src/bin/lttng-sessiond/main.cpp

   1 /*
   2  * Copyright (C) 2011 EfficiOS Inc.
   3  * Copyright (C) 2011 Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
   4  * Copyright (C) 2013 Jérémie Galarneau <jeremie.galarneau@efficios.com>
   5  *
   6  * SPDX-License-Identifier: GPL-2.0-only
   7  *
   8  */
   9
  10 #define _LGPL_SOURCE
  11 #include "agent-thread.hpp"
  12 #include "agent.hpp"
  13 #include "buffer-registry.hpp"
  14 #include "channel.hpp"
  15 #include "client.hpp"
  16 #include "cmd.hpp"
  17 #include "consumer.hpp"
  18 #include "context.hpp"
  19 #include "dispatch.hpp"
  20 #include "event-notifier-error-accounting.hpp"
  21 #include "event.hpp"
  22 #include "fd-limit.hpp"
  23 #include "health-sessiond.hpp"
  24 #include "kernel-consumer.hpp"
  25 #include "kernel.hpp"
  26 #include "lttng-sessiond.hpp"
  27 #include "lttng-ust-ctl.hpp"
  28 #include "manage-apps.hpp"
  29 #include "manage-kernel.hpp"
  30 #include "modprobe.hpp"
  31 #include "notification-thread-commands.hpp"
  32 #include "notification-thread.hpp"
  33 #include "notify-apps.hpp"
  34 #include "register.hpp"
  35 #include "rotation-thread.hpp"
  36 #include "save.hpp"
  37 #include "sessiond-config.hpp"
  38 #include "testpoint.hpp"
  39 #include "thread.hpp"
  40 #include "timer.hpp"
  41 #include "ust-consumer.hpp"
  42 #include "ust-sigbus.hpp"
  43 #include "utils.hpp"
  44
  45 #include <common/common.hpp>
  46 #include <common/compat/getenv.hpp>
  47 #include <common/compat/socket.hpp>
  48 #include <common/config/session-config.hpp>
  49 #include <common/daemonize.hpp>
  50 #include <common/defaults.hpp>
  51 #include <common/dynamic-buffer.hpp>
  52 #include <common/futex.hpp>
  53 #include <common/ini-config/ini-config.hpp>
  54 #include <common/kernel-consumer/kernel-consumer.hpp>
  55 #include <common/logging-utils.hpp>
  56 #include <common/path.hpp>
  57 #include <common/relayd/relayd.hpp>
  58 #include <common/utils.hpp>
  59
  60 #include <lttng/event-internal.hpp>
  61
  62 #include <ctype.h>
  63 #include <getopt.h>
  64 #include <grp.h>
  65 #include <inttypes.h>
  66 #include <limits.h>
  67 #include <paths.h>
  68 #include <pthread.h>
  69 #include <signal.h>
  70 #include <stdio.h>
  71 #include <stdlib.h>
  72 #include <string.h>
  73 #include <sys/mman.h>
  74 #include <sys/mount.h>
  75 #include <sys/resource.h>
  76 #include <sys/socket.h>
  77 #include <sys/stat.h>
  78 #include <sys/types.h>
  79 #include <sys/wait.h>
  80 #include <unistd.h>
  81 #include <urcu/uatomic.h>
  82
  83 static const char *help_msg =
  84 #ifdef LTTNG_EMBED_HELP
  85 #include <lttng-sessiond.8.h>
  86 #else
  87         nullptr
  88 #endif
  89         ;
  90
  91 #define EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX 65535
  92 #define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR  "event-notifier-error-buffer-size"
  93 #define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR \
  94         EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR "-kernel"
  95 #define EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR \
  96         EVENT_NOTIFIER_ERROR_BUFFER_SIZE_BASE_OPTION_STR "-userspace"
  97
  98 const char *progname;
  99 static int lockfile_fd = -1;
 100 static int opt_print_version;
 101
 102 /* Set to 1 when a SIGUSR1 signal is received. */
 103 static int recv_child_signal;
 104
 105 /* Command line options */
 106 static const struct option long_options[] = {
 107         { "client-sock", required_argument, nullptr, 'c' },
 108         { "apps-sock", required_argument, nullptr, 'a' },
 109         { "kconsumerd-cmd-sock", required_argument, nullptr, '\0' },
 110         { "kconsumerd-err-sock", required_argument, nullptr, '\0' },
 111         { "ustconsumerd32-cmd-sock", required_argument, nullptr, '\0' },
 112         { "ustconsumerd32-err-sock", required_argument, nullptr, '\0' },
 113         { "ustconsumerd64-cmd-sock", required_argument, nullptr, '\0' },
 114         { "ustconsumerd64-err-sock", required_argument, nullptr, '\0' },
 115         { "consumerd32-path", required_argument, nullptr, '\0' },
 116         { "consumerd32-libdir", required_argument, nullptr, '\0' },
 117         { "consumerd64-path", required_argument, nullptr, '\0' },
 118         { "consumerd64-libdir", required_argument, nullptr, '\0' },
 119         { "daemonize", no_argument, nullptr, 'd' },
 120         { "background", no_argument, nullptr, 'b' },
 121         { "sig-parent", no_argument, nullptr, 'S' },
 122         { "help", no_argument, nullptr, 'h' },
 123         { "group", required_argument, nullptr, 'g' },
 124         { "version", no_argument, nullptr, 'V' },
 125         { "quiet", no_argument, nullptr, 'q' },
 126         { "verbose", no_argument, nullptr, 'v' },
 127         { "verbose-consumer", no_argument, nullptr, '\0' },
 128         { "no-kernel", no_argument, nullptr, '\0' },
 129         { "pidfile", required_argument, nullptr, 'p' },
 130         { "agent-tcp-port", required_argument, nullptr, '\0' },
 131         { "config", required_argument, nullptr, 'f' },
 132         { "load", required_argument, nullptr, 'l' },
 133         { "kmod-probes", required_argument, nullptr, '\0' },
 134         { "extra-kmod-probes", required_argument, nullptr, '\0' },
 135         { EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR, required_argument, nullptr, '\0' },
 136         { EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR, required_argument, nullptr, '\0' },
 137         { nullptr, 0, nullptr, 0 }
 138 };
 139
 140 /* Command line options to ignore from configuration file */
 141 static const char *config_ignore_options[] = { "help", "version", "config" };
 142
 143 /*
 144  * This pipe is used to inform the thread managing application communication
 145  * that a command is queued and ready to be processed.
 146  */
 147 static int apps_cmd_pipe[2] = { -1, -1 };
 148 static int apps_cmd_notify_pipe[2] = { -1, -1 };
 149
 150 /*
 151  * UST registration command queue. This queue is tied with a futex and uses a N
 152  * wakers / 1 waiter implemented and detailed in futex.c/.h
 153  *
 154  * The thread_registration_apps and thread_dispatch_ust_registration uses this
 155  * queue along with the wait/wake scheme. The thread_manage_apps receives down
 156  * the line new application socket and monitors it for any I/O error or clean
 157  * close that triggers an unregistration of the application.
 158  */
 159 static struct ust_cmd_queue ust_cmd_queue;
 160
 161 /*
 162  * Section name to look for in the daemon configuration file.
 163  */
 164 static const char *const config_section_name = "sessiond";
 165
 166 /* Am I root or not. Set to 1 if the daemon is running as root */
 167 static int is_root;
 168
 169 /*
 170  * Notify the main thread to initiate the teardown of the worker threads by
 171  * writing to the main quit pipe.
 172  */
 173 static void notify_main_quit_pipe()
 174 {
 175         int ret;
 176
 177         /* Stopping all threads */
 178         DBG("Notify the main thread to terminate all worker threads");
 179         ret = sessiond_notify_main_quit_pipe();
 180         if (ret < 0) {
 181                 ERR("write error on main quit pipe");
 182         }
 183 }
 184
 185 /*
 186  * Close every consumer sockets.
 187  */
 188 static void close_consumer_sockets()
 189 {
 190         int ret;
 191
 192         if (the_kconsumer_data.err_sock >= 0) {
 193                 ret = close(the_kconsumer_data.err_sock);
 194                 if (ret < 0) {
 195                         PERROR("kernel consumer err_sock close");
 196                 }
 197         }
 198         if (the_ustconsumer32_data.err_sock >= 0) {
 199                 ret = close(the_ustconsumer32_data.err_sock);
 200                 if (ret < 0) {
 201                         PERROR("UST consumerd32 err_sock close");
 202                 }
 203         }
 204         if (the_ustconsumer64_data.err_sock >= 0) {
 205                 ret = close(the_ustconsumer64_data.err_sock);
 206                 if (ret < 0) {
 207                         PERROR("UST consumerd64 err_sock close");
 208                 }
 209         }
 210         if (the_kconsumer_data.cmd_sock >= 0) {
 211                 ret = close(the_kconsumer_data.cmd_sock);
 212                 if (ret < 0) {
 213                         PERROR("kernel consumer cmd_sock close");
 214                 }
 215         }
 216         if (the_ustconsumer32_data.cmd_sock >= 0) {
 217                 ret = close(the_ustconsumer32_data.cmd_sock);
 218                 if (ret < 0) {
 219                         PERROR("UST consumerd32 cmd_sock close");
 220                 }
 221         }
 222         if (the_ustconsumer64_data.cmd_sock >= 0) {
 223                 ret = close(the_ustconsumer64_data.cmd_sock);
 224                 if (ret < 0) {
 225                         PERROR("UST consumerd64 cmd_sock close");
 226                 }
 227         }
 228         if (the_kconsumer_data.channel_monitor_pipe >= 0) {
 229                 ret = close(the_kconsumer_data.channel_monitor_pipe);
 230                 if (ret < 0) {
 231                         PERROR("kernel consumer channel monitor pipe close");
 232                 }
 233         }
 234         if (the_ustconsumer32_data.channel_monitor_pipe >= 0) {
 235                 ret = close(the_ustconsumer32_data.channel_monitor_pipe);
 236                 if (ret < 0) {
 237                         PERROR("UST consumerd32 channel monitor pipe close");
 238                 }
 239         }
 240         if (the_ustconsumer64_data.channel_monitor_pipe >= 0) {
 241                 ret = close(the_ustconsumer64_data.channel_monitor_pipe);
 242                 if (ret < 0) {
 243                         PERROR("UST consumerd64 channel monitor pipe close");
 244                 }
 245         }
 246 }
 247
 248 /*
 249  * Wait on consumer process termination.
 250  *
 251  * Need to be called with the consumer data lock held or from a context
 252  * ensuring no concurrent access to data (e.g: cleanup).
 253  */
 254 static void wait_consumer(struct consumer_data *consumer_data)
 255 {
 256         pid_t ret;
 257         int status;
 258
 259         if (consumer_data->pid <= 0) {
 260                 return;
 261         }
 262
 263         DBG("Waiting for complete teardown of consumerd (PID: %d)", consumer_data->pid);
 264         ret = waitpid(consumer_data->pid, &status, 0);
 265         if (ret == -1) {
 266                 PERROR("consumerd waitpid pid: %d", consumer_data->pid)
 267         } else if (!WIFEXITED(status)) {
 268                 ERR("consumerd termination with error: %d", WEXITSTATUS(ret));
 269         }
 270         consumer_data->pid = 0;
 271 }
 272
 273 /*
 274  * Cleanup the session daemon's data structures.
 275  */
 276 static void sessiond_cleanup()
 277 {
 278         int ret;
 279         struct ltt_session_list *session_list = session_get_list();
 280
 281         DBG("Cleanup sessiond");
 282
 283         /*
 284          * Close the main quit pipe. It has already done its job, since we are
 285          * now cleaning up.
 286          */
 287         sessiond_close_main_quit_pipe();
 288
 289         /* Close all other pipes. */
 290         utils_close_pipe(apps_cmd_pipe);
 291         utils_close_pipe(apps_cmd_notify_pipe);
 292         utils_close_pipe(the_kernel_poll_pipe);
 293
 294         ret = remove(the_config.pid_file_path.value);
 295         if (ret < 0) {
 296                 PERROR("remove pidfile %s", the_config.pid_file_path.value);
 297         }
 298
 299         DBG("Removing sessiond and consumerd content of directory %s", the_config.rundir.value);
 300
 301         /* sessiond */
 302         DBG("Removing %s", the_config.pid_file_path.value);
 303         (void) unlink(the_config.pid_file_path.value);
 304
 305         DBG("Removing %s", the_config.agent_port_file_path.value);
 306         (void) unlink(the_config.agent_port_file_path.value);
 307
 308         /* kconsumerd */
 309         DBG("Removing %s", the_kconsumer_data.err_unix_sock_path);
 310         (void) unlink(the_kconsumer_data.err_unix_sock_path);
 311
 312         DBG("Removing directory %s", the_config.kconsumerd_path.value);
 313         (void) rmdir(the_config.kconsumerd_path.value);
 314
 315         /* ust consumerd 32 */
 316         DBG("Removing %s", the_config.consumerd32_err_unix_sock_path.value);
 317         (void) unlink(the_config.consumerd32_err_unix_sock_path.value);
 318
 319         DBG("Removing directory %s", the_config.consumerd32_path.value);
 320         (void) rmdir(the_config.consumerd32_path.value);
 321
 322         /* ust consumerd 64 */
 323         DBG("Removing %s", the_config.consumerd64_err_unix_sock_path.value);
 324         (void) unlink(the_config.consumerd64_err_unix_sock_path.value);
 325
 326         DBG("Removing directory %s", the_config.consumerd64_path.value);
 327         (void) rmdir(the_config.consumerd64_path.value);
 328
 329         pthread_mutex_destroy(&session_list->lock);
 330
 331         DBG("Cleaning up all per-event notifier domain agents");
 332         agent_by_event_notifier_domain_ht_destroy();
 333
 334         DBG("Cleaning up all agent apps");
 335         agent_app_ht_clean();
 336         DBG("Closing all UST sockets");
 337         ust_app_clean_list();
 338         buffer_reg_destroy_registries();
 339
 340         close_consumer_sockets();
 341
 342         wait_consumer(&the_kconsumer_data);
 343         wait_consumer(&the_ustconsumer64_data);
 344         wait_consumer(&the_ustconsumer32_data);
 345
 346         if (is_root && !the_config.no_kernel) {
 347                 cleanup_kernel_tracer();
 348         }
 349
 350         /*
 351          * We do NOT rmdir rundir because there are other processes
 352          * using it, for instance lttng-relayd, which can start in
 353          * parallel with this teardown.
 354          */
 355 }
 356
 357 /*
 358  * Cleanup the daemon's option data structures.
 359  */
 360 static void sessiond_cleanup_options()
 361 {
 362         DBG("Cleaning up options");
 363
 364         sessiond_config_fini(&the_config);
 365
 366         run_as_destroy_worker();
 367 }
 368
 369 static int string_match(const char *str1, const char *str2)
 370 {
 371         return (str1 && str2) && !strcmp(str1, str2);
 372 }
 373
 374 /*
 375  * Take an option from the getopt output and set it in the right variable to be
 376  * used later.
 377  *
 378  * Return 0 on success else a negative value.
 379  */
 380 static int set_option(int opt, const char *arg, const char *optname)
 381 {
 382         int ret = 0;
 383
 384         if (string_match(optname, "client-sock") || opt == 'c') {
 385                 if (!arg || *arg == '\0') {
 386                         ret = -EINVAL;
 387                         goto end;
 388                 }
 389                 if (lttng_is_setuid_setgid()) {
 390                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 391                              "-c, --client-sock");
 392                 } else {
 393                         config_string_set(&the_config.client_unix_sock_path, strdup(arg));
 394                         if (!the_config.client_unix_sock_path.value) {
 395                                 ret = -ENOMEM;
 396                                 PERROR("strdup");
 397                         }
 398                 }
 399         } else if (string_match(optname, "apps-sock") || opt == 'a') {
 400                 if (!arg || *arg == '\0') {
 401                         ret = -EINVAL;
 402                         goto end;
 403                 }
 404                 if (lttng_is_setuid_setgid()) {
 405                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 406                              "-a, --apps-sock");
 407                 } else {
 408                         config_string_set(&the_config.apps_unix_sock_path, strdup(arg));
 409                         if (!the_config.apps_unix_sock_path.value) {
 410                                 ret = -ENOMEM;
 411                                 PERROR("strdup");
 412                         }
 413                 }
 414         } else if (string_match(optname, "daemonize") || opt == 'd') {
 415                 the_config.daemonize = true;
 416         } else if (string_match(optname, "background") || opt == 'b') {
 417                 the_config.background = true;
 418         } else if (string_match(optname, "group") || opt == 'g') {
 419                 if (!arg || *arg == '\0') {
 420                         ret = -EINVAL;
 421                         goto end;
 422                 }
 423                 if (lttng_is_setuid_setgid()) {
 424                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 425                              "-g, --group");
 426                 } else {
 427                         config_string_set(&the_config.tracing_group_name, strdup(arg));
 428                         if (!the_config.tracing_group_name.value) {
 429                                 ret = -ENOMEM;
 430                                 PERROR("strdup");
 431                         }
 432                 }
 433         } else if (string_match(optname, "help") || opt == 'h') {
 434                 ret = utils_show_help(8, "lttng-sessiond", help_msg);
 435                 if (ret) {
 436                         ERR("Cannot show --help for `lttng-sessiond`");
 437                         perror("exec");
 438                 }
 439                 exit(ret ? EXIT_FAILURE : EXIT_SUCCESS);
 440         } else if (string_match(optname, "version") || opt == 'V') {
 441                 opt_print_version = 1;
 442         } else if (string_match(optname, "sig-parent") || opt == 'S') {
 443                 the_config.sig_parent = true;
 444         } else if (string_match(optname, "kconsumerd-err-sock")) {
 445                 if (!arg || *arg == '\0') {
 446                         ret = -EINVAL;
 447                         goto end;
 448                 }
 449                 if (lttng_is_setuid_setgid()) {
 450                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 451                              "--kconsumerd-err-sock");
 452                 } else {
 453                         config_string_set(&the_config.kconsumerd_err_unix_sock_path, strdup(arg));
 454                         if (!the_config.kconsumerd_err_unix_sock_path.value) {
 455                                 ret = -ENOMEM;
 456                                 PERROR("strdup");
 457                         }
 458                 }
 459         } else if (string_match(optname, "kconsumerd-cmd-sock")) {
 460                 if (!arg || *arg == '\0') {
 461                         ret = -EINVAL;
 462                         goto end;
 463                 }
 464                 if (lttng_is_setuid_setgid()) {
 465                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 466                              "--kconsumerd-cmd-sock");
 467                 } else {
 468                         config_string_set(&the_config.kconsumerd_cmd_unix_sock_path, strdup(arg));
 469                         if (!the_config.kconsumerd_cmd_unix_sock_path.value) {
 470                                 ret = -ENOMEM;
 471                                 PERROR("strdup");
 472                         }
 473                 }
 474         } else if (string_match(optname, "ustconsumerd64-err-sock")) {
 475                 if (!arg || *arg == '\0') {
 476                         ret = -EINVAL;
 477                         goto end;
 478                 }
 479                 if (lttng_is_setuid_setgid()) {
 480                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 481                              "--ustconsumerd64-err-sock");
 482                 } else {
 483                         config_string_set(&the_config.consumerd64_err_unix_sock_path, strdup(arg));
 484                         if (!the_config.consumerd64_err_unix_sock_path.value) {
 485                                 ret = -ENOMEM;
 486                                 PERROR("strdup");
 487                         }
 488                 }
 489         } else if (string_match(optname, "ustconsumerd64-cmd-sock")) {
 490                 if (!arg || *arg == '\0') {
 491                         ret = -EINVAL;
 492                         goto end;
 493                 }
 494                 if (lttng_is_setuid_setgid()) {
 495                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 496                              "--ustconsumerd64-cmd-sock");
 497                 } else {
 498                         config_string_set(&the_config.consumerd64_cmd_unix_sock_path, strdup(arg));
 499                         if (!the_config.consumerd64_cmd_unix_sock_path.value) {
 500                                 ret = -ENOMEM;
 501                                 PERROR("strdup");
 502                         }
 503                 }
 504         } else if (string_match(optname, "ustconsumerd32-err-sock")) {
 505                 if (!arg || *arg == '\0') {
 506                         ret = -EINVAL;
 507                         goto end;
 508                 }
 509                 if (lttng_is_setuid_setgid()) {
 510                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 511                              "--ustconsumerd32-err-sock");
 512                 } else {
 513                         config_string_set(&the_config.consumerd32_err_unix_sock_path, strdup(arg));
 514                         if (!the_config.consumerd32_err_unix_sock_path.value) {
 515                                 ret = -ENOMEM;
 516                                 PERROR("strdup");
 517                         }
 518                 }
 519         } else if (string_match(optname, "ustconsumerd32-cmd-sock")) {
 520                 if (!arg || *arg == '\0') {
 521                         ret = -EINVAL;
 522                         goto end;
 523                 }
 524                 if (lttng_is_setuid_setgid()) {
 525                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 526                              "--ustconsumerd32-cmd-sock");
 527                 } else {
 528                         config_string_set(&the_config.consumerd32_cmd_unix_sock_path, strdup(arg));
 529                         if (!the_config.consumerd32_cmd_unix_sock_path.value) {
 530                                 ret = -ENOMEM;
 531                                 PERROR("strdup");
 532                         }
 533                 }
 534         } else if (string_match(optname, "no-kernel")) {
 535                 the_config.no_kernel = true;
 536         } else if (string_match(optname, "quiet") || opt == 'q') {
 537                 the_config.quiet = true;
 538         } else if (string_match(optname, "verbose") || opt == 'v') {
 539                 /* Verbose level can increase using multiple -v */
 540                 if (arg) {
 541                         /* Value obtained from config file */
 542                         the_config.verbose = config_parse_value(arg);
 543                 } else {
 544                         /* -v used on command line */
 545                         the_config.verbose++;
 546                 }
 547                 /* Clamp value to [0, 3] */
 548                 the_config.verbose = the_config.verbose < 0 ?
 549                         0 :
 550                         (the_config.verbose <= 3 ? the_config.verbose : 3);
 551         } else if (string_match(optname, "verbose-consumer")) {
 552                 if (arg) {
 553                         the_config.verbose_consumer = config_parse_value(arg);
 554                 } else {
 555                         the_config.verbose_consumer++;
 556                 }
 557         } else if (string_match(optname, "consumerd32-path")) {
 558                 if (!arg || *arg == '\0') {
 559                         ret = -EINVAL;
 560                         goto end;
 561                 }
 562                 if (lttng_is_setuid_setgid()) {
 563                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 564                              "--consumerd32-path");
 565                 } else {
 566                         config_string_set(&the_config.consumerd32_bin_path, strdup(arg));
 567                         if (!the_config.consumerd32_bin_path.value) {
 568                                 PERROR("strdup");
 569                                 ret = -ENOMEM;
 570                         }
 571                 }
 572         } else if (string_match(optname, "consumerd32-libdir")) {
 573                 if (!arg || *arg == '\0') {
 574                         ret = -EINVAL;
 575                         goto end;
 576                 }
 577                 if (lttng_is_setuid_setgid()) {
 578                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 579                              "--consumerd32-libdir");
 580                 } else {
 581                         config_string_set(&the_config.consumerd32_lib_dir, strdup(arg));
 582                         if (!the_config.consumerd32_lib_dir.value) {
 583                                 PERROR("strdup");
 584                                 ret = -ENOMEM;
 585                         }
 586                 }
 587         } else if (string_match(optname, "consumerd64-path")) {
 588                 if (!arg || *arg == '\0') {
 589                         ret = -EINVAL;
 590                         goto end;
 591                 }
 592                 if (lttng_is_setuid_setgid()) {
 593                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 594                              "--consumerd64-path");
 595                 } else {
 596                         config_string_set(&the_config.consumerd64_bin_path, strdup(arg));
 597                         if (!the_config.consumerd64_bin_path.value) {
 598                                 PERROR("strdup");
 599                                 ret = -ENOMEM;
 600                         }
 601                 }
 602         } else if (string_match(optname, "consumerd64-libdir")) {
 603                 if (!arg || *arg == '\0') {
 604                         ret = -EINVAL;
 605                         goto end;
 606                 }
 607                 if (lttng_is_setuid_setgid()) {
 608                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 609                              "--consumerd64-libdir");
 610                 } else {
 611                         config_string_set(&the_config.consumerd64_lib_dir, strdup(arg));
 612                         if (!the_config.consumerd64_lib_dir.value) {
 613                                 PERROR("strdup");
 614                                 ret = -ENOMEM;
 615                         }
 616                 }
 617         } else if (string_match(optname, "pidfile") || opt == 'p') {
 618                 if (!arg || *arg == '\0') {
 619                         ret = -EINVAL;
 620                         goto end;
 621                 }
 622                 if (lttng_is_setuid_setgid()) {
 623                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 624                              "-p, --pidfile");
 625                 } else {
 626                         config_string_set(&the_config.pid_file_path, strdup(arg));
 627                         if (!the_config.pid_file_path.value) {
 628                                 PERROR("strdup");
 629                                 ret = -ENOMEM;
 630                         }
 631                 }
 632         } else if (string_match(optname, "agent-tcp-port")) {
 633                 if (!arg || *arg == '\0') {
 634                         ret = -EINVAL;
 635                         goto end;
 636                 }
 637                 if (lttng_is_setuid_setgid()) {
 638                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 639                              "--agent-tcp-port");
 640                 } else {
 641                         unsigned long v;
 642
 643                         errno = 0;
 644                         v = strtoul(arg, nullptr, 0);
 645                         if (errno != 0 || !isdigit(arg[0])) {
 646                                 ERR("Wrong value in --agent-tcp-port parameter: %s", arg);
 647                                 return -1;
 648                         }
 649                         if (v == 0 || v >= 65535) {
 650                                 ERR("Port overflow in --agent-tcp-port parameter: %s", arg);
 651                                 return -1;
 652                         }
 653                         the_config.agent_tcp_port.begin = the_config.agent_tcp_port.end = (int) v;
 654                         DBG3("Agent TCP port set to non default: %i", (int) v);
 655                 }
 656         } else if (string_match(optname, "load") || opt == 'l') {
 657                 if (!arg || *arg == '\0') {
 658                         ret = -EINVAL;
 659                         goto end;
 660                 }
 661                 if (lttng_is_setuid_setgid()) {
 662                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 663                              "-l, --load");
 664                 } else {
 665                         config_string_set(&the_config.load_session_path, strdup(arg));
 666                         if (!the_config.load_session_path.value) {
 667                                 PERROR("strdup");
 668                                 ret = -ENOMEM;
 669                         }
 670                 }
 671         } else if (string_match(optname, "kmod-probes")) {
 672                 if (!arg || *arg == '\0') {
 673                         ret = -EINVAL;
 674                         goto end;
 675                 }
 676                 if (lttng_is_setuid_setgid()) {
 677                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 678                              "--kmod-probes");
 679                 } else {
 680                         config_string_set(&the_config.kmod_probes_list, strdup(arg));
 681                         if (!the_config.kmod_probes_list.value) {
 682                                 PERROR("strdup");
 683                                 ret = -ENOMEM;
 684                         }
 685                 }
 686         } else if (string_match(optname, "extra-kmod-probes")) {
 687                 if (!arg || *arg == '\0') {
 688                         ret = -EINVAL;
 689                         goto end;
 690                 }
 691                 if (lttng_is_setuid_setgid()) {
 692                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 693                              "--extra-kmod-probes");
 694                 } else {
 695                         config_string_set(&the_config.kmod_extra_probes_list, strdup(arg));
 696                         if (!the_config.kmod_extra_probes_list.value) {
 697                                 PERROR("strdup");
 698                                 ret = -ENOMEM;
 699                         }
 700                 }
 701         } else if (string_match(optname, EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR)) {
 702                 unsigned long v;
 703
 704                 errno = 0;
 705                 v = strtoul(arg, nullptr, 0);
 706                 if (errno != 0 || !isdigit(arg[0])) {
 707                         ERR("Wrong value in --%s parameter: %s",
 708                             EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR,
 709                             arg);
 710                         return -1;
 711                 }
 712                 if (v == 0 || v >= EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX) {
 713                         ERR("Value out of range for --%s parameter: %s",
 714                             EVENT_NOTIFIER_ERROR_BUFFER_SIZE_KERNEL_OPTION_STR,
 715                             arg);
 716                         return -1;
 717                 }
 718                 the_config.event_notifier_buffer_size_kernel = (int) v;
 719                 DBG3("Number of event notifier error buffer kernel size to non default: %i",
 720                      the_config.event_notifier_buffer_size_kernel);
 721                 goto end;
 722         } else if (string_match(optname, EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR)) {
 723                 unsigned long v;
 724
 725                 errno = 0;
 726                 v = strtoul(arg, nullptr, 0);
 727                 if (errno != 0 || !isdigit(arg[0])) {
 728                         ERR("Wrong value in --%s parameter: %s",
 729                             EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR,
 730                             arg);
 731                         return -1;
 732                 }
 733                 if (v == 0 || v >= EVENT_NOTIFIER_ERROR_COUNTER_NUMBER_OF_BUCKET_MAX) {
 734                         ERR("Value out of range for --%s parameter: %s",
 735                             EVENT_NOTIFIER_ERROR_BUFFER_SIZE_USERSPACE_OPTION_STR,
 736                             arg);
 737                         return -1;
 738                 }
 739                 the_config.event_notifier_buffer_size_userspace = (int) v;
 740                 DBG3("Number of event notifier error buffer userspace size to non default: %i",
 741                      the_config.event_notifier_buffer_size_userspace);
 742                 goto end;
 743         } else if (string_match(optname, "config") || opt == 'f') {
 744                 /* This is handled in set_options() thus silent skip. */
 745                 goto end;
 746         } else {
 747                 /* Unknown option or other error.
 748                  * Error is printed by getopt, just return */
 749                 ret = -1;
 750         }
 751
 752 end:
 753         if (ret == -EINVAL) {
 754                 const char *opt_name = "unknown";
 755                 int i;
 756
 757                 for (i = 0; i < sizeof(long_options) / sizeof(struct option); i++) {
 758                         if (opt == long_options[i].val) {
 759                                 opt_name = long_options[i].name;
 760                                 break;
 761                         }
 762                 }
 763
 764                 WARN("Invalid argument provided for option \"%s\", using default value.", opt_name);
 765         }
 766
 767         return ret;
 768 }
 769
 770 /*
 771  * config_entry_handler_cb used to handle options read from a config file.
 772  * See config_entry_handler_cb comment in common/config/session-config.h for the
 773  * return value conventions.
 774  */
 775 static int config_entry_handler(const struct config_entry *entry,
 776                                 void *unused __attribute__((unused)))
 777 {
 778         int ret = 0, i;
 779
 780         if (!entry || !entry->name || !entry->value) {
 781                 ret = -EINVAL;
 782                 goto end;
 783         }
 784
 785         /* Check if the option is to be ignored */
 786         for (i = 0; i < sizeof(config_ignore_options) / sizeof(char *); i++) {
 787                 if (!strcmp(entry->name, config_ignore_options[i])) {
 788                         goto end;
 789                 }
 790         }
 791
 792         for (i = 0; i < (sizeof(long_options) / sizeof(struct option)) - 1; i++) {
 793                 /* Ignore if not fully matched. */
 794                 if (strcmp(entry->name, long_options[i].name) != 0) {
 795                         continue;
 796                 }
 797
 798                 /*
 799                  * If the option takes no argument on the command line, we have to
 800                  * check if the value is "true". We support non-zero numeric values,
 801                  * true, on and yes.
 802                  */
 803                 if (!long_options[i].has_arg) {
 804                         ret = config_parse_value(entry->value);
 805                         if (ret <= 0) {
 806                                 if (ret) {
 807                                         WARN("Invalid configuration value \"%s\" for option %s",
 808                                              entry->value,
 809                                              entry->name);
 810                                 }
 811                                 /* False, skip boolean config option. */
 812                                 goto end;
 813                         }
 814                 }
 815
 816                 ret = set_option(long_options[i].val, entry->value, entry->name);
 817                 goto end;
 818         }
 819
 820         WARN("Unrecognized option \"%s\" in daemon configuration file.", entry->name);
 821
 822 end:
 823         return ret;
 824 }
 825
 826 static void print_version()
 827 {
 828         fprintf(stdout, "%s\n", VERSION);
 829 }
 830
 831 /*
 832  * daemon configuration loading and argument parsing
 833  */
 834 static int set_options(int argc, char **argv)
 835 {
 836         int ret = 0, c = 0, option_index = 0;
 837         int orig_optopt = optopt, orig_optind = optind;
 838         char *optstring;
 839         char *config_path = nullptr;
 840
 841         optstring = utils_generate_optstring(long_options,
 842                                              sizeof(long_options) / sizeof(struct option));
 843         if (!optstring) {
 844                 ret = -ENOMEM;
 845                 goto end;
 846         }
 847
 848         /* Check for the --config option */
 849         while ((c = getopt_long(argc, argv, optstring, long_options, &option_index)) != -1) {
 850                 if (c == '?') {
 851                         ret = -EINVAL;
 852                         goto end;
 853                 } else if (c != 'f') {
 854                         /* if not equal to --config option. */
 855                         continue;
 856                 }
 857
 858                 if (lttng_is_setuid_setgid()) {
 859                         WARN("Getting '%s' argument from setuid/setgid binary refused for security reasons.",
 860                              "-f, --config");
 861                 } else {
 862                         free(config_path);
 863                         config_path = utils_expand_path(optarg);
 864                         if (!config_path) {
 865                                 ERR("Failed to resolve path: %s", optarg);
 866                         }
 867                 }
 868         }
 869
 870         ret = config_get_section_entries(
 871                 config_path, config_section_name, config_entry_handler, nullptr);
 872         if (ret) {
 873                 if (ret > 0) {
 874                         ERR("Invalid configuration option at line %i", ret);
 875                         ret = -1;
 876                 }
 877                 goto end;
 878         }
 879
 880         /* Reset getopt's global state */
 881         optopt = orig_optopt;
 882         optind = orig_optind;
 883         while (true) {
 884                 option_index = -1;
 885                 /*
 886                  * getopt_long() will not set option_index if it encounters a
 887                  * short option.
 888                  */
 889                 c = getopt_long(argc, argv, optstring, long_options, &option_index);
 890                 if (c == -1) {
 891                         break;
 892                 }
 893
 894                 /*
 895                  * Pass NULL as the long option name if popt left the index
 896                  * unset.
 897                  */
 898                 ret = set_option(
 899                         c, optarg, option_index < 0 ? nullptr : long_options[option_index].name);
 900                 if (ret < 0) {
 901                         break;
 902                 }
 903         }
 904
 905 end:
 906         free(config_path);
 907         free(optstring);
 908         return ret;
 909 }
 910
 911 /*
 912  * Create lockfile using the rundir and return its fd.
 913  */
 914 static int create_lockfile()
 915 {
 916         return utils_create_lock_file(the_config.lock_file_path.value);
 917 }
 918
 919 /*
 920  * Check if the global socket is available, and if a daemon is answering at the
 921  * other side. If yes, error is returned.
 922  *
 923  * Also attempts to create and hold the lock file.
 924  */
 925 static int check_existing_daemon()
 926 {
 927         int ret = 0;
 928
 929         /* Is there anybody out there ? */
 930         if (lttng_session_daemon_alive()) {
 931                 ret = -EEXIST;
 932                 goto end;
 933         }
 934
 935         lockfile_fd = create_lockfile();
 936         if (lockfile_fd < 0) {
 937                 ret = -EEXIST;
 938                 goto end;
 939         }
 940 end:
 941         return ret;
 942 }
 943
 944 static void sessiond_cleanup_lock_file()
 945 {
 946         int ret;
 947
 948         /*
 949          * Cleanup lock file by deleting it and finaly closing it which will
 950          * release the file system lock.
 951          */
 952         if (lockfile_fd >= 0) {
 953                 ret = remove(the_config.lock_file_path.value);
 954                 if (ret < 0) {
 955                         PERROR("remove lock file");
 956                 }
 957                 ret = close(lockfile_fd);
 958                 if (ret < 0) {
 959                         PERROR("close lock file");
 960                 }
 961         }
 962 }
 963
 964 /*
 965  * Set the tracing group gid onto the client socket.
 966  *
 967  * Race window between mkdir and chown is OK because we are going from more
 968  * permissive (root.root) to less permissive (root.tracing).
 969  */
 970 static int set_permissions(char *rundir)
 971 {
 972         int ret;
 973         gid_t gid;
 974
 975         ret = utils_get_group_id(the_config.tracing_group_name.value, true, &gid);
 976         if (ret) {
 977                 /* Default to root group. */
 978                 gid = 0;
 979         }
 980
 981         /* Set lttng run dir */
 982         ret = chown(rundir, 0, gid);
 983         if (ret < 0) {
 984                 ERR("Unable to set group on %s", rundir);
 985                 PERROR("chown");
 986         }
 987
 988         /*
 989          * Ensure all applications and tracing group can search the run
 990          * dir. Allow everyone to read the directory, since it does not
 991          * buy us anything to hide its content.
 992          */
 993         ret = chmod(rundir, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH);
 994         if (ret < 0) {
 995                 ERR("Unable to set permissions on %s", rundir);
 996                 PERROR("chmod");
 997         }
 998
 999         /* lttng client socket path */
1000         ret = chown(the_config.client_unix_sock_path.value, 0, gid);
1001         if (ret < 0) {
1002                 ERR("Unable to set group on %s", the_config.client_unix_sock_path.value);
1003                 PERROR("chown");
1004         }
1005
1006         /* kconsumer error socket path */
1007         ret = chown(the_kconsumer_data.err_unix_sock_path, 0, 0);
1008         if (ret < 0) {
1009                 ERR("Unable to set group on %s", the_kconsumer_data.err_unix_sock_path);
1010                 PERROR("chown");
1011         }
1012
1013         /* 64-bit ustconsumer error socket path */
1014         ret = chown(the_ustconsumer64_data.err_unix_sock_path, 0, 0);
1015         if (ret < 0) {
1016                 ERR("Unable to set group on %s", the_ustconsumer64_data.err_unix_sock_path);
1017                 PERROR("chown");
1018         }
1019
1020         /* 32-bit ustconsumer compat32 error socket path */
1021         ret = chown(the_ustconsumer32_data.err_unix_sock_path, 0, 0);
1022         if (ret < 0) {
1023                 ERR("Unable to set group on %s", the_ustconsumer32_data.err_unix_sock_path);
1024                 PERROR("chown");
1025         }
1026
1027         DBG("All permissions are set");
1028
1029         return ret;
1030 }
1031
1032 /*
1033  * Create the lttng run directory needed for all global sockets and pipe.
1034  */
1035 static int create_lttng_rundir()
1036 {
1037         int ret;
1038
1039         DBG3("Creating LTTng run directory: %s", the_config.rundir.value);
1040
1041         ret = mkdir(the_config.rundir.value, S_IRWXU);
1042         if (ret < 0) {
1043                 if (errno != EEXIST) {
1044                         ERR("Unable to create %s", the_config.rundir.value);
1045                         goto error;
1046                 } else {
1047                         ret = 0;
1048                 }
1049         }
1050
1051 error:
1052         return ret;
1053 }
1054
1055 /*
1056  * Setup sockets and directory needed by the consumerds' communication with the
1057  * session daemon.
1058  */
1059 static int set_consumer_sockets(struct consumer_data *consumer_data)
1060 {
1061         int ret;
1062         char *path = nullptr;
1063
1064         switch (consumer_data->type) {
1065         case LTTNG_CONSUMER_KERNEL:
1066                 path = the_config.kconsumerd_path.value;
1067                 break;
1068         case LTTNG_CONSUMER64_UST:
1069                 path = the_config.consumerd64_path.value;
1070                 break;
1071         case LTTNG_CONSUMER32_UST:
1072                 path = the_config.consumerd32_path.value;
1073                 break;
1074         default:
1075                 ERR("Consumer type unknown");
1076                 ret = -EINVAL;
1077                 goto error;
1078         }
1079         LTTNG_ASSERT(path);
1080
1081         DBG2("Creating consumer directory: %s", path);
1082
1083         ret = mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP);
1084         if (ret < 0 && errno != EEXIST) {
1085                 PERROR("mkdir");
1086                 ERR("Failed to create %s", path);
1087                 goto error;
1088         }
1089         if (is_root) {
1090                 gid_t gid;
1091
1092                 ret = utils_get_group_id(the_config.tracing_group_name.value, true, &gid);
1093                 if (ret) {
1094                         /* Default to root group. */
1095                         gid = 0;
1096                 }
1097
1098                 ret = chown(path, 0, gid);
1099                 if (ret < 0) {
1100                         ERR("Unable to set group on %s", path);
1101                         PERROR("chown");
1102                         goto error;
1103                 }
1104         }
1105
1106         /* Create the consumerd error unix socket */
1107         consumer_data->err_sock = lttcomm_create_unix_sock(consumer_data->err_unix_sock_path);
1108         if (consumer_data->err_sock < 0) {
1109                 ERR("Create unix sock failed: %s", consumer_data->err_unix_sock_path);
1110                 ret = -1;
1111                 goto error;
1112         }
1113
1114         /*
1115          * Set the CLOEXEC flag. Return code is useless because either way, the
1116          * show must go on.
1117          */
1118         ret = utils_set_fd_cloexec(consumer_data->err_sock);
1119         if (ret < 0) {
1120                 PERROR("utils_set_fd_cloexec");
1121                 /* continue anyway */
1122         }
1123
1124         /* File permission MUST be 660 */
1125         ret = chmod(consumer_data->err_unix_sock_path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP);
1126         if (ret < 0) {
1127                 ERR("Set file permissions failed: %s", consumer_data->err_unix_sock_path);
1128                 PERROR("chmod");
1129                 goto error;
1130         }
1131
1132 error:
1133         return ret;
1134 }
1135
1136 /*
1137  * Signal handler for the daemon
1138  *
1139  * Simply stop all worker threads, leaving main() return gracefully after
1140  * joining all threads and calling cleanup().
1141  */
1142 static void sighandler(int sig, siginfo_t *siginfo, void *arg __attribute__((unused)))
1143 {
1144         switch (sig) {
1145         case SIGINT:
1146                 DBG("SIGINT caught");
1147                 notify_main_quit_pipe();
1148                 break;
1149         case SIGTERM:
1150                 DBG("SIGTERM caught");
1151                 notify_main_quit_pipe();
1152                 break;
1153         case SIGUSR1:
1154                 CMM_STORE_SHARED(recv_child_signal, 1);
1155                 break;
1156         case SIGBUS:
1157         {
1158                 int write_ret;
1159                 const char msg[] = "Received SIGBUS, aborting program.\n";
1160
1161                 lttng_ust_handle_sigbus(siginfo->si_addr);
1162                 /*
1163                  * If ustctl did not catch this signal (triggering a
1164                  * siglongjmp), abort the program. Otherwise, the execution
1165                  * will resume from the ust-ctl call which caused this error.
1166                  *
1167                  * The return value is ignored since the program aborts anyhow.
1168                  */
1169                 write_ret = write(STDERR_FILENO, msg, sizeof(msg));
1170                 (void) write_ret;
1171                 abort();
1172         }
1173         default:
1174                 break;
1175         }
1176 }
1177
1178 /*
1179  * Setup signal handler for :
1180  *              SIGINT, SIGTERM, SIGPIPE
1181  */
1182 static int set_signal_handler()
1183 {
1184         int ret = 0;
1185         struct sigaction sa;
1186         sigset_t sigset;
1187
1188         if ((ret = sigemptyset(&sigset)) < 0) {
1189                 PERROR("sigemptyset");
1190                 return ret;
1191         }
1192
1193         sa.sa_mask = sigset;
1194         sa.sa_flags = SA_SIGINFO;
1195
1196         sa.sa_sigaction = sighandler;
1197         if ((ret = sigaction(SIGTERM, &sa, nullptr)) < 0) {
1198                 PERROR("sigaction");
1199                 return ret;
1200         }
1201
1202         if ((ret = sigaction(SIGINT, &sa, nullptr)) < 0) {
1203                 PERROR("sigaction");
1204                 return ret;
1205         }
1206
1207         if ((ret = sigaction(SIGUSR1, &sa, nullptr)) < 0) {
1208                 PERROR("sigaction");
1209                 return ret;
1210         }
1211
1212         if ((ret = sigaction(SIGBUS, &sa, nullptr)) < 0) {
1213                 PERROR("sigaction");
1214                 return ret;
1215         }
1216
1217         sa.sa_flags = 0;
1218         sa.sa_handler = SIG_IGN;
1219         if ((ret = sigaction(SIGPIPE, &sa, nullptr)) < 0) {
1220                 PERROR("sigaction");
1221                 return ret;
1222         }
1223
1224         DBG("Signal handler set for SIGTERM, SIGUSR1, SIGPIPE, SIGINT, and SIGBUS");
1225
1226         return ret;
1227 }
1228
1229 /*
1230  * Set open files limit to unlimited. This daemon can open a large number of
1231  * file descriptors in order to consume multiple kernel traces.
1232  */
1233 static void set_ulimit()
1234 {
1235         int ret;
1236         struct rlimit lim;
1237
1238         /* The kernel does not allow an infinite limit for open files */
1239         lim.rlim_cur = 65535;
1240         lim.rlim_max = 65535;
1241
1242         ret = setrlimit(RLIMIT_NOFILE, &lim);
1243         if (ret < 0) {
1244                 PERROR("failed to set open files limit");
1245         }
1246 }
1247
1248 static int write_pidfile()
1249 {
1250         return utils_create_pid_file(getpid(), the_config.pid_file_path.value);
1251 }
1252
1253 static int set_clock_plugin_env()
1254 {
1255         int ret = 0;
1256         char *env_value = nullptr;
1257
1258         if (!the_config.lttng_ust_clock_plugin.value) {
1259                 goto end;
1260         }
1261
1262         ret = asprintf(
1263                 &env_value, "LTTNG_UST_CLOCK_PLUGIN=%s", the_config.lttng_ust_clock_plugin.value);
1264         if (ret < 0) {
1265                 PERROR("asprintf");
1266                 goto end;
1267         }
1268
1269         ret = putenv(env_value);
1270         if (ret) {
1271                 free(env_value);
1272                 PERROR("putenv of LTTNG_UST_CLOCK_PLUGIN");
1273                 goto end;
1274         }
1275
1276         DBG("Updated LTTNG_UST_CLOCK_PLUGIN environment variable to \"%s\"",
1277             the_config.lttng_ust_clock_plugin.value);
1278 end:
1279         return ret;
1280 }
1281
1282 static void destroy_all_sessions_and_wait()
1283 {
1284         struct ltt_session *session, *tmp;
1285         struct ltt_session_list *session_list;
1286
1287         session_list = session_get_list();
1288         DBG("Initiating destruction of all sessions");
1289
1290         if (!session_list) {
1291                 return;
1292         }
1293
1294         session_lock_list();
1295         /* Initiate the destruction of all sessions. */
1296         cds_list_for_each_entry_safe (session, tmp, &session_list->head, list) {
1297                 if (!session_get(session)) {
1298                         continue;
1299                 }
1300
1301                 session_lock(session);
1302                 if (session->destroyed) {
1303                         goto unlock_session;
1304                 }
1305                 (void) cmd_stop_trace(session);
1306                 (void) cmd_destroy_session(session, the_notification_thread_handle, nullptr);
1307         unlock_session:
1308                 session_unlock(session);
1309                 session_put(session);
1310         }
1311         session_unlock_list();
1312
1313         /* Wait for the destruction of all sessions to complete. */
1314         DBG("Waiting for the destruction of all sessions to complete");
1315         session_list_wait_empty();
1316         DBG("Destruction of all sessions completed");
1317 }
1318
1319 static void unregister_all_triggers()
1320 {
1321         enum lttng_error_code ret_code;
1322         enum lttng_trigger_status trigger_status;
1323         struct lttng_triggers *triggers = nullptr;
1324         unsigned int trigger_count, i;
1325         const struct lttng_credentials creds = {
1326                 .uid = LTTNG_OPTIONAL_INIT_VALUE(0),
1327                 .gid = LTTNG_OPTIONAL_INIT_UNSET,
1328         };
1329
1330         DBG("Unregistering all triggers");
1331
1332         /*
1333          * List all triggers as "root" since we wish to unregister all triggers.
1334          */
1335         ret_code = notification_thread_command_list_triggers(
1336                 the_notification_thread_handle, creds.uid.value, &triggers);
1337         if (ret_code != LTTNG_OK) {
1338                 ERR("Failed to list triggers while unregistering all triggers");
1339                 goto end;
1340         }
1341
1342         trigger_status = lttng_triggers_get_count(triggers, &trigger_count);
1343         LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK);
1344
1345         for (i = 0; i < trigger_count; i++) {
1346                 uid_t trigger_owner;
1347                 const char *trigger_name;
1348                 const struct lttng_trigger *trigger = lttng_triggers_get_at_index(triggers, i);
1349
1350                 LTTNG_ASSERT(trigger);
1351
1352                 trigger_status = lttng_trigger_get_owner_uid(trigger, &trigger_owner);
1353                 LTTNG_ASSERT(trigger_status == LTTNG_TRIGGER_STATUS_OK);
1354
1355                 trigger_status = lttng_trigger_get_name(trigger, &trigger_name);
1356                 trigger_name = trigger_status == LTTNG_TRIGGER_STATUS_OK ? trigger_name :
1357                                                                            "(anonymous)";
1358
1359                 DBG("Unregistering trigger: trigger owner uid = %d, trigger name = '%s'",
1360                     (int) trigger_owner,
1361                     trigger_name);
1362
1363                 ret_code = cmd_unregister_trigger(&creds, trigger, the_notification_thread_handle);
1364                 if (ret_code != LTTNG_OK) {
1365                         ERR("Failed to unregister trigger: trigger owner uid = %d, trigger name = '%s', error: '%s'",
1366                             (int) trigger_owner,
1367                             trigger_name,
1368                             lttng_strerror(-ret_code));
1369                         /* Continue to unregister the remaining triggers. */
1370                 }
1371         }
1372 end:
1373         lttng_triggers_destroy(triggers);
1374 }
1375
1376 static int run_as_worker_post_fork_cleanup(void *data)
1377 {
1378         struct sessiond_config *sessiond_config = (struct sessiond_config *) data;
1379
1380         sessiond_config_fini(sessiond_config);
1381         return 0;
1382 }
1383
1384 static int launch_run_as_worker(const char *procname)
1385 {
1386         /*
1387          * Clean-up before forking the run-as worker. Any dynamically
1388          * allocated memory of which the worker is not aware will
1389          * be leaked as the process forks a run-as worker (and performs
1390          * no exec*()). The same would apply to any opened fd.
1391          */
1392         return run_as_create_worker(procname, run_as_worker_post_fork_cleanup, &the_config);
1393 }
1394
1395 static void sessiond_uuid_log()
1396 {
1397         char uuid_str[LTTNG_UUID_STR_LEN];
1398
1399         lttng_uuid_to_str(the_sessiond_uuid, uuid_str);
1400         DBG("Starting lttng-sessiond {%s}", uuid_str);
1401 }
1402
1403 /*
1404  * main
1405  */
1406 int main(int argc, char **argv)
1407 {
1408         int ret = 0, retval = 0;
1409         const char *env_app_timeout;
1410         struct lttng_pipe *ust32_channel_monitor_pipe = nullptr,
1411                           *ust64_channel_monitor_pipe = nullptr,
1412                           *kernel_channel_monitor_pipe = nullptr;
1413         struct timer_thread_parameters timer_thread_parameters;
1414         /* Rotation thread handle. */
1415         struct rotation_thread_handle *rotation_thread_handle = nullptr;
1416         /* Queue of rotation jobs populated by the sessiond-timer. */
1417         struct rotation_thread_timer_queue *rotation_timer_queue = nullptr;
1418         struct lttng_thread *client_thread = nullptr;
1419         struct lttng_thread *notification_thread = nullptr;
1420         struct lttng_thread *register_apps_thread = nullptr;
1421         enum event_notifier_error_accounting_status event_notifier_error_accounting_status;
1422
1423         logger_set_thread_name("Main", false);
1424         init_kernel_workarounds();
1425
1426         rcu_register_thread();
1427
1428         if (set_signal_handler()) {
1429                 retval = -1;
1430                 goto exit_set_signal_handler;
1431         }
1432
1433         if (timer_signal_init()) {
1434                 retval = -1;
1435                 goto exit_set_signal_handler;
1436         }
1437
1438         the_page_size = sysconf(_SC_PAGE_SIZE);
1439         if (the_page_size < 0) {
1440                 PERROR("sysconf _SC_PAGE_SIZE");
1441                 the_page_size = LONG_MAX;
1442                 WARN("Fallback page size to %ld", the_page_size);
1443         }
1444
1445         ret = sessiond_config_init(&the_config);
1446         if (ret) {
1447                 retval = -1;
1448                 goto exit_set_signal_handler;
1449         }
1450
1451         /*
1452          * Init config from environment variables.
1453          * Command line option override env configuration per-doc. Do env first.
1454          */
1455         sessiond_config_apply_env_config(&the_config);
1456
1457         /*
1458          * Parse arguments and load the daemon configuration file.
1459          *
1460          * We have an exit_options exit path to free memory reserved by
1461          * set_options.
1462          */
1463         progname = argv[0];
1464         if (set_options(argc, argv)) {
1465                 retval = -1;
1466                 goto exit_options;
1467         }
1468
1469         /*
1470          * Resolve all paths received as arguments, configuration option, or
1471          * through environment variable as absolute paths. This is necessary
1472          * since daemonizing causes the sessiond's current working directory
1473          * to '/'.
1474          */
1475         ret = sessiond_config_resolve_paths(&the_config);
1476         if (ret) {
1477                 goto exit_options;
1478         }
1479
1480         /* Apply config. */
1481         lttng_opt_verbose = the_config.verbose;
1482         lttng_opt_quiet = the_config.quiet;
1483         the_kconsumer_data.err_unix_sock_path = the_config.kconsumerd_err_unix_sock_path.value;
1484         the_kconsumer_data.cmd_unix_sock_path = the_config.kconsumerd_cmd_unix_sock_path.value;
1485         the_ustconsumer32_data.err_unix_sock_path = the_config.consumerd32_err_unix_sock_path.value;
1486         the_ustconsumer32_data.cmd_unix_sock_path = the_config.consumerd32_cmd_unix_sock_path.value;
1487         the_ustconsumer64_data.err_unix_sock_path = the_config.consumerd64_err_unix_sock_path.value;
1488         the_ustconsumer64_data.cmd_unix_sock_path = the_config.consumerd64_cmd_unix_sock_path.value;
1489         set_clock_plugin_env();
1490
1491         sessiond_config_log(&the_config);
1492         sessiond_uuid_log();
1493         lttng::logging::log_system_information(PRINT_DBG);
1494
1495         if (opt_print_version) {
1496                 print_version();
1497                 retval = 0;
1498                 goto exit_options;
1499         }
1500
1501         if (create_lttng_rundir()) {
1502                 retval = -1;
1503                 goto exit_options;
1504         }
1505
1506         /* Abort launch if a session daemon is already running. */
1507         if (check_existing_daemon()) {
1508                 ERR("A session daemon is already running.");
1509                 retval = -1;
1510                 goto exit_options;
1511         }
1512
1513         /* Daemonize */
1514         if (the_config.daemonize || the_config.background) {
1515                 int i;
1516
1517                 ret = lttng_daemonize(&the_child_ppid, &recv_child_signal, !the_config.background);
1518                 if (ret < 0) {
1519                         retval = -1;
1520                         goto exit_options;
1521                 }
1522
1523                 /*
1524                  * We are in the child. Make sure all other file descriptors are
1525                  * closed, in case we are called with more opened file
1526                  * descriptors than the standard ones and the lock file.
1527                  */
1528                 for (i = 3; i < sysconf(_SC_OPEN_MAX); i++) {
1529                         if (i == lockfile_fd) {
1530                                 continue;
1531                         }
1532                         (void) close(i);
1533                 }
1534         }
1535
1536         if (launch_run_as_worker(argv[0]) < 0) {
1537                 goto exit_create_run_as_worker_cleanup;
1538         }
1539
1540         /*
1541          * Starting from here, we can create threads. This needs to be after
1542          * lttng_daemonize due to RCU.
1543          */
1544
1545         /*
1546          * Initialize the health check subsystem. This call should set the
1547          * appropriate time values.
1548          */
1549         the_health_sessiond = health_app_create(NR_HEALTH_SESSIOND_TYPES);
1550         if (!the_health_sessiond) {
1551                 PERROR("health_app_create error");
1552                 retval = -1;
1553                 goto stop_threads;
1554         }
1555
1556         /* Create main quit pipe */
1557         if (sessiond_init_main_quit_pipe()) {
1558                 retval = -1;
1559                 goto stop_threads;
1560         }
1561
1562         /* Check if daemon is UID = 0 */
1563         is_root = !getuid();
1564         if (is_root) {
1565                 /* Create global run dir with root access */
1566
1567                 kernel_channel_monitor_pipe = lttng_pipe_open(0);
1568                 if (!kernel_channel_monitor_pipe) {
1569                         ERR("Failed to create kernel consumer channel monitor pipe");
1570                         retval = -1;
1571                         goto stop_threads;
1572                 }
1573                 the_kconsumer_data.channel_monitor_pipe =
1574                         lttng_pipe_release_writefd(kernel_channel_monitor_pipe);
1575                 if (the_kconsumer_data.channel_monitor_pipe < 0) {
1576                         retval = -1;
1577                         goto stop_threads;
1578                 }
1579         }
1580
1581         /* Set consumer initial state */
1582         the_kernel_consumerd_state = CONSUMER_STOPPED;
1583         the_ust_consumerd_state = CONSUMER_STOPPED;
1584
1585         ust32_channel_monitor_pipe = lttng_pipe_open(0);
1586         if (!ust32_channel_monitor_pipe) {
1587                 ERR("Failed to create 32-bit user space consumer channel monitor pipe");
1588                 retval = -1;
1589                 goto stop_threads;
1590         }
1591         the_ustconsumer32_data.channel_monitor_pipe =
1592                 lttng_pipe_release_writefd(ust32_channel_monitor_pipe);
1593         if (the_ustconsumer32_data.channel_monitor_pipe < 0) {
1594                 retval = -1;
1595                 goto stop_threads;
1596         }
1597
1598         /*
1599          * The rotation_thread_timer_queue structure is shared between the
1600          * sessiond timer thread and the rotation thread. The main thread keeps
1601          * its ownership and destroys it when both threads have been joined.
1602          */
1603         rotation_timer_queue = rotation_thread_timer_queue_create();
1604         if (!rotation_timer_queue) {
1605                 retval = -1;
1606                 goto stop_threads;
1607         }
1608         timer_thread_parameters.rotation_thread_job_queue = rotation_timer_queue;
1609
1610         ust64_channel_monitor_pipe = lttng_pipe_open(0);
1611         if (!ust64_channel_monitor_pipe) {
1612                 ERR("Failed to create 64-bit user space consumer channel monitor pipe");
1613                 retval = -1;
1614                 goto stop_threads;
1615         }
1616         the_ustconsumer64_data.channel_monitor_pipe =
1617                 lttng_pipe_release_writefd(ust64_channel_monitor_pipe);
1618         if (the_ustconsumer64_data.channel_monitor_pipe < 0) {
1619                 retval = -1;
1620                 goto stop_threads;
1621         }
1622
1623         /*
1624          * Init UST app hash table. Alloc hash table before this point since
1625          * cleanup() can get called after that point.
1626          */
1627         if (ust_app_ht_alloc()) {
1628                 ERR("Failed to allocate UST app hash table");
1629                 retval = -1;
1630                 goto stop_threads;
1631         }
1632
1633         event_notifier_error_accounting_status = event_notifier_error_accounting_init(
1634                 the_config.event_notifier_buffer_size_kernel,
1635                 the_config.event_notifier_buffer_size_userspace);
1636         if (event_notifier_error_accounting_status != EVENT_NOTIFIER_ERROR_ACCOUNTING_STATUS_OK) {
1637                 ERR("Failed to initialize event notifier error accounting system");
1638                 retval = -1;
1639                 goto stop_threads;
1640         }
1641
1642         /*
1643          * Initialize agent app hash table. We allocate the hash table here
1644          * since cleanup() can get called after this point.
1645          */
1646         if (agent_app_ht_alloc()) {
1647                 ERR("Failed to allocate Agent app hash table");
1648                 retval = -1;
1649                 goto stop_threads;
1650         }
1651
1652         if (agent_by_event_notifier_domain_ht_create()) {
1653                 ERR("Failed to allocate per-event notifier domain agent hash table");
1654                 retval = -1;
1655                 goto stop_threads;
1656         }
1657         /*
1658          * These actions must be executed as root. We do that *after* setting up
1659          * the sockets path because we MUST make the check for another daemon using
1660          * those paths *before* trying to set the kernel consumer sockets and init
1661          * kernel tracer.
1662          */
1663         if (is_root) {
1664                 if (set_consumer_sockets(&the_kconsumer_data)) {
1665                         retval = -1;
1666                         goto stop_threads;
1667                 }
1668
1669                 /* Setup kernel tracer */
1670                 if (!the_config.no_kernel) {
1671                         init_kernel_tracer();
1672                 }
1673
1674                 /* Set ulimit for open files */
1675                 set_ulimit();
1676         }
1677         /* init lttng_fd tracking must be done after set_ulimit. */
1678         lttng_fd_init();
1679
1680         if (set_consumer_sockets(&the_ustconsumer64_data)) {
1681                 retval = -1;
1682                 goto stop_threads;
1683         }
1684
1685         if (set_consumer_sockets(&the_ustconsumer32_data)) {
1686                 retval = -1;
1687                 goto stop_threads;
1688         }
1689
1690         /* Get parent pid if -S, --sig-parent is specified. */
1691         if (the_config.sig_parent) {
1692                 the_ppid = getppid();
1693         }
1694
1695         /* Setup the kernel pipe for waking up the kernel thread */
1696         if (is_root && !the_config.no_kernel) {
1697                 if (utils_create_pipe_cloexec(the_kernel_poll_pipe)) {
1698                         retval = -1;
1699                         goto stop_threads;
1700                 }
1701         }
1702
1703         /* Setup the thread apps communication pipe. */
1704         if (utils_create_pipe_cloexec(apps_cmd_pipe)) {
1705                 retval = -1;
1706                 goto stop_threads;
1707         }
1708
1709         /* Setup the thread apps notify communication pipe. */
1710         if (utils_create_pipe_cloexec(apps_cmd_notify_pipe)) {
1711                 retval = -1;
1712                 goto stop_threads;
1713         }
1714
1715         /* Initialize global buffer per UID and PID registry. */
1716         buffer_reg_init_uid_registry();
1717         buffer_reg_init_pid_registry();
1718
1719         /* Init UST command queue. */
1720         cds_wfcq_init(&ust_cmd_queue.head, &ust_cmd_queue.tail);
1721
1722         cmd_init();
1723
1724         /* Check for the application socket timeout env variable. */
1725         env_app_timeout = getenv(DEFAULT_APP_SOCKET_TIMEOUT_ENV);
1726         if (env_app_timeout) {
1727                 the_config.app_socket_timeout = atoi(env_app_timeout);
1728         } else {
1729                 the_config.app_socket_timeout = DEFAULT_APP_SOCKET_RW_TIMEOUT;
1730         }
1731
1732         ret = write_pidfile();
1733         if (ret) {
1734                 ERR("Error in write_pidfile");
1735                 retval = -1;
1736                 goto stop_threads;
1737         }
1738
1739         /* Initialize communication library */
1740         lttcomm_init();
1741         /* Initialize TCP timeout values */
1742         lttcomm_inet_init();
1743
1744         /* Create health-check thread. */
1745         if (!launch_health_management_thread()) {
1746                 retval = -1;
1747                 goto stop_threads;
1748         }
1749
1750         /* notification_thread_data acquires the pipes' read side. */
1751         the_notification_thread_handle =
1752                 notification_thread_handle_create(ust32_channel_monitor_pipe,
1753                                                   ust64_channel_monitor_pipe,
1754                                                   kernel_channel_monitor_pipe);
1755         if (!the_notification_thread_handle) {
1756                 retval = -1;
1757                 ERR("Failed to create notification thread shared data");
1758                 goto stop_threads;
1759         }
1760
1761         /* Create notification thread. */
1762         notification_thread = launch_notification_thread(the_notification_thread_handle);
1763         if (!notification_thread) {
1764                 retval = -1;
1765                 goto stop_threads;
1766         }
1767
1768         /* Create timer thread. */
1769         if (!launch_timer_thread(&timer_thread_parameters)) {
1770                 retval = -1;
1771                 goto stop_threads;
1772         }
1773
1774         /* rotation_thread_data acquires the pipes' read side. */
1775         rotation_thread_handle =
1776                 rotation_thread_handle_create(rotation_timer_queue, the_notification_thread_handle);
1777         if (!rotation_thread_handle) {
1778                 retval = -1;
1779                 ERR("Failed to create rotation thread shared data");
1780                 goto stop_threads;
1781         }
1782
1783         /* Create rotation thread. */
1784         if (!launch_rotation_thread(rotation_thread_handle)) {
1785                 retval = -1;
1786                 goto stop_threads;
1787         }
1788
1789         /* Create thread to manage the client socket */
1790         client_thread = launch_client_thread();
1791         if (!client_thread) {
1792                 retval = -1;
1793                 goto stop_threads;
1794         }
1795
1796         /* Set credentials of the client socket and rundir */
1797         if (is_root && set_permissions(the_config.rundir.value)) {
1798                 retval = -1;
1799                 goto stop_threads;
1800         }
1801
1802         if (!launch_ust_dispatch_thread(&ust_cmd_queue, apps_cmd_pipe[1], apps_cmd_notify_pipe[1])) {
1803                 retval = -1;
1804                 goto stop_threads;
1805         }
1806
1807         /* Create thread to manage application registration. */
1808         register_apps_thread = launch_application_registration_thread(&ust_cmd_queue);
1809         if (!register_apps_thread) {
1810                 retval = -1;
1811                 goto stop_threads;
1812         }
1813
1814         /* Create thread to manage application socket */
1815         if (!launch_application_management_thread(apps_cmd_pipe[0])) {
1816                 retval = -1;
1817                 goto stop_threads;
1818         }
1819
1820         /* Create thread to manage application notify socket */
1821         if (!launch_application_notification_thread(apps_cmd_notify_pipe[0])) {
1822                 retval = -1;
1823                 goto stop_threads;
1824         }
1825
1826         /* Create agent management thread. */
1827         if (!launch_agent_management_thread()) {
1828                 retval = -1;
1829                 goto stop_threads;
1830         }
1831
1832         /* Don't start this thread if kernel tracing is not requested nor root */
1833         if (is_root && !the_config.no_kernel) {
1834                 /* Create kernel thread to manage kernel event */
1835                 if (!launch_kernel_management_thread(the_kernel_poll_pipe[0])) {
1836                         retval = -1;
1837                         goto stop_threads;
1838                 }
1839
1840                 if (kernel_get_notification_fd() >= 0) {
1841                         ret = notification_thread_command_add_tracer_event_source(
1842                                 the_notification_thread_handle,
1843                                 kernel_get_notification_fd(),
1844                                 LTTNG_DOMAIN_KERNEL);
1845                         if (ret != LTTNG_OK) {
1846                                 ERR("Failed to add kernel trigger event source to notification thread");
1847                                 retval = -1;
1848                                 goto stop_threads;
1849                         }
1850                 }
1851         }
1852
1853         /* Load sessions. */
1854         ret = config_load_session(the_config.load_session_path.value, nullptr, 1, 1, nullptr);
1855         if (ret) {
1856                 ERR("Session load failed: %s", error_get_str(ret));
1857                 retval = -1;
1858                 goto stop_threads;
1859         }
1860
1861         /* Initialization completed. */
1862         sessiond_signal_parents();
1863
1864         /*
1865          * This is where we start awaiting program completion (e.g. through
1866          * signal that asks threads to teardown).
1867          */
1868
1869         /* Initiate teardown once activity occurs on the main quit pipe. */
1870         sessiond_wait_for_main_quit_pipe(-1);
1871
1872 stop_threads:
1873
1874         DBG("Terminating all threads");
1875
1876         /*
1877          * Ensure that the client thread is no longer accepting new commands,
1878          * which could cause new sessions to be created.
1879          */
1880         if (client_thread) {
1881                 lttng_thread_shutdown(client_thread);
1882                 lttng_thread_put(client_thread);
1883         }
1884
1885         destroy_all_sessions_and_wait();
1886
1887         /*
1888          * At this point no new trigger can be registered (no sessions are
1889          * running/rotating) and clients can't connect to the session daemon
1890          * anymore. Unregister all triggers.
1891          */
1892         unregister_all_triggers();
1893
1894         if (register_apps_thread) {
1895                 lttng_thread_shutdown(register_apps_thread);
1896                 lttng_thread_put(register_apps_thread);
1897         }
1898         lttng_thread_list_shutdown_orphans();
1899
1900         /*
1901          * Wait for all pending call_rcu work to complete before tearing
1902          * down data structures. call_rcu worker may be trying to
1903          * perform lookups in those structures.
1904          */
1905         rcu_barrier();
1906
1907         rcu_thread_online();
1908         sessiond_cleanup();
1909
1910         /*
1911          * Wait for all pending call_rcu work to complete before shutting down
1912          * the notification thread. This call_rcu work includes shutting down
1913          * UST apps and event notifier pipes.
1914          */
1915         rcu_barrier();
1916
1917         if (notification_thread) {
1918                 lttng_thread_shutdown(notification_thread);
1919                 lttng_thread_put(notification_thread);
1920         }
1921
1922         /*
1923          * Error accounting teardown has to be done after the teardown of all
1924          * event notifier pipes to ensure that no tracer may try to use the
1925          * error accounting facilities.
1926          */
1927         event_notifier_error_accounting_fini();
1928
1929         /*
1930          * Unloading the kernel modules needs to be done after all kernel
1931          * ressources have been released. In our case, this includes the
1932          * notification fd, the event notifier group fd, error accounting fd,
1933          * all event and event notifier fds, etc.
1934          *
1935          * In short, at this point, we need to have called close() on all fds
1936          * received from the kernel tracer.
1937          */
1938         if (is_root && !the_config.no_kernel) {
1939                 DBG("Unloading kernel modules");
1940                 modprobe_remove_lttng_all();
1941         }
1942
1943         rcu_thread_offline();
1944         rcu_unregister_thread();
1945
1946         if (rotation_thread_handle) {
1947                 rotation_thread_handle_destroy(rotation_thread_handle);
1948         }
1949
1950         /*
1951          * After the rotation and timer thread have quit, we can safely destroy
1952          * the rotation_timer_queue.
1953          */
1954         rotation_thread_timer_queue_destroy(rotation_timer_queue);
1955         /*
1956          * The teardown of the notification system is performed after the
1957          * session daemon's teardown in order to allow it to be notified
1958          * of the active session and channels at the moment of the teardown.
1959          */
1960         if (the_notification_thread_handle) {
1961                 notification_thread_handle_destroy(the_notification_thread_handle);
1962         }
1963         lttng_pipe_destroy(ust32_channel_monitor_pipe);
1964         lttng_pipe_destroy(ust64_channel_monitor_pipe);
1965         lttng_pipe_destroy(kernel_channel_monitor_pipe);
1966
1967         if (the_health_sessiond) {
1968                 health_app_destroy(the_health_sessiond);
1969         }
1970 exit_create_run_as_worker_cleanup:
1971 exit_options:
1972         sessiond_cleanup_lock_file();
1973         sessiond_cleanup_options();
1974
1975 exit_set_signal_handler:
1976         if (!retval) {
1977                 exit(EXIT_SUCCESS);
1978         } else {
1979                 exit(EXIT_FAILURE);
1980         }
1981 }