| 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 <lttngerr.h> |
| 30 | #include <lttng-share.h> |
| 31 | |
| 32 | #include "hashtable.h" |
| 33 | #include "ust-app.h" |
| 34 | #include "../hashtable/hash.h" |
| 35 | #include "ust-ctl.h" |
| 36 | #include "ust-consumer.h" |
| 37 | |
| 38 | /* |
| 39 | * Delete a traceable application structure from the global list. |
| 40 | */ |
| 41 | static void delete_ust_app(struct ust_app *lta) |
| 42 | { |
| 43 | int ret; |
| 44 | struct cds_lfht_node *node; |
| 45 | struct cds_lfht_iter iter; |
| 46 | |
| 47 | rcu_read_lock(); |
| 48 | |
| 49 | /* TODO: clean session hashtable */ |
| 50 | free(lta->sessions); |
| 51 | close(lta->key.sock); |
| 52 | |
| 53 | /* Remove from apps hash table */ |
| 54 | node = hashtable_lookup(ust_app_ht, |
| 55 | (void *) ((unsigned long) lta->key.pid), sizeof(void *), &iter); |
| 56 | if (node == NULL) { |
| 57 | ERR("UST app pid %d not found in hash table", lta->key.pid); |
| 58 | } else { |
| 59 | ret = hashtable_del(ust_app_ht, &iter); |
| 60 | if (ret) { |
| 61 | ERR("UST app unable to delete app %d from hash table", |
| 62 | lta->key.pid); |
| 63 | } else { |
| 64 | DBG2("UST app pid %d deleted", lta->key.pid); |
| 65 | } |
| 66 | } |
| 67 | |
| 68 | /* Remove from key hash table */ |
| 69 | node = hashtable_lookup(ust_app_sock_key_map, |
| 70 | (void *) ((unsigned long) lta->key.sock), sizeof(void *), &iter); |
| 71 | if (node == NULL) { |
| 72 | ERR("UST app key %d not found in key hash table", lta->key.sock); |
| 73 | } else { |
| 74 | ret = hashtable_del(ust_app_sock_key_map, &iter); |
| 75 | if (ret) { |
| 76 | ERR("UST app unable to delete app sock %d from key hash table", |
| 77 | lta->key.sock); |
| 78 | } else { |
| 79 | DBG2("UST app pair sock %d key %d deleted", |
| 80 | lta->key.sock, lta->key.pid); |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | free(lta); |
| 85 | |
| 86 | rcu_read_unlock(); |
| 87 | } |
| 88 | |
| 89 | /* |
| 90 | * URCU intermediate call to delete an UST app. |
| 91 | */ |
| 92 | static void delete_ust_app_rcu(struct rcu_head *head) |
| 93 | { |
| 94 | struct cds_lfht_node *node = |
| 95 | caa_container_of(head, struct cds_lfht_node, head); |
| 96 | struct ust_app *app = |
| 97 | caa_container_of(node, struct ust_app, node); |
| 98 | |
| 99 | delete_ust_app(app); |
| 100 | } |
| 101 | |
| 102 | /* |
| 103 | * Find an ust_app using the sock and return it. RCU read side lock must be |
| 104 | * held before calling this helper function. |
| 105 | */ |
| 106 | static struct ust_app *find_app_by_sock(int sock) |
| 107 | { |
| 108 | struct cds_lfht_node *node; |
| 109 | struct ust_app_key *key; |
| 110 | struct cds_lfht_iter iter; |
| 111 | |
| 112 | node = hashtable_lookup(ust_app_sock_key_map, |
| 113 | (void *)((unsigned long) sock), sizeof(void *), &iter); |
| 114 | if (node == NULL) { |
| 115 | DBG2("UST app find by sock %d key not found", sock); |
| 116 | goto error; |
| 117 | } |
| 118 | |
| 119 | key = caa_container_of(node, struct ust_app_key, node); |
| 120 | |
| 121 | node = hashtable_lookup(ust_app_ht, |
| 122 | (void *)((unsigned long) key->pid), sizeof(void *), &iter); |
| 123 | if (node == NULL) { |
| 124 | DBG2("UST app find by sock %d not found", sock); |
| 125 | goto error; |
| 126 | } |
| 127 | |
| 128 | return caa_container_of(node, struct ust_app, node); |
| 129 | |
| 130 | error: |
| 131 | return NULL; |
| 132 | } |
| 133 | |
| 134 | /* |
| 135 | * Return pointer to traceable apps list. |
| 136 | */ |
| 137 | struct cds_lfht *ust_app_get_ht(void) |
| 138 | { |
| 139 | return ust_app_ht; |
| 140 | } |
| 141 | |
| 142 | /* |
| 143 | * Return ust app pointer or NULL if not found. |
| 144 | */ |
| 145 | struct ust_app *ust_app_find_by_pid(pid_t pid) |
| 146 | { |
| 147 | struct cds_lfht_node *node; |
| 148 | struct cds_lfht_iter iter; |
| 149 | |
| 150 | rcu_read_lock(); |
| 151 | node = hashtable_lookup(ust_app_ht, |
| 152 | (void *)((unsigned long) pid), sizeof(void *), &iter); |
| 153 | if (node == NULL) { |
| 154 | DBG2("UST app no found with pid %d", pid); |
| 155 | goto error; |
| 156 | } |
| 157 | rcu_read_unlock(); |
| 158 | |
| 159 | DBG2("Found UST app by pid %d", pid); |
| 160 | |
| 161 | return caa_container_of(node, struct ust_app, node); |
| 162 | |
| 163 | error: |
| 164 | rcu_read_unlock(); |
| 165 | return NULL; |
| 166 | } |
| 167 | |
| 168 | /* |
| 169 | * Using pid and uid (of the app), allocate a new ust_app struct and |
| 170 | * add it to the global traceable app list. |
| 171 | * |
| 172 | * On success, return 0, else return malloc ENOMEM. |
| 173 | */ |
| 174 | int ust_app_register(struct ust_register_msg *msg, int sock) |
| 175 | { |
| 176 | struct ust_app *lta; |
| 177 | |
| 178 | lta = malloc(sizeof(struct ust_app)); |
| 179 | if (lta == NULL) { |
| 180 | PERROR("malloc"); |
| 181 | return -ENOMEM; |
| 182 | } |
| 183 | |
| 184 | lta->uid = msg->uid; |
| 185 | lta->gid = msg->gid; |
| 186 | lta->key.pid = msg->pid; |
| 187 | lta->ppid = msg->ppid; |
| 188 | lta->v_major = msg->major; |
| 189 | lta->v_minor = msg->minor; |
| 190 | lta->key.sock = sock; |
| 191 | strncpy(lta->name, msg->name, sizeof(lta->name)); |
| 192 | lta->name[16] = '\0'; |
| 193 | hashtable_node_init(<a->node, (void *)((unsigned long)lta->key.pid), |
| 194 | sizeof(void *)); |
| 195 | |
| 196 | /* Session hashtable */ |
| 197 | lta->sessions = hashtable_new(0); |
| 198 | |
| 199 | /* Set sock key map */ |
| 200 | hashtable_node_init(<a->key.node, (void *)((unsigned long)lta->key.sock), |
| 201 | sizeof(void *)); |
| 202 | |
| 203 | rcu_read_lock(); |
| 204 | hashtable_add_unique(ust_app_ht, <a->node); |
| 205 | hashtable_add_unique(ust_app_sock_key_map, <a->key.node); |
| 206 | rcu_read_unlock(); |
| 207 | |
| 208 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s" |
| 209 | " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid, |
| 210 | lta->key.sock, lta->name, lta->v_major, lta->v_minor); |
| 211 | |
| 212 | return 0; |
| 213 | } |
| 214 | |
| 215 | /* |
| 216 | * Unregister app by removing it from the global traceable app list and freeing |
| 217 | * the data struct. |
| 218 | * |
| 219 | * The socket is already closed at this point so no close to sock. |
| 220 | */ |
| 221 | void ust_app_unregister(int sock) |
| 222 | { |
| 223 | struct ust_app *lta; |
| 224 | struct cds_lfht_node *node; |
| 225 | struct cds_lfht_iter iter; |
| 226 | |
| 227 | rcu_read_lock(); |
| 228 | lta = find_app_by_sock(sock); |
| 229 | if (lta == NULL) { |
| 230 | ERR("Unregister app sock %d not found!", sock); |
| 231 | goto error; |
| 232 | } |
| 233 | |
| 234 | DBG("PID %d unregistering with sock %d", lta->key.pid, sock); |
| 235 | |
| 236 | /* Get the node reference for a call_rcu */ |
| 237 | node = hashtable_lookup(ust_app_ht, |
| 238 | (void *)((unsigned long) lta->key.pid), sizeof(void *), &iter); |
| 239 | if (node == NULL) { |
| 240 | ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid); |
| 241 | goto error; |
| 242 | } |
| 243 | |
| 244 | call_rcu(&node->head, delete_ust_app_rcu); |
| 245 | |
| 246 | error: |
| 247 | rcu_read_unlock(); |
| 248 | return; |
| 249 | } |
| 250 | |
| 251 | /* |
| 252 | * Return traceable_app_count |
| 253 | */ |
| 254 | unsigned long ust_app_list_count(void) |
| 255 | { |
| 256 | unsigned long count; |
| 257 | |
| 258 | rcu_read_lock(); |
| 259 | count = hashtable_get_count(ust_app_ht); |
| 260 | rcu_read_unlock(); |
| 261 | |
| 262 | return count; |
| 263 | } |
| 264 | |
| 265 | /* |
| 266 | * Fill events array with all events name of all registered apps. |
| 267 | */ |
| 268 | int ust_app_list_events(struct lttng_event **events) |
| 269 | { |
| 270 | int ret, handle; |
| 271 | size_t nbmem, count = 0; |
| 272 | struct cds_lfht_iter iter; |
| 273 | struct ust_app *app; |
| 274 | struct lttng_event *tmp; |
| 275 | |
| 276 | nbmem = UST_APP_EVENT_LIST_SIZE; |
| 277 | tmp = zmalloc(nbmem * sizeof(struct lttng_event)); |
| 278 | if (tmp == NULL) { |
| 279 | PERROR("zmalloc ust app events"); |
| 280 | ret = -ENOMEM; |
| 281 | goto error; |
| 282 | } |
| 283 | |
| 284 | rcu_read_lock(); |
| 285 | |
| 286 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 287 | handle = ustctl_tracepoint_list(app->key.sock); |
| 288 | if (handle < 0) { |
| 289 | ERR("UST app list events getting handle failed for app pid %d", |
| 290 | app->key.pid); |
| 291 | continue; |
| 292 | } |
| 293 | |
| 294 | while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle, |
| 295 | tmp[count].name)) != -ENOENT) { |
| 296 | if (count > nbmem) { |
| 297 | DBG2("Reallocating event list from %zu to %zu bytes", nbmem, |
| 298 | nbmem + UST_APP_EVENT_LIST_SIZE); |
| 299 | nbmem += UST_APP_EVENT_LIST_SIZE; |
| 300 | tmp = realloc(tmp, nbmem); |
| 301 | if (tmp == NULL) { |
| 302 | PERROR("realloc ust app events"); |
| 303 | ret = -ENOMEM; |
| 304 | goto rcu_error; |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | tmp[count].type = LTTNG_UST_TRACEPOINT; |
| 309 | tmp[count].pid = app->key.pid; |
| 310 | count++; |
| 311 | } |
| 312 | } |
| 313 | |
| 314 | ret = count; |
| 315 | *events = tmp; |
| 316 | |
| 317 | DBG2("UST app list events done (%zu events)", count); |
| 318 | |
| 319 | rcu_error: |
| 320 | rcu_read_unlock(); |
| 321 | error: |
| 322 | return ret; |
| 323 | } |
| 324 | |
| 325 | /* |
| 326 | * Free and clean all traceable apps of the global list. |
| 327 | */ |
| 328 | void ust_app_clean_list(void) |
| 329 | { |
| 330 | int ret; |
| 331 | struct cds_lfht_node *node; |
| 332 | struct cds_lfht_iter iter; |
| 333 | |
| 334 | DBG2("UST app clean hash table"); |
| 335 | |
| 336 | rcu_read_lock(); |
| 337 | |
| 338 | hashtable_get_first(ust_app_ht, &iter); |
| 339 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { |
| 340 | ret = hashtable_del(ust_app_ht, &iter); |
| 341 | if (!ret) { |
| 342 | call_rcu(&node->head, delete_ust_app_rcu); |
| 343 | } |
| 344 | hashtable_get_next(ust_app_ht, &iter); |
| 345 | } |
| 346 | |
| 347 | rcu_read_unlock(); |
| 348 | } |
| 349 | |
| 350 | /* |
| 351 | * Init UST app hash table. |
| 352 | */ |
| 353 | void ust_app_ht_alloc(void) |
| 354 | { |
| 355 | ust_app_ht = hashtable_new(0); |
| 356 | ust_app_sock_key_map = hashtable_new(0); |
| 357 | } |
| 358 | |
| 359 | /* |
| 360 | * Alloc new UST app session. |
| 361 | */ |
| 362 | static struct ust_app_session *alloc_ust_app_session(void) |
| 363 | { |
| 364 | struct ust_app_session *ua_sess; |
| 365 | |
| 366 | /* Init most of the default value by allocating and zeroing */ |
| 367 | ua_sess = zmalloc(sizeof(struct ust_app_session)); |
| 368 | if (ua_sess == NULL) { |
| 369 | PERROR("malloc"); |
| 370 | goto error; |
| 371 | } |
| 372 | |
| 373 | ua_sess->handle = -1; |
| 374 | ua_sess->channels = hashtable_new_str(0); |
| 375 | |
| 376 | return ua_sess; |
| 377 | |
| 378 | error: |
| 379 | return NULL; |
| 380 | } |
| 381 | |
| 382 | /* |
| 383 | * Alloc new UST app channel. |
| 384 | */ |
| 385 | static struct ust_app_channel *alloc_ust_app_channel(char *name) |
| 386 | { |
| 387 | struct ust_app_channel *ua_chan; |
| 388 | |
| 389 | /* Init most of the default value by allocating and zeroing */ |
| 390 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); |
| 391 | if (ua_chan == NULL) { |
| 392 | PERROR("malloc"); |
| 393 | goto error; |
| 394 | } |
| 395 | |
| 396 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); |
| 397 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; |
| 398 | ua_chan->handle = -1; |
| 399 | ua_chan->ctx = hashtable_new(0); |
| 400 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); |
| 401 | ua_chan->events = hashtable_new_str(0); |
| 402 | hashtable_node_init(&ua_chan->node, (void *) ua_chan->name, |
| 403 | strlen(ua_chan->name)); |
| 404 | |
| 405 | DBG3("UST app channel %s allocated", ua_chan->name); |
| 406 | |
| 407 | return ua_chan; |
| 408 | |
| 409 | error: |
| 410 | return NULL; |
| 411 | } |
| 412 | |
| 413 | /* |
| 414 | * Alloc new UST app event. |
| 415 | */ |
| 416 | static struct ust_app_event *alloc_ust_app_event(char *name) |
| 417 | { |
| 418 | struct ust_app_event *ua_event; |
| 419 | |
| 420 | /* Init most of the default value by allocating and zeroing */ |
| 421 | ua_event = zmalloc(sizeof(struct ust_app_event)); |
| 422 | if (ua_event == NULL) { |
| 423 | PERROR("malloc"); |
| 424 | goto error; |
| 425 | } |
| 426 | |
| 427 | strncpy(ua_event->name, name, sizeof(ua_event->name)); |
| 428 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; |
| 429 | ua_event->ctx = hashtable_new(0); |
| 430 | hashtable_node_init(&ua_event->node, (void *) ua_event->name, |
| 431 | strlen(ua_event->name)); |
| 432 | |
| 433 | DBG3("UST app event %s allocated", ua_event->name); |
| 434 | |
| 435 | return ua_event; |
| 436 | |
| 437 | error: |
| 438 | return NULL; |
| 439 | } |
| 440 | |
| 441 | static void shadow_copy_event(struct ust_app_event *ua_event, |
| 442 | struct ltt_ust_event *uevent) |
| 443 | { |
| 444 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
| 445 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; |
| 446 | |
| 447 | /* TODO: support copy context */ |
| 448 | } |
| 449 | |
| 450 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
| 451 | struct ltt_ust_channel *uchan) |
| 452 | { |
| 453 | struct cds_lfht_iter iter; |
| 454 | struct cds_lfht_node *node, *ua_event_node; |
| 455 | struct ltt_ust_event *uevent; |
| 456 | struct ust_app_event *ua_event; |
| 457 | |
| 458 | DBG2("Shadow copy of UST app channel %s", ua_chan->name); |
| 459 | |
| 460 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); |
| 461 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; |
| 462 | |
| 463 | /* TODO: support copy context */ |
| 464 | |
| 465 | /* Copy all events from ltt ust channel to ust app channel */ |
| 466 | hashtable_get_first(uchan->events, &iter); |
| 467 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { |
| 468 | uevent = caa_container_of(node, struct ltt_ust_event, node); |
| 469 | |
| 470 | ua_event_node = hashtable_lookup(ua_chan->events, |
| 471 | (void *) uevent->attr.name, strlen(uevent->attr.name), &iter); |
| 472 | if (ua_event_node == NULL) { |
| 473 | DBG2("UST event %s not found on shadow copy channel", |
| 474 | uevent->attr.name); |
| 475 | ua_event = alloc_ust_app_event(uevent->attr.name); |
| 476 | if (ua_event == NULL) { |
| 477 | goto next; |
| 478 | } |
| 479 | shadow_copy_event(ua_event, uevent); |
| 480 | hashtable_add_unique(ua_chan->events, &ua_event->node); |
| 481 | } |
| 482 | |
| 483 | next: |
| 484 | /* Get next UST events */ |
| 485 | hashtable_get_next(uchan->events, &iter); |
| 486 | } |
| 487 | |
| 488 | DBG3("Shadow copy channel done"); |
| 489 | } |
| 490 | |
| 491 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
| 492 | struct ltt_ust_session *usess) |
| 493 | { |
| 494 | struct cds_lfht_node *node, *ua_chan_node; |
| 495 | struct cds_lfht_iter iter; |
| 496 | struct ltt_ust_channel *uchan; |
| 497 | struct ust_app_channel *ua_chan; |
| 498 | |
| 499 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
| 500 | |
| 501 | ua_sess->uid = usess->uid; |
| 502 | |
| 503 | /* TODO: support all UST domain */ |
| 504 | |
| 505 | /* Iterate over all channels in global domain. */ |
| 506 | hashtable_get_first(usess->domain_global.channels, &iter); |
| 507 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { |
| 508 | uchan = caa_container_of(node, struct ltt_ust_channel, node); |
| 509 | |
| 510 | ua_chan_node = hashtable_lookup(ua_sess->channels, |
| 511 | (void *)uchan->name, strlen(uchan->name), &iter); |
| 512 | if (ua_chan_node == NULL) { |
| 513 | DBG2("Channel %s not found on shadow session copy, creating it", |
| 514 | uchan->name); |
| 515 | ua_chan = alloc_ust_app_channel(uchan->name); |
| 516 | if (ua_chan == NULL) { |
| 517 | /* malloc failed... continuing */ |
| 518 | goto next; |
| 519 | } |
| 520 | |
| 521 | shadow_copy_channel(ua_chan, uchan); |
| 522 | hashtable_add_unique(ua_sess->channels, &ua_chan->node); |
| 523 | } |
| 524 | |
| 525 | next: |
| 526 | /* Next item in hash table */ |
| 527 | hashtable_get_next(usess->domain_global.channels, &iter); |
| 528 | } |
| 529 | } |
| 530 | |
| 531 | /* |
| 532 | * Return ust app session from the app session hashtable using the UST session |
| 533 | * uid. |
| 534 | */ |
| 535 | static struct ust_app_session *lookup_session_by_app( |
| 536 | struct ltt_ust_session *usess, struct ust_app *app) |
| 537 | { |
| 538 | struct cds_lfht_iter iter; |
| 539 | struct cds_lfht_node *node; |
| 540 | |
| 541 | /* Get right UST app session from app */ |
| 542 | node = hashtable_lookup(app->sessions, |
| 543 | (void *) ((unsigned long) usess->uid), sizeof(void *), &iter); |
| 544 | if (node == NULL) { |
| 545 | goto error; |
| 546 | } |
| 547 | |
| 548 | return caa_container_of(node, struct ust_app_session, node); |
| 549 | |
| 550 | error: |
| 551 | return NULL; |
| 552 | } |
| 553 | |
| 554 | /* |
| 555 | * Create a UST session onto the tracer of app and add it the session |
| 556 | * hashtable. |
| 557 | * |
| 558 | * Return ust app session or NULL on error. |
| 559 | */ |
| 560 | static struct ust_app_session *create_ust_app_session( |
| 561 | struct ltt_ust_session *usess, struct ust_app *app) |
| 562 | { |
| 563 | int ret; |
| 564 | struct ust_app_session *ua_sess; |
| 565 | |
| 566 | ua_sess = lookup_session_by_app(usess, app); |
| 567 | if (ua_sess == NULL) { |
| 568 | DBG2("UST app pid: %d session uid %d not found, creating it", |
| 569 | app->key.pid, usess->uid); |
| 570 | ua_sess = alloc_ust_app_session(); |
| 571 | if (ua_sess == NULL) { |
| 572 | /* Only malloc can failed so something is really wrong */ |
| 573 | goto error; |
| 574 | } |
| 575 | shadow_copy_session(ua_sess, usess); |
| 576 | } |
| 577 | |
| 578 | if (ua_sess->handle == -1) { |
| 579 | ret = ustctl_create_session(app->key.sock); |
| 580 | if (ret < 0) { |
| 581 | ERR("Error creating session for app pid %d, sock %d", |
| 582 | app->key.pid, app->key.sock); |
| 583 | /* TODO: free() ua_sess */ |
| 584 | goto error; |
| 585 | } |
| 586 | |
| 587 | DBG2("UST app ustctl create session handle %d", ret); |
| 588 | ua_sess->handle = ret; |
| 589 | |
| 590 | /* Add ust app session to app's HT */ |
| 591 | hashtable_node_init(&ua_sess->node, |
| 592 | (void *)((unsigned long) ua_sess->uid), sizeof(void *)); |
| 593 | hashtable_add_unique(app->sessions, &ua_sess->node); |
| 594 | |
| 595 | DBG2("UST app session created successfully with handle %d", ret); |
| 596 | } |
| 597 | |
| 598 | return ua_sess; |
| 599 | |
| 600 | error: |
| 601 | return NULL; |
| 602 | } |
| 603 | |
| 604 | static struct ust_app_channel *create_ust_app_channel( |
| 605 | struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan, |
| 606 | struct ust_app *app) |
| 607 | { |
| 608 | int ret = 0; |
| 609 | struct cds_lfht_iter iter; |
| 610 | struct cds_lfht_node *ua_chan_node; |
| 611 | struct ust_app_channel *ua_chan; |
| 612 | |
| 613 | /* Lookup channel in the ust app session */ |
| 614 | ua_chan_node = hashtable_lookup(ua_sess->channels, |
| 615 | (void *)uchan->name, strlen(uchan->name), &iter); |
| 616 | if (ua_chan_node == NULL) { |
| 617 | DBG2("Unable to find channel %s in ust session uid %u", |
| 618 | uchan->name, ua_sess->uid); |
| 619 | ua_chan = alloc_ust_app_channel(uchan->name); |
| 620 | if (ua_chan == NULL) { |
| 621 | goto error; |
| 622 | } |
| 623 | shadow_copy_channel(ua_chan, uchan); |
| 624 | hashtable_add_unique(ua_sess->channels, &ua_chan->node); |
| 625 | } else { |
| 626 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
| 627 | } |
| 628 | |
| 629 | /* TODO: remove cast and use lttng-ust-abi.h */ |
| 630 | ret = ustctl_create_channel(app->key.sock, ua_sess->handle, |
| 631 | (struct lttng_ust_channel_attr *)&uchan->attr, &ua_chan->obj); |
| 632 | if (ret < 0) { |
| 633 | DBG("Error creating channel %s for app (pid: %d, sock: %d) " |
| 634 | "and session handle %d with ret %d", |
| 635 | ua_chan->name, app->key.pid, app->key.sock, |
| 636 | ua_sess->handle, ret); |
| 637 | goto error; |
| 638 | } |
| 639 | |
| 640 | ua_chan->handle = ua_chan->obj->handle; |
| 641 | ua_chan->attr.shm_fd = ua_chan->obj->shm_fd; |
| 642 | ua_chan->attr.wait_fd = ua_chan->obj->wait_fd; |
| 643 | ua_chan->attr.memory_map_size = ua_chan->obj->memory_map_size; |
| 644 | |
| 645 | DBG2("Channel %s UST create successfully for pid:%d and sock:%d", |
| 646 | ua_chan->name, app->key.pid, app->key.sock); |
| 647 | |
| 648 | return ua_chan; |
| 649 | |
| 650 | error: |
| 651 | return NULL; |
| 652 | } |
| 653 | |
| 654 | static struct ust_app_event *create_ust_app_event( |
| 655 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, |
| 656 | struct ltt_ust_event *uevent, struct ust_app *app) |
| 657 | { |
| 658 | int ret; |
| 659 | struct cds_lfht_iter iter; |
| 660 | struct cds_lfht_node *ua_event_node; |
| 661 | struct ust_app_event *ua_event; |
| 662 | |
| 663 | /* Get event node */ |
| 664 | ua_event_node = hashtable_lookup(ua_chan->events, |
| 665 | (void *)uevent->attr.name, strlen(uevent->attr.name), &iter); |
| 666 | if (ua_event_node == NULL) { |
| 667 | DBG2("UST app event %s not found, creating it", uevent->attr.name); |
| 668 | /* Does not exist so create one */ |
| 669 | ua_event = alloc_ust_app_event(uevent->attr.name); |
| 670 | if (ua_event == NULL) { |
| 671 | /* Only malloc can failed so something is really wrong */ |
| 672 | goto error; |
| 673 | } |
| 674 | shadow_copy_event(ua_event, uevent); |
| 675 | |
| 676 | hashtable_add_unique(ua_chan->events, &ua_event->node); |
| 677 | } else { |
| 678 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); |
| 679 | } |
| 680 | |
| 681 | /* Create UST event on tracer */ |
| 682 | ret = ustctl_create_event(app->key.sock, &uevent->attr, ua_chan->obj, |
| 683 | &ua_event->obj); |
| 684 | if (ret < 0) { |
| 685 | ERR("Error ustctl create event %s for app pid: %d with ret %d", |
| 686 | uevent->attr.name, app->key.pid, ret); |
| 687 | /* TODO: free() ua_event */ |
| 688 | goto error; |
| 689 | } |
| 690 | ua_event->handle = ua_event->obj->handle; |
| 691 | ua_event->enabled = 1; |
| 692 | |
| 693 | |
| 694 | DBG2("Event %s UST create successfully for pid:%d", uevent->attr.name, |
| 695 | app->key.pid); |
| 696 | |
| 697 | return ua_event; |
| 698 | |
| 699 | error: |
| 700 | return NULL; |
| 701 | } |
| 702 | |
| 703 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, |
| 704 | char *pathname, struct ust_app *app) |
| 705 | { |
| 706 | int ret = 0; |
| 707 | struct lttng_ust_channel_attr uattr; |
| 708 | |
| 709 | if (ua_sess->metadata == NULL) { |
| 710 | /* Allocate UST metadata */ |
| 711 | ua_sess->metadata = trace_ust_create_metadata(pathname); |
| 712 | if (ua_sess->metadata == NULL) { |
| 713 | ERR("UST app session %d creating metadata failed", |
| 714 | ua_sess->handle); |
| 715 | goto error; |
| 716 | } |
| 717 | |
| 718 | uattr.overwrite = ua_sess->metadata->attr.overwrite; |
| 719 | uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size; |
| 720 | uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf; |
| 721 | uattr.switch_timer_interval = |
| 722 | ua_sess->metadata->attr.switch_timer_interval; |
| 723 | uattr.read_timer_interval = |
| 724 | ua_sess->metadata->attr.read_timer_interval; |
| 725 | uattr.output = ua_sess->metadata->attr.output; |
| 726 | |
| 727 | /* UST tracer metadata creation */ |
| 728 | ret = ustctl_open_metadata(app->key.sock, ua_sess->handle, &uattr, |
| 729 | &ua_sess->metadata->obj); |
| 730 | if (ret < 0) { |
| 731 | ERR("UST app open metadata failed for app pid:%d", |
| 732 | app->key.pid); |
| 733 | goto error; |
| 734 | } |
| 735 | |
| 736 | DBG2("UST metadata opened for app pid %d", app->key.pid); |
| 737 | } |
| 738 | |
| 739 | /* Open UST metadata stream */ |
| 740 | if (ua_sess->metadata->stream_obj == NULL) { |
| 741 | ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj, |
| 742 | &ua_sess->metadata->stream_obj); |
| 743 | if (ret < 0) { |
| 744 | ERR("UST create metadata stream failed"); |
| 745 | goto error; |
| 746 | } |
| 747 | |
| 748 | ret = snprintf(ua_sess->metadata->pathname, PATH_MAX, "%s/%s-%d", |
| 749 | pathname, app->name, app->key.pid); |
| 750 | if (ret < 0) { |
| 751 | PERROR("asprintf UST create stream"); |
| 752 | goto error; |
| 753 | } |
| 754 | |
| 755 | ret = mkdir(ua_sess->metadata->pathname, S_IRWXU | S_IRWXG); |
| 756 | if (ret < 0) { |
| 757 | PERROR("mkdir UST metadata"); |
| 758 | goto error; |
| 759 | } |
| 760 | |
| 761 | ret = snprintf(ua_sess->metadata->pathname, PATH_MAX, "%s/%s-%d/metadata", |
| 762 | pathname, app->name, app->key.pid); |
| 763 | if (ret < 0) { |
| 764 | PERROR("asprintf UST create stream"); |
| 765 | goto error; |
| 766 | } |
| 767 | |
| 768 | DBG2("UST metadata stream object created for app pid %d", |
| 769 | app->key.pid); |
| 770 | } |
| 771 | |
| 772 | return 0; |
| 773 | |
| 774 | error: |
| 775 | return -1; |
| 776 | } |
| 777 | |
| 778 | /* |
| 779 | * Add channel to all ust app session. |
| 780 | */ |
| 781 | int ust_app_add_channel_all(struct ltt_ust_session *usess, |
| 782 | struct ltt_ust_channel *uchan) |
| 783 | { |
| 784 | int ret = 0; |
| 785 | struct cds_lfht_iter iter; |
| 786 | struct cds_lfht_node *node; |
| 787 | struct ust_app *app; |
| 788 | struct ust_app_session *ua_sess; |
| 789 | struct ust_app_channel *ua_chan; |
| 790 | |
| 791 | if (usess == NULL || uchan == NULL) { |
| 792 | ERR("Adding UST global channel to NULL values"); |
| 793 | ret = -1; |
| 794 | goto error; |
| 795 | } |
| 796 | |
| 797 | DBG2("UST app adding channel %s to global domain for session uid %d", |
| 798 | uchan->name, usess->uid); |
| 799 | |
| 800 | rcu_read_lock(); |
| 801 | |
| 802 | /* For every UST applications registered */ |
| 803 | hashtable_get_first(ust_app_ht, &iter); |
| 804 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { |
| 805 | app = caa_container_of(node, struct ust_app, node); |
| 806 | |
| 807 | /* Create session on the tracer side and add it to app session HT */ |
| 808 | ua_sess = create_ust_app_session(usess, app); |
| 809 | if (ua_sess == NULL) { |
| 810 | goto next; |
| 811 | } |
| 812 | |
| 813 | /* Create channel onto application */ |
| 814 | ua_chan = create_ust_app_channel(ua_sess, uchan, app); |
| 815 | if (ua_chan == NULL) { |
| 816 | goto next; |
| 817 | } |
| 818 | |
| 819 | next: |
| 820 | /* Next applications */ |
| 821 | hashtable_get_next(ust_app_ht, &iter); |
| 822 | } |
| 823 | rcu_read_unlock(); |
| 824 | |
| 825 | error: |
| 826 | return ret; |
| 827 | } |
| 828 | |
| 829 | int ust_app_add_event_all(struct ltt_ust_session *usess, |
| 830 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
| 831 | { |
| 832 | int ret = 0; |
| 833 | struct cds_lfht_iter iter; |
| 834 | struct cds_lfht_node *node, *ua_chan_node; |
| 835 | struct ust_app *app; |
| 836 | struct ust_app_session *ua_sess; |
| 837 | struct ust_app_channel *ua_chan; |
| 838 | struct ust_app_event *ua_event; |
| 839 | |
| 840 | DBG2("UST app adding event %s to global domain for session uid %d", |
| 841 | uevent->attr.name, usess->uid); |
| 842 | |
| 843 | rcu_read_lock(); |
| 844 | |
| 845 | /* For all registered applications */ |
| 846 | hashtable_get_first(ust_app_ht, &iter); |
| 847 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { |
| 848 | app = caa_container_of(node, struct ust_app, node); |
| 849 | |
| 850 | /* Create session on the tracer side and add it to app session HT */ |
| 851 | ua_sess = create_ust_app_session(usess, app); |
| 852 | if (ua_sess == NULL) { |
| 853 | goto next; |
| 854 | } |
| 855 | |
| 856 | /* Lookup channel in the ust app session */ |
| 857 | ua_chan_node = hashtable_lookup(ua_sess->channels, |
| 858 | (void *)uchan->name, strlen(uchan->name), &iter); |
| 859 | if (ua_chan_node == NULL) { |
| 860 | ERR("Channel %s not found in session uid %d. Skipping", |
| 861 | uchan->name, usess->uid); |
| 862 | goto next; |
| 863 | } |
| 864 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
| 865 | |
| 866 | ua_event = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
| 867 | if (ua_event == NULL) { |
| 868 | goto next; |
| 869 | } |
| 870 | |
| 871 | next: |
| 872 | /* Next applications */ |
| 873 | hashtable_get_next(ust_app_ht, &iter); |
| 874 | } |
| 875 | rcu_read_unlock(); |
| 876 | |
| 877 | return ret; |
| 878 | } |
| 879 | |
| 880 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
| 881 | { |
| 882 | int ret = 0; |
| 883 | struct cds_lfht_iter iter; |
| 884 | struct cds_lfht_node *node; |
| 885 | struct ust_app_session *ua_sess; |
| 886 | struct ust_app_channel *ua_chan; |
| 887 | |
| 888 | DBG("Starting tracing for ust app pid %d", app->key.pid); |
| 889 | |
| 890 | rcu_read_lock(); |
| 891 | |
| 892 | ua_sess = lookup_session_by_app(usess, app); |
| 893 | if (ua_sess == NULL) { |
| 894 | /* Only malloc can failed so something is really wrong */ |
| 895 | goto error_rcu_unlock; |
| 896 | } |
| 897 | |
| 898 | ret = create_ust_app_metadata(ua_sess, usess->pathname, app); |
| 899 | if (ret < 0) { |
| 900 | goto error_rcu_unlock; |
| 901 | } |
| 902 | |
| 903 | /* For each channel */ |
| 904 | hashtable_get_first(ua_sess->channels, &iter); |
| 905 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { |
| 906 | ua_chan = caa_container_of(node, struct ust_app_channel, node); |
| 907 | |
| 908 | /* Create all streams */ |
| 909 | while (1) { |
| 910 | struct ltt_ust_stream *ustream; |
| 911 | |
| 912 | ustream = zmalloc(sizeof(*ustream)); |
| 913 | if (ustream == NULL) { |
| 914 | PERROR("zmalloc ust stream"); |
| 915 | goto error_rcu_unlock; |
| 916 | } |
| 917 | |
| 918 | ret = ustctl_create_stream(app->key.sock, ua_chan->obj, |
| 919 | &ustream->obj); |
| 920 | if (ret < 0) { |
| 921 | /* Got all streams */ |
| 922 | break; |
| 923 | } |
| 924 | ustream->handle = ustream->obj->handle; |
| 925 | |
| 926 | /* Order is important */ |
| 927 | cds_list_add_tail(&ustream->list, &ua_chan->streams.head); |
| 928 | ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s-%d/%s_%u", |
| 929 | usess->pathname, app->name, app->key.pid, |
| 930 | ua_chan->name, ua_chan->streams.count++); |
| 931 | if (ret < 0) { |
| 932 | PERROR("asprintf UST create stream"); |
| 933 | continue; |
| 934 | } |
| 935 | DBG2("UST stream %d ready at %s", ua_chan->streams.count, |
| 936 | ustream->pathname); |
| 937 | } |
| 938 | |
| 939 | /* Next applications */ |
| 940 | hashtable_get_next(ua_sess->channels, &iter); |
| 941 | } |
| 942 | |
| 943 | /* Setup UST consumer socket and send fds to it */ |
| 944 | ret = ust_consumer_send_session(usess->consumer_fd, ua_sess); |
| 945 | if (ret < 0) { |
| 946 | goto error_rcu_unlock; |
| 947 | } |
| 948 | |
| 949 | /* This start the UST tracing */ |
| 950 | ret = ustctl_start_session(app->key.sock, ua_sess->handle); |
| 951 | if (ret < 0) { |
| 952 | ERR("Error starting tracing for app pid: %d", app->key.pid); |
| 953 | goto error_rcu_unlock; |
| 954 | } |
| 955 | rcu_read_unlock(); |
| 956 | |
| 957 | /* Quiescent wait after starting trace */ |
| 958 | ustctl_wait_quiescent(app->key.sock); |
| 959 | |
| 960 | return 0; |
| 961 | |
| 962 | error_rcu_unlock: |
| 963 | rcu_read_unlock(); |
| 964 | return -1; |
| 965 | } |
| 966 | |
| 967 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
| 968 | { |
| 969 | int ret = 0; |
| 970 | struct cds_lfht_iter iter; |
| 971 | struct cds_lfht_node *node; |
| 972 | struct ust_app *app; |
| 973 | |
| 974 | DBG("Starting all UST traces"); |
| 975 | |
| 976 | rcu_read_lock(); |
| 977 | hashtable_get_first(ust_app_ht, &iter); |
| 978 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { |
| 979 | app = caa_container_of(node, struct ust_app, node); |
| 980 | |
| 981 | ret = ust_app_start_trace(usess, app); |
| 982 | if (ret < 0) { |
| 983 | goto next; |
| 984 | } |
| 985 | |
| 986 | next: |
| 987 | /* Next applications */ |
| 988 | hashtable_get_next(ust_app_ht, &iter); |
| 989 | } |
| 990 | rcu_read_unlock(); |
| 991 | |
| 992 | return 0; |
| 993 | } |
| 994 | |
| 995 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
| 996 | { |
| 997 | int ret = 0; |
| 998 | struct cds_lfht_iter iter; |
| 999 | struct cds_lfht_node *node; |
| 1000 | struct ust_app *app; |
| 1001 | struct ust_app_session *ua_sess; |
| 1002 | struct ust_app_channel *ua_chan; |
| 1003 | struct ust_app_event *ua_event; |
| 1004 | struct ltt_ust_channel *uchan; |
| 1005 | struct ltt_ust_event *uevent; |
| 1006 | |
| 1007 | rcu_read_lock(); |
| 1008 | |
| 1009 | if (usess == NULL) { |
| 1010 | DBG2("No UST session on global update. Returning"); |
| 1011 | goto error; |
| 1012 | } |
| 1013 | |
| 1014 | DBG2("UST app global update for app sock %d for session uid %d", sock, |
| 1015 | usess->uid); |
| 1016 | |
| 1017 | app = find_app_by_sock(sock); |
| 1018 | if (app == NULL) { |
| 1019 | ERR("Failed to update app sock %d", sock); |
| 1020 | goto error; |
| 1021 | } |
| 1022 | |
| 1023 | ua_sess = create_ust_app_session(usess, app); |
| 1024 | if (ua_sess == NULL) { |
| 1025 | goto error; |
| 1026 | } |
| 1027 | |
| 1028 | hashtable_get_first(usess->domain_global.channels, &iter); |
| 1029 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { |
| 1030 | uchan = caa_container_of(node, struct ltt_ust_channel, node); |
| 1031 | |
| 1032 | ua_chan = create_ust_app_channel(ua_sess, uchan, app); |
| 1033 | if (ua_chan == NULL) { |
| 1034 | goto next_chan; |
| 1035 | } |
| 1036 | |
| 1037 | hashtable_get_first(uchan->events, &iter); |
| 1038 | while ((node = hashtable_iter_get_node(&iter)) != NULL) { |
| 1039 | uevent = caa_container_of(node, struct ltt_ust_event, node); |
| 1040 | |
| 1041 | ua_event = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
| 1042 | if (ua_event == NULL) { |
| 1043 | goto next_event; |
| 1044 | } |
| 1045 | |
| 1046 | next_event: |
| 1047 | hashtable_get_next(uchan->events, &iter); |
| 1048 | } |
| 1049 | |
| 1050 | next_chan: |
| 1051 | /* Next item in hash table */ |
| 1052 | hashtable_get_next(usess->domain_global.channels, &iter); |
| 1053 | } |
| 1054 | |
| 1055 | if (usess->start_trace) { |
| 1056 | ret = ust_app_start_trace(usess, app); |
| 1057 | if (ret < 0) { |
| 1058 | goto error; |
| 1059 | } |
| 1060 | |
| 1061 | DBG2("UST trace started for app pid %d", app->key.pid); |
| 1062 | } |
| 1063 | |
| 1064 | error: |
| 1065 | rcu_read_unlock(); |
| 1066 | return; |
| 1067 | } |