[lttng-tools.git] / ltt-sessiond / channel.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.
 */

#include <string.h>
#include <unistd.h>

#include <lttng/lttng.h>
#include <lttng-sessiond-comm.h>
#include <lttngerr.h>
#ifdef CONFIG_LTTNG_TOOLS_HAVE_UST
#include <ust/lttng-ust-ctl.h>
#include <ust/lttng-ust-abi.h>
#else
#include "lttng-ust-ctl.h"
#include "lttng-ust-abi.h"
#endif

#include "channel.h"
#include "hashtable.h"
#include "kernel-ctl.h"
#include "ust-ctl.h"
#include "utils.h"

/*
 * Return allocated channel attributes.
 */
struct lttng_channel *channel_new_default_attr(int dom)
{
	struct lttng_channel *chan;

	chan = zmalloc(sizeof(struct lttng_channel));
	if (chan == NULL) {
		perror("malloc channel init");
		goto error_alloc;
	}

	if (snprintf(chan->name, sizeof(chan->name), "%s",
				DEFAULT_CHANNEL_NAME) < 0) {
		perror("snprintf default channel name");
		goto error;
	}

	chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
	chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
	chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;

	switch (dom) {
		case LTTNG_DOMAIN_KERNEL:
			chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE;
			chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
			chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
			break;
		case LTTNG_DOMAIN_UST:
		case LTTNG_DOMAIN_UST_PID:
			chan->attr.subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE;
			chan->attr.num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM;
			chan->attr.output = DEFAULT_UST_CHANNEL_OUTPUT;
			break;
		default:
			goto error;	/* Not implemented */
	}

	return chan;

error:
	free(chan);
error_alloc:
	return NULL;
}

/*
 * Copy two ltt ust channel. Dst and src must be already allocated.
 */
int channel_ust_copy(struct ltt_ust_channel *dst,
		struct ltt_ust_channel *src)
{
	//struct ltt_ust_event *uevent, *new_uevent;

	memcpy(dst, src, sizeof(struct ltt_ust_channel));
	dst->events = hashtable_new_str(0);

	/*
	cds_list_for_each_entry(uevent, &src->events.head, list) {
		new_uevent = malloc(sizeof(struct ltt_ust_event));
		if (new_uevent == NULL) {
			perror("malloc ltt_ust_event");
			goto error;
		}

		memcpy(new_uevent, uevent, sizeof(struct ltt_ust_event));
		cds_list_add(&new_uevent->list, &dst->events.head);
		dst->events.count++;
	}
	*/

	return 0;

//error:
//	return -1;
}

/*
 * Disable kernel channel of the kernel session.
 */
int channel_kernel_disable(struct ltt_kernel_session *ksession,
		char *channel_name)
{
	int ret;
	struct ltt_kernel_channel *kchan;

	kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
	if (kchan == NULL) {
		ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
		goto error;
	} else if (kchan->enabled == 1) {
		ret = kernel_disable_channel(kchan);
		if (ret < 0) {
			if (ret != EEXIST) {
				ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL;
			}
			goto error;
		}
	}

	ret = LTTCOMM_OK;

error:
	return ret;
}

/*
 * Enable kernel channel of the kernel session.
 */
int channel_kernel_enable(struct ltt_kernel_session *ksession,
		struct ltt_kernel_channel *kchan)
{
	int ret;

	if (kchan->enabled == 0) {
		ret = kernel_enable_channel(kchan);
		if (ret < 0) {
			ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL;
			goto error;
		}
	}

	ret = LTTCOMM_OK;

error:
	return ret;
}

/*
 * Create kernel channel of the kernel session and notify kernel thread.
 */
int channel_kernel_create(struct ltt_kernel_session *ksession,
		struct lttng_channel *chan, int kernel_pipe)
{
	int ret;
	struct lttng_channel *attr = chan;

	/* Creating channel attributes if needed */
	if (attr == NULL) {
		/* FIXME: this appears to be a memory leak */
		attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
		if (attr == NULL) {
			ret = LTTCOMM_FATAL;
			goto error;
		}
	}

	/* Channel not found, creating it */
	ret = kernel_create_channel(ksession, attr, ksession->trace_path);
	if (ret < 0) {
		ret = LTTCOMM_KERN_CHAN_FAIL;
		goto error;
	}

	/* Notify kernel thread that there is a new channel */
	ret = notify_thread_pipe(kernel_pipe);
	if (ret < 0) {
		ret = LTTCOMM_FATAL;
		goto error;
	}

	ret = LTTCOMM_OK;

error:
	return ret;
}

/*
 * Create UST channel and enable it on the tracer.
 */
int channel_ust_create(struct ltt_ust_session *usession,
		struct lttng_channel *chan, int sock)
{
	int ret;
	struct lttng_channel *attr = chan;
	struct ltt_ust_channel *suchan;
	struct lttng_ust_channel_attr uattr;
	struct object_data *obj;

	/* Creating channel attributes if needed */
	if (attr == NULL) {
		/* FIXME: this appears to be a memory leak */
		/* TODO: get default for other UST domains */
		attr = channel_new_default_attr(LTTNG_DOMAIN_UST);
		if (attr == NULL) {
			ret = LTTCOMM_FATAL;
			goto error;
		}
	}

	suchan = trace_ust_create_channel(attr, usession->path);
	if (suchan == NULL) {
		ret = LTTCOMM_UST_CHAN_FAIL;
		goto error;
	}

	uattr.overwrite = attr->attr.overwrite;
	uattr.subbuf_size = attr->attr.subbuf_size;
	uattr.num_subbuf = attr->attr.num_subbuf;
	uattr.switch_timer_interval = attr->attr.switch_timer_interval;
	uattr.read_timer_interval = attr->attr.read_timer_interval;
	uattr.output = attr->attr.output;
	ret = ustctl_create_channel(sock, usession->handle,
			&uattr, &obj);
	if (ret < 0) {
		ret = LTTCOMM_UST_CHAN_FAIL;
		goto error;
	}

	suchan->attr.overwrite = uattr.overwrite;
	suchan->attr.subbuf_size = uattr.subbuf_size;
	suchan->attr.num_subbuf = uattr.num_subbuf;
	suchan->attr.switch_timer_interval = uattr.switch_timer_interval;
	suchan->attr.read_timer_interval = uattr.read_timer_interval;
	suchan->attr.output = uattr.output;
	suchan->handle = obj->handle;
	suchan->attr.shm_fd = obj->shm_fd;
	suchan->attr.wait_fd = obj->wait_fd;
	suchan->attr.memory_map_size = obj->memory_map_size;
	suchan->obj = obj;

	/* Add channel to session */
	cds_list_add(&suchan->list, &usession->channels.head);
	usession->channels.count++;

	DBG2("Channel %s UST create successfully for sock:%d", suchan->name, sock);

	ret = LTTCOMM_OK;

error:
	return ret;
}

/*
 * Enable UST channel on the tracer.
 */
int channel_ust_enable(struct ltt_ust_session *usession,
		struct ltt_ust_channel *uchan, int sock)
{
	int ret = LTTCOMM_OK;
	struct object_data obj;

	obj.handle = uchan->handle;
	obj.shm_fd = uchan->attr.shm_fd;
	obj.wait_fd = uchan->attr.wait_fd;
	obj.memory_map_size = uchan->attr.memory_map_size;
	ret = ustctl_enable(sock, &obj);
	if (ret < 0) {
		ret = LTTCOMM_UST_CHAN_FAIL;
		goto end;
	}
	ret = LTTCOMM_OK;
end:
	return ret;
}

/*
 * Disable UST channel on the tracer.
 */
int channel_ust_disable(struct ltt_ust_session *usession,
		struct ltt_ust_channel *uchan, int sock)
{
	int ret = LTTCOMM_OK;
	struct object_data obj;

	obj.handle = uchan->handle;
	obj.shm_fd = uchan->attr.shm_fd;
	obj.wait_fd = uchan->attr.wait_fd;
	obj.memory_map_size = uchan->attr.memory_map_size;
	ret = ustctl_disable(sock, &obj);
	if (ret < 0) {
		ret = LTTCOMM_UST_CHAN_FAIL;
		goto end;
	}
	ret = LTTCOMM_OK;
end:
	return ret;
}
Commit	Line	Data
54d01ffb 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
56fff090	18	#include <string.h>
54d01ffb DG	19	#include <unistd.h>
	20
	21	#include <lttng/lttng.h>
	22	#include <lttng-sessiond-comm.h>
	23	#include <lttngerr.h>
2bdd86d4 MD	24	#ifdef CONFIG_LTTNG_TOOLS_HAVE_UST
	25	#include <ust/lttng-ust-ctl.h>
	26	#include <ust/lttng-ust-abi.h>
	27	#else
	28	#include "lttng-ust-ctl.h"
	29	#include "lttng-ust-abi.h"
	30	#endif
54d01ffb DG	31
54d01ffb DG	32	#include "channel.h"
f6a9efaa	33	#include "hashtable.h"
54d01ffb	34	#include "kernel-ctl.h"
44d3bd01	35	#include "ust-ctl.h"
54d01ffb DG	36	#include "utils.h"
	37
	38	/*
	39	* Return allocated channel attributes.
	40	*/
f6cd6b0f	41	struct lttng_channel *channel_new_default_attr(int dom)
54d01ffb DG	42	{
	43	struct lttng_channel *chan;
	44
	45	chan = zmalloc(sizeof(struct lttng_channel));
	46	if (chan == NULL) {
	47	perror("malloc channel init");
	48	goto error_alloc;
	49	}
	50
44d3bd01 DG	51	if (snprintf(chan->name, sizeof(chan->name), "%s",
	52	DEFAULT_CHANNEL_NAME) < 0) {
	53	perror("snprintf default channel name");
54d01ffb DG	54	goto error;
	55	}
	56
	57	chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
	58	chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
	59	chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
	60
	61	switch (dom) {
	62	case LTTNG_DOMAIN_KERNEL:
	63	chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE;
	64	chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
	65	chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
	66	break;
2bdd86d4	67	case LTTNG_DOMAIN_UST:
44d3bd01 DG	68	case LTTNG_DOMAIN_UST_PID:
	69	chan->attr.subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE;
	70	chan->attr.num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM;
	71	chan->attr.output = DEFAULT_UST_CHANNEL_OUTPUT;
	72	break;
54d01ffb DG	73	default:
	74	goto error; /* Not implemented */
	75	}
	76
	77	return chan;
	78
	79	error:
	80	free(chan);
	81	error_alloc:
	82	return NULL;
	83	}
	84
56fff090 DG	85	/*
	86	* Copy two ltt ust channel. Dst and src must be already allocated.
	87	*/
	88	int channel_ust_copy(struct ltt_ust_channel *dst,
	89	struct ltt_ust_channel *src)
	90	{
f6a9efaa	91	//struct ltt_ust_event uevent, new_uevent;
56fff090 DG	92
56fff090 DG	93	memcpy(dst, src, sizeof(struct ltt_ust_channel));
f6a9efaa	94	dst->events = hashtable_new_str(0);
56fff090	95
f6a9efaa	96	/*
56fff090 DG	97	cds_list_for_each_entry(uevent, &src->events.head, list) {
	98	new_uevent = malloc(sizeof(struct ltt_ust_event));
	99	if (new_uevent == NULL) {
	100	perror("malloc ltt_ust_event");
	101	goto error;
	102	}
	103
	104	memcpy(new_uevent, uevent, sizeof(struct ltt_ust_event));
	105	cds_list_add(&new_uevent->list, &dst->events.head);
	106	dst->events.count++;
	107	}
f6a9efaa	108	*/
56fff090 DG	109
	110	return 0;
	111
f6a9efaa DG	112	//error:
f6a9efaa DG	113	// return -1;
56fff090 DG	114	}
56fff090 DG	115
54d01ffb DG	116	/*
	117	* Disable kernel channel of the kernel session.
	118	*/
	119	int channel_kernel_disable(struct ltt_kernel_session *ksession,
	120	char *channel_name)
	121	{
	122	int ret;
	123	struct ltt_kernel_channel *kchan;
	124
	125	kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
	126	if (kchan == NULL) {
	127	ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
	128	goto error;
	129	} else if (kchan->enabled == 1) {
	130	ret = kernel_disable_channel(kchan);
	131	if (ret < 0) {
	132	if (ret != EEXIST) {
	133	ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL;
	134	}
	135	goto error;
	136	}
	137	}
	138
	139	ret = LTTCOMM_OK;
	140
	141	error:
	142	return ret;
	143	}
	144
	145	/*
	146	* Enable kernel channel of the kernel session.
	147	*/
	148	int channel_kernel_enable(struct ltt_kernel_session *ksession,
	149	struct ltt_kernel_channel *kchan)
	150	{
	151	int ret;
	152
	153	if (kchan->enabled == 0) {
	154	ret = kernel_enable_channel(kchan);
	155	if (ret < 0) {
	156	ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL;
	157	goto error;
	158	}
	159	}
	160
	161	ret = LTTCOMM_OK;
	162
	163	error:
	164	return ret;
	165	}
	166
	167	/*
	168	* Create kernel channel of the kernel session and notify kernel thread.
	169	*/
	170	int channel_kernel_create(struct ltt_kernel_session *ksession,
44d3bd01	171	struct lttng_channel *chan, int kernel_pipe)
54d01ffb DG	172	{
	173	int ret;
	174	struct lttng_channel *attr = chan;
	175
	176	/* Creating channel attributes if needed */
	177	if (attr == NULL) {
2bdd86d4	178	/* FIXME: this appears to be a memory leak */
f6cd6b0f	179	attr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
54d01ffb DG	180	if (attr == NULL) {
	181	ret = LTTCOMM_FATAL;
	182	goto error;
	183	}
	184	}
	185
	186	/* Channel not found, creating it */
	187	ret = kernel_create_channel(ksession, attr, ksession->trace_path);
	188	if (ret < 0) {
	189	ret = LTTCOMM_KERN_CHAN_FAIL;
	190	goto error;
	191	}
	192
	193	/* Notify kernel thread that there is a new channel */
	194	ret = notify_thread_pipe(kernel_pipe);
	195	if (ret < 0) {
	196	ret = LTTCOMM_FATAL;
	197	goto error;
	198	}
	199
	200	ret = LTTCOMM_OK;
	201
	202	error:
	203	return ret;
	204	}
44d3bd01 DG	205
	206	/*
	207	* Create UST channel and enable it on the tracer.
	208	*/
	209	int channel_ust_create(struct ltt_ust_session *usession,
	210	struct lttng_channel *chan, int sock)
	211	{
	212	int ret;
	213	struct lttng_channel *attr = chan;
2bdd86d4 MD	214	struct ltt_ust_channel *suchan;
	215	struct lttng_ust_channel_attr uattr;
	216	struct object_data *obj;
44d3bd01 DG	217
	218	/* Creating channel attributes if needed */
	219	if (attr == NULL) {
2bdd86d4 MD	220	/* FIXME: this appears to be a memory leak */
	221	/* TODO: get default for other UST domains */
	222	attr = channel_new_default_attr(LTTNG_DOMAIN_UST);
44d3bd01 DG	223	if (attr == NULL) {
	224	ret = LTTCOMM_FATAL;
	225	goto error;
	226	}
	227	}
	228
2bdd86d4 MD	229	suchan = trace_ust_create_channel(attr, usession->path);
2bdd86d4 MD	230	if (suchan == NULL) {
f6a9efaa	231	ret = LTTCOMM_UST_CHAN_FAIL;
2bdd86d4 MD	232	goto error;
2bdd86d4 MD	233	}
f6a9efaa	234
2bdd86d4 MD	235	uattr.overwrite = attr->attr.overwrite;
	236	uattr.subbuf_size = attr->attr.subbuf_size;
	237	uattr.num_subbuf = attr->attr.num_subbuf;
	238	uattr.switch_timer_interval = attr->attr.switch_timer_interval;
	239	uattr.read_timer_interval = attr->attr.read_timer_interval;
	240	uattr.output = attr->attr.output;
	241	ret = ustctl_create_channel(sock, usession->handle,
	242	&uattr, &obj);
44d3bd01 DG	243	if (ret < 0) {
	244	ret = LTTCOMM_UST_CHAN_FAIL;
	245	goto error;
	246	}
f6a9efaa	247
2bdd86d4 MD	248	suchan->attr.overwrite = uattr.overwrite;
	249	suchan->attr.subbuf_size = uattr.subbuf_size;
	250	suchan->attr.num_subbuf = uattr.num_subbuf;
	251	suchan->attr.switch_timer_interval = uattr.switch_timer_interval;
	252	suchan->attr.read_timer_interval = uattr.read_timer_interval;
	253	suchan->attr.output = uattr.output;
	254	suchan->handle = obj->handle;
	255	suchan->attr.shm_fd = obj->shm_fd;
	256	suchan->attr.wait_fd = obj->wait_fd;
	257	suchan->attr.memory_map_size = obj->memory_map_size;
	258	suchan->obj = obj;
	259
	260	/* Add channel to session */
	261	cds_list_add(&suchan->list, &usession->channels.head);
	262	usession->channels.count++;
	263
	264	DBG2("Channel %s UST create successfully for sock:%d", suchan->name, sock);
44d3bd01 DG	265
	266	ret = LTTCOMM_OK;
	267
	268	error:
	269	return ret;
	270	}
	271
	272	/*
	273	* Enable UST channel on the tracer.
	274	*/
	275	int channel_ust_enable(struct ltt_ust_session *usession,
	276	struct ltt_ust_channel *uchan, int sock)
	277	{
2bdd86d4 MD	278	int ret = LTTCOMM_OK;
	279	struct object_data obj;
	280
	281	obj.handle = uchan->handle;
	282	obj.shm_fd = uchan->attr.shm_fd;
	283	obj.wait_fd = uchan->attr.wait_fd;
	284	obj.memory_map_size = uchan->attr.memory_map_size;
	285	ret = ustctl_enable(sock, &obj);
44d3bd01 DG	286	if (ret < 0) {
44d3bd01 DG	287	ret = LTTCOMM_UST_CHAN_FAIL;
2bdd86d4	288	goto end;
44d3bd01	289	}
44d3bd01	290	ret = LTTCOMM_OK;
2bdd86d4	291	end:
44d3bd01 DG	292	return ret;
	293	}
	294
	295	/*
	296	* Disable UST channel on the tracer.
	297	*/
	298	int channel_ust_disable(struct ltt_ust_session *usession,
	299	struct ltt_ust_channel *uchan, int sock)
	300	{
2bdd86d4 MD	301	int ret = LTTCOMM_OK;
	302	struct object_data obj;
	303
	304	obj.handle = uchan->handle;
	305	obj.shm_fd = uchan->attr.shm_fd;
	306	obj.wait_fd = uchan->attr.wait_fd;
	307	obj.memory_map_size = uchan->attr.memory_map_size;
	308	ret = ustctl_disable(sock, &obj);
44d3bd01 DG	309	if (ret < 0) {
44d3bd01 DG	310	ret = LTTCOMM_UST_CHAN_FAIL;
2bdd86d4	311	goto end;
44d3bd01	312	}
44d3bd01	313	ret = LTTCOMM_OK;
2bdd86d4	314	end:
44d3bd01 DG	315	return ret;
44d3bd01 DG	316	}