[lttng-tools.git] / lttng-consumerd / lttng-consumerd.c

/*
 * Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
 *                      Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
 *
 * 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 <fcntl.h>
#include <getopt.h>
#include <grp.h>
#include <limits.h>
#include <pthread.h>
#include <signal.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/ipc.h>
#include <sys/shm.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <urcu/list.h>
#include <poll.h>
#include <unistd.h>
#include <sys/mman.h>
#include <assert.h>
#include <config.h>
#include <urcu/compiler.h>

#include <lttng-consumerd.h>
#include <lttng-kernel-ctl.h>
#include <lttng-sessiond-comm.h>
#include <lttng/lttng-kconsumer.h>
#include <lttng/lttng-ustconsumer.h>
#include <lttngerr.h>

/* TODO : support UST (all direct kernctl accesses). */

/* the two threads (receive fd and poll) */
static pthread_t threads[2];

/* to count the number of time the user pressed ctrl+c */
static int sigintcount = 0;

/* Argument variables */
int opt_quiet;
int opt_verbose;
static int opt_daemon;
static const char *progname;
static char command_sock_path[PATH_MAX]; /* Global command socket path */
static char error_sock_path[PATH_MAX]; /* Global error path */
static enum lttng_consumer_type opt_type = LTTNG_CONSUMER_KERNEL;

/* the liblttngconsumerd context */
static struct lttng_consumer_local_data *ctx;

/*
 * Signal handler for the daemon
 */
static void sighandler(int sig)
{
	if (sig == SIGINT && sigintcount++ == 0) {
		DBG("ignoring first SIGINT");
		return;
	}

	lttng_consumer_should_exit(ctx);
}

/*
 * Setup signal handler for :
 *      SIGINT, SIGTERM, SIGPIPE
 */
static int set_signal_handler(void)
{
	int ret = 0;
	struct sigaction sa;
	sigset_t sigset;

	if ((ret = sigemptyset(&sigset)) < 0) {
		perror("sigemptyset");
		return ret;
	}

	sa.sa_handler = sighandler;
	sa.sa_mask = sigset;
	sa.sa_flags = 0;
	if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
		perror("sigaction");
		return ret;
	}

	if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
		perror("sigaction");
		return ret;
	}

	if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
		perror("sigaction");
		return ret;
	}

	return ret;
}

/*
 * usage function on stderr
 */
static void usage(void)
{
	fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
	fprintf(stderr, "  -h, --help                         "
			"Display this usage.\n");
	fprintf(stderr, "  -c, --consumerd-cmd-sock PATH     "
			"Specify path for the command socket\n");
	fprintf(stderr, "  -e, --consumerd-err-sock PATH     "
			"Specify path for the error socket\n");
	fprintf(stderr, "  -d, --daemonize                    "
			"Start as a daemon.\n");
	fprintf(stderr, "  -q, --quiet                        "
			"No output at all.\n");
	fprintf(stderr, "  -v, --verbose                      "
			"Verbose mode. Activate DBG() macro.\n");
	fprintf(stderr, "  -V, --version                      "
			"Show version number.\n");
	fprintf(stderr, "  -k, --kernel                       "
			"Consumer kernel buffers (default).\n");
	fprintf(stderr, "  -u, --ust                          "
			"Consumer UST buffers.%s\n",
#ifdef HAVE_LIBLTTNG_UST_CTL
			""
#else
			" (support not compiled in)"
#endif
			);
}

/*
 * daemon argument parsing
 */
static void parse_args(int argc, char **argv)
{
	int c;

	static struct option long_options[] = {
		{ "consumerd-cmd-sock", 1, 0, 'c' },
		{ "consumerd-err-sock", 1, 0, 'e' },
		{ "daemonize", 0, 0, 'd' },
		{ "help", 0, 0, 'h' },
		{ "quiet", 0, 0, 'q' },
		{ "verbose", 0, 0, 'v' },
		{ "version", 0, 0, 'V' },
		{ "kernel", 0, 0, 'k' },
#ifdef HAVE_LIBLTTNG_UST_CTL
		{ "ust", 0, 0, 'u' },
#endif
		{ NULL, 0, 0, 0 }
	};

	while (1) {
		int option_index = 0;
		c = getopt_long(argc, argv, "dhqvVku" "c:e:", long_options, &option_index);
		if (c == -1) {
			break;
		}

		switch (c) {
		case 0:
			fprintf(stderr, "option %s", long_options[option_index].name);
			if (optarg) {
				fprintf(stderr, " with arg %s\n", optarg);
			}
			break;
		case 'c':
			snprintf(command_sock_path, PATH_MAX, "%s", optarg);
			break;
		case 'e':
			snprintf(error_sock_path, PATH_MAX, "%s", optarg);
			break;
		case 'd':
			opt_daemon = 1;
			break;
		case 'h':
			usage();
			exit(EXIT_FAILURE);
		case 'q':
			opt_quiet = 1;
			break;
		case 'v':
			opt_verbose = 1;
			break;
		case 'V':
			fprintf(stdout, "%s\n", VERSION);
			exit(EXIT_SUCCESS);
		case 'k':
			opt_type = LTTNG_CONSUMER_KERNEL;
			break;
#ifdef HAVE_LIBLTTNG_UST_CTL
		case 'u':
# if (CAA_BITS_PER_LONG == 64)
			opt_type = LTTNG_CONSUMER64_UST;
# elif (CAA_BITS_PER_LONG == 32)
			opt_type = LTTNG_CONSUMER32_UST;
# else
#  error "Unknown bitness"
# endif
			break;
#endif
		default:
			usage();
			exit(EXIT_FAILURE);
		}
	}
}

/*
 * main
 */
int main(int argc, char **argv)
{
	int i;
	int ret = 0;
	void *status;

	/* Parse arguments */
	progname = argv[0];
	parse_args(argc, argv);

	/* Daemonize */
	if (opt_daemon) {
		ret = daemon(0, 0);
		if (ret < 0) {
			perror("daemon");
			goto error;
		}
	}

	if (strlen(command_sock_path) == 0) {
		switch (opt_type) {
		case LTTNG_CONSUMER_KERNEL:
			snprintf(command_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH,
					LTTNG_RUNDIR);
			break;
		case LTTNG_CONSUMER64_UST:
			snprintf(command_sock_path, PATH_MAX,
					USTCONSUMERD64_CMD_SOCK_PATH, LTTNG_RUNDIR);
			break;
		case LTTNG_CONSUMER32_UST:
			snprintf(command_sock_path, PATH_MAX,
					USTCONSUMERD32_CMD_SOCK_PATH, LTTNG_RUNDIR);
			break;
		default:
			WARN("Unknown consumerd type");
			goto error;
		}
	}

	/* Init */
	lttng_consumer_init();

	/* create the consumer instance with and assign the callbacks */
	ctx = lttng_consumer_create(opt_type, lttng_consumer_read_subbuffer,
		NULL, lttng_consumer_on_recv_stream, NULL);
	if (ctx == NULL) {
		goto error;
	}

	lttng_consumer_set_command_sock_path(ctx, command_sock_path);
	if (strlen(error_sock_path) == 0) {
		switch (opt_type) {
		case LTTNG_CONSUMER_KERNEL:
			snprintf(error_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH,
					LTTNG_RUNDIR);
			break;
		case LTTNG_CONSUMER64_UST:
			snprintf(error_sock_path, PATH_MAX,
					USTCONSUMERD64_ERR_SOCK_PATH, LTTNG_RUNDIR);
			break;
		case LTTNG_CONSUMER32_UST:
			snprintf(error_sock_path, PATH_MAX,
					USTCONSUMERD32_ERR_SOCK_PATH, LTTNG_RUNDIR);
			break;
		default:
			WARN("Unknown consumerd type");
			goto error;
		}
	}

	if (set_signal_handler() < 0) {
		goto error;
	}

	/* Connect to the socket created by lttng-sessiond to report errors */
	DBG("Connecting to error socket %s", error_sock_path);
	ret = lttcomm_connect_unix_sock(error_sock_path);
	/* not a fatal error, but all communication with lttng-sessiond will fail */
	if (ret < 0) {
		WARN("Cannot connect to error socket, is lttng-sessiond started ?");
	}
	lttng_consumer_set_error_sock(ctx, ret);

	/* Create the thread to manage the receive of fd */
	ret = pthread_create(&threads[0], NULL, lttng_consumer_thread_receive_fds,
			(void *) ctx);
	if (ret != 0) {
		perror("pthread_create");
		goto error;
	}

	/* Create thread to manage the polling/writing of traces */
	ret = pthread_create(&threads[1], NULL, lttng_consumer_thread_poll_fds,
			(void *) ctx);
	if (ret != 0) {
		perror("pthread_create");
		goto error;
	}

	for (i = 0; i < 2; i++) {
		ret = pthread_join(threads[i], &status);
		if (ret != 0) {
			perror("pthread_join");
			goto error;
		}
	}
	ret = EXIT_SUCCESS;
	lttng_consumer_send_error(ctx, CONSUMERD_EXIT_SUCCESS);
	goto end;

error:
	ret = EXIT_FAILURE;
	lttng_consumer_send_error(ctx, CONSUMERD_EXIT_FAILURE);

end:
	lttng_consumer_destroy(ctx);
	lttng_consumer_cleanup();

	return ret;
}
Commit	Line	Data
	1	/*
	2	* Copyright (C) 2011 - Julien Desfossez <julien.desfossez@polymtl.ca>
	3	* Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
	4	*
	5	* This program is free software; you can redistribute it and/or
	6	* modify it under the terms of the GNU General Public License
	7	* as published by the Free Software Foundation; only version 2
	8	* of the License.
	9	*
	10	* This program is distributed in the hope that it will be useful,
	11	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	12	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	13	* GNU General Public License for more details.
	14	*
	15	* You should have received a copy of the GNU General Public License
	16	* along with this program; if not, write to the Free Software
	17	* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
	18	*/
	19
	20	#define _GNU_SOURCE
	21	#include <fcntl.h>
	22	#include <getopt.h>
	23	#include <grp.h>
	24	#include <limits.h>
	25	#include <pthread.h>
	26	#include <signal.h>
	27	#include <stdio.h>
	28	#include <stdlib.h>
	29	#include <string.h>
	30	#include <sys/ipc.h>
	31	#include <sys/shm.h>
	32	#include <sys/socket.h>
	33	#include <sys/stat.h>
	34	#include <sys/types.h>
	35	#include <urcu/list.h>
	36	#include <poll.h>
	37	#include <unistd.h>
	38	#include <sys/mman.h>
	39	#include <assert.h>
	40	#include <config.h>
	41	#include <urcu/compiler.h>
	42
	43	#include <lttng-consumerd.h>
	44	#include <lttng-kernel-ctl.h>
	45	#include <lttng-sessiond-comm.h>
	46	#include <lttng/lttng-kconsumer.h>
	47	#include <lttng/lttng-ustconsumer.h>
	48	#include <lttngerr.h>
	49
	50	/* TODO : support UST (all direct kernctl accesses). */
	51
	52	/* the two threads (receive fd and poll) */
	53	static pthread_t threads[2];
	54
	55	/* to count the number of time the user pressed ctrl+c */
	56	static int sigintcount = 0;
	57
	58	/* Argument variables */
	59	int opt_quiet;
	60	int opt_verbose;
	61	static int opt_daemon;
	62	static const char *progname;
	63	static char command_sock_path[PATH_MAX]; /* Global command socket path */
	64	static char error_sock_path[PATH_MAX]; /* Global error path */
	65	static enum lttng_consumer_type opt_type = LTTNG_CONSUMER_KERNEL;
	66
	67	/* the liblttngconsumerd context */
	68	static struct lttng_consumer_local_data *ctx;
	69
	70	/*
	71	* Signal handler for the daemon
	72	*/
	73	static void sighandler(int sig)
	74	{
	75	if (sig == SIGINT && sigintcount++ == 0) {
	76	DBG("ignoring first SIGINT");
	77	return;
	78	}
	79
	80	lttng_consumer_should_exit(ctx);
	81	}
	82
	83	/*
	84	* Setup signal handler for :
	85	* SIGINT, SIGTERM, SIGPIPE
	86	*/
	87	static int set_signal_handler(void)
	88	{
	89	int ret = 0;
	90	struct sigaction sa;
	91	sigset_t sigset;
	92
	93	if ((ret = sigemptyset(&sigset)) < 0) {
	94	perror("sigemptyset");
	95	return ret;
	96	}
	97
	98	sa.sa_handler = sighandler;
	99	sa.sa_mask = sigset;
	100	sa.sa_flags = 0;
	101	if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
	102	perror("sigaction");
	103	return ret;
	104	}
	105
	106	if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
	107	perror("sigaction");
	108	return ret;
	109	}
	110
	111	if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
	112	perror("sigaction");
	113	return ret;
	114	}
	115
	116	return ret;
	117	}
	118
	119	/*
	120	* usage function on stderr
	121	*/
	122	static void usage(void)
	123	{
	124	fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname);
	125	fprintf(stderr, " -h, --help "
	126	"Display this usage.\n");
	127	fprintf(stderr, " -c, --consumerd-cmd-sock PATH "
	128	"Specify path for the command socket\n");
	129	fprintf(stderr, " -e, --consumerd-err-sock PATH "
	130	"Specify path for the error socket\n");
	131	fprintf(stderr, " -d, --daemonize "
	132	"Start as a daemon.\n");
	133	fprintf(stderr, " -q, --quiet "
	134	"No output at all.\n");
	135	fprintf(stderr, " -v, --verbose "
	136	"Verbose mode. Activate DBG() macro.\n");
	137	fprintf(stderr, " -V, --version "
	138	"Show version number.\n");
	139	fprintf(stderr, " -k, --kernel "
	140	"Consumer kernel buffers (default).\n");
	141	fprintf(stderr, " -u, --ust "
	142	"Consumer UST buffers.%s\n",
	143	#ifdef HAVE_LIBLTTNG_UST_CTL
	144	""
	145	#else
	146	" (support not compiled in)"
	147	#endif
	148	);
	149	}
	150
	151	/*
	152	* daemon argument parsing
	153	*/
	154	static void parse_args(int argc, char **argv)
	155	{
	156	int c;
	157
	158	static struct option long_options[] = {
	159	{ "consumerd-cmd-sock", 1, 0, 'c' },
	160	{ "consumerd-err-sock", 1, 0, 'e' },
	161	{ "daemonize", 0, 0, 'd' },
	162	{ "help", 0, 0, 'h' },
	163	{ "quiet", 0, 0, 'q' },
	164	{ "verbose", 0, 0, 'v' },
	165	{ "version", 0, 0, 'V' },
	166	{ "kernel", 0, 0, 'k' },
	167	#ifdef HAVE_LIBLTTNG_UST_CTL
	168	{ "ust", 0, 0, 'u' },
	169	#endif
	170	{ NULL, 0, 0, 0 }
	171	};
	172
	173	while (1) {
	174	int option_index = 0;
	175	c = getopt_long(argc, argv, "dhqvVku" "c:e:", long_options, &option_index);
	176	if (c == -1) {
	177	break;
	178	}
	179
	180	switch (c) {
	181	case 0:
	182	fprintf(stderr, "option %s", long_options[option_index].name);
	183	if (optarg) {
	184	fprintf(stderr, " with arg %s\n", optarg);
	185	}
	186	break;
	187	case 'c':
	188	snprintf(command_sock_path, PATH_MAX, "%s", optarg);
	189	break;
	190	case 'e':
	191	snprintf(error_sock_path, PATH_MAX, "%s", optarg);
	192	break;
	193	case 'd':
	194	opt_daemon = 1;
	195	break;
	196	case 'h':
	197	usage();
	198	exit(EXIT_FAILURE);
	199	case 'q':
	200	opt_quiet = 1;
	201	break;
	202	case 'v':
	203	opt_verbose = 1;
	204	break;
	205	case 'V':
	206	fprintf(stdout, "%s\n", VERSION);
	207	exit(EXIT_SUCCESS);
	208	case 'k':
	209	opt_type = LTTNG_CONSUMER_KERNEL;
	210	break;
	211	#ifdef HAVE_LIBLTTNG_UST_CTL
	212	case 'u':
	213	# if (CAA_BITS_PER_LONG == 64)
	214	opt_type = LTTNG_CONSUMER64_UST;
	215	# elif (CAA_BITS_PER_LONG == 32)
	216	opt_type = LTTNG_CONSUMER32_UST;
	217	# else
	218	# error "Unknown bitness"
	219	# endif
	220	break;
	221	#endif
	222	default:
	223	usage();
	224	exit(EXIT_FAILURE);
	225	}
	226	}
	227	}
	228
	229	/*
	230	* main
	231	*/
	232	int main(int argc, char **argv)
	233	{
	234	int i;
	235	int ret = 0;
	236	void *status;
	237
	238	/* Parse arguments */
	239	progname = argv[0];
	240	parse_args(argc, argv);
	241
	242	/* Daemonize */
	243	if (opt_daemon) {
	244	ret = daemon(0, 0);
	245	if (ret < 0) {
	246	perror("daemon");
	247	goto error;
	248	}
	249	}
	250
	251	if (strlen(command_sock_path) == 0) {
	252	switch (opt_type) {
	253	case LTTNG_CONSUMER_KERNEL:
	254	snprintf(command_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH,
	255	LTTNG_RUNDIR);
	256	break;
	257	case LTTNG_CONSUMER64_UST:
	258	snprintf(command_sock_path, PATH_MAX,
	259	USTCONSUMERD64_CMD_SOCK_PATH, LTTNG_RUNDIR);
	260	break;
	261	case LTTNG_CONSUMER32_UST:
	262	snprintf(command_sock_path, PATH_MAX,
	263	USTCONSUMERD32_CMD_SOCK_PATH, LTTNG_RUNDIR);
	264	break;
	265	default:
	266	WARN("Unknown consumerd type");
	267	goto error;
	268	}
	269	}
	270
	271	/* Init */
	272	lttng_consumer_init();
	273
	274	/* create the consumer instance with and assign the callbacks */
	275	ctx = lttng_consumer_create(opt_type, lttng_consumer_read_subbuffer,
	276	NULL, lttng_consumer_on_recv_stream, NULL);
	277	if (ctx == NULL) {
	278	goto error;
	279	}
	280
	281	lttng_consumer_set_command_sock_path(ctx, command_sock_path);
	282	if (strlen(error_sock_path) == 0) {
	283	switch (opt_type) {
	284	case LTTNG_CONSUMER_KERNEL:
	285	snprintf(error_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH,
	286	LTTNG_RUNDIR);
	287	break;
	288	case LTTNG_CONSUMER64_UST:
	289	snprintf(error_sock_path, PATH_MAX,
	290	USTCONSUMERD64_ERR_SOCK_PATH, LTTNG_RUNDIR);
	291	break;
	292	case LTTNG_CONSUMER32_UST:
	293	snprintf(error_sock_path, PATH_MAX,
	294	USTCONSUMERD32_ERR_SOCK_PATH, LTTNG_RUNDIR);
	295	break;
	296	default:
	297	WARN("Unknown consumerd type");
	298	goto error;
	299	}
	300	}
	301
	302	if (set_signal_handler() < 0) {
	303	goto error;
	304	}
	305
	306	/* Connect to the socket created by lttng-sessiond to report errors */
	307	DBG("Connecting to error socket %s", error_sock_path);
	308	ret = lttcomm_connect_unix_sock(error_sock_path);
	309	/* not a fatal error, but all communication with lttng-sessiond will fail */
	310	if (ret < 0) {
	311	WARN("Cannot connect to error socket, is lttng-sessiond started ?");
	312	}
	313	lttng_consumer_set_error_sock(ctx, ret);
	314
	315	/* Create the thread to manage the receive of fd */
	316	ret = pthread_create(&threads[0], NULL, lttng_consumer_thread_receive_fds,
	317	(void *) ctx);
	318	if (ret != 0) {
	319	perror("pthread_create");
	320	goto error;
	321	}
	322
	323	/* Create thread to manage the polling/writing of traces */
	324	ret = pthread_create(&threads[1], NULL, lttng_consumer_thread_poll_fds,
	325	(void *) ctx);
	326	if (ret != 0) {
	327	perror("pthread_create");
	328	goto error;
	329	}
	330
	331	for (i = 0; i < 2; i++) {
	332	ret = pthread_join(threads[i], &status);
	333	if (ret != 0) {
	334	perror("pthread_join");
	335	goto error;
	336	}
	337	}
	338	ret = EXIT_SUCCESS;
	339	lttng_consumer_send_error(ctx, CONSUMERD_EXIT_SUCCESS);
	340	goto end;
	341
	342	error:
	343	ret = EXIT_FAILURE;
	344	lttng_consumer_send_error(ctx, CONSUMERD_EXIT_FAILURE);
	345
	346	end:
	347	lttng_consumer_destroy(ctx);
	348	lttng_consumer_cleanup();
	349
	350	return ret;
	351	}