[lttng-tools.git] / lttng / commands / enable_events.c

/*
 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; only version 2
 * of the License.
 *
 * 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., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#define _GNU_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 <inttypes.h>
#include <ctype.h>

#include "../cmd.h"
#include "../conf.h"
#include "../utils.h"

static char *opt_event_list;
static int opt_event_type;
static char *opt_kernel;
static char *opt_cmd_name;
static char *opt_session_name;
static int opt_pid_all;
static int opt_userspace;
static int opt_enable_all;
static pid_t opt_pid;
static char *opt_probe;
static char *opt_function;
static char *opt_function_entry_symbol;
static char *opt_channel_name;

enum {
	OPT_HELP = 1,
	OPT_USERSPACE,
	OPT_TRACEPOINT,
	OPT_MARKER,
	OPT_PROBE,
	OPT_FUNCTION,
	OPT_FUNCTION_ENTRY,
};

static struct lttng_handle *handle;

static struct poptOption long_options[] = {
	/* 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},
	{"all-events",     'a', POPT_ARG_VAL, &opt_enable_all, 1, 0, 0},
	{"channel",        'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
	{"kernel",         'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
	{"userspace",      'u', POPT_ARG_STRING | POPT_ARGFLAG_OPTIONAL, 0, OPT_USERSPACE, 0, 0},
	{"all",            0,   POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
	{"pid",            'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
	{"tracepoint",     0,   POPT_ARG_NONE, 0, OPT_TRACEPOINT, 0, 0},
	{"marker",         0,   POPT_ARG_NONE, 0, OPT_MARKER, 0, 0},
	{"probe",         0,   POPT_ARG_STRING, 0, OPT_PROBE, 0, 0},
	{"function",       0,   POPT_ARG_STRING, 0, OPT_FUNCTION, 0, 0},
	{"function:entry", 0,   POPT_ARG_STRING, 0, OPT_FUNCTION_ENTRY, 0, 0},
	{0, 0, 0, 0, 0, 0, 0}
};

/*
 * usage
 */
static void usage(FILE *ofp)
{
	fprintf(ofp, "usage: lttng enable-event NAME[,NAME2,...] [options] [event_options]\n");
	fprintf(ofp, "\n");
	fprintf(ofp, "  -h, --help               Show this help\n");
	fprintf(ofp, "  -s, --session            Apply on session name\n");
	fprintf(ofp, "  -c, --channel            Apply on this channel\n");
	fprintf(ofp, "  -a, --all-events         Enable all tracepoints\n");
	fprintf(ofp, "  -k, --kernel             Apply for the kernel tracer\n");
	fprintf(ofp, "  -u, --userspace [CMD]    Apply for the user-space tracer\n");
	fprintf(ofp, "      --all                If -u, apply on all traceable apps\n");
	fprintf(ofp, "  -p, --pid PID            If -u, apply on a specific PID\n");
	fprintf(ofp, "\n");
	fprintf(ofp, "Event options:\n");
	fprintf(ofp, "    --tracepoint           Tracepoint event (default)\n");
	fprintf(ofp, "    --probe [addr | symbol | symbol+offset]\n");
	fprintf(ofp, "                           Dynamic probe.\n");
	fprintf(ofp, "                           Addr and offset can be octal (0NNN...),\n");
	fprintf(ofp, "                           decimal (NNN...) or hexadecimal (0xNNN...)\n");
	fprintf(ofp, "    --function [addr | symbol | symbol+offset]\n");
	fprintf(ofp, "                           Dynamic function entry/return probe.\n");
	fprintf(ofp, "                           Addr and offset can be octal (0NNN...),\n");
	fprintf(ofp, "                           decimal (NNN...) or hexadecimal (0xNNN...)\n");
	fprintf(ofp, "    --function:entry symbol\n");
	fprintf(ofp, "                           Function tracer event\n");
	fprintf(ofp, "    --marker               User-space marker (deprecated)\n");
	fprintf(ofp, "\n");
}

/*
 *  parse_probe_addr
 *
 *  Parse probe options.
 */
static int parse_probe_opts(struct lttng_event *ev, char *opt)
{
	int ret;
	char s_hex[19];
	char name[LTTNG_SYMBOL_NAME_LEN];

	if (opt == NULL) {
		ret = -1;
		goto end;
	}

	/* Check for symbol+offset */
	ret = sscanf(opt, "%[^'+']+%s", name, s_hex);
	if (ret == 2) {
		strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
		ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
		DBG("probe symbol %s", ev->attr.probe.symbol_name);
		if (strlen(s_hex) == 0) {
			ERR("Invalid probe offset %s", s_hex);
			ret = -1;
			goto end;
		}
		ev->attr.probe.offset = strtoul(s_hex, NULL, 0);
		DBG("probe offset %" PRIu64, ev->attr.probe.offset);
		ev->attr.probe.addr = 0;
		goto end;
	}

	/* Check for symbol */
	if (isalpha(name[0])) {
		ret = sscanf(opt, "%s", name);
		if (ret == 1) {
			strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
			ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
			DBG("probe symbol %s", ev->attr.probe.symbol_name);
			ev->attr.probe.offset = 0;
			DBG("probe offset %" PRIu64, ev->attr.probe.offset);
			ev->attr.probe.addr = 0;
			goto end;
		}
	}

	/* Check for address */
	ret = sscanf(opt, "%s", s_hex);
	if (ret > 0) {
		if (strlen(s_hex) == 0) {
			ERR("Invalid probe address %s", s_hex);
			ret = -1;
			goto end;
		}
		ev->attr.probe.addr = strtoul(s_hex, NULL, 0);
		DBG("probe addr %" PRIu64, ev->attr.probe.addr);
		ev->attr.probe.offset = 0;
		memset(ev->attr.probe.symbol_name, 0, LTTNG_SYMBOL_NAME_LEN);
		goto end;
	}

	/* No match */
	ret = -1;

end:
	return ret;
}

/*
 *  enable_events
 *
 *  Enabling event using the lttng API.
 */
static int enable_events(char *session_name)
{
	int err, ret = CMD_SUCCESS;
	char *event_name, *channel_name = NULL;
	struct lttng_event ev;
	struct lttng_domain dom;

	if (opt_channel_name == NULL) {
		err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
		if (err < 0) {
			ret = CMD_FATAL;
			goto error;
		}
	} else {
		channel_name = opt_channel_name;
	}

	/* Create lttng domain */
	if (opt_kernel) {
		dom.type = LTTNG_DOMAIN_KERNEL;
	}

	handle = lttng_create_handle(session_name, &dom);
	if (handle == NULL) {
		ret = -1;
		goto error;
	}

	if (opt_enable_all) {
		if (opt_kernel) {
			ret = lttng_enable_event(handle, NULL, channel_name);
			if (ret == 0) {
				MSG("All kernel events are enabled in channel %s", channel_name);
			}
			goto error;
		}

		/* TODO: User-space tracer */
	}

	/* Strip event list */
	event_name = strtok(opt_event_list, ",");
	while (event_name != NULL) {
		/* Kernel tracer action */
		if (opt_kernel) {
			DBG("Enabling kernel event %s for channel %s",
					event_name, channel_name);
			/* Copy name and type of the event */
			strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
			ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
			ev.type = opt_event_type;

			switch (opt_event_type) {
			case LTTNG_EVENT_TRACEPOINT:
				break;
			case LTTNG_EVENT_PROBE:
				ret = parse_probe_opts(&ev, opt_probe);
				if (ret < 0) {
					ERR("Unable to parse probe options");
					ret = 0;
					goto error;
				}
				break;
			case LTTNG_EVENT_FUNCTION:
				ret = parse_probe_opts(&ev, opt_function);
				if (ret < 0) {
					ERR("Unable to parse function probe options");
					ret = 0;
					goto error;
				}
				break;
			case LTTNG_EVENT_FUNCTION_ENTRY:
				strncpy(ev.attr.ftrace.symbol_name,
					opt_function_entry_symbol,
					LTTNG_SYMBOL_NAME_LEN);
				ev.attr.ftrace.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
				break;
			default:
				ret = CMD_NOT_IMPLEMENTED;
				goto error;
			}

			ret = lttng_enable_event(handle, &ev, channel_name);
			if (ret == 0) {
				MSG("Kernel event %s created in channel %s", event_name, channel_name);
			}
		} else if (opt_userspace) {		/* User-space tracer action */
			/*
			 * TODO: Waiting on lttng UST 2.0
			 */
			if (opt_pid_all) {
			} else if (opt_pid != 0) {
			}
			ret = CMD_NOT_IMPLEMENTED;
			goto error;
		} else {
			ERR("Please specify a tracer (--kernel or --userspace)");
			goto error;
		}

		/* Next event */
		event_name = strtok(NULL, ",");
	}

error:
	if (opt_channel_name == NULL) {
		free(channel_name);
	}
	lttng_destroy_handle(handle);

	return ret;
}

/*
 *  cmd_enable_events
 *
 *  Add event to trace session
 */
int cmd_enable_events(int argc, const char **argv)
{
	int opt, ret;
	static poptContext pc;
	char *session_name = NULL;

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

	/* Default event type */
	opt_event_type = LTTNG_EVENT_TRACEPOINT;

	while ((opt = poptGetNextOpt(pc)) != -1) {
		switch (opt) {
		case OPT_HELP:
			usage(stderr);
			ret = CMD_SUCCESS;
			goto end;
		case OPT_USERSPACE:
			opt_userspace = 1;
			opt_cmd_name = poptGetOptArg(pc);
			break;
		case OPT_TRACEPOINT:
			opt_event_type = LTTNG_EVENT_TRACEPOINT;
			break;
		case OPT_MARKER:
			ret = CMD_NOT_IMPLEMENTED;
			goto end;
		case OPT_PROBE:
			opt_event_type = LTTNG_EVENT_PROBE;
			opt_probe = poptGetOptArg(pc);
			break;
		case OPT_FUNCTION:
			opt_event_type = LTTNG_EVENT_FUNCTION;
			opt_function = poptGetOptArg(pc);
			break;
		case OPT_FUNCTION_ENTRY:
			opt_event_type = LTTNG_EVENT_FUNCTION_ENTRY;
			opt_function_entry_symbol = poptGetOptArg(pc);
			break;
		default:
			usage(stderr);
			ret = CMD_UNDEFINED;
			goto end;
		}
	}

	opt_event_list = (char*) poptGetArg(pc);
	if (opt_event_list == NULL && opt_enable_all == 0) {
		ERR("Missing event name(s).\n");
		usage(stderr);
		ret = CMD_SUCCESS;
		goto end;
	}

	if (!opt_session_name) {
		session_name = get_session_name();
		if (session_name == NULL) {
			ret = -1;
			goto end;
		}
	} else {
		session_name = opt_session_name;
	}

	ret = enable_events(session_name);

end:
	if (opt_session_name == NULL) {
		free(session_name);
	}

	return ret;
}
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
	3	*
	4	* This program is free software; you can redistribute it and/or
	5	* modify it under the terms of the GNU General Public License
	6	* as published by the Free Software Foundation; only version 2
	7	* of the License.
	8	*
	9	* This program is distributed in the hope that it will be useful,
	10	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	11	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	12	* GNU General Public License for more details.
	13	*
	14	* You should have received a copy of the GNU General Public License
	15	* along with this program; if not, write to the Free Software
	16	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	17	*/
	18
	19	#define _GNU_SOURCE
	20	#include <popt.h>
	21	#include <stdio.h>
	22	#include <stdlib.h>
	23	#include <string.h>
	24	#include <sys/stat.h>
	25	#include <sys/types.h>
	26	#include <unistd.h>
	27	#include <inttypes.h>
	28	#include <ctype.h>
	29
	30	#include "../cmd.h"
	31	#include "../conf.h"
	32	#include "../utils.h"
	33
	34	static char *opt_event_list;
	35	static int opt_event_type;
	36	static char *opt_kernel;
	37	static char *opt_cmd_name;
	38	static char *opt_session_name;
	39	static int opt_pid_all;
	40	static int opt_userspace;
	41	static int opt_enable_all;
	42	static pid_t opt_pid;
	43	static char *opt_probe;
	44	static char *opt_function;
	45	static char *opt_function_entry_symbol;
	46	static char *opt_channel_name;
	47
	48	enum {
	49	OPT_HELP = 1,
	50	OPT_USERSPACE,
	51	OPT_TRACEPOINT,
	52	OPT_MARKER,
	53	OPT_PROBE,
	54	OPT_FUNCTION,
	55	OPT_FUNCTION_ENTRY,
	56	};
	57
	58	static struct lttng_handle *handle;
	59
	60	static struct poptOption long_options[] = {
	61	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	62	{"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
	63	{"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
	64	{"all-events", 'a', POPT_ARG_VAL, &opt_enable_all, 1, 0, 0},
	65	{"channel", 'c', POPT_ARG_STRING, &opt_channel_name, 0, 0, 0},
	66	{"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
	67	{"userspace", 'u', POPT_ARG_STRING \| POPT_ARGFLAG_OPTIONAL, 0, OPT_USERSPACE, 0, 0},
	68	{"all", 0, POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
	69	{"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
	70	{"tracepoint", 0, POPT_ARG_NONE, 0, OPT_TRACEPOINT, 0, 0},
	71	{"marker", 0, POPT_ARG_NONE, 0, OPT_MARKER, 0, 0},
	72	{"probe", 0, POPT_ARG_STRING, 0, OPT_PROBE, 0, 0},
	73	{"function", 0, POPT_ARG_STRING, 0, OPT_FUNCTION, 0, 0},
	74	{"function:entry", 0, POPT_ARG_STRING, 0, OPT_FUNCTION_ENTRY, 0, 0},
	75	{0, 0, 0, 0, 0, 0, 0}
	76	};
	77
	78	/*
	79	* usage
	80	*/
	81	static void usage(FILE *ofp)
	82	{
	83	fprintf(ofp, "usage: lttng enable-event NAME[,NAME2,...] [options] [event_options]\n");
	84	fprintf(ofp, "\n");
	85	fprintf(ofp, " -h, --help Show this help\n");
	86	fprintf(ofp, " -s, --session Apply on session name\n");
	87	fprintf(ofp, " -c, --channel Apply on this channel\n");
	88	fprintf(ofp, " -a, --all-events Enable all tracepoints\n");
	89	fprintf(ofp, " -k, --kernel Apply for the kernel tracer\n");
	90	fprintf(ofp, " -u, --userspace [CMD] Apply for the user-space tracer\n");
	91	fprintf(ofp, " --all If -u, apply on all traceable apps\n");
	92	fprintf(ofp, " -p, --pid PID If -u, apply on a specific PID\n");
	93	fprintf(ofp, "\n");
	94	fprintf(ofp, "Event options:\n");
	95	fprintf(ofp, " --tracepoint Tracepoint event (default)\n");
	96	fprintf(ofp, " --probe [addr \| symbol \| symbol+offset]\n");
	97	fprintf(ofp, " Dynamic probe.\n");
	98	fprintf(ofp, " Addr and offset can be octal (0NNN...),\n");
	99	fprintf(ofp, " decimal (NNN...) or hexadecimal (0xNNN...)\n");
	100	fprintf(ofp, " --function [addr \| symbol \| symbol+offset]\n");
	101	fprintf(ofp, " Dynamic function entry/return probe.\n");
	102	fprintf(ofp, " Addr and offset can be octal (0NNN...),\n");
	103	fprintf(ofp, " decimal (NNN...) or hexadecimal (0xNNN...)\n");
	104	fprintf(ofp, " --function:entry symbol\n");
	105	fprintf(ofp, " Function tracer event\n");
	106	fprintf(ofp, " --marker User-space marker (deprecated)\n");
	107	fprintf(ofp, "\n");
	108	}
	109
	110	/*
	111	* parse_probe_addr
	112	*
	113	* Parse probe options.
	114	*/
	115	static int parse_probe_opts(struct lttng_event ev, char opt)
	116	{
	117	int ret;
	118	char s_hex[19];
	119	char name[LTTNG_SYMBOL_NAME_LEN];
	120
	121	if (opt == NULL) {
	122	ret = -1;
	123	goto end;
	124	}
	125
	126	/* Check for symbol+offset */
	127	ret = sscanf(opt, "%[^'+']+%s", name, s_hex);
	128	if (ret == 2) {
	129	strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
	130	ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
	131	DBG("probe symbol %s", ev->attr.probe.symbol_name);
	132	if (strlen(s_hex) == 0) {
	133	ERR("Invalid probe offset %s", s_hex);
	134	ret = -1;
	135	goto end;
	136	}
	137	ev->attr.probe.offset = strtoul(s_hex, NULL, 0);
	138	DBG("probe offset %" PRIu64, ev->attr.probe.offset);
	139	ev->attr.probe.addr = 0;
	140	goto end;
	141	}
	142
	143	/* Check for symbol */
	144	if (isalpha(name[0])) {
	145	ret = sscanf(opt, "%s", name);
	146	if (ret == 1) {
	147	strncpy(ev->attr.probe.symbol_name, name, LTTNG_SYMBOL_NAME_LEN);
	148	ev->attr.probe.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
	149	DBG("probe symbol %s", ev->attr.probe.symbol_name);
	150	ev->attr.probe.offset = 0;
	151	DBG("probe offset %" PRIu64, ev->attr.probe.offset);
	152	ev->attr.probe.addr = 0;
	153	goto end;
	154	}
	155	}
	156
	157	/* Check for address */
	158	ret = sscanf(opt, "%s", s_hex);
	159	if (ret > 0) {
	160	if (strlen(s_hex) == 0) {
	161	ERR("Invalid probe address %s", s_hex);
	162	ret = -1;
	163	goto end;
	164	}
	165	ev->attr.probe.addr = strtoul(s_hex, NULL, 0);
	166	DBG("probe addr %" PRIu64, ev->attr.probe.addr);
	167	ev->attr.probe.offset = 0;
	168	memset(ev->attr.probe.symbol_name, 0, LTTNG_SYMBOL_NAME_LEN);
	169	goto end;
	170	}
	171
	172	/* No match */
	173	ret = -1;
	174
	175	end:
	176	return ret;
	177	}
	178
	179	/*
	180	* enable_events
	181	*
	182	* Enabling event using the lttng API.
	183	*/
	184	static int enable_events(char *session_name)
	185	{
	186	int err, ret = CMD_SUCCESS;
	187	char event_name, channel_name = NULL;
	188	struct lttng_event ev;
	189	struct lttng_domain dom;
	190
	191	if (opt_channel_name == NULL) {
	192	err = asprintf(&channel_name, DEFAULT_CHANNEL_NAME);
	193	if (err < 0) {
	194	ret = CMD_FATAL;
	195	goto error;
	196	}
	197	} else {
	198	channel_name = opt_channel_name;
	199	}
	200
	201	/* Create lttng domain */
	202	if (opt_kernel) {
	203	dom.type = LTTNG_DOMAIN_KERNEL;
	204	}
	205
	206	handle = lttng_create_handle(session_name, &dom);
	207	if (handle == NULL) {
	208	ret = -1;
	209	goto error;
	210	}
	211
	212	if (opt_enable_all) {
	213	if (opt_kernel) {
	214	ret = lttng_enable_event(handle, NULL, channel_name);
	215	if (ret == 0) {
	216	MSG("All kernel events are enabled in channel %s", channel_name);
	217	}
	218	goto error;
	219	}
	220
	221	/* TODO: User-space tracer */
	222	}
	223
	224	/* Strip event list */
	225	event_name = strtok(opt_event_list, ",");
	226	while (event_name != NULL) {
	227	/* Kernel tracer action */
	228	if (opt_kernel) {
	229	DBG("Enabling kernel event %s for channel %s",
	230	event_name, channel_name);
	231	/* Copy name and type of the event */
	232	strncpy(ev.name, event_name, LTTNG_SYMBOL_NAME_LEN);
	233	ev.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
	234	ev.type = opt_event_type;
	235
	236	switch (opt_event_type) {
	237	case LTTNG_EVENT_TRACEPOINT:
	238	break;
	239	case LTTNG_EVENT_PROBE:
	240	ret = parse_probe_opts(&ev, opt_probe);
	241	if (ret < 0) {
	242	ERR("Unable to parse probe options");
	243	ret = 0;
	244	goto error;
	245	}
	246	break;
	247	case LTTNG_EVENT_FUNCTION:
	248	ret = parse_probe_opts(&ev, opt_function);
	249	if (ret < 0) {
	250	ERR("Unable to parse function probe options");
	251	ret = 0;
	252	goto error;
	253	}
	254	break;
	255	case LTTNG_EVENT_FUNCTION_ENTRY:
	256	strncpy(ev.attr.ftrace.symbol_name,
	257	opt_function_entry_symbol,
	258	LTTNG_SYMBOL_NAME_LEN);
	259	ev.attr.ftrace.symbol_name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0';
	260	break;
	261	default:
	262	ret = CMD_NOT_IMPLEMENTED;
	263	goto error;
	264	}
	265
	266	ret = lttng_enable_event(handle, &ev, channel_name);
	267	if (ret == 0) {
	268	MSG("Kernel event %s created in channel %s", event_name, channel_name);
	269	}
	270	} else if (opt_userspace) { /* User-space tracer action */
	271	/*
	272	* TODO: Waiting on lttng UST 2.0
	273	*/
	274	if (opt_pid_all) {
	275	} else if (opt_pid != 0) {
	276	}
	277	ret = CMD_NOT_IMPLEMENTED;
	278	goto error;
	279	} else {
	280	ERR("Please specify a tracer (--kernel or --userspace)");
	281	goto error;
	282	}
	283
	284	/* Next event */
	285	event_name = strtok(NULL, ",");
	286	}
	287
	288	error:
	289	if (opt_channel_name == NULL) {
	290	free(channel_name);
	291	}
	292	lttng_destroy_handle(handle);
	293
	294	return ret;
	295	}
	296
	297	/*
	298	* cmd_enable_events
	299	*
	300	* Add event to trace session
	301	*/
	302	int cmd_enable_events(int argc, const char **argv)
	303	{
	304	int opt, ret;
	305	static poptContext pc;
	306	char *session_name = NULL;
	307
	308	pc = poptGetContext(NULL, argc, argv, long_options, 0);
	309	poptReadDefaultConfig(pc, 0);
	310
	311	/* Default event type */
	312	opt_event_type = LTTNG_EVENT_TRACEPOINT;
	313
	314	while ((opt = poptGetNextOpt(pc)) != -1) {
	315	switch (opt) {
	316	case OPT_HELP:
	317	usage(stderr);
	318	ret = CMD_SUCCESS;
	319	goto end;
	320	case OPT_USERSPACE:
	321	opt_userspace = 1;
	322	opt_cmd_name = poptGetOptArg(pc);
	323	break;
	324	case OPT_TRACEPOINT:
	325	opt_event_type = LTTNG_EVENT_TRACEPOINT;
	326	break;
	327	case OPT_MARKER:
	328	ret = CMD_NOT_IMPLEMENTED;
	329	goto end;
	330	case OPT_PROBE:
	331	opt_event_type = LTTNG_EVENT_PROBE;
	332	opt_probe = poptGetOptArg(pc);
	333	break;
	334	case OPT_FUNCTION:
	335	opt_event_type = LTTNG_EVENT_FUNCTION;
	336	opt_function = poptGetOptArg(pc);
	337	break;
	338	case OPT_FUNCTION_ENTRY:
	339	opt_event_type = LTTNG_EVENT_FUNCTION_ENTRY;
	340	opt_function_entry_symbol = poptGetOptArg(pc);
	341	break;
	342	default:
	343	usage(stderr);
	344	ret = CMD_UNDEFINED;
	345	goto end;
	346	}
	347	}
	348
	349	opt_event_list = (char*) poptGetArg(pc);
	350	if (opt_event_list == NULL && opt_enable_all == 0) {
	351	ERR("Missing event name(s).\n");
	352	usage(stderr);
	353	ret = CMD_SUCCESS;
	354	goto end;
	355	}
	356
	357	if (!opt_session_name) {
	358	session_name = get_session_name();
	359	if (session_name == NULL) {
	360	ret = -1;
	361	goto end;
	362	}
	363	} else {
	364	session_name = opt_session_name;
	365	}
	366
	367	ret = enable_events(session_name);
	368
	369	end:
	370	if (opt_session_name == NULL) {
	371	free(session_name);
	372	}
	373
	374	return ret;
	375	}