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

#define _GNU_SOURCE
#include <errno.h>
#include <urcu/list.h>
#include <string.h>

#include <lttng/lttng.h>
#include <common/error.h>
#include <common/sessiond-comm/sessiond-comm.h>

#include "channel.h"
#include "event.h"
#include "kernel.h"
#include "ust-ctl.h"
#include "ust-app.h"
#include "trace-kernel.h"
#include "trace-ust.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 = NULL;

	/* For each event in the kernel session */
	cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
		if (kevent->enabled == 0) {
			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) {
		if (ret == -EEXIST) {
			ret = LTTCOMM_KERN_EVENT_EXIST;
		} else {
			ret = LTTCOMM_KERN_ENABLE_FAIL;
		}
		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;
}

/*
 * ============================
 * UST : The Ultimate Frontier!
 * ============================
 */

/*
 * Enable all UST tracepoints for a channel from a UST session.
 */
int event_ust_enable_all_tracepoints(struct ltt_ust_session *usess, int domain,
		struct ltt_ust_channel *uchan)
{
	int ret, i;
	size_t size;
	struct lttng_ht_iter iter;
	struct ltt_ust_event *uevent = NULL;
	struct lttng_event *events = NULL;

	switch (domain) {
	case LTTNG_DOMAIN_UST:
	{
		/* Enable existing events */
		cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent,
				node.node) {
			if (uevent->enabled == 0) {
				ret = ust_app_enable_event_glb(usess, uchan, uevent);
				if (ret < 0) {
					continue;
				}
				uevent->enabled = 1;
			}
		}

		/* Get all UST available events */
		size = ust_app_list_events(&events);
		if (size < 0) {
			ret = LTTCOMM_UST_LIST_FAIL;
			goto error;
		}

		for (i = 0; i < size; i++) {
			/*
			 * Check if event exist and if so, continue since it was enable
			 * previously.
			 */
			uevent = trace_ust_find_event_by_name(uchan->events,
					events[i].name);
			if (uevent != NULL) {
				ret = ust_app_enable_event_pid(usess, uchan, uevent,
						events[i].pid);
				if (ret < 0) {
					if (ret != -EEXIST) {
						ret = LTTCOMM_UST_ENABLE_FAIL;
						goto error;
					}
				}
				continue;
			}

			/* Create ust event */
			uevent = trace_ust_create_event(&events[i]);
			if (uevent == NULL) {
				ret = LTTCOMM_FATAL;
				goto error_destroy;
			}

			/* Create event for the specific PID */
			ret = ust_app_enable_event_pid(usess, uchan, uevent,
					events[i].pid);
			if (ret < 0) {
				if (ret == -EEXIST) {
					ret = LTTCOMM_UST_EVENT_EXIST;
					goto error;
				} else {
					ret = LTTCOMM_UST_ENABLE_FAIL;
					goto error_destroy;
				}
			}

			uevent->enabled = 1;
			/* Add ltt ust event to channel */
			rcu_read_lock();
			lttng_ht_add_unique_str(uchan->events, &uevent->node);
			rcu_read_unlock();
		}

		free(events);
		break;
	}
	case LTTNG_DOMAIN_UST_EXEC_NAME:
	case LTTNG_DOMAIN_UST_PID:
	case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
	default:
		ret = LTTCOMM_NOT_IMPLEMENTED;
		goto error;
	}

	return LTTCOMM_OK;

error_destroy:
	trace_ust_destroy_event(uevent);

error:
	free(events);
	return ret;
}

/*
 * Enable UST tracepoint event for a channel from a UST session.
 */
int event_ust_enable_tracepoint(struct ltt_ust_session *usess, int domain,
		struct ltt_ust_channel *uchan, struct lttng_event *event)
{
	int ret = LTTCOMM_OK, to_create = 0;
	struct ltt_ust_event *uevent;

	uevent = trace_ust_find_event_by_name(uchan->events, event->name);
	if (uevent == NULL) {
		uevent = trace_ust_create_event(event);
		if (uevent == NULL) {
			ret = LTTCOMM_FATAL;
			goto error;
		}
		/* Valid to set it after the goto error since uevent is still NULL */
		to_create = 1;
	}

	if (uevent->enabled) {
		/* It's already enabled so everything is OK */
		goto end;
	}

	uevent->enabled = 1;

	switch (domain) {
	case LTTNG_DOMAIN_UST:
	{
		if (to_create) {
			/* Create event on all UST registered apps for session */
			ret = ust_app_create_event_glb(usess, uchan, uevent);
		} else {
			/* Enable event on all UST registered apps for session */
			ret = ust_app_enable_event_glb(usess, uchan, uevent);
		}

		if (ret < 0) {
			if (ret == -EEXIST) {
				ret = LTTCOMM_UST_EVENT_EXIST;
				goto end;
			} else {
				ret = LTTCOMM_UST_ENABLE_FAIL;
				goto error;
			}
		}
		break;
	}
	case LTTNG_DOMAIN_UST_EXEC_NAME:
	case LTTNG_DOMAIN_UST_PID:
	case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
	default:
		ret = LTTCOMM_NOT_IMPLEMENTED;
		goto end;
	}

	if (to_create) {
		rcu_read_lock();
		/* Add ltt ust event to channel */
		lttng_ht_add_unique_str(uchan->events, &uevent->node);
		rcu_read_unlock();
	}

	DBG("Event UST %s %s in channel %s", uevent->attr.name,
			to_create ? "created" : "enabled", uchan->name);

	ret = LTTCOMM_OK;

end:
	return ret;

error:
	/*
	 * Only destroy event on creation time (not enabling time) because if the
	 * event is found in the channel (to_create == 0), it means that at some
	 * point the enable_event worked and it's thus valid to keep it alive.
	 * Destroying it also implies that we also destroy it's shadow copy to sync
	 * everyone up.
	 */
	if (to_create) {
		/* In this code path, the uevent was not added to the hash table */
		trace_ust_destroy_event(uevent);
	}
	return ret;
}

/*
 * Disable UST tracepoint of a channel from a UST session.
 */
int event_ust_disable_tracepoint(struct ltt_ust_session *usess, int domain,
		struct ltt_ust_channel *uchan, char *event_name)
{
	int ret;
	struct ltt_ust_event *uevent;

	uevent = trace_ust_find_event_by_name(uchan->events, event_name);
	if (uevent == NULL) {
		ret = LTTCOMM_UST_EVENT_NOT_FOUND;
		goto error;
	}

	if (uevent->enabled == 0) {
		/* It's already enabled so everything is OK */
		ret = LTTCOMM_OK;
		goto end;
	}

	switch (domain) {
	case LTTNG_DOMAIN_UST:
		ret = ust_app_disable_event_glb(usess, uchan, uevent);
		if (ret < 0 && ret != -EEXIST) {
			ret = LTTCOMM_UST_DISABLE_FAIL;
			goto error;
		}
		break;
	case LTTNG_DOMAIN_UST_EXEC_NAME:
	case LTTNG_DOMAIN_UST_PID:
	case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
	default:
		ret = LTTCOMM_NOT_IMPLEMENTED;
		goto error;
	}

	uevent->enabled = 0;
	ret = LTTCOMM_OK;

end:
	DBG2("Event UST %s disabled in channel %s", uevent->attr.name,
			uchan->name);

error:
	return ret;
}

/*
 * Disable all UST tracepoints for a channel from a UST session.
 */
int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess, int domain,
		struct ltt_ust_channel *uchan)
{
	int ret, i;
	size_t size;
	struct lttng_ht_iter iter;
	struct ltt_ust_event *uevent = NULL;
	struct lttng_event *events = NULL;

	switch (domain) {
	case LTTNG_DOMAIN_UST:
	{
		/* Disabling existing events */
		cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent,
				node.node) {
			if (uevent->enabled == 1) {
				ret = ust_app_disable_event_glb(usess, uchan, uevent);
				if (ret < 0) {
					continue;
				}
				uevent->enabled = 0;
			}
		}

		/* Get all UST available events */
		size = ust_app_list_events(&events);
		if (size < 0) {
			ret = LTTCOMM_UST_LIST_FAIL;
			goto error;
		}

		for (i = 0; i < size; i++) {
			uevent = trace_ust_find_event_by_name(uchan->events,
					events[i].name);
			if (uevent != NULL && uevent->enabled == 1) {
				ret = ust_app_disable_event_pid(usess, uchan, uevent,
						events[i].pid);
				if (ret < 0 && ret != -EEXIST) {
					ret = LTTCOMM_UST_DISABLE_FAIL;
					goto error;
				}
				uevent->enabled = 0;
				continue;
			}
		}

		free(events);
		break;
	}
	case LTTNG_DOMAIN_UST_EXEC_NAME:
	case LTTNG_DOMAIN_UST_PID:
	case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
	default:
		ret = LTTCOMM_NOT_IMPLEMENTED;
		goto error;
	}

	return LTTCOMM_OK;

error:
	free(events);
	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
be040666	18	#define _GNU_SOURCE
d87bfb32	19	#include <errno.h>
54d01ffb	20	#include <urcu/list.h>
2bdd86d4	21	#include <string.h>
54d01ffb DG	22
54d01ffb DG	23	#include <lttng/lttng.h>
db758600	24	#include <common/error.h>
10a8a223	25	#include <common/sessiond-comm/sessiond-comm.h>
54d01ffb DG	26
	27	#include "channel.h"
	28	#include "event.h"
4771f025	29	#include "kernel.h"
9df8df5e	30	#include "ust-ctl.h"
edb67388 DG	31	#include "ust-app.h"
	32	#include "trace-kernel.h"
	33	#include "trace-ust.h"
54d01ffb	34
8c9ae521 DG	35	/*
	36	* Setup a lttng_event used to enable all syscall tracing.
	37	*/
	38	static void init_syscalls_kernel_event(struct lttng_event *event)
	39	{
	40	event->name[0] = '\0';
	41	/*
	42	* We use LTTNG_EVENT* here since the trace kernel creation will make the
	43	* right changes for the kernel.
	44	*/
	45	event->type = LTTNG_EVENT_SYSCALL;
	46	}
	47
54d01ffb	48	/*
7a3d1328	49	* Disable kernel tracepoint event for a channel from the kernel session.
54d01ffb	50	*/
7a3d1328	51	int event_kernel_disable_tracepoint(struct ltt_kernel_session *ksession,
54d01ffb DG	52	struct ltt_kernel_channel kchan, char event_name)
	53	{
	54	int ret;
	55	struct ltt_kernel_event *kevent;
	56
	57	kevent = trace_kernel_get_event_by_name(event_name, kchan);
	58	if (kevent == NULL) {
	59	ret = LTTCOMM_NO_EVENT;
	60	goto error;
	61	}
	62
	63	ret = kernel_disable_event(kevent);
	64	if (ret < 0) {
	65	ret = LTTCOMM_KERN_DISABLE_FAIL;
	66	goto error;
	67	}
	68
	69	DBG("Kernel event %s disable for channel %s.",
	70	kevent->event->name, kchan->channel->name);
	71
	72	ret = LTTCOMM_OK;
	73
	74	error:
	75	return ret;
	76	}
	77
	78	/*
7a3d1328	79	* Disable kernel tracepoint events for a channel from the kernel session.
54d01ffb	80	*/
7a3d1328	81	int event_kernel_disable_all_tracepoints(struct ltt_kernel_session *ksession,
54d01ffb DG	82	struct ltt_kernel_channel *kchan)
	83	{
	84	int ret;
	85	struct ltt_kernel_event *kevent;
	86
	87	/* For each event in the kernel session */
	88	cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
	89	ret = kernel_disable_event(kevent);
	90	if (ret < 0) {
	91	/* We continue disabling the rest */
	92	continue;
	93	}
	94	}
54d01ffb	95	ret = LTTCOMM_OK;
7a3d1328 MD	96	return ret;
	97	}
	98
	99	/*
	100	* Disable kernel syscall events for a channel from the kernel session.
	101	*/
	102	int event_kernel_disable_all_syscalls(struct ltt_kernel_session *ksession,
	103	struct ltt_kernel_channel *kchan)
	104	{
	105	ERR("Cannot disable syscall tracing for existing session. Please destroy session instead.");
	106	return LTTCOMM_OK; /* Return OK so disable all succeeds */
	107	}
54d01ffb	108
7a3d1328 MD	109	/*
	110	* Disable all kernel event for a channel from the kernel session.
	111	*/
	112	int event_kernel_disable_all(struct ltt_kernel_session *ksession,
	113	struct ltt_kernel_channel *kchan)
	114	{
	115	int ret;
	116
	117	ret = event_kernel_disable_all_tracepoints(ksession, kchan);
	118	if (ret != LTTCOMM_OK)
	119	return ret;
	120	ret = event_kernel_disable_all_syscalls(ksession, kchan);
54d01ffb DG	121	return ret;
	122	}
	123
	124	/*
7a3d1328	125	* Enable kernel tracepoint event for a channel from the kernel session.
54d01ffb	126	*/
7a3d1328	127	int event_kernel_enable_tracepoint(struct ltt_kernel_session *ksession,
54d01ffb DG	128	struct ltt_kernel_channel kchan, struct lttng_event event)
	129	{
	130	int ret;
	131	struct ltt_kernel_event *kevent;
	132
	133	kevent = trace_kernel_get_event_by_name(event->name, kchan);
	134	if (kevent == NULL) {
	135	ret = kernel_create_event(event, kchan);
	136	if (ret < 0) {
d87bfb32 DG	137	if (ret == -EEXIST) {
	138	ret = LTTCOMM_KERN_EVENT_EXIST;
	139	} else {
	140	ret = LTTCOMM_KERN_ENABLE_FAIL;
	141	}
7a3d1328	142	goto end;
54d01ffb DG	143	}
	144	} else if (kevent->enabled == 0) {
	145	ret = kernel_enable_event(kevent);
	146	if (ret < 0) {
	147	ret = LTTCOMM_KERN_ENABLE_FAIL;
7a3d1328	148	goto end;
54d01ffb DG	149	}
54d01ffb DG	150	}
54d01ffb	151	ret = LTTCOMM_OK;
7a3d1328	152	end:
54d01ffb DG	153	return ret;
	154	}
	155
	156	/*
7a3d1328	157	* Enable all kernel tracepoint events of a channel of the kernel session.
54d01ffb	158	*/
7a3d1328	159	int event_kernel_enable_all_tracepoints(struct ltt_kernel_session *ksession,
54d01ffb DG	160	struct ltt_kernel_channel *kchan, int kernel_tracer_fd)
	161	{
	162	int size, i, ret;
	163	struct ltt_kernel_event *kevent;
8f69e5eb	164	struct lttng_event *event_list = NULL;
54d01ffb DG	165
	166	/* For each event in the kernel session */
	167	cds_list_for_each_entry(kevent, &kchan->events_list.head, list) {
8f69e5eb DG	168	if (kevent->enabled == 0) {
	169	ret = kernel_enable_event(kevent);
	170	if (ret < 0) {
	171	/* Enable failed but still continue */
	172	continue;
	173	}
54d01ffb DG	174	}
	175	}
	176
	177	size = kernel_list_events(kernel_tracer_fd, &event_list);
	178	if (size < 0) {
	179	ret = LTTCOMM_KERN_LIST_FAIL;
7a3d1328	180	goto end;
54d01ffb DG	181	}
	182
	183	for (i = 0; i < size; i++) {
	184	kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan);
	185	if (kevent == NULL) {
	186	/* Default event type for enable all */
	187	event_list[i].type = LTTNG_EVENT_TRACEPOINT;
	188	/* Enable each single tracepoint event */
	189	ret = kernel_create_event(&event_list[i], kchan);
	190	if (ret < 0) {
	191	/* Ignore error here and continue */
	192	}
	193	}
	194	}
54d01ffb	195	free(event_list);
8f69e5eb	196
54d01ffb	197	ret = LTTCOMM_OK;
7a3d1328	198	end:
54d01ffb	199	return ret;
7a3d1328	200
54d01ffb	201	}
8c9ae521 DG	202
8c9ae521 DG	203	/*
7a3d1328	204	* Enable all kernel tracepoint events of a channel of the kernel session.
8c9ae521	205	*/
7a3d1328	206	int event_kernel_enable_all_syscalls(struct ltt_kernel_session *ksession,
8c9ae521 DG	207	struct ltt_kernel_channel *kchan, int kernel_tracer_fd)
	208	{
	209	int ret;
	210	struct lttng_event event;
	211
	212	init_syscalls_kernel_event(&event);
	213
	214	DBG("Enabling all syscall tracing");
	215
	216	ret = kernel_create_event(&event, kchan);
	217	if (ret < 0) {
8f69e5eb DG	218	if (ret == -EEXIST) {
	219	ret = LTTCOMM_KERN_EVENT_EXIST;
	220	} else {
	221	ret = LTTCOMM_KERN_ENABLE_FAIL;
	222	}
7a3d1328	223	goto end;
8c9ae521	224	}
8f69e5eb	225
8c9ae521	226	ret = LTTCOMM_OK;
7a3d1328 MD	227	end:
	228	return ret;
	229	}
8c9ae521	230
7a3d1328 MD	231	/*
	232	* Enable all kernel events of a channel of the kernel session.
	233	*/
	234	int event_kernel_enable_all(struct ltt_kernel_session *ksession,
	235	struct ltt_kernel_channel *kchan, int kernel_tracer_fd)
	236	{
	237	int ret;
	238
	239	ret = event_kernel_enable_all_tracepoints(ksession, kchan, kernel_tracer_fd);
	240	if (ret != LTTCOMM_OK) {
	241	goto end;
	242	}
	243	ret = event_kernel_enable_all_syscalls(ksession, kchan, kernel_tracer_fd);
	244	end:
8c9ae521 DG	245	return ret;
8c9ae521 DG	246	}
2bdd86d4	247
7f79d3a1 DG	248	/*
	249	* ============================
	250	* UST : The Ultimate Frontier!
	251	* ============================
	252	*/
	253
76d45b40 DG	254	/*
	255	* Enable all UST tracepoints for a channel from a UST session.
	256	*/
	257	int event_ust_enable_all_tracepoints(struct ltt_ust_session *usess, int domain,
	258	struct ltt_ust_channel *uchan)
	259	{
	260	int ret, i;
	261	size_t size;
bec39940	262	struct lttng_ht_iter iter;
76d45b40	263	struct ltt_ust_event *uevent = NULL;
7f79d3a1	264	struct lttng_event *events = NULL;
76d45b40 DG	265
	266	switch (domain) {
	267	case LTTNG_DOMAIN_UST:
	268	{
	269	/* Enable existing events */
bec39940 DG	270	cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent,
bec39940 DG	271	node.node) {
76d45b40 DG	272	if (uevent->enabled == 0) {
	273	ret = ust_app_enable_event_glb(usess, uchan, uevent);
	274	if (ret < 0) {
	275	continue;
	276	}
	277	uevent->enabled = 1;
	278	}
	279	}
	280
	281	/* Get all UST available events */
	282	size = ust_app_list_events(&events);
	283	if (size < 0) {
	284	ret = LTTCOMM_UST_LIST_FAIL;
	285	goto error;
	286	}
	287
	288	for (i = 0; i < size; i++) {
	289	/*
	290	* Check if event exist and if so, continue since it was enable
	291	* previously.
	292	*/
	293	uevent = trace_ust_find_event_by_name(uchan->events,
	294	events[i].name);
	295	if (uevent != NULL) {
	296	ret = ust_app_enable_event_pid(usess, uchan, uevent,
	297	events[i].pid);
	298	if (ret < 0) {
	299	if (ret != -EEXIST) {
	300	ret = LTTCOMM_UST_ENABLE_FAIL;
	301	goto error;
	302	}
	303	}
	304	continue;
	305	}
	306
	307	/* Create ust event */
	308	uevent = trace_ust_create_event(&events[i]);
	309	if (uevent == NULL) {
	310	ret = LTTCOMM_FATAL;
7f79d3a1	311	goto error_destroy;
76d45b40 DG	312	}
	313
	314	/* Create event for the specific PID */
	315	ret = ust_app_enable_event_pid(usess, uchan, uevent,
	316	events[i].pid);
	317	if (ret < 0) {
	318	if (ret == -EEXIST) {
	319	ret = LTTCOMM_UST_EVENT_EXIST;
7f79d3a1	320	goto error;
76d45b40 DG	321	} else {
76d45b40 DG	322	ret = LTTCOMM_UST_ENABLE_FAIL;
7f79d3a1	323	goto error_destroy;
76d45b40	324	}
76d45b40 DG	325	}
	326
	327	uevent->enabled = 1;
	328	/* Add ltt ust event to channel */
	329	rcu_read_lock();
bec39940	330	lttng_ht_add_unique_str(uchan->events, &uevent->node);
76d45b40 DG	331	rcu_read_unlock();
	332	}
	333
	334	free(events);
	335	break;
	336	}
	337	case LTTNG_DOMAIN_UST_EXEC_NAME:
	338	case LTTNG_DOMAIN_UST_PID:
	339	case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
	340	default:
	341	ret = LTTCOMM_NOT_IMPLEMENTED;
	342	goto error;
	343	}
	344
	345	return LTTCOMM_OK;
	346
7f79d3a1	347	error_destroy:
76d45b40	348	trace_ust_destroy_event(uevent);
7f79d3a1 DG	349
	350	error:
	351	free(events);
76d45b40 DG	352	return ret;
	353	}
	354
2bdd86d4 MD	355	/*
	356	* Enable UST tracepoint event for a channel from a UST session.
	357	*/
edb67388 DG	358	int event_ust_enable_tracepoint(struct ltt_ust_session *usess, int domain,
edb67388 DG	359	struct ltt_ust_channel uchan, struct lttng_event event)
2bdd86d4	360	{
fc34caaa	361	int ret = LTTCOMM_OK, to_create = 0;
edb67388 DG	362	struct ltt_ust_event *uevent;
	363
	364	uevent = trace_ust_find_event_by_name(uchan->events, event->name);
	365	if (uevent == NULL) {
	366	uevent = trace_ust_create_event(event);
	367	if (uevent == NULL) {
	368	ret = LTTCOMM_FATAL;
	369	goto error;
	370	}
fc34caaa	371	/* Valid to set it after the goto error since uevent is still NULL */
edb67388 DG	372	to_create = 1;
edb67388 DG	373	}
2bdd86d4	374
7f79d3a1 DG	375	if (uevent->enabled) {
7f79d3a1 DG	376	/* It's already enabled so everything is OK */
7f79d3a1 DG	377	goto end;
	378	}
	379
fc34caaa DG	380	uevent->enabled = 1;
fc34caaa DG	381
edb67388 DG	382	switch (domain) {
	383	case LTTNG_DOMAIN_UST:
	384	{
	385	if (to_create) {
	386	/* Create event on all UST registered apps for session */
35a9059d	387	ret = ust_app_create_event_glb(usess, uchan, uevent);
edb67388 DG	388	} else {
edb67388 DG	389	/* Enable event on all UST registered apps for session */
35a9059d	390	ret = ust_app_enable_event_glb(usess, uchan, uevent);
edb67388	391	}
48842b30	392
edb67388 DG	393	if (ret < 0) {
	394	if (ret == -EEXIST) {
	395	ret = LTTCOMM_UST_EVENT_EXIST;
7f79d3a1	396	goto end;
edb67388 DG	397	} else {
edb67388 DG	398	ret = LTTCOMM_UST_ENABLE_FAIL;
7f79d3a1	399	goto error;
edb67388	400	}
edb67388	401	}
edb67388 DG	402	break;
	403	}
	404	case LTTNG_DOMAIN_UST_EXEC_NAME:
	405	case LTTNG_DOMAIN_UST_PID:
	406	case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
	407	default:
	408	ret = LTTCOMM_NOT_IMPLEMENTED;
7f79d3a1	409	goto end;
2bdd86d4	410	}
48842b30	411
7f79d3a1 DG	412	if (to_create) {
7f79d3a1 DG	413	rcu_read_lock();
fc34caaa	414	/* Add ltt ust event to channel */
bec39940	415	lttng_ht_add_unique_str(uchan->events, &uevent->node);
7f79d3a1 DG	416	rcu_read_unlock();
7f79d3a1 DG	417	}
edb67388	418
7f79d3a1 DG	419	DBG("Event UST %s %s in channel %s", uevent->attr.name,
	420	to_create ? "created" : "enabled", uchan->name);
	421
fc34caaa DG	422	ret = LTTCOMM_OK;
fc34caaa DG	423
fb89d070	424	end:
fc34caaa	425	return ret;
edb67388 DG	426
edb67388 DG	427	error:
fc34caaa DG	428	/*
	429	* Only destroy event on creation time (not enabling time) because if the
	430	* event is found in the channel (to_create == 0), it means that at some
	431	* point the enable_event worked and it's thus valid to keep it alive.
	432	* Destroying it also implies that we also destroy it's shadow copy to sync
	433	* everyone up.
	434	*/
	435	if (to_create) {
	436	/* In this code path, the uevent was not added to the hash table */
	437	trace_ust_destroy_event(uevent);
	438	}
2bdd86d4 MD	439	return ret;
	440	}
	441
7f79d3a1 DG	442	/*
	443	* Disable UST tracepoint of a channel from a UST session.
	444	*/
	445	int event_ust_disable_tracepoint(struct ltt_ust_session *usess, int domain,
	446	struct ltt_ust_channel uchan, char event_name)
2bdd86d4 MD	447	{
2bdd86d4 MD	448	int ret;
7f79d3a1	449	struct ltt_ust_event *uevent;
2bdd86d4	450
7f79d3a1 DG	451	uevent = trace_ust_find_event_by_name(uchan->events, event_name);
	452	if (uevent == NULL) {
	453	ret = LTTCOMM_UST_EVENT_NOT_FOUND;
	454	goto error;
2bdd86d4	455	}
7f79d3a1 DG	456
	457	if (uevent->enabled == 0) {
	458	/* It's already enabled so everything is OK */
	459	ret = LTTCOMM_OK;
2bdd86d4 MD	460	goto end;
2bdd86d4 MD	461	}
7f79d3a1 DG	462
	463	switch (domain) {
	464	case LTTNG_DOMAIN_UST:
	465	ret = ust_app_disable_event_glb(usess, uchan, uevent);
	466	if (ret < 0 && ret != -EEXIST) {
	467	ret = LTTCOMM_UST_DISABLE_FAIL;
	468	goto error;
	469	}
	470	break;
	471	case LTTNG_DOMAIN_UST_EXEC_NAME:
	472	case LTTNG_DOMAIN_UST_PID:
	473	case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
	474	default:
	475	ret = LTTCOMM_NOT_IMPLEMENTED;
	476	goto error;
	477	}
	478
	479	uevent->enabled = 0;
2bdd86d4	480	ret = LTTCOMM_OK;
7f79d3a1	481
2bdd86d4	482	end:
7f79d3a1 DG	483	DBG2("Event UST %s disabled in channel %s", uevent->attr.name,
	484	uchan->name);
	485
	486	error:
	487	return ret;
	488	}
	489
	490	/*
	491	* Disable all UST tracepoints for a channel from a UST session.
	492	*/
	493	int event_ust_disable_all_tracepoints(struct ltt_ust_session *usess, int domain,
	494	struct ltt_ust_channel *uchan)
	495	{
	496	int ret, i;
	497	size_t size;
bec39940	498	struct lttng_ht_iter iter;
7f79d3a1 DG	499	struct ltt_ust_event *uevent = NULL;
	500	struct lttng_event *events = NULL;
	501
	502	switch (domain) {
	503	case LTTNG_DOMAIN_UST:
	504	{
	505	/* Disabling existing events */
bec39940 DG	506	cds_lfht_for_each_entry(uchan->events->ht, &iter.iter, uevent,
bec39940 DG	507	node.node) {
7f79d3a1 DG	508	if (uevent->enabled == 1) {
	509	ret = ust_app_disable_event_glb(usess, uchan, uevent);
	510	if (ret < 0) {
	511	continue;
	512	}
	513	uevent->enabled = 0;
	514	}
	515	}
	516
	517	/* Get all UST available events */
	518	size = ust_app_list_events(&events);
	519	if (size < 0) {
	520	ret = LTTCOMM_UST_LIST_FAIL;
	521	goto error;
	522	}
	523
	524	for (i = 0; i < size; i++) {
	525	uevent = trace_ust_find_event_by_name(uchan->events,
	526	events[i].name);
	527	if (uevent != NULL && uevent->enabled == 1) {
	528	ret = ust_app_disable_event_pid(usess, uchan, uevent,
	529	events[i].pid);
	530	if (ret < 0 && ret != -EEXIST) {
	531	ret = LTTCOMM_UST_DISABLE_FAIL;
	532	goto error;
	533	}
	534	uevent->enabled = 0;
	535	continue;
	536	}
	537	}
	538
	539	free(events);
	540	break;
	541	}
	542	case LTTNG_DOMAIN_UST_EXEC_NAME:
	543	case LTTNG_DOMAIN_UST_PID:
	544	case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN:
	545	default:
	546	ret = LTTCOMM_NOT_IMPLEMENTED;
	547	goto error;
	548	}
	549
	550	return LTTCOMM_OK;
	551
	552	error:
	553	free(events);
2bdd86d4 MD	554	return ret;
2bdd86d4 MD	555	}