/*
* lttng-ust-abi.c
*
* LTTng UST ABI
*
* Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; only
* version 2.1 of the License.
*
* This library 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
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
*
* Mimic system calls for:
* - session creation, returns an object descriptor or failure.
* - channel creation, returns an object descriptor or failure.
* - Operates on a session object descriptor
* - Takes all channel options as parameters.
* - stream get, returns an object descriptor or failure.
* - Operates on a channel object descriptor.
* - stream notifier get, returns an object descriptor or failure.
* - Operates on a channel object descriptor.
* - event creation, returns an object descriptor or failure.
* - Operates on a channel object descriptor
* - Takes an event name as parameter
* - Takes an instrumentation source as parameter
* - e.g. tracepoints, dynamic_probes...
* - Takes instrumentation source specific arguments.
*/
#include <lttng/ust-abi.h>
#include <lttng/ust-error.h>
#include <urcu/compiler.h>
#include <urcu/list.h>
#include <lttng/ust-events.h>
#include <lttng/ust-version.h>
#include <lttng/tracepoint.h>
#include "tracepoint-internal.h"
#include <usterr-signal-safe.h>
#include <helper.h>
#include "lttng-tracer.h"
#include "../libringbuffer/shm.h"
#include "../libringbuffer/frontend_types.h"
#define OBJ_NAME_LEN 16
static int lttng_ust_abi_close_in_progress;
static
int lttng_abi_tracepoint_list(void *owner);
static
int lttng_abi_tracepoint_field_list(void *owner);
/*
* Object descriptor table. Should be protected from concurrent access
* by the caller.
*/
struct lttng_ust_obj {
union {
struct {
void *private_data;
const struct lttng_ust_objd_ops *ops;
int f_count;
int owner_ref; /* has ref from owner */
void *owner;
char name[OBJ_NAME_LEN];
} s;
int freelist_next; /* offset freelist. end is -1. */
} u;
};
struct lttng_ust_objd_table {
struct lttng_ust_obj *array;
unsigned int len, allocated_len;
int freelist_head; /* offset freelist head. end is -1 */
};
static struct lttng_ust_objd_table objd_table = {
.freelist_head = -1,
};
static
int objd_alloc(void *private_data, const struct lttng_ust_objd_ops *ops,
void *owner, const char *name)
{
struct lttng_ust_obj *obj;
if (objd_table.freelist_head != -1) {
obj = &objd_table.array[objd_table.freelist_head];
objd_table.freelist_head = obj->u.freelist_next;
goto end;
}
if (objd_table.len >= objd_table.allocated_len) {
unsigned int new_allocated_len, old_allocated_len;
struct lttng_ust_obj *new_table, *old_table;
old_allocated_len = objd_table.allocated_len;
old_table = objd_table.array;
if (!old_allocated_len)
new_allocated_len = 1;
else
new_allocated_len = old_allocated_len << 1;
new_table = zmalloc(sizeof(struct lttng_ust_obj) * new_allocated_len);
if (!new_table)
return -ENOMEM;
memcpy(new_table, old_table,
sizeof(struct lttng_ust_obj) * old_allocated_len);
free(old_table);
objd_table.array = new_table;
objd_table.allocated_len = new_allocated_len;
}
obj = &objd_table.array[objd_table.len];
objd_table.len++;
end:
obj->u.s.private_data = private_data;
obj->u.s.ops = ops;
obj->u.s.f_count = 2; /* count == 1 : object is allocated */
/* count == 2 : allocated + hold ref */
obj->u.s.owner_ref = 1; /* One owner reference */
obj->u.s.owner = owner;
strncpy(obj->u.s.name, name, OBJ_NAME_LEN);
obj->u.s.name[OBJ_NAME_LEN - 1] = '\0';
return obj - objd_table.array;
}
static
struct lttng_ust_obj *_objd_get(int id)
{
if (id >= objd_table.len)
return NULL;
if (!objd_table.array[id].u.s.f_count)
return NULL;
return &objd_table.array[id];
}
static
void *objd_private(int id)
{
struct lttng_ust_obj *obj = _objd_get(id);
assert(obj);
return obj->u.s.private_data;
}
static
void objd_set_private(int id, void *private_data)
{
struct lttng_ust_obj *obj = _objd_get(id);
assert(obj);
obj->u.s.private_data = private_data;
}
const struct lttng_ust_objd_ops *objd_ops(int id)
{
struct lttng_ust_obj *obj = _objd_get(id);
if (!obj)
return NULL;
return obj->u.s.ops;
}
static
void objd_free(int id)
{
struct lttng_ust_obj *obj = _objd_get(id);
assert(obj);
obj->u.freelist_next = objd_table.freelist_head;
objd_table.freelist_head = obj - objd_table.array;
assert(obj->u.s.f_count == 1);
obj->u.s.f_count = 0; /* deallocated */
}
static
void objd_ref(int id)
{
struct lttng_ust_obj *obj = _objd_get(id);
assert(obj != NULL);
obj->u.s.f_count++;
}
int lttng_ust_objd_unref(int id, int is_owner)
{
struct lttng_ust_obj *obj = _objd_get(id);
if (!obj)
return -EINVAL;
if (obj->u.s.f_count == 1) {
ERR("Reference counting error\n");
return -EINVAL;
}
if (is_owner) {
if (!obj->u.s.owner_ref) {
ERR("Error decrementing owner reference");
return -EINVAL;
}
obj->u.s.owner_ref--;
}
if ((--obj->u.s.f_count) == 1) {
const struct lttng_ust_objd_ops *ops = objd_ops(id);
if (ops->release)
ops->release(id);
objd_free(id);
}
return 0;
}
static
void objd_table_destroy(void)
{
int i;
for (i = 0; i < objd_table.allocated_len; i++) {
struct lttng_ust_obj *obj;
obj = _objd_get(i);
if (!obj)
continue;
if (!obj->u.s.owner_ref)
continue; /* only unref owner ref. */
(void) lttng_ust_objd_unref(i, 1);
}
free(objd_table.array);
objd_table.array = NULL;
objd_table.len = 0;
objd_table.allocated_len = 0;
objd_table.freelist_head = -1;
}
const char *lttng_ust_obj_get_name(int id)
{
struct lttng_ust_obj *obj = _objd_get(id);
if (!obj)
return NULL;
return obj->u.s.name;
}
void lttng_ust_objd_table_owner_cleanup(void *owner)
{
int i;
for (i = 0; i < objd_table.allocated_len; i++) {
struct lttng_ust_obj *obj;
obj = _objd_get(i);
if (!obj)
continue;
if (!obj->u.s.owner)
continue; /* skip root handles */
if (!obj->u.s.owner_ref)
continue; /* only unref owner ref. */
if (obj->u.s.owner == owner)
(void) lttng_ust_objd_unref(i, 1);
}
}
/*
* This is LTTng's own personal way to create an ABI for sessiond.
* We send commands over a socket.
*/
static const struct lttng_ust_objd_ops lttng_ops;
static const struct lttng_ust_objd_ops lttng_session_ops;
static const struct lttng_ust_objd_ops lttng_channel_ops;
static const struct lttng_ust_objd_ops lttng_enabler_ops;
static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops;
static const struct lttng_ust_objd_ops lttng_tracepoint_field_list_ops;
int lttng_abi_create_root_handle(void)
{
int root_handle;
/* root handles have NULL owners */
root_handle = objd_alloc(NULL, <tng_ops, NULL, "root");
return root_handle;
}
static
int lttng_is_channel_ready(struct lttng_channel *lttng_chan)
{
struct channel *chan;
unsigned int nr_streams, exp_streams;
chan = lttng_chan->chan;
nr_streams = channel_handle_get_nr_streams(lttng_chan->handle);
exp_streams = chan->nr_streams;
return nr_streams == exp_streams;
}
static
int lttng_abi_create_session(void *owner)
{
struct lttng_session *session;
int session_objd, ret;
session = lttng_session_create();
if (!session)
return -ENOMEM;
session_objd = objd_alloc(session, <tng_session_ops, owner, "session");
if (session_objd < 0) {
ret = session_objd;
goto objd_error;
}
session->objd = session_objd;
session->owner = owner;
return session_objd;
objd_error:
lttng_session_destroy(session);
return ret;
}
static
long lttng_abi_tracer_version(int objd,
struct lttng_ust_tracer_version *v)
{
v->major = LTTNG_UST_MAJOR_VERSION;
v->minor = LTTNG_UST_MINOR_VERSION;
v->patchlevel = LTTNG_UST_PATCHLEVEL_VERSION;
return 0;
}
static
long lttng_abi_add_context(int objd,
struct lttng_ust_context *context_param,
union ust_args *uargs,
struct lttng_ctx **ctx, struct lttng_session *session)
{
return lttng_attach_context(context_param, uargs, ctx, session);
}
/**
* lttng_cmd - lttng control through socket commands
*
* @objd: the object descriptor
* @cmd: the command
* @arg: command arg
* @uargs: UST arguments (internal)
* @owner: objd owner
*
* This descriptor implements lttng commands:
* LTTNG_UST_SESSION
* Returns a LTTng trace session object descriptor
* LTTNG_UST_TRACER_VERSION
* Returns the LTTng kernel tracer version
* LTTNG_UST_TRACEPOINT_LIST
* Returns a file descriptor listing available tracepoints
* LTTNG_UST_TRACEPOINT_FIELD_LIST
* Returns a file descriptor listing available tracepoint fields
* LTTNG_UST_WAIT_QUIESCENT
* Returns after all previously running probes have completed
*
* The returned session will be deleted when its file descriptor is closed.
*/
static
long lttng_cmd(int objd, unsigned int cmd, unsigned long arg,
union ust_args *uargs, void *owner)
{
switch (cmd) {
case LTTNG_UST_SESSION:
return lttng_abi_create_session(owner);
case LTTNG_UST_TRACER_VERSION:
return lttng_abi_tracer_version(objd,
(struct lttng_ust_tracer_version *) arg);
case LTTNG_UST_TRACEPOINT_LIST:
return lttng_abi_tracepoint_list(owner);
case LTTNG_UST_TRACEPOINT_FIELD_LIST:
return lttng_abi_tracepoint_field_list(owner);
case LTTNG_UST_WAIT_QUIESCENT:
synchronize_trace();
return 0;
default:
return -EINVAL;
}
}
static const struct lttng_ust_objd_ops lttng_ops = {
.cmd = lttng_cmd,
};
int lttng_abi_map_channel(int session_objd,
struct lttng_ust_channel *ust_chan,
union ust_args *uargs,
void *owner)
{
struct lttng_session *session = objd_private(session_objd);
const char *transport_name;
const struct lttng_transport *transport;
const char *chan_name;
int chan_objd;
struct lttng_ust_shm_handle *channel_handle;
struct lttng_channel *lttng_chan;
struct channel *chan;
struct lttng_ust_lib_ring_buffer_config *config;
void *chan_data;
int wakeup_fd;
uint64_t len;
int ret;
enum lttng_ust_chan_type type;
chan_data = uargs->channel.chan_data;
wakeup_fd = uargs->channel.wakeup_fd;
len = ust_chan->len;
type = ust_chan->type;
switch (type) {
case LTTNG_UST_CHAN_PER_CPU:
break;
default:
ret = -EINVAL;
goto invalid;
}
if (session->been_active) {
ret = -EBUSY;
goto active; /* Refuse to add channel to active session */
}
channel_handle = channel_handle_create(chan_data, len, wakeup_fd);
if (!channel_handle) {
ret = -EINVAL;
goto handle_error;
}
chan = shmp(channel_handle, channel_handle->chan);
assert(chan);
chan->handle = channel_handle;
config = &chan->backend.config;
lttng_chan = channel_get_private(chan);
if (!lttng_chan) {
ret = -EINVAL;
goto alloc_error;
}
/* Lookup transport name */
switch (type) {
case LTTNG_UST_CHAN_PER_CPU:
if (config->output == RING_BUFFER_MMAP) {
if (config->mode == RING_BUFFER_OVERWRITE) {
if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) {
transport_name = "relay-overwrite-mmap";
} else {
transport_name = "relay-overwrite-rt-mmap";
}
} else {
if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) {
transport_name = "relay-discard-mmap";
} else {
transport_name = "relay-discard-rt-mmap";
}
}
} else {
ret = -EINVAL;
goto notransport;
}
chan_name = "channel";
break;
default:
ret = -EINVAL;
goto notransport;
}
transport = lttng_transport_find(transport_name);
if (!transport) {
DBG("LTTng transport %s not found\n",
transport_name);
ret = -EINVAL;
goto notransport;
}
chan_objd = objd_alloc(NULL, <tng_channel_ops, owner, chan_name);
if (chan_objd < 0) {
ret = chan_objd;
goto objd_error;
}
/* Initialize our lttng chan */
lttng_chan->chan = chan;
lttng_chan->tstate = 1;
lttng_chan->enabled = 1;
lttng_chan->ctx = NULL;
lttng_chan->session = session;
lttng_chan->ops = &transport->ops;
memcpy(<tng_chan->chan->backend.config,
transport->client_config,
sizeof(lttng_chan->chan->backend.config));
cds_list_add(<tng_chan->node, &session->chan_head);
lttng_chan->header_type = 0;
lttng_chan->handle = channel_handle;
lttng_chan->type = type;
/*
* We tolerate no failure path after channel creation. It will stay
* invariant for the rest of the session.
*/
objd_set_private(chan_objd, lttng_chan);
lttng_chan->objd = chan_objd;
/* The channel created holds a reference on the session */
objd_ref(session_objd);
return chan_objd;
/* error path after channel was created */
objd_error:
notransport:
free(lttng_chan);
alloc_error:
channel_destroy(chan, channel_handle, 0);
return ret;
/*
* error path before channel creation (owning chan_data and
* wakeup_fd).
*/
handle_error:
active:
invalid:
{
int close_ret;
close_ret = close(wakeup_fd);
if (close_ret) {
PERROR("close");
}
}
free(chan_data);
return ret;
}
/**
* lttng_session_cmd - lttng session object command
*
* @obj: the object
* @cmd: the command
* @arg: command arg
* @uargs: UST arguments (internal)
* @owner: objd owner
*
* This descriptor implements lttng commands:
* LTTNG_UST_CHANNEL
* Returns a LTTng channel object descriptor
* LTTNG_UST_ENABLE
* Enables tracing for a session (weak enable)
* LTTNG_UST_DISABLE
* Disables tracing for a session (strong disable)
*
* The returned channel will be deleted when its file descriptor is closed.
*/
static
long lttng_session_cmd(int objd, unsigned int cmd, unsigned long arg,
union ust_args *uargs, void *owner)
{
struct lttng_session *session = objd_private(objd);
switch (cmd) {
case LTTNG_UST_CHANNEL:
return lttng_abi_map_channel(objd,
(struct lttng_ust_channel *) arg,
uargs, owner);
case LTTNG_UST_SESSION_START:
case LTTNG_UST_ENABLE:
return lttng_session_enable(session);
case LTTNG_UST_SESSION_STOP:
case LTTNG_UST_DISABLE:
return lttng_session_disable(session);
default:
return -EINVAL;
}
}
/*
* Called when the last file reference is dropped.
*
* Big fat note: channels and events are invariant for the whole session after
* their creation. So this session destruction also destroys all channel and
* event structures specific to this session (they are not destroyed when their
* individual file is released).
*/
static
int lttng_release_session(int objd)
{
struct lttng_session *session = objd_private(objd);
if (session) {
lttng_session_destroy(session);
return 0;
} else {
return -EINVAL;
}
}
static const struct lttng_ust_objd_ops lttng_session_ops = {
.release = lttng_release_session,
.cmd = lttng_session_cmd,
};
static
long lttng_tracepoint_list_cmd(int objd, unsigned int cmd, unsigned long arg,
union ust_args *uargs, void *owner)
{
struct lttng_ust_tracepoint_list *list = objd_private(objd);
struct lttng_ust_tracepoint_iter *tp =
(struct lttng_ust_tracepoint_iter *) arg;
struct lttng_ust_tracepoint_iter *iter;
switch (cmd) {
case LTTNG_UST_TRACEPOINT_LIST_GET:
{
iter = lttng_ust_tracepoint_list_get_iter_next(list);
if (!iter)
return -LTTNG_UST_ERR_NOENT;
memcpy(tp, iter, sizeof(*tp));
return 0;
}
default:
return -EINVAL;
}
}
static
int lttng_abi_tracepoint_list(void *owner)
{
int list_objd, ret;
struct lttng_ust_tracepoint_list *list;
list_objd = objd_alloc(NULL, <tng_tracepoint_list_ops, owner, "tp_list");
if (list_objd < 0) {
ret = list_objd;
goto objd_error;
}
list = zmalloc(sizeof(*list));
if (!list) {
ret = -ENOMEM;
goto alloc_error;
}
objd_set_private(list_objd, list);
/* populate list by walking on all registered probes. */
ret = lttng_probes_get_event_list(list);
if (ret) {
goto list_error;
}
return list_objd;
list_error:
free(list);
alloc_error:
{
int err;
err = lttng_ust_objd_unref(list_objd, 1);
assert(!err);
}
objd_error:
return ret;
}
static
int lttng_release_tracepoint_list(int objd)
{
struct lttng_ust_tracepoint_list *list = objd_private(objd);
if (list) {
lttng_probes_prune_event_list(list);
free(list);
return 0;
} else {
return -EINVAL;
}
}
static const struct lttng_ust_objd_ops lttng_tracepoint_list_ops = {
.release = lttng_release_tracepoint_list,
.cmd = lttng_tracepoint_list_cmd,
};
static
long lttng_tracepoint_field_list_cmd(int objd, unsigned int cmd,
unsigned long arg, union ust_args *uargs, void *owner)
{
struct lttng_ust_field_list *list = objd_private(objd);
struct lttng_ust_field_iter *tp = &uargs->field_list.entry;
struct lttng_ust_field_iter *iter;
switch (cmd) {
case LTTNG_UST_TRACEPOINT_FIELD_LIST_GET:
{
iter = lttng_ust_field_list_get_iter_next(list);
if (!iter)
return -LTTNG_UST_ERR_NOENT;
memcpy(tp, iter, sizeof(*tp));
return 0;
}
default:
return -EINVAL;
}
}
static
int lttng_abi_tracepoint_field_list(void *owner)
{
int list_objd, ret;
struct lttng_ust_field_list *list;
list_objd = objd_alloc(NULL, <tng_tracepoint_field_list_ops, owner,
"tp_field_list");
if (list_objd < 0) {
ret = list_objd;
goto objd_error;
}
list = zmalloc(sizeof(*list));
if (!list) {
ret = -ENOMEM;
goto alloc_error;
}
objd_set_private(list_objd, list);
/* populate list by walking on all registered probes. */
ret = lttng_probes_get_field_list(list);
if (ret) {
goto list_error;
}
return list_objd;
list_error:
free(list);
alloc_error:
{
int err;
err = lttng_ust_objd_unref(list_objd, 1);
assert(!err);
}
objd_error:
return ret;
}
static
int lttng_release_tracepoint_field_list(int objd)
{
struct lttng_ust_field_list *list = objd_private(objd);
if (list) {
lttng_probes_prune_field_list(list);
free(list);
return 0;
} else {
return -EINVAL;
}
}
static const struct lttng_ust_objd_ops lttng_tracepoint_field_list_ops = {
.release = lttng_release_tracepoint_field_list,
.cmd = lttng_tracepoint_field_list_cmd,
};
static
int lttng_abi_map_stream(int channel_objd, struct lttng_ust_stream *info,
union ust_args *uargs, void *owner)
{
struct lttng_channel *channel = objd_private(channel_objd);
int ret;
ret = channel_handle_add_stream(channel->handle,
uargs->stream.shm_fd, uargs->stream.wakeup_fd,
info->stream_nr, info->len);
if (ret)
goto error_add_stream;
return 0;
error_add_stream:
return ret;
}
static
int lttng_abi_create_enabler(int channel_objd,
struct lttng_ust_event *event_param,
void *owner,
enum lttng_enabler_type type)
{
struct lttng_channel *channel = objd_private(channel_objd);
struct lttng_enabler *enabler;
int event_objd, ret;
event_param->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
event_objd = objd_alloc(NULL, <tng_enabler_ops, owner, "enabler");
if (event_objd < 0) {
ret = event_objd;
goto objd_error;
}
/*
* We tolerate no failure path after event creation. It will stay
* invariant for the rest of the session.
*/
enabler = lttng_enabler_create(type, event_param, channel);
if (!enabler) {
ret = -ENOMEM;
goto event_error;
}
objd_set_private(event_objd, enabler);
/* The event holds a reference on the channel */
objd_ref(channel_objd);
return event_objd;
event_error:
{
int err;
err = lttng_ust_objd_unref(event_objd, 1);
assert(!err);
}
objd_error:
return ret;
}
/**
* lttng_channel_cmd - lttng control through object descriptors
*
* @objd: the object descriptor
* @cmd: the command
* @arg: command arg
* @uargs: UST arguments (internal)
* @owner: objd owner
*
* This object descriptor implements lttng commands:
* LTTNG_UST_STREAM
* Returns an event stream object descriptor or failure.
* (typically, one event stream records events from one CPU)
* LTTNG_UST_EVENT
* Returns an event object descriptor or failure.
* LTTNG_UST_CONTEXT
* Prepend a context field to each event in the channel
* LTTNG_UST_ENABLE
* Enable recording for events in this channel (weak enable)
* LTTNG_UST_DISABLE
* Disable recording for events in this channel (strong disable)
*
* Channel and event file descriptors also hold a reference on the session.
*/
static
long lttng_channel_cmd(int objd, unsigned int cmd, unsigned long arg,
union ust_args *uargs, void *owner)
{
struct lttng_channel *channel = objd_private(objd);
if (cmd != LTTNG_UST_STREAM) {
/*
* Check if channel received all streams.
*/
if (!lttng_is_channel_ready(channel))
return -EPERM;
}
switch (cmd) {
case LTTNG_UST_STREAM:
{
struct lttng_ust_stream *stream;
stream = (struct lttng_ust_stream *) arg;
/* stream used as output */
return lttng_abi_map_stream(objd, stream, uargs, owner);
}
case LTTNG_UST_EVENT:
{
struct lttng_ust_event *event_param =
(struct lttng_ust_event *) arg;
if (event_param->name[strlen(event_param->name) - 1] == '*') {
/* If ends with wildcard, create wildcard. */
return lttng_abi_create_enabler(objd, event_param,
owner, LTTNG_ENABLER_WILDCARD);
} else {
return lttng_abi_create_enabler(objd, event_param,
owner, LTTNG_ENABLER_EVENT);
}
}
case LTTNG_UST_CONTEXT:
return lttng_abi_add_context(objd,
(struct lttng_ust_context *) arg, uargs,
&channel->ctx, channel->session);
case LTTNG_UST_ENABLE:
return lttng_channel_enable(channel);
case LTTNG_UST_DISABLE:
return lttng_channel_disable(channel);
case LTTNG_UST_FLUSH_BUFFER:
return channel->ops->flush_buffer(channel->chan, channel->handle);
default:
return -EINVAL;
}
}
static
int lttng_channel_release(int objd)
{
struct lttng_channel *channel = objd_private(objd);
if (channel)
return lttng_ust_objd_unref(channel->session->objd, 0);
return 0;
}
static const struct lttng_ust_objd_ops lttng_channel_ops = {
.release = lttng_channel_release,
.cmd = lttng_channel_cmd,
};
/**
* lttng_enabler_cmd - lttng control through object descriptors
*
* @objd: the object descriptor
* @cmd: the command
* @arg: command arg
* @uargs: UST arguments (internal)
* @owner: objd owner
*
* This object descriptor implements lttng commands:
* LTTNG_UST_CONTEXT
* Prepend a context field to each record of events of this
* enabler.
* LTTNG_UST_ENABLE
* Enable recording for this enabler
* LTTNG_UST_DISABLE
* Disable recording for this enabler
* LTTNG_UST_FILTER
* Attach a filter to an enabler.
* LTTNG_UST_EXCLUSION
* Attach exclusions to an enabler.
*/
static
long lttng_enabler_cmd(int objd, unsigned int cmd, unsigned long arg,
union ust_args *uargs, void *owner)
{
struct lttng_enabler *enabler = objd_private(objd);
switch (cmd) {
case LTTNG_UST_CONTEXT:
return lttng_enabler_attach_context(enabler,
(struct lttng_ust_context *) arg);
case LTTNG_UST_ENABLE:
return lttng_enabler_enable(enabler);
case LTTNG_UST_DISABLE:
return lttng_enabler_disable(enabler);
case LTTNG_UST_FILTER:
{
int ret;
ret = lttng_enabler_attach_bytecode(enabler,
(struct lttng_ust_filter_bytecode_node *) arg);
if (ret)
return ret;
return 0;
}
case LTTNG_UST_EXCLUSION:
{
return lttng_enabler_attach_exclusion(enabler,
(struct lttng_ust_excluder_node *) arg);
}
default:
return -EINVAL;
}
}
static
int lttng_enabler_release(int objd)
{
struct lttng_enabler *enabler = objd_private(objd);
if (enabler)
return lttng_ust_objd_unref(enabler->chan->objd, 0);
return 0;
}
static const struct lttng_ust_objd_ops lttng_enabler_ops = {
.release = lttng_enabler_release,
.cmd = lttng_enabler_cmd,
};
void lttng_ust_abi_exit(void)
{
lttng_ust_abi_close_in_progress = 1;
ust_lock_nocheck();
objd_table_destroy();
ust_unlock();
lttng_ust_abi_close_in_progress = 0;
}