[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;
//static const char *lttv_gui_bin = CONFIG_LTTV_GUI_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" };
//static const char *lttv_gui_opts[] = { "lttv-gui", "-t", };

/*
 * 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_LTTV_GUI      = 1,
	VIEWER_USER_DEFINED  = 2,
};

/*
 * 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 struct viewers {
	const char *exec_name;
	enum viewer_type type;
} viewers[] = {
	{ "babeltrace", VIEWER_BABELTRACE },
	{ "lttv-gui", VIEWER_LTTV_GUI },
	{ NULL, VIEWER_USER_DEFINED },
};

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

static 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, size);

	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;
	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;

	/*
	 * 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;
			}
		} 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(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 DG	32	static const char *babeltrace_bin = CONFIG_BABELTRACE_BIN;
	33	//static const char *lttv_gui_bin = CONFIG_LTTV_GUI_BIN;
	34
4fc83d94 PP	35	#ifdef LTTNG_EMBED_HELP
	36	static const char help_msg[] =
	37	#include <lttng-view.1.h>
	38	;
	39	#endif
	40
0c95f5b2 DG	41	enum {
	42	OPT_HELP = 1,
	43	OPT_LIST_OPTIONS,
	44	};
	45
	46	static struct poptOption long_options[] = {
	47	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	48	{"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
	49	{"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
	50	{"viewer", 'e', POPT_ARG_STRING, &opt_viewer, 0, 0, 0},
f1f887c0	51	{"trace-path", 't', POPT_ARG_STRING, &opt_trace_path, 0, 0, 0},
0c95f5b2 DG	52	{0, 0, 0, 0, 0, 0, 0}
	53	};
	54
	55	/*
	56	* This is needed for each viewer since we are using execvp().
	57	*/
36ef520f	58	static const char *babeltrace_opts[] = { "babeltrace" };
0c95f5b2 DG	59	//static const char *lttv_gui_opts[] = { "lttv-gui", "-t", };
	60
	61	/*
	62	* Type is also use as the index in the viewers array. So please, make sure
	63	* your enum value is in the right order in the array below.
	64	*/
	65	enum viewer_type {
	66	VIEWER_BABELTRACE = 0,
	67	VIEWER_LTTV_GUI = 1,
	68	VIEWER_USER_DEFINED = 2,
	69	};
	70
	71	/*
	72	* NOTE: "lttv" is a shell command and it's not working for exec() family
	73	* functions so we might think of removing this wrapper or using bash.
	74	*/
	75	static struct viewers {
	76	const char *exec_name;
	77	enum viewer_type type;
	78	} viewers[] = {
	79	{ "babeltrace", VIEWER_BABELTRACE },
	80	{ "lttv-gui", VIEWER_LTTV_GUI },
	81	{ NULL, VIEWER_USER_DEFINED },
	82	};
	83
8960e9cd DG	84	/* Is the session we are trying to view is in live mode. */
	85	static int session_live_mode;
	86
0c95f5b2 DG	87	static struct viewers *parse_options(void)
	88	{
	89	if (opt_viewer == NULL) {
	90	/* Default is babeltrace */
	91	return &(viewers[VIEWER_BABELTRACE]);
	92	}
	93
0c95f5b2 DG	94	/*
	95	* This means that if -e, --viewers is used, we just override everything
	96	* with it. For supported viewers like lttv, we could simply detect if "-t"
	97	* is passed and if not, add the trace directory to it.
	98	*/
	99	return &(viewers[VIEWER_USER_DEFINED]);
	100	}
	101
	102	/*
	103	* Alloc an array of string pointer from a simple string having all options
	104	* seperated by spaces. Also adds the trace path to the arguments.
	105	*
	106	* The returning pointer is ready to be passed to execvp().
	107	*/
	108	static char *alloc_argv_from_user_opts(char opts, const char *trace_path)
	109	{
	110	int i = 0, ignore_space = 0;
	111	unsigned int num_opts = 1;
	112	char *argv, token = opts;
	113
	114	/* Count number of arguments. */
	115	do {
	116	if (*token == ' ') {
	117	/* Use to ignore consecutive spaces */
	118	if (!ignore_space) {
	119	num_opts++;
	120	}
	121	ignore_space = 1;
	122	} else {
	123	ignore_space = 0;
	124	}
	125	token++;
	126	} while (*token != '\0');
	127
	128	/* Add two here for the NULL terminating element and trace path */
1025878e	129	argv = zmalloc(sizeof(char ) (num_opts + 2));
0c95f5b2 DG	130	if (argv == NULL) {
	131	goto error;
	132	}
	133
	134	token = strtok(opts, " ");
	135	while (token != NULL) {
	136	argv[i] = strdup(token);
44721eb2 MD	137	if (argv[i] == NULL) {
	138	goto error;
	139	}
0c95f5b2 DG	140	token = strtok(NULL, " ");
	141	i++;
	142	}
	143
	144	argv[num_opts] = (char *) trace_path;
	145	argv[num_opts + 1] = NULL;
	146
	147	return argv;
	148
	149	error:
879ba548 JG	150	if (argv) {
	151	for (i = 0; i < num_opts + 2; i++) {
	152	free(argv[i]);
	153	}
	154	free(argv);
	155	}
	156
0c95f5b2 DG	157	return NULL;
	158	}
	159
	160	/*
	161	* Alloc an array of string pointer from an array of strings. It also adds
	162	* the trace path to the argv.
	163	*
	164	* The returning pointer is ready to be passed to execvp().
	165	*/
	166	static char alloc_argv_from_local_opts(const char opts, size_t opts_len,
	167	const char *trace_path)
	168	{
	169	char **argv;
8960e9cd DG	170	size_t size, mem_len;
	171
	172
	173	/* Add one for the NULL terminating element. */
	174	mem_len = opts_len + 1;
	175	if (session_live_mode) {
	176	/* Add 3 option for the live mode being "-i lttng-live URL". */
	177	mem_len += 3;
	178	} else {
	179	/* Add option for the trace path. */
	180	mem_len += 1;
	181	}
0c95f5b2	182
8960e9cd	183	size = sizeof(char ) mem_len;
0c95f5b2 DG	184
0c95f5b2 DG	185	/* Add two here for the trace_path and the NULL terminating element. */
1025878e	186	argv = zmalloc(size);
0c95f5b2 DG	187	if (argv == NULL) {
	188	goto error;
	189	}
	190
	191	memcpy(argv, opts, size);
	192
8960e9cd DG	193	if (session_live_mode) {
	194	argv[opts_len] = "-i";
	195	argv[opts_len + 1] = "lttng-live";
	196	argv[opts_len + 2] = (char *) trace_path;
	197	argv[opts_len + 3] = NULL;
	198	} else {
	199	argv[opts_len] = (char *) trace_path;
	200	argv[opts_len + 1] = NULL;
	201	}
0c95f5b2 DG	202
	203	error:
	204	return argv;
	205	}
	206
	207	/*
	208	* Spawn viewer with the trace directory path.
	209	*/
	210	static int spawn_viewer(const char *trace_path)
	211	{
	212	int ret = 0;
0c95f5b2 DG	213	struct stat status;
	214	const char *viewer_bin = NULL;
	215	struct viewers *viewer;
	216	char **argv = NULL;
	217
	218	/* Check for --viewer options */
	219	viewer = parse_options();
	220	if (viewer == NULL) {
	221	ret = CMD_ERROR;
	222	goto error;
	223	}
	224
85a68078 DG	225	switch (viewer->type) {
	226	case VIEWER_BABELTRACE:
	227	if (stat(babeltrace_bin, &status) == 0) {
	228	viewer_bin = babeltrace_bin;
	229	} else {
	230	viewer_bin = viewer->exec_name;
	231	}
	232	argv = alloc_argv_from_local_opts(babeltrace_opts,
	233	ARRAY_SIZE(babeltrace_opts), trace_path);
	234	break;
85a68078 DG	235	case VIEWER_USER_DEFINED:
	236	argv = alloc_argv_from_user_opts(opt_viewer, trace_path);
	237	if (argv) {
	238	viewer_bin = argv[0];
0c95f5b2	239	}
85a68078 DG	240	break;
	241	default:
	242	viewer_bin = viewers[VIEWER_BABELTRACE].exec_name;
	243	argv = alloc_argv_from_local_opts(babeltrace_opts,
	244	ARRAY_SIZE(babeltrace_opts), trace_path);
	245	break;
	246	}
0c95f5b2	247
57138fbd	248	if (argv == NULL \|\| !viewer_bin) {
85a68078 DG	249	ret = CMD_FATAL;
	250	goto error;
	251	}
0c95f5b2	252
85a68078	253	DBG("Using %s viewer", viewer_bin);
0c95f5b2	254
85a68078 DG	255	ret = execvp(viewer_bin, argv);
85a68078 DG	256	if (ret) {
0c687325 JD	257	if (errno == ENOENT) {
	258	ERR("%s not found on the system", viewer_bin);
	259	} else {
	260	PERROR("exec: %s", viewer_bin);
	261	}
0c95f5b2	262	ret = CMD_FATAL;
85a68078	263	goto error;
0c95f5b2 DG	264	}
	265
	266	error:
45da08a2	267	free(argv);
0c95f5b2 DG	268	return ret;
	269	}
	270
8960e9cd DG	271	/*
	272	* Build the live path we need for the lttng live view.
	273	*/
	274	static char build_live_path(char session_name)
	275	{
	276	int ret;
	277	char *path = NULL;
	278	char hostname[HOST_NAME_MAX];
	279
	280	ret = gethostname(hostname, sizeof(hostname));
	281	if (ret < 0) {
6f04ed72	282	PERROR("gethostname");
8960e9cd DG	283	goto error;
	284	}
	285
	286	ret = asprintf(&path, "net://localhost/host/%s/%s", hostname,
	287	session_name);
	288	if (ret < 0) {
6f04ed72	289	PERROR("asprintf live path");
8960e9cd DG	290	goto error;
	291	}
	292
	293	error:
	294	return path;
	295	}
	296
0c95f5b2 DG	297	/*
	298	* Exec viewer if found and use session name path.
	299	*/
	300	static int view_trace(void)
	301	{
c617c0c6	302	int ret;
8960e9cd	303	char session_name, trace_path = NULL;
0c95f5b2 DG	304	struct lttng_session *sessions = NULL;
	305
	306	/*
	307	* Safety net. If lttng is suid at some point for any useless reasons,
f1f887c0	308	* this prevent any bad execution of binaries.
0c95f5b2 DG	309	*/
	310	if (getuid() != 0) {
	311	if (getuid() != geteuid()) {
	312	ERR("UID does not match effective UID.");
6e9261f4	313	ret = CMD_ERROR;
0c95f5b2 DG	314	goto error;
	315	} else if (getgid() != getegid()) {
	316	ERR("GID does not match effective GID.");
6e9261f4	317	ret = CMD_ERROR;
0c95f5b2 DG	318	goto error;
	319	}
	320	}
	321
f1f887c0 DG	322	/* User define trace path override the session name */
	323	if (opt_trace_path) {
	324	session_name = NULL;
	325	} else if(opt_session_name == NULL) {
0c95f5b2 DG	326	session_name = get_session_name();
	327	if (session_name == NULL) {
	328	ret = CMD_ERROR;
	329	goto error;
	330	}
	331	} else {
	332	session_name = opt_session_name;
	333	}
	334
	335	DBG("Viewing trace for session %s", session_name);
	336
f1f887c0	337	if (session_name) {
c617c0c6 MD	338	int i, count, found = 0;
c617c0c6 MD	339
f1f887c0 DG	340	/* Getting all sessions */
	341	count = lttng_list_sessions(&sessions);
	342	if (count < 0) {
	343	ERR("Unable to list sessions. Session name %s not found.",
	344	session_name);
	345	MSG("Is there a session daemon running?");
	346	ret = CMD_ERROR;
	347	goto free_error;
	348	}
0c95f5b2	349
f1f887c0 DG	350	/* Find our session listed by the session daemon */
	351	for (i = 0; i < count; i++) {
	352	if (strncmp(sessions[i].name, session_name, NAME_MAX) == 0) {
	353	found = 1;
	354	break;
	355	}
0c95f5b2	356	}
0c95f5b2	357
f1f887c0 DG	358	if (!found) {
	359	MSG("Session name %s not found", session_name);
	360	ret = CMD_ERROR;
	361	goto free_sessions;
	362	}
	363
8960e9cd DG	364	session_live_mode = sessions[i].live_timer_interval;
	365
	366	DBG("Session live mode set to %d", session_live_mode);
3822545d	367
8960e9cd	368	if (sessions[i].enabled && !session_live_mode) {
3822545d DG	369	WARN("Session %s is running. Please stop it before reading it.",
	370	session_name);
	371	ret = CMD_ERROR;
	372	goto free_sessions;
	373	}
8960e9cd DG	374
	375	/* If the timer interval is set we are in live mode. */
	376	if (session_live_mode) {
	377	trace_path = build_live_path(session_name);
	378	if (!trace_path) {
	379	ret = CMD_ERROR;
	380	goto free_sessions;
	381	}
	382	} else {
	383	/* Get file system session path. */
	384	trace_path = sessions[i].path;
	385	}
f1f887c0 DG	386	} else {
f1f887c0 DG	387	trace_path = opt_trace_path;
0c95f5b2 DG	388	}
0c95f5b2 DG	389
f1f887c0	390	MSG("Trace directory: %s\n", trace_path);
0c95f5b2	391
f1f887c0	392	ret = spawn_viewer(trace_path);
0c95f5b2 DG	393	if (ret < 0) {
	394	/* Don't set ret so lttng can interpret the sessiond error. */
	395	goto free_sessions;
	396	}
	397
0c95f5b2	398	free_sessions:
8960e9cd DG	399	if (session_live_mode) {
	400	free(trace_path);
	401	}
0e428499	402	free(sessions);
0c95f5b2 DG	403	free_error:
	404	if (opt_session_name == NULL) {
	405	free(session_name);
	406	}
	407	error:
	408	return ret;
	409	}
	410
	411	/*
	412	* The 'view <options>' first level command
	413	*/
	414	int cmd_view(int argc, const char **argv)
	415	{
	416	int opt, ret = CMD_SUCCESS;
	417	static poptContext pc;
68c7f6e5	418	const char *leftover = NULL;
0c95f5b2 DG	419
	420	pc = poptGetContext(NULL, argc, argv, long_options, 0);
	421	poptReadDefaultConfig(pc, 0);
	422
c7e35b03 JR	423	if (lttng_opt_mi) {
	424	WARN("mi does not apply to view command");
	425	}
	426
0c95f5b2 DG	427	while ((opt = poptGetNextOpt(pc)) != -1) {
	428	switch (opt) {
	429	case OPT_HELP:
4ba92f18	430	SHOW_HELP();
0c95f5b2 DG	431	goto end;
	432	case OPT_LIST_OPTIONS:
	433	list_cmd_options(stdout, long_options);
	434	goto end;
	435	default:
0c95f5b2 DG	436	ret = CMD_UNDEFINED;
	437	goto end;
	438	}
	439	}
	440
	441	opt_session_name = (char*) poptGetArg(pc);
	442
68c7f6e5 JD	443	leftover = poptGetArg(pc);
	444	if (leftover) {
	445	ERR("Unknown argument: %s", leftover);
	446	ret = CMD_ERROR;
	447	goto end;
	448	}
	449
0c95f5b2 DG	450	ret = view_trace();
	451
	452	end:
	453	poptFreeContext(pc);
	454	return ret;
	455	}