[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 <assert.h>
#include <ctype.h>

#include "../command.h"
#include "../utils.h"

#include <src/common/sessiond-comm/sessiond-comm.h>
#include <src/common/utils.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_STRING, 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 {+k,+M,+G}\n");
	fprintf(ofp, "                               (default UST uid: %zu, UST pid: %zu, kernel: %zu, metadata: %zu)\n",
		default_get_ust_uid_channel_subbuf_size(),
		default_get_ust_pid_channel_subbuf_size(),
		default_get_kernel_channel_subbuf_size(),
		default_get_metadata_subbuf_size());
	fprintf(ofp, "                               Rounded up to the next power of 2.\n");
	fprintf(ofp, "      --num-subbuf NUM     Number of subbufers\n");
	fprintf(ofp, "                               (default UST uid: %u, UST pid: %u, kernel: %u, metadata: %u)\n",
		DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM, DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM,
		DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM, DEFAULT_METADATA_SUBBUF_NUM);
	fprintf(ofp, "                               Rounded up to the next power of 2.\n");
	fprintf(ofp, "      --switch-timer USEC  Switch timer interval in usec\n");
	fprintf(ofp, "                               (default UST uid: %u, UST pid: %u, kernel: %u, metadata: %u)\n",
		DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER, DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER,
		DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER, DEFAULT_METADATA_SWITCH_TIMER);
	fprintf(ofp, "      --read-timer USEC    Read timer interval in usec.\n");
	fprintf(ofp, "                               (default UST uid: %u, UST pid: %u, kernel: %u, metadata: %u)\n",
		DEFAULT_UST_UID_CHANNEL_READ_TIMER, DEFAULT_UST_UID_CHANNEL_READ_TIMER,
		DEFAULT_KERNEL_CHANNEL_READ_TIMER, DEFAULT_METADATA_READ_TIMER);
	fprintf(ofp, "      --output TYPE        Channel output type (Values: %s, %s)\n",
			output_mmap, output_splice);
	fprintf(ofp, "                               (default UST uid: %s, UST pid: %s, kernel: %s, metadata: %s)\n",
			DEFAULT_UST_UID_CHANNEL_OUTPUT == LTTNG_EVENT_MMAP ? output_mmap : output_splice,
			DEFAULT_UST_PID_CHANNEL_OUTPUT == LTTNG_EVENT_MMAP ? output_mmap : output_splice,
			DEFAULT_KERNEL_CHANNEL_OUTPUT == LTTNG_EVENT_MMAP ? output_mmap : output_splice,
			DEFAULT_METADATA_OUTPUT == LTTNG_EVENT_MMAP ? 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 each tracefile within a stream (in bytes). 0 means unlimited.\n");
	fprintf(ofp, "                               (default: %u)\n", DEFAULT_CHANNEL_TRACEFILE_SIZE);
	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. 0 means unlimited.\n");
	fprintf(ofp, "                               (default: %u)\n", DEFAULT_CHANNEL_TRACEFILE_COUNT);
	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 ((int) 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_pid) {
			dom.buf_type = LTTNG_BUFFER_PER_PID;
		} else {
			if (opt_buffer_global) {
				ERR("Buffer type not supported for domain -u");
				ret = CMD_ERROR;
				goto error;
			}
			dom.buf_type = LTTNG_BUFFER_PER_UID;
		}
	} else {
		print_missing_domain();
		ret = CMD_ERROR;
		goto error;
	}

	set_default_attr(&dom);

	if (chan.attr.tracefile_size == 0 && chan.attr.tracefile_count) {
		ERR("Missing option --tracefile-size. "
				"A file count without a size won't do anything.");
		ret = CMD_ERROR;
		goto error;
	}

	if ((chan.attr.tracefile_size > 0) &&
			(chan.attr.tracefile_size < chan.attr.subbuf_size)) {
		WARN("Tracefile size rounded up from (%" PRIu64 ") to subbuffer size (%" PRIu64 ")",
				chan.attr.tracefile_size, chan.attr.subbuf_size);
		chan.attr.tracefile_size = chan.attr.subbuf_size;
	}

	/* 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) {
		/* Validate channel name's length */
		if (strlen(channel_name) >= NAME_MAX) {
			ERR("Channel name is too long (max. %zu characters)",
					sizeof(chan.name) - 1);
			ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
			goto error;
		}

		/* Copy channel name */
		strcpy(chan.name, channel_name);

		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:
			case LTTNG_ERR_CHAN_EXIST:
				WARN("Channel %s: %s (session %s)", channel_name,
						lttng_strerror(ret), session_name);
				goto error;
			case LTTNG_ERR_INVALID_CHANNEL_NAME:
				ERR("Invalid channel name: \"%s\". "
				    "Channel names may not start with '.', and "
				    "may not contain '/'.", channel_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",
					get_domain_str(dom.type), channel_name, session_name);
		}

		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;
	char *opt_arg = 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:
		{
			uint64_t rounded_size;
			int order;

			/* Parse the size */
			opt_arg = poptGetOptArg(pc);
			if (utils_parse_size_suffix(opt_arg, &chan.attr.subbuf_size) < 0 || !chan.attr.subbuf_size) {
				ERR("Wrong value in --subbuf-size parameter: %s", opt_arg);
				ret = CMD_ERROR;
				goto end;
			}

			order = get_count_order_u64(chan.attr.subbuf_size);
			assert(order >= 0);
			rounded_size = 1ULL << order;
			if (rounded_size < chan.attr.subbuf_size) {
				ERR("The subbuf size (%" PRIu64 ") is rounded and overflows!",
						chan.attr.subbuf_size);
				ret = CMD_ERROR;
				goto end;
			}

			if (rounded_size != chan.attr.subbuf_size) {
				WARN("The subbuf size (%" PRIu64 ") is rounded to the next power of 2 (%" PRIu64 ")",
						chan.attr.subbuf_size, rounded_size);
				chan.attr.subbuf_size = rounded_size;
			}

			/* Should now be power of 2 */
			assert(!((chan.attr.subbuf_size - 1) & chan.attr.subbuf_size));

			DBG("Channel subbuf size set to %" PRIu64, chan.attr.subbuf_size);
			break;
		}
		case OPT_NUM_SUBBUF:
		{
			uint64_t rounded_size;
			int order;

			errno = 0;
			opt_arg = poptGetOptArg(pc);
			chan.attr.num_subbuf = strtoull(opt_arg, NULL, 0);
			if (errno != 0 || !chan.attr.num_subbuf || !isdigit(opt_arg[0])) {
				ERR("Wrong value in --num-subbuf parameter: %s", opt_arg);
				ret = CMD_ERROR;
				goto end;
			}

			order = get_count_order_u64(chan.attr.num_subbuf);
			assert(order >= 0);
			rounded_size = 1ULL << order;
			if (rounded_size < chan.attr.num_subbuf) {
				ERR("The number of subbuffers (%" PRIu64 ") is rounded and overflows!",
						chan.attr.num_subbuf);
				ret = CMD_ERROR;
				goto end;
			}

			if (rounded_size != chan.attr.num_subbuf) {
				WARN("The number of subbuffers (%" PRIu64 ") is rounded to the next power of 2 (%" PRIu64 ")",
						chan.attr.num_subbuf, rounded_size);
				chan.attr.num_subbuf = rounded_size;
			}

			/* Should now be power of 2 */
			assert(!((chan.attr.num_subbuf - 1) & chan.attr.num_subbuf));

			DBG("Channel subbuf num set to %" PRIu64, chan.attr.num_subbuf);
			break;
		}
		case OPT_SWITCH_TIMER:
		{
			unsigned long v;

			errno = 0;
			opt_arg = poptGetOptArg(pc);
			v = strtoul(opt_arg, NULL, 0);
			if (errno != 0 || !isdigit(opt_arg[0])) {
				ERR("Wrong value in --switch-timer parameter: %s", opt_arg);
				ret = CMD_ERROR;
				goto end;
			}
			if (v != (uint32_t) v) {
				ERR("32-bit overflow in --switch-timer parameter: %s", opt_arg);
				ret = CMD_ERROR;
				goto end;
			}
			chan.attr.switch_timer_interval = (uint32_t) v;
			DBG("Channel switch timer interval set to %d", chan.attr.switch_timer_interval);
			break;
		}
		case OPT_READ_TIMER:
		{
			unsigned long v;

			errno = 0;
			opt_arg = poptGetOptArg(pc);
			v = strtoul(opt_arg, NULL, 0);
			if (errno != 0 || !isdigit(opt_arg[0])) {
				ERR("Wrong value in --read-timer parameter: %s", opt_arg);
				ret = CMD_ERROR;
				goto end;
			}
			if (v != (uint32_t) v) {
				ERR("32-bit overflow in --read-timer parameter: %s", opt_arg);
				ret = CMD_ERROR;
				goto end;
			}
			chan.attr.read_timer_interval = (uint32_t) v;
			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:
			opt_arg = poptGetOptArg(pc);
			if (utils_parse_size_suffix(opt_arg, &chan.attr.tracefile_size) < 0) {
				ERR("Wrong value in --tracefile-size parameter: %s", opt_arg);
				ret = CMD_ERROR;
				goto end;
			}
			DBG("Maximum tracefile size set to %" PRIu64,
					chan.attr.tracefile_size);
			break;
		case OPT_TRACEFILE_COUNT:
		{
			unsigned long v;

			errno = 0;
			opt_arg = poptGetOptArg(pc);
			v = strtoul(opt_arg, NULL, 0);
			if (errno != 0 || !isdigit(opt_arg[0])) {
				ERR("Wrong value in --tracefile-count parameter: %s", opt_arg);
				ret = CMD_ERROR;
				goto end;
			}
			if (v != (uint32_t) v) {
				ERR("32-bit overflow in --tracefile-count parameter: %s", opt_arg);
				ret = CMD_ERROR;
				goto end;
			}
			chan.attr.tracefile_count = (uint32_t) v;
			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>
1cb514ce MD	27	#include <assert.h>
1cb514ce MD	28	#include <ctype.h>
d36b8583	29
c399183f	30	#include "../command.h"
1cb514ce	31	#include "../utils.h"
d36b8583	32
42224349	33	#include <src/common/sessiond-comm/sessiond-comm.h>
70d0b120	34	#include <src/common/utils.h>
42224349	35
d36b8583	36	static char *opt_channels;
5edd7e09	37	static int opt_kernel;
5440dc42	38	static char *opt_session_name;
d36b8583	39	static int opt_userspace;
d78d6610	40	static struct lttng_channel chan;
a79d84dd	41	static char *opt_output;
7972aab2 DG	42	static int opt_buffer_uid;
	43	static int opt_buffer_pid;
	44	static int opt_buffer_global;
d36b8583 DG	45
	46	enum {
	47	OPT_HELP = 1,
7d29a247 DG	48	OPT_DISCARD,
	49	OPT_OVERWRITE,
	50	OPT_SUBBUF_SIZE,
	51	OPT_NUM_SUBBUF,
	52	OPT_SWITCH_TIMER,
	53	OPT_READ_TIMER,
d36b8583	54	OPT_USERSPACE,
679b4943	55	OPT_LIST_OPTIONS,
1624d5b7 JD	56	OPT_TRACEFILE_SIZE,
1624d5b7 JD	57	OPT_TRACEFILE_COUNT,
d36b8583 DG	58	};
d36b8583 DG	59
cd80958d DG	60	static struct lttng_handle *handle;
cd80958d DG	61
a79d84dd DG	62	const char *output_mmap = "mmap";
	63	const char *output_splice = "splice";
	64
d36b8583 DG	65	static struct poptOption long_options[] = {
	66	/* longName, shortName, argInfo, argPtr, value, descrip, argDesc */
	67	{"help", 'h', POPT_ARG_NONE, 0, OPT_HELP, 0, 0},
5440dc42	68	{"session", 's', POPT_ARG_STRING, &opt_session_name, 0, 0, 0},
d36b8583	69	{"kernel", 'k', POPT_ARG_VAL, &opt_kernel, 1, 0, 0},
d78d6610	70	{"userspace", 'u', POPT_ARG_NONE, 0, OPT_USERSPACE, 0, 0},
7d29a247 DG	71	{"discard", 0, POPT_ARG_NONE, 0, OPT_DISCARD, 0, 0},
7d29a247 DG	72	{"overwrite", 0, POPT_ARG_NONE, 0, OPT_OVERWRITE, 0, 0},
70d0b120	73	{"subbuf-size", 0, POPT_ARG_STRING, 0, OPT_SUBBUF_SIZE, 0, 0},
1b579521 DG	74	{"num-subbuf", 0, POPT_ARG_INT, 0, OPT_NUM_SUBBUF, 0, 0},
	75	{"switch-timer", 0, POPT_ARG_INT, 0, OPT_SWITCH_TIMER, 0, 0},
	76	{"read-timer", 0, POPT_ARG_INT, 0, OPT_READ_TIMER, 0, 0},
679b4943	77	{"list-options", 0, POPT_ARG_NONE, NULL, OPT_LIST_OPTIONS, NULL, NULL},
a79d84dd	78	{"output", 0, POPT_ARG_STRING, &opt_output, 0, 0, 0},
7972aab2 DG	79	{"buffers-uid", 0, POPT_ARG_VAL, &opt_buffer_uid, 1, 0, 0},
	80	{"buffers-pid", 0, POPT_ARG_VAL, &opt_buffer_pid, 1, 0, 0},
	81	{"buffers-global", 0, POPT_ARG_VAL, &opt_buffer_global, 1, 0, 0},
1624d5b7 JD	82	{"tracefile-size", 'C', POPT_ARG_INT, 0, OPT_TRACEFILE_SIZE, 0, 0},
1624d5b7 JD	83	{"tracefile-count", 'W', POPT_ARG_INT, 0, OPT_TRACEFILE_COUNT, 0, 0},
d36b8583 DG	84	{0, 0, 0, 0, 0, 0, 0}
	85	};
	86
	87	/*
	88	* usage
	89	*/
	90	static void usage(FILE *ofp)
	91	{
05be3802	92	fprintf(ofp, "usage: lttng enable-channel NAME[,NAME2,...] (-u \| -k) [OPTIONS]\n");
d36b8583	93	fprintf(ofp, "\n");
32a6298d	94	fprintf(ofp, "Options:\n");
7d29a247	95	fprintf(ofp, " -h, --help Show this help\n");
679b4943	96	fprintf(ofp, " --list-options Simple listing of options\n");
32a6298d	97	fprintf(ofp, " -s, --session NAME Apply to session name\n");
27221701	98	fprintf(ofp, " -k, --kernel Apply to the kernel tracer\n");
27221701	99	fprintf(ofp, " -u, --userspace Apply to the user-space tracer\n");
7d29a247 DG	100	fprintf(ofp, "\n");
7d29a247 DG	101	fprintf(ofp, "Channel options:\n");
cabd9892 MD	102	fprintf(ofp, " --discard Discard event when buffers are full%s\n",
	103	DEFAULT_CHANNEL_OVERWRITE ? "" : " (default)");
	104	fprintf(ofp, " --overwrite Flight recorder mode%s\n",
	105	DEFAULT_CHANNEL_OVERWRITE ? " (default)" : "");
70d0b120	106	fprintf(ofp, " --subbuf-size SIZE Subbuffer size in bytes {+k,+M,+G}\n");
0a9c6494 DG	107	fprintf(ofp, " (default UST uid: %zu, UST pid: %zu, kernel: %zu, metadata: %zu)\n",
	108	default_get_ust_uid_channel_subbuf_size(),
	109	default_get_ust_pid_channel_subbuf_size(),
	110	default_get_kernel_channel_subbuf_size(),
	111	default_get_metadata_subbuf_size());
1cb514ce	112	fprintf(ofp, " Rounded up to the next power of 2.\n");
cc62c0c0	113	fprintf(ofp, " --num-subbuf NUM Number of subbufers\n");
0a9c6494 DG	114	fprintf(ofp, " (default UST uid: %u, UST pid: %u, kernel: %u, metadata: %u)\n",
	115	DEFAULT_UST_UID_CHANNEL_SUBBUF_NUM, DEFAULT_UST_PID_CHANNEL_SUBBUF_NUM,
	116	DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM, DEFAULT_METADATA_SUBBUF_NUM);
1cb514ce	117	fprintf(ofp, " Rounded up to the next power of 2.\n");
0a9c6494 DG	118	fprintf(ofp, " --switch-timer USEC Switch timer interval in usec\n");
	119	fprintf(ofp, " (default UST uid: %u, UST pid: %u, kernel: %u, metadata: %u)\n",
	120	DEFAULT_UST_UID_CHANNEL_SWITCH_TIMER, DEFAULT_UST_PID_CHANNEL_SWITCH_TIMER,
	121	DEFAULT_KERNEL_CHANNEL_SWITCH_TIMER, DEFAULT_METADATA_SWITCH_TIMER);
	122	fprintf(ofp, " --read-timer USEC Read timer interval in usec.\n");
	123	fprintf(ofp, " (default UST uid: %u, UST pid: %u, kernel: %u, metadata: %u)\n",
	124	DEFAULT_UST_UID_CHANNEL_READ_TIMER, DEFAULT_UST_UID_CHANNEL_READ_TIMER,
	125	DEFAULT_KERNEL_CHANNEL_READ_TIMER, DEFAULT_METADATA_READ_TIMER);
a79d84dd DG	126	fprintf(ofp, " --output TYPE Channel output type (Values: %s, %s)\n",
a79d84dd DG	127	output_mmap, output_splice);
0a9c6494 DG	128	fprintf(ofp, " (default UST uid: %s, UST pid: %s, kernel: %s, metadata: %s)\n",
	129	DEFAULT_UST_UID_CHANNEL_OUTPUT == LTTNG_EVENT_MMAP ? output_mmap : output_splice,
	130	DEFAULT_UST_PID_CHANNEL_OUTPUT == LTTNG_EVENT_MMAP ? output_mmap : output_splice,
	131	DEFAULT_KERNEL_CHANNEL_OUTPUT == LTTNG_EVENT_MMAP ? output_mmap : output_splice,
	132	DEFAULT_METADATA_OUTPUT == LTTNG_EVENT_MMAP ? output_mmap : output_splice);
3b831a2d DG	133	fprintf(ofp, " --buffers-uid Use per UID buffer (-u only)\n");
3b831a2d DG	134	fprintf(ofp, " --buffers-pid Use per PID buffer (-u only)\n");
7972aab2	135	fprintf(ofp, " --buffers-global Use shared buffer for the whole system (-k only)\n");
1624d5b7	136	fprintf(ofp, " -C, --tracefile-size SIZE\n");
0a9c6494 DG	137	fprintf(ofp, " Maximum size of each tracefile within a stream (in bytes). 0 means unlimited.\n");
0a9c6494 DG	138	fprintf(ofp, " (default: %u)\n", DEFAULT_CHANNEL_TRACEFILE_SIZE);
1624d5b7 JD	139	fprintf(ofp, " -W, --tracefile-count COUNT\n");
1624d5b7 JD	140	fprintf(ofp, " Used in conjunction with -C option, this will limit the number\n");
0a9c6494 DG	141	fprintf(ofp, " of files created to the specified count. 0 means unlimited.\n");
0a9c6494 DG	142	fprintf(ofp, " (default: %u)\n", DEFAULT_CHANNEL_TRACEFILE_COUNT);
d36b8583 DG	143	fprintf(ofp, "\n");
	144	}
	145
5edd7e09 DG	146	/*
	147	* Set default attributes depending on those already defined from the command
	148	* line.
	149	*/
	150	static void set_default_attr(struct lttng_domain *dom)
	151	{
	152	struct lttng_channel_attr default_attr;
	153
	154	/* Set attributes */
	155	lttng_channel_set_default_attr(dom, &default_attr);
	156
	157	if (chan.attr.overwrite == -1) {
	158	chan.attr.overwrite = default_attr.overwrite;
	159	}
	160	if (chan.attr.subbuf_size == -1) {
	161	chan.attr.subbuf_size = default_attr.subbuf_size;
	162	}
	163	if (chan.attr.num_subbuf == -1) {
	164	chan.attr.num_subbuf = default_attr.num_subbuf;
	165	}
	166	if (chan.attr.switch_timer_interval == -1) {
	167	chan.attr.switch_timer_interval = default_attr.switch_timer_interval;
	168	}
	169	if (chan.attr.read_timer_interval == -1) {
	170	chan.attr.read_timer_interval = default_attr.read_timer_interval;
	171	}
49f9c814	172	if ((int) chan.attr.output == -1) {
5edd7e09 DG	173	chan.attr.output = default_attr.output;
5edd7e09 DG	174	}
1624d5b7 JD	175	if (chan.attr.tracefile_count == -1) {
	176	chan.attr.tracefile_count = default_attr.tracefile_count;
	177	}
	178	if (chan.attr.tracefile_size == -1) {
	179	chan.attr.tracefile_size = default_attr.tracefile_size;
	180	}
5edd7e09 DG	181	}
5edd7e09 DG	182
d36b8583	183	/*
0fdd1e2c	184	* Adding channel using the lttng API.
d36b8583	185	*/
cd80958d	186	static int enable_channel(char *session_name)
d36b8583	187	{
ae856491	188	int ret = CMD_SUCCESS, warn = 0;
d36b8583	189	char *channel_name;
7d29a247	190	struct lttng_domain dom;
d36b8583	191
441c16a7 MD	192	memset(&dom, 0, sizeof(dom));
441c16a7 MD	193
d78d6610	194	/* Create lttng domain */
7d29a247 DG	195	if (opt_kernel) {
7d29a247 DG	196	dom.type = LTTNG_DOMAIN_KERNEL;
7972aab2	197	dom.buf_type = LTTNG_BUFFER_GLOBAL;
88c5f0d8 DG	198	if (opt_buffer_uid \|\| opt_buffer_pid) {
	199	ERR("Buffer type not supported for domain -k");
	200	ret = CMD_ERROR;
	201	goto error;
	202	}
d78d6610	203	} else if (opt_userspace) {
f6a9efaa	204	dom.type = LTTNG_DOMAIN_UST;
8692d4e5 DG	205	if (opt_buffer_pid) {
8692d4e5 DG	206	dom.buf_type = LTTNG_BUFFER_PER_PID;
7972aab2	207	} else {
88c5f0d8 DG	208	if (opt_buffer_global) {
	209	ERR("Buffer type not supported for domain -u");
	210	ret = CMD_ERROR;
	211	goto error;
	212	}
8692d4e5	213	dom.buf_type = LTTNG_BUFFER_PER_UID;
7972aab2	214	}
0fdd1e2c	215	} else {
b9dfb167	216	print_missing_domain();
d16c1a4c	217	ret = CMD_ERROR;
0fdd1e2c	218	goto error;
7d29a247 DG	219	}
7d29a247 DG	220
5edd7e09 DG	221	set_default_attr(&dom);
5edd7e09 DG	222
d16dee89 DG	223	if (chan.attr.tracefile_size == 0 && chan.attr.tracefile_count) {
	224	ERR("Missing option --tracefile-size. "
	225	"A file count without a size won't do anything.");
	226	ret = CMD_ERROR;
	227	goto error;
	228	}
	229
1624d5b7 JD	230	if ((chan.attr.tracefile_size > 0) &&
1624d5b7 JD	231	(chan.attr.tracefile_size < chan.attr.subbuf_size)) {
de65565a	232	WARN("Tracefile size rounded up from (%" PRIu64 ") to subbuffer size (%" PRIu64 ")",
1624d5b7	233	chan.attr.tracefile_size, chan.attr.subbuf_size);
de65565a	234	chan.attr.tracefile_size = chan.attr.subbuf_size;
1624d5b7 JD	235	}
1624d5b7 JD	236
a79d84dd DG	237	/* Setting channel output */
	238	if (opt_output) {
	239	if (!strncmp(output_mmap, opt_output, strlen(output_mmap))) {
	240	chan.attr.output = LTTNG_EVENT_MMAP;
	241	} else if (!strncmp(output_splice, opt_output, strlen(output_splice))) {
	242	chan.attr.output = LTTNG_EVENT_SPLICE;
	243	} else {
	244	ERR("Unknown output type %s. Possible values are: %s, %s\n",
	245	opt_output, output_mmap, output_splice);
	246	usage(stderr);
	247	ret = CMD_ERROR;
	248	goto error;
	249	}
	250	}
	251
cd80958d DG	252	handle = lttng_create_handle(session_name, &dom);
	253	if (handle == NULL) {
	254	ret = -1;
	255	goto error;
	256	}
	257
0fdd1e2c	258	/* Strip channel list (format: chan1,chan2,...) */
d36b8583 DG	259	channel_name = strtok(opt_channels, ",");
d36b8583 DG	260	while (channel_name != NULL) {
1ea29ffd PP	261	/* Validate channel name's length */
	262	if (strlen(channel_name) >= NAME_MAX) {
	263	ERR("Channel name is too long (max. %zu characters)",
	264	sizeof(chan.name) - 1);
	265	ret = LTTNG_ERR_INVALID_CHANNEL_NAME;
	266	goto error;
	267	}
	268
	269	/* Copy channel name */
	270	strcpy(chan.name, channel_name);
0fdd1e2c DG	271
	272	DBG("Enabling channel %s", channel_name);
	273
	274	ret = lttng_enable_channel(handle, &chan);
	275	if (ret < 0) {
42224349	276	switch (-ret) {
f73fabfd DG	277	case LTTNG_ERR_KERN_CHAN_EXIST:
f73fabfd DG	278	case LTTNG_ERR_UST_CHAN_EXIST:
b9dfb167	279	case LTTNG_ERR_CHAN_EXIST:
88c5f0d8	280	WARN("Channel %s: %s (session %s)", channel_name,
42224349 DG	281	lttng_strerror(ret), session_name);
42224349 DG	282	goto error;
1ea29ffd PP	283	case LTTNG_ERR_INVALID_CHANNEL_NAME:
	284	ERR("Invalid channel name: \"%s\". "
	285	"Channel names may not start with '.', and "
	286	"may not contain '/'.", channel_name);
	287	goto error;
42224349 DG	288	default:
	289	ERR("Channel %s: %s (session %s)", channel_name,
	290	lttng_strerror(ret), session_name);
	291	break;
	292	}
ae856491	293	warn = 1;
d36b8583	294	} else {
7885e399	295	MSG("%s channel %s enabled for session %s",
b9dfb167	296	get_domain_str(dom.type), channel_name, session_name);
d36b8583 DG	297	}
d36b8583 DG	298
d36b8583 DG	299	channel_name = strtok(NULL, ",");
	300	}
	301
ae856491 DG	302	ret = CMD_SUCCESS;
ae856491 DG	303
d36b8583	304	error:
ae856491 DG	305	if (warn) {
	306	ret = CMD_WARNING;
	307	}
	308
cd80958d DG	309	lttng_destroy_handle(handle);
cd80958d DG	310
d36b8583 DG	311	return ret;
	312	}
	313
	314	/*
0fdd1e2c	315	* Default value for channel configuration.
7d29a247 DG	316	*/
	317	static void init_channel_config(void)
	318	{
5edd7e09 DG	319	/*
	320	* Put -1 everywhere so we can identify those set by the command line and
	321	* those needed to be set by the default values.
	322	*/
	323	memset(&chan.attr, -1, sizeof(chan.attr));
7d29a247 DG	324	}
	325
	326	/*
0fdd1e2c	327	* Add channel to trace session
d36b8583 DG	328	*/
	329	int cmd_enable_channels(int argc, const char **argv)
	330	{
ca1c3607	331	int opt, ret = CMD_SUCCESS;
d36b8583	332	static poptContext pc;
cd80958d	333	char *session_name = NULL;
70d0b120	334	char *opt_arg = NULL;
d36b8583	335
7d29a247 DG	336	init_channel_config();
7d29a247 DG	337
d36b8583 DG	338	pc = poptGetContext(NULL, argc, argv, long_options, 0);
	339	poptReadDefaultConfig(pc, 0);
	340
	341	while ((opt = poptGetNextOpt(pc)) != -1) {
	342	switch (opt) {
	343	case OPT_HELP:
ca1c3607	344	usage(stdout);
d36b8583	345	goto end;
7d29a247 DG	346	case OPT_DISCARD:
	347	chan.attr.overwrite = 0;
	348	DBG("Channel set to discard");
	349	break;
	350	case OPT_OVERWRITE:
	351	chan.attr.overwrite = 1;
	352	DBG("Channel set to overwrite");
	353	break;
	354	case OPT_SUBBUF_SIZE:
1cb514ce MD	355	{
	356	uint64_t rounded_size;
	357	int order;
	358
70d0b120 SM	359	/* Parse the size */
70d0b120 SM	360	opt_arg = poptGetOptArg(pc);
1cb514ce MD	361	if (utils_parse_size_suffix(opt_arg, &chan.attr.subbuf_size) < 0 \|\| !chan.attr.subbuf_size) {
1cb514ce MD	362	ERR("Wrong value in --subbuf-size parameter: %s", opt_arg);
70d0b120 SM	363	ret = CMD_ERROR;
	364	goto end;
	365	}
	366
1cb514ce MD	367	order = get_count_order_u64(chan.attr.subbuf_size);
	368	assert(order >= 0);
	369	rounded_size = 1ULL << order;
06c0da96 DG	370	if (rounded_size < chan.attr.subbuf_size) {
	371	ERR("The subbuf size (%" PRIu64 ") is rounded and overflows!",
	372	chan.attr.subbuf_size);
	373	ret = CMD_ERROR;
	374	goto end;
	375	}
	376
1cb514ce MD	377	if (rounded_size != chan.attr.subbuf_size) {
	378	WARN("The subbuf size (%" PRIu64 ") is rounded to the next power of 2 (%" PRIu64 ")",
	379	chan.attr.subbuf_size, rounded_size);
	380	chan.attr.subbuf_size = rounded_size;
70d0b120 SM	381	}
70d0b120 SM	382
1cb514ce MD	383	/* Should now be power of 2 */
	384	assert(!((chan.attr.subbuf_size - 1) & chan.attr.subbuf_size));
	385
5a0de755	386	DBG("Channel subbuf size set to %" PRIu64, chan.attr.subbuf_size);
7d29a247	387	break;
1cb514ce	388	}
7d29a247	389	case OPT_NUM_SUBBUF:
1cb514ce MD	390	{
	391	uint64_t rounded_size;
	392	int order;
	393
16068db5	394	errno = 0;
1cb514ce MD	395	opt_arg = poptGetOptArg(pc);
	396	chan.attr.num_subbuf = strtoull(opt_arg, NULL, 0);
	397	if (errno != 0 \|\| !chan.attr.num_subbuf \|\| !isdigit(opt_arg[0])) {
	398	ERR("Wrong value in --num-subbuf parameter: %s", opt_arg);
16068db5 MD	399	ret = CMD_ERROR;
	400	goto end;
	401	}
	402
1cb514ce MD	403	order = get_count_order_u64(chan.attr.num_subbuf);
	404	assert(order >= 0);
	405	rounded_size = 1ULL << order;
e123b80c	406	if (rounded_size < chan.attr.num_subbuf) {
06c0da96 DG	407	ERR("The number of subbuffers (%" PRIu64 ") is rounded and overflows!",
	408	chan.attr.num_subbuf);
	409	ret = CMD_ERROR;
	410	goto end;
	411	}
	412
1cb514ce MD	413	if (rounded_size != chan.attr.num_subbuf) {
	414	WARN("The number of subbuffers (%" PRIu64 ") is rounded to the next power of 2 (%" PRIu64 ")",
	415	chan.attr.num_subbuf, rounded_size);
	416	chan.attr.num_subbuf = rounded_size;
	417	}
	418
	419	/* Should now be power of 2 */
	420	assert(!((chan.attr.num_subbuf - 1) & chan.attr.num_subbuf));
	421
5a0de755	422	DBG("Channel subbuf num set to %" PRIu64, chan.attr.num_subbuf);
7d29a247	423	break;
1cb514ce	424	}
7d29a247	425	case OPT_SWITCH_TIMER:
16068db5 MD	426	{
	427	unsigned long v;
	428
	429	errno = 0;
1cb514ce MD	430	opt_arg = poptGetOptArg(pc);
	431	v = strtoul(opt_arg, NULL, 0);
	432	if (errno != 0 \|\| !isdigit(opt_arg[0])) {
	433	ERR("Wrong value in --switch-timer parameter: %s", opt_arg);
16068db5 MD	434	ret = CMD_ERROR;
	435	goto end;
	436	}
	437	if (v != (uint32_t) v) {
	438	ERR("32-bit overflow in --switch-timer parameter: %s", opt_arg);
	439	ret = CMD_ERROR;
	440	goto end;
	441	}
	442	chan.attr.switch_timer_interval = (uint32_t) v;
7d29a247 DG	443	DBG("Channel switch timer interval set to %d", chan.attr.switch_timer_interval);
7d29a247 DG	444	break;
16068db5	445	}
7d29a247	446	case OPT_READ_TIMER:
16068db5 MD	447	{
	448	unsigned long v;
	449
	450	errno = 0;
1cb514ce MD	451	opt_arg = poptGetOptArg(pc);
	452	v = strtoul(opt_arg, NULL, 0);
	453	if (errno != 0 \|\| !isdigit(opt_arg[0])) {
	454	ERR("Wrong value in --read-timer parameter: %s", opt_arg);
16068db5 MD	455	ret = CMD_ERROR;
	456	goto end;
	457	}
	458	if (v != (uint32_t) v) {
	459	ERR("32-bit overflow in --read-timer parameter: %s", opt_arg);
	460	ret = CMD_ERROR;
	461	goto end;
	462	}
	463	chan.attr.read_timer_interval = (uint32_t) v;
7d29a247	464	DBG("Channel read timer interval set to %d", chan.attr.read_timer_interval);
d36b8583	465	break;
16068db5	466	}
eeac7d46 MD	467	case OPT_USERSPACE:
eeac7d46 MD	468	opt_userspace = 1;
eeac7d46	469	break;
1624d5b7	470	case OPT_TRACEFILE_SIZE:
1cb514ce	471	opt_arg = poptGetOptArg(pc);
16068db5	472	if (utils_parse_size_suffix(opt_arg, &chan.attr.tracefile_size) < 0) {
1cb514ce	473	ERR("Wrong value in --tracefile-size parameter: %s", opt_arg);
16068db5 MD	474	ret = CMD_ERROR;
	475	goto end;
	476	}
1624d5b7 JD	477	DBG("Maximum tracefile size set to %" PRIu64,
	478	chan.attr.tracefile_size);
	479	break;
	480	case OPT_TRACEFILE_COUNT:
16068db5 MD	481	{
	482	unsigned long v;
	483
	484	errno = 0;
1cb514ce MD	485	opt_arg = poptGetOptArg(pc);
	486	v = strtoul(opt_arg, NULL, 0);
	487	if (errno != 0 \|\| !isdigit(opt_arg[0])) {
	488	ERR("Wrong value in --tracefile-count parameter: %s", opt_arg);
16068db5 MD	489	ret = CMD_ERROR;
	490	goto end;
	491	}
	492	if (v != (uint32_t) v) {
	493	ERR("32-bit overflow in --tracefile-count parameter: %s", opt_arg);
	494	ret = CMD_ERROR;
	495	goto end;
	496	}
	497	chan.attr.tracefile_count = (uint32_t) v;
1624d5b7 JD	498	DBG("Maximum tracefile count set to %" PRIu64,
	499	chan.attr.tracefile_count);
	500	break;
16068db5	501	}
679b4943 SM	502	case OPT_LIST_OPTIONS:
679b4943 SM	503	list_cmd_options(stdout, long_options);
679b4943	504	goto end;
d36b8583 DG	505	default:
	506	usage(stderr);
	507	ret = CMD_UNDEFINED;
	508	goto end;
	509	}
	510	}
	511
	512	opt_channels = (char*) poptGetArg(pc);
	513	if (opt_channels == NULL) {
7d29a247	514	ERR("Missing channel name.\n");
d36b8583	515	usage(stderr);
ca1c3607	516	ret = CMD_ERROR;
d36b8583 DG	517	goto end;
	518	}
	519
cd80958d DG	520	if (!opt_session_name) {
	521	session_name = get_session_name();
	522	if (session_name == NULL) {
ca1c3607	523	ret = CMD_ERROR;
cd80958d DG	524	goto end;
	525	}
	526	} else {
	527	session_name = opt_session_name;
	528	}
	529
	530	ret = enable_channel(session_name);
d36b8583 DG	531
d36b8583 DG	532	end:
5853fd43 DG	533	if (!opt_session_name && session_name) {
	534	free(session_name);
	535	}
ca1c3607	536	poptFreeContext(pc);
d36b8583 DG	537	return ret;
d36b8583 DG	538	}