[lttng-tools.git] / lttng-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.
 */

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

#include <lttng/lttng.h>
#include <lttng-ht.h>
#include <lttng-sessiond-comm.h>
#include <lttngerr.h>

#include "channel.h"
#include "kernel.h"
#include "ust-ctl.h"
#include "utils.h"
#include "ust-app.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("zmalloc 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;
}

/*
 * 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 && 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 *attr, int kernel_pipe)
{
	int ret;
	struct lttng_channel *defattr = NULL;

	/* Creating channel attributes if needed */
	if (attr == NULL) {
		defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
		if (defattr == NULL) {
			ret = LTTCOMM_FATAL;
			goto error;
		}
		attr = defattr;
	}

	/* 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:
	free(defattr);
	return ret;
}

/*
 * Enable UST channel for session and domain.
 */
int channel_ust_enable(struct ltt_ust_session *usess, int domain,
		struct ltt_ust_channel *uchan)
{
	int ret = LTTCOMM_OK;

	/* If already enabled, everything is OK */
	if (uchan->enabled) {
		DBG3("Channel %s already enabled. Skipping", uchan->name);
		goto end;
	}

	switch (domain) {
	case LTTNG_DOMAIN_UST:
		DBG2("Channel %s being enabled in UST global domain", uchan->name);
		/* Enable channel for global domain */
		ret = ust_app_enable_channel_glb(usess, uchan);
		break;
	case LTTNG_DOMAIN_UST_PID:
	case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
	case LTTNG_DOMAIN_UST_EXEC_NAME:
		ret = LTTCOMM_NOT_IMPLEMENTED;
		goto error;
	}

	if (ret < 0) {
		if (ret != -EEXIST) {
			ret = LTTCOMM_UST_CHAN_ENABLE_FAIL;
			goto error;
		} else {
			ret = LTTCOMM_OK;
		}
	}

	uchan->enabled = 1;
	DBG2("Channel %s enabled successfully", uchan->name);

end:
error:
	return ret;
}

/*
 * Create UST channel for session and domain.
 */
int channel_ust_create(struct ltt_ust_session *usess, int domain,
		struct lttng_channel *attr)
{
	int ret = LTTCOMM_OK;
	struct lttng_ht *chan_ht;
	struct ltt_ust_channel *uchan = NULL;
	struct lttng_channel *defattr = NULL;

	/* Creating channel attributes if needed */
	if (attr == NULL) {
		defattr = channel_new_default_attr(domain);
		if (defattr == NULL) {
			ret = LTTCOMM_FATAL;
			goto error;
		}
		attr = defattr;
	}

	/* Create UST channel */
	uchan = trace_ust_create_channel(attr, usess->pathname);
	if (uchan == NULL) {
		ret = LTTCOMM_FATAL;
		goto error;
	}

	switch (domain) {
	case LTTNG_DOMAIN_UST:
		DBG2("Channel %s being created in UST global domain", uchan->name);
		chan_ht = usess->domain_global.channels;

		/* Enable channel for global domain */
		ret = ust_app_create_channel_glb(usess, uchan);
		break;
	case LTTNG_DOMAIN_UST_PID:
	case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
	case LTTNG_DOMAIN_UST_EXEC_NAME:
	default:
		ret = LTTCOMM_NOT_IMPLEMENTED;
		goto error_free_chan;
	}

	if (ret < 0 && ret != -EEXIST) {
		ret = LTTCOMM_UST_CHAN_ENABLE_FAIL;
		goto error_free_chan;
	}

	uchan->enabled = 1;
	lttng_ht_add_unique_str(chan_ht, &uchan->node);
	DBG2("Channel %s created successfully", uchan->name);

	free(defattr);
	return LTTCOMM_OK;

error_free_chan:
	trace_ust_destroy_channel(uchan);
error:
	free(defattr);
	return ret;
}

/*
 * Disable UST channel for session and domain.
 */
int channel_ust_disable(struct ltt_ust_session *usess, int domain,
		struct ltt_ust_channel *uchan)
{
	int ret = LTTCOMM_OK;

	/* Already disabled */
	if (uchan->enabled == 0) {
		DBG2("Channel UST %s already disabled", uchan->name);
		goto end;
	}

	/* Get the right channel's hashtable */
	switch (domain) {
	case LTTNG_DOMAIN_UST:
		DBG2("Channel %s being disabled in UST global domain", uchan->name);
		/* Disable channel for global domain */
		ret = ust_app_disable_channel_glb(usess, uchan);
		break;
	case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
	case LTTNG_DOMAIN_UST_EXEC_NAME:
	case LTTNG_DOMAIN_UST_PID:
		ret = LTTCOMM_NOT_IMPLEMENTED;
		goto error;
	}

	if (ret < 0 && ret != -EEXIST) {
		ret = LTTCOMM_UST_DISABLE_FAIL;
		goto error;
	}

	uchan->enabled = 0;

	DBG2("Channel %s disabled successfully", uchan->name);

	return LTTCOMM_OK;

end:
error:
	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
7885e399	18	#define _GNU_SOURCE
56fff090	19	#include <string.h>
54d01ffb DG	20	#include <unistd.h>
	21
	22	#include <lttng/lttng.h>
bec39940	23	#include <lttng-ht.h>
54d01ffb DG	24	#include <lttng-sessiond-comm.h>
	25	#include <lttngerr.h>
	26
	27	#include "channel.h"
4771f025	28	#include "kernel.h"
44d3bd01	29	#include "ust-ctl.h"
54d01ffb	30	#include "utils.h"
7885e399	31	#include "ust-app.h"
54d01ffb DG	32
	33	/*
	34	* Return allocated channel attributes.
	35	*/
f6cd6b0f	36	struct lttng_channel *channel_new_default_attr(int dom)
54d01ffb DG	37	{
	38	struct lttng_channel *chan;
	39
	40	chan = zmalloc(sizeof(struct lttng_channel));
	41	if (chan == NULL) {
7885e399	42	PERROR("zmalloc channel init");
54d01ffb DG	43	goto error_alloc;
	44	}
	45
44d3bd01 DG	46	if (snprintf(chan->name, sizeof(chan->name), "%s",
44d3bd01 DG	47	DEFAULT_CHANNEL_NAME) < 0) {
7885e399	48	PERROR("snprintf default channel name");
54d01ffb DG	49	goto error;
	50	}
	51
	52	chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
	53	chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER;
	54	chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER;
	55
	56	switch (dom) {
1b1c65fa MD	57	case LTTNG_DOMAIN_KERNEL:
	58	chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE;
	59	chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM;
	60	chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT;
	61	break;
	62	case LTTNG_DOMAIN_UST:
	63	case LTTNG_DOMAIN_UST_PID:
	64	chan->attr.subbuf_size = DEFAULT_UST_CHANNEL_SUBBUF_SIZE;
	65	chan->attr.num_subbuf = DEFAULT_UST_CHANNEL_SUBBUF_NUM;
	66	chan->attr.output = DEFAULT_UST_CHANNEL_OUTPUT;
	67	break;
	68	default:
	69	goto error; /* Not implemented */
54d01ffb DG	70	}
	71
	72	return chan;
	73
	74	error:
	75	free(chan);
	76	error_alloc:
	77	return NULL;
	78	}
	79
	80	/*
	81	* Disable kernel channel of the kernel session.
	82	*/
	83	int channel_kernel_disable(struct ltt_kernel_session *ksession,
	84	char *channel_name)
	85	{
	86	int ret;
	87	struct ltt_kernel_channel *kchan;
	88
	89	kchan = trace_kernel_get_channel_by_name(channel_name, ksession);
	90	if (kchan == NULL) {
	91	ret = LTTCOMM_KERN_CHAN_NOT_FOUND;
	92	goto error;
	93	} else if (kchan->enabled == 1) {
	94	ret = kernel_disable_channel(kchan);
7885e399 DG	95	if (ret < 0 && ret != -EEXIST) {
7885e399 DG	96	ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL;
54d01ffb DG	97	goto error;
	98	}
	99	}
	100
	101	ret = LTTCOMM_OK;
	102
	103	error:
	104	return ret;
	105	}
	106
	107	/*
	108	* Enable kernel channel of the kernel session.
	109	*/
	110	int channel_kernel_enable(struct ltt_kernel_session *ksession,
	111	struct ltt_kernel_channel *kchan)
	112	{
	113	int ret;
	114
	115	if (kchan->enabled == 0) {
	116	ret = kernel_enable_channel(kchan);
	117	if (ret < 0) {
	118	ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL;
	119	goto error;
	120	}
	121	}
	122
	123	ret = LTTCOMM_OK;
	124
	125	error:
	126	return ret;
	127	}
	128
	129	/*
	130	* Create kernel channel of the kernel session and notify kernel thread.
	131	*/
	132	int channel_kernel_create(struct ltt_kernel_session *ksession,
ff4d74e6	133	struct lttng_channel *attr, int kernel_pipe)
54d01ffb DG	134	{
54d01ffb DG	135	int ret;
ff4d74e6	136	struct lttng_channel *defattr = NULL;
54d01ffb DG	137
	138	/* Creating channel attributes if needed */
	139	if (attr == NULL) {
ff4d74e6 MD	140	defattr = channel_new_default_attr(LTTNG_DOMAIN_KERNEL);
ff4d74e6 MD	141	if (defattr == NULL) {
54d01ffb DG	142	ret = LTTCOMM_FATAL;
	143	goto error;
	144	}
ff4d74e6	145	attr = defattr;
54d01ffb DG	146	}
	147
	148	/* Channel not found, creating it */
	149	ret = kernel_create_channel(ksession, attr, ksession->trace_path);
	150	if (ret < 0) {
	151	ret = LTTCOMM_KERN_CHAN_FAIL;
	152	goto error;
	153	}
	154
	155	/* Notify kernel thread that there is a new channel */
	156	ret = notify_thread_pipe(kernel_pipe);
	157	if (ret < 0) {
	158	ret = LTTCOMM_FATAL;
	159	goto error;
	160	}
	161
	162	ret = LTTCOMM_OK;
54d01ffb	163	error:
ff4d74e6	164	free(defattr);
54d01ffb DG	165	return ret;
54d01ffb DG	166	}
7885e399 DG	167
	168	/*
	169	* Enable UST channel for session and domain.
	170	*/
	171	int channel_ust_enable(struct ltt_ust_session *usess, int domain,
	172	struct ltt_ust_channel *uchan)
	173	{
	174	int ret = LTTCOMM_OK;
	175
	176	/* If already enabled, everything is OK */
	177	if (uchan->enabled) {
	178	DBG3("Channel %s already enabled. Skipping", uchan->name);
	179	goto end;
	180	}
	181
	182	switch (domain) {
	183	case LTTNG_DOMAIN_UST:
	184	DBG2("Channel %s being enabled in UST global domain", uchan->name);
	185	/* Enable channel for global domain */
	186	ret = ust_app_enable_channel_glb(usess, uchan);
	187	break;
	188	case LTTNG_DOMAIN_UST_PID:
	189	case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
	190	case LTTNG_DOMAIN_UST_EXEC_NAME:
	191	ret = LTTCOMM_NOT_IMPLEMENTED;
	192	goto error;
	193	}
	194
	195	if (ret < 0) {
	196	if (ret != -EEXIST) {
	197	ret = LTTCOMM_UST_CHAN_ENABLE_FAIL;
	198	goto error;
	199	} else {
	200	ret = LTTCOMM_OK;
	201	}
	202	}
	203
	204	uchan->enabled = 1;
	205	DBG2("Channel %s enabled successfully", uchan->name);
	206
	207	end:
	208	error:
	209	return ret;
	210	}
	211
	212	/*
	213	* Create UST channel for session and domain.
	214	*/
	215	int channel_ust_create(struct ltt_ust_session *usess, int domain,
	216	struct lttng_channel *attr)
	217	{
	218	int ret = LTTCOMM_OK;
bec39940	219	struct lttng_ht *chan_ht;
7885e399 DG	220	struct ltt_ust_channel *uchan = NULL;
	221	struct lttng_channel *defattr = NULL;
	222
	223	/* Creating channel attributes if needed */
	224	if (attr == NULL) {
	225	defattr = channel_new_default_attr(domain);
	226	if (defattr == NULL) {
	227	ret = LTTCOMM_FATAL;
	228	goto error;
	229	}
	230	attr = defattr;
	231	}
	232
	233	/* Create UST channel */
	234	uchan = trace_ust_create_channel(attr, usess->pathname);
	235	if (uchan == NULL) {
	236	ret = LTTCOMM_FATAL;
	237	goto error;
	238	}
	239
	240	switch (domain) {
	241	case LTTNG_DOMAIN_UST:
	242	DBG2("Channel %s being created in UST global domain", uchan->name);
	243	chan_ht = usess->domain_global.channels;
	244
	245	/* Enable channel for global domain */
	246	ret = ust_app_create_channel_glb(usess, uchan);
	247	break;
	248	case LTTNG_DOMAIN_UST_PID:
	249	case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
	250	case LTTNG_DOMAIN_UST_EXEC_NAME:
	251	default:
	252	ret = LTTCOMM_NOT_IMPLEMENTED;
	253	goto error_free_chan;
	254	}
	255
	256	if (ret < 0 && ret != -EEXIST) {
	257	ret = LTTCOMM_UST_CHAN_ENABLE_FAIL;
	258	goto error_free_chan;
	259	}
	260
	261	uchan->enabled = 1;
bec39940	262	lttng_ht_add_unique_str(chan_ht, &uchan->node);
7885e399 DG	263	DBG2("Channel %s created successfully", uchan->name);
	264
	265	free(defattr);
	266	return LTTCOMM_OK;
	267
	268	error_free_chan:
	269	trace_ust_destroy_channel(uchan);
	270	error:
	271	free(defattr);
	272	return ret;
	273	}
	274
	275	/*
	276	* Disable UST channel for session and domain.
	277	*/
	278	int channel_ust_disable(struct ltt_ust_session *usess, int domain,
	279	struct ltt_ust_channel *uchan)
	280	{
	281	int ret = LTTCOMM_OK;
7885e399 DG	282
	283	/* Already disabled */
	284	if (uchan->enabled == 0) {
	285	DBG2("Channel UST %s already disabled", uchan->name);
	286	goto end;
	287	}
	288
	289	/* Get the right channel's hashtable */
	290	switch (domain) {
	291	case LTTNG_DOMAIN_UST:
	292	DBG2("Channel %s being disabled in UST global domain", uchan->name);
7885e399 DG	293	/* Disable channel for global domain */
	294	ret = ust_app_disable_channel_glb(usess, uchan);
	295	break;
	296	case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
	297	case LTTNG_DOMAIN_UST_EXEC_NAME:
	298	case LTTNG_DOMAIN_UST_PID:
	299	ret = LTTCOMM_NOT_IMPLEMENTED;
	300	goto error;
	301	}
	302
	303	if (ret < 0 && ret != -EEXIST) {
	304	ret = LTTCOMM_UST_DISABLE_FAIL;
	305	goto error;
	306	}
	307
	308	uchan->enabled = 0;
	309
	310	DBG2("Channel %s disabled successfully", uchan->name);
	311
	312	return LTTCOMM_OK;
	313
	314	end:
	315	error:
	316	return ret;
	317	}