[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, *tmp;

	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 while we transfer the stream file
	 * descriptors to make sure this key stays unique within the
	 * session daemon. We can free the channel shm_fd without
	 * problem after we finished sending stream fds for that
	 * channel.
	 */
	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_safe(stream, tmp, &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;
d80a6244	41	struct ltt_ust_stream stream, tmp;
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	/*
7ad0a0cb MD	49	* We need to keep shm_fd open while we transfer the stream file
	50	* descriptors to make sure this key stays unique within the
	51	* session daemon. We can free the channel shm_fd without
	52	* problem after we finished sending stream fds for that
	53	* channel.
48842b30 DG	54	*/
	55	lum.u.channel.channel_key = uchan->obj->shm_fd;
	56	lum.u.channel.max_sb_size = uchan->attr.subbuf_size;
	57	lum.u.channel.mmap_len = uchan->obj->memory_map_size;
	58	DBG("Sending channel %d to consumer", lum.u.channel.channel_key);
	59	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
	60	if (ret < 0) {
	61	perror("send consumer channel");
	62	goto error;
	63	}
8010679a MD	64	fd = uchan->obj->shm_fd;
8010679a MD	65	ret = lttcomm_send_fds_unix_sock(sock, &fd, 1);
48842b30 DG	66	if (ret < 0) {
	67	perror("send consumer channel ancillary data");
	68	goto error;
	69	}
	70
d80a6244	71	cds_list_for_each_entry_safe(stream, tmp, &uchan->streams.head, list) {
48842b30 DG	72	int fds[2];
	73
	74	if (!stream->obj->shm_fd) {
5af2f756	75	continue;
48842b30	76	}
48842b30 DG	77	lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
	78	lum.u.stream.channel_key = uchan->obj->shm_fd;
	79	lum.u.stream.stream_key = stream->obj->shm_fd;
	80	lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
d41f73b7 MD	81	/*
	82	* FIXME Hack alert! we force MMAP for now. Mixup
	83	* between EVENT and UST enums elsewhere.
	84	*/
	85	lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT;
48842b30 DG	86	lum.u.stream.mmap_len = stream->obj->memory_map_size;
	87	strncpy(lum.u.stream.path_name, stream->pathname, PATH_MAX - 1);
	88	lum.u.stream.path_name[PATH_MAX - 1] = '\0';
	89	DBG("Sending stream %d to consumer", lum.u.stream.stream_key);
	90	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
	91	if (ret < 0) {
	92	perror("send consumer stream");
	93	goto error;
	94	}
	95
	96	fds[0] = stream->obj->shm_fd;
	97	fds[1] = stream->obj->wait_fd;
	98	ret = lttcomm_send_fds_unix_sock(sock, fds, 2);
	99	if (ret < 0) {
	100	perror("send consumer stream ancillary data");
	101	goto error;
	102	}
48842b30	103	}
48842b30 DG	104
	105	DBG("consumer channel streams sent");
	106
	107	return 0;
	108
	109	error:
	110	return ret;
	111	}
	112
	113	/*
	114	* Send all stream fds of the UST session to the consumer.
	115	*/
	116	int ust_consumer_send_session(int consumer_fd, struct ust_app_session *usess)
	117	{
	118	int ret = 0;
	119	int sock = consumer_fd;
	120	struct cds_lfht_iter iter;
	121	struct cds_lfht_node *node;
	122	struct lttcomm_consumer_msg lum;
	123	struct ust_app_channel *uchan;
	124
	125	DBG("Sending metadata stream fd");
	126
	127	if (usess->metadata->obj->shm_fd != 0) {
8010679a	128	int fd;
48842b30 DG	129	int fds[2];
	130
	131	/* Send metadata channel fd */
	132	lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
	133	lum.u.channel.channel_key = usess->metadata->obj->shm_fd;
	134	lum.u.channel.max_sb_size = usess->metadata->attr.subbuf_size;
3ee75e9c	135	lum.u.channel.mmap_len = usess->metadata->obj->memory_map_size;
ee6b7fb2	136	DBG("Sending metadata channel %d to consumer", lum.u.channel.channel_key);
48842b30 DG	137	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
	138	if (ret < 0) {
	139	perror("send consumer channel");
	140	goto error;
	141	}
8010679a MD	142	fd = usess->metadata->obj->shm_fd;
8010679a MD	143	ret = lttcomm_send_fds_unix_sock(sock, &fd, 1);
48842b30 DG	144	if (ret < 0) {
	145	perror("send consumer metadata channel");
	146	goto error;
	147	}
	148
	149	/* Send metadata stream fd */
	150	lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
	151	lum.u.stream.channel_key = usess->metadata->obj->shm_fd;
	152	lum.u.stream.stream_key = usess->metadata->stream_obj->shm_fd;
	153	lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
	154	lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT;
	155	lum.u.stream.mmap_len = usess->metadata->stream_obj->memory_map_size;
	156	strncpy(lum.u.stream.path_name, usess->metadata->pathname, PATH_MAX - 1);
	157	lum.u.stream.path_name[PATH_MAX - 1] = '\0';
	158	DBG("Sending metadata stream %d to consumer", lum.u.stream.stream_key);
	159	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
	160	if (ret < 0) {
	161	perror("send consumer metadata stream");
	162	goto error;
	163	}
	164	fds[0] = usess->metadata->stream_obj->shm_fd;
	165	fds[1] = usess->metadata->stream_obj->wait_fd;
	166	ret = lttcomm_send_fds_unix_sock(sock, fds, 2);
	167	if (ret < 0) {
	168	perror("send consumer stream");
	169	goto error;
	170	}
	171	}
	172
	173	/* Send each channel fd streams of session */
	174	rcu_read_lock();
	175	hashtable_get_first(usess->channels, &iter);
	176	while ((node = hashtable_iter_get_node(&iter)) != NULL) {
	177	uchan = caa_container_of(node, struct ust_app_channel, node);
	178
	179	ret = send_channel_streams(sock, uchan);
	180	if (ret < 0) {
5485f822	181	rcu_read_unlock();
48842b30 DG	182	goto error;
	183	}
	184	hashtable_get_next(usess->channels, &iter);
	185	}
	186	rcu_read_unlock();
	187
	188	DBG("consumer fds (metadata and channel streams) sent");
	189
	190	return 0;
	191
	192	error:
	193	return ret;
	194	}