+++ /dev/null
-/*
- * 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;
- 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 = 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);
- obj->u.s.f_count++;
-}
-
-int lttng_ust_objd_unref(int id)
-{
- 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 ((--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++)
- (void) lttng_ust_objd_unref(i);
- 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 == owner)
- (void) lttng_ust_objd_unref(i);
- }
-}
-
-/*
- * 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,
- struct lttng_ctx **ctx, struct lttng_session *session)
-{
- return lttng_attach_context(context_param, 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;
- uint64_t len;
- int ret;
- enum lttng_ust_chan_type type;
-
- chan_data = uargs->channel.chan_data;
- len = ust_chan->len;
- type = ust_chan->type;
-
- switch (type) {
- case LTTNG_UST_CHAN_PER_CPU:
- break;
- default:
- return -EINVAL;
- }
-
- if (session->been_active) {
- ret = -EBUSY;
- goto active; /* Refuse to add channel to active session */
- }
-
- channel_handle = channel_handle_create(chan_data, len);
- 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) {
- transport_name = config->mode == RING_BUFFER_OVERWRITE ?
- "relay-overwrite-mmap" : "relay-discard-mmap";
- } else {
- ret = -EINVAL;
- goto notransport;
- }
- chan_name = "channel";
- break;
- default:
- transport_name = "<unknown>";
- chan_name = "<unknown>";
- 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;
-
-objd_error:
-notransport:
- free(lttng_chan);
-alloc_error:
- channel_destroy(chan, channel_handle, 0);
-handle_error:
-active:
- 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);
- 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);
- 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);
- 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,
- &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);
- 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.
- */
-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;
- }
- 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);
- 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;
- objd_table_destroy();
- lttng_ust_abi_close_in_progress = 0;
-}
projects / lttng-ust.git / blobdiff