lttng-sessiond/ust-app.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
   5  * modify it under the terms of the GNU General Public License
   6  * as published by the Free Software Foundation; only version 2
   7  * of the License.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
  17  */
  18
  19 #define _GNU_SOURCE
  20 #include <errno.h>
  21 #include <pthread.h>
  22 #include <stdio.h>
  23 #include <stdlib.h>
  24 #include <string.h>
  25 #include <sys/stat.h>
  26 #include <sys/types.h>
  27 #include <unistd.h>
  28 #include <runas.h>
  29
  30 #include <urcu/compiler.h>
  31 #include <lttngerr.h>
  32 #include <lttng-share.h>
  33 #include <runas.h>
  34
  35 #include "hashtable.h"
  36 #include "ust-app.h"
  37 #include "ust-consumer.h"
  38 #include "ust-ctl.h"
  39
  40 /*
  41  * Delete ust context safely. RCU read lock must be held before calling
  42  * this function.
  43  */
  44 static
  45 void delete_ust_app_ctx(int sock, struct ust_app_ctx *ua_ctx)
  46 {
  47         if (ua_ctx->obj) {
  48                 ustctl_release_object(sock, ua_ctx->obj);
  49                 free(ua_ctx->obj);
  50         }
  51         free(ua_ctx);
  52 }
  53
  54 /*
  55  * Delete ust app event safely. RCU read lock must be held before calling
  56  * this function.
  57  */
  58 static
  59 void delete_ust_app_event(int sock, struct ust_app_event *ua_event)
  60 {
  61         int ret;
  62         struct cds_lfht_iter iter;
  63         struct ust_app_ctx *ua_ctx;
  64
  65         cds_lfht_for_each_entry(ua_event->ctx, &iter, ua_ctx, node) {
  66                 ret = hashtable_del(ua_event->ctx, &iter);
  67                 assert(!ret);
  68                 delete_ust_app_ctx(sock, ua_ctx);
  69         }
  70         ret = hashtable_destroy(ua_event->ctx);
  71         assert(!ret);
  72
  73         if (ua_event->obj != NULL) {
  74                 ustctl_release_object(sock, ua_event->obj);
  75                 free(ua_event->obj);
  76         }
  77         free(ua_event);
  78 }
  79
  80 /*
  81  * Delete ust app stream safely. RCU read lock must be held before calling
  82  * this function.
  83  */
  84 static
  85 void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream)
  86 {
  87         if (stream->obj) {
  88                 ustctl_release_object(sock, stream->obj);
  89                 free(stream->obj);
  90         }
  91         free(stream);
  92 }
  93
  94 /*
  95  * Delete ust app channel safely. RCU read lock must be held before calling
  96  * this function.
  97  */
  98 static
  99 void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan)
 100 {
 101         int ret;
 102         struct cds_lfht_iter iter;
 103         struct ust_app_event *ua_event;
 104         struct ust_app_ctx *ua_ctx;
 105         struct ltt_ust_stream *stream, *stmp;
 106
 107         /* Wipe stream */
 108         cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) {
 109                 cds_list_del(&stream->list);
 110                 delete_ust_app_stream(sock, stream);
 111         }
 112
 113         /* Wipe context */
 114         cds_lfht_for_each_entry(ua_chan->ctx, &iter, ua_ctx, node) {
 115                 ret = hashtable_del(ua_chan->ctx, &iter);
 116                 assert(!ret);
 117                 delete_ust_app_ctx(sock, ua_ctx);
 118         }
 119         ret = hashtable_destroy(ua_chan->ctx);
 120         assert(!ret);
 121
 122         /* Wipe events */
 123         cds_lfht_for_each_entry(ua_chan->events, &iter, ua_event, node) {
 124                 ret = hashtable_del(ua_chan->events, &iter);
 125                 assert(!ret);
 126                 delete_ust_app_event(sock, ua_event);
 127         }
 128         ret = hashtable_destroy(ua_chan->events);
 129         assert(!ret);
 130
 131         if (ua_chan->obj != NULL) {
 132                 ustctl_release_object(sock, ua_chan->obj);
 133                 free(ua_chan->obj);
 134         }
 135         free(ua_chan);
 136 }
 137
 138 /*
 139  * Delete ust app session safely. RCU read lock must be held before calling
 140  * this function.
 141  */
 142 static
 143 void delete_ust_app_session(int sock, struct ust_app_session *ua_sess)
 144 {
 145         int ret;
 146         struct cds_lfht_iter iter;
 147         struct ust_app_channel *ua_chan;
 148
 149         if (ua_sess->metadata) {
 150                 if (ua_sess->metadata->stream_obj) {
 151                         ustctl_release_object(sock, ua_sess->metadata->stream_obj);
 152                         free(ua_sess->metadata->stream_obj);
 153                 }
 154                 if (ua_sess->metadata->obj) {
 155                         ustctl_release_object(sock, ua_sess->metadata->obj);
 156                         free(ua_sess->metadata->obj);
 157                 }
 158         }
 159
 160         cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
 161                 ret = hashtable_del(ua_sess->channels, &iter);
 162                 assert(!ret);
 163                 delete_ust_app_channel(sock, ua_chan);
 164         }
 165         ret = hashtable_destroy(ua_sess->channels);
 166         assert(!ret);
 167
 168         if (ua_sess->handle != -1) {
 169                 ustctl_release_handle(sock, ua_sess->handle);
 170         }
 171         free(ua_sess);
 172 }
 173
 174 /*
 175  * Delete a traceable application structure from the global list. Never call
 176  * this function outside of a call_rcu call.
 177  */
 178 static
 179 void delete_ust_app(struct ust_app *app)
 180 {
 181         int ret, sock;
 182         struct cds_lfht_node *node;
 183         struct cds_lfht_iter iter;
 184         struct ust_app_session *ua_sess;
 185
 186         rcu_read_lock();
 187
 188         /* Remove from key hash table */
 189         node = hashtable_lookup(ust_app_sock_key_map,
 190                         (void *) ((unsigned long) app->key.sock), sizeof(void *), &iter);
 191         if (node == NULL) {
 192                 /* Not suppose to happen */
 193                 ERR("UST app key %d not found in key hash table", app->key.sock);
 194                 goto end;
 195         }
 196
 197         ret = hashtable_del(ust_app_sock_key_map, &iter);
 198         if (ret) {
 199                 ERR("UST app unable to delete app sock %d from key hash table",
 200                                 app->key.sock);
 201         } else {
 202                 DBG2("UST app pair sock %d key %d deleted",
 203                                 app->key.sock, app->key.pid);
 204         }
 205
 206         /* Socket is already closed at this point */
 207
 208         /* Delete ust app sessions info */
 209         sock = app->key.sock;
 210         app->key.sock = -1;
 211
 212         /* Wipe sessions */
 213         cds_lfht_for_each_entry(app->sessions, &iter, ua_sess, node) {
 214                 ret = hashtable_del(app->sessions, &iter);
 215                 assert(!ret);
 216                 delete_ust_app_session(app->key.sock, ua_sess);
 217         }
 218         ret = hashtable_destroy(app->sessions);
 219         assert(!ret);
 220
 221         /*
 222          * Wait until we have removed the key from the sock hash table
 223          * before closing this socket, otherwise an application could
 224          * re-use the socket ID and race with the teardown, using the
 225          * same hash table entry.
 226          */
 227         close(sock);
 228
 229         DBG2("UST app pid %d deleted", app->key.pid);
 230         free(app);
 231 end:
 232         rcu_read_unlock();
 233 }
 234
 235 /*
 236  * URCU intermediate call to delete an UST app.
 237  */
 238 static
 239 void delete_ust_app_rcu(struct rcu_head *head)
 240 {
 241         struct cds_lfht_node *node =
 242                 caa_container_of(head, struct cds_lfht_node, head);
 243         struct ust_app *app =
 244                 caa_container_of(node, struct ust_app, node);
 245
 246         delete_ust_app(app);
 247 }
 248
 249 /*
 250  * Alloc new UST app session.
 251  */
 252 static
 253 struct ust_app_session *alloc_ust_app_session(void)
 254 {
 255         struct ust_app_session *ua_sess;
 256
 257         /* Init most of the default value by allocating and zeroing */
 258         ua_sess = zmalloc(sizeof(struct ust_app_session));
 259         if (ua_sess == NULL) {
 260                 PERROR("malloc");
 261                 goto error;
 262         }
 263
 264         ua_sess->handle = -1;
 265         ua_sess->channels = hashtable_new_str(0);
 266
 267         return ua_sess;
 268
 269 error:
 270         return NULL;
 271 }
 272
 273 /*
 274  * Alloc new UST app channel.
 275  */
 276 static
 277 struct ust_app_channel *alloc_ust_app_channel(char *name,
 278                 struct lttng_ust_channel *attr)
 279 {
 280         struct ust_app_channel *ua_chan;
 281
 282         /* Init most of the default value by allocating and zeroing */
 283         ua_chan = zmalloc(sizeof(struct ust_app_channel));
 284         if (ua_chan == NULL) {
 285                 PERROR("malloc");
 286                 goto error;
 287         }
 288
 289         /* Setup channel name */
 290         strncpy(ua_chan->name, name, sizeof(ua_chan->name));
 291         ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
 292
 293         ua_chan->enabled = 1;
 294         ua_chan->handle = -1;
 295         ua_chan->ctx = hashtable_new(0);
 296         ua_chan->events = hashtable_new_str(0);
 297         hashtable_node_init(&ua_chan->node, (void *) ua_chan->name,
 298                         strlen(ua_chan->name));
 299
 300         CDS_INIT_LIST_HEAD(&ua_chan->streams.head);
 301
 302         /* Copy attributes */
 303         if (attr) {
 304                 memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr));
 305         }
 306
 307         DBG3("UST app channel %s allocated", ua_chan->name);
 308
 309         return ua_chan;
 310
 311 error:
 312         return NULL;
 313 }
 314
 315 /*
 316  * Alloc new UST app event.
 317  */
 318 static
 319 struct ust_app_event *alloc_ust_app_event(char *name,
 320                 struct lttng_ust_event *attr)
 321 {
 322         struct ust_app_event *ua_event;
 323
 324         /* Init most of the default value by allocating and zeroing */
 325         ua_event = zmalloc(sizeof(struct ust_app_event));
 326         if (ua_event == NULL) {
 327                 PERROR("malloc");
 328                 goto error;
 329         }
 330
 331         ua_event->enabled = 1;
 332         strncpy(ua_event->name, name, sizeof(ua_event->name));
 333         ua_event->name[sizeof(ua_event->name) - 1] = '\0';
 334         ua_event->ctx = hashtable_new(0);
 335         hashtable_node_init(&ua_event->node, (void *) ua_event->name,
 336                         strlen(ua_event->name));
 337
 338         /* Copy attributes */
 339         if (attr) {
 340                 memcpy(&ua_event->attr, attr, sizeof(ua_event->attr));
 341         }
 342
 343         DBG3("UST app event %s allocated", ua_event->name);
 344
 345         return ua_event;
 346
 347 error:
 348         return NULL;
 349 }
 350
 351 /*
 352  * Alloc new UST app context.
 353  */
 354 static
 355 struct ust_app_ctx *alloc_ust_app_ctx(struct lttng_ust_context *uctx)
 356 {
 357         struct ust_app_ctx *ua_ctx;
 358
 359         ua_ctx = zmalloc(sizeof(struct ust_app_ctx));
 360         if (ua_ctx == NULL) {
 361                 goto error;
 362         }
 363
 364         if (uctx) {
 365                 memcpy(&ua_ctx->ctx, uctx, sizeof(ua_ctx->ctx));
 366         }
 367
 368         DBG3("UST app context %d allocated", ua_ctx->ctx.ctx);
 369
 370 error:
 371         return ua_ctx;
 372 }
 373
 374 /*
 375  * Find an ust_app using the sock and return it. RCU read side lock must be
 376  * held before calling this helper function.
 377  */
 378 static
 379 struct ust_app *find_app_by_sock(int sock)
 380 {
 381         struct cds_lfht_node *node;
 382         struct ust_app_key *key;
 383         struct cds_lfht_iter iter;
 384
 385         node = hashtable_lookup(ust_app_sock_key_map,
 386                         (void *)((unsigned long) sock), sizeof(void *), &iter);
 387         if (node == NULL) {
 388                 DBG2("UST app find by sock %d key not found", sock);
 389                 goto error;
 390         }
 391
 392         key = caa_container_of(node, struct ust_app_key, node);
 393
 394         node = hashtable_lookup(ust_app_ht,
 395                         (void *)((unsigned long) key->pid), sizeof(void *), &iter);
 396         if (node == NULL) {
 397                 DBG2("UST app find by sock %d not found", sock);
 398                 goto error;
 399         }
 400         return caa_container_of(node, struct ust_app, node);
 401
 402 error:
 403         return NULL;
 404 }
 405
 406 /*
 407  * Create the channel context on the tracer.
 408  */
 409 static
 410 int create_ust_channel_context(struct ust_app_channel *ua_chan,
 411                 struct ust_app_ctx *ua_ctx, struct ust_app *app)
 412 {
 413         int ret;
 414
 415         ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
 416                         ua_chan->obj, &ua_ctx->obj);
 417         if (ret < 0) {
 418                 goto error;
 419         }
 420
 421         ua_ctx->handle = ua_ctx->obj->handle;
 422
 423         DBG2("UST app context added to channel %s successfully", ua_chan->name);
 424
 425 error:
 426         return ret;
 427 }
 428
 429 /*
 430  * Create the event context on the tracer.
 431  */
 432 static
 433 int create_ust_event_context(struct ust_app_event *ua_event,
 434                 struct ust_app_ctx *ua_ctx, struct ust_app *app)
 435 {
 436         int ret;
 437
 438         ret = ustctl_add_context(app->key.sock, &ua_ctx->ctx,
 439                         ua_event->obj, &ua_ctx->obj);
 440         if (ret < 0) {
 441                 goto error;
 442         }
 443
 444         ua_ctx->handle = ua_ctx->obj->handle;
 445
 446         DBG2("UST app context added to event %s successfully", ua_event->name);
 447
 448 error:
 449         return ret;
 450 }
 451
 452 /*
 453  * Disable the specified event on to UST tracer for the UST session.
 454  */
 455 static int disable_ust_event(struct ust_app *app,
 456                 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
 457 {
 458         int ret;
 459
 460         ret = ustctl_disable(app->key.sock, ua_event->obj);
 461         if (ret < 0) {
 462                 ERR("UST app event %s disable failed for app (pid: %d) "
 463                                 "and session handle %d with ret %d",
 464                                 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
 465                 goto error;
 466         }
 467
 468         DBG2("UST app event %s disabled successfully for app (pid: %d)",
 469                         ua_event->attr.name, app->key.pid);
 470
 471 error:
 472         return ret;
 473 }
 474
 475 /*
 476  * Disable the specified channel on to UST tracer for the UST session.
 477  */
 478 static int disable_ust_channel(struct ust_app *app,
 479                 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
 480 {
 481         int ret;
 482
 483         ret = ustctl_disable(app->key.sock, ua_chan->obj);
 484         if (ret < 0) {
 485                 ERR("UST app channel %s disable failed for app (pid: %d) "
 486                                 "and session handle %d with ret %d",
 487                                 ua_chan->name, app->key.pid, ua_sess->handle, ret);
 488                 goto error;
 489         }
 490
 491         DBG2("UST app channel %s disabled successfully for app (pid: %d)",
 492                         ua_chan->name, app->key.pid);
 493
 494 error:
 495         return ret;
 496 }
 497
 498 /*
 499  * Enable the specified channel on to UST tracer for the UST session.
 500  */
 501 static int enable_ust_channel(struct ust_app *app,
 502                 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
 503 {
 504         int ret;
 505
 506         ret = ustctl_enable(app->key.sock, ua_chan->obj);
 507         if (ret < 0) {
 508                 ERR("UST app channel %s enable failed for app (pid: %d) "
 509                                 "and session handle %d with ret %d",
 510                                 ua_chan->name, app->key.pid, ua_sess->handle, ret);
 511                 goto error;
 512         }
 513
 514         ua_chan->enabled = 1;
 515
 516         DBG2("UST app channel %s enabled successfully for app (pid: %d)",
 517                         ua_chan->name, app->key.pid);
 518
 519 error:
 520         return ret;
 521 }
 522
 523 /*
 524  * Enable the specified event on to UST tracer for the UST session.
 525  */
 526 static int enable_ust_event(struct ust_app *app,
 527                 struct ust_app_session *ua_sess, struct ust_app_event *ua_event)
 528 {
 529         int ret;
 530
 531         ret = ustctl_enable(app->key.sock, ua_event->obj);
 532         if (ret < 0) {
 533                 ERR("UST app event %s enable failed for app (pid: %d) "
 534                                 "and session handle %d with ret %d",
 535                                 ua_event->attr.name, app->key.pid, ua_sess->handle, ret);
 536                 goto error;
 537         }
 538
 539         DBG2("UST app event %s enabled successfully for app (pid: %d)",
 540                         ua_event->attr.name, app->key.pid);
 541
 542 error:
 543         return ret;
 544 }
 545
 546 /*
 547  * Open metadata onto the UST tracer for a UST session.
 548  */
 549 static int open_ust_metadata(struct ust_app *app,
 550                 struct ust_app_session *ua_sess)
 551 {
 552         int ret;
 553         struct lttng_ust_channel_attr uattr;
 554
 555         uattr.overwrite = ua_sess->metadata->attr.overwrite;
 556         uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size;
 557         uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf;
 558         uattr.switch_timer_interval =
 559                 ua_sess->metadata->attr.switch_timer_interval;
 560         uattr.read_timer_interval =
 561                 ua_sess->metadata->attr.read_timer_interval;
 562         uattr.output = ua_sess->metadata->attr.output;
 563
 564         /* UST tracer metadata creation */
 565         ret = ustctl_open_metadata(app->key.sock, ua_sess->handle, &uattr,
 566                         &ua_sess->metadata->obj);
 567         if (ret < 0) {
 568                 ERR("UST app open metadata failed for app pid:%d",
 569                                 app->key.pid);
 570                 goto error;
 571         }
 572
 573         ua_sess->metadata->handle = ua_sess->metadata->obj->handle;
 574
 575 error:
 576         return ret;
 577 }
 578
 579 /*
 580  * Create stream onto the UST tracer for a UST session.
 581  */
 582 static int create_ust_stream(struct ust_app *app,
 583                 struct ust_app_session *ua_sess)
 584 {
 585         int ret;
 586
 587         ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj,
 588                         &ua_sess->metadata->stream_obj);
 589         if (ret < 0) {
 590                 ERR("UST create metadata stream failed");
 591                 goto error;
 592         }
 593
 594 error:
 595         return ret;
 596 }
 597
 598 /*
 599  * Create the specified channel onto the UST tracer for a UST session.
 600  */
 601 static int create_ust_channel(struct ust_app *app,
 602                 struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan)
 603 {
 604         int ret;
 605
 606         /* TODO: remove cast and use lttng-ust-abi.h */
 607         ret = ustctl_create_channel(app->key.sock, ua_sess->handle,
 608                         (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj);
 609         if (ret < 0) {
 610                 DBG("Error creating channel %s for app (pid: %d, sock: %d) "
 611                                 "and session handle %d with ret %d",
 612                                 ua_chan->name, app->key.pid, app->key.sock,
 613                                 ua_sess->handle, ret);
 614                 goto error;
 615         }
 616
 617         ua_chan->handle = ua_chan->obj->handle;
 618         ua_chan->attr.shm_fd = ua_chan->obj->shm_fd;
 619         ua_chan->attr.wait_fd = ua_chan->obj->wait_fd;
 620         ua_chan->attr.memory_map_size = ua_chan->obj->memory_map_size;
 621
 622         DBG2("UST app channel %s created successfully for pid:%d and sock:%d",
 623                         ua_chan->name, app->key.pid, app->key.sock);
 624
 625         /* If channel is not enabled, disable it on the tracer */
 626         if (!ua_chan->enabled) {
 627                 ret = disable_ust_channel(app, ua_sess, ua_chan);
 628                 if (ret < 0) {
 629                         goto error;
 630                 }
 631         }
 632
 633 error:
 634         return ret;
 635 }
 636
 637 /*
 638  * Create the specified event onto the UST tracer for a UST session.
 639  */
 640 static
 641 int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess,
 642                 struct ust_app_channel *ua_chan, struct ust_app_event *ua_event)
 643 {
 644         int ret = 0;
 645
 646         /* Create UST event on tracer */
 647         ret = ustctl_create_event(app->key.sock, &ua_event->attr, ua_chan->obj,
 648                         &ua_event->obj);
 649         if (ret < 0) {
 650                 ERR("Error ustctl create event %s for app pid: %d with ret %d",
 651                                 ua_event->attr.name, app->key.pid, ret);
 652                 goto error;
 653         }
 654
 655         ua_event->handle = ua_event->obj->handle;
 656
 657         DBG2("UST app event %s created successfully for pid:%d",
 658                         ua_event->attr.name, app->key.pid);
 659
 660         /* If event not enabled, disable it on the tracer */
 661         if (!ua_event->enabled) {
 662                 ret = disable_ust_event(app, ua_sess, ua_event);
 663                 if (ret < 0) {
 664                         goto error;
 665                 }
 666         }
 667
 668 error:
 669         return ret;
 670 }
 671
 672 /*
 673  * Copy data between an UST app event and a LTT event.
 674  */
 675 static void shadow_copy_event(struct ust_app_event *ua_event,
 676                 struct ltt_ust_event *uevent)
 677 {
 678         struct cds_lfht_iter iter;
 679         struct ltt_ust_context *uctx;
 680         struct ust_app_ctx *ua_ctx;
 681
 682         strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name));
 683         ua_event->name[sizeof(ua_event->name) - 1] = '\0';
 684
 685         /* Copy event attributes */
 686         memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr));
 687
 688         cds_lfht_for_each_entry(uevent->ctx, &iter, uctx, node) {
 689                 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
 690                 if (ua_ctx == NULL) {
 691                         continue;
 692                 }
 693                 hashtable_node_init(&ua_ctx->node,
 694                                 (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
 695                 hashtable_add_unique(ua_event->ctx, &ua_ctx->node);
 696         }
 697 }
 698
 699 /*
 700  * Copy data between an UST app channel and a LTT channel.
 701  */
 702 static void shadow_copy_channel(struct ust_app_channel *ua_chan,
 703                 struct ltt_ust_channel *uchan)
 704 {
 705         struct cds_lfht_iter iter;
 706         struct cds_lfht_node *ua_event_node;
 707         struct ltt_ust_event *uevent;
 708         struct ltt_ust_context *uctx;
 709         struct ust_app_event *ua_event;
 710         struct ust_app_ctx *ua_ctx;
 711
 712         DBG2("Shadow copy of UST app channel %s", ua_chan->name);
 713
 714         strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name));
 715         ua_chan->name[sizeof(ua_chan->name) - 1] = '\0';
 716         /* Copy event attributes */
 717         memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr));
 718
 719         cds_lfht_for_each_entry(uchan->ctx, &iter, uctx, node) {
 720                 ua_ctx = alloc_ust_app_ctx(&uctx->ctx);
 721                 if (ua_ctx == NULL) {
 722                         continue;
 723                 }
 724                 hashtable_node_init(&ua_ctx->node,
 725                                 (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
 726                 hashtable_add_unique(ua_chan->ctx, &ua_ctx->node);
 727         }
 728
 729         /* Copy all events from ltt ust channel to ust app channel */
 730         cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) {
 731                 struct cds_lfht_iter uiter;
 732
 733                 ua_event_node = hashtable_lookup(ua_chan->events,
 734                                 (void *) uevent->attr.name, strlen(uevent->attr.name),
 735                                 &uiter);
 736                 if (ua_event_node == NULL) {
 737                         DBG2("UST event %s not found on shadow copy channel",
 738                                         uevent->attr.name);
 739                         ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
 740                         if (ua_event == NULL) {
 741                                 continue;
 742                         }
 743                         shadow_copy_event(ua_event, uevent);
 744                         hashtable_add_unique(ua_chan->events, &ua_event->node);
 745                 }
 746         }
 747
 748         DBG3("Shadow copy channel done");
 749 }
 750
 751 /*
 752  * Copy data between a UST app session and a regular LTT session.
 753  */
 754 static void shadow_copy_session(struct ust_app_session *ua_sess,
 755                 struct ltt_ust_session *usess,
 756                 struct ust_app *app)
 757 {
 758         struct cds_lfht_node *ua_chan_node;
 759         struct cds_lfht_iter iter;
 760         struct ltt_ust_channel *uchan;
 761         struct ust_app_channel *ua_chan;
 762         time_t rawtime;
 763         struct tm *timeinfo;
 764         char datetime[16];
 765         int ret;
 766
 767         /* Get date and time for unique app path */
 768         time(&rawtime);
 769         timeinfo = localtime(&rawtime);
 770         strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo);
 771
 772         DBG2("Shadow copy of session handle %d", ua_sess->handle);
 773
 774         ua_sess->id = usess->id;
 775         ua_sess->uid = usess->uid;
 776         ua_sess->gid = usess->gid;
 777
 778         ret = snprintf(ua_sess->path, PATH_MAX,
 779                         "%s/%s-%d-%s",
 780                         usess->pathname, app->name, app->key.pid,
 781                         datetime);
 782         if (ret < 0) {
 783                 PERROR("asprintf UST shadow copy session");
 784                 /* TODO: We cannot return an error from here.. */
 785                 assert(0);
 786         }
 787
 788         /* TODO: support all UST domain */
 789
 790         /* Iterate over all channels in global domain. */
 791         cds_lfht_for_each_entry(usess->domain_global.channels, &iter,
 792                         uchan, node) {
 793                 struct cds_lfht_iter uiter;
 794
 795                 ua_chan_node = hashtable_lookup(ua_sess->channels,
 796                                 (void *)uchan->name, strlen(uchan->name),
 797                                 &uiter);
 798                 if (ua_chan_node != NULL) {
 799                         continue;
 800                 }
 801
 802                 DBG2("Channel %s not found on shadow session copy, creating it",
 803                                 uchan->name);
 804                 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
 805                 if (ua_chan == NULL) {
 806                         /* malloc failed... continuing */
 807                         continue;
 808                 }
 809
 810                 shadow_copy_channel(ua_chan, uchan);
 811                 hashtable_add_unique(ua_sess->channels, &ua_chan->node);
 812         }
 813 }
 814
 815 /*
 816  * Lookup sesison wrapper.
 817  */
 818 static
 819 void __lookup_session_by_app(struct ltt_ust_session *usess,
 820                         struct ust_app *app, struct cds_lfht_iter *iter)
 821 {
 822         /* Get right UST app session from app */
 823         (void) hashtable_lookup(app->sessions,
 824                         (void *) ((unsigned long) usess->id), sizeof(void *),
 825                         iter);
 826 }
 827
 828 /*
 829  * Return ust app session from the app session hashtable using the UST session
 830  * id.
 831  */
 832 static struct ust_app_session *lookup_session_by_app(
 833                 struct ltt_ust_session *usess, struct ust_app *app)
 834 {
 835         struct cds_lfht_iter iter;
 836         struct cds_lfht_node *node;
 837
 838         __lookup_session_by_app(usess, app, &iter);
 839         node = hashtable_iter_get_node(&iter);
 840         if (node == NULL) {
 841                 goto error;
 842         }
 843
 844         return caa_container_of(node, struct ust_app_session, node);
 845
 846 error:
 847         return NULL;
 848 }
 849
 850 /*
 851  * Create a UST session onto the tracer of app and add it the session
 852  * hashtable.
 853  *
 854  * Return ust app session or NULL on error.
 855  */
 856 static struct ust_app_session *create_ust_app_session(
 857                 struct ltt_ust_session *usess, struct ust_app *app)
 858 {
 859         int ret;
 860         struct ust_app_session *ua_sess;
 861
 862         ua_sess = lookup_session_by_app(usess, app);
 863         if (ua_sess == NULL) {
 864                 DBG2("UST app pid: %d session id %d not found, creating it",
 865                                 app->key.pid, usess->id);
 866                 ua_sess = alloc_ust_app_session();
 867                 if (ua_sess == NULL) {
 868                         /* Only malloc can failed so something is really wrong */
 869                         goto error;
 870                 }
 871                 shadow_copy_session(ua_sess, usess, app);
 872         }
 873
 874         if (ua_sess->handle == -1) {
 875                 ret = ustctl_create_session(app->key.sock);
 876                 if (ret < 0) {
 877                         ERR("Error creating session for app pid %d, sock %d",
 878                                         app->key.pid, app->key.sock);
 879                         /* TODO: free() ua_sess */
 880                         goto error;
 881                 }
 882
 883                 DBG2("UST app ustctl create session handle %d", ret);
 884                 ua_sess->handle = ret;
 885
 886                 /* Add ust app session to app's HT */
 887                 hashtable_node_init(&ua_sess->node,
 888                                 (void *)((unsigned long) ua_sess->id), sizeof(void *));
 889                 hashtable_add_unique(app->sessions, &ua_sess->node);
 890
 891                 DBG2("UST app session created successfully with handle %d", ret);
 892         }
 893
 894         return ua_sess;
 895
 896 error:
 897         return NULL;
 898 }
 899
 900 /*
 901  * Create a context for the channel on the tracer.
 902  */
 903 static
 904 int create_ust_app_channel_context(struct ust_app_session *ua_sess,
 905                 struct ust_app_channel *ua_chan, struct lttng_ust_context *uctx,
 906                 struct ust_app *app)
 907 {
 908         int ret = 0;
 909         struct cds_lfht_iter iter;
 910         struct cds_lfht_node *node;
 911         struct ust_app_ctx *ua_ctx;
 912
 913         DBG2("UST app adding context to channel %s", ua_chan->name);
 914
 915         node = hashtable_lookup(ua_chan->ctx, (void *)((unsigned long)uctx->ctx),
 916                         sizeof(void *), &iter);
 917         if (node != NULL) {
 918                 ret = -EEXIST;
 919                 goto error;
 920         }
 921
 922         ua_ctx = alloc_ust_app_ctx(uctx);
 923         if (ua_ctx == NULL) {
 924                 /* malloc failed */
 925                 ret = -1;
 926                 goto error;
 927         }
 928
 929         hashtable_node_init(&ua_ctx->node,
 930                         (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
 931         hashtable_add_unique(ua_chan->ctx, &ua_ctx->node);
 932
 933         ret = create_ust_channel_context(ua_chan, ua_ctx, app);
 934         if (ret < 0) {
 935                 goto error;
 936         }
 937
 938 error:
 939         return ret;
 940 }
 941
 942 /*
 943  * Create an UST context and enable it for the event on the tracer.
 944  */
 945 static
 946 int create_ust_app_event_context(struct ust_app_session *ua_sess,
 947                 struct ust_app_event *ua_event, struct lttng_ust_context *uctx,
 948                 struct ust_app *app)
 949 {
 950         int ret = 0;
 951         struct cds_lfht_iter iter;
 952         struct cds_lfht_node *node;
 953         struct ust_app_ctx *ua_ctx;
 954
 955         DBG2("UST app adding context to event %s", ua_event->name);
 956
 957         node = hashtable_lookup(ua_event->ctx, (void *)((unsigned long)uctx->ctx),
 958                         sizeof(void *), &iter);
 959         if (node != NULL) {
 960                 ret = -EEXIST;
 961                 goto error;
 962         }
 963
 964         ua_ctx = alloc_ust_app_ctx(uctx);
 965         if (ua_ctx == NULL) {
 966                 /* malloc failed */
 967                 ret = -1;
 968                 goto error;
 969         }
 970
 971         hashtable_node_init(&ua_ctx->node,
 972                         (void *)((unsigned long) ua_ctx->ctx.ctx), sizeof(void *));
 973         hashtable_add_unique(ua_event->ctx, &ua_ctx->node);
 974
 975         ret = create_ust_event_context(ua_event, ua_ctx, app);
 976         if (ret < 0) {
 977                 goto error;
 978         }
 979
 980 error:
 981         return ret;
 982 }
 983
 984 /*
 985  * Enable on the tracer side a ust app event for the session and channel.
 986  */
 987 static
 988 int enable_ust_app_event(struct ust_app_session *ua_sess,
 989                 struct ust_app_event *ua_event, struct ust_app *app)
 990 {
 991         int ret;
 992
 993         ret = enable_ust_event(app, ua_sess, ua_event);
 994         if (ret < 0) {
 995                 goto error;
 996         }
 997
 998         ua_event->enabled = 1;
 999
1000 error:
1001         return ret;
1002 }
1003
1004 /*
1005  * Disable on the tracer side a ust app event for the session and channel.
1006  */
1007 static int disable_ust_app_event(struct ust_app_session *ua_sess,
1008                 struct ust_app_event *ua_event, struct ust_app *app)
1009 {
1010         int ret;
1011
1012         ret = disable_ust_event(app, ua_sess, ua_event);
1013         if (ret < 0) {
1014                 goto error;
1015         }
1016
1017         ua_event->enabled = 0;
1018
1019 error:
1020         return ret;
1021 }
1022
1023 /*
1024  * Lookup ust app channel for session and disable it on the tracer side.
1025  */
1026 static
1027 int disable_ust_app_channel(struct ust_app_session *ua_sess,
1028                 struct ust_app_channel *ua_chan, struct ust_app *app)
1029 {
1030         int ret;
1031
1032         ret = disable_ust_channel(app, ua_sess, ua_chan);
1033         if (ret < 0) {
1034                 goto error;
1035         }
1036
1037         ua_chan->enabled = 0;
1038
1039 error:
1040         return ret;
1041 }
1042
1043 /*
1044  * Lookup ust app channel for session and enable it on the tracer side.
1045  */
1046 static int enable_ust_app_channel(struct ust_app_session *ua_sess,
1047                 struct ltt_ust_channel *uchan, struct ust_app *app)
1048 {
1049         int ret = 0;
1050         struct cds_lfht_iter iter;
1051         struct cds_lfht_node *ua_chan_node;
1052         struct ust_app_channel *ua_chan;
1053
1054         ua_chan_node = hashtable_lookup(ua_sess->channels,
1055                         (void *)uchan->name, strlen(uchan->name), &iter);
1056         if (ua_chan_node == NULL) {
1057                 DBG2("Unable to find channel %s in ust session id %u",
1058                                 uchan->name, ua_sess->id);
1059                 goto error;
1060         }
1061
1062         ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1063
1064         ret = enable_ust_channel(app, ua_sess, ua_chan);
1065         if (ret < 0) {
1066                 goto error;
1067         }
1068
1069 error:
1070         return ret;
1071 }
1072
1073 /*
1074  * Create UST app channel and create it on the tracer.
1075  */
1076 static struct ust_app_channel *create_ust_app_channel(
1077                 struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan,
1078                 struct ust_app *app)
1079 {
1080         int ret = 0;
1081         struct cds_lfht_iter iter;
1082         struct cds_lfht_node *ua_chan_node;
1083         struct ust_app_channel *ua_chan;
1084
1085         /* Lookup channel in the ust app session */
1086         ua_chan_node = hashtable_lookup(ua_sess->channels,
1087                         (void *)uchan->name, strlen(uchan->name), &iter);
1088         if (ua_chan_node == NULL) {
1089                 DBG2("Unable to find channel %s in ust session id %u",
1090                                 uchan->name, ua_sess->id);
1091                 ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr);
1092                 if (ua_chan == NULL) {
1093                         goto error;
1094                 }
1095                 shadow_copy_channel(ua_chan, uchan);
1096
1097                 hashtable_add_unique(ua_sess->channels, &ua_chan->node);
1098         } else {
1099                 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1100         }
1101
1102         ret = create_ust_channel(app, ua_sess, ua_chan);
1103         if (ret < 0) {
1104                 goto error;
1105         }
1106
1107         return ua_chan;
1108
1109 error:
1110         return NULL;
1111 }
1112
1113 /*
1114  * Create UST app event and create it on the tracer side.
1115  */
1116 static
1117 int create_ust_app_event(struct ust_app_session *ua_sess,
1118                 struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent,
1119                 struct ust_app *app)
1120 {
1121         int ret = 0;
1122         struct cds_lfht_iter iter;
1123         struct cds_lfht_node *ua_event_node;
1124         struct ust_app_event *ua_event;
1125
1126         /* Get event node */
1127         ua_event_node = hashtable_lookup(ua_chan->events,
1128                         (void *)uevent->attr.name, strlen(uevent->attr.name), &iter);
1129         if (ua_event_node != NULL) {
1130                 ERR("UST app event %s already exist. Stopping creation.",
1131                                 uevent->attr.name);
1132                 goto end;
1133         }
1134
1135         /* Does not exist so create one */
1136         ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr);
1137         if (ua_event == NULL) {
1138                 /* Only malloc can failed so something is really wrong */
1139                 ret = -ENOMEM;
1140                 goto error;
1141         }
1142         shadow_copy_event(ua_event, uevent);
1143
1144         /* Create it on the tracer side */
1145         ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
1146         if (ret < 0) {
1147                 rcu_read_lock();
1148                 delete_ust_app_event(app->key.sock, ua_event);
1149                 rcu_read_unlock();
1150                 goto error;
1151         }
1152
1153         ua_event->enabled = 1;
1154
1155         hashtable_add_unique(ua_chan->events, &ua_event->node);
1156
1157         DBG2("UST app create event %s for PID %d completed",
1158                         ua_event->name, app->key.pid);
1159
1160 end:
1161 error:
1162         return ret;
1163 }
1164
1165 /*
1166  * Create UST metadata and open it on the tracer side.
1167  */
1168 static int create_ust_app_metadata(struct ust_app_session *ua_sess,
1169                 char *pathname, struct ust_app *app)
1170 {
1171         int ret = 0;
1172
1173         if (ua_sess->metadata == NULL) {
1174                 /* Allocate UST metadata */
1175                 ua_sess->metadata = trace_ust_create_metadata(pathname);
1176                 if (ua_sess->metadata == NULL) {
1177                         ERR("UST app session %d creating metadata failed",
1178                                         ua_sess->handle);
1179                         goto error;
1180                 }
1181
1182                 ret = open_ust_metadata(app, ua_sess);
1183                 if (ret < 0) {
1184                         goto error;
1185                 }
1186
1187                 DBG2("UST metadata opened for app pid %d", app->key.pid);
1188         }
1189
1190         /* Open UST metadata stream */
1191         if (ua_sess->metadata->stream_obj == NULL) {
1192                 ret = create_ust_stream(app, ua_sess);
1193                 if (ret < 0) {
1194                         goto error;
1195                 }
1196
1197                 ret = mkdir_run_as(ua_sess->path, S_IRWXU | S_IRWXG,
1198                                 ua_sess->uid, ua_sess->gid);
1199                 if (ret < 0) {
1200                         PERROR("mkdir UST metadata");
1201                         goto error;
1202                 }
1203
1204                 ret = snprintf(ua_sess->metadata->pathname, PATH_MAX,
1205                                 "%s/metadata", ua_sess->path);
1206                 if (ret < 0) {
1207                         PERROR("asprintf UST create stream");
1208                         goto error;
1209                 }
1210
1211                 DBG2("UST metadata stream object created for app pid %d",
1212                                 app->key.pid);
1213         } else {
1214                 ERR("Attempting to create stream without metadata opened");
1215                 goto error;
1216         }
1217
1218         return 0;
1219
1220 error:
1221         return -1;
1222 }
1223
1224 /*
1225  * Return pointer to traceable apps list.
1226  */
1227 struct cds_lfht *ust_app_get_ht(void)
1228 {
1229         return ust_app_ht;
1230 }
1231
1232 /*
1233  * Return ust app pointer or NULL if not found.
1234  */
1235 struct ust_app *ust_app_find_by_pid(pid_t pid)
1236 {
1237         struct cds_lfht_node *node;
1238         struct cds_lfht_iter iter;
1239
1240         rcu_read_lock();
1241         node = hashtable_lookup(ust_app_ht,
1242                         (void *)((unsigned long) pid), sizeof(void *), &iter);
1243         if (node == NULL) {
1244                 DBG2("UST app no found with pid %d", pid);
1245                 goto error;
1246         }
1247         rcu_read_unlock();
1248
1249         DBG2("Found UST app by pid %d", pid);
1250
1251         return caa_container_of(node, struct ust_app, node);
1252
1253 error:
1254         rcu_read_unlock();
1255         return NULL;
1256 }
1257
1258 /*
1259  * Using pid and uid (of the app), allocate a new ust_app struct and
1260  * add it to the global traceable app list.
1261  *
1262  * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app
1263  * bitness is not supported.
1264  */
1265 int ust_app_register(struct ust_register_msg *msg, int sock)
1266 {
1267         struct ust_app *lta;
1268
1269         if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL)
1270                         || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) {
1271                 ERR("Registration failed: application \"%s\" (pid: %d) has "
1272                         "%d-bit long, but no consumerd for this long size is available.\n",
1273                         msg->name, msg->pid, msg->bits_per_long);
1274                 close(sock);
1275                 return -EINVAL;
1276         }
1277         lta = zmalloc(sizeof(struct ust_app));
1278         if (lta == NULL) {
1279                 PERROR("malloc");
1280                 return -ENOMEM;
1281         }
1282
1283         lta->ppid = msg->ppid;
1284         lta->uid = msg->uid;
1285         lta->gid = msg->gid;
1286         lta->bits_per_long = msg->bits_per_long;
1287         lta->v_major = msg->major;
1288         lta->v_minor = msg->minor;
1289         strncpy(lta->name, msg->name, sizeof(lta->name));
1290         lta->name[16] = '\0';
1291         lta->sessions = hashtable_new(0);
1292
1293         /* Set key map */
1294         lta->key.pid = msg->pid;
1295         hashtable_node_init(&lta->node, (void *)((unsigned long)lta->key.pid),
1296                         sizeof(void *));
1297         lta->key.sock = sock;
1298         hashtable_node_init(&lta->key.node, (void *)((unsigned long)lta->key.sock),
1299                         sizeof(void *));
1300
1301         rcu_read_lock();
1302         hashtable_add_unique(ust_app_sock_key_map, &lta->key.node);
1303         hashtable_add_unique(ust_app_ht, &lta->node);
1304         rcu_read_unlock();
1305
1306         DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s"
1307                         " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid,
1308                         lta->key.sock, lta->name, lta->v_major, lta->v_minor);
1309
1310         return 0;
1311 }
1312
1313 /*
1314  * Unregister app by removing it from the global traceable app list and freeing
1315  * the data struct.
1316  *
1317  * The socket is already closed at this point so no close to sock.
1318  */
1319 void ust_app_unregister(int sock)
1320 {
1321         struct ust_app *lta;
1322         struct cds_lfht_node *node;
1323         struct cds_lfht_iter iter;
1324         int ret;
1325
1326         rcu_read_lock();
1327         lta = find_app_by_sock(sock);
1328         if (lta == NULL) {
1329                 ERR("Unregister app sock %d not found!", sock);
1330                 goto error;
1331         }
1332
1333         DBG("PID %d unregistering with sock %d", lta->key.pid, sock);
1334
1335         /* Get the node reference for a call_rcu */
1336         node = hashtable_lookup(ust_app_ht,
1337                         (void *)((unsigned long) lta->key.pid), sizeof(void *), &iter);
1338         if (node == NULL) {
1339                 ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid);
1340                 goto error;
1341         }
1342
1343         ret = hashtable_del(ust_app_ht, &iter);
1344         assert(!ret);
1345         call_rcu(&node->head, delete_ust_app_rcu);
1346 error:
1347         rcu_read_unlock();
1348         return;
1349 }
1350
1351 /*
1352  * Return traceable_app_count
1353  */
1354 unsigned long ust_app_list_count(void)
1355 {
1356         unsigned long count;
1357
1358         rcu_read_lock();
1359         count = hashtable_get_count(ust_app_ht);
1360         rcu_read_unlock();
1361
1362         return count;
1363 }
1364
1365 /*
1366  * Fill events array with all events name of all registered apps.
1367  */
1368 int ust_app_list_events(struct lttng_event **events)
1369 {
1370         int ret, handle;
1371         size_t nbmem, count = 0;
1372         struct cds_lfht_iter iter;
1373         struct ust_app *app;
1374         struct lttng_event *tmp;
1375
1376         nbmem = UST_APP_EVENT_LIST_SIZE;
1377         tmp = zmalloc(nbmem * sizeof(struct lttng_event));
1378         if (tmp == NULL) {
1379                 PERROR("zmalloc ust app events");
1380                 ret = -ENOMEM;
1381                 goto error;
1382         }
1383
1384         rcu_read_lock();
1385
1386         cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1387                 struct lttng_ust_tracepoint_iter uiter;
1388
1389                 handle = ustctl_tracepoint_list(app->key.sock);
1390                 if (handle < 0) {
1391                         ERR("UST app list events getting handle failed for app pid %d",
1392                                         app->key.pid);
1393                         continue;
1394                 }
1395
1396                 while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle,
1397                                                 &uiter)) != -ENOENT) {
1398                         if (count >= nbmem) {
1399                                 DBG2("Reallocating event list from %zu to %zu entries", nbmem,
1400                                                 2 * nbmem);
1401                                 nbmem *= 2;
1402                                 tmp = realloc(tmp, nbmem * sizeof(struct lttng_event));
1403                                 if (tmp == NULL) {
1404                                         PERROR("realloc ust app events");
1405                                         ret = -ENOMEM;
1406                                         goto rcu_error;
1407                                 }
1408                         }
1409                         memcpy(tmp[count].name, uiter.name, LTTNG_UST_SYM_NAME_LEN);
1410                         memcpy(tmp[count].loglevel, uiter.loglevel, LTTNG_UST_SYM_NAME_LEN);
1411                         tmp[count].loglevel_value = uiter.loglevel_value;
1412                         tmp[count].type = LTTNG_UST_TRACEPOINT;
1413                         tmp[count].pid = app->key.pid;
1414                         tmp[count].enabled = -1;
1415                         count++;
1416                 }
1417         }
1418
1419         ret = count;
1420         *events = tmp;
1421
1422         DBG2("UST app list events done (%zu events)", count);
1423
1424 rcu_error:
1425         rcu_read_unlock();
1426 error:
1427         return ret;
1428 }
1429
1430 /*
1431  * Free and clean all traceable apps of the global list.
1432  */
1433 void ust_app_clean_list(void)
1434 {
1435         int ret;
1436         struct cds_lfht_iter iter;
1437         struct ust_app *app;
1438
1439         DBG2("UST app cleaning registered apps hash table");
1440
1441         rcu_read_lock();
1442
1443         cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1444                 ret = hashtable_del(ust_app_ht, &iter);
1445                 assert(!ret);
1446                 call_rcu(&iter.node->head, delete_ust_app_rcu);
1447         }
1448
1449         hashtable_destroy(ust_app_ht);
1450         hashtable_destroy(ust_app_sock_key_map);
1451
1452         rcu_read_unlock();
1453 }
1454
1455 /*
1456  * Init UST app hash table.
1457  */
1458 void ust_app_ht_alloc(void)
1459 {
1460         ust_app_ht = hashtable_new(0);
1461         ust_app_sock_key_map = hashtable_new(0);
1462 }
1463
1464 /*
1465  * For a specific UST session, disable the channel for all registered apps.
1466  */
1467 int ust_app_disable_channel_glb(struct ltt_ust_session *usess,
1468                 struct ltt_ust_channel *uchan)
1469 {
1470         int ret = 0;
1471         struct cds_lfht_iter iter;
1472         struct cds_lfht_node *ua_chan_node;
1473         struct ust_app *app;
1474         struct ust_app_session *ua_sess;
1475         struct ust_app_channel *ua_chan;
1476
1477         if (usess == NULL || uchan == NULL) {
1478                 ERR("Disabling UST global channel with NULL values");
1479                 ret = -1;
1480                 goto error;
1481         }
1482
1483         DBG2("UST app disabling channel %s from global domain for session id %d",
1484                         uchan->name, usess->id);
1485
1486         rcu_read_lock();
1487
1488         /* For every registered applications */
1489         cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1490                 struct cds_lfht_iter uiter;
1491
1492                 ua_sess = lookup_session_by_app(usess, app);
1493                 if (ua_sess == NULL) {
1494                         continue;
1495                 }
1496
1497                 /* Get channel */
1498                 ua_chan_node = hashtable_lookup(ua_sess->channels,
1499                                 (void *)uchan->name, strlen(uchan->name), &uiter);
1500                 /* If the session if found for the app, the channel must be there */
1501                 assert(ua_chan_node);
1502
1503                 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1504                 /* The channel must not be already disabled */
1505                 assert(ua_chan->enabled == 1);
1506
1507                 /* Disable channel onto application */
1508                 ret = disable_ust_app_channel(ua_sess, ua_chan, app);
1509                 if (ret < 0) {
1510                         /* XXX: We might want to report this error at some point... */
1511                         continue;
1512                 }
1513         }
1514
1515         rcu_read_unlock();
1516
1517 error:
1518         return ret;
1519 }
1520
1521 /*
1522  * For a specific UST session, enable the channel for all registered apps.
1523  */
1524 int ust_app_enable_channel_glb(struct ltt_ust_session *usess,
1525                 struct ltt_ust_channel *uchan)
1526 {
1527         int ret = 0;
1528         struct cds_lfht_iter iter;
1529         struct ust_app *app;
1530         struct ust_app_session *ua_sess;
1531
1532         if (usess == NULL || uchan == NULL) {
1533                 ERR("Adding UST global channel to NULL values");
1534                 ret = -1;
1535                 goto error;
1536         }
1537
1538         DBG2("UST app enabling channel %s to global domain for session id %d",
1539                         uchan->name, usess->id);
1540
1541         rcu_read_lock();
1542
1543         /* For every registered applications */
1544         cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1545                 ua_sess = lookup_session_by_app(usess, app);
1546                 if (ua_sess == NULL) {
1547                         continue;
1548                 }
1549
1550                 /* Enable channel onto application */
1551                 ret = enable_ust_app_channel(ua_sess, uchan, app);
1552                 if (ret < 0) {
1553                         /* XXX: We might want to report this error at some point... */
1554                         continue;
1555                 }
1556         }
1557
1558         rcu_read_unlock();
1559
1560 error:
1561         return ret;
1562 }
1563
1564 /*
1565  * Disable an event in a channel and for a specific session.
1566  */
1567 int ust_app_disable_event_glb(struct ltt_ust_session *usess,
1568                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1569 {
1570         int ret = 0;
1571         struct cds_lfht_iter iter;
1572         struct cds_lfht_node *ua_chan_node, *ua_event_node;
1573         struct ust_app *app;
1574         struct ust_app_session *ua_sess;
1575         struct ust_app_channel *ua_chan;
1576         struct ust_app_event *ua_event;
1577
1578         DBG("UST app disabling event %s for all apps in channel "
1579                         "%s for session id %d", uevent->attr.name, uchan->name, usess->id);
1580
1581         rcu_read_lock();
1582
1583         /* For all registered applications */
1584         cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1585                 struct cds_lfht_iter uiter;
1586
1587                 ua_sess = lookup_session_by_app(usess, app);
1588                 if (ua_sess == NULL) {
1589                         /* Next app */
1590                         continue;
1591                 }
1592
1593                 /* Lookup channel in the ust app session */
1594                 ua_chan_node = hashtable_lookup(ua_sess->channels,
1595                                 (void *)uchan->name, strlen(uchan->name), &uiter);
1596                 if (ua_chan_node == NULL) {
1597                         DBG2("Channel %s not found in session id %d for app pid %d."
1598                                         "Skipping", uchan->name, usess->id, app->key.pid);
1599                         continue;
1600                 }
1601                 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1602
1603                 ua_event_node = hashtable_lookup(ua_chan->events,
1604                                 (void *)uevent->attr.name, strlen(uevent->attr.name), &uiter);
1605                 if (ua_event_node == NULL) {
1606                         DBG2("Event %s not found in channel %s for app pid %d."
1607                                         "Skipping", uevent->attr.name, uchan->name, app->key.pid);
1608                         continue;
1609                 }
1610                 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1611
1612                 ret = disable_ust_app_event(ua_sess, ua_event, app);
1613                 if (ret < 0) {
1614                         /* XXX: Report error someday... */
1615                         continue;
1616                 }
1617         }
1618
1619         rcu_read_unlock();
1620
1621         return ret;
1622 }
1623
1624 /*
1625  * For a specific UST session and UST channel, the event for all
1626  * registered apps.
1627  */
1628 int ust_app_disable_all_event_glb(struct ltt_ust_session *usess,
1629                 struct ltt_ust_channel *uchan)
1630 {
1631         int ret = 0;
1632         struct cds_lfht_iter iter;
1633         struct cds_lfht_node *ua_chan_node;
1634         struct ust_app *app;
1635         struct ust_app_session *ua_sess;
1636         struct ust_app_channel *ua_chan;
1637         struct ust_app_event *ua_event;
1638
1639         DBG("UST app disabling all event for all apps in channel "
1640                         "%s for session id %d", uchan->name, usess->id);
1641
1642         rcu_read_lock();
1643
1644         /* For all registered applications */
1645         cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1646                 struct cds_lfht_iter uiter;
1647
1648                 ua_sess = lookup_session_by_app(usess, app);
1649                 /* If ua_sess is NULL, there is a code flow error */
1650                 assert(ua_sess);
1651
1652                 /* Lookup channel in the ust app session */
1653                 ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
1654                                 strlen(uchan->name), &uiter);
1655                 /* If the channel is not found, there is a code flow error */
1656                 assert(ua_chan_node);
1657
1658                 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1659
1660                 /* Disable each events of channel */
1661                 cds_lfht_for_each_entry(ua_chan->events, &uiter, ua_event, node) {
1662                         ret = disable_ust_app_event(ua_sess, ua_event, app);
1663                         if (ret < 0) {
1664                                 /* XXX: Report error someday... */
1665                                 continue;
1666                         }
1667                 }
1668         }
1669
1670         rcu_read_unlock();
1671
1672         return ret;
1673 }
1674
1675 /*
1676  * For a specific UST session, create the channel for all registered apps.
1677  */
1678 int ust_app_create_channel_glb(struct ltt_ust_session *usess,
1679                 struct ltt_ust_channel *uchan)
1680 {
1681         int ret = 0;
1682         struct cds_lfht_iter iter;
1683         struct ust_app *app;
1684         struct ust_app_session *ua_sess;
1685         struct ust_app_channel *ua_chan;
1686
1687         if (usess == NULL || uchan == NULL) {
1688                 ERR("Adding UST global channel to NULL values");
1689                 ret = -1;
1690                 goto error;
1691         }
1692
1693         DBG2("UST app adding channel %s to global domain for session id %d",
1694                         uchan->name, usess->id);
1695
1696         rcu_read_lock();
1697
1698         /* For every registered applications */
1699         cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1700                 /*
1701                  * Create session on the tracer side and add it to app session HT. Note
1702                  * that if session exist, it will simply return a pointer to the ust
1703                  * app session.
1704                  */
1705                 ua_sess = create_ust_app_session(usess, app);
1706                 if (ua_sess == NULL) {
1707                         continue;
1708                 }
1709
1710                 /* Create channel onto application */
1711                 ua_chan = create_ust_app_channel(ua_sess, uchan, app);
1712                 if (ua_chan == NULL) {
1713                         continue;
1714                 }
1715         }
1716
1717         rcu_read_unlock();
1718
1719 error:
1720         return ret;
1721 }
1722
1723 /*
1724  * Enable event for a specific session and channel on the tracer.
1725  */
1726 int ust_app_enable_event_glb(struct ltt_ust_session *usess,
1727                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1728 {
1729         int ret = 0;
1730         struct cds_lfht_iter iter;
1731         struct cds_lfht_node *ua_chan_node, *ua_event_node;
1732         struct ust_app *app;
1733         struct ust_app_session *ua_sess;
1734         struct ust_app_channel *ua_chan;
1735         struct ust_app_event *ua_event;
1736
1737         DBG("UST app enabling event %s for all apps for session id %d",
1738                         uevent->attr.name, usess->id);
1739
1740         /*
1741          * NOTE: At this point, this function is called only if the session and
1742          * channel passed are already created for all apps. and enabled on the
1743          * tracer also.
1744          */
1745
1746         rcu_read_lock();
1747
1748         /* For all registered applications */
1749         cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1750                 struct cds_lfht_iter uiter;
1751
1752                 ua_sess = lookup_session_by_app(usess, app);
1753                 /* If ua_sess is NULL, there is a code flow error */
1754                 assert(ua_sess);
1755
1756                 /* Lookup channel in the ust app session */
1757                 ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
1758                                 strlen(uchan->name), &uiter);
1759                 /* If the channel is not found, there is a code flow error */
1760                 assert(ua_chan_node);
1761
1762                 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1763
1764                 ua_event_node = hashtable_lookup(ua_chan->events,
1765                                 (void*)uevent->attr.name, strlen(uevent->attr.name), &uiter);
1766                 if (ua_event_node == NULL) {
1767                         DBG3("UST app enable event %s not found for app PID %d."
1768                                         "Skipping app", uevent->attr.name, app->key.pid);
1769                         continue;
1770                 }
1771                 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
1772
1773                 ret = enable_ust_app_event(ua_sess, ua_event, app);
1774                 if (ret < 0) {
1775                         goto error;
1776                 }
1777         }
1778
1779 error:
1780         rcu_read_unlock();
1781         return ret;
1782 }
1783
1784 /*
1785  * For a specific existing UST session and UST channel, creates the event for
1786  * all registered apps.
1787  */
1788 int ust_app_create_event_glb(struct ltt_ust_session *usess,
1789                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent)
1790 {
1791         int ret = 0;
1792         struct cds_lfht_iter iter;
1793         struct cds_lfht_node *ua_chan_node;
1794         struct ust_app *app;
1795         struct ust_app_session *ua_sess;
1796         struct ust_app_channel *ua_chan;
1797
1798         DBG("UST app creating event %s for all apps for session id %d",
1799                         uevent->attr.name, usess->id);
1800
1801         /*
1802          * NOTE: At this point, this function is called only if the session and
1803          * channel passed are already created for all apps. and enabled on the
1804          * tracer also.
1805          */
1806
1807         rcu_read_lock();
1808
1809         /* For all registered applications */
1810         cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
1811                 struct cds_lfht_iter uiter;
1812
1813                 ua_sess = lookup_session_by_app(usess, app);
1814                 /* If ua_sess is NULL, there is a code flow error */
1815                 assert(ua_sess);
1816
1817                 /* Lookup channel in the ust app session */
1818                 ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
1819                                 strlen(uchan->name), &uiter);
1820                 /* If the channel is not found, there is a code flow error */
1821                 assert(ua_chan_node);
1822
1823                 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
1824
1825                 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
1826                 if (ret < 0) {
1827                         continue;
1828                 }
1829         }
1830
1831         rcu_read_unlock();
1832
1833         return ret;
1834 }
1835
1836 /*
1837  * Start tracing for a specific UST session and app.
1838  */
1839 int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app)
1840 {
1841         int ret = 0;
1842         struct cds_lfht_iter iter;
1843         struct ust_app_session *ua_sess;
1844         struct ust_app_channel *ua_chan;
1845         struct ltt_ust_stream *ustream;
1846         int consumerd_fd;
1847
1848         DBG("Starting tracing for ust app pid %d", app->key.pid);
1849
1850         rcu_read_lock();
1851
1852         ua_sess = lookup_session_by_app(usess, app);
1853         if (ua_sess == NULL) {
1854                 goto error_rcu_unlock;
1855         }
1856
1857         /* Upon restart, we skip the setup, already done */
1858         if (ua_sess->started) {
1859                 goto skip_setup;
1860         }
1861
1862         ret = create_ust_app_metadata(ua_sess, usess->pathname, app);
1863         if (ret < 0) {
1864                 goto error_rcu_unlock;
1865         }
1866
1867         /* For each channel */
1868         cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
1869                 /* Create all streams */
1870                 while (1) {
1871                         /* Create UST stream */
1872                         ustream = zmalloc(sizeof(*ustream));
1873                         if (ustream == NULL) {
1874                                 PERROR("zmalloc ust stream");
1875                                 goto error_rcu_unlock;
1876                         }
1877
1878                         ret = ustctl_create_stream(app->key.sock, ua_chan->obj,
1879                                         &ustream->obj);
1880                         if (ret < 0) {
1881                                 /* Got all streams */
1882                                 break;
1883                         }
1884                         ustream->handle = ustream->obj->handle;
1885
1886                         /* Order is important */
1887                         cds_list_add_tail(&ustream->list, &ua_chan->streams.head);
1888                         ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u",
1889                                         ua_sess->path, ua_chan->name,
1890                                         ua_chan->streams.count++);
1891                         if (ret < 0) {
1892                                 PERROR("asprintf UST create stream");
1893                                 continue;
1894                         }
1895                         DBG2("UST stream %d ready at %s", ua_chan->streams.count,
1896                                         ustream->pathname);
1897                 }
1898         }
1899
1900         switch (app->bits_per_long) {
1901         case 64:
1902                 consumerd_fd = ust_consumerd64_fd;
1903                 break;
1904         case 32:
1905                 consumerd_fd = ust_consumerd32_fd;
1906                 break;
1907         default:
1908                 ret = -EINVAL;
1909                 goto error_rcu_unlock;
1910         }
1911
1912         /* Setup UST consumer socket and send fds to it */
1913         ret = ust_consumer_send_session(consumerd_fd, ua_sess);
1914         if (ret < 0) {
1915                 goto error_rcu_unlock;
1916         }
1917         ua_sess->started = 1;
1918
1919 skip_setup:
1920         /* This start the UST tracing */
1921         ret = ustctl_start_session(app->key.sock, ua_sess->handle);
1922         if (ret < 0) {
1923                 ERR("Error starting tracing for app pid: %d", app->key.pid);
1924                 goto error_rcu_unlock;
1925         }
1926
1927         rcu_read_unlock();
1928
1929         /* Quiescent wait after starting trace */
1930         ustctl_wait_quiescent(app->key.sock);
1931
1932         return 0;
1933
1934 error_rcu_unlock:
1935         rcu_read_unlock();
1936         return -1;
1937 }
1938
1939 /*
1940  * Stop tracing for a specific UST session and app.
1941  */
1942 int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app)
1943 {
1944         int ret = 0;
1945         struct cds_lfht_iter iter;
1946         struct ust_app_session *ua_sess;
1947         struct ust_app_channel *ua_chan;
1948
1949         DBG("Stopping tracing for ust app pid %d", app->key.pid);
1950
1951         rcu_read_lock();
1952
1953         ua_sess = lookup_session_by_app(usess, app);
1954         if (ua_sess == NULL) {
1955                 /* Only malloc can failed so something is really wrong */
1956                 goto error_rcu_unlock;
1957         }
1958
1959         /* This inhibits UST tracing */
1960         ret = ustctl_stop_session(app->key.sock, ua_sess->handle);
1961         if (ret < 0) {
1962                 ERR("Error stopping tracing for app pid: %d", app->key.pid);
1963                 goto error_rcu_unlock;
1964         }
1965
1966         /* Quiescent wait after stopping trace */
1967         ustctl_wait_quiescent(app->key.sock);
1968
1969         /* Flushing buffers */
1970         cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
1971                 ret = ustctl_sock_flush_buffer(app->key.sock, ua_chan->obj);
1972                 if (ret < 0) {
1973                         ERR("UST app PID %d channel %s flush failed",
1974                                         app->key.pid, ua_chan->name);
1975                         ERR("Ended with ret %d", ret);
1976                         /* Continuing flushing all buffers */
1977                         continue;
1978                 }
1979         }
1980
1981         /* Flush all buffers before stopping */
1982         ret = ustctl_sock_flush_buffer(app->key.sock, ua_sess->metadata->obj);
1983         if (ret < 0) {
1984                 ERR("UST app PID %d metadata flush failed", app->key.pid);
1985                 ERR("Ended with ret %d", ret);
1986         }
1987
1988         rcu_read_unlock();
1989
1990         return 0;
1991
1992 error_rcu_unlock:
1993         rcu_read_unlock();
1994         return -1;
1995 }
1996
1997 /*
1998  * Destroy a specific UST session in apps.
1999  */
2000 int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app)
2001 {
2002         struct ust_app_session *ua_sess;
2003         struct lttng_ust_object_data obj;
2004         struct cds_lfht_iter iter;
2005         struct cds_lfht_node *node;
2006         int ret;
2007
2008         DBG("Destroy tracing for ust app pid %d", app->key.pid);
2009
2010         rcu_read_lock();
2011
2012         __lookup_session_by_app(usess, app, &iter);
2013         node = hashtable_iter_get_node(&iter);
2014         if (node == NULL) {
2015                 /* Only malloc can failed so something is really wrong */
2016                 goto error_rcu_unlock;
2017         }
2018         ua_sess = caa_container_of(node, struct ust_app_session, node);
2019         ret = hashtable_del(app->sessions, &iter);
2020         assert(!ret);
2021         delete_ust_app_session(app->key.sock, ua_sess);
2022         obj.handle = ua_sess->handle;
2023         obj.shm_fd = -1;
2024         obj.wait_fd = -1;
2025         obj.memory_map_size = 0;
2026         ustctl_release_object(app->key.sock, &obj);
2027
2028         rcu_read_unlock();
2029
2030         /* Quiescent wait after stopping trace */
2031         ustctl_wait_quiescent(app->key.sock);
2032
2033         return 0;
2034
2035 error_rcu_unlock:
2036         rcu_read_unlock();
2037         return -1;
2038 }
2039
2040 /*
2041  * Start tracing for the UST session.
2042  */
2043 int ust_app_start_trace_all(struct ltt_ust_session *usess)
2044 {
2045         int ret = 0;
2046         struct cds_lfht_iter iter;
2047         struct ust_app *app;
2048
2049         DBG("Starting all UST traces");
2050
2051         rcu_read_lock();
2052
2053         cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
2054                 ret = ust_app_start_trace(usess, app);
2055                 if (ret < 0) {
2056                         /* Continue to next apps even on error */
2057                         continue;
2058                 }
2059         }
2060
2061         rcu_read_unlock();
2062
2063         return 0;
2064 }
2065
2066 /*
2067  * Start tracing for the UST session.
2068  */
2069 int ust_app_stop_trace_all(struct ltt_ust_session *usess)
2070 {
2071         int ret = 0;
2072         struct cds_lfht_iter iter;
2073         struct ust_app *app;
2074
2075         DBG("Stopping all UST traces");
2076
2077         rcu_read_lock();
2078
2079         cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
2080                 ret = ust_app_stop_trace(usess, app);
2081                 if (ret < 0) {
2082                         /* Continue to next apps even on error */
2083                         continue;
2084                 }
2085         }
2086
2087         rcu_read_unlock();
2088
2089         return 0;
2090 }
2091
2092 /*
2093  * Destroy app UST session.
2094  */
2095 int ust_app_destroy_trace_all(struct ltt_ust_session *usess)
2096 {
2097         int ret = 0;
2098         struct cds_lfht_iter iter;
2099         struct ust_app *app;
2100
2101         DBG("Destroy all UST traces");
2102
2103         rcu_read_lock();
2104
2105         cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
2106                 ret = ust_app_destroy_trace(usess, app);
2107                 if (ret < 0) {
2108                         /* Continue to next apps even on error */
2109                         continue;
2110                 }
2111         }
2112
2113         rcu_read_unlock();
2114
2115         return 0;
2116 }
2117
2118 /*
2119  * Add channels/events from UST global domain to registered apps at sock.
2120  */
2121 void ust_app_global_update(struct ltt_ust_session *usess, int sock)
2122 {
2123         int ret = 0;
2124         struct cds_lfht_iter iter;
2125         struct ust_app *app;
2126         struct ust_app_session *ua_sess;
2127         struct ust_app_channel *ua_chan;
2128         struct ust_app_event *ua_event;
2129
2130         if (usess == NULL) {
2131                 ERR("No UST session on global update. Returning");
2132                 goto error;
2133         }
2134
2135         DBG2("UST app global update for app sock %d for session id %d", sock,
2136                         usess->id);
2137
2138         rcu_read_lock();
2139
2140         app = find_app_by_sock(sock);
2141         if (app == NULL) {
2142                 ERR("Failed to update app sock %d", sock);
2143                 goto error;
2144         }
2145
2146         ua_sess = create_ust_app_session(usess, app);
2147         if (ua_sess == NULL) {
2148                 goto error;
2149         }
2150
2151         /*
2152          * We can iterate safely here over all UST app session sicne the create ust
2153          * app session above made a shadow copy of the UST global domain from the
2154          * ltt ust session.
2155          */
2156         cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) {
2157                 struct cds_lfht_iter uiter;
2158
2159                 ret = create_ust_channel(app, ua_sess, ua_chan);
2160                 if (ret < 0) {
2161                         /* FIXME: Should we quit here or continue... */
2162                         continue;
2163                 }
2164
2165                 /* For each events */
2166                 cds_lfht_for_each_entry(ua_chan->events, &uiter, ua_event, node) {
2167                         ret = create_ust_event(app, ua_sess, ua_chan, ua_event);
2168                         if (ret < 0) {
2169                                 /* FIXME: Should we quit here or continue... */
2170                                 continue;
2171                         }
2172                 }
2173         }
2174
2175         if (usess->start_trace) {
2176                 ret = ust_app_start_trace(usess, app);
2177                 if (ret < 0) {
2178                         goto error;
2179                 }
2180
2181                 DBG2("UST trace started for app pid %d", app->key.pid);
2182         }
2183
2184 error:
2185         rcu_read_unlock();
2186         return;
2187 }
2188
2189 /*
2190  * Add context to a specific channel for global UST domain.
2191  */
2192 int ust_app_add_ctx_channel_glb(struct ltt_ust_session *usess,
2193                 struct ltt_ust_channel *uchan, struct ltt_ust_context *uctx)
2194 {
2195         int ret = 0;
2196         struct cds_lfht_node *ua_chan_node;
2197         struct cds_lfht_iter iter;
2198         struct ust_app_channel *ua_chan = NULL;
2199         struct ust_app_session *ua_sess;
2200         struct ust_app *app;
2201
2202         rcu_read_lock();
2203
2204         cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
2205                 struct cds_lfht_iter uiter;
2206
2207                 ua_sess = lookup_session_by_app(usess, app);
2208                 if (ua_sess == NULL) {
2209                         continue;
2210                 }
2211
2212                 /* Lookup channel in the ust app session */
2213                 ua_chan_node = hashtable_lookup(ua_sess->channels,
2214                                 (void *)uchan->name, strlen(uchan->name), &uiter);
2215                 if (ua_chan_node == NULL) {
2216                         continue;
2217                 }
2218                 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2219                                 node);
2220
2221                 ret = create_ust_app_channel_context(ua_sess, ua_chan, &uctx->ctx, app);
2222                 if (ret < 0) {
2223                         continue;
2224                 }
2225         }
2226
2227         rcu_read_unlock();
2228         return ret;
2229 }
2230
2231 /*
2232  * Add context to a specific event in a channel for global UST domain.
2233  */
2234 int ust_app_add_ctx_event_glb(struct ltt_ust_session *usess,
2235                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent,
2236                 struct ltt_ust_context *uctx)
2237 {
2238         int ret = 0;
2239         struct cds_lfht_node *ua_chan_node, *ua_event_node;
2240         struct cds_lfht_iter iter;
2241         struct ust_app_session *ua_sess;
2242         struct ust_app_event *ua_event;
2243         struct ust_app_channel *ua_chan = NULL;
2244         struct ust_app *app;
2245
2246         rcu_read_lock();
2247
2248         cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) {
2249                 struct cds_lfht_iter uiter;
2250
2251                 ua_sess = lookup_session_by_app(usess, app);
2252                 if (ua_sess == NULL) {
2253                         continue;
2254                 }
2255
2256                 /* Lookup channel in the ust app session */
2257                 ua_chan_node = hashtable_lookup(ua_sess->channels,
2258                                 (void *)uchan->name, strlen(uchan->name), &uiter);
2259                 if (ua_chan_node == NULL) {
2260                         continue;
2261                 }
2262                 ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel,
2263                                 node);
2264
2265                 ua_event_node = hashtable_lookup(ua_chan->events,
2266                                 (void *)uevent->attr.name, strlen(uevent->attr.name), &uiter);
2267                 if (ua_event_node == NULL) {
2268                         continue;
2269                 }
2270                 ua_event = caa_container_of(ua_event_node, struct ust_app_event,
2271                                 node);
2272
2273                 ret = create_ust_app_event_context(ua_sess, ua_event, &uctx->ctx, app);
2274                 if (ret < 0) {
2275                         continue;
2276                 }
2277         }
2278
2279         rcu_read_unlock();
2280         return ret;
2281 }
2282
2283 /*
2284  * Enable event for a channel from a UST session for a specific PID.
2285  */
2286 int ust_app_enable_event_pid(struct ltt_ust_session *usess,
2287                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2288 {
2289         int ret = 0;
2290         struct cds_lfht_iter iter;
2291         struct cds_lfht_node *ua_chan_node, *ua_event_node;
2292         struct ust_app *app;
2293         struct ust_app_session *ua_sess;
2294         struct ust_app_channel *ua_chan;
2295         struct ust_app_event *ua_event;
2296
2297         DBG("UST app enabling event %s for PID %d", uevent->attr.name, pid);
2298
2299         rcu_read_lock();
2300
2301         app = ust_app_find_by_pid(pid);
2302         if (app == NULL) {
2303                 ERR("UST app enable event per PID %d not found", pid);
2304                 ret = -1;
2305                 goto error;
2306         }
2307
2308         ua_sess = lookup_session_by_app(usess, app);
2309         /* If ua_sess is NULL, there is a code flow error */
2310         assert(ua_sess);
2311
2312         /* Lookup channel in the ust app session */
2313         ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
2314                         strlen(uchan->name), &iter);
2315         /* If the channel is not found, there is a code flow error */
2316         assert(ua_chan_node);
2317
2318         ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2319
2320         ua_event_node = hashtable_lookup(ua_chan->events,
2321                         (void*)uevent->attr.name, strlen(uevent->attr.name), &iter);
2322         if (ua_event_node == NULL) {
2323                 ret = create_ust_app_event(ua_sess, ua_chan, uevent, app);
2324                 if (ret < 0) {
2325                         goto error;
2326                 }
2327         } else {
2328                 ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2329
2330                 ret = enable_ust_app_event(ua_sess, ua_event, app);
2331                 if (ret < 0) {
2332                         goto error;
2333                 }
2334         }
2335
2336 error:
2337         rcu_read_unlock();
2338         return ret;
2339 }
2340
2341 /*
2342  * Disable event for a channel from a UST session for a specific PID.
2343  */
2344 int ust_app_disable_event_pid(struct ltt_ust_session *usess,
2345                 struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent, pid_t pid)
2346 {
2347         int ret = 0;
2348         struct cds_lfht_iter iter;
2349         struct cds_lfht_node *ua_chan_node, *ua_event_node;
2350         struct ust_app *app;
2351         struct ust_app_session *ua_sess;
2352         struct ust_app_channel *ua_chan;
2353         struct ust_app_event *ua_event;
2354
2355         DBG("UST app disabling event %s for PID %d", uevent->attr.name, pid);
2356
2357         rcu_read_lock();
2358
2359         app = ust_app_find_by_pid(pid);
2360         if (app == NULL) {
2361                 ERR("UST app disable event per PID %d not found", pid);
2362                 ret = -1;
2363                 goto error;
2364         }
2365
2366         ua_sess = lookup_session_by_app(usess, app);
2367         /* If ua_sess is NULL, there is a code flow error */
2368         assert(ua_sess);
2369
2370         /* Lookup channel in the ust app session */
2371         ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name,
2372                         strlen(uchan->name), &iter);
2373         if (ua_chan_node == NULL) {
2374                 /* Channel does not exist, skip disabling */
2375                 goto error;
2376         }
2377         ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node);
2378
2379         ua_event_node = hashtable_lookup(ua_chan->events,
2380                         (void*)uevent->attr.name, strlen(uevent->attr.name), &iter);
2381         if (ua_event_node == NULL) {
2382                 /* Event does not exist, skip disabling */
2383                 goto error;
2384         }
2385         ua_event = caa_container_of(ua_event_node, struct ust_app_event, node);
2386
2387         ret = disable_ust_app_event(ua_sess, ua_event, app);
2388         if (ret < 0) {
2389                 goto error;
2390         }
2391
2392 error:
2393         rcu_read_unlock();
2394         return ret;
2395 }