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