| 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 "ust-consumer.h" |
| 35 | #include "ust-ctl.h" |
| 36 | |
| 37 | /* |
| 38 | * Delete ust app event safely. RCU read lock must be held before calling |
| 39 | * this function. |
| 40 | */ |
| 41 | static void delete_ust_app_event(int sock, struct ust_app_event *ua_event) |
| 42 | { |
| 43 | /* TODO : remove context */ |
| 44 | //struct ust_app_ctx *ltctx; |
| 45 | //cds_lfht_for_each_entry(lte->ctx, &iter, ltctx, node) { |
| 46 | // delete_ust_app_ctx(sock, ltctx); |
| 47 | //} |
| 48 | |
| 49 | ustctl_release_object(sock, ua_event->obj); |
| 50 | free(ua_event->obj); |
| 51 | free(ua_event); |
| 52 | } |
| 53 | |
| 54 | /* |
| 55 | * Delete ust app stream safely. RCU read lock must be held before calling |
| 56 | * this function. |
| 57 | */ |
| 58 | static void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream) |
| 59 | { |
| 60 | ustctl_release_object(sock, stream->obj); |
| 61 | free(stream->obj); |
| 62 | free(stream); |
| 63 | } |
| 64 | |
| 65 | /* |
| 66 | * Delete ust app channel safely. RCU read lock must be held before calling |
| 67 | * this function. |
| 68 | */ |
| 69 | static void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan) |
| 70 | { |
| 71 | int ret; |
| 72 | struct cds_lfht_iter iter; |
| 73 | struct ust_app_event *ua_event; |
| 74 | struct ltt_ust_stream *stream, *stmp; |
| 75 | |
| 76 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
| 77 | cds_list_del(&stream->list); |
| 78 | delete_ust_app_stream(sock, stream); |
| 79 | } |
| 80 | |
| 81 | /* TODO : remove channel context */ |
| 82 | //cds_lfht_for_each_entry(ltc->ctx, &iter, ltctx, node) { |
| 83 | // hashtable_del(ltc->ctx, &iter); |
| 84 | // delete_ust_app_ctx(sock, ltctx); |
| 85 | //} |
| 86 | //ret = hashtable_destroy(ltc->ctx); |
| 87 | |
| 88 | cds_lfht_for_each_entry(ua_chan->events, &iter, ua_event, node) { |
| 89 | hashtable_del(ua_chan->events, &iter); |
| 90 | delete_ust_app_event(sock, ua_event); |
| 91 | } |
| 92 | |
| 93 | ret = hashtable_destroy(ua_chan->events); |
| 94 | if (ret < 0) { |
| 95 | ERR("UST app destroy session hashtable failed"); |
| 96 | goto error; |
| 97 | } |
| 98 | ustctl_release_object(sock, ua_chan->obj); |
| 99 | free(ua_chan->obj); |
| 100 | free(ua_chan); |
| 101 | |
| 102 | error: |
| 103 | return; |
| 104 | } |
| 105 | |
| 106 | /* |
| 107 | * Delete ust app session safely. RCU read lock must be held before calling |
| 108 | * this function. |
| 109 | */ |
| 110 | static void delete_ust_app_session(int sock, |
| 111 | struct ust_app_session *ua_sess) |
| 112 | { |
| 113 | int ret; |
| 114 | struct cds_lfht_iter iter; |
| 115 | struct ust_app_channel *ua_chan; |
| 116 | |
| 117 | if (ua_sess->metadata) { |
| 118 | ustctl_release_object(sock, ua_sess->metadata->stream_obj); |
| 119 | free(ua_sess->metadata->stream_obj); |
| 120 | ustctl_release_object(sock, ua_sess->metadata->obj); |
| 121 | free(ua_sess->metadata->obj); |
| 122 | } |
| 123 | |
| 124 | cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) { |
| 125 | hashtable_del(ua_sess->channels, &iter); |
| 126 | delete_ust_app_channel(sock, ua_chan); |
| 127 | } |
| 128 | |
| 129 | ret = hashtable_destroy(ua_sess->channels); |
| 130 | if (ret < 0) { |
| 131 | ERR("UST app destroy session hashtable failed"); |
| 132 | goto error; |
| 133 | } |
| 134 | |
| 135 | error: |
| 136 | return; |
| 137 | } |
| 138 | |
| 139 | /* |
| 140 | * Delete a traceable application structure from the global list. Never call |
| 141 | * this function outside of a call_rcu call. |
| 142 | */ |
| 143 | static void delete_ust_app(struct ust_app *app) |
| 144 | { |
| 145 | int ret; |
| 146 | struct cds_lfht_node *node; |
| 147 | struct cds_lfht_iter iter; |
| 148 | struct ust_app_session *ua_sess; |
| 149 | int sock; |
| 150 | |
| 151 | rcu_read_lock(); |
| 152 | |
| 153 | /* Remove from key hash table */ |
| 154 | node = hashtable_lookup(ust_app_sock_key_map, |
| 155 | (void *) ((unsigned long) app->key.sock), sizeof(void *), &iter); |
| 156 | if (node == NULL) { |
| 157 | /* Not suppose to happen */ |
| 158 | ERR("UST app key %d not found in key hash table", app->key.sock); |
| 159 | goto end; |
| 160 | } |
| 161 | |
| 162 | ret = hashtable_del(ust_app_sock_key_map, &iter); |
| 163 | if (ret) { |
| 164 | ERR("UST app unable to delete app sock %d from key hash table", |
| 165 | app->key.sock); |
| 166 | } else { |
| 167 | DBG2("UST app pair sock %d key %d deleted", |
| 168 | app->key.sock, app->key.pid); |
| 169 | } |
| 170 | |
| 171 | /* Socket is already closed at this point */ |
| 172 | |
| 173 | /* Delete ust app sessions info */ |
| 174 | sock = app->key.sock; |
| 175 | app->key.sock = -1; |
| 176 | |
| 177 | cds_lfht_for_each_entry(app->sessions, &iter, ua_sess, node) { |
| 178 | hashtable_del(app->sessions, &iter); |
| 179 | delete_ust_app_session(app->key.sock, ua_sess); |
| 180 | } |
| 181 | |
| 182 | ret = hashtable_destroy(app->sessions); |
| 183 | if (ret < 0) { |
| 184 | ERR("UST app destroy session hashtable failed"); |
| 185 | goto end; |
| 186 | } |
| 187 | |
| 188 | /* |
| 189 | * Wait until we have removed the key from the sock hash table |
| 190 | * before closing this socket, otherwise an application could |
| 191 | * re-use the socket ID and race with the teardown, using the |
| 192 | * same hash table entry. |
| 193 | */ |
| 194 | close(sock); |
| 195 | |
| 196 | DBG2("UST app pid %d deleted", app->key.pid); |
| 197 | free(app); |
| 198 | end: |
| 199 | rcu_read_unlock(); |
| 200 | } |
| 201 | |
| 202 | /* |
| 203 | * URCU intermediate call to delete an UST app. |
| 204 | */ |
| 205 | static void delete_ust_app_rcu(struct rcu_head *head) |
| 206 | { |
| 207 | struct cds_lfht_node *node = |
| 208 | caa_container_of(head, struct cds_lfht_node, head); |
| 209 | struct ust_app *app = |
| 210 | caa_container_of(node, struct ust_app, node); |
| 211 | |
| 212 | delete_ust_app(app); |
| 213 | } |
| 214 | |
| 215 | /* |
| 216 | * Find an ust_app using the sock and return it. RCU read side lock must be |
| 217 | * held before calling this helper function. |
| 218 | */ |
| 219 | static struct ust_app *find_app_by_sock(int sock) |
| 220 | { |
| 221 | struct cds_lfht_node *node; |
| 222 | struct ust_app_key *key; |
| 223 | struct cds_lfht_iter iter; |
| 224 | |
| 225 | node = hashtable_lookup(ust_app_sock_key_map, |
| 226 | (void *)((unsigned long) sock), sizeof(void *), &iter); |
| 227 | if (node == NULL) { |
| 228 | DBG2("UST app find by sock %d key not found", sock); |
| 229 | goto error; |
| 230 | } |
| 231 | |
| 232 | key = caa_container_of(node, struct ust_app_key, node); |
| 233 | |
| 234 | node = hashtable_lookup(ust_app_ht, |
| 235 | (void *)((unsigned long) key->pid), sizeof(void *), &iter); |
| 236 | if (node == NULL) { |
| 237 | DBG2("UST app find by sock %d not found", sock); |
| 238 | goto error; |
| 239 | } |
| 240 | return caa_container_of(node, struct ust_app, node); |
| 241 | |
| 242 | error: |
| 243 | return NULL; |
| 244 | } |
| 245 | |
| 246 | /* |
| 247 | * Open metadata onto the UST tracer for a UST session. |
| 248 | */ |
| 249 | static int open_ust_metadata(struct ust_app *app, |
| 250 | struct ust_app_session *ua_sess) |
| 251 | { |
| 252 | int ret; |
| 253 | struct lttng_ust_channel_attr uattr; |
| 254 | |
| 255 | uattr.overwrite = ua_sess->metadata->attr.overwrite; |
| 256 | uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size; |
| 257 | uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf; |
| 258 | uattr.switch_timer_interval = |
| 259 | ua_sess->metadata->attr.switch_timer_interval; |
| 260 | uattr.read_timer_interval = |
| 261 | ua_sess->metadata->attr.read_timer_interval; |
| 262 | uattr.output = ua_sess->metadata->attr.output; |
| 263 | |
| 264 | /* UST tracer metadata creation */ |
| 265 | ret = ustctl_open_metadata(app->key.sock, ua_sess->handle, &uattr, |
| 266 | &ua_sess->metadata->obj); |
| 267 | if (ret < 0) { |
| 268 | ERR("UST app open metadata failed for app pid:%d", |
| 269 | app->key.pid); |
| 270 | goto error; |
| 271 | } |
| 272 | |
| 273 | error: |
| 274 | return ret; |
| 275 | } |
| 276 | |
| 277 | /* |
| 278 | * Create stream onto the UST tracer for a UST session. |
| 279 | */ |
| 280 | static int create_ust_stream(struct ust_app *app, |
| 281 | struct ust_app_session *ua_sess) |
| 282 | { |
| 283 | int ret; |
| 284 | |
| 285 | ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj, |
| 286 | &ua_sess->metadata->stream_obj); |
| 287 | if (ret < 0) { |
| 288 | ERR("UST create metadata stream failed"); |
| 289 | goto error; |
| 290 | } |
| 291 | |
| 292 | error: |
| 293 | return ret; |
| 294 | } |
| 295 | |
| 296 | /* |
| 297 | * Create the specified channel onto the UST tracer for a UST session. |
| 298 | */ |
| 299 | static int create_ust_channel(struct ust_app *app, |
| 300 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) |
| 301 | { |
| 302 | int ret; |
| 303 | |
| 304 | /* TODO: remove cast and use lttng-ust-abi.h */ |
| 305 | ret = ustctl_create_channel(app->key.sock, ua_sess->handle, |
| 306 | (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj); |
| 307 | if (ret < 0) { |
| 308 | DBG("Error creating channel %s for app (pid: %d, sock: %d) " |
| 309 | "and session handle %d with ret %d", |
| 310 | ua_chan->name, app->key.pid, app->key.sock, |
| 311 | ua_sess->handle, ret); |
| 312 | goto error; |
| 313 | } |
| 314 | |
| 315 | ua_chan->handle = ua_chan->obj->handle; |
| 316 | ua_chan->attr.shm_fd = ua_chan->obj->shm_fd; |
| 317 | ua_chan->attr.wait_fd = ua_chan->obj->wait_fd; |
| 318 | ua_chan->attr.memory_map_size = ua_chan->obj->memory_map_size; |
| 319 | |
| 320 | DBG2("UST app channel %s created successfully for pid:%d and sock:%d", |
| 321 | ua_chan->name, app->key.pid, app->key.sock); |
| 322 | |
| 323 | error: |
| 324 | return ret; |
| 325 | } |
| 326 | |
| 327 | /* |
| 328 | * Create the specified event onto the UST tracer for a UST session. |
| 329 | */ |
| 330 | static int create_ust_event(struct ust_app *app, |
| 331 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, |
| 332 | struct ust_app_event *ua_event) |
| 333 | { |
| 334 | int ret = 0; |
| 335 | |
| 336 | /* Create UST event on tracer */ |
| 337 | ret = ustctl_create_event(app->key.sock, &ua_event->attr, ua_chan->obj, |
| 338 | &ua_event->obj); |
| 339 | if (ret < 0) { |
| 340 | ERR("Error ustctl create event %s for app pid: %d with ret %d", |
| 341 | ua_event->attr.name, app->key.pid, ret); |
| 342 | goto error; |
| 343 | } |
| 344 | |
| 345 | ua_event->handle = ua_event->obj->handle; |
| 346 | ua_event->enabled = 1; |
| 347 | |
| 348 | DBG2("UST app event %s created successfully for pid:%d", |
| 349 | ua_event->attr.name, app->key.pid); |
| 350 | |
| 351 | error: |
| 352 | return ret; |
| 353 | } |
| 354 | |
| 355 | /* |
| 356 | * Alloc new UST app session. |
| 357 | */ |
| 358 | static struct ust_app_session *alloc_ust_app_session(void) |
| 359 | { |
| 360 | struct ust_app_session *ua_sess; |
| 361 | |
| 362 | /* Init most of the default value by allocating and zeroing */ |
| 363 | ua_sess = zmalloc(sizeof(struct ust_app_session)); |
| 364 | if (ua_sess == NULL) { |
| 365 | PERROR("malloc"); |
| 366 | goto error; |
| 367 | } |
| 368 | |
| 369 | ua_sess->handle = -1; |
| 370 | ua_sess->channels = hashtable_new_str(0); |
| 371 | |
| 372 | return ua_sess; |
| 373 | |
| 374 | error: |
| 375 | return NULL; |
| 376 | } |
| 377 | |
| 378 | /* |
| 379 | * Alloc new UST app channel. |
| 380 | */ |
| 381 | static struct ust_app_channel *alloc_ust_app_channel(char *name, |
| 382 | struct lttng_ust_channel *attr) |
| 383 | { |
| 384 | struct ust_app_channel *ua_chan; |
| 385 | |
| 386 | /* Init most of the default value by allocating and zeroing */ |
| 387 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); |
| 388 | if (ua_chan == NULL) { |
| 389 | PERROR("malloc"); |
| 390 | goto error; |
| 391 | } |
| 392 | |
| 393 | /* Setup channel name */ |
| 394 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); |
| 395 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; |
| 396 | |
| 397 | ua_chan->handle = -1; |
| 398 | ua_chan->ctx = hashtable_new(0); |
| 399 | ua_chan->events = hashtable_new_str(0); |
| 400 | hashtable_node_init(&ua_chan->node, (void *) ua_chan->name, |
| 401 | strlen(ua_chan->name)); |
| 402 | |
| 403 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); |
| 404 | |
| 405 | /* Copy attributes */ |
| 406 | if (attr) { |
| 407 | memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr)); |
| 408 | } |
| 409 | |
| 410 | DBG3("UST app channel %s allocated", ua_chan->name); |
| 411 | |
| 412 | return ua_chan; |
| 413 | |
| 414 | error: |
| 415 | return NULL; |
| 416 | } |
| 417 | |
| 418 | /* |
| 419 | * Alloc new UST app event. |
| 420 | */ |
| 421 | static struct ust_app_event *alloc_ust_app_event(char *name, |
| 422 | struct lttng_ust_event *attr) |
| 423 | { |
| 424 | struct ust_app_event *ua_event; |
| 425 | |
| 426 | /* Init most of the default value by allocating and zeroing */ |
| 427 | ua_event = zmalloc(sizeof(struct ust_app_event)); |
| 428 | if (ua_event == NULL) { |
| 429 | PERROR("malloc"); |
| 430 | goto error; |
| 431 | } |
| 432 | |
| 433 | strncpy(ua_event->name, name, sizeof(ua_event->name)); |
| 434 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; |
| 435 | ua_event->ctx = hashtable_new(0); |
| 436 | hashtable_node_init(&ua_event->node, (void *) ua_event->name, |
| 437 | strlen(ua_event->name)); |
| 438 | |
| 439 | /* Copy attributes */ |
| 440 | if (attr) { |
| 441 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); |
| 442 | } |
| 443 | |
| 444 | DBG3("UST app event %s allocated", ua_event->name); |
| 445 | |
| 446 | return ua_event; |
| 447 | |
| 448 | error: |
| 449 | return NULL; |
| 450 | } |
| 451 | |
| 452 | /* |
| 453 | * Copy data between an UST app event and a LTT event. |
| 454 | */ |
| 455 | static void shadow_copy_event(struct ust_app_event *ua_event, |
| 456 | struct ltt_ust_event *uevent) |
| 457 | { |
| 458 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
| 459 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; |
| 460 | |
| 461 | /* Copy event attributes */ |
| 462 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); |
| 463 | |
| 464 | /* TODO: support copy context */ |
| 465 | } |
| 466 | |
| 467 | /* |
| 468 | * Copy data between an UST app channel and a LTT channel. |
| 469 | */ |
| 470 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
| 471 | struct ltt_ust_channel *uchan) |
| 472 | { |
| 473 | struct cds_lfht_iter iter; |
| 474 | struct cds_lfht_node *ua_event_node; |
| 475 | struct ltt_ust_event *uevent; |
| 476 | struct ust_app_event *ua_event; |
| 477 | |
| 478 | DBG2("Shadow copy of UST app channel %s", ua_chan->name); |
| 479 | |
| 480 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); |
| 481 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; |
| 482 | /* Copy event attributes */ |
| 483 | memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr)); |
| 484 | |
| 485 | /* TODO: support copy context */ |
| 486 | |
| 487 | /* Copy all events from ltt ust channel to ust app channel */ |
| 488 | cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) { |
| 489 | struct cds_lfht_iter uiter; |
| 490 | |
| 491 | ua_event_node = hashtable_lookup(ua_chan->events, |
| 492 | (void *) uevent->attr.name, strlen(uevent->attr.name), |
| 493 | &uiter); |
| 494 | if (ua_event_node == NULL) { |
| 495 | DBG2("UST event %s not found on shadow copy channel", |
| 496 | uevent->attr.name); |
| 497 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
| 498 | if (ua_event == NULL) { |
| 499 | continue; |
| 500 | } |
| 501 | shadow_copy_event(ua_event, uevent); |
| 502 | hashtable_add_unique(ua_chan->events, &ua_event->node); |
| 503 | } |
| 504 | } |
| 505 | |
| 506 | DBG3("Shadow copy channel done"); |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * Copy data between a UST app session and a regular LTT session. |
| 511 | */ |
| 512 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
| 513 | struct ltt_ust_session *usess, |
| 514 | struct ust_app *app) |
| 515 | { |
| 516 | struct cds_lfht_node *ua_chan_node; |
| 517 | struct cds_lfht_iter iter; |
| 518 | struct ltt_ust_channel *uchan; |
| 519 | struct ust_app_channel *ua_chan; |
| 520 | time_t rawtime; |
| 521 | struct tm *timeinfo; |
| 522 | char datetime[16]; |
| 523 | int ret; |
| 524 | |
| 525 | /* Get date and time for unique app path */ |
| 526 | time(&rawtime); |
| 527 | timeinfo = localtime(&rawtime); |
| 528 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); |
| 529 | |
| 530 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
| 531 | |
| 532 | ua_sess->uid = usess->uid; |
| 533 | |
| 534 | ret = snprintf(ua_sess->path, PATH_MAX, |
| 535 | "%s/%s-%d-%s", |
| 536 | usess->pathname, app->name, app->key.pid, |
| 537 | datetime); |
| 538 | if (ret < 0) { |
| 539 | PERROR("asprintf UST shadow copy session"); |
| 540 | /* TODO: We cannot return an error from here.. */ |
| 541 | assert(0); |
| 542 | } |
| 543 | |
| 544 | /* TODO: support all UST domain */ |
| 545 | |
| 546 | /* Iterate over all channels in global domain. */ |
| 547 | cds_lfht_for_each_entry(usess->domain_global.channels, &iter, |
| 548 | uchan, node) { |
| 549 | struct cds_lfht_iter uiter; |
| 550 | |
| 551 | ua_chan_node = hashtable_lookup(ua_sess->channels, |
| 552 | (void *)uchan->name, strlen(uchan->name), |
| 553 | &uiter); |
| 554 | if (ua_chan_node != NULL) { |
| 555 | continue; |
| 556 | } |
| 557 | |
| 558 | DBG2("Channel %s not found on shadow session copy, creating it", |
| 559 | uchan->name); |
| 560 | ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr); |
| 561 | if (ua_chan == NULL) { |
| 562 | /* malloc failed... continuing */ |
| 563 | continue; |
| 564 | } |
| 565 | |
| 566 | shadow_copy_channel(ua_chan, uchan); |
| 567 | hashtable_add_unique(ua_sess->channels, &ua_chan->node); |
| 568 | } |
| 569 | } |
| 570 | |
| 571 | static |
| 572 | void __lookup_session_by_app(struct ltt_ust_session *usess, |
| 573 | struct ust_app *app, struct cds_lfht_iter *iter) |
| 574 | { |
| 575 | /* Get right UST app session from app */ |
| 576 | (void) hashtable_lookup(app->sessions, |
| 577 | (void *) ((unsigned long) usess->uid), sizeof(void *), |
| 578 | iter); |
| 579 | } |
| 580 | |
| 581 | /* |
| 582 | * Return ust app session from the app session hashtable using the UST session |
| 583 | * uid. |
| 584 | */ |
| 585 | static struct ust_app_session *lookup_session_by_app( |
| 586 | struct ltt_ust_session *usess, struct ust_app *app) |
| 587 | { |
| 588 | struct cds_lfht_iter iter; |
| 589 | struct cds_lfht_node *node; |
| 590 | |
| 591 | __lookup_session_by_app(usess, app, &iter); |
| 592 | node = hashtable_iter_get_node(&iter); |
| 593 | if (node == NULL) { |
| 594 | goto error; |
| 595 | } |
| 596 | |
| 597 | return caa_container_of(node, struct ust_app_session, node); |
| 598 | |
| 599 | error: |
| 600 | return NULL; |
| 601 | } |
| 602 | |
| 603 | /* |
| 604 | * Create a UST session onto the tracer of app and add it the session |
| 605 | * hashtable. |
| 606 | * |
| 607 | * Return ust app session or NULL on error. |
| 608 | */ |
| 609 | static struct ust_app_session *create_ust_app_session( |
| 610 | struct ltt_ust_session *usess, struct ust_app *app) |
| 611 | { |
| 612 | int ret; |
| 613 | struct ust_app_session *ua_sess; |
| 614 | |
| 615 | ua_sess = lookup_session_by_app(usess, app); |
| 616 | if (ua_sess == NULL) { |
| 617 | DBG2("UST app pid: %d session uid %d not found, creating it", |
| 618 | app->key.pid, usess->uid); |
| 619 | ua_sess = alloc_ust_app_session(); |
| 620 | if (ua_sess == NULL) { |
| 621 | /* Only malloc can failed so something is really wrong */ |
| 622 | goto error; |
| 623 | } |
| 624 | shadow_copy_session(ua_sess, usess, app); |
| 625 | } |
| 626 | |
| 627 | if (ua_sess->handle == -1) { |
| 628 | ret = ustctl_create_session(app->key.sock); |
| 629 | if (ret < 0) { |
| 630 | ERR("Error creating session for app pid %d, sock %d", |
| 631 | app->key.pid, app->key.sock); |
| 632 | /* TODO: free() ua_sess */ |
| 633 | goto error; |
| 634 | } |
| 635 | |
| 636 | DBG2("UST app ustctl create session handle %d", ret); |
| 637 | ua_sess->handle = ret; |
| 638 | |
| 639 | /* Add ust app session to app's HT */ |
| 640 | hashtable_node_init(&ua_sess->node, |
| 641 | (void *)((unsigned long) ua_sess->uid), sizeof(void *)); |
| 642 | hashtable_add_unique(app->sessions, &ua_sess->node); |
| 643 | |
| 644 | DBG2("UST app session created successfully with handle %d", ret); |
| 645 | } |
| 646 | |
| 647 | return ua_sess; |
| 648 | |
| 649 | error: |
| 650 | return NULL; |
| 651 | } |
| 652 | |
| 653 | /* |
| 654 | * Create UST app channel and create it on the tracer. |
| 655 | */ |
| 656 | static struct ust_app_channel *create_ust_app_channel( |
| 657 | struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan, |
| 658 | struct ust_app *app) |
| 659 | { |
| 660 | int ret = 0; |
| 661 | struct cds_lfht_iter iter; |
| 662 | struct cds_lfht_node *ua_chan_node; |
| 663 | struct ust_app_channel *ua_chan; |
| 664 | |
| 665 | /* Lookup channel in the ust app session */ |
| 666 | ua_chan_node = hashtable_lookup(ua_sess->channels, |
| 667 | (void *)uchan->name, strlen(uchan->name), &iter); |
| 668 | if (ua_chan_node == NULL) { |
| 669 | DBG2("Unable to find channel %s in ust session uid %u", |
| 670 | uchan->name, ua_sess->uid); |
| 671 | ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr); |
| 672 | if (ua_chan == NULL) { |
| 673 | goto error; |
| 674 | } |
| 675 | shadow_copy_channel(ua_chan, uchan); |
| 676 | |
| 677 | hashtable_add_unique(ua_sess->channels, &ua_chan->node); |
| 678 | } else { |
| 679 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
| 680 | } |
| 681 | |
| 682 | ret = create_ust_channel(app, ua_sess, ua_chan); |
| 683 | if (ret < 0) { |
| 684 | goto error; |
| 685 | } |
| 686 | |
| 687 | return ua_chan; |
| 688 | |
| 689 | error: |
| 690 | return NULL; |
| 691 | } |
| 692 | |
| 693 | /* |
| 694 | * Create UST app event and create it on the tracer side. |
| 695 | */ |
| 696 | static struct ust_app_event *create_ust_app_event( |
| 697 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan, |
| 698 | struct ltt_ust_event *uevent, struct ust_app *app) |
| 699 | { |
| 700 | int ret; |
| 701 | struct cds_lfht_iter iter; |
| 702 | struct cds_lfht_node *ua_event_node; |
| 703 | struct ust_app_event *ua_event; |
| 704 | |
| 705 | /* Get event node */ |
| 706 | ua_event_node = hashtable_lookup(ua_chan->events, |
| 707 | (void *)uevent->attr.name, strlen(uevent->attr.name), &iter); |
| 708 | if (ua_event_node == NULL) { |
| 709 | DBG2("UST app event %s not found, creating it", uevent->attr.name); |
| 710 | /* Does not exist so create one */ |
| 711 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
| 712 | if (ua_event == NULL) { |
| 713 | /* Only malloc can failed so something is really wrong */ |
| 714 | goto error; |
| 715 | } |
| 716 | shadow_copy_event(ua_event, uevent); |
| 717 | |
| 718 | hashtable_add_unique(ua_chan->events, &ua_event->node); |
| 719 | } else { |
| 720 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); |
| 721 | } |
| 722 | |
| 723 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
| 724 | if (ret < 0) { |
| 725 | goto error; |
| 726 | } |
| 727 | |
| 728 | return ua_event; |
| 729 | |
| 730 | error: |
| 731 | return NULL; |
| 732 | } |
| 733 | |
| 734 | /* |
| 735 | * Create UST metadata and open it on the tracer side. |
| 736 | */ |
| 737 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, |
| 738 | char *pathname, struct ust_app *app) |
| 739 | { |
| 740 | int ret = 0; |
| 741 | |
| 742 | if (ua_sess->metadata == NULL) { |
| 743 | /* Allocate UST metadata */ |
| 744 | ua_sess->metadata = trace_ust_create_metadata(pathname); |
| 745 | if (ua_sess->metadata == NULL) { |
| 746 | ERR("UST app session %d creating metadata failed", |
| 747 | ua_sess->handle); |
| 748 | goto error; |
| 749 | } |
| 750 | |
| 751 | ret = open_ust_metadata(app, ua_sess); |
| 752 | if (ret < 0) { |
| 753 | goto error; |
| 754 | } |
| 755 | |
| 756 | DBG2("UST metadata opened for app pid %d", app->key.pid); |
| 757 | } |
| 758 | |
| 759 | /* Open UST metadata stream */ |
| 760 | if (ua_sess->metadata->stream_obj == NULL) { |
| 761 | ret = create_ust_stream(app, ua_sess); |
| 762 | if (ret < 0) { |
| 763 | goto error; |
| 764 | } |
| 765 | |
| 766 | ret = mkdir(ua_sess->path, S_IRWXU | S_IRWXG); |
| 767 | if (ret < 0) { |
| 768 | PERROR("mkdir UST metadata"); |
| 769 | goto error; |
| 770 | } |
| 771 | |
| 772 | ret = snprintf(ua_sess->metadata->pathname, PATH_MAX, |
| 773 | "%s/metadata", ua_sess->path); |
| 774 | if (ret < 0) { |
| 775 | PERROR("asprintf UST create stream"); |
| 776 | goto error; |
| 777 | } |
| 778 | |
| 779 | DBG2("UST metadata stream object created for app pid %d", |
| 780 | app->key.pid); |
| 781 | } else { |
| 782 | ERR("Attempting to create stream without metadata opened"); |
| 783 | goto error; |
| 784 | } |
| 785 | |
| 786 | return 0; |
| 787 | |
| 788 | error: |
| 789 | return -1; |
| 790 | } |
| 791 | |
| 792 | /* |
| 793 | * Return pointer to traceable apps list. |
| 794 | */ |
| 795 | struct cds_lfht *ust_app_get_ht(void) |
| 796 | { |
| 797 | return ust_app_ht; |
| 798 | } |
| 799 | |
| 800 | /* |
| 801 | * Return ust app pointer or NULL if not found. |
| 802 | */ |
| 803 | struct ust_app *ust_app_find_by_pid(pid_t pid) |
| 804 | { |
| 805 | struct cds_lfht_node *node; |
| 806 | struct cds_lfht_iter iter; |
| 807 | |
| 808 | rcu_read_lock(); |
| 809 | node = hashtable_lookup(ust_app_ht, |
| 810 | (void *)((unsigned long) pid), sizeof(void *), &iter); |
| 811 | if (node == NULL) { |
| 812 | DBG2("UST app no found with pid %d", pid); |
| 813 | goto error; |
| 814 | } |
| 815 | rcu_read_unlock(); |
| 816 | |
| 817 | DBG2("Found UST app by pid %d", pid); |
| 818 | |
| 819 | return caa_container_of(node, struct ust_app, node); |
| 820 | |
| 821 | error: |
| 822 | rcu_read_unlock(); |
| 823 | return NULL; |
| 824 | } |
| 825 | |
| 826 | /* |
| 827 | * Using pid and uid (of the app), allocate a new ust_app struct and |
| 828 | * add it to the global traceable app list. |
| 829 | * |
| 830 | * On success, return 0, else return malloc ENOMEM. |
| 831 | */ |
| 832 | int ust_app_register(struct ust_register_msg *msg, int sock) |
| 833 | { |
| 834 | struct ust_app *lta; |
| 835 | |
| 836 | lta = zmalloc(sizeof(struct ust_app)); |
| 837 | if (lta == NULL) { |
| 838 | PERROR("malloc"); |
| 839 | return -ENOMEM; |
| 840 | } |
| 841 | |
| 842 | lta->ppid = msg->ppid; |
| 843 | lta->uid = msg->uid; |
| 844 | lta->gid = msg->gid; |
| 845 | lta->v_major = msg->major; |
| 846 | lta->v_minor = msg->minor; |
| 847 | strncpy(lta->name, msg->name, sizeof(lta->name)); |
| 848 | lta->name[16] = '\0'; |
| 849 | lta->sessions = hashtable_new(0); |
| 850 | |
| 851 | /* Set key map */ |
| 852 | lta->key.pid = msg->pid; |
| 853 | hashtable_node_init(<a->node, (void *)((unsigned long)lta->key.pid), |
| 854 | sizeof(void *)); |
| 855 | lta->key.sock = sock; |
| 856 | hashtable_node_init(<a->key.node, (void *)((unsigned long)lta->key.sock), |
| 857 | sizeof(void *)); |
| 858 | |
| 859 | rcu_read_lock(); |
| 860 | hashtable_add_unique(ust_app_sock_key_map, <a->key.node); |
| 861 | hashtable_add_unique(ust_app_ht, <a->node); |
| 862 | rcu_read_unlock(); |
| 863 | |
| 864 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s" |
| 865 | " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid, |
| 866 | lta->key.sock, lta->name, lta->v_major, lta->v_minor); |
| 867 | |
| 868 | return 0; |
| 869 | } |
| 870 | |
| 871 | /* |
| 872 | * Unregister app by removing it from the global traceable app list and freeing |
| 873 | * the data struct. |
| 874 | * |
| 875 | * The socket is already closed at this point so no close to sock. |
| 876 | */ |
| 877 | void ust_app_unregister(int sock) |
| 878 | { |
| 879 | struct ust_app *lta; |
| 880 | struct cds_lfht_node *node; |
| 881 | struct cds_lfht_iter iter; |
| 882 | |
| 883 | rcu_read_lock(); |
| 884 | lta = find_app_by_sock(sock); |
| 885 | if (lta == NULL) { |
| 886 | ERR("Unregister app sock %d not found!", sock); |
| 887 | goto error; |
| 888 | } |
| 889 | |
| 890 | DBG("PID %d unregistering with sock %d", lta->key.pid, sock); |
| 891 | |
| 892 | /* Get the node reference for a call_rcu */ |
| 893 | node = hashtable_lookup(ust_app_ht, |
| 894 | (void *)((unsigned long) lta->key.pid), sizeof(void *), &iter); |
| 895 | if (node == NULL) { |
| 896 | ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid); |
| 897 | goto error; |
| 898 | } |
| 899 | |
| 900 | hashtable_del(ust_app_ht, &iter); |
| 901 | call_rcu(&node->head, delete_ust_app_rcu); |
| 902 | error: |
| 903 | rcu_read_unlock(); |
| 904 | return; |
| 905 | } |
| 906 | |
| 907 | /* |
| 908 | * Return traceable_app_count |
| 909 | */ |
| 910 | unsigned long ust_app_list_count(void) |
| 911 | { |
| 912 | unsigned long count; |
| 913 | |
| 914 | rcu_read_lock(); |
| 915 | count = hashtable_get_count(ust_app_ht); |
| 916 | rcu_read_unlock(); |
| 917 | |
| 918 | return count; |
| 919 | } |
| 920 | |
| 921 | /* |
| 922 | * Fill events array with all events name of all registered apps. |
| 923 | */ |
| 924 | int ust_app_list_events(struct lttng_event **events) |
| 925 | { |
| 926 | int ret, handle; |
| 927 | size_t nbmem, count = 0; |
| 928 | struct cds_lfht_iter iter; |
| 929 | struct ust_app *app; |
| 930 | struct lttng_event *tmp; |
| 931 | |
| 932 | nbmem = UST_APP_EVENT_LIST_SIZE; |
| 933 | tmp = zmalloc(nbmem * sizeof(struct lttng_event)); |
| 934 | if (tmp == NULL) { |
| 935 | PERROR("zmalloc ust app events"); |
| 936 | ret = -ENOMEM; |
| 937 | goto error; |
| 938 | } |
| 939 | |
| 940 | rcu_read_lock(); |
| 941 | |
| 942 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 943 | handle = ustctl_tracepoint_list(app->key.sock); |
| 944 | if (handle < 0) { |
| 945 | ERR("UST app list events getting handle failed for app pid %d", |
| 946 | app->key.pid); |
| 947 | continue; |
| 948 | } |
| 949 | |
| 950 | while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle, |
| 951 | tmp[count].name)) != -ENOENT) { |
| 952 | if (count > nbmem) { |
| 953 | DBG2("Reallocating event list from %zu to %zu bytes", nbmem, |
| 954 | nbmem + UST_APP_EVENT_LIST_SIZE); |
| 955 | nbmem += UST_APP_EVENT_LIST_SIZE; |
| 956 | tmp = realloc(tmp, nbmem); |
| 957 | if (tmp == NULL) { |
| 958 | PERROR("realloc ust app events"); |
| 959 | ret = -ENOMEM; |
| 960 | goto rcu_error; |
| 961 | } |
| 962 | } |
| 963 | |
| 964 | tmp[count].type = LTTNG_UST_TRACEPOINT; |
| 965 | tmp[count].pid = app->key.pid; |
| 966 | tmp[count].enabled = -1; |
| 967 | count++; |
| 968 | } |
| 969 | } |
| 970 | |
| 971 | ret = count; |
| 972 | *events = tmp; |
| 973 | |
| 974 | DBG2("UST app list events done (%zu events)", count); |
| 975 | |
| 976 | rcu_error: |
| 977 | rcu_read_unlock(); |
| 978 | error: |
| 979 | return ret; |
| 980 | } |
| 981 | |
| 982 | /* |
| 983 | * Free and clean all traceable apps of the global list. |
| 984 | */ |
| 985 | void ust_app_clean_list(void) |
| 986 | { |
| 987 | int ret; |
| 988 | struct cds_lfht_node *node; |
| 989 | struct cds_lfht_iter iter; |
| 990 | struct ust_app *app; |
| 991 | |
| 992 | DBG2("UST app cleaning registered apps hash table"); |
| 993 | |
| 994 | rcu_read_lock(); |
| 995 | |
| 996 | cds_lfht_for_each(ust_app_ht, &iter, node) { |
| 997 | app = caa_container_of(node, struct ust_app, node); |
| 998 | |
| 999 | ret = hashtable_del(ust_app_ht, &iter); |
| 1000 | if (!ret) { |
| 1001 | call_rcu(&node->head, delete_ust_app_rcu); |
| 1002 | } |
| 1003 | } |
| 1004 | |
| 1005 | hashtable_destroy(ust_app_ht); |
| 1006 | hashtable_destroy(ust_app_sock_key_map); |
| 1007 | |
| 1008 | rcu_read_unlock(); |
| 1009 | } |
| 1010 | |
| 1011 | /* |
| 1012 | * Init UST app hash table. |
| 1013 | */ |
| 1014 | void ust_app_ht_alloc(void) |
| 1015 | { |
| 1016 | ust_app_ht = hashtable_new(0); |
| 1017 | ust_app_sock_key_map = hashtable_new(0); |
| 1018 | } |
| 1019 | |
| 1020 | /* |
| 1021 | * For a specific UST session, create the channel for all registered apps. |
| 1022 | */ |
| 1023 | int ust_app_create_channel_all(struct ltt_ust_session *usess, |
| 1024 | struct ltt_ust_channel *uchan) |
| 1025 | { |
| 1026 | int ret = 0; |
| 1027 | struct cds_lfht_iter iter; |
| 1028 | struct ust_app *app; |
| 1029 | struct ust_app_session *ua_sess; |
| 1030 | struct ust_app_channel *ua_chan; |
| 1031 | |
| 1032 | if (usess == NULL || uchan == NULL) { |
| 1033 | ERR("Adding UST global channel to NULL values"); |
| 1034 | ret = -1; |
| 1035 | goto error; |
| 1036 | } |
| 1037 | |
| 1038 | DBG2("UST app adding channel %s to global domain for session uid %d", |
| 1039 | uchan->name, usess->uid); |
| 1040 | |
| 1041 | rcu_read_lock(); |
| 1042 | |
| 1043 | /* For every registered applications */ |
| 1044 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1045 | /* Create session on the tracer side and add it to app session HT */ |
| 1046 | ua_sess = create_ust_app_session(usess, app); |
| 1047 | if (ua_sess == NULL) { |
| 1048 | continue; |
| 1049 | } |
| 1050 | |
| 1051 | /* Create channel onto application */ |
| 1052 | ua_chan = create_ust_app_channel(ua_sess, uchan, app); |
| 1053 | if (ua_chan == NULL) { |
| 1054 | continue; |
| 1055 | } |
| 1056 | } |
| 1057 | |
| 1058 | rcu_read_unlock(); |
| 1059 | |
| 1060 | error: |
| 1061 | return ret; |
| 1062 | } |
| 1063 | |
| 1064 | /* |
| 1065 | * For a specific UST session and UST channel, create the event for all |
| 1066 | * registered apps. |
| 1067 | */ |
| 1068 | int ust_app_create_event_all(struct ltt_ust_session *usess, |
| 1069 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
| 1070 | { |
| 1071 | int ret = 0; |
| 1072 | struct cds_lfht_iter iter; |
| 1073 | struct cds_lfht_node *ua_chan_node; |
| 1074 | struct ust_app *app; |
| 1075 | struct ust_app_session *ua_sess; |
| 1076 | struct ust_app_channel *ua_chan; |
| 1077 | struct ust_app_event *ua_event; |
| 1078 | |
| 1079 | DBG("UST app creating event %s for all apps for session uid %d", |
| 1080 | uevent->attr.name, usess->uid); |
| 1081 | |
| 1082 | rcu_read_lock(); |
| 1083 | |
| 1084 | /* For all registered applications */ |
| 1085 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1086 | struct cds_lfht_iter uiter; |
| 1087 | |
| 1088 | /* Create session on the tracer side and add it to app session HT */ |
| 1089 | ua_sess = create_ust_app_session(usess, app); |
| 1090 | if (ua_sess == NULL) { |
| 1091 | continue; |
| 1092 | } |
| 1093 | |
| 1094 | /* Lookup channel in the ust app session */ |
| 1095 | ua_chan_node = hashtable_lookup(ua_sess->channels, |
| 1096 | (void *)uchan->name, strlen(uchan->name), |
| 1097 | &uiter); |
| 1098 | if (ua_chan_node == NULL) { |
| 1099 | ERR("Channel %s not found in session uid %d. Skipping", |
| 1100 | uchan->name, usess->uid); |
| 1101 | continue; |
| 1102 | } |
| 1103 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
| 1104 | |
| 1105 | ua_event = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
| 1106 | if (ua_event == NULL) { |
| 1107 | continue; |
| 1108 | } |
| 1109 | } |
| 1110 | |
| 1111 | rcu_read_unlock(); |
| 1112 | |
| 1113 | return ret; |
| 1114 | } |
| 1115 | |
| 1116 | /* |
| 1117 | * Start tracing for a specific UST session and app. |
| 1118 | */ |
| 1119 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
| 1120 | { |
| 1121 | int ret = 0; |
| 1122 | struct cds_lfht_iter iter; |
| 1123 | struct ust_app_session *ua_sess; |
| 1124 | struct ust_app_channel *ua_chan; |
| 1125 | struct ltt_ust_stream *ustream; |
| 1126 | |
| 1127 | DBG("Starting tracing for ust app pid %d", app->key.pid); |
| 1128 | |
| 1129 | rcu_read_lock(); |
| 1130 | |
| 1131 | ua_sess = lookup_session_by_app(usess, app); |
| 1132 | if (ua_sess == NULL) { |
| 1133 | /* Only malloc can failed so something is really wrong */ |
| 1134 | goto error_rcu_unlock; |
| 1135 | } |
| 1136 | |
| 1137 | /* upon restart, we skip the setup, already done */ |
| 1138 | if (ua_sess->started) |
| 1139 | goto skip_setup; |
| 1140 | |
| 1141 | ret = create_ust_app_metadata(ua_sess, usess->pathname, app); |
| 1142 | if (ret < 0) { |
| 1143 | goto error_rcu_unlock; |
| 1144 | } |
| 1145 | |
| 1146 | /* For each channel */ |
| 1147 | cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) { |
| 1148 | /* Create all streams */ |
| 1149 | while (1) { |
| 1150 | /* Create UST stream */ |
| 1151 | ustream = zmalloc(sizeof(*ustream)); |
| 1152 | if (ustream == NULL) { |
| 1153 | PERROR("zmalloc ust stream"); |
| 1154 | goto error_rcu_unlock; |
| 1155 | } |
| 1156 | |
| 1157 | ret = ustctl_create_stream(app->key.sock, ua_chan->obj, |
| 1158 | &ustream->obj); |
| 1159 | if (ret < 0) { |
| 1160 | /* Got all streams */ |
| 1161 | break; |
| 1162 | } |
| 1163 | ustream->handle = ustream->obj->handle; |
| 1164 | |
| 1165 | /* Order is important */ |
| 1166 | cds_list_add_tail(&ustream->list, &ua_chan->streams.head); |
| 1167 | ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u", |
| 1168 | ua_sess->path, ua_chan->name, |
| 1169 | ua_chan->streams.count++); |
| 1170 | if (ret < 0) { |
| 1171 | PERROR("asprintf UST create stream"); |
| 1172 | continue; |
| 1173 | } |
| 1174 | DBG2("UST stream %d ready at %s", ua_chan->streams.count, |
| 1175 | ustream->pathname); |
| 1176 | } |
| 1177 | } |
| 1178 | |
| 1179 | /* Setup UST consumer socket and send fds to it */ |
| 1180 | ret = ust_consumer_send_session(ust_consumer_fd, ua_sess); |
| 1181 | if (ret < 0) { |
| 1182 | goto error_rcu_unlock; |
| 1183 | } |
| 1184 | ua_sess->started = 1; |
| 1185 | |
| 1186 | skip_setup: |
| 1187 | /* This start the UST tracing */ |
| 1188 | ret = ustctl_start_session(app->key.sock, ua_sess->handle); |
| 1189 | if (ret < 0) { |
| 1190 | ERR("Error starting tracing for app pid: %d", app->key.pid); |
| 1191 | goto error_rcu_unlock; |
| 1192 | } |
| 1193 | |
| 1194 | rcu_read_unlock(); |
| 1195 | |
| 1196 | /* Quiescent wait after starting trace */ |
| 1197 | ustctl_wait_quiescent(app->key.sock); |
| 1198 | |
| 1199 | return 0; |
| 1200 | |
| 1201 | error_rcu_unlock: |
| 1202 | rcu_read_unlock(); |
| 1203 | return -1; |
| 1204 | } |
| 1205 | |
| 1206 | /* |
| 1207 | * Stop tracing for a specific UST session and app. |
| 1208 | */ |
| 1209 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
| 1210 | { |
| 1211 | int ret = 0; |
| 1212 | struct ust_app_session *ua_sess; |
| 1213 | |
| 1214 | DBG("Stopping tracing for ust app pid %d", app->key.pid); |
| 1215 | |
| 1216 | rcu_read_lock(); |
| 1217 | |
| 1218 | ua_sess = lookup_session_by_app(usess, app); |
| 1219 | if (ua_sess == NULL) { |
| 1220 | /* Only malloc can failed so something is really wrong */ |
| 1221 | goto error_rcu_unlock; |
| 1222 | } |
| 1223 | |
| 1224 | #if 0 /* only useful when periodical flush will be supported */ |
| 1225 | /* need to keep a handle on shm in session for this. */ |
| 1226 | /* Flush all buffers before stopping */ |
| 1227 | ret = ustctl_flush_buffer(usess->sock, usess->metadata->obj); |
| 1228 | if (ret < 0) { |
| 1229 | ERR("UST metadata flush failed"); |
| 1230 | } |
| 1231 | |
| 1232 | cds_list_for_each_entry(ustchan, &usess->channels.head, list) { |
| 1233 | ret = ustctl_flush_buffer(usess->sock, ustchan->obj); |
| 1234 | if (ret < 0) { |
| 1235 | ERR("UST flush buffer error"); |
| 1236 | } |
| 1237 | } |
| 1238 | #endif |
| 1239 | |
| 1240 | /* This inhibits UST tracing */ |
| 1241 | ret = ustctl_stop_session(app->key.sock, ua_sess->handle); |
| 1242 | if (ret < 0) { |
| 1243 | ERR("Error stopping tracing for app pid: %d", app->key.pid); |
| 1244 | goto error_rcu_unlock; |
| 1245 | } |
| 1246 | |
| 1247 | rcu_read_unlock(); |
| 1248 | |
| 1249 | /* Quiescent wait after stopping trace */ |
| 1250 | ustctl_wait_quiescent(app->key.sock); |
| 1251 | |
| 1252 | return 0; |
| 1253 | |
| 1254 | error_rcu_unlock: |
| 1255 | rcu_read_unlock(); |
| 1256 | return -1; |
| 1257 | } |
| 1258 | |
| 1259 | /* |
| 1260 | * Destroy a specific UST session in apps. |
| 1261 | */ |
| 1262 | int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
| 1263 | { |
| 1264 | struct ust_app_session *ua_sess; |
| 1265 | struct lttng_ust_object_data obj; |
| 1266 | struct cds_lfht_iter iter; |
| 1267 | struct cds_lfht_node *node; |
| 1268 | |
| 1269 | DBG("Destroy tracing for ust app pid %d", app->key.pid); |
| 1270 | |
| 1271 | rcu_read_lock(); |
| 1272 | |
| 1273 | __lookup_session_by_app(usess, app, &iter); |
| 1274 | node = hashtable_iter_get_node(&iter); |
| 1275 | if (node == NULL) { |
| 1276 | /* Only malloc can failed so something is really wrong */ |
| 1277 | goto error_rcu_unlock; |
| 1278 | } |
| 1279 | ua_sess = caa_container_of(node, struct ust_app_session, node); |
| 1280 | hashtable_del(app->sessions, &iter); |
| 1281 | delete_ust_app_session(app->key.sock, ua_sess); |
| 1282 | obj.handle = ua_sess->handle; |
| 1283 | obj.shm_fd = -1; |
| 1284 | obj.wait_fd = -1; |
| 1285 | obj.memory_map_size = 0; |
| 1286 | ustctl_release_object(app->key.sock, &obj); |
| 1287 | |
| 1288 | rcu_read_unlock(); |
| 1289 | |
| 1290 | /* Quiescent wait after stopping trace */ |
| 1291 | ustctl_wait_quiescent(app->key.sock); |
| 1292 | |
| 1293 | return 0; |
| 1294 | |
| 1295 | error_rcu_unlock: |
| 1296 | rcu_read_unlock(); |
| 1297 | return -1; |
| 1298 | } |
| 1299 | |
| 1300 | /* |
| 1301 | * Start tracing for the UST session. |
| 1302 | */ |
| 1303 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
| 1304 | { |
| 1305 | int ret = 0; |
| 1306 | struct cds_lfht_iter iter; |
| 1307 | struct ust_app *app; |
| 1308 | |
| 1309 | DBG("Starting all UST traces"); |
| 1310 | |
| 1311 | rcu_read_lock(); |
| 1312 | |
| 1313 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1314 | ret = ust_app_start_trace(usess, app); |
| 1315 | if (ret < 0) { |
| 1316 | /* Continue to next apps even on error */ |
| 1317 | continue; |
| 1318 | } |
| 1319 | } |
| 1320 | |
| 1321 | rcu_read_unlock(); |
| 1322 | |
| 1323 | return 0; |
| 1324 | } |
| 1325 | |
| 1326 | /* |
| 1327 | * Start tracing for the UST session. |
| 1328 | */ |
| 1329 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) |
| 1330 | { |
| 1331 | int ret = 0; |
| 1332 | struct cds_lfht_iter iter; |
| 1333 | struct ust_app *app; |
| 1334 | |
| 1335 | DBG("Stopping all UST traces"); |
| 1336 | |
| 1337 | rcu_read_lock(); |
| 1338 | |
| 1339 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1340 | ret = ust_app_stop_trace(usess, app); |
| 1341 | if (ret < 0) { |
| 1342 | /* Continue to next apps even on error */ |
| 1343 | continue; |
| 1344 | } |
| 1345 | } |
| 1346 | |
| 1347 | rcu_read_unlock(); |
| 1348 | |
| 1349 | return 0; |
| 1350 | } |
| 1351 | |
| 1352 | /* |
| 1353 | * Destroy app UST session. |
| 1354 | */ |
| 1355 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) |
| 1356 | { |
| 1357 | int ret = 0; |
| 1358 | struct cds_lfht_iter iter; |
| 1359 | struct ust_app *app; |
| 1360 | |
| 1361 | DBG("Destroy all UST traces"); |
| 1362 | |
| 1363 | rcu_read_lock(); |
| 1364 | |
| 1365 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1366 | ret = ust_app_destroy_trace(usess, app); |
| 1367 | if (ret < 0) { |
| 1368 | /* Continue to next apps even on error */ |
| 1369 | continue; |
| 1370 | } |
| 1371 | } |
| 1372 | |
| 1373 | rcu_read_unlock(); |
| 1374 | |
| 1375 | return 0; |
| 1376 | } |
| 1377 | |
| 1378 | /* |
| 1379 | * Add channels/events from UST global domain to registered apps at sock. |
| 1380 | */ |
| 1381 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
| 1382 | { |
| 1383 | int ret = 0; |
| 1384 | struct cds_lfht_iter iter; |
| 1385 | struct ust_app *app; |
| 1386 | struct ust_app_session *ua_sess; |
| 1387 | struct ust_app_channel *ua_chan; |
| 1388 | struct ust_app_event *ua_event; |
| 1389 | |
| 1390 | if (usess == NULL) { |
| 1391 | ERR("No UST session on global update. Returning"); |
| 1392 | goto error; |
| 1393 | } |
| 1394 | |
| 1395 | DBG2("UST app global update for app sock %d for session uid %d", sock, |
| 1396 | usess->uid); |
| 1397 | |
| 1398 | rcu_read_lock(); |
| 1399 | |
| 1400 | app = find_app_by_sock(sock); |
| 1401 | if (app == NULL) { |
| 1402 | ERR("Failed to update app sock %d", sock); |
| 1403 | goto error; |
| 1404 | } |
| 1405 | |
| 1406 | ua_sess = create_ust_app_session(usess, app); |
| 1407 | if (ua_sess == NULL) { |
| 1408 | goto error; |
| 1409 | } |
| 1410 | |
| 1411 | /* |
| 1412 | * We can iterate safely here over all UST app session sicne the create ust |
| 1413 | * app session above made a shadow copy of the UST global domain from the |
| 1414 | * ltt ust session. |
| 1415 | */ |
| 1416 | cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) { |
| 1417 | ret = create_ust_channel(app, ua_sess, ua_chan); |
| 1418 | if (ret < 0) { |
| 1419 | /* FIXME: Should we quit here or continue... */ |
| 1420 | continue; |
| 1421 | } |
| 1422 | |
| 1423 | /* For each events */ |
| 1424 | cds_lfht_for_each_entry(ua_chan->events, &iter, ua_event, node) { |
| 1425 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
| 1426 | if (ret < 0) { |
| 1427 | /* FIXME: Should we quit here or continue... */ |
| 1428 | continue; |
| 1429 | } |
| 1430 | } |
| 1431 | } |
| 1432 | |
| 1433 | if (usess->start_trace) { |
| 1434 | ret = ust_app_start_trace(usess, app); |
| 1435 | if (ret < 0) { |
| 1436 | goto error; |
| 1437 | } |
| 1438 | |
| 1439 | DBG2("UST trace started for app pid %d", app->key.pid); |
| 1440 | } |
| 1441 | |
| 1442 | error: |
| 1443 | rcu_read_unlock(); |
| 1444 | return; |
| 1445 | } |