[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 <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_DOUBLE, 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\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:
		{
			long long int val;
			char *endptr;
			const char *opt = poptGetOptArg(pc);

			/* Documented by the man page of strtoll(3). */
			errno = 0;
			val = strtoll(opt, &endptr, 10);
			if ((errno == ERANGE && (val == LLONG_MAX || val == LONG_MIN))
					|| (errno != 0 && val == 0)) {
				ERR("Unable to handle max-size value %s", opt);
				ret = CMD_ERROR;
				goto end;
			}

			if (endptr == opt) {
				ERR("No digits were found in %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
	29	#include <lttng/snapshot.h>
	30
	31	#include "../command.h"
	32
	33	static const char *opt_session_name;
	34	static const char *opt_output_name;
	35	static const char *opt_data_url;
	36	static const char *opt_ctrl_url;
	37	static const char *current_session_name;
	38	static uint64_t opt_max_size;
	39
	40	/* Stub for the cmd struct actions. */
	41	static int cmd_add_output(int argc, const char **argv);
	42	static int cmd_del_output(int argc, const char **argv);
	43	static int cmd_list_output(int argc, const char **argv);
	44	static int cmd_record(int argc, const char **argv);
	45
	46	static const char *indent4 = " ";
	47
	48	enum {
	49	OPT_HELP = 1,
	50	OPT_LIST_OPTIONS,
	51	OPT_MAX_SIZE,
	52	};
	53
	54	static struct poptOption snapshot_opts[] = {
	55	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	56	{"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
	57	{"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
	58	{"ctrl-url", 'C', POPT_ARG_STRING, &opt_ctrl_url, 0, 0, 0},
	59	{"data-url", 'D', POPT_ARG_STRING, &opt_data_url, 0, 0, 0},
	60	{"name", 'n', POPT_ARG_STRING, &opt_output_name, 0, 0, 0},
	61	{"max-size", 'm', POPT_ARG_DOUBLE, 0, OPT_MAX_SIZE, 0, 0},
	62	{"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
	63	{0, 0, 0, 0, 0, 0, 0}
	64	};
65
66	static struct cmd_struct actions[] = {
67	{ "add-output", cmd_add_output },
68	{ "del-output", cmd_del_output },
69	{ "list-output", cmd_list_output },
70	{ "record", cmd_record },
71	{ NULL, NULL } /* Array closure */
72	};
73
74	/*
75	* usage
76	*/
77	static void usage(FILE *ofp)
78	{
8df3bfe9	79	fprintf(ofp, "usage: lttng snapshot [OPTION] ACTION\n");
57f272ed DG	80	fprintf(ofp, "\n");
	81	fprintf(ofp, "Actions:\n");
	82	fprintf(ofp, " add-output [-m <SIZE>] [-s <NAME>] [-n <NAME>] <URL> \| -C <URL> -D <URL>\n");
	83	fprintf(ofp, " Setup and add an snapshot output for a session.\n");
	84	fprintf(ofp, "\n");
e0dcb8bf	85	fprintf(ofp, " del-output ID \| NAME [-s <NAME>]\n");
57f272ed DG	86	fprintf(ofp, " Delete an output for a session using the ID.\n");
	87	fprintf(ofp, "\n");
	88	fprintf(ofp, " list-output [-s <NAME>]\n");
	89	fprintf(ofp, " List the output of a session.\n");
	90	fprintf(ofp, "\n");
	91	fprintf(ofp, " record [-m <SIZE>] [-s <NAME>] [-n <NAME>] [<URL> \| -C <URL> -D <URL>]\n");
	92	fprintf(ofp, " Snapshot a session's buffer(s) for all domains. If an URL is\n");
	93	fprintf(ofp, " specified, it is used instead of a previously added output.\n");
e0dcb8bf DG	94	fprintf(ofp, " Specifying only a name or/a size will override the current output value.\n");
	95	fprintf(ofp, " For instance, you can record a snapshot with a custom maximum size\n");
	96	fprintf(ofp, " or with a different name.\n");
57f272ed DG	97	fprintf(ofp, "\n");
	98	fprintf(ofp, "Options:\n");
	99	fprintf(ofp, " -h, --help Show this help\n");
	100	fprintf(ofp, " --list-options Simple listing of options\n");
	101	fprintf(ofp, " -s, --session NAME Apply to session name\n");
	102	fprintf(ofp, " -n, --name NAME Name of the output or snapshot\n");
	103	fprintf(ofp, " -m, --max-size SIZE Maximum bytes size of the snapshot\n");
	104	fprintf(ofp, " -C, --ctrl-url URL Set control path URL. (Must use -D also)\n");
	105	fprintf(ofp, " -D, --data-url URL Set data path URL. (Must use -C also)\n");
	106	fprintf(ofp, "\n");
	107	}
	108
	109	/*
	110	* Count and return the number of arguments in argv.
	111	*/
	112	static int count_arguments(const char **argv)
	113	{
	114	int i = 0;
	115
	116	assert(argv);
	117
	118	while (argv[i] != NULL) {
	119	i++;
	120	}
	121
	122	return i;
	123	}
	124
	125	/*
	126	* Create a snapshot output object from arguments using the given URL.
	127	*
	128	* Return a newly allocated object or NULL on error.
	129	*/
	130	static struct lttng_snapshot_output create_output_from_args(const char url)
	131	{
	132	int ret = 0;
	133	struct lttng_snapshot_output *output = NULL;
	134
	135	output = lttng_snapshot_output_create();
	136	if (!output) {
	137	goto error_create;
	138	}
	139
	140	if (url) {
	141	ret = lttng_snapshot_output_set_ctrl_url(url, output);
	142	if (ret < 0) {
	143	goto error;
	144	}
	145	} else if (opt_ctrl_url) {
	146	ret = lttng_snapshot_output_set_ctrl_url(opt_ctrl_url, output);
	147	if (ret < 0) {
	148	goto error;
	149	}
	150	}
	151
	152	if (opt_data_url) {
	153	ret = lttng_snapshot_output_set_data_url(opt_data_url, output);
	154	if (ret < 0) {
	155	goto error;
	156	}
	157	}
	158
	159	if (opt_max_size) {
	160	ret = lttng_snapshot_output_set_size(opt_max_size, output);
161	if (ret < 0) {
162	goto error;
163	}
164	}
165
166	if (opt_output_name) {
167	ret = lttng_snapshot_output_set_name(opt_output_name, output);
168	if (ret < 0) {
169	goto error;
170	}
171	}
172
173	return output;
174
175	error:
176	lttng_snapshot_output_destroy(output);
177	error_create:
178	return NULL;
179	}
180
181	static int list_output(void)
182	{
183	int ret, output_seen = 0;
184	struct lttng_snapshot_output *s_iter;
185	struct lttng_snapshot_output_list *list;
186
187	ret = lttng_snapshot_list_output(current_session_name, &list);
188	if (ret < 0) {
189	goto error;
190	}
191
192	MSG("Snapshot output list for session %s", current_session_name);
193
194	while ((s_iter = lttng_snapshot_output_list_get_next(list)) != NULL) {
195	MSG("%s[%" PRIu32 "] %s: %s", indent4,
196	lttng_snapshot_output_get_id(s_iter),
197	lttng_snapshot_output_get_name(s_iter),
198	lttng_snapshot_output_get_ctrl_url(s_iter));
199	output_seen = 1;
200	}
201
202	lttng_snapshot_output_list_destroy(list);
203
204	if (!output_seen) {
205	MSG("%sNone", indent4);
206	}
207
208	error:
209	return ret;
210	}
211
212	/*
213	* Delete output by ID.
214	*/
eb240553	215	static int del_output(uint32_t id, const char *name)
57f272ed DG	216	{
	217	int ret;
	218	struct lttng_snapshot_output *output = NULL;
	219
	220	output = lttng_snapshot_output_create();
	221	if (!output) {
	222	ret = CMD_FATAL;
	223	goto error;
	224	}
	225
eb240553 DG	226	if (name) {
	227	ret = lttng_snapshot_output_set_name(name, output);
	228	} else if (id != UINT32_MAX) {
	229	ret = lttng_snapshot_output_set_id(id, output);
	230	} else {
	231	ret = CMD_ERROR;
	232	goto error;
	233	}
57f272ed DG	234	if (ret < 0) {
	235	ret = CMD_FATAL;
	236	goto error;
	237	}
	238
	239	ret = lttng_snapshot_del_output(current_session_name, output);
	240	if (ret < 0) {
	241	goto error;
	242	}
	243
eb240553 DG	244	if (id != UINT32_MAX) {
	245	MSG("Snapshot output id %" PRIu32 " successfully deleted for session %s",
	246	id, current_session_name);
	247	} else {
	248	MSG("Snapshot output %s successfully deleted for session %s",
	249	name, current_session_name);
	250	}
57f272ed DG	251
	252	error:
	253	lttng_snapshot_output_destroy(output);
	254	return ret;
	255	}
	256
	257	/*
	258	* Add output from the user URL.
	259	*/
	260	static int add_output(const char *url)
	261	{
	262	int ret;
	263	struct lttng_snapshot_output *output = NULL;
	264
	265	if (!url && (!opt_data_url \|\| !opt_ctrl_url)) {
	266	ret = CMD_ERROR;
	267	goto error;
	268	}
	269
	270	output = create_output_from_args(url);
	271	if (!output) {
	272	ret = CMD_FATAL;
	273	goto error;
	274	}
	275
	276	/* This call, if successful, populates the id of the output object. */
	277	ret = lttng_snapshot_add_output(current_session_name, output);
	278	if (ret < 0) {
	279	goto error;
	280	}
	281
	282	MSG("Snapshot output successfully added for session %s",
	283	current_session_name);
	284	MSG(" [%" PRIu32 "] %s: %s (max-size: %" PRId64 ")",
	285	lttng_snapshot_output_get_id(output),
	286	lttng_snapshot_output_get_name(output),
	287	lttng_snapshot_output_get_ctrl_url(output),
	288	lttng_snapshot_output_get_maxsize(output));
	289	error:
	290	lttng_snapshot_output_destroy(output);
	291	return ret;
	292	}
	293
	294	static int cmd_add_output(int argc, const char **argv)
	295	{
	296	int ret = CMD_SUCCESS;
	297
	298	if (argc < 2 && (!opt_data_url \|\| !opt_ctrl_url)) {
	299	usage(stderr);
	300	ret = CMD_ERROR;
	301	goto end;
	302	}
	303
	304	ret = add_output(argv[1]);
	305
	306	end:
	307	return ret;
	308	}
	309
	310	static int cmd_del_output(int argc, const char **argv)
	311	{
	312	int ret = CMD_SUCCESS;
eb240553 DG	313	char *name;
eb240553 DG	314	long id;
57f272ed DG	315
	316	if (argc < 2) {
	317	usage(stderr);
	318	ret = CMD_ERROR;
	319	goto end;
	320	}
	321
eb240553 DG	322	errno = 0;
	323	id = strtol(argv[1], &name, 10);
	324	if (id == 0 && errno == 0) {
	325	ret = del_output(UINT32_MAX, name);
	326	} else if (errno == 0 && *name == '\0') {
	327	ret = del_output(id, NULL);
	328	} else {
	329	ERR("Argument %s not recognized", argv[1]);
	330	ret = -1;
	331	goto end;
	332	}
57f272ed DG	333
	334	end:
	335	return ret;
	336	}
	337
	338	static int cmd_list_output(int argc, const char **argv)
	339	{
	340	return list_output();
	341	}
	342
	343	/*
	344	* Do a snapshot record with the URL if one is given.
	345	*/
	346	static int record(const char *url)
	347	{
	348	int ret;
	349	struct lttng_snapshot_output *output = NULL;
	350
e1986656 DG	351	output = create_output_from_args(url);
	352	if (!output) {
	353	ret = CMD_FATAL;
	354	goto error;
57f272ed DG	355	}
	356
	357	ret = lttng_snapshot_record(current_session_name, output, 0);
	358	if (ret < 0) {
	359	goto error;
	360	}
	361
	362	MSG("Snapshot recorded successfully for session %s", current_session_name);
	363
	364	if (url) {
	365	MSG("Snapshot written at: %s", url);
	366	} else if (opt_ctrl_url) {
	367	MSG("Snapshot written to ctrl: %s, data: %s", opt_ctrl_url,
	368	opt_data_url);
57f272ed DG	369	}
	370
	371	error:
cdcdb9dd	372	lttng_snapshot_output_destroy(output);
57f272ed DG	373	return ret;
	374	}
	375
	376	static int cmd_record(int argc, const char **argv)
	377	{
	378	int ret;
	379
	380	if (argc == 2) {
	381	/* With a given URL */
	382	ret = record(argv[1]);
	383	} else {
	384	ret = record(NULL);
	385	}
	386
	387	return ret;
	388	}
	389
	390	static int handle_command(const char **argv)
	391	{
	392	int ret, i = 0, argc;
	393	struct cmd_struct *cmd;
	394
	395	if (argv == NULL \|\| (!opt_ctrl_url && opt_data_url) \|\|
	396	(opt_ctrl_url && !opt_data_url)) {
	397	usage(stderr);
	398	ret = CMD_ERROR;
	399	goto end;
	400	}
	401
	402	argc = count_arguments(argv);
	403
	404	cmd = &actions[i];
	405	while (cmd->func != NULL) {
	406	/* Find command */
	407	if (strcmp(argv[0], cmd->name) == 0) {
	408	ret = cmd->func(argc, argv);
	409	goto end;
	410	}
	411	i++;
	412	cmd = &actions[i];
	413	}
	414
	415	/* Command not found */
	416	ret = CMD_UNDEFINED;
	417
	418	end:
	419	return ret;
	420	}
	421
	422	/*
	423	* The 'snapshot <cmd> <options>' first level command
	424	*/
	425	int cmd_snapshot(int argc, const char **argv)
	426	{
	427	int opt, ret = CMD_SUCCESS;
	428	char *session_name = NULL;
	429	static poptContext pc;
	430
	431	pc = poptGetContext(NULL, argc, argv, snapshot_opts, 0);
	432	poptReadDefaultConfig(pc, 0);
	433
	434	while ((opt = poptGetNextOpt(pc)) != -1) {
	435	switch (opt) {
	436	case OPT_HELP:
437	usage(stdout);
438	goto end;
439	case OPT_LIST_OPTIONS:
440	list_cmd_options(stdout, snapshot_opts);
441	goto end;
442	case OPT_MAX_SIZE:
443	{
444	long long int val;
445	char *endptr;
446	const char *opt = poptGetOptArg(pc);
447
e1986656 DG	448	/* Documented by the man page of strtoll(3). */
e1986656 DG	449	errno = 0;
57f272ed DG	450	val = strtoll(opt, &endptr, 10);
	451	if ((errno == ERANGE && (val == LLONG_MAX \|\| val == LONG_MIN))
	452	\|\| (errno != 0 && val == 0)) {
	453	ERR("Unable to handle max-size value %s", opt);
	454	ret = CMD_ERROR;
	455	goto end;
	456	}
	457
	458	if (endptr == opt) {
	459	ERR("No digits were found in %s", opt);
	460	ret = CMD_ERROR;
	461	goto end;
	462	}
	463	opt_max_size = val;
	464
	465	break;
	466	}
	467	default:
	468	usage(stderr);
	469	ret = CMD_UNDEFINED;
	470	goto end;
	471	}
	472	}
	473
	474	if (!opt_session_name) {
	475	session_name = get_session_name();
	476	if (session_name == NULL) {
	477	ret = CMD_ERROR;
	478	goto end;
	479	}
	480	current_session_name = session_name;
	481	} else {
	482	current_session_name = opt_session_name;
	483	}
	484
	485	ret = handle_command(poptGetArgs(pc));
	486	if (ret < 0) {
6dc3064a DG	487	if (ret == -LTTNG_ERR_EPERM) {
	488	ERR("The session needs to be set in no output mode (--no-output)");
	489	}
57f272ed DG	490	ERR("%s", lttng_strerror(ret));
	491	goto end;
	492	}
	493
	494	end:
	495	if (!opt_session_name) {
	496	free(session_name);
	497	}
	498	poptFreeContext(pc);
	499	return ret;
	500	}