| 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 |
| 6 | * modify it under the terms of the GNU General Public License |
| 7 | * as published by the Free Software Foundation; only version 2 |
| 8 | * of the License. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
| 16 | * along with this program; if not, write to the Free Software |
| 17 | * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 18 | */ |
| 19 | |
| 20 | #define _GNU_SOURCE |
| 21 | #include <fcntl.h> |
| 22 | #include <getopt.h> |
| 23 | #include <grp.h> |
| 24 | #include <limits.h> |
| 25 | #include <poll.h> |
| 26 | #include <pthread.h> |
| 27 | #include <semaphore.h> |
| 28 | #include <signal.h> |
| 29 | #include <stdio.h> |
| 30 | #include <stdlib.h> |
| 31 | #include <string.h> |
| 32 | #include <sys/mman.h> |
| 33 | #include <sys/mount.h> |
| 34 | #include <sys/resource.h> |
| 35 | #include <sys/socket.h> |
| 36 | #include <sys/stat.h> |
| 37 | #include <sys/types.h> |
| 38 | #include <sys/wait.h> |
| 39 | #include <urcu/futex.h> |
| 40 | #include <unistd.h> |
| 41 | |
| 42 | #include <ltt-kconsumerd.h> |
| 43 | #include <lttng-sessiond-comm.h> |
| 44 | #include <lttng/lttng-kconsumerd.h> |
| 45 | #include <lttngerr.h> |
| 46 | |
| 47 | #include "context.h" |
| 48 | #include "futex.h" |
| 49 | #include "kernel-ctl.h" |
| 50 | #include "ltt-sessiond.h" |
| 51 | #include "shm.h" |
| 52 | #include "traceable-app.h" |
| 53 | #include "ust-ctl.h" |
| 54 | #include "utils.h" |
| 55 | #include "ust-ctl.h" |
| 56 | |
| 57 | #include "benchmark.h" |
| 58 | |
| 59 | /* Const values */ |
| 60 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
| 61 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
| 62 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
| 63 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; |
| 64 | |
| 65 | /* Variables */ |
| 66 | int opt_verbose; /* Not static for lttngerr.h */ |
| 67 | int opt_verbose_kconsumerd; /* Not static for lttngerr.h */ |
| 68 | int opt_quiet; /* Not static for lttngerr.h */ |
| 69 | |
| 70 | const char *progname; |
| 71 | const char *opt_tracing_group; |
| 72 | static int opt_sig_parent; |
| 73 | static int opt_daemon; |
| 74 | static int is_root; /* Set to 1 if the daemon is running as root */ |
| 75 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
| 76 | static pid_t kconsumerd_pid; |
| 77 | static struct pollfd *kernel_pollfd; |
| 78 | static int dispatch_thread_exit; |
| 79 | |
| 80 | static char apps_unix_sock_path[PATH_MAX]; /* Global application Unix socket path */ |
| 81 | static char client_unix_sock_path[PATH_MAX]; /* Global client Unix socket path */ |
| 82 | static char kconsumerd_err_unix_sock_path[PATH_MAX]; /* kconsumerd error Unix socket path */ |
| 83 | static char kconsumerd_cmd_unix_sock_path[PATH_MAX]; /* kconsumerd command Unix socket path */ |
| 84 | static char wait_shm_path[PATH_MAX]; /* global wait shm path for UST */ |
| 85 | |
| 86 | /* Sockets and FDs */ |
| 87 | static int client_sock; |
| 88 | static int apps_sock; |
| 89 | static int kconsumerd_err_sock; |
| 90 | static int kconsumerd_cmd_sock; |
| 91 | static int kernel_tracer_fd; |
| 92 | static int kernel_poll_pipe[2]; |
| 93 | |
| 94 | /* |
| 95 | * Quit pipe for all threads. This permits a single cancellation point |
| 96 | * for all threads when receiving an event on the pipe. |
| 97 | */ |
| 98 | static int thread_quit_pipe[2]; |
| 99 | |
| 100 | /* |
| 101 | * This pipe is used to inform the thread managing application communication |
| 102 | * that a command is queued and ready to be processed. |
| 103 | */ |
| 104 | static int apps_cmd_pipe[2]; |
| 105 | |
| 106 | /* Pthread, Mutexes and Semaphores */ |
| 107 | static pthread_t kconsumerd_thread; |
| 108 | static pthread_t apps_thread; |
| 109 | static pthread_t reg_apps_thread; |
| 110 | static pthread_t client_thread; |
| 111 | static pthread_t kernel_thread; |
| 112 | static pthread_t dispatch_thread; |
| 113 | static sem_t kconsumerd_sem; |
| 114 | |
| 115 | static pthread_mutex_t kconsumerd_pid_mutex; /* Mutex to control kconsumerd pid assignation */ |
| 116 | |
| 117 | /* |
| 118 | * UST registration command queue. This queue is tied with a futex and uses a N |
| 119 | * wakers / 1 waiter implemented and detailed in futex.c/.h |
| 120 | * |
| 121 | * The thread_manage_apps and thread_dispatch_ust_registration interact with |
| 122 | * this queue and the wait/wake scheme. |
| 123 | */ |
| 124 | static struct ust_cmd_queue ust_cmd_queue; |
| 125 | |
| 126 | /* |
| 127 | * Pointer initialized before thread creation. |
| 128 | * |
| 129 | * This points to the tracing session list containing the session count and a |
| 130 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock |
| 131 | * MUST NOT be taken if you call a public function in session.c. |
| 132 | * |
| 133 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
| 134 | * lock_session_list and unlock_session_list for lock acquisition. |
| 135 | */ |
| 136 | static struct ltt_session_list *session_list_ptr; |
| 137 | |
| 138 | /* |
| 139 | * Remove modules in reverse load order. |
| 140 | */ |
| 141 | static int modprobe_remove_kernel_modules(void) |
| 142 | { |
| 143 | int ret = 0, i; |
| 144 | char modprobe[256]; |
| 145 | |
| 146 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { |
| 147 | ret = snprintf(modprobe, sizeof(modprobe), |
| 148 | "/sbin/modprobe --remove --quiet %s", |
| 149 | kernel_modules_list[i].name); |
| 150 | if (ret < 0) { |
| 151 | perror("snprintf modprobe --remove"); |
| 152 | goto error; |
| 153 | } |
| 154 | modprobe[sizeof(modprobe) - 1] = '\0'; |
| 155 | ret = system(modprobe); |
| 156 | if (ret == -1) { |
| 157 | ERR("Unable to launch modprobe --remove for module %s", |
| 158 | kernel_modules_list[i].name); |
| 159 | } else if (kernel_modules_list[i].required |
| 160 | && WEXITSTATUS(ret) != 0) { |
| 161 | ERR("Unable to remove module %s", |
| 162 | kernel_modules_list[i].name); |
| 163 | } else { |
| 164 | DBG("Modprobe removal successful %s", |
| 165 | kernel_modules_list[i].name); |
| 166 | } |
| 167 | } |
| 168 | |
| 169 | error: |
| 170 | return ret; |
| 171 | } |
| 172 | |
| 173 | /* |
| 174 | * Return group ID of the tracing group or -1 if not found. |
| 175 | */ |
| 176 | static gid_t allowed_group(void) |
| 177 | { |
| 178 | struct group *grp; |
| 179 | |
| 180 | if (opt_tracing_group) { |
| 181 | grp = getgrnam(opt_tracing_group); |
| 182 | } else { |
| 183 | grp = getgrnam(default_tracing_group); |
| 184 | } |
| 185 | if (!grp) { |
| 186 | return -1; |
| 187 | } else { |
| 188 | return grp->gr_gid; |
| 189 | } |
| 190 | } |
| 191 | |
| 192 | /* |
| 193 | * Init quit pipe. |
| 194 | * |
| 195 | * Return -1 on error or 0 if all pipes are created. |
| 196 | */ |
| 197 | static int init_thread_quit_pipe(void) |
| 198 | { |
| 199 | int ret; |
| 200 | |
| 201 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); |
| 202 | if (ret < 0) { |
| 203 | perror("thread quit pipe"); |
| 204 | goto error; |
| 205 | } |
| 206 | |
| 207 | error: |
| 208 | return ret; |
| 209 | } |
| 210 | |
| 211 | /* |
| 212 | * Complete teardown of a kernel session. This free all data structure related |
| 213 | * to a kernel session and update counter. |
| 214 | */ |
| 215 | static void teardown_kernel_session(struct ltt_session *session) |
| 216 | { |
| 217 | if (session->kernel_session != NULL) { |
| 218 | DBG("Tearing down kernel session"); |
| 219 | |
| 220 | /* |
| 221 | * If a custom kernel consumer was registered, close the socket before |
| 222 | * tearing down the complete kernel session structure |
| 223 | */ |
| 224 | if (session->kernel_session->consumer_fd != kconsumerd_cmd_sock) { |
| 225 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); |
| 226 | } |
| 227 | |
| 228 | trace_kernel_destroy_session(session->kernel_session); |
| 229 | /* Extra precaution */ |
| 230 | session->kernel_session = NULL; |
| 231 | } |
| 232 | } |
| 233 | |
| 234 | /* |
| 235 | * Stop all threads by closing the thread quit pipe. |
| 236 | */ |
| 237 | static void stop_threads(void) |
| 238 | { |
| 239 | /* Stopping all threads */ |
| 240 | DBG("Terminating all threads"); |
| 241 | close(thread_quit_pipe[0]); |
| 242 | close(thread_quit_pipe[1]); |
| 243 | /* Dispatch thread */ |
| 244 | dispatch_thread_exit = 1; |
| 245 | futex_nto1_wake(&ust_cmd_queue.futex); |
| 246 | } |
| 247 | |
| 248 | /* |
| 249 | * Cleanup the daemon |
| 250 | */ |
| 251 | static void cleanup(void) |
| 252 | { |
| 253 | int ret; |
| 254 | char *cmd; |
| 255 | struct ltt_session *sess, *stmp; |
| 256 | |
| 257 | DBG("Cleaning up"); |
| 258 | |
| 259 | /* <fun> */ |
| 260 | MSG("%c[%d;%dm*** assert failed *** ==> %c[%dm%c[%d;%dm" |
| 261 | "Matthew, BEET driven development works!%c[%dm", |
| 262 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); |
| 263 | /* </fun> */ |
| 264 | |
| 265 | DBG("Removing %s directory", LTTNG_RUNDIR); |
| 266 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); |
| 267 | if (ret < 0) { |
| 268 | ERR("asprintf failed. Something is really wrong!"); |
| 269 | } |
| 270 | |
| 271 | /* Remove lttng run directory */ |
| 272 | ret = system(cmd); |
| 273 | if (ret < 0) { |
| 274 | ERR("Unable to clean " LTTNG_RUNDIR); |
| 275 | } |
| 276 | |
| 277 | DBG("Cleaning up all session"); |
| 278 | |
| 279 | /* Destroy session list mutex */ |
| 280 | if (session_list_ptr != NULL) { |
| 281 | pthread_mutex_destroy(&session_list_ptr->lock); |
| 282 | |
| 283 | /* Cleanup ALL session */ |
| 284 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { |
| 285 | teardown_kernel_session(sess); |
| 286 | // TODO complete session cleanup (including UST) |
| 287 | } |
| 288 | } |
| 289 | |
| 290 | DBG("Closing all UST sockets"); |
| 291 | clean_traceable_apps_list(); |
| 292 | |
| 293 | pthread_mutex_destroy(&kconsumerd_pid_mutex); |
| 294 | |
| 295 | DBG("Closing kernel fd"); |
| 296 | close(kernel_tracer_fd); |
| 297 | |
| 298 | if (is_root) { |
| 299 | DBG("Unloading kernel modules"); |
| 300 | modprobe_remove_kernel_modules(); |
| 301 | } |
| 302 | |
| 303 | /* OUTPUT BENCHMARK RESULTS */ |
| 304 | bench_init(); |
| 305 | |
| 306 | bench_print_boot_process(); |
| 307 | |
| 308 | bench_close(); |
| 309 | /* END BENCHMARK */ |
| 310 | } |
| 311 | |
| 312 | /* |
| 313 | * Send data on a unix socket using the liblttsessiondcomm API. |
| 314 | * |
| 315 | * Return lttcomm error code. |
| 316 | */ |
| 317 | static int send_unix_sock(int sock, void *buf, size_t len) |
| 318 | { |
| 319 | /* Check valid length */ |
| 320 | if (len <= 0) { |
| 321 | return -1; |
| 322 | } |
| 323 | |
| 324 | return lttcomm_send_unix_sock(sock, buf, len); |
| 325 | } |
| 326 | |
| 327 | /* |
| 328 | * Free memory of a command context structure. |
| 329 | */ |
| 330 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
| 331 | { |
| 332 | DBG("Clean command context structure"); |
| 333 | if (*cmd_ctx) { |
| 334 | if ((*cmd_ctx)->llm) { |
| 335 | free((*cmd_ctx)->llm); |
| 336 | } |
| 337 | if ((*cmd_ctx)->lsm) { |
| 338 | free((*cmd_ctx)->lsm); |
| 339 | } |
| 340 | free(*cmd_ctx); |
| 341 | *cmd_ctx = NULL; |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | /* |
| 346 | * Send all stream fds of kernel channel to the consumer. |
| 347 | */ |
| 348 | static int send_kconsumerd_channel_fds(int sock, struct ltt_kernel_channel *channel) |
| 349 | { |
| 350 | int ret; |
| 351 | size_t nb_fd; |
| 352 | struct ltt_kernel_stream *stream; |
| 353 | struct lttcomm_kconsumerd_header lkh; |
| 354 | struct lttcomm_kconsumerd_msg lkm; |
| 355 | |
| 356 | DBG("Sending fds of channel %s to kernel consumer", channel->channel->name); |
| 357 | |
| 358 | nb_fd = channel->stream_count; |
| 359 | |
| 360 | /* Setup header */ |
| 361 | lkh.payload_size = nb_fd * sizeof(struct lttcomm_kconsumerd_msg); |
| 362 | lkh.cmd_type = ADD_STREAM; |
| 363 | |
| 364 | DBG("Sending kconsumerd header"); |
| 365 | |
| 366 | ret = lttcomm_send_unix_sock(sock, &lkh, sizeof(struct lttcomm_kconsumerd_header)); |
| 367 | if (ret < 0) { |
| 368 | perror("send kconsumerd header"); |
| 369 | goto error; |
| 370 | } |
| 371 | |
| 372 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
| 373 | if (stream->fd != 0) { |
| 374 | lkm.fd = stream->fd; |
| 375 | lkm.state = stream->state; |
| 376 | lkm.max_sb_size = channel->channel->attr.subbuf_size; |
| 377 | lkm.output = channel->channel->attr.output; |
| 378 | strncpy(lkm.path_name, stream->pathname, PATH_MAX); |
| 379 | lkm.path_name[PATH_MAX - 1] = '\0'; |
| 380 | |
| 381 | DBG("Sending fd %d to kconsumerd", lkm.fd); |
| 382 | |
| 383 | ret = lttcomm_send_fds_unix_sock(sock, &lkm, &lkm.fd, 1, sizeof(lkm)); |
| 384 | if (ret < 0) { |
| 385 | perror("send kconsumerd fd"); |
| 386 | goto error; |
| 387 | } |
| 388 | } |
| 389 | } |
| 390 | |
| 391 | DBG("Kconsumerd channel fds sent"); |
| 392 | |
| 393 | return 0; |
| 394 | |
| 395 | error: |
| 396 | return ret; |
| 397 | } |
| 398 | |
| 399 | /* |
| 400 | * Send all stream fds of the kernel session to the consumer. |
| 401 | */ |
| 402 | static int send_kconsumerd_fds(struct ltt_kernel_session *session) |
| 403 | { |
| 404 | int ret; |
| 405 | struct ltt_kernel_channel *chan; |
| 406 | struct lttcomm_kconsumerd_header lkh; |
| 407 | struct lttcomm_kconsumerd_msg lkm; |
| 408 | |
| 409 | /* Setup header */ |
| 410 | lkh.payload_size = sizeof(struct lttcomm_kconsumerd_msg); |
| 411 | lkh.cmd_type = ADD_STREAM; |
| 412 | |
| 413 | DBG("Sending kconsumerd header for metadata"); |
| 414 | |
| 415 | ret = lttcomm_send_unix_sock(session->consumer_fd, &lkh, sizeof(struct lttcomm_kconsumerd_header)); |
| 416 | if (ret < 0) { |
| 417 | perror("send kconsumerd header"); |
| 418 | goto error; |
| 419 | } |
| 420 | |
| 421 | DBG("Sending metadata stream fd"); |
| 422 | |
| 423 | /* Extra protection. It's NOT suppose to be set to 0 at this point */ |
| 424 | if (session->consumer_fd == 0) { |
| 425 | session->consumer_fd = kconsumerd_cmd_sock; |
| 426 | } |
| 427 | |
| 428 | if (session->metadata_stream_fd != 0) { |
| 429 | /* Send metadata stream fd first */ |
| 430 | lkm.fd = session->metadata_stream_fd; |
| 431 | lkm.state = ACTIVE_FD; |
| 432 | lkm.max_sb_size = session->metadata->conf->attr.subbuf_size; |
| 433 | lkm.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
| 434 | strncpy(lkm.path_name, session->metadata->pathname, PATH_MAX); |
| 435 | lkm.path_name[PATH_MAX - 1] = '\0'; |
| 436 | |
| 437 | ret = lttcomm_send_fds_unix_sock(session->consumer_fd, &lkm, &lkm.fd, 1, sizeof(lkm)); |
| 438 | if (ret < 0) { |
| 439 | perror("send kconsumerd fd"); |
| 440 | goto error; |
| 441 | } |
| 442 | } |
| 443 | |
| 444 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
| 445 | ret = send_kconsumerd_channel_fds(session->consumer_fd, chan); |
| 446 | if (ret < 0) { |
| 447 | goto error; |
| 448 | } |
| 449 | } |
| 450 | |
| 451 | DBG("Kconsumerd fds (metadata and channel streams) sent"); |
| 452 | |
| 453 | return 0; |
| 454 | |
| 455 | error: |
| 456 | return ret; |
| 457 | } |
| 458 | |
| 459 | /* |
| 460 | * Notify UST applications using the shm mmap futex. |
| 461 | */ |
| 462 | static int notify_ust_apps(int active) |
| 463 | { |
| 464 | char *wait_shm_mmap; |
| 465 | |
| 466 | DBG("Notifying applications of session daemon state: %d", active); |
| 467 | |
| 468 | /* See shm.c for this call implying mmap, shm and futex calls */ |
| 469 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); |
| 470 | if (wait_shm_mmap == NULL) { |
| 471 | goto error; |
| 472 | } |
| 473 | |
| 474 | /* Wake waiting process */ |
| 475 | futex_wait_update((int32_t *) wait_shm_mmap, active); |
| 476 | |
| 477 | /* Apps notified successfully */ |
| 478 | return 0; |
| 479 | |
| 480 | error: |
| 481 | return -1; |
| 482 | } |
| 483 | |
| 484 | /* |
| 485 | * Setup the outgoing data buffer for the response (llm) by allocating the |
| 486 | * right amount of memory and copying the original information from the lsm |
| 487 | * structure. |
| 488 | * |
| 489 | * Return total size of the buffer pointed by buf. |
| 490 | */ |
| 491 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
| 492 | { |
| 493 | int ret, buf_size; |
| 494 | |
| 495 | buf_size = size; |
| 496 | |
| 497 | cmd_ctx->llm = malloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
| 498 | if (cmd_ctx->llm == NULL) { |
| 499 | perror("malloc"); |
| 500 | ret = -ENOMEM; |
| 501 | goto error; |
| 502 | } |
| 503 | |
| 504 | /* Copy common data */ |
| 505 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; |
| 506 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
| 507 | |
| 508 | cmd_ctx->llm->data_size = size; |
| 509 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; |
| 510 | |
| 511 | return buf_size; |
| 512 | |
| 513 | error: |
| 514 | return ret; |
| 515 | } |
| 516 | |
| 517 | /* |
| 518 | * Update the kernel pollfd set of all channel fd available over all tracing |
| 519 | * session. Add the wakeup pipe at the end of the set. |
| 520 | */ |
| 521 | static int update_kernel_pollfd(void) |
| 522 | { |
| 523 | int i = 0; |
| 524 | /* |
| 525 | * The wakup pipe and the quit pipe are needed so the number of fds starts |
| 526 | * at 2 for those pipes. |
| 527 | */ |
| 528 | unsigned int nb_fd = 2; |
| 529 | struct ltt_session *session; |
| 530 | struct ltt_kernel_channel *channel; |
| 531 | |
| 532 | DBG("Updating kernel_pollfd"); |
| 533 | |
| 534 | /* Get the number of channel of all kernel session */ |
| 535 | lock_session_list(); |
| 536 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
| 537 | lock_session(session); |
| 538 | if (session->kernel_session == NULL) { |
| 539 | unlock_session(session); |
| 540 | continue; |
| 541 | } |
| 542 | nb_fd += session->kernel_session->channel_count; |
| 543 | unlock_session(session); |
| 544 | } |
| 545 | |
| 546 | DBG("Resizing kernel_pollfd to size %d", nb_fd); |
| 547 | |
| 548 | kernel_pollfd = realloc(kernel_pollfd, nb_fd * sizeof(struct pollfd)); |
| 549 | if (kernel_pollfd == NULL) { |
| 550 | perror("malloc kernel_pollfd"); |
| 551 | goto error; |
| 552 | } |
| 553 | |
| 554 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
| 555 | lock_session(session); |
| 556 | if (session->kernel_session == NULL) { |
| 557 | unlock_session(session); |
| 558 | continue; |
| 559 | } |
| 560 | if (i >= nb_fd) { |
| 561 | ERR("To much channel for kernel_pollfd size"); |
| 562 | unlock_session(session); |
| 563 | break; |
| 564 | } |
| 565 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { |
| 566 | kernel_pollfd[i].fd = channel->fd; |
| 567 | kernel_pollfd[i].events = POLLIN | POLLRDNORM; |
| 568 | i++; |
| 569 | } |
| 570 | unlock_session(session); |
| 571 | } |
| 572 | unlock_session_list(); |
| 573 | |
| 574 | /* Adding wake up pipe */ |
| 575 | kernel_pollfd[nb_fd - 2].fd = kernel_poll_pipe[0]; |
| 576 | kernel_pollfd[nb_fd - 2].events = POLLIN; |
| 577 | |
| 578 | /* Adding the quit pipe */ |
| 579 | kernel_pollfd[nb_fd - 1].fd = thread_quit_pipe[0]; |
| 580 | |
| 581 | return nb_fd; |
| 582 | |
| 583 | error: |
| 584 | unlock_session_list(); |
| 585 | return -1; |
| 586 | } |
| 587 | |
| 588 | /* |
| 589 | * Find the channel fd from 'fd' over all tracing session. When found, check |
| 590 | * for new channel stream and send those stream fds to the kernel consumer. |
| 591 | * |
| 592 | * Useful for CPU hotplug feature. |
| 593 | */ |
| 594 | static int update_kernel_stream(int fd) |
| 595 | { |
| 596 | int ret = 0; |
| 597 | struct ltt_session *session; |
| 598 | struct ltt_kernel_channel *channel; |
| 599 | |
| 600 | DBG("Updating kernel streams for channel fd %d", fd); |
| 601 | |
| 602 | lock_session_list(); |
| 603 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
| 604 | lock_session(session); |
| 605 | if (session->kernel_session == NULL) { |
| 606 | unlock_session(session); |
| 607 | continue; |
| 608 | } |
| 609 | |
| 610 | /* This is not suppose to be 0 but this is an extra security check */ |
| 611 | if (session->kernel_session->consumer_fd == 0) { |
| 612 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; |
| 613 | } |
| 614 | |
| 615 | cds_list_for_each_entry(channel, &session->kernel_session->channel_list.head, list) { |
| 616 | if (channel->fd == fd) { |
| 617 | DBG("Channel found, updating kernel streams"); |
| 618 | ret = kernel_open_channel_stream(channel); |
| 619 | if (ret < 0) { |
| 620 | goto end; |
| 621 | } |
| 622 | |
| 623 | /* |
| 624 | * Have we already sent fds to the consumer? If yes, it means that |
| 625 | * tracing is started so it is safe to send our updated stream fds. |
| 626 | */ |
| 627 | if (session->kernel_session->kconsumer_fds_sent == 1) { |
| 628 | ret = send_kconsumerd_channel_fds(session->kernel_session->consumer_fd, |
| 629 | channel); |
| 630 | if (ret < 0) { |
| 631 | goto end; |
| 632 | } |
| 633 | } |
| 634 | goto end; |
| 635 | } |
| 636 | } |
| 637 | unlock_session(session); |
| 638 | } |
| 639 | |
| 640 | end: |
| 641 | unlock_session_list(); |
| 642 | if (session) { |
| 643 | unlock_session(session); |
| 644 | } |
| 645 | return ret; |
| 646 | } |
| 647 | |
| 648 | /* |
| 649 | * This thread manage event coming from the kernel. |
| 650 | * |
| 651 | * Features supported in this thread: |
| 652 | * -) CPU Hotplug |
| 653 | */ |
| 654 | static void *thread_manage_kernel(void *data) |
| 655 | { |
| 656 | int ret, i, nb_fd = 0; |
| 657 | char tmp; |
| 658 | int update_poll_flag = 1; |
| 659 | |
| 660 | tracepoint(sessiond_th_kern_start); |
| 661 | |
| 662 | DBG("Thread manage kernel started"); |
| 663 | |
| 664 | while (1) { |
| 665 | if (update_poll_flag == 1) { |
| 666 | nb_fd = update_kernel_pollfd(); |
| 667 | if (nb_fd < 0) { |
| 668 | goto error; |
| 669 | } |
| 670 | update_poll_flag = 0; |
| 671 | } |
| 672 | |
| 673 | DBG("Polling on %d fds", nb_fd); |
| 674 | |
| 675 | tracepoint(sessiond_th_kern_poll); |
| 676 | |
| 677 | /* Poll infinite value of time */ |
| 678 | ret = poll(kernel_pollfd, nb_fd, -1); |
| 679 | if (ret < 0) { |
| 680 | perror("poll kernel thread"); |
| 681 | goto error; |
| 682 | } else if (ret == 0) { |
| 683 | /* Should not happen since timeout is infinite */ |
| 684 | continue; |
| 685 | } |
| 686 | |
| 687 | /* Thread quit pipe has been closed. Killing thread. */ |
| 688 | if (kernel_pollfd[nb_fd - 1].revents == POLLNVAL) { |
| 689 | goto error; |
| 690 | } |
| 691 | |
| 692 | DBG("Kernel poll event triggered"); |
| 693 | |
| 694 | /* |
| 695 | * Check if the wake up pipe was triggered. If so, the kernel_pollfd |
| 696 | * must be updated. |
| 697 | */ |
| 698 | switch (kernel_pollfd[nb_fd - 2].revents) { |
| 699 | case POLLIN: |
| 700 | ret = read(kernel_poll_pipe[0], &tmp, 1); |
| 701 | update_poll_flag = 1; |
| 702 | continue; |
| 703 | case POLLERR: |
| 704 | goto error; |
| 705 | default: |
| 706 | break; |
| 707 | } |
| 708 | |
| 709 | for (i = 0; i < nb_fd; i++) { |
| 710 | switch (kernel_pollfd[i].revents) { |
| 711 | /* |
| 712 | * New CPU detected by the kernel. Adding kernel stream to kernel |
| 713 | * session and updating the kernel consumer |
| 714 | */ |
| 715 | case POLLIN | POLLRDNORM: |
| 716 | ret = update_kernel_stream(kernel_pollfd[i].fd); |
| 717 | if (ret < 0) { |
| 718 | continue; |
| 719 | } |
| 720 | break; |
| 721 | } |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | error: |
| 726 | DBG("Kernel thread dying"); |
| 727 | if (kernel_pollfd) { |
| 728 | free(kernel_pollfd); |
| 729 | } |
| 730 | |
| 731 | close(kernel_poll_pipe[0]); |
| 732 | close(kernel_poll_pipe[1]); |
| 733 | return NULL; |
| 734 | } |
| 735 | |
| 736 | /* |
| 737 | * This thread manage the kconsumerd error sent back to the session daemon. |
| 738 | */ |
| 739 | static void *thread_manage_kconsumerd(void *data) |
| 740 | { |
| 741 | int sock = 0, ret; |
| 742 | enum lttcomm_return_code code; |
| 743 | struct pollfd pollfd[2]; |
| 744 | |
| 745 | tracepoint(sessiond_th_kcon_start); |
| 746 | |
| 747 | DBG("[thread] Manage kconsumerd started"); |
| 748 | |
| 749 | ret = lttcomm_listen_unix_sock(kconsumerd_err_sock); |
| 750 | if (ret < 0) { |
| 751 | goto error; |
| 752 | } |
| 753 | |
| 754 | /* First fd is always the quit pipe */ |
| 755 | pollfd[0].fd = thread_quit_pipe[0]; |
| 756 | |
| 757 | /* Apps socket */ |
| 758 | pollfd[1].fd = kconsumerd_err_sock; |
| 759 | pollfd[1].events = POLLIN; |
| 760 | |
| 761 | tracepoint(sessiond_th_kcon_poll); |
| 762 | |
| 763 | /* Inifinite blocking call, waiting for transmission */ |
| 764 | ret = poll(pollfd, 2, -1); |
| 765 | if (ret < 0) { |
| 766 | perror("poll kconsumerd thread"); |
| 767 | goto error; |
| 768 | } |
| 769 | |
| 770 | /* Thread quit pipe has been closed. Killing thread. */ |
| 771 | if (pollfd[0].revents == POLLNVAL) { |
| 772 | goto error; |
| 773 | } else if (pollfd[1].revents == POLLERR) { |
| 774 | ERR("Kconsumerd err socket poll error"); |
| 775 | goto error; |
| 776 | } |
| 777 | |
| 778 | sock = lttcomm_accept_unix_sock(kconsumerd_err_sock); |
| 779 | if (sock < 0) { |
| 780 | goto error; |
| 781 | } |
| 782 | |
| 783 | /* Getting status code from kconsumerd */ |
| 784 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
| 785 | if (ret <= 0) { |
| 786 | goto error; |
| 787 | } |
| 788 | |
| 789 | if (code == KCONSUMERD_COMMAND_SOCK_READY) { |
| 790 | kconsumerd_cmd_sock = lttcomm_connect_unix_sock(kconsumerd_cmd_unix_sock_path); |
| 791 | if (kconsumerd_cmd_sock < 0) { |
| 792 | sem_post(&kconsumerd_sem); |
| 793 | perror("kconsumerd connect"); |
| 794 | goto error; |
| 795 | } |
| 796 | /* Signal condition to tell that the kconsumerd is ready */ |
| 797 | sem_post(&kconsumerd_sem); |
| 798 | DBG("Kconsumerd command socket ready"); |
| 799 | } else { |
| 800 | DBG("Kconsumerd error when waiting for SOCK_READY : %s", |
| 801 | lttcomm_get_readable_code(-code)); |
| 802 | goto error; |
| 803 | } |
| 804 | |
| 805 | /* Kconsumerd err socket */ |
| 806 | pollfd[1].fd = sock; |
| 807 | pollfd[1].events = POLLIN; |
| 808 | |
| 809 | /* Inifinite blocking call, waiting for transmission */ |
| 810 | ret = poll(pollfd, 2, -1); |
| 811 | if (ret < 0) { |
| 812 | perror("poll kconsumerd thread"); |
| 813 | goto error; |
| 814 | } |
| 815 | |
| 816 | /* Thread quit pipe has been closed. Killing thread. */ |
| 817 | if (pollfd[0].revents == POLLNVAL) { |
| 818 | goto error; |
| 819 | } else if (pollfd[1].revents == POLLERR) { |
| 820 | ERR("Kconsumerd err socket second poll error"); |
| 821 | goto error; |
| 822 | } |
| 823 | |
| 824 | /* Wait for any kconsumerd error */ |
| 825 | ret = lttcomm_recv_unix_sock(sock, &code, sizeof(enum lttcomm_return_code)); |
| 826 | if (ret <= 0) { |
| 827 | ERR("Kconsumerd closed the command socket"); |
| 828 | goto error; |
| 829 | } |
| 830 | |
| 831 | ERR("Kconsumerd return code : %s", lttcomm_get_readable_code(-code)); |
| 832 | |
| 833 | error: |
| 834 | DBG("Kconsumerd thread dying"); |
| 835 | if (kconsumerd_err_sock) { |
| 836 | close(kconsumerd_err_sock); |
| 837 | } |
| 838 | if (kconsumerd_cmd_sock) { |
| 839 | close(kconsumerd_cmd_sock); |
| 840 | } |
| 841 | if (sock) { |
| 842 | close(sock); |
| 843 | } |
| 844 | |
| 845 | unlink(kconsumerd_err_unix_sock_path); |
| 846 | unlink(kconsumerd_cmd_unix_sock_path); |
| 847 | |
| 848 | kconsumerd_pid = 0; |
| 849 | return NULL; |
| 850 | } |
| 851 | |
| 852 | /* |
| 853 | * Reallocate the apps command pollfd structure of nb_fd size. |
| 854 | * |
| 855 | * The first two fds must be there at all time. |
| 856 | */ |
| 857 | static int update_apps_cmd_pollfd(unsigned int nb_fd, unsigned int old_nb_fd, |
| 858 | struct pollfd **pollfd) |
| 859 | { |
| 860 | int i, count; |
| 861 | struct pollfd *old_pollfd = NULL; |
| 862 | |
| 863 | /* Can't accept pollfd less than 2 */ |
| 864 | if (nb_fd < 2) { |
| 865 | goto end; |
| 866 | } |
| 867 | |
| 868 | if (*pollfd) { |
| 869 | /* Save pointer */ |
| 870 | old_pollfd = *pollfd; |
| 871 | } |
| 872 | |
| 873 | *pollfd = malloc(nb_fd * sizeof(struct pollfd)); |
| 874 | if (*pollfd == NULL) { |
| 875 | perror("malloc manage apps pollfd"); |
| 876 | goto error; |
| 877 | } |
| 878 | |
| 879 | /* First fd is always the quit pipe */ |
| 880 | (*pollfd)[0].fd = thread_quit_pipe[0]; |
| 881 | /* Apps command pipe */ |
| 882 | (*pollfd)[1].fd = apps_cmd_pipe[0]; |
| 883 | (*pollfd)[1].events = POLLIN; |
| 884 | |
| 885 | /* Start count after the two pipes below */ |
| 886 | count = 2; |
| 887 | for (i = 2; i < old_nb_fd; i++) { |
| 888 | /* Add to new pollfd */ |
| 889 | if (old_pollfd[i].fd != -1) { |
| 890 | (*pollfd)[count].fd = old_pollfd[i].fd; |
| 891 | (*pollfd)[count].events = POLLHUP | POLLNVAL | POLLERR; |
| 892 | count++; |
| 893 | } |
| 894 | |
| 895 | if (count > nb_fd) { |
| 896 | ERR("Updating poll fd wrong size"); |
| 897 | goto error; |
| 898 | } |
| 899 | } |
| 900 | |
| 901 | /* Destroy old pollfd */ |
| 902 | free(old_pollfd); |
| 903 | |
| 904 | DBG("Apps cmd pollfd realloc of size %d", nb_fd); |
| 905 | |
| 906 | end: |
| 907 | return 0; |
| 908 | |
| 909 | error: |
| 910 | /* Destroy old pollfd */ |
| 911 | free(old_pollfd); |
| 912 | return -1; |
| 913 | } |
| 914 | |
| 915 | /* |
| 916 | * This thread manage application communication. |
| 917 | */ |
| 918 | static void *thread_manage_apps(void *data) |
| 919 | { |
| 920 | int i, ret, count; |
| 921 | unsigned int nb_fd = 2; |
| 922 | int update_poll_flag = 1; |
| 923 | struct pollfd *pollfd = NULL; |
| 924 | struct ust_command ust_cmd; |
| 925 | |
| 926 | DBG("[thread] Manage application started"); |
| 927 | |
| 928 | ust_cmd.sock = -1; |
| 929 | |
| 930 | while (1) { |
| 931 | /* See if we have a valid socket to add to pollfd */ |
| 932 | if (ust_cmd.sock != -1) { |
| 933 | nb_fd++; |
| 934 | update_poll_flag = 1; |
| 935 | } |
| 936 | |
| 937 | /* The pollfd struct must be updated */ |
| 938 | if (update_poll_flag) { |
| 939 | ret = update_apps_cmd_pollfd(nb_fd, ARRAY_SIZE(pollfd), &pollfd); |
| 940 | if (ret < 0) { |
| 941 | /* malloc failed so we quit */ |
| 942 | goto error; |
| 943 | } |
| 944 | |
| 945 | if (ust_cmd.sock != -1) { |
| 946 | /* Update pollfd with the new UST socket */ |
| 947 | DBG("Adding sock %d to apps cmd pollfd", ust_cmd.sock); |
| 948 | pollfd[nb_fd - 1].fd = ust_cmd.sock; |
| 949 | pollfd[nb_fd - 1].events = POLLHUP | POLLNVAL | POLLERR; |
| 950 | ust_cmd.sock = -1; |
| 951 | } |
| 952 | } |
| 953 | |
| 954 | DBG("Apps thread polling on %d fds", nb_fd); |
| 955 | |
| 956 | /* Inifinite blocking call, waiting for transmission */ |
| 957 | ret = poll(pollfd, nb_fd, -1); |
| 958 | if (ret < 0) { |
| 959 | perror("poll apps thread"); |
| 960 | goto error; |
| 961 | } |
| 962 | |
| 963 | /* Thread quit pipe has been closed. Killing thread. */ |
| 964 | if (pollfd[0].revents == POLLNVAL) { |
| 965 | goto error; |
| 966 | } else { |
| 967 | /* apps_cmd_pipe pipe events */ |
| 968 | switch (pollfd[1].revents) { |
| 969 | case POLLERR: |
| 970 | ERR("Apps command pipe poll error"); |
| 971 | goto error; |
| 972 | case POLLIN: |
| 973 | /* Empty pipe */ |
| 974 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); |
| 975 | if (ret < 0 || ret < sizeof(ust_cmd)) { |
| 976 | perror("read apps cmd pipe"); |
| 977 | goto error; |
| 978 | } |
| 979 | |
| 980 | /* Register applicaton to the session daemon */ |
| 981 | ret = register_traceable_app(&ust_cmd.reg_msg, ust_cmd.sock); |
| 982 | if (ret < 0) { |
| 983 | /* Only critical ENOMEM error can be returned here */ |
| 984 | goto error; |
| 985 | } |
| 986 | |
| 987 | ret = ustctl_register_done(ust_cmd.sock); |
| 988 | if (ret < 0) { |
| 989 | /* |
| 990 | * If the registration is not possible, we simply unregister |
| 991 | * the apps and continue |
| 992 | */ |
| 993 | unregister_traceable_app(ust_cmd.sock); |
| 994 | } |
| 995 | break; |
| 996 | } |
| 997 | } |
| 998 | |
| 999 | count = nb_fd; |
| 1000 | for (i = 2; i < count; i++) { |
| 1001 | /* Apps socket is closed/hungup */ |
| 1002 | switch (pollfd[i].revents) { |
| 1003 | case POLLERR: |
| 1004 | case POLLHUP: |
| 1005 | case POLLNVAL: |
| 1006 | /* Pipe closed */ |
| 1007 | unregister_traceable_app(pollfd[i].fd); |
| 1008 | /* Indicate to remove this fd from the pollfd */ |
| 1009 | pollfd[i].fd = -1; |
| 1010 | nb_fd--; |
| 1011 | break; |
| 1012 | } |
| 1013 | } |
| 1014 | |
| 1015 | if (nb_fd != count) { |
| 1016 | update_poll_flag = 1; |
| 1017 | } |
| 1018 | } |
| 1019 | |
| 1020 | error: |
| 1021 | DBG("Application communication apps dying"); |
| 1022 | close(apps_cmd_pipe[0]); |
| 1023 | close(apps_cmd_pipe[1]); |
| 1024 | |
| 1025 | free(pollfd); |
| 1026 | |
| 1027 | return NULL; |
| 1028 | } |
| 1029 | |
| 1030 | /* |
| 1031 | * Dispatch request from the registration threads to the application |
| 1032 | * communication thread. |
| 1033 | */ |
| 1034 | static void *thread_dispatch_ust_registration(void *data) |
| 1035 | { |
| 1036 | int ret; |
| 1037 | struct cds_wfq_node *node; |
| 1038 | struct ust_command *ust_cmd = NULL; |
| 1039 | |
| 1040 | DBG("[thread] Dispatch UST command started"); |
| 1041 | |
| 1042 | while (!dispatch_thread_exit) { |
| 1043 | /* Atomically prepare the queue futex */ |
| 1044 | futex_nto1_prepare(&ust_cmd_queue.futex); |
| 1045 | |
| 1046 | do { |
| 1047 | /* Dequeue command for registration */ |
| 1048 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); |
| 1049 | if (node == NULL) { |
| 1050 | DBG("Waked up but nothing in the UST command queue"); |
| 1051 | /* Continue thread execution */ |
| 1052 | break; |
| 1053 | } |
| 1054 | |
| 1055 | ust_cmd = caa_container_of(node, struct ust_command, node); |
| 1056 | |
| 1057 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
| 1058 | " gid:%d sock:%d name:%s (version %d.%d)", |
| 1059 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, |
| 1060 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, |
| 1061 | ust_cmd->sock, ust_cmd->reg_msg.name, |
| 1062 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); |
| 1063 | /* |
| 1064 | * Inform apps thread of the new application registration. This |
| 1065 | * call is blocking so we can be assured that the data will be read |
| 1066 | * at some point in time or wait to the end of the world :) |
| 1067 | */ |
| 1068 | ret = write(apps_cmd_pipe[1], ust_cmd, |
| 1069 | sizeof(struct ust_command)); |
| 1070 | if (ret < 0) { |
| 1071 | perror("write apps cmd pipe"); |
| 1072 | if (errno == EBADF) { |
| 1073 | /* |
| 1074 | * We can't inform the application thread to process |
| 1075 | * registration. We will exit or else application |
| 1076 | * registration will not occur and tracing will never |
| 1077 | * start. |
| 1078 | */ |
| 1079 | goto error; |
| 1080 | } |
| 1081 | } |
| 1082 | free(ust_cmd); |
| 1083 | } while (node != NULL); |
| 1084 | |
| 1085 | /* Futex wait on queue. Blocking call on futex() */ |
| 1086 | futex_nto1_wait(&ust_cmd_queue.futex); |
| 1087 | } |
| 1088 | |
| 1089 | error: |
| 1090 | DBG("Dispatch thread dying"); |
| 1091 | return NULL; |
| 1092 | } |
| 1093 | |
| 1094 | /* |
| 1095 | * This thread manage application registration. |
| 1096 | */ |
| 1097 | static void *thread_registration_apps(void *data) |
| 1098 | { |
| 1099 | int sock = 0, ret; |
| 1100 | struct pollfd pollfd[2]; |
| 1101 | /* |
| 1102 | * Get allocated in this thread, enqueued to a global queue, dequeued and |
| 1103 | * freed in the manage apps thread. |
| 1104 | */ |
| 1105 | struct ust_command *ust_cmd = NULL; |
| 1106 | |
| 1107 | tracepoint(sessiond_th_apps_start); |
| 1108 | |
| 1109 | DBG("[thread] Manage application registration started"); |
| 1110 | |
| 1111 | ret = lttcomm_listen_unix_sock(apps_sock); |
| 1112 | if (ret < 0) { |
| 1113 | goto error; |
| 1114 | } |
| 1115 | |
| 1116 | /* First fd is always the quit pipe */ |
| 1117 | pollfd[0].fd = thread_quit_pipe[0]; |
| 1118 | |
| 1119 | /* Apps socket */ |
| 1120 | pollfd[1].fd = apps_sock; |
| 1121 | pollfd[1].events = POLLIN; |
| 1122 | |
| 1123 | /* Notify all applications to register */ |
| 1124 | ret = notify_ust_apps(1); |
| 1125 | if (ret < 0) { |
| 1126 | ERR("Failed to notify applications or create the wait shared memory.\n" |
| 1127 | "Execution continues but there might be problem for already running\n" |
| 1128 | "applications that wishes to register."); |
| 1129 | } |
| 1130 | |
| 1131 | while (1) { |
| 1132 | DBG("Accepting application registration"); |
| 1133 | |
| 1134 | tracepoint(sessiond_th_apps_poll); |
| 1135 | |
| 1136 | /* Inifinite blocking call, waiting for transmission */ |
| 1137 | ret = poll(pollfd, 2, -1); |
| 1138 | if (ret < 0) { |
| 1139 | perror("poll register apps thread"); |
| 1140 | goto error; |
| 1141 | } |
| 1142 | |
| 1143 | /* Thread quit pipe has been closed. Killing thread. */ |
| 1144 | if (pollfd[0].revents == POLLNVAL) { |
| 1145 | goto error; |
| 1146 | } else if (pollfd[1].revents == POLLERR) { |
| 1147 | ERR("Register apps socket poll error"); |
| 1148 | goto error; |
| 1149 | } |
| 1150 | |
| 1151 | sock = lttcomm_accept_unix_sock(apps_sock); |
| 1152 | if (sock < 0) { |
| 1153 | goto error; |
| 1154 | } |
| 1155 | |
| 1156 | /* Create UST registration command for enqueuing */ |
| 1157 | ust_cmd = malloc(sizeof(struct ust_command)); |
| 1158 | if (ust_cmd == NULL) { |
| 1159 | perror("ust command malloc"); |
| 1160 | goto error; |
| 1161 | } |
| 1162 | |
| 1163 | /* |
| 1164 | * Using message-based transmissions to ensure we don't have to deal |
| 1165 | * with partially received messages. |
| 1166 | */ |
| 1167 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
| 1168 | sizeof(struct ust_register_msg)); |
| 1169 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { |
| 1170 | if (ret < 0) { |
| 1171 | perror("lttcomm_recv_unix_sock register apps"); |
| 1172 | } else { |
| 1173 | ERR("Wrong size received on apps register"); |
| 1174 | } |
| 1175 | free(ust_cmd); |
| 1176 | close(sock); |
| 1177 | continue; |
| 1178 | } |
| 1179 | |
| 1180 | ust_cmd->sock = sock; |
| 1181 | |
| 1182 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
| 1183 | " gid:%d sock:%d name:%s (version %d.%d)", |
| 1184 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, |
| 1185 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, |
| 1186 | ust_cmd->sock, ust_cmd->reg_msg.name, |
| 1187 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); |
| 1188 | /* |
| 1189 | * Lock free enqueue the registration request. |
| 1190 | * The red pill has been taken! This apps will be part of the *system* |
| 1191 | */ |
| 1192 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); |
| 1193 | |
| 1194 | /* |
| 1195 | * Wake the registration queue futex. |
| 1196 | * Implicit memory barrier with the exchange in cds_wfq_enqueue. |
| 1197 | */ |
| 1198 | futex_nto1_wake(&ust_cmd_queue.futex); |
| 1199 | } |
| 1200 | |
| 1201 | error: |
| 1202 | DBG("UST Registration thread dying"); |
| 1203 | |
| 1204 | /* Notify that the registration thread is gone */ |
| 1205 | notify_ust_apps(0); |
| 1206 | |
| 1207 | close(apps_sock); |
| 1208 | close(sock); |
| 1209 | |
| 1210 | unlink(apps_unix_sock_path); |
| 1211 | |
| 1212 | return NULL; |
| 1213 | } |
| 1214 | |
| 1215 | /* |
| 1216 | * Start the thread_manage_kconsumerd. This must be done after a kconsumerd |
| 1217 | * exec or it will fails. |
| 1218 | */ |
| 1219 | static int spawn_kconsumerd_thread(void) |
| 1220 | { |
| 1221 | int ret; |
| 1222 | |
| 1223 | /* Setup semaphore */ |
| 1224 | sem_init(&kconsumerd_sem, 0, 0); |
| 1225 | |
| 1226 | ret = pthread_create(&kconsumerd_thread, NULL, thread_manage_kconsumerd, (void *) NULL); |
| 1227 | if (ret != 0) { |
| 1228 | perror("pthread_create kconsumerd"); |
| 1229 | goto error; |
| 1230 | } |
| 1231 | |
| 1232 | /* Wait for the kconsumerd thread to be ready */ |
| 1233 | sem_wait(&kconsumerd_sem); |
| 1234 | |
| 1235 | if (kconsumerd_pid == 0) { |
| 1236 | ERR("Kconsumerd did not start"); |
| 1237 | goto error; |
| 1238 | } |
| 1239 | |
| 1240 | return 0; |
| 1241 | |
| 1242 | error: |
| 1243 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
| 1244 | return ret; |
| 1245 | } |
| 1246 | |
| 1247 | /* |
| 1248 | * Join kernel consumer thread |
| 1249 | */ |
| 1250 | static int join_kconsumerd_thread(void) |
| 1251 | { |
| 1252 | void *status; |
| 1253 | int ret; |
| 1254 | |
| 1255 | if (kconsumerd_pid != 0) { |
| 1256 | ret = kill(kconsumerd_pid, SIGTERM); |
| 1257 | if (ret) { |
| 1258 | ERR("Error killing kconsumerd"); |
| 1259 | return ret; |
| 1260 | } |
| 1261 | return pthread_join(kconsumerd_thread, &status); |
| 1262 | } else { |
| 1263 | return 0; |
| 1264 | } |
| 1265 | } |
| 1266 | |
| 1267 | /* |
| 1268 | * Fork and exec a kernel consumer daemon (kconsumerd). |
| 1269 | * |
| 1270 | * Return pid if successful else -1. |
| 1271 | */ |
| 1272 | static pid_t spawn_kconsumerd(void) |
| 1273 | { |
| 1274 | int ret; |
| 1275 | pid_t pid; |
| 1276 | const char *verbosity; |
| 1277 | |
| 1278 | DBG("Spawning kconsumerd"); |
| 1279 | |
| 1280 | pid = fork(); |
| 1281 | if (pid == 0) { |
| 1282 | /* |
| 1283 | * Exec kconsumerd. |
| 1284 | */ |
| 1285 | if (opt_verbose > 1 || opt_verbose_kconsumerd) { |
| 1286 | verbosity = "--verbose"; |
| 1287 | } else { |
| 1288 | verbosity = "--quiet"; |
| 1289 | } |
| 1290 | execl(INSTALL_BIN_PATH "/ltt-kconsumerd", "ltt-kconsumerd", verbosity, NULL); |
| 1291 | if (errno != 0) { |
| 1292 | perror("kernel start consumer exec"); |
| 1293 | } |
| 1294 | exit(EXIT_FAILURE); |
| 1295 | } else if (pid > 0) { |
| 1296 | ret = pid; |
| 1297 | goto error; |
| 1298 | } else { |
| 1299 | perror("kernel start consumer fork"); |
| 1300 | ret = -errno; |
| 1301 | goto error; |
| 1302 | } |
| 1303 | |
| 1304 | error: |
| 1305 | return ret; |
| 1306 | } |
| 1307 | |
| 1308 | /* |
| 1309 | * Spawn the kconsumerd daemon and session daemon thread. |
| 1310 | */ |
| 1311 | static int start_kconsumerd(void) |
| 1312 | { |
| 1313 | int ret; |
| 1314 | |
| 1315 | pthread_mutex_lock(&kconsumerd_pid_mutex); |
| 1316 | if (kconsumerd_pid != 0) { |
| 1317 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
| 1318 | goto end; |
| 1319 | } |
| 1320 | |
| 1321 | ret = spawn_kconsumerd(); |
| 1322 | if (ret < 0) { |
| 1323 | ERR("Spawning kconsumerd failed"); |
| 1324 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
| 1325 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
| 1326 | goto error; |
| 1327 | } |
| 1328 | |
| 1329 | /* Setting up the global kconsumerd_pid */ |
| 1330 | kconsumerd_pid = ret; |
| 1331 | pthread_mutex_unlock(&kconsumerd_pid_mutex); |
| 1332 | |
| 1333 | DBG("Kconsumerd pid %d", ret); |
| 1334 | |
| 1335 | DBG("Spawning kconsumerd thread"); |
| 1336 | ret = spawn_kconsumerd_thread(); |
| 1337 | if (ret < 0) { |
| 1338 | ERR("Fatal error spawning kconsumerd thread"); |
| 1339 | goto error; |
| 1340 | } |
| 1341 | |
| 1342 | end: |
| 1343 | return 0; |
| 1344 | |
| 1345 | error: |
| 1346 | return ret; |
| 1347 | } |
| 1348 | |
| 1349 | /* |
| 1350 | * modprobe_kernel_modules |
| 1351 | */ |
| 1352 | static int modprobe_kernel_modules(void) |
| 1353 | { |
| 1354 | int ret = 0, i; |
| 1355 | char modprobe[256]; |
| 1356 | |
| 1357 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
| 1358 | ret = snprintf(modprobe, sizeof(modprobe), |
| 1359 | "/sbin/modprobe %s%s", |
| 1360 | kernel_modules_list[i].required ? "" : "--quiet ", |
| 1361 | kernel_modules_list[i].name); |
| 1362 | if (ret < 0) { |
| 1363 | perror("snprintf modprobe"); |
| 1364 | goto error; |
| 1365 | } |
| 1366 | modprobe[sizeof(modprobe) - 1] = '\0'; |
| 1367 | ret = system(modprobe); |
| 1368 | if (ret == -1) { |
| 1369 | ERR("Unable to launch modprobe for module %s", |
| 1370 | kernel_modules_list[i].name); |
| 1371 | } else if (kernel_modules_list[i].required |
| 1372 | && WEXITSTATUS(ret) != 0) { |
| 1373 | ERR("Unable to load module %s", |
| 1374 | kernel_modules_list[i].name); |
| 1375 | } else { |
| 1376 | DBG("Modprobe successfully %s", |
| 1377 | kernel_modules_list[i].name); |
| 1378 | } |
| 1379 | } |
| 1380 | |
| 1381 | error: |
| 1382 | return ret; |
| 1383 | } |
| 1384 | |
| 1385 | /* |
| 1386 | * mount_debugfs |
| 1387 | */ |
| 1388 | static int mount_debugfs(char *path) |
| 1389 | { |
| 1390 | int ret; |
| 1391 | char *type = "debugfs"; |
| 1392 | |
| 1393 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
| 1394 | if (ret < 0) { |
| 1395 | goto error; |
| 1396 | } |
| 1397 | |
| 1398 | ret = mount(type, path, type, 0, NULL); |
| 1399 | if (ret < 0) { |
| 1400 | perror("mount debugfs"); |
| 1401 | goto error; |
| 1402 | } |
| 1403 | |
| 1404 | DBG("Mounted debugfs successfully at %s", path); |
| 1405 | |
| 1406 | error: |
| 1407 | return ret; |
| 1408 | } |
| 1409 | |
| 1410 | /* |
| 1411 | * Setup necessary data for kernel tracer action. |
| 1412 | */ |
| 1413 | static void init_kernel_tracer(void) |
| 1414 | { |
| 1415 | int ret; |
| 1416 | char *proc_mounts = "/proc/mounts"; |
| 1417 | char line[256]; |
| 1418 | char *debugfs_path = NULL, *lttng_path; |
| 1419 | FILE *fp; |
| 1420 | |
| 1421 | /* Detect debugfs */ |
| 1422 | fp = fopen(proc_mounts, "r"); |
| 1423 | if (fp == NULL) { |
| 1424 | ERR("Unable to probe %s", proc_mounts); |
| 1425 | goto error; |
| 1426 | } |
| 1427 | |
| 1428 | while (fgets(line, sizeof(line), fp) != NULL) { |
| 1429 | if (strstr(line, "debugfs") != NULL) { |
| 1430 | /* Remove first string */ |
| 1431 | strtok(line, " "); |
| 1432 | /* Dup string here so we can reuse line later on */ |
| 1433 | debugfs_path = strdup(strtok(NULL, " ")); |
| 1434 | DBG("Got debugfs path : %s", debugfs_path); |
| 1435 | break; |
| 1436 | } |
| 1437 | } |
| 1438 | |
| 1439 | fclose(fp); |
| 1440 | |
| 1441 | /* Mount debugfs if needded */ |
| 1442 | if (debugfs_path == NULL) { |
| 1443 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); |
| 1444 | if (ret < 0) { |
| 1445 | perror("asprintf debugfs path"); |
| 1446 | goto error; |
| 1447 | } |
| 1448 | ret = mount_debugfs(debugfs_path); |
| 1449 | if (ret < 0) { |
| 1450 | goto error; |
| 1451 | } |
| 1452 | } |
| 1453 | |
| 1454 | /* Modprobe lttng kernel modules */ |
| 1455 | ret = modprobe_kernel_modules(); |
| 1456 | if (ret < 0) { |
| 1457 | goto error; |
| 1458 | } |
| 1459 | |
| 1460 | /* Setup lttng kernel path */ |
| 1461 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); |
| 1462 | if (ret < 0) { |
| 1463 | perror("asprintf lttng path"); |
| 1464 | goto error; |
| 1465 | } |
| 1466 | |
| 1467 | /* Open debugfs lttng */ |
| 1468 | kernel_tracer_fd = open(lttng_path, O_RDWR); |
| 1469 | if (kernel_tracer_fd < 0) { |
| 1470 | DBG("Failed to open %s", lttng_path); |
| 1471 | goto error; |
| 1472 | } |
| 1473 | |
| 1474 | free(lttng_path); |
| 1475 | free(debugfs_path); |
| 1476 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
| 1477 | return; |
| 1478 | |
| 1479 | error: |
| 1480 | if (lttng_path) { |
| 1481 | free(lttng_path); |
| 1482 | } |
| 1483 | if (debugfs_path) { |
| 1484 | free(debugfs_path); |
| 1485 | } |
| 1486 | WARN("No kernel tracer available"); |
| 1487 | kernel_tracer_fd = 0; |
| 1488 | return; |
| 1489 | } |
| 1490 | |
| 1491 | /* |
| 1492 | * Start tracing by creating trace directory and sending FDs to the kernel |
| 1493 | * consumer. |
| 1494 | */ |
| 1495 | static int start_kernel_trace(struct ltt_kernel_session *session) |
| 1496 | { |
| 1497 | int ret = 0; |
| 1498 | |
| 1499 | if (session->kconsumer_fds_sent == 0) { |
| 1500 | /* |
| 1501 | * Assign default kernel consumer if no consumer assigned to the kernel |
| 1502 | * session. At this point, it's NOT suppose to be 0 but this is an extra |
| 1503 | * security check. |
| 1504 | */ |
| 1505 | if (session->consumer_fd == 0) { |
| 1506 | session->consumer_fd = kconsumerd_cmd_sock; |
| 1507 | } |
| 1508 | |
| 1509 | ret = send_kconsumerd_fds(session); |
| 1510 | if (ret < 0) { |
| 1511 | ERR("Send kconsumerd fds failed"); |
| 1512 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
| 1513 | goto error; |
| 1514 | } |
| 1515 | |
| 1516 | session->kconsumer_fds_sent = 1; |
| 1517 | } |
| 1518 | |
| 1519 | error: |
| 1520 | return ret; |
| 1521 | } |
| 1522 | |
| 1523 | /* |
| 1524 | * Notify kernel thread to update it's pollfd. |
| 1525 | */ |
| 1526 | static int notify_kernel_pollfd(void) |
| 1527 | { |
| 1528 | int ret; |
| 1529 | |
| 1530 | /* Inform kernel thread of the new kernel channel */ |
| 1531 | ret = write(kernel_poll_pipe[1], "!", 1); |
| 1532 | if (ret < 0) { |
| 1533 | perror("write kernel poll pipe"); |
| 1534 | } |
| 1535 | |
| 1536 | return ret; |
| 1537 | } |
| 1538 | |
| 1539 | /* |
| 1540 | * Allocate a channel structure and fill it. |
| 1541 | */ |
| 1542 | static struct lttng_channel *init_default_channel(enum lttng_domain_type domain_type, |
| 1543 | char *name) |
| 1544 | { |
| 1545 | struct lttng_channel *chan; |
| 1546 | |
| 1547 | chan = malloc(sizeof(struct lttng_channel)); |
| 1548 | if (chan == NULL) { |
| 1549 | perror("init channel malloc"); |
| 1550 | goto error; |
| 1551 | } |
| 1552 | |
| 1553 | if (snprintf(chan->name, NAME_MAX, "%s", name) < 0) { |
| 1554 | perror("snprintf channel name"); |
| 1555 | goto error; |
| 1556 | } |
| 1557 | |
| 1558 | chan->attr.overwrite = DEFAULT_CHANNEL_OVERWRITE; |
| 1559 | chan->attr.switch_timer_interval = DEFAULT_CHANNEL_SWITCH_TIMER; |
| 1560 | chan->attr.read_timer_interval = DEFAULT_CHANNEL_READ_TIMER; |
| 1561 | |
| 1562 | switch (domain_type) { |
| 1563 | case LTTNG_DOMAIN_KERNEL: |
| 1564 | chan->attr.subbuf_size = DEFAULT_KERNEL_CHANNEL_SUBBUF_SIZE; |
| 1565 | chan->attr.num_subbuf = DEFAULT_KERNEL_CHANNEL_SUBBUF_NUM; |
| 1566 | chan->attr.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
| 1567 | break; |
| 1568 | /* TODO: add UST */ |
| 1569 | default: |
| 1570 | goto error; /* Not implemented */ |
| 1571 | } |
| 1572 | |
| 1573 | return chan; |
| 1574 | |
| 1575 | error: |
| 1576 | free(chan); |
| 1577 | return NULL; |
| 1578 | } |
| 1579 | |
| 1580 | /* |
| 1581 | * Create an UST session and add it to the session ust list. |
| 1582 | */ |
| 1583 | static int create_ust_session(pid_t pid, struct ltt_session *session) |
| 1584 | { |
| 1585 | int ret = -1; |
| 1586 | struct ltt_ust_session *lus; |
| 1587 | |
| 1588 | DBG("Creating UST session"); |
| 1589 | |
| 1590 | lus = trace_ust_create_session(session->path, pid); |
| 1591 | if (lus == NULL) { |
| 1592 | goto error; |
| 1593 | } |
| 1594 | |
| 1595 | ret = mkdir_recursive(lus->path, S_IRWXU | S_IRWXG, |
| 1596 | geteuid(), allowed_group()); |
| 1597 | if (ret < 0) { |
| 1598 | if (ret != -EEXIST) { |
| 1599 | ERR("Trace directory creation error"); |
| 1600 | goto error; |
| 1601 | } |
| 1602 | } |
| 1603 | |
| 1604 | /* Create session on the UST tracer */ |
| 1605 | ret = ustctl_create_session(lus); |
| 1606 | if (ret < 0) { |
| 1607 | goto error; |
| 1608 | } |
| 1609 | |
| 1610 | return 0; |
| 1611 | |
| 1612 | error: |
| 1613 | free(lus); |
| 1614 | return ret; |
| 1615 | } |
| 1616 | |
| 1617 | /* |
| 1618 | * Create a kernel tracer session then create the default channel. |
| 1619 | */ |
| 1620 | static int create_kernel_session(struct ltt_session *session) |
| 1621 | { |
| 1622 | int ret; |
| 1623 | |
| 1624 | DBG("Creating kernel session"); |
| 1625 | |
| 1626 | ret = kernel_create_session(session, kernel_tracer_fd); |
| 1627 | if (ret < 0) { |
| 1628 | ret = LTTCOMM_KERN_SESS_FAIL; |
| 1629 | goto error; |
| 1630 | } |
| 1631 | |
| 1632 | /* Set kernel consumer socket fd */ |
| 1633 | if (kconsumerd_cmd_sock) { |
| 1634 | session->kernel_session->consumer_fd = kconsumerd_cmd_sock; |
| 1635 | } |
| 1636 | |
| 1637 | ret = mkdir_recursive(session->kernel_session->trace_path, |
| 1638 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); |
| 1639 | if (ret < 0) { |
| 1640 | if (ret != -EEXIST) { |
| 1641 | ERR("Trace directory creation error"); |
| 1642 | goto error; |
| 1643 | } |
| 1644 | } |
| 1645 | |
| 1646 | error: |
| 1647 | return ret; |
| 1648 | } |
| 1649 | |
| 1650 | /* |
| 1651 | * Using the session list, filled a lttng_session array to send back to the |
| 1652 | * client for session listing. |
| 1653 | * |
| 1654 | * The session list lock MUST be acquired before calling this function. Use |
| 1655 | * lock_session_list() and unlock_session_list(). |
| 1656 | */ |
| 1657 | static void list_lttng_sessions(struct lttng_session *sessions) |
| 1658 | { |
| 1659 | int i = 0; |
| 1660 | struct ltt_session *session; |
| 1661 | |
| 1662 | DBG("Getting all available session"); |
| 1663 | /* |
| 1664 | * Iterate over session list and append data after the control struct in |
| 1665 | * the buffer. |
| 1666 | */ |
| 1667 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
| 1668 | strncpy(sessions[i].path, session->path, PATH_MAX); |
| 1669 | sessions[i].path[PATH_MAX - 1] = '\0'; |
| 1670 | strncpy(sessions[i].name, session->name, NAME_MAX); |
| 1671 | sessions[i].name[NAME_MAX - 1] = '\0'; |
| 1672 | i++; |
| 1673 | } |
| 1674 | } |
| 1675 | |
| 1676 | /* |
| 1677 | * Fill lttng_channel array of all channels. |
| 1678 | */ |
| 1679 | static void list_lttng_channels(struct ltt_session *session, |
| 1680 | struct lttng_channel *channels) |
| 1681 | { |
| 1682 | int i = 0; |
| 1683 | struct ltt_kernel_channel *kchan; |
| 1684 | |
| 1685 | DBG("Listing channels for session %s", session->name); |
| 1686 | |
| 1687 | /* Kernel channels */ |
| 1688 | if (session->kernel_session != NULL) { |
| 1689 | cds_list_for_each_entry(kchan, &session->kernel_session->channel_list.head, list) { |
| 1690 | /* Copy lttng_channel struct to array */ |
| 1691 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); |
| 1692 | channels[i].enabled = kchan->enabled; |
| 1693 | i++; |
| 1694 | } |
| 1695 | } |
| 1696 | |
| 1697 | /* TODO: Missing UST listing */ |
| 1698 | } |
| 1699 | |
| 1700 | /* |
| 1701 | * Fill lttng_event array of all events in the channel. |
| 1702 | */ |
| 1703 | static void list_lttng_events(struct ltt_kernel_channel *kchan, |
| 1704 | struct lttng_event *events) |
| 1705 | { |
| 1706 | /* |
| 1707 | * TODO: This is ONLY kernel. Need UST support. |
| 1708 | */ |
| 1709 | int i = 0; |
| 1710 | struct ltt_kernel_event *event; |
| 1711 | |
| 1712 | DBG("Listing events for channel %s", kchan->channel->name); |
| 1713 | |
| 1714 | /* Kernel channels */ |
| 1715 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { |
| 1716 | strncpy(events[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
| 1717 | events[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
| 1718 | events[i].enabled = event->enabled; |
| 1719 | switch (event->event->instrumentation) { |
| 1720 | case LTTNG_KERNEL_TRACEPOINT: |
| 1721 | events[i].type = LTTNG_EVENT_TRACEPOINT; |
| 1722 | break; |
| 1723 | case LTTNG_KERNEL_KPROBE: |
| 1724 | case LTTNG_KERNEL_KRETPROBE: |
| 1725 | events[i].type = LTTNG_EVENT_PROBE; |
| 1726 | memcpy(&events[i].attr.probe, &event->event->u.kprobe, |
| 1727 | sizeof(struct lttng_kernel_kprobe)); |
| 1728 | break; |
| 1729 | case LTTNG_KERNEL_FUNCTION: |
| 1730 | events[i].type = LTTNG_EVENT_FUNCTION; |
| 1731 | memcpy(&events[i].attr.ftrace, &event->event->u.ftrace, |
| 1732 | sizeof(struct lttng_kernel_function)); |
| 1733 | break; |
| 1734 | } |
| 1735 | i++; |
| 1736 | } |
| 1737 | } |
| 1738 | |
| 1739 | /* |
| 1740 | * Process the command requested by the lttng client within the command |
| 1741 | * context structure. This function make sure that the return structure (llm) |
| 1742 | * is set and ready for transmission before returning. |
| 1743 | * |
| 1744 | * Return any error encountered or 0 for success. |
| 1745 | */ |
| 1746 | static int process_client_msg(struct command_ctx *cmd_ctx) |
| 1747 | { |
| 1748 | int ret = LTTCOMM_OK; |
| 1749 | |
| 1750 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
| 1751 | |
| 1752 | /* |
| 1753 | * Commands that DO NOT need a session. |
| 1754 | */ |
| 1755 | switch (cmd_ctx->lsm->cmd_type) { |
| 1756 | case LTTNG_CREATE_SESSION: |
| 1757 | case LTTNG_LIST_SESSIONS: |
| 1758 | case LTTNG_LIST_TRACEPOINTS: |
| 1759 | case LTTNG_CALIBRATE: |
| 1760 | break; |
| 1761 | default: |
| 1762 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); |
| 1763 | cmd_ctx->session = find_session_by_name(cmd_ctx->lsm->session.name); |
| 1764 | if (cmd_ctx->session == NULL) { |
| 1765 | /* If session name not found */ |
| 1766 | if (cmd_ctx->lsm->session.name != NULL) { |
| 1767 | ret = LTTCOMM_SESS_NOT_FOUND; |
| 1768 | } else { /* If no session name specified */ |
| 1769 | ret = LTTCOMM_SELECT_SESS; |
| 1770 | } |
| 1771 | goto error; |
| 1772 | } else { |
| 1773 | /* Acquire lock for the session */ |
| 1774 | lock_session(cmd_ctx->session); |
| 1775 | } |
| 1776 | break; |
| 1777 | } |
| 1778 | |
| 1779 | /* |
| 1780 | * Check domain type for specific "pre-action". |
| 1781 | */ |
| 1782 | switch (cmd_ctx->lsm->domain.type) { |
| 1783 | case LTTNG_DOMAIN_KERNEL: |
| 1784 | /* Kernel tracer check */ |
| 1785 | if (kernel_tracer_fd == 0) { |
| 1786 | init_kernel_tracer(); |
| 1787 | if (kernel_tracer_fd == 0) { |
| 1788 | ret = LTTCOMM_KERN_NA; |
| 1789 | goto error; |
| 1790 | } |
| 1791 | } |
| 1792 | /* Need a session for kernel command */ |
| 1793 | switch (cmd_ctx->lsm->cmd_type) { |
| 1794 | case LTTNG_CALIBRATE: |
| 1795 | case LTTNG_CREATE_SESSION: |
| 1796 | case LTTNG_LIST_SESSIONS: |
| 1797 | case LTTNG_LIST_TRACEPOINTS: |
| 1798 | break; |
| 1799 | default: |
| 1800 | if (cmd_ctx->session->kernel_session == NULL) { |
| 1801 | ret = create_kernel_session(cmd_ctx->session); |
| 1802 | if (ret < 0) { |
| 1803 | ret = LTTCOMM_KERN_SESS_FAIL; |
| 1804 | goto error; |
| 1805 | } |
| 1806 | /* Start the kernel consumer daemon */ |
| 1807 | if (kconsumerd_pid == 0 && |
| 1808 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
| 1809 | ret = start_kconsumerd(); |
| 1810 | if (ret < 0) { |
| 1811 | goto error; |
| 1812 | } |
| 1813 | } |
| 1814 | } |
| 1815 | } |
| 1816 | break; |
| 1817 | case LTTNG_DOMAIN_UST_PID: |
| 1818 | break; |
| 1819 | default: |
| 1820 | break; |
| 1821 | } |
| 1822 | |
| 1823 | /* Process by command type */ |
| 1824 | switch (cmd_ctx->lsm->cmd_type) { |
| 1825 | case LTTNG_ADD_CONTEXT: |
| 1826 | { |
| 1827 | struct lttng_kernel_context kctx; |
| 1828 | |
| 1829 | /* Setup lttng message with no payload */ |
| 1830 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 1831 | if (ret < 0) { |
| 1832 | goto setup_error; |
| 1833 | } |
| 1834 | |
| 1835 | switch (cmd_ctx->lsm->domain.type) { |
| 1836 | case LTTNG_DOMAIN_KERNEL: |
| 1837 | /* Create Kernel context */ |
| 1838 | kctx.ctx = cmd_ctx->lsm->u.context.ctx.ctx; |
| 1839 | kctx.u.perf_counter.type = cmd_ctx->lsm->u.context.ctx.u.perf_counter.type; |
| 1840 | kctx.u.perf_counter.config = cmd_ctx->lsm->u.context.ctx.u.perf_counter.config; |
| 1841 | strncpy(kctx.u.perf_counter.name, |
| 1842 | cmd_ctx->lsm->u.context.ctx.u.perf_counter.name, |
| 1843 | LTTNG_SYMBOL_NAME_LEN); |
| 1844 | kctx.u.perf_counter.name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
| 1845 | |
| 1846 | /* Add kernel context to kernel tracer. See context.c */ |
| 1847 | ret = add_kernel_context(cmd_ctx->session->kernel_session, &kctx, |
| 1848 | cmd_ctx->lsm->u.context.event_name, |
| 1849 | cmd_ctx->lsm->u.context.channel_name); |
| 1850 | if (ret != LTTCOMM_OK) { |
| 1851 | goto error; |
| 1852 | } |
| 1853 | break; |
| 1854 | default: |
| 1855 | /* TODO: Userspace tracing */ |
| 1856 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 1857 | goto error; |
| 1858 | } |
| 1859 | |
| 1860 | ret = LTTCOMM_OK; |
| 1861 | break; |
| 1862 | } |
| 1863 | case LTTNG_DISABLE_CHANNEL: |
| 1864 | { |
| 1865 | struct ltt_kernel_channel *kchan; |
| 1866 | |
| 1867 | /* Setup lttng message with no payload */ |
| 1868 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 1869 | if (ret < 0) { |
| 1870 | goto setup_error; |
| 1871 | } |
| 1872 | |
| 1873 | switch (cmd_ctx->lsm->domain.type) { |
| 1874 | case LTTNG_DOMAIN_KERNEL: |
| 1875 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
| 1876 | cmd_ctx->session->kernel_session); |
| 1877 | if (kchan == NULL) { |
| 1878 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; |
| 1879 | goto error; |
| 1880 | } else if (kchan->enabled == 1) { |
| 1881 | ret = kernel_disable_channel(kchan); |
| 1882 | if (ret < 0) { |
| 1883 | if (ret != EEXIST) { |
| 1884 | ret = LTTCOMM_KERN_CHAN_DISABLE_FAIL; |
| 1885 | } |
| 1886 | goto error; |
| 1887 | } |
| 1888 | } |
| 1889 | kernel_wait_quiescent(kernel_tracer_fd); |
| 1890 | break; |
| 1891 | default: |
| 1892 | /* TODO: Userspace tracing */ |
| 1893 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 1894 | goto error; |
| 1895 | } |
| 1896 | |
| 1897 | ret = LTTCOMM_OK; |
| 1898 | break; |
| 1899 | } |
| 1900 | case LTTNG_DISABLE_EVENT: |
| 1901 | { |
| 1902 | struct ltt_kernel_channel *kchan; |
| 1903 | struct ltt_kernel_event *kevent; |
| 1904 | |
| 1905 | /* Setup lttng message with no payload */ |
| 1906 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 1907 | if (ret < 0) { |
| 1908 | goto setup_error; |
| 1909 | } |
| 1910 | |
| 1911 | switch (cmd_ctx->lsm->domain.type) { |
| 1912 | case LTTNG_DOMAIN_KERNEL: |
| 1913 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
| 1914 | cmd_ctx->session->kernel_session); |
| 1915 | if (kchan == NULL) { |
| 1916 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; |
| 1917 | goto error; |
| 1918 | } |
| 1919 | |
| 1920 | kevent = trace_kernel_get_event_by_name(cmd_ctx->lsm->u.disable.name, kchan); |
| 1921 | if (kevent != NULL) { |
| 1922 | DBG("Disabling kernel event %s for channel %s.", kevent->event->name, |
| 1923 | kchan->channel->name); |
| 1924 | ret = kernel_disable_event(kevent); |
| 1925 | if (ret < 0) { |
| 1926 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
| 1927 | goto error; |
| 1928 | } |
| 1929 | } |
| 1930 | |
| 1931 | kernel_wait_quiescent(kernel_tracer_fd); |
| 1932 | break; |
| 1933 | default: |
| 1934 | /* TODO: Userspace tracing */ |
| 1935 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 1936 | goto error; |
| 1937 | } |
| 1938 | |
| 1939 | ret = LTTCOMM_OK; |
| 1940 | break; |
| 1941 | } |
| 1942 | case LTTNG_DISABLE_ALL_EVENT: |
| 1943 | { |
| 1944 | struct ltt_kernel_channel *kchan; |
| 1945 | struct ltt_kernel_event *kevent; |
| 1946 | |
| 1947 | /* Setup lttng message with no payload */ |
| 1948 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 1949 | if (ret < 0) { |
| 1950 | goto setup_error; |
| 1951 | } |
| 1952 | |
| 1953 | switch (cmd_ctx->lsm->domain.type) { |
| 1954 | case LTTNG_DOMAIN_KERNEL: |
| 1955 | DBG("Disabling all enabled kernel events"); |
| 1956 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.disable.channel_name, |
| 1957 | cmd_ctx->session->kernel_session); |
| 1958 | if (kchan == NULL) { |
| 1959 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; |
| 1960 | goto error; |
| 1961 | } |
| 1962 | |
| 1963 | /* For each event in the kernel session */ |
| 1964 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { |
| 1965 | DBG("Disabling kernel event %s for channel %s.", |
| 1966 | kevent->event->name, kchan->channel->name); |
| 1967 | ret = kernel_disable_event(kevent); |
| 1968 | if (ret < 0) { |
| 1969 | continue; |
| 1970 | } |
| 1971 | } |
| 1972 | |
| 1973 | /* Quiescent wait after event disable */ |
| 1974 | kernel_wait_quiescent(kernel_tracer_fd); |
| 1975 | break; |
| 1976 | default: |
| 1977 | /* TODO: Userspace tracing */ |
| 1978 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 1979 | goto error; |
| 1980 | } |
| 1981 | |
| 1982 | ret = LTTCOMM_OK; |
| 1983 | break; |
| 1984 | } |
| 1985 | case LTTNG_ENABLE_CHANNEL: |
| 1986 | { |
| 1987 | struct ltt_kernel_channel *kchan; |
| 1988 | |
| 1989 | /* Setup lttng message with no payload */ |
| 1990 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 1991 | if (ret < 0) { |
| 1992 | goto setup_error; |
| 1993 | } |
| 1994 | |
| 1995 | switch (cmd_ctx->lsm->domain.type) { |
| 1996 | case LTTNG_DOMAIN_KERNEL: |
| 1997 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.enable.channel_name, |
| 1998 | cmd_ctx->session->kernel_session); |
| 1999 | if (kchan == NULL) { |
| 2000 | /* Channel not found, creating it */ |
| 2001 | DBG("Creating kernel channel"); |
| 2002 | |
| 2003 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
| 2004 | &cmd_ctx->lsm->u.channel.chan, |
| 2005 | cmd_ctx->session->kernel_session->trace_path); |
| 2006 | if (ret < 0) { |
| 2007 | ret = LTTCOMM_KERN_CHAN_FAIL; |
| 2008 | goto error; |
| 2009 | } |
| 2010 | |
| 2011 | /* Notify kernel thread that there is a new channel */ |
| 2012 | ret = notify_kernel_pollfd(); |
| 2013 | if (ret < 0) { |
| 2014 | ret = LTTCOMM_FATAL; |
| 2015 | goto error; |
| 2016 | } |
| 2017 | } else if (kchan->enabled == 0) { |
| 2018 | ret = kernel_enable_channel(kchan); |
| 2019 | if (ret < 0) { |
| 2020 | if (ret != EEXIST) { |
| 2021 | ret = LTTCOMM_KERN_CHAN_ENABLE_FAIL; |
| 2022 | } |
| 2023 | goto error; |
| 2024 | } |
| 2025 | } |
| 2026 | |
| 2027 | kernel_wait_quiescent(kernel_tracer_fd); |
| 2028 | break; |
| 2029 | case LTTNG_DOMAIN_UST_PID: |
| 2030 | |
| 2031 | break; |
| 2032 | default: |
| 2033 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2034 | goto error; |
| 2035 | } |
| 2036 | |
| 2037 | ret = LTTCOMM_OK; |
| 2038 | break; |
| 2039 | } |
| 2040 | case LTTNG_ENABLE_EVENT: |
| 2041 | { |
| 2042 | char *channel_name; |
| 2043 | struct ltt_kernel_channel *kchan; |
| 2044 | struct ltt_kernel_event *kevent; |
| 2045 | struct lttng_channel *chan; |
| 2046 | |
| 2047 | /* Setup lttng message with no payload */ |
| 2048 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 2049 | if (ret < 0) { |
| 2050 | goto setup_error; |
| 2051 | } |
| 2052 | |
| 2053 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
| 2054 | |
| 2055 | switch (cmd_ctx->lsm->domain.type) { |
| 2056 | case LTTNG_DOMAIN_KERNEL: |
| 2057 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 2058 | cmd_ctx->session->kernel_session); |
| 2059 | if (kchan == NULL) { |
| 2060 | DBG("Channel not found. Creating channel %s", channel_name); |
| 2061 | |
| 2062 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); |
| 2063 | if (chan == NULL) { |
| 2064 | ret = LTTCOMM_FATAL; |
| 2065 | goto error; |
| 2066 | } |
| 2067 | |
| 2068 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
| 2069 | chan, cmd_ctx->session->kernel_session->trace_path); |
| 2070 | if (ret < 0) { |
| 2071 | ret = LTTCOMM_KERN_CHAN_FAIL; |
| 2072 | goto error; |
| 2073 | } |
| 2074 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 2075 | cmd_ctx->session->kernel_session); |
| 2076 | if (kchan == NULL) { |
| 2077 | ERR("Channel %s not found after creation. Internal error, giving up.", |
| 2078 | channel_name); |
| 2079 | ret = LTTCOMM_FATAL; |
| 2080 | goto error; |
| 2081 | } |
| 2082 | } |
| 2083 | |
| 2084 | kevent = trace_kernel_get_event_by_name(cmd_ctx->lsm->u.enable.event.name, kchan); |
| 2085 | if (kevent == NULL) { |
| 2086 | DBG("Creating kernel event %s for channel %s.", |
| 2087 | cmd_ctx->lsm->u.enable.event.name, channel_name); |
| 2088 | ret = kernel_create_event(&cmd_ctx->lsm->u.enable.event, kchan); |
| 2089 | } else { |
| 2090 | DBG("Enabling kernel event %s for channel %s.", |
| 2091 | kevent->event->name, channel_name); |
| 2092 | ret = kernel_enable_event(kevent); |
| 2093 | if (ret == -EEXIST) { |
| 2094 | ret = LTTCOMM_KERN_EVENT_EXIST; |
| 2095 | goto error; |
| 2096 | } |
| 2097 | } |
| 2098 | |
| 2099 | if (ret < 0) { |
| 2100 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
| 2101 | goto error; |
| 2102 | } |
| 2103 | |
| 2104 | kernel_wait_quiescent(kernel_tracer_fd); |
| 2105 | break; |
| 2106 | default: |
| 2107 | /* TODO: Userspace tracing */ |
| 2108 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2109 | goto error; |
| 2110 | } |
| 2111 | ret = LTTCOMM_OK; |
| 2112 | break; |
| 2113 | } |
| 2114 | case LTTNG_ENABLE_ALL_EVENT: |
| 2115 | { |
| 2116 | int size, i; |
| 2117 | char *channel_name; |
| 2118 | struct ltt_kernel_channel *kchan; |
| 2119 | struct ltt_kernel_event *kevent; |
| 2120 | struct lttng_event *event_list; |
| 2121 | struct lttng_channel *chan; |
| 2122 | |
| 2123 | /* Setup lttng message with no payload */ |
| 2124 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 2125 | if (ret < 0) { |
| 2126 | goto setup_error; |
| 2127 | } |
| 2128 | |
| 2129 | DBG("Enabling all kernel event"); |
| 2130 | |
| 2131 | channel_name = cmd_ctx->lsm->u.enable.channel_name; |
| 2132 | |
| 2133 | switch (cmd_ctx->lsm->domain.type) { |
| 2134 | case LTTNG_DOMAIN_KERNEL: |
| 2135 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 2136 | cmd_ctx->session->kernel_session); |
| 2137 | if (kchan == NULL) { |
| 2138 | DBG("Channel not found. Creating channel %s", channel_name); |
| 2139 | |
| 2140 | chan = init_default_channel(cmd_ctx->lsm->domain.type, channel_name); |
| 2141 | if (chan == NULL) { |
| 2142 | ret = LTTCOMM_FATAL; |
| 2143 | goto error; |
| 2144 | } |
| 2145 | |
| 2146 | ret = kernel_create_channel(cmd_ctx->session->kernel_session, |
| 2147 | chan, cmd_ctx->session->kernel_session->trace_path); |
| 2148 | if (ret < 0) { |
| 2149 | ret = LTTCOMM_KERN_CHAN_FAIL; |
| 2150 | goto error; |
| 2151 | } |
| 2152 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 2153 | cmd_ctx->session->kernel_session); |
| 2154 | if (kchan == NULL) { |
| 2155 | ERR("Channel %s not found after creation. Internal error, giving up.", |
| 2156 | channel_name); |
| 2157 | ret = LTTCOMM_FATAL; |
| 2158 | goto error; |
| 2159 | } |
| 2160 | } |
| 2161 | |
| 2162 | /* For each event in the kernel session */ |
| 2163 | cds_list_for_each_entry(kevent, &kchan->events_list.head, list) { |
| 2164 | DBG("Enabling kernel event %s for channel %s.", |
| 2165 | kevent->event->name, channel_name); |
| 2166 | ret = kernel_enable_event(kevent); |
| 2167 | if (ret < 0) { |
| 2168 | continue; |
| 2169 | } |
| 2170 | } |
| 2171 | |
| 2172 | size = kernel_list_events(kernel_tracer_fd, &event_list); |
| 2173 | if (size < 0) { |
| 2174 | ret = LTTCOMM_KERN_LIST_FAIL; |
| 2175 | goto error; |
| 2176 | } |
| 2177 | |
| 2178 | for (i = 0; i < size; i++) { |
| 2179 | kevent = trace_kernel_get_event_by_name(event_list[i].name, kchan); |
| 2180 | if (kevent == NULL) { |
| 2181 | /* Default event type for enable all */ |
| 2182 | event_list[i].type = LTTNG_EVENT_TRACEPOINT; |
| 2183 | /* Enable each single tracepoint event */ |
| 2184 | ret = kernel_create_event(&event_list[i], kchan); |
| 2185 | if (ret < 0) { |
| 2186 | /* Ignore error here and continue */ |
| 2187 | } |
| 2188 | } |
| 2189 | } |
| 2190 | |
| 2191 | free(event_list); |
| 2192 | |
| 2193 | /* Quiescent wait after event enable */ |
| 2194 | kernel_wait_quiescent(kernel_tracer_fd); |
| 2195 | break; |
| 2196 | default: |
| 2197 | /* TODO: Userspace tracing */ |
| 2198 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2199 | goto error; |
| 2200 | } |
| 2201 | |
| 2202 | ret = LTTCOMM_OK; |
| 2203 | break; |
| 2204 | } |
| 2205 | case LTTNG_LIST_TRACEPOINTS: |
| 2206 | { |
| 2207 | struct lttng_event *events; |
| 2208 | ssize_t nb_events = 0; |
| 2209 | |
| 2210 | switch (cmd_ctx->lsm->domain.type) { |
| 2211 | case LTTNG_DOMAIN_KERNEL: |
| 2212 | DBG("Listing kernel events"); |
| 2213 | nb_events = kernel_list_events(kernel_tracer_fd, &events); |
| 2214 | if (nb_events < 0) { |
| 2215 | ret = LTTCOMM_KERN_LIST_FAIL; |
| 2216 | goto error; |
| 2217 | } |
| 2218 | break; |
| 2219 | default: |
| 2220 | /* TODO: Userspace listing */ |
| 2221 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2222 | break; |
| 2223 | } |
| 2224 | |
| 2225 | /* |
| 2226 | * Setup lttng message with payload size set to the event list size in |
| 2227 | * bytes and then copy list into the llm payload. |
| 2228 | */ |
| 2229 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
| 2230 | if (ret < 0) { |
| 2231 | free(events); |
| 2232 | goto setup_error; |
| 2233 | } |
| 2234 | |
| 2235 | /* Copy event list into message payload */ |
| 2236 | memcpy(cmd_ctx->llm->payload, events, |
| 2237 | sizeof(struct lttng_event) * nb_events); |
| 2238 | |
| 2239 | free(events); |
| 2240 | |
| 2241 | ret = LTTCOMM_OK; |
| 2242 | break; |
| 2243 | } |
| 2244 | case LTTNG_START_TRACE: |
| 2245 | { |
| 2246 | struct ltt_kernel_channel *chan; |
| 2247 | |
| 2248 | /* Setup lttng message with no payload */ |
| 2249 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 2250 | if (ret < 0) { |
| 2251 | goto setup_error; |
| 2252 | } |
| 2253 | |
| 2254 | /* Kernel tracing */ |
| 2255 | if (cmd_ctx->session->kernel_session != NULL) { |
| 2256 | if (cmd_ctx->session->kernel_session->metadata == NULL) { |
| 2257 | DBG("Open kernel metadata"); |
| 2258 | ret = kernel_open_metadata(cmd_ctx->session->kernel_session, |
| 2259 | cmd_ctx->session->kernel_session->trace_path); |
| 2260 | if (ret < 0) { |
| 2261 | ret = LTTCOMM_KERN_META_FAIL; |
| 2262 | goto error; |
| 2263 | } |
| 2264 | } |
| 2265 | |
| 2266 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { |
| 2267 | DBG("Opening kernel metadata stream"); |
| 2268 | if (cmd_ctx->session->kernel_session->metadata_stream_fd == 0) { |
| 2269 | ret = kernel_open_metadata_stream(cmd_ctx->session->kernel_session); |
| 2270 | if (ret < 0) { |
| 2271 | ERR("Kernel create metadata stream failed"); |
| 2272 | ret = LTTCOMM_KERN_STREAM_FAIL; |
| 2273 | goto error; |
| 2274 | } |
| 2275 | } |
| 2276 | } |
| 2277 | |
| 2278 | /* For each channel */ |
| 2279 | cds_list_for_each_entry(chan, |
| 2280 | &cmd_ctx->session->kernel_session->channel_list.head, list) { |
| 2281 | if (chan->stream_count == 0) { |
| 2282 | ret = kernel_open_channel_stream(chan); |
| 2283 | if (ret < 0) { |
| 2284 | ERR("Kernel create channel stream failed"); |
| 2285 | ret = LTTCOMM_KERN_STREAM_FAIL; |
| 2286 | goto error; |
| 2287 | } |
| 2288 | /* Update the stream global counter */ |
| 2289 | cmd_ctx->session->kernel_session->stream_count_global += ret; |
| 2290 | } |
| 2291 | } |
| 2292 | |
| 2293 | ret = start_kernel_trace(cmd_ctx->session->kernel_session); |
| 2294 | if (ret < 0) { |
| 2295 | ret = LTTCOMM_KERN_START_FAIL; |
| 2296 | goto error; |
| 2297 | } |
| 2298 | |
| 2299 | DBG("Start kernel tracing"); |
| 2300 | ret = kernel_start_session(cmd_ctx->session->kernel_session); |
| 2301 | if (ret < 0) { |
| 2302 | ERR("Kernel start session failed"); |
| 2303 | ret = LTTCOMM_KERN_START_FAIL; |
| 2304 | goto error; |
| 2305 | } |
| 2306 | |
| 2307 | /* Quiescent wait after starting trace */ |
| 2308 | kernel_wait_quiescent(kernel_tracer_fd); |
| 2309 | } |
| 2310 | |
| 2311 | /* TODO: Start all UST traces */ |
| 2312 | |
| 2313 | ret = LTTCOMM_OK; |
| 2314 | break; |
| 2315 | } |
| 2316 | case LTTNG_STOP_TRACE: |
| 2317 | { |
| 2318 | struct ltt_kernel_channel *chan; |
| 2319 | /* Setup lttng message with no payload */ |
| 2320 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 2321 | if (ret < 0) { |
| 2322 | goto setup_error; |
| 2323 | } |
| 2324 | |
| 2325 | /* Kernel tracer */ |
| 2326 | if (cmd_ctx->session->kernel_session != NULL) { |
| 2327 | DBG("Stop kernel tracing"); |
| 2328 | |
| 2329 | ret = kernel_metadata_flush_buffer(cmd_ctx->session->kernel_session->metadata_stream_fd); |
| 2330 | if (ret < 0) { |
| 2331 | ERR("Kernel metadata flush failed"); |
| 2332 | } |
| 2333 | |
| 2334 | cds_list_for_each_entry(chan, &cmd_ctx->session->kernel_session->channel_list.head, list) { |
| 2335 | ret = kernel_flush_buffer(chan); |
| 2336 | if (ret < 0) { |
| 2337 | ERR("Kernel flush buffer error"); |
| 2338 | } |
| 2339 | } |
| 2340 | |
| 2341 | ret = kernel_stop_session(cmd_ctx->session->kernel_session); |
| 2342 | if (ret < 0) { |
| 2343 | ERR("Kernel stop session failed"); |
| 2344 | ret = LTTCOMM_KERN_STOP_FAIL; |
| 2345 | goto error; |
| 2346 | } |
| 2347 | |
| 2348 | /* Quiescent wait after stopping trace */ |
| 2349 | kernel_wait_quiescent(kernel_tracer_fd); |
| 2350 | } |
| 2351 | |
| 2352 | /* TODO : User-space tracer */ |
| 2353 | |
| 2354 | ret = LTTCOMM_OK; |
| 2355 | break; |
| 2356 | } |
| 2357 | case LTTNG_CREATE_SESSION: |
| 2358 | { |
| 2359 | /* Setup lttng message with no payload */ |
| 2360 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 2361 | if (ret < 0) { |
| 2362 | goto setup_error; |
| 2363 | } |
| 2364 | |
| 2365 | tracepoint(create_session_start); |
| 2366 | ret = create_session(cmd_ctx->lsm->session.name, cmd_ctx->lsm->session.path); |
| 2367 | tracepoint(create_session_end); |
| 2368 | if (ret < 0) { |
| 2369 | if (ret == -EEXIST) { |
| 2370 | ret = LTTCOMM_EXIST_SESS; |
| 2371 | } else { |
| 2372 | ret = LTTCOMM_FATAL; |
| 2373 | } |
| 2374 | goto error; |
| 2375 | } |
| 2376 | |
| 2377 | ret = LTTCOMM_OK; |
| 2378 | break; |
| 2379 | } |
| 2380 | case LTTNG_DESTROY_SESSION: |
| 2381 | { |
| 2382 | /* Setup lttng message with no payload */ |
| 2383 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 2384 | if (ret < 0) { |
| 2385 | goto setup_error; |
| 2386 | } |
| 2387 | |
| 2388 | /* Clean kernel session teardown */ |
| 2389 | teardown_kernel_session(cmd_ctx->session); |
| 2390 | |
| 2391 | tracepoint(destroy_session_start); |
| 2392 | ret = destroy_session(cmd_ctx->lsm->session.name); |
| 2393 | tracepoint(destroy_session_end); |
| 2394 | if (ret < 0) { |
| 2395 | ret = LTTCOMM_FATAL; |
| 2396 | goto error; |
| 2397 | } |
| 2398 | |
| 2399 | /* |
| 2400 | * Must notify the kernel thread here to update it's pollfd in order to |
| 2401 | * remove the channel(s)' fd just destroyed. |
| 2402 | */ |
| 2403 | ret = notify_kernel_pollfd(); |
| 2404 | if (ret < 0) { |
| 2405 | ret = LTTCOMM_FATAL; |
| 2406 | goto error; |
| 2407 | } |
| 2408 | |
| 2409 | ret = LTTCOMM_OK; |
| 2410 | break; |
| 2411 | } |
| 2412 | case LTTNG_LIST_DOMAINS: |
| 2413 | { |
| 2414 | size_t nb_dom = 0; |
| 2415 | |
| 2416 | if (cmd_ctx->session->kernel_session != NULL) { |
| 2417 | nb_dom++; |
| 2418 | } |
| 2419 | |
| 2420 | nb_dom += cmd_ctx->session->ust_session_list.count; |
| 2421 | |
| 2422 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_domain) * nb_dom); |
| 2423 | if (ret < 0) { |
| 2424 | goto setup_error; |
| 2425 | } |
| 2426 | |
| 2427 | ((struct lttng_domain *)(cmd_ctx->llm->payload))[0].type = |
| 2428 | LTTNG_DOMAIN_KERNEL; |
| 2429 | |
| 2430 | /* TODO: User-space tracer domain support */ |
| 2431 | ret = LTTCOMM_OK; |
| 2432 | break; |
| 2433 | } |
| 2434 | case LTTNG_LIST_CHANNELS: |
| 2435 | { |
| 2436 | /* |
| 2437 | * TODO: Only kernel channels are listed here. UST listing |
| 2438 | * is needed on lttng-ust 2.0 release. |
| 2439 | */ |
| 2440 | size_t nb_chan = 0; |
| 2441 | if (cmd_ctx->session->kernel_session != NULL) { |
| 2442 | nb_chan += cmd_ctx->session->kernel_session->channel_count; |
| 2443 | } |
| 2444 | |
| 2445 | ret = setup_lttng_msg(cmd_ctx, |
| 2446 | sizeof(struct lttng_channel) * nb_chan); |
| 2447 | if (ret < 0) { |
| 2448 | goto setup_error; |
| 2449 | } |
| 2450 | |
| 2451 | list_lttng_channels(cmd_ctx->session, |
| 2452 | (struct lttng_channel *)(cmd_ctx->llm->payload)); |
| 2453 | |
| 2454 | ret = LTTCOMM_OK; |
| 2455 | break; |
| 2456 | } |
| 2457 | case LTTNG_LIST_EVENTS: |
| 2458 | { |
| 2459 | /* |
| 2460 | * TODO: Only kernel events are listed here. UST listing |
| 2461 | * is needed on lttng-ust 2.0 release. |
| 2462 | */ |
| 2463 | size_t nb_event = 0; |
| 2464 | struct ltt_kernel_channel *kchan = NULL; |
| 2465 | |
| 2466 | if (cmd_ctx->session->kernel_session != NULL) { |
| 2467 | kchan = trace_kernel_get_channel_by_name(cmd_ctx->lsm->u.list.channel_name, |
| 2468 | cmd_ctx->session->kernel_session); |
| 2469 | if (kchan == NULL) { |
| 2470 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; |
| 2471 | goto error; |
| 2472 | } |
| 2473 | nb_event += kchan->event_count; |
| 2474 | } |
| 2475 | |
| 2476 | ret = setup_lttng_msg(cmd_ctx, |
| 2477 | sizeof(struct lttng_event) * nb_event); |
| 2478 | if (ret < 0) { |
| 2479 | goto setup_error; |
| 2480 | } |
| 2481 | |
| 2482 | DBG("Listing events (%zu events)", nb_event); |
| 2483 | |
| 2484 | list_lttng_events(kchan, |
| 2485 | (struct lttng_event *)(cmd_ctx->llm->payload)); |
| 2486 | |
| 2487 | ret = LTTCOMM_OK; |
| 2488 | break; |
| 2489 | } |
| 2490 | case LTTNG_LIST_SESSIONS: |
| 2491 | { |
| 2492 | lock_session_list(); |
| 2493 | |
| 2494 | if (session_list_ptr->count == 0) { |
| 2495 | ret = LTTCOMM_NO_SESSION; |
| 2496 | unlock_session_list(); |
| 2497 | goto error; |
| 2498 | } |
| 2499 | |
| 2500 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
| 2501 | session_list_ptr->count); |
| 2502 | if (ret < 0) { |
| 2503 | unlock_session_list(); |
| 2504 | goto setup_error; |
| 2505 | } |
| 2506 | |
| 2507 | /* Filled the session array */ |
| 2508 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); |
| 2509 | |
| 2510 | unlock_session_list(); |
| 2511 | |
| 2512 | ret = LTTCOMM_OK; |
| 2513 | break; |
| 2514 | } |
| 2515 | case LTTNG_CALIBRATE: |
| 2516 | { |
| 2517 | /* Setup lttng message with no payload */ |
| 2518 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 2519 | if (ret < 0) { |
| 2520 | goto setup_error; |
| 2521 | } |
| 2522 | |
| 2523 | switch (cmd_ctx->lsm->domain.type) { |
| 2524 | case LTTNG_DOMAIN_KERNEL: |
| 2525 | { |
| 2526 | struct lttng_kernel_calibrate kcalibrate; |
| 2527 | |
| 2528 | kcalibrate.type = cmd_ctx->lsm->u.calibrate.type; |
| 2529 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); |
| 2530 | if (ret < 0) { |
| 2531 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
| 2532 | goto error; |
| 2533 | } |
| 2534 | break; |
| 2535 | } |
| 2536 | default: |
| 2537 | /* TODO: Userspace tracing */ |
| 2538 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2539 | goto error; |
| 2540 | } |
| 2541 | ret = LTTCOMM_OK; |
| 2542 | break; |
| 2543 | } |
| 2544 | case LTTNG_REGISTER_CONSUMER: |
| 2545 | { |
| 2546 | int sock; |
| 2547 | |
| 2548 | /* Setup lttng message with no payload */ |
| 2549 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 2550 | if (ret < 0) { |
| 2551 | goto setup_error; |
| 2552 | } |
| 2553 | |
| 2554 | switch (cmd_ctx->lsm->domain.type) { |
| 2555 | case LTTNG_DOMAIN_KERNEL: |
| 2556 | { |
| 2557 | /* Can't register a consumer if there is already one */ |
| 2558 | if (cmd_ctx->session->kernel_session->consumer_fd != 0) { |
| 2559 | ret = LTTCOMM_CONNECT_FAIL; |
| 2560 | goto error; |
| 2561 | } |
| 2562 | |
| 2563 | sock = lttcomm_connect_unix_sock(cmd_ctx->lsm->u.reg.path); |
| 2564 | if (sock < 0) { |
| 2565 | ret = LTTCOMM_CONNECT_FAIL; |
| 2566 | goto error; |
| 2567 | } |
| 2568 | |
| 2569 | cmd_ctx->session->kernel_session->consumer_fd = sock; |
| 2570 | break; |
| 2571 | } |
| 2572 | default: |
| 2573 | /* TODO: Userspace tracing */ |
| 2574 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2575 | goto error; |
| 2576 | } |
| 2577 | |
| 2578 | ret = LTTCOMM_OK; |
| 2579 | break; |
| 2580 | } |
| 2581 | |
| 2582 | default: |
| 2583 | /* Undefined command */ |
| 2584 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 2585 | if (ret < 0) { |
| 2586 | goto setup_error; |
| 2587 | } |
| 2588 | |
| 2589 | ret = LTTCOMM_UND; |
| 2590 | break; |
| 2591 | } |
| 2592 | |
| 2593 | /* Set return code */ |
| 2594 | cmd_ctx->llm->ret_code = ret; |
| 2595 | |
| 2596 | if (cmd_ctx->session) { |
| 2597 | unlock_session(cmd_ctx->session); |
| 2598 | } |
| 2599 | |
| 2600 | return ret; |
| 2601 | |
| 2602 | error: |
| 2603 | if (cmd_ctx->llm == NULL) { |
| 2604 | DBG("Missing llm structure. Allocating one."); |
| 2605 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
| 2606 | goto setup_error; |
| 2607 | } |
| 2608 | } |
| 2609 | /* Notify client of error */ |
| 2610 | cmd_ctx->llm->ret_code = ret; |
| 2611 | |
| 2612 | setup_error: |
| 2613 | if (cmd_ctx->session) { |
| 2614 | unlock_session(cmd_ctx->session); |
| 2615 | } |
| 2616 | return ret; |
| 2617 | } |
| 2618 | |
| 2619 | /* |
| 2620 | * This thread manage all clients request using the unix client socket for |
| 2621 | * communication. |
| 2622 | */ |
| 2623 | static void *thread_manage_clients(void *data) |
| 2624 | { |
| 2625 | int sock = 0, ret; |
| 2626 | struct command_ctx *cmd_ctx = NULL; |
| 2627 | struct pollfd pollfd[2]; |
| 2628 | |
| 2629 | tracepoint(sessiond_th_cli_start); |
| 2630 | |
| 2631 | DBG("[thread] Manage client started"); |
| 2632 | |
| 2633 | ret = lttcomm_listen_unix_sock(client_sock); |
| 2634 | if (ret < 0) { |
| 2635 | goto error; |
| 2636 | } |
| 2637 | |
| 2638 | /* First fd is always the quit pipe */ |
| 2639 | pollfd[0].fd = thread_quit_pipe[0]; |
| 2640 | |
| 2641 | /* Apps socket */ |
| 2642 | pollfd[1].fd = client_sock; |
| 2643 | pollfd[1].events = POLLIN; |
| 2644 | |
| 2645 | /* Notify parent pid that we are ready |
| 2646 | * to accept command for client side. |
| 2647 | */ |
| 2648 | if (opt_sig_parent) { |
| 2649 | kill(ppid, SIGCHLD); |
| 2650 | } |
| 2651 | |
| 2652 | while (1) { |
| 2653 | DBG("Accepting client command ..."); |
| 2654 | |
| 2655 | tracepoint(sessiond_th_cli_poll); |
| 2656 | |
| 2657 | /* Inifinite blocking call, waiting for transmission */ |
| 2658 | ret = poll(pollfd, 2, -1); |
| 2659 | if (ret < 0) { |
| 2660 | perror("poll client thread"); |
| 2661 | goto error; |
| 2662 | } |
| 2663 | |
| 2664 | /* Thread quit pipe has been closed. Killing thread. */ |
| 2665 | if (pollfd[0].revents == POLLNVAL) { |
| 2666 | goto error; |
| 2667 | } else if (pollfd[1].revents == POLLERR) { |
| 2668 | ERR("Client socket poll error"); |
| 2669 | goto error; |
| 2670 | } |
| 2671 | |
| 2672 | sock = lttcomm_accept_unix_sock(client_sock); |
| 2673 | if (sock < 0) { |
| 2674 | goto error; |
| 2675 | } |
| 2676 | |
| 2677 | /* Allocate context command to process the client request */ |
| 2678 | cmd_ctx = malloc(sizeof(struct command_ctx)); |
| 2679 | |
| 2680 | /* Allocate data buffer for reception */ |
| 2681 | cmd_ctx->lsm = malloc(sizeof(struct lttcomm_session_msg)); |
| 2682 | cmd_ctx->llm = NULL; |
| 2683 | cmd_ctx->session = NULL; |
| 2684 | |
| 2685 | /* |
| 2686 | * Data is received from the lttng client. The struct |
| 2687 | * lttcomm_session_msg (lsm) contains the command and data request of |
| 2688 | * the client. |
| 2689 | */ |
| 2690 | DBG("Receiving data from client ..."); |
| 2691 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, sizeof(struct lttcomm_session_msg)); |
| 2692 | if (ret <= 0) { |
| 2693 | continue; |
| 2694 | } |
| 2695 | |
| 2696 | // TODO: Validate cmd_ctx including sanity check for security purpose. |
| 2697 | |
| 2698 | /* |
| 2699 | * This function dispatch the work to the kernel or userspace tracer |
| 2700 | * libs and fill the lttcomm_lttng_msg data structure of all the needed |
| 2701 | * informations for the client. The command context struct contains |
| 2702 | * everything this function may needs. |
| 2703 | */ |
| 2704 | ret = process_client_msg(cmd_ctx); |
| 2705 | if (ret < 0) { |
| 2706 | /* TODO: Inform client somehow of the fatal error. At this point, |
| 2707 | * ret < 0 means that a malloc failed (ENOMEM). */ |
| 2708 | /* Error detected but still accept command */ |
| 2709 | clean_command_ctx(&cmd_ctx); |
| 2710 | continue; |
| 2711 | } |
| 2712 | |
| 2713 | DBG("Sending response (size: %d, retcode: %d)", |
| 2714 | cmd_ctx->lttng_msg_size, cmd_ctx->llm->ret_code); |
| 2715 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
| 2716 | if (ret < 0) { |
| 2717 | ERR("Failed to send data back to client"); |
| 2718 | } |
| 2719 | |
| 2720 | clean_command_ctx(&cmd_ctx); |
| 2721 | |
| 2722 | /* End of transmission */ |
| 2723 | close(sock); |
| 2724 | } |
| 2725 | |
| 2726 | error: |
| 2727 | DBG("Client thread dying"); |
| 2728 | if (client_sock) { |
| 2729 | close(client_sock); |
| 2730 | } |
| 2731 | if (sock) { |
| 2732 | close(sock); |
| 2733 | } |
| 2734 | |
| 2735 | unlink(client_unix_sock_path); |
| 2736 | |
| 2737 | clean_command_ctx(&cmd_ctx); |
| 2738 | return NULL; |
| 2739 | } |
| 2740 | |
| 2741 | |
| 2742 | /* |
| 2743 | * usage function on stderr |
| 2744 | */ |
| 2745 | static void usage(void) |
| 2746 | { |
| 2747 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
| 2748 | fprintf(stderr, " -h, --help Display this usage.\n"); |
| 2749 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); |
| 2750 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); |
| 2751 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); |
| 2752 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); |
| 2753 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
| 2754 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); |
| 2755 | fprintf(stderr, " -V, --version Show version number.\n"); |
| 2756 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); |
| 2757 | fprintf(stderr, " -q, --quiet No output at all.\n"); |
| 2758 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); |
| 2759 | fprintf(stderr, " --verbose-kconsumerd Verbose mode for kconsumerd. Activate DBG() macro.\n"); |
| 2760 | } |
| 2761 | |
| 2762 | /* |
| 2763 | * daemon argument parsing |
| 2764 | */ |
| 2765 | static int parse_args(int argc, char **argv) |
| 2766 | { |
| 2767 | int c; |
| 2768 | |
| 2769 | static struct option long_options[] = { |
| 2770 | { "client-sock", 1, 0, 'c' }, |
| 2771 | { "apps-sock", 1, 0, 'a' }, |
| 2772 | { "kconsumerd-cmd-sock", 1, 0, 0 }, |
| 2773 | { "kconsumerd-err-sock", 1, 0, 0 }, |
| 2774 | { "daemonize", 0, 0, 'd' }, |
| 2775 | { "sig-parent", 0, 0, 'S' }, |
| 2776 | { "help", 0, 0, 'h' }, |
| 2777 | { "group", 1, 0, 'g' }, |
| 2778 | { "version", 0, 0, 'V' }, |
| 2779 | { "quiet", 0, 0, 'q' }, |
| 2780 | { "verbose", 0, 0, 'v' }, |
| 2781 | { "verbose-kconsumerd", 0, 0, 'Z' }, |
| 2782 | { NULL, 0, 0, 0 } |
| 2783 | }; |
| 2784 | |
| 2785 | while (1) { |
| 2786 | int option_index = 0; |
| 2787 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:E:C:Z", long_options, &option_index); |
| 2788 | if (c == -1) { |
| 2789 | break; |
| 2790 | } |
| 2791 | |
| 2792 | switch (c) { |
| 2793 | case 0: |
| 2794 | fprintf(stderr, "option %s", long_options[option_index].name); |
| 2795 | if (optarg) { |
| 2796 | fprintf(stderr, " with arg %s\n", optarg); |
| 2797 | } |
| 2798 | break; |
| 2799 | case 'c': |
| 2800 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
| 2801 | break; |
| 2802 | case 'a': |
| 2803 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); |
| 2804 | break; |
| 2805 | case 'd': |
| 2806 | opt_daemon = 1; |
| 2807 | break; |
| 2808 | case 'g': |
| 2809 | opt_tracing_group = strdup(optarg); |
| 2810 | break; |
| 2811 | case 'h': |
| 2812 | usage(); |
| 2813 | exit(EXIT_FAILURE); |
| 2814 | case 'V': |
| 2815 | fprintf(stdout, "%s\n", VERSION); |
| 2816 | exit(EXIT_SUCCESS); |
| 2817 | case 'S': |
| 2818 | opt_sig_parent = 1; |
| 2819 | break; |
| 2820 | case 'E': |
| 2821 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, "%s", optarg); |
| 2822 | break; |
| 2823 | case 'C': |
| 2824 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
| 2825 | break; |
| 2826 | case 'q': |
| 2827 | opt_quiet = 1; |
| 2828 | break; |
| 2829 | case 'v': |
| 2830 | /* Verbose level can increase using multiple -v */ |
| 2831 | opt_verbose += 1; |
| 2832 | break; |
| 2833 | case 'Z': |
| 2834 | opt_verbose_kconsumerd += 1; |
| 2835 | break; |
| 2836 | default: |
| 2837 | /* Unknown option or other error. |
| 2838 | * Error is printed by getopt, just return */ |
| 2839 | return -1; |
| 2840 | } |
| 2841 | } |
| 2842 | |
| 2843 | return 0; |
| 2844 | } |
| 2845 | |
| 2846 | /* |
| 2847 | * Creates the two needed socket by the daemon. |
| 2848 | * apps_sock - The communication socket for all UST apps. |
| 2849 | * client_sock - The communication of the cli tool (lttng). |
| 2850 | */ |
| 2851 | static int init_daemon_socket(void) |
| 2852 | { |
| 2853 | int ret = 0; |
| 2854 | mode_t old_umask; |
| 2855 | |
| 2856 | old_umask = umask(0); |
| 2857 | |
| 2858 | /* Create client tool unix socket */ |
| 2859 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
| 2860 | if (client_sock < 0) { |
| 2861 | ERR("Create unix sock failed: %s", client_unix_sock_path); |
| 2862 | ret = -1; |
| 2863 | goto end; |
| 2864 | } |
| 2865 | |
| 2866 | /* File permission MUST be 660 */ |
| 2867 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 2868 | if (ret < 0) { |
| 2869 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
| 2870 | perror("chmod"); |
| 2871 | goto end; |
| 2872 | } |
| 2873 | |
| 2874 | /* Create the application unix socket */ |
| 2875 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
| 2876 | if (apps_sock < 0) { |
| 2877 | ERR("Create unix sock failed: %s", apps_unix_sock_path); |
| 2878 | ret = -1; |
| 2879 | goto end; |
| 2880 | } |
| 2881 | |
| 2882 | /* File permission MUST be 666 */ |
| 2883 | ret = chmod(apps_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
| 2884 | if (ret < 0) { |
| 2885 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
| 2886 | perror("chmod"); |
| 2887 | goto end; |
| 2888 | } |
| 2889 | |
| 2890 | end: |
| 2891 | umask(old_umask); |
| 2892 | return ret; |
| 2893 | } |
| 2894 | |
| 2895 | /* |
| 2896 | * Check if the global socket is available, and if a daemon is answering |
| 2897 | * at the other side. If yes, error is returned. |
| 2898 | */ |
| 2899 | static int check_existing_daemon(void) |
| 2900 | { |
| 2901 | if (access(client_unix_sock_path, F_OK) < 0 && |
| 2902 | access(apps_unix_sock_path, F_OK) < 0) { |
| 2903 | return 0; |
| 2904 | } |
| 2905 | /* Is there anybody out there ? */ |
| 2906 | if (lttng_session_daemon_alive()) { |
| 2907 | return -EEXIST; |
| 2908 | } else { |
| 2909 | return 0; |
| 2910 | } |
| 2911 | } |
| 2912 | |
| 2913 | /* |
| 2914 | * Set the tracing group gid onto the client socket. |
| 2915 | * |
| 2916 | * Race window between mkdir and chown is OK because we are going from more |
| 2917 | * permissive (root.root) to les permissive (root.tracing). |
| 2918 | */ |
| 2919 | static int set_permissions(void) |
| 2920 | { |
| 2921 | int ret; |
| 2922 | gid_t gid; |
| 2923 | |
| 2924 | gid = allowed_group(); |
| 2925 | if (gid < 0) { |
| 2926 | if (is_root) { |
| 2927 | WARN("No tracing group detected"); |
| 2928 | ret = 0; |
| 2929 | } else { |
| 2930 | ERR("Missing tracing group. Aborting execution."); |
| 2931 | ret = -1; |
| 2932 | } |
| 2933 | goto end; |
| 2934 | } |
| 2935 | |
| 2936 | /* Set lttng run dir */ |
| 2937 | ret = chown(LTTNG_RUNDIR, 0, gid); |
| 2938 | if (ret < 0) { |
| 2939 | ERR("Unable to set group on " LTTNG_RUNDIR); |
| 2940 | perror("chown"); |
| 2941 | } |
| 2942 | |
| 2943 | /* lttng client socket path */ |
| 2944 | ret = chown(client_unix_sock_path, 0, gid); |
| 2945 | if (ret < 0) { |
| 2946 | ERR("Unable to set group on %s", client_unix_sock_path); |
| 2947 | perror("chown"); |
| 2948 | } |
| 2949 | |
| 2950 | /* kconsumerd error socket path */ |
| 2951 | ret = chown(kconsumerd_err_unix_sock_path, 0, gid); |
| 2952 | if (ret < 0) { |
| 2953 | ERR("Unable to set group on %s", kconsumerd_err_unix_sock_path); |
| 2954 | perror("chown"); |
| 2955 | } |
| 2956 | |
| 2957 | DBG("All permissions are set"); |
| 2958 | |
| 2959 | end: |
| 2960 | return ret; |
| 2961 | } |
| 2962 | |
| 2963 | /* |
| 2964 | * Create the pipe used to wake up the kernel thread. |
| 2965 | */ |
| 2966 | static int create_kernel_poll_pipe(void) |
| 2967 | { |
| 2968 | return pipe2(kernel_poll_pipe, O_CLOEXEC); |
| 2969 | } |
| 2970 | |
| 2971 | /* |
| 2972 | * Create the application command pipe to wake thread_manage_apps. |
| 2973 | */ |
| 2974 | static int create_apps_cmd_pipe(void) |
| 2975 | { |
| 2976 | return pipe2(apps_cmd_pipe, O_CLOEXEC); |
| 2977 | } |
| 2978 | |
| 2979 | /* |
| 2980 | * Create the lttng run directory needed for all global sockets and pipe. |
| 2981 | */ |
| 2982 | static int create_lttng_rundir(void) |
| 2983 | { |
| 2984 | int ret; |
| 2985 | |
| 2986 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); |
| 2987 | if (ret < 0) { |
| 2988 | if (errno != EEXIST) { |
| 2989 | ERR("Unable to create " LTTNG_RUNDIR); |
| 2990 | goto error; |
| 2991 | } else { |
| 2992 | ret = 0; |
| 2993 | } |
| 2994 | } |
| 2995 | |
| 2996 | error: |
| 2997 | return ret; |
| 2998 | } |
| 2999 | |
| 3000 | /* |
| 3001 | * Setup sockets and directory needed by the kconsumerd communication with the |
| 3002 | * session daemon. |
| 3003 | */ |
| 3004 | static int set_kconsumerd_sockets(void) |
| 3005 | { |
| 3006 | int ret; |
| 3007 | |
| 3008 | if (strlen(kconsumerd_err_unix_sock_path) == 0) { |
| 3009 | snprintf(kconsumerd_err_unix_sock_path, PATH_MAX, KCONSUMERD_ERR_SOCK_PATH); |
| 3010 | } |
| 3011 | |
| 3012 | if (strlen(kconsumerd_cmd_unix_sock_path) == 0) { |
| 3013 | snprintf(kconsumerd_cmd_unix_sock_path, PATH_MAX, KCONSUMERD_CMD_SOCK_PATH); |
| 3014 | } |
| 3015 | |
| 3016 | ret = mkdir(KCONSUMERD_PATH, S_IRWXU | S_IRWXG); |
| 3017 | if (ret < 0) { |
| 3018 | if (errno != EEXIST) { |
| 3019 | ERR("Failed to create " KCONSUMERD_PATH); |
| 3020 | goto error; |
| 3021 | } |
| 3022 | ret = 0; |
| 3023 | } |
| 3024 | |
| 3025 | /* Create the kconsumerd error unix socket */ |
| 3026 | kconsumerd_err_sock = lttcomm_create_unix_sock(kconsumerd_err_unix_sock_path); |
| 3027 | if (kconsumerd_err_sock < 0) { |
| 3028 | ERR("Create unix sock failed: %s", kconsumerd_err_unix_sock_path); |
| 3029 | ret = -1; |
| 3030 | goto error; |
| 3031 | } |
| 3032 | |
| 3033 | /* File permission MUST be 660 */ |
| 3034 | ret = chmod(kconsumerd_err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 3035 | if (ret < 0) { |
| 3036 | ERR("Set file permissions failed: %s", kconsumerd_err_unix_sock_path); |
| 3037 | perror("chmod"); |
| 3038 | goto error; |
| 3039 | } |
| 3040 | |
| 3041 | error: |
| 3042 | return ret; |
| 3043 | } |
| 3044 | |
| 3045 | /* |
| 3046 | * Signal handler for the daemon |
| 3047 | * |
| 3048 | * Simply stop all worker threads, leaving main() return gracefully |
| 3049 | * after joining all threads and calling cleanup(). |
| 3050 | */ |
| 3051 | static void sighandler(int sig) |
| 3052 | { |
| 3053 | switch (sig) { |
| 3054 | case SIGPIPE: |
| 3055 | DBG("SIGPIPE catched"); |
| 3056 | return; |
| 3057 | case SIGINT: |
| 3058 | DBG("SIGINT catched"); |
| 3059 | stop_threads(); |
| 3060 | break; |
| 3061 | case SIGTERM: |
| 3062 | DBG("SIGTERM catched"); |
| 3063 | stop_threads(); |
| 3064 | break; |
| 3065 | default: |
| 3066 | break; |
| 3067 | } |
| 3068 | } |
| 3069 | |
| 3070 | /* |
| 3071 | * Setup signal handler for : |
| 3072 | * SIGINT, SIGTERM, SIGPIPE |
| 3073 | */ |
| 3074 | static int set_signal_handler(void) |
| 3075 | { |
| 3076 | int ret = 0; |
| 3077 | struct sigaction sa; |
| 3078 | sigset_t sigset; |
| 3079 | |
| 3080 | if ((ret = sigemptyset(&sigset)) < 0) { |
| 3081 | perror("sigemptyset"); |
| 3082 | return ret; |
| 3083 | } |
| 3084 | |
| 3085 | sa.sa_handler = sighandler; |
| 3086 | sa.sa_mask = sigset; |
| 3087 | sa.sa_flags = 0; |
| 3088 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
| 3089 | perror("sigaction"); |
| 3090 | return ret; |
| 3091 | } |
| 3092 | |
| 3093 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
| 3094 | perror("sigaction"); |
| 3095 | return ret; |
| 3096 | } |
| 3097 | |
| 3098 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
| 3099 | perror("sigaction"); |
| 3100 | return ret; |
| 3101 | } |
| 3102 | |
| 3103 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
| 3104 | |
| 3105 | return ret; |
| 3106 | } |
| 3107 | |
| 3108 | /* |
| 3109 | * Set open files limit to unlimited. This daemon can open a large number of |
| 3110 | * file descriptors in order to consumer multiple kernel traces. |
| 3111 | */ |
| 3112 | static void set_ulimit(void) |
| 3113 | { |
| 3114 | int ret; |
| 3115 | struct rlimit lim; |
| 3116 | |
| 3117 | /* The kernel does not allowed an infinite limit for open files */ |
| 3118 | lim.rlim_cur = 65535; |
| 3119 | lim.rlim_max = 65535; |
| 3120 | |
| 3121 | ret = setrlimit(RLIMIT_NOFILE, &lim); |
| 3122 | if (ret < 0) { |
| 3123 | perror("failed to set open files limit"); |
| 3124 | } |
| 3125 | } |
| 3126 | |
| 3127 | /* |
| 3128 | * main |
| 3129 | */ |
| 3130 | int main(int argc, char **argv) |
| 3131 | { |
| 3132 | int ret = 0; |
| 3133 | void *status; |
| 3134 | const char *home_path; |
| 3135 | |
| 3136 | tracepoint(sessiond_boot_start); |
| 3137 | |
| 3138 | /* Create thread quit pipe */ |
| 3139 | if ((ret = init_thread_quit_pipe()) < 0) { |
| 3140 | goto error; |
| 3141 | } |
| 3142 | |
| 3143 | /* Parse arguments */ |
| 3144 | progname = argv[0]; |
| 3145 | if ((ret = parse_args(argc, argv) < 0)) { |
| 3146 | goto error; |
| 3147 | } |
| 3148 | |
| 3149 | /* Daemonize */ |
| 3150 | if (opt_daemon) { |
| 3151 | ret = daemon(0, 0); |
| 3152 | if (ret < 0) { |
| 3153 | perror("daemon"); |
| 3154 | goto error; |
| 3155 | } |
| 3156 | } |
| 3157 | |
| 3158 | /* Check if daemon is UID = 0 */ |
| 3159 | is_root = !getuid(); |
| 3160 | |
| 3161 | if (is_root) { |
| 3162 | ret = create_lttng_rundir(); |
| 3163 | if (ret < 0) { |
| 3164 | goto error; |
| 3165 | } |
| 3166 | |
| 3167 | if (strlen(apps_unix_sock_path) == 0) { |
| 3168 | snprintf(apps_unix_sock_path, PATH_MAX, |
| 3169 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); |
| 3170 | } |
| 3171 | |
| 3172 | if (strlen(client_unix_sock_path) == 0) { |
| 3173 | snprintf(client_unix_sock_path, PATH_MAX, |
| 3174 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); |
| 3175 | } |
| 3176 | |
| 3177 | /* Set global SHM for ust */ |
| 3178 | if (strlen(wait_shm_path) == 0) { |
| 3179 | snprintf(wait_shm_path, PATH_MAX, |
| 3180 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); |
| 3181 | } |
| 3182 | } else { |
| 3183 | home_path = get_home_dir(); |
| 3184 | if (home_path == NULL) { |
| 3185 | /* TODO: Add --socket PATH option */ |
| 3186 | ERR("Can't get HOME directory for sockets creation."); |
| 3187 | ret = -EPERM; |
| 3188 | goto error; |
| 3189 | } |
| 3190 | |
| 3191 | if (strlen(apps_unix_sock_path) == 0) { |
| 3192 | snprintf(apps_unix_sock_path, PATH_MAX, |
| 3193 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
| 3194 | } |
| 3195 | |
| 3196 | /* Set the cli tool unix socket path */ |
| 3197 | if (strlen(client_unix_sock_path) == 0) { |
| 3198 | snprintf(client_unix_sock_path, PATH_MAX, |
| 3199 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
| 3200 | } |
| 3201 | |
| 3202 | /* Set global SHM for ust */ |
| 3203 | if (strlen(wait_shm_path) == 0) { |
| 3204 | snprintf(wait_shm_path, PATH_MAX, |
| 3205 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); |
| 3206 | } |
| 3207 | } |
| 3208 | |
| 3209 | DBG("Client socket path %s", client_unix_sock_path); |
| 3210 | DBG("Application socket path %s", apps_unix_sock_path); |
| 3211 | |
| 3212 | /* |
| 3213 | * See if daemon already exist. |
| 3214 | */ |
| 3215 | if ((ret = check_existing_daemon()) < 0) { |
| 3216 | ERR("Already running daemon.\n"); |
| 3217 | /* |
| 3218 | * We do not goto exit because we must not cleanup() |
| 3219 | * because a daemon is already running. |
| 3220 | */ |
| 3221 | goto error; |
| 3222 | } |
| 3223 | |
| 3224 | /* After this point, we can safely call cleanup() so goto error is used */ |
| 3225 | |
| 3226 | /* |
| 3227 | * These actions must be executed as root. We do that *after* setting up |
| 3228 | * the sockets path because we MUST make the check for another daemon using |
| 3229 | * those paths *before* trying to set the kernel consumer sockets and init |
| 3230 | * kernel tracer. |
| 3231 | */ |
| 3232 | if (is_root) { |
| 3233 | ret = set_kconsumerd_sockets(); |
| 3234 | if (ret < 0) { |
| 3235 | goto exit; |
| 3236 | } |
| 3237 | |
| 3238 | /* Setup kernel tracer */ |
| 3239 | init_kernel_tracer(); |
| 3240 | |
| 3241 | /* Set ulimit for open files */ |
| 3242 | set_ulimit(); |
| 3243 | } |
| 3244 | |
| 3245 | if ((ret = set_signal_handler()) < 0) { |
| 3246 | goto exit; |
| 3247 | } |
| 3248 | |
| 3249 | /* Setup the needed unix socket */ |
| 3250 | if ((ret = init_daemon_socket()) < 0) { |
| 3251 | goto exit; |
| 3252 | } |
| 3253 | |
| 3254 | /* Set credentials to socket */ |
| 3255 | if (is_root && ((ret = set_permissions()) < 0)) { |
| 3256 | goto exit; |
| 3257 | } |
| 3258 | |
| 3259 | /* Get parent pid if -S, --sig-parent is specified. */ |
| 3260 | if (opt_sig_parent) { |
| 3261 | ppid = getppid(); |
| 3262 | } |
| 3263 | |
| 3264 | /* Setup the kernel pipe for waking up the kernel thread */ |
| 3265 | if ((ret = create_kernel_poll_pipe()) < 0) { |
| 3266 | goto exit; |
| 3267 | } |
| 3268 | |
| 3269 | /* Setup the thread apps communication pipe. */ |
| 3270 | if ((ret = create_apps_cmd_pipe()) < 0) { |
| 3271 | goto exit; |
| 3272 | } |
| 3273 | |
| 3274 | /* Init UST command queue. */ |
| 3275 | cds_wfq_init(&ust_cmd_queue.queue); |
| 3276 | |
| 3277 | /* |
| 3278 | * Get session list pointer. This pointer MUST NOT be free(). |
| 3279 | * This list is statically declared in session.c |
| 3280 | */ |
| 3281 | session_list_ptr = get_session_list(); |
| 3282 | |
| 3283 | /* Create thread to manage the client socket */ |
| 3284 | ret = pthread_create(&client_thread, NULL, |
| 3285 | thread_manage_clients, (void *) NULL); |
| 3286 | if (ret != 0) { |
| 3287 | perror("pthread_create clients"); |
| 3288 | goto exit_client; |
| 3289 | } |
| 3290 | |
| 3291 | /* Create thread to dispatch registration */ |
| 3292 | ret = pthread_create(&dispatch_thread, NULL, |
| 3293 | thread_dispatch_ust_registration, (void *) NULL); |
| 3294 | if (ret != 0) { |
| 3295 | perror("pthread_create dispatch"); |
| 3296 | goto exit_dispatch; |
| 3297 | } |
| 3298 | |
| 3299 | /* Create thread to manage application registration. */ |
| 3300 | ret = pthread_create(®_apps_thread, NULL, |
| 3301 | thread_registration_apps, (void *) NULL); |
| 3302 | if (ret != 0) { |
| 3303 | perror("pthread_create registration"); |
| 3304 | goto exit_reg_apps; |
| 3305 | } |
| 3306 | |
| 3307 | /* Create thread to manage application socket */ |
| 3308 | ret = pthread_create(&apps_thread, NULL, thread_manage_apps, (void *) NULL); |
| 3309 | if (ret != 0) { |
| 3310 | perror("pthread_create apps"); |
| 3311 | goto exit_apps; |
| 3312 | } |
| 3313 | |
| 3314 | /* Create kernel thread to manage kernel event */ |
| 3315 | ret = pthread_create(&kernel_thread, NULL, thread_manage_kernel, (void *) NULL); |
| 3316 | if (ret != 0) { |
| 3317 | perror("pthread_create kernel"); |
| 3318 | goto exit_kernel; |
| 3319 | } |
| 3320 | |
| 3321 | tracepoint(sessiond_boot_end); |
| 3322 | |
| 3323 | ret = pthread_join(kernel_thread, &status); |
| 3324 | if (ret != 0) { |
| 3325 | perror("pthread_join"); |
| 3326 | goto error; /* join error, exit without cleanup */ |
| 3327 | } |
| 3328 | |
| 3329 | exit_kernel: |
| 3330 | ret = pthread_join(apps_thread, &status); |
| 3331 | if (ret != 0) { |
| 3332 | perror("pthread_join"); |
| 3333 | goto error; /* join error, exit without cleanup */ |
| 3334 | } |
| 3335 | |
| 3336 | exit_apps: |
| 3337 | ret = pthread_join(reg_apps_thread, &status); |
| 3338 | if (ret != 0) { |
| 3339 | perror("pthread_join"); |
| 3340 | goto error; /* join error, exit without cleanup */ |
| 3341 | } |
| 3342 | |
| 3343 | exit_reg_apps: |
| 3344 | ret = pthread_join(dispatch_thread, &status); |
| 3345 | if (ret != 0) { |
| 3346 | perror("pthread_join"); |
| 3347 | goto error; /* join error, exit without cleanup */ |
| 3348 | } |
| 3349 | |
| 3350 | exit_dispatch: |
| 3351 | ret = pthread_join(client_thread, &status); |
| 3352 | if (ret != 0) { |
| 3353 | perror("pthread_join"); |
| 3354 | goto error; /* join error, exit without cleanup */ |
| 3355 | } |
| 3356 | |
| 3357 | ret = join_kconsumerd_thread(); |
| 3358 | if (ret != 0) { |
| 3359 | perror("join_kconsumerd"); |
| 3360 | goto error; /* join error, exit without cleanup */ |
| 3361 | } |
| 3362 | |
| 3363 | exit_client: |
| 3364 | exit: |
| 3365 | /* |
| 3366 | * cleanup() is called when no other thread is running. |
| 3367 | */ |
| 3368 | cleanup(); |
| 3369 | if (!ret) |
| 3370 | exit(EXIT_SUCCESS); |
| 3371 | error: |
| 3372 | exit(EXIT_FAILURE); |
| 3373 | } |