| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License as published by the Free |
| 7 | * Software Foundation; only version 2 of the License. |
| 8 | * |
| 9 | * This program is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| 12 | * more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU General Public License along with |
| 15 | * this program; if not, write to the Free Software Foundation, Inc., 59 Temple |
| 16 | * Place - Suite 330, Boston, MA 02111-1307, USA. |
| 17 | */ |
| 18 | |
| 19 | #define _GNU_SOURCE |
| 20 | #include <fcntl.h> |
| 21 | #include <getopt.h> |
| 22 | #include <grp.h> |
| 23 | #include <limits.h> |
| 24 | #include <pthread.h> |
| 25 | #include <semaphore.h> |
| 26 | #include <signal.h> |
| 27 | #include <stdio.h> |
| 28 | #include <stdlib.h> |
| 29 | #include <string.h> |
| 30 | #include <sys/mman.h> |
| 31 | #include <sys/mount.h> |
| 32 | #include <sys/resource.h> |
| 33 | #include <sys/socket.h> |
| 34 | #include <sys/stat.h> |
| 35 | #include <sys/types.h> |
| 36 | #include <sys/wait.h> |
| 37 | #include <urcu/futex.h> |
| 38 | #include <unistd.h> |
| 39 | #include <config.h> |
| 40 | |
| 41 | #include <lttng-consumerd.h> |
| 42 | #include <lttng-sessiond-comm.h> |
| 43 | #include <lttng/lttng-consumer.h> |
| 44 | |
| 45 | #include <lttngerr.h> |
| 46 | |
| 47 | #include "channel.h" |
| 48 | #include "compat/poll.h" |
| 49 | #include "context.h" |
| 50 | #include "event.h" |
| 51 | #include "futex.h" |
| 52 | #include "hashtable.h" |
| 53 | #include "kernel.h" |
| 54 | #include "lttng-sessiond.h" |
| 55 | #include "shm.h" |
| 56 | #include "ust-app.h" |
| 57 | #include "ust-ctl.h" |
| 58 | #include "utils.h" |
| 59 | |
| 60 | #define CONSUMERD_FILE "lttng-consumerd" |
| 61 | |
| 62 | struct consumer_data { |
| 63 | enum lttng_consumer_type type; |
| 64 | |
| 65 | pthread_t thread; /* Worker thread interacting with the consumer */ |
| 66 | sem_t sem; |
| 67 | |
| 68 | /* Mutex to control consumerd pid assignation */ |
| 69 | pthread_mutex_t pid_mutex; |
| 70 | pid_t pid; |
| 71 | |
| 72 | int err_sock; |
| 73 | int cmd_sock; |
| 74 | |
| 75 | /* consumer error and command Unix socket path */ |
| 76 | char err_unix_sock_path[PATH_MAX]; |
| 77 | char cmd_unix_sock_path[PATH_MAX]; |
| 78 | }; |
| 79 | |
| 80 | /* Const values */ |
| 81 | const char default_home_dir[] = DEFAULT_HOME_DIR; |
| 82 | const char default_tracing_group[] = LTTNG_DEFAULT_TRACING_GROUP; |
| 83 | const char default_ust_sock_dir[] = DEFAULT_UST_SOCK_DIR; |
| 84 | const char default_global_apps_pipe[] = DEFAULT_GLOBAL_APPS_PIPE; |
| 85 | |
| 86 | /* Variables */ |
| 87 | int opt_verbose; /* Not static for lttngerr.h */ |
| 88 | int opt_verbose_consumer; /* Not static for lttngerr.h */ |
| 89 | int opt_quiet; /* Not static for lttngerr.h */ |
| 90 | |
| 91 | const char *progname; |
| 92 | const char *opt_tracing_group; |
| 93 | static int opt_sig_parent; |
| 94 | static int opt_daemon; |
| 95 | static int is_root; /* Set to 1 if the daemon is running as root */ |
| 96 | static pid_t ppid; /* Parent PID for --sig-parent option */ |
| 97 | |
| 98 | /* Consumer daemon specific control data */ |
| 99 | static struct consumer_data kconsumer_data = { |
| 100 | .type = LTTNG_CONSUMER_KERNEL, |
| 101 | .err_unix_sock_path = KCONSUMERD_ERR_SOCK_PATH, |
| 102 | .cmd_unix_sock_path = KCONSUMERD_CMD_SOCK_PATH, |
| 103 | }; |
| 104 | static struct consumer_data ustconsumer64_data = { |
| 105 | .type = LTTNG_CONSUMER64_UST, |
| 106 | .err_unix_sock_path = USTCONSUMERD64_ERR_SOCK_PATH, |
| 107 | .cmd_unix_sock_path = USTCONSUMERD64_CMD_SOCK_PATH, |
| 108 | }; |
| 109 | static struct consumer_data ustconsumer32_data = { |
| 110 | .type = LTTNG_CONSUMER32_UST, |
| 111 | .err_unix_sock_path = USTCONSUMERD32_ERR_SOCK_PATH, |
| 112 | .cmd_unix_sock_path = USTCONSUMERD32_CMD_SOCK_PATH, |
| 113 | }; |
| 114 | |
| 115 | static int dispatch_thread_exit; |
| 116 | |
| 117 | /* Global application Unix socket path */ |
| 118 | static char apps_unix_sock_path[PATH_MAX]; |
| 119 | /* Global client Unix socket path */ |
| 120 | static char client_unix_sock_path[PATH_MAX]; |
| 121 | /* global wait shm path for UST */ |
| 122 | static char wait_shm_path[PATH_MAX]; |
| 123 | |
| 124 | /* Sockets and FDs */ |
| 125 | static int client_sock; |
| 126 | static int apps_sock; |
| 127 | static int kernel_tracer_fd; |
| 128 | static int kernel_poll_pipe[2]; |
| 129 | |
| 130 | /* |
| 131 | * Quit pipe for all threads. This permits a single cancellation point |
| 132 | * for all threads when receiving an event on the pipe. |
| 133 | */ |
| 134 | static int thread_quit_pipe[2]; |
| 135 | |
| 136 | /* |
| 137 | * This pipe is used to inform the thread managing application communication |
| 138 | * that a command is queued and ready to be processed. |
| 139 | */ |
| 140 | static int apps_cmd_pipe[2]; |
| 141 | |
| 142 | /* Pthread, Mutexes and Semaphores */ |
| 143 | static pthread_t apps_thread; |
| 144 | static pthread_t reg_apps_thread; |
| 145 | static pthread_t client_thread; |
| 146 | static pthread_t kernel_thread; |
| 147 | static pthread_t dispatch_thread; |
| 148 | |
| 149 | |
| 150 | /* |
| 151 | * UST registration command queue. This queue is tied with a futex and uses a N |
| 152 | * wakers / 1 waiter implemented and detailed in futex.c/.h |
| 153 | * |
| 154 | * The thread_manage_apps and thread_dispatch_ust_registration interact with |
| 155 | * this queue and the wait/wake scheme. |
| 156 | */ |
| 157 | static struct ust_cmd_queue ust_cmd_queue; |
| 158 | |
| 159 | /* |
| 160 | * Pointer initialized before thread creation. |
| 161 | * |
| 162 | * This points to the tracing session list containing the session count and a |
| 163 | * mutex lock. The lock MUST be taken if you iterate over the list. The lock |
| 164 | * MUST NOT be taken if you call a public function in session.c. |
| 165 | * |
| 166 | * The lock is nested inside the structure: session_list_ptr->lock. Please use |
| 167 | * session_lock_list and session_unlock_list for lock acquisition. |
| 168 | */ |
| 169 | static struct ltt_session_list *session_list_ptr; |
| 170 | |
| 171 | int ust_consumerd64_fd = -1; |
| 172 | int ust_consumerd32_fd = -1; |
| 173 | |
| 174 | static const char *consumerd32_bin = |
| 175 | __stringify(CONFIG_CONSUMERD32_BIN); |
| 176 | static const char *consumerd64_bin = |
| 177 | __stringify(CONFIG_CONSUMERD64_BIN); |
| 178 | static const char *consumerd32_libdir = |
| 179 | __stringify(CONFIG_CONSUMERD32_LIBDIR); |
| 180 | static const char *consumerd64_libdir = |
| 181 | __stringify(CONFIG_CONSUMERD64_LIBDIR); |
| 182 | |
| 183 | static |
| 184 | void setup_consumerd_path(void) |
| 185 | { |
| 186 | const char *bin, *libdir; |
| 187 | |
| 188 | /* |
| 189 | * Allow INSTALL_BIN_PATH to be used as a target path for the |
| 190 | * native architecture size consumer if CONFIG_CONSUMER*_PATH |
| 191 | * has not been defined. |
| 192 | */ |
| 193 | #if (CAA_BITS_PER_LONG == 32) |
| 194 | if (!consumerd32_bin[0]) { |
| 195 | consumerd32_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
| 196 | } |
| 197 | if (!consumerd32_libdir[0]) { |
| 198 | consumerd32_libdir = INSTALL_LIB_PATH; |
| 199 | } |
| 200 | #elif (CAA_BITS_PER_LONG == 64) |
| 201 | if (!consumerd64_bin[0]) { |
| 202 | consumerd64_bin = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
| 203 | } |
| 204 | if (!consumerd64_libdir[0]) { |
| 205 | consumerd64_libdir = INSTALL_LIB_PATH; |
| 206 | } |
| 207 | #else |
| 208 | #error "Unknown bitness" |
| 209 | #endif |
| 210 | |
| 211 | /* |
| 212 | * runtime env. var. overrides the build default. |
| 213 | */ |
| 214 | bin = getenv("LTTNG_CONSUMERD32_BIN"); |
| 215 | if (bin) { |
| 216 | consumerd32_bin = bin; |
| 217 | } |
| 218 | bin = getenv("LTTNG_CONSUMERD64_BIN"); |
| 219 | if (bin) { |
| 220 | consumerd64_bin = bin; |
| 221 | } |
| 222 | libdir = getenv("LTTNG_TOOLS_CONSUMERD32_LIBDIR"); |
| 223 | if (libdir) { |
| 224 | consumerd32_libdir = libdir; |
| 225 | } |
| 226 | libdir = getenv("LTTNG_TOOLS_CONSUMERD64_LIBDIR"); |
| 227 | if (libdir) { |
| 228 | consumerd64_libdir = libdir; |
| 229 | } |
| 230 | } |
| 231 | |
| 232 | /* |
| 233 | * Create a poll set with O_CLOEXEC and add the thread quit pipe to the set. |
| 234 | */ |
| 235 | static int create_thread_poll_set(struct lttng_poll_event *events, |
| 236 | unsigned int size) |
| 237 | { |
| 238 | int ret; |
| 239 | |
| 240 | if (events == NULL || size == 0) { |
| 241 | ret = -1; |
| 242 | goto error; |
| 243 | } |
| 244 | |
| 245 | ret = lttng_poll_create(events, size, LTTNG_CLOEXEC); |
| 246 | if (ret < 0) { |
| 247 | goto error; |
| 248 | } |
| 249 | |
| 250 | /* Add quit pipe */ |
| 251 | ret = lttng_poll_add(events, thread_quit_pipe[0], LPOLLIN); |
| 252 | if (ret < 0) { |
| 253 | goto error; |
| 254 | } |
| 255 | |
| 256 | return 0; |
| 257 | |
| 258 | error: |
| 259 | return ret; |
| 260 | } |
| 261 | |
| 262 | /* |
| 263 | * Check if the thread quit pipe was triggered. |
| 264 | * |
| 265 | * Return 1 if it was triggered else 0; |
| 266 | */ |
| 267 | static int check_thread_quit_pipe(int fd, uint32_t events) |
| 268 | { |
| 269 | if (fd == thread_quit_pipe[0] && (events & LPOLLIN)) { |
| 270 | return 1; |
| 271 | } |
| 272 | |
| 273 | return 0; |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * Remove modules in reverse load order. |
| 278 | */ |
| 279 | static int modprobe_remove_kernel_modules(void) |
| 280 | { |
| 281 | int ret = 0, i; |
| 282 | char modprobe[256]; |
| 283 | |
| 284 | for (i = ARRAY_SIZE(kernel_modules_list) - 1; i >= 0; i--) { |
| 285 | ret = snprintf(modprobe, sizeof(modprobe), |
| 286 | "/sbin/modprobe -r -q %s", |
| 287 | kernel_modules_list[i].name); |
| 288 | if (ret < 0) { |
| 289 | perror("snprintf modprobe -r"); |
| 290 | goto error; |
| 291 | } |
| 292 | modprobe[sizeof(modprobe) - 1] = '\0'; |
| 293 | ret = system(modprobe); |
| 294 | if (ret == -1) { |
| 295 | ERR("Unable to launch modprobe -r for module %s", |
| 296 | kernel_modules_list[i].name); |
| 297 | } else if (kernel_modules_list[i].required |
| 298 | && WEXITSTATUS(ret) != 0) { |
| 299 | ERR("Unable to remove module %s", |
| 300 | kernel_modules_list[i].name); |
| 301 | } else { |
| 302 | DBG("Modprobe removal successful %s", |
| 303 | kernel_modules_list[i].name); |
| 304 | } |
| 305 | } |
| 306 | |
| 307 | error: |
| 308 | return ret; |
| 309 | } |
| 310 | |
| 311 | /* |
| 312 | * Return group ID of the tracing group or -1 if not found. |
| 313 | */ |
| 314 | static gid_t allowed_group(void) |
| 315 | { |
| 316 | struct group *grp; |
| 317 | |
| 318 | if (opt_tracing_group) { |
| 319 | grp = getgrnam(opt_tracing_group); |
| 320 | } else { |
| 321 | grp = getgrnam(default_tracing_group); |
| 322 | } |
| 323 | if (!grp) { |
| 324 | return -1; |
| 325 | } else { |
| 326 | return grp->gr_gid; |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | /* |
| 331 | * Init thread quit pipe. |
| 332 | * |
| 333 | * Return -1 on error or 0 if all pipes are created. |
| 334 | */ |
| 335 | static int init_thread_quit_pipe(void) |
| 336 | { |
| 337 | int ret; |
| 338 | |
| 339 | ret = pipe2(thread_quit_pipe, O_CLOEXEC); |
| 340 | if (ret < 0) { |
| 341 | perror("thread quit pipe"); |
| 342 | goto error; |
| 343 | } |
| 344 | |
| 345 | error: |
| 346 | return ret; |
| 347 | } |
| 348 | |
| 349 | /* |
| 350 | * Complete teardown of a kernel session. This free all data structure related |
| 351 | * to a kernel session and update counter. |
| 352 | */ |
| 353 | static void teardown_kernel_session(struct ltt_session *session) |
| 354 | { |
| 355 | if (!session->kernel_session) { |
| 356 | DBG3("No kernel session when tearingdown session"); |
| 357 | return; |
| 358 | } |
| 359 | |
| 360 | DBG("Tearing down kernel session"); |
| 361 | |
| 362 | /* |
| 363 | * If a custom kernel consumer was registered, close the socket before |
| 364 | * tearing down the complete kernel session structure |
| 365 | */ |
| 366 | if (session->kernel_session->consumer_fd != kconsumer_data.cmd_sock) { |
| 367 | lttcomm_close_unix_sock(session->kernel_session->consumer_fd); |
| 368 | } |
| 369 | |
| 370 | trace_kernel_destroy_session(session->kernel_session); |
| 371 | } |
| 372 | |
| 373 | /* |
| 374 | * Complete teardown of all UST sessions. This will free everything on his path |
| 375 | * and destroy the core essence of all ust sessions :) |
| 376 | */ |
| 377 | static void teardown_ust_session(struct ltt_session *session) |
| 378 | { |
| 379 | int ret; |
| 380 | |
| 381 | if (!session->ust_session) { |
| 382 | DBG3("No UST session when tearingdown session"); |
| 383 | return; |
| 384 | } |
| 385 | |
| 386 | DBG("Tearing down UST session(s)"); |
| 387 | |
| 388 | ret = ust_app_destroy_trace_all(session->ust_session); |
| 389 | if (ret) { |
| 390 | ERR("Error in ust_app_destroy_trace_all"); |
| 391 | } |
| 392 | |
| 393 | trace_ust_destroy_session(session->ust_session); |
| 394 | } |
| 395 | |
| 396 | /* |
| 397 | * Stop all threads by closing the thread quit pipe. |
| 398 | */ |
| 399 | static void stop_threads(void) |
| 400 | { |
| 401 | int ret; |
| 402 | |
| 403 | /* Stopping all threads */ |
| 404 | DBG("Terminating all threads"); |
| 405 | ret = notify_thread_pipe(thread_quit_pipe[1]); |
| 406 | if (ret < 0) { |
| 407 | ERR("write error on thread quit pipe"); |
| 408 | } |
| 409 | |
| 410 | /* Dispatch thread */ |
| 411 | dispatch_thread_exit = 1; |
| 412 | futex_nto1_wake(&ust_cmd_queue.futex); |
| 413 | } |
| 414 | |
| 415 | /* |
| 416 | * Cleanup the daemon |
| 417 | */ |
| 418 | static void cleanup(void) |
| 419 | { |
| 420 | int ret; |
| 421 | char *cmd; |
| 422 | struct ltt_session *sess, *stmp; |
| 423 | |
| 424 | DBG("Cleaning up"); |
| 425 | |
| 426 | if (is_root) { |
| 427 | DBG("Removing %s directory", LTTNG_RUNDIR); |
| 428 | ret = asprintf(&cmd, "rm -rf " LTTNG_RUNDIR); |
| 429 | if (ret < 0) { |
| 430 | ERR("asprintf failed. Something is really wrong!"); |
| 431 | } |
| 432 | |
| 433 | /* Remove lttng run directory */ |
| 434 | ret = system(cmd); |
| 435 | if (ret < 0) { |
| 436 | ERR("Unable to clean " LTTNG_RUNDIR); |
| 437 | } |
| 438 | } |
| 439 | |
| 440 | DBG("Cleaning up all session"); |
| 441 | |
| 442 | /* Destroy session list mutex */ |
| 443 | if (session_list_ptr != NULL) { |
| 444 | pthread_mutex_destroy(&session_list_ptr->lock); |
| 445 | |
| 446 | /* Cleanup ALL session */ |
| 447 | cds_list_for_each_entry_safe(sess, stmp, |
| 448 | &session_list_ptr->head, list) { |
| 449 | teardown_kernel_session(sess); |
| 450 | teardown_ust_session(sess); |
| 451 | free(sess); |
| 452 | } |
| 453 | } |
| 454 | |
| 455 | DBG("Closing all UST sockets"); |
| 456 | ust_app_clean_list(); |
| 457 | |
| 458 | pthread_mutex_destroy(&kconsumer_data.pid_mutex); |
| 459 | |
| 460 | DBG("Closing kernel fd"); |
| 461 | close(kernel_tracer_fd); |
| 462 | |
| 463 | if (is_root) { |
| 464 | DBG("Unloading kernel modules"); |
| 465 | modprobe_remove_kernel_modules(); |
| 466 | } |
| 467 | |
| 468 | close(thread_quit_pipe[0]); |
| 469 | close(thread_quit_pipe[1]); |
| 470 | |
| 471 | /* <fun> */ |
| 472 | MSG("%c[%d;%dm*** assert failed :-) *** ==> %c[%dm%c[%d;%dm" |
| 473 | "Matthew, BEET driven development works!%c[%dm", |
| 474 | 27, 1, 31, 27, 0, 27, 1, 33, 27, 0); |
| 475 | /* </fun> */ |
| 476 | } |
| 477 | |
| 478 | /* |
| 479 | * Send data on a unix socket using the liblttsessiondcomm API. |
| 480 | * |
| 481 | * Return lttcomm error code. |
| 482 | */ |
| 483 | static int send_unix_sock(int sock, void *buf, size_t len) |
| 484 | { |
| 485 | /* Check valid length */ |
| 486 | if (len <= 0) { |
| 487 | return -1; |
| 488 | } |
| 489 | |
| 490 | return lttcomm_send_unix_sock(sock, buf, len); |
| 491 | } |
| 492 | |
| 493 | /* |
| 494 | * Free memory of a command context structure. |
| 495 | */ |
| 496 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
| 497 | { |
| 498 | DBG("Clean command context structure"); |
| 499 | if (*cmd_ctx) { |
| 500 | if ((*cmd_ctx)->llm) { |
| 501 | free((*cmd_ctx)->llm); |
| 502 | } |
| 503 | if ((*cmd_ctx)->lsm) { |
| 504 | free((*cmd_ctx)->lsm); |
| 505 | } |
| 506 | free(*cmd_ctx); |
| 507 | *cmd_ctx = NULL; |
| 508 | } |
| 509 | } |
| 510 | |
| 511 | /* |
| 512 | * Send all stream fds of kernel channel to the consumer. |
| 513 | */ |
| 514 | static int send_kconsumer_channel_streams(struct consumer_data *consumer_data, |
| 515 | int sock, struct ltt_kernel_channel *channel) |
| 516 | { |
| 517 | int ret; |
| 518 | struct ltt_kernel_stream *stream; |
| 519 | struct lttcomm_consumer_msg lkm; |
| 520 | |
| 521 | DBG("Sending streams of channel %s to kernel consumer", |
| 522 | channel->channel->name); |
| 523 | |
| 524 | /* Send channel */ |
| 525 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; |
| 526 | lkm.u.channel.channel_key = channel->fd; |
| 527 | lkm.u.channel.max_sb_size = channel->channel->attr.subbuf_size; |
| 528 | lkm.u.channel.mmap_len = 0; /* for kernel */ |
| 529 | DBG("Sending channel %d to consumer", lkm.u.channel.channel_key); |
| 530 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
| 531 | if (ret < 0) { |
| 532 | perror("send consumer channel"); |
| 533 | goto error; |
| 534 | } |
| 535 | |
| 536 | /* Send streams */ |
| 537 | cds_list_for_each_entry(stream, &channel->stream_list.head, list) { |
| 538 | if (!stream->fd) { |
| 539 | continue; |
| 540 | } |
| 541 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; |
| 542 | lkm.u.stream.channel_key = channel->fd; |
| 543 | lkm.u.stream.stream_key = stream->fd; |
| 544 | lkm.u.stream.state = stream->state; |
| 545 | lkm.u.stream.output = channel->channel->attr.output; |
| 546 | lkm.u.stream.mmap_len = 0; /* for kernel */ |
| 547 | strncpy(lkm.u.stream.path_name, stream->pathname, PATH_MAX - 1); |
| 548 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; |
| 549 | DBG("Sending stream %d to consumer", lkm.u.stream.stream_key); |
| 550 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
| 551 | if (ret < 0) { |
| 552 | perror("send consumer stream"); |
| 553 | goto error; |
| 554 | } |
| 555 | ret = lttcomm_send_fds_unix_sock(sock, &stream->fd, 1); |
| 556 | if (ret < 0) { |
| 557 | perror("send consumer stream ancillary data"); |
| 558 | goto error; |
| 559 | } |
| 560 | } |
| 561 | |
| 562 | DBG("consumer channel streams sent"); |
| 563 | |
| 564 | return 0; |
| 565 | |
| 566 | error: |
| 567 | return ret; |
| 568 | } |
| 569 | |
| 570 | /* |
| 571 | * Send all stream fds of the kernel session to the consumer. |
| 572 | */ |
| 573 | static int send_kconsumer_session_streams(struct consumer_data *consumer_data, |
| 574 | struct ltt_kernel_session *session) |
| 575 | { |
| 576 | int ret; |
| 577 | struct ltt_kernel_channel *chan; |
| 578 | struct lttcomm_consumer_msg lkm; |
| 579 | int sock = session->consumer_fd; |
| 580 | |
| 581 | DBG("Sending metadata stream fd"); |
| 582 | |
| 583 | /* Extra protection. It's NOT supposed to be set to 0 at this point */ |
| 584 | if (session->consumer_fd == 0) { |
| 585 | session->consumer_fd = consumer_data->cmd_sock; |
| 586 | } |
| 587 | |
| 588 | if (session->metadata_stream_fd != 0) { |
| 589 | /* Send metadata channel fd */ |
| 590 | lkm.cmd_type = LTTNG_CONSUMER_ADD_CHANNEL; |
| 591 | lkm.u.channel.channel_key = session->metadata->fd; |
| 592 | lkm.u.channel.max_sb_size = session->metadata->conf->attr.subbuf_size; |
| 593 | lkm.u.channel.mmap_len = 0; /* for kernel */ |
| 594 | DBG("Sending metadata channel %d to consumer", lkm.u.stream.stream_key); |
| 595 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
| 596 | if (ret < 0) { |
| 597 | perror("send consumer channel"); |
| 598 | goto error; |
| 599 | } |
| 600 | |
| 601 | /* Send metadata stream fd */ |
| 602 | lkm.cmd_type = LTTNG_CONSUMER_ADD_STREAM; |
| 603 | lkm.u.stream.channel_key = session->metadata->fd; |
| 604 | lkm.u.stream.stream_key = session->metadata_stream_fd; |
| 605 | lkm.u.stream.state = LTTNG_CONSUMER_ACTIVE_STREAM; |
| 606 | lkm.u.stream.output = DEFAULT_KERNEL_CHANNEL_OUTPUT; |
| 607 | lkm.u.stream.mmap_len = 0; /* for kernel */ |
| 608 | strncpy(lkm.u.stream.path_name, session->metadata->pathname, PATH_MAX - 1); |
| 609 | lkm.u.stream.path_name[PATH_MAX - 1] = '\0'; |
| 610 | DBG("Sending metadata stream %d to consumer", lkm.u.stream.stream_key); |
| 611 | ret = lttcomm_send_unix_sock(sock, &lkm, sizeof(lkm)); |
| 612 | if (ret < 0) { |
| 613 | perror("send consumer stream"); |
| 614 | goto error; |
| 615 | } |
| 616 | ret = lttcomm_send_fds_unix_sock(sock, &session->metadata_stream_fd, 1); |
| 617 | if (ret < 0) { |
| 618 | perror("send consumer stream"); |
| 619 | goto error; |
| 620 | } |
| 621 | } |
| 622 | |
| 623 | cds_list_for_each_entry(chan, &session->channel_list.head, list) { |
| 624 | ret = send_kconsumer_channel_streams(consumer_data, sock, chan); |
| 625 | if (ret < 0) { |
| 626 | goto error; |
| 627 | } |
| 628 | } |
| 629 | |
| 630 | DBG("consumer fds (metadata and channel streams) sent"); |
| 631 | |
| 632 | return 0; |
| 633 | |
| 634 | error: |
| 635 | return ret; |
| 636 | } |
| 637 | |
| 638 | /* |
| 639 | * Notify UST applications using the shm mmap futex. |
| 640 | */ |
| 641 | static int notify_ust_apps(int active) |
| 642 | { |
| 643 | char *wait_shm_mmap; |
| 644 | |
| 645 | DBG("Notifying applications of session daemon state: %d", active); |
| 646 | |
| 647 | /* See shm.c for this call implying mmap, shm and futex calls */ |
| 648 | wait_shm_mmap = shm_ust_get_mmap(wait_shm_path, is_root); |
| 649 | if (wait_shm_mmap == NULL) { |
| 650 | goto error; |
| 651 | } |
| 652 | |
| 653 | /* Wake waiting process */ |
| 654 | futex_wait_update((int32_t *) wait_shm_mmap, active); |
| 655 | |
| 656 | /* Apps notified successfully */ |
| 657 | return 0; |
| 658 | |
| 659 | error: |
| 660 | return -1; |
| 661 | } |
| 662 | |
| 663 | /* |
| 664 | * Setup the outgoing data buffer for the response (llm) by allocating the |
| 665 | * right amount of memory and copying the original information from the lsm |
| 666 | * structure. |
| 667 | * |
| 668 | * Return total size of the buffer pointed by buf. |
| 669 | */ |
| 670 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, size_t size) |
| 671 | { |
| 672 | int ret, buf_size; |
| 673 | |
| 674 | buf_size = size; |
| 675 | |
| 676 | cmd_ctx->llm = zmalloc(sizeof(struct lttcomm_lttng_msg) + buf_size); |
| 677 | if (cmd_ctx->llm == NULL) { |
| 678 | perror("zmalloc"); |
| 679 | ret = -ENOMEM; |
| 680 | goto error; |
| 681 | } |
| 682 | |
| 683 | /* Copy common data */ |
| 684 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; |
| 685 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
| 686 | |
| 687 | cmd_ctx->llm->data_size = size; |
| 688 | cmd_ctx->lttng_msg_size = sizeof(struct lttcomm_lttng_msg) + buf_size; |
| 689 | |
| 690 | return buf_size; |
| 691 | |
| 692 | error: |
| 693 | return ret; |
| 694 | } |
| 695 | |
| 696 | /* |
| 697 | * Update the kernel poll set of all channel fd available over all tracing |
| 698 | * session. Add the wakeup pipe at the end of the set. |
| 699 | */ |
| 700 | static int update_kernel_poll(struct lttng_poll_event *events) |
| 701 | { |
| 702 | int ret; |
| 703 | struct ltt_session *session; |
| 704 | struct ltt_kernel_channel *channel; |
| 705 | |
| 706 | DBG("Updating kernel poll set"); |
| 707 | |
| 708 | session_lock_list(); |
| 709 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
| 710 | session_lock(session); |
| 711 | if (session->kernel_session == NULL) { |
| 712 | session_unlock(session); |
| 713 | continue; |
| 714 | } |
| 715 | |
| 716 | cds_list_for_each_entry(channel, |
| 717 | &session->kernel_session->channel_list.head, list) { |
| 718 | /* Add channel fd to the kernel poll set */ |
| 719 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); |
| 720 | if (ret < 0) { |
| 721 | session_unlock(session); |
| 722 | goto error; |
| 723 | } |
| 724 | DBG("Channel fd %d added to kernel set", channel->fd); |
| 725 | } |
| 726 | session_unlock(session); |
| 727 | } |
| 728 | session_unlock_list(); |
| 729 | |
| 730 | return 0; |
| 731 | |
| 732 | error: |
| 733 | session_unlock_list(); |
| 734 | return -1; |
| 735 | } |
| 736 | |
| 737 | /* |
| 738 | * Find the channel fd from 'fd' over all tracing session. When found, check |
| 739 | * for new channel stream and send those stream fds to the kernel consumer. |
| 740 | * |
| 741 | * Useful for CPU hotplug feature. |
| 742 | */ |
| 743 | static int update_kernel_stream(struct consumer_data *consumer_data, int fd) |
| 744 | { |
| 745 | int ret = 0; |
| 746 | struct ltt_session *session; |
| 747 | struct ltt_kernel_channel *channel; |
| 748 | |
| 749 | DBG("Updating kernel streams for channel fd %d", fd); |
| 750 | |
| 751 | session_lock_list(); |
| 752 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
| 753 | session_lock(session); |
| 754 | if (session->kernel_session == NULL) { |
| 755 | session_unlock(session); |
| 756 | continue; |
| 757 | } |
| 758 | |
| 759 | /* This is not suppose to be 0 but this is an extra security check */ |
| 760 | if (session->kernel_session->consumer_fd == 0) { |
| 761 | session->kernel_session->consumer_fd = consumer_data->cmd_sock; |
| 762 | } |
| 763 | |
| 764 | cds_list_for_each_entry(channel, |
| 765 | &session->kernel_session->channel_list.head, list) { |
| 766 | if (channel->fd == fd) { |
| 767 | DBG("Channel found, updating kernel streams"); |
| 768 | ret = kernel_open_channel_stream(channel); |
| 769 | if (ret < 0) { |
| 770 | goto error; |
| 771 | } |
| 772 | |
| 773 | /* |
| 774 | * Have we already sent fds to the consumer? If yes, it means |
| 775 | * that tracing is started so it is safe to send our updated |
| 776 | * stream fds. |
| 777 | */ |
| 778 | if (session->kernel_session->consumer_fds_sent == 1) { |
| 779 | ret = send_kconsumer_channel_streams(consumer_data, |
| 780 | session->kernel_session->consumer_fd, channel); |
| 781 | if (ret < 0) { |
| 782 | goto error; |
| 783 | } |
| 784 | } |
| 785 | goto error; |
| 786 | } |
| 787 | } |
| 788 | session_unlock(session); |
| 789 | } |
| 790 | session_unlock_list(); |
| 791 | return ret; |
| 792 | |
| 793 | error: |
| 794 | session_unlock(session); |
| 795 | session_unlock_list(); |
| 796 | return ret; |
| 797 | } |
| 798 | |
| 799 | /* |
| 800 | * For each tracing session, update newly registered apps. |
| 801 | */ |
| 802 | static void update_ust_app(int app_sock) |
| 803 | { |
| 804 | struct ltt_session *sess, *stmp; |
| 805 | |
| 806 | /* For all tracing session(s) */ |
| 807 | cds_list_for_each_entry_safe(sess, stmp, &session_list_ptr->head, list) { |
| 808 | if (sess->ust_session) { |
| 809 | ust_app_global_update(sess->ust_session, app_sock); |
| 810 | } |
| 811 | } |
| 812 | } |
| 813 | |
| 814 | /* |
| 815 | * This thread manage event coming from the kernel. |
| 816 | * |
| 817 | * Features supported in this thread: |
| 818 | * -) CPU Hotplug |
| 819 | */ |
| 820 | static void *thread_manage_kernel(void *data) |
| 821 | { |
| 822 | int ret, i, pollfd, update_poll_flag = 1; |
| 823 | uint32_t revents, nb_fd; |
| 824 | char tmp; |
| 825 | struct lttng_poll_event events; |
| 826 | |
| 827 | DBG("Thread manage kernel started"); |
| 828 | |
| 829 | ret = create_thread_poll_set(&events, 2); |
| 830 | if (ret < 0) { |
| 831 | goto error; |
| 832 | } |
| 833 | |
| 834 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); |
| 835 | if (ret < 0) { |
| 836 | goto error; |
| 837 | } |
| 838 | |
| 839 | while (1) { |
| 840 | if (update_poll_flag == 1) { |
| 841 | /* |
| 842 | * Reset number of fd in the poll set. Always 2 since there is the thread |
| 843 | * quit pipe and the kernel pipe. |
| 844 | */ |
| 845 | events.nb_fd = 2; |
| 846 | |
| 847 | ret = update_kernel_poll(&events); |
| 848 | if (ret < 0) { |
| 849 | goto error; |
| 850 | } |
| 851 | update_poll_flag = 0; |
| 852 | } |
| 853 | |
| 854 | nb_fd = LTTNG_POLL_GETNB(&events); |
| 855 | |
| 856 | DBG("Thread kernel polling on %d fds", nb_fd); |
| 857 | |
| 858 | /* Zeroed the poll events */ |
| 859 | lttng_poll_reset(&events); |
| 860 | |
| 861 | /* Poll infinite value of time */ |
| 862 | ret = lttng_poll_wait(&events, -1); |
| 863 | if (ret < 0) { |
| 864 | goto error; |
| 865 | } else if (ret == 0) { |
| 866 | /* Should not happen since timeout is infinite */ |
| 867 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
| 868 | "This should not have happened! Continuing..."); |
| 869 | continue; |
| 870 | } |
| 871 | |
| 872 | for (i = 0; i < nb_fd; i++) { |
| 873 | /* Fetch once the poll data */ |
| 874 | revents = LTTNG_POLL_GETEV(&events, i); |
| 875 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 876 | |
| 877 | /* Thread quit pipe has been closed. Killing thread. */ |
| 878 | ret = check_thread_quit_pipe(pollfd, revents); |
| 879 | if (ret) { |
| 880 | goto error; |
| 881 | } |
| 882 | |
| 883 | /* Check for data on kernel pipe */ |
| 884 | if (pollfd == kernel_poll_pipe[0] && (revents & LPOLLIN)) { |
| 885 | ret = read(kernel_poll_pipe[0], &tmp, 1); |
| 886 | update_poll_flag = 1; |
| 887 | continue; |
| 888 | } else { |
| 889 | /* |
| 890 | * New CPU detected by the kernel. Adding kernel stream to |
| 891 | * kernel session and updating the kernel consumer |
| 892 | */ |
| 893 | if (revents & LPOLLIN) { |
| 894 | ret = update_kernel_stream(&kconsumer_data, pollfd); |
| 895 | if (ret < 0) { |
| 896 | continue; |
| 897 | } |
| 898 | break; |
| 899 | /* |
| 900 | * TODO: We might want to handle the LPOLLERR | LPOLLHUP |
| 901 | * and unregister kernel stream at this point. |
| 902 | */ |
| 903 | } |
| 904 | } |
| 905 | } |
| 906 | } |
| 907 | |
| 908 | error: |
| 909 | DBG("Kernel thread dying"); |
| 910 | close(kernel_poll_pipe[0]); |
| 911 | close(kernel_poll_pipe[1]); |
| 912 | |
| 913 | lttng_poll_clean(&events); |
| 914 | |
| 915 | return NULL; |
| 916 | } |
| 917 | |
| 918 | /* |
| 919 | * This thread manage the consumer error sent back to the session daemon. |
| 920 | */ |
| 921 | static void *thread_manage_consumer(void *data) |
| 922 | { |
| 923 | int sock = 0, i, ret, pollfd; |
| 924 | uint32_t revents, nb_fd; |
| 925 | enum lttcomm_return_code code; |
| 926 | struct lttng_poll_event events; |
| 927 | struct consumer_data *consumer_data = data; |
| 928 | |
| 929 | DBG("[thread] Manage consumer started"); |
| 930 | |
| 931 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
| 932 | if (ret < 0) { |
| 933 | goto error; |
| 934 | } |
| 935 | |
| 936 | /* |
| 937 | * Pass 2 as size here for the thread quit pipe and kconsumerd_err_sock. |
| 938 | * Nothing more will be added to this poll set. |
| 939 | */ |
| 940 | ret = create_thread_poll_set(&events, 2); |
| 941 | if (ret < 0) { |
| 942 | goto error; |
| 943 | } |
| 944 | |
| 945 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
| 946 | if (ret < 0) { |
| 947 | goto error; |
| 948 | } |
| 949 | |
| 950 | nb_fd = LTTNG_POLL_GETNB(&events); |
| 951 | |
| 952 | /* Inifinite blocking call, waiting for transmission */ |
| 953 | ret = lttng_poll_wait(&events, -1); |
| 954 | if (ret < 0) { |
| 955 | goto error; |
| 956 | } |
| 957 | |
| 958 | for (i = 0; i < nb_fd; i++) { |
| 959 | /* Fetch once the poll data */ |
| 960 | revents = LTTNG_POLL_GETEV(&events, i); |
| 961 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 962 | |
| 963 | /* Thread quit pipe has been closed. Killing thread. */ |
| 964 | ret = check_thread_quit_pipe(pollfd, revents); |
| 965 | if (ret) { |
| 966 | goto error; |
| 967 | } |
| 968 | |
| 969 | /* Event on the registration socket */ |
| 970 | if (pollfd == consumer_data->err_sock) { |
| 971 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 972 | ERR("consumer err socket poll error"); |
| 973 | goto error; |
| 974 | } |
| 975 | } |
| 976 | } |
| 977 | |
| 978 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
| 979 | if (sock < 0) { |
| 980 | goto error; |
| 981 | } |
| 982 | |
| 983 | DBG2("Receiving code from consumer err_sock"); |
| 984 | |
| 985 | /* Getting status code from kconsumerd */ |
| 986 | ret = lttcomm_recv_unix_sock(sock, &code, |
| 987 | sizeof(enum lttcomm_return_code)); |
| 988 | if (ret <= 0) { |
| 989 | goto error; |
| 990 | } |
| 991 | |
| 992 | if (code == CONSUMERD_COMMAND_SOCK_READY) { |
| 993 | consumer_data->cmd_sock = |
| 994 | lttcomm_connect_unix_sock(consumer_data->cmd_unix_sock_path); |
| 995 | if (consumer_data->cmd_sock < 0) { |
| 996 | sem_post(&consumer_data->sem); |
| 997 | PERROR("consumer connect"); |
| 998 | goto error; |
| 999 | } |
| 1000 | /* Signal condition to tell that the kconsumerd is ready */ |
| 1001 | sem_post(&consumer_data->sem); |
| 1002 | DBG("consumer command socket ready"); |
| 1003 | } else { |
| 1004 | ERR("consumer error when waiting for SOCK_READY : %s", |
| 1005 | lttcomm_get_readable_code(-code)); |
| 1006 | goto error; |
| 1007 | } |
| 1008 | |
| 1009 | /* Remove the kconsumerd error sock since we've established a connexion */ |
| 1010 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
| 1011 | if (ret < 0) { |
| 1012 | goto error; |
| 1013 | } |
| 1014 | |
| 1015 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
| 1016 | if (ret < 0) { |
| 1017 | goto error; |
| 1018 | } |
| 1019 | |
| 1020 | /* Update number of fd */ |
| 1021 | nb_fd = LTTNG_POLL_GETNB(&events); |
| 1022 | |
| 1023 | /* Inifinite blocking call, waiting for transmission */ |
| 1024 | ret = lttng_poll_wait(&events, -1); |
| 1025 | if (ret < 0) { |
| 1026 | goto error; |
| 1027 | } |
| 1028 | |
| 1029 | for (i = 0; i < nb_fd; i++) { |
| 1030 | /* Fetch once the poll data */ |
| 1031 | revents = LTTNG_POLL_GETEV(&events, i); |
| 1032 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 1033 | |
| 1034 | /* Thread quit pipe has been closed. Killing thread. */ |
| 1035 | ret = check_thread_quit_pipe(pollfd, revents); |
| 1036 | if (ret) { |
| 1037 | goto error; |
| 1038 | } |
| 1039 | |
| 1040 | /* Event on the kconsumerd socket */ |
| 1041 | if (pollfd == sock) { |
| 1042 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 1043 | ERR("consumer err socket second poll error"); |
| 1044 | goto error; |
| 1045 | } |
| 1046 | } |
| 1047 | } |
| 1048 | |
| 1049 | /* Wait for any kconsumerd error */ |
| 1050 | ret = lttcomm_recv_unix_sock(sock, &code, |
| 1051 | sizeof(enum lttcomm_return_code)); |
| 1052 | if (ret <= 0) { |
| 1053 | ERR("consumer closed the command socket"); |
| 1054 | goto error; |
| 1055 | } |
| 1056 | |
| 1057 | ERR("consumer return code : %s", lttcomm_get_readable_code(-code)); |
| 1058 | |
| 1059 | error: |
| 1060 | DBG("consumer thread dying"); |
| 1061 | close(consumer_data->err_sock); |
| 1062 | close(consumer_data->cmd_sock); |
| 1063 | close(sock); |
| 1064 | |
| 1065 | unlink(consumer_data->err_unix_sock_path); |
| 1066 | unlink(consumer_data->cmd_unix_sock_path); |
| 1067 | consumer_data->pid = 0; |
| 1068 | |
| 1069 | lttng_poll_clean(&events); |
| 1070 | |
| 1071 | return NULL; |
| 1072 | } |
| 1073 | |
| 1074 | /* |
| 1075 | * This thread manage application communication. |
| 1076 | */ |
| 1077 | static void *thread_manage_apps(void *data) |
| 1078 | { |
| 1079 | int i, ret, pollfd; |
| 1080 | uint32_t revents, nb_fd; |
| 1081 | struct ust_command ust_cmd; |
| 1082 | struct lttng_poll_event events; |
| 1083 | |
| 1084 | DBG("[thread] Manage application started"); |
| 1085 | |
| 1086 | rcu_register_thread(); |
| 1087 | rcu_thread_online(); |
| 1088 | |
| 1089 | ret = create_thread_poll_set(&events, 2); |
| 1090 | if (ret < 0) { |
| 1091 | goto error; |
| 1092 | } |
| 1093 | |
| 1094 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
| 1095 | if (ret < 0) { |
| 1096 | goto error; |
| 1097 | } |
| 1098 | |
| 1099 | while (1) { |
| 1100 | /* Zeroed the events structure */ |
| 1101 | lttng_poll_reset(&events); |
| 1102 | |
| 1103 | nb_fd = LTTNG_POLL_GETNB(&events); |
| 1104 | |
| 1105 | DBG("Apps thread polling on %d fds", nb_fd); |
| 1106 | |
| 1107 | /* Inifinite blocking call, waiting for transmission */ |
| 1108 | ret = lttng_poll_wait(&events, -1); |
| 1109 | if (ret < 0) { |
| 1110 | goto error; |
| 1111 | } |
| 1112 | |
| 1113 | for (i = 0; i < nb_fd; i++) { |
| 1114 | /* Fetch once the poll data */ |
| 1115 | revents = LTTNG_POLL_GETEV(&events, i); |
| 1116 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 1117 | |
| 1118 | /* Thread quit pipe has been closed. Killing thread. */ |
| 1119 | ret = check_thread_quit_pipe(pollfd, revents); |
| 1120 | if (ret) { |
| 1121 | goto error; |
| 1122 | } |
| 1123 | |
| 1124 | /* Inspect the apps cmd pipe */ |
| 1125 | if (pollfd == apps_cmd_pipe[0]) { |
| 1126 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 1127 | ERR("Apps command pipe error"); |
| 1128 | goto error; |
| 1129 | } else if (revents & LPOLLIN) { |
| 1130 | /* Empty pipe */ |
| 1131 | ret = read(apps_cmd_pipe[0], &ust_cmd, sizeof(ust_cmd)); |
| 1132 | if (ret < 0 || ret < sizeof(ust_cmd)) { |
| 1133 | perror("read apps cmd pipe"); |
| 1134 | goto error; |
| 1135 | } |
| 1136 | |
| 1137 | /* Register applicaton to the session daemon */ |
| 1138 | ret = ust_app_register(&ust_cmd.reg_msg, |
| 1139 | ust_cmd.sock); |
| 1140 | if (ret == -ENOMEM) { |
| 1141 | goto error; |
| 1142 | } else if (ret < 0) { |
| 1143 | break; |
| 1144 | } |
| 1145 | |
| 1146 | /* |
| 1147 | * Add channel(s) and event(s) to newly registered apps |
| 1148 | * from lttng global UST domain. |
| 1149 | */ |
| 1150 | update_ust_app(ust_cmd.sock); |
| 1151 | |
| 1152 | ret = ustctl_register_done(ust_cmd.sock); |
| 1153 | if (ret < 0) { |
| 1154 | /* |
| 1155 | * If the registration is not possible, we simply |
| 1156 | * unregister the apps and continue |
| 1157 | */ |
| 1158 | ust_app_unregister(ust_cmd.sock); |
| 1159 | } else { |
| 1160 | /* |
| 1161 | * We just need here to monitor the close of the UST |
| 1162 | * socket and poll set monitor those by default. |
| 1163 | */ |
| 1164 | ret = lttng_poll_add(&events, ust_cmd.sock, 0); |
| 1165 | if (ret < 0) { |
| 1166 | goto error; |
| 1167 | } |
| 1168 | |
| 1169 | DBG("Apps with sock %d added to poll set", |
| 1170 | ust_cmd.sock); |
| 1171 | } |
| 1172 | |
| 1173 | break; |
| 1174 | } |
| 1175 | } else { |
| 1176 | /* |
| 1177 | * At this point, we know that a registered application made |
| 1178 | * the event at poll_wait. |
| 1179 | */ |
| 1180 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 1181 | /* Removing from the poll set */ |
| 1182 | ret = lttng_poll_del(&events, pollfd); |
| 1183 | if (ret < 0) { |
| 1184 | goto error; |
| 1185 | } |
| 1186 | |
| 1187 | /* Socket closed on remote end. */ |
| 1188 | ust_app_unregister(pollfd); |
| 1189 | break; |
| 1190 | } |
| 1191 | } |
| 1192 | } |
| 1193 | } |
| 1194 | |
| 1195 | error: |
| 1196 | DBG("Application communication apps dying"); |
| 1197 | close(apps_cmd_pipe[0]); |
| 1198 | close(apps_cmd_pipe[1]); |
| 1199 | |
| 1200 | lttng_poll_clean(&events); |
| 1201 | |
| 1202 | rcu_thread_offline(); |
| 1203 | rcu_unregister_thread(); |
| 1204 | return NULL; |
| 1205 | } |
| 1206 | |
| 1207 | /* |
| 1208 | * Dispatch request from the registration threads to the application |
| 1209 | * communication thread. |
| 1210 | */ |
| 1211 | static void *thread_dispatch_ust_registration(void *data) |
| 1212 | { |
| 1213 | int ret; |
| 1214 | struct cds_wfq_node *node; |
| 1215 | struct ust_command *ust_cmd = NULL; |
| 1216 | |
| 1217 | DBG("[thread] Dispatch UST command started"); |
| 1218 | |
| 1219 | while (!dispatch_thread_exit) { |
| 1220 | /* Atomically prepare the queue futex */ |
| 1221 | futex_nto1_prepare(&ust_cmd_queue.futex); |
| 1222 | |
| 1223 | do { |
| 1224 | /* Dequeue command for registration */ |
| 1225 | node = cds_wfq_dequeue_blocking(&ust_cmd_queue.queue); |
| 1226 | if (node == NULL) { |
| 1227 | DBG("Woken up but nothing in the UST command queue"); |
| 1228 | /* Continue thread execution */ |
| 1229 | break; |
| 1230 | } |
| 1231 | |
| 1232 | ust_cmd = caa_container_of(node, struct ust_command, node); |
| 1233 | |
| 1234 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
| 1235 | " gid:%d sock:%d name:%s (version %d.%d)", |
| 1236 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, |
| 1237 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, |
| 1238 | ust_cmd->sock, ust_cmd->reg_msg.name, |
| 1239 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); |
| 1240 | /* |
| 1241 | * Inform apps thread of the new application registration. This |
| 1242 | * call is blocking so we can be assured that the data will be read |
| 1243 | * at some point in time or wait to the end of the world :) |
| 1244 | */ |
| 1245 | ret = write(apps_cmd_pipe[1], ust_cmd, |
| 1246 | sizeof(struct ust_command)); |
| 1247 | if (ret < 0) { |
| 1248 | perror("write apps cmd pipe"); |
| 1249 | if (errno == EBADF) { |
| 1250 | /* |
| 1251 | * We can't inform the application thread to process |
| 1252 | * registration. We will exit or else application |
| 1253 | * registration will not occur and tracing will never |
| 1254 | * start. |
| 1255 | */ |
| 1256 | goto error; |
| 1257 | } |
| 1258 | } |
| 1259 | free(ust_cmd); |
| 1260 | } while (node != NULL); |
| 1261 | |
| 1262 | /* Futex wait on queue. Blocking call on futex() */ |
| 1263 | futex_nto1_wait(&ust_cmd_queue.futex); |
| 1264 | } |
| 1265 | |
| 1266 | error: |
| 1267 | DBG("Dispatch thread dying"); |
| 1268 | return NULL; |
| 1269 | } |
| 1270 | |
| 1271 | /* |
| 1272 | * This thread manage application registration. |
| 1273 | */ |
| 1274 | static void *thread_registration_apps(void *data) |
| 1275 | { |
| 1276 | int sock = 0, i, ret, pollfd; |
| 1277 | uint32_t revents, nb_fd; |
| 1278 | struct lttng_poll_event events; |
| 1279 | /* |
| 1280 | * Get allocated in this thread, enqueued to a global queue, dequeued and |
| 1281 | * freed in the manage apps thread. |
| 1282 | */ |
| 1283 | struct ust_command *ust_cmd = NULL; |
| 1284 | |
| 1285 | DBG("[thread] Manage application registration started"); |
| 1286 | |
| 1287 | ret = lttcomm_listen_unix_sock(apps_sock); |
| 1288 | if (ret < 0) { |
| 1289 | goto error; |
| 1290 | } |
| 1291 | |
| 1292 | /* |
| 1293 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing |
| 1294 | * more will be added to this poll set. |
| 1295 | */ |
| 1296 | ret = create_thread_poll_set(&events, 2); |
| 1297 | if (ret < 0) { |
| 1298 | goto error; |
| 1299 | } |
| 1300 | |
| 1301 | /* Add the application registration socket */ |
| 1302 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); |
| 1303 | if (ret < 0) { |
| 1304 | goto error; |
| 1305 | } |
| 1306 | |
| 1307 | /* Notify all applications to register */ |
| 1308 | ret = notify_ust_apps(1); |
| 1309 | if (ret < 0) { |
| 1310 | ERR("Failed to notify applications or create the wait shared memory.\n" |
| 1311 | "Execution continues but there might be problem for already\n" |
| 1312 | "running applications that wishes to register."); |
| 1313 | } |
| 1314 | |
| 1315 | while (1) { |
| 1316 | DBG("Accepting application registration"); |
| 1317 | |
| 1318 | nb_fd = LTTNG_POLL_GETNB(&events); |
| 1319 | |
| 1320 | /* Inifinite blocking call, waiting for transmission */ |
| 1321 | ret = lttng_poll_wait(&events, -1); |
| 1322 | if (ret < 0) { |
| 1323 | goto error; |
| 1324 | } |
| 1325 | |
| 1326 | for (i = 0; i < nb_fd; i++) { |
| 1327 | /* Fetch once the poll data */ |
| 1328 | revents = LTTNG_POLL_GETEV(&events, i); |
| 1329 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 1330 | |
| 1331 | /* Thread quit pipe has been closed. Killing thread. */ |
| 1332 | ret = check_thread_quit_pipe(pollfd, revents); |
| 1333 | if (ret) { |
| 1334 | goto error; |
| 1335 | } |
| 1336 | |
| 1337 | /* Event on the registration socket */ |
| 1338 | if (pollfd == apps_sock) { |
| 1339 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 1340 | ERR("Register apps socket poll error"); |
| 1341 | goto error; |
| 1342 | } else if (revents & LPOLLIN) { |
| 1343 | sock = lttcomm_accept_unix_sock(apps_sock); |
| 1344 | if (sock < 0) { |
| 1345 | goto error; |
| 1346 | } |
| 1347 | |
| 1348 | /* Create UST registration command for enqueuing */ |
| 1349 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
| 1350 | if (ust_cmd == NULL) { |
| 1351 | perror("ust command zmalloc"); |
| 1352 | goto error; |
| 1353 | } |
| 1354 | |
| 1355 | /* |
| 1356 | * Using message-based transmissions to ensure we don't |
| 1357 | * have to deal with partially received messages. |
| 1358 | */ |
| 1359 | ret = lttcomm_recv_unix_sock(sock, &ust_cmd->reg_msg, |
| 1360 | sizeof(struct ust_register_msg)); |
| 1361 | if (ret < 0 || ret < sizeof(struct ust_register_msg)) { |
| 1362 | if (ret < 0) { |
| 1363 | perror("lttcomm_recv_unix_sock register apps"); |
| 1364 | } else { |
| 1365 | ERR("Wrong size received on apps register"); |
| 1366 | } |
| 1367 | free(ust_cmd); |
| 1368 | close(sock); |
| 1369 | continue; |
| 1370 | } |
| 1371 | |
| 1372 | ust_cmd->sock = sock; |
| 1373 | |
| 1374 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
| 1375 | " gid:%d sock:%d name:%s (version %d.%d)", |
| 1376 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, |
| 1377 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, |
| 1378 | ust_cmd->sock, ust_cmd->reg_msg.name, |
| 1379 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); |
| 1380 | |
| 1381 | /* |
| 1382 | * Lock free enqueue the registration request. The red pill |
| 1383 | * has been taken! This apps will be part of the *system*. |
| 1384 | */ |
| 1385 | cds_wfq_enqueue(&ust_cmd_queue.queue, &ust_cmd->node); |
| 1386 | |
| 1387 | /* |
| 1388 | * Wake the registration queue futex. Implicit memory |
| 1389 | * barrier with the exchange in cds_wfq_enqueue. |
| 1390 | */ |
| 1391 | futex_nto1_wake(&ust_cmd_queue.futex); |
| 1392 | } |
| 1393 | } |
| 1394 | } |
| 1395 | } |
| 1396 | |
| 1397 | error: |
| 1398 | DBG("UST Registration thread dying"); |
| 1399 | |
| 1400 | /* Notify that the registration thread is gone */ |
| 1401 | notify_ust_apps(0); |
| 1402 | |
| 1403 | close(apps_sock); |
| 1404 | close(sock); |
| 1405 | unlink(apps_unix_sock_path); |
| 1406 | |
| 1407 | lttng_poll_clean(&events); |
| 1408 | |
| 1409 | return NULL; |
| 1410 | } |
| 1411 | |
| 1412 | /* |
| 1413 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
| 1414 | * exec or it will fails. |
| 1415 | */ |
| 1416 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
| 1417 | { |
| 1418 | int ret; |
| 1419 | struct timespec timeout; |
| 1420 | |
| 1421 | timeout.tv_sec = DEFAULT_SEM_WAIT_TIMEOUT; |
| 1422 | timeout.tv_nsec = 0; |
| 1423 | |
| 1424 | /* Setup semaphore */ |
| 1425 | ret = sem_init(&consumer_data->sem, 0, 0); |
| 1426 | if (ret < 0) { |
| 1427 | PERROR("sem_init consumer semaphore"); |
| 1428 | goto error; |
| 1429 | } |
| 1430 | |
| 1431 | ret = pthread_create(&consumer_data->thread, NULL, |
| 1432 | thread_manage_consumer, consumer_data); |
| 1433 | if (ret != 0) { |
| 1434 | PERROR("pthread_create consumer"); |
| 1435 | ret = -1; |
| 1436 | goto error; |
| 1437 | } |
| 1438 | |
| 1439 | /* Get time for sem_timedwait absolute timeout */ |
| 1440 | ret = clock_gettime(CLOCK_REALTIME, &timeout); |
| 1441 | if (ret < 0) { |
| 1442 | PERROR("clock_gettime spawn consumer"); |
| 1443 | /* Infinite wait for the kconsumerd thread to be ready */ |
| 1444 | ret = sem_wait(&consumer_data->sem); |
| 1445 | } else { |
| 1446 | /* Normal timeout if the gettime was successful */ |
| 1447 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; |
| 1448 | ret = sem_timedwait(&consumer_data->sem, &timeout); |
| 1449 | } |
| 1450 | |
| 1451 | if (ret < 0) { |
| 1452 | if (errno == ETIMEDOUT) { |
| 1453 | /* |
| 1454 | * Call has timed out so we kill the kconsumerd_thread and return |
| 1455 | * an error. |
| 1456 | */ |
| 1457 | ERR("The consumer thread was never ready. Killing it"); |
| 1458 | ret = pthread_cancel(consumer_data->thread); |
| 1459 | if (ret < 0) { |
| 1460 | PERROR("pthread_cancel consumer thread"); |
| 1461 | } |
| 1462 | } else { |
| 1463 | PERROR("semaphore wait failed consumer thread"); |
| 1464 | } |
| 1465 | goto error; |
| 1466 | } |
| 1467 | |
| 1468 | pthread_mutex_lock(&consumer_data->pid_mutex); |
| 1469 | if (consumer_data->pid == 0) { |
| 1470 | ERR("Kconsumerd did not start"); |
| 1471 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
| 1472 | goto error; |
| 1473 | } |
| 1474 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
| 1475 | |
| 1476 | return 0; |
| 1477 | |
| 1478 | error: |
| 1479 | return ret; |
| 1480 | } |
| 1481 | |
| 1482 | /* |
| 1483 | * Join consumer thread |
| 1484 | */ |
| 1485 | static int join_consumer_thread(struct consumer_data *consumer_data) |
| 1486 | { |
| 1487 | void *status; |
| 1488 | int ret; |
| 1489 | |
| 1490 | if (consumer_data->pid != 0) { |
| 1491 | ret = kill(consumer_data->pid, SIGTERM); |
| 1492 | if (ret) { |
| 1493 | ERR("Error killing consumer daemon"); |
| 1494 | return ret; |
| 1495 | } |
| 1496 | return pthread_join(consumer_data->thread, &status); |
| 1497 | } else { |
| 1498 | return 0; |
| 1499 | } |
| 1500 | } |
| 1501 | |
| 1502 | /* |
| 1503 | * Fork and exec a consumer daemon (consumerd). |
| 1504 | * |
| 1505 | * Return pid if successful else -1. |
| 1506 | */ |
| 1507 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
| 1508 | { |
| 1509 | int ret; |
| 1510 | pid_t pid; |
| 1511 | const char *consumer_to_use; |
| 1512 | const char *verbosity; |
| 1513 | struct stat st; |
| 1514 | |
| 1515 | DBG("Spawning consumerd"); |
| 1516 | |
| 1517 | pid = fork(); |
| 1518 | if (pid == 0) { |
| 1519 | /* |
| 1520 | * Exec consumerd. |
| 1521 | */ |
| 1522 | if (opt_verbose > 1 || opt_verbose_consumer) { |
| 1523 | verbosity = "--verbose"; |
| 1524 | } else { |
| 1525 | verbosity = "--quiet"; |
| 1526 | } |
| 1527 | switch (consumer_data->type) { |
| 1528 | case LTTNG_CONSUMER_KERNEL: |
| 1529 | /* |
| 1530 | * Find out which consumerd to execute. We will first |
| 1531 | * try the 64-bit path, then the 32-bit one, then |
| 1532 | * fallback on sessiond's installation directory. |
| 1533 | */ |
| 1534 | if (stat(consumerd64_bin, &st) == 0) { |
| 1535 | consumer_to_use = consumerd64_bin; |
| 1536 | } else if (stat(INSTALL_BIN_PATH "/" CONSUMERD_FILE, &st) == 0) { |
| 1537 | consumer_to_use = INSTALL_BIN_PATH "/" CONSUMERD_FILE; |
| 1538 | } else if (stat(consumerd32_bin, &st) == 0) { |
| 1539 | consumer_to_use = consumerd32_bin; |
| 1540 | } else { |
| 1541 | break; |
| 1542 | } |
| 1543 | DBG("Using kernel consumer at: %s", consumer_to_use); |
| 1544 | execl(consumer_to_use, |
| 1545 | "lttng-consumerd", verbosity, "-k", |
| 1546 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
| 1547 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, |
| 1548 | NULL); |
| 1549 | break; |
| 1550 | case LTTNG_CONSUMER64_UST: |
| 1551 | { |
| 1552 | char *tmpnew = NULL; |
| 1553 | |
| 1554 | if (consumerd64_libdir[0] != '\0') { |
| 1555 | char *tmp; |
| 1556 | size_t tmplen; |
| 1557 | |
| 1558 | tmp = getenv("LD_LIBRARY_PATH"); |
| 1559 | if (!tmp) { |
| 1560 | tmp = ""; |
| 1561 | } |
| 1562 | tmplen = strlen("LD_LIBRARY_PATH=") |
| 1563 | + strlen(consumerd64_libdir) + 1 /* : */ + strlen(tmp); |
| 1564 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
| 1565 | if (!tmpnew) { |
| 1566 | ret = -ENOMEM; |
| 1567 | goto error; |
| 1568 | } |
| 1569 | strcpy(tmpnew, "LD_LIBRARY_PATH="); |
| 1570 | strcat(tmpnew, consumerd64_libdir); |
| 1571 | if (tmp[0] != '\0') { |
| 1572 | strcat(tmpnew, ":"); |
| 1573 | strcat(tmpnew, tmp); |
| 1574 | } |
| 1575 | ret = putenv(tmpnew); |
| 1576 | if (ret) { |
| 1577 | ret = -errno; |
| 1578 | goto error; |
| 1579 | } |
| 1580 | } |
| 1581 | DBG("Using 64-bit UST consumer at: %s", consumerd64_bin); |
| 1582 | ret = execl(consumerd64_bin, verbosity, "-u", |
| 1583 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
| 1584 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, |
| 1585 | NULL); |
| 1586 | if (consumerd64_libdir[0] != '\0') { |
| 1587 | free(tmpnew); |
| 1588 | } |
| 1589 | if (ret) { |
| 1590 | goto error; |
| 1591 | } |
| 1592 | break; |
| 1593 | } |
| 1594 | case LTTNG_CONSUMER32_UST: |
| 1595 | { |
| 1596 | char *tmpnew = NULL; |
| 1597 | |
| 1598 | if (consumerd32_libdir[0] != '\0') { |
| 1599 | char *tmp; |
| 1600 | size_t tmplen; |
| 1601 | |
| 1602 | tmp = getenv("LD_LIBRARY_PATH"); |
| 1603 | if (!tmp) { |
| 1604 | tmp = ""; |
| 1605 | } |
| 1606 | tmplen = strlen("LD_LIBRARY_PATH=") |
| 1607 | + strlen(consumerd32_libdir) + 1 /* : */ + strlen(tmp); |
| 1608 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
| 1609 | if (!tmpnew) { |
| 1610 | ret = -ENOMEM; |
| 1611 | goto error; |
| 1612 | } |
| 1613 | strcpy(tmpnew, "LD_LIBRARY_PATH="); |
| 1614 | strcat(tmpnew, consumerd32_libdir); |
| 1615 | if (tmp[0] != '\0') { |
| 1616 | strcat(tmpnew, ":"); |
| 1617 | strcat(tmpnew, tmp); |
| 1618 | } |
| 1619 | ret = putenv(tmpnew); |
| 1620 | if (ret) { |
| 1621 | ret = -errno; |
| 1622 | goto error; |
| 1623 | } |
| 1624 | } |
| 1625 | DBG("Using 32-bit UST consumer at: %s", consumerd32_bin); |
| 1626 | ret = execl(consumerd32_bin, verbosity, "-u", |
| 1627 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
| 1628 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, |
| 1629 | NULL); |
| 1630 | if (consumerd32_libdir[0] != '\0') { |
| 1631 | free(tmpnew); |
| 1632 | } |
| 1633 | if (ret) { |
| 1634 | goto error; |
| 1635 | } |
| 1636 | break; |
| 1637 | } |
| 1638 | default: |
| 1639 | perror("unknown consumer type"); |
| 1640 | exit(EXIT_FAILURE); |
| 1641 | } |
| 1642 | if (errno != 0) { |
| 1643 | perror("kernel start consumer exec"); |
| 1644 | } |
| 1645 | exit(EXIT_FAILURE); |
| 1646 | } else if (pid > 0) { |
| 1647 | ret = pid; |
| 1648 | } else { |
| 1649 | perror("start consumer fork"); |
| 1650 | ret = -errno; |
| 1651 | } |
| 1652 | error: |
| 1653 | return ret; |
| 1654 | } |
| 1655 | |
| 1656 | /* |
| 1657 | * Spawn the consumerd daemon and session daemon thread. |
| 1658 | */ |
| 1659 | static int start_consumerd(struct consumer_data *consumer_data) |
| 1660 | { |
| 1661 | int ret; |
| 1662 | |
| 1663 | pthread_mutex_lock(&consumer_data->pid_mutex); |
| 1664 | if (consumer_data->pid != 0) { |
| 1665 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
| 1666 | goto end; |
| 1667 | } |
| 1668 | |
| 1669 | ret = spawn_consumerd(consumer_data); |
| 1670 | if (ret < 0) { |
| 1671 | ERR("Spawning consumerd failed"); |
| 1672 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
| 1673 | goto error; |
| 1674 | } |
| 1675 | |
| 1676 | /* Setting up the consumer_data pid */ |
| 1677 | consumer_data->pid = ret; |
| 1678 | DBG2("Consumer pid %d", consumer_data->pid); |
| 1679 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
| 1680 | |
| 1681 | DBG2("Spawning consumer control thread"); |
| 1682 | ret = spawn_consumer_thread(consumer_data); |
| 1683 | if (ret < 0) { |
| 1684 | ERR("Fatal error spawning consumer control thread"); |
| 1685 | goto error; |
| 1686 | } |
| 1687 | |
| 1688 | end: |
| 1689 | return 0; |
| 1690 | |
| 1691 | error: |
| 1692 | return ret; |
| 1693 | } |
| 1694 | |
| 1695 | /* |
| 1696 | * modprobe_kernel_modules |
| 1697 | */ |
| 1698 | static int modprobe_kernel_modules(void) |
| 1699 | { |
| 1700 | int ret = 0, i; |
| 1701 | char modprobe[256]; |
| 1702 | |
| 1703 | for (i = 0; i < ARRAY_SIZE(kernel_modules_list); i++) { |
| 1704 | ret = snprintf(modprobe, sizeof(modprobe), |
| 1705 | "/sbin/modprobe %s%s", |
| 1706 | kernel_modules_list[i].required ? "" : "-q ", |
| 1707 | kernel_modules_list[i].name); |
| 1708 | if (ret < 0) { |
| 1709 | perror("snprintf modprobe"); |
| 1710 | goto error; |
| 1711 | } |
| 1712 | modprobe[sizeof(modprobe) - 1] = '\0'; |
| 1713 | ret = system(modprobe); |
| 1714 | if (ret == -1) { |
| 1715 | ERR("Unable to launch modprobe for module %s", |
| 1716 | kernel_modules_list[i].name); |
| 1717 | } else if (kernel_modules_list[i].required |
| 1718 | && WEXITSTATUS(ret) != 0) { |
| 1719 | ERR("Unable to load module %s", |
| 1720 | kernel_modules_list[i].name); |
| 1721 | } else { |
| 1722 | DBG("Modprobe successfully %s", |
| 1723 | kernel_modules_list[i].name); |
| 1724 | } |
| 1725 | } |
| 1726 | |
| 1727 | error: |
| 1728 | return ret; |
| 1729 | } |
| 1730 | |
| 1731 | /* |
| 1732 | * mount_debugfs |
| 1733 | */ |
| 1734 | static int mount_debugfs(char *path) |
| 1735 | { |
| 1736 | int ret; |
| 1737 | char *type = "debugfs"; |
| 1738 | |
| 1739 | ret = mkdir_recursive(path, S_IRWXU | S_IRWXG, geteuid(), getegid()); |
| 1740 | if (ret < 0) { |
| 1741 | PERROR("Cannot create debugfs path"); |
| 1742 | goto error; |
| 1743 | } |
| 1744 | |
| 1745 | ret = mount(type, path, type, 0, NULL); |
| 1746 | if (ret < 0) { |
| 1747 | PERROR("Cannot mount debugfs"); |
| 1748 | goto error; |
| 1749 | } |
| 1750 | |
| 1751 | DBG("Mounted debugfs successfully at %s", path); |
| 1752 | |
| 1753 | error: |
| 1754 | return ret; |
| 1755 | } |
| 1756 | |
| 1757 | /* |
| 1758 | * Setup necessary data for kernel tracer action. |
| 1759 | */ |
| 1760 | static void init_kernel_tracer(void) |
| 1761 | { |
| 1762 | int ret; |
| 1763 | char *proc_mounts = "/proc/mounts"; |
| 1764 | char line[256]; |
| 1765 | char *debugfs_path = NULL, *lttng_path = NULL; |
| 1766 | FILE *fp; |
| 1767 | |
| 1768 | /* Detect debugfs */ |
| 1769 | fp = fopen(proc_mounts, "r"); |
| 1770 | if (fp == NULL) { |
| 1771 | ERR("Unable to probe %s", proc_mounts); |
| 1772 | goto error; |
| 1773 | } |
| 1774 | |
| 1775 | while (fgets(line, sizeof(line), fp) != NULL) { |
| 1776 | if (strstr(line, "debugfs") != NULL) { |
| 1777 | /* Remove first string */ |
| 1778 | strtok(line, " "); |
| 1779 | /* Dup string here so we can reuse line later on */ |
| 1780 | debugfs_path = strdup(strtok(NULL, " ")); |
| 1781 | DBG("Got debugfs path : %s", debugfs_path); |
| 1782 | break; |
| 1783 | } |
| 1784 | } |
| 1785 | |
| 1786 | fclose(fp); |
| 1787 | |
| 1788 | /* Mount debugfs if needded */ |
| 1789 | if (debugfs_path == NULL) { |
| 1790 | ret = asprintf(&debugfs_path, "/mnt/debugfs"); |
| 1791 | if (ret < 0) { |
| 1792 | perror("asprintf debugfs path"); |
| 1793 | goto error; |
| 1794 | } |
| 1795 | ret = mount_debugfs(debugfs_path); |
| 1796 | if (ret < 0) { |
| 1797 | perror("Cannot mount debugfs"); |
| 1798 | goto error; |
| 1799 | } |
| 1800 | } |
| 1801 | |
| 1802 | /* Modprobe lttng kernel modules */ |
| 1803 | ret = modprobe_kernel_modules(); |
| 1804 | if (ret < 0) { |
| 1805 | goto error; |
| 1806 | } |
| 1807 | |
| 1808 | /* Setup lttng kernel path */ |
| 1809 | ret = asprintf(<tng_path, "%s/lttng", debugfs_path); |
| 1810 | if (ret < 0) { |
| 1811 | perror("asprintf lttng path"); |
| 1812 | goto error; |
| 1813 | } |
| 1814 | |
| 1815 | /* Open debugfs lttng */ |
| 1816 | kernel_tracer_fd = open(lttng_path, O_RDWR); |
| 1817 | if (kernel_tracer_fd < 0) { |
| 1818 | DBG("Failed to open %s", lttng_path); |
| 1819 | goto error; |
| 1820 | } |
| 1821 | |
| 1822 | free(lttng_path); |
| 1823 | free(debugfs_path); |
| 1824 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
| 1825 | return; |
| 1826 | |
| 1827 | error: |
| 1828 | if (lttng_path) { |
| 1829 | free(lttng_path); |
| 1830 | } |
| 1831 | if (debugfs_path) { |
| 1832 | free(debugfs_path); |
| 1833 | } |
| 1834 | WARN("No kernel tracer available"); |
| 1835 | kernel_tracer_fd = 0; |
| 1836 | return; |
| 1837 | } |
| 1838 | |
| 1839 | /* |
| 1840 | * Init tracing by creating trace directory and sending fds kernel consumer. |
| 1841 | */ |
| 1842 | static int init_kernel_tracing(struct ltt_kernel_session *session) |
| 1843 | { |
| 1844 | int ret = 0; |
| 1845 | |
| 1846 | if (session->consumer_fds_sent == 0) { |
| 1847 | /* |
| 1848 | * Assign default kernel consumer socket if no consumer assigned to the |
| 1849 | * kernel session. At this point, it's NOT suppose to be 0 but this is |
| 1850 | * an extra security check. |
| 1851 | */ |
| 1852 | if (session->consumer_fd == 0) { |
| 1853 | session->consumer_fd = kconsumer_data.cmd_sock; |
| 1854 | } |
| 1855 | |
| 1856 | ret = send_kconsumer_session_streams(&kconsumer_data, session); |
| 1857 | if (ret < 0) { |
| 1858 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
| 1859 | goto error; |
| 1860 | } |
| 1861 | |
| 1862 | session->consumer_fds_sent = 1; |
| 1863 | } |
| 1864 | |
| 1865 | error: |
| 1866 | return ret; |
| 1867 | } |
| 1868 | |
| 1869 | /* |
| 1870 | * Create an UST session and add it to the session ust list. |
| 1871 | */ |
| 1872 | static int create_ust_session(struct ltt_session *session, |
| 1873 | struct lttng_domain *domain) |
| 1874 | { |
| 1875 | int ret; |
| 1876 | unsigned int uid; |
| 1877 | struct ltt_ust_session *lus = NULL; |
| 1878 | |
| 1879 | switch (domain->type) { |
| 1880 | case LTTNG_DOMAIN_UST: |
| 1881 | break; |
| 1882 | default: |
| 1883 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
| 1884 | goto error; |
| 1885 | } |
| 1886 | |
| 1887 | DBG("Creating UST session"); |
| 1888 | |
| 1889 | uid = session->uid; |
| 1890 | lus = trace_ust_create_session(session->path, uid, domain); |
| 1891 | if (lus == NULL) { |
| 1892 | ret = LTTCOMM_UST_SESS_FAIL; |
| 1893 | goto error; |
| 1894 | } |
| 1895 | |
| 1896 | ret = mkdir_recursive(lus->pathname, S_IRWXU | S_IRWXG, |
| 1897 | geteuid(), allowed_group()); |
| 1898 | if (ret < 0) { |
| 1899 | if (ret != -EEXIST) { |
| 1900 | ERR("Trace directory creation error"); |
| 1901 | ret = LTTCOMM_UST_SESS_FAIL; |
| 1902 | goto error; |
| 1903 | } |
| 1904 | } |
| 1905 | |
| 1906 | /* The domain type dictate different actions on session creation */ |
| 1907 | switch (domain->type) { |
| 1908 | case LTTNG_DOMAIN_UST: |
| 1909 | /* No ustctl for the global UST domain */ |
| 1910 | break; |
| 1911 | default: |
| 1912 | ERR("Unknown UST domain on create session %d", domain->type); |
| 1913 | goto error; |
| 1914 | } |
| 1915 | session->ust_session = lus; |
| 1916 | |
| 1917 | return LTTCOMM_OK; |
| 1918 | |
| 1919 | error: |
| 1920 | free(lus); |
| 1921 | return ret; |
| 1922 | } |
| 1923 | |
| 1924 | /* |
| 1925 | * Create a kernel tracer session then create the default channel. |
| 1926 | */ |
| 1927 | static int create_kernel_session(struct ltt_session *session) |
| 1928 | { |
| 1929 | int ret; |
| 1930 | |
| 1931 | DBG("Creating kernel session"); |
| 1932 | |
| 1933 | ret = kernel_create_session(session, kernel_tracer_fd); |
| 1934 | if (ret < 0) { |
| 1935 | ret = LTTCOMM_KERN_SESS_FAIL; |
| 1936 | goto error; |
| 1937 | } |
| 1938 | |
| 1939 | /* Set kernel consumer socket fd */ |
| 1940 | if (kconsumer_data.cmd_sock) { |
| 1941 | session->kernel_session->consumer_fd = kconsumer_data.cmd_sock; |
| 1942 | } |
| 1943 | |
| 1944 | ret = mkdir_recursive(session->kernel_session->trace_path, |
| 1945 | S_IRWXU | S_IRWXG, geteuid(), allowed_group()); |
| 1946 | if (ret < 0) { |
| 1947 | if (ret != -EEXIST) { |
| 1948 | ERR("Trace directory creation error"); |
| 1949 | goto error; |
| 1950 | } |
| 1951 | } |
| 1952 | |
| 1953 | error: |
| 1954 | return ret; |
| 1955 | } |
| 1956 | |
| 1957 | /* |
| 1958 | * Using the session list, filled a lttng_session array to send back to the |
| 1959 | * client for session listing. |
| 1960 | * |
| 1961 | * The session list lock MUST be acquired before calling this function. Use |
| 1962 | * session_lock_list() and session_unlock_list(). |
| 1963 | */ |
| 1964 | static void list_lttng_sessions(struct lttng_session *sessions) |
| 1965 | { |
| 1966 | int i = 0; |
| 1967 | struct ltt_session *session; |
| 1968 | |
| 1969 | DBG("Getting all available session"); |
| 1970 | /* |
| 1971 | * Iterate over session list and append data after the control struct in |
| 1972 | * the buffer. |
| 1973 | */ |
| 1974 | cds_list_for_each_entry(session, &session_list_ptr->head, list) { |
| 1975 | strncpy(sessions[i].path, session->path, PATH_MAX); |
| 1976 | sessions[i].path[PATH_MAX - 1] = '\0'; |
| 1977 | strncpy(sessions[i].name, session->name, NAME_MAX); |
| 1978 | sessions[i].name[NAME_MAX - 1] = '\0'; |
| 1979 | sessions[i].enabled = session->enabled; |
| 1980 | i++; |
| 1981 | } |
| 1982 | } |
| 1983 | |
| 1984 | /* |
| 1985 | * Fill lttng_channel array of all channels. |
| 1986 | */ |
| 1987 | static void list_lttng_channels(int domain, struct ltt_session *session, |
| 1988 | struct lttng_channel *channels) |
| 1989 | { |
| 1990 | int i = 0; |
| 1991 | struct ltt_kernel_channel *kchan; |
| 1992 | |
| 1993 | DBG("Listing channels for session %s", session->name); |
| 1994 | |
| 1995 | switch (domain) { |
| 1996 | case LTTNG_DOMAIN_KERNEL: |
| 1997 | /* Kernel channels */ |
| 1998 | if (session->kernel_session != NULL) { |
| 1999 | cds_list_for_each_entry(kchan, |
| 2000 | &session->kernel_session->channel_list.head, list) { |
| 2001 | /* Copy lttng_channel struct to array */ |
| 2002 | memcpy(&channels[i], kchan->channel, sizeof(struct lttng_channel)); |
| 2003 | channels[i].enabled = kchan->enabled; |
| 2004 | i++; |
| 2005 | } |
| 2006 | } |
| 2007 | break; |
| 2008 | case LTTNG_DOMAIN_UST: |
| 2009 | { |
| 2010 | struct cds_lfht_iter iter; |
| 2011 | struct ltt_ust_channel *uchan; |
| 2012 | |
| 2013 | cds_lfht_for_each_entry(session->ust_session->domain_global.channels, |
| 2014 | &iter, uchan, node) { |
| 2015 | strncpy(channels[i].name, uchan->name, LTTNG_SYMBOL_NAME_LEN); |
| 2016 | channels[i].attr.overwrite = uchan->attr.overwrite; |
| 2017 | channels[i].attr.subbuf_size = uchan->attr.subbuf_size; |
| 2018 | channels[i].attr.num_subbuf = uchan->attr.num_subbuf; |
| 2019 | channels[i].attr.switch_timer_interval = |
| 2020 | uchan->attr.switch_timer_interval; |
| 2021 | channels[i].attr.read_timer_interval = |
| 2022 | uchan->attr.read_timer_interval; |
| 2023 | channels[i].enabled = uchan->enabled; |
| 2024 | switch (uchan->attr.output) { |
| 2025 | case LTTNG_UST_MMAP: |
| 2026 | default: |
| 2027 | channels[i].attr.output = LTTNG_EVENT_MMAP; |
| 2028 | break; |
| 2029 | } |
| 2030 | i++; |
| 2031 | } |
| 2032 | break; |
| 2033 | } |
| 2034 | default: |
| 2035 | break; |
| 2036 | } |
| 2037 | } |
| 2038 | |
| 2039 | /* |
| 2040 | * Create a list of ust global domain events. |
| 2041 | */ |
| 2042 | static int list_lttng_ust_global_events(char *channel_name, |
| 2043 | struct ltt_ust_domain_global *ust_global, struct lttng_event **events) |
| 2044 | { |
| 2045 | int i = 0, ret = 0; |
| 2046 | unsigned int nb_event = 0; |
| 2047 | struct cds_lfht_iter iter; |
| 2048 | struct cds_lfht_node *node; |
| 2049 | struct ltt_ust_channel *uchan; |
| 2050 | struct ltt_ust_event *uevent; |
| 2051 | struct lttng_event *tmp; |
| 2052 | |
| 2053 | DBG("Listing UST global events for channel %s", channel_name); |
| 2054 | |
| 2055 | rcu_read_lock(); |
| 2056 | |
| 2057 | node = hashtable_lookup(ust_global->channels, (void *) channel_name, |
| 2058 | strlen(channel_name), &iter); |
| 2059 | if (node == NULL) { |
| 2060 | ret = -LTTCOMM_UST_CHAN_NOT_FOUND; |
| 2061 | goto error; |
| 2062 | } |
| 2063 | |
| 2064 | uchan = caa_container_of(node, struct ltt_ust_channel, node); |
| 2065 | |
| 2066 | nb_event += hashtable_get_count(uchan->events); |
| 2067 | |
| 2068 | if (nb_event == 0) { |
| 2069 | ret = nb_event; |
| 2070 | goto error; |
| 2071 | } |
| 2072 | |
| 2073 | DBG3("Listing UST global %d events", nb_event); |
| 2074 | |
| 2075 | tmp = zmalloc(nb_event * sizeof(struct lttng_event)); |
| 2076 | if (tmp == NULL) { |
| 2077 | ret = -LTTCOMM_FATAL; |
| 2078 | goto error; |
| 2079 | } |
| 2080 | |
| 2081 | cds_lfht_for_each_entry(uchan->events, &iter, uevent, node) { |
| 2082 | strncpy(tmp[i].name, uevent->attr.name, LTTNG_SYMBOL_NAME_LEN); |
| 2083 | tmp[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
| 2084 | tmp[i].enabled = uevent->enabled; |
| 2085 | switch (uevent->attr.instrumentation) { |
| 2086 | case LTTNG_UST_TRACEPOINT: |
| 2087 | tmp[i].type = LTTNG_EVENT_TRACEPOINT; |
| 2088 | break; |
| 2089 | case LTTNG_UST_PROBE: |
| 2090 | tmp[i].type = LTTNG_EVENT_PROBE; |
| 2091 | break; |
| 2092 | case LTTNG_UST_FUNCTION: |
| 2093 | tmp[i].type = LTTNG_EVENT_FUNCTION; |
| 2094 | break; |
| 2095 | case LTTNG_UST_TRACEPOINT_LOGLEVEL: |
| 2096 | tmp[i].type = LTTNG_EVENT_TRACEPOINT_LOGLEVEL; |
| 2097 | break; |
| 2098 | } |
| 2099 | i++; |
| 2100 | } |
| 2101 | |
| 2102 | ret = nb_event; |
| 2103 | *events = tmp; |
| 2104 | |
| 2105 | error: |
| 2106 | rcu_read_unlock(); |
| 2107 | return ret; |
| 2108 | } |
| 2109 | |
| 2110 | /* |
| 2111 | * Fill lttng_event array of all kernel events in the channel. |
| 2112 | */ |
| 2113 | static int list_lttng_kernel_events(char *channel_name, |
| 2114 | struct ltt_kernel_session *kernel_session, struct lttng_event **events) |
| 2115 | { |
| 2116 | int i = 0, ret; |
| 2117 | unsigned int nb_event; |
| 2118 | struct ltt_kernel_event *event; |
| 2119 | struct ltt_kernel_channel *kchan; |
| 2120 | |
| 2121 | kchan = trace_kernel_get_channel_by_name(channel_name, kernel_session); |
| 2122 | if (kchan == NULL) { |
| 2123 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; |
| 2124 | goto error; |
| 2125 | } |
| 2126 | |
| 2127 | nb_event = kchan->event_count; |
| 2128 | |
| 2129 | DBG("Listing events for channel %s", kchan->channel->name); |
| 2130 | |
| 2131 | if (nb_event == 0) { |
| 2132 | ret = nb_event; |
| 2133 | goto error; |
| 2134 | } |
| 2135 | |
| 2136 | *events = zmalloc(nb_event * sizeof(struct lttng_event)); |
| 2137 | if (*events == NULL) { |
| 2138 | ret = LTTCOMM_FATAL; |
| 2139 | goto error; |
| 2140 | } |
| 2141 | |
| 2142 | /* Kernel channels */ |
| 2143 | cds_list_for_each_entry(event, &kchan->events_list.head , list) { |
| 2144 | strncpy((*events)[i].name, event->event->name, LTTNG_SYMBOL_NAME_LEN); |
| 2145 | (*events)[i].name[LTTNG_SYMBOL_NAME_LEN - 1] = '\0'; |
| 2146 | (*events)[i].enabled = event->enabled; |
| 2147 | switch (event->event->instrumentation) { |
| 2148 | case LTTNG_KERNEL_TRACEPOINT: |
| 2149 | (*events)[i].type = LTTNG_EVENT_TRACEPOINT; |
| 2150 | break; |
| 2151 | case LTTNG_KERNEL_KPROBE: |
| 2152 | case LTTNG_KERNEL_KRETPROBE: |
| 2153 | (*events)[i].type = LTTNG_EVENT_PROBE; |
| 2154 | memcpy(&(*events)[i].attr.probe, &event->event->u.kprobe, |
| 2155 | sizeof(struct lttng_kernel_kprobe)); |
| 2156 | break; |
| 2157 | case LTTNG_KERNEL_FUNCTION: |
| 2158 | (*events)[i].type = LTTNG_EVENT_FUNCTION; |
| 2159 | memcpy(&((*events)[i].attr.ftrace), &event->event->u.ftrace, |
| 2160 | sizeof(struct lttng_kernel_function)); |
| 2161 | break; |
| 2162 | case LTTNG_KERNEL_NOOP: |
| 2163 | (*events)[i].type = LTTNG_EVENT_NOOP; |
| 2164 | break; |
| 2165 | case LTTNG_KERNEL_SYSCALL: |
| 2166 | (*events)[i].type = LTTNG_EVENT_SYSCALL; |
| 2167 | break; |
| 2168 | case LTTNG_KERNEL_ALL: |
| 2169 | assert(0); |
| 2170 | break; |
| 2171 | } |
| 2172 | i++; |
| 2173 | } |
| 2174 | |
| 2175 | return nb_event; |
| 2176 | |
| 2177 | error: |
| 2178 | return ret; |
| 2179 | } |
| 2180 | |
| 2181 | /* |
| 2182 | * Command LTTNG_DISABLE_CHANNEL processed by the client thread. |
| 2183 | */ |
| 2184 | static int cmd_disable_channel(struct ltt_session *session, |
| 2185 | int domain, char *channel_name) |
| 2186 | { |
| 2187 | int ret; |
| 2188 | struct ltt_ust_session *usess; |
| 2189 | |
| 2190 | usess = session->ust_session; |
| 2191 | |
| 2192 | switch (domain) { |
| 2193 | case LTTNG_DOMAIN_KERNEL: |
| 2194 | { |
| 2195 | ret = channel_kernel_disable(session->kernel_session, |
| 2196 | channel_name); |
| 2197 | if (ret != LTTCOMM_OK) { |
| 2198 | goto error; |
| 2199 | } |
| 2200 | |
| 2201 | kernel_wait_quiescent(kernel_tracer_fd); |
| 2202 | break; |
| 2203 | } |
| 2204 | case LTTNG_DOMAIN_UST: |
| 2205 | { |
| 2206 | struct ltt_ust_channel *uchan; |
| 2207 | |
| 2208 | /* Get channel in global UST domain HT */ |
| 2209 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
| 2210 | channel_name); |
| 2211 | if (uchan == NULL) { |
| 2212 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; |
| 2213 | goto error; |
| 2214 | } |
| 2215 | |
| 2216 | /* Already disabled */ |
| 2217 | if (!uchan->enabled) { |
| 2218 | DBG2("UST channel %s already disabled", channel_name); |
| 2219 | break; |
| 2220 | } |
| 2221 | |
| 2222 | ret = ust_app_disable_channel_glb(usess, uchan); |
| 2223 | if (ret < 0) { |
| 2224 | ret = LTTCOMM_UST_DISABLE_FAIL; |
| 2225 | goto error; |
| 2226 | } |
| 2227 | |
| 2228 | uchan->enabled = 0; |
| 2229 | |
| 2230 | break; |
| 2231 | } |
| 2232 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 2233 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 2234 | case LTTNG_DOMAIN_UST_PID: |
| 2235 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2236 | goto error; |
| 2237 | default: |
| 2238 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
| 2239 | goto error; |
| 2240 | } |
| 2241 | |
| 2242 | ret = LTTCOMM_OK; |
| 2243 | |
| 2244 | error: |
| 2245 | return ret; |
| 2246 | } |
| 2247 | |
| 2248 | /* |
| 2249 | * Copy channel from attributes and set it in the application channel list. |
| 2250 | */ |
| 2251 | /* |
| 2252 | static int copy_ust_channel_to_app(struct ltt_ust_session *usess, |
| 2253 | struct lttng_channel *attr, struct ust_app *app) |
| 2254 | { |
| 2255 | int ret; |
| 2256 | struct ltt_ust_channel *uchan, *new_chan; |
| 2257 | |
| 2258 | uchan = trace_ust_get_channel_by_key(usess->channels, attr->name); |
| 2259 | if (uchan == NULL) { |
| 2260 | ret = LTTCOMM_FATAL; |
| 2261 | goto error; |
| 2262 | } |
| 2263 | |
| 2264 | new_chan = trace_ust_create_channel(attr, usess->path); |
| 2265 | if (new_chan == NULL) { |
| 2266 | PERROR("malloc ltt_ust_channel"); |
| 2267 | ret = LTTCOMM_FATAL; |
| 2268 | goto error; |
| 2269 | } |
| 2270 | |
| 2271 | ret = channel_ust_copy(new_chan, uchan); |
| 2272 | if (ret < 0) { |
| 2273 | ret = LTTCOMM_FATAL; |
| 2274 | goto error; |
| 2275 | } |
| 2276 | |
| 2277 | error: |
| 2278 | return ret; |
| 2279 | } |
| 2280 | */ |
| 2281 | |
| 2282 | /* |
| 2283 | * Command LTTNG_ENABLE_CHANNEL processed by the client thread. |
| 2284 | */ |
| 2285 | static int cmd_enable_channel(struct ltt_session *session, |
| 2286 | int domain, struct lttng_channel *attr) |
| 2287 | { |
| 2288 | int ret; |
| 2289 | struct ltt_ust_session *usess = session->ust_session; |
| 2290 | |
| 2291 | DBG("Enabling channel %s for session %s", attr->name, session->name); |
| 2292 | |
| 2293 | switch (domain) { |
| 2294 | case LTTNG_DOMAIN_KERNEL: |
| 2295 | { |
| 2296 | struct ltt_kernel_channel *kchan; |
| 2297 | |
| 2298 | kchan = trace_kernel_get_channel_by_name(attr->name, |
| 2299 | session->kernel_session); |
| 2300 | if (kchan == NULL) { |
| 2301 | ret = channel_kernel_create(session->kernel_session, |
| 2302 | attr, kernel_poll_pipe[1]); |
| 2303 | } else { |
| 2304 | ret = channel_kernel_enable(session->kernel_session, kchan); |
| 2305 | } |
| 2306 | |
| 2307 | if (ret != LTTCOMM_OK) { |
| 2308 | goto error; |
| 2309 | } |
| 2310 | |
| 2311 | kernel_wait_quiescent(kernel_tracer_fd); |
| 2312 | break; |
| 2313 | } |
| 2314 | case LTTNG_DOMAIN_UST: |
| 2315 | { |
| 2316 | struct ltt_ust_channel *uchan; |
| 2317 | |
| 2318 | DBG2("Enabling channel for LTTNG_DOMAIN_UST"); |
| 2319 | |
| 2320 | /* Get channel in global UST domain HT */ |
| 2321 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
| 2322 | attr->name); |
| 2323 | if (uchan == NULL) { |
| 2324 | uchan = trace_ust_create_channel(attr, usess->pathname); |
| 2325 | if (uchan == NULL) { |
| 2326 | ret = LTTCOMM_UST_CHAN_FAIL; |
| 2327 | goto error; |
| 2328 | } |
| 2329 | |
| 2330 | /* Add channel to all registered applications */ |
| 2331 | ret = ust_app_create_channel_glb(usess, uchan); |
| 2332 | if (ret != 0) { |
| 2333 | ret = LTTCOMM_UST_CHAN_FAIL; |
| 2334 | goto error; |
| 2335 | } |
| 2336 | |
| 2337 | rcu_read_lock(); |
| 2338 | hashtable_add_unique(usess->domain_global.channels, &uchan->node); |
| 2339 | rcu_read_unlock(); |
| 2340 | |
| 2341 | DBG2("UST channel %s added to global domain HT", attr->name); |
| 2342 | } else { |
| 2343 | /* If already enabled, everything is OK */ |
| 2344 | if (uchan->enabled) { |
| 2345 | break; |
| 2346 | } |
| 2347 | |
| 2348 | ret = ust_app_enable_channel_glb(usess, uchan); |
| 2349 | if (ret < 0) { |
| 2350 | if (ret != -EEXIST) { |
| 2351 | ret = LTTCOMM_UST_CHAN_ENABLE_FAIL; |
| 2352 | goto error; |
| 2353 | } else { |
| 2354 | ret = LTTCOMM_OK; |
| 2355 | } |
| 2356 | } |
| 2357 | } |
| 2358 | |
| 2359 | uchan->enabled = 1; |
| 2360 | |
| 2361 | break; |
| 2362 | } |
| 2363 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 2364 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 2365 | case LTTNG_DOMAIN_UST_PID: |
| 2366 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2367 | goto error; |
| 2368 | default: |
| 2369 | ret = LTTCOMM_UNKNOWN_DOMAIN; |
| 2370 | goto error; |
| 2371 | } |
| 2372 | |
| 2373 | ret = LTTCOMM_OK; |
| 2374 | |
| 2375 | error: |
| 2376 | return ret; |
| 2377 | } |
| 2378 | |
| 2379 | /* |
| 2380 | * Command LTTNG_DISABLE_EVENT processed by the client thread. |
| 2381 | */ |
| 2382 | static int cmd_disable_event(struct ltt_session *session, int domain, |
| 2383 | char *channel_name, char *event_name) |
| 2384 | { |
| 2385 | int ret; |
| 2386 | |
| 2387 | switch (domain) { |
| 2388 | case LTTNG_DOMAIN_KERNEL: |
| 2389 | { |
| 2390 | struct ltt_kernel_channel *kchan; |
| 2391 | struct ltt_kernel_session *ksess; |
| 2392 | |
| 2393 | ksess = session->kernel_session; |
| 2394 | |
| 2395 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
| 2396 | if (kchan == NULL) { |
| 2397 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; |
| 2398 | goto error; |
| 2399 | } |
| 2400 | |
| 2401 | ret = event_kernel_disable_tracepoint(ksess, kchan, event_name); |
| 2402 | if (ret != LTTCOMM_OK) { |
| 2403 | goto error; |
| 2404 | } |
| 2405 | |
| 2406 | kernel_wait_quiescent(kernel_tracer_fd); |
| 2407 | break; |
| 2408 | } |
| 2409 | case LTTNG_DOMAIN_UST: |
| 2410 | { |
| 2411 | struct ltt_ust_session *usess; |
| 2412 | struct ltt_ust_channel *uchan; |
| 2413 | struct ltt_ust_event *uevent; |
| 2414 | |
| 2415 | usess = session->ust_session; |
| 2416 | |
| 2417 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
| 2418 | channel_name); |
| 2419 | if (uchan == NULL) { |
| 2420 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; |
| 2421 | goto error; |
| 2422 | } |
| 2423 | |
| 2424 | uevent = trace_ust_find_event_by_name(uchan->events, event_name); |
| 2425 | if (uevent == NULL) { |
| 2426 | ret = LTTCOMM_UST_EVENT_NOT_FOUND; |
| 2427 | goto error; |
| 2428 | } |
| 2429 | |
| 2430 | ret = ust_app_disable_event_glb(usess, uchan, uevent); |
| 2431 | if (ret < 0) { |
| 2432 | ret = LTTCOMM_UST_DISABLE_FAIL; |
| 2433 | goto error; |
| 2434 | } |
| 2435 | |
| 2436 | uevent->enabled = 0; |
| 2437 | |
| 2438 | DBG2("Disable UST event %s in channel %s completed", event_name, |
| 2439 | channel_name); |
| 2440 | |
| 2441 | break; |
| 2442 | } |
| 2443 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 2444 | case LTTNG_DOMAIN_UST_PID: |
| 2445 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 2446 | default: |
| 2447 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2448 | goto error; |
| 2449 | } |
| 2450 | |
| 2451 | ret = LTTCOMM_OK; |
| 2452 | |
| 2453 | error: |
| 2454 | return ret; |
| 2455 | } |
| 2456 | |
| 2457 | /* |
| 2458 | * Command LTTNG_DISABLE_ALL_EVENT processed by the client thread. |
| 2459 | */ |
| 2460 | static int cmd_disable_event_all(struct ltt_session *session, int domain, |
| 2461 | char *channel_name) |
| 2462 | { |
| 2463 | int ret; |
| 2464 | |
| 2465 | switch (domain) { |
| 2466 | case LTTNG_DOMAIN_KERNEL: |
| 2467 | { |
| 2468 | struct ltt_kernel_session *ksess; |
| 2469 | struct ltt_kernel_channel *kchan; |
| 2470 | |
| 2471 | ksess = session->kernel_session; |
| 2472 | |
| 2473 | kchan = trace_kernel_get_channel_by_name(channel_name, ksess); |
| 2474 | if (kchan == NULL) { |
| 2475 | ret = LTTCOMM_KERN_CHAN_NOT_FOUND; |
| 2476 | goto error; |
| 2477 | } |
| 2478 | |
| 2479 | ret = event_kernel_disable_all(ksess, kchan); |
| 2480 | if (ret != LTTCOMM_OK) { |
| 2481 | goto error; |
| 2482 | } |
| 2483 | |
| 2484 | kernel_wait_quiescent(kernel_tracer_fd); |
| 2485 | break; |
| 2486 | } |
| 2487 | case LTTNG_DOMAIN_UST: |
| 2488 | { |
| 2489 | struct ltt_ust_session *usess; |
| 2490 | struct ltt_ust_channel *uchan; |
| 2491 | |
| 2492 | usess = session->ust_session; |
| 2493 | |
| 2494 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
| 2495 | channel_name); |
| 2496 | if (uchan == NULL) { |
| 2497 | ret = LTTCOMM_UST_CHAN_NOT_FOUND; |
| 2498 | goto error; |
| 2499 | } |
| 2500 | |
| 2501 | ret = ust_app_disable_all_event_glb(usess, uchan); |
| 2502 | if (ret < 0) { |
| 2503 | ret = LTTCOMM_UST_DISABLE_FAIL; |
| 2504 | goto error; |
| 2505 | } |
| 2506 | |
| 2507 | DBG2("Disable all UST event in channel %s completed", channel_name); |
| 2508 | |
| 2509 | break; |
| 2510 | } |
| 2511 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 2512 | case LTTNG_DOMAIN_UST_PID: |
| 2513 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 2514 | default: |
| 2515 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2516 | goto error; |
| 2517 | } |
| 2518 | |
| 2519 | ret = LTTCOMM_OK; |
| 2520 | |
| 2521 | error: |
| 2522 | return ret; |
| 2523 | } |
| 2524 | |
| 2525 | /* |
| 2526 | * Command LTTNG_ADD_CONTEXT processed by the client thread. |
| 2527 | */ |
| 2528 | static int cmd_add_context(struct ltt_session *session, int domain, |
| 2529 | char *channel_name, char *event_name, struct lttng_event_context *ctx) |
| 2530 | { |
| 2531 | int ret; |
| 2532 | |
| 2533 | switch (domain) { |
| 2534 | case LTTNG_DOMAIN_KERNEL: |
| 2535 | /* Add kernel context to kernel tracer */ |
| 2536 | ret = context_kernel_add(session->kernel_session, ctx, |
| 2537 | event_name, channel_name); |
| 2538 | if (ret != LTTCOMM_OK) { |
| 2539 | goto error; |
| 2540 | } |
| 2541 | break; |
| 2542 | case LTTNG_DOMAIN_UST: |
| 2543 | { |
| 2544 | struct ltt_ust_session *usess = session->ust_session; |
| 2545 | |
| 2546 | ret = context_ust_add(usess, domain, ctx, event_name, channel_name); |
| 2547 | if (ret != LTTCOMM_OK) { |
| 2548 | goto error; |
| 2549 | } |
| 2550 | break; |
| 2551 | } |
| 2552 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 2553 | case LTTNG_DOMAIN_UST_PID: |
| 2554 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 2555 | default: |
| 2556 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2557 | goto error; |
| 2558 | } |
| 2559 | |
| 2560 | ret = LTTCOMM_OK; |
| 2561 | |
| 2562 | error: |
| 2563 | return ret; |
| 2564 | } |
| 2565 | |
| 2566 | /* |
| 2567 | * Command LTTNG_ENABLE_EVENT processed by the client thread. |
| 2568 | * |
| 2569 | * TODO: currently, both events and loglevels are kept within the same |
| 2570 | * namespace for UST global registry/app registery, so if an event |
| 2571 | * happen to have the same name as the loglevel (very unlikely though), |
| 2572 | * and an attempt is made to enable/disable both in the same session, |
| 2573 | * the first to be created will be the only one allowed to exist. |
| 2574 | */ |
| 2575 | static int cmd_enable_event(struct ltt_session *session, int domain, |
| 2576 | char *channel_name, struct lttng_event *event) |
| 2577 | { |
| 2578 | int ret; |
| 2579 | struct lttng_channel *attr; |
| 2580 | struct ltt_ust_session *usess = session->ust_session; |
| 2581 | |
| 2582 | switch (domain) { |
| 2583 | case LTTNG_DOMAIN_KERNEL: |
| 2584 | { |
| 2585 | struct ltt_kernel_channel *kchan; |
| 2586 | |
| 2587 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 2588 | session->kernel_session); |
| 2589 | if (kchan == NULL) { |
| 2590 | attr = channel_new_default_attr(domain); |
| 2591 | if (attr == NULL) { |
| 2592 | ret = LTTCOMM_FATAL; |
| 2593 | goto error; |
| 2594 | } |
| 2595 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
| 2596 | |
| 2597 | /* This call will notify the kernel thread */ |
| 2598 | ret = channel_kernel_create(session->kernel_session, |
| 2599 | attr, kernel_poll_pipe[1]); |
| 2600 | if (ret != LTTCOMM_OK) { |
| 2601 | free(attr); |
| 2602 | goto error; |
| 2603 | } |
| 2604 | free(attr); |
| 2605 | } |
| 2606 | |
| 2607 | /* Get the newly created kernel channel pointer */ |
| 2608 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 2609 | session->kernel_session); |
| 2610 | if (kchan == NULL) { |
| 2611 | /* This sould not happen... */ |
| 2612 | ret = LTTCOMM_FATAL; |
| 2613 | goto error; |
| 2614 | } |
| 2615 | |
| 2616 | ret = event_kernel_enable_tracepoint(session->kernel_session, kchan, |
| 2617 | event); |
| 2618 | if (ret != LTTCOMM_OK) { |
| 2619 | goto error; |
| 2620 | } |
| 2621 | |
| 2622 | kernel_wait_quiescent(kernel_tracer_fd); |
| 2623 | break; |
| 2624 | } |
| 2625 | case LTTNG_DOMAIN_UST: |
| 2626 | { |
| 2627 | struct lttng_channel *attr; |
| 2628 | struct ltt_ust_channel *uchan; |
| 2629 | |
| 2630 | /* Get channel from global UST domain */ |
| 2631 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
| 2632 | channel_name); |
| 2633 | if (uchan == NULL) { |
| 2634 | /* Create default channel */ |
| 2635 | attr = channel_new_default_attr(domain); |
| 2636 | if (attr == NULL) { |
| 2637 | ret = LTTCOMM_FATAL; |
| 2638 | goto error; |
| 2639 | } |
| 2640 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
| 2641 | attr->name[NAME_MAX - 1] = '\0'; |
| 2642 | |
| 2643 | /* Use the internal command enable channel */ |
| 2644 | ret = cmd_enable_channel(session, domain, attr); |
| 2645 | if (ret != LTTCOMM_OK) { |
| 2646 | free(attr); |
| 2647 | goto error; |
| 2648 | } |
| 2649 | free(attr); |
| 2650 | |
| 2651 | /* Get the newly created channel reference back */ |
| 2652 | uchan = trace_ust_find_channel_by_name( |
| 2653 | usess->domain_global.channels, channel_name); |
| 2654 | if (uchan == NULL) { |
| 2655 | /* Something is really wrong */ |
| 2656 | ret = LTTCOMM_FATAL; |
| 2657 | goto error; |
| 2658 | } |
| 2659 | } |
| 2660 | |
| 2661 | /* At this point, the session and channel exist on the tracer */ |
| 2662 | |
| 2663 | ret = event_ust_enable_tracepoint(usess, domain, uchan, event); |
| 2664 | if (ret != LTTCOMM_OK) { |
| 2665 | goto error; |
| 2666 | } |
| 2667 | break; |
| 2668 | } |
| 2669 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 2670 | case LTTNG_DOMAIN_UST_PID: |
| 2671 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 2672 | default: |
| 2673 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2674 | goto error; |
| 2675 | } |
| 2676 | |
| 2677 | ret = LTTCOMM_OK; |
| 2678 | |
| 2679 | error: |
| 2680 | return ret; |
| 2681 | } |
| 2682 | |
| 2683 | /* |
| 2684 | * Command LTTNG_ENABLE_ALL_EVENT processed by the client thread. |
| 2685 | */ |
| 2686 | static int cmd_enable_event_all(struct ltt_session *session, int domain, |
| 2687 | char *channel_name, int event_type) |
| 2688 | { |
| 2689 | int ret; |
| 2690 | struct ltt_kernel_channel *kchan; |
| 2691 | |
| 2692 | switch (domain) { |
| 2693 | case LTTNG_DOMAIN_KERNEL: |
| 2694 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 2695 | session->kernel_session); |
| 2696 | if (kchan == NULL) { |
| 2697 | /* This call will notify the kernel thread */ |
| 2698 | ret = channel_kernel_create(session->kernel_session, NULL, |
| 2699 | kernel_poll_pipe[1]); |
| 2700 | if (ret != LTTCOMM_OK) { |
| 2701 | goto error; |
| 2702 | } |
| 2703 | |
| 2704 | /* Get the newly created kernel channel pointer */ |
| 2705 | kchan = trace_kernel_get_channel_by_name(channel_name, |
| 2706 | session->kernel_session); |
| 2707 | if (kchan == NULL) { |
| 2708 | /* This sould not happen... */ |
| 2709 | ret = LTTCOMM_FATAL; |
| 2710 | goto error; |
| 2711 | } |
| 2712 | |
| 2713 | } |
| 2714 | |
| 2715 | switch (event_type) { |
| 2716 | case LTTNG_EVENT_SYSCALL: |
| 2717 | ret = event_kernel_enable_all_syscalls(session->kernel_session, |
| 2718 | kchan, kernel_tracer_fd); |
| 2719 | break; |
| 2720 | case LTTNG_EVENT_TRACEPOINT: |
| 2721 | /* |
| 2722 | * This call enables all LTTNG_KERNEL_TRACEPOINTS and |
| 2723 | * events already registered to the channel. |
| 2724 | */ |
| 2725 | ret = event_kernel_enable_all_tracepoints(session->kernel_session, |
| 2726 | kchan, kernel_tracer_fd); |
| 2727 | break; |
| 2728 | case LTTNG_EVENT_ALL: |
| 2729 | /* Enable syscalls and tracepoints */ |
| 2730 | ret = event_kernel_enable_all(session->kernel_session, |
| 2731 | kchan, kernel_tracer_fd); |
| 2732 | break; |
| 2733 | default: |
| 2734 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
| 2735 | goto error; |
| 2736 | } |
| 2737 | |
| 2738 | /* Manage return value */ |
| 2739 | if (ret != LTTCOMM_OK) { |
| 2740 | goto error; |
| 2741 | } |
| 2742 | |
| 2743 | kernel_wait_quiescent(kernel_tracer_fd); |
| 2744 | break; |
| 2745 | case LTTNG_DOMAIN_UST: |
| 2746 | { |
| 2747 | struct lttng_channel *attr; |
| 2748 | struct ltt_ust_channel *uchan; |
| 2749 | struct ltt_ust_session *usess = session->ust_session; |
| 2750 | |
| 2751 | /* Get channel from global UST domain */ |
| 2752 | uchan = trace_ust_find_channel_by_name(usess->domain_global.channels, |
| 2753 | channel_name); |
| 2754 | if (uchan == NULL) { |
| 2755 | /* Create default channel */ |
| 2756 | attr = channel_new_default_attr(domain); |
| 2757 | if (attr == NULL) { |
| 2758 | ret = LTTCOMM_FATAL; |
| 2759 | goto error; |
| 2760 | } |
| 2761 | snprintf(attr->name, NAME_MAX, "%s", channel_name); |
| 2762 | attr->name[NAME_MAX - 1] = '\0'; |
| 2763 | |
| 2764 | /* Use the internal command enable channel */ |
| 2765 | ret = cmd_enable_channel(session, domain, attr); |
| 2766 | if (ret != LTTCOMM_OK) { |
| 2767 | free(attr); |
| 2768 | goto error; |
| 2769 | } |
| 2770 | free(attr); |
| 2771 | |
| 2772 | /* Get the newly created channel reference back */ |
| 2773 | uchan = trace_ust_find_channel_by_name( |
| 2774 | usess->domain_global.channels, channel_name); |
| 2775 | if (uchan == NULL) { |
| 2776 | /* Something is really wrong */ |
| 2777 | ret = LTTCOMM_FATAL; |
| 2778 | goto error; |
| 2779 | } |
| 2780 | } |
| 2781 | |
| 2782 | /* At this point, the session and channel exist on the tracer */ |
| 2783 | |
| 2784 | switch (event_type) { |
| 2785 | case LTTNG_EVENT_ALL: |
| 2786 | case LTTNG_EVENT_TRACEPOINT: |
| 2787 | ret = event_ust_enable_all_tracepoints(usess, domain, uchan); |
| 2788 | if (ret != LTTCOMM_OK) { |
| 2789 | goto error; |
| 2790 | } |
| 2791 | break; |
| 2792 | default: |
| 2793 | ret = LTTCOMM_UST_ENABLE_FAIL; |
| 2794 | goto error; |
| 2795 | } |
| 2796 | |
| 2797 | /* Manage return value */ |
| 2798 | if (ret != LTTCOMM_OK) { |
| 2799 | goto error; |
| 2800 | } |
| 2801 | |
| 2802 | break; |
| 2803 | } |
| 2804 | case LTTNG_DOMAIN_UST_EXEC_NAME: |
| 2805 | case LTTNG_DOMAIN_UST_PID: |
| 2806 | case LTTNG_DOMAIN_UST_PID_FOLLOW_CHILDREN: |
| 2807 | default: |
| 2808 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2809 | goto error; |
| 2810 | } |
| 2811 | |
| 2812 | ret = LTTCOMM_OK; |
| 2813 | |
| 2814 | error: |
| 2815 | return ret; |
| 2816 | } |
| 2817 | |
| 2818 | /* |
| 2819 | * Command LTTNG_LIST_TRACEPOINTS processed by the client thread. |
| 2820 | */ |
| 2821 | static ssize_t cmd_list_tracepoints(int domain, struct lttng_event **events) |
| 2822 | { |
| 2823 | int ret; |
| 2824 | ssize_t nb_events = 0; |
| 2825 | |
| 2826 | switch (domain) { |
| 2827 | case LTTNG_DOMAIN_KERNEL: |
| 2828 | nb_events = kernel_list_events(kernel_tracer_fd, events); |
| 2829 | if (nb_events < 0) { |
| 2830 | ret = LTTCOMM_KERN_LIST_FAIL; |
| 2831 | goto error; |
| 2832 | } |
| 2833 | break; |
| 2834 | case LTTNG_DOMAIN_UST: |
| 2835 | nb_events = ust_app_list_events(events); |
| 2836 | if (nb_events < 0) { |
| 2837 | ret = LTTCOMM_UST_LIST_FAIL; |
| 2838 | goto error; |
| 2839 | } |
| 2840 | break; |
| 2841 | default: |
| 2842 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 2843 | goto error; |
| 2844 | } |
| 2845 | |
| 2846 | return nb_events; |
| 2847 | |
| 2848 | error: |
| 2849 | /* Return negative value to differentiate return code */ |
| 2850 | return -ret; |
| 2851 | } |
| 2852 | |
| 2853 | /* |
| 2854 | * Command LTTNG_START_TRACE processed by the client thread. |
| 2855 | */ |
| 2856 | static int cmd_start_trace(struct ltt_session *session) |
| 2857 | { |
| 2858 | int ret; |
| 2859 | struct ltt_kernel_session *ksession; |
| 2860 | struct ltt_ust_session *usess; |
| 2861 | |
| 2862 | /* Short cut */ |
| 2863 | ksession = session->kernel_session; |
| 2864 | usess = session->ust_session; |
| 2865 | |
| 2866 | if (session->enabled) |
| 2867 | return LTTCOMM_UST_START_FAIL; |
| 2868 | session->enabled = 1; |
| 2869 | |
| 2870 | /* Kernel tracing */ |
| 2871 | if (ksession != NULL) { |
| 2872 | struct ltt_kernel_channel *kchan; |
| 2873 | |
| 2874 | /* Open kernel metadata */ |
| 2875 | if (ksession->metadata == NULL) { |
| 2876 | ret = kernel_open_metadata(ksession, ksession->trace_path); |
| 2877 | if (ret < 0) { |
| 2878 | ret = LTTCOMM_KERN_META_FAIL; |
| 2879 | goto error; |
| 2880 | } |
| 2881 | } |
| 2882 | |
| 2883 | /* Open kernel metadata stream */ |
| 2884 | if (ksession->metadata_stream_fd == 0) { |
| 2885 | ret = kernel_open_metadata_stream(ksession); |
| 2886 | if (ret < 0) { |
| 2887 | ERR("Kernel create metadata stream failed"); |
| 2888 | ret = LTTCOMM_KERN_STREAM_FAIL; |
| 2889 | goto error; |
| 2890 | } |
| 2891 | } |
| 2892 | |
| 2893 | /* For each channel */ |
| 2894 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
| 2895 | if (kchan->stream_count == 0) { |
| 2896 | ret = kernel_open_channel_stream(kchan); |
| 2897 | if (ret < 0) { |
| 2898 | ret = LTTCOMM_KERN_STREAM_FAIL; |
| 2899 | goto error; |
| 2900 | } |
| 2901 | /* Update the stream global counter */ |
| 2902 | ksession->stream_count_global += ret; |
| 2903 | } |
| 2904 | } |
| 2905 | |
| 2906 | /* Setup kernel consumer socket and send fds to it */ |
| 2907 | ret = init_kernel_tracing(ksession); |
| 2908 | if (ret < 0) { |
| 2909 | ret = LTTCOMM_KERN_START_FAIL; |
| 2910 | goto error; |
| 2911 | } |
| 2912 | |
| 2913 | /* This start the kernel tracing */ |
| 2914 | ret = kernel_start_session(ksession); |
| 2915 | if (ret < 0) { |
| 2916 | ret = LTTCOMM_KERN_START_FAIL; |
| 2917 | goto error; |
| 2918 | } |
| 2919 | |
| 2920 | /* Quiescent wait after starting trace */ |
| 2921 | kernel_wait_quiescent(kernel_tracer_fd); |
| 2922 | } |
| 2923 | |
| 2924 | /* Flag session that trace should start automatically */ |
| 2925 | if (usess) { |
| 2926 | usess->start_trace = 1; |
| 2927 | |
| 2928 | ret = ust_app_start_trace_all(usess); |
| 2929 | if (ret < 0) { |
| 2930 | ret = LTTCOMM_UST_START_FAIL; |
| 2931 | goto error; |
| 2932 | } |
| 2933 | } |
| 2934 | |
| 2935 | ret = LTTCOMM_OK; |
| 2936 | |
| 2937 | error: |
| 2938 | return ret; |
| 2939 | } |
| 2940 | |
| 2941 | /* |
| 2942 | * Command LTTNG_STOP_TRACE processed by the client thread. |
| 2943 | */ |
| 2944 | static int cmd_stop_trace(struct ltt_session *session) |
| 2945 | { |
| 2946 | int ret; |
| 2947 | struct ltt_kernel_channel *kchan; |
| 2948 | struct ltt_kernel_session *ksession; |
| 2949 | struct ltt_ust_session *usess; |
| 2950 | |
| 2951 | /* Short cut */ |
| 2952 | ksession = session->kernel_session; |
| 2953 | usess = session->ust_session; |
| 2954 | |
| 2955 | if (!session->enabled) |
| 2956 | return LTTCOMM_UST_START_FAIL; |
| 2957 | session->enabled = 0; |
| 2958 | |
| 2959 | /* Kernel tracer */ |
| 2960 | if (ksession != NULL) { |
| 2961 | DBG("Stop kernel tracing"); |
| 2962 | |
| 2963 | /* Flush all buffers before stopping */ |
| 2964 | ret = kernel_metadata_flush_buffer(ksession->metadata_stream_fd); |
| 2965 | if (ret < 0) { |
| 2966 | ERR("Kernel metadata flush failed"); |
| 2967 | } |
| 2968 | |
| 2969 | cds_list_for_each_entry(kchan, &ksession->channel_list.head, list) { |
| 2970 | ret = kernel_flush_buffer(kchan); |
| 2971 | if (ret < 0) { |
| 2972 | ERR("Kernel flush buffer error"); |
| 2973 | } |
| 2974 | } |
| 2975 | |
| 2976 | ret = kernel_stop_session(ksession); |
| 2977 | if (ret < 0) { |
| 2978 | ret = LTTCOMM_KERN_STOP_FAIL; |
| 2979 | goto error; |
| 2980 | } |
| 2981 | |
| 2982 | kernel_wait_quiescent(kernel_tracer_fd); |
| 2983 | } |
| 2984 | |
| 2985 | if (usess) { |
| 2986 | usess->start_trace = 0; |
| 2987 | |
| 2988 | ret = ust_app_stop_trace_all(usess); |
| 2989 | if (ret < 0) { |
| 2990 | ret = LTTCOMM_UST_START_FAIL; |
| 2991 | goto error; |
| 2992 | } |
| 2993 | } |
| 2994 | |
| 2995 | ret = LTTCOMM_OK; |
| 2996 | |
| 2997 | error: |
| 2998 | return ret; |
| 2999 | } |
| 3000 | |
| 3001 | /* |
| 3002 | * Command LTTNG_CREATE_SESSION processed by the client thread. |
| 3003 | */ |
| 3004 | static int cmd_create_session(char *name, char *path) |
| 3005 | { |
| 3006 | int ret; |
| 3007 | |
| 3008 | ret = session_create(name, path); |
| 3009 | if (ret != LTTCOMM_OK) { |
| 3010 | goto error; |
| 3011 | } |
| 3012 | |
| 3013 | ret = LTTCOMM_OK; |
| 3014 | |
| 3015 | error: |
| 3016 | return ret; |
| 3017 | } |
| 3018 | |
| 3019 | /* |
| 3020 | * Command LTTNG_DESTROY_SESSION processed by the client thread. |
| 3021 | */ |
| 3022 | static int cmd_destroy_session(struct ltt_session *session, char *name) |
| 3023 | { |
| 3024 | int ret; |
| 3025 | |
| 3026 | /* Clean kernel session teardown */ |
| 3027 | teardown_kernel_session(session); |
| 3028 | /* UST session teardown */ |
| 3029 | teardown_ust_session(session); |
| 3030 | |
| 3031 | /* |
| 3032 | * Must notify the kernel thread here to update it's poll setin order |
| 3033 | * to remove the channel(s)' fd just destroyed. |
| 3034 | */ |
| 3035 | ret = notify_thread_pipe(kernel_poll_pipe[1]); |
| 3036 | if (ret < 0) { |
| 3037 | perror("write kernel poll pipe"); |
| 3038 | } |
| 3039 | |
| 3040 | ret = session_destroy(session); |
| 3041 | |
| 3042 | return ret; |
| 3043 | } |
| 3044 | |
| 3045 | /* |
| 3046 | * Command LTTNG_CALIBRATE processed by the client thread. |
| 3047 | */ |
| 3048 | static int cmd_calibrate(int domain, struct lttng_calibrate *calibrate) |
| 3049 | { |
| 3050 | int ret; |
| 3051 | |
| 3052 | switch (domain) { |
| 3053 | case LTTNG_DOMAIN_KERNEL: |
| 3054 | { |
| 3055 | struct lttng_kernel_calibrate kcalibrate; |
| 3056 | |
| 3057 | kcalibrate.type = calibrate->type; |
| 3058 | ret = kernel_calibrate(kernel_tracer_fd, &kcalibrate); |
| 3059 | if (ret < 0) { |
| 3060 | ret = LTTCOMM_KERN_ENABLE_FAIL; |
| 3061 | goto error; |
| 3062 | } |
| 3063 | break; |
| 3064 | } |
| 3065 | default: |
| 3066 | /* TODO: Userspace tracing */ |
| 3067 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 3068 | goto error; |
| 3069 | } |
| 3070 | |
| 3071 | ret = LTTCOMM_OK; |
| 3072 | |
| 3073 | error: |
| 3074 | return ret; |
| 3075 | } |
| 3076 | |
| 3077 | /* |
| 3078 | * Command LTTNG_REGISTER_CONSUMER processed by the client thread. |
| 3079 | */ |
| 3080 | static int cmd_register_consumer(struct ltt_session *session, int domain, |
| 3081 | char *sock_path) |
| 3082 | { |
| 3083 | int ret, sock; |
| 3084 | |
| 3085 | switch (domain) { |
| 3086 | case LTTNG_DOMAIN_KERNEL: |
| 3087 | /* Can't register a consumer if there is already one */ |
| 3088 | if (session->kernel_session->consumer_fd != 0) { |
| 3089 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
| 3090 | goto error; |
| 3091 | } |
| 3092 | |
| 3093 | sock = lttcomm_connect_unix_sock(sock_path); |
| 3094 | if (sock < 0) { |
| 3095 | ret = LTTCOMM_CONNECT_FAIL; |
| 3096 | goto error; |
| 3097 | } |
| 3098 | |
| 3099 | session->kernel_session->consumer_fd = sock; |
| 3100 | break; |
| 3101 | default: |
| 3102 | /* TODO: Userspace tracing */ |
| 3103 | ret = LTTCOMM_NOT_IMPLEMENTED; |
| 3104 | goto error; |
| 3105 | } |
| 3106 | |
| 3107 | ret = LTTCOMM_OK; |
| 3108 | |
| 3109 | error: |
| 3110 | return ret; |
| 3111 | } |
| 3112 | |
| 3113 | /* |
| 3114 | * Command LTTNG_LIST_DOMAINS processed by the client thread. |
| 3115 | */ |
| 3116 | static ssize_t cmd_list_domains(struct ltt_session *session, |
| 3117 | struct lttng_domain **domains) |
| 3118 | { |
| 3119 | int ret, index = 0; |
| 3120 | ssize_t nb_dom = 0; |
| 3121 | |
| 3122 | if (session->kernel_session != NULL) { |
| 3123 | DBG3("Listing domains found kernel domain"); |
| 3124 | nb_dom++; |
| 3125 | } |
| 3126 | |
| 3127 | if (session->ust_session != NULL) { |
| 3128 | DBG3("Listing domains found UST global domain"); |
| 3129 | nb_dom++; |
| 3130 | } |
| 3131 | |
| 3132 | *domains = zmalloc(nb_dom * sizeof(struct lttng_domain)); |
| 3133 | if (*domains == NULL) { |
| 3134 | ret = -LTTCOMM_FATAL; |
| 3135 | goto error; |
| 3136 | } |
| 3137 | |
| 3138 | if (session->kernel_session != NULL) { |
| 3139 | (*domains)[index].type = LTTNG_DOMAIN_KERNEL; |
| 3140 | index++; |
| 3141 | } |
| 3142 | |
| 3143 | if (session->ust_session != NULL) { |
| 3144 | (*domains)[index].type = LTTNG_DOMAIN_UST; |
| 3145 | index++; |
| 3146 | } |
| 3147 | |
| 3148 | return nb_dom; |
| 3149 | |
| 3150 | error: |
| 3151 | return ret; |
| 3152 | } |
| 3153 | |
| 3154 | /* |
| 3155 | * Command LTTNG_LIST_CHANNELS processed by the client thread. |
| 3156 | */ |
| 3157 | static ssize_t cmd_list_channels(int domain, struct ltt_session *session, |
| 3158 | struct lttng_channel **channels) |
| 3159 | { |
| 3160 | int ret; |
| 3161 | ssize_t nb_chan = 0; |
| 3162 | |
| 3163 | switch (domain) { |
| 3164 | case LTTNG_DOMAIN_KERNEL: |
| 3165 | if (session->kernel_session != NULL) { |
| 3166 | nb_chan = session->kernel_session->channel_count; |
| 3167 | } |
| 3168 | DBG3("Number of kernel channels %zd", nb_chan); |
| 3169 | break; |
| 3170 | case LTTNG_DOMAIN_UST: |
| 3171 | if (session->ust_session != NULL) { |
| 3172 | nb_chan = hashtable_get_count( |
| 3173 | session->ust_session->domain_global.channels); |
| 3174 | } |
| 3175 | DBG3("Number of UST global channels %zd", nb_chan); |
| 3176 | break; |
| 3177 | default: |
| 3178 | *channels = NULL; |
| 3179 | ret = -LTTCOMM_NOT_IMPLEMENTED; |
| 3180 | goto error; |
| 3181 | } |
| 3182 | |
| 3183 | if (nb_chan > 0) { |
| 3184 | *channels = zmalloc(nb_chan * sizeof(struct lttng_channel)); |
| 3185 | if (*channels == NULL) { |
| 3186 | ret = -LTTCOMM_FATAL; |
| 3187 | goto error; |
| 3188 | } |
| 3189 | |
| 3190 | list_lttng_channels(domain, session, *channels); |
| 3191 | } else { |
| 3192 | *channels = NULL; |
| 3193 | } |
| 3194 | |
| 3195 | return nb_chan; |
| 3196 | |
| 3197 | error: |
| 3198 | return ret; |
| 3199 | } |
| 3200 | |
| 3201 | /* |
| 3202 | * Command LTTNG_LIST_EVENTS processed by the client thread. |
| 3203 | */ |
| 3204 | static ssize_t cmd_list_events(int domain, struct ltt_session *session, |
| 3205 | char *channel_name, struct lttng_event **events) |
| 3206 | { |
| 3207 | int ret = 0; |
| 3208 | ssize_t nb_event = 0; |
| 3209 | |
| 3210 | switch (domain) { |
| 3211 | case LTTNG_DOMAIN_KERNEL: |
| 3212 | if (session->kernel_session != NULL) { |
| 3213 | nb_event = list_lttng_kernel_events(channel_name, |
| 3214 | session->kernel_session, events); |
| 3215 | } |
| 3216 | break; |
| 3217 | case LTTNG_DOMAIN_UST: |
| 3218 | { |
| 3219 | if (session->ust_session != NULL) { |
| 3220 | nb_event = list_lttng_ust_global_events(channel_name, |
| 3221 | &session->ust_session->domain_global, events); |
| 3222 | } |
| 3223 | break; |
| 3224 | } |
| 3225 | default: |
| 3226 | ret = -LTTCOMM_NOT_IMPLEMENTED; |
| 3227 | goto error; |
| 3228 | } |
| 3229 | |
| 3230 | ret = nb_event; |
| 3231 | |
| 3232 | error: |
| 3233 | return ret; |
| 3234 | } |
| 3235 | |
| 3236 | /* |
| 3237 | * Process the command requested by the lttng client within the command |
| 3238 | * context structure. This function make sure that the return structure (llm) |
| 3239 | * is set and ready for transmission before returning. |
| 3240 | * |
| 3241 | * Return any error encountered or 0 for success. |
| 3242 | */ |
| 3243 | static int process_client_msg(struct command_ctx *cmd_ctx) |
| 3244 | { |
| 3245 | int ret = LTTCOMM_OK; |
| 3246 | int need_tracing_session = 1; |
| 3247 | |
| 3248 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
| 3249 | |
| 3250 | /* |
| 3251 | * Check for command that don't needs to allocate a returned payload. We do |
| 3252 | * this here so we don't have to make the call for no payload at each |
| 3253 | * command. |
| 3254 | */ |
| 3255 | switch(cmd_ctx->lsm->cmd_type) { |
| 3256 | case LTTNG_LIST_SESSIONS: |
| 3257 | case LTTNG_LIST_TRACEPOINTS: |
| 3258 | case LTTNG_LIST_DOMAINS: |
| 3259 | case LTTNG_LIST_CHANNELS: |
| 3260 | case LTTNG_LIST_EVENTS: |
| 3261 | break; |
| 3262 | default: |
| 3263 | /* Setup lttng message with no payload */ |
| 3264 | ret = setup_lttng_msg(cmd_ctx, 0); |
| 3265 | if (ret < 0) { |
| 3266 | /* This label does not try to unlock the session */ |
| 3267 | goto init_setup_error; |
| 3268 | } |
| 3269 | } |
| 3270 | |
| 3271 | /* Commands that DO NOT need a session. */ |
| 3272 | switch (cmd_ctx->lsm->cmd_type) { |
| 3273 | case LTTNG_CALIBRATE: |
| 3274 | case LTTNG_CREATE_SESSION: |
| 3275 | case LTTNG_LIST_SESSIONS: |
| 3276 | case LTTNG_LIST_TRACEPOINTS: |
| 3277 | need_tracing_session = 0; |
| 3278 | break; |
| 3279 | default: |
| 3280 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); |
| 3281 | session_lock_list(); |
| 3282 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
| 3283 | session_unlock_list(); |
| 3284 | if (cmd_ctx->session == NULL) { |
| 3285 | if (cmd_ctx->lsm->session.name != NULL) { |
| 3286 | ret = LTTCOMM_SESS_NOT_FOUND; |
| 3287 | } else { |
| 3288 | /* If no session name specified */ |
| 3289 | ret = LTTCOMM_SELECT_SESS; |
| 3290 | } |
| 3291 | goto error; |
| 3292 | } else { |
| 3293 | /* Acquire lock for the session */ |
| 3294 | session_lock(cmd_ctx->session); |
| 3295 | } |
| 3296 | break; |
| 3297 | } |
| 3298 | |
| 3299 | /* |
| 3300 | * Check domain type for specific "pre-action". |
| 3301 | */ |
| 3302 | switch (cmd_ctx->lsm->domain.type) { |
| 3303 | case LTTNG_DOMAIN_KERNEL: |
| 3304 | /* Kernel tracer check */ |
| 3305 | if (kernel_tracer_fd == 0) { |
| 3306 | /* Basically, load kernel tracer modules */ |
| 3307 | init_kernel_tracer(); |
| 3308 | if (kernel_tracer_fd == 0) { |
| 3309 | ret = LTTCOMM_KERN_NA; |
| 3310 | goto error; |
| 3311 | } |
| 3312 | } |
| 3313 | |
| 3314 | /* Need a session for kernel command */ |
| 3315 | if (need_tracing_session) { |
| 3316 | if (cmd_ctx->session->kernel_session == NULL) { |
| 3317 | ret = create_kernel_session(cmd_ctx->session); |
| 3318 | if (ret < 0) { |
| 3319 | ret = LTTCOMM_KERN_SESS_FAIL; |
| 3320 | goto error; |
| 3321 | } |
| 3322 | } |
| 3323 | |
| 3324 | /* Start the kernel consumer daemon */ |
| 3325 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
| 3326 | if (kconsumer_data.pid == 0 && |
| 3327 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
| 3328 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
| 3329 | ret = start_consumerd(&kconsumer_data); |
| 3330 | if (ret < 0) { |
| 3331 | ret = LTTCOMM_KERN_CONSUMER_FAIL; |
| 3332 | goto error; |
| 3333 | } |
| 3334 | } else { |
| 3335 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
| 3336 | } |
| 3337 | } |
| 3338 | break; |
| 3339 | case LTTNG_DOMAIN_UST: |
| 3340 | { |
| 3341 | if (need_tracing_session) { |
| 3342 | if (cmd_ctx->session->ust_session == NULL) { |
| 3343 | ret = create_ust_session(cmd_ctx->session, |
| 3344 | &cmd_ctx->lsm->domain); |
| 3345 | if (ret != LTTCOMM_OK) { |
| 3346 | goto error; |
| 3347 | } |
| 3348 | } |
| 3349 | /* Start the UST consumer daemons */ |
| 3350 | /* 64-bit */ |
| 3351 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); |
| 3352 | if (consumerd64_bin[0] != '\0' && |
| 3353 | ustconsumer64_data.pid == 0 && |
| 3354 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
| 3355 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
| 3356 | ret = start_consumerd(&ustconsumer64_data); |
| 3357 | if (ret < 0) { |
| 3358 | ret = LTTCOMM_UST_CONSUMER64_FAIL; |
| 3359 | ust_consumerd64_fd = -EINVAL; |
| 3360 | goto error; |
| 3361 | } |
| 3362 | |
| 3363 | ust_consumerd64_fd = ustconsumer64_data.cmd_sock; |
| 3364 | } else { |
| 3365 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
| 3366 | } |
| 3367 | /* 32-bit */ |
| 3368 | if (consumerd32_bin[0] != '\0' && |
| 3369 | ustconsumer32_data.pid == 0 && |
| 3370 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
| 3371 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
| 3372 | ret = start_consumerd(&ustconsumer32_data); |
| 3373 | if (ret < 0) { |
| 3374 | ret = LTTCOMM_UST_CONSUMER32_FAIL; |
| 3375 | ust_consumerd32_fd = -EINVAL; |
| 3376 | goto error; |
| 3377 | } |
| 3378 | ust_consumerd32_fd = ustconsumer32_data.cmd_sock; |
| 3379 | } else { |
| 3380 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
| 3381 | } |
| 3382 | } |
| 3383 | break; |
| 3384 | } |
| 3385 | default: |
| 3386 | break; |
| 3387 | } |
| 3388 | |
| 3389 | /* Process by command type */ |
| 3390 | switch (cmd_ctx->lsm->cmd_type) { |
| 3391 | case LTTNG_ADD_CONTEXT: |
| 3392 | { |
| 3393 | ret = cmd_add_context(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 3394 | cmd_ctx->lsm->u.context.channel_name, |
| 3395 | cmd_ctx->lsm->u.context.event_name, |
| 3396 | &cmd_ctx->lsm->u.context.ctx); |
| 3397 | break; |
| 3398 | } |
| 3399 | case LTTNG_DISABLE_CHANNEL: |
| 3400 | { |
| 3401 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 3402 | cmd_ctx->lsm->u.disable.channel_name); |
| 3403 | break; |
| 3404 | } |
| 3405 | case LTTNG_DISABLE_EVENT: |
| 3406 | { |
| 3407 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 3408 | cmd_ctx->lsm->u.disable.channel_name, |
| 3409 | cmd_ctx->lsm->u.disable.name); |
| 3410 | ret = LTTCOMM_OK; |
| 3411 | break; |
| 3412 | } |
| 3413 | case LTTNG_DISABLE_ALL_EVENT: |
| 3414 | { |
| 3415 | DBG("Disabling all events"); |
| 3416 | |
| 3417 | ret = cmd_disable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 3418 | cmd_ctx->lsm->u.disable.channel_name); |
| 3419 | break; |
| 3420 | } |
| 3421 | case LTTNG_ENABLE_CHANNEL: |
| 3422 | { |
| 3423 | ret = cmd_enable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 3424 | &cmd_ctx->lsm->u.channel.chan); |
| 3425 | break; |
| 3426 | } |
| 3427 | case LTTNG_ENABLE_EVENT: |
| 3428 | { |
| 3429 | ret = cmd_enable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 3430 | cmd_ctx->lsm->u.enable.channel_name, |
| 3431 | &cmd_ctx->lsm->u.enable.event); |
| 3432 | break; |
| 3433 | } |
| 3434 | case LTTNG_ENABLE_ALL_EVENT: |
| 3435 | { |
| 3436 | DBG("Enabling all events"); |
| 3437 | |
| 3438 | ret = cmd_enable_event_all(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 3439 | cmd_ctx->lsm->u.enable.channel_name, |
| 3440 | cmd_ctx->lsm->u.enable.event.type); |
| 3441 | break; |
| 3442 | } |
| 3443 | case LTTNG_LIST_TRACEPOINTS: |
| 3444 | { |
| 3445 | struct lttng_event *events; |
| 3446 | ssize_t nb_events; |
| 3447 | |
| 3448 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
| 3449 | if (nb_events < 0) { |
| 3450 | ret = -nb_events; |
| 3451 | goto error; |
| 3452 | } |
| 3453 | |
| 3454 | /* |
| 3455 | * Setup lttng message with payload size set to the event list size in |
| 3456 | * bytes and then copy list into the llm payload. |
| 3457 | */ |
| 3458 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_event) * nb_events); |
| 3459 | if (ret < 0) { |
| 3460 | free(events); |
| 3461 | goto setup_error; |
| 3462 | } |
| 3463 | |
| 3464 | /* Copy event list into message payload */ |
| 3465 | memcpy(cmd_ctx->llm->payload, events, |
| 3466 | sizeof(struct lttng_event) * nb_events); |
| 3467 | |
| 3468 | free(events); |
| 3469 | |
| 3470 | ret = LTTCOMM_OK; |
| 3471 | break; |
| 3472 | } |
| 3473 | case LTTNG_START_TRACE: |
| 3474 | { |
| 3475 | ret = cmd_start_trace(cmd_ctx->session); |
| 3476 | break; |
| 3477 | } |
| 3478 | case LTTNG_STOP_TRACE: |
| 3479 | { |
| 3480 | ret = cmd_stop_trace(cmd_ctx->session); |
| 3481 | break; |
| 3482 | } |
| 3483 | case LTTNG_CREATE_SESSION: |
| 3484 | { |
| 3485 | ret = cmd_create_session(cmd_ctx->lsm->session.name, |
| 3486 | cmd_ctx->lsm->session.path); |
| 3487 | break; |
| 3488 | } |
| 3489 | case LTTNG_DESTROY_SESSION: |
| 3490 | { |
| 3491 | ret = cmd_destroy_session(cmd_ctx->session, |
| 3492 | cmd_ctx->lsm->session.name); |
| 3493 | break; |
| 3494 | } |
| 3495 | case LTTNG_LIST_DOMAINS: |
| 3496 | { |
| 3497 | ssize_t nb_dom; |
| 3498 | struct lttng_domain *domains; |
| 3499 | |
| 3500 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
| 3501 | if (nb_dom < 0) { |
| 3502 | ret = -nb_dom; |
| 3503 | goto error; |
| 3504 | } |
| 3505 | |
| 3506 | ret = setup_lttng_msg(cmd_ctx, nb_dom * sizeof(struct lttng_domain)); |
| 3507 | if (ret < 0) { |
| 3508 | goto setup_error; |
| 3509 | } |
| 3510 | |
| 3511 | /* Copy event list into message payload */ |
| 3512 | memcpy(cmd_ctx->llm->payload, domains, |
| 3513 | nb_dom * sizeof(struct lttng_domain)); |
| 3514 | |
| 3515 | free(domains); |
| 3516 | |
| 3517 | ret = LTTCOMM_OK; |
| 3518 | break; |
| 3519 | } |
| 3520 | case LTTNG_LIST_CHANNELS: |
| 3521 | { |
| 3522 | size_t nb_chan; |
| 3523 | struct lttng_channel *channels; |
| 3524 | |
| 3525 | nb_chan = cmd_list_channels(cmd_ctx->lsm->domain.type, |
| 3526 | cmd_ctx->session, &channels); |
| 3527 | if (nb_chan < 0) { |
| 3528 | ret = -nb_chan; |
| 3529 | goto error; |
| 3530 | } |
| 3531 | |
| 3532 | ret = setup_lttng_msg(cmd_ctx, nb_chan * sizeof(struct lttng_channel)); |
| 3533 | if (ret < 0) { |
| 3534 | goto setup_error; |
| 3535 | } |
| 3536 | |
| 3537 | /* Copy event list into message payload */ |
| 3538 | memcpy(cmd_ctx->llm->payload, channels, |
| 3539 | nb_chan * sizeof(struct lttng_channel)); |
| 3540 | |
| 3541 | free(channels); |
| 3542 | |
| 3543 | ret = LTTCOMM_OK; |
| 3544 | break; |
| 3545 | } |
| 3546 | case LTTNG_LIST_EVENTS: |
| 3547 | { |
| 3548 | ssize_t nb_event; |
| 3549 | struct lttng_event *events = NULL; |
| 3550 | |
| 3551 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, cmd_ctx->session, |
| 3552 | cmd_ctx->lsm->u.list.channel_name, &events); |
| 3553 | if (nb_event < 0) { |
| 3554 | ret = -nb_event; |
| 3555 | goto error; |
| 3556 | } |
| 3557 | |
| 3558 | ret = setup_lttng_msg(cmd_ctx, nb_event * sizeof(struct lttng_event)); |
| 3559 | if (ret < 0) { |
| 3560 | goto setup_error; |
| 3561 | } |
| 3562 | |
| 3563 | /* Copy event list into message payload */ |
| 3564 | memcpy(cmd_ctx->llm->payload, events, |
| 3565 | nb_event * sizeof(struct lttng_event)); |
| 3566 | |
| 3567 | free(events); |
| 3568 | |
| 3569 | ret = LTTCOMM_OK; |
| 3570 | break; |
| 3571 | } |
| 3572 | case LTTNG_LIST_SESSIONS: |
| 3573 | { |
| 3574 | session_lock_list(); |
| 3575 | |
| 3576 | if (session_list_ptr->count == 0) { |
| 3577 | ret = LTTCOMM_NO_SESSION; |
| 3578 | session_unlock_list(); |
| 3579 | goto error; |
| 3580 | } |
| 3581 | |
| 3582 | ret = setup_lttng_msg(cmd_ctx, sizeof(struct lttng_session) * |
| 3583 | session_list_ptr->count); |
| 3584 | if (ret < 0) { |
| 3585 | session_unlock_list(); |
| 3586 | goto setup_error; |
| 3587 | } |
| 3588 | |
| 3589 | /* Filled the session array */ |
| 3590 | list_lttng_sessions((struct lttng_session *)(cmd_ctx->llm->payload)); |
| 3591 | |
| 3592 | session_unlock_list(); |
| 3593 | |
| 3594 | ret = LTTCOMM_OK; |
| 3595 | break; |
| 3596 | } |
| 3597 | case LTTNG_CALIBRATE: |
| 3598 | { |
| 3599 | ret = cmd_calibrate(cmd_ctx->lsm->domain.type, |
| 3600 | &cmd_ctx->lsm->u.calibrate); |
| 3601 | break; |
| 3602 | } |
| 3603 | case LTTNG_REGISTER_CONSUMER: |
| 3604 | { |
| 3605 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 3606 | cmd_ctx->lsm->u.reg.path); |
| 3607 | break; |
| 3608 | } |
| 3609 | default: |
| 3610 | ret = LTTCOMM_UND; |
| 3611 | break; |
| 3612 | } |
| 3613 | |
| 3614 | error: |
| 3615 | if (cmd_ctx->llm == NULL) { |
| 3616 | DBG("Missing llm structure. Allocating one."); |
| 3617 | if (setup_lttng_msg(cmd_ctx, 0) < 0) { |
| 3618 | goto setup_error; |
| 3619 | } |
| 3620 | } |
| 3621 | /* Set return code */ |
| 3622 | cmd_ctx->llm->ret_code = ret; |
| 3623 | setup_error: |
| 3624 | if (cmd_ctx->session) { |
| 3625 | session_unlock(cmd_ctx->session); |
| 3626 | } |
| 3627 | init_setup_error: |
| 3628 | return ret; |
| 3629 | } |
| 3630 | |
| 3631 | /* |
| 3632 | * This thread manage all clients request using the unix client socket for |
| 3633 | * communication. |
| 3634 | */ |
| 3635 | static void *thread_manage_clients(void *data) |
| 3636 | { |
| 3637 | int sock = 0, ret, i, pollfd; |
| 3638 | uint32_t revents, nb_fd; |
| 3639 | struct command_ctx *cmd_ctx = NULL; |
| 3640 | struct lttng_poll_event events; |
| 3641 | |
| 3642 | DBG("[thread] Manage client started"); |
| 3643 | |
| 3644 | rcu_register_thread(); |
| 3645 | |
| 3646 | ret = lttcomm_listen_unix_sock(client_sock); |
| 3647 | if (ret < 0) { |
| 3648 | goto error; |
| 3649 | } |
| 3650 | |
| 3651 | /* |
| 3652 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing |
| 3653 | * more will be added to this poll set. |
| 3654 | */ |
| 3655 | ret = create_thread_poll_set(&events, 2); |
| 3656 | if (ret < 0) { |
| 3657 | goto error; |
| 3658 | } |
| 3659 | |
| 3660 | /* Add the application registration socket */ |
| 3661 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); |
| 3662 | if (ret < 0) { |
| 3663 | goto error; |
| 3664 | } |
| 3665 | |
| 3666 | /* |
| 3667 | * Notify parent pid that we are ready to accept command for client side. |
| 3668 | */ |
| 3669 | if (opt_sig_parent) { |
| 3670 | kill(ppid, SIGCHLD); |
| 3671 | } |
| 3672 | |
| 3673 | while (1) { |
| 3674 | DBG("Accepting client command ..."); |
| 3675 | |
| 3676 | nb_fd = LTTNG_POLL_GETNB(&events); |
| 3677 | |
| 3678 | /* Inifinite blocking call, waiting for transmission */ |
| 3679 | ret = lttng_poll_wait(&events, -1); |
| 3680 | if (ret < 0) { |
| 3681 | goto error; |
| 3682 | } |
| 3683 | |
| 3684 | for (i = 0; i < nb_fd; i++) { |
| 3685 | /* Fetch once the poll data */ |
| 3686 | revents = LTTNG_POLL_GETEV(&events, i); |
| 3687 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 3688 | |
| 3689 | /* Thread quit pipe has been closed. Killing thread. */ |
| 3690 | ret = check_thread_quit_pipe(pollfd, revents); |
| 3691 | if (ret) { |
| 3692 | goto error; |
| 3693 | } |
| 3694 | |
| 3695 | /* Event on the registration socket */ |
| 3696 | if (pollfd == client_sock) { |
| 3697 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 3698 | ERR("Client socket poll error"); |
| 3699 | goto error; |
| 3700 | } |
| 3701 | } |
| 3702 | } |
| 3703 | |
| 3704 | DBG("Wait for client response"); |
| 3705 | |
| 3706 | sock = lttcomm_accept_unix_sock(client_sock); |
| 3707 | if (sock < 0) { |
| 3708 | goto error; |
| 3709 | } |
| 3710 | |
| 3711 | /* Allocate context command to process the client request */ |
| 3712 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
| 3713 | if (cmd_ctx == NULL) { |
| 3714 | perror("zmalloc cmd_ctx"); |
| 3715 | goto error; |
| 3716 | } |
| 3717 | |
| 3718 | /* Allocate data buffer for reception */ |
| 3719 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
| 3720 | if (cmd_ctx->lsm == NULL) { |
| 3721 | perror("zmalloc cmd_ctx->lsm"); |
| 3722 | goto error; |
| 3723 | } |
| 3724 | |
| 3725 | cmd_ctx->llm = NULL; |
| 3726 | cmd_ctx->session = NULL; |
| 3727 | |
| 3728 | /* |
| 3729 | * Data is received from the lttng client. The struct |
| 3730 | * lttcomm_session_msg (lsm) contains the command and data request of |
| 3731 | * the client. |
| 3732 | */ |
| 3733 | DBG("Receiving data from client ..."); |
| 3734 | ret = lttcomm_recv_unix_sock(sock, cmd_ctx->lsm, |
| 3735 | sizeof(struct lttcomm_session_msg)); |
| 3736 | if (ret <= 0) { |
| 3737 | DBG("Nothing recv() from client... continuing"); |
| 3738 | close(sock); |
| 3739 | free(cmd_ctx); |
| 3740 | continue; |
| 3741 | } |
| 3742 | |
| 3743 | // TODO: Validate cmd_ctx including sanity check for |
| 3744 | // security purpose. |
| 3745 | |
| 3746 | rcu_thread_online(); |
| 3747 | /* |
| 3748 | * This function dispatch the work to the kernel or userspace tracer |
| 3749 | * libs and fill the lttcomm_lttng_msg data structure of all the needed |
| 3750 | * informations for the client. The command context struct contains |
| 3751 | * everything this function may needs. |
| 3752 | */ |
| 3753 | ret = process_client_msg(cmd_ctx); |
| 3754 | rcu_thread_offline(); |
| 3755 | if (ret < 0) { |
| 3756 | /* |
| 3757 | * TODO: Inform client somehow of the fatal error. At |
| 3758 | * this point, ret < 0 means that a zmalloc failed |
| 3759 | * (ENOMEM). Error detected but still accept command. |
| 3760 | */ |
| 3761 | clean_command_ctx(&cmd_ctx); |
| 3762 | continue; |
| 3763 | } |
| 3764 | |
| 3765 | DBG("Sending response (size: %d, retcode: %s)", |
| 3766 | cmd_ctx->lttng_msg_size, |
| 3767 | lttng_strerror(-cmd_ctx->llm->ret_code)); |
| 3768 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
| 3769 | if (ret < 0) { |
| 3770 | ERR("Failed to send data back to client"); |
| 3771 | } |
| 3772 | |
| 3773 | clean_command_ctx(&cmd_ctx); |
| 3774 | |
| 3775 | /* End of transmission */ |
| 3776 | close(sock); |
| 3777 | } |
| 3778 | |
| 3779 | error: |
| 3780 | DBG("Client thread dying"); |
| 3781 | unlink(client_unix_sock_path); |
| 3782 | close(client_sock); |
| 3783 | close(sock); |
| 3784 | |
| 3785 | lttng_poll_clean(&events); |
| 3786 | clean_command_ctx(&cmd_ctx); |
| 3787 | |
| 3788 | rcu_unregister_thread(); |
| 3789 | return NULL; |
| 3790 | } |
| 3791 | |
| 3792 | |
| 3793 | /* |
| 3794 | * usage function on stderr |
| 3795 | */ |
| 3796 | static void usage(void) |
| 3797 | { |
| 3798 | fprintf(stderr, "Usage: %s OPTIONS\n\nOptions:\n", progname); |
| 3799 | fprintf(stderr, " -h, --help Display this usage.\n"); |
| 3800 | fprintf(stderr, " -c, --client-sock PATH Specify path for the client unix socket\n"); |
| 3801 | fprintf(stderr, " -a, --apps-sock PATH Specify path for apps unix socket\n"); |
| 3802 | fprintf(stderr, " --kconsumerd-err-sock PATH Specify path for the kernel consumer error socket\n"); |
| 3803 | fprintf(stderr, " --kconsumerd-cmd-sock PATH Specify path for the kernel consumer command socket\n"); |
| 3804 | fprintf(stderr, " --ustconsumerd32-err-sock PATH Specify path for the 32-bit UST consumer error socket\n"); |
| 3805 | fprintf(stderr, " --ustconsumerd64-err-sock PATH Specify path for the 64-bit UST consumer error socket\n"); |
| 3806 | fprintf(stderr, " --ustconsumerd32-cmd-sock PATH Specify path for the 32-bit UST consumer command socket\n"); |
| 3807 | fprintf(stderr, " --ustconsumerd64-cmd-sock PATH Specify path for the 64-bit UST consumer command socket\n"); |
| 3808 | fprintf(stderr, " --consumerd32-path PATH Specify path for the 32-bit UST consumer daemon binary\n"); |
| 3809 | fprintf(stderr, " --consumerd32-libdir PATH Specify path for the 32-bit UST consumer daemon libraries\n"); |
| 3810 | fprintf(stderr, " --consumerd64-path PATH Specify path for the 64-bit UST consumer daemon binary\n"); |
| 3811 | fprintf(stderr, " --consumerd64-libdir PATH Specify path for the 64-bit UST consumer daemon libraries\n"); |
| 3812 | fprintf(stderr, " -d, --daemonize Start as a daemon.\n"); |
| 3813 | fprintf(stderr, " -g, --group NAME Specify the tracing group name. (default: tracing)\n"); |
| 3814 | fprintf(stderr, " -V, --version Show version number.\n"); |
| 3815 | fprintf(stderr, " -S, --sig-parent Send SIGCHLD to parent pid to notify readiness.\n"); |
| 3816 | fprintf(stderr, " -q, --quiet No output at all.\n"); |
| 3817 | fprintf(stderr, " -v, --verbose Verbose mode. Activate DBG() macro.\n"); |
| 3818 | fprintf(stderr, " --verbose-consumer Verbose mode for consumer. Activate DBG() macro.\n"); |
| 3819 | } |
| 3820 | |
| 3821 | /* |
| 3822 | * daemon argument parsing |
| 3823 | */ |
| 3824 | static int parse_args(int argc, char **argv) |
| 3825 | { |
| 3826 | int c; |
| 3827 | |
| 3828 | static struct option long_options[] = { |
| 3829 | { "client-sock", 1, 0, 'c' }, |
| 3830 | { "apps-sock", 1, 0, 'a' }, |
| 3831 | { "kconsumerd-cmd-sock", 1, 0, 'C' }, |
| 3832 | { "kconsumerd-err-sock", 1, 0, 'E' }, |
| 3833 | { "ustconsumerd32-cmd-sock", 1, 0, 'G' }, |
| 3834 | { "ustconsumerd32-err-sock", 1, 0, 'H' }, |
| 3835 | { "ustconsumerd64-cmd-sock", 1, 0, 'D' }, |
| 3836 | { "ustconsumerd64-err-sock", 1, 0, 'F' }, |
| 3837 | { "consumerd32-path", 1, 0, 'u' }, |
| 3838 | { "consumerd32-libdir", 1, 0, 'U' }, |
| 3839 | { "consumerd64-path", 1, 0, 't' }, |
| 3840 | { "consumerd64-libdir", 1, 0, 'T' }, |
| 3841 | { "daemonize", 0, 0, 'd' }, |
| 3842 | { "sig-parent", 0, 0, 'S' }, |
| 3843 | { "help", 0, 0, 'h' }, |
| 3844 | { "group", 1, 0, 'g' }, |
| 3845 | { "version", 0, 0, 'V' }, |
| 3846 | { "quiet", 0, 0, 'q' }, |
| 3847 | { "verbose", 0, 0, 'v' }, |
| 3848 | { "verbose-consumer", 0, 0, 'Z' }, |
| 3849 | { NULL, 0, 0, 0 } |
| 3850 | }; |
| 3851 | |
| 3852 | while (1) { |
| 3853 | int option_index = 0; |
| 3854 | c = getopt_long(argc, argv, "dhqvVS" "a:c:g:s:C:E:D:F:Z:u:t", |
| 3855 | long_options, &option_index); |
| 3856 | if (c == -1) { |
| 3857 | break; |
| 3858 | } |
| 3859 | |
| 3860 | switch (c) { |
| 3861 | case 0: |
| 3862 | fprintf(stderr, "option %s", long_options[option_index].name); |
| 3863 | if (optarg) { |
| 3864 | fprintf(stderr, " with arg %s\n", optarg); |
| 3865 | } |
| 3866 | break; |
| 3867 | case 'c': |
| 3868 | snprintf(client_unix_sock_path, PATH_MAX, "%s", optarg); |
| 3869 | break; |
| 3870 | case 'a': |
| 3871 | snprintf(apps_unix_sock_path, PATH_MAX, "%s", optarg); |
| 3872 | break; |
| 3873 | case 'd': |
| 3874 | opt_daemon = 1; |
| 3875 | break; |
| 3876 | case 'g': |
| 3877 | opt_tracing_group = optarg; |
| 3878 | break; |
| 3879 | case 'h': |
| 3880 | usage(); |
| 3881 | exit(EXIT_FAILURE); |
| 3882 | case 'V': |
| 3883 | fprintf(stdout, "%s\n", VERSION); |
| 3884 | exit(EXIT_SUCCESS); |
| 3885 | case 'S': |
| 3886 | opt_sig_parent = 1; |
| 3887 | break; |
| 3888 | case 'E': |
| 3889 | snprintf(kconsumer_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
| 3890 | break; |
| 3891 | case 'C': |
| 3892 | snprintf(kconsumer_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
| 3893 | break; |
| 3894 | case 'F': |
| 3895 | snprintf(ustconsumer64_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
| 3896 | break; |
| 3897 | case 'D': |
| 3898 | snprintf(ustconsumer64_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
| 3899 | break; |
| 3900 | case 'H': |
| 3901 | snprintf(ustconsumer32_data.err_unix_sock_path, PATH_MAX, "%s", optarg); |
| 3902 | break; |
| 3903 | case 'G': |
| 3904 | snprintf(ustconsumer32_data.cmd_unix_sock_path, PATH_MAX, "%s", optarg); |
| 3905 | break; |
| 3906 | case 'q': |
| 3907 | opt_quiet = 1; |
| 3908 | break; |
| 3909 | case 'v': |
| 3910 | /* Verbose level can increase using multiple -v */ |
| 3911 | opt_verbose += 1; |
| 3912 | break; |
| 3913 | case 'Z': |
| 3914 | opt_verbose_consumer += 1; |
| 3915 | break; |
| 3916 | case 'u': |
| 3917 | consumerd32_bin= optarg; |
| 3918 | break; |
| 3919 | case 'U': |
| 3920 | consumerd32_libdir = optarg; |
| 3921 | break; |
| 3922 | case 't': |
| 3923 | consumerd64_bin = optarg; |
| 3924 | break; |
| 3925 | case 'T': |
| 3926 | consumerd64_libdir = optarg; |
| 3927 | break; |
| 3928 | default: |
| 3929 | /* Unknown option or other error. |
| 3930 | * Error is printed by getopt, just return */ |
| 3931 | return -1; |
| 3932 | } |
| 3933 | } |
| 3934 | |
| 3935 | return 0; |
| 3936 | } |
| 3937 | |
| 3938 | /* |
| 3939 | * Creates the two needed socket by the daemon. |
| 3940 | * apps_sock - The communication socket for all UST apps. |
| 3941 | * client_sock - The communication of the cli tool (lttng). |
| 3942 | */ |
| 3943 | static int init_daemon_socket(void) |
| 3944 | { |
| 3945 | int ret = 0; |
| 3946 | mode_t old_umask; |
| 3947 | |
| 3948 | old_umask = umask(0); |
| 3949 | |
| 3950 | /* Create client tool unix socket */ |
| 3951 | client_sock = lttcomm_create_unix_sock(client_unix_sock_path); |
| 3952 | if (client_sock < 0) { |
| 3953 | ERR("Create unix sock failed: %s", client_unix_sock_path); |
| 3954 | ret = -1; |
| 3955 | goto end; |
| 3956 | } |
| 3957 | |
| 3958 | /* File permission MUST be 660 */ |
| 3959 | ret = chmod(client_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 3960 | if (ret < 0) { |
| 3961 | ERR("Set file permissions failed: %s", client_unix_sock_path); |
| 3962 | perror("chmod"); |
| 3963 | goto end; |
| 3964 | } |
| 3965 | |
| 3966 | /* Create the application unix socket */ |
| 3967 | apps_sock = lttcomm_create_unix_sock(apps_unix_sock_path); |
| 3968 | if (apps_sock < 0) { |
| 3969 | ERR("Create unix sock failed: %s", apps_unix_sock_path); |
| 3970 | ret = -1; |
| 3971 | goto end; |
| 3972 | } |
| 3973 | |
| 3974 | /* File permission MUST be 666 */ |
| 3975 | ret = chmod(apps_unix_sock_path, |
| 3976 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
| 3977 | if (ret < 0) { |
| 3978 | ERR("Set file permissions failed: %s", apps_unix_sock_path); |
| 3979 | perror("chmod"); |
| 3980 | goto end; |
| 3981 | } |
| 3982 | |
| 3983 | end: |
| 3984 | umask(old_umask); |
| 3985 | return ret; |
| 3986 | } |
| 3987 | |
| 3988 | /* |
| 3989 | * Check if the global socket is available, and if a daemon is answering at the |
| 3990 | * other side. If yes, error is returned. |
| 3991 | */ |
| 3992 | static int check_existing_daemon(void) |
| 3993 | { |
| 3994 | if (access(client_unix_sock_path, F_OK) < 0 && |
| 3995 | access(apps_unix_sock_path, F_OK) < 0) { |
| 3996 | return 0; |
| 3997 | } |
| 3998 | |
| 3999 | /* Is there anybody out there ? */ |
| 4000 | if (lttng_session_daemon_alive()) { |
| 4001 | return -EEXIST; |
| 4002 | } else { |
| 4003 | return 0; |
| 4004 | } |
| 4005 | } |
| 4006 | |
| 4007 | /* |
| 4008 | * Set the tracing group gid onto the client socket. |
| 4009 | * |
| 4010 | * Race window between mkdir and chown is OK because we are going from more |
| 4011 | * permissive (root.root) to les permissive (root.tracing). |
| 4012 | */ |
| 4013 | static int set_permissions(void) |
| 4014 | { |
| 4015 | int ret; |
| 4016 | gid_t gid; |
| 4017 | |
| 4018 | gid = allowed_group(); |
| 4019 | if (gid < 0) { |
| 4020 | if (is_root) { |
| 4021 | WARN("No tracing group detected"); |
| 4022 | ret = 0; |
| 4023 | } else { |
| 4024 | ERR("Missing tracing group. Aborting execution."); |
| 4025 | ret = -1; |
| 4026 | } |
| 4027 | goto end; |
| 4028 | } |
| 4029 | |
| 4030 | /* Set lttng run dir */ |
| 4031 | ret = chown(LTTNG_RUNDIR, 0, gid); |
| 4032 | if (ret < 0) { |
| 4033 | ERR("Unable to set group on " LTTNG_RUNDIR); |
| 4034 | perror("chown"); |
| 4035 | } |
| 4036 | |
| 4037 | /* lttng client socket path */ |
| 4038 | ret = chown(client_unix_sock_path, 0, gid); |
| 4039 | if (ret < 0) { |
| 4040 | ERR("Unable to set group on %s", client_unix_sock_path); |
| 4041 | perror("chown"); |
| 4042 | } |
| 4043 | |
| 4044 | /* kconsumer error socket path */ |
| 4045 | ret = chown(kconsumer_data.err_unix_sock_path, 0, gid); |
| 4046 | if (ret < 0) { |
| 4047 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
| 4048 | perror("chown"); |
| 4049 | } |
| 4050 | |
| 4051 | /* 64-bit ustconsumer error socket path */ |
| 4052 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, gid); |
| 4053 | if (ret < 0) { |
| 4054 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); |
| 4055 | perror("chown"); |
| 4056 | } |
| 4057 | |
| 4058 | /* 32-bit ustconsumer compat32 error socket path */ |
| 4059 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, gid); |
| 4060 | if (ret < 0) { |
| 4061 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
| 4062 | perror("chown"); |
| 4063 | } |
| 4064 | |
| 4065 | DBG("All permissions are set"); |
| 4066 | |
| 4067 | end: |
| 4068 | return ret; |
| 4069 | } |
| 4070 | |
| 4071 | /* |
| 4072 | * Create the pipe used to wake up the kernel thread. |
| 4073 | */ |
| 4074 | static int create_kernel_poll_pipe(void) |
| 4075 | { |
| 4076 | return pipe2(kernel_poll_pipe, O_CLOEXEC); |
| 4077 | } |
| 4078 | |
| 4079 | /* |
| 4080 | * Create the application command pipe to wake thread_manage_apps. |
| 4081 | */ |
| 4082 | static int create_apps_cmd_pipe(void) |
| 4083 | { |
| 4084 | return pipe2(apps_cmd_pipe, O_CLOEXEC); |
| 4085 | } |
| 4086 | |
| 4087 | /* |
| 4088 | * Create the lttng run directory needed for all global sockets and pipe. |
| 4089 | */ |
| 4090 | static int create_lttng_rundir(void) |
| 4091 | { |
| 4092 | int ret; |
| 4093 | |
| 4094 | ret = mkdir(LTTNG_RUNDIR, S_IRWXU | S_IRWXG ); |
| 4095 | if (ret < 0) { |
| 4096 | if (errno != EEXIST) { |
| 4097 | ERR("Unable to create " LTTNG_RUNDIR); |
| 4098 | goto error; |
| 4099 | } else { |
| 4100 | ret = 0; |
| 4101 | } |
| 4102 | } |
| 4103 | |
| 4104 | error: |
| 4105 | return ret; |
| 4106 | } |
| 4107 | |
| 4108 | /* |
| 4109 | * Setup sockets and directory needed by the kconsumerd communication with the |
| 4110 | * session daemon. |
| 4111 | */ |
| 4112 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
| 4113 | { |
| 4114 | int ret; |
| 4115 | const char *path; |
| 4116 | |
| 4117 | switch (consumer_data->type) { |
| 4118 | case LTTNG_CONSUMER_KERNEL: |
| 4119 | path = KCONSUMERD_PATH; |
| 4120 | break; |
| 4121 | case LTTNG_CONSUMER64_UST: |
| 4122 | path = USTCONSUMERD64_PATH; |
| 4123 | break; |
| 4124 | case LTTNG_CONSUMER32_UST: |
| 4125 | path = USTCONSUMERD32_PATH; |
| 4126 | break; |
| 4127 | default: |
| 4128 | ERR("Consumer type unknown"); |
| 4129 | ret = -EINVAL; |
| 4130 | goto error; |
| 4131 | } |
| 4132 | |
| 4133 | ret = mkdir(path, S_IRWXU | S_IRWXG); |
| 4134 | if (ret < 0) { |
| 4135 | if (errno != EEXIST) { |
| 4136 | ERR("Failed to create %s", path); |
| 4137 | goto error; |
| 4138 | } |
| 4139 | ret = 0; |
| 4140 | } |
| 4141 | |
| 4142 | /* Create the kconsumerd error unix socket */ |
| 4143 | consumer_data->err_sock = |
| 4144 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); |
| 4145 | if (consumer_data->err_sock < 0) { |
| 4146 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); |
| 4147 | ret = -1; |
| 4148 | goto error; |
| 4149 | } |
| 4150 | |
| 4151 | /* File permission MUST be 660 */ |
| 4152 | ret = chmod(consumer_data->err_unix_sock_path, |
| 4153 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 4154 | if (ret < 0) { |
| 4155 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
| 4156 | perror("chmod"); |
| 4157 | goto error; |
| 4158 | } |
| 4159 | |
| 4160 | error: |
| 4161 | return ret; |
| 4162 | } |
| 4163 | |
| 4164 | /* |
| 4165 | * Signal handler for the daemon |
| 4166 | * |
| 4167 | * Simply stop all worker threads, leaving main() return gracefully after |
| 4168 | * joining all threads and calling cleanup(). |
| 4169 | */ |
| 4170 | static void sighandler(int sig) |
| 4171 | { |
| 4172 | switch (sig) { |
| 4173 | case SIGPIPE: |
| 4174 | DBG("SIGPIPE catched"); |
| 4175 | return; |
| 4176 | case SIGINT: |
| 4177 | DBG("SIGINT catched"); |
| 4178 | stop_threads(); |
| 4179 | break; |
| 4180 | case SIGTERM: |
| 4181 | DBG("SIGTERM catched"); |
| 4182 | stop_threads(); |
| 4183 | break; |
| 4184 | default: |
| 4185 | break; |
| 4186 | } |
| 4187 | } |
| 4188 | |
| 4189 | /* |
| 4190 | * Setup signal handler for : |
| 4191 | * SIGINT, SIGTERM, SIGPIPE |
| 4192 | */ |
| 4193 | static int set_signal_handler(void) |
| 4194 | { |
| 4195 | int ret = 0; |
| 4196 | struct sigaction sa; |
| 4197 | sigset_t sigset; |
| 4198 | |
| 4199 | if ((ret = sigemptyset(&sigset)) < 0) { |
| 4200 | perror("sigemptyset"); |
| 4201 | return ret; |
| 4202 | } |
| 4203 | |
| 4204 | sa.sa_handler = sighandler; |
| 4205 | sa.sa_mask = sigset; |
| 4206 | sa.sa_flags = 0; |
| 4207 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
| 4208 | perror("sigaction"); |
| 4209 | return ret; |
| 4210 | } |
| 4211 | |
| 4212 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
| 4213 | perror("sigaction"); |
| 4214 | return ret; |
| 4215 | } |
| 4216 | |
| 4217 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
| 4218 | perror("sigaction"); |
| 4219 | return ret; |
| 4220 | } |
| 4221 | |
| 4222 | DBG("Signal handler set for SIGTERM, SIGPIPE and SIGINT"); |
| 4223 | |
| 4224 | return ret; |
| 4225 | } |
| 4226 | |
| 4227 | /* |
| 4228 | * Set open files limit to unlimited. This daemon can open a large number of |
| 4229 | * file descriptors in order to consumer multiple kernel traces. |
| 4230 | */ |
| 4231 | static void set_ulimit(void) |
| 4232 | { |
| 4233 | int ret; |
| 4234 | struct rlimit lim; |
| 4235 | |
| 4236 | /* The kernel does not allowed an infinite limit for open files */ |
| 4237 | lim.rlim_cur = 65535; |
| 4238 | lim.rlim_max = 65535; |
| 4239 | |
| 4240 | ret = setrlimit(RLIMIT_NOFILE, &lim); |
| 4241 | if (ret < 0) { |
| 4242 | perror("failed to set open files limit"); |
| 4243 | } |
| 4244 | } |
| 4245 | |
| 4246 | /* |
| 4247 | * main |
| 4248 | */ |
| 4249 | int main(int argc, char **argv) |
| 4250 | { |
| 4251 | int ret = 0; |
| 4252 | void *status; |
| 4253 | const char *home_path; |
| 4254 | |
| 4255 | rcu_register_thread(); |
| 4256 | |
| 4257 | /* Create thread quit pipe */ |
| 4258 | if ((ret = init_thread_quit_pipe()) < 0) { |
| 4259 | goto error; |
| 4260 | } |
| 4261 | |
| 4262 | setup_consumerd_path(); |
| 4263 | |
| 4264 | /* Parse arguments */ |
| 4265 | progname = argv[0]; |
| 4266 | if ((ret = parse_args(argc, argv) < 0)) { |
| 4267 | goto error; |
| 4268 | } |
| 4269 | |
| 4270 | /* Daemonize */ |
| 4271 | if (opt_daemon) { |
| 4272 | ret = daemon(0, 0); |
| 4273 | if (ret < 0) { |
| 4274 | perror("daemon"); |
| 4275 | goto error; |
| 4276 | } |
| 4277 | } |
| 4278 | |
| 4279 | /* Check if daemon is UID = 0 */ |
| 4280 | is_root = !getuid(); |
| 4281 | |
| 4282 | if (is_root) { |
| 4283 | ret = create_lttng_rundir(); |
| 4284 | if (ret < 0) { |
| 4285 | goto error; |
| 4286 | } |
| 4287 | |
| 4288 | if (strlen(apps_unix_sock_path) == 0) { |
| 4289 | snprintf(apps_unix_sock_path, PATH_MAX, |
| 4290 | DEFAULT_GLOBAL_APPS_UNIX_SOCK); |
| 4291 | } |
| 4292 | |
| 4293 | if (strlen(client_unix_sock_path) == 0) { |
| 4294 | snprintf(client_unix_sock_path, PATH_MAX, |
| 4295 | DEFAULT_GLOBAL_CLIENT_UNIX_SOCK); |
| 4296 | } |
| 4297 | |
| 4298 | /* Set global SHM for ust */ |
| 4299 | if (strlen(wait_shm_path) == 0) { |
| 4300 | snprintf(wait_shm_path, PATH_MAX, |
| 4301 | DEFAULT_GLOBAL_APPS_WAIT_SHM_PATH); |
| 4302 | } |
| 4303 | } else { |
| 4304 | home_path = get_home_dir(); |
| 4305 | if (home_path == NULL) { |
| 4306 | /* TODO: Add --socket PATH option */ |
| 4307 | ERR("Can't get HOME directory for sockets creation."); |
| 4308 | ret = -EPERM; |
| 4309 | goto error; |
| 4310 | } |
| 4311 | |
| 4312 | if (strlen(apps_unix_sock_path) == 0) { |
| 4313 | snprintf(apps_unix_sock_path, PATH_MAX, |
| 4314 | DEFAULT_HOME_APPS_UNIX_SOCK, home_path); |
| 4315 | } |
| 4316 | |
| 4317 | /* Set the cli tool unix socket path */ |
| 4318 | if (strlen(client_unix_sock_path) == 0) { |
| 4319 | snprintf(client_unix_sock_path, PATH_MAX, |
| 4320 | DEFAULT_HOME_CLIENT_UNIX_SOCK, home_path); |
| 4321 | } |
| 4322 | |
| 4323 | /* Set global SHM for ust */ |
| 4324 | if (strlen(wait_shm_path) == 0) { |
| 4325 | snprintf(wait_shm_path, PATH_MAX, |
| 4326 | DEFAULT_HOME_APPS_WAIT_SHM_PATH, geteuid()); |
| 4327 | } |
| 4328 | } |
| 4329 | |
| 4330 | DBG("Client socket path %s", client_unix_sock_path); |
| 4331 | DBG("Application socket path %s", apps_unix_sock_path); |
| 4332 | |
| 4333 | /* |
| 4334 | * See if daemon already exist. |
| 4335 | */ |
| 4336 | if ((ret = check_existing_daemon()) < 0) { |
| 4337 | ERR("Already running daemon.\n"); |
| 4338 | /* |
| 4339 | * We do not goto exit because we must not cleanup() |
| 4340 | * because a daemon is already running. |
| 4341 | */ |
| 4342 | goto error; |
| 4343 | } |
| 4344 | |
| 4345 | /* After this point, we can safely call cleanup() with "goto exit" */ |
| 4346 | |
| 4347 | /* |
| 4348 | * These actions must be executed as root. We do that *after* setting up |
| 4349 | * the sockets path because we MUST make the check for another daemon using |
| 4350 | * those paths *before* trying to set the kernel consumer sockets and init |
| 4351 | * kernel tracer. |
| 4352 | */ |
| 4353 | if (is_root) { |
| 4354 | ret = set_consumer_sockets(&kconsumer_data); |
| 4355 | if (ret < 0) { |
| 4356 | goto exit; |
| 4357 | } |
| 4358 | |
| 4359 | ret = set_consumer_sockets(&ustconsumer64_data); |
| 4360 | if (ret < 0) { |
| 4361 | goto exit; |
| 4362 | } |
| 4363 | |
| 4364 | ret = set_consumer_sockets(&ustconsumer32_data); |
| 4365 | if (ret < 0) { |
| 4366 | goto exit; |
| 4367 | } |
| 4368 | |
| 4369 | /* Setup kernel tracer */ |
| 4370 | init_kernel_tracer(); |
| 4371 | |
| 4372 | /* Set ulimit for open files */ |
| 4373 | set_ulimit(); |
| 4374 | } |
| 4375 | |
| 4376 | if ((ret = set_signal_handler()) < 0) { |
| 4377 | goto exit; |
| 4378 | } |
| 4379 | |
| 4380 | /* Setup the needed unix socket */ |
| 4381 | if ((ret = init_daemon_socket()) < 0) { |
| 4382 | goto exit; |
| 4383 | } |
| 4384 | |
| 4385 | /* Set credentials to socket */ |
| 4386 | if (is_root && ((ret = set_permissions()) < 0)) { |
| 4387 | goto exit; |
| 4388 | } |
| 4389 | |
| 4390 | /* Get parent pid if -S, --sig-parent is specified. */ |
| 4391 | if (opt_sig_parent) { |
| 4392 | ppid = getppid(); |
| 4393 | } |
| 4394 | |
| 4395 | /* Setup the kernel pipe for waking up the kernel thread */ |
| 4396 | if ((ret = create_kernel_poll_pipe()) < 0) { |
| 4397 | goto exit; |
| 4398 | } |
| 4399 | |
| 4400 | /* Setup the thread apps communication pipe. */ |
| 4401 | if ((ret = create_apps_cmd_pipe()) < 0) { |
| 4402 | goto exit; |
| 4403 | } |
| 4404 | |
| 4405 | /* Init UST command queue. */ |
| 4406 | cds_wfq_init(&ust_cmd_queue.queue); |
| 4407 | |
| 4408 | /* Init UST app hash table */ |
| 4409 | ust_app_ht_alloc(); |
| 4410 | |
| 4411 | /* |
| 4412 | * Get session list pointer. This pointer MUST NOT be free(). This list is |
| 4413 | * statically declared in session.c |
| 4414 | */ |
| 4415 | session_list_ptr = session_get_list(); |
| 4416 | |
| 4417 | /* Set up max poll set size */ |
| 4418 | lttng_poll_set_max_size(); |
| 4419 | |
| 4420 | /* Create thread to manage the client socket */ |
| 4421 | ret = pthread_create(&client_thread, NULL, |
| 4422 | thread_manage_clients, (void *) NULL); |
| 4423 | if (ret != 0) { |
| 4424 | perror("pthread_create clients"); |
| 4425 | goto exit_client; |
| 4426 | } |
| 4427 | |
| 4428 | /* Create thread to dispatch registration */ |
| 4429 | ret = pthread_create(&dispatch_thread, NULL, |
| 4430 | thread_dispatch_ust_registration, (void *) NULL); |
| 4431 | if (ret != 0) { |
| 4432 | perror("pthread_create dispatch"); |
| 4433 | goto exit_dispatch; |
| 4434 | } |
| 4435 | |
| 4436 | /* Create thread to manage application registration. */ |
| 4437 | ret = pthread_create(®_apps_thread, NULL, |
| 4438 | thread_registration_apps, (void *) NULL); |
| 4439 | if (ret != 0) { |
| 4440 | perror("pthread_create registration"); |
| 4441 | goto exit_reg_apps; |
| 4442 | } |
| 4443 | |
| 4444 | /* Create thread to manage application socket */ |
| 4445 | ret = pthread_create(&apps_thread, NULL, |
| 4446 | thread_manage_apps, (void *) NULL); |
| 4447 | if (ret != 0) { |
| 4448 | perror("pthread_create apps"); |
| 4449 | goto exit_apps; |
| 4450 | } |
| 4451 | |
| 4452 | /* Create kernel thread to manage kernel event */ |
| 4453 | ret = pthread_create(&kernel_thread, NULL, |
| 4454 | thread_manage_kernel, (void *) NULL); |
| 4455 | if (ret != 0) { |
| 4456 | perror("pthread_create kernel"); |
| 4457 | goto exit_kernel; |
| 4458 | } |
| 4459 | |
| 4460 | ret = pthread_join(kernel_thread, &status); |
| 4461 | if (ret != 0) { |
| 4462 | perror("pthread_join"); |
| 4463 | goto error; /* join error, exit without cleanup */ |
| 4464 | } |
| 4465 | |
| 4466 | exit_kernel: |
| 4467 | ret = pthread_join(apps_thread, &status); |
| 4468 | if (ret != 0) { |
| 4469 | perror("pthread_join"); |
| 4470 | goto error; /* join error, exit without cleanup */ |
| 4471 | } |
| 4472 | |
| 4473 | exit_apps: |
| 4474 | ret = pthread_join(reg_apps_thread, &status); |
| 4475 | if (ret != 0) { |
| 4476 | perror("pthread_join"); |
| 4477 | goto error; /* join error, exit without cleanup */ |
| 4478 | } |
| 4479 | |
| 4480 | exit_reg_apps: |
| 4481 | ret = pthread_join(dispatch_thread, &status); |
| 4482 | if (ret != 0) { |
| 4483 | perror("pthread_join"); |
| 4484 | goto error; /* join error, exit without cleanup */ |
| 4485 | } |
| 4486 | |
| 4487 | exit_dispatch: |
| 4488 | ret = pthread_join(client_thread, &status); |
| 4489 | if (ret != 0) { |
| 4490 | perror("pthread_join"); |
| 4491 | goto error; /* join error, exit without cleanup */ |
| 4492 | } |
| 4493 | |
| 4494 | ret = join_consumer_thread(&kconsumer_data); |
| 4495 | if (ret != 0) { |
| 4496 | perror("join_consumer"); |
| 4497 | goto error; /* join error, exit without cleanup */ |
| 4498 | } |
| 4499 | |
| 4500 | exit_client: |
| 4501 | exit: |
| 4502 | /* |
| 4503 | * cleanup() is called when no other thread is running. |
| 4504 | */ |
| 4505 | rcu_thread_online(); |
| 4506 | cleanup(); |
| 4507 | rcu_thread_offline(); |
| 4508 | rcu_unregister_thread(); |
| 4509 | if (!ret) |
| 4510 | exit(EXIT_SUCCESS); |
| 4511 | error: |
| 4512 | exit(EXIT_FAILURE); |
| 4513 | } |