[lttng-tools.git] / lttng-sessiond / ust-consumer.c

/*
 * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
 *
 * This program is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License as published by the Free
 * Software Foundation; only version 2 of the License.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
 * Place - Suite 330, Boston, MA  02111-1307, USA.
 */

#define _GNU_SOURCE
#include <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <lttngerr.h>
#include <lttng-share.h>
#include <lttng-sessiond-comm.h>
#include <lttng/lttng-consumer.h>

#include "hashtable.h"
#include "ust-consumer.h"

/*
 * Send all stream fds of UST channel to the consumer.
 */
static int send_channel_streams(int sock,
		struct ust_app_channel *uchan)
{
	int ret, fd;
	struct lttcomm_consumer_msg lum;
	struct ltt_ust_stream *stream;

	DBG("Sending streams of channel %s to UST consumer", uchan->name);

	/* Send channel */
	lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;

	/*
	 * We need to keep shm_fd open to make sure this key stays unique within
	 * the session daemon.
	 */
	lum.u.channel.channel_key = uchan->obj->shm_fd;
	lum.u.channel.max_sb_size = uchan->attr.subbuf_size;
	lum.u.channel.mmap_len = uchan->obj->memory_map_size;
	DBG("Sending channel %d to consumer", lum.u.channel.channel_key);
	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
	if (ret < 0) {
		perror("send consumer channel");
		goto error;
	}
	fd = uchan->obj->shm_fd;
	ret = lttcomm_send_fds_unix_sock(sock, &fd, 1);
	if (ret < 0) {
		perror("send consumer channel ancillary data");
		goto error;
	}

	cds_list_for_each_entry(stream, &uchan->streams.head, list) {
		int fds[2];

		if (!stream->obj->shm_fd) {
			continue;
		}
		lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
		lum.u.stream.channel_key = uchan->obj->shm_fd;
		lum.u.stream.stream_key = stream->obj->shm_fd;
		lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
		/*
		 * FIXME Hack alert! we force MMAP for now. Mixup
		 * between EVENT and UST enums elsewhere.
		 */
		lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT;
		lum.u.stream.mmap_len = stream->obj->memory_map_size;
		strncpy(lum.u.stream.path_name, stream->pathname, PATH_MAX - 1);
		lum.u.stream.path_name[PATH_MAX - 1] = '\0';
		DBG("Sending stream %d to consumer", lum.u.stream.stream_key);
		ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
		if (ret < 0) {
			perror("send consumer stream");
			goto error;
		}

		fds[0] = stream->obj->shm_fd;
		fds[1] = stream->obj->wait_fd;
		ret = lttcomm_send_fds_unix_sock(sock, fds, 2);
		if (ret < 0) {
			perror("send consumer stream ancillary data");
			goto error;
		}
	}

	DBG("consumer channel streams sent");

	return 0;

error:
	return ret;
}

/*
 * Send all stream fds of the UST session to the consumer.
 */
int ust_consumer_send_session(int consumer_fd, struct ust_app_session *usess)
{
	int ret = 0;
	int sock = consumer_fd;
	struct cds_lfht_iter iter;
	struct cds_lfht_node *node;
	struct lttcomm_consumer_msg lum;
	struct ust_app_channel *uchan;

	DBG("Sending metadata stream fd");

	if (usess->metadata->obj->shm_fd != 0) {
		int fd;
		int fds[2];

		/* Send metadata channel fd */
		lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
		lum.u.channel.channel_key = usess->metadata->obj->shm_fd;
		lum.u.channel.max_sb_size = usess->metadata->attr.subbuf_size;
		lum.u.channel.mmap_len = usess->metadata->obj->memory_map_size;
		DBG("Sending metadata channel %d to consumer", lum.u.channel.channel_key);
		ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
		if (ret < 0) {
			perror("send consumer channel");
			goto error;
		}
		fd = usess->metadata->obj->shm_fd;
		ret = lttcomm_send_fds_unix_sock(sock, &fd, 1);
		if (ret < 0) {
			perror("send consumer metadata channel");
			goto error;
		}

		/* Send metadata stream fd */
		lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
		lum.u.stream.channel_key = usess->metadata->obj->shm_fd;
		lum.u.stream.stream_key = usess->metadata->stream_obj->shm_fd;
		lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
		lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT;
		lum.u.stream.mmap_len = usess->metadata->stream_obj->memory_map_size;
		strncpy(lum.u.stream.path_name, usess->metadata->pathname, PATH_MAX - 1);
		lum.u.stream.path_name[PATH_MAX - 1] = '\0';
		DBG("Sending metadata stream %d to consumer", lum.u.stream.stream_key);
		ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
		if (ret < 0) {
			perror("send consumer metadata stream");
			goto error;
		}
		fds[0] = usess->metadata->stream_obj->shm_fd;
		fds[1] = usess->metadata->stream_obj->wait_fd;
		ret = lttcomm_send_fds_unix_sock(sock, fds, 2);
		if (ret < 0) {
			perror("send consumer stream");
			goto error;
		}
	}

	/* Send each channel fd streams of session */
	rcu_read_lock();
	hashtable_get_first(usess->channels, &iter);
	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
		uchan = caa_container_of(node, struct ust_app_channel, node);

		ret = send_channel_streams(sock, uchan);
		if (ret < 0) {
			rcu_read_unlock();
			goto error;
		}
		hashtable_get_next(usess->channels, &iter);
	}
	rcu_read_unlock();

	DBG("consumer fds (metadata and channel streams) sent");

	return 0;

error:
	return ret;
}
Commit	Line	Data
48842b30 DG	1	/*
	2	* Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
	3	*
	4	* This program is free software; you can redistribute it and/or modify it
	5	* under the terms of the GNU General Public License as published by the Free
	6	* Software Foundation; only version 2 of the License.
	7	*
	8	* This program is distributed in the hope that it will be useful, but WITHOUT
	9	* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
	10	* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
	11	* more details.
	12	*
	13	* You should have received a copy of the GNU General Public License along with
	14	* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
	15	* Place - Suite 330, Boston, MA 02111-1307, USA.
	16	*/
	17
	18	#define _GNU_SOURCE
	19	#include <errno.h>
	20	#include <stdio.h>
	21	#include <stdlib.h>
	22	#include <string.h>
	23	#include <unistd.h>
	24
	25	#include <lttngerr.h>
	26	#include <lttng-share.h>
	27	#include <lttng-sessiond-comm.h>
	28	#include <lttng/lttng-consumer.h>
	29
	30	#include "hashtable.h"
	31	#include "ust-consumer.h"
	32
	33	/*
	34	* Send all stream fds of UST channel to the consumer.
	35	*/
	36	static int send_channel_streams(int sock,
	37	struct ust_app_channel *uchan)
	38	{
8010679a	39	int ret, fd;
48842b30	40	struct lttcomm_consumer_msg lum;
5af2f756	41	struct ltt_ust_stream *stream;
48842b30 DG	42
	43	DBG("Sending streams of channel %s to UST consumer", uchan->name);
	44
	45	/* Send channel */
	46	lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
	47
	48	/*
	49	* We need to keep shm_fd open to make sure this key stays unique within
	50	* the session daemon.
	51	*/
	52	lum.u.channel.channel_key = uchan->obj->shm_fd;
	53	lum.u.channel.max_sb_size = uchan->attr.subbuf_size;
	54	lum.u.channel.mmap_len = uchan->obj->memory_map_size;
	55	DBG("Sending channel %d to consumer", lum.u.channel.channel_key);
	56	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
	57	if (ret < 0) {
	58	perror("send consumer channel");
	59	goto error;
	60	}
8010679a MD	61	fd = uchan->obj->shm_fd;
8010679a MD	62	ret = lttcomm_send_fds_unix_sock(sock, &fd, 1);
48842b30 DG	63	if (ret < 0) {
	64	perror("send consumer channel ancillary data");
	65	goto error;
	66	}
	67
5af2f756	68	cds_list_for_each_entry(stream, &uchan->streams.head, list) {
48842b30 DG	69	int fds[2];
	70
	71	if (!stream->obj->shm_fd) {
5af2f756	72	continue;
48842b30	73	}
48842b30 DG	74	lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
	75	lum.u.stream.channel_key = uchan->obj->shm_fd;
	76	lum.u.stream.stream_key = stream->obj->shm_fd;
	77	lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
d41f73b7 MD	78	/*
	79	* FIXME Hack alert! we force MMAP for now. Mixup
	80	* between EVENT and UST enums elsewhere.
	81	*/
	82	lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT;
48842b30 DG	83	lum.u.stream.mmap_len = stream->obj->memory_map_size;
	84	strncpy(lum.u.stream.path_name, stream->pathname, PATH_MAX - 1);
	85	lum.u.stream.path_name[PATH_MAX - 1] = '\0';
	86	DBG("Sending stream %d to consumer", lum.u.stream.stream_key);
	87	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
	88	if (ret < 0) {
	89	perror("send consumer stream");
	90	goto error;
	91	}
	92
	93	fds[0] = stream->obj->shm_fd;
	94	fds[1] = stream->obj->wait_fd;
	95	ret = lttcomm_send_fds_unix_sock(sock, fds, 2);
	96	if (ret < 0) {
	97	perror("send consumer stream ancillary data");
	98	goto error;
	99	}
48842b30	100	}
48842b30 DG	101
	102	DBG("consumer channel streams sent");
	103
	104	return 0;
	105
	106	error:
	107	return ret;
	108	}
	109
	110	/*
	111	* Send all stream fds of the UST session to the consumer.
	112	*/
	113	int ust_consumer_send_session(int consumer_fd, struct ust_app_session *usess)
	114	{
	115	int ret = 0;
	116	int sock = consumer_fd;
	117	struct cds_lfht_iter iter;
	118	struct cds_lfht_node *node;
	119	struct lttcomm_consumer_msg lum;
	120	struct ust_app_channel *uchan;
	121
	122	DBG("Sending metadata stream fd");
	123
	124	if (usess->metadata->obj->shm_fd != 0) {
8010679a	125	int fd;
48842b30 DG	126	int fds[2];
	127
	128	/* Send metadata channel fd */
	129	lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
	130	lum.u.channel.channel_key = usess->metadata->obj->shm_fd;
	131	lum.u.channel.max_sb_size = usess->metadata->attr.subbuf_size;
3ee75e9c	132	lum.u.channel.mmap_len = usess->metadata->obj->memory_map_size;
ee6b7fb2	133	DBG("Sending metadata channel %d to consumer", lum.u.channel.channel_key);
48842b30 DG	134	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
	135	if (ret < 0) {
	136	perror("send consumer channel");
	137	goto error;
	138	}
8010679a MD	139	fd = usess->metadata->obj->shm_fd;
8010679a MD	140	ret = lttcomm_send_fds_unix_sock(sock, &fd, 1);
48842b30 DG	141	if (ret < 0) {
	142	perror("send consumer metadata channel");
	143	goto error;
	144	}
	145
	146	/* Send metadata stream fd */
	147	lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
	148	lum.u.stream.channel_key = usess->metadata->obj->shm_fd;
	149	lum.u.stream.stream_key = usess->metadata->stream_obj->shm_fd;
	150	lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
	151	lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT;
	152	lum.u.stream.mmap_len = usess->metadata->stream_obj->memory_map_size;
	153	strncpy(lum.u.stream.path_name, usess->metadata->pathname, PATH_MAX - 1);
	154	lum.u.stream.path_name[PATH_MAX - 1] = '\0';
	155	DBG("Sending metadata stream %d to consumer", lum.u.stream.stream_key);
	156	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
	157	if (ret < 0) {
	158	perror("send consumer metadata stream");
	159	goto error;
	160	}
	161	fds[0] = usess->metadata->stream_obj->shm_fd;
	162	fds[1] = usess->metadata->stream_obj->wait_fd;
	163	ret = lttcomm_send_fds_unix_sock(sock, fds, 2);
	164	if (ret < 0) {
	165	perror("send consumer stream");
	166	goto error;
	167	}
	168	}
	169
	170	/* Send each channel fd streams of session */
	171	rcu_read_lock();
	172	hashtable_get_first(usess->channels, &iter);
	173	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
	174	uchan = caa_container_of(node, struct ust_app_channel, node);
	175
	176	ret = send_channel_streams(sock, uchan);
	177	if (ret < 0) {
5485f822	178	rcu_read_unlock();
48842b30 DG	179	goto error;
	180	}
	181	hashtable_get_next(usess->channels, &iter);
	182	}
	183	rcu_read_unlock();
	184
	185	DBG("consumer fds (metadata and channel streams) sent");
	186
	187	return 0;
	188
	189	error:
	190	return ret;
	191	}