[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 "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));
	CDS_INIT_LIST_HEAD(&dst->events.head);

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