[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;

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);
		}
		free(argv);
		ret = CMD_FATAL;
		goto error;
	}

error:
	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;

	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);

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