| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License as published by the Free |
| 7 | * Software Foundation; only version 2 of the License. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along with |
| 15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| 16 | * Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #define _GNU_SOURCE |
| 20 | #include <fcntl.h> |
| 21 | #include <getopt.h> |
| 22 | #include <grp.h> |
| 23 | #include <limits.h> |
| 24 | #include <pthread.h> |
| 25 | #include <semaphore.h> |
| 26 | #include <signal.h> |
| 27 | #include <stdio.h> |
| 28 | #include <stdlib.h> |
| 29 | #include <string.h> |
| 30 | #include <sys/mman.h> |
| 31 | #include <sys/mount.h> |
| 32 | #include <sys/resource.h> |
| 33 | #include <sys/socket.h> |
| 34 | #include <sys/stat.h> |
| 35 | #include <sys/types.h> |
| 36 | #include <sys/wait.h> |
| 37 | #include <urcu/futex.h> |
| 38 | #include <unistd.h> |
| 39 | |
| 40 | #include <ltt-kconsumerd.h> |
| 41 | #include <lttng-sessiond-comm.h> |
| 42 | #include <lttng/lttng-kconsumerd.h> |
| 43 | #include <lttngerr.h> |
| 44 | |
| 45 | #include "channel.h" |
| 46 | #include "compat/poll.h" |
| 47 | #include "context.h" |
| 48 | #include "event.h" |
| 49 | #include "futex.h" |
| 50 | #include "kernel-ctl.h" |
| 51 | #include "ltt-sessiond.h" |
| 52 | #include "shm.h" |
| 53 | #include "traceable-app.h" |
| 54 | #include "ust-ctl.h" |
| 55 | #include "utils.h" |
| 56 | #include "ust-ctl.h" |
| 57 | |
| 58 | /* Const values */ |
| 59 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
| 60 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
| 61 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
| 62 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; |
| 63 | |
| 64 | /* Variables */ |
| 65 | int opt_verbose; /* Not static for lttngerr.h */ |
| 66 | int opt_verbose_kconsumerd; /* Not static for lttngerr.h */ |
| 67 | int opt_quiet; /* Not static for lttngerr.h */ |
| 68 | |
| 69 | const char *progname; |
| 70 | const char *opt_tracing_group; |
| 71 | static int opt_sig_parent; |
| 72 | static int opt_daemon; |
| 73 | static int is_root; /* Set to 1 if the daemon is running as root */ |
| 74 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
| 75 | static pid_t kconsumerd_pid; |
| 76 | static int dispatch_thread_exit; |
| 77 | |
| 78 | /* Global application Unix socket path */ |
| 79 | static char apps_unix_sock_path[PATH_MAX]; |
| 80 | /* Global client Unix socket path */ |
| 81 | static char client_unix_sock_path[PATH_MAX]; |
| 82 | /* kconsumerd error and command Unix socket path */ |
| 83 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; |
| 84 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; |
| 85 | /* global wait shm path for UST */ |
| 86 | static char wait_shm_path[PATH_MAX]; |
| 87 | |
| 88 | /* Sockets and FDs */ |
| 89 | static int client_sock; |
| 90 | static int apps_sock; |
| 91 | static int kconsumerd_err_sock; |
| 92 | static int kconsumerd_cmd_sock; |
| 93 | static int kernel_tracer_fd; |
| 94 | static int kernel_poll_pipe[2]; |
| 95 | |
| 96 | /* |
| 97 | * Quit pipe for all threads. This permits a single cancellation point |
| 98 | * for all threads when receiving an event on the pipe. |
| 99 | */ |
| 100 | static int thread_quit_pipe[2]; |
| 101 | |
| 102 | /* |
| 103 | * This pipe is used to inform the thread managing application communication |
| 104 | * that a command is queued and ready to be processed. |
| 105 | */ |
| 106 | static int apps_cmd_pipe[2]; |
| 107 | |
| 108 | /* Pthread, Mutexes and Semaphores */ |
| 109 | static pthread_t kconsumerd_thread; |
| 110 | static pthread_t apps_thread; |
| 111 | static pthread_t reg_apps_thread; |
| 112 | static pthread_t client_thread; |
| 113 | static pthread_t kernel_thread; |
| 114 | static pthread_t dispatch_thread; |
| 115 | static sem_t kconsumerd_sem; |
| 116 | |
| 117 | |
| 118 | /* Mutex to control kconsumerd pid assignation */ |
| 119 | static pthread_mutex_t kconsumerd_pid_mutex; |
| 120 | |
| 121 | /* |
| 122 | * UST registration command queue. This queue is tied with a futex and uses a N |
| 123 | * wakers / 1 waiter implemented and detailed in futex.c/.h |
| 124 | * |
| 125 | * The thread_manage_apps and thread_dispatch_ust_registration interact with |
| 126 | * this queue and the wait/wake scheme. |
| 127 | */ |
| 128 | static struct ust_cmd_queue ust_cmd_queue; |
| 129 | |
| 130 | /* |
| 131 | * Pointer initialized before thread creation. |
| 132 | * |
| 133 | * This points to the tracing session list containing the session count and a |
| 134 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock |
| 135 | * MUST NOT be taken if you call a public function in session.c. |
| 136 | * |
| 137 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
| 138 | * session_lock_list and session_unlock_list for lock acquisition. |
| 139 | */ |
| 140 | static struct ltt_session_list *session_list_ptr; |
| 141 | |
| 142 | /* |
| 143 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. |
| 144 | */ |
| 145 | static int create_thread_poll_set(struct lttng_poll_event *events, |
| 146 | unsigned int size) |
| 147 | { |
| 148 | int ret; |
| 149 | |
| 150 | if (events == NULL || size == 0) { |
| 151 | ret = -1; |
| 152 | goto error; |
| 153 | } |
| 154 | |
| 155 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); |
| 156 | if (ret < 0) { |
| 157 | goto error; |
| 158 | } |
| 159 | |
| 160 | /* Add quit pipe */ |
| 161 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); |
| 162 | if (ret < 0) { |
| 163 | goto error; |
| 164 | } |
| 165 | |
| 166 | return 0; |
| 167 | |
| 168 | error: |
| 169 | return ret; |
| 170 | } |
| 171 | |
| 172 | /* |
| 173 | * Check if the thread quit pipe was triggered. |
| 174 | * |
| 175 | * Return 1 if it was triggered else 0; |
| 176 | */ |
| 177 | static int check_thread_quit_pipe(int fd, uint32_t events) |
| 178 | { |
| 179 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
| 180 | return 1; |
| 181 | } |
| 182 | |
| 183 | return 0; |
| 184 | } |
| 185 | |
| 186 | /* |
| 187 | * Remove modules in reverse load order. |
| 188 | */ |
| 189 | static int modprobe_remove_kernel_modules(void) |
| 190 | { |
| 191 | int ret = 0, i; |
| 192 | char modprobe[256]; |
| 193 | |
| 194 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { |
| 195 | ret = snprintf(modprobe, sizeof(modprobe), |
| 196 | "/sbin/modprobe --remove --quiet %s", |
| 197 | kernel_modules_list[i].name); |
| 198 | if (ret < 0) { |
| 199 | perror("snprintf modprobe --remove"); |
| 200 | goto error; |
| 201 | } |
| 202 | modprobe[sizeof(modprobe) - 1] = '\0'; |
| 203 | ret = system(modprobe); |
| 204 | if (ret == -1) { |
| 205 | ERR("Unable to launch modprobe --remove for module %s", |
| 206 | kernel_modules_list[i].name); |
| 207 | } else if (kernel_modules_list[i].required |
| 208 | && WEXITSTATUS(ret) != 0) { |
| 209 | ERR("Unable to remove module %s", |
| 210 | kernel_modules_list[i].name); |
| 211 | } else { |
| 212 | DBG("Modprobe removal successful %s", |
| 213 | kernel_modules_list[i].name); |
| 214 | } |
| 215 | } |
| 216 | |
| 217 | error: |
| 218 | return ret; |
| 219 | } |
| 220 | |
| 221 | /* |
| 222 | * Return group ID of the tracing group or -1 if not found. |
| 223 | */ |
| 224 | static gid_t allowed_group(void) |
| 225 | { |
| 226 | struct group *grp; |
| 227 | |
| 228 | if (opt_tracing_group) { |
| 229 | grp = getgrnam(opt_tracing_group); |
| 230 | } else { |
| 231 | grp = getgrnam(default_tracing_group); |
| 232 | } |
| 233 | if (!grp) { |
| 234 | return -1; |
| 235 | } else { |
| 236 | return grp->gr_gid; |
| 237 | } |
| 238 | } |
| 239 | |
| 240 | /* |
| 241 | * Init thread quit pipe. |
| 242 | * |
| 243 | * Return -1 on error or 0 if all pipes are created. |
| 244 | */ |
| 245 | static int init_thread_quit_pipe(void) |
| 246 | { |
| 247 | int ret; |
| 248 | |
| 249 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); |
| 250 | if (ret < 0) { |
| 251 | perror("thread quit pipe"); |
| 252 | goto error; |
| 253 | } |
| 254 | |
| 255 | error: |
| 256 | return ret; |
| 257 | } |
| 258 | |
| 259 | /* |
| 260 | * Complete teardown of a kernel session. This free all data structure related |
| 261 | * to a kernel session and update counter. |
| 262 | */ |
| 263 | static void teardown_kernel_session(struct ltt_session *session) |
| 264 | { |
| 265 | if (session->kernel_session != NULL) { |
| 266 | DBG("Tearing down kernel session"); |
| 267 | |
| 268 | /* |
| 269 | * If a custom kernel consumer was registered, close the socket before |
| 270 | * tearing down the complete kernel session structure |
| 271 | */ |
| 272 | if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) { |
| 273 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); |
| 274 | } |
| 275 | |
| 276 | trace_kernel_destroy_session(session->kernel_session); |
| 277 | /* Extra precaution */ |
| 278 | session->kernel_session = NULL; |
| 279 | } |
| 280 | } |
| 281 | |
| 282 | /* |
| 283 | * Stop all threads by closing the thread quit pipe. |
| 284 | */ |
| 285 | static void stop_threads(void) |
| 286 | { |
| 287 | int ret; |
| 288 | |
| 289 | /* Stopping all threads */ |
| 290 | DBG("Terminating all threads"); |
| 291 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
| 292 | if (ret < 0) { |
| 293 | ERR("write error on thread quit pipe"); |
| 294 | } |
| 295 | |
| 296 | /* Dispatch thread */ |
| 297 | dispatch_thread_exit = 1; |
| 298 | futex_nto1_wake(&ust_cmd_queue.futex); |
| 299 | } |
| 300 | |
| 301 | /* |
| 302 | * Cleanup the daemon |
| 303 | */ |
| 304 | static void cleanup(void) |
| 305 | { |
| 306 | int ret; |
| 307 | char *cmd; |
| 308 | struct ltt_session *sess, *stmp; |
| 309 | |
| 310 | DBG("Cleaning up"); |
| 311 | |
| 312 | /* <fun> */ |
| 313 | MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm" |
| 314 | "Matthew, BEET driven development works!%c[%dm", |
| 315 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); |
| 316 | /* </fun> */ |
| 317 | |
| 318 | if (is_root) { |
| 319 | DBG("Removing %s directory", LTTNG_RUNDIR); |
| 320 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); |
| 321 | if (ret < 0) { |
| 322 | ERR("asprintf failed. Something is really wrong!"); |
| 323 | } |
| 324 | |
| 325 | /* Remove lttng run directory */ |
| 326 | ret = system(cmd); |
| 327 | if (ret < 0) { |
| 328 | ERR("Unable to clean " LTTNG_RUNDIR); |
| 329 | } |
| 330 | } |
| 331 | |
| 332 | DBG("Cleaning up all session"); |
| 333 | |
| 334 | /* Destroy session list mutex */ |
| 335 | if (session_list_ptr != NULL) { |
| 336 | pthread_mutex_destroy(&session_list_ptr->lock); |
| 337 | |
| 338 | /* Cleanup ALL session */ |
| 339 | cds_list_for_each_entry_safe(sess, stmp, |
| 340 | &session_list_ptr->head, list) { |
| 341 | teardown_kernel_session(sess); |
| 342 | // TODO complete session cleanup (including UST) |
| 343 | } |
| 344 | } |
| 345 | |
| 346 | DBG("Closing all UST sockets"); |
| 347 | clean_traceable_apps_list(); |
| 348 | |
| 349 | pthread_mutex_destroy(&kconsumerd_pid_mutex); |
| 350 | |
| 351 | DBG("Closing kernel fd"); |
| 352 | close(kernel_tracer_fd); |
| 353 | |
| 354 | if (is_root) { |
| 355 | DBG("Unloading kernel modules"); |
| 356 | modprobe_remove_kernel_modules(); |
| 357 | } |
| 358 | |
| 359 | close(thread_quit_pipe[0]); |
| 360 | close(thread_quit_pipe[1]); |
| 361 | } |
| 362 | |
| 363 | /* |
| 364 | * Send data on a unix socket using the liblttsessiondcomm API. |
| 365 | * |
| 366 | * Return lttcomm error code. |
| 367 | */ |
| 368 | static int send_unix_sock(int sock, void *buf, size_t len) |
| 369 | { |
| 370 | /* Check valid length */ |
| 371 | if (len <= 0) { |
| 372 | return -1; |
| 373 | } |
| 374 | |
| 375 | return lttcomm_send_unix_sock(sock, buf, len); |
| 376 | } |
| 377 | |
| 378 | /* |
| 379 | * Free memory of a command context structure. |
| 380 | */ |
| 381 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
| 382 | { |
| 383 | DBG("Clean command context structure"); |
| 384 | if (*cmd_ctx) { |
| 385 | if ((*cmd_ctx)->llm) { |
| 386 | free((*cmd_ctx)->llm); |
| 387 | } |
| 388 | if ((*cmd_ctx)->lsm) { |
| 389 | free((*cmd_ctx)->lsm); |
| 390 | } |
| 391 | free(*cmd_ctx); |
| 392 | *cmd_ctx = NULL; |
| 393 | } |
| 394 | } |
| 395 | |
| 396 | /* |
| 397 | * Send all stream fds of kernel channel to the consumer. |
| 398 | */ |
| 399 | static int send_kconsumerd_channel_fds(int sock, |
| 400 | struct ltt_kernel_channel *channel) |
| 401 | { |
| 402 | int ret; |
| 403 | size_t nb_fd; |
| 404 | struct ltt_kernel_stream *stream; |
| 405 | struct lttcomm_kconsumerd_header lkh; |
| 406 | struct lttcomm_kconsumerd_msg lkm; |
| 407 | |
| 408 | DBG("Sending fds of channel %s to kernel consumer", |
| 409 | channel->channel->name); |
| 410 | |
| 411 | nb_fd = channel->stream_count; |
| 412 | |
| 413 | /* Setup header */ |
| 414 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
| 415 | lkh.cmd_type = ADD_STREAM; |
| 416 | |
| 417 | DBG("Sending kconsumerd header"); |
| 418 | |
| 419 | ret = lttcomm_send_unix_sock(sock, &lkh, |
| 420 | sizeof(struct lttcomm_kconsumerd_header)); |
| 421 | if (ret < 0) { |
| 422 | perror("send kconsumerd header"); |
| 423 | goto error; |
| 424 | } |
| 425 | |
| 426 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
| 427 | if (stream->fd != 0) { |
| 428 | lkm.fd = stream->fd; |
| 429 | lkm.state = stream->state; |
| 430 | lkm.max_sb_size = channel->channel->attr.subbuf_size; |
| 431 | lkm.output = channel->channel->attr.output; |
| 432 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
| 433 | lkm.path_name[PATH_MAX - 1] = '\0'; |
| 434 | |
| 435 | DBG("Sending fd %d to kconsumerd", lkm.fd); |
| 436 | |
| 437 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, |
| 438 | &lkm.fd, 1, sizeof(lkm)); |
| 439 | if (ret < 0) { |
| 440 | perror("send kconsumerd fd"); |
| 441 | goto error; |
| 442 | } |
| 443 | } |
| 444 | } |
| 445 | |
| 446 | DBG("Kconsumerd channel fds sent"); |
| 447 | |
| 448 | return 0; |
| 449 | |
| 450 | error: |
| 451 | return ret; |
| 452 | } |
| 453 | |
| 454 | /* |
| 455 | * Send all stream fds of the kernel session to the consumer. |
| 456 | */ |
| 457 | static int send_kconsumerd_fds(struct ltt_kernel_session *session) |
| 458 | { |
| 459 | int ret; |
| 460 | struct ltt_kernel_channel *chan; |
| 461 | struct lttcomm_kconsumerd_header lkh; |
| 462 | struct lttcomm_kconsumerd_msg lkm; |
| 463 | |
| 464 | /* Setup header */ |
| 465 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); |
| 466 | lkh.cmd_type = ADD_STREAM; |
| 467 | |
| 468 | DBG("Sending kconsumerd header for metadata"); |
| 469 | |
| 470 | ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh, |
| 471 | sizeof(struct lttcomm_kconsumerd_header)); |
| 472 | if (ret < 0) { |
| 473 | perror("send kconsumerd header"); |
| 474 | goto error; |
| 475 | } |
| 476 | |
| 477 | DBG("Sending metadata stream fd"); |
| 478 | |
| 479 | /* Extra protection. It's NOT suppose to be set to 0 at this point */ |
| 480 | if (session->consumer_fd == 0) { |
| 481 | session->consumer_fd = kconsumerd_cmd_sock; |
| 482 | } |
| 483 | |
| 484 | if (session->metadata_stream_fd != 0) { |
| 485 | /* Send metadata stream fd first */ |
| 486 | lkm.fd = session->metadata_stream_fd; |
| 487 | lkm.state = ACTIVE_FD; |
| 488 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; |
| 489 | lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
| 490 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); |
| 491 | lkm.path_name[PATH_MAX - 1] = '\0'; |
| 492 | |
| 493 | ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm, |
| 494 | &lkm.fd, 1, sizeof(lkm)); |
| 495 | if (ret < 0) { |
| 496 | perror("send kconsumerd fd"); |
| 497 | goto error; |
| 498 | } |
| 499 | } |
| 500 | |
| 501 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
| 502 | ret = send_kconsumerd_channel_fds(session->consumer_fd, chan); |
| 503 | if (ret < 0) { |
| 504 | goto error; |
| 505 | } |
| 506 | } |
| 507 | |
| 508 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
| 509 | |
| 510 | return 0; |
| 511 | |
| 512 | error: |
| 513 | return ret; |
| 514 | } |
| 515 | |
| 516 | /* |
| 517 | * Notify UST applications using the shm mmap futex. |
| 518 | */ |
| 519 | static int notify_ust_apps(int active) |
| 520 | { |
| 521 | char *wait_shm_mmap; |
| 522 | |
| 523 | DBG("Notifying applications of session daemon state: %d", active); |
| 524 | |
| 525 | /* See shm.c for this call implying mmap, shm and futex calls */ |
| 526 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); |
| 527 | if (wait_shm_mmap == NULL) { |
| 528 | goto error; |
| 529 | } |
| 530 | |
| 531 | /* Wake waiting process */ |
| 532 | futex_wait_update((int32_t *) wait_shm_mmap, active); |
| 533 | |
| 534 | /* Apps notified successfully */ |
| 535 | return 0; |
| 536 | |
| 537 | error: |
| 538 | return -1; |
| 539 | } |
| 540 | |
| 541 | /* |
| 542 | * Setup the outgoing data buffer for the response (llm) by allocating the |
| 543 | * right amount of memory and copying the original information from the lsm |
| 544 | * structure. |
| 545 | * |
| 546 | * Return total size of the buffer pointed by buf. |
| 547 | */ |
| 548 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
| 549 | { |
| 550 | int ret, buf_size; |
| 551 | |
| 552 | buf_size = size; |
| 553 | |
| 554 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
| 555 | if (cmd_ctx->llm == NULL) { |
| 556 | perror("malloc"); |
| 557 | ret = -ENOMEM; |
| 558 | goto error; |
| 559 | } |
| 560 | |
| 561 | /* Copy common data */ |
| 562 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; |
| 563 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
| 564 | |
| 565 | cmd_ctx->llm->data_size = size; |
| 566 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; |
| 567 | |
| 568 | return buf_size; |
| 569 | |
| 570 | error: |
| 571 | return ret; |
| 572 | } |
| 573 | |
| 574 | /* |
| 575 | * Update the kernel poll set of all channel fd available over all tracing |
| 576 | * session. Add the wakeup pipe at the end of the set. |
| 577 | */ |
| 578 | static int update_kernel_poll(struct lttng_poll_event *events) |
| 579 | { |
| 580 | int ret; |
| 581 | struct ltt_session *session; |
| 582 | struct ltt_kernel_channel *channel; |
| 583 | |
| 584 | DBG("Updating kernel poll set"); |
| 585 | |
| 586 | session_lock_list(); |
| 587 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
| 588 | session_lock(session); |
| 589 | if (session->kernel_session == NULL) { |
| 590 | session_unlock(session); |
| 591 | continue; |
| 592 | } |
| 593 | |
| 594 | cds_list_for_each_entry(channel, |
| 595 | &session->kernel_session->channel_list.head, list) { |
| 596 | /* Add channel fd to the kernel poll set */ |
| 597 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); |
| 598 | if (ret < 0) { |
| 599 | session_unlock(session); |
| 600 | goto error; |
| 601 | } |
| 602 | DBG("Channel fd %d added to kernel set", channel->fd); |
| 603 | } |
| 604 | session_unlock(session); |
| 605 | } |
| 606 | session_unlock_list(); |
| 607 | |
| 608 | return 0; |
| 609 | |
| 610 | error: |
| 611 | session_unlock_list(); |
| 612 | return -1; |
| 613 | } |
| 614 | |
| 615 | /* |
| 616 | * Find the channel fd from 'fd' over all tracing session. When found, check |
| 617 | * for new channel stream and send those stream fds to the kernel consumer. |
| 618 | * |
| 619 | * Useful for CPU hotplug feature. |
| 620 | */ |
| 621 | static int update_kernel_stream(int fd) |
| 622 | { |
| 623 | int ret = 0; |
| 624 | struct ltt_session *session; |
| 625 | struct ltt_kernel_channel *channel; |
| 626 | |
| 627 | DBG("Updating kernel streams for channel fd %d", fd); |
| 628 | |
| 629 | session_lock_list(); |
| 630 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
| 631 | session_lock(session); |
| 632 | if (session->kernel_session == NULL) { |
| 633 | session_unlock(session); |
| 634 | continue; |
| 635 | } |
| 636 | |
| 637 | /* This is not suppose to be 0 but this is an extra security check */ |
| 638 | if (session->kernel_session->consumer_fd == 0) { |
| 639 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; |
| 640 | } |
| 641 | |
| 642 | cds_list_for_each_entry(channel, |
| 643 | &session->kernel_session->channel_list.head, list) { |
| 644 | if (channel->fd == fd) { |
| 645 | DBG("Channel found, updating kernel streams"); |
| 646 | ret = kernel_open_channel_stream(channel); |
| 647 | if (ret < 0) { |
| 648 | goto error; |
| 649 | } |
| 650 | |
| 651 | /* |
| 652 | * Have we already sent fds to the consumer? If yes, it means |
| 653 | * that tracing is started so it is safe to send our updated |
| 654 | * stream fds. |
| 655 | */ |
| 656 | if (session->kernel_session->kconsumer_fds_sent == 1) { |
| 657 | ret = send_kconsumerd_channel_fds( |
| 658 | session->kernel_session->consumer_fd, channel); |
| 659 | if (ret < 0) { |
| 660 | goto error; |
| 661 | } |
| 662 | } |
| 663 | goto error; |
| 664 | } |
| 665 | } |
| 666 | session_unlock(session); |
| 667 | } |
| 668 | session_unlock_list(); |
| 669 | return ret; |
| 670 | |
| 671 | error: |
| 672 | session_unlock(session); |
| 673 | session_unlock_list(); |
| 674 | return ret; |
| 675 | } |
| 676 | |
| 677 | /* |
| 678 | * This thread manage event coming from the kernel. |
| 679 | * |
| 680 | * Features supported in this thread: |
| 681 | * -) CPU Hotplug |
| 682 | */ |
| 683 | static void *thread_manage_kernel(void *data) |
| 684 | { |
| 685 | int ret, i, pollfd, update_poll_flag = 1; |
| 686 | uint32_t revents, nb_fd; |
| 687 | char tmp; |
| 688 | struct lttng_poll_event events; |
| 689 | |
| 690 | DBG("Thread manage kernel started"); |
| 691 | |
| 692 | ret = create_thread_poll_set(&events, 2); |
| 693 | if (ret < 0) { |
| 694 | goto error; |
| 695 | } |
| 696 | |
| 697 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); |
| 698 | if (ret < 0) { |
| 699 | goto error; |
| 700 | } |
| 701 | |
| 702 | while (1) { |
| 703 | if (update_poll_flag == 1) { |
| 704 | ret = update_kernel_poll(&events); |
| 705 | if (ret < 0) { |
| 706 | goto error; |
| 707 | } |
| 708 | update_poll_flag = 0; |
| 709 | } |
| 710 | |
| 711 | nb_fd = LTTNG_POLL_GETNB(&events); |
| 712 | |
| 713 | DBG("Thread kernel polling on %d fds", nb_fd); |
| 714 | |
| 715 | /* Zeroed the poll events */ |
| 716 | lttng_poll_reset(&events); |
| 717 | |
| 718 | /* Poll infinite value of time */ |
| 719 | ret = lttng_poll_wait(&events, -1); |
| 720 | if (ret < 0) { |
| 721 | goto error; |
| 722 | } else if (ret == 0) { |
| 723 | /* Should not happen since timeout is infinite */ |
| 724 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
| 725 | "This should not have happened! Continuing..."); |
| 726 | continue; |
| 727 | } |
| 728 | |
| 729 | for (i = 0; i < nb_fd; i++) { |
| 730 | /* Fetch once the poll data */ |
| 731 | revents = LTTNG_POLL_GETEV(&events, i); |
| 732 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 733 | |
| 734 | /* Thread quit pipe has been closed. Killing thread. */ |
| 735 | ret = check_thread_quit_pipe(pollfd, revents); |
| 736 | if (ret) { |
| 737 | goto error; |
| 738 | } |
| 739 | |
| 740 | /* Check for data on kernel pipe */ |
| 741 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { |
| 742 | ret = read(kernel_poll_pipe[0], &tmp, 1); |
| 743 | update_poll_flag = 1; |
| 744 | continue; |
| 745 | } else { |
| 746 | /* |
| 747 | * New CPU detected by the kernel. Adding kernel stream to |
| 748 | * kernel session and updating the kernel consumer |
| 749 | */ |
| 750 | if (revents & LPOLLIN) { |
| 751 | ret = update_kernel_stream(pollfd); |
| 752 | if (ret < 0) { |
| 753 | continue; |
| 754 | } |
| 755 | break; |
| 756 | /* |
| 757 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP |
| 758 | * and unregister kernel stream at this point. |
| 759 | */ |
| 760 | } |
| 761 | } |
| 762 | } |
| 763 | } |
| 764 | |
| 765 | error: |
| 766 | DBG("Kernel thread dying"); |
| 767 | close(kernel_poll_pipe[0]); |
| 768 | close(kernel_poll_pipe[1]); |
| 769 | |
| 770 | lttng_poll_clean(&events); |
| 771 | |
| 772 | return NULL; |
| 773 | } |
| 774 | |
| 775 | /* |
| 776 | * This thread manage the kconsumerd error sent back to the session daemon. |
| 777 | */ |
| 778 | static void *thread_manage_kconsumerd(void *data) |
| 779 | { |
| 780 | int sock = 0, i, ret, pollfd; |
| 781 | uint32_t revents, nb_fd; |
| 782 | enum lttcomm_return_code code; |
| 783 | struct lttng_poll_event events; |
| 784 | |
| 785 | DBG("[thread] Manage kconsumerd started"); |
| 786 | |
| 787 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); |
| 788 | if (ret < 0) { |
| 789 | goto error; |
| 790 | } |
| 791 | |
| 792 | /* |
| 793 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. |
| 794 | * Nothing more will be added to this poll set. |
| 795 | */ |
| 796 | ret = create_thread_poll_set(&events, 2); |
| 797 | if (ret < 0) { |
| 798 | goto error; |
| 799 | } |
| 800 | |
| 801 | ret = lttng_poll_add(&events, kconsumerd_err_sock, LPOLLIN | LPOLLRDHUP); |
| 802 | if (ret < 0) { |
| 803 | goto error; |
| 804 | } |
| 805 | |
| 806 | nb_fd = LTTNG_POLL_GETNB(&events); |
| 807 | |
| 808 | /* Inifinite blocking call, waiting for transmission */ |
| 809 | ret = lttng_poll_wait(&events, -1); |
| 810 | if (ret < 0) { |
| 811 | goto error; |
| 812 | } |
| 813 | |
| 814 | for (i = 0; i < nb_fd; i++) { |
| 815 | /* Fetch once the poll data */ |
| 816 | revents = LTTNG_POLL_GETEV(&events, i); |
| 817 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 818 | |
| 819 | /* Thread quit pipe has been closed. Killing thread. */ |
| 820 | ret = check_thread_quit_pipe(pollfd, revents); |
| 821 | if (ret) { |
| 822 | goto error; |
| 823 | } |
| 824 | |
| 825 | /* Event on the registration socket */ |
| 826 | if (pollfd == kconsumerd_err_sock) { |
| 827 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 828 | ERR("Kconsumerd err socket poll error"); |
| 829 | goto error; |
| 830 | } |
| 831 | } |
| 832 | } |
| 833 | |
| 834 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
| 835 | if (sock < 0) { |
| 836 | goto error; |
| 837 | } |
| 838 | |
| 839 | /* Getting status code from kconsumerd */ |
| 840 | ret = lttcomm_recv_unix_sock(sock, &code, |
| 841 | sizeof(enum lttcomm_return_code)); |
| 842 | if (ret <= 0) { |
| 843 | goto error; |
| 844 | } |
| 845 | |
| 846 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { |
| 847 | kconsumerd_cmd_sock = |
| 848 | lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); |
| 849 | if (kconsumerd_cmd_sock < 0) { |
| 850 | sem_post(&kconsumerd_sem); |
| 851 | perror("kconsumerd connect"); |
| 852 | goto error; |
| 853 | } |
| 854 | /* Signal condition to tell that the kconsumerd is ready */ |
| 855 | sem_post(&kconsumerd_sem); |
| 856 | DBG("Kconsumerd command socket ready"); |
| 857 | } else { |
| 858 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
| 859 | lttcomm_get_readable_code(-code)); |
| 860 | goto error; |
| 861 | } |
| 862 | |
| 863 | /* Remove the kconsumerd error sock since we've established a connexion */ |
| 864 | ret = lttng_poll_del(&events, kconsumerd_err_sock); |
| 865 | if (ret < 0) { |
| 866 | goto error; |
| 867 | } |
| 868 | |
| 869 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
| 870 | if (ret < 0) { |
| 871 | goto error; |
| 872 | } |
| 873 | |
| 874 | /* Update number of fd */ |
| 875 | nb_fd = LTTNG_POLL_GETNB(&events); |
| 876 | |
| 877 | /* Inifinite blocking call, waiting for transmission */ |
| 878 | ret = lttng_poll_wait(&events, -1); |
| 879 | if (ret < 0) { |
| 880 | goto error; |
| 881 | } |
| 882 | |
| 883 | for (i = 0; i < nb_fd; i++) { |
| 884 | /* Fetch once the poll data */ |
| 885 | revents = LTTNG_POLL_GETEV(&events, i); |
| 886 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 887 | |
| 888 | /* Thread quit pipe has been closed. Killing thread. */ |
| 889 | ret = check_thread_quit_pipe(pollfd, revents); |
| 890 | if (ret) { |
| 891 | goto error; |
| 892 | } |
| 893 | |
| 894 | /* Event on the kconsumerd socket */ |
| 895 | if (pollfd == sock) { |
| 896 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 897 | ERR("Kconsumerd err socket second poll error"); |
| 898 | goto error; |
| 899 | } |
| 900 | } |
| 901 | } |
| 902 | |
| 903 | /* Wait for any kconsumerd error */ |
| 904 | ret = lttcomm_recv_unix_sock(sock, &code, |
| 905 | sizeof(enum lttcomm_return_code)); |
| 906 | if (ret <= 0) { |
| 907 | ERR("Kconsumerd closed the command socket"); |
| 908 | goto error; |
| 909 | } |
| 910 | |
| 911 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
| 912 | |
| 913 | error: |
| 914 | DBG("Kconsumerd thread dying"); |
| 915 | close(kconsumerd_err_sock); |
| 916 | close(kconsumerd_cmd_sock); |
| 917 | close(sock); |
| 918 | |
| 919 | unlink(kconsumerd_err_unix_sock_path); |
| 920 | unlink(kconsumerd_cmd_unix_sock_path); |
| 921 | kconsumerd_pid = 0; |
| 922 | |
| 923 | lttng_poll_clean(&events); |
| 924 | |
| 925 | return NULL; |
| 926 | } |
| 927 | |
| 928 | /* |
| 929 | * This thread manage application communication. |
| 930 | */ |
| 931 | static void *thread_manage_apps(void *data) |
| 932 | { |
| 933 | int i, ret, pollfd; |
| 934 | uint32_t revents, nb_fd; |
| 935 | struct ust_command ust_cmd; |
| 936 | struct lttng_poll_event events; |
| 937 | |
| 938 | DBG("[thread] Manage application started"); |
| 939 | |
| 940 | ret = create_thread_poll_set(&events, 2); |
| 941 | if (ret < 0) { |
| 942 | goto error; |
| 943 | } |
| 944 | |
| 945 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
| 946 | if (ret < 0) { |
| 947 | goto error; |
| 948 | } |
| 949 | |
| 950 | while (1) { |
| 951 | /* Zeroed the events structure */ |
| 952 | lttng_poll_reset(&events); |
| 953 | |
| 954 | nb_fd = LTTNG_POLL_GETNB(&events); |
| 955 | |
| 956 | DBG("Apps thread polling on %d fds", nb_fd); |
| 957 | |
| 958 | /* Inifinite blocking call, waiting for transmission */ |
| 959 | ret = lttng_poll_wait(&events, -1); |
| 960 | if (ret < 0) { |
| 961 | goto error; |
| 962 | } |
| 963 | |
| 964 | for (i = 0; i < nb_fd; i++) { |
| 965 | /* Fetch once the poll data */ |
| 966 | revents = LTTNG_POLL_GETEV(&events, i); |
| 967 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 968 | |
| 969 | /* Thread quit pipe has been closed. Killing thread. */ |
| 970 | ret = check_thread_quit_pipe(pollfd, revents); |
| 971 | if (ret) { |
| 972 | goto error; |
| 973 | } |
| 974 | |
| 975 | /* Inspect the apps cmd pipe */ |
| 976 | if (pollfd == apps_cmd_pipe[0]) { |
| 977 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 978 | ERR("Apps command pipe error"); |
| 979 | goto error; |
| 980 | } else if (revents & LPOLLIN) { |
| 981 | /* Empty pipe */ |
| 982 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); |
| 983 | if (ret < 0 || ret < sizeof(ust_cmd)) { |
| 984 | perror("read apps cmd pipe"); |
| 985 | goto error; |
| 986 | } |
| 987 | |
| 988 | /* Register applicaton to the session daemon */ |
| 989 | ret = register_traceable_app(&ust_cmd.reg_msg, |
| 990 | ust_cmd.sock); |
| 991 | if (ret < 0) { |
| 992 | /* Only critical ENOMEM error can be returned here */ |
| 993 | goto error; |
| 994 | } |
| 995 | |
| 996 | ret = ustctl_register_done(ust_cmd.sock); |
| 997 | if (ret < 0) { |
| 998 | /* |
| 999 | * If the registration is not possible, we simply |
| 1000 | * unregister the apps and continue |
| 1001 | */ |
| 1002 | unregister_traceable_app(ust_cmd.sock); |
| 1003 | } else { |
| 1004 | /* |
| 1005 | * We just need here to monitor the close of the UST |
| 1006 | * socket and poll set monitor those by default. |
| 1007 | */ |
| 1008 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); |
| 1009 | if (ret < 0) { |
| 1010 | goto error; |
| 1011 | } |
| 1012 | |
| 1013 | DBG("Apps with sock %d added to poll set", |
| 1014 | ust_cmd.sock); |
| 1015 | } |
| 1016 | break; |
| 1017 | } |
| 1018 | } else { |
| 1019 | /* |
| 1020 | * At this point, we know that a registered application made |
| 1021 | * the event at poll_wait. |
| 1022 | */ |
| 1023 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 1024 | /* Removing from the poll set */ |
| 1025 | ret = lttng_poll_del(&events, pollfd); |
| 1026 | if (ret < 0) { |
| 1027 | goto error; |
| 1028 | } |
| 1029 | |
| 1030 | /* Socket closed */ |
| 1031 | unregister_traceable_app(pollfd); |
| 1032 | break; |
| 1033 | } |
| 1034 | } |
| 1035 | } |
| 1036 | } |
| 1037 | |
| 1038 | error: |
| 1039 | DBG("Application communication apps dying"); |
| 1040 | close(apps_cmd_pipe[0]); |
| 1041 | close(apps_cmd_pipe[1]); |
| 1042 | |
| 1043 | lttng_poll_clean(&events); |
| 1044 | |
| 1045 | return NULL; |
| 1046 | } |
| 1047 | |
| 1048 | /* |
| 1049 | * Dispatch request from the registration threads to the application |
| 1050 | * communication thread. |
| 1051 | */ |
| 1052 | static void *thread_dispatch_ust_registration(void *data) |
| 1053 | { |
| 1054 | int ret; |
| 1055 | struct cds_wfq_node *node; |
| 1056 | struct ust_command *ust_cmd = NULL; |
| 1057 | |
| 1058 | DBG("[thread] Dispatch UST command started"); |
| 1059 | |
| 1060 | while (!dispatch_thread_exit) { |
| 1061 | /* Atomically prepare the queue futex */ |
| 1062 | futex_nto1_prepare(&ust_cmd_queue.futex); |
| 1063 | |
| 1064 | do { |
| 1065 | /* Dequeue command for registration */ |
| 1066 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); |
| 1067 | if (node == NULL) { |
| 1068 | DBG("Waked up but nothing in the UST command queue"); |
| 1069 | /* Continue thread execution */ |
| 1070 | break; |
| 1071 | } |
| 1072 | |
| 1073 | ust_cmd = caa_container_of(node, struct ust_command, node); |
| 1074 | |
| 1075 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
| 1076 | " gid:%d sock:%d name:%s (version %d.%d)", |
| 1077 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, |
| 1078 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, |
| 1079 | ust_cmd->sock, ust_cmd->reg_msg.name, |
| 1080 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); |
| 1081 | /* |
| 1082 | * Inform apps thread of the new application registration. This |
| 1083 | * call is blocking so we can be assured that the data will be read |
| 1084 | * at some point in time or wait to the end of the world :) |
| 1085 | */ |
| 1086 | ret = write(apps_cmd_pipe[1], ust_cmd, |
| 1087 | sizeof(struct ust_command)); |
| 1088 | if (ret < 0) { |
| 1089 | perror("write apps cmd pipe"); |
| 1090 | if (errno == EBADF) { |
| 1091 | /* |
| 1092 | * We can't inform the application thread to process |
| 1093 | * registration. We will exit or else application |
| 1094 | * registration will not occur and tracing will never |
| 1095 | * start. |
| 1096 | */ |
| 1097 | goto error; |
| 1098 | } |
| 1099 | } |
| 1100 | free(ust_cmd); |
| 1101 | } while (node != NULL); |
| 1102 | |
| 1103 | /* Futex wait on queue. Blocking call on futex() */ |
| 1104 | futex_nto1_wait(&ust_cmd_queue.futex); |
| 1105 | } |
| 1106 | |
| 1107 | error: |
| 1108 | DBG("Dispatch thread dying"); |
| 1109 | return NULL; |
| 1110 | } |
| 1111 | |
| 1112 | /* |
| 1113 | * This thread manage application registration. |
| 1114 | */ |
| 1115 | static void *thread_registration_apps(void *data) |
| 1116 | { |
| 1117 | int sock = 0, i, ret, pollfd; |
| 1118 | uint32_t revents, nb_fd; |
| 1119 | struct lttng_poll_event events; |
| 1120 | /* |
| 1121 | * Get allocated in this thread, enqueued to a global queue, dequeued and |
| 1122 | * freed in the manage apps thread. |
| 1123 | */ |
| 1124 | struct ust_command *ust_cmd = NULL; |
| 1125 | |
| 1126 | DBG("[thread] Manage application registration started"); |
| 1127 | |
| 1128 | ret = lttcomm_listen_unix_sock(apps_sock); |
| 1129 | if (ret < 0) { |
| 1130 | goto error; |
| 1131 | } |
| 1132 | |
| 1133 | /* |
| 1134 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing |
| 1135 | * more will be added to this poll set. |
| 1136 | */ |
| 1137 | ret = create_thread_poll_set(&events, 2); |
| 1138 | if (ret < 0) { |
| 1139 | goto error; |
| 1140 | } |
| 1141 | |
| 1142 | /* Add the application registration socket */ |
| 1143 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); |
| 1144 | if (ret < 0) { |
| 1145 | goto error; |
| 1146 | } |
| 1147 | |
| 1148 | /* Notify all applications to register */ |
| 1149 | ret = notify_ust_apps(1); |
| 1150 | if (ret < 0) { |
| 1151 | ERR("Failed to notify applications or create the wait shared memory.\n" |
| 1152 | "Execution continues but there might be problem for already\n" |
| 1153 | "running applications that wishes to register."); |
| 1154 | } |
| 1155 | |
| 1156 | while (1) { |
| 1157 | DBG("Accepting application registration"); |
| 1158 | |
| 1159 | nb_fd = LTTNG_POLL_GETNB(&events); |
| 1160 | |
| 1161 | /* Inifinite blocking call, waiting for transmission */ |
| 1162 | ret = lttng_poll_wait(&events, -1); |
| 1163 | if (ret < 0) { |
| 1164 | goto error; |
| 1165 | } |
| 1166 | |
| 1167 | for (i = 0; i < nb_fd; i++) { |
| 1168 | /* Fetch once the poll data */ |
| 1169 | revents = LTTNG_POLL_GETEV(&events, i); |
| 1170 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 1171 | |
| 1172 | /* Thread quit pipe has been closed. Killing thread. */ |
| 1173 | ret = check_thread_quit_pipe(pollfd, revents); |
| 1174 | if (ret) { |
| 1175 | goto error; |
| 1176 | } |
| 1177 | |
| 1178 | /* Event on the registration socket */ |
| 1179 | if (pollfd == apps_sock) { |
| 1180 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 1181 | ERR("Register apps socket poll error"); |
| 1182 | goto error; |
| 1183 | } else if (revents & LPOLLIN) { |
| 1184 | sock = lttcomm_accept_unix_sock(apps_sock); |
| 1185 | if (sock < 0) { |
| 1186 | goto error; |
| 1187 | } |
| 1188 | |
| 1189 | /* Create UST registration command for enqueuing */ |
| 1190 | ust_cmd = malloc(sizeof(struct ust_command)); |
| 1191 | if (ust_cmd == NULL) { |
| 1192 | perror("ust command malloc"); |
| 1193 | goto error; |
| 1194 | } |
| 1195 | |
| 1196 | /* |
| 1197 | * Using message-based transmissions to ensure we don't |
| 1198 | * have to deal with partially received messages. |
| 1199 | */ |
| 1200 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
| 1201 | sizeof(struct ust_register_msg)); |
| 1202 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { |
| 1203 | if (ret < 0) { |
| 1204 | perror("lttcomm_recv_unix_sock register apps"); |
| 1205 | } else { |
| 1206 | ERR("Wrong size received on apps register"); |
| 1207 | } |
| 1208 | free(ust_cmd); |
| 1209 | close(sock); |
| 1210 | continue; |
| 1211 | } |
| 1212 | |
| 1213 | ust_cmd->sock = sock; |
| 1214 | |
| 1215 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
| 1216 | " gid:%d sock:%d name:%s (version %d.%d)", |
| 1217 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, |
| 1218 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, |
| 1219 | ust_cmd->sock, ust_cmd->reg_msg.name, |
| 1220 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); |
| 1221 | |
| 1222 | /* |
| 1223 | * Lock free enqueue the registration request. The red pill |
| 1224 | * has been taken! This apps will be part of the *system*. |
| 1225 | */ |
| 1226 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); |
| 1227 | |
| 1228 | /* |
| 1229 | * Wake the registration queue futex. Implicit memory |
| 1230 | * barrier with the exchange in cds_wfq_enqueue. |
| 1231 | */ |
| 1232 | futex_nto1_wake(&ust_cmd_queue.futex); |
| 1233 | } |
| 1234 | } |
| 1235 | } |
| 1236 | } |
| 1237 | |
| 1238 | error: |
| 1239 | DBG("UST Registration thread dying"); |
| 1240 | |
| 1241 | /* Notify that the registration thread is gone */ |
| 1242 | notify_ust_apps(0); |
| 1243 | |
| 1244 | close(apps_sock); |
| 1245 | close(sock); |
| 1246 | unlink(apps_unix_sock_path); |
| 1247 | |
| 1248 | lttng_poll_clean(&events); |
| 1249 | |
| 1250 | return NULL; |
| 1251 | } |
| 1252 | |
| 1253 | /* |
| 1254 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
| 1255 | * exec or it will fails. |
| 1256 | */ |
| 1257 | static int spawn_kconsumerd_thread(void) |
| 1258 | { |
| 1259 | int ret; |
| 1260 | |
| 1261 | /* Setup semaphore */ |
| 1262 | sem_init(&kconsumerd_sem, 0, 0); |
| 1263 | |
| 1264 | ret = pthread_create(&kconsumerd_thread, NULL, |
| 1265 | thread_manage_kconsumerd, (void *) NULL); |
| 1266 | if (ret != 0) { |
| 1267 | perror("pthread_create kconsumerd"); |
| 1268 | goto error; |
| 1269 | } |
| 1270 | |
| 1271 | /* Wait for the kconsumerd thread to be ready */ |
| 1272 | sem_wait(&kconsumerd_sem); |
| 1273 | |
| 1274 | if (kconsumerd_pid == 0) { |
| 1275 | ERR("Kconsumerd did not start"); |
| 1276 | goto error; |
| 1277 | } |
| 1278 | |
| 1279 | return 0; |
| 1280 | |
| 1281 | error: |
| 1282 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
| 1283 | return ret; |
| 1284 | } |
| 1285 | |
| 1286 | /* |
| 1287 | * Join kernel consumer thread |
| 1288 | */ |
| 1289 | static int join_kconsumerd_thread(void) |
| 1290 | { |
| 1291 | void *status; |
| 1292 | int ret; |
| 1293 | |
| 1294 | if (kconsumerd_pid != 0) { |
| 1295 | ret = kill(kconsumerd_pid, SIGTERM); |
| 1296 | if (ret) { |
| 1297 | ERR("Error killing kconsumerd"); |
| 1298 | return ret; |
| 1299 | } |
| 1300 | return pthread_join(kconsumerd_thread, &status); |
| 1301 | } else { |
| 1302 | return 0; |
| 1303 | } |
| 1304 | } |
| 1305 | |
| 1306 | /* |
| 1307 | * Fork and exec a kernel consumer daemon (kconsumerd). |
| 1308 | * |
| 1309 | * Return pid if successful else -1. |
| 1310 | */ |
| 1311 | static pid_t spawn_kconsumerd(void) |
| 1312 | { |
| 1313 | int ret; |
| 1314 | pid_t pid; |
| 1315 | const char *verbosity; |
| 1316 | |
| 1317 | DBG("Spawning kconsumerd"); |
| 1318 | |
| 1319 | pid = fork(); |
| 1320 | if (pid == 0) { |
| 1321 | /* |
| 1322 | * Exec kconsumerd. |
| 1323 | */ |
| 1324 | if (opt_verbose > 1 || opt_verbose_kconsumerd) { |
| 1325 | verbosity = "--verbose"; |
| 1326 | } else { |
| 1327 | verbosity = "--quiet"; |
| 1328 | } |
| 1329 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", |
| 1330 | "ltt-kconsumerd", verbosity, NULL); |
| 1331 | if (errno != 0) { |
| 1332 | perror("kernel start consumer exec"); |
| 1333 | } |
| 1334 | exit(EXIT_FAILURE); |
| 1335 | } else if (pid > 0) { |
| 1336 | ret = pid; |
| 1337 | goto error; |
| 1338 | } else { |
| 1339 | perror("kernel start consumer fork"); |
| 1340 | ret = -errno; |
| 1341 | goto error; |
| 1342 | } |
| 1343 | |
| 1344 | error: |
| 1345 | return ret; |
| 1346 | } |
| 1347 | |
| 1348 | /* |
| 1349 | * Spawn the kconsumerd daemon and session daemon thread. |
| 1350 | */ |
| 1351 | static int start_kconsumerd(void) |
| 1352 | { |
| 1353 | int ret; |
| 1354 | |
| 1355 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
| 1356 | if (kconsumerd_pid != 0) { |
| 1357 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
| 1358 | goto end; |
| 1359 | } |
| 1360 | |
| 1361 | ret = spawn_kconsumerd(); |
| 1362 | if (ret < 0) { |
| 1363 | ERR("Spawning kconsumerd failed"); |
| 1364 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
| 1365 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
| 1366 | goto error; |
| 1367 | } |
| 1368 | |
| 1369 | /* Setting up the global kconsumerd_pid */ |
| 1370 | kconsumerd_pid = ret; |
| 1371 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
| 1372 | |
| 1373 | DBG("Kconsumerd pid %d", ret); |
| 1374 | |
| 1375 | DBG("Spawning kconsumerd thread"); |
| 1376 | ret = spawn_kconsumerd_thread(); |
| 1377 | if (ret < 0) { |
| 1378 | ERR("Fatal error spawning kconsumerd thread"); |
| 1379 | goto error; |
| 1380 | } |
| 1381 | |
| 1382 | end: |
| 1383 | return 0; |
| 1384 | |
| 1385 | error: |
| 1386 | return ret; |
| 1387 | } |
| 1388 | |
| 1389 | /* |
| 1390 | * modprobe_kernel_modules |
| 1391 | */ |
| 1392 | static int modprobe_kernel_modules(void) |
| 1393 | { |
| 1394 | int ret = 0, i; |
| 1395 | char modprobe[256]; |
| 1396 | |
| 1397 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
| 1398 | ret = snprintf(modprobe, sizeof(modprobe), |
| 1399 | "/sbin/modprobe %s%s", |
| 1400 | kernel_modules_list[i].required ? "" : "--quiet ", |
| 1401 | kernel_modules_list[i].name); |
| 1402 | if (ret < 0) { |
| 1403 | perror("snprintf modprobe"); |
| 1404 | goto error; |
| 1405 | } |
| 1406 | modprobe[sizeof(modprobe) - 1] = '\0'; |
| 1407 | ret = system(modprobe); |
| 1408 | if (ret == -1) { |
| 1409 | ERR("Unable to launch modprobe for module %s", |
| 1410 | kernel_modules_list[i].name); |
| 1411 | } else if (kernel_modules_list[i].required |
| 1412 | && WEXITSTATUS(ret) != 0) { |
| 1413 | ERR("Unable to load module %s", |
| 1414 | kernel_modules_list[i].name); |
| 1415 | } else { |
| 1416 | DBG("Modprobe successfully %s", |
| 1417 | kernel_modules_list[i].name); |
| 1418 | } |
| 1419 | } |
| 1420 | |
| 1421 | error: |
| 1422 | return ret; |
| 1423 | } |
| 1424 | |
| 1425 | /* |
| 1426 | * mount_debugfs |
| 1427 | */ |
| 1428 | static int mount_debugfs(char *path) |
| 1429 | { |
| 1430 | int ret; |
| 1431 | char *type = "debugfs"; |
| 1432 | |
| 1433 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
| 1434 | if (ret < 0) { |
| 1435 | goto error; |
| 1436 | } |
| 1437 | |
| 1438 | ret = mount(type, path, type, 0, NULL); |
| 1439 | if (ret < 0) { |
| 1440 | perror("mount debugfs"); |
| 1441 | goto error; |
| 1442 | } |
| 1443 | |
| 1444 | DBG("Mounted debugfs successfully at %s", path); |
| 1445 | |
| 1446 | error: |
| 1447 | return ret; |
| 1448 | } |
| 1449 | |
| 1450 | /* |
| 1451 | * Setup necessary data for kernel tracer action. |
| 1452 | */ |
| 1453 | static void init_kernel_tracer(void) |
| 1454 | { |
| 1455 | int ret; |
| 1456 | char *proc_mounts = "/proc/mounts"; |
| 1457 | char line[256]; |
| 1458 | char *debugfs_path = NULL, *lttng_path = NULL; |
| 1459 | FILE *fp; |
| 1460 | |
| 1461 | /* Detect debugfs */ |
| 1462 | fp = fopen(proc_mounts, "r"); |
| 1463 | if (fp == NULL) { |
| 1464 | ERR("Unable to probe %s", proc_mounts); |
| 1465 | goto error; |
| 1466 | } |
| 1467 | |
| 1468 | while (fgets(line, sizeof(line), fp) != NULL) { |
| 1469 | if (strstr(line, "debugfs") != NULL) { |
| 1470 | /* Remove first string */ |
| 1471 | strtok(line, " "); |
| 1472 | /* Dup string here so we can reuse line later on */ |
| 1473 | debugfs_path = strdup(strtok(NULL, " ")); |
| 1474 | DBG("Got debugfs path : %s", debugfs_path); |
| 1475 | break; |
| 1476 | } |
| 1477 | } |
| 1478 | |
| 1479 | fclose(fp); |
| 1480 | |
| 1481 | /* Mount debugfs if needded */ |
| 1482 | if (debugfs_path == NULL) { |
| 1483 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); |
| 1484 | if (ret < 0) { |
| 1485 | perror("asprintf debugfs path"); |
| 1486 | goto error; |
| 1487 | } |
| 1488 | ret = mount_debugfs(debugfs_path); |
| 1489 | if (ret < 0) { |
| 1490 | goto error; |
| 1491 | } |
| 1492 | } |
| 1493 | |
| 1494 | /* Modprobe lttng kernel modules */ |
| 1495 | ret = modprobe_kernel_modules(); |
| 1496 | if (ret < 0) { |
| 1497 | goto error; |
| 1498 | } |
| 1499 | |
| 1500 | /* Setup lttng kernel path */ |
| 1501 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); |
| 1502 | if (ret < 0) { |
| 1503 | perror("asprintf lttng path"); |
| 1504 | goto error; |
| 1505 | } |
| 1506 | |
| 1507 | /* Open debugfs lttng */ |
| 1508 | kernel_tracer_fd = open(lttng_path, O_RDWR); |
| 1509 | if (kernel_tracer_fd < 0) { |
| 1510 | DBG("Failed to open %s", lttng_path); |
| 1511 | goto error; |
| 1512 | } |
| 1513 | |
| 1514 | free(lttng_path); |
| 1515 | free(debugfs_path); |
| 1516 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
| 1517 | return; |
| 1518 | |
| 1519 | error: |
| 1520 | if (lttng_path) { |
| 1521 | free(lttng_path); |
| 1522 | } |
| 1523 | if (debugfs_path) { |
| 1524 | free(debugfs_path); |
| 1525 | } |
| 1526 | WARN("No kernel tracer available"); |
| 1527 | kernel_tracer_fd = 0; |
| 1528 | return; |
| 1529 | } |
| 1530 | |
| 1531 | /* |
| 1532 | * Init tracing by creating trace directory and sending fds kernel consumer. |
| 1533 | */ |
| 1534 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
| 1535 | { |
| 1536 | int ret = 0; |
| 1537 | |
| 1538 | if (session->kconsumer_fds_sent == 0) { |
| 1539 | /* |
| 1540 | * Assign default kernel consumer socket if no consumer assigned to the |
| 1541 | * kernel session. At this point, it's NOT suppose to be 0 but this is |
| 1542 | * an extra security check. |
| 1543 | */ |
| 1544 | if (session->consumer_fd == 0) { |
| 1545 | session->consumer_fd = kconsumerd_cmd_sock; |
| 1546 | } |
| 1547 | |
| 1548 | ret = send_kconsumerd_fds(session); |
| 1549 | if (ret < 0) { |
| 1550 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
| 1551 | goto error; |
| 1552 | } |
| 1553 | |
| 1554 | session->kconsumer_fds_sent = 1; |
| 1555 | } |
| 1556 | |
| 1557 | error: |
| 1558 | return ret; |
| 1559 | } |
| 1560 | |
| 1561 | /* |
| 1562 | * Create an UST session and add it to the session ust list. |
| 1563 | */ |
| 1564 | static int create_ust_session(pid_t pid, struct ltt_session *session) |
| 1565 | { |
| 1566 | int ret = -1; |
| 1567 | struct ltt_ust_session *lus; |
| 1568 | |
| 1569 | DBG("Creating UST session"); |
| 1570 | |
| 1571 | lus = trace_ust_create_session(session->path, pid); |
| 1572 | if (lus == NULL) { |
| 1573 | goto error; |
| 1574 | } |
| 1575 | |
| 1576 | ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG, |
| 1577 | geteuid(), allowed_group()); |
| 1578 | if (ret < 0) { |
| 1579 | if (ret != -EEXIST) { |
| 1580 | ERR("Trace directory creation error"); |
| 1581 | goto error; |
| 1582 | } |
| 1583 | } |
| 1584 | |
| 1585 | /* Create session on the UST tracer */ |
| 1586 | ret = ustctl_create_session(lus); |
| 1587 | if (ret < 0) { |
| 1588 | goto error; |
| 1589 | } |
| 1590 | |
| 1591 | return 0; |
| 1592 | |
| 1593 | error: |
| 1594 | free(lus); |
| 1595 | return ret; |
| 1596 | } |
| 1597 | |
| 1598 | /* |
| 1599 | * Create a kernel tracer session then create the default channel. |
| 1600 | */ |
| 1601 | static int create_kernel_session(struct ltt_session *session) |
| 1602 | { |
| 1603 | int ret; |
| 1604 | |
| 1605 | DBG("Creating kernel session"); |
| 1606 | |
| 1607 | ret = kernel_create_session(session, kernel_tracer_fd); |
| 1608 | if (ret < 0) { |
| 1609 | ret = LTTCOMM_KERN_SESS_FAIL; |
| 1610 | goto error; |
| 1611 | } |
| 1612 | |
| 1613 | /* Set kernel consumer socket fd */ |
| 1614 | if (kconsumerd_cmd_sock) { |
| 1615 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; |
| 1616 | } |
| 1617 | |
| 1618 | ret = mkdir_recursive(session->kernel_session->trace_path, |
| 1619 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); |
| 1620 | if (ret < 0) { |
| 1621 | if (ret != -EEXIST) { |
| 1622 | ERR("Trace directory creation error"); |
| 1623 | goto error; |
| 1624 | } |
| 1625 | } |
| 1626 | |
| 1627 | error: |
| 1628 | return ret; |
| 1629 | } |
| 1630 | |
| 1631 | /* |
| 1632 | * Using the session list, filled a lttng_session array to send back to the |
| 1633 | * client for session listing. |
| 1634 | * |
| 1635 | * The session list lock MUST be acquired before calling this function. Use |
| 1636 | * session_lock_list() and session_unlock_list(). |
| 1637 | */ |
| 1638 | static void list_lttng_sessions(struct lttng_session *sessions) |
| 1639 | { |
| 1640 | int i = 0; |
| 1641 | struct ltt_session *session; |
| 1642 | |
| 1643 | DBG("Getting all available session"); |
| 1644 | /* |
| 1645 | * Iterate over session list and append data after the control struct in |
| 1646 | * the buffer. |
| 1647 | */ |
| 1648 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
| 1649 | strncpy(sessions[i].path, session->path, PATH_MAX); |
| 1650 | sessions[i].path[PATH_MAX - 1] = '\0'; |
| 1651 | strncpy(sessions[i].name, session->name, NAME_MAX); |
| 1652 | sessions[i].name[NAME_MAX - 1] = '\0'; |
| 1653 | i++; |
| 1654 | } |
| 1655 | } |
| 1656 | |
| 1657 | /* |
| 1658 | * Fill lttng_channel array of all channels. |
| 1659 | */ |
| 1660 | static void list_lttng_channels(struct ltt_session *session, |
| 1661 | struct lttng_channel *channels) |
| 1662 | { |
| 1663 | int i = 0; |
| 1664 | struct ltt_kernel_channel *kchan; |
| 1665 | |
| 1666 | DBG("Listing channels for session %s", session->name); |
| 1667 | |
| 1668 | /* Kernel channels */ |
| 1669 | if (session->kernel_session != NULL) { |
| 1670 | cds_list_for_each_entry(kchan, |
| 1671 | &session->kernel_session->channel_list.head, list) { |
| 1672 | /* Copy lttng_channel struct to array */ |
| 1673 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); |
| 1674 | channels[i].enabled = kchan->enabled; |
| 1675 | i++; |
| 1676 | } |
| 1677 | } |
| 1678 | |
| 1679 | /* TODO: Missing UST listing */ |
| 1680 | } |
| 1681 | |
| 1682 | /* |
| 1683 | * Fill lttng_event array of all events in the channel. |
| 1684 | */ |
| 1685 | static void list_lttng_events(struct ltt_kernel_channel *kchan, |
| 1686 | struct lttng_event *events) |
| 1687 | { |
| 1688 | /* |
| 1689 | * TODO: This is ONLY kernel. Need UST support. |
| 1690 | */ |
| 1691 | int i = 0; |
| 1692 | struct ltt_kernel_event *event; |
| 1693 | |
| 1694 | DBG("Listing events for channel %s", kchan->channel->name); |
| 1695 | |
| 1696 | /* Kernel channels */ |
| 1697 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { |
| 1698 | strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
| 1699 | events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
| 1700 | events[i].enabled = event->enabled; |
| 1701 | switch (event->event->instrumentation) { |
| 1702 | case LTTNG_KERNEL_TRACEPOINT: |
| 1703 | events[i].type = LTTNG_EVENT_TRACEPOINT; |
| 1704 | break; |
| 1705 | case LTTNG_KERNEL_KPROBE: |
| 1706 | case LTTNG_KERNEL_KRETPROBE: |
| 1707 | events[i].type = LTTNG_EVENT_PROBE; |
| 1708 | memcpy(&events[i].attr.probe, &event->event->u.kprobe, |
| 1709 | sizeof(struct lttng_kernel_kprobe)); |
| 1710 | break; |
| 1711 | case LTTNG_KERNEL_FUNCTION: |
| 1712 | events[i].type = LTTNG_EVENT_FUNCTION; |
| 1713 | memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, |
| 1714 | sizeof(struct lttng_kernel_function)); |
| 1715 | break; |
| 1716 | case LTTNG_KERNEL_NOOP: |
| 1717 | events[i].type = LTTNG_EVENT_NOOP; |
| 1718 | break; |
| 1719 | case LTTNG_KERNEL_SYSCALL: |
| 1720 | events[i].type = LTTNG_EVENT_SYSCALL; |
| 1721 | break; |
| 1722 | } |
| 1723 | i++; |
| 1724 | } |
| 1725 | } |
| 1726 | |
| 1727 | /* |
| 1728 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
| 1729 | */ |
| 1730 | static int cmd_disable_channel(struct ltt_session *session, |
| 1731 | int domain, char *channel_name) |
| 1732 | { |
| 1733 | int ret; |
| 1734 | |
| 1735 | switch (domain) { |
| 1736 | case LTTNG_DOMAIN_KERNEL: |
| 1737 | ret = channel_kernel_disable(session->kernel_session, |
| 1738 | channel_name); |
| 1739 | if (ret != LTTCOMM_OK) { |
| 1740 | goto error; |
| 1741 | } |
| 1742 | |
| 1743 | kernel_wait_quiescent(kernel_tracer_fd); |
| 1744 | break; |
| 1745 | default: |
| 1746 | /* TODO: Userspace tracing */ |
| 1747 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 1748 | goto error; |
| 1749 | } |
| 1750 | |
| 1751 | ret = LTTCOMM_OK; |
| 1752 | |
| 1753 | error: |
| 1754 | return ret; |
| 1755 | } |
| 1756 | |
| 1757 | /* |
| 1758 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. |
| 1759 | */ |
| 1760 | static int cmd_enable_channel(struct ltt_session *session, int domain, |
| 1761 | char *channel_name, struct lttng_channel *attr) |
| 1762 | { |
| 1763 | int ret; |
| 1764 | struct ltt_kernel_channel *kchan; |
| 1765 | |
| 1766 | switch (domain) { |
| 1767 | case LTTNG_DOMAIN_KERNEL: |
| 1768 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 1769 | session->kernel_session); |
| 1770 | if (kchan == NULL) { |
| 1771 | ret = channel_kernel_create(session->kernel_session, |
| 1772 | channel_name, attr, kernel_poll_pipe[1]); |
| 1773 | } else { |
| 1774 | ret = channel_kernel_enable(session->kernel_session, kchan); |
| 1775 | } |
| 1776 | |
| 1777 | if (ret != LTTCOMM_OK) { |
| 1778 | goto error; |
| 1779 | } |
| 1780 | |
| 1781 | kernel_wait_quiescent(kernel_tracer_fd); |
| 1782 | break; |
| 1783 | default: |
| 1784 | /* TODO: Userspace tracing */ |
| 1785 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 1786 | goto error; |
| 1787 | } |
| 1788 | |
| 1789 | ret = LTTCOMM_OK; |
| 1790 | |
| 1791 | error: |
| 1792 | return ret; |
| 1793 | } |
| 1794 | |
| 1795 | /* |
| 1796 | * Command LTTNG_DISABLE_EVENT processed by the client thread. |
| 1797 | */ |
| 1798 | static int cmd_disable_event(struct ltt_session *session, int domain, |
| 1799 | char *channel_name, char *event_name) |
| 1800 | { |
| 1801 | int ret; |
| 1802 | struct ltt_kernel_channel *kchan; |
| 1803 | |
| 1804 | switch (domain) { |
| 1805 | case LTTNG_DOMAIN_KERNEL: |
| 1806 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 1807 | session->kernel_session); |
| 1808 | if (kchan == NULL) { |
| 1809 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; |
| 1810 | goto error; |
| 1811 | } |
| 1812 | |
| 1813 | ret = event_kernel_disable(session->kernel_session, kchan, event_name); |
| 1814 | if (ret != LTTCOMM_OK) { |
| 1815 | goto error; |
| 1816 | } |
| 1817 | |
| 1818 | kernel_wait_quiescent(kernel_tracer_fd); |
| 1819 | break; |
| 1820 | default: |
| 1821 | /* TODO: Userspace tracing */ |
| 1822 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 1823 | goto error; |
| 1824 | } |
| 1825 | |
| 1826 | ret = LTTCOMM_OK; |
| 1827 | |
| 1828 | error: |
| 1829 | return ret; |
| 1830 | } |
| 1831 | |
| 1832 | /* |
| 1833 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. |
| 1834 | */ |
| 1835 | static int cmd_disable_event_all(struct ltt_session *session, int domain, |
| 1836 | char *channel_name) |
| 1837 | { |
| 1838 | int ret; |
| 1839 | struct ltt_kernel_channel *kchan; |
| 1840 | |
| 1841 | switch (domain) { |
| 1842 | case LTTNG_DOMAIN_KERNEL: |
| 1843 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 1844 | session->kernel_session); |
| 1845 | if (kchan == NULL) { |
| 1846 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; |
| 1847 | goto error; |
| 1848 | } |
| 1849 | |
| 1850 | ret = event_kernel_disable_all(session->kernel_session, kchan); |
| 1851 | if (ret != LTTCOMM_OK) { |
| 1852 | goto error; |
| 1853 | } |
| 1854 | |
| 1855 | kernel_wait_quiescent(kernel_tracer_fd); |
| 1856 | break; |
| 1857 | default: |
| 1858 | /* TODO: Userspace tracing */ |
| 1859 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 1860 | goto error; |
| 1861 | } |
| 1862 | |
| 1863 | ret = LTTCOMM_OK; |
| 1864 | |
| 1865 | error: |
| 1866 | return ret; |
| 1867 | } |
| 1868 | |
| 1869 | /* |
| 1870 | * Command LTTNG_ADD_CONTEXT processed by the client thread. |
| 1871 | */ |
| 1872 | static int cmd_add_context(struct ltt_session *session, int domain, |
| 1873 | char *channel_name, char *event_name, struct lttng_event_context *ctx) |
| 1874 | { |
| 1875 | int ret; |
| 1876 | |
| 1877 | switch (domain) { |
| 1878 | case LTTNG_DOMAIN_KERNEL: |
| 1879 | /* Add kernel context to kernel tracer */ |
| 1880 | ret = context_kernel_add(session->kernel_session, ctx, |
| 1881 | event_name, channel_name); |
| 1882 | if (ret != LTTCOMM_OK) { |
| 1883 | goto error; |
| 1884 | } |
| 1885 | |
| 1886 | break; |
| 1887 | default: |
| 1888 | /* TODO: Userspace tracing */ |
| 1889 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 1890 | goto error; |
| 1891 | } |
| 1892 | |
| 1893 | ret = LTTCOMM_OK; |
| 1894 | |
| 1895 | error: |
| 1896 | return ret; |
| 1897 | } |
| 1898 | |
| 1899 | /* |
| 1900 | * Command LTTNG_ENABLE_EVENT processed by the client thread. |
| 1901 | */ |
| 1902 | static int cmd_enable_event(struct ltt_session *session, int domain, |
| 1903 | char *channel_name, struct lttng_event *event) |
| 1904 | { |
| 1905 | int ret; |
| 1906 | struct ltt_kernel_channel *kchan; |
| 1907 | |
| 1908 | switch (domain) { |
| 1909 | case LTTNG_DOMAIN_KERNEL: |
| 1910 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 1911 | session->kernel_session); |
| 1912 | if (kchan == NULL) { |
| 1913 | /* This call will notify the kernel thread */ |
| 1914 | ret = channel_kernel_create(session->kernel_session, channel_name, |
| 1915 | NULL, kernel_poll_pipe[1]); |
| 1916 | if (ret != LTTCOMM_OK) { |
| 1917 | goto error; |
| 1918 | } |
| 1919 | } |
| 1920 | |
| 1921 | /* Get the newly created kernel channel pointer */ |
| 1922 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 1923 | session->kernel_session); |
| 1924 | if (kchan == NULL) { |
| 1925 | /* This sould not happen... */ |
| 1926 | ret = LTTCOMM_FATAL; |
| 1927 | goto error; |
| 1928 | } |
| 1929 | |
| 1930 | ret = event_kernel_enable(session->kernel_session, kchan, event); |
| 1931 | if (ret != LTTCOMM_OK) { |
| 1932 | goto error; |
| 1933 | } |
| 1934 | |
| 1935 | kernel_wait_quiescent(kernel_tracer_fd); |
| 1936 | break; |
| 1937 | default: |
| 1938 | /* TODO: Userspace tracing */ |
| 1939 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 1940 | goto error; |
| 1941 | } |
| 1942 | |
| 1943 | ret = LTTCOMM_OK; |
| 1944 | |
| 1945 | error: |
| 1946 | return ret; |
| 1947 | } |
| 1948 | |
| 1949 | /* |
| 1950 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. |
| 1951 | */ |
| 1952 | static int cmd_enable_event_all(struct ltt_session *session, int domain, |
| 1953 | char *channel_name, int event_type) |
| 1954 | { |
| 1955 | int ret; |
| 1956 | struct ltt_kernel_channel *kchan; |
| 1957 | |
| 1958 | switch (domain) { |
| 1959 | case LTTNG_DOMAIN_KERNEL: |
| 1960 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 1961 | session->kernel_session); |
| 1962 | if (kchan == NULL) { |
| 1963 | /* This call will notify the kernel thread */ |
| 1964 | ret = channel_kernel_create(session->kernel_session, channel_name, |
| 1965 | NULL, kernel_poll_pipe[1]); |
| 1966 | if (ret != LTTCOMM_OK) { |
| 1967 | goto error; |
| 1968 | } |
| 1969 | } |
| 1970 | |
| 1971 | /* Get the newly created kernel channel pointer */ |
| 1972 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 1973 | session->kernel_session); |
| 1974 | if (kchan == NULL) { |
| 1975 | /* This sould not happen... */ |
| 1976 | ret = LTTCOMM_FATAL; |
| 1977 | goto error; |
| 1978 | } |
| 1979 | |
| 1980 | if (event_type == LTTNG_KERNEL_SYSCALL) { |
| 1981 | ret = event_kernel_enable_syscalls(session->kernel_session, |
| 1982 | kchan, kernel_tracer_fd); |
| 1983 | } else { |
| 1984 | /* |
| 1985 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and events |
| 1986 | * already registered to the channel. |
| 1987 | */ |
| 1988 | ret = event_kernel_enable_all(session->kernel_session, |
| 1989 | kchan, kernel_tracer_fd); |
| 1990 | } |
| 1991 | |
| 1992 | if (ret != LTTCOMM_OK) { |
| 1993 | goto error; |
| 1994 | } |
| 1995 | |
| 1996 | kernel_wait_quiescent(kernel_tracer_fd); |
| 1997 | break; |
| 1998 | default: |
| 1999 | /* TODO: Userspace tracing */ |
| 2000 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2001 | goto error; |
| 2002 | } |
| 2003 | |
| 2004 | ret = LTTCOMM_OK; |
| 2005 | |
| 2006 | error: |
| 2007 | return ret; |
| 2008 | } |
| 2009 | |
| 2010 | /* |
| 2011 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. |
| 2012 | */ |
| 2013 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) |
| 2014 | { |
| 2015 | int ret; |
| 2016 | ssize_t nb_events = 0; |
| 2017 | |
| 2018 | switch (domain) { |
| 2019 | case LTTNG_DOMAIN_KERNEL: |
| 2020 | nb_events = kernel_list_events(kernel_tracer_fd, events); |
| 2021 | if (nb_events < 0) { |
| 2022 | ret = LTTCOMM_KERN_LIST_FAIL; |
| 2023 | goto error; |
| 2024 | } |
| 2025 | break; |
| 2026 | default: |
| 2027 | /* TODO: Userspace listing */ |
| 2028 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2029 | goto error; |
| 2030 | } |
| 2031 | |
| 2032 | return nb_events; |
| 2033 | |
| 2034 | error: |
| 2035 | /* Return negative value to differentiate return code */ |
| 2036 | return -ret; |
| 2037 | } |
| 2038 | |
| 2039 | /* |
| 2040 | * Command LTTNG_START_TRACE processed by the client thread. |
| 2041 | */ |
| 2042 | static int cmd_start_trace(struct ltt_session *session) |
| 2043 | { |
| 2044 | int ret; |
| 2045 | struct ltt_kernel_channel *kchan; |
| 2046 | struct ltt_kernel_session *ksession; |
| 2047 | |
| 2048 | /* Short cut */ |
| 2049 | ksession = session->kernel_session; |
| 2050 | |
| 2051 | /* Kernel tracing */ |
| 2052 | if (ksession != NULL) { |
| 2053 | /* Open kernel metadata */ |
| 2054 | if (ksession->metadata == NULL) { |
| 2055 | ret = kernel_open_metadata(ksession, ksession->trace_path); |
| 2056 | if (ret < 0) { |
| 2057 | ret = LTTCOMM_KERN_META_FAIL; |
| 2058 | goto error; |
| 2059 | } |
| 2060 | } |
| 2061 | |
| 2062 | /* Open kernel metadata stream */ |
| 2063 | if (ksession->metadata_stream_fd == 0) { |
| 2064 | ret = kernel_open_metadata_stream(ksession); |
| 2065 | if (ret < 0) { |
| 2066 | ERR("Kernel create metadata stream failed"); |
| 2067 | ret = LTTCOMM_KERN_STREAM_FAIL; |
| 2068 | goto error; |
| 2069 | } |
| 2070 | } |
| 2071 | |
| 2072 | /* For each channel */ |
| 2073 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
| 2074 | if (kchan->stream_count == 0) { |
| 2075 | ret = kernel_open_channel_stream(kchan); |
| 2076 | if (ret < 0) { |
| 2077 | ret = LTTCOMM_KERN_STREAM_FAIL; |
| 2078 | goto error; |
| 2079 | } |
| 2080 | /* Update the stream global counter */ |
| 2081 | ksession->stream_count_global += ret; |
| 2082 | } |
| 2083 | } |
| 2084 | |
| 2085 | /* Setup kernel consumer socket and send fds to it */ |
| 2086 | ret = init_kernel_tracing(ksession); |
| 2087 | if (ret < 0) { |
| 2088 | ret = LTTCOMM_KERN_START_FAIL; |
| 2089 | goto error; |
| 2090 | } |
| 2091 | |
| 2092 | /* This start the kernel tracing */ |
| 2093 | ret = kernel_start_session(ksession); |
| 2094 | if (ret < 0) { |
| 2095 | ret = LTTCOMM_KERN_START_FAIL; |
| 2096 | goto error; |
| 2097 | } |
| 2098 | |
| 2099 | /* Quiescent wait after starting trace */ |
| 2100 | kernel_wait_quiescent(kernel_tracer_fd); |
| 2101 | } |
| 2102 | |
| 2103 | /* TODO: Start all UST traces */ |
| 2104 | |
| 2105 | ret = LTTCOMM_OK; |
| 2106 | |
| 2107 | error: |
| 2108 | return ret; |
| 2109 | } |
| 2110 | |
| 2111 | /* |
| 2112 | * Command LTTNG_STOP_TRACE processed by the client thread. |
| 2113 | */ |
| 2114 | static int cmd_stop_trace(struct ltt_session *session) |
| 2115 | { |
| 2116 | int ret; |
| 2117 | struct ltt_kernel_channel *kchan; |
| 2118 | struct ltt_kernel_session *ksession; |
| 2119 | |
| 2120 | /* Short cut */ |
| 2121 | ksession = session->kernel_session; |
| 2122 | |
| 2123 | /* Kernel tracer */ |
| 2124 | if (ksession != NULL) { |
| 2125 | DBG("Stop kernel tracing"); |
| 2126 | |
| 2127 | /* Flush all buffers before stopping */ |
| 2128 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); |
| 2129 | if (ret < 0) { |
| 2130 | ERR("Kernel metadata flush failed"); |
| 2131 | } |
| 2132 | |
| 2133 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
| 2134 | ret = kernel_flush_buffer(kchan); |
| 2135 | if (ret < 0) { |
| 2136 | ERR("Kernel flush buffer error"); |
| 2137 | } |
| 2138 | } |
| 2139 | |
| 2140 | ret = kernel_stop_session(ksession); |
| 2141 | if (ret < 0) { |
| 2142 | ret = LTTCOMM_KERN_STOP_FAIL; |
| 2143 | goto error; |
| 2144 | } |
| 2145 | |
| 2146 | kernel_wait_quiescent(kernel_tracer_fd); |
| 2147 | } |
| 2148 | |
| 2149 | /* TODO : User-space tracer */ |
| 2150 | |
| 2151 | ret = LTTCOMM_OK; |
| 2152 | |
| 2153 | error: |
| 2154 | return ret; |
| 2155 | } |
| 2156 | |
| 2157 | /* |
| 2158 | * Command LTTNG_CREATE_SESSION processed by the client thread. |
| 2159 | */ |
| 2160 | static int cmd_create_session(char *name, char *path) |
| 2161 | { |
| 2162 | int ret; |
| 2163 | |
| 2164 | ret = session_create(name, path); |
| 2165 | if (ret != LTTCOMM_OK) { |
| 2166 | goto error; |
| 2167 | } |
| 2168 | |
| 2169 | ret = LTTCOMM_OK; |
| 2170 | |
| 2171 | error: |
| 2172 | return ret; |
| 2173 | } |
| 2174 | |
| 2175 | /* |
| 2176 | * Command LTTNG_DESTROY_SESSION processed by the client thread. |
| 2177 | */ |
| 2178 | static int cmd_destroy_session(struct ltt_session *session, char *name) |
| 2179 | { |
| 2180 | int ret; |
| 2181 | |
| 2182 | /* Clean kernel session teardown */ |
| 2183 | teardown_kernel_session(session); |
| 2184 | |
| 2185 | /* |
| 2186 | * Must notify the kernel thread here to update it's poll setin order |
| 2187 | * to remove the channel(s)' fd just destroyed. |
| 2188 | */ |
| 2189 | ret = notify_thread_pipe(kernel_poll_pipe[1]); |
| 2190 | if (ret < 0) { |
| 2191 | perror("write kernel poll pipe"); |
| 2192 | } |
| 2193 | |
| 2194 | ret = session_destroy(name); |
| 2195 | |
| 2196 | return ret; |
| 2197 | } |
| 2198 | |
| 2199 | /* |
| 2200 | * Command LTTNG_CALIBRATE processed by the client thread. |
| 2201 | */ |
| 2202 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) |
| 2203 | { |
| 2204 | int ret; |
| 2205 | |
| 2206 | switch (domain) { |
| 2207 | case LTTNG_DOMAIN_KERNEL: |
| 2208 | { |
| 2209 | struct lttng_kernel_calibrate kcalibrate; |
| 2210 | |
| 2211 | kcalibrate.type = calibrate->type; |
| 2212 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); |
| 2213 | if (ret < 0) { |
| 2214 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
| 2215 | goto error; |
| 2216 | } |
| 2217 | break; |
| 2218 | } |
| 2219 | default: |
| 2220 | /* TODO: Userspace tracing */ |
| 2221 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2222 | goto error; |
| 2223 | } |
| 2224 | |
| 2225 | ret = LTTCOMM_OK; |
| 2226 | |
| 2227 | error: |
| 2228 | return ret; |
| 2229 | } |
| 2230 | |
| 2231 | /* |
| 2232 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. |
| 2233 | */ |
| 2234 | static int cmd_register_consumer(struct ltt_session *session, int domain, |
| 2235 | char *sock_path) |
| 2236 | { |
| 2237 | int ret, sock; |
| 2238 | |
| 2239 | switch (domain) { |
| 2240 | case LTTNG_DOMAIN_KERNEL: |
| 2241 | /* Can't register a consumer if there is already one */ |
| 2242 | if (session->kernel_session->consumer_fd != 0) { |
| 2243 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
| 2244 | goto error; |
| 2245 | } |
| 2246 | |
| 2247 | sock = lttcomm_connect_unix_sock(sock_path); |
| 2248 | if (sock < 0) { |
| 2249 | ret = LTTCOMM_CONNECT_FAIL; |
| 2250 | goto error; |
| 2251 | } |
| 2252 | |
| 2253 | session->kernel_session->consumer_fd = sock; |
| 2254 | break; |
| 2255 | default: |
| 2256 | /* TODO: Userspace tracing */ |
| 2257 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2258 | goto error; |
| 2259 | } |
| 2260 | |
| 2261 | ret = LTTCOMM_OK; |
| 2262 | |
| 2263 | error: |
| 2264 | return ret; |
| 2265 | } |
| 2266 | |
| 2267 | /* |
| 2268 | * Command LTTNG_LIST_DOMAINS processed by the client thread. |
| 2269 | */ |
| 2270 | static ssize_t cmd_list_domains(struct ltt_session *session, |
| 2271 | struct lttng_domain **domains) |
| 2272 | { |
| 2273 | int ret; |
| 2274 | ssize_t nb_dom = 0; |
| 2275 | |
| 2276 | if (session->kernel_session != NULL) { |
| 2277 | nb_dom++; |
| 2278 | } |
| 2279 | |
| 2280 | nb_dom += session->ust_session_list.count; |
| 2281 | |
| 2282 | *domains = malloc(nb_dom * sizeof(struct lttng_domain)); |
| 2283 | if (*domains == NULL) { |
| 2284 | ret = -LTTCOMM_FATAL; |
| 2285 | goto error; |
| 2286 | } |
| 2287 | |
| 2288 | (*domains)[0].type = LTTNG_DOMAIN_KERNEL; |
| 2289 | |
| 2290 | /* TODO: User-space tracer domain support */ |
| 2291 | |
| 2292 | return nb_dom; |
| 2293 | |
| 2294 | error: |
| 2295 | return ret; |
| 2296 | } |
| 2297 | |
| 2298 | /* |
| 2299 | * Command LTTNG_LIST_CHANNELS processed by the client thread. |
| 2300 | */ |
| 2301 | static ssize_t cmd_list_channels(struct ltt_session *session, |
| 2302 | struct lttng_channel **channels) |
| 2303 | { |
| 2304 | int ret; |
| 2305 | ssize_t nb_chan = 0; |
| 2306 | |
| 2307 | if (session->kernel_session != NULL) { |
| 2308 | nb_chan += session->kernel_session->channel_count; |
| 2309 | } |
| 2310 | |
| 2311 | *channels = malloc(nb_chan * sizeof(struct lttng_channel)); |
| 2312 | if (*channels == NULL) { |
| 2313 | ret = -LTTCOMM_FATAL; |
| 2314 | goto error; |
| 2315 | } |
| 2316 | |
| 2317 | list_lttng_channels(session, *channels); |
| 2318 | |
| 2319 | return nb_chan; |
| 2320 | |
| 2321 | error: |
| 2322 | return ret; |
| 2323 | } |
| 2324 | |
| 2325 | /* |
| 2326 | * Command LTTNG_LIST_EVENTS processed by the client thread. |
| 2327 | */ |
| 2328 | static ssize_t cmd_list_events(struct ltt_session *session, |
| 2329 | char *channel_name, struct lttng_event **events) |
| 2330 | { |
| 2331 | int ret; |
| 2332 | ssize_t nb_event = 0; |
| 2333 | struct ltt_kernel_channel *kchan = NULL; |
| 2334 | |
| 2335 | if (session->kernel_session != NULL) { |
| 2336 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 2337 | session->kernel_session); |
| 2338 | if (kchan == NULL) { |
| 2339 | ret = -LTTCOMM_KERN_CHAN_NOT_FOUND; |
| 2340 | goto error; |
| 2341 | } |
| 2342 | nb_event += kchan->event_count; |
| 2343 | } |
| 2344 | |
| 2345 | *events = malloc(nb_event * sizeof(struct lttng_event)); |
| 2346 | if (*events == NULL) { |
| 2347 | ret = -LTTCOMM_FATAL; |
| 2348 | goto error; |
| 2349 | } |
| 2350 | |
| 2351 | list_lttng_events(kchan, *events); |
| 2352 | |
| 2353 | /* TODO: User-space tracer support */ |
| 2354 | |
| 2355 | return nb_event; |
| 2356 | |
| 2357 | error: |
| 2358 | return ret; |
| 2359 | } |
| 2360 | |
| 2361 | /* |
| 2362 | * Process the command requested by the lttng client within the command |
| 2363 | * context structure. This function make sure that the return structure (llm) |
| 2364 | * is set and ready for transmission before returning. |
| 2365 | * |
| 2366 | * Return any error encountered or 0 for success. |
| 2367 | */ |
| 2368 | static int process_client_msg(struct command_ctx *cmd_ctx) |
| 2369 | { |
| 2370 | int ret = LTTCOMM_OK; |
| 2371 | int need_kernel_session = 1; |
| 2372 | |
| 2373 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
| 2374 | |
| 2375 | /* |
| 2376 | * Check for command that don't needs to allocate a returned payload. We do |
| 2377 | * this here so we don't have to make the call for no payload" at each |
| 2378 | * command. |
| 2379 | */ |
| 2380 | switch(cmd_ctx->lsm->cmd_type) { |
| 2381 | case LTTNG_LIST_SESSIONS: |
| 2382 | case LTTNG_LIST_TRACEPOINTS: |
| 2383 | case LTTNG_LIST_DOMAINS: |
| 2384 | case LTTNG_LIST_CHANNELS: |
| 2385 | case LTTNG_LIST_EVENTS: |
| 2386 | break; |
| 2387 | default: |
| 2388 | /* Setup lttng message with no payload */ |
| 2389 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 2390 | if (ret < 0) { |
| 2391 | /* This label does not try to unlock the session */ |
| 2392 | goto init_setup_error; |
| 2393 | } |
| 2394 | } |
| 2395 | |
| 2396 | /* Commands that DO NOT need a session. */ |
| 2397 | switch (cmd_ctx->lsm->cmd_type) { |
| 2398 | case LTTNG_CALIBRATE: |
| 2399 | case LTTNG_CREATE_SESSION: |
| 2400 | case LTTNG_LIST_SESSIONS: |
| 2401 | case LTTNG_LIST_TRACEPOINTS: |
| 2402 | need_kernel_session = 0; |
| 2403 | break; |
| 2404 | default: |
| 2405 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); |
| 2406 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
| 2407 | if (cmd_ctx->session == NULL) { |
| 2408 | if (cmd_ctx->lsm->session.name != NULL) { |
| 2409 | ret = LTTCOMM_SESS_NOT_FOUND; |
| 2410 | } else { |
| 2411 | /* If no session name specified */ |
| 2412 | ret = LTTCOMM_SELECT_SESS; |
| 2413 | } |
| 2414 | goto error; |
| 2415 | } else { |
| 2416 | /* Acquire lock for the session */ |
| 2417 | session_lock(cmd_ctx->session); |
| 2418 | } |
| 2419 | break; |
| 2420 | } |
| 2421 | |
| 2422 | /* |
| 2423 | * Check domain type for specific "pre-action". |
| 2424 | */ |
| 2425 | switch (cmd_ctx->lsm->domain.type) { |
| 2426 | case LTTNG_DOMAIN_KERNEL: |
| 2427 | /* Kernel tracer check */ |
| 2428 | if (kernel_tracer_fd == 0) { |
| 2429 | /* Basically, load kernel tracer modules */ |
| 2430 | init_kernel_tracer(); |
| 2431 | if (kernel_tracer_fd == 0) { |
| 2432 | ret = LTTCOMM_KERN_NA; |
| 2433 | goto error; |
| 2434 | } |
| 2435 | } |
| 2436 | |
| 2437 | /* Need a session for kernel command */ |
| 2438 | if (need_kernel_session) { |
| 2439 | if (cmd_ctx->session->kernel_session == NULL) { |
| 2440 | ret = create_kernel_session(cmd_ctx->session); |
| 2441 | if (ret < 0) { |
| 2442 | ret = LTTCOMM_KERN_SESS_FAIL; |
| 2443 | goto error; |
| 2444 | } |
| 2445 | } |
| 2446 | |
| 2447 | /* Start the kernel consumer daemon */ |
| 2448 | if (kconsumerd_pid == 0 && |
| 2449 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
| 2450 | ret = start_kconsumerd(); |
| 2451 | if (ret < 0) { |
| 2452 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
| 2453 | goto error; |
| 2454 | } |
| 2455 | } |
| 2456 | } |
| 2457 | break; |
| 2458 | default: |
| 2459 | /* TODO Userspace tracer */ |
| 2460 | break; |
| 2461 | } |
| 2462 | |
| 2463 | /* Process by command type */ |
| 2464 | switch (cmd_ctx->lsm->cmd_type) { |
| 2465 | case LTTNG_ADD_CONTEXT: |
| 2466 | { |
| 2467 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 2468 | cmd_ctx->lsm->u.context.channel_name, |
| 2469 | cmd_ctx->lsm->u.context.event_name, |
| 2470 | &cmd_ctx->lsm->u.context.ctx); |
| 2471 | break; |
| 2472 | } |
| 2473 | case LTTNG_DISABLE_CHANNEL: |
| 2474 | { |
| 2475 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 2476 | cmd_ctx->lsm->u.disable.channel_name); |
| 2477 | break; |
| 2478 | } |
| 2479 | case LTTNG_DISABLE_EVENT: |
| 2480 | { |
| 2481 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 2482 | cmd_ctx->lsm->u.disable.channel_name, |
| 2483 | cmd_ctx->lsm->u.disable.name); |
| 2484 | ret = LTTCOMM_OK; |
| 2485 | break; |
| 2486 | } |
| 2487 | case LTTNG_DISABLE_ALL_EVENT: |
| 2488 | { |
| 2489 | DBG("Disabling all kernel event"); |
| 2490 | |
| 2491 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 2492 | cmd_ctx->lsm->u.disable.channel_name); |
| 2493 | break; |
| 2494 | } |
| 2495 | case LTTNG_ENABLE_CHANNEL: |
| 2496 | { |
| 2497 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 2498 | cmd_ctx->lsm->u.enable.channel_name, |
| 2499 | &cmd_ctx->lsm->u.channel.chan); |
| 2500 | break; |
| 2501 | } |
| 2502 | case LTTNG_ENABLE_EVENT: |
| 2503 | { |
| 2504 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 2505 | cmd_ctx->lsm->u.enable.channel_name, |
| 2506 | &cmd_ctx->lsm->u.enable.event); |
| 2507 | break; |
| 2508 | } |
| 2509 | case LTTNG_ENABLE_ALL_EVENT: |
| 2510 | { |
| 2511 | DBG("Enabling all kernel event"); |
| 2512 | |
| 2513 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 2514 | cmd_ctx->lsm->u.enable.channel_name, |
| 2515 | cmd_ctx->lsm->u.enable.event.type); |
| 2516 | break; |
| 2517 | } |
| 2518 | case LTTNG_LIST_TRACEPOINTS: |
| 2519 | { |
| 2520 | struct lttng_event *events; |
| 2521 | ssize_t nb_events; |
| 2522 | |
| 2523 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
| 2524 | if (nb_events < 0) { |
| 2525 | ret = -nb_events; |
| 2526 | goto error; |
| 2527 | } |
| 2528 | |
| 2529 | /* |
| 2530 | * Setup lttng message with payload size set to the event list size in |
| 2531 | * bytes and then copy list into the llm payload. |
| 2532 | */ |
| 2533 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
| 2534 | if (ret < 0) { |
| 2535 | free(events); |
| 2536 | goto setup_error; |
| 2537 | } |
| 2538 | |
| 2539 | /* Copy event list into message payload */ |
| 2540 | memcpy(cmd_ctx->llm->payload, events, |
| 2541 | sizeof(struct lttng_event) * nb_events); |
| 2542 | |
| 2543 | free(events); |
| 2544 | |
| 2545 | ret = LTTCOMM_OK; |
| 2546 | break; |
| 2547 | } |
| 2548 | case LTTNG_START_TRACE: |
| 2549 | { |
| 2550 | ret = cmd_start_trace(cmd_ctx->session); |
| 2551 | break; |
| 2552 | } |
| 2553 | case LTTNG_STOP_TRACE: |
| 2554 | { |
| 2555 | ret = cmd_stop_trace(cmd_ctx->session); |
| 2556 | break; |
| 2557 | } |
| 2558 | case LTTNG_CREATE_SESSION: |
| 2559 | { |
| 2560 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
| 2561 | cmd_ctx->lsm->session.path); |
| 2562 | break; |
| 2563 | } |
| 2564 | case LTTNG_DESTROY_SESSION: |
| 2565 | { |
| 2566 | ret = cmd_destroy_session(cmd_ctx->session, |
| 2567 | cmd_ctx->lsm->session.name); |
| 2568 | break; |
| 2569 | } |
| 2570 | case LTTNG_LIST_DOMAINS: |
| 2571 | { |
| 2572 | ssize_t nb_dom; |
| 2573 | struct lttng_domain *domains; |
| 2574 | |
| 2575 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
| 2576 | if (nb_dom < 0) { |
| 2577 | ret = -nb_dom; |
| 2578 | goto error; |
| 2579 | } |
| 2580 | |
| 2581 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
| 2582 | if (ret < 0) { |
| 2583 | goto setup_error; |
| 2584 | } |
| 2585 | |
| 2586 | /* Copy event list into message payload */ |
| 2587 | memcpy(cmd_ctx->llm->payload, domains, |
| 2588 | nb_dom * sizeof(struct lttng_domain)); |
| 2589 | |
| 2590 | free(domains); |
| 2591 | |
| 2592 | ret = LTTCOMM_OK; |
| 2593 | break; |
| 2594 | } |
| 2595 | case LTTNG_LIST_CHANNELS: |
| 2596 | { |
| 2597 | size_t nb_chan; |
| 2598 | struct lttng_channel *channels; |
| 2599 | |
| 2600 | nb_chan = cmd_list_channels(cmd_ctx->session, &channels); |
| 2601 | if (nb_chan < 0) { |
| 2602 | ret = -nb_chan; |
| 2603 | goto error; |
| 2604 | } |
| 2605 | |
| 2606 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
| 2607 | if (ret < 0) { |
| 2608 | goto setup_error; |
| 2609 | } |
| 2610 | |
| 2611 | /* Copy event list into message payload */ |
| 2612 | memcpy(cmd_ctx->llm->payload, channels, |
| 2613 | nb_chan * sizeof(struct lttng_channel)); |
| 2614 | |
| 2615 | free(channels); |
| 2616 | |
| 2617 | ret = LTTCOMM_OK; |
| 2618 | break; |
| 2619 | } |
| 2620 | case LTTNG_LIST_EVENTS: |
| 2621 | { |
| 2622 | size_t nb_event; |
| 2623 | struct lttng_event *events = NULL; |
| 2624 | |
| 2625 | nb_event = cmd_list_events(cmd_ctx->session, |
| 2626 | cmd_ctx->lsm->u.list.channel_name, &events); |
| 2627 | if (nb_event < 0) { |
| 2628 | ret = -nb_event; |
| 2629 | goto error; |
| 2630 | } |
| 2631 | |
| 2632 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
| 2633 | if (ret < 0) { |
| 2634 | goto setup_error; |
| 2635 | } |
| 2636 | |
| 2637 | /* Copy event list into message payload */ |
| 2638 | memcpy(cmd_ctx->llm->payload, events, |
| 2639 | nb_event * sizeof(struct lttng_event)); |
| 2640 | |
| 2641 | free(events); |
| 2642 | |
| 2643 | ret = LTTCOMM_OK; |
| 2644 | break; |
| 2645 | } |
| 2646 | case LTTNG_LIST_SESSIONS: |
| 2647 | { |
| 2648 | session_lock_list(); |
| 2649 | |
| 2650 | if (session_list_ptr->count == 0) { |
| 2651 | ret = LTTCOMM_NO_SESSION; |
| 2652 | session_unlock_list(); |
| 2653 | goto error; |
| 2654 | } |
| 2655 | |
| 2656 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
| 2657 | session_list_ptr->count); |
| 2658 | if (ret < 0) { |
| 2659 | session_unlock_list(); |
| 2660 | goto setup_error; |
| 2661 | } |
| 2662 | |
| 2663 | /* Filled the session array */ |
| 2664 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); |
| 2665 | |
| 2666 | session_unlock_list(); |
| 2667 | |
| 2668 | ret = LTTCOMM_OK; |
| 2669 | break; |
| 2670 | } |
| 2671 | case LTTNG_CALIBRATE: |
| 2672 | { |
| 2673 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
| 2674 | &cmd_ctx->lsm->u.calibrate); |
| 2675 | break; |
| 2676 | } |
| 2677 | case LTTNG_REGISTER_CONSUMER: |
| 2678 | { |
| 2679 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 2680 | cmd_ctx->lsm->u.reg.path); |
| 2681 | break; |
| 2682 | } |
| 2683 | default: |
| 2684 | ret = LTTCOMM_UND; |
| 2685 | break; |
| 2686 | } |
| 2687 | |
| 2688 | error: |
| 2689 | if (cmd_ctx->llm == NULL) { |
| 2690 | DBG("Missing llm structure. Allocating one."); |
| 2691 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
| 2692 | goto setup_error; |
| 2693 | } |
| 2694 | } |
| 2695 | /* Set return code */ |
| 2696 | cmd_ctx->llm->ret_code = ret; |
| 2697 | setup_error: |
| 2698 | if (cmd_ctx->session) { |
| 2699 | session_unlock(cmd_ctx->session); |
| 2700 | } |
| 2701 | init_setup_error: |
| 2702 | return ret; |
| 2703 | } |
| 2704 | |
| 2705 | /* |
| 2706 | * This thread manage all clients request using the unix client socket for |
| 2707 | * communication. |
| 2708 | */ |
| 2709 | static void *thread_manage_clients(void *data) |
| 2710 | { |
| 2711 | int sock = 0, ret, i, pollfd; |
| 2712 | uint32_t revents, nb_fd; |
| 2713 | struct command_ctx *cmd_ctx = NULL; |
| 2714 | struct lttng_poll_event events; |
| 2715 | |
| 2716 | DBG("[thread] Manage client started"); |
| 2717 | |
| 2718 | ret = lttcomm_listen_unix_sock(client_sock); |
| 2719 | if (ret < 0) { |
| 2720 | goto error; |
| 2721 | } |
| 2722 | |
| 2723 | /* |
| 2724 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing |
| 2725 | * more will be added to this poll set. |
| 2726 | */ |
| 2727 | ret = create_thread_poll_set(&events, 2); |
| 2728 | if (ret < 0) { |
| 2729 | goto error; |
| 2730 | } |
| 2731 | |
| 2732 | /* Add the application registration socket */ |
| 2733 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); |
| 2734 | if (ret < 0) { |
| 2735 | goto error; |
| 2736 | } |
| 2737 | |
| 2738 | /* |
| 2739 | * Notify parent pid that we are ready to accept command for client side. |
| 2740 | */ |
| 2741 | if (opt_sig_parent) { |
| 2742 | kill(ppid, SIGCHLD); |
| 2743 | } |
| 2744 | |
| 2745 | while (1) { |
| 2746 | DBG("Accepting client command ..."); |
| 2747 | |
| 2748 | nb_fd = LTTNG_POLL_GETNB(&events); |
| 2749 | |
| 2750 | /* Inifinite blocking call, waiting for transmission */ |
| 2751 | ret = lttng_poll_wait(&events, -1); |
| 2752 | if (ret < 0) { |
| 2753 | goto error; |
| 2754 | } |
| 2755 | |
| 2756 | for (i = 0; i < nb_fd; i++) { |
| 2757 | /* Fetch once the poll data */ |
| 2758 | revents = LTTNG_POLL_GETEV(&events, i); |
| 2759 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 2760 | |
| 2761 | /* Thread quit pipe has been closed. Killing thread. */ |
| 2762 | ret = check_thread_quit_pipe(pollfd, revents); |
| 2763 | if (ret) { |
| 2764 | goto error; |
| 2765 | } |
| 2766 | |
| 2767 | /* Event on the registration socket */ |
| 2768 | if (pollfd == client_sock) { |
| 2769 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 2770 | ERR("Client socket poll error"); |
| 2771 | goto error; |
| 2772 | } |
| 2773 | } |
| 2774 | } |
| 2775 | |
| 2776 | DBG("Wait for client response"); |
| 2777 | |
| 2778 | sock = lttcomm_accept_unix_sock(client_sock); |
| 2779 | if (sock < 0) { |
| 2780 | goto error; |
| 2781 | } |
| 2782 | |
| 2783 | /* Allocate context command to process the client request */ |
| 2784 | cmd_ctx = malloc(sizeof(struct command_ctx)); |
| 2785 | if (cmd_ctx == NULL) { |
| 2786 | perror("malloc cmd_ctx"); |
| 2787 | goto error; |
| 2788 | } |
| 2789 | |
| 2790 | /* Allocate data buffer for reception */ |
| 2791 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); |
| 2792 | if (cmd_ctx->lsm == NULL) { |
| 2793 | perror("malloc cmd_ctx->lsm"); |
| 2794 | goto error; |
| 2795 | } |
| 2796 | |
| 2797 | cmd_ctx->llm = NULL; |
| 2798 | cmd_ctx->session = NULL; |
| 2799 | |
| 2800 | /* |
| 2801 | * Data is received from the lttng client. The struct |
| 2802 | * lttcomm_session_msg (lsm) contains the command and data request of |
| 2803 | * the client. |
| 2804 | */ |
| 2805 | DBG("Receiving data from client ..."); |
| 2806 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, |
| 2807 | sizeof(struct lttcomm_session_msg)); |
| 2808 | if (ret <= 0) { |
| 2809 | DBG("Nothing recv() from client... continuing"); |
| 2810 | close(sock); |
| 2811 | free(cmd_ctx); |
| 2812 | continue; |
| 2813 | } |
| 2814 | |
| 2815 | // TODO: Validate cmd_ctx including sanity check for |
| 2816 | // security purpose. |
| 2817 | |
| 2818 | /* |
| 2819 | * This function dispatch the work to the kernel or userspace tracer |
| 2820 | * libs and fill the lttcomm_lttng_msg data structure of all the needed |
| 2821 | * informations for the client. The command context struct contains |
| 2822 | * everything this function may needs. |
| 2823 | */ |
| 2824 | ret = process_client_msg(cmd_ctx); |
| 2825 | if (ret < 0) { |
| 2826 | /* |
| 2827 | * TODO: Inform client somehow of the fatal error. At |
| 2828 | * this point, ret < 0 means that a malloc failed |
| 2829 | * (ENOMEM). Error detected but still accept command. |
| 2830 | */ |
| 2831 | clean_command_ctx(&cmd_ctx); |
| 2832 | continue; |
| 2833 | } |
| 2834 | |
| 2835 | DBG("Sending response (size: %d, retcode: %s)", |
| 2836 | cmd_ctx->lttng_msg_size, |
| 2837 | lttng_get_readable_code(cmd_ctx->llm->ret_code)); |
| 2838 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
| 2839 | if (ret < 0) { |
| 2840 | ERR("Failed to send data back to client"); |
| 2841 | } |
| 2842 | |
| 2843 | clean_command_ctx(&cmd_ctx); |
| 2844 | |
| 2845 | /* End of transmission */ |
| 2846 | close(sock); |
| 2847 | } |
| 2848 | |
| 2849 | error: |
| 2850 | DBG("Client thread dying"); |
| 2851 | unlink(client_unix_sock_path); |
| 2852 | close(client_sock); |
| 2853 | close(sock); |
| 2854 | |
| 2855 | lttng_poll_clean(&events); |
| 2856 | clean_command_ctx(&cmd_ctx); |
| 2857 | return NULL; |
| 2858 | } |
| 2859 | |
| 2860 | |
| 2861 | /* |
| 2862 | * usage function on stderr |
| 2863 | */ |
| 2864 | static void usage(void) |
| 2865 | { |
| 2866 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
| 2867 | fprintf(stderr, " -h, --help Display this usage.\n"); |
| 2868 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); |
| 2869 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); |
| 2870 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); |
| 2871 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); |
| 2872 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
| 2873 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); |
| 2874 | fprintf(stderr, " -V, --version Show version number.\n"); |
| 2875 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); |
| 2876 | fprintf(stderr, " -q, --quiet No output at all.\n"); |
| 2877 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); |
| 2878 | fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); |
| 2879 | } |
| 2880 | |
| 2881 | /* |
| 2882 | * daemon argument parsing |
| 2883 | */ |
| 2884 | static int parse_args(int argc, char **argv) |
| 2885 | { |
| 2886 | int c; |
| 2887 | |
| 2888 | static struct option long_options[] = { |
| 2889 | { "client-sock", 1, 0, 'c' }, |
| 2890 | { "apps-sock", 1, 0, 'a' }, |
| 2891 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
| 2892 | { "kconsumerd-err-sock", 1, 0, 0 }, |
| 2893 | { "daemonize", 0, 0, 'd' }, |
| 2894 | { "sig-parent", 0, 0, 'S' }, |
| 2895 | { "help", 0, 0, 'h' }, |
| 2896 | { "group", 1, 0, 'g' }, |
| 2897 | { "version", 0, 0, 'V' }, |
| 2898 | { "quiet", 0, 0, 'q' }, |
| 2899 | { "verbose", 0, 0, 'v' }, |
| 2900 | { "verbose-kconsumerd", 0, 0, 'Z' }, |
| 2901 | { NULL, 0, 0, 0 } |
| 2902 | }; |
| 2903 | |
| 2904 | while (1) { |
| 2905 | int option_index = 0; |
| 2906 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", |
| 2907 | long_options, &option_index); |
| 2908 | if (c == -1) { |
| 2909 | break; |
| 2910 | } |
| 2911 | |
| 2912 | switch (c) { |
| 2913 | case 0: |
| 2914 | fprintf(stderr, "option %s", long_options[option_index].name); |
| 2915 | if (optarg) { |
| 2916 | fprintf(stderr, " with arg %s\n", optarg); |
| 2917 | } |
| 2918 | break; |
| 2919 | case 'c': |
| 2920 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
| 2921 | break; |
| 2922 | case 'a': |
| 2923 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); |
| 2924 | break; |
| 2925 | case 'd': |
| 2926 | opt_daemon = 1; |
| 2927 | break; |
| 2928 | case 'g': |
| 2929 | opt_tracing_group = strdup(optarg); |
| 2930 | break; |
| 2931 | case 'h': |
| 2932 | usage(); |
| 2933 | exit(EXIT_FAILURE); |
| 2934 | case 'V': |
| 2935 | fprintf(stdout, "%s\n", VERSION); |
| 2936 | exit(EXIT_SUCCESS); |
| 2937 | case 'S': |
| 2938 | opt_sig_parent = 1; |
| 2939 | break; |
| 2940 | case 'E': |
| 2941 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); |
| 2942 | break; |
| 2943 | case 'C': |
| 2944 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
| 2945 | break; |
| 2946 | case 'q': |
| 2947 | opt_quiet = 1; |
| 2948 | break; |
| 2949 | case 'v': |
| 2950 | /* Verbose level can increase using multiple -v */ |
| 2951 | opt_verbose += 1; |
| 2952 | break; |
| 2953 | case 'Z': |
| 2954 | opt_verbose_kconsumerd += 1; |
| 2955 | break; |
| 2956 | default: |
| 2957 | /* Unknown option or other error. |
| 2958 | * Error is printed by getopt, just return */ |
| 2959 | return -1; |
| 2960 | } |
| 2961 | } |
| 2962 | |
| 2963 | return 0; |
| 2964 | } |
| 2965 | |
| 2966 | /* |
| 2967 | * Creates the two needed socket by the daemon. |
| 2968 | * apps_sock - The communication socket for all UST apps. |
| 2969 | * client_sock - The communication of the cli tool (lttng). |
| 2970 | */ |
| 2971 | static int init_daemon_socket(void) |
| 2972 | { |
| 2973 | int ret = 0; |
| 2974 | mode_t old_umask; |
| 2975 | |
| 2976 | old_umask = umask(0); |
| 2977 | |
| 2978 | /* Create client tool unix socket */ |
| 2979 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
| 2980 | if (client_sock < 0) { |
| 2981 | ERR("Create unix sock failed: %s", client_unix_sock_path); |
| 2982 | ret = -1; |
| 2983 | goto end; |
| 2984 | } |
| 2985 | |
| 2986 | /* File permission MUST be 660 */ |
| 2987 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 2988 | if (ret < 0) { |
| 2989 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
| 2990 | perror("chmod"); |
| 2991 | goto end; |
| 2992 | } |
| 2993 | |
| 2994 | /* Create the application unix socket */ |
| 2995 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
| 2996 | if (apps_sock < 0) { |
| 2997 | ERR("Create unix sock failed: %s", apps_unix_sock_path); |
| 2998 | ret = -1; |
| 2999 | goto end; |
| 3000 | } |
| 3001 | |
| 3002 | /* File permission MUST be 666 */ |
| 3003 | ret = chmod(apps_unix_sock_path, |
| 3004 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
| 3005 | if (ret < 0) { |
| 3006 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
| 3007 | perror("chmod"); |
| 3008 | goto end; |
| 3009 | } |
| 3010 | |
| 3011 | end: |
| 3012 | umask(old_umask); |
| 3013 | return ret; |
| 3014 | } |
| 3015 | |
| 3016 | /* |
| 3017 | * Check if the global socket is available, and if a daemon is answering at the |
| 3018 | * other side. If yes, error is returned. |
| 3019 | */ |
| 3020 | static int check_existing_daemon(void) |
| 3021 | { |
| 3022 | if (access(client_unix_sock_path, F_OK) < 0 && |
| 3023 | access(apps_unix_sock_path, F_OK) < 0) { |
| 3024 | return 0; |
| 3025 | } |
| 3026 | |
| 3027 | /* Is there anybody out there ? */ |
| 3028 | if (lttng_session_daemon_alive()) { |
| 3029 | return -EEXIST; |
| 3030 | } else { |
| 3031 | return 0; |
| 3032 | } |
| 3033 | } |
| 3034 | |
| 3035 | /* |
| 3036 | * Set the tracing group gid onto the client socket. |
| 3037 | * |
| 3038 | * Race window between mkdir and chown is OK because we are going from more |
| 3039 | * permissive (root.root) to les permissive (root.tracing). |
| 3040 | */ |
| 3041 | static int set_permissions(void) |
| 3042 | { |
| 3043 | int ret; |
| 3044 | gid_t gid; |
| 3045 | |
| 3046 | gid = allowed_group(); |
| 3047 | if (gid < 0) { |
| 3048 | if (is_root) { |
| 3049 | WARN("No tracing group detected"); |
| 3050 | ret = 0; |
| 3051 | } else { |
| 3052 | ERR("Missing tracing group. Aborting execution."); |
| 3053 | ret = -1; |
| 3054 | } |
| 3055 | goto end; |
| 3056 | } |
| 3057 | |
| 3058 | /* Set lttng run dir */ |
| 3059 | ret = chown(LTTNG_RUNDIR, 0, gid); |
| 3060 | if (ret < 0) { |
| 3061 | ERR("Unable to set group on " LTTNG_RUNDIR); |
| 3062 | perror("chown"); |
| 3063 | } |
| 3064 | |
| 3065 | /* lttng client socket path */ |
| 3066 | ret = chown(client_unix_sock_path, 0, gid); |
| 3067 | if (ret < 0) { |
| 3068 | ERR("Unable to set group on %s", client_unix_sock_path); |
| 3069 | perror("chown"); |
| 3070 | } |
| 3071 | |
| 3072 | /* kconsumerd error socket path */ |
| 3073 | ret = chown(kconsumerd_err_unix_sock_path, 0, gid); |
| 3074 | if (ret < 0) { |
| 3075 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); |
| 3076 | perror("chown"); |
| 3077 | } |
| 3078 | |
| 3079 | DBG("All permissions are set"); |
| 3080 | |
| 3081 | end: |
| 3082 | return ret; |
| 3083 | } |
| 3084 | |
| 3085 | /* |
| 3086 | * Create the pipe used to wake up the kernel thread. |
| 3087 | */ |
| 3088 | static int create_kernel_poll_pipe(void) |
| 3089 | { |
| 3090 | return pipe2(kernel_poll_pipe, O_CLOEXEC); |
| 3091 | } |
| 3092 | |
| 3093 | /* |
| 3094 | * Create the application command pipe to wake thread_manage_apps. |
| 3095 | */ |
| 3096 | static int create_apps_cmd_pipe(void) |
| 3097 | { |
| 3098 | return pipe2(apps_cmd_pipe, O_CLOEXEC); |
| 3099 | } |
| 3100 | |
| 3101 | /* |
| 3102 | * Create the lttng run directory needed for all global sockets and pipe. |
| 3103 | */ |
| 3104 | static int create_lttng_rundir(void) |
| 3105 | { |
| 3106 | int ret; |
| 3107 | |
| 3108 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); |
| 3109 | if (ret < 0) { |
| 3110 | if (errno != EEXIST) { |
| 3111 | ERR("Unable to create " LTTNG_RUNDIR); |
| 3112 | goto error; |
| 3113 | } else { |
| 3114 | ret = 0; |
| 3115 | } |
| 3116 | } |
| 3117 | |
| 3118 | error: |
| 3119 | return ret; |
| 3120 | } |
| 3121 | |
| 3122 | /* |
| 3123 | * Setup sockets and directory needed by the kconsumerd communication with the |
| 3124 | * session daemon. |
| 3125 | */ |
| 3126 | static int set_kconsumerd_sockets(void) |
| 3127 | { |
| 3128 | int ret; |
| 3129 | |
| 3130 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { |
| 3131 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, |
| 3132 | KCONSUMERD_ERR_SOCK_PATH); |
| 3133 | } |
| 3134 | |
| 3135 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { |
| 3136 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, |
| 3137 | KCONSUMERD_CMD_SOCK_PATH); |
| 3138 | } |
| 3139 | |
| 3140 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); |
| 3141 | if (ret < 0) { |
| 3142 | if (errno != EEXIST) { |
| 3143 | ERR("Failed to create " KCONSUMERD_PATH); |
| 3144 | goto error; |
| 3145 | } |
| 3146 | ret = 0; |
| 3147 | } |
| 3148 | |
| 3149 | /* Create the kconsumerd error unix socket */ |
| 3150 | kconsumerd_err_sock = |
| 3151 | lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); |
| 3152 | if (kconsumerd_err_sock < 0) { |
| 3153 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); |
| 3154 | ret = -1; |
| 3155 | goto error; |
| 3156 | } |
| 3157 | |
| 3158 | /* File permission MUST be 660 */ |
| 3159 | ret = chmod(kconsumerd_err_unix_sock_path, |
| 3160 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 3161 | if (ret < 0) { |
| 3162 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); |
| 3163 | perror("chmod"); |
| 3164 | goto error; |
| 3165 | } |
| 3166 | |
| 3167 | error: |
| 3168 | return ret; |
| 3169 | } |
| 3170 | |
| 3171 | /* |
| 3172 | * Signal handler for the daemon |
| 3173 | * |
| 3174 | * Simply stop all worker threads, leaving main() return gracefully after |
| 3175 | * joining all threads and calling cleanup(). |
| 3176 | */ |
| 3177 | static void sighandler(int sig) |
| 3178 | { |
| 3179 | switch (sig) { |
| 3180 | case SIGPIPE: |
| 3181 | DBG("SIGPIPE catched"); |
| 3182 | return; |
| 3183 | case SIGINT: |
| 3184 | DBG("SIGINT catched"); |
| 3185 | stop_threads(); |
| 3186 | break; |
| 3187 | case SIGTERM: |
| 3188 | DBG("SIGTERM catched"); |
| 3189 | stop_threads(); |
| 3190 | break; |
| 3191 | default: |
| 3192 | break; |
| 3193 | } |
| 3194 | } |
| 3195 | |
| 3196 | /* |
| 3197 | * Setup signal handler for : |
| 3198 | * SIGINT, SIGTERM, SIGPIPE |
| 3199 | */ |
| 3200 | static int set_signal_handler(void) |
| 3201 | { |
| 3202 | int ret = 0; |
| 3203 | struct sigaction sa; |
| 3204 | sigset_t sigset; |
| 3205 | |
| 3206 | if ((ret = sigemptyset(&sigset)) < 0) { |
| 3207 | perror("sigemptyset"); |
| 3208 | return ret; |
| 3209 | } |
| 3210 | |
| 3211 | sa.sa_handler = sighandler; |
| 3212 | sa.sa_mask = sigset; |
| 3213 | sa.sa_flags = 0; |
| 3214 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
| 3215 | perror("sigaction"); |
| 3216 | return ret; |
| 3217 | } |
| 3218 | |
| 3219 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
| 3220 | perror("sigaction"); |
| 3221 | return ret; |
| 3222 | } |
| 3223 | |
| 3224 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
| 3225 | perror("sigaction"); |
| 3226 | return ret; |
| 3227 | } |
| 3228 | |
| 3229 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
| 3230 | |
| 3231 | return ret; |
| 3232 | } |
| 3233 | |
| 3234 | /* |
| 3235 | * Set open files limit to unlimited. This daemon can open a large number of |
| 3236 | * file descriptors in order to consumer multiple kernel traces. |
| 3237 | */ |
| 3238 | static void set_ulimit(void) |
| 3239 | { |
| 3240 | int ret; |
| 3241 | struct rlimit lim; |
| 3242 | |
| 3243 | /* The kernel does not allowed an infinite limit for open files */ |
| 3244 | lim.rlim_cur = 65535; |
| 3245 | lim.rlim_max = 65535; |
| 3246 | |
| 3247 | ret = setrlimit(RLIMIT_NOFILE, &lim); |
| 3248 | if (ret < 0) { |
| 3249 | perror("failed to set open files limit"); |
| 3250 | } |
| 3251 | } |
| 3252 | |
| 3253 | /* |
| 3254 | * main |
| 3255 | */ |
| 3256 | int main(int argc, char **argv) |
| 3257 | { |
| 3258 | int ret = 0; |
| 3259 | void *status; |
| 3260 | const char *home_path; |
| 3261 | |
| 3262 | /* Create thread quit pipe */ |
| 3263 | if ((ret = init_thread_quit_pipe()) < 0) { |
| 3264 | goto error; |
| 3265 | } |
| 3266 | |
| 3267 | /* Parse arguments */ |
| 3268 | progname = argv[0]; |
| 3269 | if ((ret = parse_args(argc, argv) < 0)) { |
| 3270 | goto error; |
| 3271 | } |
| 3272 | |
| 3273 | /* Daemonize */ |
| 3274 | if (opt_daemon) { |
| 3275 | ret = daemon(0, 0); |
| 3276 | if (ret < 0) { |
| 3277 | perror("daemon"); |
| 3278 | goto error; |
| 3279 | } |
| 3280 | } |
| 3281 | |
| 3282 | /* Check if daemon is UID = 0 */ |
| 3283 | is_root = !getuid(); |
| 3284 | |
| 3285 | if (is_root) { |
| 3286 | ret = create_lttng_rundir(); |
| 3287 | if (ret < 0) { |
| 3288 | goto error; |
| 3289 | } |
| 3290 | |
| 3291 | if (strlen(apps_unix_sock_path) == 0) { |
| 3292 | snprintf(apps_unix_sock_path, PATH_MAX, |
| 3293 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); |
| 3294 | } |
| 3295 | |
| 3296 | if (strlen(client_unix_sock_path) == 0) { |
| 3297 | snprintf(client_unix_sock_path, PATH_MAX, |
| 3298 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); |
| 3299 | } |
| 3300 | |
| 3301 | /* Set global SHM for ust */ |
| 3302 | if (strlen(wait_shm_path) == 0) { |
| 3303 | snprintf(wait_shm_path, PATH_MAX, |
| 3304 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); |
| 3305 | } |
| 3306 | } else { |
| 3307 | home_path = get_home_dir(); |
| 3308 | if (home_path == NULL) { |
| 3309 | /* TODO: Add --socket PATH option */ |
| 3310 | ERR("Can't get HOME directory for sockets creation."); |
| 3311 | ret = -EPERM; |
| 3312 | goto error; |
| 3313 | } |
| 3314 | |
| 3315 | if (strlen(apps_unix_sock_path) == 0) { |
| 3316 | snprintf(apps_unix_sock_path, PATH_MAX, |
| 3317 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
| 3318 | } |
| 3319 | |
| 3320 | /* Set the cli tool unix socket path */ |
| 3321 | if (strlen(client_unix_sock_path) == 0) { |
| 3322 | snprintf(client_unix_sock_path, PATH_MAX, |
| 3323 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
| 3324 | } |
| 3325 | |
| 3326 | /* Set global SHM for ust */ |
| 3327 | if (strlen(wait_shm_path) == 0) { |
| 3328 | snprintf(wait_shm_path, PATH_MAX, |
| 3329 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); |
| 3330 | } |
| 3331 | } |
| 3332 | |
| 3333 | DBG("Client socket path %s", client_unix_sock_path); |
| 3334 | DBG("Application socket path %s", apps_unix_sock_path); |
| 3335 | |
| 3336 | /* |
| 3337 | * See if daemon already exist. |
| 3338 | */ |
| 3339 | if ((ret = check_existing_daemon()) < 0) { |
| 3340 | ERR("Already running daemon.\n"); |
| 3341 | /* |
| 3342 | * We do not goto exit because we must not cleanup() |
| 3343 | * because a daemon is already running. |
| 3344 | */ |
| 3345 | goto error; |
| 3346 | } |
| 3347 | |
| 3348 | /* After this point, we can safely call cleanup() with "goto exit" */ |
| 3349 | |
| 3350 | /* |
| 3351 | * These actions must be executed as root. We do that *after* setting up |
| 3352 | * the sockets path because we MUST make the check for another daemon using |
| 3353 | * those paths *before* trying to set the kernel consumer sockets and init |
| 3354 | * kernel tracer. |
| 3355 | */ |
| 3356 | if (is_root) { |
| 3357 | ret = set_kconsumerd_sockets(); |
| 3358 | if (ret < 0) { |
| 3359 | goto exit; |
| 3360 | } |
| 3361 | |
| 3362 | /* Setup kernel tracer */ |
| 3363 | init_kernel_tracer(); |
| 3364 | |
| 3365 | /* Set ulimit for open files */ |
| 3366 | set_ulimit(); |
| 3367 | } |
| 3368 | |
| 3369 | if ((ret = set_signal_handler()) < 0) { |
| 3370 | goto exit; |
| 3371 | } |
| 3372 | |
| 3373 | /* Setup the needed unix socket */ |
| 3374 | if ((ret = init_daemon_socket()) < 0) { |
| 3375 | goto exit; |
| 3376 | } |
| 3377 | |
| 3378 | /* Set credentials to socket */ |
| 3379 | if (is_root && ((ret = set_permissions()) < 0)) { |
| 3380 | goto exit; |
| 3381 | } |
| 3382 | |
| 3383 | /* Get parent pid if -S, --sig-parent is specified. */ |
| 3384 | if (opt_sig_parent) { |
| 3385 | ppid = getppid(); |
| 3386 | } |
| 3387 | |
| 3388 | /* Setup the kernel pipe for waking up the kernel thread */ |
| 3389 | if ((ret = create_kernel_poll_pipe()) < 0) { |
| 3390 | goto exit; |
| 3391 | } |
| 3392 | |
| 3393 | /* Setup the thread apps communication pipe. */ |
| 3394 | if ((ret = create_apps_cmd_pipe()) < 0) { |
| 3395 | goto exit; |
| 3396 | } |
| 3397 | |
| 3398 | /* Init UST command queue. */ |
| 3399 | cds_wfq_init(&ust_cmd_queue.queue); |
| 3400 | |
| 3401 | /* |
| 3402 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
| 3403 | * statically declared in session.c |
| 3404 | */ |
| 3405 | session_list_ptr = session_get_list(); |
| 3406 | |
| 3407 | /* Set up max poll set size */ |
| 3408 | lttng_poll_set_max_size(); |
| 3409 | |
| 3410 | /* Create thread to manage the client socket */ |
| 3411 | ret = pthread_create(&client_thread, NULL, |
| 3412 | thread_manage_clients, (void *) NULL); |
| 3413 | if (ret != 0) { |
| 3414 | perror("pthread_create clients"); |
| 3415 | goto exit_client; |
| 3416 | } |
| 3417 | |
| 3418 | /* Create thread to dispatch registration */ |
| 3419 | ret = pthread_create(&dispatch_thread, NULL, |
| 3420 | thread_dispatch_ust_registration, (void *) NULL); |
| 3421 | if (ret != 0) { |
| 3422 | perror("pthread_create dispatch"); |
| 3423 | goto exit_dispatch; |
| 3424 | } |
| 3425 | |
| 3426 | /* Create thread to manage application registration. */ |
| 3427 | ret = pthread_create(®_apps_thread, NULL, |
| 3428 | thread_registration_apps, (void *) NULL); |
| 3429 | if (ret != 0) { |
| 3430 | perror("pthread_create registration"); |
| 3431 | goto exit_reg_apps; |
| 3432 | } |
| 3433 | |
| 3434 | /* Create thread to manage application socket */ |
| 3435 | ret = pthread_create(&apps_thread, NULL, |
| 3436 | thread_manage_apps, (void *) NULL); |
| 3437 | if (ret != 0) { |
| 3438 | perror("pthread_create apps"); |
| 3439 | goto exit_apps; |
| 3440 | } |
| 3441 | |
| 3442 | /* Create kernel thread to manage kernel event */ |
| 3443 | ret = pthread_create(&kernel_thread, NULL, |
| 3444 | thread_manage_kernel, (void *) NULL); |
| 3445 | if (ret != 0) { |
| 3446 | perror("pthread_create kernel"); |
| 3447 | goto exit_kernel; |
| 3448 | } |
| 3449 | |
| 3450 | ret = pthread_join(kernel_thread, &status); |
| 3451 | if (ret != 0) { |
| 3452 | perror("pthread_join"); |
| 3453 | goto error; /* join error, exit without cleanup */ |
| 3454 | } |
| 3455 | |
| 3456 | exit_kernel: |
| 3457 | ret = pthread_join(apps_thread, &status); |
| 3458 | if (ret != 0) { |
| 3459 | perror("pthread_join"); |
| 3460 | goto error; /* join error, exit without cleanup */ |
| 3461 | } |
| 3462 | |
| 3463 | exit_apps: |
| 3464 | ret = pthread_join(reg_apps_thread, &status); |
| 3465 | if (ret != 0) { |
| 3466 | perror("pthread_join"); |
| 3467 | goto error; /* join error, exit without cleanup */ |
| 3468 | } |
| 3469 | |
| 3470 | exit_reg_apps: |
| 3471 | ret = pthread_join(dispatch_thread, &status); |
| 3472 | if (ret != 0) { |
| 3473 | perror("pthread_join"); |
| 3474 | goto error; /* join error, exit without cleanup */ |
| 3475 | } |
| 3476 | |
| 3477 | exit_dispatch: |
| 3478 | ret = pthread_join(client_thread, &status); |
| 3479 | if (ret != 0) { |
| 3480 | perror("pthread_join"); |
| 3481 | goto error; /* join error, exit without cleanup */ |
| 3482 | } |
| 3483 | |
| 3484 | ret = join_kconsumerd_thread(); |
| 3485 | if (ret != 0) { |
| 3486 | perror("join_kconsumerd"); |
| 3487 | goto error; /* join error, exit without cleanup */ |
| 3488 | } |
| 3489 | |
| 3490 | exit_client: |
| 3491 | exit: |
| 3492 | /* |
| 3493 | * cleanup() is called when no other thread is running. |
| 3494 | */ |
| 3495 | cleanup(); |
| 3496 | if (!ret) |
| 3497 | exit(EXIT_SUCCESS); |
| 3498 | error: |
| 3499 | exit(EXIT_FAILURE); |
| 3500 | } |