| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * |
| 4 | * This program is free software; you can redistribute it and/or modify |
| 5 | * it under the terms of the GNU General Public License, version 2 only, |
| 6 | * as published by the Free Software Foundation. |
| 7 | * |
| 8 | * This program is distributed in the hope that it will be useful, |
| 9 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | * GNU General Public License for more details. |
| 12 | * |
| 13 | * You should have received a copy of the GNU General Public License along |
| 14 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 15 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 16 | */ |
| 17 | |
| 18 | #define _LGPL_SOURCE |
| 19 | #include <fcntl.h> |
| 20 | #include <stdlib.h> |
| 21 | #include <stdio.h> |
| 22 | #include <string.h> |
| 23 | #include <unistd.h> |
| 24 | #include <inttypes.h> |
| 25 | |
| 26 | #include <common/common.h> |
| 27 | #include <common/kernel-ctl/kernel-ctl.h> |
| 28 | #include <common/kernel-ctl/kernel-ioctl.h> |
| 29 | #include <common/sessiond-comm/sessiond-comm.h> |
| 30 | |
| 31 | #include "consumer.h" |
| 32 | #include "kernel.h" |
| 33 | #include "kernel-consumer.h" |
| 34 | #include "kern-modules.h" |
| 35 | #include "utils.h" |
| 36 | |
| 37 | /* |
| 38 | * Add context on a kernel channel. |
| 39 | * |
| 40 | * Assumes the ownership of ctx. |
| 41 | */ |
| 42 | int kernel_add_channel_context(struct ltt_kernel_channel *chan, |
| 43 | struct ltt_kernel_context *ctx) |
| 44 | { |
| 45 | int ret; |
| 46 | |
| 47 | assert(chan); |
| 48 | assert(ctx); |
| 49 | |
| 50 | DBG("Adding context to channel %s", chan->channel->name); |
| 51 | ret = kernctl_add_context(chan->fd, &ctx->ctx); |
| 52 | if (ret < 0) { |
| 53 | switch (-ret) { |
| 54 | case ENOSYS: |
| 55 | /* Exists but not available for this kernel */ |
| 56 | ret = LTTNG_ERR_KERN_CONTEXT_UNAVAILABLE; |
| 57 | goto error; |
| 58 | case EEXIST: |
| 59 | /* If EEXIST, we just ignore the error */ |
| 60 | ret = 0; |
| 61 | goto end; |
| 62 | default: |
| 63 | PERROR("add context ioctl"); |
| 64 | ret = LTTNG_ERR_KERN_CONTEXT_FAIL; |
| 65 | goto error; |
| 66 | } |
| 67 | } |
| 68 | |
| 69 | end: |
| 70 | cds_list_add_tail(&ctx->list, &chan->ctx_list); |
| 71 | ctx->in_list = true; |
| 72 | ctx = NULL; |
| 73 | error: |
| 74 | if (ctx) { |
| 75 | trace_kernel_destroy_context(ctx); |
| 76 | } |
| 77 | return ret; |
| 78 | } |
| 79 | |
| 80 | /* |
| 81 | * Create a new kernel session, register it to the kernel tracer and add it to |
| 82 | * the session daemon session. |
| 83 | */ |
| 84 | int kernel_create_session(struct ltt_session *session, int tracer_fd) |
| 85 | { |
| 86 | int ret; |
| 87 | struct ltt_kernel_session *lks; |
| 88 | |
| 89 | assert(session); |
| 90 | |
| 91 | /* Allocate data structure */ |
| 92 | lks = trace_kernel_create_session(); |
| 93 | if (lks == NULL) { |
| 94 | ret = -1; |
| 95 | goto error; |
| 96 | } |
| 97 | |
| 98 | /* Kernel tracer session creation */ |
| 99 | ret = kernctl_create_session(tracer_fd); |
| 100 | if (ret < 0) { |
| 101 | PERROR("ioctl kernel create session"); |
| 102 | goto error; |
| 103 | } |
| 104 | |
| 105 | lks->fd = ret; |
| 106 | /* Prevent fd duplication after execlp() */ |
| 107 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); |
| 108 | if (ret < 0) { |
| 109 | PERROR("fcntl session fd"); |
| 110 | } |
| 111 | |
| 112 | lks->id = session->id; |
| 113 | lks->consumer_fds_sent = 0; |
| 114 | session->kernel_session = lks; |
| 115 | |
| 116 | DBG("Kernel session created (fd: %d)", lks->fd); |
| 117 | |
| 118 | return 0; |
| 119 | |
| 120 | error: |
| 121 | if (lks) { |
| 122 | trace_kernel_destroy_session(lks); |
| 123 | } |
| 124 | return ret; |
| 125 | } |
| 126 | |
| 127 | /* |
| 128 | * Create a kernel channel, register it to the kernel tracer and add it to the |
| 129 | * kernel session. |
| 130 | */ |
| 131 | int kernel_create_channel(struct ltt_kernel_session *session, |
| 132 | struct lttng_channel *chan) |
| 133 | { |
| 134 | int ret; |
| 135 | struct ltt_kernel_channel *lkc; |
| 136 | |
| 137 | assert(session); |
| 138 | assert(chan); |
| 139 | |
| 140 | /* Allocate kernel channel */ |
| 141 | lkc = trace_kernel_create_channel(chan); |
| 142 | if (lkc == NULL) { |
| 143 | goto error; |
| 144 | } |
| 145 | |
| 146 | DBG3("Kernel create channel %s with attr: %d, %" PRIu64 ", %" PRIu64 ", %u, %u, %d, %d", |
| 147 | chan->name, lkc->channel->attr.overwrite, |
| 148 | lkc->channel->attr.subbuf_size, lkc->channel->attr.num_subbuf, |
| 149 | lkc->channel->attr.switch_timer_interval, lkc->channel->attr.read_timer_interval, |
| 150 | lkc->channel->attr.live_timer_interval, lkc->channel->attr.output); |
| 151 | |
| 152 | /* Kernel tracer channel creation */ |
| 153 | ret = kernctl_create_channel(session->fd, &lkc->channel->attr); |
| 154 | if (ret < 0) { |
| 155 | PERROR("ioctl kernel create channel"); |
| 156 | goto error; |
| 157 | } |
| 158 | |
| 159 | /* Setup the channel fd */ |
| 160 | lkc->fd = ret; |
| 161 | /* Prevent fd duplication after execlp() */ |
| 162 | ret = fcntl(lkc->fd, F_SETFD, FD_CLOEXEC); |
| 163 | if (ret < 0) { |
| 164 | PERROR("fcntl session fd"); |
| 165 | } |
| 166 | |
| 167 | /* Add channel to session */ |
| 168 | cds_list_add(&lkc->list, &session->channel_list.head); |
| 169 | session->channel_count++; |
| 170 | lkc->session = session; |
| 171 | |
| 172 | DBG("Kernel channel %s created (fd: %d)", lkc->channel->name, lkc->fd); |
| 173 | |
| 174 | return 0; |
| 175 | |
| 176 | error: |
| 177 | if (lkc) { |
| 178 | free(lkc->channel); |
| 179 | free(lkc); |
| 180 | } |
| 181 | return -1; |
| 182 | } |
| 183 | |
| 184 | /* |
| 185 | * Create a kernel event, enable it to the kernel tracer and add it to the |
| 186 | * channel event list of the kernel session. |
| 187 | * We own filter_expression and filter. |
| 188 | */ |
| 189 | int kernel_create_event(struct lttng_event *ev, |
| 190 | struct ltt_kernel_channel *channel, |
| 191 | char *filter_expression, |
| 192 | struct lttng_filter_bytecode *filter) |
| 193 | { |
| 194 | int ret; |
| 195 | struct ltt_kernel_event *event; |
| 196 | |
| 197 | assert(ev); |
| 198 | assert(channel); |
| 199 | |
| 200 | /* We pass ownership of filter_expression and filter */ |
| 201 | event = trace_kernel_create_event(ev, filter_expression, |
| 202 | filter); |
| 203 | if (event == NULL) { |
| 204 | ret = -1; |
| 205 | goto error; |
| 206 | } |
| 207 | |
| 208 | ret = kernctl_create_event(channel->fd, event->event); |
| 209 | if (ret < 0) { |
| 210 | switch (-ret) { |
| 211 | case EEXIST: |
| 212 | break; |
| 213 | case ENOSYS: |
| 214 | WARN("Event type not implemented"); |
| 215 | break; |
| 216 | case ENOENT: |
| 217 | WARN("Event %s not found!", ev->name); |
| 218 | break; |
| 219 | default: |
| 220 | PERROR("create event ioctl"); |
| 221 | } |
| 222 | goto free_event; |
| 223 | } |
| 224 | |
| 225 | event->type = ev->type; |
| 226 | event->fd = ret; |
| 227 | /* Prevent fd duplication after execlp() */ |
| 228 | ret = fcntl(event->fd, F_SETFD, FD_CLOEXEC); |
| 229 | if (ret < 0) { |
| 230 | PERROR("fcntl session fd"); |
| 231 | } |
| 232 | |
| 233 | if (filter) { |
| 234 | ret = kernctl_filter(event->fd, filter); |
| 235 | if (ret) { |
| 236 | goto filter_error; |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | ret = kernctl_enable(event->fd); |
| 241 | if (ret < 0) { |
| 242 | switch (-ret) { |
| 243 | case EEXIST: |
| 244 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
| 245 | break; |
| 246 | default: |
| 247 | PERROR("enable kernel event"); |
| 248 | break; |
| 249 | } |
| 250 | goto enable_error; |
| 251 | } |
| 252 | |
| 253 | /* Add event to event list */ |
| 254 | cds_list_add(&event->list, &channel->events_list.head); |
| 255 | channel->event_count++; |
| 256 | |
| 257 | DBG("Event %s created (fd: %d)", ev->name, event->fd); |
| 258 | |
| 259 | return 0; |
| 260 | |
| 261 | enable_error: |
| 262 | filter_error: |
| 263 | { |
| 264 | int closeret; |
| 265 | |
| 266 | closeret = close(event->fd); |
| 267 | if (closeret) { |
| 268 | PERROR("close event fd"); |
| 269 | } |
| 270 | } |
| 271 | free_event: |
| 272 | free(event); |
| 273 | error: |
| 274 | return ret; |
| 275 | } |
| 276 | |
| 277 | /* |
| 278 | * Disable a kernel channel. |
| 279 | */ |
| 280 | int kernel_disable_channel(struct ltt_kernel_channel *chan) |
| 281 | { |
| 282 | int ret; |
| 283 | |
| 284 | assert(chan); |
| 285 | |
| 286 | ret = kernctl_disable(chan->fd); |
| 287 | if (ret < 0) { |
| 288 | PERROR("disable chan ioctl"); |
| 289 | goto error; |
| 290 | } |
| 291 | |
| 292 | chan->enabled = 0; |
| 293 | DBG("Kernel channel %s disabled (fd: %d)", chan->channel->name, chan->fd); |
| 294 | |
| 295 | return 0; |
| 296 | |
| 297 | error: |
| 298 | return ret; |
| 299 | } |
| 300 | |
| 301 | /* |
| 302 | * Enable a kernel channel. |
| 303 | */ |
| 304 | int kernel_enable_channel(struct ltt_kernel_channel *chan) |
| 305 | { |
| 306 | int ret; |
| 307 | |
| 308 | assert(chan); |
| 309 | |
| 310 | ret = kernctl_enable(chan->fd); |
| 311 | if (ret < 0 && ret != -EEXIST) { |
| 312 | PERROR("Enable kernel chan"); |
| 313 | goto error; |
| 314 | } |
| 315 | |
| 316 | chan->enabled = 1; |
| 317 | DBG("Kernel channel %s enabled (fd: %d)", chan->channel->name, chan->fd); |
| 318 | |
| 319 | return 0; |
| 320 | |
| 321 | error: |
| 322 | return ret; |
| 323 | } |
| 324 | |
| 325 | /* |
| 326 | * Enable a kernel event. |
| 327 | */ |
| 328 | int kernel_enable_event(struct ltt_kernel_event *event) |
| 329 | { |
| 330 | int ret; |
| 331 | |
| 332 | assert(event); |
| 333 | |
| 334 | ret = kernctl_enable(event->fd); |
| 335 | if (ret < 0) { |
| 336 | switch (-ret) { |
| 337 | case EEXIST: |
| 338 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
| 339 | break; |
| 340 | default: |
| 341 | PERROR("enable kernel event"); |
| 342 | break; |
| 343 | } |
| 344 | goto error; |
| 345 | } |
| 346 | |
| 347 | event->enabled = 1; |
| 348 | DBG("Kernel event %s enabled (fd: %d)", event->event->name, event->fd); |
| 349 | |
| 350 | return 0; |
| 351 | |
| 352 | error: |
| 353 | return ret; |
| 354 | } |
| 355 | |
| 356 | /* |
| 357 | * Disable a kernel event. |
| 358 | */ |
| 359 | int kernel_disable_event(struct ltt_kernel_event *event) |
| 360 | { |
| 361 | int ret; |
| 362 | |
| 363 | assert(event); |
| 364 | |
| 365 | ret = kernctl_disable(event->fd); |
| 366 | if (ret < 0) { |
| 367 | switch (-ret) { |
| 368 | case EEXIST: |
| 369 | ret = LTTNG_ERR_KERN_EVENT_EXIST; |
| 370 | break; |
| 371 | default: |
| 372 | PERROR("disable kernel event"); |
| 373 | break; |
| 374 | } |
| 375 | goto error; |
| 376 | } |
| 377 | |
| 378 | event->enabled = 0; |
| 379 | DBG("Kernel event %s disabled (fd: %d)", event->event->name, event->fd); |
| 380 | |
| 381 | return 0; |
| 382 | |
| 383 | error: |
| 384 | return ret; |
| 385 | } |
| 386 | |
| 387 | static |
| 388 | struct lttng_tracker_list *get_id_tracker_list(struct ltt_kernel_session *session, |
| 389 | enum lttng_tracker_type tracker_type) |
| 390 | { |
| 391 | switch (tracker_type) { |
| 392 | case LTTNG_TRACKER_PID: |
| 393 | return session->tracker_list_pid; |
| 394 | case LTTNG_TRACKER_VPID: |
| 395 | return session->tracker_list_vpid; |
| 396 | case LTTNG_TRACKER_UID: |
| 397 | return session->tracker_list_uid; |
| 398 | case LTTNG_TRACKER_VUID: |
| 399 | return session->tracker_list_vuid; |
| 400 | case LTTNG_TRACKER_GID: |
| 401 | return session->tracker_list_gid; |
| 402 | case LTTNG_TRACKER_VGID: |
| 403 | return session->tracker_list_vgid; |
| 404 | default: |
| 405 | return NULL; |
| 406 | } |
| 407 | } |
| 408 | |
| 409 | int kernel_track_id(enum lttng_tracker_type tracker_type, |
| 410 | struct ltt_kernel_session *session, |
| 411 | struct lttng_tracker_id *id) |
| 412 | { |
| 413 | int ret, value; |
| 414 | struct lttng_tracker_list *tracker_list; |
| 415 | struct lttng_tracker_id *saved_ids; |
| 416 | ssize_t saved_ids_count, i; |
| 417 | |
| 418 | ret = lttng_tracker_id_lookup_string(tracker_type, |
| 419 | id, &value); |
| 420 | if (ret != LTTNG_OK) { |
| 421 | return ret; |
| 422 | } |
| 423 | |
| 424 | tracker_list = get_id_tracker_list(session, tracker_type); |
| 425 | if (!tracker_list) { |
| 426 | return LTTNG_ERR_INVALID; |
| 427 | } |
| 428 | /* Save list for restore on error. */ |
| 429 | saved_ids_count = lttng_tracker_id_get_list(tracker_list, &saved_ids); |
| 430 | if (saved_ids_count < 0) { |
| 431 | return LTTNG_ERR_INVALID; |
| 432 | } |
| 433 | /* Add to list. */ |
| 434 | ret = lttng_tracker_list_add(tracker_list, id); |
| 435 | if (ret != LTTNG_OK) { |
| 436 | goto end; |
| 437 | } |
| 438 | |
| 439 | switch (tracker_type) { |
| 440 | case LTTNG_TRACKER_PID: |
| 441 | DBG("Kernel track PID %d for session id %" PRIu64 ".", |
| 442 | value, session->id); |
| 443 | ret = kernctl_track_pid(session->fd, value); |
| 444 | if (!ret) { |
| 445 | ret = LTTNG_OK; |
| 446 | goto end; |
| 447 | } |
| 448 | break; |
| 449 | case LTTNG_TRACKER_VPID: |
| 450 | DBG("Kernel track VPID %d for session id %" PRIu64 ".", |
| 451 | value, session->id); |
| 452 | ret = kernctl_track_id(session->fd, LTTNG_TRACKER_VPID, value); |
| 453 | if (!ret) { |
| 454 | ret = LTTNG_OK; |
| 455 | goto end; |
| 456 | } |
| 457 | break; |
| 458 | case LTTNG_TRACKER_UID: |
| 459 | DBG("Kernel track UID %d for session id %" PRIu64 ".", |
| 460 | value, session->id); |
| 461 | ret = kernctl_track_id(session->fd, LTTNG_TRACKER_UID, value); |
| 462 | if (!ret) { |
| 463 | ret = LTTNG_OK; |
| 464 | goto end; |
| 465 | } |
| 466 | break; |
| 467 | case LTTNG_TRACKER_GID: |
| 468 | DBG("Kernel track GID %d for session id %" PRIu64 ".", |
| 469 | value, session->id); |
| 470 | ret = kernctl_track_id(session->fd, LTTNG_TRACKER_GID, value); |
| 471 | if (!ret) { |
| 472 | ret = LTTNG_OK; |
| 473 | goto end; |
| 474 | } |
| 475 | break; |
| 476 | case LTTNG_TRACKER_VUID: |
| 477 | DBG("Kernel track VUID %d for session id %" PRIu64 ".", |
| 478 | value, session->id); |
| 479 | ret = kernctl_track_id(session->fd, LTTNG_TRACKER_VUID, value); |
| 480 | if (!ret) { |
| 481 | ret = LTTNG_OK; |
| 482 | goto end; |
| 483 | } |
| 484 | break; |
| 485 | case LTTNG_TRACKER_VGID: |
| 486 | DBG("Kernel track VGID %d for session id %" PRIu64 ".", |
| 487 | value, session->id); |
| 488 | ret = kernctl_track_id(session->fd, LTTNG_TRACKER_VGID, value); |
| 489 | if (!ret) { |
| 490 | ret = LTTNG_OK; |
| 491 | goto end; |
| 492 | } |
| 493 | break; |
| 494 | default: |
| 495 | ret = -EINVAL; |
| 496 | break; |
| 497 | } |
| 498 | /* Error handling. */ |
| 499 | switch (-ret) { |
| 500 | case EINVAL: |
| 501 | ret = LTTNG_ERR_INVALID; |
| 502 | break; |
| 503 | case ENOMEM: |
| 504 | ret = LTTNG_ERR_NOMEM; |
| 505 | break; |
| 506 | case EEXIST: |
| 507 | ret = LTTNG_ERR_ID_TRACKED; |
| 508 | break; |
| 509 | default: |
| 510 | ret = LTTNG_ERR_UNK; |
| 511 | break; |
| 512 | } |
| 513 | if (lttng_tracker_id_set_list(tracker_list, saved_ids, saved_ids_count) != LTTNG_OK) { |
| 514 | ERR("Error on tracker add error handling.\n"); |
| 515 | } |
| 516 | end: |
| 517 | for (i = 0; i < saved_ids_count; i++) { |
| 518 | free(saved_ids[i].string); |
| 519 | } |
| 520 | free(saved_ids); |
| 521 | return ret; |
| 522 | } |
| 523 | |
| 524 | int kernel_untrack_id(enum lttng_tracker_type tracker_type, |
| 525 | struct ltt_kernel_session *session, |
| 526 | struct lttng_tracker_id *id) |
| 527 | { |
| 528 | int ret, value; |
| 529 | struct lttng_tracker_list *tracker_list; |
| 530 | struct lttng_tracker_id *saved_ids; |
| 531 | ssize_t saved_ids_count, i; |
| 532 | |
| 533 | ret = lttng_tracker_id_lookup_string(tracker_type, |
| 534 | id, &value); |
| 535 | if (ret != LTTNG_OK) { |
| 536 | return ret; |
| 537 | } |
| 538 | |
| 539 | tracker_list = get_id_tracker_list(session, tracker_type); |
| 540 | if (!tracker_list) { |
| 541 | return LTTNG_ERR_INVALID; |
| 542 | } |
| 543 | /* Save list for restore on error. */ |
| 544 | saved_ids_count = lttng_tracker_id_get_list(tracker_list, &saved_ids); |
| 545 | if (saved_ids_count < 0) { |
| 546 | return LTTNG_ERR_INVALID; |
| 547 | } |
| 548 | /* Remove from list. */ |
| 549 | ret = lttng_tracker_list_remove(tracker_list, id); |
| 550 | if (ret != LTTNG_OK) { |
| 551 | goto end; |
| 552 | } |
| 553 | |
| 554 | switch (tracker_type) { |
| 555 | case LTTNG_TRACKER_PID: |
| 556 | DBG("Kernel untrack PID %d for session id %" PRIu64 ".", |
| 557 | value, session->id); |
| 558 | ret = kernctl_untrack_pid(session->fd, value); |
| 559 | if (!ret) { |
| 560 | ret = LTTNG_OK; |
| 561 | goto end; |
| 562 | } |
| 563 | break; |
| 564 | case LTTNG_TRACKER_VPID: |
| 565 | DBG("Kernel untrack VPID %d for session id %" PRIu64 ".", |
| 566 | value, session->id); |
| 567 | ret = kernctl_untrack_id(session->fd, LTTNG_TRACKER_VPID, value); |
| 568 | if (!ret) { |
| 569 | ret = LTTNG_OK; |
| 570 | goto end; |
| 571 | } |
| 572 | break; |
| 573 | case LTTNG_TRACKER_UID: |
| 574 | DBG("Kernel untrack UID %d for session id %" PRIu64 ".", |
| 575 | value, session->id); |
| 576 | ret = kernctl_untrack_id(session->fd, LTTNG_TRACKER_UID, value); |
| 577 | if (!ret) { |
| 578 | ret = LTTNG_OK; |
| 579 | goto end; |
| 580 | } |
| 581 | break; |
| 582 | case LTTNG_TRACKER_GID: |
| 583 | DBG("Kernel untrack GID %d for session id %" PRIu64 ".", |
| 584 | value, session->id); |
| 585 | ret = kernctl_untrack_id(session->fd, LTTNG_TRACKER_GID, value); |
| 586 | if (!ret) { |
| 587 | ret = LTTNG_OK; |
| 588 | goto end; |
| 589 | } |
| 590 | break; |
| 591 | case LTTNG_TRACKER_VUID: |
| 592 | DBG("Kernel untrack VUID %d for session id %" PRIu64 ".", |
| 593 | value, session->id); |
| 594 | ret = kernctl_untrack_id(session->fd, LTTNG_TRACKER_VUID, value); |
| 595 | if (!ret) { |
| 596 | ret = LTTNG_OK; |
| 597 | goto end; |
| 598 | } |
| 599 | break; |
| 600 | case LTTNG_TRACKER_VGID: |
| 601 | DBG("Kernel untrack VGID %d for session id %" PRIu64 ".", |
| 602 | value, session->id); |
| 603 | ret = kernctl_untrack_id(session->fd, LTTNG_TRACKER_VGID, value); |
| 604 | if (!ret) { |
| 605 | ret = LTTNG_OK; |
| 606 | goto end; |
| 607 | } |
| 608 | break; |
| 609 | default: |
| 610 | ret = -EINVAL; |
| 611 | break; |
| 612 | } |
| 613 | |
| 614 | /* Error handling. */ |
| 615 | switch (-ret) { |
| 616 | case EINVAL: |
| 617 | ret = LTTNG_ERR_INVALID; |
| 618 | break; |
| 619 | case ENOMEM: |
| 620 | ret = LTTNG_ERR_NOMEM; |
| 621 | break; |
| 622 | case EEXIST: |
| 623 | ret = LTTNG_ERR_ID_TRACKED; |
| 624 | break; |
| 625 | default: |
| 626 | ret = LTTNG_ERR_UNK; |
| 627 | break; |
| 628 | } |
| 629 | |
| 630 | if (lttng_tracker_id_set_list(tracker_list, saved_ids, saved_ids_count) != LTTNG_OK) { |
| 631 | ERR("Error on tracker remove error handling.\n"); |
| 632 | } |
| 633 | end: |
| 634 | for (i = 0; i < saved_ids_count; i++) { |
| 635 | free(saved_ids[i].string); |
| 636 | } |
| 637 | free(saved_ids); |
| 638 | return ret; |
| 639 | } |
| 640 | |
| 641 | /* |
| 642 | * Called with session lock held. |
| 643 | */ |
| 644 | ssize_t kernel_list_tracker_ids(enum lttng_tracker_type tracker_type, |
| 645 | struct ltt_kernel_session *session, |
| 646 | struct lttng_tracker_id **_ids) |
| 647 | { |
| 648 | struct lttng_tracker_list *tracker_list; |
| 649 | |
| 650 | tracker_list = get_id_tracker_list(session, tracker_type); |
| 651 | if (!tracker_list) { |
| 652 | return -LTTNG_ERR_INVALID; |
| 653 | } |
| 654 | return lttng_tracker_id_get_list(tracker_list, _ids); |
| 655 | } |
| 656 | |
| 657 | /* |
| 658 | * Create kernel metadata, open from the kernel tracer and add it to the |
| 659 | * kernel session. |
| 660 | */ |
| 661 | int kernel_open_metadata(struct ltt_kernel_session *session) |
| 662 | { |
| 663 | int ret; |
| 664 | struct ltt_kernel_metadata *lkm = NULL; |
| 665 | |
| 666 | assert(session); |
| 667 | |
| 668 | /* Allocate kernel metadata */ |
| 669 | lkm = trace_kernel_create_metadata(); |
| 670 | if (lkm == NULL) { |
| 671 | goto error; |
| 672 | } |
| 673 | |
| 674 | /* Kernel tracer metadata creation */ |
| 675 | ret = kernctl_open_metadata(session->fd, &lkm->conf->attr); |
| 676 | if (ret < 0) { |
| 677 | goto error_open; |
| 678 | } |
| 679 | |
| 680 | lkm->fd = ret; |
| 681 | /* Prevent fd duplication after execlp() */ |
| 682 | ret = fcntl(lkm->fd, F_SETFD, FD_CLOEXEC); |
| 683 | if (ret < 0) { |
| 684 | PERROR("fcntl session fd"); |
| 685 | } |
| 686 | |
| 687 | session->metadata = lkm; |
| 688 | |
| 689 | DBG("Kernel metadata opened (fd: %d)", lkm->fd); |
| 690 | |
| 691 | return 0; |
| 692 | |
| 693 | error_open: |
| 694 | trace_kernel_destroy_metadata(lkm); |
| 695 | error: |
| 696 | return -1; |
| 697 | } |
| 698 | |
| 699 | /* |
| 700 | * Start tracing session. |
| 701 | */ |
| 702 | int kernel_start_session(struct ltt_kernel_session *session) |
| 703 | { |
| 704 | int ret; |
| 705 | |
| 706 | assert(session); |
| 707 | |
| 708 | ret = kernctl_start_session(session->fd); |
| 709 | if (ret < 0) { |
| 710 | PERROR("ioctl start session"); |
| 711 | goto error; |
| 712 | } |
| 713 | |
| 714 | DBG("Kernel session started"); |
| 715 | |
| 716 | return 0; |
| 717 | |
| 718 | error: |
| 719 | return ret; |
| 720 | } |
| 721 | |
| 722 | /* |
| 723 | * Make a kernel wait to make sure in-flight probe have completed. |
| 724 | */ |
| 725 | void kernel_wait_quiescent(int fd) |
| 726 | { |
| 727 | int ret; |
| 728 | |
| 729 | DBG("Kernel quiescent wait on %d", fd); |
| 730 | |
| 731 | ret = kernctl_wait_quiescent(fd); |
| 732 | if (ret < 0) { |
| 733 | PERROR("wait quiescent ioctl"); |
| 734 | ERR("Kernel quiescent wait failed"); |
| 735 | } |
| 736 | } |
| 737 | |
| 738 | /* |
| 739 | * Force flush buffer of metadata. |
| 740 | */ |
| 741 | int kernel_metadata_flush_buffer(int fd) |
| 742 | { |
| 743 | int ret; |
| 744 | |
| 745 | DBG("Kernel flushing metadata buffer on fd %d", fd); |
| 746 | |
| 747 | ret = kernctl_buffer_flush(fd); |
| 748 | if (ret < 0) { |
| 749 | ERR("Fail to flush metadata buffers %d (ret: %d)", fd, ret); |
| 750 | } |
| 751 | |
| 752 | return 0; |
| 753 | } |
| 754 | |
| 755 | /* |
| 756 | * Force flush buffer for channel. |
| 757 | */ |
| 758 | int kernel_flush_buffer(struct ltt_kernel_channel *channel) |
| 759 | { |
| 760 | int ret; |
| 761 | struct ltt_kernel_stream *stream; |
| 762 | |
| 763 | assert(channel); |
| 764 | |
| 765 | DBG("Flush buffer for channel %s", channel->channel->name); |
| 766 | |
| 767 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
| 768 | DBG("Flushing channel stream %d", stream->fd); |
| 769 | ret = kernctl_buffer_flush(stream->fd); |
| 770 | if (ret < 0) { |
| 771 | PERROR("ioctl"); |
| 772 | ERR("Fail to flush buffer for stream %d (ret: %d)", |
| 773 | stream->fd, ret); |
| 774 | } |
| 775 | } |
| 776 | |
| 777 | return 0; |
| 778 | } |
| 779 | |
| 780 | /* |
| 781 | * Stop tracing session. |
| 782 | */ |
| 783 | int kernel_stop_session(struct ltt_kernel_session *session) |
| 784 | { |
| 785 | int ret; |
| 786 | |
| 787 | assert(session); |
| 788 | |
| 789 | ret = kernctl_stop_session(session->fd); |
| 790 | if (ret < 0) { |
| 791 | goto error; |
| 792 | } |
| 793 | |
| 794 | DBG("Kernel session stopped"); |
| 795 | |
| 796 | return 0; |
| 797 | |
| 798 | error: |
| 799 | return ret; |
| 800 | } |
| 801 | |
| 802 | /* |
| 803 | * Open stream of channel, register it to the kernel tracer and add it |
| 804 | * to the stream list of the channel. |
| 805 | * |
| 806 | * Note: given that the streams may appear in random order wrt CPU |
| 807 | * number (e.g. cpu hotplug), the index value of the stream number in |
| 808 | * the stream name is not necessarily linked to the CPU number. |
| 809 | * |
| 810 | * Return the number of created stream. Else, a negative value. |
| 811 | */ |
| 812 | int kernel_open_channel_stream(struct ltt_kernel_channel *channel) |
| 813 | { |
| 814 | int ret; |
| 815 | struct ltt_kernel_stream *lks; |
| 816 | |
| 817 | assert(channel); |
| 818 | |
| 819 | while ((ret = kernctl_create_stream(channel->fd)) >= 0) { |
| 820 | lks = trace_kernel_create_stream(channel->channel->name, |
| 821 | channel->stream_count); |
| 822 | if (lks == NULL) { |
| 823 | ret = close(ret); |
| 824 | if (ret) { |
| 825 | PERROR("close"); |
| 826 | } |
| 827 | goto error; |
| 828 | } |
| 829 | |
| 830 | lks->fd = ret; |
| 831 | /* Prevent fd duplication after execlp() */ |
| 832 | ret = fcntl(lks->fd, F_SETFD, FD_CLOEXEC); |
| 833 | if (ret < 0) { |
| 834 | PERROR("fcntl session fd"); |
| 835 | } |
| 836 | |
| 837 | lks->tracefile_size = channel->channel->attr.tracefile_size; |
| 838 | lks->tracefile_count = channel->channel->attr.tracefile_count; |
| 839 | |
| 840 | /* Add stream to channel stream list */ |
| 841 | cds_list_add(&lks->list, &channel->stream_list.head); |
| 842 | channel->stream_count++; |
| 843 | |
| 844 | DBG("Kernel stream %s created (fd: %d, state: %d)", lks->name, lks->fd, |
| 845 | lks->state); |
| 846 | } |
| 847 | |
| 848 | return channel->stream_count; |
| 849 | |
| 850 | error: |
| 851 | return -1; |
| 852 | } |
| 853 | |
| 854 | /* |
| 855 | * Open the metadata stream and set it to the kernel session. |
| 856 | */ |
| 857 | int kernel_open_metadata_stream(struct ltt_kernel_session *session) |
| 858 | { |
| 859 | int ret; |
| 860 | |
| 861 | assert(session); |
| 862 | |
| 863 | ret = kernctl_create_stream(session->metadata->fd); |
| 864 | if (ret < 0) { |
| 865 | PERROR("kernel create metadata stream"); |
| 866 | goto error; |
| 867 | } |
| 868 | |
| 869 | DBG("Kernel metadata stream created (fd: %d)", ret); |
| 870 | session->metadata_stream_fd = ret; |
| 871 | /* Prevent fd duplication after execlp() */ |
| 872 | ret = fcntl(session->metadata_stream_fd, F_SETFD, FD_CLOEXEC); |
| 873 | if (ret < 0) { |
| 874 | PERROR("fcntl session fd"); |
| 875 | } |
| 876 | |
| 877 | return 0; |
| 878 | |
| 879 | error: |
| 880 | return -1; |
| 881 | } |
| 882 | |
| 883 | /* |
| 884 | * Get the event list from the kernel tracer and return the number of elements. |
| 885 | */ |
| 886 | ssize_t kernel_list_events(int tracer_fd, struct lttng_event **events) |
| 887 | { |
| 888 | int fd, ret; |
| 889 | char *event; |
| 890 | size_t nbmem, count = 0; |
| 891 | FILE *fp; |
| 892 | struct lttng_event *elist; |
| 893 | |
| 894 | assert(events); |
| 895 | |
| 896 | fd = kernctl_tracepoint_list(tracer_fd); |
| 897 | if (fd < 0) { |
| 898 | PERROR("kernel tracepoint list"); |
| 899 | goto error; |
| 900 | } |
| 901 | |
| 902 | fp = fdopen(fd, "r"); |
| 903 | if (fp == NULL) { |
| 904 | PERROR("kernel tracepoint list fdopen"); |
| 905 | goto error_fp; |
| 906 | } |
| 907 | |
| 908 | /* |
| 909 | * Init memory size counter |
| 910 | * See kernel-ctl.h for explanation of this value |
| 911 | */ |
| 912 | nbmem = KERNEL_EVENT_INIT_LIST_SIZE; |
| 913 | elist = zmalloc(sizeof(struct lttng_event) * nbmem); |
| 914 | if (elist == NULL) { |
| 915 | PERROR("alloc list events"); |
| 916 | count = -ENOMEM; |
| 917 | goto end; |
| 918 | } |
| 919 | |
| 920 | while (fscanf(fp, "event { name = %m[^;]; };\n", &event) == 1) { |
| 921 | if (count >= nbmem) { |
| 922 | struct lttng_event *new_elist; |
| 923 | size_t new_nbmem; |
| 924 | |
| 925 | new_nbmem = nbmem << 1; |
| 926 | DBG("Reallocating event list from %zu to %zu bytes", |
| 927 | nbmem, new_nbmem); |
| 928 | new_elist = realloc(elist, new_nbmem * sizeof(struct lttng_event)); |
| 929 | if (new_elist == NULL) { |
| 930 | PERROR("realloc list events"); |
| 931 | free(event); |
| 932 | free(elist); |
| 933 | count = -ENOMEM; |
| 934 | goto end; |
| 935 | } |
| 936 | /* Zero the new memory */ |
| 937 | memset(new_elist + nbmem, 0, |
| 938 | (new_nbmem - nbmem) * sizeof(struct lttng_event)); |
| 939 | nbmem = new_nbmem; |
| 940 | elist = new_elist; |
| 941 | } |
| 942 | strncpy(elist[count].name, event, LTTNG_SYMBOL_NAME_LEN); |
| 943 | elist[count].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
| 944 | elist[count].enabled = -1; |
| 945 | count++; |
| 946 | free(event); |
| 947 | } |
| 948 | |
| 949 | *events = elist; |
| 950 | DBG("Kernel list events done (%zu events)", count); |
| 951 | end: |
| 952 | ret = fclose(fp); /* closes both fp and fd */ |
| 953 | if (ret) { |
| 954 | PERROR("fclose"); |
| 955 | } |
| 956 | return count; |
| 957 | |
| 958 | error_fp: |
| 959 | ret = close(fd); |
| 960 | if (ret) { |
| 961 | PERROR("close"); |
| 962 | } |
| 963 | error: |
| 964 | return -1; |
| 965 | } |
| 966 | |
| 967 | /* |
| 968 | * Get kernel version and validate it. |
| 969 | */ |
| 970 | int kernel_validate_version(int tracer_fd) |
| 971 | { |
| 972 | int ret; |
| 973 | struct lttng_kernel_tracer_version version; |
| 974 | struct lttng_kernel_tracer_abi_version abi_version; |
| 975 | |
| 976 | ret = kernctl_tracer_version(tracer_fd, &version); |
| 977 | if (ret < 0) { |
| 978 | ERR("Failed to retrieve the lttng-modules version"); |
| 979 | goto error; |
| 980 | } |
| 981 | |
| 982 | /* Validate version */ |
| 983 | if (version.major != VERSION_MAJOR) { |
| 984 | ERR("Kernel tracer major version (%d) is not compatible with lttng-tools major version (%d)", |
| 985 | version.major, VERSION_MAJOR); |
| 986 | goto error_version; |
| 987 | } |
| 988 | ret = kernctl_tracer_abi_version(tracer_fd, &abi_version); |
| 989 | if (ret < 0) { |
| 990 | ERR("Failed to retrieve lttng-modules ABI version"); |
| 991 | goto error; |
| 992 | } |
| 993 | if (abi_version.major != LTTNG_MODULES_ABI_MAJOR_VERSION) { |
| 994 | ERR("Kernel tracer ABI version (%d.%d) does not match the expected ABI major version (%d.*)", |
| 995 | abi_version.major, abi_version.minor, |
| 996 | LTTNG_MODULES_ABI_MAJOR_VERSION); |
| 997 | goto error; |
| 998 | } |
| 999 | DBG2("Kernel tracer version validated (%d.%d, ABI %d.%d)", |
| 1000 | version.major, version.minor, |
| 1001 | abi_version.major, abi_version.minor); |
| 1002 | return 0; |
| 1003 | |
| 1004 | error_version: |
| 1005 | ret = -1; |
| 1006 | |
| 1007 | error: |
| 1008 | ERR("Kernel tracer version check failed; kernel tracing will not be available"); |
| 1009 | return ret; |
| 1010 | } |
| 1011 | |
| 1012 | /* |
| 1013 | * Kernel work-arounds called at the start of sessiond main(). |
| 1014 | */ |
| 1015 | int init_kernel_workarounds(void) |
| 1016 | { |
| 1017 | int ret; |
| 1018 | FILE *fp; |
| 1019 | |
| 1020 | /* |
| 1021 | * boot_id needs to be read once before being used concurrently |
| 1022 | * to deal with a Linux kernel race. A fix is proposed for |
| 1023 | * upstream, but the work-around is needed for older kernels. |
| 1024 | */ |
| 1025 | fp = fopen("/proc/sys/kernel/random/boot_id", "r"); |
| 1026 | if (!fp) { |
| 1027 | goto end_boot_id; |
| 1028 | } |
| 1029 | while (!feof(fp)) { |
| 1030 | char buf[37] = ""; |
| 1031 | |
| 1032 | ret = fread(buf, 1, sizeof(buf), fp); |
| 1033 | if (ret < 0) { |
| 1034 | /* Ignore error, we don't really care */ |
| 1035 | } |
| 1036 | } |
| 1037 | ret = fclose(fp); |
| 1038 | if (ret) { |
| 1039 | PERROR("fclose"); |
| 1040 | } |
| 1041 | end_boot_id: |
| 1042 | return 0; |
| 1043 | } |
| 1044 | |
| 1045 | /* |
| 1046 | * Complete teardown of a kernel session. |
| 1047 | */ |
| 1048 | void kernel_destroy_session(struct ltt_kernel_session *ksess) |
| 1049 | { |
| 1050 | if (ksess == NULL) { |
| 1051 | DBG3("No kernel session when tearing down session"); |
| 1052 | return; |
| 1053 | } |
| 1054 | |
| 1055 | DBG("Tearing down kernel session"); |
| 1056 | |
| 1057 | /* |
| 1058 | * Destroy channels on the consumer if at least one FD has been sent and we |
| 1059 | * are in no output mode because the streams are in *no* monitor mode so we |
| 1060 | * have to send a command to clean them up or else they leaked. |
| 1061 | */ |
| 1062 | if (!ksess->output_traces && ksess->consumer_fds_sent) { |
| 1063 | int ret; |
| 1064 | struct consumer_socket *socket; |
| 1065 | struct lttng_ht_iter iter; |
| 1066 | |
| 1067 | /* For each consumer socket. */ |
| 1068 | rcu_read_lock(); |
| 1069 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
| 1070 | socket, node.node) { |
| 1071 | struct ltt_kernel_channel *chan; |
| 1072 | |
| 1073 | /* For each channel, ask the consumer to destroy it. */ |
| 1074 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
| 1075 | ret = kernel_consumer_destroy_channel(socket, chan); |
| 1076 | if (ret < 0) { |
| 1077 | /* Consumer is probably dead. Use next socket. */ |
| 1078 | continue; |
| 1079 | } |
| 1080 | } |
| 1081 | } |
| 1082 | rcu_read_unlock(); |
| 1083 | } |
| 1084 | |
| 1085 | /* Close any relayd session */ |
| 1086 | consumer_output_send_destroy_relayd(ksess->consumer); |
| 1087 | |
| 1088 | trace_kernel_destroy_session(ksess); |
| 1089 | } |
| 1090 | |
| 1091 | /* |
| 1092 | * Destroy a kernel channel object. It does not do anything on the tracer side. |
| 1093 | */ |
| 1094 | void kernel_destroy_channel(struct ltt_kernel_channel *kchan) |
| 1095 | { |
| 1096 | struct ltt_kernel_session *ksess = NULL; |
| 1097 | |
| 1098 | assert(kchan); |
| 1099 | assert(kchan->channel); |
| 1100 | |
| 1101 | DBG3("Kernel destroy channel %s", kchan->channel->name); |
| 1102 | |
| 1103 | /* Update channel count of associated session. */ |
| 1104 | if (kchan->session) { |
| 1105 | /* Keep pointer reference so we can update it after the destroy. */ |
| 1106 | ksess = kchan->session; |
| 1107 | } |
| 1108 | |
| 1109 | trace_kernel_destroy_channel(kchan); |
| 1110 | |
| 1111 | /* |
| 1112 | * At this point the kernel channel is not visible anymore. This is safe |
| 1113 | * since in order to work on a visible kernel session, the tracing session |
| 1114 | * lock (ltt_session.lock) MUST be acquired. |
| 1115 | */ |
| 1116 | if (ksess) { |
| 1117 | ksess->channel_count--; |
| 1118 | } |
| 1119 | } |
| 1120 | |
| 1121 | /* |
| 1122 | * Take a snapshot for a given kernel session. |
| 1123 | * |
| 1124 | * Return 0 on success or else return a LTTNG_ERR code. |
| 1125 | */ |
| 1126 | int kernel_snapshot_record(struct ltt_kernel_session *ksess, |
| 1127 | struct snapshot_output *output, int wait, |
| 1128 | uint64_t nb_packets_per_stream) |
| 1129 | { |
| 1130 | int err, ret, saved_metadata_fd; |
| 1131 | struct consumer_socket *socket; |
| 1132 | struct lttng_ht_iter iter; |
| 1133 | struct ltt_kernel_metadata *saved_metadata; |
| 1134 | |
| 1135 | assert(ksess); |
| 1136 | assert(ksess->consumer); |
| 1137 | assert(output); |
| 1138 | |
| 1139 | DBG("Kernel snapshot record started"); |
| 1140 | |
| 1141 | /* Save current metadata since the following calls will change it. */ |
| 1142 | saved_metadata = ksess->metadata; |
| 1143 | saved_metadata_fd = ksess->metadata_stream_fd; |
| 1144 | |
| 1145 | rcu_read_lock(); |
| 1146 | |
| 1147 | ret = kernel_open_metadata(ksess); |
| 1148 | if (ret < 0) { |
| 1149 | ret = LTTNG_ERR_KERN_META_FAIL; |
| 1150 | goto error; |
| 1151 | } |
| 1152 | |
| 1153 | ret = kernel_open_metadata_stream(ksess); |
| 1154 | if (ret < 0) { |
| 1155 | ret = LTTNG_ERR_KERN_META_FAIL; |
| 1156 | goto error_open_stream; |
| 1157 | } |
| 1158 | |
| 1159 | /* Send metadata to consumer and snapshot everything. */ |
| 1160 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, &iter.iter, |
| 1161 | socket, node.node) { |
| 1162 | struct consumer_output *saved_output; |
| 1163 | struct ltt_kernel_channel *chan; |
| 1164 | |
| 1165 | /* |
| 1166 | * Temporarly switch consumer output for our snapshot output. As long |
| 1167 | * as the session lock is taken, this is safe. |
| 1168 | */ |
| 1169 | saved_output = ksess->consumer; |
| 1170 | ksess->consumer = output->consumer; |
| 1171 | |
| 1172 | pthread_mutex_lock(socket->lock); |
| 1173 | /* This stream must not be monitored by the consumer. */ |
| 1174 | ret = kernel_consumer_add_metadata(socket, ksess, 0); |
| 1175 | pthread_mutex_unlock(socket->lock); |
| 1176 | /* Put back the saved consumer output into the session. */ |
| 1177 | ksess->consumer = saved_output; |
| 1178 | if (ret < 0) { |
| 1179 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
| 1180 | goto error_consumer; |
| 1181 | } |
| 1182 | |
| 1183 | /* For each channel, ask the consumer to snapshot it. */ |
| 1184 | cds_list_for_each_entry(chan, &ksess->channel_list.head, list) { |
| 1185 | ret = consumer_snapshot_channel(socket, chan->fd, output, 0, |
| 1186 | ksess->uid, ksess->gid, |
| 1187 | DEFAULT_KERNEL_TRACE_DIR, wait, |
| 1188 | nb_packets_per_stream); |
| 1189 | if (ret < 0) { |
| 1190 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
| 1191 | (void) kernel_consumer_destroy_metadata(socket, |
| 1192 | ksess->metadata); |
| 1193 | goto error_consumer; |
| 1194 | } |
| 1195 | } |
| 1196 | |
| 1197 | /* Snapshot metadata, */ |
| 1198 | ret = consumer_snapshot_channel(socket, ksess->metadata->fd, output, |
| 1199 | 1, ksess->uid, ksess->gid, |
| 1200 | DEFAULT_KERNEL_TRACE_DIR, wait, 0); |
| 1201 | if (ret < 0) { |
| 1202 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
| 1203 | goto error_consumer; |
| 1204 | } |
| 1205 | |
| 1206 | /* |
| 1207 | * The metadata snapshot is done, ask the consumer to destroy it since |
| 1208 | * it's not monitored on the consumer side. |
| 1209 | */ |
| 1210 | (void) kernel_consumer_destroy_metadata(socket, ksess->metadata); |
| 1211 | } |
| 1212 | |
| 1213 | ret = LTTNG_OK; |
| 1214 | |
| 1215 | error_consumer: |
| 1216 | /* Close newly opened metadata stream. It's now on the consumer side. */ |
| 1217 | err = close(ksess->metadata_stream_fd); |
| 1218 | if (err < 0) { |
| 1219 | PERROR("close snapshot kernel"); |
| 1220 | } |
| 1221 | |
| 1222 | error_open_stream: |
| 1223 | trace_kernel_destroy_metadata(ksess->metadata); |
| 1224 | error: |
| 1225 | /* Restore metadata state.*/ |
| 1226 | ksess->metadata = saved_metadata; |
| 1227 | ksess->metadata_stream_fd = saved_metadata_fd; |
| 1228 | |
| 1229 | rcu_read_unlock(); |
| 1230 | return ret; |
| 1231 | } |
| 1232 | |
| 1233 | /* |
| 1234 | * Get the syscall mask array from the kernel tracer. |
| 1235 | * |
| 1236 | * Return 0 on success else a negative value. In both case, syscall_mask should |
| 1237 | * be freed. |
| 1238 | */ |
| 1239 | int kernel_syscall_mask(int chan_fd, char **syscall_mask, uint32_t *nr_bits) |
| 1240 | { |
| 1241 | assert(syscall_mask); |
| 1242 | assert(nr_bits); |
| 1243 | |
| 1244 | return kernctl_syscall_mask(chan_fd, syscall_mask, nr_bits); |
| 1245 | } |