[lttng-tools.git] / src / bin / 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, 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 <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 <common/defaults.h>
#include <common/common.h>
#include <common/kernel-consumer/kernel-consumer.h>
#include <common/kernel-ctl/kernel-ctl.h>
#include <common/sessiond-comm/sessiond-comm.h>
#include <common/ust-consumer/ust-consumer.h>

#include "lttng-consumerd.h"

/* TODO : support UST (all direct kernel-ctl accesses). */

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

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

/* Argument variables */
int lttng_opt_quiet;    /* not static in error.h */
int lttng_opt_verbose;  /* not static in error.h */
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 stream file.
 */
static void usage(FILE *fp)
{
	fprintf(fp, "Usage: %s OPTIONS\n\nOptions:\n", progname);
	fprintf(fp, "  -h, --help                         "
			"Display this usage.\n");
	fprintf(fp, "  -c, --consumerd-cmd-sock PATH     "
			"Specify path for the command socket\n");
	fprintf(fp, "  -e, --consumerd-err-sock PATH     "
			"Specify path for the error socket\n");
	fprintf(fp, "  -d, --daemonize                    "
			"Start as a daemon.\n");
	fprintf(fp, "  -q, --quiet                        "
			"No output at all.\n");
	fprintf(fp, "  -v, --verbose                      "
			"Verbose mode. Activate DBG() macro.\n");
	fprintf(fp, "  -V, --version                      "
			"Show version number.\n");
	fprintf(fp, "  -k, --kernel                       "
			"Consumer kernel buffers (default).\n");
	fprintf(fp, "  -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(stdout);
			exit(EXIT_SUCCESS);
		case 'q':
			lttng_opt_quiet = 1;
			break;
		case 'v':
			lttng_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(stderr);
			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, DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
					DEFAULT_LTTNG_RUNDIR);
			break;
		case LTTNG_CONSUMER64_UST:
			snprintf(command_sock_path, PATH_MAX,
					DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
			break;
		case LTTNG_CONSUMER32_UST:
			snprintf(command_sock_path, PATH_MAX,
					DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, DEFAULT_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, DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
					DEFAULT_LTTNG_RUNDIR);
			break;
		case LTTNG_CONSUMER64_UST:
			snprintf(error_sock_path, PATH_MAX,
					DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
			break;
		case LTTNG_CONSUMER32_UST:
			snprintf(error_sock_path, PATH_MAX,
					DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, DEFAULT_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 modify
	6	* it under the terms of the GNU General Public License, version 2 only,
	7	* as published by the Free Software Foundation.
	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 along
	15	* with this program; if not, write to the Free Software Foundation, Inc.,
	16	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
	17	*/
	18
	19	#define _GNU_SOURCE
	20	#include <fcntl.h>
	21	#include <getopt.h>
	22	#include <grp.h>
	23	#include <limits.h>
	24	#include <pthread.h>
	25	#include <signal.h>
	26	#include <stdio.h>
	27	#include <stdlib.h>
	28	#include <string.h>
	29	#include <sys/ipc.h>
	30	#include <sys/shm.h>
	31	#include <sys/socket.h>
	32	#include <sys/stat.h>
	33	#include <sys/types.h>
	34	#include <urcu/list.h>
	35	#include <poll.h>
	36	#include <unistd.h>
	37	#include <sys/mman.h>
	38	#include <assert.h>
	39	#include <config.h>
	40	#include <urcu/compiler.h>
	41
	42	#include <common/defaults.h>
	43	#include <common/common.h>
	44	#include <common/kernel-consumer/kernel-consumer.h>
	45	#include <common/kernel-ctl/kernel-ctl.h>
	46	#include <common/sessiond-comm/sessiond-comm.h>
	47	#include <common/ust-consumer/ust-consumer.h>
	48
	49	#include "lttng-consumerd.h"
	50
	51	/* TODO : support UST (all direct kernel-ctl accesses). */
	52
	53	/* the two threads (receive fd and poll) */
	54	static pthread_t threads[2];
	55
	56	/* to count the number of times the user pressed ctrl+c */
	57	static int sigintcount = 0;
	58
	59	/* Argument variables */
	60	int lttng_opt_quiet; /* not static in error.h */
	61	int lttng_opt_verbose; /* not static in error.h */
	62	static int opt_daemon;
	63	static const char *progname;
	64	static char command_sock_path[PATH_MAX]; /* Global command socket path */
	65	static char error_sock_path[PATH_MAX]; /* Global error path */
	66	static enum lttng_consumer_type opt_type = LTTNG_CONSUMER_KERNEL;
	67
	68	/* the liblttngconsumerd context */
	69	static struct lttng_consumer_local_data *ctx;
	70
	71	/*
	72	* Signal handler for the daemon
	73	*/
	74	static void sighandler(int sig)
	75	{
	76	if (sig == SIGINT && sigintcount++ == 0) {
	77	DBG("ignoring first SIGINT");
	78	return;
	79	}
	80
	81	lttng_consumer_should_exit(ctx);
	82	}
	83
	84	/*
	85	* Setup signal handler for :
	86	* SIGINT, SIGTERM, SIGPIPE
	87	*/
	88	static int set_signal_handler(void)
	89	{
	90	int ret = 0;
	91	struct sigaction sa;
	92	sigset_t sigset;
	93
	94	if ((ret = sigemptyset(&sigset)) < 0) {
	95	perror("sigemptyset");
	96	return ret;
	97	}
	98
	99	sa.sa_handler = sighandler;
	100	sa.sa_mask = sigset;
	101	sa.sa_flags = 0;
	102	if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) {
	103	perror("sigaction");
	104	return ret;
	105	}
	106
	107	if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) {
	108	perror("sigaction");
	109	return ret;
	110	}
	111
	112	if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) {
	113	perror("sigaction");
	114	return ret;
	115	}
	116
	117	return ret;
	118	}
	119
	120	/*
	121	* Usage function on stream file.
	122	*/
	123	static void usage(FILE *fp)
	124	{
	125	fprintf(fp, "Usage: %s OPTIONS\n\nOptions:\n", progname);
	126	fprintf(fp, " -h, --help "
	127	"Display this usage.\n");
	128	fprintf(fp, " -c, --consumerd-cmd-sock PATH "
	129	"Specify path for the command socket\n");
	130	fprintf(fp, " -e, --consumerd-err-sock PATH "
	131	"Specify path for the error socket\n");
	132	fprintf(fp, " -d, --daemonize "
	133	"Start as a daemon.\n");
	134	fprintf(fp, " -q, --quiet "
	135	"No output at all.\n");
	136	fprintf(fp, " -v, --verbose "
	137	"Verbose mode. Activate DBG() macro.\n");
	138	fprintf(fp, " -V, --version "
	139	"Show version number.\n");
	140	fprintf(fp, " -k, --kernel "
	141	"Consumer kernel buffers (default).\n");
	142	fprintf(fp, " -u, --ust "
	143	"Consumer UST buffers.%s\n",
	144	#ifdef HAVE_LIBLTTNG_UST_CTL
	145	""
	146	#else
	147	" (support not compiled in)"
	148	#endif
	149	);
	150	}
	151
	152	/*
	153	* daemon argument parsing
	154	*/
	155	static void parse_args(int argc, char **argv)
	156	{
	157	int c;
	158
	159	static struct option long_options[] = {
	160	{ "consumerd-cmd-sock", 1, 0, 'c' },
	161	{ "consumerd-err-sock", 1, 0, 'e' },
	162	{ "daemonize", 0, 0, 'd' },
	163	{ "help", 0, 0, 'h' },
	164	{ "quiet", 0, 0, 'q' },
	165	{ "verbose", 0, 0, 'v' },
	166	{ "version", 0, 0, 'V' },
	167	{ "kernel", 0, 0, 'k' },
	168	#ifdef HAVE_LIBLTTNG_UST_CTL
	169	{ "ust", 0, 0, 'u' },
	170	#endif
	171	{ NULL, 0, 0, 0 }
	172	};
	173
	174	while (1) {
	175	int option_index = 0;
	176	c = getopt_long(argc, argv, "dhqvVku" "c:e:", long_options, &option_index);
	177	if (c == -1) {
	178	break;
	179	}
	180
	181	switch (c) {
	182	case 0:
	183	fprintf(stderr, "option %s", long_options[option_index].name);
	184	if (optarg) {
	185	fprintf(stderr, " with arg %s\n", optarg);
	186	}
	187	break;
	188	case 'c':
	189	snprintf(command_sock_path, PATH_MAX, "%s", optarg);
	190	break;
	191	case 'e':
	192	snprintf(error_sock_path, PATH_MAX, "%s", optarg);
	193	break;
	194	case 'd':
	195	opt_daemon = 1;
	196	break;
	197	case 'h':
	198	usage(stdout);
	199	exit(EXIT_SUCCESS);
	200	case 'q':
	201	lttng_opt_quiet = 1;
	202	break;
	203	case 'v':
	204	lttng_opt_verbose = 1;
	205	break;
	206	case 'V':
	207	fprintf(stdout, "%s\n", VERSION);
	208	exit(EXIT_SUCCESS);
	209	case 'k':
	210	opt_type = LTTNG_CONSUMER_KERNEL;
	211	break;
	212	#ifdef HAVE_LIBLTTNG_UST_CTL
	213	case 'u':
	214	# if (CAA_BITS_PER_LONG == 64)
	215	opt_type = LTTNG_CONSUMER64_UST;
	216	# elif (CAA_BITS_PER_LONG == 32)
	217	opt_type = LTTNG_CONSUMER32_UST;
	218	# else
	219	# error "Unknown bitness"
	220	# endif
	221	break;
	222	#endif
	223	default:
	224	usage(stderr);
	225	exit(EXIT_FAILURE);
	226	}
	227	}
	228	}
	229
	230	/*
	231	* main
	232	*/
	233	int main(int argc, char **argv)
	234	{
	235	int i;
	236	int ret = 0;
	237	void *status;
	238
	239	/* Parse arguments */
	240	progname = argv[0];
	241	parse_args(argc, argv);
	242
	243	/* Daemonize */
	244	if (opt_daemon) {
	245	ret = daemon(0, 0);
	246	if (ret < 0) {
	247	perror("daemon");
	248	goto error;
	249	}
	250	}
	251
	252	if (strlen(command_sock_path) == 0) {
	253	switch (opt_type) {
	254	case LTTNG_CONSUMER_KERNEL:
	255	snprintf(command_sock_path, PATH_MAX, DEFAULT_KCONSUMERD_CMD_SOCK_PATH,
	256	DEFAULT_LTTNG_RUNDIR);
	257	break;
	258	case LTTNG_CONSUMER64_UST:
	259	snprintf(command_sock_path, PATH_MAX,
	260	DEFAULT_USTCONSUMERD64_CMD_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
	261	break;
	262	case LTTNG_CONSUMER32_UST:
	263	snprintf(command_sock_path, PATH_MAX,
	264	DEFAULT_USTCONSUMERD32_CMD_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
	265	break;
	266	default:
	267	WARN("Unknown consumerd type");
	268	goto error;
	269	}
	270	}
	271
	272	/* Init */
	273	lttng_consumer_init();
	274
	275	/* create the consumer instance with and assign the callbacks */
	276	ctx = lttng_consumer_create(opt_type, lttng_consumer_read_subbuffer,
	277	NULL, lttng_consumer_on_recv_stream, NULL);
	278	if (ctx == NULL) {
	279	goto error;
	280	}
	281
	282	lttng_consumer_set_command_sock_path(ctx, command_sock_path);
	283	if (strlen(error_sock_path) == 0) {
	284	switch (opt_type) {
	285	case LTTNG_CONSUMER_KERNEL:
	286	snprintf(error_sock_path, PATH_MAX, DEFAULT_KCONSUMERD_ERR_SOCK_PATH,
	287	DEFAULT_LTTNG_RUNDIR);
	288	break;
	289	case LTTNG_CONSUMER64_UST:
	290	snprintf(error_sock_path, PATH_MAX,
	291	DEFAULT_USTCONSUMERD64_ERR_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
	292	break;
	293	case LTTNG_CONSUMER32_UST:
	294	snprintf(error_sock_path, PATH_MAX,
	295	DEFAULT_USTCONSUMERD32_ERR_SOCK_PATH, DEFAULT_LTTNG_RUNDIR);
	296	break;
	297	default:
	298	WARN("Unknown consumerd type");
	299	goto error;
	300	}
	301	}
	302
	303	if (set_signal_handler() < 0) {
	304	goto error;
	305	}
	306
	307	/* Connect to the socket created by lttng-sessiond to report errors */
	308	DBG("Connecting to error socket %s", error_sock_path);
	309	ret = lttcomm_connect_unix_sock(error_sock_path);
	310	/* not a fatal error, but all communication with lttng-sessiond will fail */
	311	if (ret < 0) {
	312	WARN("Cannot connect to error socket (is lttng-sessiond started?)");
	313	}
	314	lttng_consumer_set_error_sock(ctx, ret);
	315
	316	/* Create the thread to manage the receive of fd */
	317	ret = pthread_create(&threads[0], NULL, lttng_consumer_thread_receive_fds,
	318	(void *) ctx);
	319	if (ret != 0) {
	320	perror("pthread_create");
	321	goto error;
	322	}
	323
	324	/* Create thread to manage the polling/writing of traces */
	325	ret = pthread_create(&threads[1], NULL, lttng_consumer_thread_poll_fds,
	326	(void *) ctx);
	327	if (ret != 0) {
	328	perror("pthread_create");
	329	goto error;
	330	}
	331
	332	for (i = 0; i < 2; i++) {
	333	ret = pthread_join(threads[i], &status);
	334	if (ret != 0) {
	335	perror("pthread_join");
	336	goto error;
	337	}
	338	}
	339	ret = EXIT_SUCCESS;
	340	lttng_consumer_send_error(ctx, CONSUMERD_EXIT_SUCCESS);
	341	goto end;
	342
	343	error:
	344	ret = EXIT_FAILURE;
	345	lttng_consumer_send_error(ctx, CONSUMERD_EXIT_FAILURE);
	346
	347	end:
	348	lttng_consumer_destroy(ctx);
	349	lttng_consumer_cleanup();
	350
	351	return ret;
	352	}