| 1 | /* |
| 2 | * Copyright (C) 2011 - David Goulet <david.goulet@polymtl.ca> |
| 3 | * Mathieu Desnoyers <mathieu.desnoyers@efficios.com> |
| 4 | * 2013 - Jérémie Galarneau <jeremie.galarneau@efficios.com> |
| 5 | * |
| 6 | * This program is free software; you can redistribute it and/or modify |
| 7 | * it under the terms of the GNU General Public License, version 2 only, |
| 8 | * as published by the Free Software Foundation. |
| 9 | * |
| 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 13 | * GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License along |
| 16 | * with this program; if not, write to the Free Software Foundation, Inc., |
| 17 | * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | */ |
| 19 | |
| 20 | #define _LGPL_SOURCE |
| 21 | #include <getopt.h> |
| 22 | #include <grp.h> |
| 23 | #include <limits.h> |
| 24 | #include <paths.h> |
| 25 | #include <pthread.h> |
| 26 | #include <signal.h> |
| 27 | #include <stdio.h> |
| 28 | #include <stdlib.h> |
| 29 | #include <string.h> |
| 30 | #include <inttypes.h> |
| 31 | #include <sys/mman.h> |
| 32 | #include <sys/mount.h> |
| 33 | #include <sys/resource.h> |
| 34 | #include <sys/socket.h> |
| 35 | #include <sys/stat.h> |
| 36 | #include <sys/types.h> |
| 37 | #include <sys/wait.h> |
| 38 | #include <urcu/uatomic.h> |
| 39 | #include <unistd.h> |
| 40 | #include <ctype.h> |
| 41 | |
| 42 | #include <common/common.h> |
| 43 | #include <common/compat/socket.h> |
| 44 | #include <common/compat/getenv.h> |
| 45 | #include <common/defaults.h> |
| 46 | #include <common/kernel-consumer/kernel-consumer.h> |
| 47 | #include <common/futex.h> |
| 48 | #include <common/relayd/relayd.h> |
| 49 | #include <common/utils.h> |
| 50 | #include <common/daemonize.h> |
| 51 | #include <common/config/session-config.h> |
| 52 | #include <common/dynamic-buffer.h> |
| 53 | #include <lttng/userspace-probe-internal.h> |
| 54 | #include <lttng/event-internal.h> |
| 55 | |
| 56 | #include "lttng-sessiond.h" |
| 57 | #include "buffer-registry.h" |
| 58 | #include "channel.h" |
| 59 | #include "cmd.h" |
| 60 | #include "consumer.h" |
| 61 | #include "context.h" |
| 62 | #include "event.h" |
| 63 | #include "kernel.h" |
| 64 | #include "kernel-consumer.h" |
| 65 | #include "modprobe.h" |
| 66 | #include "shm.h" |
| 67 | #include "ust-ctl.h" |
| 68 | #include "ust-consumer.h" |
| 69 | #include "utils.h" |
| 70 | #include "fd-limit.h" |
| 71 | #include "health-sessiond.h" |
| 72 | #include "testpoint.h" |
| 73 | #include "ust-thread.h" |
| 74 | #include "agent-thread.h" |
| 75 | #include "save.h" |
| 76 | #include "load-session-thread.h" |
| 77 | #include "notification-thread.h" |
| 78 | #include "notification-thread-commands.h" |
| 79 | #include "rotation-thread.h" |
| 80 | #include "lttng-syscall.h" |
| 81 | #include "agent.h" |
| 82 | #include "ht-cleanup.h" |
| 83 | #include "sessiond-config.h" |
| 84 | #include "timer.h" |
| 85 | |
| 86 | static const char *help_msg = |
| 87 | #ifdef LTTNG_EMBED_HELP |
| 88 | #include <lttng-sessiond.8.h> |
| 89 | #else |
| 90 | NULL |
| 91 | #endif |
| 92 | ; |
| 93 | |
| 94 | const char *progname; |
| 95 | static int lockfile_fd = -1; |
| 96 | |
| 97 | /* Set to 1 when a SIGUSR1 signal is received. */ |
| 98 | static int recv_child_signal; |
| 99 | |
| 100 | static struct lttng_kernel_tracer_version kernel_tracer_version; |
| 101 | static struct lttng_kernel_tracer_abi_version kernel_tracer_abi_version; |
| 102 | |
| 103 | /* |
| 104 | * Consumer daemon specific control data. Every value not initialized here is |
| 105 | * set to 0 by the static definition. |
| 106 | */ |
| 107 | static struct consumer_data kconsumer_data = { |
| 108 | .type = LTTNG_CONSUMER_KERNEL, |
| 109 | .err_sock = -1, |
| 110 | .cmd_sock = -1, |
| 111 | .channel_monitor_pipe = -1, |
| 112 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
| 113 | .lock = PTHREAD_MUTEX_INITIALIZER, |
| 114 | .cond = PTHREAD_COND_INITIALIZER, |
| 115 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, |
| 116 | }; |
| 117 | static struct consumer_data ustconsumer64_data = { |
| 118 | .type = LTTNG_CONSUMER64_UST, |
| 119 | .err_sock = -1, |
| 120 | .cmd_sock = -1, |
| 121 | .channel_monitor_pipe = -1, |
| 122 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
| 123 | .lock = PTHREAD_MUTEX_INITIALIZER, |
| 124 | .cond = PTHREAD_COND_INITIALIZER, |
| 125 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, |
| 126 | }; |
| 127 | static struct consumer_data ustconsumer32_data = { |
| 128 | .type = LTTNG_CONSUMER32_UST, |
| 129 | .err_sock = -1, |
| 130 | .cmd_sock = -1, |
| 131 | .channel_monitor_pipe = -1, |
| 132 | .pid_mutex = PTHREAD_MUTEX_INITIALIZER, |
| 133 | .lock = PTHREAD_MUTEX_INITIALIZER, |
| 134 | .cond = PTHREAD_COND_INITIALIZER, |
| 135 | .cond_mutex = PTHREAD_MUTEX_INITIALIZER, |
| 136 | }; |
| 137 | |
| 138 | /* Command line options */ |
| 139 | static const struct option long_options[] = { |
| 140 | { "client-sock", required_argument, 0, 'c' }, |
| 141 | { "apps-sock", required_argument, 0, 'a' }, |
| 142 | { "kconsumerd-cmd-sock", required_argument, 0, '\0' }, |
| 143 | { "kconsumerd-err-sock", required_argument, 0, '\0' }, |
| 144 | { "ustconsumerd32-cmd-sock", required_argument, 0, '\0' }, |
| 145 | { "ustconsumerd32-err-sock", required_argument, 0, '\0' }, |
| 146 | { "ustconsumerd64-cmd-sock", required_argument, 0, '\0' }, |
| 147 | { "ustconsumerd64-err-sock", required_argument, 0, '\0' }, |
| 148 | { "consumerd32-path", required_argument, 0, '\0' }, |
| 149 | { "consumerd32-libdir", required_argument, 0, '\0' }, |
| 150 | { "consumerd64-path", required_argument, 0, '\0' }, |
| 151 | { "consumerd64-libdir", required_argument, 0, '\0' }, |
| 152 | { "daemonize", no_argument, 0, 'd' }, |
| 153 | { "background", no_argument, 0, 'b' }, |
| 154 | { "sig-parent", no_argument, 0, 'S' }, |
| 155 | { "help", no_argument, 0, 'h' }, |
| 156 | { "group", required_argument, 0, 'g' }, |
| 157 | { "version", no_argument, 0, 'V' }, |
| 158 | { "quiet", no_argument, 0, 'q' }, |
| 159 | { "verbose", no_argument, 0, 'v' }, |
| 160 | { "verbose-consumer", no_argument, 0, '\0' }, |
| 161 | { "no-kernel", no_argument, 0, '\0' }, |
| 162 | { "pidfile", required_argument, 0, 'p' }, |
| 163 | { "agent-tcp-port", required_argument, 0, '\0' }, |
| 164 | { "config", required_argument, 0, 'f' }, |
| 165 | { "load", required_argument, 0, 'l' }, |
| 166 | { "kmod-probes", required_argument, 0, '\0' }, |
| 167 | { "extra-kmod-probes", required_argument, 0, '\0' }, |
| 168 | { NULL, 0, 0, 0 } |
| 169 | }; |
| 170 | |
| 171 | /* Command line options to ignore from configuration file */ |
| 172 | static const char *config_ignore_options[] = { "help", "version", "config" }; |
| 173 | |
| 174 | /* Shared between threads */ |
| 175 | static int dispatch_thread_exit; |
| 176 | |
| 177 | /* Sockets and FDs */ |
| 178 | static int client_sock = -1; |
| 179 | static int apps_sock = -1; |
| 180 | |
| 181 | /* |
| 182 | * This pipe is used to inform the thread managing application communication |
| 183 | * that a command is queued and ready to be processed. |
| 184 | */ |
| 185 | static int apps_cmd_pipe[2] = { -1, -1 }; |
| 186 | |
| 187 | /* Pthread, Mutexes and Semaphores */ |
| 188 | static pthread_t apps_thread; |
| 189 | static pthread_t apps_notify_thread; |
| 190 | static pthread_t reg_apps_thread; |
| 191 | static pthread_t client_thread; |
| 192 | static pthread_t kernel_thread; |
| 193 | static pthread_t dispatch_thread; |
| 194 | static pthread_t health_thread; |
| 195 | static pthread_t ht_cleanup_thread; |
| 196 | static pthread_t agent_reg_thread; |
| 197 | static pthread_t load_session_thread; |
| 198 | static pthread_t notification_thread; |
| 199 | static pthread_t rotation_thread; |
| 200 | static pthread_t timer_thread; |
| 201 | |
| 202 | /* |
| 203 | * UST registration command queue. This queue is tied with a futex and uses a N |
| 204 | * wakers / 1 waiter implemented and detailed in futex.c/.h |
| 205 | * |
| 206 | * The thread_registration_apps and thread_dispatch_ust_registration uses this |
| 207 | * queue along with the wait/wake scheme. The thread_manage_apps receives down |
| 208 | * the line new application socket and monitors it for any I/O error or clean |
| 209 | * close that triggers an unregistration of the application. |
| 210 | */ |
| 211 | static struct ust_cmd_queue ust_cmd_queue; |
| 212 | |
| 213 | static const char *module_proc_lttng = "/proc/lttng"; |
| 214 | |
| 215 | /* |
| 216 | * Consumer daemon state which is changed when spawning it, killing it or in |
| 217 | * case of a fatal error. |
| 218 | */ |
| 219 | enum consumerd_state { |
| 220 | CONSUMER_STARTED = 1, |
| 221 | CONSUMER_STOPPED = 2, |
| 222 | CONSUMER_ERROR = 3, |
| 223 | }; |
| 224 | |
| 225 | /* |
| 226 | * This consumer daemon state is used to validate if a client command will be |
| 227 | * able to reach the consumer. If not, the client is informed. For instance, |
| 228 | * doing a "lttng start" when the consumer state is set to ERROR will return an |
| 229 | * error to the client. |
| 230 | * |
| 231 | * The following example shows a possible race condition of this scheme: |
| 232 | * |
| 233 | * consumer thread error happens |
| 234 | * client cmd arrives |
| 235 | * client cmd checks state -> still OK |
| 236 | * consumer thread exit, sets error |
| 237 | * client cmd try to talk to consumer |
| 238 | * ... |
| 239 | * |
| 240 | * However, since the consumer is a different daemon, we have no way of making |
| 241 | * sure the command will reach it safely even with this state flag. This is why |
| 242 | * we consider that up to the state validation during command processing, the |
| 243 | * command is safe. After that, we can not guarantee the correctness of the |
| 244 | * client request vis-a-vis the consumer. |
| 245 | */ |
| 246 | static enum consumerd_state ust_consumerd_state; |
| 247 | static enum consumerd_state kernel_consumerd_state; |
| 248 | |
| 249 | /* Load session thread information to operate. */ |
| 250 | static struct load_session_thread_data *load_info; |
| 251 | |
| 252 | /* |
| 253 | * Section name to look for in the daemon configuration file. |
| 254 | */ |
| 255 | static const char * const config_section_name = "sessiond"; |
| 256 | |
| 257 | /* Am I root or not. Set to 1 if the daemon is running as root */ |
| 258 | static int is_root; |
| 259 | |
| 260 | /* Rotation thread handle. */ |
| 261 | static struct rotation_thread_handle *rotation_thread_handle; |
| 262 | |
| 263 | /* |
| 264 | * Stop all threads by closing the thread quit pipe. |
| 265 | */ |
| 266 | static void stop_threads(void) |
| 267 | { |
| 268 | int ret; |
| 269 | |
| 270 | /* Stopping all threads */ |
| 271 | DBG("Terminating all threads"); |
| 272 | ret = sessiond_notify_quit_pipe(); |
| 273 | if (ret < 0) { |
| 274 | ERR("write error on thread quit pipe"); |
| 275 | } |
| 276 | |
| 277 | /* Dispatch thread */ |
| 278 | CMM_STORE_SHARED(dispatch_thread_exit, 1); |
| 279 | futex_nto1_wake(&ust_cmd_queue.futex); |
| 280 | } |
| 281 | |
| 282 | /* |
| 283 | * Close every consumer sockets. |
| 284 | */ |
| 285 | static void close_consumer_sockets(void) |
| 286 | { |
| 287 | int ret; |
| 288 | |
| 289 | if (kconsumer_data.err_sock >= 0) { |
| 290 | ret = close(kconsumer_data.err_sock); |
| 291 | if (ret < 0) { |
| 292 | PERROR("kernel consumer err_sock close"); |
| 293 | } |
| 294 | } |
| 295 | if (ustconsumer32_data.err_sock >= 0) { |
| 296 | ret = close(ustconsumer32_data.err_sock); |
| 297 | if (ret < 0) { |
| 298 | PERROR("UST consumerd32 err_sock close"); |
| 299 | } |
| 300 | } |
| 301 | if (ustconsumer64_data.err_sock >= 0) { |
| 302 | ret = close(ustconsumer64_data.err_sock); |
| 303 | if (ret < 0) { |
| 304 | PERROR("UST consumerd64 err_sock close"); |
| 305 | } |
| 306 | } |
| 307 | if (kconsumer_data.cmd_sock >= 0) { |
| 308 | ret = close(kconsumer_data.cmd_sock); |
| 309 | if (ret < 0) { |
| 310 | PERROR("kernel consumer cmd_sock close"); |
| 311 | } |
| 312 | } |
| 313 | if (ustconsumer32_data.cmd_sock >= 0) { |
| 314 | ret = close(ustconsumer32_data.cmd_sock); |
| 315 | if (ret < 0) { |
| 316 | PERROR("UST consumerd32 cmd_sock close"); |
| 317 | } |
| 318 | } |
| 319 | if (ustconsumer64_data.cmd_sock >= 0) { |
| 320 | ret = close(ustconsumer64_data.cmd_sock); |
| 321 | if (ret < 0) { |
| 322 | PERROR("UST consumerd64 cmd_sock close"); |
| 323 | } |
| 324 | } |
| 325 | if (kconsumer_data.channel_monitor_pipe >= 0) { |
| 326 | ret = close(kconsumer_data.channel_monitor_pipe); |
| 327 | if (ret < 0) { |
| 328 | PERROR("kernel consumer channel monitor pipe close"); |
| 329 | } |
| 330 | } |
| 331 | if (ustconsumer32_data.channel_monitor_pipe >= 0) { |
| 332 | ret = close(ustconsumer32_data.channel_monitor_pipe); |
| 333 | if (ret < 0) { |
| 334 | PERROR("UST consumerd32 channel monitor pipe close"); |
| 335 | } |
| 336 | } |
| 337 | if (ustconsumer64_data.channel_monitor_pipe >= 0) { |
| 338 | ret = close(ustconsumer64_data.channel_monitor_pipe); |
| 339 | if (ret < 0) { |
| 340 | PERROR("UST consumerd64 channel monitor pipe close"); |
| 341 | } |
| 342 | } |
| 343 | } |
| 344 | |
| 345 | /* |
| 346 | * Wait on consumer process termination. |
| 347 | * |
| 348 | * Need to be called with the consumer data lock held or from a context |
| 349 | * ensuring no concurrent access to data (e.g: cleanup). |
| 350 | */ |
| 351 | static void wait_consumer(struct consumer_data *consumer_data) |
| 352 | { |
| 353 | pid_t ret; |
| 354 | int status; |
| 355 | |
| 356 | if (consumer_data->pid <= 0) { |
| 357 | return; |
| 358 | } |
| 359 | |
| 360 | DBG("Waiting for complete teardown of consumerd (PID: %d)", |
| 361 | consumer_data->pid); |
| 362 | ret = waitpid(consumer_data->pid, &status, 0); |
| 363 | if (ret == -1) { |
| 364 | PERROR("consumerd waitpid pid: %d", consumer_data->pid) |
| 365 | } else if (!WIFEXITED(status)) { |
| 366 | ERR("consumerd termination with error: %d", |
| 367 | WEXITSTATUS(ret)); |
| 368 | } |
| 369 | consumer_data->pid = 0; |
| 370 | } |
| 371 | |
| 372 | /* |
| 373 | * Cleanup the session daemon's data structures. |
| 374 | */ |
| 375 | static void sessiond_cleanup(void) |
| 376 | { |
| 377 | int ret; |
| 378 | struct ltt_session_list *session_list = session_get_list(); |
| 379 | |
| 380 | DBG("Cleanup sessiond"); |
| 381 | |
| 382 | /* |
| 383 | * Close the thread quit pipe. It has already done its job, |
| 384 | * since we are now called. |
| 385 | */ |
| 386 | sessiond_close_quit_pipe(); |
| 387 | |
| 388 | ret = remove(config.pid_file_path.value); |
| 389 | if (ret < 0) { |
| 390 | PERROR("remove pidfile %s", config.pid_file_path.value); |
| 391 | } |
| 392 | |
| 393 | DBG("Removing sessiond and consumerd content of directory %s", |
| 394 | config.rundir.value); |
| 395 | |
| 396 | /* sessiond */ |
| 397 | DBG("Removing %s", config.pid_file_path.value); |
| 398 | (void) unlink(config.pid_file_path.value); |
| 399 | |
| 400 | DBG("Removing %s", config.agent_port_file_path.value); |
| 401 | (void) unlink(config.agent_port_file_path.value); |
| 402 | |
| 403 | /* kconsumerd */ |
| 404 | DBG("Removing %s", kconsumer_data.err_unix_sock_path); |
| 405 | (void) unlink(kconsumer_data.err_unix_sock_path); |
| 406 | |
| 407 | DBG("Removing directory %s", config.kconsumerd_path.value); |
| 408 | (void) rmdir(config.kconsumerd_path.value); |
| 409 | |
| 410 | /* ust consumerd 32 */ |
| 411 | DBG("Removing %s", config.consumerd32_err_unix_sock_path.value); |
| 412 | (void) unlink(config.consumerd32_err_unix_sock_path.value); |
| 413 | |
| 414 | DBG("Removing directory %s", config.consumerd32_path.value); |
| 415 | (void) rmdir(config.consumerd32_path.value); |
| 416 | |
| 417 | /* ust consumerd 64 */ |
| 418 | DBG("Removing %s", config.consumerd64_err_unix_sock_path.value); |
| 419 | (void) unlink(config.consumerd64_err_unix_sock_path.value); |
| 420 | |
| 421 | DBG("Removing directory %s", config.consumerd64_path.value); |
| 422 | (void) rmdir(config.consumerd64_path.value); |
| 423 | |
| 424 | pthread_mutex_destroy(&session_list->lock); |
| 425 | |
| 426 | wait_consumer(&kconsumer_data); |
| 427 | wait_consumer(&ustconsumer64_data); |
| 428 | wait_consumer(&ustconsumer32_data); |
| 429 | |
| 430 | DBG("Cleaning up all agent apps"); |
| 431 | agent_app_ht_clean(); |
| 432 | |
| 433 | DBG("Closing all UST sockets"); |
| 434 | ust_app_clean_list(); |
| 435 | buffer_reg_destroy_registries(); |
| 436 | |
| 437 | if (is_root && !config.no_kernel) { |
| 438 | DBG2("Closing kernel fd"); |
| 439 | if (kernel_tracer_fd >= 0) { |
| 440 | ret = close(kernel_tracer_fd); |
| 441 | if (ret) { |
| 442 | PERROR("close"); |
| 443 | } |
| 444 | } |
| 445 | DBG("Unloading kernel modules"); |
| 446 | modprobe_remove_lttng_all(); |
| 447 | free(syscall_table); |
| 448 | } |
| 449 | |
| 450 | close_consumer_sockets(); |
| 451 | |
| 452 | if (load_info) { |
| 453 | load_session_destroy_data(load_info); |
| 454 | free(load_info); |
| 455 | } |
| 456 | |
| 457 | /* |
| 458 | * We do NOT rmdir rundir because there are other processes |
| 459 | * using it, for instance lttng-relayd, which can start in |
| 460 | * parallel with this teardown. |
| 461 | */ |
| 462 | } |
| 463 | |
| 464 | /* |
| 465 | * Cleanup the daemon's option data structures. |
| 466 | */ |
| 467 | static void sessiond_cleanup_options(void) |
| 468 | { |
| 469 | DBG("Cleaning up options"); |
| 470 | |
| 471 | sessiond_config_fini(&config); |
| 472 | |
| 473 | run_as_destroy_worker(); |
| 474 | } |
| 475 | |
| 476 | /* |
| 477 | * Send data on a unix socket using the liblttsessiondcomm API. |
| 478 | * |
| 479 | * Return lttcomm error code. |
| 480 | */ |
| 481 | static int send_unix_sock(int sock, void *buf, size_t len) |
| 482 | { |
| 483 | /* Check valid length */ |
| 484 | if (len == 0) { |
| 485 | return -1; |
| 486 | } |
| 487 | |
| 488 | return lttcomm_send_unix_sock(sock, buf, len); |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * Free memory of a command context structure. |
| 493 | */ |
| 494 | static void clean_command_ctx(struct command_ctx **cmd_ctx) |
| 495 | { |
| 496 | DBG("Clean command context structure"); |
| 497 | if (*cmd_ctx) { |
| 498 | if ((*cmd_ctx)->llm) { |
| 499 | free((*cmd_ctx)->llm); |
| 500 | } |
| 501 | if ((*cmd_ctx)->lsm) { |
| 502 | free((*cmd_ctx)->lsm); |
| 503 | } |
| 504 | free(*cmd_ctx); |
| 505 | *cmd_ctx = NULL; |
| 506 | } |
| 507 | } |
| 508 | |
| 509 | /* |
| 510 | * Notify UST applications using the shm mmap futex. |
| 511 | */ |
| 512 | static int notify_ust_apps(int active) |
| 513 | { |
| 514 | char *wait_shm_mmap; |
| 515 | |
| 516 | DBG("Notifying applications of session daemon state: %d", active); |
| 517 | |
| 518 | /* See shm.c for this call implying mmap, shm and futex calls */ |
| 519 | wait_shm_mmap = shm_ust_get_mmap(config.wait_shm_path.value, is_root); |
| 520 | if (wait_shm_mmap == NULL) { |
| 521 | goto error; |
| 522 | } |
| 523 | |
| 524 | /* Wake waiting process */ |
| 525 | futex_wait_update((int32_t *) wait_shm_mmap, active); |
| 526 | |
| 527 | /* Apps notified successfully */ |
| 528 | return 0; |
| 529 | |
| 530 | error: |
| 531 | return -1; |
| 532 | } |
| 533 | |
| 534 | /* |
| 535 | * Setup the outgoing data buffer for the response (llm) by allocating the |
| 536 | * right amount of memory and copying the original information from the lsm |
| 537 | * structure. |
| 538 | * |
| 539 | * Return 0 on success, negative value on error. |
| 540 | */ |
| 541 | static int setup_lttng_msg(struct command_ctx *cmd_ctx, |
| 542 | const void *payload_buf, size_t payload_len, |
| 543 | const void *cmd_header_buf, size_t cmd_header_len) |
| 544 | { |
| 545 | int ret = 0; |
| 546 | const size_t header_len = sizeof(struct lttcomm_lttng_msg); |
| 547 | const size_t cmd_header_offset = header_len; |
| 548 | const size_t payload_offset = cmd_header_offset + cmd_header_len; |
| 549 | const size_t total_msg_size = header_len + cmd_header_len + payload_len; |
| 550 | |
| 551 | cmd_ctx->llm = zmalloc(total_msg_size); |
| 552 | |
| 553 | if (cmd_ctx->llm == NULL) { |
| 554 | PERROR("zmalloc"); |
| 555 | ret = -ENOMEM; |
| 556 | goto end; |
| 557 | } |
| 558 | |
| 559 | /* Copy common data */ |
| 560 | cmd_ctx->llm->cmd_type = cmd_ctx->lsm->cmd_type; |
| 561 | cmd_ctx->llm->pid = cmd_ctx->lsm->domain.attr.pid; |
| 562 | cmd_ctx->llm->cmd_header_size = cmd_header_len; |
| 563 | cmd_ctx->llm->data_size = payload_len; |
| 564 | cmd_ctx->lttng_msg_size = total_msg_size; |
| 565 | |
| 566 | /* Copy command header */ |
| 567 | if (cmd_header_len) { |
| 568 | memcpy(((uint8_t *) cmd_ctx->llm) + cmd_header_offset, cmd_header_buf, |
| 569 | cmd_header_len); |
| 570 | } |
| 571 | |
| 572 | /* Copy payload */ |
| 573 | if (payload_len) { |
| 574 | memcpy(((uint8_t *) cmd_ctx->llm) + payload_offset, payload_buf, |
| 575 | payload_len); |
| 576 | } |
| 577 | |
| 578 | end: |
| 579 | return ret; |
| 580 | } |
| 581 | |
| 582 | /* |
| 583 | * Version of setup_lttng_msg() without command header. |
| 584 | */ |
| 585 | static int setup_lttng_msg_no_cmd_header(struct command_ctx *cmd_ctx, |
| 586 | void *payload_buf, size_t payload_len) |
| 587 | { |
| 588 | return setup_lttng_msg(cmd_ctx, payload_buf, payload_len, NULL, 0); |
| 589 | } |
| 590 | /* |
| 591 | * Update the kernel poll set of all channel fd available over all tracing |
| 592 | * session. Add the wakeup pipe at the end of the set. |
| 593 | */ |
| 594 | static int update_kernel_poll(struct lttng_poll_event *events) |
| 595 | { |
| 596 | int ret; |
| 597 | struct ltt_kernel_channel *channel; |
| 598 | struct ltt_session *session; |
| 599 | const struct ltt_session_list *session_list = session_get_list(); |
| 600 | |
| 601 | DBG("Updating kernel poll set"); |
| 602 | |
| 603 | session_lock_list(); |
| 604 | cds_list_for_each_entry(session, &session_list->head, list) { |
| 605 | if (!session_get(session)) { |
| 606 | continue; |
| 607 | } |
| 608 | session_lock(session); |
| 609 | if (session->kernel_session == NULL) { |
| 610 | session_unlock(session); |
| 611 | session_put(session); |
| 612 | continue; |
| 613 | } |
| 614 | |
| 615 | cds_list_for_each_entry(channel, |
| 616 | &session->kernel_session->channel_list.head, list) { |
| 617 | /* Add channel fd to the kernel poll set */ |
| 618 | ret = lttng_poll_add(events, channel->fd, LPOLLIN | LPOLLRDNORM); |
| 619 | if (ret < 0) { |
| 620 | session_unlock(session); |
| 621 | session_put(session); |
| 622 | goto error; |
| 623 | } |
| 624 | DBG("Channel fd %d added to kernel set", channel->fd); |
| 625 | } |
| 626 | session_unlock(session); |
| 627 | } |
| 628 | session_unlock_list(); |
| 629 | |
| 630 | return 0; |
| 631 | |
| 632 | error: |
| 633 | session_unlock_list(); |
| 634 | return -1; |
| 635 | } |
| 636 | |
| 637 | /* |
| 638 | * Find the channel fd from 'fd' over all tracing session. When found, check |
| 639 | * for new channel stream and send those stream fds to the kernel consumer. |
| 640 | * |
| 641 | * Useful for CPU hotplug feature. |
| 642 | */ |
| 643 | static int update_kernel_stream(int fd) |
| 644 | { |
| 645 | int ret = 0; |
| 646 | struct ltt_session *session; |
| 647 | struct ltt_kernel_session *ksess; |
| 648 | struct ltt_kernel_channel *channel; |
| 649 | const struct ltt_session_list *session_list = session_get_list(); |
| 650 | |
| 651 | DBG("Updating kernel streams for channel fd %d", fd); |
| 652 | |
| 653 | session_lock_list(); |
| 654 | cds_list_for_each_entry(session, &session_list->head, list) { |
| 655 | if (!session_get(session)) { |
| 656 | continue; |
| 657 | } |
| 658 | session_lock(session); |
| 659 | if (session->kernel_session == NULL) { |
| 660 | session_unlock(session); |
| 661 | session_put(session); |
| 662 | continue; |
| 663 | } |
| 664 | ksess = session->kernel_session; |
| 665 | |
| 666 | cds_list_for_each_entry(channel, |
| 667 | &ksess->channel_list.head, list) { |
| 668 | struct lttng_ht_iter iter; |
| 669 | struct consumer_socket *socket; |
| 670 | |
| 671 | if (channel->fd != fd) { |
| 672 | continue; |
| 673 | } |
| 674 | DBG("Channel found, updating kernel streams"); |
| 675 | ret = kernel_open_channel_stream(channel); |
| 676 | if (ret < 0) { |
| 677 | goto error; |
| 678 | } |
| 679 | /* Update the stream global counter */ |
| 680 | ksess->stream_count_global += ret; |
| 681 | |
| 682 | /* |
| 683 | * Have we already sent fds to the consumer? If yes, it |
| 684 | * means that tracing is started so it is safe to send |
| 685 | * our updated stream fds. |
| 686 | */ |
| 687 | if (ksess->consumer_fds_sent != 1 |
| 688 | || ksess->consumer == NULL) { |
| 689 | ret = -1; |
| 690 | goto error; |
| 691 | } |
| 692 | |
| 693 | rcu_read_lock(); |
| 694 | cds_lfht_for_each_entry(ksess->consumer->socks->ht, |
| 695 | &iter.iter, socket, node.node) { |
| 696 | pthread_mutex_lock(socket->lock); |
| 697 | ret = kernel_consumer_send_channel_streams(socket, |
| 698 | channel, ksess, |
| 699 | session->output_traces ? 1 : 0); |
| 700 | pthread_mutex_unlock(socket->lock); |
| 701 | if (ret < 0) { |
| 702 | rcu_read_unlock(); |
| 703 | goto error; |
| 704 | } |
| 705 | } |
| 706 | rcu_read_unlock(); |
| 707 | } |
| 708 | session_unlock(session); |
| 709 | session_put(session); |
| 710 | } |
| 711 | session_unlock_list(); |
| 712 | return ret; |
| 713 | |
| 714 | error: |
| 715 | session_unlock(session); |
| 716 | session_put(session); |
| 717 | session_unlock_list(); |
| 718 | return ret; |
| 719 | } |
| 720 | |
| 721 | /* |
| 722 | * For each tracing session, update newly registered apps. The session list |
| 723 | * lock MUST be acquired before calling this. |
| 724 | */ |
| 725 | static void update_ust_app(int app_sock) |
| 726 | { |
| 727 | struct ltt_session *sess, *stmp; |
| 728 | const struct ltt_session_list *session_list = session_get_list(); |
| 729 | |
| 730 | /* Consumer is in an ERROR state. Stop any application update. */ |
| 731 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { |
| 732 | /* Stop the update process since the consumer is dead. */ |
| 733 | return; |
| 734 | } |
| 735 | |
| 736 | /* For all tracing session(s) */ |
| 737 | cds_list_for_each_entry_safe(sess, stmp, &session_list->head, list) { |
| 738 | struct ust_app *app; |
| 739 | |
| 740 | if (!session_get(sess)) { |
| 741 | continue; |
| 742 | } |
| 743 | session_lock(sess); |
| 744 | if (!sess->ust_session) { |
| 745 | goto unlock_session; |
| 746 | } |
| 747 | |
| 748 | rcu_read_lock(); |
| 749 | assert(app_sock >= 0); |
| 750 | app = ust_app_find_by_sock(app_sock); |
| 751 | if (app == NULL) { |
| 752 | /* |
| 753 | * Application can be unregistered before so |
| 754 | * this is possible hence simply stopping the |
| 755 | * update. |
| 756 | */ |
| 757 | DBG3("UST app update failed to find app sock %d", |
| 758 | app_sock); |
| 759 | goto unlock_rcu; |
| 760 | } |
| 761 | ust_app_global_update(sess->ust_session, app); |
| 762 | unlock_rcu: |
| 763 | rcu_read_unlock(); |
| 764 | unlock_session: |
| 765 | session_unlock(sess); |
| 766 | session_put(sess); |
| 767 | } |
| 768 | } |
| 769 | |
| 770 | /* |
| 771 | * This thread manage event coming from the kernel. |
| 772 | * |
| 773 | * Features supported in this thread: |
| 774 | * -) CPU Hotplug |
| 775 | */ |
| 776 | static void *thread_manage_kernel(void *data) |
| 777 | { |
| 778 | int ret, i, pollfd, update_poll_flag = 1, err = -1; |
| 779 | uint32_t revents, nb_fd; |
| 780 | char tmp; |
| 781 | struct lttng_poll_event events; |
| 782 | |
| 783 | DBG("[thread] Thread manage kernel started"); |
| 784 | |
| 785 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_KERNEL); |
| 786 | |
| 787 | /* |
| 788 | * This first step of the while is to clean this structure which could free |
| 789 | * non NULL pointers so initialize it before the loop. |
| 790 | */ |
| 791 | lttng_poll_init(&events); |
| 792 | |
| 793 | if (testpoint(sessiond_thread_manage_kernel)) { |
| 794 | goto error_testpoint; |
| 795 | } |
| 796 | |
| 797 | health_code_update(); |
| 798 | |
| 799 | if (testpoint(sessiond_thread_manage_kernel_before_loop)) { |
| 800 | goto error_testpoint; |
| 801 | } |
| 802 | |
| 803 | while (1) { |
| 804 | health_code_update(); |
| 805 | |
| 806 | if (update_poll_flag == 1) { |
| 807 | /* Clean events object. We are about to populate it again. */ |
| 808 | lttng_poll_clean(&events); |
| 809 | |
| 810 | ret = sessiond_set_thread_pollset(&events, 2); |
| 811 | if (ret < 0) { |
| 812 | goto error_poll_create; |
| 813 | } |
| 814 | |
| 815 | ret = lttng_poll_add(&events, kernel_poll_pipe[0], LPOLLIN); |
| 816 | if (ret < 0) { |
| 817 | goto error; |
| 818 | } |
| 819 | |
| 820 | /* This will add the available kernel channel if any. */ |
| 821 | ret = update_kernel_poll(&events); |
| 822 | if (ret < 0) { |
| 823 | goto error; |
| 824 | } |
| 825 | update_poll_flag = 0; |
| 826 | } |
| 827 | |
| 828 | DBG("Thread kernel polling"); |
| 829 | |
| 830 | /* Poll infinite value of time */ |
| 831 | restart: |
| 832 | health_poll_entry(); |
| 833 | ret = lttng_poll_wait(&events, -1); |
| 834 | DBG("Thread kernel return from poll on %d fds", |
| 835 | LTTNG_POLL_GETNB(&events)); |
| 836 | health_poll_exit(); |
| 837 | if (ret < 0) { |
| 838 | /* |
| 839 | * Restart interrupted system call. |
| 840 | */ |
| 841 | if (errno == EINTR) { |
| 842 | goto restart; |
| 843 | } |
| 844 | goto error; |
| 845 | } else if (ret == 0) { |
| 846 | /* Should not happen since timeout is infinite */ |
| 847 | ERR("Return value of poll is 0 with an infinite timeout.\n" |
| 848 | "This should not have happened! Continuing..."); |
| 849 | continue; |
| 850 | } |
| 851 | |
| 852 | nb_fd = ret; |
| 853 | |
| 854 | for (i = 0; i < nb_fd; i++) { |
| 855 | /* Fetch once the poll data */ |
| 856 | revents = LTTNG_POLL_GETEV(&events, i); |
| 857 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 858 | |
| 859 | health_code_update(); |
| 860 | |
| 861 | if (!revents) { |
| 862 | /* No activity for this FD (poll implementation). */ |
| 863 | continue; |
| 864 | } |
| 865 | |
| 866 | /* Thread quit pipe has been closed. Killing thread. */ |
| 867 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
| 868 | if (ret) { |
| 869 | err = 0; |
| 870 | goto exit; |
| 871 | } |
| 872 | |
| 873 | /* Check for data on kernel pipe */ |
| 874 | if (revents & LPOLLIN) { |
| 875 | if (pollfd == kernel_poll_pipe[0]) { |
| 876 | (void) lttng_read(kernel_poll_pipe[0], |
| 877 | &tmp, 1); |
| 878 | /* |
| 879 | * Ret value is useless here, if this pipe gets any actions an |
| 880 | * update is required anyway. |
| 881 | */ |
| 882 | update_poll_flag = 1; |
| 883 | continue; |
| 884 | } else { |
| 885 | /* |
| 886 | * New CPU detected by the kernel. Adding kernel stream to |
| 887 | * kernel session and updating the kernel consumer |
| 888 | */ |
| 889 | ret = update_kernel_stream(pollfd); |
| 890 | if (ret < 0) { |
| 891 | continue; |
| 892 | } |
| 893 | break; |
| 894 | } |
| 895 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 896 | update_poll_flag = 1; |
| 897 | continue; |
| 898 | } else { |
| 899 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); |
| 900 | goto error; |
| 901 | } |
| 902 | } |
| 903 | } |
| 904 | |
| 905 | exit: |
| 906 | error: |
| 907 | lttng_poll_clean(&events); |
| 908 | error_poll_create: |
| 909 | error_testpoint: |
| 910 | utils_close_pipe(kernel_poll_pipe); |
| 911 | kernel_poll_pipe[0] = kernel_poll_pipe[1] = -1; |
| 912 | if (err) { |
| 913 | health_error(); |
| 914 | ERR("Health error occurred in %s", __func__); |
| 915 | WARN("Kernel thread died unexpectedly. " |
| 916 | "Kernel tracing can continue but CPU hotplug is disabled."); |
| 917 | } |
| 918 | health_unregister(health_sessiond); |
| 919 | DBG("Kernel thread dying"); |
| 920 | return NULL; |
| 921 | } |
| 922 | |
| 923 | /* |
| 924 | * Signal pthread condition of the consumer data that the thread. |
| 925 | */ |
| 926 | static void signal_consumer_condition(struct consumer_data *data, int state) |
| 927 | { |
| 928 | pthread_mutex_lock(&data->cond_mutex); |
| 929 | |
| 930 | /* |
| 931 | * The state is set before signaling. It can be any value, it's the waiter |
| 932 | * job to correctly interpret this condition variable associated to the |
| 933 | * consumer pthread_cond. |
| 934 | * |
| 935 | * A value of 0 means that the corresponding thread of the consumer data |
| 936 | * was not started. 1 indicates that the thread has started and is ready |
| 937 | * for action. A negative value means that there was an error during the |
| 938 | * thread bootstrap. |
| 939 | */ |
| 940 | data->consumer_thread_is_ready = state; |
| 941 | (void) pthread_cond_signal(&data->cond); |
| 942 | |
| 943 | pthread_mutex_unlock(&data->cond_mutex); |
| 944 | } |
| 945 | |
| 946 | /* |
| 947 | * This thread manage the consumer error sent back to the session daemon. |
| 948 | */ |
| 949 | static void *thread_manage_consumer(void *data) |
| 950 | { |
| 951 | int sock = -1, i, ret, pollfd, err = -1, should_quit = 0; |
| 952 | uint32_t revents, nb_fd; |
| 953 | enum lttcomm_return_code code; |
| 954 | struct lttng_poll_event events; |
| 955 | struct consumer_data *consumer_data = data; |
| 956 | struct consumer_socket *cmd_socket_wrapper = NULL; |
| 957 | |
| 958 | DBG("[thread] Manage consumer started"); |
| 959 | |
| 960 | rcu_register_thread(); |
| 961 | rcu_thread_online(); |
| 962 | |
| 963 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CONSUMER); |
| 964 | |
| 965 | health_code_update(); |
| 966 | |
| 967 | /* |
| 968 | * Pass 3 as size here for the thread quit pipe, consumerd_err_sock and the |
| 969 | * metadata_sock. Nothing more will be added to this poll set. |
| 970 | */ |
| 971 | ret = sessiond_set_thread_pollset(&events, 3); |
| 972 | if (ret < 0) { |
| 973 | goto error_poll; |
| 974 | } |
| 975 | |
| 976 | /* |
| 977 | * The error socket here is already in a listening state which was done |
| 978 | * just before spawning this thread to avoid a race between the consumer |
| 979 | * daemon exec trying to connect and the listen() call. |
| 980 | */ |
| 981 | ret = lttng_poll_add(&events, consumer_data->err_sock, LPOLLIN | LPOLLRDHUP); |
| 982 | if (ret < 0) { |
| 983 | goto error; |
| 984 | } |
| 985 | |
| 986 | health_code_update(); |
| 987 | |
| 988 | /* Infinite blocking call, waiting for transmission */ |
| 989 | restart: |
| 990 | health_poll_entry(); |
| 991 | |
| 992 | if (testpoint(sessiond_thread_manage_consumer)) { |
| 993 | goto error; |
| 994 | } |
| 995 | |
| 996 | ret = lttng_poll_wait(&events, -1); |
| 997 | health_poll_exit(); |
| 998 | if (ret < 0) { |
| 999 | /* |
| 1000 | * Restart interrupted system call. |
| 1001 | */ |
| 1002 | if (errno == EINTR) { |
| 1003 | goto restart; |
| 1004 | } |
| 1005 | goto error; |
| 1006 | } |
| 1007 | |
| 1008 | nb_fd = ret; |
| 1009 | |
| 1010 | for (i = 0; i < nb_fd; i++) { |
| 1011 | /* Fetch once the poll data */ |
| 1012 | revents = LTTNG_POLL_GETEV(&events, i); |
| 1013 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 1014 | |
| 1015 | health_code_update(); |
| 1016 | |
| 1017 | if (!revents) { |
| 1018 | /* No activity for this FD (poll implementation). */ |
| 1019 | continue; |
| 1020 | } |
| 1021 | |
| 1022 | /* Thread quit pipe has been closed. Killing thread. */ |
| 1023 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
| 1024 | if (ret) { |
| 1025 | err = 0; |
| 1026 | goto exit; |
| 1027 | } |
| 1028 | |
| 1029 | /* Event on the registration socket */ |
| 1030 | if (pollfd == consumer_data->err_sock) { |
| 1031 | if (revents & LPOLLIN) { |
| 1032 | continue; |
| 1033 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 1034 | ERR("consumer err socket poll error"); |
| 1035 | goto error; |
| 1036 | } else { |
| 1037 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); |
| 1038 | goto error; |
| 1039 | } |
| 1040 | } |
| 1041 | } |
| 1042 | |
| 1043 | sock = lttcomm_accept_unix_sock(consumer_data->err_sock); |
| 1044 | if (sock < 0) { |
| 1045 | goto error; |
| 1046 | } |
| 1047 | |
| 1048 | /* |
| 1049 | * Set the CLOEXEC flag. Return code is useless because either way, the |
| 1050 | * show must go on. |
| 1051 | */ |
| 1052 | (void) utils_set_fd_cloexec(sock); |
| 1053 | |
| 1054 | health_code_update(); |
| 1055 | |
| 1056 | DBG2("Receiving code from consumer err_sock"); |
| 1057 | |
| 1058 | /* Getting status code from kconsumerd */ |
| 1059 | ret = lttcomm_recv_unix_sock(sock, &code, |
| 1060 | sizeof(enum lttcomm_return_code)); |
| 1061 | if (ret <= 0) { |
| 1062 | goto error; |
| 1063 | } |
| 1064 | |
| 1065 | health_code_update(); |
| 1066 | if (code != LTTCOMM_CONSUMERD_COMMAND_SOCK_READY) { |
| 1067 | ERR("consumer error when waiting for SOCK_READY : %s", |
| 1068 | lttcomm_get_readable_code(-code)); |
| 1069 | goto error; |
| 1070 | } |
| 1071 | |
| 1072 | /* Connect both command and metadata sockets. */ |
| 1073 | consumer_data->cmd_sock = |
| 1074 | lttcomm_connect_unix_sock( |
| 1075 | consumer_data->cmd_unix_sock_path); |
| 1076 | consumer_data->metadata_fd = |
| 1077 | lttcomm_connect_unix_sock( |
| 1078 | consumer_data->cmd_unix_sock_path); |
| 1079 | if (consumer_data->cmd_sock < 0 || consumer_data->metadata_fd < 0) { |
| 1080 | PERROR("consumer connect cmd socket"); |
| 1081 | /* On error, signal condition and quit. */ |
| 1082 | signal_consumer_condition(consumer_data, -1); |
| 1083 | goto error; |
| 1084 | } |
| 1085 | |
| 1086 | consumer_data->metadata_sock.fd_ptr = &consumer_data->metadata_fd; |
| 1087 | |
| 1088 | /* Create metadata socket lock. */ |
| 1089 | consumer_data->metadata_sock.lock = zmalloc(sizeof(pthread_mutex_t)); |
| 1090 | if (consumer_data->metadata_sock.lock == NULL) { |
| 1091 | PERROR("zmalloc pthread mutex"); |
| 1092 | goto error; |
| 1093 | } |
| 1094 | pthread_mutex_init(consumer_data->metadata_sock.lock, NULL); |
| 1095 | |
| 1096 | DBG("Consumer command socket ready (fd: %d", consumer_data->cmd_sock); |
| 1097 | DBG("Consumer metadata socket ready (fd: %d)", |
| 1098 | consumer_data->metadata_fd); |
| 1099 | |
| 1100 | /* |
| 1101 | * Remove the consumerd error sock since we've established a connection. |
| 1102 | */ |
| 1103 | ret = lttng_poll_del(&events, consumer_data->err_sock); |
| 1104 | if (ret < 0) { |
| 1105 | goto error; |
| 1106 | } |
| 1107 | |
| 1108 | /* Add new accepted error socket. */ |
| 1109 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLRDHUP); |
| 1110 | if (ret < 0) { |
| 1111 | goto error; |
| 1112 | } |
| 1113 | |
| 1114 | /* Add metadata socket that is successfully connected. */ |
| 1115 | ret = lttng_poll_add(&events, consumer_data->metadata_fd, |
| 1116 | LPOLLIN | LPOLLRDHUP); |
| 1117 | if (ret < 0) { |
| 1118 | goto error; |
| 1119 | } |
| 1120 | |
| 1121 | health_code_update(); |
| 1122 | |
| 1123 | /* |
| 1124 | * Transfer the write-end of the channel monitoring and rotate pipe |
| 1125 | * to the consumer by issuing a SET_CHANNEL_MONITOR_PIPE command. |
| 1126 | */ |
| 1127 | cmd_socket_wrapper = consumer_allocate_socket(&consumer_data->cmd_sock); |
| 1128 | if (!cmd_socket_wrapper) { |
| 1129 | goto error; |
| 1130 | } |
| 1131 | cmd_socket_wrapper->lock = &consumer_data->lock; |
| 1132 | |
| 1133 | ret = consumer_send_channel_monitor_pipe(cmd_socket_wrapper, |
| 1134 | consumer_data->channel_monitor_pipe); |
| 1135 | if (ret) { |
| 1136 | goto error; |
| 1137 | } |
| 1138 | |
| 1139 | /* Discard the socket wrapper as it is no longer needed. */ |
| 1140 | consumer_destroy_socket(cmd_socket_wrapper); |
| 1141 | cmd_socket_wrapper = NULL; |
| 1142 | |
| 1143 | /* The thread is completely initialized, signal that it is ready. */ |
| 1144 | signal_consumer_condition(consumer_data, 1); |
| 1145 | |
| 1146 | /* Infinite blocking call, waiting for transmission */ |
| 1147 | restart_poll: |
| 1148 | while (1) { |
| 1149 | health_code_update(); |
| 1150 | |
| 1151 | /* Exit the thread because the thread quit pipe has been triggered. */ |
| 1152 | if (should_quit) { |
| 1153 | /* Not a health error. */ |
| 1154 | err = 0; |
| 1155 | goto exit; |
| 1156 | } |
| 1157 | |
| 1158 | health_poll_entry(); |
| 1159 | ret = lttng_poll_wait(&events, -1); |
| 1160 | health_poll_exit(); |
| 1161 | if (ret < 0) { |
| 1162 | /* |
| 1163 | * Restart interrupted system call. |
| 1164 | */ |
| 1165 | if (errno == EINTR) { |
| 1166 | goto restart_poll; |
| 1167 | } |
| 1168 | goto error; |
| 1169 | } |
| 1170 | |
| 1171 | nb_fd = ret; |
| 1172 | |
| 1173 | for (i = 0; i < nb_fd; i++) { |
| 1174 | /* Fetch once the poll data */ |
| 1175 | revents = LTTNG_POLL_GETEV(&events, i); |
| 1176 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 1177 | |
| 1178 | health_code_update(); |
| 1179 | |
| 1180 | if (!revents) { |
| 1181 | /* No activity for this FD (poll implementation). */ |
| 1182 | continue; |
| 1183 | } |
| 1184 | |
| 1185 | /* |
| 1186 | * Thread quit pipe has been triggered, flag that we should stop |
| 1187 | * but continue the current loop to handle potential data from |
| 1188 | * consumer. |
| 1189 | */ |
| 1190 | should_quit = sessiond_check_thread_quit_pipe(pollfd, revents); |
| 1191 | |
| 1192 | if (pollfd == sock) { |
| 1193 | /* Event on the consumerd socket */ |
| 1194 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
| 1195 | && !(revents & LPOLLIN)) { |
| 1196 | ERR("consumer err socket second poll error"); |
| 1197 | goto error; |
| 1198 | } |
| 1199 | health_code_update(); |
| 1200 | /* Wait for any kconsumerd error */ |
| 1201 | ret = lttcomm_recv_unix_sock(sock, &code, |
| 1202 | sizeof(enum lttcomm_return_code)); |
| 1203 | if (ret <= 0) { |
| 1204 | ERR("consumer closed the command socket"); |
| 1205 | goto error; |
| 1206 | } |
| 1207 | |
| 1208 | ERR("consumer return code : %s", |
| 1209 | lttcomm_get_readable_code(-code)); |
| 1210 | |
| 1211 | goto exit; |
| 1212 | } else if (pollfd == consumer_data->metadata_fd) { |
| 1213 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP) |
| 1214 | && !(revents & LPOLLIN)) { |
| 1215 | ERR("consumer err metadata socket second poll error"); |
| 1216 | goto error; |
| 1217 | } |
| 1218 | /* UST metadata requests */ |
| 1219 | ret = ust_consumer_metadata_request( |
| 1220 | &consumer_data->metadata_sock); |
| 1221 | if (ret < 0) { |
| 1222 | ERR("Handling metadata request"); |
| 1223 | goto error; |
| 1224 | } |
| 1225 | } |
| 1226 | /* No need for an else branch all FDs are tested prior. */ |
| 1227 | } |
| 1228 | health_code_update(); |
| 1229 | } |
| 1230 | |
| 1231 | exit: |
| 1232 | error: |
| 1233 | /* |
| 1234 | * We lock here because we are about to close the sockets and some other |
| 1235 | * thread might be using them so get exclusive access which will abort all |
| 1236 | * other consumer command by other threads. |
| 1237 | */ |
| 1238 | pthread_mutex_lock(&consumer_data->lock); |
| 1239 | |
| 1240 | /* Immediately set the consumerd state to stopped */ |
| 1241 | if (consumer_data->type == LTTNG_CONSUMER_KERNEL) { |
| 1242 | uatomic_set(&kernel_consumerd_state, CONSUMER_ERROR); |
| 1243 | } else if (consumer_data->type == LTTNG_CONSUMER64_UST || |
| 1244 | consumer_data->type == LTTNG_CONSUMER32_UST) { |
| 1245 | uatomic_set(&ust_consumerd_state, CONSUMER_ERROR); |
| 1246 | } else { |
| 1247 | /* Code flow error... */ |
| 1248 | assert(0); |
| 1249 | } |
| 1250 | |
| 1251 | if (consumer_data->err_sock >= 0) { |
| 1252 | ret = close(consumer_data->err_sock); |
| 1253 | if (ret) { |
| 1254 | PERROR("close"); |
| 1255 | } |
| 1256 | consumer_data->err_sock = -1; |
| 1257 | } |
| 1258 | if (consumer_data->cmd_sock >= 0) { |
| 1259 | ret = close(consumer_data->cmd_sock); |
| 1260 | if (ret) { |
| 1261 | PERROR("close"); |
| 1262 | } |
| 1263 | consumer_data->cmd_sock = -1; |
| 1264 | } |
| 1265 | if (consumer_data->metadata_sock.fd_ptr && |
| 1266 | *consumer_data->metadata_sock.fd_ptr >= 0) { |
| 1267 | ret = close(*consumer_data->metadata_sock.fd_ptr); |
| 1268 | if (ret) { |
| 1269 | PERROR("close"); |
| 1270 | } |
| 1271 | } |
| 1272 | if (sock >= 0) { |
| 1273 | ret = close(sock); |
| 1274 | if (ret) { |
| 1275 | PERROR("close"); |
| 1276 | } |
| 1277 | } |
| 1278 | |
| 1279 | unlink(consumer_data->err_unix_sock_path); |
| 1280 | unlink(consumer_data->cmd_unix_sock_path); |
| 1281 | pthread_mutex_unlock(&consumer_data->lock); |
| 1282 | |
| 1283 | /* Cleanup metadata socket mutex. */ |
| 1284 | if (consumer_data->metadata_sock.lock) { |
| 1285 | pthread_mutex_destroy(consumer_data->metadata_sock.lock); |
| 1286 | free(consumer_data->metadata_sock.lock); |
| 1287 | } |
| 1288 | lttng_poll_clean(&events); |
| 1289 | |
| 1290 | if (cmd_socket_wrapper) { |
| 1291 | consumer_destroy_socket(cmd_socket_wrapper); |
| 1292 | } |
| 1293 | error_poll: |
| 1294 | if (err) { |
| 1295 | health_error(); |
| 1296 | ERR("Health error occurred in %s", __func__); |
| 1297 | } |
| 1298 | health_unregister(health_sessiond); |
| 1299 | DBG("consumer thread cleanup completed"); |
| 1300 | |
| 1301 | rcu_thread_offline(); |
| 1302 | rcu_unregister_thread(); |
| 1303 | |
| 1304 | return NULL; |
| 1305 | } |
| 1306 | |
| 1307 | /* |
| 1308 | * This thread receives application command sockets (FDs) on the |
| 1309 | * apps_cmd_pipe and waits (polls) on them until they are closed |
| 1310 | * or an error occurs. |
| 1311 | * |
| 1312 | * At that point, it flushes the data (tracing and metadata) associated |
| 1313 | * with this application and tears down ust app sessions and other |
| 1314 | * associated data structures through ust_app_unregister(). |
| 1315 | * |
| 1316 | * Note that this thread never sends commands to the applications |
| 1317 | * through the command sockets; it merely listens for hang-ups |
| 1318 | * and errors on those sockets and cleans-up as they occur. |
| 1319 | */ |
| 1320 | static void *thread_manage_apps(void *data) |
| 1321 | { |
| 1322 | int i, ret, pollfd, err = -1; |
| 1323 | ssize_t size_ret; |
| 1324 | uint32_t revents, nb_fd; |
| 1325 | struct lttng_poll_event events; |
| 1326 | |
| 1327 | DBG("[thread] Manage application started"); |
| 1328 | |
| 1329 | rcu_register_thread(); |
| 1330 | rcu_thread_online(); |
| 1331 | |
| 1332 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_MANAGE); |
| 1333 | |
| 1334 | if (testpoint(sessiond_thread_manage_apps)) { |
| 1335 | goto error_testpoint; |
| 1336 | } |
| 1337 | |
| 1338 | health_code_update(); |
| 1339 | |
| 1340 | ret = sessiond_set_thread_pollset(&events, 2); |
| 1341 | if (ret < 0) { |
| 1342 | goto error_poll_create; |
| 1343 | } |
| 1344 | |
| 1345 | ret = lttng_poll_add(&events, apps_cmd_pipe[0], LPOLLIN | LPOLLRDHUP); |
| 1346 | if (ret < 0) { |
| 1347 | goto error; |
| 1348 | } |
| 1349 | |
| 1350 | if (testpoint(sessiond_thread_manage_apps_before_loop)) { |
| 1351 | goto error; |
| 1352 | } |
| 1353 | |
| 1354 | health_code_update(); |
| 1355 | |
| 1356 | while (1) { |
| 1357 | DBG("Apps thread polling"); |
| 1358 | |
| 1359 | /* Inifinite blocking call, waiting for transmission */ |
| 1360 | restart: |
| 1361 | health_poll_entry(); |
| 1362 | ret = lttng_poll_wait(&events, -1); |
| 1363 | DBG("Apps thread return from poll on %d fds", |
| 1364 | LTTNG_POLL_GETNB(&events)); |
| 1365 | health_poll_exit(); |
| 1366 | if (ret < 0) { |
| 1367 | /* |
| 1368 | * Restart interrupted system call. |
| 1369 | */ |
| 1370 | if (errno == EINTR) { |
| 1371 | goto restart; |
| 1372 | } |
| 1373 | goto error; |
| 1374 | } |
| 1375 | |
| 1376 | nb_fd = ret; |
| 1377 | |
| 1378 | for (i = 0; i < nb_fd; i++) { |
| 1379 | /* Fetch once the poll data */ |
| 1380 | revents = LTTNG_POLL_GETEV(&events, i); |
| 1381 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 1382 | |
| 1383 | health_code_update(); |
| 1384 | |
| 1385 | if (!revents) { |
| 1386 | /* No activity for this FD (poll implementation). */ |
| 1387 | continue; |
| 1388 | } |
| 1389 | |
| 1390 | /* Thread quit pipe has been closed. Killing thread. */ |
| 1391 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
| 1392 | if (ret) { |
| 1393 | err = 0; |
| 1394 | goto exit; |
| 1395 | } |
| 1396 | |
| 1397 | /* Inspect the apps cmd pipe */ |
| 1398 | if (pollfd == apps_cmd_pipe[0]) { |
| 1399 | if (revents & LPOLLIN) { |
| 1400 | int sock; |
| 1401 | |
| 1402 | /* Empty pipe */ |
| 1403 | size_ret = lttng_read(apps_cmd_pipe[0], &sock, sizeof(sock)); |
| 1404 | if (size_ret < sizeof(sock)) { |
| 1405 | PERROR("read apps cmd pipe"); |
| 1406 | goto error; |
| 1407 | } |
| 1408 | |
| 1409 | health_code_update(); |
| 1410 | |
| 1411 | /* |
| 1412 | * Since this is a command socket (write then read), |
| 1413 | * we only monitor the error events of the socket. |
| 1414 | */ |
| 1415 | ret = lttng_poll_add(&events, sock, |
| 1416 | LPOLLERR | LPOLLHUP | LPOLLRDHUP); |
| 1417 | if (ret < 0) { |
| 1418 | goto error; |
| 1419 | } |
| 1420 | |
| 1421 | DBG("Apps with sock %d added to poll set", sock); |
| 1422 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 1423 | ERR("Apps command pipe error"); |
| 1424 | goto error; |
| 1425 | } else { |
| 1426 | ERR("Unknown poll events %u for sock %d", revents, pollfd); |
| 1427 | goto error; |
| 1428 | } |
| 1429 | } else { |
| 1430 | /* |
| 1431 | * At this point, we know that a registered application made |
| 1432 | * the event at poll_wait. |
| 1433 | */ |
| 1434 | if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 1435 | /* Removing from the poll set */ |
| 1436 | ret = lttng_poll_del(&events, pollfd); |
| 1437 | if (ret < 0) { |
| 1438 | goto error; |
| 1439 | } |
| 1440 | |
| 1441 | /* Socket closed on remote end. */ |
| 1442 | ust_app_unregister(pollfd); |
| 1443 | } else { |
| 1444 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); |
| 1445 | goto error; |
| 1446 | } |
| 1447 | } |
| 1448 | |
| 1449 | health_code_update(); |
| 1450 | } |
| 1451 | } |
| 1452 | |
| 1453 | exit: |
| 1454 | error: |
| 1455 | lttng_poll_clean(&events); |
| 1456 | error_poll_create: |
| 1457 | error_testpoint: |
| 1458 | utils_close_pipe(apps_cmd_pipe); |
| 1459 | apps_cmd_pipe[0] = apps_cmd_pipe[1] = -1; |
| 1460 | |
| 1461 | /* |
| 1462 | * We don't clean the UST app hash table here since already registered |
| 1463 | * applications can still be controlled so let them be until the session |
| 1464 | * daemon dies or the applications stop. |
| 1465 | */ |
| 1466 | |
| 1467 | if (err) { |
| 1468 | health_error(); |
| 1469 | ERR("Health error occurred in %s", __func__); |
| 1470 | } |
| 1471 | health_unregister(health_sessiond); |
| 1472 | DBG("Application communication apps thread cleanup complete"); |
| 1473 | rcu_thread_offline(); |
| 1474 | rcu_unregister_thread(); |
| 1475 | return NULL; |
| 1476 | } |
| 1477 | |
| 1478 | /* |
| 1479 | * Send a socket to a thread This is called from the dispatch UST registration |
| 1480 | * thread once all sockets are set for the application. |
| 1481 | * |
| 1482 | * The sock value can be invalid, we don't really care, the thread will handle |
| 1483 | * it and make the necessary cleanup if so. |
| 1484 | * |
| 1485 | * On success, return 0 else a negative value being the errno message of the |
| 1486 | * write(). |
| 1487 | */ |
| 1488 | static int send_socket_to_thread(int fd, int sock) |
| 1489 | { |
| 1490 | ssize_t ret; |
| 1491 | |
| 1492 | /* |
| 1493 | * It's possible that the FD is set as invalid with -1 concurrently just |
| 1494 | * before calling this function being a shutdown state of the thread. |
| 1495 | */ |
| 1496 | if (fd < 0) { |
| 1497 | ret = -EBADF; |
| 1498 | goto error; |
| 1499 | } |
| 1500 | |
| 1501 | ret = lttng_write(fd, &sock, sizeof(sock)); |
| 1502 | if (ret < sizeof(sock)) { |
| 1503 | PERROR("write apps pipe %d", fd); |
| 1504 | if (ret < 0) { |
| 1505 | ret = -errno; |
| 1506 | } |
| 1507 | goto error; |
| 1508 | } |
| 1509 | |
| 1510 | /* All good. Don't send back the write positive ret value. */ |
| 1511 | ret = 0; |
| 1512 | error: |
| 1513 | return (int) ret; |
| 1514 | } |
| 1515 | |
| 1516 | /* |
| 1517 | * Sanitize the wait queue of the dispatch registration thread meaning removing |
| 1518 | * invalid nodes from it. This is to avoid memory leaks for the case the UST |
| 1519 | * notify socket is never received. |
| 1520 | */ |
| 1521 | static void sanitize_wait_queue(struct ust_reg_wait_queue *wait_queue) |
| 1522 | { |
| 1523 | int ret, nb_fd = 0, i; |
| 1524 | unsigned int fd_added = 0; |
| 1525 | struct lttng_poll_event events; |
| 1526 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
| 1527 | |
| 1528 | assert(wait_queue); |
| 1529 | |
| 1530 | lttng_poll_init(&events); |
| 1531 | |
| 1532 | /* Just skip everything for an empty queue. */ |
| 1533 | if (!wait_queue->count) { |
| 1534 | goto end; |
| 1535 | } |
| 1536 | |
| 1537 | ret = lttng_poll_create(&events, wait_queue->count, LTTNG_CLOEXEC); |
| 1538 | if (ret < 0) { |
| 1539 | goto error_create; |
| 1540 | } |
| 1541 | |
| 1542 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
| 1543 | &wait_queue->head, head) { |
| 1544 | assert(wait_node->app); |
| 1545 | ret = lttng_poll_add(&events, wait_node->app->sock, |
| 1546 | LPOLLHUP | LPOLLERR); |
| 1547 | if (ret < 0) { |
| 1548 | goto error; |
| 1549 | } |
| 1550 | |
| 1551 | fd_added = 1; |
| 1552 | } |
| 1553 | |
| 1554 | if (!fd_added) { |
| 1555 | goto end; |
| 1556 | } |
| 1557 | |
| 1558 | /* |
| 1559 | * Poll but don't block so we can quickly identify the faulty events and |
| 1560 | * clean them afterwards from the wait queue. |
| 1561 | */ |
| 1562 | ret = lttng_poll_wait(&events, 0); |
| 1563 | if (ret < 0) { |
| 1564 | goto error; |
| 1565 | } |
| 1566 | nb_fd = ret; |
| 1567 | |
| 1568 | for (i = 0; i < nb_fd; i++) { |
| 1569 | /* Get faulty FD. */ |
| 1570 | uint32_t revents = LTTNG_POLL_GETEV(&events, i); |
| 1571 | int pollfd = LTTNG_POLL_GETFD(&events, i); |
| 1572 | |
| 1573 | if (!revents) { |
| 1574 | /* No activity for this FD (poll implementation). */ |
| 1575 | continue; |
| 1576 | } |
| 1577 | |
| 1578 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
| 1579 | &wait_queue->head, head) { |
| 1580 | if (pollfd == wait_node->app->sock && |
| 1581 | (revents & (LPOLLHUP | LPOLLERR))) { |
| 1582 | cds_list_del(&wait_node->head); |
| 1583 | wait_queue->count--; |
| 1584 | ust_app_destroy(wait_node->app); |
| 1585 | free(wait_node); |
| 1586 | /* |
| 1587 | * Silence warning of use-after-free in |
| 1588 | * cds_list_for_each_entry_safe which uses |
| 1589 | * __typeof__(*wait_node). |
| 1590 | */ |
| 1591 | wait_node = NULL; |
| 1592 | break; |
| 1593 | } else { |
| 1594 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); |
| 1595 | goto error; |
| 1596 | } |
| 1597 | } |
| 1598 | } |
| 1599 | |
| 1600 | if (nb_fd > 0) { |
| 1601 | DBG("Wait queue sanitized, %d node were cleaned up", nb_fd); |
| 1602 | } |
| 1603 | |
| 1604 | end: |
| 1605 | lttng_poll_clean(&events); |
| 1606 | return; |
| 1607 | |
| 1608 | error: |
| 1609 | lttng_poll_clean(&events); |
| 1610 | error_create: |
| 1611 | ERR("Unable to sanitize wait queue"); |
| 1612 | return; |
| 1613 | } |
| 1614 | |
| 1615 | /* |
| 1616 | * Dispatch request from the registration threads to the application |
| 1617 | * communication thread. |
| 1618 | */ |
| 1619 | static void *thread_dispatch_ust_registration(void *data) |
| 1620 | { |
| 1621 | int ret, err = -1; |
| 1622 | struct cds_wfcq_node *node; |
| 1623 | struct ust_command *ust_cmd = NULL; |
| 1624 | struct ust_reg_wait_node *wait_node = NULL, *tmp_wait_node; |
| 1625 | struct ust_reg_wait_queue wait_queue = { |
| 1626 | .count = 0, |
| 1627 | }; |
| 1628 | |
| 1629 | rcu_register_thread(); |
| 1630 | |
| 1631 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG_DISPATCH); |
| 1632 | |
| 1633 | if (testpoint(sessiond_thread_app_reg_dispatch)) { |
| 1634 | goto error_testpoint; |
| 1635 | } |
| 1636 | |
| 1637 | health_code_update(); |
| 1638 | |
| 1639 | CDS_INIT_LIST_HEAD(&wait_queue.head); |
| 1640 | |
| 1641 | DBG("[thread] Dispatch UST command started"); |
| 1642 | |
| 1643 | for (;;) { |
| 1644 | health_code_update(); |
| 1645 | |
| 1646 | /* Atomically prepare the queue futex */ |
| 1647 | futex_nto1_prepare(&ust_cmd_queue.futex); |
| 1648 | |
| 1649 | if (CMM_LOAD_SHARED(dispatch_thread_exit)) { |
| 1650 | break; |
| 1651 | } |
| 1652 | |
| 1653 | do { |
| 1654 | struct ust_app *app = NULL; |
| 1655 | ust_cmd = NULL; |
| 1656 | |
| 1657 | /* |
| 1658 | * Make sure we don't have node(s) that have hung up before receiving |
| 1659 | * the notify socket. This is to clean the list in order to avoid |
| 1660 | * memory leaks from notify socket that are never seen. |
| 1661 | */ |
| 1662 | sanitize_wait_queue(&wait_queue); |
| 1663 | |
| 1664 | health_code_update(); |
| 1665 | /* Dequeue command for registration */ |
| 1666 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
| 1667 | if (node == NULL) { |
| 1668 | DBG("Woken up but nothing in the UST command queue"); |
| 1669 | /* Continue thread execution */ |
| 1670 | break; |
| 1671 | } |
| 1672 | |
| 1673 | ust_cmd = caa_container_of(node, struct ust_command, node); |
| 1674 | |
| 1675 | DBG("Dispatching UST registration pid:%d ppid:%d uid:%d" |
| 1676 | " gid:%d sock:%d name:%s (version %d.%d)", |
| 1677 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, |
| 1678 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, |
| 1679 | ust_cmd->sock, ust_cmd->reg_msg.name, |
| 1680 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); |
| 1681 | |
| 1682 | if (ust_cmd->reg_msg.type == USTCTL_SOCKET_CMD) { |
| 1683 | wait_node = zmalloc(sizeof(*wait_node)); |
| 1684 | if (!wait_node) { |
| 1685 | PERROR("zmalloc wait_node dispatch"); |
| 1686 | ret = close(ust_cmd->sock); |
| 1687 | if (ret < 0) { |
| 1688 | PERROR("close ust sock dispatch %d", ust_cmd->sock); |
| 1689 | } |
| 1690 | lttng_fd_put(LTTNG_FD_APPS, 1); |
| 1691 | free(ust_cmd); |
| 1692 | goto error; |
| 1693 | } |
| 1694 | CDS_INIT_LIST_HEAD(&wait_node->head); |
| 1695 | |
| 1696 | /* Create application object if socket is CMD. */ |
| 1697 | wait_node->app = ust_app_create(&ust_cmd->reg_msg, |
| 1698 | ust_cmd->sock); |
| 1699 | if (!wait_node->app) { |
| 1700 | ret = close(ust_cmd->sock); |
| 1701 | if (ret < 0) { |
| 1702 | PERROR("close ust sock dispatch %d", ust_cmd->sock); |
| 1703 | } |
| 1704 | lttng_fd_put(LTTNG_FD_APPS, 1); |
| 1705 | free(wait_node); |
| 1706 | free(ust_cmd); |
| 1707 | continue; |
| 1708 | } |
| 1709 | /* |
| 1710 | * Add application to the wait queue so we can set the notify |
| 1711 | * socket before putting this object in the global ht. |
| 1712 | */ |
| 1713 | cds_list_add(&wait_node->head, &wait_queue.head); |
| 1714 | wait_queue.count++; |
| 1715 | |
| 1716 | free(ust_cmd); |
| 1717 | /* |
| 1718 | * We have to continue here since we don't have the notify |
| 1719 | * socket and the application MUST be added to the hash table |
| 1720 | * only at that moment. |
| 1721 | */ |
| 1722 | continue; |
| 1723 | } else { |
| 1724 | /* |
| 1725 | * Look for the application in the local wait queue and set the |
| 1726 | * notify socket if found. |
| 1727 | */ |
| 1728 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
| 1729 | &wait_queue.head, head) { |
| 1730 | health_code_update(); |
| 1731 | if (wait_node->app->pid == ust_cmd->reg_msg.pid) { |
| 1732 | wait_node->app->notify_sock = ust_cmd->sock; |
| 1733 | cds_list_del(&wait_node->head); |
| 1734 | wait_queue.count--; |
| 1735 | app = wait_node->app; |
| 1736 | free(wait_node); |
| 1737 | DBG3("UST app notify socket %d is set", ust_cmd->sock); |
| 1738 | break; |
| 1739 | } |
| 1740 | } |
| 1741 | |
| 1742 | /* |
| 1743 | * With no application at this stage the received socket is |
| 1744 | * basically useless so close it before we free the cmd data |
| 1745 | * structure for good. |
| 1746 | */ |
| 1747 | if (!app) { |
| 1748 | ret = close(ust_cmd->sock); |
| 1749 | if (ret < 0) { |
| 1750 | PERROR("close ust sock dispatch %d", ust_cmd->sock); |
| 1751 | } |
| 1752 | lttng_fd_put(LTTNG_FD_APPS, 1); |
| 1753 | } |
| 1754 | free(ust_cmd); |
| 1755 | } |
| 1756 | |
| 1757 | if (app) { |
| 1758 | /* |
| 1759 | * @session_lock_list |
| 1760 | * |
| 1761 | * Lock the global session list so from the register up to the |
| 1762 | * registration done message, no thread can see the application |
| 1763 | * and change its state. |
| 1764 | */ |
| 1765 | session_lock_list(); |
| 1766 | rcu_read_lock(); |
| 1767 | |
| 1768 | /* |
| 1769 | * Add application to the global hash table. This needs to be |
| 1770 | * done before the update to the UST registry can locate the |
| 1771 | * application. |
| 1772 | */ |
| 1773 | ust_app_add(app); |
| 1774 | |
| 1775 | /* Set app version. This call will print an error if needed. */ |
| 1776 | (void) ust_app_version(app); |
| 1777 | |
| 1778 | /* Send notify socket through the notify pipe. */ |
| 1779 | ret = send_socket_to_thread(apps_cmd_notify_pipe[1], |
| 1780 | app->notify_sock); |
| 1781 | if (ret < 0) { |
| 1782 | rcu_read_unlock(); |
| 1783 | session_unlock_list(); |
| 1784 | /* |
| 1785 | * No notify thread, stop the UST tracing. However, this is |
| 1786 | * not an internal error of the this thread thus setting |
| 1787 | * the health error code to a normal exit. |
| 1788 | */ |
| 1789 | err = 0; |
| 1790 | goto error; |
| 1791 | } |
| 1792 | |
| 1793 | /* |
| 1794 | * Update newly registered application with the tracing |
| 1795 | * registry info already enabled information. |
| 1796 | */ |
| 1797 | update_ust_app(app->sock); |
| 1798 | |
| 1799 | /* |
| 1800 | * Don't care about return value. Let the manage apps threads |
| 1801 | * handle app unregistration upon socket close. |
| 1802 | */ |
| 1803 | (void) ust_app_register_done(app); |
| 1804 | |
| 1805 | /* |
| 1806 | * Even if the application socket has been closed, send the app |
| 1807 | * to the thread and unregistration will take place at that |
| 1808 | * place. |
| 1809 | */ |
| 1810 | ret = send_socket_to_thread(apps_cmd_pipe[1], app->sock); |
| 1811 | if (ret < 0) { |
| 1812 | rcu_read_unlock(); |
| 1813 | session_unlock_list(); |
| 1814 | /* |
| 1815 | * No apps. thread, stop the UST tracing. However, this is |
| 1816 | * not an internal error of the this thread thus setting |
| 1817 | * the health error code to a normal exit. |
| 1818 | */ |
| 1819 | err = 0; |
| 1820 | goto error; |
| 1821 | } |
| 1822 | |
| 1823 | rcu_read_unlock(); |
| 1824 | session_unlock_list(); |
| 1825 | } |
| 1826 | } while (node != NULL); |
| 1827 | |
| 1828 | health_poll_entry(); |
| 1829 | /* Futex wait on queue. Blocking call on futex() */ |
| 1830 | futex_nto1_wait(&ust_cmd_queue.futex); |
| 1831 | health_poll_exit(); |
| 1832 | } |
| 1833 | /* Normal exit, no error */ |
| 1834 | err = 0; |
| 1835 | |
| 1836 | error: |
| 1837 | /* Clean up wait queue. */ |
| 1838 | cds_list_for_each_entry_safe(wait_node, tmp_wait_node, |
| 1839 | &wait_queue.head, head) { |
| 1840 | cds_list_del(&wait_node->head); |
| 1841 | wait_queue.count--; |
| 1842 | free(wait_node); |
| 1843 | } |
| 1844 | |
| 1845 | /* Empty command queue. */ |
| 1846 | for (;;) { |
| 1847 | /* Dequeue command for registration */ |
| 1848 | node = cds_wfcq_dequeue_blocking(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
| 1849 | if (node == NULL) { |
| 1850 | break; |
| 1851 | } |
| 1852 | ust_cmd = caa_container_of(node, struct ust_command, node); |
| 1853 | ret = close(ust_cmd->sock); |
| 1854 | if (ret < 0) { |
| 1855 | PERROR("close ust sock exit dispatch %d", ust_cmd->sock); |
| 1856 | } |
| 1857 | lttng_fd_put(LTTNG_FD_APPS, 1); |
| 1858 | free(ust_cmd); |
| 1859 | } |
| 1860 | |
| 1861 | error_testpoint: |
| 1862 | DBG("Dispatch thread dying"); |
| 1863 | if (err) { |
| 1864 | health_error(); |
| 1865 | ERR("Health error occurred in %s", __func__); |
| 1866 | } |
| 1867 | health_unregister(health_sessiond); |
| 1868 | rcu_unregister_thread(); |
| 1869 | return NULL; |
| 1870 | } |
| 1871 | |
| 1872 | /* |
| 1873 | * This thread manage application registration. |
| 1874 | */ |
| 1875 | static void *thread_registration_apps(void *data) |
| 1876 | { |
| 1877 | int sock = -1, i, ret, pollfd, err = -1; |
| 1878 | uint32_t revents, nb_fd; |
| 1879 | struct lttng_poll_event events; |
| 1880 | /* |
| 1881 | * Get allocated in this thread, enqueued to a global queue, dequeued and |
| 1882 | * freed in the manage apps thread. |
| 1883 | */ |
| 1884 | struct ust_command *ust_cmd = NULL; |
| 1885 | |
| 1886 | DBG("[thread] Manage application registration started"); |
| 1887 | |
| 1888 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_APP_REG); |
| 1889 | |
| 1890 | if (testpoint(sessiond_thread_registration_apps)) { |
| 1891 | goto error_testpoint; |
| 1892 | } |
| 1893 | |
| 1894 | ret = lttcomm_listen_unix_sock(apps_sock); |
| 1895 | if (ret < 0) { |
| 1896 | goto error_listen; |
| 1897 | } |
| 1898 | |
| 1899 | /* |
| 1900 | * Pass 2 as size here for the thread quit pipe and apps socket. Nothing |
| 1901 | * more will be added to this poll set. |
| 1902 | */ |
| 1903 | ret = sessiond_set_thread_pollset(&events, 2); |
| 1904 | if (ret < 0) { |
| 1905 | goto error_create_poll; |
| 1906 | } |
| 1907 | |
| 1908 | /* Add the application registration socket */ |
| 1909 | ret = lttng_poll_add(&events, apps_sock, LPOLLIN | LPOLLRDHUP); |
| 1910 | if (ret < 0) { |
| 1911 | goto error_poll_add; |
| 1912 | } |
| 1913 | |
| 1914 | /* Notify all applications to register */ |
| 1915 | ret = notify_ust_apps(1); |
| 1916 | if (ret < 0) { |
| 1917 | ERR("Failed to notify applications or create the wait shared memory.\n" |
| 1918 | "Execution continues but there might be problem for already\n" |
| 1919 | "running applications that wishes to register."); |
| 1920 | } |
| 1921 | |
| 1922 | while (1) { |
| 1923 | DBG("Accepting application registration"); |
| 1924 | |
| 1925 | /* Inifinite blocking call, waiting for transmission */ |
| 1926 | restart: |
| 1927 | health_poll_entry(); |
| 1928 | ret = lttng_poll_wait(&events, -1); |
| 1929 | health_poll_exit(); |
| 1930 | if (ret < 0) { |
| 1931 | /* |
| 1932 | * Restart interrupted system call. |
| 1933 | */ |
| 1934 | if (errno == EINTR) { |
| 1935 | goto restart; |
| 1936 | } |
| 1937 | goto error; |
| 1938 | } |
| 1939 | |
| 1940 | nb_fd = ret; |
| 1941 | |
| 1942 | for (i = 0; i < nb_fd; i++) { |
| 1943 | health_code_update(); |
| 1944 | |
| 1945 | /* Fetch once the poll data */ |
| 1946 | revents = LTTNG_POLL_GETEV(&events, i); |
| 1947 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 1948 | |
| 1949 | if (!revents) { |
| 1950 | /* No activity for this FD (poll implementation). */ |
| 1951 | continue; |
| 1952 | } |
| 1953 | |
| 1954 | /* Thread quit pipe has been closed. Killing thread. */ |
| 1955 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
| 1956 | if (ret) { |
| 1957 | err = 0; |
| 1958 | goto exit; |
| 1959 | } |
| 1960 | |
| 1961 | /* Event on the registration socket */ |
| 1962 | if (pollfd == apps_sock) { |
| 1963 | if (revents & LPOLLIN) { |
| 1964 | sock = lttcomm_accept_unix_sock(apps_sock); |
| 1965 | if (sock < 0) { |
| 1966 | goto error; |
| 1967 | } |
| 1968 | |
| 1969 | /* |
| 1970 | * Set socket timeout for both receiving and ending. |
| 1971 | * app_socket_timeout is in seconds, whereas |
| 1972 | * lttcomm_setsockopt_rcv_timeout and |
| 1973 | * lttcomm_setsockopt_snd_timeout expect msec as |
| 1974 | * parameter. |
| 1975 | */ |
| 1976 | if (config.app_socket_timeout >= 0) { |
| 1977 | (void) lttcomm_setsockopt_rcv_timeout(sock, |
| 1978 | config.app_socket_timeout * 1000); |
| 1979 | (void) lttcomm_setsockopt_snd_timeout(sock, |
| 1980 | config.app_socket_timeout * 1000); |
| 1981 | } |
| 1982 | |
| 1983 | /* |
| 1984 | * Set the CLOEXEC flag. Return code is useless because |
| 1985 | * either way, the show must go on. |
| 1986 | */ |
| 1987 | (void) utils_set_fd_cloexec(sock); |
| 1988 | |
| 1989 | /* Create UST registration command for enqueuing */ |
| 1990 | ust_cmd = zmalloc(sizeof(struct ust_command)); |
| 1991 | if (ust_cmd == NULL) { |
| 1992 | PERROR("ust command zmalloc"); |
| 1993 | ret = close(sock); |
| 1994 | if (ret) { |
| 1995 | PERROR("close"); |
| 1996 | } |
| 1997 | goto error; |
| 1998 | } |
| 1999 | |
| 2000 | /* |
| 2001 | * Using message-based transmissions to ensure we don't |
| 2002 | * have to deal with partially received messages. |
| 2003 | */ |
| 2004 | ret = lttng_fd_get(LTTNG_FD_APPS, 1); |
| 2005 | if (ret < 0) { |
| 2006 | ERR("Exhausted file descriptors allowed for applications."); |
| 2007 | free(ust_cmd); |
| 2008 | ret = close(sock); |
| 2009 | if (ret) { |
| 2010 | PERROR("close"); |
| 2011 | } |
| 2012 | sock = -1; |
| 2013 | continue; |
| 2014 | } |
| 2015 | |
| 2016 | health_code_update(); |
| 2017 | ret = ust_app_recv_registration(sock, &ust_cmd->reg_msg); |
| 2018 | if (ret < 0) { |
| 2019 | free(ust_cmd); |
| 2020 | /* Close socket of the application. */ |
| 2021 | ret = close(sock); |
| 2022 | if (ret) { |
| 2023 | PERROR("close"); |
| 2024 | } |
| 2025 | lttng_fd_put(LTTNG_FD_APPS, 1); |
| 2026 | sock = -1; |
| 2027 | continue; |
| 2028 | } |
| 2029 | health_code_update(); |
| 2030 | |
| 2031 | ust_cmd->sock = sock; |
| 2032 | sock = -1; |
| 2033 | |
| 2034 | DBG("UST registration received with pid:%d ppid:%d uid:%d" |
| 2035 | " gid:%d sock:%d name:%s (version %d.%d)", |
| 2036 | ust_cmd->reg_msg.pid, ust_cmd->reg_msg.ppid, |
| 2037 | ust_cmd->reg_msg.uid, ust_cmd->reg_msg.gid, |
| 2038 | ust_cmd->sock, ust_cmd->reg_msg.name, |
| 2039 | ust_cmd->reg_msg.major, ust_cmd->reg_msg.minor); |
| 2040 | |
| 2041 | /* |
| 2042 | * Lock free enqueue the registration request. The red pill |
| 2043 | * has been taken! This apps will be part of the *system*. |
| 2044 | */ |
| 2045 | cds_wfcq_enqueue(&ust_cmd_queue.head, &ust_cmd_queue.tail, &ust_cmd->node); |
| 2046 | |
| 2047 | /* |
| 2048 | * Wake the registration queue futex. Implicit memory |
| 2049 | * barrier with the exchange in cds_wfcq_enqueue. |
| 2050 | */ |
| 2051 | futex_nto1_wake(&ust_cmd_queue.futex); |
| 2052 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 2053 | ERR("Register apps socket poll error"); |
| 2054 | goto error; |
| 2055 | } else { |
| 2056 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); |
| 2057 | goto error; |
| 2058 | } |
| 2059 | } |
| 2060 | } |
| 2061 | } |
| 2062 | |
| 2063 | exit: |
| 2064 | error: |
| 2065 | /* Notify that the registration thread is gone */ |
| 2066 | notify_ust_apps(0); |
| 2067 | |
| 2068 | if (apps_sock >= 0) { |
| 2069 | ret = close(apps_sock); |
| 2070 | if (ret) { |
| 2071 | PERROR("close"); |
| 2072 | } |
| 2073 | } |
| 2074 | if (sock >= 0) { |
| 2075 | ret = close(sock); |
| 2076 | if (ret) { |
| 2077 | PERROR("close"); |
| 2078 | } |
| 2079 | lttng_fd_put(LTTNG_FD_APPS, 1); |
| 2080 | } |
| 2081 | unlink(config.apps_unix_sock_path.value); |
| 2082 | |
| 2083 | error_poll_add: |
| 2084 | lttng_poll_clean(&events); |
| 2085 | error_listen: |
| 2086 | error_create_poll: |
| 2087 | error_testpoint: |
| 2088 | DBG("UST Registration thread cleanup complete"); |
| 2089 | if (err) { |
| 2090 | health_error(); |
| 2091 | ERR("Health error occurred in %s", __func__); |
| 2092 | } |
| 2093 | health_unregister(health_sessiond); |
| 2094 | |
| 2095 | return NULL; |
| 2096 | } |
| 2097 | |
| 2098 | /* |
| 2099 | * Start the thread_manage_consumer. This must be done after a lttng-consumerd |
| 2100 | * exec or it will fails. |
| 2101 | */ |
| 2102 | static int spawn_consumer_thread(struct consumer_data *consumer_data) |
| 2103 | { |
| 2104 | int ret, clock_ret; |
| 2105 | struct timespec timeout; |
| 2106 | |
| 2107 | /* |
| 2108 | * Make sure we set the readiness flag to 0 because we are NOT ready. |
| 2109 | * This access to consumer_thread_is_ready does not need to be |
| 2110 | * protected by consumer_data.cond_mutex (yet) since the consumer |
| 2111 | * management thread has not been started at this point. |
| 2112 | */ |
| 2113 | consumer_data->consumer_thread_is_ready = 0; |
| 2114 | |
| 2115 | /* Setup pthread condition */ |
| 2116 | ret = pthread_condattr_init(&consumer_data->condattr); |
| 2117 | if (ret) { |
| 2118 | errno = ret; |
| 2119 | PERROR("pthread_condattr_init consumer data"); |
| 2120 | goto error; |
| 2121 | } |
| 2122 | |
| 2123 | /* |
| 2124 | * Set the monotonic clock in order to make sure we DO NOT jump in time |
| 2125 | * between the clock_gettime() call and the timedwait call. See bug #324 |
| 2126 | * for a more details and how we noticed it. |
| 2127 | */ |
| 2128 | ret = pthread_condattr_setclock(&consumer_data->condattr, CLOCK_MONOTONIC); |
| 2129 | if (ret) { |
| 2130 | errno = ret; |
| 2131 | PERROR("pthread_condattr_setclock consumer data"); |
| 2132 | goto error; |
| 2133 | } |
| 2134 | |
| 2135 | ret = pthread_cond_init(&consumer_data->cond, &consumer_data->condattr); |
| 2136 | if (ret) { |
| 2137 | errno = ret; |
| 2138 | PERROR("pthread_cond_init consumer data"); |
| 2139 | goto error; |
| 2140 | } |
| 2141 | |
| 2142 | ret = pthread_create(&consumer_data->thread, default_pthread_attr(), |
| 2143 | thread_manage_consumer, consumer_data); |
| 2144 | if (ret) { |
| 2145 | errno = ret; |
| 2146 | PERROR("pthread_create consumer"); |
| 2147 | ret = -1; |
| 2148 | goto error; |
| 2149 | } |
| 2150 | |
| 2151 | /* We are about to wait on a pthread condition */ |
| 2152 | pthread_mutex_lock(&consumer_data->cond_mutex); |
| 2153 | |
| 2154 | /* Get time for sem_timedwait absolute timeout */ |
| 2155 | clock_ret = lttng_clock_gettime(CLOCK_MONOTONIC, &timeout); |
| 2156 | /* |
| 2157 | * Set the timeout for the condition timed wait even if the clock gettime |
| 2158 | * call fails since we might loop on that call and we want to avoid to |
| 2159 | * increment the timeout too many times. |
| 2160 | */ |
| 2161 | timeout.tv_sec += DEFAULT_SEM_WAIT_TIMEOUT; |
| 2162 | |
| 2163 | /* |
| 2164 | * The following loop COULD be skipped in some conditions so this is why we |
| 2165 | * set ret to 0 in order to make sure at least one round of the loop is |
| 2166 | * done. |
| 2167 | */ |
| 2168 | ret = 0; |
| 2169 | |
| 2170 | /* |
| 2171 | * Loop until the condition is reached or when a timeout is reached. Note |
| 2172 | * that the pthread_cond_timedwait(P) man page specifies that EINTR can NOT |
| 2173 | * be returned but the pthread_cond(3), from the glibc-doc, says that it is |
| 2174 | * possible. This loop does not take any chances and works with both of |
| 2175 | * them. |
| 2176 | */ |
| 2177 | while (!consumer_data->consumer_thread_is_ready && ret != ETIMEDOUT) { |
| 2178 | if (clock_ret < 0) { |
| 2179 | PERROR("clock_gettime spawn consumer"); |
| 2180 | /* Infinite wait for the consumerd thread to be ready */ |
| 2181 | ret = pthread_cond_wait(&consumer_data->cond, |
| 2182 | &consumer_data->cond_mutex); |
| 2183 | } else { |
| 2184 | ret = pthread_cond_timedwait(&consumer_data->cond, |
| 2185 | &consumer_data->cond_mutex, &timeout); |
| 2186 | } |
| 2187 | } |
| 2188 | |
| 2189 | /* Release the pthread condition */ |
| 2190 | pthread_mutex_unlock(&consumer_data->cond_mutex); |
| 2191 | |
| 2192 | if (ret != 0) { |
| 2193 | errno = ret; |
| 2194 | if (ret == ETIMEDOUT) { |
| 2195 | int pth_ret; |
| 2196 | |
| 2197 | /* |
| 2198 | * Call has timed out so we kill the kconsumerd_thread and return |
| 2199 | * an error. |
| 2200 | */ |
| 2201 | ERR("Condition timed out. The consumer thread was never ready." |
| 2202 | " Killing it"); |
| 2203 | pth_ret = pthread_cancel(consumer_data->thread); |
| 2204 | if (pth_ret < 0) { |
| 2205 | PERROR("pthread_cancel consumer thread"); |
| 2206 | } |
| 2207 | } else { |
| 2208 | PERROR("pthread_cond_wait failed consumer thread"); |
| 2209 | } |
| 2210 | /* Caller is expecting a negative value on failure. */ |
| 2211 | ret = -1; |
| 2212 | goto error; |
| 2213 | } |
| 2214 | |
| 2215 | pthread_mutex_lock(&consumer_data->pid_mutex); |
| 2216 | if (consumer_data->pid == 0) { |
| 2217 | ERR("Consumerd did not start"); |
| 2218 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
| 2219 | goto error; |
| 2220 | } |
| 2221 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
| 2222 | |
| 2223 | return 0; |
| 2224 | |
| 2225 | error: |
| 2226 | return ret; |
| 2227 | } |
| 2228 | |
| 2229 | /* |
| 2230 | * Join consumer thread |
| 2231 | */ |
| 2232 | static int join_consumer_thread(struct consumer_data *consumer_data) |
| 2233 | { |
| 2234 | void *status; |
| 2235 | |
| 2236 | /* Consumer pid must be a real one. */ |
| 2237 | if (consumer_data->pid > 0) { |
| 2238 | int ret; |
| 2239 | ret = kill(consumer_data->pid, SIGTERM); |
| 2240 | if (ret) { |
| 2241 | PERROR("Error killing consumer daemon"); |
| 2242 | return ret; |
| 2243 | } |
| 2244 | return pthread_join(consumer_data->thread, &status); |
| 2245 | } else { |
| 2246 | return 0; |
| 2247 | } |
| 2248 | } |
| 2249 | |
| 2250 | /* |
| 2251 | * Fork and exec a consumer daemon (consumerd). |
| 2252 | * |
| 2253 | * Return pid if successful else -1. |
| 2254 | */ |
| 2255 | static pid_t spawn_consumerd(struct consumer_data *consumer_data) |
| 2256 | { |
| 2257 | int ret; |
| 2258 | pid_t pid; |
| 2259 | const char *consumer_to_use; |
| 2260 | const char *verbosity; |
| 2261 | struct stat st; |
| 2262 | |
| 2263 | DBG("Spawning consumerd"); |
| 2264 | |
| 2265 | pid = fork(); |
| 2266 | if (pid == 0) { |
| 2267 | /* |
| 2268 | * Exec consumerd. |
| 2269 | */ |
| 2270 | if (config.verbose_consumer) { |
| 2271 | verbosity = "--verbose"; |
| 2272 | } else if (lttng_opt_quiet) { |
| 2273 | verbosity = "--quiet"; |
| 2274 | } else { |
| 2275 | verbosity = ""; |
| 2276 | } |
| 2277 | |
| 2278 | switch (consumer_data->type) { |
| 2279 | case LTTNG_CONSUMER_KERNEL: |
| 2280 | /* |
| 2281 | * Find out which consumerd to execute. We will first try the |
| 2282 | * 64-bit path, then the sessiond's installation directory, and |
| 2283 | * fallback on the 32-bit one, |
| 2284 | */ |
| 2285 | DBG3("Looking for a kernel consumer at these locations:"); |
| 2286 | DBG3(" 1) %s", config.consumerd64_bin_path.value ? : "NULL"); |
| 2287 | DBG3(" 2) %s/%s", INSTALL_BIN_PATH, DEFAULT_CONSUMERD_FILE); |
| 2288 | DBG3(" 3) %s", config.consumerd32_bin_path.value ? : "NULL"); |
| 2289 | if (stat(config.consumerd64_bin_path.value, &st) == 0) { |
| 2290 | DBG3("Found location #1"); |
| 2291 | consumer_to_use = config.consumerd64_bin_path.value; |
| 2292 | } else if (stat(INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE, &st) == 0) { |
| 2293 | DBG3("Found location #2"); |
| 2294 | consumer_to_use = INSTALL_BIN_PATH "/" DEFAULT_CONSUMERD_FILE; |
| 2295 | } else if (config.consumerd32_bin_path.value && |
| 2296 | stat(config.consumerd32_bin_path.value, &st) == 0) { |
| 2297 | DBG3("Found location #3"); |
| 2298 | consumer_to_use = config.consumerd32_bin_path.value; |
| 2299 | } else { |
| 2300 | DBG("Could not find any valid consumerd executable"); |
| 2301 | ret = -EINVAL; |
| 2302 | goto error; |
| 2303 | } |
| 2304 | DBG("Using kernel consumer at: %s", consumer_to_use); |
| 2305 | (void) execl(consumer_to_use, |
| 2306 | "lttng-consumerd", verbosity, "-k", |
| 2307 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
| 2308 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, |
| 2309 | "--group", config.tracing_group_name.value, |
| 2310 | NULL); |
| 2311 | break; |
| 2312 | case LTTNG_CONSUMER64_UST: |
| 2313 | { |
| 2314 | if (config.consumerd64_lib_dir.value) { |
| 2315 | char *tmp; |
| 2316 | size_t tmplen; |
| 2317 | char *tmpnew; |
| 2318 | |
| 2319 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
| 2320 | if (!tmp) { |
| 2321 | tmp = ""; |
| 2322 | } |
| 2323 | tmplen = strlen(config.consumerd64_lib_dir.value) + 1 /* : */ + strlen(tmp); |
| 2324 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
| 2325 | if (!tmpnew) { |
| 2326 | ret = -ENOMEM; |
| 2327 | goto error; |
| 2328 | } |
| 2329 | strcat(tmpnew, config.consumerd64_lib_dir.value); |
| 2330 | if (tmp[0] != '\0') { |
| 2331 | strcat(tmpnew, ":"); |
| 2332 | strcat(tmpnew, tmp); |
| 2333 | } |
| 2334 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); |
| 2335 | free(tmpnew); |
| 2336 | if (ret) { |
| 2337 | ret = -errno; |
| 2338 | goto error; |
| 2339 | } |
| 2340 | } |
| 2341 | DBG("Using 64-bit UST consumer at: %s", config.consumerd64_bin_path.value); |
| 2342 | (void) execl(config.consumerd64_bin_path.value, "lttng-consumerd", verbosity, "-u", |
| 2343 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
| 2344 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, |
| 2345 | "--group", config.tracing_group_name.value, |
| 2346 | NULL); |
| 2347 | break; |
| 2348 | } |
| 2349 | case LTTNG_CONSUMER32_UST: |
| 2350 | { |
| 2351 | if (config.consumerd32_lib_dir.value) { |
| 2352 | char *tmp; |
| 2353 | size_t tmplen; |
| 2354 | char *tmpnew; |
| 2355 | |
| 2356 | tmp = lttng_secure_getenv("LD_LIBRARY_PATH"); |
| 2357 | if (!tmp) { |
| 2358 | tmp = ""; |
| 2359 | } |
| 2360 | tmplen = strlen(config.consumerd32_lib_dir.value) + 1 /* : */ + strlen(tmp); |
| 2361 | tmpnew = zmalloc(tmplen + 1 /* \0 */); |
| 2362 | if (!tmpnew) { |
| 2363 | ret = -ENOMEM; |
| 2364 | goto error; |
| 2365 | } |
| 2366 | strcat(tmpnew, config.consumerd32_lib_dir.value); |
| 2367 | if (tmp[0] != '\0') { |
| 2368 | strcat(tmpnew, ":"); |
| 2369 | strcat(tmpnew, tmp); |
| 2370 | } |
| 2371 | ret = setenv("LD_LIBRARY_PATH", tmpnew, 1); |
| 2372 | free(tmpnew); |
| 2373 | if (ret) { |
| 2374 | ret = -errno; |
| 2375 | goto error; |
| 2376 | } |
| 2377 | } |
| 2378 | DBG("Using 32-bit UST consumer at: %s", config.consumerd32_bin_path.value); |
| 2379 | (void) execl(config.consumerd32_bin_path.value, "lttng-consumerd", verbosity, "-u", |
| 2380 | "--consumerd-cmd-sock", consumer_data->cmd_unix_sock_path, |
| 2381 | "--consumerd-err-sock", consumer_data->err_unix_sock_path, |
| 2382 | "--group", config.tracing_group_name.value, |
| 2383 | NULL); |
| 2384 | break; |
| 2385 | } |
| 2386 | default: |
| 2387 | ERR("unknown consumer type"); |
| 2388 | errno = 0; |
| 2389 | } |
| 2390 | if (errno != 0) { |
| 2391 | PERROR("Consumer execl()"); |
| 2392 | } |
| 2393 | /* Reaching this point, we got a failure on our execl(). */ |
| 2394 | exit(EXIT_FAILURE); |
| 2395 | } else if (pid > 0) { |
| 2396 | ret = pid; |
| 2397 | } else { |
| 2398 | PERROR("start consumer fork"); |
| 2399 | ret = -errno; |
| 2400 | } |
| 2401 | error: |
| 2402 | return ret; |
| 2403 | } |
| 2404 | |
| 2405 | /* |
| 2406 | * Spawn the consumerd daemon and session daemon thread. |
| 2407 | */ |
| 2408 | static int start_consumerd(struct consumer_data *consumer_data) |
| 2409 | { |
| 2410 | int ret; |
| 2411 | |
| 2412 | /* |
| 2413 | * Set the listen() state on the socket since there is a possible race |
| 2414 | * between the exec() of the consumer daemon and this call if place in the |
| 2415 | * consumer thread. See bug #366 for more details. |
| 2416 | */ |
| 2417 | ret = lttcomm_listen_unix_sock(consumer_data->err_sock); |
| 2418 | if (ret < 0) { |
| 2419 | goto error; |
| 2420 | } |
| 2421 | |
| 2422 | pthread_mutex_lock(&consumer_data->pid_mutex); |
| 2423 | if (consumer_data->pid != 0) { |
| 2424 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
| 2425 | goto end; |
| 2426 | } |
| 2427 | |
| 2428 | ret = spawn_consumerd(consumer_data); |
| 2429 | if (ret < 0) { |
| 2430 | ERR("Spawning consumerd failed"); |
| 2431 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
| 2432 | goto error; |
| 2433 | } |
| 2434 | |
| 2435 | /* Setting up the consumer_data pid */ |
| 2436 | consumer_data->pid = ret; |
| 2437 | DBG2("Consumer pid %d", consumer_data->pid); |
| 2438 | pthread_mutex_unlock(&consumer_data->pid_mutex); |
| 2439 | |
| 2440 | DBG2("Spawning consumer control thread"); |
| 2441 | ret = spawn_consumer_thread(consumer_data); |
| 2442 | if (ret < 0) { |
| 2443 | ERR("Fatal error spawning consumer control thread"); |
| 2444 | goto error; |
| 2445 | } |
| 2446 | |
| 2447 | end: |
| 2448 | return 0; |
| 2449 | |
| 2450 | error: |
| 2451 | /* Cleanup already created sockets on error. */ |
| 2452 | if (consumer_data->err_sock >= 0) { |
| 2453 | int err; |
| 2454 | |
| 2455 | err = close(consumer_data->err_sock); |
| 2456 | if (err < 0) { |
| 2457 | PERROR("close consumer data error socket"); |
| 2458 | } |
| 2459 | } |
| 2460 | return ret; |
| 2461 | } |
| 2462 | |
| 2463 | /* |
| 2464 | * Setup necessary data for kernel tracer action. |
| 2465 | */ |
| 2466 | static int init_kernel_tracer(void) |
| 2467 | { |
| 2468 | int ret; |
| 2469 | |
| 2470 | /* Modprobe lttng kernel modules */ |
| 2471 | ret = modprobe_lttng_control(); |
| 2472 | if (ret < 0) { |
| 2473 | goto error; |
| 2474 | } |
| 2475 | |
| 2476 | /* Open debugfs lttng */ |
| 2477 | kernel_tracer_fd = open(module_proc_lttng, O_RDWR); |
| 2478 | if (kernel_tracer_fd < 0) { |
| 2479 | DBG("Failed to open %s", module_proc_lttng); |
| 2480 | goto error_open; |
| 2481 | } |
| 2482 | |
| 2483 | /* Validate kernel version */ |
| 2484 | ret = kernel_validate_version(kernel_tracer_fd, &kernel_tracer_version, |
| 2485 | &kernel_tracer_abi_version); |
| 2486 | if (ret < 0) { |
| 2487 | goto error_version; |
| 2488 | } |
| 2489 | |
| 2490 | ret = modprobe_lttng_data(); |
| 2491 | if (ret < 0) { |
| 2492 | goto error_modules; |
| 2493 | } |
| 2494 | |
| 2495 | ret = kernel_supports_ring_buffer_snapshot_sample_positions( |
| 2496 | kernel_tracer_fd); |
| 2497 | if (ret < 0) { |
| 2498 | goto error_modules; |
| 2499 | } |
| 2500 | |
| 2501 | if (ret < 1) { |
| 2502 | WARN("Kernel tracer does not support buffer monitoring. " |
| 2503 | "The monitoring timer of channels in the kernel domain " |
| 2504 | "will be set to 0 (disabled)."); |
| 2505 | } |
| 2506 | |
| 2507 | DBG("Kernel tracer fd %d", kernel_tracer_fd); |
| 2508 | return 0; |
| 2509 | |
| 2510 | error_version: |
| 2511 | modprobe_remove_lttng_control(); |
| 2512 | ret = close(kernel_tracer_fd); |
| 2513 | if (ret) { |
| 2514 | PERROR("close"); |
| 2515 | } |
| 2516 | kernel_tracer_fd = -1; |
| 2517 | return LTTNG_ERR_KERN_VERSION; |
| 2518 | |
| 2519 | error_modules: |
| 2520 | ret = close(kernel_tracer_fd); |
| 2521 | if (ret) { |
| 2522 | PERROR("close"); |
| 2523 | } |
| 2524 | |
| 2525 | error_open: |
| 2526 | modprobe_remove_lttng_control(); |
| 2527 | |
| 2528 | error: |
| 2529 | WARN("No kernel tracer available"); |
| 2530 | kernel_tracer_fd = -1; |
| 2531 | if (!is_root) { |
| 2532 | return LTTNG_ERR_NEED_ROOT_SESSIOND; |
| 2533 | } else { |
| 2534 | return LTTNG_ERR_KERN_NA; |
| 2535 | } |
| 2536 | } |
| 2537 | |
| 2538 | |
| 2539 | /* |
| 2540 | * Copy consumer output from the tracing session to the domain session. The |
| 2541 | * function also applies the right modification on a per domain basis for the |
| 2542 | * trace files destination directory. |
| 2543 | * |
| 2544 | * Should *NOT* be called with RCU read-side lock held. |
| 2545 | */ |
| 2546 | static int copy_session_consumer(int domain, struct ltt_session *session) |
| 2547 | { |
| 2548 | int ret; |
| 2549 | const char *dir_name; |
| 2550 | struct consumer_output *consumer; |
| 2551 | |
| 2552 | assert(session); |
| 2553 | assert(session->consumer); |
| 2554 | |
| 2555 | switch (domain) { |
| 2556 | case LTTNG_DOMAIN_KERNEL: |
| 2557 | DBG3("Copying tracing session consumer output in kernel session"); |
| 2558 | /* |
| 2559 | * XXX: We should audit the session creation and what this function |
| 2560 | * does "extra" in order to avoid a destroy since this function is used |
| 2561 | * in the domain session creation (kernel and ust) only. Same for UST |
| 2562 | * domain. |
| 2563 | */ |
| 2564 | if (session->kernel_session->consumer) { |
| 2565 | consumer_output_put(session->kernel_session->consumer); |
| 2566 | } |
| 2567 | session->kernel_session->consumer = |
| 2568 | consumer_copy_output(session->consumer); |
| 2569 | /* Ease our life a bit for the next part */ |
| 2570 | consumer = session->kernel_session->consumer; |
| 2571 | dir_name = DEFAULT_KERNEL_TRACE_DIR; |
| 2572 | break; |
| 2573 | case LTTNG_DOMAIN_JUL: |
| 2574 | case LTTNG_DOMAIN_LOG4J: |
| 2575 | case LTTNG_DOMAIN_PYTHON: |
| 2576 | case LTTNG_DOMAIN_UST: |
| 2577 | DBG3("Copying tracing session consumer output in UST session"); |
| 2578 | if (session->ust_session->consumer) { |
| 2579 | consumer_output_put(session->ust_session->consumer); |
| 2580 | } |
| 2581 | session->ust_session->consumer = |
| 2582 | consumer_copy_output(session->consumer); |
| 2583 | /* Ease our life a bit for the next part */ |
| 2584 | consumer = session->ust_session->consumer; |
| 2585 | dir_name = DEFAULT_UST_TRACE_DIR; |
| 2586 | break; |
| 2587 | default: |
| 2588 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
| 2589 | goto error; |
| 2590 | } |
| 2591 | |
| 2592 | /* Append correct directory to subdir */ |
| 2593 | strncat(consumer->subdir, dir_name, |
| 2594 | sizeof(consumer->subdir) - strlen(consumer->subdir) - 1); |
| 2595 | DBG3("Copy session consumer subdir %s", consumer->subdir); |
| 2596 | |
| 2597 | ret = LTTNG_OK; |
| 2598 | |
| 2599 | error: |
| 2600 | return ret; |
| 2601 | } |
| 2602 | |
| 2603 | /* |
| 2604 | * Create an UST session and add it to the session ust list. |
| 2605 | * |
| 2606 | * Should *NOT* be called with RCU read-side lock held. |
| 2607 | */ |
| 2608 | static int create_ust_session(struct ltt_session *session, |
| 2609 | struct lttng_domain *domain) |
| 2610 | { |
| 2611 | int ret; |
| 2612 | struct ltt_ust_session *lus = NULL; |
| 2613 | |
| 2614 | assert(session); |
| 2615 | assert(domain); |
| 2616 | assert(session->consumer); |
| 2617 | |
| 2618 | switch (domain->type) { |
| 2619 | case LTTNG_DOMAIN_JUL: |
| 2620 | case LTTNG_DOMAIN_LOG4J: |
| 2621 | case LTTNG_DOMAIN_PYTHON: |
| 2622 | case LTTNG_DOMAIN_UST: |
| 2623 | break; |
| 2624 | default: |
| 2625 | ERR("Unknown UST domain on create session %d", domain->type); |
| 2626 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
| 2627 | goto error; |
| 2628 | } |
| 2629 | |
| 2630 | DBG("Creating UST session"); |
| 2631 | |
| 2632 | lus = trace_ust_create_session(session->id); |
| 2633 | if (lus == NULL) { |
| 2634 | ret = LTTNG_ERR_UST_SESS_FAIL; |
| 2635 | goto error; |
| 2636 | } |
| 2637 | |
| 2638 | lus->uid = session->uid; |
| 2639 | lus->gid = session->gid; |
| 2640 | lus->output_traces = session->output_traces; |
| 2641 | lus->snapshot_mode = session->snapshot_mode; |
| 2642 | lus->live_timer_interval = session->live_timer; |
| 2643 | session->ust_session = lus; |
| 2644 | if (session->shm_path[0]) { |
| 2645 | strncpy(lus->root_shm_path, session->shm_path, |
| 2646 | sizeof(lus->root_shm_path)); |
| 2647 | lus->root_shm_path[sizeof(lus->root_shm_path) - 1] = '\0'; |
| 2648 | strncpy(lus->shm_path, session->shm_path, |
| 2649 | sizeof(lus->shm_path)); |
| 2650 | lus->shm_path[sizeof(lus->shm_path) - 1] = '\0'; |
| 2651 | strncat(lus->shm_path, "/ust", |
| 2652 | sizeof(lus->shm_path) - strlen(lus->shm_path) - 1); |
| 2653 | } |
| 2654 | /* Copy session output to the newly created UST session */ |
| 2655 | ret = copy_session_consumer(domain->type, session); |
| 2656 | if (ret != LTTNG_OK) { |
| 2657 | goto error; |
| 2658 | } |
| 2659 | |
| 2660 | return LTTNG_OK; |
| 2661 | |
| 2662 | error: |
| 2663 | free(lus); |
| 2664 | session->ust_session = NULL; |
| 2665 | return ret; |
| 2666 | } |
| 2667 | |
| 2668 | /* |
| 2669 | * Create a kernel tracer session then create the default channel. |
| 2670 | */ |
| 2671 | static int create_kernel_session(struct ltt_session *session) |
| 2672 | { |
| 2673 | int ret; |
| 2674 | |
| 2675 | DBG("Creating kernel session"); |
| 2676 | |
| 2677 | ret = kernel_create_session(session, kernel_tracer_fd); |
| 2678 | if (ret < 0) { |
| 2679 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
| 2680 | goto error; |
| 2681 | } |
| 2682 | |
| 2683 | /* Code flow safety */ |
| 2684 | assert(session->kernel_session); |
| 2685 | |
| 2686 | /* Copy session output to the newly created Kernel session */ |
| 2687 | ret = copy_session_consumer(LTTNG_DOMAIN_KERNEL, session); |
| 2688 | if (ret != LTTNG_OK) { |
| 2689 | goto error; |
| 2690 | } |
| 2691 | |
| 2692 | session->kernel_session->uid = session->uid; |
| 2693 | session->kernel_session->gid = session->gid; |
| 2694 | session->kernel_session->output_traces = session->output_traces; |
| 2695 | session->kernel_session->snapshot_mode = session->snapshot_mode; |
| 2696 | |
| 2697 | return LTTNG_OK; |
| 2698 | |
| 2699 | error: |
| 2700 | trace_kernel_destroy_session(session->kernel_session); |
| 2701 | session->kernel_session = NULL; |
| 2702 | return ret; |
| 2703 | } |
| 2704 | |
| 2705 | /* |
| 2706 | * Count number of session permitted by uid/gid. |
| 2707 | */ |
| 2708 | static unsigned int lttng_sessions_count(uid_t uid, gid_t gid) |
| 2709 | { |
| 2710 | unsigned int i = 0; |
| 2711 | struct ltt_session *session; |
| 2712 | const struct ltt_session_list *session_list = session_get_list(); |
| 2713 | |
| 2714 | DBG("Counting number of available session for UID %d GID %d", |
| 2715 | uid, gid); |
| 2716 | cds_list_for_each_entry(session, &session_list->head, list) { |
| 2717 | if (!session_get(session)) { |
| 2718 | continue; |
| 2719 | } |
| 2720 | session_lock(session); |
| 2721 | /* Only count the sessions the user can control. */ |
| 2722 | if (session_access_ok(session, uid, gid) && |
| 2723 | !session->destroyed) { |
| 2724 | i++; |
| 2725 | } |
| 2726 | session_unlock(session); |
| 2727 | session_put(session); |
| 2728 | } |
| 2729 | return i; |
| 2730 | } |
| 2731 | |
| 2732 | static int receive_userspace_probe(struct command_ctx *cmd_ctx, int sock, |
| 2733 | int *sock_error, struct lttng_event *event) |
| 2734 | { |
| 2735 | int fd, ret; |
| 2736 | struct lttng_userspace_probe_location *probe_location; |
| 2737 | const struct lttng_userspace_probe_location_lookup_method *lookup = NULL; |
| 2738 | struct lttng_dynamic_buffer probe_location_buffer; |
| 2739 | struct lttng_buffer_view buffer_view; |
| 2740 | |
| 2741 | /* |
| 2742 | * Create a buffer to store the serialized version of the probe |
| 2743 | * location. |
| 2744 | */ |
| 2745 | lttng_dynamic_buffer_init(&probe_location_buffer); |
| 2746 | ret = lttng_dynamic_buffer_set_size(&probe_location_buffer, |
| 2747 | cmd_ctx->lsm->u.enable.userspace_probe_location_len); |
| 2748 | if (ret) { |
| 2749 | ret = LTTNG_ERR_NOMEM; |
| 2750 | goto error; |
| 2751 | } |
| 2752 | |
| 2753 | /* |
| 2754 | * Receive the probe location. |
| 2755 | */ |
| 2756 | ret = lttcomm_recv_unix_sock(sock, probe_location_buffer.data, |
| 2757 | probe_location_buffer.size); |
| 2758 | if (ret <= 0) { |
| 2759 | DBG("Nothing recv() from client var len data... continuing"); |
| 2760 | *sock_error = 1; |
| 2761 | lttng_dynamic_buffer_reset(&probe_location_buffer); |
| 2762 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 2763 | goto error; |
| 2764 | } |
| 2765 | |
| 2766 | buffer_view = lttng_buffer_view_from_dynamic_buffer( |
| 2767 | &probe_location_buffer, 0, probe_location_buffer.size); |
| 2768 | |
| 2769 | /* |
| 2770 | * Extract the probe location from the serialized version. |
| 2771 | */ |
| 2772 | ret = lttng_userspace_probe_location_create_from_buffer( |
| 2773 | &buffer_view, &probe_location); |
| 2774 | if (ret < 0) { |
| 2775 | WARN("Failed to create a userspace probe location from the received buffer"); |
| 2776 | lttng_dynamic_buffer_reset( &probe_location_buffer); |
| 2777 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 2778 | goto error; |
| 2779 | } |
| 2780 | |
| 2781 | /* |
| 2782 | * Receive the file descriptor to the target binary from the client. |
| 2783 | */ |
| 2784 | DBG("Receiving userspace probe target FD from client ..."); |
| 2785 | ret = lttcomm_recv_fds_unix_sock(sock, &fd, 1); |
| 2786 | if (ret <= 0) { |
| 2787 | DBG("Nothing recv() from client userspace probe fd... continuing"); |
| 2788 | *sock_error = 1; |
| 2789 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 2790 | goto error; |
| 2791 | } |
| 2792 | |
| 2793 | /* |
| 2794 | * Set the file descriptor received from the client through the unix |
| 2795 | * socket in the probe location. |
| 2796 | */ |
| 2797 | lookup = lttng_userspace_probe_location_get_lookup_method(probe_location); |
| 2798 | if (!lookup) { |
| 2799 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 2800 | goto error; |
| 2801 | } |
| 2802 | |
| 2803 | /* |
| 2804 | * From the kernel tracer's perspective, all userspace probe event types |
| 2805 | * are all the same: a file and an offset. |
| 2806 | */ |
| 2807 | switch (lttng_userspace_probe_location_lookup_method_get_type(lookup)) { |
| 2808 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_FUNCTION_ELF: |
| 2809 | ret = lttng_userspace_probe_location_function_set_binary_fd( |
| 2810 | probe_location, fd); |
| 2811 | break; |
| 2812 | case LTTNG_USERSPACE_PROBE_LOCATION_LOOKUP_METHOD_TYPE_TRACEPOINT_SDT: |
| 2813 | ret = lttng_userspace_probe_location_tracepoint_set_binary_fd( |
| 2814 | probe_location, fd); |
| 2815 | break; |
| 2816 | default: |
| 2817 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 2818 | goto error; |
| 2819 | } |
| 2820 | |
| 2821 | if (ret) { |
| 2822 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 2823 | goto error; |
| 2824 | } |
| 2825 | |
| 2826 | /* Attach the probe location to the event. */ |
| 2827 | ret = lttng_event_set_userspace_probe_location(event, probe_location); |
| 2828 | if (ret) { |
| 2829 | ret = LTTNG_ERR_PROBE_LOCATION_INVAL; |
| 2830 | goto error; |
| 2831 | } |
| 2832 | |
| 2833 | lttng_dynamic_buffer_reset(&probe_location_buffer); |
| 2834 | error: |
| 2835 | return ret; |
| 2836 | } |
| 2837 | |
| 2838 | /* |
| 2839 | * Check if the current kernel tracer supports the session rotation feature. |
| 2840 | * Return 1 if it does, 0 otherwise. |
| 2841 | */ |
| 2842 | static int check_rotate_compatible(void) |
| 2843 | { |
| 2844 | int ret = 1; |
| 2845 | |
| 2846 | if (kernel_tracer_version.major != 2 || kernel_tracer_version.minor < 11) { |
| 2847 | DBG("Kernel tracer version is not compatible with the rotation feature"); |
| 2848 | ret = 0; |
| 2849 | } |
| 2850 | |
| 2851 | return ret; |
| 2852 | } |
| 2853 | |
| 2854 | /* |
| 2855 | * Process the command requested by the lttng client within the command |
| 2856 | * context structure. This function make sure that the return structure (llm) |
| 2857 | * is set and ready for transmission before returning. |
| 2858 | * |
| 2859 | * Return any error encountered or 0 for success. |
| 2860 | * |
| 2861 | * "sock" is only used for special-case var. len data. |
| 2862 | * |
| 2863 | * Should *NOT* be called with RCU read-side lock held. |
| 2864 | */ |
| 2865 | static int process_client_msg(struct command_ctx *cmd_ctx, int sock, |
| 2866 | int *sock_error) |
| 2867 | { |
| 2868 | int ret = LTTNG_OK; |
| 2869 | int need_tracing_session = 1; |
| 2870 | int need_domain; |
| 2871 | |
| 2872 | DBG("Processing client command %d", cmd_ctx->lsm->cmd_type); |
| 2873 | |
| 2874 | assert(!rcu_read_ongoing()); |
| 2875 | |
| 2876 | *sock_error = 0; |
| 2877 | |
| 2878 | switch (cmd_ctx->lsm->cmd_type) { |
| 2879 | case LTTNG_CREATE_SESSION: |
| 2880 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
| 2881 | case LTTNG_CREATE_SESSION_LIVE: |
| 2882 | case LTTNG_DESTROY_SESSION: |
| 2883 | case LTTNG_LIST_SESSIONS: |
| 2884 | case LTTNG_LIST_DOMAINS: |
| 2885 | case LTTNG_START_TRACE: |
| 2886 | case LTTNG_STOP_TRACE: |
| 2887 | case LTTNG_DATA_PENDING: |
| 2888 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
| 2889 | case LTTNG_SNAPSHOT_DEL_OUTPUT: |
| 2890 | case LTTNG_SNAPSHOT_LIST_OUTPUT: |
| 2891 | case LTTNG_SNAPSHOT_RECORD: |
| 2892 | case LTTNG_SAVE_SESSION: |
| 2893 | case LTTNG_SET_SESSION_SHM_PATH: |
| 2894 | case LTTNG_REGENERATE_METADATA: |
| 2895 | case LTTNG_REGENERATE_STATEDUMP: |
| 2896 | case LTTNG_REGISTER_TRIGGER: |
| 2897 | case LTTNG_UNREGISTER_TRIGGER: |
| 2898 | case LTTNG_ROTATE_SESSION: |
| 2899 | case LTTNG_ROTATION_GET_INFO: |
| 2900 | case LTTNG_ROTATION_SET_SCHEDULE: |
| 2901 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
| 2902 | need_domain = 0; |
| 2903 | break; |
| 2904 | default: |
| 2905 | need_domain = 1; |
| 2906 | } |
| 2907 | |
| 2908 | if (config.no_kernel && need_domain |
| 2909 | && cmd_ctx->lsm->domain.type == LTTNG_DOMAIN_KERNEL) { |
| 2910 | if (!is_root) { |
| 2911 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
| 2912 | } else { |
| 2913 | ret = LTTNG_ERR_KERN_NA; |
| 2914 | } |
| 2915 | goto error; |
| 2916 | } |
| 2917 | |
| 2918 | /* Deny register consumer if we already have a spawned consumer. */ |
| 2919 | if (cmd_ctx->lsm->cmd_type == LTTNG_REGISTER_CONSUMER) { |
| 2920 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
| 2921 | if (kconsumer_data.pid > 0) { |
| 2922 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
| 2923 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
| 2924 | goto error; |
| 2925 | } |
| 2926 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
| 2927 | } |
| 2928 | |
| 2929 | /* |
| 2930 | * Check for command that don't needs to allocate a returned payload. We do |
| 2931 | * this here so we don't have to make the call for no payload at each |
| 2932 | * command. |
| 2933 | */ |
| 2934 | switch(cmd_ctx->lsm->cmd_type) { |
| 2935 | case LTTNG_LIST_SESSIONS: |
| 2936 | case LTTNG_LIST_TRACEPOINTS: |
| 2937 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
| 2938 | case LTTNG_LIST_DOMAINS: |
| 2939 | case LTTNG_LIST_CHANNELS: |
| 2940 | case LTTNG_LIST_EVENTS: |
| 2941 | case LTTNG_LIST_SYSCALLS: |
| 2942 | case LTTNG_LIST_TRACKER_PIDS: |
| 2943 | case LTTNG_DATA_PENDING: |
| 2944 | case LTTNG_ROTATE_SESSION: |
| 2945 | case LTTNG_ROTATION_GET_INFO: |
| 2946 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
| 2947 | break; |
| 2948 | default: |
| 2949 | /* Setup lttng message with no payload */ |
| 2950 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0); |
| 2951 | if (ret < 0) { |
| 2952 | /* This label does not try to unlock the session */ |
| 2953 | goto init_setup_error; |
| 2954 | } |
| 2955 | } |
| 2956 | |
| 2957 | /* Commands that DO NOT need a session. */ |
| 2958 | switch (cmd_ctx->lsm->cmd_type) { |
| 2959 | case LTTNG_CREATE_SESSION: |
| 2960 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
| 2961 | case LTTNG_CREATE_SESSION_LIVE: |
| 2962 | case LTTNG_LIST_SESSIONS: |
| 2963 | case LTTNG_LIST_TRACEPOINTS: |
| 2964 | case LTTNG_LIST_SYSCALLS: |
| 2965 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
| 2966 | case LTTNG_SAVE_SESSION: |
| 2967 | case LTTNG_REGISTER_TRIGGER: |
| 2968 | case LTTNG_UNREGISTER_TRIGGER: |
| 2969 | need_tracing_session = 0; |
| 2970 | break; |
| 2971 | default: |
| 2972 | DBG("Getting session %s by name", cmd_ctx->lsm->session.name); |
| 2973 | /* |
| 2974 | * We keep the session list lock across _all_ commands |
| 2975 | * for now, because the per-session lock does not |
| 2976 | * handle teardown properly. |
| 2977 | */ |
| 2978 | session_lock_list(); |
| 2979 | cmd_ctx->session = session_find_by_name(cmd_ctx->lsm->session.name); |
| 2980 | if (cmd_ctx->session == NULL) { |
| 2981 | ret = LTTNG_ERR_SESS_NOT_FOUND; |
| 2982 | goto error; |
| 2983 | } else { |
| 2984 | /* Acquire lock for the session */ |
| 2985 | session_lock(cmd_ctx->session); |
| 2986 | } |
| 2987 | break; |
| 2988 | } |
| 2989 | |
| 2990 | /* |
| 2991 | * Commands that need a valid session but should NOT create one if none |
| 2992 | * exists. Instead of creating one and destroying it when the command is |
| 2993 | * handled, process that right before so we save some round trip in useless |
| 2994 | * code path. |
| 2995 | */ |
| 2996 | switch (cmd_ctx->lsm->cmd_type) { |
| 2997 | case LTTNG_DISABLE_CHANNEL: |
| 2998 | case LTTNG_DISABLE_EVENT: |
| 2999 | switch (cmd_ctx->lsm->domain.type) { |
| 3000 | case LTTNG_DOMAIN_KERNEL: |
| 3001 | if (!cmd_ctx->session->kernel_session) { |
| 3002 | ret = LTTNG_ERR_NO_CHANNEL; |
| 3003 | goto error; |
| 3004 | } |
| 3005 | break; |
| 3006 | case LTTNG_DOMAIN_JUL: |
| 3007 | case LTTNG_DOMAIN_LOG4J: |
| 3008 | case LTTNG_DOMAIN_PYTHON: |
| 3009 | case LTTNG_DOMAIN_UST: |
| 3010 | if (!cmd_ctx->session->ust_session) { |
| 3011 | ret = LTTNG_ERR_NO_CHANNEL; |
| 3012 | goto error; |
| 3013 | } |
| 3014 | break; |
| 3015 | default: |
| 3016 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
| 3017 | goto error; |
| 3018 | } |
| 3019 | default: |
| 3020 | break; |
| 3021 | } |
| 3022 | |
| 3023 | if (!need_domain) { |
| 3024 | goto skip_domain; |
| 3025 | } |
| 3026 | |
| 3027 | /* |
| 3028 | * Check domain type for specific "pre-action". |
| 3029 | */ |
| 3030 | switch (cmd_ctx->lsm->domain.type) { |
| 3031 | case LTTNG_DOMAIN_KERNEL: |
| 3032 | if (!is_root) { |
| 3033 | ret = LTTNG_ERR_NEED_ROOT_SESSIOND; |
| 3034 | goto error; |
| 3035 | } |
| 3036 | |
| 3037 | /* Kernel tracer check */ |
| 3038 | if (kernel_tracer_fd == -1) { |
| 3039 | /* Basically, load kernel tracer modules */ |
| 3040 | ret = init_kernel_tracer(); |
| 3041 | if (ret != 0) { |
| 3042 | goto error; |
| 3043 | } |
| 3044 | } |
| 3045 | |
| 3046 | /* Consumer is in an ERROR state. Report back to client */ |
| 3047 | if (uatomic_read(&kernel_consumerd_state) == CONSUMER_ERROR) { |
| 3048 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
| 3049 | goto error; |
| 3050 | } |
| 3051 | |
| 3052 | /* Need a session for kernel command */ |
| 3053 | if (need_tracing_session) { |
| 3054 | if (cmd_ctx->session->kernel_session == NULL) { |
| 3055 | ret = create_kernel_session(cmd_ctx->session); |
| 3056 | if (ret < 0) { |
| 3057 | ret = LTTNG_ERR_KERN_SESS_FAIL; |
| 3058 | goto error; |
| 3059 | } |
| 3060 | } |
| 3061 | |
| 3062 | /* Start the kernel consumer daemon */ |
| 3063 | pthread_mutex_lock(&kconsumer_data.pid_mutex); |
| 3064 | if (kconsumer_data.pid == 0 && |
| 3065 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
| 3066 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
| 3067 | ret = start_consumerd(&kconsumer_data); |
| 3068 | if (ret < 0) { |
| 3069 | ret = LTTNG_ERR_KERN_CONSUMER_FAIL; |
| 3070 | goto error; |
| 3071 | } |
| 3072 | uatomic_set(&kernel_consumerd_state, CONSUMER_STARTED); |
| 3073 | } else { |
| 3074 | pthread_mutex_unlock(&kconsumer_data.pid_mutex); |
| 3075 | } |
| 3076 | |
| 3077 | /* |
| 3078 | * The consumer was just spawned so we need to add the socket to |
| 3079 | * the consumer output of the session if exist. |
| 3080 | */ |
| 3081 | ret = consumer_create_socket(&kconsumer_data, |
| 3082 | cmd_ctx->session->kernel_session->consumer); |
| 3083 | if (ret < 0) { |
| 3084 | goto error; |
| 3085 | } |
| 3086 | } |
| 3087 | |
| 3088 | break; |
| 3089 | case LTTNG_DOMAIN_JUL: |
| 3090 | case LTTNG_DOMAIN_LOG4J: |
| 3091 | case LTTNG_DOMAIN_PYTHON: |
| 3092 | case LTTNG_DOMAIN_UST: |
| 3093 | { |
| 3094 | if (!ust_app_supported()) { |
| 3095 | ret = LTTNG_ERR_NO_UST; |
| 3096 | goto error; |
| 3097 | } |
| 3098 | /* Consumer is in an ERROR state. Report back to client */ |
| 3099 | if (uatomic_read(&ust_consumerd_state) == CONSUMER_ERROR) { |
| 3100 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
| 3101 | goto error; |
| 3102 | } |
| 3103 | |
| 3104 | if (need_tracing_session) { |
| 3105 | /* Create UST session if none exist. */ |
| 3106 | if (cmd_ctx->session->ust_session == NULL) { |
| 3107 | ret = create_ust_session(cmd_ctx->session, |
| 3108 | &cmd_ctx->lsm->domain); |
| 3109 | if (ret != LTTNG_OK) { |
| 3110 | goto error; |
| 3111 | } |
| 3112 | } |
| 3113 | |
| 3114 | /* Start the UST consumer daemons */ |
| 3115 | /* 64-bit */ |
| 3116 | pthread_mutex_lock(&ustconsumer64_data.pid_mutex); |
| 3117 | if (config.consumerd64_bin_path.value && |
| 3118 | ustconsumer64_data.pid == 0 && |
| 3119 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
| 3120 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
| 3121 | ret = start_consumerd(&ustconsumer64_data); |
| 3122 | if (ret < 0) { |
| 3123 | ret = LTTNG_ERR_UST_CONSUMER64_FAIL; |
| 3124 | uatomic_set(&ust_consumerd64_fd, -EINVAL); |
| 3125 | goto error; |
| 3126 | } |
| 3127 | |
| 3128 | uatomic_set(&ust_consumerd64_fd, ustconsumer64_data.cmd_sock); |
| 3129 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
| 3130 | } else { |
| 3131 | pthread_mutex_unlock(&ustconsumer64_data.pid_mutex); |
| 3132 | } |
| 3133 | |
| 3134 | /* |
| 3135 | * Setup socket for consumer 64 bit. No need for atomic access |
| 3136 | * since it was set above and can ONLY be set in this thread. |
| 3137 | */ |
| 3138 | ret = consumer_create_socket(&ustconsumer64_data, |
| 3139 | cmd_ctx->session->ust_session->consumer); |
| 3140 | if (ret < 0) { |
| 3141 | goto error; |
| 3142 | } |
| 3143 | |
| 3144 | /* 32-bit */ |
| 3145 | pthread_mutex_lock(&ustconsumer32_data.pid_mutex); |
| 3146 | if (config.consumerd32_bin_path.value && |
| 3147 | ustconsumer32_data.pid == 0 && |
| 3148 | cmd_ctx->lsm->cmd_type != LTTNG_REGISTER_CONSUMER) { |
| 3149 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
| 3150 | ret = start_consumerd(&ustconsumer32_data); |
| 3151 | if (ret < 0) { |
| 3152 | ret = LTTNG_ERR_UST_CONSUMER32_FAIL; |
| 3153 | uatomic_set(&ust_consumerd32_fd, -EINVAL); |
| 3154 | goto error; |
| 3155 | } |
| 3156 | |
| 3157 | uatomic_set(&ust_consumerd32_fd, ustconsumer32_data.cmd_sock); |
| 3158 | uatomic_set(&ust_consumerd_state, CONSUMER_STARTED); |
| 3159 | } else { |
| 3160 | pthread_mutex_unlock(&ustconsumer32_data.pid_mutex); |
| 3161 | } |
| 3162 | |
| 3163 | /* |
| 3164 | * Setup socket for consumer 32 bit. No need for atomic access |
| 3165 | * since it was set above and can ONLY be set in this thread. |
| 3166 | */ |
| 3167 | ret = consumer_create_socket(&ustconsumer32_data, |
| 3168 | cmd_ctx->session->ust_session->consumer); |
| 3169 | if (ret < 0) { |
| 3170 | goto error; |
| 3171 | } |
| 3172 | } |
| 3173 | break; |
| 3174 | } |
| 3175 | default: |
| 3176 | break; |
| 3177 | } |
| 3178 | skip_domain: |
| 3179 | |
| 3180 | /* Validate consumer daemon state when start/stop trace command */ |
| 3181 | if (cmd_ctx->lsm->cmd_type == LTTNG_START_TRACE || |
| 3182 | cmd_ctx->lsm->cmd_type == LTTNG_STOP_TRACE) { |
| 3183 | switch (cmd_ctx->lsm->domain.type) { |
| 3184 | case LTTNG_DOMAIN_NONE: |
| 3185 | break; |
| 3186 | case LTTNG_DOMAIN_JUL: |
| 3187 | case LTTNG_DOMAIN_LOG4J: |
| 3188 | case LTTNG_DOMAIN_PYTHON: |
| 3189 | case LTTNG_DOMAIN_UST: |
| 3190 | if (uatomic_read(&ust_consumerd_state) != CONSUMER_STARTED) { |
| 3191 | ret = LTTNG_ERR_NO_USTCONSUMERD; |
| 3192 | goto error; |
| 3193 | } |
| 3194 | break; |
| 3195 | case LTTNG_DOMAIN_KERNEL: |
| 3196 | if (uatomic_read(&kernel_consumerd_state) != CONSUMER_STARTED) { |
| 3197 | ret = LTTNG_ERR_NO_KERNCONSUMERD; |
| 3198 | goto error; |
| 3199 | } |
| 3200 | break; |
| 3201 | default: |
| 3202 | ret = LTTNG_ERR_UNKNOWN_DOMAIN; |
| 3203 | goto error; |
| 3204 | } |
| 3205 | } |
| 3206 | |
| 3207 | /* |
| 3208 | * Check that the UID or GID match that of the tracing session. |
| 3209 | * The root user can interact with all sessions. |
| 3210 | */ |
| 3211 | if (need_tracing_session) { |
| 3212 | if (!session_access_ok(cmd_ctx->session, |
| 3213 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
| 3214 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)) || |
| 3215 | cmd_ctx->session->destroyed) { |
| 3216 | ret = LTTNG_ERR_EPERM; |
| 3217 | goto error; |
| 3218 | } |
| 3219 | } |
| 3220 | |
| 3221 | /* |
| 3222 | * Send relayd information to consumer as soon as we have a domain and a |
| 3223 | * session defined. |
| 3224 | */ |
| 3225 | if (cmd_ctx->session && need_domain) { |
| 3226 | /* |
| 3227 | * Setup relayd if not done yet. If the relayd information was already |
| 3228 | * sent to the consumer, this call will gracefully return. |
| 3229 | */ |
| 3230 | ret = cmd_setup_relayd(cmd_ctx->session); |
| 3231 | if (ret != LTTNG_OK) { |
| 3232 | goto error; |
| 3233 | } |
| 3234 | } |
| 3235 | |
| 3236 | /* Process by command type */ |
| 3237 | switch (cmd_ctx->lsm->cmd_type) { |
| 3238 | case LTTNG_ADD_CONTEXT: |
| 3239 | { |
| 3240 | /* |
| 3241 | * An LTTNG_ADD_CONTEXT command might have a supplementary |
| 3242 | * payload if the context being added is an application context. |
| 3243 | */ |
| 3244 | if (cmd_ctx->lsm->u.context.ctx.ctx == |
| 3245 | LTTNG_EVENT_CONTEXT_APP_CONTEXT) { |
| 3246 | char *provider_name = NULL, *context_name = NULL; |
| 3247 | size_t provider_name_len = |
| 3248 | cmd_ctx->lsm->u.context.provider_name_len; |
| 3249 | size_t context_name_len = |
| 3250 | cmd_ctx->lsm->u.context.context_name_len; |
| 3251 | |
| 3252 | if (provider_name_len == 0 || context_name_len == 0) { |
| 3253 | /* |
| 3254 | * Application provider and context names MUST |
| 3255 | * be provided. |
| 3256 | */ |
| 3257 | ret = -LTTNG_ERR_INVALID; |
| 3258 | goto error; |
| 3259 | } |
| 3260 | |
| 3261 | provider_name = zmalloc(provider_name_len + 1); |
| 3262 | if (!provider_name) { |
| 3263 | ret = -LTTNG_ERR_NOMEM; |
| 3264 | goto error; |
| 3265 | } |
| 3266 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = |
| 3267 | provider_name; |
| 3268 | |
| 3269 | context_name = zmalloc(context_name_len + 1); |
| 3270 | if (!context_name) { |
| 3271 | ret = -LTTNG_ERR_NOMEM; |
| 3272 | goto error_add_context; |
| 3273 | } |
| 3274 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = |
| 3275 | context_name; |
| 3276 | |
| 3277 | ret = lttcomm_recv_unix_sock(sock, provider_name, |
| 3278 | provider_name_len); |
| 3279 | if (ret < 0) { |
| 3280 | goto error_add_context; |
| 3281 | } |
| 3282 | |
| 3283 | ret = lttcomm_recv_unix_sock(sock, context_name, |
| 3284 | context_name_len); |
| 3285 | if (ret < 0) { |
| 3286 | goto error_add_context; |
| 3287 | } |
| 3288 | } |
| 3289 | |
| 3290 | /* |
| 3291 | * cmd_add_context assumes ownership of the provider and context |
| 3292 | * names. |
| 3293 | */ |
| 3294 | ret = cmd_add_context(cmd_ctx->session, |
| 3295 | cmd_ctx->lsm->domain.type, |
| 3296 | cmd_ctx->lsm->u.context.channel_name, |
| 3297 | &cmd_ctx->lsm->u.context.ctx, |
| 3298 | kernel_poll_pipe[1]); |
| 3299 | |
| 3300 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name = NULL; |
| 3301 | cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name = NULL; |
| 3302 | error_add_context: |
| 3303 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.provider_name); |
| 3304 | free(cmd_ctx->lsm->u.context.ctx.u.app_ctx.ctx_name); |
| 3305 | if (ret < 0) { |
| 3306 | goto error; |
| 3307 | } |
| 3308 | break; |
| 3309 | } |
| 3310 | case LTTNG_DISABLE_CHANNEL: |
| 3311 | { |
| 3312 | ret = cmd_disable_channel(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 3313 | cmd_ctx->lsm->u.disable.channel_name); |
| 3314 | break; |
| 3315 | } |
| 3316 | case LTTNG_DISABLE_EVENT: |
| 3317 | { |
| 3318 | |
| 3319 | /* |
| 3320 | * FIXME: handle filter; for now we just receive the filter's |
| 3321 | * bytecode along with the filter expression which are sent by |
| 3322 | * liblttng-ctl and discard them. |
| 3323 | * |
| 3324 | * This fixes an issue where the client may block while sending |
| 3325 | * the filter payload and encounter an error because the session |
| 3326 | * daemon closes the socket without ever handling this data. |
| 3327 | */ |
| 3328 | size_t count = cmd_ctx->lsm->u.disable.expression_len + |
| 3329 | cmd_ctx->lsm->u.disable.bytecode_len; |
| 3330 | |
| 3331 | if (count) { |
| 3332 | char data[LTTNG_FILTER_MAX_LEN]; |
| 3333 | |
| 3334 | DBG("Discarding disable event command payload of size %zu", count); |
| 3335 | while (count) { |
| 3336 | ret = lttcomm_recv_unix_sock(sock, data, |
| 3337 | count > sizeof(data) ? sizeof(data) : count); |
| 3338 | if (ret < 0) { |
| 3339 | goto error; |
| 3340 | } |
| 3341 | |
| 3342 | count -= (size_t) ret; |
| 3343 | } |
| 3344 | } |
| 3345 | /* FIXME: passing packed structure to non-packed pointer */ |
| 3346 | ret = cmd_disable_event(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 3347 | cmd_ctx->lsm->u.disable.channel_name, |
| 3348 | &cmd_ctx->lsm->u.disable.event); |
| 3349 | break; |
| 3350 | } |
| 3351 | case LTTNG_ENABLE_CHANNEL: |
| 3352 | { |
| 3353 | cmd_ctx->lsm->u.channel.chan.attr.extended.ptr = |
| 3354 | (struct lttng_channel_extended *) &cmd_ctx->lsm->u.channel.extended; |
| 3355 | ret = cmd_enable_channel(cmd_ctx->session, &cmd_ctx->lsm->domain, |
| 3356 | &cmd_ctx->lsm->u.channel.chan, |
| 3357 | kernel_poll_pipe[1]); |
| 3358 | break; |
| 3359 | } |
| 3360 | case LTTNG_TRACK_PID: |
| 3361 | { |
| 3362 | ret = cmd_track_pid(cmd_ctx->session, |
| 3363 | cmd_ctx->lsm->domain.type, |
| 3364 | cmd_ctx->lsm->u.pid_tracker.pid); |
| 3365 | break; |
| 3366 | } |
| 3367 | case LTTNG_UNTRACK_PID: |
| 3368 | { |
| 3369 | ret = cmd_untrack_pid(cmd_ctx->session, |
| 3370 | cmd_ctx->lsm->domain.type, |
| 3371 | cmd_ctx->lsm->u.pid_tracker.pid); |
| 3372 | break; |
| 3373 | } |
| 3374 | case LTTNG_ENABLE_EVENT: |
| 3375 | { |
| 3376 | struct lttng_event *ev = NULL; |
| 3377 | struct lttng_event_exclusion *exclusion = NULL; |
| 3378 | struct lttng_filter_bytecode *bytecode = NULL; |
| 3379 | char *filter_expression = NULL; |
| 3380 | |
| 3381 | /* Handle exclusion events and receive it from the client. */ |
| 3382 | if (cmd_ctx->lsm->u.enable.exclusion_count > 0) { |
| 3383 | size_t count = cmd_ctx->lsm->u.enable.exclusion_count; |
| 3384 | |
| 3385 | exclusion = zmalloc(sizeof(struct lttng_event_exclusion) + |
| 3386 | (count * LTTNG_SYMBOL_NAME_LEN)); |
| 3387 | if (!exclusion) { |
| 3388 | ret = LTTNG_ERR_EXCLUSION_NOMEM; |
| 3389 | goto error; |
| 3390 | } |
| 3391 | |
| 3392 | DBG("Receiving var len exclusion event list from client ..."); |
| 3393 | exclusion->count = count; |
| 3394 | ret = lttcomm_recv_unix_sock(sock, exclusion->names, |
| 3395 | count * LTTNG_SYMBOL_NAME_LEN); |
| 3396 | if (ret <= 0) { |
| 3397 | DBG("Nothing recv() from client var len data... continuing"); |
| 3398 | *sock_error = 1; |
| 3399 | free(exclusion); |
| 3400 | ret = LTTNG_ERR_EXCLUSION_INVAL; |
| 3401 | goto error; |
| 3402 | } |
| 3403 | } |
| 3404 | |
| 3405 | /* Get filter expression from client. */ |
| 3406 | if (cmd_ctx->lsm->u.enable.expression_len > 0) { |
| 3407 | size_t expression_len = |
| 3408 | cmd_ctx->lsm->u.enable.expression_len; |
| 3409 | |
| 3410 | if (expression_len > LTTNG_FILTER_MAX_LEN) { |
| 3411 | ret = LTTNG_ERR_FILTER_INVAL; |
| 3412 | free(exclusion); |
| 3413 | goto error; |
| 3414 | } |
| 3415 | |
| 3416 | filter_expression = zmalloc(expression_len); |
| 3417 | if (!filter_expression) { |
| 3418 | free(exclusion); |
| 3419 | ret = LTTNG_ERR_FILTER_NOMEM; |
| 3420 | goto error; |
| 3421 | } |
| 3422 | |
| 3423 | /* Receive var. len. data */ |
| 3424 | DBG("Receiving var len filter's expression from client ..."); |
| 3425 | ret = lttcomm_recv_unix_sock(sock, filter_expression, |
| 3426 | expression_len); |
| 3427 | if (ret <= 0) { |
| 3428 | DBG("Nothing recv() from client var len data... continuing"); |
| 3429 | *sock_error = 1; |
| 3430 | free(filter_expression); |
| 3431 | free(exclusion); |
| 3432 | ret = LTTNG_ERR_FILTER_INVAL; |
| 3433 | goto error; |
| 3434 | } |
| 3435 | } |
| 3436 | |
| 3437 | /* Handle filter and get bytecode from client. */ |
| 3438 | if (cmd_ctx->lsm->u.enable.bytecode_len > 0) { |
| 3439 | size_t bytecode_len = cmd_ctx->lsm->u.enable.bytecode_len; |
| 3440 | |
| 3441 | if (bytecode_len > LTTNG_FILTER_MAX_LEN) { |
| 3442 | ret = LTTNG_ERR_FILTER_INVAL; |
| 3443 | free(filter_expression); |
| 3444 | free(exclusion); |
| 3445 | goto error; |
| 3446 | } |
| 3447 | |
| 3448 | bytecode = zmalloc(bytecode_len); |
| 3449 | if (!bytecode) { |
| 3450 | free(filter_expression); |
| 3451 | free(exclusion); |
| 3452 | ret = LTTNG_ERR_FILTER_NOMEM; |
| 3453 | goto error; |
| 3454 | } |
| 3455 | |
| 3456 | /* Receive var. len. data */ |
| 3457 | DBG("Receiving var len filter's bytecode from client ..."); |
| 3458 | ret = lttcomm_recv_unix_sock(sock, bytecode, bytecode_len); |
| 3459 | if (ret <= 0) { |
| 3460 | DBG("Nothing recv() from client var len data... continuing"); |
| 3461 | *sock_error = 1; |
| 3462 | free(filter_expression); |
| 3463 | free(bytecode); |
| 3464 | free(exclusion); |
| 3465 | ret = LTTNG_ERR_FILTER_INVAL; |
| 3466 | goto error; |
| 3467 | } |
| 3468 | |
| 3469 | if ((bytecode->len + sizeof(*bytecode)) != bytecode_len) { |
| 3470 | free(filter_expression); |
| 3471 | free(bytecode); |
| 3472 | free(exclusion); |
| 3473 | ret = LTTNG_ERR_FILTER_INVAL; |
| 3474 | goto error; |
| 3475 | } |
| 3476 | } |
| 3477 | |
| 3478 | ev = lttng_event_copy(&cmd_ctx->lsm->u.enable.event); |
| 3479 | if (!ev) { |
| 3480 | DBG("Failed to copy event: %s", |
| 3481 | cmd_ctx->lsm->u.enable.event.name); |
| 3482 | free(filter_expression); |
| 3483 | free(bytecode); |
| 3484 | free(exclusion); |
| 3485 | ret = LTTNG_ERR_NOMEM; |
| 3486 | goto error; |
| 3487 | } |
| 3488 | |
| 3489 | |
| 3490 | if (cmd_ctx->lsm->u.enable.userspace_probe_location_len > 0) { |
| 3491 | /* Expect a userspace probe description. */ |
| 3492 | ret = receive_userspace_probe(cmd_ctx, sock, sock_error, ev); |
| 3493 | if (ret) { |
| 3494 | free(filter_expression); |
| 3495 | free(bytecode); |
| 3496 | free(exclusion); |
| 3497 | lttng_event_destroy(ev); |
| 3498 | goto error; |
| 3499 | } |
| 3500 | } |
| 3501 | |
| 3502 | ret = cmd_enable_event(cmd_ctx->session, &cmd_ctx->lsm->domain, |
| 3503 | cmd_ctx->lsm->u.enable.channel_name, |
| 3504 | ev, |
| 3505 | filter_expression, bytecode, exclusion, |
| 3506 | kernel_poll_pipe[1]); |
| 3507 | lttng_event_destroy(ev); |
| 3508 | break; |
| 3509 | } |
| 3510 | case LTTNG_LIST_TRACEPOINTS: |
| 3511 | { |
| 3512 | struct lttng_event *events; |
| 3513 | ssize_t nb_events; |
| 3514 | |
| 3515 | session_lock_list(); |
| 3516 | nb_events = cmd_list_tracepoints(cmd_ctx->lsm->domain.type, &events); |
| 3517 | session_unlock_list(); |
| 3518 | if (nb_events < 0) { |
| 3519 | /* Return value is a negative lttng_error_code. */ |
| 3520 | ret = -nb_events; |
| 3521 | goto error; |
| 3522 | } |
| 3523 | |
| 3524 | /* |
| 3525 | * Setup lttng message with payload size set to the event list size in |
| 3526 | * bytes and then copy list into the llm payload. |
| 3527 | */ |
| 3528 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
| 3529 | sizeof(struct lttng_event) * nb_events); |
| 3530 | free(events); |
| 3531 | |
| 3532 | if (ret < 0) { |
| 3533 | goto setup_error; |
| 3534 | } |
| 3535 | |
| 3536 | ret = LTTNG_OK; |
| 3537 | break; |
| 3538 | } |
| 3539 | case LTTNG_LIST_TRACEPOINT_FIELDS: |
| 3540 | { |
| 3541 | struct lttng_event_field *fields; |
| 3542 | ssize_t nb_fields; |
| 3543 | |
| 3544 | session_lock_list(); |
| 3545 | nb_fields = cmd_list_tracepoint_fields(cmd_ctx->lsm->domain.type, |
| 3546 | &fields); |
| 3547 | session_unlock_list(); |
| 3548 | if (nb_fields < 0) { |
| 3549 | /* Return value is a negative lttng_error_code. */ |
| 3550 | ret = -nb_fields; |
| 3551 | goto error; |
| 3552 | } |
| 3553 | |
| 3554 | /* |
| 3555 | * Setup lttng message with payload size set to the event list size in |
| 3556 | * bytes and then copy list into the llm payload. |
| 3557 | */ |
| 3558 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, fields, |
| 3559 | sizeof(struct lttng_event_field) * nb_fields); |
| 3560 | free(fields); |
| 3561 | |
| 3562 | if (ret < 0) { |
| 3563 | goto setup_error; |
| 3564 | } |
| 3565 | |
| 3566 | ret = LTTNG_OK; |
| 3567 | break; |
| 3568 | } |
| 3569 | case LTTNG_LIST_SYSCALLS: |
| 3570 | { |
| 3571 | struct lttng_event *events; |
| 3572 | ssize_t nb_events; |
| 3573 | |
| 3574 | nb_events = cmd_list_syscalls(&events); |
| 3575 | if (nb_events < 0) { |
| 3576 | /* Return value is a negative lttng_error_code. */ |
| 3577 | ret = -nb_events; |
| 3578 | goto error; |
| 3579 | } |
| 3580 | |
| 3581 | /* |
| 3582 | * Setup lttng message with payload size set to the event list size in |
| 3583 | * bytes and then copy list into the llm payload. |
| 3584 | */ |
| 3585 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, events, |
| 3586 | sizeof(struct lttng_event) * nb_events); |
| 3587 | free(events); |
| 3588 | |
| 3589 | if (ret < 0) { |
| 3590 | goto setup_error; |
| 3591 | } |
| 3592 | |
| 3593 | ret = LTTNG_OK; |
| 3594 | break; |
| 3595 | } |
| 3596 | case LTTNG_LIST_TRACKER_PIDS: |
| 3597 | { |
| 3598 | int32_t *pids = NULL; |
| 3599 | ssize_t nr_pids; |
| 3600 | |
| 3601 | nr_pids = cmd_list_tracker_pids(cmd_ctx->session, |
| 3602 | cmd_ctx->lsm->domain.type, &pids); |
| 3603 | if (nr_pids < 0) { |
| 3604 | /* Return value is a negative lttng_error_code. */ |
| 3605 | ret = -nr_pids; |
| 3606 | goto error; |
| 3607 | } |
| 3608 | |
| 3609 | /* |
| 3610 | * Setup lttng message with payload size set to the event list size in |
| 3611 | * bytes and then copy list into the llm payload. |
| 3612 | */ |
| 3613 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, pids, |
| 3614 | sizeof(int32_t) * nr_pids); |
| 3615 | free(pids); |
| 3616 | |
| 3617 | if (ret < 0) { |
| 3618 | goto setup_error; |
| 3619 | } |
| 3620 | |
| 3621 | ret = LTTNG_OK; |
| 3622 | break; |
| 3623 | } |
| 3624 | case LTTNG_SET_CONSUMER_URI: |
| 3625 | { |
| 3626 | size_t nb_uri, len; |
| 3627 | struct lttng_uri *uris; |
| 3628 | |
| 3629 | nb_uri = cmd_ctx->lsm->u.uri.size; |
| 3630 | len = nb_uri * sizeof(struct lttng_uri); |
| 3631 | |
| 3632 | if (nb_uri == 0) { |
| 3633 | ret = LTTNG_ERR_INVALID; |
| 3634 | goto error; |
| 3635 | } |
| 3636 | |
| 3637 | uris = zmalloc(len); |
| 3638 | if (uris == NULL) { |
| 3639 | ret = LTTNG_ERR_FATAL; |
| 3640 | goto error; |
| 3641 | } |
| 3642 | |
| 3643 | /* Receive variable len data */ |
| 3644 | DBG("Receiving %zu URI(s) from client ...", nb_uri); |
| 3645 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
| 3646 | if (ret <= 0) { |
| 3647 | DBG("No URIs received from client... continuing"); |
| 3648 | *sock_error = 1; |
| 3649 | ret = LTTNG_ERR_SESSION_FAIL; |
| 3650 | free(uris); |
| 3651 | goto error; |
| 3652 | } |
| 3653 | |
| 3654 | ret = cmd_set_consumer_uri(cmd_ctx->session, nb_uri, uris); |
| 3655 | free(uris); |
| 3656 | if (ret != LTTNG_OK) { |
| 3657 | goto error; |
| 3658 | } |
| 3659 | |
| 3660 | |
| 3661 | break; |
| 3662 | } |
| 3663 | case LTTNG_START_TRACE: |
| 3664 | { |
| 3665 | /* |
| 3666 | * On the first start, if we have a kernel session and we have |
| 3667 | * enabled time or size-based rotations, we have to make sure |
| 3668 | * the kernel tracer supports it. |
| 3669 | */ |
| 3670 | if (!cmd_ctx->session->has_been_started && \ |
| 3671 | cmd_ctx->session->kernel_session && \ |
| 3672 | (cmd_ctx->session->rotate_timer_period || \ |
| 3673 | cmd_ctx->session->rotate_size) && \ |
| 3674 | !check_rotate_compatible()) { |
| 3675 | DBG("Kernel tracer version is not compatible with the rotation feature"); |
| 3676 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; |
| 3677 | goto error; |
| 3678 | } |
| 3679 | ret = cmd_start_trace(cmd_ctx->session); |
| 3680 | break; |
| 3681 | } |
| 3682 | case LTTNG_STOP_TRACE: |
| 3683 | { |
| 3684 | ret = cmd_stop_trace(cmd_ctx->session); |
| 3685 | break; |
| 3686 | } |
| 3687 | case LTTNG_CREATE_SESSION: |
| 3688 | { |
| 3689 | size_t nb_uri, len; |
| 3690 | struct lttng_uri *uris = NULL; |
| 3691 | |
| 3692 | nb_uri = cmd_ctx->lsm->u.uri.size; |
| 3693 | len = nb_uri * sizeof(struct lttng_uri); |
| 3694 | |
| 3695 | if (nb_uri > 0) { |
| 3696 | uris = zmalloc(len); |
| 3697 | if (uris == NULL) { |
| 3698 | ret = LTTNG_ERR_FATAL; |
| 3699 | goto error; |
| 3700 | } |
| 3701 | |
| 3702 | /* Receive variable len data */ |
| 3703 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
| 3704 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
| 3705 | if (ret <= 0) { |
| 3706 | DBG("No URIs received from client... continuing"); |
| 3707 | *sock_error = 1; |
| 3708 | ret = LTTNG_ERR_SESSION_FAIL; |
| 3709 | free(uris); |
| 3710 | goto error; |
| 3711 | } |
| 3712 | |
| 3713 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { |
| 3714 | DBG("Creating session with ONE network URI is a bad call"); |
| 3715 | ret = LTTNG_ERR_SESSION_FAIL; |
| 3716 | free(uris); |
| 3717 | goto error; |
| 3718 | } |
| 3719 | } |
| 3720 | |
| 3721 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, nb_uri, |
| 3722 | &cmd_ctx->creds, 0); |
| 3723 | |
| 3724 | free(uris); |
| 3725 | |
| 3726 | break; |
| 3727 | } |
| 3728 | case LTTNG_DESTROY_SESSION: |
| 3729 | { |
| 3730 | ret = cmd_destroy_session(cmd_ctx->session, |
| 3731 | notification_thread_handle); |
| 3732 | break; |
| 3733 | } |
| 3734 | case LTTNG_LIST_DOMAINS: |
| 3735 | { |
| 3736 | ssize_t nb_dom; |
| 3737 | struct lttng_domain *domains = NULL; |
| 3738 | |
| 3739 | nb_dom = cmd_list_domains(cmd_ctx->session, &domains); |
| 3740 | if (nb_dom < 0) { |
| 3741 | /* Return value is a negative lttng_error_code. */ |
| 3742 | ret = -nb_dom; |
| 3743 | goto error; |
| 3744 | } |
| 3745 | |
| 3746 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, domains, |
| 3747 | nb_dom * sizeof(struct lttng_domain)); |
| 3748 | free(domains); |
| 3749 | |
| 3750 | if (ret < 0) { |
| 3751 | goto setup_error; |
| 3752 | } |
| 3753 | |
| 3754 | ret = LTTNG_OK; |
| 3755 | break; |
| 3756 | } |
| 3757 | case LTTNG_LIST_CHANNELS: |
| 3758 | { |
| 3759 | ssize_t payload_size; |
| 3760 | struct lttng_channel *channels = NULL; |
| 3761 | |
| 3762 | payload_size = cmd_list_channels(cmd_ctx->lsm->domain.type, |
| 3763 | cmd_ctx->session, &channels); |
| 3764 | if (payload_size < 0) { |
| 3765 | /* Return value is a negative lttng_error_code. */ |
| 3766 | ret = -payload_size; |
| 3767 | goto error; |
| 3768 | } |
| 3769 | |
| 3770 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, channels, |
| 3771 | payload_size); |
| 3772 | free(channels); |
| 3773 | |
| 3774 | if (ret < 0) { |
| 3775 | goto setup_error; |
| 3776 | } |
| 3777 | |
| 3778 | ret = LTTNG_OK; |
| 3779 | break; |
| 3780 | } |
| 3781 | case LTTNG_LIST_EVENTS: |
| 3782 | { |
| 3783 | ssize_t nb_event; |
| 3784 | struct lttng_event *events = NULL; |
| 3785 | struct lttcomm_event_command_header cmd_header; |
| 3786 | size_t total_size; |
| 3787 | |
| 3788 | memset(&cmd_header, 0, sizeof(cmd_header)); |
| 3789 | /* Extended infos are included at the end of events */ |
| 3790 | nb_event = cmd_list_events(cmd_ctx->lsm->domain.type, |
| 3791 | cmd_ctx->session, cmd_ctx->lsm->u.list.channel_name, |
| 3792 | &events, &total_size); |
| 3793 | |
| 3794 | if (nb_event < 0) { |
| 3795 | /* Return value is a negative lttng_error_code. */ |
| 3796 | ret = -nb_event; |
| 3797 | goto error; |
| 3798 | } |
| 3799 | |
| 3800 | cmd_header.nb_events = nb_event; |
| 3801 | ret = setup_lttng_msg(cmd_ctx, events, total_size, |
| 3802 | &cmd_header, sizeof(cmd_header)); |
| 3803 | free(events); |
| 3804 | |
| 3805 | if (ret < 0) { |
| 3806 | goto setup_error; |
| 3807 | } |
| 3808 | |
| 3809 | ret = LTTNG_OK; |
| 3810 | break; |
| 3811 | } |
| 3812 | case LTTNG_LIST_SESSIONS: |
| 3813 | { |
| 3814 | unsigned int nr_sessions; |
| 3815 | void *sessions_payload; |
| 3816 | size_t payload_len; |
| 3817 | |
| 3818 | session_lock_list(); |
| 3819 | nr_sessions = lttng_sessions_count( |
| 3820 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
| 3821 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); |
| 3822 | payload_len = sizeof(struct lttng_session) * nr_sessions; |
| 3823 | sessions_payload = zmalloc(payload_len); |
| 3824 | |
| 3825 | if (!sessions_payload) { |
| 3826 | session_unlock_list(); |
| 3827 | ret = -ENOMEM; |
| 3828 | goto setup_error; |
| 3829 | } |
| 3830 | |
| 3831 | cmd_list_lttng_sessions(sessions_payload, |
| 3832 | LTTNG_SOCK_GET_UID_CRED(&cmd_ctx->creds), |
| 3833 | LTTNG_SOCK_GET_GID_CRED(&cmd_ctx->creds)); |
| 3834 | session_unlock_list(); |
| 3835 | |
| 3836 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, sessions_payload, |
| 3837 | payload_len); |
| 3838 | free(sessions_payload); |
| 3839 | |
| 3840 | if (ret < 0) { |
| 3841 | goto setup_error; |
| 3842 | } |
| 3843 | |
| 3844 | ret = LTTNG_OK; |
| 3845 | break; |
| 3846 | } |
| 3847 | case LTTNG_REGISTER_CONSUMER: |
| 3848 | { |
| 3849 | struct consumer_data *cdata; |
| 3850 | |
| 3851 | switch (cmd_ctx->lsm->domain.type) { |
| 3852 | case LTTNG_DOMAIN_KERNEL: |
| 3853 | cdata = &kconsumer_data; |
| 3854 | break; |
| 3855 | default: |
| 3856 | ret = LTTNG_ERR_UND; |
| 3857 | goto error; |
| 3858 | } |
| 3859 | |
| 3860 | ret = cmd_register_consumer(cmd_ctx->session, cmd_ctx->lsm->domain.type, |
| 3861 | cmd_ctx->lsm->u.reg.path, cdata); |
| 3862 | break; |
| 3863 | } |
| 3864 | case LTTNG_DATA_PENDING: |
| 3865 | { |
| 3866 | int pending_ret; |
| 3867 | uint8_t pending_ret_byte; |
| 3868 | |
| 3869 | pending_ret = cmd_data_pending(cmd_ctx->session); |
| 3870 | |
| 3871 | /* |
| 3872 | * FIXME |
| 3873 | * |
| 3874 | * This function may returns 0 or 1 to indicate whether or not |
| 3875 | * there is data pending. In case of error, it should return an |
| 3876 | * LTTNG_ERR code. However, some code paths may still return |
| 3877 | * a nondescript error code, which we handle by returning an |
| 3878 | * "unknown" error. |
| 3879 | */ |
| 3880 | if (pending_ret == 0 || pending_ret == 1) { |
| 3881 | /* |
| 3882 | * ret will be set to LTTNG_OK at the end of |
| 3883 | * this function. |
| 3884 | */ |
| 3885 | } else if (pending_ret < 0) { |
| 3886 | ret = LTTNG_ERR_UNK; |
| 3887 | goto setup_error; |
| 3888 | } else { |
| 3889 | ret = pending_ret; |
| 3890 | goto setup_error; |
| 3891 | } |
| 3892 | |
| 3893 | pending_ret_byte = (uint8_t) pending_ret; |
| 3894 | |
| 3895 | /* 1 byte to return whether or not data is pending */ |
| 3896 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, |
| 3897 | &pending_ret_byte, 1); |
| 3898 | |
| 3899 | if (ret < 0) { |
| 3900 | goto setup_error; |
| 3901 | } |
| 3902 | |
| 3903 | ret = LTTNG_OK; |
| 3904 | break; |
| 3905 | } |
| 3906 | case LTTNG_SNAPSHOT_ADD_OUTPUT: |
| 3907 | { |
| 3908 | struct lttcomm_lttng_output_id reply; |
| 3909 | |
| 3910 | ret = cmd_snapshot_add_output(cmd_ctx->session, |
| 3911 | &cmd_ctx->lsm->u.snapshot_output.output, &reply.id); |
| 3912 | if (ret != LTTNG_OK) { |
| 3913 | goto error; |
| 3914 | } |
| 3915 | |
| 3916 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &reply, |
| 3917 | sizeof(reply)); |
| 3918 | if (ret < 0) { |
| 3919 | goto setup_error; |
| 3920 | } |
| 3921 | |
| 3922 | /* Copy output list into message payload */ |
| 3923 | ret = LTTNG_OK; |
| 3924 | break; |
| 3925 | } |
| 3926 | case LTTNG_SNAPSHOT_DEL_OUTPUT: |
| 3927 | { |
| 3928 | ret = cmd_snapshot_del_output(cmd_ctx->session, |
| 3929 | &cmd_ctx->lsm->u.snapshot_output.output); |
| 3930 | break; |
| 3931 | } |
| 3932 | case LTTNG_SNAPSHOT_LIST_OUTPUT: |
| 3933 | { |
| 3934 | ssize_t nb_output; |
| 3935 | struct lttng_snapshot_output *outputs = NULL; |
| 3936 | |
| 3937 | nb_output = cmd_snapshot_list_outputs(cmd_ctx->session, &outputs); |
| 3938 | if (nb_output < 0) { |
| 3939 | ret = -nb_output; |
| 3940 | goto error; |
| 3941 | } |
| 3942 | |
| 3943 | assert((nb_output > 0 && outputs) || nb_output == 0); |
| 3944 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, outputs, |
| 3945 | nb_output * sizeof(struct lttng_snapshot_output)); |
| 3946 | free(outputs); |
| 3947 | |
| 3948 | if (ret < 0) { |
| 3949 | goto setup_error; |
| 3950 | } |
| 3951 | |
| 3952 | ret = LTTNG_OK; |
| 3953 | break; |
| 3954 | } |
| 3955 | case LTTNG_SNAPSHOT_RECORD: |
| 3956 | { |
| 3957 | ret = cmd_snapshot_record(cmd_ctx->session, |
| 3958 | &cmd_ctx->lsm->u.snapshot_record.output, |
| 3959 | cmd_ctx->lsm->u.snapshot_record.wait); |
| 3960 | break; |
| 3961 | } |
| 3962 | case LTTNG_CREATE_SESSION_SNAPSHOT: |
| 3963 | { |
| 3964 | size_t nb_uri, len; |
| 3965 | struct lttng_uri *uris = NULL; |
| 3966 | |
| 3967 | nb_uri = cmd_ctx->lsm->u.uri.size; |
| 3968 | len = nb_uri * sizeof(struct lttng_uri); |
| 3969 | |
| 3970 | if (nb_uri > 0) { |
| 3971 | uris = zmalloc(len); |
| 3972 | if (uris == NULL) { |
| 3973 | ret = LTTNG_ERR_FATAL; |
| 3974 | goto error; |
| 3975 | } |
| 3976 | |
| 3977 | /* Receive variable len data */ |
| 3978 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
| 3979 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
| 3980 | if (ret <= 0) { |
| 3981 | DBG("No URIs received from client... continuing"); |
| 3982 | *sock_error = 1; |
| 3983 | ret = LTTNG_ERR_SESSION_FAIL; |
| 3984 | free(uris); |
| 3985 | goto error; |
| 3986 | } |
| 3987 | |
| 3988 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { |
| 3989 | DBG("Creating session with ONE network URI is a bad call"); |
| 3990 | ret = LTTNG_ERR_SESSION_FAIL; |
| 3991 | free(uris); |
| 3992 | goto error; |
| 3993 | } |
| 3994 | } |
| 3995 | |
| 3996 | ret = cmd_create_session_snapshot(cmd_ctx->lsm->session.name, uris, |
| 3997 | nb_uri, &cmd_ctx->creds); |
| 3998 | free(uris); |
| 3999 | break; |
| 4000 | } |
| 4001 | case LTTNG_CREATE_SESSION_LIVE: |
| 4002 | { |
| 4003 | size_t nb_uri, len; |
| 4004 | struct lttng_uri *uris = NULL; |
| 4005 | |
| 4006 | nb_uri = cmd_ctx->lsm->u.uri.size; |
| 4007 | len = nb_uri * sizeof(struct lttng_uri); |
| 4008 | |
| 4009 | if (nb_uri > 0) { |
| 4010 | uris = zmalloc(len); |
| 4011 | if (uris == NULL) { |
| 4012 | ret = LTTNG_ERR_FATAL; |
| 4013 | goto error; |
| 4014 | } |
| 4015 | |
| 4016 | /* Receive variable len data */ |
| 4017 | DBG("Waiting for %zu URIs from client ...", nb_uri); |
| 4018 | ret = lttcomm_recv_unix_sock(sock, uris, len); |
| 4019 | if (ret <= 0) { |
| 4020 | DBG("No URIs received from client... continuing"); |
| 4021 | *sock_error = 1; |
| 4022 | ret = LTTNG_ERR_SESSION_FAIL; |
| 4023 | free(uris); |
| 4024 | goto error; |
| 4025 | } |
| 4026 | |
| 4027 | if (nb_uri == 1 && uris[0].dtype != LTTNG_DST_PATH) { |
| 4028 | DBG("Creating session with ONE network URI is a bad call"); |
| 4029 | ret = LTTNG_ERR_SESSION_FAIL; |
| 4030 | free(uris); |
| 4031 | goto error; |
| 4032 | } |
| 4033 | } |
| 4034 | |
| 4035 | ret = cmd_create_session_uri(cmd_ctx->lsm->session.name, uris, |
| 4036 | nb_uri, &cmd_ctx->creds, cmd_ctx->lsm->u.session_live.timer_interval); |
| 4037 | free(uris); |
| 4038 | break; |
| 4039 | } |
| 4040 | case LTTNG_SAVE_SESSION: |
| 4041 | { |
| 4042 | ret = cmd_save_sessions(&cmd_ctx->lsm->u.save_session.attr, |
| 4043 | &cmd_ctx->creds); |
| 4044 | break; |
| 4045 | } |
| 4046 | case LTTNG_SET_SESSION_SHM_PATH: |
| 4047 | { |
| 4048 | ret = cmd_set_session_shm_path(cmd_ctx->session, |
| 4049 | cmd_ctx->lsm->u.set_shm_path.shm_path); |
| 4050 | break; |
| 4051 | } |
| 4052 | case LTTNG_REGENERATE_METADATA: |
| 4053 | { |
| 4054 | ret = cmd_regenerate_metadata(cmd_ctx->session); |
| 4055 | break; |
| 4056 | } |
| 4057 | case LTTNG_REGENERATE_STATEDUMP: |
| 4058 | { |
| 4059 | ret = cmd_regenerate_statedump(cmd_ctx->session); |
| 4060 | break; |
| 4061 | } |
| 4062 | case LTTNG_REGISTER_TRIGGER: |
| 4063 | { |
| 4064 | ret = cmd_register_trigger(cmd_ctx, sock, |
| 4065 | notification_thread_handle); |
| 4066 | break; |
| 4067 | } |
| 4068 | case LTTNG_UNREGISTER_TRIGGER: |
| 4069 | { |
| 4070 | ret = cmd_unregister_trigger(cmd_ctx, sock, |
| 4071 | notification_thread_handle); |
| 4072 | break; |
| 4073 | } |
| 4074 | case LTTNG_ROTATE_SESSION: |
| 4075 | { |
| 4076 | struct lttng_rotate_session_return rotate_return; |
| 4077 | |
| 4078 | DBG("Client rotate session \"%s\"", cmd_ctx->session->name); |
| 4079 | |
| 4080 | memset(&rotate_return, 0, sizeof(rotate_return)); |
| 4081 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { |
| 4082 | DBG("Kernel tracer version is not compatible with the rotation feature"); |
| 4083 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; |
| 4084 | goto error; |
| 4085 | } |
| 4086 | |
| 4087 | ret = cmd_rotate_session(cmd_ctx->session, &rotate_return); |
| 4088 | if (ret < 0) { |
| 4089 | ret = -ret; |
| 4090 | goto error; |
| 4091 | } |
| 4092 | |
| 4093 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &rotate_return, |
| 4094 | sizeof(rotate_return)); |
| 4095 | if (ret < 0) { |
| 4096 | ret = -ret; |
| 4097 | goto error; |
| 4098 | } |
| 4099 | |
| 4100 | ret = LTTNG_OK; |
| 4101 | break; |
| 4102 | } |
| 4103 | case LTTNG_ROTATION_GET_INFO: |
| 4104 | { |
| 4105 | struct lttng_rotation_get_info_return get_info_return; |
| 4106 | |
| 4107 | memset(&get_info_return, 0, sizeof(get_info_return)); |
| 4108 | ret = cmd_rotate_get_info(cmd_ctx->session, &get_info_return, |
| 4109 | cmd_ctx->lsm->u.get_rotation_info.rotation_id); |
| 4110 | if (ret < 0) { |
| 4111 | ret = -ret; |
| 4112 | goto error; |
| 4113 | } |
| 4114 | |
| 4115 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &get_info_return, |
| 4116 | sizeof(get_info_return)); |
| 4117 | if (ret < 0) { |
| 4118 | ret = -ret; |
| 4119 | goto error; |
| 4120 | } |
| 4121 | |
| 4122 | ret = LTTNG_OK; |
| 4123 | break; |
| 4124 | } |
| 4125 | case LTTNG_ROTATION_SET_SCHEDULE: |
| 4126 | { |
| 4127 | bool set_schedule; |
| 4128 | enum lttng_rotation_schedule_type schedule_type; |
| 4129 | uint64_t value; |
| 4130 | |
| 4131 | if (cmd_ctx->session->kernel_session && !check_rotate_compatible()) { |
| 4132 | DBG("Kernel tracer version does not support session rotations"); |
| 4133 | ret = LTTNG_ERR_ROTATION_WRONG_VERSION; |
| 4134 | goto error; |
| 4135 | } |
| 4136 | |
| 4137 | set_schedule = cmd_ctx->lsm->u.rotation_set_schedule.set == 1; |
| 4138 | schedule_type = (enum lttng_rotation_schedule_type) cmd_ctx->lsm->u.rotation_set_schedule.type; |
| 4139 | value = cmd_ctx->lsm->u.rotation_set_schedule.value; |
| 4140 | |
| 4141 | ret = cmd_rotation_set_schedule(cmd_ctx->session, |
| 4142 | set_schedule, |
| 4143 | schedule_type, |
| 4144 | value, |
| 4145 | notification_thread_handle); |
| 4146 | if (ret != LTTNG_OK) { |
| 4147 | goto error; |
| 4148 | } |
| 4149 | |
| 4150 | break; |
| 4151 | } |
| 4152 | case LTTNG_SESSION_LIST_ROTATION_SCHEDULES: |
| 4153 | { |
| 4154 | struct lttng_session_list_schedules_return schedules = { |
| 4155 | .periodic.set = !!cmd_ctx->session->rotate_timer_period, |
| 4156 | .periodic.value = cmd_ctx->session->rotate_timer_period, |
| 4157 | .size.set = !!cmd_ctx->session->rotate_size, |
| 4158 | .size.value = cmd_ctx->session->rotate_size, |
| 4159 | }; |
| 4160 | |
| 4161 | ret = setup_lttng_msg_no_cmd_header(cmd_ctx, &schedules, |
| 4162 | sizeof(schedules)); |
| 4163 | if (ret < 0) { |
| 4164 | ret = -ret; |
| 4165 | goto error; |
| 4166 | } |
| 4167 | |
| 4168 | ret = LTTNG_OK; |
| 4169 | break; |
| 4170 | } |
| 4171 | default: |
| 4172 | ret = LTTNG_ERR_UND; |
| 4173 | break; |
| 4174 | } |
| 4175 | |
| 4176 | error: |
| 4177 | if (cmd_ctx->llm == NULL) { |
| 4178 | DBG("Missing llm structure. Allocating one."); |
| 4179 | if (setup_lttng_msg_no_cmd_header(cmd_ctx, NULL, 0) < 0) { |
| 4180 | goto setup_error; |
| 4181 | } |
| 4182 | } |
| 4183 | /* Set return code */ |
| 4184 | cmd_ctx->llm->ret_code = ret; |
| 4185 | setup_error: |
| 4186 | if (cmd_ctx->session) { |
| 4187 | session_unlock(cmd_ctx->session); |
| 4188 | session_put(cmd_ctx->session); |
| 4189 | } |
| 4190 | if (need_tracing_session) { |
| 4191 | session_unlock_list(); |
| 4192 | } |
| 4193 | init_setup_error: |
| 4194 | assert(!rcu_read_ongoing()); |
| 4195 | return ret; |
| 4196 | } |
| 4197 | |
| 4198 | /* |
| 4199 | * Thread managing health check socket. |
| 4200 | */ |
| 4201 | static void *thread_manage_health(void *data) |
| 4202 | { |
| 4203 | int sock = -1, new_sock = -1, ret, i, pollfd, err = -1; |
| 4204 | uint32_t revents, nb_fd; |
| 4205 | struct lttng_poll_event events; |
| 4206 | struct health_comm_msg msg; |
| 4207 | struct health_comm_reply reply; |
| 4208 | |
| 4209 | DBG("[thread] Manage health check started"); |
| 4210 | |
| 4211 | rcu_register_thread(); |
| 4212 | |
| 4213 | /* We might hit an error path before this is created. */ |
| 4214 | lttng_poll_init(&events); |
| 4215 | |
| 4216 | /* Create unix socket */ |
| 4217 | sock = lttcomm_create_unix_sock(config.health_unix_sock_path.value); |
| 4218 | if (sock < 0) { |
| 4219 | ERR("Unable to create health check Unix socket"); |
| 4220 | goto error; |
| 4221 | } |
| 4222 | |
| 4223 | if (is_root) { |
| 4224 | /* lttng health client socket path permissions */ |
| 4225 | ret = chown(config.health_unix_sock_path.value, 0, |
| 4226 | utils_get_group_id(config.tracing_group_name.value)); |
| 4227 | if (ret < 0) { |
| 4228 | ERR("Unable to set group on %s", config.health_unix_sock_path.value); |
| 4229 | PERROR("chown"); |
| 4230 | goto error; |
| 4231 | } |
| 4232 | |
| 4233 | ret = chmod(config.health_unix_sock_path.value, |
| 4234 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 4235 | if (ret < 0) { |
| 4236 | ERR("Unable to set permissions on %s", config.health_unix_sock_path.value); |
| 4237 | PERROR("chmod"); |
| 4238 | goto error; |
| 4239 | } |
| 4240 | } |
| 4241 | |
| 4242 | /* |
| 4243 | * Set the CLOEXEC flag. Return code is useless because either way, the |
| 4244 | * show must go on. |
| 4245 | */ |
| 4246 | (void) utils_set_fd_cloexec(sock); |
| 4247 | |
| 4248 | ret = lttcomm_listen_unix_sock(sock); |
| 4249 | if (ret < 0) { |
| 4250 | goto error; |
| 4251 | } |
| 4252 | |
| 4253 | /* |
| 4254 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing |
| 4255 | * more will be added to this poll set. |
| 4256 | */ |
| 4257 | ret = sessiond_set_thread_pollset(&events, 2); |
| 4258 | if (ret < 0) { |
| 4259 | goto error; |
| 4260 | } |
| 4261 | |
| 4262 | /* Add the application registration socket */ |
| 4263 | ret = lttng_poll_add(&events, sock, LPOLLIN | LPOLLPRI); |
| 4264 | if (ret < 0) { |
| 4265 | goto error; |
| 4266 | } |
| 4267 | |
| 4268 | sessiond_notify_ready(); |
| 4269 | |
| 4270 | while (1) { |
| 4271 | DBG("Health check ready"); |
| 4272 | |
| 4273 | /* Inifinite blocking call, waiting for transmission */ |
| 4274 | restart: |
| 4275 | ret = lttng_poll_wait(&events, -1); |
| 4276 | if (ret < 0) { |
| 4277 | /* |
| 4278 | * Restart interrupted system call. |
| 4279 | */ |
| 4280 | if (errno == EINTR) { |
| 4281 | goto restart; |
| 4282 | } |
| 4283 | goto error; |
| 4284 | } |
| 4285 | |
| 4286 | nb_fd = ret; |
| 4287 | |
| 4288 | for (i = 0; i < nb_fd; i++) { |
| 4289 | /* Fetch once the poll data */ |
| 4290 | revents = LTTNG_POLL_GETEV(&events, i); |
| 4291 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 4292 | |
| 4293 | if (!revents) { |
| 4294 | /* No activity for this FD (poll implementation). */ |
| 4295 | continue; |
| 4296 | } |
| 4297 | |
| 4298 | /* Thread quit pipe has been closed. Killing thread. */ |
| 4299 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
| 4300 | if (ret) { |
| 4301 | err = 0; |
| 4302 | goto exit; |
| 4303 | } |
| 4304 | |
| 4305 | /* Event on the registration socket */ |
| 4306 | if (pollfd == sock) { |
| 4307 | if (revents & LPOLLIN) { |
| 4308 | continue; |
| 4309 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 4310 | ERR("Health socket poll error"); |
| 4311 | goto error; |
| 4312 | } else { |
| 4313 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); |
| 4314 | goto error; |
| 4315 | } |
| 4316 | } |
| 4317 | } |
| 4318 | |
| 4319 | new_sock = lttcomm_accept_unix_sock(sock); |
| 4320 | if (new_sock < 0) { |
| 4321 | goto error; |
| 4322 | } |
| 4323 | |
| 4324 | /* |
| 4325 | * Set the CLOEXEC flag. Return code is useless because either way, the |
| 4326 | * show must go on. |
| 4327 | */ |
| 4328 | (void) utils_set_fd_cloexec(new_sock); |
| 4329 | |
| 4330 | DBG("Receiving data from client for health..."); |
| 4331 | ret = lttcomm_recv_unix_sock(new_sock, (void *)&msg, sizeof(msg)); |
| 4332 | if (ret <= 0) { |
| 4333 | DBG("Nothing recv() from client... continuing"); |
| 4334 | ret = close(new_sock); |
| 4335 | if (ret) { |
| 4336 | PERROR("close"); |
| 4337 | } |
| 4338 | continue; |
| 4339 | } |
| 4340 | |
| 4341 | rcu_thread_online(); |
| 4342 | |
| 4343 | memset(&reply, 0, sizeof(reply)); |
| 4344 | for (i = 0; i < NR_HEALTH_SESSIOND_TYPES; i++) { |
| 4345 | /* |
| 4346 | * health_check_state returns 0 if health is |
| 4347 | * bad. |
| 4348 | */ |
| 4349 | if (!health_check_state(health_sessiond, i)) { |
| 4350 | reply.ret_code |= 1ULL << i; |
| 4351 | } |
| 4352 | } |
| 4353 | |
| 4354 | DBG2("Health check return value %" PRIx64, reply.ret_code); |
| 4355 | |
| 4356 | ret = send_unix_sock(new_sock, (void *) &reply, sizeof(reply)); |
| 4357 | if (ret < 0) { |
| 4358 | ERR("Failed to send health data back to client"); |
| 4359 | } |
| 4360 | |
| 4361 | /* End of transmission */ |
| 4362 | ret = close(new_sock); |
| 4363 | if (ret) { |
| 4364 | PERROR("close"); |
| 4365 | } |
| 4366 | } |
| 4367 | |
| 4368 | exit: |
| 4369 | error: |
| 4370 | if (err) { |
| 4371 | ERR("Health error occurred in %s", __func__); |
| 4372 | } |
| 4373 | DBG("Health check thread dying"); |
| 4374 | unlink(config.health_unix_sock_path.value); |
| 4375 | if (sock >= 0) { |
| 4376 | ret = close(sock); |
| 4377 | if (ret) { |
| 4378 | PERROR("close"); |
| 4379 | } |
| 4380 | } |
| 4381 | |
| 4382 | lttng_poll_clean(&events); |
| 4383 | stop_threads(); |
| 4384 | rcu_unregister_thread(); |
| 4385 | return NULL; |
| 4386 | } |
| 4387 | |
| 4388 | /* |
| 4389 | * This thread manage all clients request using the unix client socket for |
| 4390 | * communication. |
| 4391 | */ |
| 4392 | static void *thread_manage_clients(void *data) |
| 4393 | { |
| 4394 | int sock = -1, ret, i, pollfd, err = -1; |
| 4395 | int sock_error; |
| 4396 | uint32_t revents, nb_fd; |
| 4397 | struct command_ctx *cmd_ctx = NULL; |
| 4398 | struct lttng_poll_event events; |
| 4399 | |
| 4400 | DBG("[thread] Manage client started"); |
| 4401 | |
| 4402 | rcu_register_thread(); |
| 4403 | |
| 4404 | health_register(health_sessiond, HEALTH_SESSIOND_TYPE_CMD); |
| 4405 | |
| 4406 | health_code_update(); |
| 4407 | |
| 4408 | ret = lttcomm_listen_unix_sock(client_sock); |
| 4409 | if (ret < 0) { |
| 4410 | goto error_listen; |
| 4411 | } |
| 4412 | |
| 4413 | /* |
| 4414 | * Pass 2 as size here for the thread quit pipe and client_sock. Nothing |
| 4415 | * more will be added to this poll set. |
| 4416 | */ |
| 4417 | ret = sessiond_set_thread_pollset(&events, 2); |
| 4418 | if (ret < 0) { |
| 4419 | goto error_create_poll; |
| 4420 | } |
| 4421 | |
| 4422 | /* Add the application registration socket */ |
| 4423 | ret = lttng_poll_add(&events, client_sock, LPOLLIN | LPOLLPRI); |
| 4424 | if (ret < 0) { |
| 4425 | goto error; |
| 4426 | } |
| 4427 | |
| 4428 | ret = sem_post(&load_info->message_thread_ready); |
| 4429 | if (ret) { |
| 4430 | PERROR("sem_post message_thread_ready"); |
| 4431 | goto error; |
| 4432 | } |
| 4433 | |
| 4434 | /* |
| 4435 | * Wait until all support threads are initialized before accepting |
| 4436 | * commands. |
| 4437 | */ |
| 4438 | while (uatomic_read(<tng_sessiond_ready) != 0) { |
| 4439 | /* |
| 4440 | * If a support thread failed to launch, it may signal that |
| 4441 | * we must exit and the sessiond would never be marked as |
| 4442 | * "ready". |
| 4443 | * |
| 4444 | * The timeout is set to 1ms, which serves as a way to |
| 4445 | * pace down this check. |
| 4446 | */ |
| 4447 | ret = sessiond_wait_for_quit_pipe(1000); |
| 4448 | if (ret > 0) { |
| 4449 | goto exit; |
| 4450 | } |
| 4451 | } |
| 4452 | /* |
| 4453 | * This barrier is paired with the one in sessiond_notify_ready() to |
| 4454 | * ensure that loads accessing data initialized by the other threads, |
| 4455 | * on which this thread was waiting, are not performed before this point. |
| 4456 | * |
| 4457 | * Note that this could be a 'read' memory barrier, but a full barrier |
| 4458 | * is used in case the code changes. The performance implications of |
| 4459 | * this choice are minimal since this is a slow path. |
| 4460 | */ |
| 4461 | cmm_smp_mb(); |
| 4462 | |
| 4463 | /* This testpoint is after we signal readiness to the parent. */ |
| 4464 | if (testpoint(sessiond_thread_manage_clients)) { |
| 4465 | goto error; |
| 4466 | } |
| 4467 | |
| 4468 | if (testpoint(sessiond_thread_manage_clients_before_loop)) { |
| 4469 | goto error; |
| 4470 | } |
| 4471 | |
| 4472 | health_code_update(); |
| 4473 | |
| 4474 | /* Set state as running. */ |
| 4475 | sessiond_set_client_thread_state(true); |
| 4476 | |
| 4477 | while (1) { |
| 4478 | const struct cmd_completion_handler *cmd_completion_handler; |
| 4479 | |
| 4480 | DBG("Accepting client command ..."); |
| 4481 | |
| 4482 | /* Inifinite blocking call, waiting for transmission */ |
| 4483 | restart: |
| 4484 | health_poll_entry(); |
| 4485 | ret = lttng_poll_wait(&events, -1); |
| 4486 | health_poll_exit(); |
| 4487 | if (ret < 0) { |
| 4488 | /* |
| 4489 | * Restart interrupted system call. |
| 4490 | */ |
| 4491 | if (errno == EINTR) { |
| 4492 | goto restart; |
| 4493 | } |
| 4494 | goto error; |
| 4495 | } |
| 4496 | |
| 4497 | nb_fd = ret; |
| 4498 | |
| 4499 | for (i = 0; i < nb_fd; i++) { |
| 4500 | /* Fetch once the poll data */ |
| 4501 | revents = LTTNG_POLL_GETEV(&events, i); |
| 4502 | pollfd = LTTNG_POLL_GETFD(&events, i); |
| 4503 | |
| 4504 | health_code_update(); |
| 4505 | |
| 4506 | if (!revents) { |
| 4507 | /* No activity for this FD (poll implementation). */ |
| 4508 | continue; |
| 4509 | } |
| 4510 | |
| 4511 | /* Thread quit pipe has been closed. Killing thread. */ |
| 4512 | ret = sessiond_check_thread_quit_pipe(pollfd, revents); |
| 4513 | if (ret) { |
| 4514 | err = 0; |
| 4515 | goto exit; |
| 4516 | } |
| 4517 | |
| 4518 | /* Event on the registration socket */ |
| 4519 | if (pollfd == client_sock) { |
| 4520 | if (revents & LPOLLIN) { |
| 4521 | continue; |
| 4522 | } else if (revents & (LPOLLERR | LPOLLHUP | LPOLLRDHUP)) { |
| 4523 | ERR("Client socket poll error"); |
| 4524 | goto error; |
| 4525 | } else { |
| 4526 | ERR("Unexpected poll events %u for sock %d", revents, pollfd); |
| 4527 | goto error; |
| 4528 | } |
| 4529 | } |
| 4530 | } |
| 4531 | |
| 4532 | DBG("Wait for client response"); |
| 4533 | |
| 4534 | health_code_update(); |
| 4535 | |
| 4536 | sock = lttcomm_accept_unix_sock(client_sock); |
| 4537 | if (sock < 0) { |
| 4538 | goto error; |
| 4539 | } |
| 4540 | |
| 4541 | /* |
| 4542 | * Set the CLOEXEC flag. Return code is useless because either way, the |
| 4543 | * show must go on. |
| 4544 | */ |
| 4545 | (void) utils_set_fd_cloexec(sock); |
| 4546 | |
| 4547 | /* Set socket option for credentials retrieval */ |
| 4548 | ret = lttcomm_setsockopt_creds_unix_sock(sock); |
| 4549 | if (ret < 0) { |
| 4550 | goto error; |
| 4551 | } |
| 4552 | |
| 4553 | /* Allocate context command to process the client request */ |
| 4554 | cmd_ctx = zmalloc(sizeof(struct command_ctx)); |
| 4555 | if (cmd_ctx == NULL) { |
| 4556 | PERROR("zmalloc cmd_ctx"); |
| 4557 | goto error; |
| 4558 | } |
| 4559 | |
| 4560 | /* Allocate data buffer for reception */ |
| 4561 | cmd_ctx->lsm = zmalloc(sizeof(struct lttcomm_session_msg)); |
| 4562 | if (cmd_ctx->lsm == NULL) { |
| 4563 | PERROR("zmalloc cmd_ctx->lsm"); |
| 4564 | goto error; |
| 4565 | } |
| 4566 | |
| 4567 | cmd_ctx->llm = NULL; |
| 4568 | cmd_ctx->session = NULL; |
| 4569 | |
| 4570 | health_code_update(); |
| 4571 | |
| 4572 | /* |
| 4573 | * Data is received from the lttng client. The struct |
| 4574 | * lttcomm_session_msg (lsm) contains the command and data request of |
| 4575 | * the client. |
| 4576 | */ |
| 4577 | DBG("Receiving data from client ..."); |
| 4578 | ret = lttcomm_recv_creds_unix_sock(sock, cmd_ctx->lsm, |
| 4579 | sizeof(struct lttcomm_session_msg), &cmd_ctx->creds); |
| 4580 | if (ret <= 0) { |
| 4581 | DBG("Nothing recv() from client... continuing"); |
| 4582 | ret = close(sock); |
| 4583 | if (ret) { |
| 4584 | PERROR("close"); |
| 4585 | } |
| 4586 | sock = -1; |
| 4587 | clean_command_ctx(&cmd_ctx); |
| 4588 | continue; |
| 4589 | } |
| 4590 | |
| 4591 | health_code_update(); |
| 4592 | |
| 4593 | // TODO: Validate cmd_ctx including sanity check for |
| 4594 | // security purpose. |
| 4595 | |
| 4596 | rcu_thread_online(); |
| 4597 | /* |
| 4598 | * This function dispatch the work to the kernel or userspace tracer |
| 4599 | * libs and fill the lttcomm_lttng_msg data structure of all the needed |
| 4600 | * informations for the client. The command context struct contains |
| 4601 | * everything this function may needs. |
| 4602 | */ |
| 4603 | ret = process_client_msg(cmd_ctx, sock, &sock_error); |
| 4604 | rcu_thread_offline(); |
| 4605 | if (ret < 0) { |
| 4606 | ret = close(sock); |
| 4607 | if (ret) { |
| 4608 | PERROR("close"); |
| 4609 | } |
| 4610 | sock = -1; |
| 4611 | /* |
| 4612 | * TODO: Inform client somehow of the fatal error. At |
| 4613 | * this point, ret < 0 means that a zmalloc failed |
| 4614 | * (ENOMEM). Error detected but still accept |
| 4615 | * command, unless a socket error has been |
| 4616 | * detected. |
| 4617 | */ |
| 4618 | clean_command_ctx(&cmd_ctx); |
| 4619 | continue; |
| 4620 | } |
| 4621 | |
| 4622 | cmd_completion_handler = cmd_pop_completion_handler(); |
| 4623 | if (cmd_completion_handler) { |
| 4624 | enum lttng_error_code completion_code; |
| 4625 | |
| 4626 | completion_code = cmd_completion_handler->run( |
| 4627 | cmd_completion_handler->data); |
| 4628 | if (completion_code != LTTNG_OK) { |
| 4629 | clean_command_ctx(&cmd_ctx); |
| 4630 | continue; |
| 4631 | } |
| 4632 | } |
| 4633 | |
| 4634 | health_code_update(); |
| 4635 | |
| 4636 | DBG("Sending response (size: %d, retcode: %s (%d))", |
| 4637 | cmd_ctx->lttng_msg_size, |
| 4638 | lttng_strerror(-cmd_ctx->llm->ret_code), |
| 4639 | cmd_ctx->llm->ret_code); |
| 4640 | ret = send_unix_sock(sock, cmd_ctx->llm, cmd_ctx->lttng_msg_size); |
| 4641 | if (ret < 0) { |
| 4642 | ERR("Failed to send data back to client"); |
| 4643 | } |
| 4644 | |
| 4645 | /* End of transmission */ |
| 4646 | ret = close(sock); |
| 4647 | if (ret) { |
| 4648 | PERROR("close"); |
| 4649 | } |
| 4650 | sock = -1; |
| 4651 | |
| 4652 | clean_command_ctx(&cmd_ctx); |
| 4653 | |
| 4654 | health_code_update(); |
| 4655 | } |
| 4656 | |
| 4657 | exit: |
| 4658 | error: |
| 4659 | if (sock >= 0) { |
| 4660 | ret = close(sock); |
| 4661 | if (ret) { |
| 4662 | PERROR("close"); |
| 4663 | } |
| 4664 | } |
| 4665 | |
| 4666 | lttng_poll_clean(&events); |
| 4667 | clean_command_ctx(&cmd_ctx); |
| 4668 | |
| 4669 | error_listen: |
| 4670 | error_create_poll: |
| 4671 | unlink(config.client_unix_sock_path.value); |
| 4672 | if (client_sock >= 0) { |
| 4673 | ret = close(client_sock); |
| 4674 | if (ret) { |
| 4675 | PERROR("close"); |
| 4676 | } |
| 4677 | } |
| 4678 | |
| 4679 | if (err) { |
| 4680 | health_error(); |
| 4681 | ERR("Health error occurred in %s", __func__); |
| 4682 | } |
| 4683 | |
| 4684 | health_unregister(health_sessiond); |
| 4685 | |
| 4686 | DBG("Client thread dying"); |
| 4687 | |
| 4688 | rcu_unregister_thread(); |
| 4689 | |
| 4690 | /* |
| 4691 | * Since we are creating the consumer threads, we own them, so we need |
| 4692 | * to join them before our thread exits. |
| 4693 | */ |
| 4694 | ret = join_consumer_thread(&kconsumer_data); |
| 4695 | if (ret) { |
| 4696 | errno = ret; |
| 4697 | PERROR("join_consumer"); |
| 4698 | } |
| 4699 | |
| 4700 | ret = join_consumer_thread(&ustconsumer32_data); |
| 4701 | if (ret) { |
| 4702 | errno = ret; |
| 4703 | PERROR("join_consumer ust32"); |
| 4704 | } |
| 4705 | |
| 4706 | ret = join_consumer_thread(&ustconsumer64_data); |
| 4707 | if (ret) { |
| 4708 | errno = ret; |
| 4709 | PERROR("join_consumer ust64"); |
| 4710 | } |
| 4711 | |
| 4712 | /* Set state as non-running. */ |
| 4713 | sessiond_set_client_thread_state(false); |
| 4714 | return NULL; |
| 4715 | } |
| 4716 | |
| 4717 | static int string_match(const char *str1, const char *str2) |
| 4718 | { |
| 4719 | return (str1 && str2) && !strcmp(str1, str2); |
| 4720 | } |
| 4721 | |
| 4722 | /* |
| 4723 | * Take an option from the getopt output and set it in the right variable to be |
| 4724 | * used later. |
| 4725 | * |
| 4726 | * Return 0 on success else a negative value. |
| 4727 | */ |
| 4728 | static int set_option(int opt, const char *arg, const char *optname) |
| 4729 | { |
| 4730 | int ret = 0; |
| 4731 | |
| 4732 | if (string_match(optname, "client-sock") || opt == 'c') { |
| 4733 | if (!arg || *arg == '\0') { |
| 4734 | ret = -EINVAL; |
| 4735 | goto end; |
| 4736 | } |
| 4737 | if (lttng_is_setuid_setgid()) { |
| 4738 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 4739 | "-c, --client-sock"); |
| 4740 | } else { |
| 4741 | config_string_set(&config.client_unix_sock_path, |
| 4742 | strdup(arg)); |
| 4743 | if (!config.client_unix_sock_path.value) { |
| 4744 | ret = -ENOMEM; |
| 4745 | PERROR("strdup"); |
| 4746 | } |
| 4747 | } |
| 4748 | } else if (string_match(optname, "apps-sock") || opt == 'a') { |
| 4749 | if (!arg || *arg == '\0') { |
| 4750 | ret = -EINVAL; |
| 4751 | goto end; |
| 4752 | } |
| 4753 | if (lttng_is_setuid_setgid()) { |
| 4754 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 4755 | "-a, --apps-sock"); |
| 4756 | } else { |
| 4757 | config_string_set(&config.apps_unix_sock_path, |
| 4758 | strdup(arg)); |
| 4759 | if (!config.apps_unix_sock_path.value) { |
| 4760 | ret = -ENOMEM; |
| 4761 | PERROR("strdup"); |
| 4762 | } |
| 4763 | } |
| 4764 | } else if (string_match(optname, "daemonize") || opt == 'd') { |
| 4765 | config.daemonize = true; |
| 4766 | } else if (string_match(optname, "background") || opt == 'b') { |
| 4767 | config.background = true; |
| 4768 | } else if (string_match(optname, "group") || opt == 'g') { |
| 4769 | if (!arg || *arg == '\0') { |
| 4770 | ret = -EINVAL; |
| 4771 | goto end; |
| 4772 | } |
| 4773 | if (lttng_is_setuid_setgid()) { |
| 4774 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 4775 | "-g, --group"); |
| 4776 | } else { |
| 4777 | config_string_set(&config.tracing_group_name, |
| 4778 | strdup(arg)); |
| 4779 | if (!config.tracing_group_name.value) { |
| 4780 | ret = -ENOMEM; |
| 4781 | PERROR("strdup"); |
| 4782 | } |
| 4783 | } |
| 4784 | } else if (string_match(optname, "help") || opt == 'h') { |
| 4785 | ret = utils_show_help(8, "lttng-sessiond", help_msg); |
| 4786 | if (ret) { |
| 4787 | ERR("Cannot show --help for `lttng-sessiond`"); |
| 4788 | perror("exec"); |
| 4789 | } |
| 4790 | exit(ret ? EXIT_FAILURE : EXIT_SUCCESS); |
| 4791 | } else if (string_match(optname, "version") || opt == 'V') { |
| 4792 | fprintf(stdout, "%s\n", VERSION); |
| 4793 | exit(EXIT_SUCCESS); |
| 4794 | } else if (string_match(optname, "sig-parent") || opt == 'S') { |
| 4795 | config.sig_parent = true; |
| 4796 | } else if (string_match(optname, "kconsumerd-err-sock")) { |
| 4797 | if (!arg || *arg == '\0') { |
| 4798 | ret = -EINVAL; |
| 4799 | goto end; |
| 4800 | } |
| 4801 | if (lttng_is_setuid_setgid()) { |
| 4802 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 4803 | "--kconsumerd-err-sock"); |
| 4804 | } else { |
| 4805 | config_string_set(&config.kconsumerd_err_unix_sock_path, |
| 4806 | strdup(arg)); |
| 4807 | if (!config.kconsumerd_err_unix_sock_path.value) { |
| 4808 | ret = -ENOMEM; |
| 4809 | PERROR("strdup"); |
| 4810 | } |
| 4811 | } |
| 4812 | } else if (string_match(optname, "kconsumerd-cmd-sock")) { |
| 4813 | if (!arg || *arg == '\0') { |
| 4814 | ret = -EINVAL; |
| 4815 | goto end; |
| 4816 | } |
| 4817 | if (lttng_is_setuid_setgid()) { |
| 4818 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 4819 | "--kconsumerd-cmd-sock"); |
| 4820 | } else { |
| 4821 | config_string_set(&config.kconsumerd_cmd_unix_sock_path, |
| 4822 | strdup(arg)); |
| 4823 | if (!config.kconsumerd_cmd_unix_sock_path.value) { |
| 4824 | ret = -ENOMEM; |
| 4825 | PERROR("strdup"); |
| 4826 | } |
| 4827 | } |
| 4828 | } else if (string_match(optname, "ustconsumerd64-err-sock")) { |
| 4829 | if (!arg || *arg == '\0') { |
| 4830 | ret = -EINVAL; |
| 4831 | goto end; |
| 4832 | } |
| 4833 | if (lttng_is_setuid_setgid()) { |
| 4834 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 4835 | "--ustconsumerd64-err-sock"); |
| 4836 | } else { |
| 4837 | config_string_set(&config.consumerd64_err_unix_sock_path, |
| 4838 | strdup(arg)); |
| 4839 | if (!config.consumerd64_err_unix_sock_path.value) { |
| 4840 | ret = -ENOMEM; |
| 4841 | PERROR("strdup"); |
| 4842 | } |
| 4843 | } |
| 4844 | } else if (string_match(optname, "ustconsumerd64-cmd-sock")) { |
| 4845 | if (!arg || *arg == '\0') { |
| 4846 | ret = -EINVAL; |
| 4847 | goto end; |
| 4848 | } |
| 4849 | if (lttng_is_setuid_setgid()) { |
| 4850 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 4851 | "--ustconsumerd64-cmd-sock"); |
| 4852 | } else { |
| 4853 | config_string_set(&config.consumerd64_cmd_unix_sock_path, |
| 4854 | strdup(arg)); |
| 4855 | if (!config.consumerd64_cmd_unix_sock_path.value) { |
| 4856 | ret = -ENOMEM; |
| 4857 | PERROR("strdup"); |
| 4858 | } |
| 4859 | } |
| 4860 | } else if (string_match(optname, "ustconsumerd32-err-sock")) { |
| 4861 | if (!arg || *arg == '\0') { |
| 4862 | ret = -EINVAL; |
| 4863 | goto end; |
| 4864 | } |
| 4865 | if (lttng_is_setuid_setgid()) { |
| 4866 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 4867 | "--ustconsumerd32-err-sock"); |
| 4868 | } else { |
| 4869 | config_string_set(&config.consumerd32_err_unix_sock_path, |
| 4870 | strdup(arg)); |
| 4871 | if (!config.consumerd32_err_unix_sock_path.value) { |
| 4872 | ret = -ENOMEM; |
| 4873 | PERROR("strdup"); |
| 4874 | } |
| 4875 | } |
| 4876 | } else if (string_match(optname, "ustconsumerd32-cmd-sock")) { |
| 4877 | if (!arg || *arg == '\0') { |
| 4878 | ret = -EINVAL; |
| 4879 | goto end; |
| 4880 | } |
| 4881 | if (lttng_is_setuid_setgid()) { |
| 4882 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 4883 | "--ustconsumerd32-cmd-sock"); |
| 4884 | } else { |
| 4885 | config_string_set(&config.consumerd32_cmd_unix_sock_path, |
| 4886 | strdup(arg)); |
| 4887 | if (!config.consumerd32_cmd_unix_sock_path.value) { |
| 4888 | ret = -ENOMEM; |
| 4889 | PERROR("strdup"); |
| 4890 | } |
| 4891 | } |
| 4892 | } else if (string_match(optname, "no-kernel")) { |
| 4893 | config.no_kernel = true; |
| 4894 | } else if (string_match(optname, "quiet") || opt == 'q') { |
| 4895 | config.quiet = true; |
| 4896 | } else if (string_match(optname, "verbose") || opt == 'v') { |
| 4897 | /* Verbose level can increase using multiple -v */ |
| 4898 | if (arg) { |
| 4899 | /* Value obtained from config file */ |
| 4900 | config.verbose = config_parse_value(arg); |
| 4901 | } else { |
| 4902 | /* -v used on command line */ |
| 4903 | config.verbose++; |
| 4904 | } |
| 4905 | /* Clamp value to [0, 3] */ |
| 4906 | config.verbose = config.verbose < 0 ? 0 : |
| 4907 | (config.verbose <= 3 ? config.verbose : 3); |
| 4908 | } else if (string_match(optname, "verbose-consumer")) { |
| 4909 | if (arg) { |
| 4910 | config.verbose_consumer = config_parse_value(arg); |
| 4911 | } else { |
| 4912 | config.verbose_consumer++; |
| 4913 | } |
| 4914 | } else if (string_match(optname, "consumerd32-path")) { |
| 4915 | if (!arg || *arg == '\0') { |
| 4916 | ret = -EINVAL; |
| 4917 | goto end; |
| 4918 | } |
| 4919 | if (lttng_is_setuid_setgid()) { |
| 4920 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 4921 | "--consumerd32-path"); |
| 4922 | } else { |
| 4923 | config_string_set(&config.consumerd32_bin_path, |
| 4924 | strdup(arg)); |
| 4925 | if (!config.consumerd32_bin_path.value) { |
| 4926 | PERROR("strdup"); |
| 4927 | ret = -ENOMEM; |
| 4928 | } |
| 4929 | } |
| 4930 | } else if (string_match(optname, "consumerd32-libdir")) { |
| 4931 | if (!arg || *arg == '\0') { |
| 4932 | ret = -EINVAL; |
| 4933 | goto end; |
| 4934 | } |
| 4935 | if (lttng_is_setuid_setgid()) { |
| 4936 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 4937 | "--consumerd32-libdir"); |
| 4938 | } else { |
| 4939 | config_string_set(&config.consumerd32_lib_dir, |
| 4940 | strdup(arg)); |
| 4941 | if (!config.consumerd32_lib_dir.value) { |
| 4942 | PERROR("strdup"); |
| 4943 | ret = -ENOMEM; |
| 4944 | } |
| 4945 | } |
| 4946 | } else if (string_match(optname, "consumerd64-path")) { |
| 4947 | if (!arg || *arg == '\0') { |
| 4948 | ret = -EINVAL; |
| 4949 | goto end; |
| 4950 | } |
| 4951 | if (lttng_is_setuid_setgid()) { |
| 4952 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 4953 | "--consumerd64-path"); |
| 4954 | } else { |
| 4955 | config_string_set(&config.consumerd64_bin_path, |
| 4956 | strdup(arg)); |
| 4957 | if (!config.consumerd64_bin_path.value) { |
| 4958 | PERROR("strdup"); |
| 4959 | ret = -ENOMEM; |
| 4960 | } |
| 4961 | } |
| 4962 | } else if (string_match(optname, "consumerd64-libdir")) { |
| 4963 | if (!arg || *arg == '\0') { |
| 4964 | ret = -EINVAL; |
| 4965 | goto end; |
| 4966 | } |
| 4967 | if (lttng_is_setuid_setgid()) { |
| 4968 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 4969 | "--consumerd64-libdir"); |
| 4970 | } else { |
| 4971 | config_string_set(&config.consumerd64_lib_dir, |
| 4972 | strdup(arg)); |
| 4973 | if (!config.consumerd64_lib_dir.value) { |
| 4974 | PERROR("strdup"); |
| 4975 | ret = -ENOMEM; |
| 4976 | } |
| 4977 | } |
| 4978 | } else if (string_match(optname, "pidfile") || opt == 'p') { |
| 4979 | if (!arg || *arg == '\0') { |
| 4980 | ret = -EINVAL; |
| 4981 | goto end; |
| 4982 | } |
| 4983 | if (lttng_is_setuid_setgid()) { |
| 4984 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 4985 | "-p, --pidfile"); |
| 4986 | } else { |
| 4987 | config_string_set(&config.pid_file_path, strdup(arg)); |
| 4988 | if (!config.pid_file_path.value) { |
| 4989 | PERROR("strdup"); |
| 4990 | ret = -ENOMEM; |
| 4991 | } |
| 4992 | } |
| 4993 | } else if (string_match(optname, "agent-tcp-port")) { |
| 4994 | if (!arg || *arg == '\0') { |
| 4995 | ret = -EINVAL; |
| 4996 | goto end; |
| 4997 | } |
| 4998 | if (lttng_is_setuid_setgid()) { |
| 4999 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 5000 | "--agent-tcp-port"); |
| 5001 | } else { |
| 5002 | unsigned long v; |
| 5003 | |
| 5004 | errno = 0; |
| 5005 | v = strtoul(arg, NULL, 0); |
| 5006 | if (errno != 0 || !isdigit(arg[0])) { |
| 5007 | ERR("Wrong value in --agent-tcp-port parameter: %s", arg); |
| 5008 | return -1; |
| 5009 | } |
| 5010 | if (v == 0 || v >= 65535) { |
| 5011 | ERR("Port overflow in --agent-tcp-port parameter: %s", arg); |
| 5012 | return -1; |
| 5013 | } |
| 5014 | config.agent_tcp_port.begin = config.agent_tcp_port.end = (int) v; |
| 5015 | DBG3("Agent TCP port set to non default: %i", (int) v); |
| 5016 | } |
| 5017 | } else if (string_match(optname, "load") || opt == 'l') { |
| 5018 | if (!arg || *arg == '\0') { |
| 5019 | ret = -EINVAL; |
| 5020 | goto end; |
| 5021 | } |
| 5022 | if (lttng_is_setuid_setgid()) { |
| 5023 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 5024 | "-l, --load"); |
| 5025 | } else { |
| 5026 | config_string_set(&config.load_session_path, strdup(arg)); |
| 5027 | if (!config.load_session_path.value) { |
| 5028 | PERROR("strdup"); |
| 5029 | ret = -ENOMEM; |
| 5030 | } |
| 5031 | } |
| 5032 | } else if (string_match(optname, "kmod-probes")) { |
| 5033 | if (!arg || *arg == '\0') { |
| 5034 | ret = -EINVAL; |
| 5035 | goto end; |
| 5036 | } |
| 5037 | if (lttng_is_setuid_setgid()) { |
| 5038 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 5039 | "--kmod-probes"); |
| 5040 | } else { |
| 5041 | config_string_set(&config.kmod_probes_list, strdup(arg)); |
| 5042 | if (!config.kmod_probes_list.value) { |
| 5043 | PERROR("strdup"); |
| 5044 | ret = -ENOMEM; |
| 5045 | } |
| 5046 | } |
| 5047 | } else if (string_match(optname, "extra-kmod-probes")) { |
| 5048 | if (!arg || *arg == '\0') { |
| 5049 | ret = -EINVAL; |
| 5050 | goto end; |
| 5051 | } |
| 5052 | if (lttng_is_setuid_setgid()) { |
| 5053 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 5054 | "--extra-kmod-probes"); |
| 5055 | } else { |
| 5056 | config_string_set(&config.kmod_extra_probes_list, |
| 5057 | strdup(arg)); |
| 5058 | if (!config.kmod_extra_probes_list.value) { |
| 5059 | PERROR("strdup"); |
| 5060 | ret = -ENOMEM; |
| 5061 | } |
| 5062 | } |
| 5063 | } else if (string_match(optname, "config") || opt == 'f') { |
| 5064 | /* This is handled in set_options() thus silent skip. */ |
| 5065 | goto end; |
| 5066 | } else { |
| 5067 | /* Unknown option or other error. |
| 5068 | * Error is printed by getopt, just return */ |
| 5069 | ret = -1; |
| 5070 | } |
| 5071 | |
| 5072 | end: |
| 5073 | if (ret == -EINVAL) { |
| 5074 | const char *opt_name = "unknown"; |
| 5075 | int i; |
| 5076 | |
| 5077 | for (i = 0; i < sizeof(long_options) / sizeof(struct option); |
| 5078 | i++) { |
| 5079 | if (opt == long_options[i].val) { |
| 5080 | opt_name = long_options[i].name; |
| 5081 | break; |
| 5082 | } |
| 5083 | } |
| 5084 | |
| 5085 | WARN("Invalid argument provided for option \"%s\", using default value.", |
| 5086 | opt_name); |
| 5087 | } |
| 5088 | |
| 5089 | return ret; |
| 5090 | } |
| 5091 | |
| 5092 | /* |
| 5093 | * config_entry_handler_cb used to handle options read from a config file. |
| 5094 | * See config_entry_handler_cb comment in common/config/session-config.h for the |
| 5095 | * return value conventions. |
| 5096 | */ |
| 5097 | static int config_entry_handler(const struct config_entry *entry, void *unused) |
| 5098 | { |
| 5099 | int ret = 0, i; |
| 5100 | |
| 5101 | if (!entry || !entry->name || !entry->value) { |
| 5102 | ret = -EINVAL; |
| 5103 | goto end; |
| 5104 | } |
| 5105 | |
| 5106 | /* Check if the option is to be ignored */ |
| 5107 | for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) { |
| 5108 | if (!strcmp(entry->name, config_ignore_options[i])) { |
| 5109 | goto end; |
| 5110 | } |
| 5111 | } |
| 5112 | |
| 5113 | for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; |
| 5114 | i++) { |
| 5115 | |
| 5116 | /* Ignore if not fully matched. */ |
| 5117 | if (strcmp(entry->name, long_options[i].name)) { |
| 5118 | continue; |
| 5119 | } |
| 5120 | |
| 5121 | /* |
| 5122 | * If the option takes no argument on the command line, we have to |
| 5123 | * check if the value is "true". We support non-zero numeric values, |
| 5124 | * true, on and yes. |
| 5125 | */ |
| 5126 | if (!long_options[i].has_arg) { |
| 5127 | ret = config_parse_value(entry->value); |
| 5128 | if (ret <= 0) { |
| 5129 | if (ret) { |
| 5130 | WARN("Invalid configuration value \"%s\" for option %s", |
| 5131 | entry->value, entry->name); |
| 5132 | } |
| 5133 | /* False, skip boolean config option. */ |
| 5134 | goto end; |
| 5135 | } |
| 5136 | } |
| 5137 | |
| 5138 | ret = set_option(long_options[i].val, entry->value, entry->name); |
| 5139 | goto end; |
| 5140 | } |
| 5141 | |
| 5142 | WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name); |
| 5143 | |
| 5144 | end: |
| 5145 | return ret; |
| 5146 | } |
| 5147 | |
| 5148 | /* |
| 5149 | * daemon configuration loading and argument parsing |
| 5150 | */ |
| 5151 | static int set_options(int argc, char **argv) |
| 5152 | { |
| 5153 | int ret = 0, c = 0, option_index = 0; |
| 5154 | int orig_optopt = optopt, orig_optind = optind; |
| 5155 | char *optstring; |
| 5156 | const char *config_path = NULL; |
| 5157 | |
| 5158 | optstring = utils_generate_optstring(long_options, |
| 5159 | sizeof(long_options) / sizeof(struct option)); |
| 5160 | if (!optstring) { |
| 5161 | ret = -ENOMEM; |
| 5162 | goto end; |
| 5163 | } |
| 5164 | |
| 5165 | /* Check for the --config option */ |
| 5166 | while ((c = getopt_long(argc, argv, optstring, long_options, |
| 5167 | &option_index)) != -1) { |
| 5168 | if (c == '?') { |
| 5169 | ret = -EINVAL; |
| 5170 | goto end; |
| 5171 | } else if (c != 'f') { |
| 5172 | /* if not equal to --config option. */ |
| 5173 | continue; |
| 5174 | } |
| 5175 | |
| 5176 | if (lttng_is_setuid_setgid()) { |
| 5177 | WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.", |
| 5178 | "-f, --config"); |
| 5179 | } else { |
| 5180 | config_path = utils_expand_path(optarg); |
| 5181 | if (!config_path) { |
| 5182 | ERR("Failed to resolve path: %s", optarg); |
| 5183 | } |
| 5184 | } |
| 5185 | } |
| 5186 | |
| 5187 | ret = config_get_section_entries(config_path, config_section_name, |
| 5188 | config_entry_handler, NULL); |
| 5189 | if (ret) { |
| 5190 | if (ret > 0) { |
| 5191 | ERR("Invalid configuration option at line %i", ret); |
| 5192 | ret = -1; |
| 5193 | } |
| 5194 | goto end; |
| 5195 | } |
| 5196 | |
| 5197 | /* Reset getopt's global state */ |
| 5198 | optopt = orig_optopt; |
| 5199 | optind = orig_optind; |
| 5200 | while (1) { |
| 5201 | option_index = -1; |
| 5202 | /* |
| 5203 | * getopt_long() will not set option_index if it encounters a |
| 5204 | * short option. |
| 5205 | */ |
| 5206 | c = getopt_long(argc, argv, optstring, long_options, |
| 5207 | &option_index); |
| 5208 | if (c == -1) { |
| 5209 | break; |
| 5210 | } |
| 5211 | |
| 5212 | /* |
| 5213 | * Pass NULL as the long option name if popt left the index |
| 5214 | * unset. |
| 5215 | */ |
| 5216 | ret = set_option(c, optarg, |
| 5217 | option_index < 0 ? NULL : |
| 5218 | long_options[option_index].name); |
| 5219 | if (ret < 0) { |
| 5220 | break; |
| 5221 | } |
| 5222 | } |
| 5223 | |
| 5224 | end: |
| 5225 | free(optstring); |
| 5226 | return ret; |
| 5227 | } |
| 5228 | |
| 5229 | /* |
| 5230 | * Creates the two needed socket by the daemon. |
| 5231 | * apps_sock - The communication socket for all UST apps. |
| 5232 | * client_sock - The communication of the cli tool (lttng). |
| 5233 | */ |
| 5234 | static int init_daemon_socket(void) |
| 5235 | { |
| 5236 | int ret = 0; |
| 5237 | mode_t old_umask; |
| 5238 | |
| 5239 | old_umask = umask(0); |
| 5240 | |
| 5241 | /* Create client tool unix socket */ |
| 5242 | client_sock = lttcomm_create_unix_sock(config.client_unix_sock_path.value); |
| 5243 | if (client_sock < 0) { |
| 5244 | ERR("Create unix sock failed: %s", config.client_unix_sock_path.value); |
| 5245 | ret = -1; |
| 5246 | goto end; |
| 5247 | } |
| 5248 | |
| 5249 | /* Set the cloexec flag */ |
| 5250 | ret = utils_set_fd_cloexec(client_sock); |
| 5251 | if (ret < 0) { |
| 5252 | ERR("Unable to set CLOEXEC flag to the client Unix socket (fd: %d). " |
| 5253 | "Continuing but note that the consumer daemon will have a " |
| 5254 | "reference to this socket on exec()", client_sock); |
| 5255 | } |
| 5256 | |
| 5257 | /* File permission MUST be 660 */ |
| 5258 | ret = chmod(config.client_unix_sock_path.value, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 5259 | if (ret < 0) { |
| 5260 | ERR("Set file permissions failed: %s", config.client_unix_sock_path.value); |
| 5261 | PERROR("chmod"); |
| 5262 | goto end; |
| 5263 | } |
| 5264 | |
| 5265 | /* Create the application unix socket */ |
| 5266 | apps_sock = lttcomm_create_unix_sock(config.apps_unix_sock_path.value); |
| 5267 | if (apps_sock < 0) { |
| 5268 | ERR("Create unix sock failed: %s", config.apps_unix_sock_path.value); |
| 5269 | ret = -1; |
| 5270 | goto end; |
| 5271 | } |
| 5272 | |
| 5273 | /* Set the cloexec flag */ |
| 5274 | ret = utils_set_fd_cloexec(apps_sock); |
| 5275 | if (ret < 0) { |
| 5276 | ERR("Unable to set CLOEXEC flag to the app Unix socket (fd: %d). " |
| 5277 | "Continuing but note that the consumer daemon will have a " |
| 5278 | "reference to this socket on exec()", apps_sock); |
| 5279 | } |
| 5280 | |
| 5281 | /* File permission MUST be 666 */ |
| 5282 | ret = chmod(config.apps_unix_sock_path.value, |
| 5283 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH); |
| 5284 | if (ret < 0) { |
| 5285 | ERR("Set file permissions failed: %s", config.apps_unix_sock_path.value); |
| 5286 | PERROR("chmod"); |
| 5287 | goto end; |
| 5288 | } |
| 5289 | |
| 5290 | DBG3("Session daemon client socket %d and application socket %d created", |
| 5291 | client_sock, apps_sock); |
| 5292 | |
| 5293 | end: |
| 5294 | umask(old_umask); |
| 5295 | return ret; |
| 5296 | } |
| 5297 | |
| 5298 | /* |
| 5299 | * Create lockfile using the rundir and return its fd. |
| 5300 | */ |
| 5301 | static int create_lockfile(void) |
| 5302 | { |
| 5303 | return utils_create_lock_file(config.lock_file_path.value); |
| 5304 | } |
| 5305 | |
| 5306 | /* |
| 5307 | * Check if the global socket is available, and if a daemon is answering at the |
| 5308 | * other side. If yes, error is returned. |
| 5309 | * |
| 5310 | * Also attempts to create and hold the lock file. |
| 5311 | */ |
| 5312 | static int check_existing_daemon(void) |
| 5313 | { |
| 5314 | int ret = 0; |
| 5315 | |
| 5316 | /* Is there anybody out there ? */ |
| 5317 | if (lttng_session_daemon_alive()) { |
| 5318 | ret = -EEXIST; |
| 5319 | goto end; |
| 5320 | } |
| 5321 | |
| 5322 | lockfile_fd = create_lockfile(); |
| 5323 | if (lockfile_fd < 0) { |
| 5324 | ret = -EEXIST; |
| 5325 | goto end; |
| 5326 | } |
| 5327 | end: |
| 5328 | return ret; |
| 5329 | } |
| 5330 | |
| 5331 | static void sessiond_cleanup_lock_file(void) |
| 5332 | { |
| 5333 | int ret; |
| 5334 | |
| 5335 | /* |
| 5336 | * Cleanup lock file by deleting it and finaly closing it which will |
| 5337 | * release the file system lock. |
| 5338 | */ |
| 5339 | if (lockfile_fd >= 0) { |
| 5340 | ret = remove(config.lock_file_path.value); |
| 5341 | if (ret < 0) { |
| 5342 | PERROR("remove lock file"); |
| 5343 | } |
| 5344 | ret = close(lockfile_fd); |
| 5345 | if (ret < 0) { |
| 5346 | PERROR("close lock file"); |
| 5347 | } |
| 5348 | } |
| 5349 | } |
| 5350 | |
| 5351 | /* |
| 5352 | * Set the tracing group gid onto the client socket. |
| 5353 | * |
| 5354 | * Race window between mkdir and chown is OK because we are going from more |
| 5355 | * permissive (root.root) to less permissive (root.tracing). |
| 5356 | */ |
| 5357 | static int set_permissions(char *rundir) |
| 5358 | { |
| 5359 | int ret; |
| 5360 | gid_t gid; |
| 5361 | |
| 5362 | gid = utils_get_group_id(config.tracing_group_name.value); |
| 5363 | |
| 5364 | /* Set lttng run dir */ |
| 5365 | ret = chown(rundir, 0, gid); |
| 5366 | if (ret < 0) { |
| 5367 | ERR("Unable to set group on %s", rundir); |
| 5368 | PERROR("chown"); |
| 5369 | } |
| 5370 | |
| 5371 | /* |
| 5372 | * Ensure all applications and tracing group can search the run |
| 5373 | * dir. Allow everyone to read the directory, since it does not |
| 5374 | * buy us anything to hide its content. |
| 5375 | */ |
| 5376 | ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH); |
| 5377 | if (ret < 0) { |
| 5378 | ERR("Unable to set permissions on %s", rundir); |
| 5379 | PERROR("chmod"); |
| 5380 | } |
| 5381 | |
| 5382 | /* lttng client socket path */ |
| 5383 | ret = chown(config.client_unix_sock_path.value, 0, gid); |
| 5384 | if (ret < 0) { |
| 5385 | ERR("Unable to set group on %s", config.client_unix_sock_path.value); |
| 5386 | PERROR("chown"); |
| 5387 | } |
| 5388 | |
| 5389 | /* kconsumer error socket path */ |
| 5390 | ret = chown(kconsumer_data.err_unix_sock_path, 0, 0); |
| 5391 | if (ret < 0) { |
| 5392 | ERR("Unable to set group on %s", kconsumer_data.err_unix_sock_path); |
| 5393 | PERROR("chown"); |
| 5394 | } |
| 5395 | |
| 5396 | /* 64-bit ustconsumer error socket path */ |
| 5397 | ret = chown(ustconsumer64_data.err_unix_sock_path, 0, 0); |
| 5398 | if (ret < 0) { |
| 5399 | ERR("Unable to set group on %s", ustconsumer64_data.err_unix_sock_path); |
| 5400 | PERROR("chown"); |
| 5401 | } |
| 5402 | |
| 5403 | /* 32-bit ustconsumer compat32 error socket path */ |
| 5404 | ret = chown(ustconsumer32_data.err_unix_sock_path, 0, 0); |
| 5405 | if (ret < 0) { |
| 5406 | ERR("Unable to set group on %s", ustconsumer32_data.err_unix_sock_path); |
| 5407 | PERROR("chown"); |
| 5408 | } |
| 5409 | |
| 5410 | DBG("All permissions are set"); |
| 5411 | |
| 5412 | return ret; |
| 5413 | } |
| 5414 | |
| 5415 | /* |
| 5416 | * Create the lttng run directory needed for all global sockets and pipe. |
| 5417 | */ |
| 5418 | static int create_lttng_rundir(void) |
| 5419 | { |
| 5420 | int ret; |
| 5421 | |
| 5422 | DBG3("Creating LTTng run directory: %s", config.rundir.value); |
| 5423 | |
| 5424 | ret = mkdir(config.rundir.value, S_IRWXU); |
| 5425 | if (ret < 0) { |
| 5426 | if (errno != EEXIST) { |
| 5427 | ERR("Unable to create %s", config.rundir.value); |
| 5428 | goto error; |
| 5429 | } else { |
| 5430 | ret = 0; |
| 5431 | } |
| 5432 | } |
| 5433 | |
| 5434 | error: |
| 5435 | return ret; |
| 5436 | } |
| 5437 | |
| 5438 | /* |
| 5439 | * Setup sockets and directory needed by the consumerds' communication with the |
| 5440 | * session daemon. |
| 5441 | */ |
| 5442 | static int set_consumer_sockets(struct consumer_data *consumer_data) |
| 5443 | { |
| 5444 | int ret; |
| 5445 | char *path = NULL; |
| 5446 | |
| 5447 | switch (consumer_data->type) { |
| 5448 | case LTTNG_CONSUMER_KERNEL: |
| 5449 | path = config.kconsumerd_path.value; |
| 5450 | break; |
| 5451 | case LTTNG_CONSUMER64_UST: |
| 5452 | path = config.consumerd64_path.value; |
| 5453 | break; |
| 5454 | case LTTNG_CONSUMER32_UST: |
| 5455 | path = config.consumerd32_path.value; |
| 5456 | break; |
| 5457 | default: |
| 5458 | ERR("Consumer type unknown"); |
| 5459 | ret = -EINVAL; |
| 5460 | goto error; |
| 5461 | } |
| 5462 | assert(path); |
| 5463 | |
| 5464 | DBG2("Creating consumer directory: %s", path); |
| 5465 | |
| 5466 | ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP); |
| 5467 | if (ret < 0 && errno != EEXIST) { |
| 5468 | PERROR("mkdir"); |
| 5469 | ERR("Failed to create %s", path); |
| 5470 | goto error; |
| 5471 | } |
| 5472 | if (is_root) { |
| 5473 | ret = chown(path, 0, utils_get_group_id(config.tracing_group_name.value)); |
| 5474 | if (ret < 0) { |
| 5475 | ERR("Unable to set group on %s", path); |
| 5476 | PERROR("chown"); |
| 5477 | goto error; |
| 5478 | } |
| 5479 | } |
| 5480 | |
| 5481 | /* Create the consumerd error unix socket */ |
| 5482 | consumer_data->err_sock = |
| 5483 | lttcomm_create_unix_sock(consumer_data->err_unix_sock_path); |
| 5484 | if (consumer_data->err_sock < 0) { |
| 5485 | ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path); |
| 5486 | ret = -1; |
| 5487 | goto error; |
| 5488 | } |
| 5489 | |
| 5490 | /* |
| 5491 | * Set the CLOEXEC flag. Return code is useless because either way, the |
| 5492 | * show must go on. |
| 5493 | */ |
| 5494 | ret = utils_set_fd_cloexec(consumer_data->err_sock); |
| 5495 | if (ret < 0) { |
| 5496 | PERROR("utils_set_fd_cloexec"); |
| 5497 | /* continue anyway */ |
| 5498 | } |
| 5499 | |
| 5500 | /* File permission MUST be 660 */ |
| 5501 | ret = chmod(consumer_data->err_unix_sock_path, |
| 5502 | S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP); |
| 5503 | if (ret < 0) { |
| 5504 | ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path); |
| 5505 | PERROR("chmod"); |
| 5506 | goto error; |
| 5507 | } |
| 5508 | |
| 5509 | error: |
| 5510 | return ret; |
| 5511 | } |
| 5512 | |
| 5513 | /* |
| 5514 | * Signal handler for the daemon |
| 5515 | * |
| 5516 | * Simply stop all worker threads, leaving main() return gracefully after |
| 5517 | * joining all threads and calling cleanup(). |
| 5518 | */ |
| 5519 | static void sighandler(int sig) |
| 5520 | { |
| 5521 | switch (sig) { |
| 5522 | case SIGINT: |
| 5523 | DBG("SIGINT caught"); |
| 5524 | stop_threads(); |
| 5525 | break; |
| 5526 | case SIGTERM: |
| 5527 | DBG("SIGTERM caught"); |
| 5528 | stop_threads(); |
| 5529 | break; |
| 5530 | case SIGUSR1: |
| 5531 | CMM_STORE_SHARED(recv_child_signal, 1); |
| 5532 | break; |
| 5533 | default: |
| 5534 | break; |
| 5535 | } |
| 5536 | } |
| 5537 | |
| 5538 | /* |
| 5539 | * Setup signal handler for : |
| 5540 | * SIGINT, SIGTERM, SIGPIPE |
| 5541 | */ |
| 5542 | static int set_signal_handler(void) |
| 5543 | { |
| 5544 | int ret = 0; |
| 5545 | struct sigaction sa; |
| 5546 | sigset_t sigset; |
| 5547 | |
| 5548 | if ((ret = sigemptyset(&sigset)) < 0) { |
| 5549 | PERROR("sigemptyset"); |
| 5550 | return ret; |
| 5551 | } |
| 5552 | |
| 5553 | sa.sa_mask = sigset; |
| 5554 | sa.sa_flags = 0; |
| 5555 | |
| 5556 | sa.sa_handler = sighandler; |
| 5557 | if ((ret = sigaction(SIGTERM, &sa, NULL)) < 0) { |
| 5558 | PERROR("sigaction"); |
| 5559 | return ret; |
| 5560 | } |
| 5561 | |
| 5562 | if ((ret = sigaction(SIGINT, &sa, NULL)) < 0) { |
| 5563 | PERROR("sigaction"); |
| 5564 | return ret; |
| 5565 | } |
| 5566 | |
| 5567 | if ((ret = sigaction(SIGUSR1, &sa, NULL)) < 0) { |
| 5568 | PERROR("sigaction"); |
| 5569 | return ret; |
| 5570 | } |
| 5571 | |
| 5572 | sa.sa_handler = SIG_IGN; |
| 5573 | if ((ret = sigaction(SIGPIPE, &sa, NULL)) < 0) { |
| 5574 | PERROR("sigaction"); |
| 5575 | return ret; |
| 5576 | } |
| 5577 | |
| 5578 | DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE and SIGINT"); |
| 5579 | |
| 5580 | return ret; |
| 5581 | } |
| 5582 | |
| 5583 | /* |
| 5584 | * Set open files limit to unlimited. This daemon can open a large number of |
| 5585 | * file descriptors in order to consume multiple kernel traces. |
| 5586 | */ |
| 5587 | static void set_ulimit(void) |
| 5588 | { |
| 5589 | int ret; |
| 5590 | struct rlimit lim; |
| 5591 | |
| 5592 | /* The kernel does not allow an infinite limit for open files */ |
| 5593 | lim.rlim_cur = 65535; |
| 5594 | lim.rlim_max = 65535; |
| 5595 | |
| 5596 | ret = setrlimit(RLIMIT_NOFILE, &lim); |
| 5597 | if (ret < 0) { |
| 5598 | PERROR("failed to set open files limit"); |
| 5599 | } |
| 5600 | } |
| 5601 | |
| 5602 | static int write_pidfile(void) |
| 5603 | { |
| 5604 | return utils_create_pid_file(getpid(), config.pid_file_path.value); |
| 5605 | } |
| 5606 | |
| 5607 | static int set_clock_plugin_env(void) |
| 5608 | { |
| 5609 | int ret = 0; |
| 5610 | char *env_value = NULL; |
| 5611 | |
| 5612 | if (!config.lttng_ust_clock_plugin.value) { |
| 5613 | goto end; |
| 5614 | } |
| 5615 | |
| 5616 | ret = asprintf(&env_value, "LTTNG_UST_CLOCK_PLUGIN=%s", |
| 5617 | config.lttng_ust_clock_plugin.value); |
| 5618 | if (ret < 0) { |
| 5619 | PERROR("asprintf"); |
| 5620 | goto end; |
| 5621 | } |
| 5622 | |
| 5623 | ret = putenv(env_value); |
| 5624 | if (ret) { |
| 5625 | free(env_value); |
| 5626 | PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN"); |
| 5627 | goto end; |
| 5628 | } |
| 5629 | |
| 5630 | DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"", |
| 5631 | config.lttng_ust_clock_plugin.value); |
| 5632 | end: |
| 5633 | return ret; |
| 5634 | } |
| 5635 | |
| 5636 | static void destroy_all_sessions_and_wait(void) |
| 5637 | { |
| 5638 | struct ltt_session *session, *tmp; |
| 5639 | struct ltt_session_list *session_list; |
| 5640 | |
| 5641 | session_list = session_get_list(); |
| 5642 | DBG("Initiating destruction of all sessions"); |
| 5643 | |
| 5644 | if (!session_list) { |
| 5645 | return; |
| 5646 | } |
| 5647 | |
| 5648 | /* |
| 5649 | * Ensure that the client thread is no longer accepting new commands, |
| 5650 | * which could cause new sessions to be created. |
| 5651 | */ |
| 5652 | sessiond_wait_client_thread_stopped(); |
| 5653 | |
| 5654 | session_lock_list(); |
| 5655 | /* Initiate the destruction of all sessions. */ |
| 5656 | cds_list_for_each_entry_safe(session, tmp, |
| 5657 | &session_list->head, list) { |
| 5658 | if (!session_get(session)) { |
| 5659 | continue; |
| 5660 | } |
| 5661 | |
| 5662 | session_lock(session); |
| 5663 | if (session->destroyed) { |
| 5664 | goto unlock_session; |
| 5665 | } |
| 5666 | (void) cmd_destroy_session(session, |
| 5667 | notification_thread_handle); |
| 5668 | unlock_session: |
| 5669 | session_unlock(session); |
| 5670 | session_put(session); |
| 5671 | } |
| 5672 | session_unlock_list(); |
| 5673 | |
| 5674 | /* Wait for the destruction of all sessions to complete. */ |
| 5675 | DBG("Waiting for the destruction of all sessions to complete"); |
| 5676 | session_list_wait_empty(); |
| 5677 | DBG("Destruction of all sessions completed"); |
| 5678 | } |
| 5679 | |
| 5680 | /* |
| 5681 | * main |
| 5682 | */ |
| 5683 | int main(int argc, char **argv) |
| 5684 | { |
| 5685 | int ret = 0, retval = 0; |
| 5686 | void *status; |
| 5687 | const char *env_app_timeout; |
| 5688 | struct lttng_pipe *ust32_channel_monitor_pipe = NULL, |
| 5689 | *ust64_channel_monitor_pipe = NULL, |
| 5690 | *kernel_channel_monitor_pipe = NULL; |
| 5691 | bool notification_thread_launched = false; |
| 5692 | bool rotation_thread_launched = false; |
| 5693 | bool timer_thread_launched = false; |
| 5694 | struct timer_thread_parameters timer_thread_ctx; |
| 5695 | /* Queue of rotation jobs populated by the sessiond-timer. */ |
| 5696 | struct rotation_thread_timer_queue *rotation_timer_queue = NULL; |
| 5697 | sem_t notification_thread_ready; |
| 5698 | |
| 5699 | init_kernel_workarounds(); |
| 5700 | |
| 5701 | rcu_register_thread(); |
| 5702 | |
| 5703 | if (set_signal_handler()) { |
| 5704 | retval = -1; |
| 5705 | goto exit_set_signal_handler; |
| 5706 | } |
| 5707 | |
| 5708 | if (timer_signal_init()) { |
| 5709 | retval = -1; |
| 5710 | goto exit_set_signal_handler; |
| 5711 | } |
| 5712 | |
| 5713 | page_size = sysconf(_SC_PAGESIZE); |
| 5714 | if (page_size < 0) { |
| 5715 | PERROR("sysconf _SC_PAGESIZE"); |
| 5716 | page_size = LONG_MAX; |
| 5717 | WARN("Fallback page size to %ld", page_size); |
| 5718 | } |
| 5719 | |
| 5720 | ret = sessiond_config_init(&config); |
| 5721 | if (ret) { |
| 5722 | retval = -1; |
| 5723 | goto exit_set_signal_handler; |
| 5724 | } |
| 5725 | |
| 5726 | /* |
| 5727 | * Init config from environment variables. |
| 5728 | * Command line option override env configuration per-doc. Do env first. |
| 5729 | */ |
| 5730 | sessiond_config_apply_env_config(&config); |
| 5731 | |
| 5732 | /* |
| 5733 | * Parse arguments and load the daemon configuration file. |
| 5734 | * |
| 5735 | * We have an exit_options exit path to free memory reserved by |
| 5736 | * set_options. This is needed because the rest of sessiond_cleanup() |
| 5737 | * depends on ht_cleanup_thread, which depends on lttng_daemonize, which |
| 5738 | * depends on set_options. |
| 5739 | */ |
| 5740 | progname = argv[0]; |
| 5741 | if (set_options(argc, argv)) { |
| 5742 | retval = -1; |
| 5743 | goto exit_options; |
| 5744 | } |
| 5745 | |
| 5746 | /* |
| 5747 | * Resolve all paths received as arguments, configuration option, or |
| 5748 | * through environment variable as absolute paths. This is necessary |
| 5749 | * since daemonizing causes the sessiond's current working directory |
| 5750 | * to '/'. |
| 5751 | */ |
| 5752 | ret = sessiond_config_resolve_paths(&config); |
| 5753 | if (ret) { |
| 5754 | goto exit_options; |
| 5755 | } |
| 5756 | |
| 5757 | /* Apply config. */ |
| 5758 | lttng_opt_verbose = config.verbose; |
| 5759 | lttng_opt_quiet = config.quiet; |
| 5760 | kconsumer_data.err_unix_sock_path = |
| 5761 | config.kconsumerd_err_unix_sock_path.value; |
| 5762 | kconsumer_data.cmd_unix_sock_path = |
| 5763 | config.kconsumerd_cmd_unix_sock_path.value; |
| 5764 | ustconsumer32_data.err_unix_sock_path = |
| 5765 | config.consumerd32_err_unix_sock_path.value; |
| 5766 | ustconsumer32_data.cmd_unix_sock_path = |
| 5767 | config.consumerd32_cmd_unix_sock_path.value; |
| 5768 | ustconsumer64_data.err_unix_sock_path = |
| 5769 | config.consumerd64_err_unix_sock_path.value; |
| 5770 | ustconsumer64_data.cmd_unix_sock_path = |
| 5771 | config.consumerd64_cmd_unix_sock_path.value; |
| 5772 | set_clock_plugin_env(); |
| 5773 | |
| 5774 | sessiond_config_log(&config); |
| 5775 | |
| 5776 | if (create_lttng_rundir()) { |
| 5777 | retval = -1; |
| 5778 | goto exit_options; |
| 5779 | } |
| 5780 | |
| 5781 | /* Abort launch if a session daemon is already running. */ |
| 5782 | if (check_existing_daemon()) { |
| 5783 | ERR("A session daemon is already running."); |
| 5784 | retval = -1; |
| 5785 | goto exit_options; |
| 5786 | } |
| 5787 | |
| 5788 | /* Daemonize */ |
| 5789 | if (config.daemonize || config.background) { |
| 5790 | int i; |
| 5791 | |
| 5792 | ret = lttng_daemonize(&child_ppid, &recv_child_signal, |
| 5793 | !config.background); |
| 5794 | if (ret < 0) { |
| 5795 | retval = -1; |
| 5796 | goto exit_options; |
| 5797 | } |
| 5798 | |
| 5799 | /* |
| 5800 | * We are in the child. Make sure all other file descriptors are |
| 5801 | * closed, in case we are called with more opened file |
| 5802 | * descriptors than the standard ones and the lock file. |
| 5803 | */ |
| 5804 | for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) { |
| 5805 | if (i == lockfile_fd) { |
| 5806 | continue; |
| 5807 | } |
| 5808 | (void) close(i); |
| 5809 | } |
| 5810 | } |
| 5811 | |
| 5812 | if (run_as_create_worker(argv[0]) < 0) { |
| 5813 | goto exit_create_run_as_worker_cleanup; |
| 5814 | } |
| 5815 | |
| 5816 | /* |
| 5817 | * Starting from here, we can create threads. This needs to be after |
| 5818 | * lttng_daemonize due to RCU. |
| 5819 | */ |
| 5820 | |
| 5821 | /* |
| 5822 | * Initialize the health check subsystem. This call should set the |
| 5823 | * appropriate time values. |
| 5824 | */ |
| 5825 | health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES); |
| 5826 | if (!health_sessiond) { |
| 5827 | PERROR("health_app_create error"); |
| 5828 | retval = -1; |
| 5829 | goto exit_health_sessiond_cleanup; |
| 5830 | } |
| 5831 | |
| 5832 | /* Create thread to clean up RCU hash tables */ |
| 5833 | if (init_ht_cleanup_thread(&ht_cleanup_thread)) { |
| 5834 | retval = -1; |
| 5835 | goto exit_ht_cleanup; |
| 5836 | } |
| 5837 | |
| 5838 | /* Create thread quit pipe */ |
| 5839 | if (sessiond_init_thread_quit_pipe()) { |
| 5840 | retval = -1; |
| 5841 | goto exit_init_data; |
| 5842 | } |
| 5843 | |
| 5844 | /* Check if daemon is UID = 0 */ |
| 5845 | is_root = !getuid(); |
| 5846 | if (is_root) { |
| 5847 | /* Create global run dir with root access */ |
| 5848 | |
| 5849 | kernel_channel_monitor_pipe = lttng_pipe_open(0); |
| 5850 | if (!kernel_channel_monitor_pipe) { |
| 5851 | ERR("Failed to create kernel consumer channel monitor pipe"); |
| 5852 | retval = -1; |
| 5853 | goto exit_init_data; |
| 5854 | } |
| 5855 | kconsumer_data.channel_monitor_pipe = |
| 5856 | lttng_pipe_release_writefd( |
| 5857 | kernel_channel_monitor_pipe); |
| 5858 | if (kconsumer_data.channel_monitor_pipe < 0) { |
| 5859 | retval = -1; |
| 5860 | goto exit_init_data; |
| 5861 | } |
| 5862 | } |
| 5863 | |
| 5864 | /* Set consumer initial state */ |
| 5865 | kernel_consumerd_state = CONSUMER_STOPPED; |
| 5866 | ust_consumerd_state = CONSUMER_STOPPED; |
| 5867 | |
| 5868 | ust32_channel_monitor_pipe = lttng_pipe_open(0); |
| 5869 | if (!ust32_channel_monitor_pipe) { |
| 5870 | ERR("Failed to create 32-bit user space consumer channel monitor pipe"); |
| 5871 | retval = -1; |
| 5872 | goto exit_init_data; |
| 5873 | } |
| 5874 | ustconsumer32_data.channel_monitor_pipe = lttng_pipe_release_writefd( |
| 5875 | ust32_channel_monitor_pipe); |
| 5876 | if (ustconsumer32_data.channel_monitor_pipe < 0) { |
| 5877 | retval = -1; |
| 5878 | goto exit_init_data; |
| 5879 | } |
| 5880 | |
| 5881 | /* |
| 5882 | * The rotation_thread_timer_queue structure is shared between the |
| 5883 | * sessiond timer thread and the rotation thread. The main thread keeps |
| 5884 | * its ownership and destroys it when both threads have been joined. |
| 5885 | */ |
| 5886 | rotation_timer_queue = rotation_thread_timer_queue_create(); |
| 5887 | if (!rotation_timer_queue) { |
| 5888 | retval = -1; |
| 5889 | goto exit_init_data; |
| 5890 | } |
| 5891 | timer_thread_ctx.rotation_thread_job_queue = rotation_timer_queue; |
| 5892 | |
| 5893 | ust64_channel_monitor_pipe = lttng_pipe_open(0); |
| 5894 | if (!ust64_channel_monitor_pipe) { |
| 5895 | ERR("Failed to create 64-bit user space consumer channel monitor pipe"); |
| 5896 | retval = -1; |
| 5897 | goto exit_init_data; |
| 5898 | } |
| 5899 | ustconsumer64_data.channel_monitor_pipe = lttng_pipe_release_writefd( |
| 5900 | ust64_channel_monitor_pipe); |
| 5901 | if (ustconsumer64_data.channel_monitor_pipe < 0) { |
| 5902 | retval = -1; |
| 5903 | goto exit_init_data; |
| 5904 | } |
| 5905 | |
| 5906 | /* |
| 5907 | * Init UST app hash table. Alloc hash table before this point since |
| 5908 | * cleanup() can get called after that point. |
| 5909 | */ |
| 5910 | if (ust_app_ht_alloc()) { |
| 5911 | ERR("Failed to allocate UST app hash table"); |
| 5912 | retval = -1; |
| 5913 | goto exit_init_data; |
| 5914 | } |
| 5915 | |
| 5916 | /* |
| 5917 | * Initialize agent app hash table. We allocate the hash table here |
| 5918 | * since cleanup() can get called after this point. |
| 5919 | */ |
| 5920 | if (agent_app_ht_alloc()) { |
| 5921 | ERR("Failed to allocate Agent app hash table"); |
| 5922 | retval = -1; |
| 5923 | goto exit_init_data; |
| 5924 | } |
| 5925 | |
| 5926 | /* |
| 5927 | * These actions must be executed as root. We do that *after* setting up |
| 5928 | * the sockets path because we MUST make the check for another daemon using |
| 5929 | * those paths *before* trying to set the kernel consumer sockets and init |
| 5930 | * kernel tracer. |
| 5931 | */ |
| 5932 | if (is_root) { |
| 5933 | if (set_consumer_sockets(&kconsumer_data)) { |
| 5934 | retval = -1; |
| 5935 | goto exit_init_data; |
| 5936 | } |
| 5937 | |
| 5938 | /* Setup kernel tracer */ |
| 5939 | if (!config.no_kernel) { |
| 5940 | init_kernel_tracer(); |
| 5941 | if (kernel_tracer_fd >= 0) { |
| 5942 | ret = syscall_init_table(); |
| 5943 | if (ret < 0) { |
| 5944 | ERR("Unable to populate syscall table. " |
| 5945 | "Syscall tracing won't work " |
| 5946 | "for this session daemon."); |
| 5947 | } |
| 5948 | } |
| 5949 | } |
| 5950 | |
| 5951 | /* Set ulimit for open files */ |
| 5952 | set_ulimit(); |
| 5953 | } |
| 5954 | /* init lttng_fd tracking must be done after set_ulimit. */ |
| 5955 | lttng_fd_init(); |
| 5956 | |
| 5957 | if (set_consumer_sockets(&ustconsumer64_data)) { |
| 5958 | retval = -1; |
| 5959 | goto exit_init_data; |
| 5960 | } |
| 5961 | |
| 5962 | if (set_consumer_sockets(&ustconsumer32_data)) { |
| 5963 | retval = -1; |
| 5964 | goto exit_init_data; |
| 5965 | } |
| 5966 | |
| 5967 | /* Setup the needed unix socket */ |
| 5968 | if (init_daemon_socket()) { |
| 5969 | retval = -1; |
| 5970 | goto exit_init_data; |
| 5971 | } |
| 5972 | |
| 5973 | /* Set credentials to socket */ |
| 5974 | if (is_root && set_permissions(config.rundir.value)) { |
| 5975 | retval = -1; |
| 5976 | goto exit_init_data; |
| 5977 | } |
| 5978 | |
| 5979 | /* Get parent pid if -S, --sig-parent is specified. */ |
| 5980 | if (config.sig_parent) { |
| 5981 | ppid = getppid(); |
| 5982 | } |
| 5983 | |
| 5984 | /* Setup the kernel pipe for waking up the kernel thread */ |
| 5985 | if (is_root && !config.no_kernel) { |
| 5986 | if (utils_create_pipe_cloexec(kernel_poll_pipe)) { |
| 5987 | retval = -1; |
| 5988 | goto exit_init_data; |
| 5989 | } |
| 5990 | } |
| 5991 | |
| 5992 | /* Setup the thread apps communication pipe. */ |
| 5993 | if (utils_create_pipe_cloexec(apps_cmd_pipe)) { |
| 5994 | retval = -1; |
| 5995 | goto exit_init_data; |
| 5996 | } |
| 5997 | |
| 5998 | /* Setup the thread apps notify communication pipe. */ |
| 5999 | if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) { |
| 6000 | retval = -1; |
| 6001 | goto exit_init_data; |
| 6002 | } |
| 6003 | |
| 6004 | /* Initialize global buffer per UID and PID registry. */ |
| 6005 | buffer_reg_init_uid_registry(); |
| 6006 | buffer_reg_init_pid_registry(); |
| 6007 | |
| 6008 | /* Init UST command queue. */ |
| 6009 | cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail); |
| 6010 | |
| 6011 | cmd_init(); |
| 6012 | |
| 6013 | /* Check for the application socket timeout env variable. */ |
| 6014 | env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV); |
| 6015 | if (env_app_timeout) { |
| 6016 | config.app_socket_timeout = atoi(env_app_timeout); |
| 6017 | } else { |
| 6018 | config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT; |
| 6019 | } |
| 6020 | |
| 6021 | ret = write_pidfile(); |
| 6022 | if (ret) { |
| 6023 | ERR("Error in write_pidfile"); |
| 6024 | retval = -1; |
| 6025 | goto exit_init_data; |
| 6026 | } |
| 6027 | |
| 6028 | /* Initialize communication library */ |
| 6029 | lttcomm_init(); |
| 6030 | /* Initialize TCP timeout values */ |
| 6031 | lttcomm_inet_init(); |
| 6032 | |
| 6033 | if (load_session_init_data(&load_info) < 0) { |
| 6034 | retval = -1; |
| 6035 | goto exit_init_data; |
| 6036 | } |
| 6037 | load_info->path = config.load_session_path.value; |
| 6038 | |
| 6039 | /* Create health-check thread. */ |
| 6040 | ret = pthread_create(&health_thread, default_pthread_attr(), |
| 6041 | thread_manage_health, (void *) NULL); |
| 6042 | if (ret) { |
| 6043 | errno = ret; |
| 6044 | PERROR("pthread_create health"); |
| 6045 | retval = -1; |
| 6046 | goto exit_health; |
| 6047 | } |
| 6048 | |
| 6049 | /* |
| 6050 | * The rotation thread needs the notification thread to be ready before |
| 6051 | * creating the rotate_notification_channel, so we use this semaphore as |
| 6052 | * a rendez-vous point. |
| 6053 | */ |
| 6054 | sem_init(¬ification_thread_ready, 0, 0); |
| 6055 | |
| 6056 | /* notification_thread_data acquires the pipes' read side. */ |
| 6057 | notification_thread_handle = notification_thread_handle_create( |
| 6058 | ust32_channel_monitor_pipe, |
| 6059 | ust64_channel_monitor_pipe, |
| 6060 | kernel_channel_monitor_pipe, |
| 6061 | ¬ification_thread_ready); |
| 6062 | if (!notification_thread_handle) { |
| 6063 | retval = -1; |
| 6064 | ERR("Failed to create notification thread shared data"); |
| 6065 | stop_threads(); |
| 6066 | goto exit_notification; |
| 6067 | } |
| 6068 | |
| 6069 | /* Create notification thread. */ |
| 6070 | ret = pthread_create(¬ification_thread, default_pthread_attr(), |
| 6071 | thread_notification, notification_thread_handle); |
| 6072 | if (ret) { |
| 6073 | errno = ret; |
| 6074 | PERROR("pthread_create notification"); |
| 6075 | retval = -1; |
| 6076 | stop_threads(); |
| 6077 | goto exit_notification; |
| 6078 | } |
| 6079 | notification_thread_launched = true; |
| 6080 | |
| 6081 | /* Create timer thread. */ |
| 6082 | ret = pthread_create(&timer_thread, default_pthread_attr(), |
| 6083 | timer_thread_func, &timer_thread_ctx); |
| 6084 | if (ret) { |
| 6085 | errno = ret; |
| 6086 | PERROR("pthread_create timer"); |
| 6087 | retval = -1; |
| 6088 | stop_threads(); |
| 6089 | goto exit_notification; |
| 6090 | } |
| 6091 | timer_thread_launched = true; |
| 6092 | |
| 6093 | /* rotation_thread_data acquires the pipes' read side. */ |
| 6094 | rotation_thread_handle = rotation_thread_handle_create( |
| 6095 | rotation_timer_queue, |
| 6096 | notification_thread_handle, |
| 6097 | ¬ification_thread_ready); |
| 6098 | if (!rotation_thread_handle) { |
| 6099 | retval = -1; |
| 6100 | ERR("Failed to create rotation thread shared data"); |
| 6101 | stop_threads(); |
| 6102 | goto exit_rotation; |
| 6103 | } |
| 6104 | |
| 6105 | /* Create rotation thread. */ |
| 6106 | ret = pthread_create(&rotation_thread, default_pthread_attr(), |
| 6107 | thread_rotation, rotation_thread_handle); |
| 6108 | if (ret) { |
| 6109 | errno = ret; |
| 6110 | PERROR("pthread_create rotation"); |
| 6111 | retval = -1; |
| 6112 | stop_threads(); |
| 6113 | goto exit_rotation; |
| 6114 | } |
| 6115 | rotation_thread_launched = true; |
| 6116 | |
| 6117 | /* Create thread to manage the client socket */ |
| 6118 | ret = pthread_create(&client_thread, default_pthread_attr(), |
| 6119 | thread_manage_clients, (void *) NULL); |
| 6120 | if (ret) { |
| 6121 | errno = ret; |
| 6122 | PERROR("pthread_create clients"); |
| 6123 | retval = -1; |
| 6124 | stop_threads(); |
| 6125 | goto exit_client; |
| 6126 | } |
| 6127 | |
| 6128 | /* Create thread to dispatch registration */ |
| 6129 | ret = pthread_create(&dispatch_thread, default_pthread_attr(), |
| 6130 | thread_dispatch_ust_registration, (void *) NULL); |
| 6131 | if (ret) { |
| 6132 | errno = ret; |
| 6133 | PERROR("pthread_create dispatch"); |
| 6134 | retval = -1; |
| 6135 | stop_threads(); |
| 6136 | goto exit_dispatch; |
| 6137 | } |
| 6138 | |
| 6139 | /* Create thread to manage application registration. */ |
| 6140 | ret = pthread_create(®_apps_thread, default_pthread_attr(), |
| 6141 | thread_registration_apps, (void *) NULL); |
| 6142 | if (ret) { |
| 6143 | errno = ret; |
| 6144 | PERROR("pthread_create registration"); |
| 6145 | retval = -1; |
| 6146 | stop_threads(); |
| 6147 | goto exit_reg_apps; |
| 6148 | } |
| 6149 | |
| 6150 | /* Create thread to manage application socket */ |
| 6151 | ret = pthread_create(&apps_thread, default_pthread_attr(), |
| 6152 | thread_manage_apps, (void *) NULL); |
| 6153 | if (ret) { |
| 6154 | errno = ret; |
| 6155 | PERROR("pthread_create apps"); |
| 6156 | retval = -1; |
| 6157 | stop_threads(); |
| 6158 | goto exit_apps; |
| 6159 | } |
| 6160 | |
| 6161 | /* Create thread to manage application notify socket */ |
| 6162 | ret = pthread_create(&apps_notify_thread, default_pthread_attr(), |
| 6163 | ust_thread_manage_notify, (void *) NULL); |
| 6164 | if (ret) { |
| 6165 | errno = ret; |
| 6166 | PERROR("pthread_create notify"); |
| 6167 | retval = -1; |
| 6168 | stop_threads(); |
| 6169 | goto exit_apps_notify; |
| 6170 | } |
| 6171 | |
| 6172 | /* Create agent registration thread. */ |
| 6173 | ret = pthread_create(&agent_reg_thread, default_pthread_attr(), |
| 6174 | agent_thread_manage_registration, (void *) NULL); |
| 6175 | if (ret) { |
| 6176 | errno = ret; |
| 6177 | PERROR("pthread_create agent"); |
| 6178 | retval = -1; |
| 6179 | stop_threads(); |
| 6180 | goto exit_agent_reg; |
| 6181 | } |
| 6182 | |
| 6183 | /* Don't start this thread if kernel tracing is not requested nor root */ |
| 6184 | if (is_root && !config.no_kernel) { |
| 6185 | /* Create kernel thread to manage kernel event */ |
| 6186 | ret = pthread_create(&kernel_thread, default_pthread_attr(), |
| 6187 | thread_manage_kernel, (void *) NULL); |
| 6188 | if (ret) { |
| 6189 | errno = ret; |
| 6190 | PERROR("pthread_create kernel"); |
| 6191 | retval = -1; |
| 6192 | stop_threads(); |
| 6193 | goto exit_kernel; |
| 6194 | } |
| 6195 | } |
| 6196 | |
| 6197 | /* Create session loading thread. */ |
| 6198 | ret = pthread_create(&load_session_thread, default_pthread_attr(), |
| 6199 | thread_load_session, load_info); |
| 6200 | if (ret) { |
| 6201 | errno = ret; |
| 6202 | PERROR("pthread_create load_session_thread"); |
| 6203 | retval = -1; |
| 6204 | stop_threads(); |
| 6205 | goto exit_load_session; |
| 6206 | } |
| 6207 | |
| 6208 | /* |
| 6209 | * This is where we start awaiting program completion (e.g. through |
| 6210 | * signal that asks threads to teardown). |
| 6211 | */ |
| 6212 | |
| 6213 | ret = pthread_join(load_session_thread, &status); |
| 6214 | if (ret) { |
| 6215 | errno = ret; |
| 6216 | PERROR("pthread_join load_session_thread"); |
| 6217 | retval = -1; |
| 6218 | } |
| 6219 | |
| 6220 | /* Initiate teardown once activity occurs on the quit pipe. */ |
| 6221 | sessiond_wait_for_quit_pipe(-1U); |
| 6222 | destroy_all_sessions_and_wait(); |
| 6223 | exit_load_session: |
| 6224 | |
| 6225 | if (is_root && !config.no_kernel) { |
| 6226 | ret = pthread_join(kernel_thread, &status); |
| 6227 | if (ret) { |
| 6228 | errno = ret; |
| 6229 | PERROR("pthread_join"); |
| 6230 | retval = -1; |
| 6231 | } |
| 6232 | } |
| 6233 | exit_kernel: |
| 6234 | |
| 6235 | ret = pthread_join(agent_reg_thread, &status); |
| 6236 | if (ret) { |
| 6237 | errno = ret; |
| 6238 | PERROR("pthread_join agent"); |
| 6239 | retval = -1; |
| 6240 | } |
| 6241 | exit_agent_reg: |
| 6242 | |
| 6243 | ret = pthread_join(apps_notify_thread, &status); |
| 6244 | if (ret) { |
| 6245 | errno = ret; |
| 6246 | PERROR("pthread_join apps notify"); |
| 6247 | retval = -1; |
| 6248 | } |
| 6249 | exit_apps_notify: |
| 6250 | |
| 6251 | ret = pthread_join(apps_thread, &status); |
| 6252 | if (ret) { |
| 6253 | errno = ret; |
| 6254 | PERROR("pthread_join apps"); |
| 6255 | retval = -1; |
| 6256 | } |
| 6257 | exit_apps: |
| 6258 | |
| 6259 | ret = pthread_join(reg_apps_thread, &status); |
| 6260 | if (ret) { |
| 6261 | errno = ret; |
| 6262 | PERROR("pthread_join"); |
| 6263 | retval = -1; |
| 6264 | } |
| 6265 | exit_reg_apps: |
| 6266 | |
| 6267 | /* |
| 6268 | * Join dispatch thread after joining reg_apps_thread to ensure |
| 6269 | * we don't leak applications in the queue. |
| 6270 | */ |
| 6271 | ret = pthread_join(dispatch_thread, &status); |
| 6272 | if (ret) { |
| 6273 | errno = ret; |
| 6274 | PERROR("pthread_join"); |
| 6275 | retval = -1; |
| 6276 | } |
| 6277 | exit_dispatch: |
| 6278 | |
| 6279 | ret = pthread_join(client_thread, &status); |
| 6280 | if (ret) { |
| 6281 | errno = ret; |
| 6282 | PERROR("pthread_join"); |
| 6283 | retval = -1; |
| 6284 | } |
| 6285 | |
| 6286 | exit_client: |
| 6287 | exit_rotation: |
| 6288 | exit_notification: |
| 6289 | sem_destroy(¬ification_thread_ready); |
| 6290 | ret = pthread_join(health_thread, &status); |
| 6291 | if (ret) { |
| 6292 | errno = ret; |
| 6293 | PERROR("pthread_join health thread"); |
| 6294 | retval = -1; |
| 6295 | } |
| 6296 | |
| 6297 | exit_health: |
| 6298 | exit_init_data: |
| 6299 | /* |
| 6300 | * Wait for all pending call_rcu work to complete before tearing |
| 6301 | * down data structures. call_rcu worker may be trying to |
| 6302 | * perform lookups in those structures. |
| 6303 | */ |
| 6304 | rcu_barrier(); |
| 6305 | /* |
| 6306 | * sessiond_cleanup() is called when no other thread is running, except |
| 6307 | * the ht_cleanup thread, which is needed to destroy the hash tables. |
| 6308 | */ |
| 6309 | rcu_thread_online(); |
| 6310 | sessiond_cleanup(); |
| 6311 | |
| 6312 | /* |
| 6313 | * Ensure all prior call_rcu are done. call_rcu callbacks may push |
| 6314 | * hash tables to the ht_cleanup thread. Therefore, we ensure that |
| 6315 | * the queue is empty before shutting down the clean-up thread. |
| 6316 | */ |
| 6317 | rcu_barrier(); |
| 6318 | |
| 6319 | /* |
| 6320 | * The teardown of the notification system is performed after the |
| 6321 | * session daemon's teardown in order to allow it to be notified |
| 6322 | * of the active session and channels at the moment of the teardown. |
| 6323 | */ |
| 6324 | if (notification_thread_handle) { |
| 6325 | if (notification_thread_launched) { |
| 6326 | notification_thread_command_quit( |
| 6327 | notification_thread_handle); |
| 6328 | ret = pthread_join(notification_thread, &status); |
| 6329 | if (ret) { |
| 6330 | errno = ret; |
| 6331 | PERROR("pthread_join notification thread"); |
| 6332 | retval = -1; |
| 6333 | } |
| 6334 | } |
| 6335 | notification_thread_handle_destroy(notification_thread_handle); |
| 6336 | } |
| 6337 | |
| 6338 | if (rotation_thread_handle) { |
| 6339 | if (rotation_thread_launched) { |
| 6340 | ret = pthread_join(rotation_thread, &status); |
| 6341 | if (ret) { |
| 6342 | errno = ret; |
| 6343 | PERROR("pthread_join rotation thread"); |
| 6344 | retval = -1; |
| 6345 | } |
| 6346 | } |
| 6347 | rotation_thread_handle_destroy(rotation_thread_handle); |
| 6348 | } |
| 6349 | |
| 6350 | if (timer_thread_launched) { |
| 6351 | timer_exit(); |
| 6352 | ret = pthread_join(timer_thread, &status); |
| 6353 | if (ret) { |
| 6354 | errno = ret; |
| 6355 | PERROR("pthread_join timer thread"); |
| 6356 | retval = -1; |
| 6357 | } |
| 6358 | } |
| 6359 | |
| 6360 | /* |
| 6361 | * After the rotation and timer thread have quit, we can safely destroy |
| 6362 | * the rotation_timer_queue. |
| 6363 | */ |
| 6364 | rotation_thread_timer_queue_destroy(rotation_timer_queue); |
| 6365 | |
| 6366 | rcu_thread_offline(); |
| 6367 | rcu_unregister_thread(); |
| 6368 | |
| 6369 | ret = fini_ht_cleanup_thread(&ht_cleanup_thread); |
| 6370 | if (ret) { |
| 6371 | retval = -1; |
| 6372 | } |
| 6373 | lttng_pipe_destroy(ust32_channel_monitor_pipe); |
| 6374 | lttng_pipe_destroy(ust64_channel_monitor_pipe); |
| 6375 | lttng_pipe_destroy(kernel_channel_monitor_pipe); |
| 6376 | exit_ht_cleanup: |
| 6377 | |
| 6378 | health_app_destroy(health_sessiond); |
| 6379 | exit_health_sessiond_cleanup: |
| 6380 | exit_create_run_as_worker_cleanup: |
| 6381 | |
| 6382 | exit_options: |
| 6383 | sessiond_cleanup_lock_file(); |
| 6384 | sessiond_cleanup_options(); |
| 6385 | |
| 6386 | exit_set_signal_handler: |
| 6387 | if (!retval) { |
| 6388 | exit(EXIT_SUCCESS); |
| 6389 | } else { |
| 6390 | exit(EXIT_FAILURE); |
| 6391 | } |
| 6392 | } |