[lttng-tools.git] / ltt-sessiond / event.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 <errno.h>
#include <urcu/list.h>
#include <string.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>
#else
#include "lttng-ust-ctl.h"
#endif

#include "channel.h"
#include "event.h"
#include "kernel-ctl.h"

/*
 * Setup a lttng_event used to enable *all* syscall tracing.
 */
static void init_syscalls_kernel_event(struct lttng_event *event)
{
	event->name[0] = '\0';
	/*
	 * We use LTTNG_EVENT* here since the trace kernel creation will make the
	 * right changes for the kernel.
	 */
	event->type = LTTNG_EVENT_SYSCALL;
}

/*
 * Disable kernel tracepoint event for a channel from the kernel session.
 */
int event_kernel_disable_tracepoint(struct ltt_kernel_session *ksession,
		struct ltt_kernel_channel *kchan, char *event_name)
{
	int ret;
	struct ltt_kernel_event *kevent;

	kevent = trace_kernel_get_event_by_name(event_name, kchan);
	if (kevent == NULL) {
		ret = LTTCOMM_NO_EVENT;
		goto error;
	}

	ret = kernel_disable_event(kevent);
	if (ret < 0) {
		ret = LTTCOMM_KERN_DISABLE_FAIL;
		goto error;
	}

	DBG("Kernel event %s disable for channel %s.",
			kevent->event->name, kchan->channel->name);

	ret = LTTCOMM_OK;

error:
	return ret;
}

/*
 * Disable kernel tracepoint events for a channel from the kernel session.
 */
int event_kernel_disable_all_tracepoints(struct ltt_kernel_session *ksession,
		struct ltt_kernel_channel *kchan)
{
	int ret;
	struct ltt_kernel_event *kevent;

	/* For each event in the kernel session */
	cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
		ret = kernel_disable_event(kevent);
		if (ret < 0) {
			/* We continue disabling the rest */
			continue;
		}
	}
	ret = LTTCOMM_OK;
	return ret;
}

/*
 * Disable kernel syscall events for a channel from the kernel session.
 */
int event_kernel_disable_all_syscalls(struct ltt_kernel_session *ksession,
		struct ltt_kernel_channel *kchan)
{
	ERR("Cannot disable syscall tracing for existing session. Please destroy session instead.");
	return LTTCOMM_OK;	/* Return OK so disable all succeeds */
}

/*
 * Disable all kernel event for a channel from the kernel session.
 */
int event_kernel_disable_all(struct ltt_kernel_session *ksession,
		struct ltt_kernel_channel *kchan)
{
	int ret;

	ret = event_kernel_disable_all_tracepoints(ksession, kchan);
	if (ret != LTTCOMM_OK)
		return ret;
	ret = event_kernel_disable_all_syscalls(ksession, kchan);
	return ret;
}

/*
 * Enable kernel tracepoint event for a channel from the kernel session.
 */
int event_kernel_enable_tracepoint(struct ltt_kernel_session *ksession,
		struct ltt_kernel_channel *kchan, struct lttng_event *event)
{
	int ret;
	struct ltt_kernel_event *kevent;

	kevent = trace_kernel_get_event_by_name(event->name, kchan);
	if (kevent == NULL) {
		ret = kernel_create_event(event, kchan);
		if (ret < 0) {
			if (ret == -EEXIST) {
				ret = LTTCOMM_KERN_EVENT_EXIST;
			} else {
				ret = LTTCOMM_KERN_ENABLE_FAIL;
			}
			goto end;
		}
	} else if (kevent->enabled == 0) {
		ret = kernel_enable_event(kevent);
		if (ret < 0) {
			ret = LTTCOMM_KERN_ENABLE_FAIL;
			goto end;
		}
	}
	ret = LTTCOMM_OK;
end:
	return ret;
}

/*
 * Enable all kernel tracepoint events of a channel of the kernel session.
 */
int event_kernel_enable_all_tracepoints(struct ltt_kernel_session *ksession,
		struct ltt_kernel_channel *kchan, int kernel_tracer_fd)
{
	int size, i, ret;
	struct ltt_kernel_event *kevent;
	struct lttng_event *event_list;

	/* For each event in the kernel session */
	cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
		ret = kernel_enable_event(kevent);
		if (ret < 0) {
			/* Enable failed but still continue */
			continue;
		}
	}

	size = kernel_list_events(kernel_tracer_fd, &event_list);
	if (size < 0) {
		ret = LTTCOMM_KERN_LIST_FAIL;
		goto end;
	}

	for (i = 0; i < size; i++) {
		kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan);
		if (kevent == NULL) {
			/* Default event type for enable all */
			event_list[i].type = LTTNG_EVENT_TRACEPOINT;
			/* Enable each single tracepoint event */
			ret = kernel_create_event(&event_list[i], kchan);
			if (ret < 0) {
				/* Ignore error here and continue */
			}
		}
	}
	free(event_list);
	ret = LTTCOMM_OK;
end:
	return ret;

}

/*
 * Enable all kernel tracepoint events of a channel of the kernel session.
 */
int event_kernel_enable_all_syscalls(struct ltt_kernel_session *ksession,
		struct ltt_kernel_channel *kchan, int kernel_tracer_fd)
{
	int ret;
	struct lttng_event event;

	init_syscalls_kernel_event(&event);

	DBG("Enabling all syscall tracing");

	ret = kernel_create_event(&event, kchan);
	if (ret < 0) {
		goto end;
	}
	ret = LTTCOMM_OK;
end:
	return ret;
}

/*
 * Enable all kernel events of a channel of the kernel session.
 */
int event_kernel_enable_all(struct ltt_kernel_session *ksession,
		struct ltt_kernel_channel *kchan, int kernel_tracer_fd)
{
	int ret;

	ret = event_kernel_enable_all_tracepoints(ksession, kchan, kernel_tracer_fd);
	if (ret != LTTCOMM_OK) {
		goto end;
	}
	ret = event_kernel_enable_all_syscalls(ksession, kchan, kernel_tracer_fd);
end:
	return ret;
}

/*
 * Enable UST tracepoint event for a channel from a UST session.
 */
int event_ust_enable_tracepoint(struct ltt_ust_session *ustsession,
		struct ltt_ust_channel *ustchan, struct lttng_event *event)
{
	int ret;
	struct ltt_ust_event *ustevent;
	struct lttng_ust_event lttngustevent;
	struct object_data *object_event;

	ustevent = trace_ust_get_event_by_name(event->name, ustchan);
	if (ustevent == NULL) {
		ustevent = trace_ust_create_event(event);
		if (ustevent == NULL) {
			ret = -1;
			goto end;
		}
		strncpy(lttngustevent.name, event->name,
			LTTNG_UST_SYM_NAME_LEN);
		lttngustevent.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
		/* TODO: adjust to other instrumentation types */
		lttngustevent.instrumentation = LTTNG_UST_TRACEPOINT;
		ret = ustctl_create_event(ustsession->sock, &lttngustevent,
			ustchan->obj, &object_event);
		if (ret < 0) {
			if (ret == -EEXIST) {
				ret = LTTCOMM_KERN_EVENT_EXIST;
			} else {
				ret = LTTCOMM_KERN_ENABLE_FAIL;
			}
			goto end;
		}
		ustevent->obj = object_event;
		ustevent->handle = object_event->handle;
		ustevent->enabled = 1;
		/* Add event to event list */
		cds_list_add(&ustevent->list, &ustchan->events.head);
		ustchan->events.count++;
	} else if (ustevent->enabled == 0) {
		ret = ustctl_enable(ustsession->sock, ustevent->obj);
		if (ret < 0) {
			ret = LTTCOMM_KERN_ENABLE_FAIL;
			goto end;
		}
		ustevent->enabled = 1;
	}
	ret = LTTCOMM_OK;
end:
	return ret;
}

int event_ust_disable_tracepoint(struct ltt_ust_session *ustsession,
		struct ltt_ust_channel *ustchan, char *event_name)
{
	int ret;
	struct ltt_ust_event *ustevent;

	ustevent = trace_ust_get_event_by_name(event_name, ustchan);
	if (ustevent == NULL) {
		ret = LTTCOMM_NO_EVENT;
		goto end;
	}
	ret = ustctl_disable(ustsession->sock, ustevent->obj);
	if (ret < 0) {
		ret = LTTCOMM_UST_ENABLE_FAIL;
		goto end;
	}
	ustevent->enabled = 0;
	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
d87bfb32	18	#include <errno.h>
54d01ffb	19	#include <urcu/list.h>
2bdd86d4	20	#include <string.h>
54d01ffb DG	21
	22	#include <lttng/lttng.h>
	23	#include <lttng-sessiond-comm.h>
	24	#include <lttngerr.h>
	25
2bdd86d4 MD	26	#ifdef CONFIG_LTTNG_TOOLS_HAVE_UST
	27	#include <ust/lttng-ust-ctl.h>
	28	#else
	29	#include "lttng-ust-ctl.h"
	30	#endif
	31
54d01ffb DG	32	#include "channel.h"
	33	#include "event.h"
	34	#include "kernel-ctl.h"
	35
8c9ae521 DG	36	/*
	37	* Setup a lttng_event used to enable all syscall tracing.
	38	*/
	39	static void init_syscalls_kernel_event(struct lttng_event *event)
	40	{
	41	event->name[0] = '\0';
	42	/*
	43	* We use LTTNG_EVENT* here since the trace kernel creation will make the
	44	* right changes for the kernel.
	45	*/
	46	event->type = LTTNG_EVENT_SYSCALL;
	47	}
	48
54d01ffb	49	/*
7a3d1328	50	* Disable kernel tracepoint event for a channel from the kernel session.
54d01ffb	51	*/
7a3d1328	52	int event_kernel_disable_tracepoint(struct ltt_kernel_session *ksession,
54d01ffb DG	53	struct ltt_kernel_channel kchan, char event_name)
	54	{
	55	int ret;
	56	struct ltt_kernel_event *kevent;
	57
	58	kevent = trace_kernel_get_event_by_name(event_name, kchan);
	59	if (kevent == NULL) {
	60	ret = LTTCOMM_NO_EVENT;
	61	goto error;
	62	}
	63
	64	ret = kernel_disable_event(kevent);
	65	if (ret < 0) {
	66	ret = LTTCOMM_KERN_DISABLE_FAIL;
	67	goto error;
	68	}
	69
	70	DBG("Kernel event %s disable for channel %s.",
	71	kevent->event->name, kchan->channel->name);
	72
	73	ret = LTTCOMM_OK;
	74
	75	error:
	76	return ret;
	77	}
	78
	79	/*
7a3d1328	80	* Disable kernel tracepoint events for a channel from the kernel session.
54d01ffb	81	*/
7a3d1328	82	int event_kernel_disable_all_tracepoints(struct ltt_kernel_session *ksession,
54d01ffb DG	83	struct ltt_kernel_channel *kchan)
	84	{
	85	int ret;
	86	struct ltt_kernel_event *kevent;
	87
	88	/* For each event in the kernel session */
	89	cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
	90	ret = kernel_disable_event(kevent);
	91	if (ret < 0) {
	92	/* We continue disabling the rest */
	93	continue;
	94	}
	95	}
54d01ffb	96	ret = LTTCOMM_OK;
7a3d1328 MD	97	return ret;
	98	}
	99
	100	/*
	101	* Disable kernel syscall events for a channel from the kernel session.
	102	*/
	103	int event_kernel_disable_all_syscalls(struct ltt_kernel_session *ksession,
	104	struct ltt_kernel_channel *kchan)
	105	{
	106	ERR("Cannot disable syscall tracing for existing session. Please destroy session instead.");
	107	return LTTCOMM_OK; /* Return OK so disable all succeeds */
	108	}
54d01ffb	109
7a3d1328 MD	110	/*
	111	* Disable all kernel event for a channel from the kernel session.
	112	*/
	113	int event_kernel_disable_all(struct ltt_kernel_session *ksession,
	114	struct ltt_kernel_channel *kchan)
	115	{
	116	int ret;
	117
	118	ret = event_kernel_disable_all_tracepoints(ksession, kchan);
	119	if (ret != LTTCOMM_OK)
	120	return ret;
	121	ret = event_kernel_disable_all_syscalls(ksession, kchan);
54d01ffb DG	122	return ret;
	123	}
	124
	125	/*
7a3d1328	126	* Enable kernel tracepoint event for a channel from the kernel session.
54d01ffb	127	*/
7a3d1328	128	int event_kernel_enable_tracepoint(struct ltt_kernel_session *ksession,
54d01ffb DG	129	struct ltt_kernel_channel kchan, struct lttng_event event)
	130	{
	131	int ret;
	132	struct ltt_kernel_event *kevent;
	133
	134	kevent = trace_kernel_get_event_by_name(event->name, kchan);
	135	if (kevent == NULL) {
	136	ret = kernel_create_event(event, kchan);
	137	if (ret < 0) {
d87bfb32 DG	138	if (ret == -EEXIST) {
	139	ret = LTTCOMM_KERN_EVENT_EXIST;
	140	} else {
	141	ret = LTTCOMM_KERN_ENABLE_FAIL;
	142	}
7a3d1328	143	goto end;
54d01ffb DG	144	}
	145	} else if (kevent->enabled == 0) {
	146	ret = kernel_enable_event(kevent);
	147	if (ret < 0) {
	148	ret = LTTCOMM_KERN_ENABLE_FAIL;
7a3d1328	149	goto end;
54d01ffb DG	150	}
54d01ffb DG	151	}
54d01ffb	152	ret = LTTCOMM_OK;
7a3d1328	153	end:
54d01ffb DG	154	return ret;
	155	}
	156
	157	/*
7a3d1328	158	* Enable all kernel tracepoint events of a channel of the kernel session.
54d01ffb	159	*/
7a3d1328	160	int event_kernel_enable_all_tracepoints(struct ltt_kernel_session *ksession,
54d01ffb DG	161	struct ltt_kernel_channel *kchan, int kernel_tracer_fd)
	162	{
	163	int size, i, ret;
	164	struct ltt_kernel_event *kevent;
	165	struct lttng_event *event_list;
	166
	167	/* For each event in the kernel session */
	168	cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
	169	ret = kernel_enable_event(kevent);
	170	if (ret < 0) {
	171	/* Enable failed but still continue */
	172	continue;
	173	}
	174	}
	175
	176	size = kernel_list_events(kernel_tracer_fd, &event_list);
	177	if (size < 0) {
	178	ret = LTTCOMM_KERN_LIST_FAIL;
7a3d1328	179	goto end;
54d01ffb DG	180	}
	181
	182	for (i = 0; i < size; i++) {
	183	kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan);
	184	if (kevent == NULL) {
	185	/* Default event type for enable all */
	186	event_list[i].type = LTTNG_EVENT_TRACEPOINT;
	187	/* Enable each single tracepoint event */
	188	ret = kernel_create_event(&event_list[i], kchan);
	189	if (ret < 0) {
	190	/* Ignore error here and continue */
	191	}
	192	}
	193	}
54d01ffb	194	free(event_list);
54d01ffb	195	ret = LTTCOMM_OK;
7a3d1328	196	end:
54d01ffb	197	return ret;
7a3d1328	198
54d01ffb	199	}
8c9ae521 DG	200
8c9ae521 DG	201	/*
7a3d1328	202	* Enable all kernel tracepoint events of a channel of the kernel session.
8c9ae521	203	*/
7a3d1328	204	int event_kernel_enable_all_syscalls(struct ltt_kernel_session *ksession,
8c9ae521 DG	205	struct ltt_kernel_channel *kchan, int kernel_tracer_fd)
	206	{
	207	int ret;
	208	struct lttng_event event;
	209
	210	init_syscalls_kernel_event(&event);
	211
	212	DBG("Enabling all syscall tracing");
	213
	214	ret = kernel_create_event(&event, kchan);
	215	if (ret < 0) {
7a3d1328	216	goto end;
8c9ae521	217	}
8c9ae521	218	ret = LTTCOMM_OK;
7a3d1328 MD	219	end:
	220	return ret;
	221	}
8c9ae521	222
7a3d1328 MD	223	/*
	224	* Enable all kernel events of a channel of the kernel session.
	225	*/
	226	int event_kernel_enable_all(struct ltt_kernel_session *ksession,
	227	struct ltt_kernel_channel *kchan, int kernel_tracer_fd)
	228	{
	229	int ret;
	230
	231	ret = event_kernel_enable_all_tracepoints(ksession, kchan, kernel_tracer_fd);
	232	if (ret != LTTCOMM_OK) {
	233	goto end;
	234	}
	235	ret = event_kernel_enable_all_syscalls(ksession, kchan, kernel_tracer_fd);
	236	end:
8c9ae521 DG	237	return ret;
8c9ae521 DG	238	}
2bdd86d4 MD	239
	240	/*
	241	* Enable UST tracepoint event for a channel from a UST session.
	242	*/
	243	int event_ust_enable_tracepoint(struct ltt_ust_session *ustsession,
	244	struct ltt_ust_channel ustchan, struct lttng_event event)
	245	{
	246	int ret;
	247	struct ltt_ust_event *ustevent;
	248	struct lttng_ust_event lttngustevent;
	249	struct object_data *object_event;
	250
	251	ustevent = trace_ust_get_event_by_name(event->name, ustchan);
	252	if (ustevent == NULL) {
	253	ustevent = trace_ust_create_event(event);
	254	if (ustevent == NULL) {
	255	ret = -1;
	256	goto end;
	257	}
	258	strncpy(lttngustevent.name, event->name,
	259	LTTNG_UST_SYM_NAME_LEN);
	260	lttngustevent.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
	261	/* TODO: adjust to other instrumentation types */
	262	lttngustevent.instrumentation = LTTNG_UST_TRACEPOINT;
	263	ret = ustctl_create_event(ustsession->sock, &lttngustevent,
	264	ustchan->obj, &object_event);
	265	if (ret < 0) {
	266	if (ret == -EEXIST) {
	267	ret = LTTCOMM_KERN_EVENT_EXIST;
	268	} else {
	269	ret = LTTCOMM_KERN_ENABLE_FAIL;
	270	}
	271	goto end;
	272	}
	273	ustevent->obj = object_event;
	274	ustevent->handle = object_event->handle;
	275	ustevent->enabled = 1;
	276	/* Add event to event list */
	277	cds_list_add(&ustevent->list, &ustchan->events.head);
	278	ustchan->events.count++;
	279	} else if (ustevent->enabled == 0) {
	280	ret = ustctl_enable(ustsession->sock, ustevent->obj);
	281	if (ret < 0) {
	282	ret = LTTCOMM_KERN_ENABLE_FAIL;
	283	goto end;
	284	}
	285	ustevent->enabled = 1;
	286	}
	287	ret = LTTCOMM_OK;
	288	end:
	289	return ret;
	290	}
	291
	292	int event_ust_disable_tracepoint(struct ltt_ust_session *ustsession,
	293	struct ltt_ust_channel ustchan, char event_name)
	294	{
	295	int ret;
	296	struct ltt_ust_event *ustevent;
	297
	298	ustevent = trace_ust_get_event_by_name(event_name, ustchan);
	299	if (ustevent == NULL) {
	300	ret = LTTCOMM_NO_EVENT;
	301	goto end;
	302	}
303	ret = ustctl_disable(ustsession->sock, ustevent->obj);
304	if (ret < 0) {
305	ret = LTTCOMM_UST_ENABLE_FAIL;
306	goto end;
307	}
308	ustevent->enabled = 0;
309	ret = LTTCOMM_OK;
310	end:
311	return ret;
312	}