src/bin/lttng-sessiond/trace-ust.c

   1 /*
   2  * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca>
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License, version 2 only,
   6  * as published by the Free Software Foundation.
   7  *
   8  * This program is distributed in the hope that it will be useful,
   9  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  11  * GNU General Public License for more details.
  12  *
  13  * You should have received a copy of the GNU General Public License along
  14  * with this program; if not, write to the Free Software Foundation, Inc.,
  15  * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  16  */
  17
  18 #define _GNU_SOURCE
  19 #include <stdio.h>
  20 #include <stdlib.h>
  21 #include <string.h>
  22 #include <unistd.h>
  23 #include <inttypes.h>
  24
  25 #include <common/common.h>
  26 #include <common/defaults.h>
  27
  28 #include "buffer-registry.h"
  29 #include "trace-ust.h"
  30 #include "utils.h"
  31
  32 /*
  33  * Match function for the events hash table lookup.
  34  *
  35  * Matches by name only. Used by the disable command.
  36  */
  37 int trace_ust_ht_match_event_by_name(struct cds_lfht_node *node,
  38                 const void *_key)
  39 {
  40         struct ltt_ust_event *event;
  41         const char *name;
  42
  43         assert(node);
  44         assert(_key);
  45
  46         event = caa_container_of(node, struct ltt_ust_event, node.node);
  47         name = _key;
  48
  49         /* Event name */
  50         if (strncmp(event->attr.name, name, sizeof(event->attr.name)) != 0) {
  51                 goto no_match;
  52         }
  53
  54         /* Match */
  55         return 1;
  56
  57 no_match:
  58         return 0;
  59 }
  60
  61 /*
  62  * Match function for the hash table lookup.
  63  *
  64  * It matches an ust event based on three attributes which are the event name,
  65  * the filter bytecode and the loglevel.
  66  */
  67 int trace_ust_ht_match_event(struct cds_lfht_node *node, const void *_key)
  68 {
  69         struct ltt_ust_event *event;
  70         const struct ltt_ust_ht_key *key;
  71
  72         assert(node);
  73         assert(_key);
  74
  75         event = caa_container_of(node, struct ltt_ust_event, node.node);
  76         key = _key;
  77
  78         /* Match the 4 elements of the key: name, filter, loglevel, exclusions. */
  79
  80         /* Event name */
  81         if (strncmp(event->attr.name, key->name, sizeof(event->attr.name)) != 0) {
  82                 goto no_match;
  83         }
  84
  85         /* Event loglevel. */
  86         if (event->attr.loglevel != key->loglevel) {
  87                 if (event->attr.loglevel_type == LTTNG_UST_LOGLEVEL_ALL
  88                                 && key->loglevel == 0 && event->attr.loglevel == -1) {
  89                         /*
  90                          * Match is accepted. This is because on event creation, the
  91                          * loglevel is set to -1 if the event loglevel type is ALL so 0 and
  92                          * -1 are accepted for this loglevel type since 0 is the one set by
  93                          * the API when receiving an enable event.
  94                          */
  95                 } else {
  96                         goto no_match;
  97                 }
  98         }
  99
 100         /* Only one of the filters is NULL, fail. */
 101         if ((key->filter && !event->filter) || (!key->filter && event->filter)) {
 102                 goto no_match;
 103         }
 104
 105         if (key->filter && event->filter) {
 106                 /* Both filters exists, check length followed by the bytecode. */
 107                 if (event->filter->len != key->filter->len ||
 108                                 memcmp(event->filter->data, key->filter->data,
 109                                         event->filter->len) != 0) {
 110                         goto no_match;
 111                 }
 112         }
 113
 114         /* If only one of the exclusions is NULL, fail. */
 115         if ((key->exclusion && !event->exclusion) || (!key->exclusion && event->exclusion)) {
 116                 goto no_match;
 117         }
 118
 119         if (key->exclusion && event->exclusion) {
 120                 /* Both exclusions exist; check count followed by names. */
 121                 if (event->exclusion->count != key->exclusion->count ||
 122                                 memcmp(event->exclusion->names, key->exclusion->names,
 123                                         event->exclusion->count * LTTNG_SYMBOL_NAME_LEN) != 0) {
 124                         goto no_match;
 125                 }
 126         }
 127         /* Match. */
 128         return 1;
 129
 130 no_match:
 131         return 0;
 132 }
 133
 134 /*
 135  * Find the channel in the hashtable and return channel pointer. RCU read side
 136  * lock MUST be acquired before calling this.
 137  */
 138 struct ltt_ust_channel *trace_ust_find_channel_by_name(struct lttng_ht *ht,
 139                 char *name)
 140 {
 141         struct lttng_ht_node_str *node;
 142         struct lttng_ht_iter iter;
 143
 144         /*
 145          * If we receive an empty string for channel name, it means the
 146          * default channel name is requested.
 147          */
 148         if (name[0] == '\0')
 149                 name = DEFAULT_CHANNEL_NAME;
 150
 151         lttng_ht_lookup(ht, (void *)name, &iter);
 152         node = lttng_ht_iter_get_node_str(&iter);
 153         if (node == NULL) {
 154                 goto error;
 155         }
 156
 157         DBG2("Trace UST channel %s found by name", name);
 158
 159         return caa_container_of(node, struct ltt_ust_channel, node);
 160
 161 error:
 162         DBG2("Trace UST channel %s not found by name", name);
 163         return NULL;
 164 }
 165
 166 /*
 167  * Find the event in the hashtable and return event pointer. RCU read side lock
 168  * MUST be acquired before calling this.
 169  */
 170 struct ltt_ust_event *trace_ust_find_event(struct lttng_ht *ht,
 171                 char *name, struct lttng_filter_bytecode *filter, int loglevel)
 172 {
 173         struct lttng_ht_node_str *node;
 174         struct lttng_ht_iter iter;
 175         struct ltt_ust_ht_key key;
 176
 177         assert(name);
 178         assert(ht);
 179
 180         key.name = name;
 181         key.filter = filter;
 182         key.loglevel = loglevel;
 183
 184         cds_lfht_lookup(ht->ht, ht->hash_fct((void *) name, lttng_ht_seed),
 185                         trace_ust_ht_match_event, &key, &iter.iter);
 186         node = lttng_ht_iter_get_node_str(&iter);
 187         if (node == NULL) {
 188                 goto error;
 189         }
 190
 191         DBG2("Trace UST event %s found", key.name);
 192
 193         return caa_container_of(node, struct ltt_ust_event, node);
 194
 195 error:
 196         DBG2("Trace UST event %s NOT found", key.name);
 197         return NULL;
 198 }
 199
 200 /*
 201  * Allocate and initialize a ust session data structure.
 202  *
 203  * Return pointer to structure or NULL.
 204  */
 205 struct ltt_ust_session *trace_ust_create_session(uint64_t session_id)
 206 {
 207         int ret;
 208         struct ltt_ust_session *lus;
 209
 210         /* Allocate a new ltt ust session */
 211         lus = zmalloc(sizeof(struct ltt_ust_session));
 212         if (lus == NULL) {
 213                 PERROR("create ust session zmalloc");
 214                 goto error;
 215         }
 216
 217         /* Init data structure */
 218         lus->id = session_id;
 219         lus->start_trace = 0;
 220
 221         /*
 222          * Default buffer type. This can be changed through an enable channel
 223          * requesting a different type. Note that this can only be changed once
 224          * during the session lifetime which is at the first enable channel and
 225          * only before start. The flag buffer_type_changed indicates the status.
 226          */
 227         lus->buffer_type = LTTNG_BUFFER_PER_UID;
 228         /* Once set to 1, the buffer_type is immutable for the session. */
 229         lus->buffer_type_changed = 0;
 230         /* Init it in case it get used after allocation. */
 231         CDS_INIT_LIST_HEAD(&lus->buffer_reg_uid_list);
 232
 233         /* Alloc UST global domain channels' HT */
 234         lus->domain_global.channels = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
 235         ret = jul_init_domain(&lus->domain_jul);
 236         if (ret < 0) {
 237                 goto error_consumer;
 238         }
 239
 240         lus->consumer = consumer_create_output(CONSUMER_DST_LOCAL);
 241         if (lus->consumer == NULL) {
 242                 goto error_consumer;
 243         }
 244
 245         /*
 246          * The tmp_consumer stays NULL until a set_consumer_uri command is
 247          * executed. At this point, the consumer should be nullify until an
 248          * enable_consumer command. This assignment is symbolic since we've zmalloc
 249          * the struct.
 250          */
 251         lus->tmp_consumer = NULL;
 252
 253         DBG2("UST trace session create successful");
 254
 255         return lus;
 256
 257 error_consumer:
 258         ht_cleanup_push(lus->domain_global.channels);
 259         jul_destroy_domain(&lus->domain_jul);
 260         free(lus);
 261 error:
 262         return NULL;
 263 }
 264
 265 /*
 266  * Allocate and initialize a ust channel data structure.
 267  *
 268  * Return pointer to structure or NULL.
 269  */
 270 struct ltt_ust_channel *trace_ust_create_channel(struct lttng_channel *chan)
 271 {
 272         struct ltt_ust_channel *luc;
 273
 274         assert(chan);
 275
 276         luc = zmalloc(sizeof(struct ltt_ust_channel));
 277         if (luc == NULL) {
 278                 PERROR("ltt_ust_channel zmalloc");
 279                 goto error;
 280         }
 281
 282         /* Copy UST channel attributes */
 283         luc->attr.overwrite = chan->attr.overwrite;
 284         luc->attr.subbuf_size = chan->attr.subbuf_size;
 285         luc->attr.num_subbuf = chan->attr.num_subbuf;
 286         luc->attr.switch_timer_interval = chan->attr.switch_timer_interval;
 287         luc->attr.read_timer_interval = chan->attr.read_timer_interval;
 288         luc->attr.output = (enum lttng_ust_output) chan->attr.output;
 289
 290         /* Translate to UST output enum */
 291         switch (luc->attr.output) {
 292         default:
 293                 luc->attr.output = LTTNG_UST_MMAP;
 294                 break;
 295         }
 296
 297         /*
 298          * If we receive an empty string for channel name, it means the
 299          * default channel name is requested.
 300          */
 301         if (chan->name[0] == '\0') {
 302                 strncpy(luc->name, DEFAULT_CHANNEL_NAME, sizeof(luc->name));
 303         } else {
 304                 /* Copy channel name */
 305                 strncpy(luc->name, chan->name, sizeof(luc->name));
 306         }
 307         luc->name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
 308
 309         /* Init node */
 310         lttng_ht_node_init_str(&luc->node, luc->name);
 311         CDS_INIT_LIST_HEAD(&luc->ctx_list);
 312
 313         /* Alloc hash tables */
 314         luc->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING);
 315         luc->ctx = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG);
 316
 317         /* On-disk circular buffer parameters */
 318         luc->tracefile_size = chan->attr.tracefile_size;
 319         luc->tracefile_count = chan->attr.tracefile_count;
 320
 321         DBG2("Trace UST channel %s created", luc->name);
 322
 323 error:
 324         return luc;
 325 }
 326
 327 /*
 328  * Allocate and initialize a ust event. Set name and event type.
 329  *
 330  * Return pointer to structure or NULL.
 331  */
 332 struct ltt_ust_event *trace_ust_create_event(struct lttng_event *ev,
 333                 struct lttng_filter_bytecode *filter,
 334                 struct lttng_event_exclusion *exclusion)
 335 {
 336         struct ltt_ust_event *lue;
 337
 338         assert(ev);
 339
 340         lue = zmalloc(sizeof(struct ltt_ust_event));
 341         if (lue == NULL) {
 342                 PERROR("ust event zmalloc");
 343                 goto error;
 344         }
 345
 346         switch (ev->type) {
 347         case LTTNG_EVENT_PROBE:
 348                 lue->attr.instrumentation = LTTNG_UST_PROBE;
 349                 break;
 350         case LTTNG_EVENT_FUNCTION:
 351                 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
 352                 break;
 353         case LTTNG_EVENT_FUNCTION_ENTRY:
 354                 lue->attr.instrumentation = LTTNG_UST_FUNCTION;
 355                 break;
 356         case LTTNG_EVENT_TRACEPOINT:
 357                 lue->attr.instrumentation = LTTNG_UST_TRACEPOINT;
 358                 break;
 359         default:
 360                 ERR("Unknown ust instrumentation type (%d)", ev->type);
 361                 goto error_free_event;
 362         }
 363
 364         /* Copy event name */
 365         strncpy(lue->attr.name, ev->name, LTTNG_UST_SYM_NAME_LEN);
 366         lue->attr.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0';
 367
 368         switch (ev->loglevel_type) {
 369         case LTTNG_EVENT_LOGLEVEL_ALL:
 370                 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_ALL;
 371                 lue->attr.loglevel = -1;        /* Force to -1 */
 372                 break;
 373         case LTTNG_EVENT_LOGLEVEL_RANGE:
 374                 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_RANGE;
 375                 lue->attr.loglevel = ev->loglevel;
 376                 break;
 377         case LTTNG_EVENT_LOGLEVEL_SINGLE:
 378                 lue->attr.loglevel_type = LTTNG_UST_LOGLEVEL_SINGLE;
 379                 lue->attr.loglevel = ev->loglevel;
 380                 break;
 381         default:
 382                 ERR("Unknown ust loglevel type (%d)", ev->loglevel_type);
 383                 goto error_free_event;
 384         }
 385
 386         /* Same layout. */
 387         lue->filter = (struct lttng_ust_filter_bytecode *) filter;
 388         lue->exclusion = (struct lttng_event_exclusion *) exclusion;
 389
 390         /* Init node */
 391         lttng_ht_node_init_str(&lue->node, lue->attr.name);
 392
 393         DBG2("Trace UST event %s, loglevel (%d,%d) created",
 394                 lue->attr.name, lue->attr.loglevel_type,
 395                 lue->attr.loglevel);
 396
 397         return lue;
 398
 399 error_free_event:
 400         free(lue);
 401 error:
 402         return NULL;
 403 }
 404
 405 /*
 406  * Allocate and initialize a ust metadata.
 407  *
 408  * Return pointer to structure or NULL.
 409  */
 410 struct ltt_ust_metadata *trace_ust_create_metadata(char *path)
 411 {
 412         int ret;
 413         struct ltt_ust_metadata *lum;
 414
 415         assert(path);
 416
 417         lum = zmalloc(sizeof(struct ltt_ust_metadata));
 418         if (lum == NULL) {
 419                 PERROR("ust metadata zmalloc");
 420                 goto error;
 421         }
 422
 423         /* Set default attributes */
 424         lum->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE;
 425         lum->attr.subbuf_size = default_get_metadata_subbuf_size();
 426         lum->attr.num_subbuf = DEFAULT_METADATA_SUBBUF_NUM;
 427         lum->attr.switch_timer_interval = DEFAULT_METADATA_SWITCH_TIMER;
 428         lum->attr.read_timer_interval = DEFAULT_METADATA_READ_TIMER;
 429         lum->attr.output = LTTNG_UST_MMAP;
 430
 431         lum->handle = -1;
 432         /* Set metadata trace path */
 433         ret = snprintf(lum->pathname, PATH_MAX, "%s/" DEFAULT_METADATA_NAME, path);
 434         if (ret < 0) {
 435                 PERROR("asprintf ust metadata");
 436                 goto error_free_metadata;
 437         }
 438
 439         return lum;
 440
 441 error_free_metadata:
 442         free(lum);
 443 error:
 444         return NULL;
 445 }
 446
 447 /*
 448  * Allocate and initialize an UST context.
 449  *
 450  * Return pointer to structure or NULL.
 451  */
 452 struct ltt_ust_context *trace_ust_create_context(
 453                 struct lttng_event_context *ctx)
 454 {
 455         struct ltt_ust_context *uctx;
 456         enum lttng_ust_context_type utype;
 457
 458         assert(ctx);
 459
 460         switch (ctx->ctx) {
 461         case LTTNG_EVENT_CONTEXT_VTID:
 462                 utype = LTTNG_UST_CONTEXT_VTID;
 463                 break;
 464         case LTTNG_EVENT_CONTEXT_VPID:
 465                 utype = LTTNG_UST_CONTEXT_VPID;
 466                 break;
 467         case LTTNG_EVENT_CONTEXT_PTHREAD_ID:
 468                 utype = LTTNG_UST_CONTEXT_PTHREAD_ID;
 469                 break;
 470         case LTTNG_EVENT_CONTEXT_PROCNAME:
 471                 utype = LTTNG_UST_CONTEXT_PROCNAME;
 472                 break;
 473         case LTTNG_EVENT_CONTEXT_IP:
 474                 utype = LTTNG_UST_CONTEXT_IP;
 475                 break;
 476         default:
 477                 ERR("Invalid UST context");
 478                 return NULL;
 479         }
 480
 481         uctx = zmalloc(sizeof(struct ltt_ust_context));
 482         if (uctx == NULL) {
 483                 PERROR("zmalloc ltt_ust_context");
 484                 goto error;
 485         }
 486
 487         uctx->ctx.ctx = utype;
 488         lttng_ht_node_init_ulong(&uctx->node, (unsigned long) uctx->ctx.ctx);
 489         CDS_INIT_LIST_HEAD(&uctx->list);
 490
 491         return uctx;
 492
 493 error:
 494         return NULL;
 495 }
 496
 497 /*
 498  * RCU safe free context structure.
 499  */
 500 static void destroy_context_rcu(struct rcu_head *head)
 501 {
 502         struct lttng_ht_node_ulong *node =
 503                 caa_container_of(head, struct lttng_ht_node_ulong, head);
 504         struct ltt_ust_context *ctx =
 505                 caa_container_of(node, struct ltt_ust_context, node);
 506
 507         free(ctx);
 508 }
 509
 510 /*
 511  * Cleanup UST context hash table.
 512  */
 513 static void destroy_contexts(struct lttng_ht *ht)
 514 {
 515         int ret;
 516         struct lttng_ht_node_ulong *node;
 517         struct lttng_ht_iter iter;
 518         struct ltt_ust_context *ctx;
 519
 520         assert(ht);
 521
 522         rcu_read_lock();
 523         cds_lfht_for_each_entry(ht->ht, &iter.iter, node, node) {
 524                 /* Remove from ordered list. */
 525                 ctx = caa_container_of(node, struct ltt_ust_context, node);
 526                 cds_list_del(&ctx->list);
 527                 /* Remove from channel's hash table. */
 528                 ret = lttng_ht_del(ht, &iter);
 529                 if (!ret) {
 530                         call_rcu(&node->head, destroy_context_rcu);
 531                 }
 532         }
 533         rcu_read_unlock();
 534
 535         ht_cleanup_push(ht);
 536 }
 537
 538 /*
 539  * Cleanup ust event structure.
 540  */
 541 void trace_ust_destroy_event(struct ltt_ust_event *event)
 542 {
 543         assert(event);
 544
 545         DBG2("Trace destroy UST event %s", event->attr.name);
 546         free(event->filter);
 547         free(event);
 548 }
 549
 550 /*
 551  * URCU intermediate call to complete destroy event.
 552  */
 553 static void destroy_event_rcu(struct rcu_head *head)
 554 {
 555         struct lttng_ht_node_str *node =
 556                 caa_container_of(head, struct lttng_ht_node_str, head);
 557         struct ltt_ust_event *event =
 558                 caa_container_of(node, struct ltt_ust_event, node);
 559
 560         trace_ust_destroy_event(event);
 561 }
 562
 563 /*
 564  * Cleanup UST events hashtable.
 565  */
 566 static void destroy_events(struct lttng_ht *events)
 567 {
 568         int ret;
 569         struct lttng_ht_node_str *node;
 570         struct lttng_ht_iter iter;
 571
 572         assert(events);
 573
 574         rcu_read_lock();
 575         cds_lfht_for_each_entry(events->ht, &iter.iter, node, node) {
 576                 ret = lttng_ht_del(events, &iter);
 577                 assert(!ret);
 578                 call_rcu(&node->head, destroy_event_rcu);
 579         }
 580         rcu_read_unlock();
 581
 582         ht_cleanup_push(events);
 583 }
 584
 585 /*
 586  * Cleanup ust channel structure.
 587  *
 588  * Should _NOT_ be called with RCU read lock held.
 589  */
 590 static void _trace_ust_destroy_channel(struct ltt_ust_channel *channel)
 591 {
 592         assert(channel);
 593
 594         DBG2("Trace destroy UST channel %s", channel->name);
 595
 596         /* Destroying all events of the channel */
 597         destroy_events(channel->events);
 598         /* Destroying all context of the channel */
 599         destroy_contexts(channel->ctx);
 600
 601         free(channel);
 602 }
 603
 604 /*
 605  * URCU intermediate call to complete destroy channel.
 606  */
 607 static void destroy_channel_rcu(struct rcu_head *head)
 608 {
 609         struct lttng_ht_node_str *node =
 610                 caa_container_of(head, struct lttng_ht_node_str, head);
 611         struct ltt_ust_channel *channel =
 612                 caa_container_of(node, struct ltt_ust_channel, node);
 613
 614         _trace_ust_destroy_channel(channel);
 615 }
 616
 617 void trace_ust_destroy_channel(struct ltt_ust_channel *channel)
 618 {
 619         call_rcu(&channel->node.head, destroy_channel_rcu);
 620 }
 621
 622 /*
 623  * Remove an UST channel from a channel HT.
 624  */
 625 void trace_ust_delete_channel(struct lttng_ht *ht,
 626                 struct ltt_ust_channel *channel)
 627 {
 628         int ret;
 629         struct lttng_ht_iter iter;
 630
 631         assert(ht);
 632         assert(channel);
 633
 634         iter.iter.node = &channel->node.node;
 635         ret = lttng_ht_del(ht, &iter);
 636         assert(!ret);
 637 }
 638
 639 /*
 640  * Cleanup ust metadata structure.
 641  */
 642 void trace_ust_destroy_metadata(struct ltt_ust_metadata *metadata)
 643 {
 644         assert(metadata);
 645
 646         if (!metadata->handle) {
 647                 return;
 648         }
 649         DBG2("Trace UST destroy metadata %d", metadata->handle);
 650         free(metadata);
 651 }
 652
 653 /*
 654  * Iterate over a hash table containing channels and cleanup safely.
 655  */
 656 static void destroy_channels(struct lttng_ht *channels)
 657 {
 658         int ret;
 659         struct lttng_ht_node_str *node;
 660         struct lttng_ht_iter iter;
 661
 662         assert(channels);
 663
 664         rcu_read_lock();
 665
 666         cds_lfht_for_each_entry(channels->ht, &iter.iter, node, node) {
 667                 ret = lttng_ht_del(channels, &iter);
 668                 assert(!ret);
 669                 call_rcu(&node->head, destroy_channel_rcu);
 670         }
 671         rcu_read_unlock();
 672
 673         ht_cleanup_push(channels);
 674 }
 675
 676 /*
 677  * Cleanup UST global domain.
 678  */
 679 static void destroy_domain_global(struct ltt_ust_domain_global *dom)
 680 {
 681         assert(dom);
 682
 683         destroy_channels(dom->channels);
 684 }
 685
 686 /*
 687  * Cleanup ust session structure
 688  *
 689  * Should *NOT* be called with RCU read-side lock held.
 690  */
 691 void trace_ust_destroy_session(struct ltt_ust_session *session)
 692 {
 693         struct buffer_reg_uid *reg, *sreg;
 694
 695         assert(session);
 696
 697         DBG2("Trace UST destroy session %" PRIu64, session->id);
 698
 699         /* Cleaning up UST domain */
 700         destroy_domain_global(&session->domain_global);
 701         jul_destroy_domain(&session->domain_jul);
 702
 703         /* Cleanup UID buffer registry object(s). */
 704         cds_list_for_each_entry_safe(reg, sreg, &session->buffer_reg_uid_list,
 705                         lnode) {
 706                 cds_list_del(&reg->lnode);
 707                 buffer_reg_uid_remove(reg);
 708                 buffer_reg_uid_destroy(reg, session->consumer);
 709         }
 710
 711         consumer_destroy_output(session->consumer);
 712         consumer_destroy_output(session->tmp_consumer);
 713
 714         free(session);
 715 }