctrl_url && opt_data_url) \|\|
	397	(opt_ctrl_url && !opt_data_url)) {
	398	usage(stderr);
	399	ret = CMD_ERROR;
	400	goto end;
	401	}
	402
	403	argc = count_arguments(argv);
	404
	405	cmd = &actions[i];
	406	while (cmd->func != NULL) {
	407	/* Find command */
	408	if (strcmp(argv[0], cmd->name) == 0) {
	409	ret = cmd->func(argc, argv);
	410	goto end;
	411	}
	412	i++;
	413	cmd = &actions[i];
	414	}
	415
	416	/* Command not found */
	417	ret = CMD_UNDEFINED;
	418
	419	end:
	420	return ret;
	421	}
	422
	423	/*
	424	* The 'snapshot <cmd> <options>' first level command
	425	*/
	426	int cmd_snapshot(int argc, const char **argv)
	427	{
	428	int opt, ret = CMD_SUCCESS;
	429	char *session_name = NULL;
	430	static poptContext pc;
	431
	432	pc = poptGetContext(NULL, argc, argv, snapshot_opts, 0);
	433	poptReadDefaultConfig(pc, 0);
	434
	435	while ((opt = poptGetNextOpt(pc)) != -1) {
	436	switch (opt) {
	437	case OPT_HELP:
438	usage(stdout);
439	goto end;
440	case OPT_LIST_OPTIONS:
441	list_cmd_options(stdout, snapshot_opts);
442	goto end;
443	case OPT_MAX_SIZE:
444	{
a8f307d8	445	uint64_t val;
57f272ed DG	446	const char *opt = poptGetOptArg(pc);
57f272ed DG	447
a8f307d8	448	if (utils_parse_size_suffix((char *) opt, &val) < 0) {
57f272ed DG	449	ERR("Unable to handle max-size value %s", opt);
	450	ret = CMD_ERROR;
	451	goto end;
	452	}
	453
57f272ed DG	454	opt_max_size = val;
	455
	456	break;
	457	}
	458	default:
	459	usage(stderr);
	460	ret = CMD_UNDEFINED;
	461	goto end;
	462	}
	463	}
	464
	465	if (!opt_session_name) {
	466	session_name = get_session_name();
	467	if (session_name == NULL) {
	468	ret = CMD_ERROR;
	469	goto end;
	470	}
	471	current_session_name = session_name;
	472	} else {
	473	current_session_name = opt_session_name;
	474	}
	475
	476	ret = handle_command(poptGetArgs(pc));
	477	if (ret < 0) {
6dc3064a DG	478	if (ret == -LTTNG_ERR_EPERM) {
	479	ERR("The session needs to be set in no output mode (--no-output)");
	480	}
57f272ed DG	481	ERR("%s", lttng_strerror(ret));
	482	goto end;
	483	}
	484
	485	end:
	486	if (!opt_session_name) {
	487	free(session_name);
	488	}
	489	poptFreeContext(pc);
	490	return ret;
	491	}