[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-ht.h>
#include <lttng-share.h>
#include <lttng-sessiond-comm.h>
#include <lttng/lttng-consumer.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,
		uid_t uid, gid_t gid)
{
	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;
		lum.u.stream.uid = uid;
		lum.u.stream.gid = gid;
		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 lttng_ht_iter iter;
	struct lttcomm_consumer_msg lum;
	struct ust_app_channel *ua_chan;

	DBG("Sending metadata stream fd");

	if (consumer_fd < 0) {
		ERR("Consumer has negative file descriptor");
		return -EINVAL;
	}

	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;
		lum.u.stream.uid = usess->uid;
		lum.u.stream.gid = usess->gid;
		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();
	cds_lfht_for_each_entry(usess->channels->ht, &iter.iter, ua_chan,
			node.node) {
		ret = send_channel_streams(sock, ua_chan, usess->uid, usess->gid);
		if (ret < 0) {
			rcu_read_unlock();
			goto error;
		}
	}
	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>
bec39940	26	#include <lttng-ht.h>
48842b30 DG	27	#include <lttng-share.h>
	28	#include <lttng-sessiond-comm.h>
	29	#include <lttng/lttng-consumer.h>
	30
48842b30 DG	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,
6df2e2c9 MD	37	struct ust_app_channel *uchan,
6df2e2c9 MD	38	uid_t uid, gid_t gid)
48842b30	39	{
8010679a	40	int ret, fd;
48842b30	41	struct lttcomm_consumer_msg lum;
d80a6244	42	struct ltt_ust_stream stream, tmp;
48842b30 DG	43
	44	DBG("Sending streams of channel %s to UST consumer", uchan->name);
	45
	46	/* Send channel */
	47	lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
	48
	49	/*
7ad0a0cb MD	50	* We need to keep shm_fd open while we transfer the stream file
	51	* descriptors to make sure this key stays unique within the
	52	* session daemon. We can free the channel shm_fd without
	53	* problem after we finished sending stream fds for that
	54	* channel.
48842b30 DG	55	*/
	56	lum.u.channel.channel_key = uchan->obj->shm_fd;
	57	lum.u.channel.max_sb_size = uchan->attr.subbuf_size;
	58	lum.u.channel.mmap_len = uchan->obj->memory_map_size;
	59	DBG("Sending channel %d to consumer", lum.u.channel.channel_key);
	60	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
	61	if (ret < 0) {
	62	perror("send consumer channel");
	63	goto error;
	64	}
8010679a MD	65	fd = uchan->obj->shm_fd;
8010679a MD	66	ret = lttcomm_send_fds_unix_sock(sock, &fd, 1);
48842b30 DG	67	if (ret < 0) {
	68	perror("send consumer channel ancillary data");
	69	goto error;
	70	}
	71
d80a6244	72	cds_list_for_each_entry_safe(stream, tmp, &uchan->streams.head, list) {
48842b30 DG	73	int fds[2];
	74
	75	if (!stream->obj->shm_fd) {
5af2f756	76	continue;
48842b30	77	}
48842b30 DG	78	lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
	79	lum.u.stream.channel_key = uchan->obj->shm_fd;
	80	lum.u.stream.stream_key = stream->obj->shm_fd;
	81	lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
d41f73b7 MD	82	/*
	83	* FIXME Hack alert! we force MMAP for now. Mixup
	84	* between EVENT and UST enums elsewhere.
	85	*/
	86	lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT;
48842b30	87	lum.u.stream.mmap_len = stream->obj->memory_map_size;
6df2e2c9 MD	88	lum.u.stream.uid = uid;
6df2e2c9 MD	89	lum.u.stream.gid = gid;
48842b30 DG	90	strncpy(lum.u.stream.path_name, stream->pathname, PATH_MAX - 1);
	91	lum.u.stream.path_name[PATH_MAX - 1] = '\0';
	92	DBG("Sending stream %d to consumer", lum.u.stream.stream_key);
	93	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
	94	if (ret < 0) {
	95	perror("send consumer stream");
	96	goto error;
	97	}
	98
	99	fds[0] = stream->obj->shm_fd;
	100	fds[1] = stream->obj->wait_fd;
	101	ret = lttcomm_send_fds_unix_sock(sock, fds, 2);
	102	if (ret < 0) {
	103	perror("send consumer stream ancillary data");
	104	goto error;
	105	}
48842b30	106	}
48842b30 DG	107
	108	DBG("consumer channel streams sent");
	109
	110	return 0;
	111
	112	error:
	113	return ret;
	114	}
	115
	116	/*
	117	* Send all stream fds of the UST session to the consumer.
	118	*/
	119	int ust_consumer_send_session(int consumer_fd, struct ust_app_session *usess)
	120	{
	121	int ret = 0;
	122	int sock = consumer_fd;
bec39940	123	struct lttng_ht_iter iter;
48842b30	124	struct lttcomm_consumer_msg lum;
bec39940	125	struct ust_app_channel *ua_chan;
48842b30 DG	126
	127	DBG("Sending metadata stream fd");
	128
7753dea8 MD	129	if (consumer_fd < 0) {
	130	ERR("Consumer has negative file descriptor");
	131	return -EINVAL;
	132	}
	133
48842b30	134	if (usess->metadata->obj->shm_fd != 0) {
8010679a	135	int fd;
48842b30 DG	136	int fds[2];
	137
	138	/* Send metadata channel fd */
	139	lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
	140	lum.u.channel.channel_key = usess->metadata->obj->shm_fd;
	141	lum.u.channel.max_sb_size = usess->metadata->attr.subbuf_size;
3ee75e9c	142	lum.u.channel.mmap_len = usess->metadata->obj->memory_map_size;
ee6b7fb2	143	DBG("Sending metadata channel %d to consumer", lum.u.channel.channel_key);
48842b30 DG	144	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
	145	if (ret < 0) {
	146	perror("send consumer channel");
	147	goto error;
	148	}
8010679a MD	149	fd = usess->metadata->obj->shm_fd;
8010679a MD	150	ret = lttcomm_send_fds_unix_sock(sock, &fd, 1);
48842b30 DG	151	if (ret < 0) {
	152	perror("send consumer metadata channel");
	153	goto error;
	154	}
	155
	156	/* Send metadata stream fd */
	157	lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
	158	lum.u.stream.channel_key = usess->metadata->obj->shm_fd;
	159	lum.u.stream.stream_key = usess->metadata->stream_obj->shm_fd;
	160	lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
	161	lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT;
	162	lum.u.stream.mmap_len = usess->metadata->stream_obj->memory_map_size;
6df2e2c9 MD	163	lum.u.stream.uid = usess->uid;
6df2e2c9 MD	164	lum.u.stream.gid = usess->gid;
48842b30 DG	165	strncpy(lum.u.stream.path_name, usess->metadata->pathname, PATH_MAX - 1);
	166	lum.u.stream.path_name[PATH_MAX - 1] = '\0';
	167	DBG("Sending metadata stream %d to consumer", lum.u.stream.stream_key);
	168	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
	169	if (ret < 0) {
	170	perror("send consumer metadata stream");
	171	goto error;
	172	}
	173	fds[0] = usess->metadata->stream_obj->shm_fd;
	174	fds[1] = usess->metadata->stream_obj->wait_fd;
	175	ret = lttcomm_send_fds_unix_sock(sock, fds, 2);
	176	if (ret < 0) {
	177	perror("send consumer stream");
	178	goto error;
	179	}
	180	}
	181
	182	/* Send each channel fd streams of session */
	183	rcu_read_lock();
bec39940 DG	184	cds_lfht_for_each_entry(usess->channels->ht, &iter.iter, ua_chan,
	185	node.node) {
	186	ret = send_channel_streams(sock, ua_chan, usess->uid, usess->gid);
48842b30	187	if (ret < 0) {
5485f822	188	rcu_read_unlock();
48842b30 DG	189	goto error;
48842b30 DG	190	}
48842b30 DG	191	}
	192	rcu_read_unlock();
	193
	194	DBG("consumer fds (metadata and channel streams) sent");
	195
	196	return 0;
	197
	198	error:
	199	return ret;
	200	}