| 1 | /* |
| 2 | * ltt-probes.c |
| 3 | * |
| 4 | * Copyright 2010 (c) - Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 5 | * |
| 6 | * Holds LTTng probes registry. |
| 7 | * |
| 8 | * Dual LGPL v2.1/GPL v2 license. |
| 9 | */ |
| 10 | |
| 11 | #include <string.h> |
| 12 | #include <errno.h> |
| 13 | #include <urcu/list.h> |
| 14 | #include <urcu/hlist.h> |
| 15 | #include <lttng/ust-events.h> |
| 16 | #include <assert.h> |
| 17 | #include <helper.h> |
| 18 | #include <ctype.h> |
| 19 | |
| 20 | #include "ltt-tracer-core.h" |
| 21 | #include "jhash.h" |
| 22 | #include "error.h" |
| 23 | |
| 24 | /* |
| 25 | * probe list is protected by ust_lock()/ust_unlock(). |
| 26 | */ |
| 27 | static CDS_LIST_HEAD(probe_list); |
| 28 | |
| 29 | /* |
| 30 | * Loglevel hash table, containing the active loglevels. |
| 31 | * Protected by ust lock. |
| 32 | */ |
| 33 | #define LOGLEVEL_HASH_BITS 6 |
| 34 | #define LOGLEVEL_TABLE_SIZE (1 << LOGLEVEL_HASH_BITS) |
| 35 | static struct cds_hlist_head loglevel_table[LOGLEVEL_TABLE_SIZE]; |
| 36 | |
| 37 | /* |
| 38 | * Wildcard list, containing the active wildcards. |
| 39 | * Protected by ust lock. |
| 40 | */ |
| 41 | static CDS_LIST_HEAD(wildcard_list); |
| 42 | |
| 43 | static |
| 44 | const struct lttng_probe_desc *find_provider(const char *provider) |
| 45 | { |
| 46 | struct lttng_probe_desc *iter; |
| 47 | |
| 48 | cds_list_for_each_entry(iter, &probe_list, head) { |
| 49 | if (!strcmp(iter->provider, provider)) |
| 50 | return iter; |
| 51 | } |
| 52 | return NULL; |
| 53 | } |
| 54 | |
| 55 | static |
| 56 | const struct lttng_event_desc *find_event(const char *name) |
| 57 | { |
| 58 | struct lttng_probe_desc *probe_desc; |
| 59 | int i; |
| 60 | |
| 61 | cds_list_for_each_entry(probe_desc, &probe_list, head) { |
| 62 | for (i = 0; i < probe_desc->nr_events; i++) { |
| 63 | if (!strcmp(probe_desc->event_desc[i]->name, name)) |
| 64 | return probe_desc->event_desc[i]; |
| 65 | } |
| 66 | } |
| 67 | return NULL; |
| 68 | } |
| 69 | |
| 70 | int ltt_probe_register(struct lttng_probe_desc *desc) |
| 71 | { |
| 72 | struct lttng_probe_desc *iter; |
| 73 | int ret = 0; |
| 74 | int i; |
| 75 | |
| 76 | ust_lock(); |
| 77 | if (find_provider(desc->provider)) { |
| 78 | ret = -EEXIST; |
| 79 | goto end; |
| 80 | } |
| 81 | /* |
| 82 | * TODO: This is O(N^2). Turn into a hash table when probe registration |
| 83 | * overhead becomes an issue. |
| 84 | */ |
| 85 | for (i = 0; i < desc->nr_events; i++) { |
| 86 | if (find_event(desc->event_desc[i]->name)) { |
| 87 | ret = -EEXIST; |
| 88 | goto end; |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | /* |
| 93 | * We sort the providers by struct lttng_probe_desc pointer |
| 94 | * address. |
| 95 | */ |
| 96 | cds_list_for_each_entry_reverse(iter, &probe_list, head) { |
| 97 | BUG_ON(iter == desc); /* Should never be in the list twice */ |
| 98 | if (iter < desc) { |
| 99 | /* We belong to the location right after iter. */ |
| 100 | cds_list_add(&desc->head, &iter->head); |
| 101 | goto desc_added; |
| 102 | } |
| 103 | } |
| 104 | /* We should be added at the head of the list */ |
| 105 | cds_list_add(&desc->head, &probe_list); |
| 106 | desc_added: |
| 107 | |
| 108 | /* |
| 109 | * fix the events awaiting probe load. |
| 110 | */ |
| 111 | for (i = 0; i < desc->nr_events; i++) { |
| 112 | ret = pending_probe_fix_events(desc->event_desc[i]); |
| 113 | assert(!ret); |
| 114 | } |
| 115 | end: |
| 116 | ust_unlock(); |
| 117 | return ret; |
| 118 | } |
| 119 | |
| 120 | void ltt_probe_unregister(struct lttng_probe_desc *desc) |
| 121 | { |
| 122 | ust_lock(); |
| 123 | cds_list_del(&desc->head); |
| 124 | ust_unlock(); |
| 125 | } |
| 126 | |
| 127 | /* |
| 128 | * called with UST lock held. |
| 129 | */ |
| 130 | const struct lttng_event_desc *ltt_event_get(const char *name) |
| 131 | { |
| 132 | const struct lttng_event_desc *event; |
| 133 | |
| 134 | event = find_event(name); |
| 135 | if (!event) |
| 136 | return NULL; |
| 137 | return event; |
| 138 | } |
| 139 | |
| 140 | void ltt_event_put(const struct lttng_event_desc *event) |
| 141 | { |
| 142 | } |
| 143 | |
| 144 | void ltt_probes_prune_event_list(struct lttng_ust_tracepoint_list *list) |
| 145 | { |
| 146 | struct tp_list_entry *list_entry, *tmp; |
| 147 | |
| 148 | cds_list_for_each_entry_safe(list_entry, tmp, &list->head, head) { |
| 149 | cds_list_del(&list_entry->head); |
| 150 | free(list_entry); |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | /* |
| 155 | * called with UST lock held. |
| 156 | */ |
| 157 | int ltt_probes_get_event_list(struct lttng_ust_tracepoint_list *list) |
| 158 | { |
| 159 | struct lttng_probe_desc *probe_desc; |
| 160 | int i; |
| 161 | |
| 162 | CDS_INIT_LIST_HEAD(&list->head); |
| 163 | cds_list_for_each_entry(probe_desc, &probe_list, head) { |
| 164 | for (i = 0; i < probe_desc->nr_events; i++) { |
| 165 | struct tp_list_entry *list_entry; |
| 166 | |
| 167 | list_entry = zmalloc(sizeof(*list_entry)); |
| 168 | if (!list_entry) |
| 169 | goto err_nomem; |
| 170 | cds_list_add(&list_entry->head, &list->head); |
| 171 | strncpy(list_entry->tp.name, |
| 172 | probe_desc->event_desc[i]->name, |
| 173 | LTTNG_UST_SYM_NAME_LEN); |
| 174 | list_entry->tp.name[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; |
| 175 | if (!probe_desc->event_desc[i]->loglevel) { |
| 176 | list_entry->tp.loglevel[0] = '\0'; |
| 177 | list_entry->tp.loglevel_value = 0; |
| 178 | } else { |
| 179 | strncpy(list_entry->tp.loglevel, |
| 180 | (*probe_desc->event_desc[i]->loglevel)->identifier, |
| 181 | LTTNG_UST_SYM_NAME_LEN); |
| 182 | list_entry->tp.loglevel[LTTNG_UST_SYM_NAME_LEN - 1] = '\0'; |
| 183 | list_entry->tp.loglevel_value = |
| 184 | (*probe_desc->event_desc[i]->loglevel)->value; |
| 185 | } |
| 186 | } |
| 187 | } |
| 188 | if (cds_list_empty(&list->head)) |
| 189 | list->iter = NULL; |
| 190 | else |
| 191 | list->iter = |
| 192 | cds_list_first_entry(&list->head, struct tp_list_entry, head); |
| 193 | return 0; |
| 194 | |
| 195 | err_nomem: |
| 196 | ltt_probes_prune_event_list(list); |
| 197 | return -ENOMEM; |
| 198 | } |
| 199 | |
| 200 | /* |
| 201 | * Return current iteration position, advance internal iterator to next. |
| 202 | * Return NULL if end of list. |
| 203 | */ |
| 204 | struct lttng_ust_tracepoint_iter * |
| 205 | lttng_ust_tracepoint_list_get_iter_next(struct lttng_ust_tracepoint_list *list) |
| 206 | { |
| 207 | struct tp_list_entry *entry; |
| 208 | |
| 209 | if (!list->iter) |
| 210 | return NULL; |
| 211 | entry = list->iter; |
| 212 | if (entry->head.next == &list->head) |
| 213 | list->iter = NULL; |
| 214 | else |
| 215 | list->iter = cds_list_entry(entry->head.next, |
| 216 | struct tp_list_entry, head); |
| 217 | return &entry->tp; |
| 218 | } |
| 219 | |
| 220 | /* |
| 221 | * Get loglevel if the loglevel is present in the loglevel hash table. |
| 222 | * Must be called with ust lock held. |
| 223 | * Returns NULL if not present. |
| 224 | */ |
| 225 | struct loglevel_entry *get_loglevel(const char *name) |
| 226 | { |
| 227 | struct cds_hlist_head *head; |
| 228 | struct cds_hlist_node *node; |
| 229 | struct loglevel_entry *e; |
| 230 | uint32_t hash = jhash(name, strlen(name), 0); |
| 231 | |
| 232 | head = &loglevel_table[hash & (LOGLEVEL_TABLE_SIZE - 1)]; |
| 233 | cds_hlist_for_each_entry(e, node, head, hlist) { |
| 234 | if (!strcmp(name, e->name)) |
| 235 | return e; |
| 236 | } |
| 237 | return NULL; |
| 238 | } |
| 239 | |
| 240 | struct loglevel_entry *get_loglevel_value(int64_t value) |
| 241 | { |
| 242 | char name[LTTNG_UST_SYM_NAME_LEN]; |
| 243 | int ret; |
| 244 | |
| 245 | ret = snprintf(name, LTTNG_UST_SYM_NAME_LEN, "%lld", (long long) value); |
| 246 | if (ret < 0) |
| 247 | return NULL; |
| 248 | return get_loglevel(name); |
| 249 | } |
| 250 | |
| 251 | /* |
| 252 | * marshall all probes/all events and create those that fit the |
| 253 | * loglevel. Add them to the events list as created. |
| 254 | */ |
| 255 | static |
| 256 | void _probes_create_loglevel_events(struct loglevel_entry *entry, |
| 257 | struct session_loglevel *loglevel) |
| 258 | { |
| 259 | struct lttng_probe_desc *probe_desc; |
| 260 | struct lttng_ust_event event_param; |
| 261 | int i; |
| 262 | |
| 263 | cds_list_for_each_entry(probe_desc, &probe_list, head) { |
| 264 | for (i = 0; i < probe_desc->nr_events; i++) { |
| 265 | const struct tracepoint_loglevel_entry *ev_ll; |
| 266 | const struct lttng_event_desc *event_desc; |
| 267 | int match = 0; |
| 268 | |
| 269 | event_desc = probe_desc->event_desc[i]; |
| 270 | if (!(event_desc->loglevel)) |
| 271 | continue; |
| 272 | ev_ll = *event_desc->loglevel; |
| 273 | if (isdigit(entry->name[0])) { |
| 274 | if (atoll(entry->name) == ev_ll->value) { |
| 275 | match = 1; |
| 276 | } |
| 277 | } else if (!strcmp(ev_ll->identifier, entry->name)) { |
| 278 | match = 1; |
| 279 | } |
| 280 | |
| 281 | if (match) { |
| 282 | struct ltt_event *ev; |
| 283 | int ret; |
| 284 | |
| 285 | memcpy(&event_param, &loglevel->event_param, |
| 286 | sizeof(event_param)); |
| 287 | memcpy(event_param.name, |
| 288 | event_desc->name, |
| 289 | sizeof(event_param.name)); |
| 290 | /* create event */ |
| 291 | ret = ltt_event_create(loglevel->chan, |
| 292 | &event_param, NULL, |
| 293 | &ev); |
| 294 | if (ret) { |
| 295 | DBG("Error creating event"); |
| 296 | continue; |
| 297 | } |
| 298 | cds_list_add(&ev->loglevel_list, |
| 299 | &loglevel->events); |
| 300 | } |
| 301 | } |
| 302 | } |
| 303 | } |
| 304 | |
| 305 | /* |
| 306 | * Add the loglevel to the loglevel hash table. Must be called with |
| 307 | * ust lock held. |
| 308 | */ |
| 309 | struct session_loglevel *add_loglevel(const char *name, |
| 310 | struct ltt_channel *chan, |
| 311 | struct lttng_ust_event *event_param) |
| 312 | { |
| 313 | struct cds_hlist_head *head; |
| 314 | struct cds_hlist_node *node; |
| 315 | struct loglevel_entry *e; |
| 316 | struct session_loglevel *sl; |
| 317 | size_t name_len = strlen(name) + 1; |
| 318 | uint32_t hash = jhash(name, name_len-1, 0); |
| 319 | int found = 0; |
| 320 | |
| 321 | /* loglevel entry */ |
| 322 | head = &loglevel_table[hash & (LOGLEVEL_TABLE_SIZE - 1)]; |
| 323 | cds_hlist_for_each_entry(e, node, head, hlist) { |
| 324 | if (!strcmp(name, e->name)) { |
| 325 | found = 1; |
| 326 | break; |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | if (!found) { |
| 331 | /* |
| 332 | * Using zmalloc here to allocate a variable length element. Could |
| 333 | * cause some memory fragmentation if overused. |
| 334 | */ |
| 335 | e = zmalloc(sizeof(struct loglevel_entry) + name_len); |
| 336 | if (!e) |
| 337 | return ERR_PTR(-ENOMEM); |
| 338 | memcpy(&e->name[0], name, name_len); |
| 339 | cds_hlist_add_head(&e->hlist, head); |
| 340 | CDS_INIT_LIST_HEAD(&e->session_list); |
| 341 | } |
| 342 | |
| 343 | /* session loglevel */ |
| 344 | cds_list_for_each_entry(sl, &e->session_list, session_list) { |
| 345 | if (chan == sl->chan) { |
| 346 | DBG("loglevel %s busy for this channel", name); |
| 347 | return ERR_PTR(-EEXIST); /* Already there */ |
| 348 | } |
| 349 | } |
| 350 | sl = zmalloc(sizeof(struct session_loglevel)); |
| 351 | if (!sl) |
| 352 | return ERR_PTR(-ENOMEM); |
| 353 | sl->chan = chan; |
| 354 | sl->enabled = 1; |
| 355 | memcpy(&sl->event_param, event_param, sizeof(sl->event_param)); |
| 356 | sl->event_param.instrumentation = LTTNG_UST_TRACEPOINT; |
| 357 | CDS_INIT_LIST_HEAD(&sl->events); |
| 358 | cds_list_add(&sl->list, &chan->session->loglevels); |
| 359 | cds_list_add(&sl->session_list, &e->session_list); |
| 360 | sl->entry = e; |
| 361 | _probes_create_loglevel_events(e, sl); |
| 362 | return sl; |
| 363 | } |
| 364 | |
| 365 | /* |
| 366 | * Remove the loglevel from the loglevel hash table. Must be called with |
| 367 | * ust_lock held. Only called at session teardown. |
| 368 | */ |
| 369 | void _remove_loglevel(struct session_loglevel *loglevel) |
| 370 | { |
| 371 | struct ltt_event *ev, *tmp; |
| 372 | |
| 373 | /* |
| 374 | * Just remove the events owned (for enable/disable) by this |
| 375 | * loglevel from the list. The session teardown will take care |
| 376 | * of freeing the event memory. |
| 377 | */ |
| 378 | cds_list_for_each_entry_safe(ev, tmp, &loglevel->events, list) { |
| 379 | cds_list_del(&ev->list); |
| 380 | } |
| 381 | cds_list_del(&loglevel->session_list); |
| 382 | cds_list_del(&loglevel->list); |
| 383 | if (cds_list_empty(&loglevel->entry->session_list)) { |
| 384 | cds_hlist_del(&loglevel->entry->hlist); |
| 385 | free(loglevel->entry); |
| 386 | } |
| 387 | free(loglevel); |
| 388 | } |
| 389 | |
| 390 | int ltt_loglevel_enable(struct session_loglevel *loglevel) |
| 391 | { |
| 392 | struct ltt_event *ev; |
| 393 | int ret; |
| 394 | |
| 395 | if (loglevel->enabled) |
| 396 | return -EEXIST; |
| 397 | cds_list_for_each_entry(ev, &loglevel->events, list) { |
| 398 | ret = ltt_event_enable(ev); |
| 399 | if (ret) { |
| 400 | DBG("Error: enable error.\n"); |
| 401 | return ret; |
| 402 | } |
| 403 | } |
| 404 | loglevel->enabled = 1; |
| 405 | return 0; |
| 406 | } |
| 407 | |
| 408 | int ltt_loglevel_disable(struct session_loglevel *loglevel) |
| 409 | { |
| 410 | struct ltt_event *ev; |
| 411 | int ret; |
| 412 | |
| 413 | if (!loglevel->enabled) |
| 414 | return -EEXIST; |
| 415 | cds_list_for_each_entry(ev, &loglevel->events, list) { |
| 416 | ret = ltt_event_disable(ev); |
| 417 | if (ret) { |
| 418 | DBG("Error: disable error.\n"); |
| 419 | return ret; |
| 420 | } |
| 421 | } |
| 422 | loglevel->enabled = 0; |
| 423 | return 0; |
| 424 | } |
| 425 | |
| 426 | /* WILDCARDS */ |
| 427 | |
| 428 | /* |
| 429 | * Return wildcard for a given event name if the event name match the |
| 430 | * one of the wildcards. |
| 431 | * Must be called with ust lock held. |
| 432 | * Returns NULL if not present. |
| 433 | */ |
| 434 | struct wildcard_entry *match_wildcard(const char *name) |
| 435 | { |
| 436 | struct wildcard_entry *e; |
| 437 | |
| 438 | cds_list_for_each_entry(e, &wildcard_list, list) { |
| 439 | /* If only contain '*' */ |
| 440 | if (strlen(e->name) == 1) |
| 441 | return e; |
| 442 | /* Compare excluding final '*' */ |
| 443 | if (!strncmp(name, e->name, strlen(e->name) - 1)) |
| 444 | return e; |
| 445 | } |
| 446 | return NULL; |
| 447 | } |
| 448 | |
| 449 | /* |
| 450 | * marshall all probes/all events and create those that fit the |
| 451 | * wildcard. Add them to the events list as created. |
| 452 | */ |
| 453 | static |
| 454 | void _probes_create_wildcard_events(struct wildcard_entry *entry, |
| 455 | struct session_wildcard *wildcard) |
| 456 | { |
| 457 | struct lttng_probe_desc *probe_desc; |
| 458 | struct lttng_ust_event event_param; |
| 459 | int i; |
| 460 | |
| 461 | cds_list_for_each_entry(probe_desc, &probe_list, head) { |
| 462 | for (i = 0; i < probe_desc->nr_events; i++) { |
| 463 | const struct lttng_event_desc *event_desc; |
| 464 | int match = 0; |
| 465 | |
| 466 | event_desc = probe_desc->event_desc[i]; |
| 467 | /* compare excluding final '*' */ |
| 468 | assert(strlen(entry->name) > 0); |
| 469 | if (strcmp(event_desc->name, "lttng_ust:metadata") |
| 470 | && (strlen(entry->name) == 1 |
| 471 | || !strncmp(event_desc->name, entry->name, |
| 472 | strlen(entry->name) - 1))) { |
| 473 | match = 1; |
| 474 | } |
| 475 | if (match) { |
| 476 | struct ltt_event *ev; |
| 477 | int ret; |
| 478 | |
| 479 | memcpy(&event_param, &wildcard->event_param, |
| 480 | sizeof(event_param)); |
| 481 | memcpy(event_param.name, |
| 482 | event_desc->name, |
| 483 | sizeof(event_param.name)); |
| 484 | /* create event */ |
| 485 | ret = ltt_event_create(wildcard->chan, |
| 486 | &event_param, NULL, |
| 487 | &ev); |
| 488 | if (ret) { |
| 489 | DBG("Error creating event"); |
| 490 | continue; |
| 491 | } |
| 492 | cds_list_add(&ev->wildcard_list, |
| 493 | &wildcard->events); |
| 494 | } |
| 495 | } |
| 496 | } |
| 497 | } |
| 498 | |
| 499 | /* |
| 500 | * Add the wildcard to the wildcard hash table. Must be called with |
| 501 | * ust lock held. |
| 502 | */ |
| 503 | struct session_wildcard *add_wildcard(const char *name, |
| 504 | struct ltt_channel *chan, |
| 505 | struct lttng_ust_event *event_param) |
| 506 | { |
| 507 | struct wildcard_entry *e; |
| 508 | struct session_wildcard *sw; |
| 509 | size_t name_len = strlen(name) + 1; |
| 510 | int found = 0; |
| 511 | |
| 512 | /* wildcard entry */ |
| 513 | cds_list_for_each_entry(e, &wildcard_list, list) { |
| 514 | if (!strcmp(name, e->name)) { |
| 515 | found = 1; |
| 516 | break; |
| 517 | } |
| 518 | } |
| 519 | |
| 520 | if (!found) { |
| 521 | /* |
| 522 | * Using zmalloc here to allocate a variable length element. Could |
| 523 | * cause some memory fragmentation if overused. |
| 524 | */ |
| 525 | e = zmalloc(sizeof(struct wildcard_entry) + name_len); |
| 526 | if (!e) |
| 527 | return ERR_PTR(-ENOMEM); |
| 528 | memcpy(&e->name[0], name, name_len); |
| 529 | cds_list_add(&e->list, &wildcard_list); |
| 530 | CDS_INIT_LIST_HEAD(&e->session_list); |
| 531 | } |
| 532 | |
| 533 | /* session wildcard */ |
| 534 | cds_list_for_each_entry(sw, &e->session_list, session_list) { |
| 535 | if (chan == sw->chan) { |
| 536 | DBG("wildcard %s busy for this channel", name); |
| 537 | return ERR_PTR(-EEXIST); /* Already there */ |
| 538 | } |
| 539 | } |
| 540 | sw = zmalloc(sizeof(struct session_wildcard)); |
| 541 | if (!sw) |
| 542 | return ERR_PTR(-ENOMEM); |
| 543 | sw->chan = chan; |
| 544 | sw->enabled = 1; |
| 545 | memcpy(&sw->event_param, event_param, sizeof(sw->event_param)); |
| 546 | sw->event_param.instrumentation = LTTNG_UST_TRACEPOINT; |
| 547 | CDS_INIT_LIST_HEAD(&sw->events); |
| 548 | cds_list_add(&sw->list, &chan->session->wildcards); |
| 549 | cds_list_add(&sw->session_list, &e->session_list); |
| 550 | sw->entry = e; |
| 551 | _probes_create_wildcard_events(e, sw); |
| 552 | return sw; |
| 553 | } |
| 554 | |
| 555 | /* |
| 556 | * Remove the wildcard from the wildcard hash table. Must be called with |
| 557 | * ust_lock held. Only called at session teardown. |
| 558 | */ |
| 559 | void _remove_wildcard(struct session_wildcard *wildcard) |
| 560 | { |
| 561 | struct ltt_event *ev, *tmp; |
| 562 | |
| 563 | /* |
| 564 | * Just remove the events owned (for enable/disable) by this |
| 565 | * wildcard from the list. The session teardown will take care |
| 566 | * of freeing the event memory. |
| 567 | */ |
| 568 | cds_list_for_each_entry_safe(ev, tmp, &wildcard->events, list) { |
| 569 | cds_list_del(&ev->list); |
| 570 | } |
| 571 | cds_list_del(&wildcard->session_list); |
| 572 | cds_list_del(&wildcard->list); |
| 573 | if (cds_list_empty(&wildcard->entry->session_list)) { |
| 574 | cds_list_del(&wildcard->entry->list); |
| 575 | free(wildcard->entry); |
| 576 | } |
| 577 | free(wildcard); |
| 578 | } |
| 579 | |
| 580 | int ltt_wildcard_enable(struct session_wildcard *wildcard) |
| 581 | { |
| 582 | struct ltt_event *ev; |
| 583 | int ret; |
| 584 | |
| 585 | if (wildcard->enabled) |
| 586 | return -EEXIST; |
| 587 | cds_list_for_each_entry(ev, &wildcard->events, list) { |
| 588 | ret = ltt_event_enable(ev); |
| 589 | if (ret) { |
| 590 | DBG("Error: enable error.\n"); |
| 591 | return ret; |
| 592 | } |
| 593 | } |
| 594 | wildcard->enabled = 1; |
| 595 | return 0; |
| 596 | } |
| 597 | |
| 598 | int ltt_wildcard_disable(struct session_wildcard *wildcard) |
| 599 | { |
| 600 | struct ltt_event *ev; |
| 601 | int ret; |
| 602 | |
| 603 | if (!wildcard->enabled) |
| 604 | return -EEXIST; |
| 605 | cds_list_for_each_entry(ev, &wildcard->events, list) { |
| 606 | ret = ltt_event_disable(ev); |
| 607 | if (ret) { |
| 608 | DBG("Error: disable error.\n"); |
| 609 | return ret; |
| 610 | } |
| 611 | } |
| 612 | wildcard->enabled = 0; |
| 613 | return 0; |
| 614 | } |