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

/*
 * Copyright (C) 2011 - 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 <popt.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <unistd.h>

#include "../command.h"

static char *opt_session_name;
static char *opt_viewer;
static char *opt_trace_path;
static const char *babeltrace_bin = CONFIG_BABELTRACE_BIN;

#ifdef LTTNG_EMBED_HELP
static const char help_msg[] =
#include <lttng-view.1.h>
;
#endif

enum {
	OPT_HELP = 1,
	OPT_LIST_OPTIONS,
};

static struct poptOption long_options[] = {
	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	{"help",        'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
	{"list-options", 0,  POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
	{"viewer",      'e', POPT_ARG_STRING, &opt_viewer, 0, 0, 0},
	{"trace-path",  't', POPT_ARG_STRING, &opt_trace_path, 0, 0, 0},
	{0, 0, 0, 0, 0, 0, 0}
};

/*
 * This is needed for each viewer since we are using execvp().
 */
static const char *babeltrace_opts[] = { "babeltrace" };

/*
 * Type is also use as the index in the viewers array. So please, make sure
 * your enum value is in the right order in the array below.
 */
enum viewer_type {
	VIEWER_BABELTRACE    = 0,
	VIEWER_USER_DEFINED  = 1,
};

/*
 * NOTE: "lttv" is a shell command and it's not working for exec() family
 * functions so we might think of removing this wrapper or using bash.
 */
static const struct viewers {
	const char *exec_name;
	enum viewer_type type;
} viewers[] = {
	{ "babeltrace", VIEWER_BABELTRACE },
	{ NULL, VIEWER_USER_DEFINED },
};

/* Is the session we are trying to view is in live mode. */
static int session_live_mode;

static const struct viewers *parse_options(void)
{
	if (opt_viewer == NULL) {
		/* Default is babeltrace */
		return &(viewers[VIEWER_BABELTRACE]);
	}

	/*
	 * This means that if -e, --viewers is used, we just override everything
	 * with it. For supported viewers like lttv, we could simply detect if "-t"
	 * is passed and if not, add the trace directory to it.
	 */
	return &(viewers[VIEWER_USER_DEFINED]);
}

/*
 * Alloc an array of string pointer from a simple string having all options
 * seperated by spaces. Also adds the trace path to the arguments.
 *
 * The returning pointer is ready to be passed to execvp().
 */
static char **alloc_argv_from_user_opts(char *opts, const char *trace_path)
{
	int i = 0, ignore_space = 0;
	unsigned int num_opts = 1;
	char **argv, *token = opts;

	/* Count number of arguments. */
	do {
		if (*token == ' ') {
			/* Use to ignore consecutive spaces */
			if (!ignore_space) {
				num_opts++;
			}
			ignore_space = 1;
		} else {
			ignore_space = 0;
		}
		token++;
	} while (*token != '\0');

	/* Add two here for the NULL terminating element and trace path */
	argv = zmalloc(sizeof(char *) * (num_opts + 2));
	if (argv == NULL) {
		goto error;
	}

	token = strtok(opts, " ");
	while (token != NULL) {
		argv[i] = strdup(token);
		if (argv[i] == NULL) {
			goto error;
		}
		token = strtok(NULL, " ");
		i++;
	}

	argv[num_opts] = (char *) trace_path;
	argv[num_opts + 1] = NULL;

	return argv;

error:
	if (argv) {
		for (i = 0; i < num_opts + 2; i++) {
			free(argv[i]);
		}
		free(argv);
	}

	return NULL;
}

/*
 * Alloc an array of string pointer from an array of strings. It also adds
 * the trace path to the argv.
 *
 * The returning pointer is ready to be passed to execvp().
 */
static char **alloc_argv_from_local_opts(const char **opts, size_t opts_len,
		const char *trace_path)
{
	char **argv;
	size_t size, mem_len;


	/* Add one for the NULL terminating element. */
	mem_len = opts_len + 1;
	if (session_live_mode) {
		/* Add 3 option for the live mode being "-i lttng-live URL". */
		mem_len += 3;
	} else {
		/* Add option for the trace path. */
		mem_len += 1;
	}

	size = sizeof(char *) * mem_len;

	/* Add two here for the trace_path and the NULL terminating element. */
	argv = zmalloc(size);
	if (argv == NULL) {
		goto error;
	}

	memcpy(argv, opts, sizeof(char *) * opts_len);

	if (session_live_mode) {
		argv[opts_len] = "-i";
		argv[opts_len + 1] = "lttng-live";
		argv[opts_len + 2] = (char *) trace_path;
		argv[opts_len + 3] = NULL;
	} else {
		argv[opts_len] = (char *) trace_path;
		argv[opts_len + 1] = NULL;
	}

error:
	return argv;
}

/*
 * Spawn viewer with the trace directory path.
 */
static int spawn_viewer(const char *trace_path)
{
	int ret = 0;
	struct stat status;
	const char *viewer_bin = NULL;
	const struct viewers *viewer;
	char **argv = NULL;

	/* Check for --viewer options */
	viewer = parse_options();
	if (viewer == NULL) {
		ret = CMD_ERROR;
		goto error;
	}

	switch (viewer->type) {
	case VIEWER_BABELTRACE:
		if (stat(babeltrace_bin, &status) == 0) {
			viewer_bin = babeltrace_bin;
		} else {
			viewer_bin = viewer->exec_name;
		}
		argv = alloc_argv_from_local_opts(babeltrace_opts,
				ARRAY_SIZE(babeltrace_opts), trace_path);
		break;
	case VIEWER_USER_DEFINED:
		argv = alloc_argv_from_user_opts(opt_viewer, trace_path);
		if (argv) {
			viewer_bin = argv[0];
		}
		break;
	default:
		viewer_bin = viewers[VIEWER_BABELTRACE].exec_name;
		argv = alloc_argv_from_local_opts(babeltrace_opts,
				ARRAY_SIZE(babeltrace_opts), trace_path);
		break;
	}

	if (argv == NULL || !viewer_bin) {
		ret = CMD_FATAL;
		goto error;
	}

	DBG("Using %s viewer", viewer_bin);

	ret = execvp(viewer_bin, argv);
	if (ret) {
		if (errno == ENOENT) {
			ERR("%s not found on the system", viewer_bin);
		} else {
			PERROR("exec: %s", viewer_bin);
		}
		ret = CMD_FATAL;
		goto error;
	}

error:
	free(argv);
	return ret;
}

/*
 * Build the live path we need for the lttng live view.
 */
static char *build_live_path(char *session_name)
{
	int ret;
	char *path = NULL;
	char hostname[HOST_NAME_MAX];

	ret = gethostname(hostname, sizeof(hostname));
	if (ret < 0) {
		PERROR("gethostname");
		goto error;
	}

	ret = asprintf(&path, "net://localhost/host/%s/%s", hostname,
			session_name);
	if (ret < 0) {
		PERROR("asprintf live path");
		goto error;
	}

error:
	return path;
}

/*
 * Exec viewer if found and use session name path.
 */
static int view_trace(void)
{
	int ret;
	char *session_name, *trace_path = NULL;
	struct lttng_session *sessions = NULL;
	bool free_trace_path = false;

	/*
	 * Safety net. If lttng is suid at some point for *any* useless reasons,
	 * this prevent any bad execution of binaries.
	 */
	if (getuid() != 0) {
		if (getuid() != geteuid()) {
			ERR("UID does not match effective UID.");
			ret = CMD_ERROR;
			goto error;
		} else if (getgid() != getegid()) {
			ERR("GID does not match effective GID.");
			ret = CMD_ERROR;
			goto error;
		}
	}

	/* User define trace path override the session name */
	if (opt_trace_path) {
		session_name = NULL;
	} else if(opt_session_name == NULL) {
		session_name = get_session_name();
		if (session_name == NULL) {
			ret = CMD_ERROR;
			goto error;
		}
	} else {
		session_name = opt_session_name;
	}

	DBG("Viewing trace for session %s", session_name);

	if (session_name) {
		int i, count, found = 0;

		/* Getting all sessions */
		count = lttng_list_sessions(&sessions);
		if (count < 0) {
			ERR("Unable to list sessions. Session name %s not found.",
					session_name);
			MSG("Is there a session daemon running?");
			ret = CMD_ERROR;
			goto free_error;
		}

		/* Find our session listed by the session daemon */
		for (i = 0; i < count; i++) {
			if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
				found = 1;
				break;
			}
		}

		if (!found) {
			MSG("Session name %s not found", session_name);
			ret = CMD_ERROR;
			goto free_sessions;
		}

		session_live_mode = sessions[i].live_timer_interval;

		DBG("Session live mode set to %d", session_live_mode);

		if (sessions[i].enabled && !session_live_mode) {
			WARN("Session %s is running. Please stop it before reading it.",
					session_name);
			ret = CMD_ERROR;
			goto free_sessions;
		}

		/* If the timer interval is set we are in live mode. */
		if (session_live_mode) {
			trace_path = build_live_path(session_name);
			if (!trace_path) {
				ret = CMD_ERROR;
				goto free_sessions;
			}
			free_trace_path = true;
		} else {
			/* Get file system session path. */
			trace_path = sessions[i].path;
		}
	} else {
		trace_path = opt_trace_path;
	}

	MSG("Trace directory: %s\n", trace_path);

	ret = spawn_viewer(trace_path);
	if (ret < 0) {
		/* Don't set ret so lttng can interpret the sessiond error. */
		goto free_sessions;
	}

free_sessions:
	if (session_live_mode && free_trace_path) {
		free(trace_path);
	}
	free(sessions);
free_error:
	if (opt_session_name == NULL) {
		free(session_name);
	}
error:
	return ret;
}

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

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

	if (lttng_opt_mi) {
		WARN("mi does not apply to view command");
	}

	while ((opt = poptGetNextOpt(pc)) != -1) {
		switch (opt) {
		case OPT_HELP:
			SHOW_HELP();
			goto end;
		case OPT_LIST_OPTIONS:
			list_cmd_options(stdout, long_options);
			goto end;
		default:
			ret = CMD_UNDEFINED;
			goto end;
		}
	}

	opt_session_name = (char*) poptGetArg(pc);

	leftover = poptGetArg(pc);
	if (leftover) {
		ERR("Unknown argument: %s", leftover);
		ret = CMD_ERROR;
		goto end;
	}

	ret = view_trace();

end:
	poptFreeContext(pc);
	return ret;
}
Commit	Line	Data
0c95f5b2 DG	1	/*
	2	* Copyright (C) 2011 - David Goulet <dgoulet@efficios.com>
	3	*
d14d33bf AM	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License, version 2 only,
	6	* as published by the Free Software Foundation.
0c95f5b2	7	*
d14d33bf AM	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
0c95f5b2	12	*
d14d33bf AM	13	* You should have received a copy of the GNU General Public License along
	14	* with this program; if not, write to the Free Software Foundation, Inc.,
	15	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
0c95f5b2 DG	16	*/
0c95f5b2 DG	17
6c1c0768	18	#define _LGPL_SOURCE
0c95f5b2 DG	19	#include <popt.h>
	20	#include <stdio.h>
	21	#include <stdlib.h>
	22	#include <string.h>
	23	#include <sys/stat.h>
	24	#include <sys/types.h>
	25	#include <unistd.h>
	26
	27	#include "../command.h"
0c95f5b2 DG	28
	29	static char *opt_session_name;
	30	static char *opt_viewer;
f1f887c0	31	static char *opt_trace_path;
0c95f5b2	32	static const char *babeltrace_bin = CONFIG_BABELTRACE_BIN;
0c95f5b2	33
4fc83d94 PP	34	#ifdef LTTNG_EMBED_HELP
	35	static const char help_msg[] =
	36	#include <lttng-view.1.h>
	37	;
	38	#endif
	39
0c95f5b2 DG	40	enum {
	41	OPT_HELP = 1,
	42	OPT_LIST_OPTIONS,
	43	};
	44
	45	static struct poptOption long_options[] = {
	46	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	47	{"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
	48	{"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
	49	{"viewer", 'e', POPT_ARG_STRING, &opt_viewer, 0, 0, 0},
f1f887c0	50	{"trace-path", 't', POPT_ARG_STRING, &opt_trace_path, 0, 0, 0},
0c95f5b2 DG	51	{0, 0, 0, 0, 0, 0, 0}
	52	};
	53
	54	/*
	55	* This is needed for each viewer since we are using execvp().
	56	*/
36ef520f	57	static const char *babeltrace_opts[] = { "babeltrace" };
0c95f5b2 DG	58
	59	/*
	60	* Type is also use as the index in the viewers array. So please, make sure
	61	* your enum value is in the right order in the array below.
	62	*/
	63	enum viewer_type {
	64	VIEWER_BABELTRACE = 0,
6dd26587	65	VIEWER_USER_DEFINED = 1,
0c95f5b2 DG	66	};
	67
	68	/*
	69	* NOTE: "lttv" is a shell command and it's not working for exec() family
	70	* functions so we might think of removing this wrapper or using bash.
	71	*/
45167256	72	static const struct viewers {
0c95f5b2 DG	73	const char *exec_name;
	74	enum viewer_type type;
	75	} viewers[] = {
	76	{ "babeltrace", VIEWER_BABELTRACE },
0c95f5b2 DG	77	{ NULL, VIEWER_USER_DEFINED },
	78	};
	79
8960e9cd DG	80	/* Is the session we are trying to view is in live mode. */
	81	static int session_live_mode;
	82
45167256	83	static const struct viewers *parse_options(void)
0c95f5b2 DG	84	{
	85	if (opt_viewer == NULL) {
	86	/* Default is babeltrace */
	87	return &(viewers[VIEWER_BABELTRACE]);
	88	}
	89
0c95f5b2 DG	90	/*
	91	* This means that if -e, --viewers is used, we just override everything
	92	* with it. For supported viewers like lttv, we could simply detect if "-t"
	93	* is passed and if not, add the trace directory to it.
	94	*/
	95	return &(viewers[VIEWER_USER_DEFINED]);
	96	}
	97
	98	/*
	99	* Alloc an array of string pointer from a simple string having all options
	100	* seperated by spaces. Also adds the trace path to the arguments.
	101	*
	102	* The returning pointer is ready to be passed to execvp().
	103	*/
	104	static char *alloc_argv_from_user_opts(char opts, const char *trace_path)
	105	{
	106	int i = 0, ignore_space = 0;
	107	unsigned int num_opts = 1;
	108	char *argv, token = opts;
	109
	110	/* Count number of arguments. */
	111	do {
	112	if (*token == ' ') {
	113	/* Use to ignore consecutive spaces */
	114	if (!ignore_space) {
	115	num_opts++;
	116	}
	117	ignore_space = 1;
	118	} else {
	119	ignore_space = 0;
	120	}
	121	token++;
	122	} while (*token != '\0');
	123
	124	/* Add two here for the NULL terminating element and trace path */
1025878e	125	argv = zmalloc(sizeof(char ) (num_opts + 2));
0c95f5b2 DG	126	if (argv == NULL) {
	127	goto error;
	128	}
	129
	130	token = strtok(opts, " ");
	131	while (token != NULL) {
	132	argv[i] = strdup(token);
44721eb2 MD	133	if (argv[i] == NULL) {
	134	goto error;
	135	}
0c95f5b2 DG	136	token = strtok(NULL, " ");
	137	i++;
	138	}
	139
	140	argv[num_opts] = (char *) trace_path;
	141	argv[num_opts + 1] = NULL;
	142
	143	return argv;
	144
	145	error:
879ba548 JG	146	if (argv) {
	147	for (i = 0; i < num_opts + 2; i++) {
	148	free(argv[i]);
	149	}
	150	free(argv);
	151	}
	152
0c95f5b2 DG	153	return NULL;
	154	}
	155
	156	/*
	157	* Alloc an array of string pointer from an array of strings. It also adds
	158	* the trace path to the argv.
	159	*
	160	* The returning pointer is ready to be passed to execvp().
	161	*/
	162	static char alloc_argv_from_local_opts(const char opts, size_t opts_len,
	163	const char *trace_path)
	164	{
	165	char **argv;
8960e9cd DG	166	size_t size, mem_len;
	167
	168
	169	/* Add one for the NULL terminating element. */
	170	mem_len = opts_len + 1;
	171	if (session_live_mode) {
	172	/* Add 3 option for the live mode being "-i lttng-live URL". */
	173	mem_len += 3;
	174	} else {
	175	/* Add option for the trace path. */
	176	mem_len += 1;
	177	}
0c95f5b2	178
8960e9cd	179	size = sizeof(char ) mem_len;
0c95f5b2 DG	180
0c95f5b2 DG	181	/* Add two here for the trace_path and the NULL terminating element. */
1025878e	182	argv = zmalloc(size);
0c95f5b2 DG	183	if (argv == NULL) {
	184	goto error;
	185	}
	186
e20ca024	187	memcpy(argv, opts, sizeof(char ) opts_len);
0c95f5b2	188
8960e9cd DG	189	if (session_live_mode) {
	190	argv[opts_len] = "-i";
	191	argv[opts_len + 1] = "lttng-live";
	192	argv[opts_len + 2] = (char *) trace_path;
	193	argv[opts_len + 3] = NULL;
	194	} else {
	195	argv[opts_len] = (char *) trace_path;
	196	argv[opts_len + 1] = NULL;
	197	}
0c95f5b2 DG	198
	199	error:
	200	return argv;
	201	}
	202
	203	/*
	204	* Spawn viewer with the trace directory path.
	205	*/
	206	static int spawn_viewer(const char *trace_path)
	207	{
	208	int ret = 0;
0c95f5b2 DG	209	struct stat status;
0c95f5b2 DG	210	const char *viewer_bin = NULL;
45167256	211	const struct viewers *viewer;
0c95f5b2 DG	212	char **argv = NULL;
	213
	214	/* Check for --viewer options */
	215	viewer = parse_options();
	216	if (viewer == NULL) {
	217	ret = CMD_ERROR;
	218	goto error;
	219	}
	220
85a68078 DG	221	switch (viewer->type) {
	222	case VIEWER_BABELTRACE:
	223	if (stat(babeltrace_bin, &status) == 0) {
	224	viewer_bin = babeltrace_bin;
	225	} else {
	226	viewer_bin = viewer->exec_name;
	227	}
	228	argv = alloc_argv_from_local_opts(babeltrace_opts,
	229	ARRAY_SIZE(babeltrace_opts), trace_path);
	230	break;
85a68078 DG	231	case VIEWER_USER_DEFINED:
	232	argv = alloc_argv_from_user_opts(opt_viewer, trace_path);
	233	if (argv) {
	234	viewer_bin = argv[0];
0c95f5b2	235	}
85a68078 DG	236	break;
	237	default:
	238	viewer_bin = viewers[VIEWER_BABELTRACE].exec_name;
	239	argv = alloc_argv_from_local_opts(babeltrace_opts,
	240	ARRAY_SIZE(babeltrace_opts), trace_path);
	241	break;
	242	}
0c95f5b2	243
57138fbd	244	if (argv == NULL \|\| !viewer_bin) {
85a68078 DG	245	ret = CMD_FATAL;
	246	goto error;
	247	}
0c95f5b2	248
85a68078	249	DBG("Using %s viewer", viewer_bin);
0c95f5b2	250
85a68078 DG	251	ret = execvp(viewer_bin, argv);
85a68078 DG	252	if (ret) {
0c687325 JD	253	if (errno == ENOENT) {
	254	ERR("%s not found on the system", viewer_bin);
	255	} else {
	256	PERROR("exec: %s", viewer_bin);
	257	}
0c95f5b2	258	ret = CMD_FATAL;
85a68078	259	goto error;
0c95f5b2 DG	260	}
	261
	262	error:
45da08a2	263	free(argv);
0c95f5b2 DG	264	return ret;
	265	}
	266
8960e9cd DG	267	/*
	268	* Build the live path we need for the lttng live view.
	269	*/
	270	static char build_live_path(char session_name)
	271	{
	272	int ret;
	273	char *path = NULL;
	274	char hostname[HOST_NAME_MAX];
	275
	276	ret = gethostname(hostname, sizeof(hostname));
	277	if (ret < 0) {
6f04ed72	278	PERROR("gethostname");
8960e9cd DG	279	goto error;
	280	}
	281
	282	ret = asprintf(&path, "net://localhost/host/%s/%s", hostname,
	283	session_name);
	284	if (ret < 0) {
6f04ed72	285	PERROR("asprintf live path");
8960e9cd DG	286	goto error;
	287	}
	288
	289	error:
	290	return path;
	291	}
	292
0c95f5b2 DG	293	/*
	294	* Exec viewer if found and use session name path.
	295	*/
	296	static int view_trace(void)
	297	{
c617c0c6	298	int ret;
8960e9cd	299	char session_name, trace_path = NULL;
0c95f5b2	300	struct lttng_session *sessions = NULL;
f12e3556	301	bool free_trace_path = false;
0c95f5b2 DG	302
	303	/*
	304	* Safety net. If lttng is suid at some point for any useless reasons,
f1f887c0	305	* this prevent any bad execution of binaries.
0c95f5b2 DG	306	*/
	307	if (getuid() != 0) {
	308	if (getuid() != geteuid()) {
	309	ERR("UID does not match effective UID.");
6e9261f4	310	ret = CMD_ERROR;
0c95f5b2 DG	311	goto error;
	312	} else if (getgid() != getegid()) {
	313	ERR("GID does not match effective GID.");
6e9261f4	314	ret = CMD_ERROR;
0c95f5b2 DG	315	goto error;
	316	}
	317	}
	318
f1f887c0 DG	319	/* User define trace path override the session name */
	320	if (opt_trace_path) {
	321	session_name = NULL;
	322	} else if(opt_session_name == NULL) {
0c95f5b2 DG	323	session_name = get_session_name();
	324	if (session_name == NULL) {
	325	ret = CMD_ERROR;
	326	goto error;
	327	}
	328	} else {
	329	session_name = opt_session_name;
	330	}
	331
	332	DBG("Viewing trace for session %s", session_name);
	333
f1f887c0	334	if (session_name) {
c617c0c6 MD	335	int i, count, found = 0;
c617c0c6 MD	336
f1f887c0 DG	337	/* Getting all sessions */
	338	count = lttng_list_sessions(&sessions);
	339	if (count < 0) {
	340	ERR("Unable to list sessions. Session name %s not found.",
	341	session_name);
	342	MSG("Is there a session daemon running?");
	343	ret = CMD_ERROR;
	344	goto free_error;
	345	}
0c95f5b2	346
f1f887c0 DG	347	/* Find our session listed by the session daemon */
	348	for (i = 0; i < count; i++) {
	349	if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
	350	found = 1;
	351	break;
	352	}
0c95f5b2	353	}
0c95f5b2	354
f1f887c0 DG	355	if (!found) {
	356	MSG("Session name %s not found", session_name);
	357	ret = CMD_ERROR;
	358	goto free_sessions;
	359	}
	360
8960e9cd DG	361	session_live_mode = sessions[i].live_timer_interval;
	362
	363	DBG("Session live mode set to %d", session_live_mode);
3822545d	364
8960e9cd	365	if (sessions[i].enabled && !session_live_mode) {
3822545d DG	366	WARN("Session %s is running. Please stop it before reading it.",
	367	session_name);
	368	ret = CMD_ERROR;
	369	goto free_sessions;
	370	}
8960e9cd DG	371
	372	/* If the timer interval is set we are in live mode. */
	373	if (session_live_mode) {
	374	trace_path = build_live_path(session_name);
	375	if (!trace_path) {
	376	ret = CMD_ERROR;
	377	goto free_sessions;
	378	}
f12e3556	379	free_trace_path = true;
8960e9cd DG	380	} else {
	381	/* Get file system session path. */
	382	trace_path = sessions[i].path;
	383	}
f1f887c0 DG	384	} else {
f1f887c0 DG	385	trace_path = opt_trace_path;
0c95f5b2 DG	386	}
0c95f5b2 DG	387
f1f887c0	388	MSG("Trace directory: %s\n", trace_path);
0c95f5b2	389
f1f887c0	390	ret = spawn_viewer(trace_path);
0c95f5b2 DG	391	if (ret < 0) {
	392	/* Don't set ret so lttng can interpret the sessiond error. */
	393	goto free_sessions;
	394	}
	395
0c95f5b2	396	free_sessions:
f12e3556	397	if (session_live_mode && free_trace_path) {
8960e9cd DG	398	free(trace_path);
8960e9cd DG	399	}
0e428499	400	free(sessions);
0c95f5b2 DG	401	free_error:
	402	if (opt_session_name == NULL) {
	403	free(session_name);
	404	}
	405	error:
	406	return ret;
	407	}
	408
	409	/*
	410	* The 'view <options>' first level command
	411	*/
	412	int cmd_view(int argc, const char **argv)
	413	{
	414	int opt, ret = CMD_SUCCESS;
	415	static poptContext pc;
68c7f6e5	416	const char *leftover = NULL;
0c95f5b2 DG	417
	418	pc = poptGetContext(NULL, argc, argv, long_options, 0);
	419	poptReadDefaultConfig(pc, 0);
	420
c7e35b03 JR	421	if (lttng_opt_mi) {
	422	WARN("mi does not apply to view command");
	423	}
	424
0c95f5b2 DG	425	while ((opt = poptGetNextOpt(pc)) != -1) {
	426	switch (opt) {
	427	case OPT_HELP:
4ba92f18	428	SHOW_HELP();
0c95f5b2 DG	429	goto end;
	430	case OPT_LIST_OPTIONS:
	431	list_cmd_options(stdout, long_options);
	432	goto end;
	433	default:
0c95f5b2 DG	434	ret = CMD_UNDEFINED;
	435	goto end;
	436	}
	437	}
	438
	439	opt_session_name = (char*) poptGetArg(pc);
	440
68c7f6e5 JD	441	leftover = poptGetArg(pc);
	442	if (leftover) {
	443	ERR("Unknown argument: %s", leftover);
	444	ret = CMD_ERROR;
	445	goto end;
	446	}
	447
0c95f5b2 DG	448	ret = view_trace();
	449
	450	end:
	451	poptFreeContext(pc);
	452	return ret;
	453	}