liblttng-ust/lttng-ust-abi.c

   1 /*
   2  * SPDX-License-Identifier: LGPL-2.1-only
   3  *
   4  * Copyright (C) 2010-2012 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   5  *
   6  * LTTng UST ABI
   7  *
   8  * Mimic system calls for:
   9  * - session creation, returns an object descriptor or failure.
  10  *   - channel creation, returns an object descriptor or failure.
  11  *     - Operates on a session object descriptor
  12  *     - Takes all channel options as parameters.
  13  *   - stream get, returns an object descriptor or failure.
  14  *     - Operates on a channel object descriptor.
  15  *   - stream notifier get, returns an object descriptor or failure.
  16  *     - Operates on a channel object descriptor.
  17  *   - event creation, returns an object descriptor or failure.
  18  *     - Operates on a channel object descriptor
  19  *     - Takes an event name as parameter
  20  *     - Takes an instrumentation source as parameter
  21  *       - e.g. tracepoints, dynamic_probes...
  22  *     - Takes instrumentation source specific arguments.
  23  */
  24
  25 #define _LGPL_SOURCE
  26 #include <fcntl.h>
  27 #include <stdint.h>
  28 #include <unistd.h>
  29
  30 #include <urcu/compiler.h>
  31 #include <urcu/list.h>
  32
  33 #include <lttng/tracepoint.h>
  34 #include <lttng/ust-abi.h>
  35 #include <lttng/ust-error.h>
  36 #include <lttng/ust-events.h>
  37 #include <lttng/ust-version.h>
  38 #include <ust-fd.h>
  39 #include <usterr-signal-safe.h>
  40
  41 #include "../libringbuffer/frontend_types.h"
  42 #include "../libringbuffer/shm.h"
  43 #include "../libcounter/counter.h"
  44 #include "tracepoint-internal.h"
  45 #include "lttng-tracer.h"
  46 #include "string-utils.h"
  47 #include "ust-events-internal.h"
  48 #include "context-internal.h"
  49 #include "ust-helper.h"
  50
  51 #define OBJ_NAME_LEN    16
  52
  53 static int lttng_ust_abi_close_in_progress;
  54
  55 static
  56 int lttng_abi_tracepoint_list(void *owner);
  57 static
  58 int lttng_abi_tracepoint_field_list(void *owner);
  59
  60 /*
  61  * Object descriptor table. Should be protected from concurrent access
  62  * by the caller.
  63  */
  64
  65 struct lttng_ust_abi_obj {
  66         union {
  67                 struct {
  68                         void *private_data;
  69                         const struct lttng_ust_abi_objd_ops *ops;
  70                         int f_count;
  71                         int owner_ref;  /* has ref from owner */
  72                         void *owner;
  73                         char name[OBJ_NAME_LEN];
  74                 } s;
  75                 int freelist_next;      /* offset freelist. end is -1. */
  76         } u;
  77 };
  78
  79 struct lttng_ust_abi_objd_table {
  80         struct lttng_ust_abi_obj *array;
  81         unsigned int len, allocated_len;
  82         int freelist_head;              /* offset freelist head. end is -1 */
  83 };
  84
  85 static struct lttng_ust_abi_objd_table objd_table = {
  86         .freelist_head = -1,
  87 };
  88
  89 static
  90 int objd_alloc(void *private_data, const struct lttng_ust_abi_objd_ops *ops,
  91                 void *owner, const char *name)
  92 {
  93         struct lttng_ust_abi_obj *obj;
  94
  95         if (objd_table.freelist_head != -1) {
  96                 obj = &objd_table.array[objd_table.freelist_head];
  97                 objd_table.freelist_head = obj->u.freelist_next;
  98                 goto end;
  99         }
 100
 101         if (objd_table.len >= objd_table.allocated_len) {
 102                 unsigned int new_allocated_len, old_allocated_len;
 103                 struct lttng_ust_abi_obj *new_table, *old_table;
 104
 105                 old_allocated_len = objd_table.allocated_len;
 106                 old_table = objd_table.array;
 107                 if (!old_allocated_len)
 108                         new_allocated_len = 1;
 109                 else
 110                         new_allocated_len = old_allocated_len << 1;
 111                 new_table = zmalloc(sizeof(struct lttng_ust_abi_obj) * new_allocated_len);
 112                 if (!new_table)
 113                         return -ENOMEM;
 114                 memcpy(new_table, old_table,
 115                        sizeof(struct lttng_ust_abi_obj) * old_allocated_len);
 116                 free(old_table);
 117                 objd_table.array = new_table;
 118                 objd_table.allocated_len = new_allocated_len;
 119         }
 120         obj = &objd_table.array[objd_table.len];
 121         objd_table.len++;
 122 end:
 123         obj->u.s.private_data = private_data;
 124         obj->u.s.ops = ops;
 125         obj->u.s.f_count = 2;   /* count == 1 : object is allocated */
 126                                 /* count == 2 : allocated + hold ref */
 127         obj->u.s.owner_ref = 1; /* One owner reference */
 128         obj->u.s.owner = owner;
 129         strncpy(obj->u.s.name, name, OBJ_NAME_LEN);
 130         obj->u.s.name[OBJ_NAME_LEN - 1] = '\0';
 131         return obj - objd_table.array;
 132 }
 133
 134 static
 135 struct lttng_ust_abi_obj *_objd_get(int id)
 136 {
 137         if (id >= objd_table.len)
 138                 return NULL;
 139         if (!objd_table.array[id].u.s.f_count)
 140                 return NULL;
 141         return &objd_table.array[id];
 142 }
 143
 144 static
 145 void *objd_private(int id)
 146 {
 147         struct lttng_ust_abi_obj *obj = _objd_get(id);
 148         assert(obj);
 149         return obj->u.s.private_data;
 150 }
 151
 152 static
 153 void objd_set_private(int id, void *private_data)
 154 {
 155         struct lttng_ust_abi_obj *obj = _objd_get(id);
 156         assert(obj);
 157         obj->u.s.private_data = private_data;
 158 }
 159
 160 const struct lttng_ust_abi_objd_ops *lttng_ust_abi_objd_ops(int id)
 161 {
 162         struct lttng_ust_abi_obj *obj = _objd_get(id);
 163
 164         if (!obj)
 165                 return NULL;
 166         return obj->u.s.ops;
 167 }
 168
 169 static
 170 void objd_free(int id)
 171 {
 172         struct lttng_ust_abi_obj *obj = _objd_get(id);
 173
 174         assert(obj);
 175         obj->u.freelist_next = objd_table.freelist_head;
 176         objd_table.freelist_head = obj - objd_table.array;
 177         assert(obj->u.s.f_count == 1);
 178         obj->u.s.f_count = 0;   /* deallocated */
 179 }
 180
 181 static
 182 void objd_ref(int id)
 183 {
 184         struct lttng_ust_abi_obj *obj = _objd_get(id);
 185         assert(obj != NULL);
 186         obj->u.s.f_count++;
 187 }
 188
 189 int lttng_ust_abi_objd_unref(int id, int is_owner)
 190 {
 191         struct lttng_ust_abi_obj *obj = _objd_get(id);
 192
 193         if (!obj)
 194                 return -EINVAL;
 195         if (obj->u.s.f_count == 1) {
 196                 ERR("Reference counting error\n");
 197                 return -EINVAL;
 198         }
 199         if (is_owner) {
 200                 if (!obj->u.s.owner_ref) {
 201                         ERR("Error decrementing owner reference");
 202                         return -EINVAL;
 203                 }
 204                 obj->u.s.owner_ref--;
 205         }
 206         if ((--obj->u.s.f_count) == 1) {
 207                 const struct lttng_ust_abi_objd_ops *ops = lttng_ust_abi_objd_ops(id);
 208
 209                 if (ops->release)
 210                         ops->release(id);
 211                 objd_free(id);
 212         }
 213         return 0;
 214 }
 215
 216 static
 217 void objd_table_destroy(void)
 218 {
 219         int i;
 220
 221         for (i = 0; i < objd_table.allocated_len; i++) {
 222                 struct lttng_ust_abi_obj *obj;
 223
 224                 obj = _objd_get(i);
 225                 if (!obj)
 226                         continue;
 227                 if (!obj->u.s.owner_ref)
 228                         continue;       /* only unref owner ref. */
 229                 (void) lttng_ust_abi_objd_unref(i, 1);
 230         }
 231         free(objd_table.array);
 232         objd_table.array = NULL;
 233         objd_table.len = 0;
 234         objd_table.allocated_len = 0;
 235         objd_table.freelist_head = -1;
 236 }
 237
 238 const char *lttng_ust_obj_get_name(int id)
 239 {
 240         struct lttng_ust_abi_obj *obj = _objd_get(id);
 241
 242         if (!obj)
 243                 return NULL;
 244         return obj->u.s.name;
 245 }
 246
 247 void lttng_ust_abi_objd_table_owner_cleanup(void *owner)
 248 {
 249         int i;
 250
 251         for (i = 0; i < objd_table.allocated_len; i++) {
 252                 struct lttng_ust_abi_obj *obj;
 253
 254                 obj = _objd_get(i);
 255                 if (!obj)
 256                         continue;
 257                 if (!obj->u.s.owner)
 258                         continue;       /* skip root handles */
 259                 if (!obj->u.s.owner_ref)
 260                         continue;       /* only unref owner ref. */
 261                 if (obj->u.s.owner == owner)
 262                         (void) lttng_ust_abi_objd_unref(i, 1);
 263         }
 264 }
 265
 266 /*
 267  * This is LTTng's own personal way to create an ABI for sessiond.
 268  * We send commands over a socket.
 269  */
 270
 271 static const struct lttng_ust_abi_objd_ops lttng_ops;
 272 static const struct lttng_ust_abi_objd_ops lttng_event_notifier_group_ops;
 273 static const struct lttng_ust_abi_objd_ops lttng_session_ops;
 274 static const struct lttng_ust_abi_objd_ops lttng_channel_ops;
 275 static const struct lttng_ust_abi_objd_ops lttng_event_enabler_ops;
 276 static const struct lttng_ust_abi_objd_ops lttng_event_notifier_enabler_ops;
 277 static const struct lttng_ust_abi_objd_ops lttng_tracepoint_list_ops;
 278 static const struct lttng_ust_abi_objd_ops lttng_tracepoint_field_list_ops;
 279
 280 int lttng_abi_create_root_handle(void)
 281 {
 282         int root_handle;
 283
 284         /* root handles have NULL owners */
 285         root_handle = objd_alloc(NULL, &lttng_ops, NULL, "root");
 286         return root_handle;
 287 }
 288
 289 static
 290 int lttng_is_channel_ready(struct lttng_ust_channel_buffer *lttng_chan)
 291 {
 292         struct lttng_ust_lib_ring_buffer_channel *chan;
 293         unsigned int nr_streams, exp_streams;
 294
 295         chan = lttng_chan->chan;
 296         nr_streams = channel_handle_get_nr_streams(lttng_chan->handle);
 297         exp_streams = chan->nr_streams;
 298         return nr_streams == exp_streams;
 299 }
 300
 301 static
 302 int lttng_abi_create_session(void *owner)
 303 {
 304         struct lttng_ust_session *session;
 305         int session_objd, ret;
 306
 307         session = lttng_session_create();
 308         if (!session)
 309                 return -ENOMEM;
 310         session_objd = objd_alloc(session, &lttng_session_ops, owner, "session");
 311         if (session_objd < 0) {
 312                 ret = session_objd;
 313                 goto objd_error;
 314         }
 315         session->priv->objd = session_objd;
 316         session->priv->owner = owner;
 317         return session_objd;
 318
 319 objd_error:
 320         lttng_session_destroy(session);
 321         return ret;
 322 }
 323
 324 static
 325 long lttng_abi_tracer_version(int objd,
 326         struct lttng_ust_abi_tracer_version *v)
 327 {
 328         v->major = LTTNG_UST_MAJOR_VERSION;
 329         v->minor = LTTNG_UST_MINOR_VERSION;
 330         v->patchlevel = LTTNG_UST_PATCHLEVEL_VERSION;
 331         return 0;
 332 }
 333
 334 static
 335 int lttng_abi_event_notifier_send_fd(void *owner, int *event_notifier_notif_fd)
 336 {
 337         struct lttng_event_notifier_group *event_notifier_group;
 338         int event_notifier_group_objd, ret, fd_flag;
 339
 340         event_notifier_group = lttng_event_notifier_group_create();
 341         if (!event_notifier_group)
 342                 return -ENOMEM;
 343
 344         /*
 345          * Set this file descriptor as NON-BLOCKING.
 346          */
 347         fd_flag = fcntl(*event_notifier_notif_fd, F_GETFL);
 348
 349         fd_flag |= O_NONBLOCK;
 350
 351         ret = fcntl(*event_notifier_notif_fd, F_SETFL, fd_flag);
 352         if (ret) {
 353                 ret = -errno;
 354                 goto fd_error;
 355         }
 356
 357         event_notifier_group_objd = objd_alloc(event_notifier_group,
 358                 &lttng_event_notifier_group_ops, owner, "event_notifier_group");
 359         if (event_notifier_group_objd < 0) {
 360                 ret = event_notifier_group_objd;
 361                 goto objd_error;
 362         }
 363
 364         event_notifier_group->objd = event_notifier_group_objd;
 365         event_notifier_group->owner = owner;
 366         event_notifier_group->notification_fd = *event_notifier_notif_fd;
 367         /* Object descriptor takes ownership of notification fd. */
 368         *event_notifier_notif_fd = -1;
 369
 370         return event_notifier_group_objd;
 371
 372 objd_error:
 373         lttng_event_notifier_group_destroy(event_notifier_group);
 374 fd_error:
 375         return ret;
 376 }
 377
 378 static
 379 long lttng_abi_add_context(int objd,
 380         struct lttng_ust_abi_context *context_param,
 381         union lttng_ust_abi_args *uargs,
 382         struct lttng_ust_ctx **ctx, struct lttng_ust_session *session)
 383 {
 384         return lttng_attach_context(context_param, uargs, ctx, session);
 385 }
 386
 387 /**
 388  *      lttng_cmd - lttng control through socket commands
 389  *
 390  *      @objd: the object descriptor
 391  *      @cmd: the command
 392  *      @arg: command arg
 393  *      @uargs: UST arguments (internal)
 394  *      @owner: objd owner
 395  *
 396  *      This descriptor implements lttng commands:
 397  *      LTTNG_UST_ABI_SESSION
 398  *              Returns a LTTng trace session object descriptor
 399  *      LTTNG_UST_ABI_TRACER_VERSION
 400  *              Returns the LTTng kernel tracer version
 401  *      LTTNG_UST_ABI_TRACEPOINT_LIST
 402  *              Returns a file descriptor listing available tracepoints
 403  *      LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST
 404  *              Returns a file descriptor listing available tracepoint fields
 405  *      LTTNG_UST_ABI_WAIT_QUIESCENT
 406  *              Returns after all previously running probes have completed
 407  *
 408  * The returned session will be deleted when its file descriptor is closed.
 409  */
 410 static
 411 long lttng_cmd(int objd, unsigned int cmd, unsigned long arg,
 412         union lttng_ust_abi_args *uargs, void *owner)
 413 {
 414         switch (cmd) {
 415         case LTTNG_UST_ABI_SESSION:
 416                 return lttng_abi_create_session(owner);
 417         case LTTNG_UST_ABI_TRACER_VERSION:
 418                 return lttng_abi_tracer_version(objd,
 419                                 (struct lttng_ust_abi_tracer_version *) arg);
 420         case LTTNG_UST_ABI_TRACEPOINT_LIST:
 421                 return lttng_abi_tracepoint_list(owner);
 422         case LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST:
 423                 return lttng_abi_tracepoint_field_list(owner);
 424         case LTTNG_UST_ABI_WAIT_QUIESCENT:
 425                 lttng_ust_urcu_synchronize_rcu();
 426                 return 0;
 427         case LTTNG_UST_ABI_EVENT_NOTIFIER_GROUP_CREATE:
 428                 return lttng_abi_event_notifier_send_fd(owner,
 429                         &uargs->event_notifier_handle.event_notifier_notif_fd);
 430         default:
 431                 return -EINVAL;
 432         }
 433 }
 434
 435 static const struct lttng_ust_abi_objd_ops lttng_ops = {
 436         .cmd = lttng_cmd,
 437 };
 438
 439 static
 440 int lttng_abi_map_channel(int session_objd,
 441                 struct lttng_ust_abi_channel *ust_chan,
 442                 union lttng_ust_abi_args *uargs,
 443                 void *owner)
 444 {
 445         struct lttng_ust_session *session = objd_private(session_objd);
 446         const char *transport_name;
 447         struct lttng_transport *transport;
 448         const char *chan_name;
 449         int chan_objd;
 450         struct lttng_ust_shm_handle *channel_handle;
 451         struct lttng_ust_abi_channel_config *lttng_chan_config;
 452         struct lttng_ust_channel_buffer *lttng_chan_buf;
 453         struct lttng_ust_lib_ring_buffer_channel *chan;
 454         struct lttng_ust_lib_ring_buffer_config *config;
 455         void *chan_data;
 456         int wakeup_fd;
 457         uint64_t len;
 458         int ret;
 459         enum lttng_ust_abi_chan_type type;
 460
 461         chan_data = uargs->channel.chan_data;
 462         wakeup_fd = uargs->channel.wakeup_fd;
 463         len = ust_chan->len;
 464         type = ust_chan->type;
 465
 466         switch (type) {
 467         case LTTNG_UST_ABI_CHAN_PER_CPU:
 468                 break;
 469         default:
 470                 ret = -EINVAL;
 471                 goto invalid;
 472         }
 473
 474         if (session->priv->been_active) {
 475                 ret = -EBUSY;
 476                 goto active;    /* Refuse to add channel to active session */
 477         }
 478
 479         lttng_chan_buf = lttng_ust_alloc_channel_buffer();
 480         if (!lttng_chan_buf) {
 481                 ret = -ENOMEM;
 482                 goto lttng_chan_buf_error;
 483         }
 484
 485         channel_handle = channel_handle_create(chan_data, len, wakeup_fd);
 486         if (!channel_handle) {
 487                 ret = -EINVAL;
 488                 goto handle_error;
 489         }
 490
 491         /* Ownership of chan_data and wakeup_fd taken by channel handle. */
 492         uargs->channel.chan_data = NULL;
 493         uargs->channel.wakeup_fd = -1;
 494
 495         chan = shmp(channel_handle, channel_handle->chan);
 496         assert(chan);
 497         chan->handle = channel_handle;
 498         config = &chan->backend.config;
 499         lttng_chan_config = channel_get_private_config(chan);
 500         if (!lttng_chan_config) {
 501                 ret = -EINVAL;
 502                 goto alloc_error;
 503         }
 504
 505         /* Lookup transport name */
 506         switch (type) {
 507         case LTTNG_UST_ABI_CHAN_PER_CPU:
 508                 if (config->output == RING_BUFFER_MMAP) {
 509                         if (config->mode == RING_BUFFER_OVERWRITE) {
 510                                 if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) {
 511                                         transport_name = "relay-overwrite-mmap";
 512                                 } else {
 513                                         transport_name = "relay-overwrite-rt-mmap";
 514                                 }
 515                         } else {
 516                                 if (config->wakeup == RING_BUFFER_WAKEUP_BY_WRITER) {
 517                                         transport_name = "relay-discard-mmap";
 518                                 } else {
 519                                         transport_name = "relay-discard-rt-mmap";
 520                                 }
 521                         }
 522                 } else {
 523                         ret = -EINVAL;
 524                         goto notransport;
 525                 }
 526                 chan_name = "channel";
 527                 break;
 528         default:
 529                 ret = -EINVAL;
 530                 goto notransport;
 531         }
 532         transport = lttng_ust_transport_find(transport_name);
 533         if (!transport) {
 534                 DBG("LTTng transport %s not found\n",
 535                        transport_name);
 536                 ret = -EINVAL;
 537                 goto notransport;
 538         }
 539
 540         chan_objd = objd_alloc(NULL, &lttng_channel_ops, owner, chan_name);
 541         if (chan_objd < 0) {
 542                 ret = chan_objd;
 543                 goto objd_error;
 544         }
 545
 546         /* Initialize our lttng chan */
 547         lttng_chan_buf->parent->enabled = 1;
 548         lttng_chan_buf->parent->session = session;
 549
 550         lttng_chan_buf->priv->parent.tstate = 1;
 551         lttng_chan_buf->priv->ctx = NULL;
 552
 553         lttng_chan_buf->ops = &transport->ops;
 554         lttng_chan_buf->chan = chan;
 555         lttng_chan_buf->handle = channel_handle;
 556
 557         memcpy(&chan->backend.config,
 558                 transport->client_config,
 559                 sizeof(chan->backend.config));
 560         cds_list_add(&lttng_chan_buf->priv->node, &session->priv->chan_head);
 561         lttng_chan_buf->priv->header_type = 0;
 562         lttng_chan_buf->priv->type = type;
 563         /* Copy fields from lttng ust chan config. */
 564         lttng_chan_buf->priv->id = lttng_chan_config->id;
 565         memcpy(lttng_chan_buf->priv->uuid, lttng_chan_config->uuid, LTTNG_UST_UUID_LEN);
 566         channel_set_private(chan, lttng_chan_buf);
 567
 568         /*
 569          * We tolerate no failure path after channel creation. It will stay
 570          * invariant for the rest of the session.
 571          */
 572         objd_set_private(chan_objd, lttng_chan_buf);
 573         lttng_chan_buf->priv->parent.objd = chan_objd;
 574         /* The channel created holds a reference on the session */
 575         objd_ref(session_objd);
 576         return chan_objd;
 577
 578         /* error path after channel was created */
 579 objd_error:
 580 notransport:
 581 alloc_error:
 582         channel_destroy(chan, channel_handle, 0);
 583         lttng_ust_free_channel_common(lttng_chan_buf->parent);
 584         return ret;
 585
 586 handle_error:
 587         lttng_ust_free_channel_common(lttng_chan_buf->parent);
 588 lttng_chan_buf_error:
 589 active:
 590 invalid:
 591         return ret;
 592 }
 593
 594 /**
 595  *      lttng_session_cmd - lttng session object command
 596  *
 597  *      @obj: the object
 598  *      @cmd: the command
 599  *      @arg: command arg
 600  *      @uargs: UST arguments (internal)
 601  *      @owner: objd owner
 602  *
 603  *      This descriptor implements lttng commands:
 604  *      LTTNG_UST_ABI_CHANNEL
 605  *              Returns a LTTng channel object descriptor
 606  *      LTTNG_UST_ABI_ENABLE
 607  *              Enables tracing for a session (weak enable)
 608  *      LTTNG_UST_ABI_DISABLE
 609  *              Disables tracing for a session (strong disable)
 610  *
 611  * The returned channel will be deleted when its file descriptor is closed.
 612  */
 613 static
 614 long lttng_session_cmd(int objd, unsigned int cmd, unsigned long arg,
 615         union lttng_ust_abi_args *uargs, void *owner)
 616 {
 617         struct lttng_ust_session *session = objd_private(objd);
 618
 619         switch (cmd) {
 620         case LTTNG_UST_ABI_CHANNEL:
 621                 return lttng_abi_map_channel(objd,
 622                                 (struct lttng_ust_abi_channel *) arg,
 623                                 uargs, owner);
 624         case LTTNG_UST_ABI_SESSION_START:
 625         case LTTNG_UST_ABI_ENABLE:
 626                 return lttng_session_enable(session);
 627         case LTTNG_UST_ABI_SESSION_STOP:
 628         case LTTNG_UST_ABI_DISABLE:
 629                 return lttng_session_disable(session);
 630         case LTTNG_UST_ABI_SESSION_STATEDUMP:
 631                 return lttng_session_statedump(session);
 632         case LTTNG_UST_ABI_COUNTER:
 633         case LTTNG_UST_ABI_COUNTER_GLOBAL:
 634         case LTTNG_UST_ABI_COUNTER_CPU:
 635                 /* Not implemented yet. */
 636                 return -EINVAL;
 637         default:
 638                 return -EINVAL;
 639         }
 640 }
 641
 642 /*
 643  * Called when the last file reference is dropped.
 644  *
 645  * Big fat note: channels and events are invariant for the whole session after
 646  * their creation. So this session destruction also destroys all channel and
 647  * event structures specific to this session (they are not destroyed when their
 648  * individual file is released).
 649  */
 650 static
 651 int lttng_release_session(int objd)
 652 {
 653         struct lttng_ust_session *session = objd_private(objd);
 654
 655         if (session) {
 656                 lttng_session_destroy(session);
 657                 return 0;
 658         } else {
 659                 return -EINVAL;
 660         }
 661 }
 662
 663 static const struct lttng_ust_abi_objd_ops lttng_session_ops = {
 664         .release = lttng_release_session,
 665         .cmd = lttng_session_cmd,
 666 };
 667
 668 static int lttng_ust_event_notifier_enabler_create(int event_notifier_group_obj,
 669                 void *owner, struct lttng_ust_abi_event_notifier *event_notifier_param,
 670                 enum lttng_enabler_format_type type)
 671 {
 672         struct lttng_event_notifier_group *event_notifier_group =
 673                 objd_private(event_notifier_group_obj);
 674         struct lttng_event_notifier_enabler *event_notifier_enabler;
 675         int event_notifier_objd, ret;
 676
 677         event_notifier_param->event.name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
 678         event_notifier_objd = objd_alloc(NULL, &lttng_event_notifier_enabler_ops, owner,
 679                 "event_notifier enabler");
 680         if (event_notifier_objd < 0) {
 681                 ret = event_notifier_objd;
 682                 goto objd_error;
 683         }
 684
 685         event_notifier_enabler = lttng_event_notifier_enabler_create(
 686                 event_notifier_group, type, event_notifier_param);
 687         if (!event_notifier_enabler) {
 688                 ret = -ENOMEM;
 689                 goto event_notifier_error;
 690         }
 691
 692         objd_set_private(event_notifier_objd, event_notifier_enabler);
 693         /* The event_notifier holds a reference on the event_notifier group. */
 694         objd_ref(event_notifier_enabler->group->objd);
 695
 696         return event_notifier_objd;
 697
 698 event_notifier_error:
 699         {
 700                 int err;
 701
 702                 err = lttng_ust_abi_objd_unref(event_notifier_objd, 1);
 703                 assert(!err);
 704         }
 705 objd_error:
 706         return ret;
 707 }
 708
 709 static
 710 long lttng_event_notifier_enabler_cmd(int objd, unsigned int cmd, unsigned long arg,
 711                 union lttng_ust_abi_args *uargs, void *owner)
 712 {
 713         struct lttng_event_notifier_enabler *event_notifier_enabler = objd_private(objd);
 714         switch (cmd) {
 715         case LTTNG_UST_ABI_FILTER:
 716                 return lttng_event_notifier_enabler_attach_filter_bytecode(
 717                         event_notifier_enabler,
 718                         (struct lttng_ust_bytecode_node **) arg);
 719         case LTTNG_UST_ABI_EXCLUSION:
 720                 return lttng_event_notifier_enabler_attach_exclusion(event_notifier_enabler,
 721                         (struct lttng_ust_excluder_node **) arg);
 722         case LTTNG_UST_ABI_CAPTURE:
 723                 return lttng_event_notifier_enabler_attach_capture_bytecode(
 724                         event_notifier_enabler,
 725                         (struct lttng_ust_bytecode_node **) arg);
 726         case LTTNG_UST_ABI_ENABLE:
 727                 return lttng_event_notifier_enabler_enable(event_notifier_enabler);
 728         case LTTNG_UST_ABI_DISABLE:
 729                 return lttng_event_notifier_enabler_disable(event_notifier_enabler);
 730         default:
 731                 return -EINVAL;
 732         }
 733 }
 734
 735 /**
 736  *      lttng_event_notifier_group_error_counter_cmd - lttng event_notifier group error counter object command
 737  *
 738  *      @obj: the object
 739  *      @cmd: the command
 740  *      @arg: command arg
 741  *      @uargs: UST arguments (internal)
 742  *      @owner: objd owner
 743  *
 744  *      This descriptor implements lttng commands:
 745  *      LTTNG_UST_ABI_COUNTER_GLOBAL
 746  *        Return negative error code on error, 0 on success.
 747  *      LTTNG_UST_ABI_COUNTER_CPU
 748  *        Return negative error code on error, 0 on success.
 749  */
 750 static
 751 long lttng_event_notifier_group_error_counter_cmd(int objd, unsigned int cmd, unsigned long arg,
 752         union lttng_ust_abi_args *uargs, void *owner)
 753 {
 754         int ret;
 755         struct lttng_counter *counter = objd_private(objd);
 756
 757         switch (cmd) {
 758         case LTTNG_UST_ABI_COUNTER_GLOBAL:
 759                 ret = -EINVAL;  /* Unimplemented. */
 760                 break;
 761         case LTTNG_UST_ABI_COUNTER_CPU:
 762         {
 763                 struct lttng_ust_abi_counter_cpu *counter_cpu =
 764                         (struct lttng_ust_abi_counter_cpu *)arg;
 765
 766                 ret = lttng_counter_set_cpu_shm(counter->counter,
 767                         counter_cpu->cpu_nr, uargs->counter_shm.shm_fd);
 768                 if (!ret) {
 769                         /* Take ownership of the shm_fd. */
 770                         uargs->counter_shm.shm_fd = -1;
 771                 }
 772                 break;
 773         }
 774         default:
 775                 ret = -EINVAL;
 776                 break;
 777         }
 778
 779         return ret;
 780 }
 781
 782 __attribute__((visibility("hidden")))
 783 int lttng_release_event_notifier_group_error_counter(int objd)
 784 {
 785         struct lttng_counter *counter = objd_private(objd);
 786
 787         if (counter) {
 788                 return lttng_ust_abi_objd_unref(counter->event_notifier_group->objd, 0);
 789         } else {
 790                 return -EINVAL;
 791         }
 792 }
 793
 794 static const struct lttng_ust_abi_objd_ops lttng_event_notifier_group_error_counter_ops = {
 795         .release = lttng_release_event_notifier_group_error_counter,
 796         .cmd = lttng_event_notifier_group_error_counter_cmd,
 797 };
 798
 799 static
 800 int lttng_ust_event_notifier_group_create_error_counter(int event_notifier_group_objd, void *owner,
 801                 struct lttng_ust_abi_counter_conf *error_counter_conf)
 802 {
 803         const char *counter_transport_name;
 804         struct lttng_event_notifier_group *event_notifier_group =
 805                 objd_private(event_notifier_group_objd);
 806         struct lttng_counter *counter;
 807         int counter_objd, ret;
 808         struct lttng_counter_dimension dimensions[1];
 809         size_t counter_len;
 810
 811         if (event_notifier_group->error_counter)
 812                 return -EBUSY;
 813
 814         if (error_counter_conf->arithmetic != LTTNG_UST_ABI_COUNTER_ARITHMETIC_MODULAR)
 815                 return -EINVAL;
 816
 817         if (error_counter_conf->number_dimensions != 1)
 818                 return -EINVAL;
 819
 820         switch (error_counter_conf->bitness) {
 821         case LTTNG_UST_ABI_COUNTER_BITNESS_64:
 822                 counter_transport_name = "counter-per-cpu-64-modular";
 823                 break;
 824         case LTTNG_UST_ABI_COUNTER_BITNESS_32:
 825                 counter_transport_name = "counter-per-cpu-32-modular";
 826                 break;
 827         default:
 828                 return -EINVAL;
 829         }
 830
 831         counter_objd = objd_alloc(NULL, &lttng_event_notifier_group_error_counter_ops, owner,
 832                 "event_notifier group error counter");
 833         if (counter_objd < 0) {
 834                 ret = counter_objd;
 835                 goto objd_error;
 836         }
 837
 838         counter_len = error_counter_conf->dimensions[0].size;
 839         dimensions[0].size = counter_len;
 840         dimensions[0].underflow_index = 0;
 841         dimensions[0].overflow_index = 0;
 842         dimensions[0].has_underflow = 0;
 843         dimensions[0].has_overflow = 0;
 844
 845         counter = lttng_ust_counter_create(counter_transport_name, 1, dimensions);
 846         if (!counter) {
 847                 ret = -EINVAL;
 848                 goto create_error;
 849         }
 850
 851         event_notifier_group->error_counter_len = counter_len;
 852         /*
 853          * store-release to publish error counter matches load-acquire
 854          * in record_error. Ensures the counter is created and the
 855          * error_counter_len is set before they are used.
 856          * Currently a full memory barrier is used, which could be
 857          * turned into acquire-release barriers.
 858          */
 859         cmm_smp_mb();
 860         CMM_STORE_SHARED(event_notifier_group->error_counter, counter);
 861
 862         counter->objd = counter_objd;
 863         counter->event_notifier_group = event_notifier_group;   /* owner */
 864
 865         objd_set_private(counter_objd, counter);
 866         /* The error counter holds a reference on the event_notifier group. */
 867         objd_ref(event_notifier_group->objd);
 868
 869         return counter_objd;
 870
 871 create_error:
 872         {
 873                 int err;
 874
 875                 err = lttng_ust_abi_objd_unref(counter_objd, 1);
 876                 assert(!err);
 877         }
 878 objd_error:
 879         return ret;
 880 }
 881
 882 static
 883 long lttng_event_notifier_group_cmd(int objd, unsigned int cmd, unsigned long arg,
 884                 union lttng_ust_abi_args *uargs, void *owner)
 885 {
 886         switch (cmd) {
 887         case LTTNG_UST_ABI_EVENT_NOTIFIER_CREATE:
 888         {
 889                 struct lttng_ust_abi_event_notifier *event_notifier_param =
 890                         (struct lttng_ust_abi_event_notifier *) arg;
 891                 if (strutils_is_star_glob_pattern(event_notifier_param->event.name)) {
 892                         /*
 893                          * If the event name is a star globbing pattern,
 894                          * we create the special star globbing enabler.
 895                          */
 896                         return lttng_ust_event_notifier_enabler_create(objd,
 897                                         owner, event_notifier_param,
 898                                         LTTNG_ENABLER_FORMAT_STAR_GLOB);
 899                 } else {
 900                         return lttng_ust_event_notifier_enabler_create(objd,
 901                                         owner, event_notifier_param,
 902                                         LTTNG_ENABLER_FORMAT_EVENT);
 903                 }
 904         }
 905         case LTTNG_UST_ABI_COUNTER:
 906         {
 907                 struct lttng_ust_abi_counter_conf *counter_conf =
 908                         (struct lttng_ust_abi_counter_conf *) uargs->counter.counter_data;
 909                 return lttng_ust_event_notifier_group_create_error_counter(
 910                                 objd, owner, counter_conf);
 911         }
 912         default:
 913                 return -EINVAL;
 914         }
 915 }
 916
 917 static
 918 int lttng_event_notifier_enabler_release(int objd)
 919 {
 920         struct lttng_event_notifier_enabler *event_notifier_enabler = objd_private(objd);
 921
 922         if (event_notifier_enabler)
 923                 return lttng_ust_abi_objd_unref(event_notifier_enabler->group->objd, 0);
 924         return 0;
 925 }
 926
 927 static const struct lttng_ust_abi_objd_ops lttng_event_notifier_enabler_ops = {
 928         .release = lttng_event_notifier_enabler_release,
 929         .cmd = lttng_event_notifier_enabler_cmd,
 930 };
 931
 932 static
 933 int lttng_release_event_notifier_group(int objd)
 934 {
 935         struct lttng_event_notifier_group *event_notifier_group = objd_private(objd);
 936
 937         if (event_notifier_group) {
 938                 lttng_event_notifier_group_destroy(event_notifier_group);
 939                 return 0;
 940         } else {
 941                 return -EINVAL;
 942         }
 943 }
 944
 945 static const struct lttng_ust_abi_objd_ops lttng_event_notifier_group_ops = {
 946         .release = lttng_release_event_notifier_group,
 947         .cmd = lttng_event_notifier_group_cmd,
 948 };
 949
 950 static
 951 long lttng_tracepoint_list_cmd(int objd, unsigned int cmd, unsigned long arg,
 952         union lttng_ust_abi_args *uargs, void *owner)
 953 {
 954         struct lttng_ust_tracepoint_list *list = objd_private(objd);
 955         struct lttng_ust_abi_tracepoint_iter *tp =
 956                 (struct lttng_ust_abi_tracepoint_iter *) arg;
 957         struct lttng_ust_abi_tracepoint_iter *iter;
 958
 959         switch (cmd) {
 960         case LTTNG_UST_ABI_TRACEPOINT_LIST_GET:
 961         {
 962                 iter = lttng_ust_tracepoint_list_get_iter_next(list);
 963                 if (!iter)
 964                         return -LTTNG_UST_ERR_NOENT;
 965                 memcpy(tp, iter, sizeof(*tp));
 966                 return 0;
 967         }
 968         default:
 969                 return -EINVAL;
 970         }
 971 }
 972
 973 static
 974 int lttng_abi_tracepoint_list(void *owner)
 975 {
 976         int list_objd, ret;
 977         struct lttng_ust_tracepoint_list *list;
 978
 979         list_objd = objd_alloc(NULL, &lttng_tracepoint_list_ops, owner, "tp_list");
 980         if (list_objd < 0) {
 981                 ret = list_objd;
 982                 goto objd_error;
 983         }
 984         list = zmalloc(sizeof(*list));
 985         if (!list) {
 986                 ret = -ENOMEM;
 987                 goto alloc_error;
 988         }
 989         objd_set_private(list_objd, list);
 990
 991         /* populate list by walking on all registered probes. */
 992         ret = lttng_probes_get_event_list(list);
 993         if (ret) {
 994                 goto list_error;
 995         }
 996         return list_objd;
 997
 998 list_error:
 999         free(list);
1000 alloc_error:
1001         {
1002                 int err;
1003
1004                 err = lttng_ust_abi_objd_unref(list_objd, 1);
1005                 assert(!err);
1006         }
1007 objd_error:
1008         return ret;
1009 }
1010
1011 static
1012 int lttng_release_tracepoint_list(int objd)
1013 {
1014         struct lttng_ust_tracepoint_list *list = objd_private(objd);
1015
1016         if (list) {
1017                 lttng_probes_prune_event_list(list);
1018                 free(list);
1019                 return 0;
1020         } else {
1021                 return -EINVAL;
1022         }
1023 }
1024
1025 static const struct lttng_ust_abi_objd_ops lttng_tracepoint_list_ops = {
1026         .release = lttng_release_tracepoint_list,
1027         .cmd = lttng_tracepoint_list_cmd,
1028 };
1029
1030 static
1031 long lttng_tracepoint_field_list_cmd(int objd, unsigned int cmd,
1032         unsigned long arg, union lttng_ust_abi_args *uargs, void *owner)
1033 {
1034         struct lttng_ust_field_list *list = objd_private(objd);
1035         struct lttng_ust_abi_field_iter *tp = &uargs->field_list.entry;
1036         struct lttng_ust_abi_field_iter *iter;
1037
1038         switch (cmd) {
1039         case LTTNG_UST_ABI_TRACEPOINT_FIELD_LIST_GET:
1040         {
1041                 iter = lttng_ust_field_list_get_iter_next(list);
1042                 if (!iter)
1043                         return -LTTNG_UST_ERR_NOENT;
1044                 memcpy(tp, iter, sizeof(*tp));
1045                 return 0;
1046         }
1047         default:
1048                 return -EINVAL;
1049         }
1050 }
1051
1052 static
1053 int lttng_abi_tracepoint_field_list(void *owner)
1054 {
1055         int list_objd, ret;
1056         struct lttng_ust_field_list *list;
1057
1058         list_objd = objd_alloc(NULL, &lttng_tracepoint_field_list_ops, owner,
1059                         "tp_field_list");
1060         if (list_objd < 0) {
1061                 ret = list_objd;
1062                 goto objd_error;
1063         }
1064         list = zmalloc(sizeof(*list));
1065         if (!list) {
1066                 ret = -ENOMEM;
1067                 goto alloc_error;
1068         }
1069         objd_set_private(list_objd, list);
1070
1071         /* populate list by walking on all registered probes. */
1072         ret = lttng_probes_get_field_list(list);
1073         if (ret) {
1074                 goto list_error;
1075         }
1076         return list_objd;
1077
1078 list_error:
1079         free(list);
1080 alloc_error:
1081         {
1082                 int err;
1083
1084                 err = lttng_ust_abi_objd_unref(list_objd, 1);
1085                 assert(!err);
1086         }
1087 objd_error:
1088         return ret;
1089 }
1090
1091 static
1092 int lttng_release_tracepoint_field_list(int objd)
1093 {
1094         struct lttng_ust_field_list *list = objd_private(objd);
1095
1096         if (list) {
1097                 lttng_probes_prune_field_list(list);
1098                 free(list);
1099                 return 0;
1100         } else {
1101                 return -EINVAL;
1102         }
1103 }
1104
1105 static const struct lttng_ust_abi_objd_ops lttng_tracepoint_field_list_ops = {
1106         .release = lttng_release_tracepoint_field_list,
1107         .cmd = lttng_tracepoint_field_list_cmd,
1108 };
1109
1110 static
1111 int lttng_abi_map_stream(int channel_objd, struct lttng_ust_abi_stream *info,
1112                 union lttng_ust_abi_args *uargs, void *owner)
1113 {
1114         struct lttng_ust_channel_buffer *lttng_chan_buf = objd_private(channel_objd);
1115         int ret;
1116
1117         ret = channel_handle_add_stream(lttng_chan_buf->handle,
1118                 uargs->stream.shm_fd, uargs->stream.wakeup_fd,
1119                 info->stream_nr, info->len);
1120         if (ret)
1121                 goto error_add_stream;
1122         /* Take ownership of shm_fd and wakeup_fd. */
1123         uargs->stream.shm_fd = -1;
1124         uargs->stream.wakeup_fd = -1;
1125
1126         return 0;
1127
1128 error_add_stream:
1129         return ret;
1130 }
1131
1132 static
1133 int lttng_abi_create_event_enabler(int channel_objd,
1134                            struct lttng_ust_abi_event *event_param,
1135                            void *owner,
1136                            enum lttng_enabler_format_type format_type)
1137 {
1138         struct lttng_ust_channel_buffer *channel = objd_private(channel_objd);
1139         struct lttng_event_enabler *enabler;
1140         int event_objd, ret;
1141
1142         event_param->name[LTTNG_UST_ABI_SYM_NAME_LEN - 1] = '\0';
1143         event_objd = objd_alloc(NULL, &lttng_event_enabler_ops, owner,
1144                 "event enabler");
1145         if (event_objd < 0) {
1146                 ret = event_objd;
1147                 goto objd_error;
1148         }
1149         /*
1150          * We tolerate no failure path after event creation. It will stay
1151          * invariant for the rest of the session.
1152          */
1153         enabler = lttng_event_enabler_create(format_type, event_param, channel);
1154         if (!enabler) {
1155                 ret = -ENOMEM;
1156                 goto event_error;
1157         }
1158         objd_set_private(event_objd, enabler);
1159         /* The event holds a reference on the channel */
1160         objd_ref(channel_objd);
1161         return event_objd;
1162
1163 event_error:
1164         {
1165                 int err;
1166
1167                 err = lttng_ust_abi_objd_unref(event_objd, 1);
1168                 assert(!err);
1169         }
1170 objd_error:
1171         return ret;
1172 }
1173
1174 /**
1175  *      lttng_channel_cmd - lttng control through object descriptors
1176  *
1177  *      @objd: the object descriptor
1178  *      @cmd: the command
1179  *      @arg: command arg
1180  *      @uargs: UST arguments (internal)
1181  *      @owner: objd owner
1182  *
1183  *      This object descriptor implements lttng commands:
1184  *      LTTNG_UST_ABI_STREAM
1185  *              Returns an event stream object descriptor or failure.
1186  *              (typically, one event stream records events from one CPU)
1187  *      LTTNG_UST_ABI_EVENT
1188  *              Returns an event object descriptor or failure.
1189  *      LTTNG_UST_ABI_CONTEXT
1190  *              Prepend a context field to each event in the channel
1191  *      LTTNG_UST_ABI_ENABLE
1192  *              Enable recording for events in this channel (weak enable)
1193  *      LTTNG_UST_ABI_DISABLE
1194  *              Disable recording for events in this channel (strong disable)
1195  *
1196  * Channel and event file descriptors also hold a reference on the session.
1197  */
1198 static
1199 long lttng_channel_cmd(int objd, unsigned int cmd, unsigned long arg,
1200         union lttng_ust_abi_args *uargs, void *owner)
1201 {
1202         struct lttng_ust_channel_buffer *lttng_chan_buf = objd_private(objd);
1203
1204         if (cmd != LTTNG_UST_ABI_STREAM) {
1205                 /*
1206                  * Check if channel received all streams.
1207                  */
1208                 if (!lttng_is_channel_ready(lttng_chan_buf))
1209                         return -EPERM;
1210         }
1211
1212         switch (cmd) {
1213         case LTTNG_UST_ABI_STREAM:
1214         {
1215                 struct lttng_ust_abi_stream *stream;
1216
1217                 stream = (struct lttng_ust_abi_stream *) arg;
1218                 /* stream used as output */
1219                 return lttng_abi_map_stream(objd, stream, uargs, owner);
1220         }
1221         case LTTNG_UST_ABI_EVENT:
1222         {
1223                 struct lttng_ust_abi_event *event_param =
1224                         (struct lttng_ust_abi_event *) arg;
1225
1226                 if (strutils_is_star_glob_pattern(event_param->name)) {
1227                         /*
1228                          * If the event name is a star globbing pattern,
1229                          * we create the special star globbing enabler.
1230                          */
1231                         return lttng_abi_create_event_enabler(objd, event_param,
1232                                         owner, LTTNG_ENABLER_FORMAT_STAR_GLOB);
1233                 } else {
1234                         return lttng_abi_create_event_enabler(objd, event_param,
1235                                         owner, LTTNG_ENABLER_FORMAT_EVENT);
1236                 }
1237         }
1238         case LTTNG_UST_ABI_CONTEXT:
1239                 return lttng_abi_add_context(objd,
1240                                 (struct lttng_ust_abi_context *) arg, uargs,
1241                                 &lttng_chan_buf->priv->ctx,
1242                                 lttng_chan_buf->parent->session);
1243         case LTTNG_UST_ABI_ENABLE:
1244                 return lttng_channel_enable(lttng_chan_buf->parent);
1245         case LTTNG_UST_ABI_DISABLE:
1246                 return lttng_channel_disable(lttng_chan_buf->parent);
1247         case LTTNG_UST_ABI_FLUSH_BUFFER:
1248                 return lttng_chan_buf->ops->priv->flush_buffer(lttng_chan_buf->chan,
1249                                 lttng_chan_buf->handle);
1250         default:
1251                 return -EINVAL;
1252         }
1253 }
1254
1255 static
1256 int lttng_channel_release(int objd)
1257 {
1258         struct lttng_ust_channel_buffer *lttng_chan_buf = objd_private(objd);
1259
1260         if (lttng_chan_buf)
1261                 return lttng_ust_abi_objd_unref(lttng_chan_buf->parent->session->priv->objd, 0);
1262         return 0;
1263 }
1264
1265 static const struct lttng_ust_abi_objd_ops lttng_channel_ops = {
1266         .release = lttng_channel_release,
1267         .cmd = lttng_channel_cmd,
1268 };
1269
1270 /**
1271  *      lttng_enabler_cmd - lttng control through object descriptors
1272  *
1273  *      @objd: the object descriptor
1274  *      @cmd: the command
1275  *      @arg: command arg
1276  *      @uargs: UST arguments (internal)
1277  *      @owner: objd owner
1278  *
1279  *      This object descriptor implements lttng commands:
1280  *      LTTNG_UST_ABI_CONTEXT
1281  *              Prepend a context field to each record of events of this
1282  *              enabler.
1283  *      LTTNG_UST_ABI_ENABLE
1284  *              Enable recording for this enabler
1285  *      LTTNG_UST_ABI_DISABLE
1286  *              Disable recording for this enabler
1287  *      LTTNG_UST_ABI_FILTER
1288  *              Attach a filter to an enabler.
1289  *      LTTNG_UST_ABI_EXCLUSION
1290  *              Attach exclusions to an enabler.
1291  */
1292 static
1293 long lttng_event_enabler_cmd(int objd, unsigned int cmd, unsigned long arg,
1294         union lttng_ust_abi_args *uargs, void *owner)
1295 {
1296         struct lttng_event_enabler *enabler = objd_private(objd);
1297
1298         switch (cmd) {
1299         case LTTNG_UST_ABI_CONTEXT:
1300                 return lttng_event_enabler_attach_context(enabler,
1301                                 (struct lttng_ust_abi_context *) arg);
1302         case LTTNG_UST_ABI_ENABLE:
1303                 return lttng_event_enabler_enable(enabler);
1304         case LTTNG_UST_ABI_DISABLE:
1305                 return lttng_event_enabler_disable(enabler);
1306         case LTTNG_UST_ABI_FILTER:
1307         {
1308                 int ret;
1309
1310                 ret = lttng_event_enabler_attach_filter_bytecode(enabler,
1311                                 (struct lttng_ust_bytecode_node **) arg);
1312                 if (ret)
1313                         return ret;
1314                 return 0;
1315         }
1316         case LTTNG_UST_ABI_EXCLUSION:
1317         {
1318                 return lttng_event_enabler_attach_exclusion(enabler,
1319                                 (struct lttng_ust_excluder_node **) arg);
1320         }
1321         default:
1322                 return -EINVAL;
1323         }
1324 }
1325
1326 static
1327 int lttng_event_enabler_release(int objd)
1328 {
1329         struct lttng_event_enabler *event_enabler = objd_private(objd);
1330
1331         if (event_enabler)
1332                 return lttng_ust_abi_objd_unref(event_enabler->chan->priv->parent.objd, 0);
1333
1334         return 0;
1335 }
1336
1337 static const struct lttng_ust_abi_objd_ops lttng_event_enabler_ops = {
1338         .release = lttng_event_enabler_release,
1339         .cmd = lttng_event_enabler_cmd,
1340 };
1341
1342 void lttng_ust_abi_exit(void)
1343 {
1344         lttng_ust_abi_close_in_progress = 1;
1345         ust_lock_nocheck();
1346         objd_table_destroy();
1347         ust_unlock();
1348         lttng_ust_abi_close_in_progress = 0;
1349 }