[lttng-tools.git] / src / bin / 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, 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 _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 "../command.h"

#include <src/common/sessiond-comm/sessiond-comm.h>

static char *opt_channels;
static int opt_kernel;
static char *opt_session_name;
static int opt_userspace;
static struct lttng_channel chan;
static char *opt_output;
static int opt_buffer_uid;
static int opt_buffer_pid;
static int opt_buffer_global;

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

static struct lttng_handle *handle;

const char *output_mmap = "mmap";
const char *output_splice = "splice";

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_NONE, 0, OPT_USERSPACE, 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},
	{"list-options",   0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
	{"output",         0,   POPT_ARG_STRING, &opt_output, 0, 0, 0},
	{"buffers-uid",    0,	POPT_ARG_VAL, &opt_buffer_uid, 1, 0, 0},
	{"buffers-pid",    0,	POPT_ARG_VAL, &opt_buffer_pid, 1, 0, 0},
	{"buffers-global", 0,	POPT_ARG_VAL, &opt_buffer_global, 1, 0, 0},
	{"tracefile-size", 'C',   POPT_ARG_INT, 0, OPT_TRACEFILE_SIZE, 0, 0},
	{"tracefile-count", 'W',   POPT_ARG_INT, 0, OPT_TRACEFILE_COUNT, 0, 0},
	{0, 0, 0, 0, 0, 0, 0}
};

/*
 * usage
 */
static void usage(FILE *ofp)
{
	fprintf(ofp, "usage: lttng enable-channel NAME[,NAME2,...] [-u|-k] [OPTIONS]\n");
	fprintf(ofp, "\n");
	fprintf(ofp, "Options:\n");
	fprintf(ofp, "  -h, --help               Show this help\n");
	fprintf(ofp, "      --list-options       Simple listing of options\n");
	fprintf(ofp, "  -s, --session NAME       Apply to session name\n");
	fprintf(ofp, "  -k, --kernel             Apply to the kernel tracer\n");
	fprintf(ofp, "  -u, --userspace          Apply to the user-space tracer\n");
	fprintf(ofp, "\n");
	fprintf(ofp, "Channel options:\n");
	fprintf(ofp, "      --discard            Discard event when buffers are full%s\n",
		DEFAULT_CHANNEL_OVERWRITE ? "" : " (default)");
	fprintf(ofp, "      --overwrite          Flight recorder mode%s\n",
		DEFAULT_CHANNEL_OVERWRITE ? " (default)" : "");
	fprintf(ofp, "      --subbuf-size SIZE   Subbuffer size in bytes\n");
	fprintf(ofp, "                               (default: %zu, kernel default: %zu)\n",
		default_get_channel_subbuf_size(),
		default_get_kernel_channel_subbuf_size());
	fprintf(ofp, "                               Needs to be a power of 2 for\n");
        fprintf(ofp, "                               kernel and ust tracers\n");
	fprintf(ofp, "      --num-subbuf NUM     Number of subbufers\n");
	fprintf(ofp, "                               (default: %u)\n",
		DEFAULT_CHANNEL_SUBBUF_NUM);
	fprintf(ofp, "                               Needs to be a power of 2 for\n");
        fprintf(ofp, "                               kernel and ust tracers\n");
	fprintf(ofp, "      --switch-timer USEC  Switch timer interval in usec (default: %u)\n",
		DEFAULT_CHANNEL_SWITCH_TIMER);
	fprintf(ofp, "      --read-timer USEC    Read timer interval in usec (UST default: %u, kernel default: %u)\n",
		DEFAULT_UST_CHANNEL_READ_TIMER, DEFAULT_KERNEL_CHANNEL_READ_TIMER);
	fprintf(ofp, "      --output TYPE        Channel output type (Values: %s, %s)\n",
			output_mmap, output_splice);
	fprintf(ofp, "      --buffers-uid        Use per UID buffer (-u only)\n");
	fprintf(ofp, "      --buffers-pid        Use per PID buffer (-u only)\n");
	fprintf(ofp, "      --buffers-global     Use shared buffer for the whole system (-k only)\n");
	fprintf(ofp, "  -C, --tracefile-size SIZE\n");
	fprintf(ofp, "                           Maximum size of of each tracefile within a stream (in bytes).\n");
	fprintf(ofp, "  -W, --tracefile-count COUNT\n");
	fprintf(ofp, "                           Used in conjunction with -C option, this will limit the number\n");
	fprintf(ofp, "                           of files created to the specified count.\n");
	fprintf(ofp, "\n");
}

/*
 * Set default attributes depending on those already defined from the command
 * line.
 */
static void set_default_attr(struct lttng_domain *dom)
{
	struct lttng_channel_attr default_attr;

	/* Set attributes */
	lttng_channel_set_default_attr(dom, &default_attr);

	if (chan.attr.overwrite == -1) {
		chan.attr.overwrite = default_attr.overwrite;
	}
	if (chan.attr.subbuf_size == -1) {
		chan.attr.subbuf_size = default_attr.subbuf_size;
	}
	if (chan.attr.num_subbuf == -1) {
		chan.attr.num_subbuf = default_attr.num_subbuf;
	}
	if (chan.attr.switch_timer_interval == -1) {
		chan.attr.switch_timer_interval = default_attr.switch_timer_interval;
	}
	if (chan.attr.read_timer_interval == -1) {
		chan.attr.read_timer_interval = default_attr.read_timer_interval;
	}
	if (chan.attr.output == -1) {
		chan.attr.output = default_attr.output;
	}
	if (chan.attr.tracefile_count == -1) {
		chan.attr.tracefile_count = default_attr.tracefile_count;
	}
	if (chan.attr.tracefile_size == -1) {
		chan.attr.tracefile_size = default_attr.tracefile_size;
	}
}

/*
 * Adding channel using the lttng API.
 */
static int enable_channel(char *session_name)
{
	int ret = CMD_SUCCESS, warn = 0;
	char *channel_name;
	struct lttng_domain dom;

	memset(&dom, 0, sizeof(dom));

	/* Create lttng domain */
	if (opt_kernel) {
		dom.type = LTTNG_DOMAIN_KERNEL;
		dom.buf_type = LTTNG_BUFFER_GLOBAL;
		if (opt_buffer_uid || opt_buffer_pid) {
			ERR("Buffer type not supported for domain -k");
			ret = CMD_ERROR;
			goto error;
		}
	} else if (opt_userspace) {
		dom.type = LTTNG_DOMAIN_UST;
		if (opt_buffer_uid) {
			dom.buf_type = LTTNG_BUFFER_PER_UID;
		} else {
			if (opt_buffer_global) {
				ERR("Buffer type not supported for domain -u");
				ret = CMD_ERROR;
				goto error;
			}
			dom.buf_type = LTTNG_BUFFER_PER_PID;
		}
	} else {
		ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
		ret = CMD_ERROR;
		goto error;
	}

	set_default_attr(&dom);

	if ((chan.attr.tracefile_size > 0) &&
			(chan.attr.tracefile_size < chan.attr.subbuf_size)) {
		ERR("Tracefile_size must be greater than or equal to subbuf_size "
				"(%" PRIu64 " < %" PRIu64 ")",
				chan.attr.tracefile_size, chan.attr.subbuf_size);
		ret = CMD_ERROR;
		goto error;
	}

	/* Setting channel output */
	if (opt_output) {
		if (!strncmp(output_mmap, opt_output, strlen(output_mmap))) {
			chan.attr.output = LTTNG_EVENT_MMAP;
		} else if (!strncmp(output_splice, opt_output, strlen(output_splice))) {
			chan.attr.output = LTTNG_EVENT_SPLICE;
		} else {
			ERR("Unknown output type %s. Possible values are: %s, %s\n",
					opt_output, output_mmap, output_splice);
			usage(stderr);
			ret = CMD_ERROR;
			goto error;
		}
	}

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

	/* Strip channel list (format: chan1,chan2,...) */
	channel_name = strtok(opt_channels, ",");
	while (channel_name != NULL) {
		/* Copy channel name and normalize it */
		strncpy(chan.name, channel_name, NAME_MAX);
		chan.name[NAME_MAX - 1] = '\0';

		DBG("Enabling channel %s", channel_name);

		ret = lttng_enable_channel(handle, &chan);
		if (ret < 0) {
			switch (-ret) {
			case LTTNG_ERR_KERN_CHAN_EXIST:
			case LTTNG_ERR_UST_CHAN_EXIST:
				WARN("Channel %s: %s (session %s)", channel_name,
						lttng_strerror(ret), session_name);
				goto error;
			default:
				ERR("Channel %s: %s (session %s)", channel_name,
						lttng_strerror(ret), session_name);
				break;
			}
			warn = 1;
		} else {
			MSG("%s channel %s enabled for session %s",
					opt_kernel ? "Kernel" : "UST", channel_name,
					session_name);
		}

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

	ret = CMD_SUCCESS;

error:
	if (warn) {
		ret = CMD_WARNING;
	}

	lttng_destroy_handle(handle);

	return ret;
}

/*
 * Default value for channel configuration.
 */
static void init_channel_config(void)
{
	/*
	 * Put -1 everywhere so we can identify those set by the command line and
	 * those needed to be set by the default values.
	 */
	memset(&chan.attr, -1, sizeof(chan.attr));
}

/*
 * Add channel to trace session
 */
int cmd_enable_channels(int argc, const char **argv)
{
	int opt, ret = CMD_SUCCESS;
	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(stdout);
			goto end;
		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:
			/* TODO Replace atol with strtol and check for errors */
			chan.attr.subbuf_size = atol(poptGetOptArg(pc));
			DBG("Channel subbuf size set to %" PRIu64, chan.attr.subbuf_size);
			break;
		case OPT_NUM_SUBBUF:
			/* TODO Replace atoi with strtol and check for errors */
			chan.attr.num_subbuf = atoi(poptGetOptArg(pc));
			DBG("Channel subbuf num set to %" PRIu64, chan.attr.num_subbuf);
			break;
		case OPT_SWITCH_TIMER:
			/* TODO Replace atoi with strtol and check for errors */
			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:
			/* TODO Replace atoi with strtol and check for errors */
			chan.attr.read_timer_interval = atoi(poptGetOptArg(pc));
			DBG("Channel read timer interval set to %d", chan.attr.read_timer_interval);
			break;
		case OPT_USERSPACE:
			opt_userspace = 1;
			break;
		case OPT_TRACEFILE_SIZE:
			chan.attr.tracefile_size = atoll(poptGetOptArg(pc));
			DBG("Maximum tracefile size set to %" PRIu64,
					chan.attr.tracefile_size);
			break;
		case OPT_TRACEFILE_COUNT:
			chan.attr.tracefile_count = atoll(poptGetOptArg(pc));
			DBG("Maximum tracefile count set to %" PRIu64,
					chan.attr.tracefile_count);
			break;
		case OPT_LIST_OPTIONS:
			list_cmd_options(stdout, long_options);
			goto end;
		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_ERROR;
		goto end;
	}

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

	ret = enable_channel(session_name);

end:
	if (!opt_session_name && session_name) {
		free(session_name);
	}
	poptFreeContext(pc);
	return ret;
}
Commit	Line	Data
d36b8583 DG	1	/*
	2	* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
	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.
d36b8583 DG	7	*
	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.
	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.
d36b8583 DG	16	*/
	17
	18	#define _GNU_SOURCE
	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>
5a0de755	26	#include <inttypes.h>
d36b8583	27
c399183f	28	#include "../command.h"
d36b8583	29
42224349 DG	30	#include <src/common/sessiond-comm/sessiond-comm.h>
42224349 DG	31
d36b8583	32	static char *opt_channels;
5edd7e09	33	static int opt_kernel;
5440dc42	34	static char *opt_session_name;
d36b8583	35	static int opt_userspace;
d78d6610	36	static struct lttng_channel chan;
a79d84dd	37	static char *opt_output;
7972aab2 DG	38	static int opt_buffer_uid;
	39	static int opt_buffer_pid;
	40	static int opt_buffer_global;
d36b8583 DG	41
	42	enum {
	43	OPT_HELP = 1,
7d29a247 DG	44	OPT_DISCARD,
	45	OPT_OVERWRITE,
	46	OPT_SUBBUF_SIZE,
	47	OPT_NUM_SUBBUF,
	48	OPT_SWITCH_TIMER,
	49	OPT_READ_TIMER,
d36b8583	50	OPT_USERSPACE,
679b4943	51	OPT_LIST_OPTIONS,
1624d5b7 JD	52	OPT_TRACEFILE_SIZE,
1624d5b7 JD	53	OPT_TRACEFILE_COUNT,
d36b8583 DG	54	};
d36b8583 DG	55
cd80958d DG	56	static struct lttng_handle *handle;
cd80958d DG	57
a79d84dd DG	58	const char *output_mmap = "mmap";
	59	const char *output_splice = "splice";
	60
d36b8583 DG	61	static struct poptOption long_options[] = {
	62	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	63	{"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
5440dc42	64	{"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
d36b8583	65	{"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
d78d6610	66	{"userspace", 'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
7d29a247 DG	67	{"discard", 0, POPT_ARG_NONE, 0, OPT_DISCARD, 0, 0},
7d29a247 DG	68	{"overwrite", 0, POPT_ARG_NONE, 0, OPT_OVERWRITE, 0, 0},
1b579521 DG	69	{"subbuf-size", 0, POPT_ARG_DOUBLE, 0, OPT_SUBBUF_SIZE, 0, 0},
	70	{"num-subbuf", 0, POPT_ARG_INT, 0, OPT_NUM_SUBBUF, 0, 0},
	71	{"switch-timer", 0, POPT_ARG_INT, 0, OPT_SWITCH_TIMER, 0, 0},
	72	{"read-timer", 0, POPT_ARG_INT, 0, OPT_READ_TIMER, 0, 0},
679b4943	73	{"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
a79d84dd	74	{"output", 0, POPT_ARG_STRING, &opt_output, 0, 0, 0},
7972aab2 DG	75	{"buffers-uid", 0, POPT_ARG_VAL, &opt_buffer_uid, 1, 0, 0},
	76	{"buffers-pid", 0, POPT_ARG_VAL, &opt_buffer_pid, 1, 0, 0},
	77	{"buffers-global", 0, POPT_ARG_VAL, &opt_buffer_global, 1, 0, 0},
1624d5b7 JD	78	{"tracefile-size", 'C', POPT_ARG_INT, 0, OPT_TRACEFILE_SIZE, 0, 0},
1624d5b7 JD	79	{"tracefile-count", 'W', POPT_ARG_INT, 0, OPT_TRACEFILE_COUNT, 0, 0},
d36b8583 DG	80	{0, 0, 0, 0, 0, 0, 0}
	81	};
	82
	83	/*
	84	* usage
	85	*/
	86	static void usage(FILE *ofp)
	87	{
32a6298d	88	fprintf(ofp, "usage: lttng enable-channel NAME[,NAME2,...] [-u\|-k] [OPTIONS]\n");
d36b8583	89	fprintf(ofp, "\n");
32a6298d	90	fprintf(ofp, "Options:\n");
7d29a247	91	fprintf(ofp, " -h, --help Show this help\n");
679b4943	92	fprintf(ofp, " --list-options Simple listing of options\n");
32a6298d	93	fprintf(ofp, " -s, --session NAME Apply to session name\n");
27221701	94	fprintf(ofp, " -k, --kernel Apply to the kernel tracer\n");
27221701	95	fprintf(ofp, " -u, --userspace Apply to the user-space tracer\n");
7d29a247 DG	96	fprintf(ofp, "\n");
7d29a247 DG	97	fprintf(ofp, "Channel options:\n");
cabd9892 MD	98	fprintf(ofp, " --discard Discard event when buffers are full%s\n",
	99	DEFAULT_CHANNEL_OVERWRITE ? "" : " (default)");
	100	fprintf(ofp, " --overwrite Flight recorder mode%s\n",
	101	DEFAULT_CHANNEL_OVERWRITE ? " (default)" : "");
cc62c0c0	102	fprintf(ofp, " --subbuf-size SIZE Subbuffer size in bytes\n");
3e230f92 SM	103	fprintf(ofp, " (default: %zu, kernel default: %zu)\n",
	104	default_get_channel_subbuf_size(),
	105	default_get_kernel_channel_subbuf_size());
93e6c8a0 MD	106	fprintf(ofp, " Needs to be a power of 2 for\n");
93e6c8a0 MD	107	fprintf(ofp, " kernel and ust tracers\n");
cc62c0c0	108	fprintf(ofp, " --num-subbuf NUM Number of subbufers\n");
9f778c9a MD	109	fprintf(ofp, " (default: %u)\n",
9f778c9a MD	110	DEFAULT_CHANNEL_SUBBUF_NUM);
93e6c8a0 MD	111	fprintf(ofp, " Needs to be a power of 2 for\n");
93e6c8a0 MD	112	fprintf(ofp, " kernel and ust tracers\n");
cc62c0c0	113	fprintf(ofp, " --switch-timer USEC Switch timer interval in usec (default: %u)\n",
cabd9892	114	DEFAULT_CHANNEL_SWITCH_TIMER);
db77f3a3 DG	115	fprintf(ofp, " --read-timer USEC Read timer interval in usec (UST default: %u, kernel default: %u)\n",
db77f3a3 DG	116	DEFAULT_UST_CHANNEL_READ_TIMER, DEFAULT_KERNEL_CHANNEL_READ_TIMER);
a79d84dd DG	117	fprintf(ofp, " --output TYPE Channel output type (Values: %s, %s)\n",
a79d84dd DG	118	output_mmap, output_splice);
7972aab2 DG	119	fprintf(ofp, " --buffers-uid Use per UID buffer (-u only)\n");
	120	fprintf(ofp, " --buffers-pid Use per PID buffer (-u only)\n");
	121	fprintf(ofp, " --buffers-global Use shared buffer for the whole system (-k only)\n");
1624d5b7 JD	122	fprintf(ofp, " -C, --tracefile-size SIZE\n");
	123	fprintf(ofp, " Maximum size of of each tracefile within a stream (in bytes).\n");
	124	fprintf(ofp, " -W, --tracefile-count COUNT\n");
	125	fprintf(ofp, " Used in conjunction with -C option, this will limit the number\n");
	126	fprintf(ofp, " of files created to the specified count.\n");
d36b8583 DG	127	fprintf(ofp, "\n");
	128	}
	129
5edd7e09 DG	130	/*
	131	* Set default attributes depending on those already defined from the command
	132	* line.
	133	*/
	134	static void set_default_attr(struct lttng_domain *dom)
	135	{
	136	struct lttng_channel_attr default_attr;
	137
	138	/* Set attributes */
	139	lttng_channel_set_default_attr(dom, &default_attr);
	140
	141	if (chan.attr.overwrite == -1) {
	142	chan.attr.overwrite = default_attr.overwrite;
	143	}
	144	if (chan.attr.subbuf_size == -1) {
	145	chan.attr.subbuf_size = default_attr.subbuf_size;
	146	}
	147	if (chan.attr.num_subbuf == -1) {
	148	chan.attr.num_subbuf = default_attr.num_subbuf;
	149	}
	150	if (chan.attr.switch_timer_interval == -1) {
	151	chan.attr.switch_timer_interval = default_attr.switch_timer_interval;
	152	}
	153	if (chan.attr.read_timer_interval == -1) {
	154	chan.attr.read_timer_interval = default_attr.read_timer_interval;
	155	}
	156	if (chan.attr.output == -1) {
	157	chan.attr.output = default_attr.output;
	158	}
1624d5b7 JD	159	if (chan.attr.tracefile_count == -1) {
	160	chan.attr.tracefile_count = default_attr.tracefile_count;
	161	}
	162	if (chan.attr.tracefile_size == -1) {
	163	chan.attr.tracefile_size = default_attr.tracefile_size;
	164	}
5edd7e09 DG	165	}
5edd7e09 DG	166
d36b8583	167	/*
0fdd1e2c	168	* Adding channel using the lttng API.
d36b8583	169	*/
cd80958d	170	static int enable_channel(char *session_name)
d36b8583	171	{
ae856491	172	int ret = CMD_SUCCESS, warn = 0;
d36b8583	173	char *channel_name;
7d29a247	174	struct lttng_domain dom;
d36b8583	175
441c16a7 MD	176	memset(&dom, 0, sizeof(dom));
441c16a7 MD	177
d78d6610	178	/* Create lttng domain */
7d29a247 DG	179	if (opt_kernel) {
7d29a247 DG	180	dom.type = LTTNG_DOMAIN_KERNEL;
7972aab2	181	dom.buf_type = LTTNG_BUFFER_GLOBAL;
88c5f0d8 DG	182	if (opt_buffer_uid \|\| opt_buffer_pid) {
	183	ERR("Buffer type not supported for domain -k");
	184	ret = CMD_ERROR;
	185	goto error;
	186	}
d78d6610	187	} else if (opt_userspace) {
f6a9efaa	188	dom.type = LTTNG_DOMAIN_UST;
7972aab2 DG	189	if (opt_buffer_uid) {
	190	dom.buf_type = LTTNG_BUFFER_PER_UID;
	191	} else {
88c5f0d8 DG	192	if (opt_buffer_global) {
	193	ERR("Buffer type not supported for domain -u");
	194	ret = CMD_ERROR;
	195	goto error;
	196	}
7972aab2 DG	197	dom.buf_type = LTTNG_BUFFER_PER_PID;
7972aab2 DG	198	}
0fdd1e2c	199	} else {
e14f64a8	200	ERR("Please specify a tracer (-k/--kernel or -u/--userspace)");
d16c1a4c	201	ret = CMD_ERROR;
0fdd1e2c	202	goto error;
7d29a247 DG	203	}
7d29a247 DG	204
5edd7e09 DG	205	set_default_attr(&dom);
5edd7e09 DG	206
1624d5b7 JD	207	if ((chan.attr.tracefile_size > 0) &&
	208	(chan.attr.tracefile_size < chan.attr.subbuf_size)) {
	209	ERR("Tracefile_size must be greater than or equal to subbuf_size "
	210	"(%" PRIu64 " < %" PRIu64 ")",
	211	chan.attr.tracefile_size, chan.attr.subbuf_size);
	212	ret = CMD_ERROR;
	213	goto error;
	214	}
	215
a79d84dd DG	216	/* Setting channel output */
	217	if (opt_output) {
	218	if (!strncmp(output_mmap, opt_output, strlen(output_mmap))) {
	219	chan.attr.output = LTTNG_EVENT_MMAP;
	220	} else if (!strncmp(output_splice, opt_output, strlen(output_splice))) {
	221	chan.attr.output = LTTNG_EVENT_SPLICE;
	222	} else {
	223	ERR("Unknown output type %s. Possible values are: %s, %s\n",
	224	opt_output, output_mmap, output_splice);
	225	usage(stderr);
	226	ret = CMD_ERROR;
	227	goto error;
	228	}
	229	}
	230
cd80958d DG	231	handle = lttng_create_handle(session_name, &dom);
	232	if (handle == NULL) {
	233	ret = -1;
	234	goto error;
	235	}
	236
0fdd1e2c	237	/* Strip channel list (format: chan1,chan2,...) */
d36b8583 DG	238	channel_name = strtok(opt_channels, ",");
d36b8583 DG	239	while (channel_name != NULL) {
0fdd1e2c DG	240	/* Copy channel name and normalize it */
	241	strncpy(chan.name, channel_name, NAME_MAX);
	242	chan.name[NAME_MAX - 1] = '\0';
	243
	244	DBG("Enabling channel %s", channel_name);
	245
	246	ret = lttng_enable_channel(handle, &chan);
	247	if (ret < 0) {
42224349	248	switch (-ret) {
f73fabfd DG	249	case LTTNG_ERR_KERN_CHAN_EXIST:
f73fabfd DG	250	case LTTNG_ERR_UST_CHAN_EXIST:
88c5f0d8	251	WARN("Channel %s: %s (session %s)", channel_name,
42224349 DG	252	lttng_strerror(ret), session_name);
	253	goto error;
	254	default:
	255	ERR("Channel %s: %s (session %s)", channel_name,
	256	lttng_strerror(ret), session_name);
	257	break;
	258	}
ae856491	259	warn = 1;
d36b8583	260	} else {
7885e399 DG	261	MSG("%s channel %s enabled for session %s",
	262	opt_kernel ? "Kernel" : "UST", channel_name,
	263	session_name);
d36b8583 DG	264	}
	265
	266	/* Next event */
	267	channel_name = strtok(NULL, ",");
	268	}
	269
ae856491 DG	270	ret = CMD_SUCCESS;
ae856491 DG	271
d36b8583	272	error:
ae856491 DG	273	if (warn) {
	274	ret = CMD_WARNING;
	275	}
	276
cd80958d DG	277	lttng_destroy_handle(handle);
cd80958d DG	278
d36b8583 DG	279	return ret;
	280	}
	281
	282	/*
0fdd1e2c	283	* Default value for channel configuration.
7d29a247 DG	284	*/
	285	static void init_channel_config(void)
	286	{
5edd7e09 DG	287	/*
	288	* Put -1 everywhere so we can identify those set by the command line and
	289	* those needed to be set by the default values.
	290	*/
	291	memset(&chan.attr, -1, sizeof(chan.attr));
7d29a247 DG	292	}
	293
	294	/*
0fdd1e2c	295	* Add channel to trace session
d36b8583 DG	296	*/
	297	int cmd_enable_channels(int argc, const char **argv)
	298	{
ca1c3607	299	int opt, ret = CMD_SUCCESS;
d36b8583	300	static poptContext pc;
cd80958d	301	char *session_name = NULL;
d36b8583	302
7d29a247 DG	303	init_channel_config();
7d29a247 DG	304
d36b8583 DG	305	pc = poptGetContext(NULL, argc, argv, long_options, 0);
	306	poptReadDefaultConfig(pc, 0);
	307
	308	while ((opt = poptGetNextOpt(pc)) != -1) {
	309	switch (opt) {
	310	case OPT_HELP:
ca1c3607	311	usage(stdout);
d36b8583	312	goto end;
7d29a247 DG	313	case OPT_DISCARD:
	314	chan.attr.overwrite = 0;
	315	DBG("Channel set to discard");
	316	break;
	317	case OPT_OVERWRITE:
	318	chan.attr.overwrite = 1;
	319	DBG("Channel set to overwrite");
	320	break;
	321	case OPT_SUBBUF_SIZE:
ca1c3607	322	/* TODO Replace atol with strtol and check for errors */
7d29a247	323	chan.attr.subbuf_size = atol(poptGetOptArg(pc));
5a0de755	324	DBG("Channel subbuf size set to %" PRIu64, chan.attr.subbuf_size);
7d29a247 DG	325	break;
7d29a247 DG	326	case OPT_NUM_SUBBUF:
ca1c3607	327	/* TODO Replace atoi with strtol and check for errors */
7d29a247	328	chan.attr.num_subbuf = atoi(poptGetOptArg(pc));
5a0de755	329	DBG("Channel subbuf num set to %" PRIu64, chan.attr.num_subbuf);
7d29a247 DG	330	break;
7d29a247 DG	331	case OPT_SWITCH_TIMER:
ca1c3607	332	/* TODO Replace atoi with strtol and check for errors */
7d29a247 DG	333	chan.attr.switch_timer_interval = atoi(poptGetOptArg(pc));
	334	DBG("Channel switch timer interval set to %d", chan.attr.switch_timer_interval);
	335	break;
	336	case OPT_READ_TIMER:
ca1c3607	337	/* TODO Replace atoi with strtol and check for errors */
7d29a247 DG	338	chan.attr.read_timer_interval = atoi(poptGetOptArg(pc));
7d29a247 DG	339	DBG("Channel read timer interval set to %d", chan.attr.read_timer_interval);
d36b8583	340	break;
eeac7d46 MD	341	case OPT_USERSPACE:
eeac7d46 MD	342	opt_userspace = 1;
eeac7d46	343	break;
1624d5b7 JD	344	case OPT_TRACEFILE_SIZE:
	345	chan.attr.tracefile_size = atoll(poptGetOptArg(pc));
	346	DBG("Maximum tracefile size set to %" PRIu64,
	347	chan.attr.tracefile_size);
	348	break;
	349	case OPT_TRACEFILE_COUNT:
	350	chan.attr.tracefile_count = atoll(poptGetOptArg(pc));
	351	DBG("Maximum tracefile count set to %" PRIu64,
	352	chan.attr.tracefile_count);
	353	break;
679b4943 SM	354	case OPT_LIST_OPTIONS:
679b4943 SM	355	list_cmd_options(stdout, long_options);
679b4943	356	goto end;
d36b8583 DG	357	default:
	358	usage(stderr);
	359	ret = CMD_UNDEFINED;
	360	goto end;
	361	}
	362	}
	363
	364	opt_channels = (char*) poptGetArg(pc);
	365	if (opt_channels == NULL) {
7d29a247	366	ERR("Missing channel name.\n");
d36b8583	367	usage(stderr);
ca1c3607	368	ret = CMD_ERROR;
d36b8583 DG	369	goto end;
	370	}
	371
cd80958d DG	372	if (!opt_session_name) {
	373	session_name = get_session_name();
	374	if (session_name == NULL) {
ca1c3607	375	ret = CMD_ERROR;
cd80958d DG	376	goto end;
	377	}
	378	} else {
	379	session_name = opt_session_name;
	380	}
	381
	382	ret = enable_channel(session_name);
d36b8583 DG	383
d36b8583 DG	384	end:
5853fd43 DG	385	if (!opt_session_name && session_name) {
	386	free(session_name);
	387	}
ca1c3607	388	poptFreeContext(pc);
d36b8583 DG	389	return ret;
d36b8583 DG	390	}