[lttng-tools.git] / src / bin / 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, 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 <errno.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>

#include <common/common.h>
#include <common/consumer.h>
#include <common/defaults.h>
#include <common/sessiond-comm/sessiond-comm.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;
	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;
	}

	DBG("Sending channel shm path: %s\n", uchan->obj->shm_path);
	ret = lttcomm_send_string(sock,
				  uchan->obj->shm_path,
				  strlen(uchan->obj->shm_path));
	if (ret < 0) {
		PERROR("send consumer channel shm path");
		goto error;
	}

	cds_list_for_each_entry_safe(stream, tmp, &uchan->streams.head, list) {

		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;
		}

		DBG("Sending stream shm path: %s\n", stream->obj->shm_path);
		ret = lttcomm_send_string(sock,
					  stream->obj->shm_path,
					  strlen(stream->obj->shm_path));
		if (ret < 0) {
			PERROR("send consumer stream shm path");
			goto error;
		}

		DBG("Sending stream wait pipe path: %s\n", stream->obj->wait_pipe_path);
		ret = lttcomm_send_string(sock,
					  stream->obj->wait_pipe_path,
					  strlen(stream->obj->wait_pipe_path));

		if (ret < 0) {
			PERROR("send consumer stream wait pipe path");
			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) {
		/* 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;
		}

		DBG("Sending metadata channel shm path: %s\n", usess->metadata->obj->shm_path);
		ret = lttcomm_send_string(sock,
					  usess->metadata->obj->shm_path,
					  strlen(usess->metadata->obj->shm_path));
		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;
		}

		DBG("Sending metadata stream shm path: %s\n",
		    usess->metadata->stream_obj->shm_path);
		ret = lttcomm_send_string(sock,
					  usess->metadata->stream_obj->shm_path,
					  strlen(usess->metadata->stream_obj->shm_path));

		if (ret < 0) {
			PERROR("send consumer shm stream");
			goto error;
		}

		DBG("Sending metadata stream wait pipe path: %s\n",
		    usess->metadata->stream_obj->wait_pipe_path);
		ret = lttcomm_send_string(sock,
					  usess->metadata->stream_obj->wait_pipe_path,
					  strlen(usess->metadata->stream_obj->wait_pipe_path));

		if (ret < 0) {
			PERROR("send consumer shm 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) {
		/*
		 * Indicate that the channel was not created on the tracer side so skip
		 * sending unexisting streams.
		 */
		if (ua_chan->obj == NULL) {
			continue;
		}

		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	*
d14d33bf AM	4	* This program is free software; you can redistribute it and/or modify
	5	* it under the terms of the GNU General Public License, version 2 only,
	6	* as published by the Free Software Foundation.
48842b30	7	*
d14d33bf AM	8	* This program is distributed in the hope that it will be useful,
	9	* but WITHOUT ANY WARRANTY; without even the implied warranty of
	10	* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
	11	* GNU General Public License for more details.
48842b30	12	*
d14d33bf AM	13	* You should have received a copy of the GNU General Public License along
	14	* with this program; if not, write to the Free Software Foundation, Inc.,
	15	* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
48842b30 DG	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
990570ed	25	#include <common/common.h>
db758600	26	#include <common/consumer.h>
990570ed	27	#include <common/defaults.h>
10a8a223	28	#include <common/sessiond-comm/sessiond-comm.h>
48842b30	29
48842b30 DG	30	#include "ust-consumer.h"
	31
	32	/*
	33	* Send all stream fds of UST channel to the consumer.
	34	*/
	35	static int send_channel_streams(int sock,
6df2e2c9 MD	36	struct ust_app_channel *uchan,
6df2e2c9 MD	37	uid_t uid, gid_t gid)
48842b30	38	{
6684bfa4	39	int ret;
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) {
df0f840b	61	PERROR("send consumer channel");
48842b30 DG	62	goto error;
48842b30 DG	63	}
6684bfa4 CB	64
	65	DBG("Sending channel shm path: %s\n", uchan->obj->shm_path);
	66	ret = lttcomm_send_string(sock,
	67	uchan->obj->shm_path,
	68	strlen(uchan->obj->shm_path));
48842b30	69	if (ret < 0) {
6684bfa4	70	PERROR("send consumer channel shm path");
48842b30 DG	71	goto error;
	72	}
	73
d80a6244	74	cds_list_for_each_entry_safe(stream, tmp, &uchan->streams.head, list) {
48842b30 DG	75
48842b30 DG	76	if (!stream->obj->shm_fd) {
5af2f756	77	continue;
48842b30	78	}
48842b30 DG	79	lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
	80	lum.u.stream.channel_key = uchan->obj->shm_fd;
	81	lum.u.stream.stream_key = stream->obj->shm_fd;
	82	lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
d41f73b7 MD	83	/*
	84	* FIXME Hack alert! we force MMAP for now. Mixup
	85	* between EVENT and UST enums elsewhere.
	86	*/
	87	lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT;
48842b30	88	lum.u.stream.mmap_len = stream->obj->memory_map_size;
6df2e2c9 MD	89	lum.u.stream.uid = uid;
6df2e2c9 MD	90	lum.u.stream.gid = gid;
48842b30 DG	91	strncpy(lum.u.stream.path_name, stream->pathname, PATH_MAX - 1);
	92	lum.u.stream.path_name[PATH_MAX - 1] = '\0';
	93	DBG("Sending stream %d to consumer", lum.u.stream.stream_key);
	94	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
	95	if (ret < 0) {
df0f840b	96	PERROR("send consumer stream");
48842b30 DG	97	goto error;
	98	}
	99
6684bfa4 CB	100	DBG("Sending stream shm path: %s\n", stream->obj->shm_path);
	101	ret = lttcomm_send_string(sock,
	102	stream->obj->shm_path,
	103	strlen(stream->obj->shm_path));
48842b30	104	if (ret < 0) {
6684bfa4 CB	105	PERROR("send consumer stream shm path");
	106	goto error;
	107	}
	108
	109	DBG("Sending stream wait pipe path: %s\n", stream->obj->wait_pipe_path);
	110	ret = lttcomm_send_string(sock,
	111	stream->obj->wait_pipe_path,
	112	strlen(stream->obj->wait_pipe_path));
	113
	114	if (ret < 0) {
	115	PERROR("send consumer stream wait pipe path");
48842b30 DG	116	goto error;
48842b30 DG	117	}
48842b30	118	}
48842b30 DG	119
	120	DBG("consumer channel streams sent");
	121
	122	return 0;
	123
	124	error:
	125	return ret;
	126	}
	127
	128	/*
	129	* Send all stream fds of the UST session to the consumer.
	130	*/
	131	int ust_consumer_send_session(int consumer_fd, struct ust_app_session *usess)
	132	{
	133	int ret = 0;
	134	int sock = consumer_fd;
bec39940	135	struct lttng_ht_iter iter;
48842b30	136	struct lttcomm_consumer_msg lum;
bec39940	137	struct ust_app_channel *ua_chan;
48842b30 DG	138
	139	DBG("Sending metadata stream fd");
	140
7753dea8 MD	141	if (consumer_fd < 0) {
	142	ERR("Consumer has negative file descriptor");
	143	return -EINVAL;
	144	}
	145
48842b30	146	if (usess->metadata->obj->shm_fd != 0) {
48842b30 DG	147	/* Send metadata channel fd */
	148	lum.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL;
	149	lum.u.channel.channel_key = usess->metadata->obj->shm_fd;
	150	lum.u.channel.max_sb_size = usess->metadata->attr.subbuf_size;
3ee75e9c	151	lum.u.channel.mmap_len = usess->metadata->obj->memory_map_size;
ee6b7fb2	152	DBG("Sending metadata channel %d to consumer", lum.u.channel.channel_key);
48842b30 DG	153	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
48842b30 DG	154	if (ret < 0) {
df0f840b	155	PERROR("send consumer channel");
48842b30 DG	156	goto error;
48842b30 DG	157	}
6684bfa4 CB	158
	159	DBG("Sending metadata channel shm path: %s\n", usess->metadata->obj->shm_path);
	160	ret = lttcomm_send_string(sock,
	161	usess->metadata->obj->shm_path,
	162	strlen(usess->metadata->obj->shm_path));
48842b30	163	if (ret < 0) {
df0f840b	164	PERROR("send consumer metadata channel");
48842b30 DG	165	goto error;
	166	}
	167
	168	/* Send metadata stream fd */
	169	lum.cmd_type = LTTNG_CONSUMER_ADD_STREAM;
	170	lum.u.stream.channel_key = usess->metadata->obj->shm_fd;
	171	lum.u.stream.stream_key = usess->metadata->stream_obj->shm_fd;
	172	lum.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM;
	173	lum.u.stream.output = DEFAULT_UST_CHANNEL_OUTPUT;
	174	lum.u.stream.mmap_len = usess->metadata->stream_obj->memory_map_size;
6df2e2c9 MD	175	lum.u.stream.uid = usess->uid;
6df2e2c9 MD	176	lum.u.stream.gid = usess->gid;
48842b30 DG	177	strncpy(lum.u.stream.path_name, usess->metadata->pathname, PATH_MAX - 1);
	178	lum.u.stream.path_name[PATH_MAX - 1] = '\0';
	179	DBG("Sending metadata stream %d to consumer", lum.u.stream.stream_key);
	180	ret = lttcomm_send_unix_sock(sock, &lum, sizeof(lum));
	181	if (ret < 0) {
df0f840b	182	PERROR("send consumer metadata stream");
48842b30 DG	183	goto error;
48842b30 DG	184	}
6684bfa4 CB	185
	186	DBG("Sending metadata stream shm path: %s\n",
	187	usess->metadata->stream_obj->shm_path);
	188	ret = lttcomm_send_string(sock,
	189	usess->metadata->stream_obj->shm_path,
	190	strlen(usess->metadata->stream_obj->shm_path));
	191
48842b30	192	if (ret < 0) {
6684bfa4 CB	193	PERROR("send consumer shm stream");
	194	goto error;
	195	}
	196
	197	DBG("Sending metadata stream wait pipe path: %s\n",
	198	usess->metadata->stream_obj->wait_pipe_path);
	199	ret = lttcomm_send_string(sock,
	200	usess->metadata->stream_obj->wait_pipe_path,
	201	strlen(usess->metadata->stream_obj->wait_pipe_path));
	202
	203	if (ret < 0) {
	204	PERROR("send consumer shm stream");
48842b30 DG	205	goto error;
48842b30 DG	206	}
6684bfa4	207
48842b30 DG	208	}
	209
	210	/* Send each channel fd streams of session */
	211	rcu_read_lock();
bec39940 DG	212	cds_lfht_for_each_entry(usess->channels->ht, &iter.iter, ua_chan,
bec39940 DG	213	node.node) {
aeb96892 DG	214	/*
	215	* Indicate that the channel was not created on the tracer side so skip
	216	* sending unexisting streams.
	217	*/
	218	if (ua_chan->obj == NULL) {
	219	continue;
	220	}
	221
bec39940	222	ret = send_channel_streams(sock, ua_chan, usess->uid, usess->gid);
48842b30	223	if (ret < 0) {
5485f822	224	rcu_read_unlock();
48842b30 DG	225	goto error;
48842b30 DG	226	}
48842b30 DG	227	}
	228	rcu_read_unlock();
	229
	230	DBG("consumer fds (metadata and channel streams) sent");
	231
	232	return 0;
	233
	234	error:
	235	return ret;
	236	}