| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU General Public License |
| 6 | * as published by the Free Software Foundation; only version 2 |
| 7 | * of the License. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #define _GNU_SOURCE |
| 20 | #include <errno.h> |
| 21 | #include <pthread.h> |
| 22 | #include <stdio.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <string.h> |
| 25 | #include <sys/stat.h> |
| 26 | #include <sys/types.h> |
| 27 | #include <unistd.h> |
| 28 | |
| 29 | #include <urcu/compiler.h> |
| 30 | #include <lttngerr.h> |
| 31 | #include <lttng-share.h> |
| 32 | |
| 33 | #include "hashtable.h" |
| 34 | #include "ust-app.h" |
| 35 | #include "ust-consumer.h" |
| 36 | #include "ust-ctl.h" |
| 37 | |
| 38 | /* |
| 39 | * Delete ust app event safely. RCU read lock must be held before calling |
| 40 | * this function. |
| 41 | */ |
| 42 | static void delete_ust_app_event(int sock, struct ust_app_event *ua_event) |
| 43 | { |
| 44 | /* TODO : remove context */ |
| 45 | //struct ust_app_ctx *ltctx; |
| 46 | //cds_lfht_for_each_entry(lte->ctx, &iter, ltctx, node) { |
| 47 | // delete_ust_app_ctx(sock, ltctx); |
| 48 | //} |
| 49 | |
| 50 | if (ua_event->obj != NULL) { |
| 51 | ustctl_release_object(sock, ua_event->obj); |
| 52 | free(ua_event->obj); |
| 53 | } |
| 54 | free(ua_event); |
| 55 | } |
| 56 | |
| 57 | /* |
| 58 | * Delete ust app stream safely. RCU read lock must be held before calling |
| 59 | * this function. |
| 60 | */ |
| 61 | static void delete_ust_app_stream(int sock, struct ltt_ust_stream *stream) |
| 62 | { |
| 63 | ustctl_release_object(sock, stream->obj); |
| 64 | free(stream->obj); |
| 65 | free(stream); |
| 66 | } |
| 67 | |
| 68 | /* |
| 69 | * Delete ust app channel safely. RCU read lock must be held before calling |
| 70 | * this function. |
| 71 | */ |
| 72 | static void delete_ust_app_channel(int sock, struct ust_app_channel *ua_chan) |
| 73 | { |
| 74 | int ret; |
| 75 | struct cds_lfht_iter iter; |
| 76 | struct ust_app_event *ua_event; |
| 77 | struct ltt_ust_stream *stream, *stmp; |
| 78 | |
| 79 | cds_list_for_each_entry_safe(stream, stmp, &ua_chan->streams.head, list) { |
| 80 | cds_list_del(&stream->list); |
| 81 | delete_ust_app_stream(sock, stream); |
| 82 | } |
| 83 | |
| 84 | /* TODO : remove channel context */ |
| 85 | //cds_lfht_for_each_entry(ltc->ctx, &iter, ltctx, node) { |
| 86 | // ret = hashtable_del(ltc->ctx, &iter); |
| 87 | // assert(!ret); |
| 88 | // delete_ust_app_ctx(sock, ltctx); |
| 89 | //} |
| 90 | //ret = hashtable_destroy(ltc->ctx); |
| 91 | |
| 92 | cds_lfht_for_each_entry(ua_chan->events, &iter, ua_event, node) { |
| 93 | ret = hashtable_del(ua_chan->events, &iter); |
| 94 | assert(!ret); |
| 95 | delete_ust_app_event(sock, ua_event); |
| 96 | } |
| 97 | |
| 98 | ret = hashtable_destroy(ua_chan->events); |
| 99 | if (ret < 0) { |
| 100 | ERR("UST app destroy session hashtable failed"); |
| 101 | goto error; |
| 102 | } |
| 103 | |
| 104 | if (ua_chan->obj != NULL) { |
| 105 | ustctl_release_object(sock, ua_chan->obj); |
| 106 | free(ua_chan->obj); |
| 107 | } |
| 108 | free(ua_chan); |
| 109 | |
| 110 | error: |
| 111 | return; |
| 112 | } |
| 113 | |
| 114 | /* |
| 115 | * Delete ust app session safely. RCU read lock must be held before calling |
| 116 | * this function. |
| 117 | */ |
| 118 | static void delete_ust_app_session(int sock, |
| 119 | struct ust_app_session *ua_sess) |
| 120 | { |
| 121 | int ret; |
| 122 | struct cds_lfht_iter iter; |
| 123 | struct ust_app_channel *ua_chan; |
| 124 | |
| 125 | if (ua_sess->metadata) { |
| 126 | ustctl_release_object(sock, ua_sess->metadata->stream_obj); |
| 127 | free(ua_sess->metadata->stream_obj); |
| 128 | ustctl_release_object(sock, ua_sess->metadata->obj); |
| 129 | free(ua_sess->metadata->obj); |
| 130 | } |
| 131 | |
| 132 | cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) { |
| 133 | ret = hashtable_del(ua_sess->channels, &iter); |
| 134 | assert(!ret); |
| 135 | delete_ust_app_channel(sock, ua_chan); |
| 136 | } |
| 137 | |
| 138 | ret = hashtable_destroy(ua_sess->channels); |
| 139 | if (ret < 0) { |
| 140 | ERR("UST app destroy session hashtable failed"); |
| 141 | goto error; |
| 142 | } |
| 143 | |
| 144 | error: |
| 145 | return; |
| 146 | } |
| 147 | |
| 148 | /* |
| 149 | * Delete a traceable application structure from the global list. Never call |
| 150 | * this function outside of a call_rcu call. |
| 151 | */ |
| 152 | static void delete_ust_app(struct ust_app *app) |
| 153 | { |
| 154 | int ret; |
| 155 | struct cds_lfht_node *node; |
| 156 | struct cds_lfht_iter iter; |
| 157 | struct ust_app_session *ua_sess; |
| 158 | int sock; |
| 159 | |
| 160 | rcu_read_lock(); |
| 161 | |
| 162 | /* Remove from key hash table */ |
| 163 | node = hashtable_lookup(ust_app_sock_key_map, |
| 164 | (void *) ((unsigned long) app->key.sock), sizeof(void *), &iter); |
| 165 | if (node == NULL) { |
| 166 | /* Not suppose to happen */ |
| 167 | ERR("UST app key %d not found in key hash table", app->key.sock); |
| 168 | goto end; |
| 169 | } |
| 170 | |
| 171 | ret = hashtable_del(ust_app_sock_key_map, &iter); |
| 172 | if (ret) { |
| 173 | ERR("UST app unable to delete app sock %d from key hash table", |
| 174 | app->key.sock); |
| 175 | } else { |
| 176 | DBG2("UST app pair sock %d key %d deleted", |
| 177 | app->key.sock, app->key.pid); |
| 178 | } |
| 179 | |
| 180 | /* Socket is already closed at this point */ |
| 181 | |
| 182 | /* Delete ust app sessions info */ |
| 183 | sock = app->key.sock; |
| 184 | app->key.sock = -1; |
| 185 | |
| 186 | cds_lfht_for_each_entry(app->sessions, &iter, ua_sess, node) { |
| 187 | ret = hashtable_del(app->sessions, &iter); |
| 188 | assert(!ret); |
| 189 | delete_ust_app_session(app->key.sock, ua_sess); |
| 190 | } |
| 191 | |
| 192 | ret = hashtable_destroy(app->sessions); |
| 193 | if (ret < 0) { |
| 194 | ERR("UST app destroy session hashtable failed"); |
| 195 | goto end; |
| 196 | } |
| 197 | |
| 198 | /* |
| 199 | * Wait until we have removed the key from the sock hash table |
| 200 | * before closing this socket, otherwise an application could |
| 201 | * re-use the socket ID and race with the teardown, using the |
| 202 | * same hash table entry. |
| 203 | */ |
| 204 | close(sock); |
| 205 | |
| 206 | DBG2("UST app pid %d deleted", app->key.pid); |
| 207 | free(app); |
| 208 | end: |
| 209 | rcu_read_unlock(); |
| 210 | } |
| 211 | |
| 212 | /* |
| 213 | * URCU intermediate call to delete an UST app. |
| 214 | */ |
| 215 | static void delete_ust_app_rcu(struct rcu_head *head) |
| 216 | { |
| 217 | struct cds_lfht_node *node = |
| 218 | caa_container_of(head, struct cds_lfht_node, head); |
| 219 | struct ust_app *app = |
| 220 | caa_container_of(node, struct ust_app, node); |
| 221 | |
| 222 | delete_ust_app(app); |
| 223 | } |
| 224 | |
| 225 | /* |
| 226 | * Find an ust_app using the sock and return it. RCU read side lock must be |
| 227 | * held before calling this helper function. |
| 228 | */ |
| 229 | static struct ust_app *find_app_by_sock(int sock) |
| 230 | { |
| 231 | struct cds_lfht_node *node; |
| 232 | struct ust_app_key *key; |
| 233 | struct cds_lfht_iter iter; |
| 234 | |
| 235 | node = hashtable_lookup(ust_app_sock_key_map, |
| 236 | (void *)((unsigned long) sock), sizeof(void *), &iter); |
| 237 | if (node == NULL) { |
| 238 | DBG2("UST app find by sock %d key not found", sock); |
| 239 | goto error; |
| 240 | } |
| 241 | |
| 242 | key = caa_container_of(node, struct ust_app_key, node); |
| 243 | |
| 244 | node = hashtable_lookup(ust_app_ht, |
| 245 | (void *)((unsigned long) key->pid), sizeof(void *), &iter); |
| 246 | if (node == NULL) { |
| 247 | DBG2("UST app find by sock %d not found", sock); |
| 248 | goto error; |
| 249 | } |
| 250 | return caa_container_of(node, struct ust_app, node); |
| 251 | |
| 252 | error: |
| 253 | return NULL; |
| 254 | } |
| 255 | |
| 256 | /* |
| 257 | * Disable the specified event on to UST tracer for the UST session. |
| 258 | */ |
| 259 | static int disable_ust_event(struct ust_app *app, |
| 260 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) |
| 261 | { |
| 262 | int ret; |
| 263 | |
| 264 | ret = ustctl_disable(app->key.sock, ua_event->obj); |
| 265 | if (ret < 0) { |
| 266 | ERR("UST app event %s disable failed for app (pid: %d) " |
| 267 | "and session handle %d with ret %d", |
| 268 | ua_event->attr.name, app->key.pid, ua_sess->handle, ret); |
| 269 | goto error; |
| 270 | } |
| 271 | |
| 272 | DBG2("UST app event %s disabled successfully for app (pid: %d)", |
| 273 | ua_event->attr.name, app->key.pid); |
| 274 | |
| 275 | error: |
| 276 | return ret; |
| 277 | } |
| 278 | |
| 279 | /* |
| 280 | * Disable the specified channel on to UST tracer for the UST session. |
| 281 | */ |
| 282 | static int disable_ust_channel(struct ust_app *app, |
| 283 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) |
| 284 | { |
| 285 | int ret; |
| 286 | |
| 287 | ret = ustctl_disable(app->key.sock, ua_chan->obj); |
| 288 | if (ret < 0) { |
| 289 | ERR("UST app channel %s disable failed for app (pid: %d) " |
| 290 | "and session handle %d with ret %d", |
| 291 | ua_chan->name, app->key.pid, ua_sess->handle, ret); |
| 292 | goto error; |
| 293 | } |
| 294 | |
| 295 | DBG2("UST app channel %s disabled successfully for app (pid: %d)", |
| 296 | ua_chan->name, app->key.pid); |
| 297 | |
| 298 | error: |
| 299 | return ret; |
| 300 | } |
| 301 | |
| 302 | /* |
| 303 | * Enable the specified channel on to UST tracer for the UST session. |
| 304 | */ |
| 305 | static int enable_ust_channel(struct ust_app *app, |
| 306 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) |
| 307 | { |
| 308 | int ret; |
| 309 | |
| 310 | ret = ustctl_enable(app->key.sock, ua_chan->obj); |
| 311 | if (ret < 0) { |
| 312 | ERR("UST app channel %s enable failed for app (pid: %d) " |
| 313 | "and session handle %d with ret %d", |
| 314 | ua_chan->name, app->key.pid, ua_sess->handle, ret); |
| 315 | goto error; |
| 316 | } |
| 317 | |
| 318 | ua_chan->enabled = 1; |
| 319 | |
| 320 | DBG2("UST app channel %s enabled successfully for app (pid: %d)", |
| 321 | ua_chan->name, app->key.pid); |
| 322 | |
| 323 | error: |
| 324 | return ret; |
| 325 | } |
| 326 | |
| 327 | /* |
| 328 | * Enable the specified event on to UST tracer for the UST session. |
| 329 | */ |
| 330 | static int enable_ust_event(struct ust_app *app, |
| 331 | struct ust_app_session *ua_sess, struct ust_app_event *ua_event) |
| 332 | { |
| 333 | int ret; |
| 334 | |
| 335 | ret = ustctl_enable(app->key.sock, ua_event->obj); |
| 336 | if (ret < 0) { |
| 337 | ERR("UST app event %s enable failed for app (pid: %d) " |
| 338 | "and session handle %d with ret %d", |
| 339 | ua_event->attr.name, app->key.pid, ua_sess->handle, ret); |
| 340 | goto error; |
| 341 | } |
| 342 | |
| 343 | DBG2("UST app event %s enabled successfully for app (pid: %d)", |
| 344 | ua_event->attr.name, app->key.pid); |
| 345 | |
| 346 | error: |
| 347 | return ret; |
| 348 | } |
| 349 | |
| 350 | /* |
| 351 | * Open metadata onto the UST tracer for a UST session. |
| 352 | */ |
| 353 | static int open_ust_metadata(struct ust_app *app, |
| 354 | struct ust_app_session *ua_sess) |
| 355 | { |
| 356 | int ret; |
| 357 | struct lttng_ust_channel_attr uattr; |
| 358 | |
| 359 | uattr.overwrite = ua_sess->metadata->attr.overwrite; |
| 360 | uattr.subbuf_size = ua_sess->metadata->attr.subbuf_size; |
| 361 | uattr.num_subbuf = ua_sess->metadata->attr.num_subbuf; |
| 362 | uattr.switch_timer_interval = |
| 363 | ua_sess->metadata->attr.switch_timer_interval; |
| 364 | uattr.read_timer_interval = |
| 365 | ua_sess->metadata->attr.read_timer_interval; |
| 366 | uattr.output = ua_sess->metadata->attr.output; |
| 367 | |
| 368 | /* UST tracer metadata creation */ |
| 369 | ret = ustctl_open_metadata(app->key.sock, ua_sess->handle, &uattr, |
| 370 | &ua_sess->metadata->obj); |
| 371 | if (ret < 0) { |
| 372 | ERR("UST app open metadata failed for app pid:%d", |
| 373 | app->key.pid); |
| 374 | goto error; |
| 375 | } |
| 376 | |
| 377 | error: |
| 378 | return ret; |
| 379 | } |
| 380 | |
| 381 | /* |
| 382 | * Create stream onto the UST tracer for a UST session. |
| 383 | */ |
| 384 | static int create_ust_stream(struct ust_app *app, |
| 385 | struct ust_app_session *ua_sess) |
| 386 | { |
| 387 | int ret; |
| 388 | |
| 389 | ret = ustctl_create_stream(app->key.sock, ua_sess->metadata->obj, |
| 390 | &ua_sess->metadata->stream_obj); |
| 391 | if (ret < 0) { |
| 392 | ERR("UST create metadata stream failed"); |
| 393 | goto error; |
| 394 | } |
| 395 | |
| 396 | error: |
| 397 | return ret; |
| 398 | } |
| 399 | |
| 400 | /* |
| 401 | * Create the specified channel onto the UST tracer for a UST session. |
| 402 | */ |
| 403 | static int create_ust_channel(struct ust_app *app, |
| 404 | struct ust_app_session *ua_sess, struct ust_app_channel *ua_chan) |
| 405 | { |
| 406 | int ret; |
| 407 | |
| 408 | /* TODO: remove cast and use lttng-ust-abi.h */ |
| 409 | ret = ustctl_create_channel(app->key.sock, ua_sess->handle, |
| 410 | (struct lttng_ust_channel_attr *)&ua_chan->attr, &ua_chan->obj); |
| 411 | if (ret < 0) { |
| 412 | DBG("Error creating channel %s for app (pid: %d, sock: %d) " |
| 413 | "and session handle %d with ret %d", |
| 414 | ua_chan->name, app->key.pid, app->key.sock, |
| 415 | ua_sess->handle, ret); |
| 416 | goto error; |
| 417 | } |
| 418 | |
| 419 | ua_chan->handle = ua_chan->obj->handle; |
| 420 | ua_chan->attr.shm_fd = ua_chan->obj->shm_fd; |
| 421 | ua_chan->attr.wait_fd = ua_chan->obj->wait_fd; |
| 422 | ua_chan->attr.memory_map_size = ua_chan->obj->memory_map_size; |
| 423 | |
| 424 | DBG2("UST app channel %s created successfully for pid:%d and sock:%d", |
| 425 | ua_chan->name, app->key.pid, app->key.sock); |
| 426 | |
| 427 | /* If channel is not enabled, disable it on the tracer */ |
| 428 | if (!ua_chan->enabled) { |
| 429 | ret = disable_ust_channel(app, ua_sess, ua_chan); |
| 430 | if (ret < 0) { |
| 431 | goto error; |
| 432 | } |
| 433 | } |
| 434 | |
| 435 | error: |
| 436 | return ret; |
| 437 | } |
| 438 | |
| 439 | /* |
| 440 | * Create the specified event onto the UST tracer for a UST session. |
| 441 | */ |
| 442 | static |
| 443 | int create_ust_event(struct ust_app *app, struct ust_app_session *ua_sess, |
| 444 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event) |
| 445 | { |
| 446 | int ret = 0; |
| 447 | |
| 448 | /* Create UST event on tracer */ |
| 449 | ret = ustctl_create_event(app->key.sock, &ua_event->attr, ua_chan->obj, |
| 450 | &ua_event->obj); |
| 451 | if (ret < 0) { |
| 452 | ERR("Error ustctl create event %s for app pid: %d with ret %d", |
| 453 | ua_event->attr.name, app->key.pid, ret); |
| 454 | goto error; |
| 455 | } |
| 456 | |
| 457 | ua_event->handle = ua_event->obj->handle; |
| 458 | |
| 459 | DBG2("UST app event %s created successfully for pid:%d", |
| 460 | ua_event->attr.name, app->key.pid); |
| 461 | |
| 462 | /* If event not enabled, disable it on the tracer */ |
| 463 | if (!ua_event->enabled) { |
| 464 | ret = disable_ust_event(app, ua_sess, ua_event); |
| 465 | if (ret < 0) { |
| 466 | goto error; |
| 467 | } |
| 468 | } |
| 469 | |
| 470 | error: |
| 471 | return ret; |
| 472 | } |
| 473 | |
| 474 | /* |
| 475 | * Alloc new UST app session. |
| 476 | */ |
| 477 | static struct ust_app_session *alloc_ust_app_session(void) |
| 478 | { |
| 479 | struct ust_app_session *ua_sess; |
| 480 | |
| 481 | /* Init most of the default value by allocating and zeroing */ |
| 482 | ua_sess = zmalloc(sizeof(struct ust_app_session)); |
| 483 | if (ua_sess == NULL) { |
| 484 | PERROR("malloc"); |
| 485 | goto error; |
| 486 | } |
| 487 | |
| 488 | ua_sess->handle = -1; |
| 489 | ua_sess->channels = hashtable_new_str(0); |
| 490 | |
| 491 | return ua_sess; |
| 492 | |
| 493 | error: |
| 494 | return NULL; |
| 495 | } |
| 496 | |
| 497 | /* |
| 498 | * Alloc new UST app channel. |
| 499 | */ |
| 500 | static struct ust_app_channel *alloc_ust_app_channel(char *name, |
| 501 | struct lttng_ust_channel *attr) |
| 502 | { |
| 503 | struct ust_app_channel *ua_chan; |
| 504 | |
| 505 | /* Init most of the default value by allocating and zeroing */ |
| 506 | ua_chan = zmalloc(sizeof(struct ust_app_channel)); |
| 507 | if (ua_chan == NULL) { |
| 508 | PERROR("malloc"); |
| 509 | goto error; |
| 510 | } |
| 511 | |
| 512 | /* Setup channel name */ |
| 513 | strncpy(ua_chan->name, name, sizeof(ua_chan->name)); |
| 514 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; |
| 515 | |
| 516 | ua_chan->enabled = 1; |
| 517 | ua_chan->handle = -1; |
| 518 | ua_chan->ctx = hashtable_new(0); |
| 519 | ua_chan->events = hashtable_new_str(0); |
| 520 | hashtable_node_init(&ua_chan->node, (void *) ua_chan->name, |
| 521 | strlen(ua_chan->name)); |
| 522 | |
| 523 | CDS_INIT_LIST_HEAD(&ua_chan->streams.head); |
| 524 | |
| 525 | /* Copy attributes */ |
| 526 | if (attr) { |
| 527 | memcpy(&ua_chan->attr, attr, sizeof(ua_chan->attr)); |
| 528 | } |
| 529 | |
| 530 | DBG3("UST app channel %s allocated", ua_chan->name); |
| 531 | |
| 532 | return ua_chan; |
| 533 | |
| 534 | error: |
| 535 | return NULL; |
| 536 | } |
| 537 | |
| 538 | /* |
| 539 | * Alloc new UST app event. |
| 540 | */ |
| 541 | static struct ust_app_event *alloc_ust_app_event(char *name, |
| 542 | struct lttng_ust_event *attr) |
| 543 | { |
| 544 | struct ust_app_event *ua_event; |
| 545 | |
| 546 | /* Init most of the default value by allocating and zeroing */ |
| 547 | ua_event = zmalloc(sizeof(struct ust_app_event)); |
| 548 | if (ua_event == NULL) { |
| 549 | PERROR("malloc"); |
| 550 | goto error; |
| 551 | } |
| 552 | |
| 553 | ua_event->enabled = 1; |
| 554 | strncpy(ua_event->name, name, sizeof(ua_event->name)); |
| 555 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; |
| 556 | ua_event->ctx = hashtable_new(0); |
| 557 | hashtable_node_init(&ua_event->node, (void *) ua_event->name, |
| 558 | strlen(ua_event->name)); |
| 559 | |
| 560 | /* Copy attributes */ |
| 561 | if (attr) { |
| 562 | memcpy(&ua_event->attr, attr, sizeof(ua_event->attr)); |
| 563 | } |
| 564 | |
| 565 | DBG3("UST app event %s allocated", ua_event->name); |
| 566 | |
| 567 | return ua_event; |
| 568 | |
| 569 | error: |
| 570 | return NULL; |
| 571 | } |
| 572 | |
| 573 | /* |
| 574 | * Copy data between an UST app event and a LTT event. |
| 575 | */ |
| 576 | static void shadow_copy_event(struct ust_app_event *ua_event, |
| 577 | struct ltt_ust_event *uevent) |
| 578 | { |
| 579 | strncpy(ua_event->name, uevent->attr.name, sizeof(ua_event->name)); |
| 580 | ua_event->name[sizeof(ua_event->name) - 1] = '\0'; |
| 581 | |
| 582 | /* Copy event attributes */ |
| 583 | memcpy(&ua_event->attr, &uevent->attr, sizeof(ua_event->attr)); |
| 584 | |
| 585 | /* TODO: support copy context */ |
| 586 | } |
| 587 | |
| 588 | /* |
| 589 | * Copy data between an UST app channel and a LTT channel. |
| 590 | */ |
| 591 | static void shadow_copy_channel(struct ust_app_channel *ua_chan, |
| 592 | struct ltt_ust_channel *uchan) |
| 593 | { |
| 594 | struct cds_lfht_iter iter; |
| 595 | struct cds_lfht_node *ua_event_node; |
| 596 | struct ltt_ust_event *uevent; |
| 597 | struct ust_app_event *ua_event; |
| 598 | |
| 599 | DBG2("Shadow copy of UST app channel %s", ua_chan->name); |
| 600 | |
| 601 | strncpy(ua_chan->name, uchan->name, sizeof(ua_chan->name)); |
| 602 | ua_chan->name[sizeof(ua_chan->name) - 1] = '\0'; |
| 603 | /* Copy event attributes */ |
| 604 | memcpy(&ua_chan->attr, &uchan->attr, sizeof(ua_chan->attr)); |
| 605 | |
| 606 | /* TODO: support copy context */ |
| 607 | |
| 608 | /* Copy all events from ltt ust channel to ust app channel */ |
| 609 | cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) { |
| 610 | struct cds_lfht_iter uiter; |
| 611 | |
| 612 | ua_event_node = hashtable_lookup(ua_chan->events, |
| 613 | (void *) uevent->attr.name, strlen(uevent->attr.name), |
| 614 | &uiter); |
| 615 | if (ua_event_node == NULL) { |
| 616 | DBG2("UST event %s not found on shadow copy channel", |
| 617 | uevent->attr.name); |
| 618 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
| 619 | if (ua_event == NULL) { |
| 620 | continue; |
| 621 | } |
| 622 | shadow_copy_event(ua_event, uevent); |
| 623 | hashtable_add_unique(ua_chan->events, &ua_event->node); |
| 624 | } |
| 625 | } |
| 626 | |
| 627 | DBG3("Shadow copy channel done"); |
| 628 | } |
| 629 | |
| 630 | /* |
| 631 | * Copy data between a UST app session and a regular LTT session. |
| 632 | */ |
| 633 | static void shadow_copy_session(struct ust_app_session *ua_sess, |
| 634 | struct ltt_ust_session *usess, |
| 635 | struct ust_app *app) |
| 636 | { |
| 637 | struct cds_lfht_node *ua_chan_node; |
| 638 | struct cds_lfht_iter iter; |
| 639 | struct ltt_ust_channel *uchan; |
| 640 | struct ust_app_channel *ua_chan; |
| 641 | time_t rawtime; |
| 642 | struct tm *timeinfo; |
| 643 | char datetime[16]; |
| 644 | int ret; |
| 645 | |
| 646 | /* Get date and time for unique app path */ |
| 647 | time(&rawtime); |
| 648 | timeinfo = localtime(&rawtime); |
| 649 | strftime(datetime, sizeof(datetime), "%Y%m%d-%H%M%S", timeinfo); |
| 650 | |
| 651 | DBG2("Shadow copy of session handle %d", ua_sess->handle); |
| 652 | |
| 653 | ua_sess->uid = usess->uid; |
| 654 | |
| 655 | ret = snprintf(ua_sess->path, PATH_MAX, |
| 656 | "%s/%s-%d-%s", |
| 657 | usess->pathname, app->name, app->key.pid, |
| 658 | datetime); |
| 659 | if (ret < 0) { |
| 660 | PERROR("asprintf UST shadow copy session"); |
| 661 | /* TODO: We cannot return an error from here.. */ |
| 662 | assert(0); |
| 663 | } |
| 664 | |
| 665 | /* TODO: support all UST domain */ |
| 666 | |
| 667 | /* Iterate over all channels in global domain. */ |
| 668 | cds_lfht_for_each_entry(usess->domain_global.channels, &iter, |
| 669 | uchan, node) { |
| 670 | struct cds_lfht_iter uiter; |
| 671 | |
| 672 | ua_chan_node = hashtable_lookup(ua_sess->channels, |
| 673 | (void *)uchan->name, strlen(uchan->name), |
| 674 | &uiter); |
| 675 | if (ua_chan_node != NULL) { |
| 676 | continue; |
| 677 | } |
| 678 | |
| 679 | DBG2("Channel %s not found on shadow session copy, creating it", |
| 680 | uchan->name); |
| 681 | ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr); |
| 682 | if (ua_chan == NULL) { |
| 683 | /* malloc failed... continuing */ |
| 684 | continue; |
| 685 | } |
| 686 | |
| 687 | shadow_copy_channel(ua_chan, uchan); |
| 688 | hashtable_add_unique(ua_sess->channels, &ua_chan->node); |
| 689 | } |
| 690 | } |
| 691 | |
| 692 | /* |
| 693 | * Lookup sesison wrapper. |
| 694 | */ |
| 695 | static |
| 696 | void __lookup_session_by_app(struct ltt_ust_session *usess, |
| 697 | struct ust_app *app, struct cds_lfht_iter *iter) |
| 698 | { |
| 699 | /* Get right UST app session from app */ |
| 700 | (void) hashtable_lookup(app->sessions, |
| 701 | (void *) ((unsigned long) usess->uid), sizeof(void *), |
| 702 | iter); |
| 703 | } |
| 704 | |
| 705 | /* |
| 706 | * Return ust app session from the app session hashtable using the UST session |
| 707 | * uid. |
| 708 | */ |
| 709 | static struct ust_app_session *lookup_session_by_app( |
| 710 | struct ltt_ust_session *usess, struct ust_app *app) |
| 711 | { |
| 712 | struct cds_lfht_iter iter; |
| 713 | struct cds_lfht_node *node; |
| 714 | |
| 715 | __lookup_session_by_app(usess, app, &iter); |
| 716 | node = hashtable_iter_get_node(&iter); |
| 717 | if (node == NULL) { |
| 718 | goto error; |
| 719 | } |
| 720 | |
| 721 | return caa_container_of(node, struct ust_app_session, node); |
| 722 | |
| 723 | error: |
| 724 | return NULL; |
| 725 | } |
| 726 | |
| 727 | /* |
| 728 | * Create a UST session onto the tracer of app and add it the session |
| 729 | * hashtable. |
| 730 | * |
| 731 | * Return ust app session or NULL on error. |
| 732 | */ |
| 733 | static struct ust_app_session *create_ust_app_session( |
| 734 | struct ltt_ust_session *usess, struct ust_app *app) |
| 735 | { |
| 736 | int ret; |
| 737 | struct ust_app_session *ua_sess; |
| 738 | |
| 739 | ua_sess = lookup_session_by_app(usess, app); |
| 740 | if (ua_sess == NULL) { |
| 741 | DBG2("UST app pid: %d session uid %d not found, creating it", |
| 742 | app->key.pid, usess->uid); |
| 743 | ua_sess = alloc_ust_app_session(); |
| 744 | if (ua_sess == NULL) { |
| 745 | /* Only malloc can failed so something is really wrong */ |
| 746 | goto error; |
| 747 | } |
| 748 | shadow_copy_session(ua_sess, usess, app); |
| 749 | } |
| 750 | |
| 751 | if (ua_sess->handle == -1) { |
| 752 | ret = ustctl_create_session(app->key.sock); |
| 753 | if (ret < 0) { |
| 754 | ERR("Error creating session for app pid %d, sock %d", |
| 755 | app->key.pid, app->key.sock); |
| 756 | /* TODO: free() ua_sess */ |
| 757 | goto error; |
| 758 | } |
| 759 | |
| 760 | DBG2("UST app ustctl create session handle %d", ret); |
| 761 | ua_sess->handle = ret; |
| 762 | |
| 763 | /* Add ust app session to app's HT */ |
| 764 | hashtable_node_init(&ua_sess->node, |
| 765 | (void *)((unsigned long) ua_sess->uid), sizeof(void *)); |
| 766 | hashtable_add_unique(app->sessions, &ua_sess->node); |
| 767 | |
| 768 | DBG2("UST app session created successfully with handle %d", ret); |
| 769 | } |
| 770 | |
| 771 | return ua_sess; |
| 772 | |
| 773 | error: |
| 774 | return NULL; |
| 775 | } |
| 776 | |
| 777 | /* |
| 778 | * Enable on the tracer side a ust app event for the session and channel. |
| 779 | */ |
| 780 | static |
| 781 | int enable_ust_app_event(struct ust_app_session *ua_sess, |
| 782 | struct ust_app_event *ua_event, struct ust_app *app) |
| 783 | { |
| 784 | int ret; |
| 785 | |
| 786 | ret = enable_ust_event(app, ua_sess, ua_event); |
| 787 | if (ret < 0) { |
| 788 | goto error; |
| 789 | } |
| 790 | |
| 791 | ua_event->enabled = 1; |
| 792 | |
| 793 | error: |
| 794 | return ret; |
| 795 | } |
| 796 | |
| 797 | /* |
| 798 | * Disable on the tracer side a ust app event for the session and channel. |
| 799 | */ |
| 800 | static int disable_ust_app_event(struct ust_app_session *ua_sess, |
| 801 | struct ust_app_channel *ua_chan, struct ust_app_event *ua_event, |
| 802 | struct ust_app *app) |
| 803 | { |
| 804 | int ret; |
| 805 | |
| 806 | ret = disable_ust_event(app, ua_sess, ua_event); |
| 807 | if (ret < 0) { |
| 808 | goto error; |
| 809 | } |
| 810 | |
| 811 | ua_event->enabled = 0; |
| 812 | |
| 813 | error: |
| 814 | return ret; |
| 815 | } |
| 816 | |
| 817 | /* |
| 818 | * Lookup ust app channel for session and disable it on the tracer side. |
| 819 | */ |
| 820 | static |
| 821 | int disable_ust_app_channel(struct ust_app_session *ua_sess, |
| 822 | struct ust_app_channel *ua_chan, struct ust_app *app) |
| 823 | { |
| 824 | int ret; |
| 825 | |
| 826 | ret = disable_ust_channel(app, ua_sess, ua_chan); |
| 827 | if (ret < 0) { |
| 828 | goto error; |
| 829 | } |
| 830 | |
| 831 | ua_chan->enabled = 0; |
| 832 | |
| 833 | error: |
| 834 | return ret; |
| 835 | } |
| 836 | |
| 837 | /* |
| 838 | * Lookup ust app channel for session and enable it on the tracer side. |
| 839 | */ |
| 840 | static int enable_ust_app_channel(struct ust_app_session *ua_sess, |
| 841 | struct ltt_ust_channel *uchan, struct ust_app *app) |
| 842 | { |
| 843 | int ret = 0; |
| 844 | struct cds_lfht_iter iter; |
| 845 | struct cds_lfht_node *ua_chan_node; |
| 846 | struct ust_app_channel *ua_chan; |
| 847 | |
| 848 | ua_chan_node = hashtable_lookup(ua_sess->channels, |
| 849 | (void *)uchan->name, strlen(uchan->name), &iter); |
| 850 | if (ua_chan_node == NULL) { |
| 851 | DBG2("Unable to find channel %s in ust session uid %u", |
| 852 | uchan->name, ua_sess->uid); |
| 853 | goto error; |
| 854 | } |
| 855 | |
| 856 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
| 857 | |
| 858 | ret = enable_ust_channel(app, ua_sess, ua_chan); |
| 859 | if (ret < 0) { |
| 860 | goto error; |
| 861 | } |
| 862 | |
| 863 | error: |
| 864 | return ret; |
| 865 | } |
| 866 | |
| 867 | /* |
| 868 | * Create UST app channel and create it on the tracer. |
| 869 | */ |
| 870 | static struct ust_app_channel *create_ust_app_channel( |
| 871 | struct ust_app_session *ua_sess, struct ltt_ust_channel *uchan, |
| 872 | struct ust_app *app) |
| 873 | { |
| 874 | int ret = 0; |
| 875 | struct cds_lfht_iter iter; |
| 876 | struct cds_lfht_node *ua_chan_node; |
| 877 | struct ust_app_channel *ua_chan; |
| 878 | |
| 879 | /* Lookup channel in the ust app session */ |
| 880 | ua_chan_node = hashtable_lookup(ua_sess->channels, |
| 881 | (void *)uchan->name, strlen(uchan->name), &iter); |
| 882 | if (ua_chan_node == NULL) { |
| 883 | DBG2("Unable to find channel %s in ust session uid %u", |
| 884 | uchan->name, ua_sess->uid); |
| 885 | ua_chan = alloc_ust_app_channel(uchan->name, &uchan->attr); |
| 886 | if (ua_chan == NULL) { |
| 887 | goto error; |
| 888 | } |
| 889 | shadow_copy_channel(ua_chan, uchan); |
| 890 | |
| 891 | hashtable_add_unique(ua_sess->channels, &ua_chan->node); |
| 892 | } else { |
| 893 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
| 894 | } |
| 895 | |
| 896 | ret = create_ust_channel(app, ua_sess, ua_chan); |
| 897 | if (ret < 0) { |
| 898 | goto error; |
| 899 | } |
| 900 | |
| 901 | return ua_chan; |
| 902 | |
| 903 | error: |
| 904 | return NULL; |
| 905 | } |
| 906 | |
| 907 | /* |
| 908 | * Create UST app event and create it on the tracer side. |
| 909 | */ |
| 910 | static |
| 911 | int create_ust_app_event(struct ust_app_session *ua_sess, |
| 912 | struct ust_app_channel *ua_chan, struct ltt_ust_event *uevent, |
| 913 | struct ust_app *app) |
| 914 | { |
| 915 | int ret = 0; |
| 916 | struct cds_lfht_iter iter; |
| 917 | struct cds_lfht_node *ua_event_node; |
| 918 | struct ust_app_event *ua_event; |
| 919 | |
| 920 | /* Get event node */ |
| 921 | ua_event_node = hashtable_lookup(ua_chan->events, |
| 922 | (void *)uevent->attr.name, strlen(uevent->attr.name), &iter); |
| 923 | if (ua_event_node != NULL) { |
| 924 | ERR("UST app event %s already exist. Stopping creation.", |
| 925 | uevent->attr.name); |
| 926 | goto end; |
| 927 | } |
| 928 | |
| 929 | /* Does not exist so create one */ |
| 930 | ua_event = alloc_ust_app_event(uevent->attr.name, &uevent->attr); |
| 931 | if (ua_event == NULL) { |
| 932 | /* Only malloc can failed so something is really wrong */ |
| 933 | ret = -ENOMEM; |
| 934 | goto error; |
| 935 | } |
| 936 | shadow_copy_event(ua_event, uevent); |
| 937 | |
| 938 | /* Create it on the tracer side */ |
| 939 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
| 940 | if (ret < 0) { |
| 941 | delete_ust_app_event(app->key.sock, ua_event); |
| 942 | goto error; |
| 943 | } |
| 944 | |
| 945 | ua_event->enabled = 1; |
| 946 | |
| 947 | hashtable_add_unique(ua_chan->events, &ua_event->node); |
| 948 | |
| 949 | end: |
| 950 | error: |
| 951 | return ret; |
| 952 | } |
| 953 | |
| 954 | /* |
| 955 | * Create UST metadata and open it on the tracer side. |
| 956 | */ |
| 957 | static int create_ust_app_metadata(struct ust_app_session *ua_sess, |
| 958 | char *pathname, struct ust_app *app) |
| 959 | { |
| 960 | int ret = 0; |
| 961 | |
| 962 | if (ua_sess->metadata == NULL) { |
| 963 | /* Allocate UST metadata */ |
| 964 | ua_sess->metadata = trace_ust_create_metadata(pathname); |
| 965 | if (ua_sess->metadata == NULL) { |
| 966 | ERR("UST app session %d creating metadata failed", |
| 967 | ua_sess->handle); |
| 968 | goto error; |
| 969 | } |
| 970 | |
| 971 | ret = open_ust_metadata(app, ua_sess); |
| 972 | if (ret < 0) { |
| 973 | goto error; |
| 974 | } |
| 975 | |
| 976 | DBG2("UST metadata opened for app pid %d", app->key.pid); |
| 977 | } |
| 978 | |
| 979 | /* Open UST metadata stream */ |
| 980 | if (ua_sess->metadata->stream_obj == NULL) { |
| 981 | ret = create_ust_stream(app, ua_sess); |
| 982 | if (ret < 0) { |
| 983 | goto error; |
| 984 | } |
| 985 | |
| 986 | ret = mkdir(ua_sess->path, S_IRWXU | S_IRWXG); |
| 987 | if (ret < 0) { |
| 988 | PERROR("mkdir UST metadata"); |
| 989 | goto error; |
| 990 | } |
| 991 | |
| 992 | ret = snprintf(ua_sess->metadata->pathname, PATH_MAX, |
| 993 | "%s/metadata", ua_sess->path); |
| 994 | if (ret < 0) { |
| 995 | PERROR("asprintf UST create stream"); |
| 996 | goto error; |
| 997 | } |
| 998 | |
| 999 | DBG2("UST metadata stream object created for app pid %d", |
| 1000 | app->key.pid); |
| 1001 | } else { |
| 1002 | ERR("Attempting to create stream without metadata opened"); |
| 1003 | goto error; |
| 1004 | } |
| 1005 | |
| 1006 | return 0; |
| 1007 | |
| 1008 | error: |
| 1009 | return -1; |
| 1010 | } |
| 1011 | |
| 1012 | /* |
| 1013 | * Return pointer to traceable apps list. |
| 1014 | */ |
| 1015 | struct cds_lfht *ust_app_get_ht(void) |
| 1016 | { |
| 1017 | return ust_app_ht; |
| 1018 | } |
| 1019 | |
| 1020 | /* |
| 1021 | * Return ust app pointer or NULL if not found. |
| 1022 | */ |
| 1023 | struct ust_app *ust_app_find_by_pid(pid_t pid) |
| 1024 | { |
| 1025 | struct cds_lfht_node *node; |
| 1026 | struct cds_lfht_iter iter; |
| 1027 | |
| 1028 | rcu_read_lock(); |
| 1029 | node = hashtable_lookup(ust_app_ht, |
| 1030 | (void *)((unsigned long) pid), sizeof(void *), &iter); |
| 1031 | if (node == NULL) { |
| 1032 | DBG2("UST app no found with pid %d", pid); |
| 1033 | goto error; |
| 1034 | } |
| 1035 | rcu_read_unlock(); |
| 1036 | |
| 1037 | DBG2("Found UST app by pid %d", pid); |
| 1038 | |
| 1039 | return caa_container_of(node, struct ust_app, node); |
| 1040 | |
| 1041 | error: |
| 1042 | rcu_read_unlock(); |
| 1043 | return NULL; |
| 1044 | } |
| 1045 | |
| 1046 | /* |
| 1047 | * Using pid and uid (of the app), allocate a new ust_app struct and |
| 1048 | * add it to the global traceable app list. |
| 1049 | * |
| 1050 | * On success, return 0, else return malloc -ENOMEM, or -EINVAL if app |
| 1051 | * bitness is not supported. |
| 1052 | */ |
| 1053 | int ust_app_register(struct ust_register_msg *msg, int sock) |
| 1054 | { |
| 1055 | struct ust_app *lta; |
| 1056 | |
| 1057 | if ((msg->bits_per_long == 64 && ust_consumerd64_fd == -EINVAL) |
| 1058 | || (msg->bits_per_long == 32 && ust_consumerd32_fd == -EINVAL)) { |
| 1059 | ERR("Registration failed: application \"%s\" (pid: %d) has " |
| 1060 | "%d-bit long, but no consumerd for this long size is available.\n", |
| 1061 | msg->name, msg->pid, msg->bits_per_long); |
| 1062 | close(sock); |
| 1063 | return -EINVAL; |
| 1064 | } |
| 1065 | lta = zmalloc(sizeof(struct ust_app)); |
| 1066 | if (lta == NULL) { |
| 1067 | PERROR("malloc"); |
| 1068 | return -ENOMEM; |
| 1069 | } |
| 1070 | |
| 1071 | lta->ppid = msg->ppid; |
| 1072 | lta->uid = msg->uid; |
| 1073 | lta->gid = msg->gid; |
| 1074 | lta->bits_per_long = msg->bits_per_long; |
| 1075 | lta->v_major = msg->major; |
| 1076 | lta->v_minor = msg->minor; |
| 1077 | strncpy(lta->name, msg->name, sizeof(lta->name)); |
| 1078 | lta->name[16] = '\0'; |
| 1079 | lta->sessions = hashtable_new(0); |
| 1080 | |
| 1081 | /* Set key map */ |
| 1082 | lta->key.pid = msg->pid; |
| 1083 | hashtable_node_init(<a->node, (void *)((unsigned long)lta->key.pid), |
| 1084 | sizeof(void *)); |
| 1085 | lta->key.sock = sock; |
| 1086 | hashtable_node_init(<a->key.node, (void *)((unsigned long)lta->key.sock), |
| 1087 | sizeof(void *)); |
| 1088 | |
| 1089 | rcu_read_lock(); |
| 1090 | hashtable_add_unique(ust_app_sock_key_map, <a->key.node); |
| 1091 | hashtable_add_unique(ust_app_ht, <a->node); |
| 1092 | rcu_read_unlock(); |
| 1093 | |
| 1094 | DBG("App registered with pid:%d ppid:%d uid:%d gid:%d sock:%d name:%s" |
| 1095 | " (version %d.%d)", lta->key.pid, lta->ppid, lta->uid, lta->gid, |
| 1096 | lta->key.sock, lta->name, lta->v_major, lta->v_minor); |
| 1097 | |
| 1098 | return 0; |
| 1099 | } |
| 1100 | |
| 1101 | /* |
| 1102 | * Unregister app by removing it from the global traceable app list and freeing |
| 1103 | * the data struct. |
| 1104 | * |
| 1105 | * The socket is already closed at this point so no close to sock. |
| 1106 | */ |
| 1107 | void ust_app_unregister(int sock) |
| 1108 | { |
| 1109 | struct ust_app *lta; |
| 1110 | struct cds_lfht_node *node; |
| 1111 | struct cds_lfht_iter iter; |
| 1112 | int ret; |
| 1113 | |
| 1114 | rcu_read_lock(); |
| 1115 | lta = find_app_by_sock(sock); |
| 1116 | if (lta == NULL) { |
| 1117 | ERR("Unregister app sock %d not found!", sock); |
| 1118 | goto error; |
| 1119 | } |
| 1120 | |
| 1121 | DBG("PID %d unregistering with sock %d", lta->key.pid, sock); |
| 1122 | |
| 1123 | /* Get the node reference for a call_rcu */ |
| 1124 | node = hashtable_lookup(ust_app_ht, |
| 1125 | (void *)((unsigned long) lta->key.pid), sizeof(void *), &iter); |
| 1126 | if (node == NULL) { |
| 1127 | ERR("Unable to find app sock %d by pid %d", sock, lta->key.pid); |
| 1128 | goto error; |
| 1129 | } |
| 1130 | |
| 1131 | ret = hashtable_del(ust_app_ht, &iter); |
| 1132 | assert(!ret); |
| 1133 | call_rcu(&node->head, delete_ust_app_rcu); |
| 1134 | error: |
| 1135 | rcu_read_unlock(); |
| 1136 | return; |
| 1137 | } |
| 1138 | |
| 1139 | /* |
| 1140 | * Return traceable_app_count |
| 1141 | */ |
| 1142 | unsigned long ust_app_list_count(void) |
| 1143 | { |
| 1144 | unsigned long count; |
| 1145 | |
| 1146 | rcu_read_lock(); |
| 1147 | count = hashtable_get_count(ust_app_ht); |
| 1148 | rcu_read_unlock(); |
| 1149 | |
| 1150 | return count; |
| 1151 | } |
| 1152 | |
| 1153 | /* |
| 1154 | * Fill events array with all events name of all registered apps. |
| 1155 | */ |
| 1156 | int ust_app_list_events(struct lttng_event **events) |
| 1157 | { |
| 1158 | int ret, handle; |
| 1159 | size_t nbmem, count = 0; |
| 1160 | struct cds_lfht_iter iter; |
| 1161 | struct ust_app *app; |
| 1162 | struct lttng_event *tmp; |
| 1163 | |
| 1164 | nbmem = UST_APP_EVENT_LIST_SIZE; |
| 1165 | tmp = zmalloc(nbmem * sizeof(struct lttng_event)); |
| 1166 | if (tmp == NULL) { |
| 1167 | PERROR("zmalloc ust app events"); |
| 1168 | ret = -ENOMEM; |
| 1169 | goto error; |
| 1170 | } |
| 1171 | |
| 1172 | rcu_read_lock(); |
| 1173 | |
| 1174 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1175 | handle = ustctl_tracepoint_list(app->key.sock); |
| 1176 | if (handle < 0) { |
| 1177 | ERR("UST app list events getting handle failed for app pid %d", |
| 1178 | app->key.pid); |
| 1179 | continue; |
| 1180 | } |
| 1181 | |
| 1182 | while ((ret = ustctl_tracepoint_list_get(app->key.sock, handle, |
| 1183 | tmp[count].name)) != -ENOENT) { |
| 1184 | if (count > nbmem) { |
| 1185 | DBG2("Reallocating event list from %zu to %zu bytes", nbmem, |
| 1186 | nbmem + UST_APP_EVENT_LIST_SIZE); |
| 1187 | nbmem += UST_APP_EVENT_LIST_SIZE; |
| 1188 | tmp = realloc(tmp, nbmem); |
| 1189 | if (tmp == NULL) { |
| 1190 | PERROR("realloc ust app events"); |
| 1191 | ret = -ENOMEM; |
| 1192 | goto rcu_error; |
| 1193 | } |
| 1194 | } |
| 1195 | |
| 1196 | tmp[count].type = LTTNG_UST_TRACEPOINT; |
| 1197 | tmp[count].pid = app->key.pid; |
| 1198 | tmp[count].enabled = -1; |
| 1199 | count++; |
| 1200 | } |
| 1201 | } |
| 1202 | |
| 1203 | ret = count; |
| 1204 | *events = tmp; |
| 1205 | |
| 1206 | DBG2("UST app list events done (%zu events)", count); |
| 1207 | |
| 1208 | rcu_error: |
| 1209 | rcu_read_unlock(); |
| 1210 | error: |
| 1211 | return ret; |
| 1212 | } |
| 1213 | |
| 1214 | /* |
| 1215 | * Free and clean all traceable apps of the global list. |
| 1216 | */ |
| 1217 | void ust_app_clean_list(void) |
| 1218 | { |
| 1219 | int ret; |
| 1220 | struct cds_lfht_iter iter; |
| 1221 | struct ust_app *app; |
| 1222 | |
| 1223 | DBG2("UST app cleaning registered apps hash table"); |
| 1224 | |
| 1225 | rcu_read_lock(); |
| 1226 | |
| 1227 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1228 | ret = hashtable_del(ust_app_ht, &iter); |
| 1229 | assert(!ret); |
| 1230 | call_rcu(&iter.node->head, delete_ust_app_rcu); |
| 1231 | } |
| 1232 | |
| 1233 | hashtable_destroy(ust_app_ht); |
| 1234 | hashtable_destroy(ust_app_sock_key_map); |
| 1235 | |
| 1236 | rcu_read_unlock(); |
| 1237 | } |
| 1238 | |
| 1239 | /* |
| 1240 | * Init UST app hash table. |
| 1241 | */ |
| 1242 | void ust_app_ht_alloc(void) |
| 1243 | { |
| 1244 | ust_app_ht = hashtable_new(0); |
| 1245 | ust_app_sock_key_map = hashtable_new(0); |
| 1246 | } |
| 1247 | |
| 1248 | /* |
| 1249 | * For a specific UST session, disable the channel for all registered apps. |
| 1250 | */ |
| 1251 | int ust_app_disable_channel_glb(struct ltt_ust_session *usess, |
| 1252 | struct ltt_ust_channel *uchan) |
| 1253 | { |
| 1254 | int ret = 0; |
| 1255 | struct cds_lfht_iter iter; |
| 1256 | struct cds_lfht_node *ua_chan_node; |
| 1257 | struct ust_app *app; |
| 1258 | struct ust_app_session *ua_sess; |
| 1259 | struct ust_app_channel *ua_chan; |
| 1260 | |
| 1261 | if (usess == NULL || uchan == NULL) { |
| 1262 | ERR("Disabling UST global channel with NULL values"); |
| 1263 | ret = -1; |
| 1264 | goto error; |
| 1265 | } |
| 1266 | |
| 1267 | DBG2("UST app disabling channel %s from global domain for session uid %d", |
| 1268 | uchan->name, usess->uid); |
| 1269 | |
| 1270 | rcu_read_lock(); |
| 1271 | |
| 1272 | /* For every registered applications */ |
| 1273 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1274 | ua_sess = lookup_session_by_app(usess, app); |
| 1275 | if (ua_sess == NULL) { |
| 1276 | continue; |
| 1277 | } |
| 1278 | |
| 1279 | /* Get channel */ |
| 1280 | ua_chan_node = hashtable_lookup(ua_sess->channels, |
| 1281 | (void *)uchan->name, strlen(uchan->name), &iter); |
| 1282 | /* If the session if found for the app, the channel must be there */ |
| 1283 | assert(ua_chan_node); |
| 1284 | |
| 1285 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
| 1286 | /* The channel must not be already disabled */ |
| 1287 | assert(ua_chan->enabled == 1); |
| 1288 | |
| 1289 | /* Disable channel onto application */ |
| 1290 | ret = disable_ust_app_channel(ua_sess, ua_chan, app); |
| 1291 | if (ret < 0) { |
| 1292 | /* XXX: We might want to report this error at some point... */ |
| 1293 | continue; |
| 1294 | } |
| 1295 | } |
| 1296 | |
| 1297 | rcu_read_unlock(); |
| 1298 | |
| 1299 | error: |
| 1300 | return ret; |
| 1301 | } |
| 1302 | |
| 1303 | /* |
| 1304 | * For a specific UST session, enable the channel for all registered apps. |
| 1305 | */ |
| 1306 | int ust_app_enable_channel_glb(struct ltt_ust_session *usess, |
| 1307 | struct ltt_ust_channel *uchan) |
| 1308 | { |
| 1309 | int ret = 0; |
| 1310 | struct cds_lfht_iter iter; |
| 1311 | struct ust_app *app; |
| 1312 | struct ust_app_session *ua_sess; |
| 1313 | |
| 1314 | if (usess == NULL || uchan == NULL) { |
| 1315 | ERR("Adding UST global channel to NULL values"); |
| 1316 | ret = -1; |
| 1317 | goto error; |
| 1318 | } |
| 1319 | |
| 1320 | DBG2("UST app enabling channel %s to global domain for session uid %d", |
| 1321 | uchan->name, usess->uid); |
| 1322 | |
| 1323 | rcu_read_lock(); |
| 1324 | |
| 1325 | /* For every registered applications */ |
| 1326 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1327 | ua_sess = lookup_session_by_app(usess, app); |
| 1328 | if (ua_sess == NULL) { |
| 1329 | continue; |
| 1330 | } |
| 1331 | |
| 1332 | /* Enable channel onto application */ |
| 1333 | ret = enable_ust_app_channel(ua_sess, uchan, app); |
| 1334 | if (ret < 0) { |
| 1335 | /* XXX: We might want to report this error at some point... */ |
| 1336 | continue; |
| 1337 | } |
| 1338 | } |
| 1339 | |
| 1340 | rcu_read_unlock(); |
| 1341 | |
| 1342 | error: |
| 1343 | return ret; |
| 1344 | } |
| 1345 | |
| 1346 | /* |
| 1347 | * Disable an event in a channel and for a specific session. |
| 1348 | */ |
| 1349 | int ust_app_disable_event_glb(struct ltt_ust_session *usess, |
| 1350 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
| 1351 | { |
| 1352 | int ret = 0; |
| 1353 | struct cds_lfht_iter iter, uiter; |
| 1354 | struct cds_lfht_node *ua_chan_node, *ua_event_node; |
| 1355 | struct ust_app *app; |
| 1356 | struct ust_app_session *ua_sess; |
| 1357 | struct ust_app_channel *ua_chan; |
| 1358 | struct ust_app_event *ua_event; |
| 1359 | |
| 1360 | DBG("UST app disabling event %s for all apps in channel " |
| 1361 | "%s for session uid %d", uevent->attr.name, uchan->name, usess->uid); |
| 1362 | |
| 1363 | rcu_read_lock(); |
| 1364 | |
| 1365 | /* For all registered applications */ |
| 1366 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1367 | ua_sess = lookup_session_by_app(usess, app); |
| 1368 | if (ua_sess == NULL) { |
| 1369 | /* Next app */ |
| 1370 | continue; |
| 1371 | } |
| 1372 | |
| 1373 | /* Lookup channel in the ust app session */ |
| 1374 | ua_chan_node = hashtable_lookup(ua_sess->channels, |
| 1375 | (void *)uchan->name, strlen(uchan->name), &uiter); |
| 1376 | if (ua_chan_node == NULL) { |
| 1377 | DBG2("Channel %s not found in session uid %d for app pid %d." |
| 1378 | "Skipping", uchan->name, usess->uid, app->key.pid); |
| 1379 | continue; |
| 1380 | } |
| 1381 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
| 1382 | |
| 1383 | ua_event_node = hashtable_lookup(ua_chan->events, |
| 1384 | (void *)uevent->attr.name, strlen(uevent->attr.name), &uiter); |
| 1385 | if (ua_event_node == NULL) { |
| 1386 | DBG2("Event %s not found in channel %s for app pid %d." |
| 1387 | "Skipping", uevent->attr.name, uchan->name, app->key.pid); |
| 1388 | continue; |
| 1389 | } |
| 1390 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); |
| 1391 | |
| 1392 | ret = disable_ust_app_event(ua_sess, ua_chan, ua_event, app); |
| 1393 | if (ret < 0) { |
| 1394 | /* XXX: Report error someday... */ |
| 1395 | continue; |
| 1396 | } |
| 1397 | } |
| 1398 | |
| 1399 | rcu_read_unlock(); |
| 1400 | |
| 1401 | return ret; |
| 1402 | } |
| 1403 | |
| 1404 | /* |
| 1405 | * For a specific UST session and UST channel, the event for all |
| 1406 | * registered apps. |
| 1407 | */ |
| 1408 | int ust_app_disable_all_event_glb(struct ltt_ust_session *usess, |
| 1409 | struct ltt_ust_channel *uchan) |
| 1410 | { |
| 1411 | int ret = 0; |
| 1412 | struct cds_lfht_iter iter, uiter; |
| 1413 | struct cds_lfht_node *ua_chan_node; |
| 1414 | struct ust_app *app; |
| 1415 | struct ust_app_session *ua_sess; |
| 1416 | struct ust_app_channel *ua_chan; |
| 1417 | struct ust_app_event *ua_event; |
| 1418 | |
| 1419 | DBG("UST app disabling all event for all apps in channel " |
| 1420 | "%s for session uid %d", uchan->name, usess->uid); |
| 1421 | |
| 1422 | rcu_read_lock(); |
| 1423 | |
| 1424 | /* For all registered applications */ |
| 1425 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1426 | ua_sess = lookup_session_by_app(usess, app); |
| 1427 | /* If ua_sess is NULL, there is a code flow error */ |
| 1428 | assert(ua_sess); |
| 1429 | |
| 1430 | /* Lookup channel in the ust app session */ |
| 1431 | ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name, |
| 1432 | strlen(uchan->name), &uiter); |
| 1433 | /* If the channel is not found, there is a code flow error */ |
| 1434 | assert(ua_chan_node); |
| 1435 | |
| 1436 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
| 1437 | |
| 1438 | /* Disable each events of channel */ |
| 1439 | cds_lfht_for_each_entry(ua_chan->events, &uiter, ua_event, node) { |
| 1440 | ret = disable_ust_app_event(ua_sess, ua_chan, ua_event, app); |
| 1441 | if (ret < 0) { |
| 1442 | /* XXX: Report error someday... */ |
| 1443 | continue; |
| 1444 | } |
| 1445 | } |
| 1446 | } |
| 1447 | |
| 1448 | rcu_read_unlock(); |
| 1449 | |
| 1450 | return ret; |
| 1451 | } |
| 1452 | |
| 1453 | /* |
| 1454 | * For a specific UST session, create the channel for all registered apps. |
| 1455 | */ |
| 1456 | int ust_app_create_channel_glb(struct ltt_ust_session *usess, |
| 1457 | struct ltt_ust_channel *uchan) |
| 1458 | { |
| 1459 | int ret = 0; |
| 1460 | struct cds_lfht_iter iter; |
| 1461 | struct ust_app *app; |
| 1462 | struct ust_app_session *ua_sess; |
| 1463 | struct ust_app_channel *ua_chan; |
| 1464 | |
| 1465 | if (usess == NULL || uchan == NULL) { |
| 1466 | ERR("Adding UST global channel to NULL values"); |
| 1467 | ret = -1; |
| 1468 | goto error; |
| 1469 | } |
| 1470 | |
| 1471 | DBG2("UST app adding channel %s to global domain for session uid %d", |
| 1472 | uchan->name, usess->uid); |
| 1473 | |
| 1474 | rcu_read_lock(); |
| 1475 | |
| 1476 | /* For every registered applications */ |
| 1477 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1478 | /* |
| 1479 | * Create session on the tracer side and add it to app session HT. Note |
| 1480 | * that if session exist, it will simply return a pointer to the ust |
| 1481 | * app session. |
| 1482 | */ |
| 1483 | ua_sess = create_ust_app_session(usess, app); |
| 1484 | if (ua_sess == NULL) { |
| 1485 | continue; |
| 1486 | } |
| 1487 | |
| 1488 | /* Create channel onto application */ |
| 1489 | ua_chan = create_ust_app_channel(ua_sess, uchan, app); |
| 1490 | if (ua_chan == NULL) { |
| 1491 | continue; |
| 1492 | } |
| 1493 | } |
| 1494 | |
| 1495 | rcu_read_unlock(); |
| 1496 | |
| 1497 | error: |
| 1498 | return ret; |
| 1499 | } |
| 1500 | |
| 1501 | /* |
| 1502 | * Enable event for a specific session and channel on the tracer. |
| 1503 | */ |
| 1504 | int ust_app_enable_event_glb(struct ltt_ust_session *usess, |
| 1505 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
| 1506 | { |
| 1507 | int ret = 0; |
| 1508 | struct cds_lfht_iter iter, uiter; |
| 1509 | struct cds_lfht_node *ua_chan_node, *ua_event_node; |
| 1510 | struct ust_app *app; |
| 1511 | struct ust_app_session *ua_sess; |
| 1512 | struct ust_app_channel *ua_chan; |
| 1513 | struct ust_app_event *ua_event; |
| 1514 | |
| 1515 | DBG("UST app enabling event %s for all apps for session uid %d", |
| 1516 | uevent->attr.name, usess->uid); |
| 1517 | |
| 1518 | /* |
| 1519 | * NOTE: At this point, this function is called only if the session and |
| 1520 | * channel passed are already created for all apps. and enabled on the |
| 1521 | * tracer also. |
| 1522 | */ |
| 1523 | |
| 1524 | rcu_read_lock(); |
| 1525 | |
| 1526 | /* For all registered applications */ |
| 1527 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1528 | ua_sess = lookup_session_by_app(usess, app); |
| 1529 | /* If ua_sess is NULL, there is a code flow error */ |
| 1530 | assert(ua_sess); |
| 1531 | |
| 1532 | /* Lookup channel in the ust app session */ |
| 1533 | ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name, |
| 1534 | strlen(uchan->name), &uiter); |
| 1535 | /* If the channel is not found, there is a code flow error */ |
| 1536 | assert(ua_chan_node); |
| 1537 | |
| 1538 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
| 1539 | |
| 1540 | ua_event_node = hashtable_lookup(ua_sess->channels, |
| 1541 | (void*)uevent->attr.name, strlen(uevent->attr.name), &uiter); |
| 1542 | if (ua_event_node == NULL) { |
| 1543 | DBG3("UST app enable event %s not found. Skipping app", |
| 1544 | uevent->attr.name); |
| 1545 | continue; |
| 1546 | } |
| 1547 | ua_event = caa_container_of(ua_event_node, struct ust_app_event, node); |
| 1548 | |
| 1549 | ret = enable_ust_app_event(ua_sess, ua_event, app); |
| 1550 | if (ret < 0) { |
| 1551 | /* XXX: Report error someday... */ |
| 1552 | continue; |
| 1553 | } |
| 1554 | } |
| 1555 | |
| 1556 | rcu_read_unlock(); |
| 1557 | |
| 1558 | return ret; |
| 1559 | } |
| 1560 | |
| 1561 | /* |
| 1562 | * For a specific existing UST session and UST channel, creates the event for |
| 1563 | * all registered apps. |
| 1564 | */ |
| 1565 | int ust_app_create_event_glb(struct ltt_ust_session *usess, |
| 1566 | struct ltt_ust_channel *uchan, struct ltt_ust_event *uevent) |
| 1567 | { |
| 1568 | int ret = 0; |
| 1569 | struct cds_lfht_iter iter, uiter; |
| 1570 | struct cds_lfht_node *ua_chan_node; |
| 1571 | struct ust_app *app; |
| 1572 | struct ust_app_session *ua_sess; |
| 1573 | struct ust_app_channel *ua_chan; |
| 1574 | |
| 1575 | DBG("UST app creating event %s for all apps for session uid %d", |
| 1576 | uevent->attr.name, usess->uid); |
| 1577 | |
| 1578 | /* |
| 1579 | * NOTE: At this point, this function is called only if the session and |
| 1580 | * channel passed are already created for all apps. and enabled on the |
| 1581 | * tracer also. |
| 1582 | */ |
| 1583 | |
| 1584 | rcu_read_lock(); |
| 1585 | |
| 1586 | /* For all registered applications */ |
| 1587 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1588 | ua_sess = lookup_session_by_app(usess, app); |
| 1589 | /* If ua_sess is NULL, there is a code flow error */ |
| 1590 | assert(ua_sess); |
| 1591 | |
| 1592 | /* Lookup channel in the ust app session */ |
| 1593 | ua_chan_node = hashtable_lookup(ua_sess->channels, (void *)uchan->name, |
| 1594 | strlen(uchan->name), &uiter); |
| 1595 | /* If the channel is not found, there is a code flow error */ |
| 1596 | assert(ua_chan_node); |
| 1597 | |
| 1598 | ua_chan = caa_container_of(ua_chan_node, struct ust_app_channel, node); |
| 1599 | |
| 1600 | ret = create_ust_app_event(ua_sess, ua_chan, uevent, app); |
| 1601 | if (ret < 0) { |
| 1602 | continue; |
| 1603 | } |
| 1604 | } |
| 1605 | |
| 1606 | rcu_read_unlock(); |
| 1607 | |
| 1608 | return ret; |
| 1609 | } |
| 1610 | |
| 1611 | /* |
| 1612 | * Start tracing for a specific UST session and app. |
| 1613 | */ |
| 1614 | int ust_app_start_trace(struct ltt_ust_session *usess, struct ust_app *app) |
| 1615 | { |
| 1616 | int ret = 0; |
| 1617 | struct cds_lfht_iter iter; |
| 1618 | struct ust_app_session *ua_sess; |
| 1619 | struct ust_app_channel *ua_chan; |
| 1620 | struct ltt_ust_stream *ustream; |
| 1621 | int consumerd_fd; |
| 1622 | |
| 1623 | DBG("Starting tracing for ust app pid %d", app->key.pid); |
| 1624 | |
| 1625 | rcu_read_lock(); |
| 1626 | |
| 1627 | ua_sess = lookup_session_by_app(usess, app); |
| 1628 | if (ua_sess == NULL) { |
| 1629 | goto error_rcu_unlock; |
| 1630 | } |
| 1631 | |
| 1632 | /* Upon restart, we skip the setup, already done */ |
| 1633 | if (ua_sess->started) { |
| 1634 | goto skip_setup; |
| 1635 | } |
| 1636 | |
| 1637 | ret = create_ust_app_metadata(ua_sess, usess->pathname, app); |
| 1638 | if (ret < 0) { |
| 1639 | goto error_rcu_unlock; |
| 1640 | } |
| 1641 | |
| 1642 | /* For each channel */ |
| 1643 | cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) { |
| 1644 | /* Create all streams */ |
| 1645 | while (1) { |
| 1646 | /* Create UST stream */ |
| 1647 | ustream = zmalloc(sizeof(*ustream)); |
| 1648 | if (ustream == NULL) { |
| 1649 | PERROR("zmalloc ust stream"); |
| 1650 | goto error_rcu_unlock; |
| 1651 | } |
| 1652 | |
| 1653 | ret = ustctl_create_stream(app->key.sock, ua_chan->obj, |
| 1654 | &ustream->obj); |
| 1655 | if (ret < 0) { |
| 1656 | /* Got all streams */ |
| 1657 | break; |
| 1658 | } |
| 1659 | ustream->handle = ustream->obj->handle; |
| 1660 | |
| 1661 | /* Order is important */ |
| 1662 | cds_list_add_tail(&ustream->list, &ua_chan->streams.head); |
| 1663 | ret = snprintf(ustream->pathname, PATH_MAX, "%s/%s_%u", |
| 1664 | ua_sess->path, ua_chan->name, |
| 1665 | ua_chan->streams.count++); |
| 1666 | if (ret < 0) { |
| 1667 | PERROR("asprintf UST create stream"); |
| 1668 | continue; |
| 1669 | } |
| 1670 | DBG2("UST stream %d ready at %s", ua_chan->streams.count, |
| 1671 | ustream->pathname); |
| 1672 | } |
| 1673 | } |
| 1674 | |
| 1675 | switch (app->bits_per_long) { |
| 1676 | case 64: |
| 1677 | consumerd_fd = ust_consumerd64_fd; |
| 1678 | break; |
| 1679 | case 32: |
| 1680 | consumerd_fd = ust_consumerd32_fd; |
| 1681 | break; |
| 1682 | default: |
| 1683 | ret = -EINVAL; |
| 1684 | goto error_rcu_unlock; |
| 1685 | } |
| 1686 | |
| 1687 | /* Setup UST consumer socket and send fds to it */ |
| 1688 | ret = ust_consumer_send_session(consumerd_fd, ua_sess); |
| 1689 | if (ret < 0) { |
| 1690 | goto error_rcu_unlock; |
| 1691 | } |
| 1692 | ua_sess->started = 1; |
| 1693 | |
| 1694 | skip_setup: |
| 1695 | /* This start the UST tracing */ |
| 1696 | ret = ustctl_start_session(app->key.sock, ua_sess->handle); |
| 1697 | if (ret < 0) { |
| 1698 | ERR("Error starting tracing for app pid: %d", app->key.pid); |
| 1699 | goto error_rcu_unlock; |
| 1700 | } |
| 1701 | |
| 1702 | rcu_read_unlock(); |
| 1703 | |
| 1704 | /* Quiescent wait after starting trace */ |
| 1705 | ustctl_wait_quiescent(app->key.sock); |
| 1706 | |
| 1707 | return 0; |
| 1708 | |
| 1709 | error_rcu_unlock: |
| 1710 | rcu_read_unlock(); |
| 1711 | return -1; |
| 1712 | } |
| 1713 | |
| 1714 | /* |
| 1715 | * Stop tracing for a specific UST session and app. |
| 1716 | */ |
| 1717 | int ust_app_stop_trace(struct ltt_ust_session *usess, struct ust_app *app) |
| 1718 | { |
| 1719 | int ret = 0; |
| 1720 | struct ust_app_session *ua_sess; |
| 1721 | |
| 1722 | DBG("Stopping tracing for ust app pid %d", app->key.pid); |
| 1723 | |
| 1724 | rcu_read_lock(); |
| 1725 | |
| 1726 | ua_sess = lookup_session_by_app(usess, app); |
| 1727 | if (ua_sess == NULL) { |
| 1728 | /* Only malloc can failed so something is really wrong */ |
| 1729 | goto error_rcu_unlock; |
| 1730 | } |
| 1731 | |
| 1732 | #if 0 /* only useful when periodical flush will be supported */ |
| 1733 | /* need to keep a handle on shm in session for this. */ |
| 1734 | /* Flush all buffers before stopping */ |
| 1735 | ret = ustctl_flush_buffer(usess->sock, usess->metadata->obj); |
| 1736 | if (ret < 0) { |
| 1737 | ERR("UST metadata flush failed"); |
| 1738 | } |
| 1739 | |
| 1740 | cds_list_for_each_entry(ustchan, &usess->channels.head, list) { |
| 1741 | ret = ustctl_flush_buffer(usess->sock, ustchan->obj); |
| 1742 | if (ret < 0) { |
| 1743 | ERR("UST flush buffer error"); |
| 1744 | } |
| 1745 | } |
| 1746 | #endif |
| 1747 | |
| 1748 | /* This inhibits UST tracing */ |
| 1749 | ret = ustctl_stop_session(app->key.sock, ua_sess->handle); |
| 1750 | if (ret < 0) { |
| 1751 | ERR("Error stopping tracing for app pid: %d", app->key.pid); |
| 1752 | goto error_rcu_unlock; |
| 1753 | } |
| 1754 | |
| 1755 | rcu_read_unlock(); |
| 1756 | |
| 1757 | /* Quiescent wait after stopping trace */ |
| 1758 | ustctl_wait_quiescent(app->key.sock); |
| 1759 | |
| 1760 | return 0; |
| 1761 | |
| 1762 | error_rcu_unlock: |
| 1763 | rcu_read_unlock(); |
| 1764 | return -1; |
| 1765 | } |
| 1766 | |
| 1767 | /* |
| 1768 | * Destroy a specific UST session in apps. |
| 1769 | */ |
| 1770 | int ust_app_destroy_trace(struct ltt_ust_session *usess, struct ust_app *app) |
| 1771 | { |
| 1772 | struct ust_app_session *ua_sess; |
| 1773 | struct lttng_ust_object_data obj; |
| 1774 | struct cds_lfht_iter iter; |
| 1775 | struct cds_lfht_node *node; |
| 1776 | int ret; |
| 1777 | |
| 1778 | DBG("Destroy tracing for ust app pid %d", app->key.pid); |
| 1779 | |
| 1780 | rcu_read_lock(); |
| 1781 | |
| 1782 | __lookup_session_by_app(usess, app, &iter); |
| 1783 | node = hashtable_iter_get_node(&iter); |
| 1784 | if (node == NULL) { |
| 1785 | /* Only malloc can failed so something is really wrong */ |
| 1786 | goto error_rcu_unlock; |
| 1787 | } |
| 1788 | ua_sess = caa_container_of(node, struct ust_app_session, node); |
| 1789 | ret = hashtable_del(app->sessions, &iter); |
| 1790 | assert(!ret); |
| 1791 | delete_ust_app_session(app->key.sock, ua_sess); |
| 1792 | obj.handle = ua_sess->handle; |
| 1793 | obj.shm_fd = -1; |
| 1794 | obj.wait_fd = -1; |
| 1795 | obj.memory_map_size = 0; |
| 1796 | ustctl_release_object(app->key.sock, &obj); |
| 1797 | |
| 1798 | rcu_read_unlock(); |
| 1799 | |
| 1800 | /* Quiescent wait after stopping trace */ |
| 1801 | ustctl_wait_quiescent(app->key.sock); |
| 1802 | |
| 1803 | return 0; |
| 1804 | |
| 1805 | error_rcu_unlock: |
| 1806 | rcu_read_unlock(); |
| 1807 | return -1; |
| 1808 | } |
| 1809 | |
| 1810 | /* |
| 1811 | * Start tracing for the UST session. |
| 1812 | */ |
| 1813 | int ust_app_start_trace_all(struct ltt_ust_session *usess) |
| 1814 | { |
| 1815 | int ret = 0; |
| 1816 | struct cds_lfht_iter iter; |
| 1817 | struct ust_app *app; |
| 1818 | |
| 1819 | DBG("Starting all UST traces"); |
| 1820 | |
| 1821 | rcu_read_lock(); |
| 1822 | |
| 1823 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1824 | ret = ust_app_start_trace(usess, app); |
| 1825 | if (ret < 0) { |
| 1826 | /* Continue to next apps even on error */ |
| 1827 | continue; |
| 1828 | } |
| 1829 | } |
| 1830 | |
| 1831 | rcu_read_unlock(); |
| 1832 | |
| 1833 | return 0; |
| 1834 | } |
| 1835 | |
| 1836 | /* |
| 1837 | * Start tracing for the UST session. |
| 1838 | */ |
| 1839 | int ust_app_stop_trace_all(struct ltt_ust_session *usess) |
| 1840 | { |
| 1841 | int ret = 0; |
| 1842 | struct cds_lfht_iter iter; |
| 1843 | struct ust_app *app; |
| 1844 | |
| 1845 | DBG("Stopping all UST traces"); |
| 1846 | |
| 1847 | rcu_read_lock(); |
| 1848 | |
| 1849 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1850 | ret = ust_app_stop_trace(usess, app); |
| 1851 | if (ret < 0) { |
| 1852 | /* Continue to next apps even on error */ |
| 1853 | continue; |
| 1854 | } |
| 1855 | } |
| 1856 | |
| 1857 | rcu_read_unlock(); |
| 1858 | |
| 1859 | return 0; |
| 1860 | } |
| 1861 | |
| 1862 | /* |
| 1863 | * Destroy app UST session. |
| 1864 | */ |
| 1865 | int ust_app_destroy_trace_all(struct ltt_ust_session *usess) |
| 1866 | { |
| 1867 | int ret = 0; |
| 1868 | struct cds_lfht_iter iter; |
| 1869 | struct ust_app *app; |
| 1870 | |
| 1871 | DBG("Destroy all UST traces"); |
| 1872 | |
| 1873 | rcu_read_lock(); |
| 1874 | |
| 1875 | cds_lfht_for_each_entry(ust_app_ht, &iter, app, node) { |
| 1876 | ret = ust_app_destroy_trace(usess, app); |
| 1877 | if (ret < 0) { |
| 1878 | /* Continue to next apps even on error */ |
| 1879 | continue; |
| 1880 | } |
| 1881 | } |
| 1882 | |
| 1883 | rcu_read_unlock(); |
| 1884 | |
| 1885 | return 0; |
| 1886 | } |
| 1887 | |
| 1888 | /* |
| 1889 | * Add channels/events from UST global domain to registered apps at sock. |
| 1890 | */ |
| 1891 | void ust_app_global_update(struct ltt_ust_session *usess, int sock) |
| 1892 | { |
| 1893 | int ret = 0; |
| 1894 | struct cds_lfht_iter iter; |
| 1895 | struct ust_app *app; |
| 1896 | struct ust_app_session *ua_sess; |
| 1897 | struct ust_app_channel *ua_chan; |
| 1898 | struct ust_app_event *ua_event; |
| 1899 | |
| 1900 | if (usess == NULL) { |
| 1901 | ERR("No UST session on global update. Returning"); |
| 1902 | goto error; |
| 1903 | } |
| 1904 | |
| 1905 | DBG2("UST app global update for app sock %d for session uid %d", sock, |
| 1906 | usess->uid); |
| 1907 | |
| 1908 | rcu_read_lock(); |
| 1909 | |
| 1910 | app = find_app_by_sock(sock); |
| 1911 | if (app == NULL) { |
| 1912 | ERR("Failed to update app sock %d", sock); |
| 1913 | goto error; |
| 1914 | } |
| 1915 | |
| 1916 | ua_sess = create_ust_app_session(usess, app); |
| 1917 | if (ua_sess == NULL) { |
| 1918 | goto error; |
| 1919 | } |
| 1920 | |
| 1921 | /* |
| 1922 | * We can iterate safely here over all UST app session sicne the create ust |
| 1923 | * app session above made a shadow copy of the UST global domain from the |
| 1924 | * ltt ust session. |
| 1925 | */ |
| 1926 | cds_lfht_for_each_entry(ua_sess->channels, &iter, ua_chan, node) { |
| 1927 | ret = create_ust_channel(app, ua_sess, ua_chan); |
| 1928 | if (ret < 0) { |
| 1929 | /* FIXME: Should we quit here or continue... */ |
| 1930 | continue; |
| 1931 | } |
| 1932 | |
| 1933 | /* For each events */ |
| 1934 | cds_lfht_for_each_entry(ua_chan->events, &iter, ua_event, node) { |
| 1935 | ret = create_ust_event(app, ua_sess, ua_chan, ua_event); |
| 1936 | if (ret < 0) { |
| 1937 | /* FIXME: Should we quit here or continue... */ |
| 1938 | continue; |
| 1939 | } |
| 1940 | } |
| 1941 | } |
| 1942 | |
| 1943 | if (usess->start_trace) { |
| 1944 | ret = ust_app_start_trace(usess, app); |
| 1945 | if (ret < 0) { |
| 1946 | goto error; |
| 1947 | } |
| 1948 | |
| 1949 | DBG2("UST trace started for app pid %d", app->key.pid); |
| 1950 | } |
| 1951 | |
| 1952 | error: |
| 1953 | rcu_read_unlock(); |
| 1954 | return; |
| 1955 | } |