[lttng-tools.git] / lttng / commands / enable_channels.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 "../cmd.h"
#include "../conf.h"
#include "../utils.h"

static char *opt_channels;
static char *opt_kernel;
static char *opt_cmd_name;
static char *opt_session_name;
static int opt_pid_all;
static int opt_userspace;
static pid_t opt_pid;
static struct lttng_channel chan;

enum {
	OPT_HELP = 1,
	OPT_DISCARD,
	OPT_OVERWRITE,
	OPT_SUBBUF_SIZE,
	OPT_NUM_SUBBUF,
	OPT_SWITCH_TIMER,
	OPT_READ_TIMER,
	OPT_USERSPACE,
};

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},
	{"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},
	{"discard",        0,   POPT_ARG_NONE, 0, OPT_DISCARD, 0, 0},
	{"overwrite",      0,   POPT_ARG_NONE, 0, OPT_OVERWRITE, 0, 0},
	{"subbuf-size",    0,   POPT_ARG_DOUBLE, 0, OPT_SUBBUF_SIZE, 0, 0},
	{"num-subbuf",     0,   POPT_ARG_INT, 0, OPT_NUM_SUBBUF, 0, 0},
	{"switch-timer",   0,   POPT_ARG_INT, 0, OPT_SWITCH_TIMER, 0, 0},
	{"read-timer",     0,   POPT_ARG_INT, 0, OPT_READ_TIMER, 0, 0},
	{0, 0, 0, 0, 0, 0, 0}
};

/*
 * usage
 */
static void usage(FILE *ofp)
{
	fprintf(ofp, "usage: lttng enable-channel NAME[,NAME2,...] [options] [channel_options]\n");
	fprintf(ofp, "\n");
	fprintf(ofp, "  -h, --help               Show this help\n");
	fprintf(ofp, "  -s, --session            Apply on session name\n");
	fprintf(ofp, "  -k, --kernel             Apply on the kernel tracer\n");
	fprintf(ofp, "  -u, --userspace [CMD]    Apply on 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, "Channel options:\n");
	fprintf(ofp, "      --discard            Discard event when buffers are full (default)\n");
	fprintf(ofp, "      --overwrite          Flight recorder mode\n");
	fprintf(ofp, "      --subbuf-size        Subbuffer size in bytes (default: 4096)\n");
	fprintf(ofp, "      --num-subbuf         Number of subbufers (default: 2)\n");
	fprintf(ofp, "      --switch-timer       Switch timer interval in usec (default: 0)\n");
	fprintf(ofp, "      --read-timer         Read timer interval in usec (default: 200)\n");
	fprintf(ofp, "\n");
}

/*
 *  enable_channel
 *
 *  Adding channel using the lttng API.
 */
static int enable_channel(char *session_name)
{
	int ret = CMD_SUCCESS;
	char *channel_name;
	struct lttng_domain dom;

	if (opt_kernel) {
		dom.type = LTTNG_DOMAIN_KERNEL;
	}

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

	/* Strip event list */
	channel_name = strtok(opt_channels, ",");
	while (channel_name != NULL) {
		/* Kernel tracer action */
		if (opt_kernel) {
			DBG("Enabling kernel channel %s", channel_name);

			/* Copy channel name and normalize it */
			strncpy(chan.name, channel_name, NAME_MAX);
			chan.name[NAME_MAX - 1] = '\0';

			ret = lttng_enable_channel(handle, &chan);
			if (ret < 0) {
				goto error;
			} else {
				MSG("Kernel channel enabled %s", 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 */
		channel_name = strtok(NULL, ",");
	}

error:
	lttng_destroy_handle(handle);

	return ret;
}

/*
 *  init_channel_config
 *
 *  Default value for channel configuration.
 */
static void init_channel_config(void)
{
	chan.attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
	chan.attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
	chan.attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
	chan.attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
	chan.attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
	chan.attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
}

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

	init_channel_config();

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

	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_DISCARD:
			chan.attr.overwrite = 0;
			DBG("Channel set to discard");
			break;
		case OPT_OVERWRITE:
			chan.attr.overwrite = 1;
			DBG("Channel set to overwrite");
			break;
		case OPT_SUBBUF_SIZE:
			chan.attr.subbuf_size = atol(poptGetOptArg(pc));
			DBG("Channel subbuf size set to %" PRIu64, chan.attr.subbuf_size);
			break;
		case OPT_NUM_SUBBUF:
			chan.attr.num_subbuf = atoi(poptGetOptArg(pc));
			DBG("Channel subbuf num set to %" PRIu64, chan.attr.num_subbuf);
			break;
		case OPT_SWITCH_TIMER:
			chan.attr.switch_timer_interval = atoi(poptGetOptArg(pc));
			DBG("Channel switch timer interval set to %d", chan.attr.switch_timer_interval);
			break;
		case OPT_READ_TIMER:
			chan.attr.read_timer_interval = atoi(poptGetOptArg(pc));
			DBG("Channel read timer interval set to %d", chan.attr.read_timer_interval);
			break;
		default:
			usage(stderr);
			ret = CMD_UNDEFINED;
			goto end;
		}
	}

	opt_channels = (char*) poptGetArg(pc);
	if (opt_channels == NULL) {
		ERR("Missing channel name.\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_channel(session_name);

end:
	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
	29	#include "../cmd.h"
	30	#include "../conf.h"
	31	#include "../utils.h"
	32
	33	static char *opt_channels;
	34	static char *opt_kernel;
	35	static char *opt_cmd_name;
	36	static char *opt_session_name;
	37	static int opt_pid_all;
	38	static int opt_userspace;
	39	static pid_t opt_pid;
	40	static struct lttng_channel chan;
	41
	42	enum {
	43	OPT_HELP = 1,
	44	OPT_DISCARD,
	45	OPT_OVERWRITE,
	46	OPT_SUBBUF_SIZE,
	47	OPT_NUM_SUBBUF,
	48	OPT_SWITCH_TIMER,
	49	OPT_READ_TIMER,
	50	OPT_USERSPACE,
	51	};
	52
	53	static struct lttng_handle *handle;
	54
	55	static struct poptOption long_options[] = {
	56	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	57	{"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
	58	{"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
	59	{"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
	60	{"userspace", 'u', POPT_ARG_STRING \| POPT_ARGFLAG_OPTIONAL, 0, OPT_USERSPACE, 0, 0},
	61	{"all", 0, POPT_ARG_VAL, &opt_pid_all, 1, 0, 0},
	62	{"pid", 'p', POPT_ARG_INT, &opt_pid, 0, 0, 0},
	63	{"discard", 0, POPT_ARG_NONE, 0, OPT_DISCARD, 0, 0},
	64	{"overwrite", 0, POPT_ARG_NONE, 0, OPT_OVERWRITE, 0, 0},
	65	{"subbuf-size", 0, POPT_ARG_DOUBLE, 0, OPT_SUBBUF_SIZE, 0, 0},
	66	{"num-subbuf", 0, POPT_ARG_INT, 0, OPT_NUM_SUBBUF, 0, 0},
	67	{"switch-timer", 0, POPT_ARG_INT, 0, OPT_SWITCH_TIMER, 0, 0},
	68	{"read-timer", 0, POPT_ARG_INT, 0, OPT_READ_TIMER, 0, 0},
	69	{0, 0, 0, 0, 0, 0, 0}
	70	};
	71
	72	/*
	73	* usage
	74	*/
	75	static void usage(FILE *ofp)
	76	{
	77	fprintf(ofp, "usage: lttng enable-channel NAME[,NAME2,...] [options] [channel_options]\n");
	78	fprintf(ofp, "\n");
	79	fprintf(ofp, " -h, --help Show this help\n");
	80	fprintf(ofp, " -s, --session Apply on session name\n");
	81	fprintf(ofp, " -k, --kernel Apply on the kernel tracer\n");
	82	fprintf(ofp, " -u, --userspace [CMD] Apply on the user-space tracer\n");
	83	fprintf(ofp, " --all If -u, apply on all traceable apps\n");
	84	fprintf(ofp, " -p, --pid PID If -u, apply on a specific PID\n");
	85	fprintf(ofp, "\n");
	86	fprintf(ofp, "Channel options:\n");
	87	fprintf(ofp, " --discard Discard event when buffers are full (default)\n");
	88	fprintf(ofp, " --overwrite Flight recorder mode\n");
	89	fprintf(ofp, " --subbuf-size Subbuffer size in bytes (default: 4096)\n");
	90	fprintf(ofp, " --num-subbuf Number of subbufers (default: 2)\n");
	91	fprintf(ofp, " --switch-timer Switch timer interval in usec (default: 0)\n");
	92	fprintf(ofp, " --read-timer Read timer interval in usec (default: 200)\n");
	93	fprintf(ofp, "\n");
	94	}
	95
	96	/*
	97	* enable_channel
	98	*
	99	* Adding channel using the lttng API.
	100	*/
	101	static int enable_channel(char *session_name)
	102	{
	103	int ret = CMD_SUCCESS;
	104	char *channel_name;
	105	struct lttng_domain dom;
	106
	107	if (opt_kernel) {
	108	dom.type = LTTNG_DOMAIN_KERNEL;
	109	}
	110
	111	handle = lttng_create_handle(session_name, &dom);
	112	if (handle == NULL) {
	113	ret = -1;
	114	goto error;
	115	}
	116
	117	/* Strip event list */
	118	channel_name = strtok(opt_channels, ",");
	119	while (channel_name != NULL) {
	120	/* Kernel tracer action */
	121	if (opt_kernel) {
	122	DBG("Enabling kernel channel %s", channel_name);
	123
	124	/* Copy channel name and normalize it */
	125	strncpy(chan.name, channel_name, NAME_MAX);
	126	chan.name[NAME_MAX - 1] = '\0';
	127
	128	ret = lttng_enable_channel(handle, &chan);
	129	if (ret < 0) {
	130	goto error;
	131	} else {
	132	MSG("Kernel channel enabled %s", channel_name);
	133	}
	134	} else if (opt_userspace) { /* User-space tracer action */
	135	/*
	136	* TODO: Waiting on lttng UST 2.0
	137	*/
	138	if (opt_pid_all) {
	139	} else if (opt_pid != 0) {
	140	}
	141	ret = CMD_NOT_IMPLEMENTED;
	142	goto error;
	143	} else {
	144	ERR("Please specify a tracer (--kernel or --userspace)");
	145	goto error;
	146	}
	147
	148	/* Next event */
	149	channel_name = strtok(NULL, ",");
	150	}
	151
	152	error:
	153	lttng_destroy_handle(handle);
	154
	155	return ret;
	156	}
	157
	158	/*
	159	* init_channel_config
	160	*
	161	* Default value for channel configuration.
	162	*/
	163	static void init_channel_config(void)
	164	{
	165	chan.attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
	166	chan.attr.subbuf_size = DEFAULT_CHANNEL_SUBBUF_SIZE;
	167	chan.attr.num_subbuf = DEFAULT_CHANNEL_SUBBUF_NUM;
	168	chan.attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
	169	chan.attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
	170	chan.attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
	171	}
	172
	173	/*
	174	* Add channel to trace session
	175	*/
	176	int cmd_enable_channels(int argc, const char **argv)
	177	{
	178	int opt, ret;
	179	static poptContext pc;
	180	char *session_name = NULL;
	181
	182	init_channel_config();
	183
	184	pc = poptGetContext(NULL, argc, argv, long_options, 0);
	185	poptReadDefaultConfig(pc, 0);
	186
	187	while ((opt = poptGetNextOpt(pc)) != -1) {
	188	switch (opt) {
	189	case OPT_HELP:
	190	usage(stderr);
	191	ret = CMD_SUCCESS;
	192	goto end;
	193	case OPT_USERSPACE:
	194	opt_userspace = 1;
	195	opt_cmd_name = poptGetOptArg(pc);
	196	break;
	197	case OPT_DISCARD:
	198	chan.attr.overwrite = 0;
	199	DBG("Channel set to discard");
	200	break;
	201	case OPT_OVERWRITE:
	202	chan.attr.overwrite = 1;
	203	DBG("Channel set to overwrite");
	204	break;
	205	case OPT_SUBBUF_SIZE:
	206	chan.attr.subbuf_size = atol(poptGetOptArg(pc));
	207	DBG("Channel subbuf size set to %" PRIu64, chan.attr.subbuf_size);
	208	break;
	209	case OPT_NUM_SUBBUF:
	210	chan.attr.num_subbuf = atoi(poptGetOptArg(pc));
	211	DBG("Channel subbuf num set to %" PRIu64, chan.attr.num_subbuf);
	212	break;
	213	case OPT_SWITCH_TIMER:
	214	chan.attr.switch_timer_interval = atoi(poptGetOptArg(pc));
	215	DBG("Channel switch timer interval set to %d", chan.attr.switch_timer_interval);
	216	break;
	217	case OPT_READ_TIMER:
	218	chan.attr.read_timer_interval = atoi(poptGetOptArg(pc));
	219	DBG("Channel read timer interval set to %d", chan.attr.read_timer_interval);
	220	break;
	221	default:
	222	usage(stderr);
	223	ret = CMD_UNDEFINED;
	224	goto end;
	225	}
	226	}
	227
	228	opt_channels = (char*) poptGetArg(pc);
	229	if (opt_channels == NULL) {
	230	ERR("Missing channel name.\n");
	231	usage(stderr);
	232	ret = CMD_SUCCESS;
	233	goto end;
	234	}
	235
	236	if (!opt_session_name) {
	237	session_name = get_session_name();
	238	if (session_name == NULL) {
	239	ret = -1;
	240	goto end;
	241	}
	242	} else {
	243	session_name = opt_session_name;
	244	}
	245
	246	ret = enable_channel(session_name);
	247
	248	end:
	249	return ret;
	250	}