| 1 | /* |
| 2 | * Copyright (C) 2013 - David Goulet <dgoulet@efficios.com> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify it |
| 5 | * under the terms of the GNU General Public License, version 2 only, as |
| 6 | * published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 9 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 10 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 11 | * more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along with |
| 14 | * this program; if not, write to the Free Software Foundation, Inc., 51 |
| 15 | * Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _GNU_SOURCE |
| 19 | #include <assert.h> |
| 20 | #include <urcu/uatomic.h> |
| 21 | |
| 22 | #include <common/common.h> |
| 23 | #include <common/sessiond-comm/jul.h> |
| 24 | |
| 25 | #include "jul.h" |
| 26 | #include "ust-app.h" |
| 27 | #include "utils.h" |
| 28 | |
| 29 | /* |
| 30 | * URCU intermediate call to complete destroy a JUL event. |
| 31 | */ |
| 32 | static void destroy_event_jul_rcu(struct rcu_head *head) |
| 33 | { |
| 34 | struct lttng_ht_node_str *node = |
| 35 | caa_container_of(head, struct lttng_ht_node_str, head); |
| 36 | struct jul_event *event = |
| 37 | caa_container_of(node, struct jul_event, node); |
| 38 | |
| 39 | free(event); |
| 40 | } |
| 41 | |
| 42 | /* |
| 43 | * URCU intermediate call to complete destroy a JUL event. |
| 44 | */ |
| 45 | static void destroy_app_jul_rcu(struct rcu_head *head) |
| 46 | { |
| 47 | struct lttng_ht_node_ulong *node = |
| 48 | caa_container_of(head, struct lttng_ht_node_ulong, head); |
| 49 | struct jul_app *app = |
| 50 | caa_container_of(node, struct jul_app, node); |
| 51 | |
| 52 | free(app); |
| 53 | } |
| 54 | |
| 55 | /* |
| 56 | * Communication with Java agent call. Send the message header to the given |
| 57 | * socket all in big endian. |
| 58 | * |
| 59 | * Return 0 on success or else a negative errno message of sendmsg() op. |
| 60 | */ |
| 61 | static int send_header(struct lttcomm_sock *sock, uint64_t data_size, |
| 62 | uint32_t cmd, uint32_t cmd_version) |
| 63 | { |
| 64 | int ret; |
| 65 | ssize_t size; |
| 66 | struct lttcomm_jul_hdr msg; |
| 67 | |
| 68 | assert(sock); |
| 69 | |
| 70 | msg.data_size = htobe64(data_size); |
| 71 | msg.cmd = htobe32(cmd); |
| 72 | msg.cmd_version = htobe32(cmd_version); |
| 73 | |
| 74 | size = sock->ops->sendmsg(sock, &msg, sizeof(msg), 0); |
| 75 | if (size < sizeof(msg)) { |
| 76 | ret = -errno; |
| 77 | goto error; |
| 78 | } |
| 79 | ret = 0; |
| 80 | |
| 81 | error: |
| 82 | return ret; |
| 83 | } |
| 84 | |
| 85 | /* |
| 86 | * Communication call with the Java agent. Send the payload to the given |
| 87 | * socket. The header MUST be sent prior to this call. |
| 88 | * |
| 89 | * Return 0 on success or else a negative errno value of sendmsg() op. |
| 90 | */ |
| 91 | static int send_payload(struct lttcomm_sock *sock, void *data, |
| 92 | size_t size) |
| 93 | { |
| 94 | int ret; |
| 95 | ssize_t len; |
| 96 | |
| 97 | assert(sock); |
| 98 | assert(data); |
| 99 | |
| 100 | len = sock->ops->sendmsg(sock, data, size, 0); |
| 101 | if (len < size) { |
| 102 | ret = -errno; |
| 103 | goto error; |
| 104 | } |
| 105 | ret = 0; |
| 106 | |
| 107 | error: |
| 108 | return ret; |
| 109 | } |
| 110 | |
| 111 | /* |
| 112 | * Communication call with the Java agent. Receive reply from the agent using |
| 113 | * the given socket. |
| 114 | * |
| 115 | * Return 0 on success or else a negative errno value from recvmsg() op. |
| 116 | */ |
| 117 | static int recv_reply(struct lttcomm_sock *sock, void *buf, size_t size) |
| 118 | { |
| 119 | int ret; |
| 120 | ssize_t len; |
| 121 | |
| 122 | assert(sock); |
| 123 | assert(buf); |
| 124 | |
| 125 | len = sock->ops->recvmsg(sock, buf, size, 0); |
| 126 | if (len < size) { |
| 127 | ret = -errno; |
| 128 | goto error; |
| 129 | } |
| 130 | ret = 0; |
| 131 | |
| 132 | error: |
| 133 | return ret; |
| 134 | } |
| 135 | |
| 136 | |
| 137 | /* |
| 138 | * Internal call to list events on a given app. Populate events. |
| 139 | * |
| 140 | * Return number of element in the list or else a negative LTTNG_ERR* code. |
| 141 | */ |
| 142 | static ssize_t list_events(struct jul_app *app, struct lttng_event **events) |
| 143 | { |
| 144 | int ret, i, len = 0, offset = 0; |
| 145 | uint32_t nb_event; |
| 146 | size_t data_size; |
| 147 | struct lttng_event *tmp_events = NULL; |
| 148 | struct lttcomm_jul_list_reply *reply = NULL; |
| 149 | struct lttcomm_jul_list_reply_hdr reply_hdr; |
| 150 | |
| 151 | assert(app); |
| 152 | assert(app->sock); |
| 153 | assert(events); |
| 154 | |
| 155 | DBG2("JUL listing events for app pid: %d and socket %d", app->pid, |
| 156 | app->sock->fd); |
| 157 | |
| 158 | ret = send_header(app->sock, 0, JUL_CMD_LIST, 0); |
| 159 | if (ret < 0) { |
| 160 | goto error_io; |
| 161 | } |
| 162 | |
| 163 | /* Get list header so we know how much we'll receive. */ |
| 164 | ret = recv_reply(app->sock, &reply_hdr, sizeof(reply_hdr)); |
| 165 | if (ret < 0) { |
| 166 | goto error_io; |
| 167 | } |
| 168 | |
| 169 | switch (be32toh(reply_hdr.ret_code)) { |
| 170 | case JUL_RET_CODE_SUCCESS: |
| 171 | data_size = be32toh(reply_hdr.data_size) + sizeof(*reply); |
| 172 | break; |
| 173 | default: |
| 174 | ERR("Java agent returned an unknown code: %" PRIu32, |
| 175 | be32toh(reply_hdr.ret_code)); |
| 176 | ret = LTTNG_ERR_FATAL; |
| 177 | goto error; |
| 178 | } |
| 179 | |
| 180 | reply = zmalloc(data_size); |
| 181 | if (!reply) { |
| 182 | ret = LTTNG_ERR_NOMEM; |
| 183 | goto error; |
| 184 | } |
| 185 | |
| 186 | /* Get the list with the appropriate data size. */ |
| 187 | ret = recv_reply(app->sock, reply, data_size); |
| 188 | if (ret < 0) { |
| 189 | goto error_io; |
| 190 | } |
| 191 | |
| 192 | nb_event = be32toh(reply->nb_event); |
| 193 | tmp_events = zmalloc(sizeof(*tmp_events) * nb_event); |
| 194 | if (!tmp_events) { |
| 195 | ret = LTTNG_ERR_NOMEM; |
| 196 | goto error; |
| 197 | } |
| 198 | |
| 199 | for (i = 0; i < nb_event; i++) { |
| 200 | offset += len; |
| 201 | strncpy(tmp_events[i].name, reply->payload + offset, |
| 202 | sizeof(tmp_events[i].name)); |
| 203 | tmp_events[i].pid = app->pid; |
| 204 | tmp_events[i].enabled = -1; |
| 205 | len = strlen(reply->payload + offset) + 1; |
| 206 | } |
| 207 | |
| 208 | *events = tmp_events; |
| 209 | |
| 210 | free(reply); |
| 211 | return nb_event; |
| 212 | |
| 213 | error_io: |
| 214 | ret = LTTNG_ERR_UST_LIST_FAIL; |
| 215 | error: |
| 216 | free(reply); |
| 217 | free(tmp_events); |
| 218 | return -ret; |
| 219 | |
| 220 | } |
| 221 | |
| 222 | /* |
| 223 | * Internal enable JUL event call on a JUL application. This function |
| 224 | * communicates with the Java agent to enable a given event (Logger name). |
| 225 | * |
| 226 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 227 | */ |
| 228 | static int enable_event(struct jul_app *app, struct jul_event *event) |
| 229 | { |
| 230 | int ret; |
| 231 | uint64_t data_size; |
| 232 | struct lttcomm_jul_enable msg; |
| 233 | struct lttcomm_jul_generic_reply reply; |
| 234 | |
| 235 | assert(app); |
| 236 | assert(app->sock); |
| 237 | assert(event); |
| 238 | |
| 239 | DBG2("JUL enabling event %s for app pid: %d and socket %d", event->name, |
| 240 | app->pid, app->sock->fd); |
| 241 | |
| 242 | data_size = sizeof(msg); |
| 243 | |
| 244 | ret = send_header(app->sock, data_size, JUL_CMD_ENABLE, 0); |
| 245 | if (ret < 0) { |
| 246 | goto error_io; |
| 247 | } |
| 248 | |
| 249 | strncpy(msg.name, event->name, sizeof(msg.name)); |
| 250 | ret = send_payload(app->sock, &msg, sizeof(msg)); |
| 251 | if (ret < 0) { |
| 252 | goto error_io; |
| 253 | } |
| 254 | |
| 255 | ret = recv_reply(app->sock, &reply, sizeof(reply)); |
| 256 | if (ret < 0) { |
| 257 | goto error_io; |
| 258 | } |
| 259 | |
| 260 | switch (be32toh(reply.ret_code)) { |
| 261 | case JUL_RET_CODE_SUCCESS: |
| 262 | break; |
| 263 | case JUL_RET_CODE_UNKNOWN_NAME: |
| 264 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 265 | goto error; |
| 266 | default: |
| 267 | ERR("Java agent returned an unknown code: %" PRIu32, |
| 268 | be32toh(reply.ret_code)); |
| 269 | ret = LTTNG_ERR_FATAL; |
| 270 | goto error; |
| 271 | } |
| 272 | |
| 273 | return LTTNG_OK; |
| 274 | |
| 275 | error_io: |
| 276 | ret = LTTNG_ERR_UST_ENABLE_FAIL; |
| 277 | error: |
| 278 | return ret; |
| 279 | } |
| 280 | |
| 281 | /* |
| 282 | * Internal disable JUL event call on a JUL application. This function |
| 283 | * communicates with the Java agent to disable a given event (Logger name). |
| 284 | * |
| 285 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 286 | */ |
| 287 | static int disable_event(struct jul_app *app, struct jul_event *event) |
| 288 | { |
| 289 | int ret; |
| 290 | uint64_t data_size; |
| 291 | struct lttcomm_jul_disable msg; |
| 292 | struct lttcomm_jul_generic_reply reply; |
| 293 | |
| 294 | assert(app); |
| 295 | assert(app->sock); |
| 296 | assert(event); |
| 297 | |
| 298 | DBG2("JUL disabling event %s for app pid: %d and socket %d", event->name, |
| 299 | app->pid, app->sock->fd); |
| 300 | |
| 301 | data_size = sizeof(msg); |
| 302 | |
| 303 | ret = send_header(app->sock, data_size, JUL_CMD_DISABLE, 0); |
| 304 | if (ret < 0) { |
| 305 | goto error_io; |
| 306 | } |
| 307 | |
| 308 | strncpy(msg.name, event->name, sizeof(msg.name)); |
| 309 | ret = send_payload(app->sock, &msg, sizeof(msg)); |
| 310 | if (ret < 0) { |
| 311 | goto error_io; |
| 312 | } |
| 313 | |
| 314 | ret = recv_reply(app->sock, &reply, sizeof(reply)); |
| 315 | if (ret < 0) { |
| 316 | goto error_io; |
| 317 | } |
| 318 | |
| 319 | switch (be32toh(reply.ret_code)) { |
| 320 | case JUL_RET_CODE_SUCCESS: |
| 321 | break; |
| 322 | case JUL_RET_CODE_UNKNOWN_NAME: |
| 323 | ret = LTTNG_ERR_UST_EVENT_NOT_FOUND; |
| 324 | goto error; |
| 325 | default: |
| 326 | ERR("Java agent returned an unknown code: %" PRIu32, |
| 327 | be32toh(reply.ret_code)); |
| 328 | ret = LTTNG_ERR_FATAL; |
| 329 | goto error; |
| 330 | } |
| 331 | |
| 332 | return LTTNG_OK; |
| 333 | |
| 334 | error_io: |
| 335 | ret = LTTNG_ERR_UST_DISABLE_FAIL; |
| 336 | error: |
| 337 | return ret; |
| 338 | } |
| 339 | |
| 340 | /* |
| 341 | * Enable JUL event on every JUL applications registered with the session |
| 342 | * daemon. |
| 343 | * |
| 344 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 345 | */ |
| 346 | int jul_enable_event(struct jul_event *event) |
| 347 | { |
| 348 | int ret; |
| 349 | struct jul_app *app; |
| 350 | struct lttng_ht_iter iter; |
| 351 | |
| 352 | assert(event); |
| 353 | |
| 354 | rcu_read_lock(); |
| 355 | |
| 356 | cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, app, |
| 357 | node.node) { |
| 358 | /* Enable event on JUL application through TCP socket. */ |
| 359 | ret = enable_event(app, event); |
| 360 | if (ret != LTTNG_OK) { |
| 361 | goto error; |
| 362 | } |
| 363 | } |
| 364 | |
| 365 | event->enabled = 1; |
| 366 | ret = LTTNG_OK; |
| 367 | |
| 368 | error: |
| 369 | rcu_read_unlock(); |
| 370 | return ret; |
| 371 | } |
| 372 | |
| 373 | /* |
| 374 | * Disable JUL event on every JUL applications registered with the session |
| 375 | * daemon. |
| 376 | * |
| 377 | * Return LTTNG_OK on success or else a LTTNG_ERR* code. |
| 378 | */ |
| 379 | int jul_disable_event(struct jul_event *event) |
| 380 | { |
| 381 | int ret; |
| 382 | struct jul_app *app; |
| 383 | struct lttng_ht_iter iter; |
| 384 | |
| 385 | assert(event); |
| 386 | |
| 387 | rcu_read_lock(); |
| 388 | |
| 389 | cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, app, |
| 390 | node.node) { |
| 391 | /* Enable event on JUL application through TCP socket. */ |
| 392 | ret = disable_event(app, event); |
| 393 | if (ret != LTTNG_OK) { |
| 394 | goto error; |
| 395 | } |
| 396 | } |
| 397 | |
| 398 | event->enabled = 0; |
| 399 | ret = LTTNG_OK; |
| 400 | |
| 401 | error: |
| 402 | rcu_read_unlock(); |
| 403 | return ret; |
| 404 | } |
| 405 | |
| 406 | /* |
| 407 | * Ask every java agent for the list of possible event (logger name). Events is |
| 408 | * allocated with the events of every JUL application. |
| 409 | * |
| 410 | * Return the number of events or else a negative value. |
| 411 | */ |
| 412 | int jul_list_events(struct lttng_event **events) |
| 413 | { |
| 414 | int ret; |
| 415 | size_t nbmem, count = 0; |
| 416 | struct jul_app *app; |
| 417 | struct lttng_event *tmp_events = NULL; |
| 418 | struct lttng_ht_iter iter; |
| 419 | |
| 420 | assert(events); |
| 421 | |
| 422 | nbmem = UST_APP_EVENT_LIST_SIZE; |
| 423 | tmp_events = zmalloc(nbmem * sizeof(*tmp_events)); |
| 424 | if (!tmp_events) { |
| 425 | PERROR("zmalloc jul list events"); |
| 426 | ret = -ENOMEM; |
| 427 | goto error; |
| 428 | } |
| 429 | |
| 430 | rcu_read_lock(); |
| 431 | cds_lfht_for_each_entry(jul_apps_ht_by_sock->ht, &iter.iter, app, |
| 432 | node.node) { |
| 433 | ssize_t nb_ev; |
| 434 | struct lttng_event *jul_events; |
| 435 | |
| 436 | nb_ev = list_events(app, &jul_events); |
| 437 | if (nb_ev < 0) { |
| 438 | ret = nb_ev; |
| 439 | rcu_read_unlock(); |
| 440 | goto error; |
| 441 | } |
| 442 | |
| 443 | if (count >= nbmem) { |
| 444 | /* In case the realloc fails, we free the memory */ |
| 445 | void *ptr; |
| 446 | |
| 447 | DBG2("Reallocating JUL event list from %zu to %zu entries", nbmem, |
| 448 | 2 * nbmem); |
| 449 | nbmem *= 2; |
| 450 | ptr = realloc(tmp_events, nbmem * sizeof(*tmp_events)); |
| 451 | if (!ptr) { |
| 452 | PERROR("realloc JUL events"); |
| 453 | ret = -ENOMEM; |
| 454 | rcu_read_unlock(); |
| 455 | goto error; |
| 456 | } |
| 457 | tmp_events = ptr; |
| 458 | } |
| 459 | memcpy(tmp_events + (count * sizeof(*tmp_events)), jul_events, |
| 460 | nb_ev * sizeof(*tmp_events)); |
| 461 | free(jul_events); |
| 462 | count += nb_ev; |
| 463 | } |
| 464 | rcu_read_unlock(); |
| 465 | |
| 466 | ret = count; |
| 467 | *events = tmp_events; |
| 468 | return ret; |
| 469 | |
| 470 | error: |
| 471 | free(tmp_events); |
| 472 | return ret; |
| 473 | } |
| 474 | |
| 475 | /* |
| 476 | * Create a JUL app object using the given PID. |
| 477 | * |
| 478 | * Return newly allocated object or else NULL on error. |
| 479 | */ |
| 480 | struct jul_app *jul_create_app(pid_t pid, struct lttcomm_sock *sock) |
| 481 | { |
| 482 | struct jul_app *app; |
| 483 | |
| 484 | assert(sock); |
| 485 | |
| 486 | app = zmalloc(sizeof(*app)); |
| 487 | if (!app) { |
| 488 | PERROR("zmalloc JUL create"); |
| 489 | goto error; |
| 490 | } |
| 491 | |
| 492 | app->pid = pid; |
| 493 | app->sock = sock; |
| 494 | /* Flag it invalid until assignation. */ |
| 495 | app->ust_app_sock = -1; |
| 496 | lttng_ht_node_init_ulong(&app->node, (unsigned long) app->sock->fd); |
| 497 | |
| 498 | error: |
| 499 | return app; |
| 500 | } |
| 501 | |
| 502 | /* |
| 503 | * Lookup JUL app by socket in the global hash table. |
| 504 | * |
| 505 | * RCU read side lock MUST be acquired. |
| 506 | * |
| 507 | * Return object if found else NULL. |
| 508 | */ |
| 509 | struct jul_app *jul_find_app_by_sock(int sock) |
| 510 | { |
| 511 | struct lttng_ht_node_ulong *node; |
| 512 | struct lttng_ht_iter iter; |
| 513 | struct jul_app *app; |
| 514 | |
| 515 | assert(sock >= 0); |
| 516 | |
| 517 | lttng_ht_lookup(jul_apps_ht_by_sock, (void *)((unsigned long) sock), &iter); |
| 518 | node = lttng_ht_iter_get_node_ulong(&iter); |
| 519 | if (node == NULL) { |
| 520 | goto error; |
| 521 | } |
| 522 | app = caa_container_of(node, struct jul_app, node); |
| 523 | |
| 524 | DBG3("JUL app pid %d found by sock %d.", app->pid, sock); |
| 525 | return app; |
| 526 | |
| 527 | error: |
| 528 | DBG3("JUL app NOT found by sock %d.", sock); |
| 529 | return NULL; |
| 530 | } |
| 531 | |
| 532 | /* |
| 533 | * Add JUL application object to a given hash table. |
| 534 | */ |
| 535 | void jul_add_app(struct jul_app *app) |
| 536 | { |
| 537 | assert(app); |
| 538 | |
| 539 | DBG3("JUL adding app sock: %d and pid: %d to ht", app->sock->fd, app->pid); |
| 540 | |
| 541 | rcu_read_lock(); |
| 542 | lttng_ht_add_unique_ulong(jul_apps_ht_by_sock, &app->node); |
| 543 | rcu_read_unlock(); |
| 544 | } |
| 545 | |
| 546 | /* |
| 547 | * Attach a given JUL application to an UST app object. This is done by copying |
| 548 | * the socket fd value into the ust app obj. atomically. |
| 549 | */ |
| 550 | void jul_attach_app(struct jul_app *japp) |
| 551 | { |
| 552 | struct ust_app *uapp; |
| 553 | |
| 554 | assert(japp); |
| 555 | |
| 556 | rcu_read_lock(); |
| 557 | uapp = ust_app_find_by_pid(japp->pid); |
| 558 | if (!uapp) { |
| 559 | goto end; |
| 560 | } |
| 561 | |
| 562 | uatomic_set(&uapp->jul_app_sock, japp->sock->fd); |
| 563 | |
| 564 | DBG3("JUL app pid: %d, sock: %d attached to UST app.", japp->pid, |
| 565 | japp->sock->fd); |
| 566 | |
| 567 | end: |
| 568 | rcu_read_unlock(); |
| 569 | return; |
| 570 | } |
| 571 | |
| 572 | /* |
| 573 | * Remove JUL app. reference from an UST app object and set it to NULL. |
| 574 | */ |
| 575 | void jul_detach_app(struct jul_app *japp) |
| 576 | { |
| 577 | struct ust_app *uapp; |
| 578 | |
| 579 | assert(japp); |
| 580 | |
| 581 | rcu_read_lock(); |
| 582 | |
| 583 | if (japp->ust_app_sock < 0) { |
| 584 | goto end; |
| 585 | } |
| 586 | |
| 587 | uapp = ust_app_find_by_sock(japp->ust_app_sock); |
| 588 | if (!uapp) { |
| 589 | goto end; |
| 590 | } |
| 591 | |
| 592 | uapp->jul_app_sock = -1; |
| 593 | |
| 594 | end: |
| 595 | rcu_read_unlock(); |
| 596 | return; |
| 597 | } |
| 598 | |
| 599 | /* |
| 600 | * Delete JUL application from the global hash table. |
| 601 | */ |
| 602 | void jul_delete_app(struct jul_app *app) |
| 603 | { |
| 604 | int ret; |
| 605 | struct lttng_ht_iter iter; |
| 606 | |
| 607 | assert(app); |
| 608 | |
| 609 | DBG3("JUL deleting app pid: %d and sock: %d", app->pid, app->sock->fd); |
| 610 | |
| 611 | iter.iter.node = &app->node.node; |
| 612 | rcu_read_lock(); |
| 613 | ret = lttng_ht_del(jul_apps_ht_by_sock, &iter); |
| 614 | rcu_read_unlock(); |
| 615 | assert(!ret); |
| 616 | } |
| 617 | |
| 618 | /* |
| 619 | * Destroy a JUL application object by detaching it from its corresponding UST |
| 620 | * app if one, closing the socket and freeing the memory. |
| 621 | */ |
| 622 | void jul_destroy_app(struct jul_app *app) |
| 623 | { |
| 624 | assert(app); |
| 625 | |
| 626 | if (app->sock) { |
| 627 | app->sock->ops->close(app->sock); |
| 628 | lttcomm_destroy_sock(app->sock); |
| 629 | } |
| 630 | |
| 631 | call_rcu(&app->node.head, destroy_app_jul_rcu); |
| 632 | } |
| 633 | |
| 634 | /* |
| 635 | * Initialize an already allocated JUL domain object. |
| 636 | * |
| 637 | * Return 0 on success or else a negative errno value. |
| 638 | */ |
| 639 | int jul_init_domain(struct jul_domain *dom) |
| 640 | { |
| 641 | int ret; |
| 642 | |
| 643 | assert(dom); |
| 644 | |
| 645 | dom->events = lttng_ht_new(0, LTTNG_HT_TYPE_STRING); |
| 646 | if (!dom->events) { |
| 647 | ret = -ENOMEM; |
| 648 | goto error; |
| 649 | } |
| 650 | |
| 651 | return 0; |
| 652 | |
| 653 | error: |
| 654 | return ret; |
| 655 | } |
| 656 | |
| 657 | /* |
| 658 | * Create a newly allocated JUL event data structure. If name is valid, it's |
| 659 | * copied into the created event. |
| 660 | * |
| 661 | * Return a new object else NULL on error. |
| 662 | */ |
| 663 | struct jul_event *jul_create_event(const char *name) |
| 664 | { |
| 665 | struct jul_event *event; |
| 666 | |
| 667 | DBG3("JUL create new event with name %s", name); |
| 668 | |
| 669 | event = zmalloc(sizeof(*event)); |
| 670 | if (!event) { |
| 671 | goto error; |
| 672 | } |
| 673 | |
| 674 | if (name) { |
| 675 | strncpy(event->name, name, sizeof(event->name)); |
| 676 | event->name[sizeof(event->name) - 1] = '\0'; |
| 677 | lttng_ht_node_init_str(&event->node, event->name); |
| 678 | } |
| 679 | |
| 680 | error: |
| 681 | return event; |
| 682 | } |
| 683 | |
| 684 | /* |
| 685 | * Unique add of a JUL event to a given domain. |
| 686 | */ |
| 687 | void jul_add_event(struct jul_event *event, struct jul_domain *dom) |
| 688 | { |
| 689 | assert(event); |
| 690 | assert(dom); |
| 691 | assert(dom->events); |
| 692 | |
| 693 | DBG3("JUL adding event %s to domain", event->name); |
| 694 | |
| 695 | rcu_read_lock(); |
| 696 | lttng_ht_add_unique_str(dom->events, &event->node); |
| 697 | rcu_read_unlock(); |
| 698 | dom->being_used = 1; |
| 699 | } |
| 700 | |
| 701 | /* |
| 702 | * Find a JUL event in the given domain using name. |
| 703 | * |
| 704 | * RCU read side lock MUST be acquired. |
| 705 | * |
| 706 | * Return object if found else NULL. |
| 707 | */ |
| 708 | struct jul_event *jul_find_by_name(const char *name, struct jul_domain *dom) |
| 709 | { |
| 710 | struct lttng_ht_node_str *node; |
| 711 | struct lttng_ht_iter iter; |
| 712 | |
| 713 | assert(name); |
| 714 | assert(dom); |
| 715 | assert(dom->events); |
| 716 | |
| 717 | lttng_ht_lookup(dom->events, (void *)name, &iter); |
| 718 | node = lttng_ht_iter_get_node_str(&iter); |
| 719 | if (node == NULL) { |
| 720 | goto error; |
| 721 | } |
| 722 | |
| 723 | DBG3("JUL found by name %s in domain.", name); |
| 724 | return caa_container_of(node, struct jul_event, node); |
| 725 | |
| 726 | error: |
| 727 | DBG3("JUL NOT found by name %s in domain.", name); |
| 728 | return NULL; |
| 729 | } |
| 730 | |
| 731 | /* |
| 732 | * Delete JUL event from given domain. Events hash table MUST be initialized. |
| 733 | */ |
| 734 | void jul_delete_event(struct jul_event *event, struct jul_domain *dom) |
| 735 | { |
| 736 | int ret; |
| 737 | struct lttng_ht_iter iter; |
| 738 | |
| 739 | assert(event); |
| 740 | assert(dom); |
| 741 | assert(dom->events); |
| 742 | |
| 743 | DBG3("JUL deleting event %s from domain", event->name); |
| 744 | |
| 745 | iter.iter.node = &event->node.node; |
| 746 | rcu_read_lock(); |
| 747 | ret = lttng_ht_del(dom->events, &iter); |
| 748 | rcu_read_unlock(); |
| 749 | assert(!ret); |
| 750 | } |
| 751 | |
| 752 | /* |
| 753 | * Free given JUl event. After this call, the pointer is not usable anymore. |
| 754 | */ |
| 755 | void jul_destroy_event(struct jul_event *event) |
| 756 | { |
| 757 | assert(event); |
| 758 | |
| 759 | free(event); |
| 760 | } |
| 761 | |
| 762 | /* |
| 763 | * Destroy a JUL domain completely. Note that the given pointer is NOT freed |
| 764 | * thus a reference can be passed to this function. |
| 765 | */ |
| 766 | void jul_destroy_domain(struct jul_domain *dom) |
| 767 | { |
| 768 | struct lttng_ht_node_str *node; |
| 769 | struct lttng_ht_iter iter; |
| 770 | |
| 771 | assert(dom); |
| 772 | |
| 773 | DBG3("JUL destroy domain"); |
| 774 | |
| 775 | /* |
| 776 | * Just ignore if no events hash table exists. This is possible if for |
| 777 | * instance a JUL domain object was allocated but not initialized. |
| 778 | */ |
| 779 | if (!dom->events) { |
| 780 | return; |
| 781 | } |
| 782 | |
| 783 | rcu_read_lock(); |
| 784 | cds_lfht_for_each_entry(dom->events->ht, &iter.iter, node, node) { |
| 785 | int ret; |
| 786 | |
| 787 | ret = lttng_ht_del(dom->events, &iter); |
| 788 | assert(!ret); |
| 789 | call_rcu(&node->head, destroy_event_jul_rcu); |
| 790 | } |
| 791 | rcu_read_unlock(); |
| 792 | |
| 793 | lttng_ht_destroy(dom->events); |
| 794 | } |
| 795 | |
| 796 | /* |
| 797 | * Initialize JUL subsystem. |
| 798 | */ |
| 799 | int jul_init(void) |
| 800 | { |
| 801 | jul_apps_ht_by_sock = lttng_ht_new(0, LTTNG_HT_TYPE_ULONG); |
| 802 | if (!jul_apps_ht_by_sock) { |
| 803 | return -1; |
| 804 | } |
| 805 | |
| 806 | return 0; |
| 807 | } |
| 808 | |
| 809 | /* |
| 810 | * Update a JUL application (given socket) using the given domain. |
| 811 | * |
| 812 | * Note that this function is most likely to be used with a tracing session |
| 813 | * thus the caller should make sure to hold the appropriate lock(s). |
| 814 | */ |
| 815 | void jul_update(struct jul_domain *domain, int sock) |
| 816 | { |
| 817 | int ret; |
| 818 | struct jul_app *app; |
| 819 | struct jul_event *event; |
| 820 | struct lttng_ht_iter iter; |
| 821 | |
| 822 | assert(domain); |
| 823 | assert(sock >= 0); |
| 824 | |
| 825 | DBG("JUL updating app socket %d", sock); |
| 826 | |
| 827 | rcu_read_lock(); |
| 828 | cds_lfht_for_each_entry(domain->events->ht, &iter.iter, event, node.node) { |
| 829 | /* Skip event if disabled. */ |
| 830 | if (!event->enabled) { |
| 831 | continue; |
| 832 | } |
| 833 | |
| 834 | app = jul_find_app_by_sock(sock); |
| 835 | /* |
| 836 | * We are in the registration path thus if the application is gone, |
| 837 | * there is a serious code flow error. |
| 838 | */ |
| 839 | assert(app); |
| 840 | |
| 841 | ret = enable_event(app, event); |
| 842 | if (ret != LTTNG_OK) { |
| 843 | DBG2("JUL update unable to enable event %s on app pid: %d sock %d", |
| 844 | event->name, app->pid, app->sock->fd); |
| 845 | /* Let's try the others here and don't assume the app is dead. */ |
| 846 | continue; |
| 847 | } |
| 848 | } |
| 849 | rcu_read_unlock(); |
| 850 | } |