src/main.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <unistd.h>
   7 #include <signal.h>
   8 #include <syslog.h>
   9 #include <pthread.h>
  10 #include <string.h>
  11 #include <errno.h>
  12 #include <sys/types.h>
  13 #include <sys/wait.h>
  14 #include <sys/time.h>
  15 #include <sys/resource.h>
  16 #include <sys/mman.h>
  17 #include <sys/prctl.h>
  18
  19 #include "common.h"
  20 #include "log.h"
  21 #include "daemon.h"
  22 #include "web_server.h"
  23 #include "popen.h"
  24 #include "appconfig.h"
  25 #include "web_client.h"
  26 #include "rrd.h"
  27 #include "rrd2json.h"
  28
  29 #include "unit_test.h"
  30
  31 #include "plugins_d.h"
  32 #include "plugin_idlejitter.h"
  33 #include "plugin_tc.h"
  34 #include "plugin_checks.h"
  35 #include "plugin_proc.h"
  36 #include "plugin_nfacct.h"
  37
  38 #include "main.h"
  39
  40 extern void *cgroups_main(void *ptr);
  41
  42 volatile sig_atomic_t netdata_exit = 0;
  43
  44 void netdata_cleanup_and_exit(int ret)
  45 {
  46         netdata_exit = 1;
  47         rrdset_save_all();
  48         // kill_childs();
  49
  50         // let it log a few more error messages
  51         error_log_limit_reset();
  52
  53         if(pidfd != -1) {
  54                 if(ftruncate(pidfd, 0) != 0)
  55                         error("Cannot truncate pidfile '%s'.", pidfile);
  56
  57                 close(pidfd);
  58                 pidfd = -1;
  59         }
  60
  61         if(pidfile[0]) {
  62                 if(unlink(pidfile) != 0)
  63                         error("Cannot unlink pidfile '%s'.", pidfile);
  64         }
  65
  66         info("NetData exiting. Bye bye...");
  67         exit(ret);
  68 }
  69
  70 struct netdata_static_thread {
  71         char *name;
  72
  73         char *config_section;
  74         char *config_name;
  75
  76         int enabled;
  77
  78         pthread_t *thread;
  79
  80         void (*init_routine) (void);
  81         void *(*start_routine) (void *);
  82 };
  83
  84 struct netdata_static_thread static_threads[] = {
  85         {"tc",                  "plugins",      "tc",                   1, NULL, NULL,  tc_main},
  86         {"idlejitter",  "plugins",      "idlejitter",   1, NULL, NULL,  cpuidlejitter_main},
  87         {"proc",                "plugins",      "proc",                 1, NULL, NULL,  proc_main},
  88         {"cgroups",             "plugins",      "cgroups",              1, NULL, NULL,  cgroups_main},
  89
  90 #ifdef INTERNAL_PLUGIN_NFACCT
  91         // nfacct requires root access
  92         // so, we build it as an external plugin with setuid to root
  93         {"nfacct",              "plugins",      "nfacct",               1, NULL, NULL,  nfacct_main},
  94 #endif
  95
  96         {"plugins.d",   NULL,           NULL,                   1, NULL, NULL,  pluginsd_main},
  97         {"check",               "plugins",      "checks",               0, NULL, NULL,  checks_main},
  98         {"web",                 NULL,           NULL,                   1, NULL, NULL,  socket_listen_main},
  99         {NULL,                  NULL,           NULL,                   0, NULL, NULL,  NULL}
 100 };
 101
 102 int killpid(pid_t pid, int sig)
 103 {
 104         int ret = -1;
 105         debug(D_EXIT, "Request to kill pid %d", pid);
 106
 107         errno = 0;
 108         if(kill(pid, 0) == -1) {
 109                 switch(errno) {
 110                         case ESRCH:
 111                                 error("Request to kill pid %d, but it is not running.", pid);
 112                                 break;
 113
 114                         case EPERM:
 115                                 error("Request to kill pid %d, but I do not have enough permissions.", pid);
 116                                 break;
 117
 118                         default:
 119                                 error("Request to kill pid %d, but I received an error.", pid);
 120                                 break;
 121                 }
 122         }
 123         else {
 124                 errno = 0;
 125                 ret = kill(pid, sig);
 126                 if(ret == -1) {
 127                         switch(errno) {
 128                                 case ESRCH:
 129                                         error("Cannot kill pid %d, but it is not running.", pid);
 130                                         break;
 131
 132                                 case EPERM:
 133                                         error("Cannot kill pid %d, but I do not have enough permissions.", pid);
 134                                         break;
 135
 136                                 default:
 137                                         error("Cannot kill pid %d, but I received an error.", pid);
 138                                         break;
 139                         }
 140                 }
 141         }
 142
 143         return ret;
 144 }
 145
 146 void kill_childs()
 147 {
 148         siginfo_t info;
 149
 150         struct web_client *w;
 151         for(w = web_clients; w ; w = w->next) {
 152                 debug(D_EXIT, "Stopping web client %s", w->client_ip);
 153                 pthread_cancel(w->thread);
 154                 pthread_join(w->thread, NULL);
 155         }
 156
 157         int i;
 158         for (i = 0; static_threads[i].name != NULL ; i++) {
 159                 if(static_threads[i].thread) {
 160                         debug(D_EXIT, "Stopping %s thread", static_threads[i].name);
 161                         pthread_cancel(*static_threads[i].thread);
 162                         pthread_join(*static_threads[i].thread, NULL);
 163                         static_threads[i].thread = NULL;
 164                 }
 165         }
 166
 167         if(tc_child_pid) {
 168                 info("Killing tc-qos-helper procees");
 169                 if(killpid(tc_child_pid, SIGTERM) != -1)
 170                         waitid(P_PID, (id_t) tc_child_pid, &info, WEXITED);
 171         }
 172         tc_child_pid = 0;
 173
 174         struct plugind *cd;
 175         for(cd = pluginsd_root ; cd ; cd = cd->next) {
 176                 debug(D_EXIT, "Stopping %s plugin thread", cd->id);
 177                 pthread_cancel(cd->thread);
 178                 pthread_join(cd->thread, NULL);
 179
 180                 if(cd->pid && !cd->obsolete) {
 181                         debug(D_EXIT, "killing %s plugin process", cd->id);
 182                         if(killpid(cd->pid, SIGTERM) != -1)
 183                                 waitid(P_PID, (id_t) cd->pid, &info, WEXITED);
 184                 }
 185         }
 186
 187         // if, for any reason there is any child exited
 188         // catch it here
 189         waitid(P_PID, 0, &info, WEXITED|WNOHANG);
 190
 191         debug(D_EXIT, "All threads/childs stopped.");
 192 }
 193
 194
 195 int main(int argc, char **argv)
 196 {
 197         int i;
 198         int config_loaded = 0;
 199         int dont_fork = 0;
 200         size_t wanted_stacksize = 0, stacksize = 0;
 201         pthread_attr_t attr;
 202
 203         // global initialization
 204         get_HZ();
 205
 206         // set the name for logging
 207         program_name = "netdata";
 208
 209         // parse  the arguments
 210         for(i = 1; i < argc ; i++) {
 211                 if(strcmp(argv[i], "-c") == 0 && (i+1) < argc) {
 212                         if(load_config(argv[i+1], 1) != 1) {
 213                                 error("Cannot load configuration file %s.", argv[i+1]);
 214                                 exit(1);
 215                         }
 216                         else {
 217                                 debug(D_OPTIONS, "Configuration loaded from %s.", argv[i+1]);
 218                                 config_loaded = 1;
 219                         }
 220                         i++;
 221                 }
 222                 else if(strcmp(argv[i], "-df") == 0 && (i+1) < argc) { config_set("global", "debug flags",  argv[i+1]); debug_flags = strtoull(argv[i+1], NULL, 0); i++; }
 223                 else if(strcmp(argv[i], "-p")  == 0 && (i+1) < argc) { config_set("global", "port",         argv[i+1]); i++; }
 224                 else if(strcmp(argv[i], "-u")  == 0 && (i+1) < argc) { config_set("global", "run as user",  argv[i+1]); i++; }
 225                 else if(strcmp(argv[i], "-l")  == 0 && (i+1) < argc) { config_set("global", "history",      argv[i+1]); i++; }
 226                 else if(strcmp(argv[i], "-t")  == 0 && (i+1) < argc) { config_set("global", "update every", argv[i+1]); i++; }
 227                 else if(strcmp(argv[i], "-ch") == 0 && (i+1) < argc) { config_set("global", "host access prefix", argv[i+1]); i++; }
 228                 else if(strcmp(argv[i], "-stacksize") == 0 && (i+1) < argc) { config_set("global", "pthread stack size", argv[i+1]); i++; }
 229                 else if(strcmp(argv[i], "-nodaemon") == 0 || strcmp(argv[i], "-nd") == 0) dont_fork = 1;
 230                 else if(strcmp(argv[i], "-pidfile") == 0 && (i+1) < argc) {
 231                         i++;
 232                         strncpy(pidfile, argv[i], FILENAME_MAX);
 233                         pidfile[FILENAME_MAX] = '\0';
 234                 }
 235                 else if(strcmp(argv[i], "--unittest")  == 0) {
 236                         rrd_update_every = 1;
 237                         if(run_all_mockup_tests()) exit(1);
 238                         if(unit_test_storage()) exit(1);
 239                         fprintf(stderr, "\n\nALL TESTS PASSED\n\n");
 240                         exit(0);
 241                 }
 242                 else {
 243                         fprintf(stderr, "Cannot understand option '%s'.\n", argv[i]);
 244                         fprintf(stderr, "\nUSAGE: %s [-d] [-l LINES_TO_SAVE] [-u UPDATE_TIMER] [-p LISTEN_PORT] [-df debug flags].\n\n", argv[0]);
 245                         fprintf(stderr, "  -c CONFIG FILE the configuration file to load. Default: %s.\n", CONFIG_DIR "/" CONFIG_FILENAME);
 246                         fprintf(stderr, "  -l LINES_TO_SAVE can be from 5 to %d lines in JSON data. Default: %d.\n", RRD_HISTORY_ENTRIES_MAX, RRD_DEFAULT_HISTORY_ENTRIES);
 247                         fprintf(stderr, "  -t UPDATE_TIMER can be from 1 to %d seconds. Default: %d.\n", UPDATE_EVERY_MAX, UPDATE_EVERY);
 248                         fprintf(stderr, "  -p LISTEN_PORT can be from 1 to %d. Default: %d.\n", 65535, LISTEN_PORT);
 249                         fprintf(stderr, "  -u USERNAME can be any system username to run as. Default: none.\n");
 250                         fprintf(stderr, "  -ch path to access host /proc and /sys when running in a container. Default: empty.\n");
 251                         fprintf(stderr, "  -nd or -nodeamon to disable forking in the background. Default: unset.\n");
 252                         fprintf(stderr, "  -df FLAGS debug options. Default: 0x%08llx.\n", debug_flags);
 253                         fprintf(stderr, "  -stacksize BYTES to overwrite the pthread stack size.\n");
 254                         fprintf(stderr, "  -pidfile FILENAME to save a pid while running.\n");
 255                         exit(1);
 256                 }
 257         }
 258
 259         if(!config_loaded) load_config(NULL, 0);
 260
 261         // prepare configuration environment variables for the plugins
 262         setenv("NETDATA_CONFIG_DIR" , config_get("global", "config directory"   , CONFIG_DIR) , 1);
 263         setenv("NETDATA_PLUGINS_DIR", config_get("global", "plugins directory"  , PLUGINS_DIR), 1);
 264         setenv("NETDATA_WEB_DIR"    , config_get("global", "web files directory", WEB_DIR)    , 1);
 265         setenv("NETDATA_CACHE_DIR"  , config_get("global", "cache directory"    , CACHE_DIR)  , 1);
 266         setenv("NETDATA_LOG_DIR"    , config_get("global", "log directory"      , LOG_DIR)    , 1);
 267         setenv("NETDATA_HOST_PREFIX", config_get("global", "host access prefix" , "")         , 1);
 268         setenv("HOME"               , config_get("global", "home directory"     , CACHE_DIR)  , 1);
 269
 270         // avoid extended to stat(/etc/localtime)
 271         // http://stackoverflow.com/questions/4554271/how-to-avoid-excessive-stat-etc-localtime-calls-in-strftime-on-linux
 272         setenv("TZ", ":/etc/localtime", 0);
 273
 274         // cd to /tmp to avoid any plugins writing files at random places
 275         if(chdir("/tmp")) error("netdata: ERROR: Cannot cd to /tmp");
 276
 277         char *input_log_file = NULL;
 278         char *output_log_file = NULL;
 279         char *error_log_file = NULL;
 280         char *access_log_file = NULL;
 281         char *user = NULL;
 282         {
 283                 char buffer[1024];
 284
 285                 // --------------------------------------------------------------------
 286
 287                 sprintf(buffer, "0x%08llx", 0ULL);
 288                 char *flags = config_get("global", "debug flags", buffer);
 289                 setenv("NETDATA_DEBUG_FLAGS", flags, 1);
 290
 291                 debug_flags = strtoull(flags, NULL, 0);
 292                 debug(D_OPTIONS, "Debug flags set to '0x%8llx'.", debug_flags);
 293
 294                 if(debug_flags != 0) {
 295                         struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
 296                         if(setrlimit(RLIMIT_CORE, &rl) != 0)
 297                                 info("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
 298                         prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
 299                 }
 300
 301                 // --------------------------------------------------------------------
 302
 303 #ifdef MADV_MERGEABLE
 304                 enable_ksm = config_get_boolean("global", "memory deduplication (ksm)", enable_ksm);
 305 #else
 306 #warning "Kernel memory deduplication (KSM) is not available"
 307 #endif
 308
 309                 // --------------------------------------------------------------------
 310
 311
 312                 global_host_prefix = config_get("global", "host access prefix", "");
 313                 setenv("NETDATA_HOST_PREFIX", global_host_prefix, 1);
 314
 315                 // --------------------------------------------------------------------
 316
 317                 output_log_file = config_get("global", "debug log", LOG_DIR "/debug.log");
 318                 if(strcmp(output_log_file, "syslog") == 0) {
 319                         output_log_syslog = 1;
 320                         output_log_file = NULL;
 321                 }
 322                 else if(strcmp(output_log_file, "none") == 0) {
 323                         output_log_syslog = 0;
 324                         output_log_file = NULL;
 325                 }
 326                 else output_log_syslog = 0;
 327
 328                 // --------------------------------------------------------------------
 329
 330                 error_log_file = config_get("global", "error log", LOG_DIR "/error.log");
 331                 if(strcmp(error_log_file, "syslog") == 0) {
 332                         error_log_syslog = 1;
 333                         error_log_file = NULL;
 334                 }
 335                 else if(strcmp(error_log_file, "none") == 0) {
 336                         error_log_syslog = 0;
 337                         error_log_file = NULL;
 338                         // optimization - do not even generate debug log entries
 339                 }
 340                 else error_log_syslog = 0;
 341
 342                 error_log_throttle_period = config_get_number("global", "errors flood protection period", error_log_throttle_period);
 343                 setenv("NETDATA_ERRORS_THROTTLE_PERIOD", config_get("global", "errors flood protection period"    , ""), 1);
 344
 345                 error_log_errors_per_period = config_get_number("global", "errors to trigger flood protection", error_log_errors_per_period);
 346                 setenv("NETDATA_ERRORS_PER_PERIOD"     , config_get("global", "errors to trigger flood protection", ""), 1);
 347
 348                 // --------------------------------------------------------------------
 349
 350                 access_log_file = config_get("global", "access log", LOG_DIR "/access.log");
 351                 if(strcmp(access_log_file, "syslog") == 0) {
 352                         access_log_syslog = 1;
 353                         access_log_file = NULL;
 354                 }
 355                 else if(strcmp(access_log_file, "none") == 0) {
 356                         access_log_syslog = 0;
 357                         access_log_file = NULL;
 358                 }
 359                 else access_log_syslog = 0;
 360
 361                 // --------------------------------------------------------------------
 362
 363                 rrd_memory_mode = rrd_memory_mode_id(config_get("global", "memory mode", rrd_memory_mode_name(rrd_memory_mode)));
 364
 365                 // --------------------------------------------------------------------
 366
 367                 if(gethostname(buffer, HOSTNAME_MAX) == -1)
 368                         error("WARNING: Cannot get machine hostname.");
 369                 hostname = config_get("global", "hostname", buffer);
 370                 debug(D_OPTIONS, "hostname set to '%s'", hostname);
 371
 372                 // --------------------------------------------------------------------
 373
 374                 rrd_default_history_entries = (int) config_get_number("global", "history", RRD_DEFAULT_HISTORY_ENTRIES);
 375                 if(rrd_default_history_entries < 5 || rrd_default_history_entries > RRD_HISTORY_ENTRIES_MAX) {
 376                         info("Invalid save lines %d given. Defaulting to %d.", rrd_default_history_entries, RRD_DEFAULT_HISTORY_ENTRIES);
 377                         rrd_default_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
 378                 }
 379                 else {
 380                         debug(D_OPTIONS, "save lines set to %d.", rrd_default_history_entries);
 381                 }
 382
 383                 // --------------------------------------------------------------------
 384
 385                 rrd_update_every = (int) config_get_number("global", "update every", UPDATE_EVERY);
 386                 if(rrd_update_every < 1 || rrd_update_every > 600) {
 387                         info("Invalid update timer %d given. Defaulting to %d.", rrd_update_every, UPDATE_EVERY_MAX);
 388                         rrd_update_every = UPDATE_EVERY;
 389                 }
 390                 else debug(D_OPTIONS, "update timer set to %d.", rrd_update_every);
 391
 392                 // let the plugins know the min update_every
 393                 {
 394                         char buf[50];
 395                         snprintf(buf, 50, "%d", rrd_update_every);
 396                         setenv("NETDATA_UPDATE_EVERY", buf, 1);
 397                 }
 398
 399                 // --------------------------------------------------------------------
 400
 401                 // block signals while initializing threads.
 402                 // this causes the threads to block signals.
 403                 sigset_t sigset;
 404                 sigfillset(&sigset);
 405
 406                 if(pthread_sigmask(SIG_BLOCK, &sigset, NULL) == -1) {
 407                         error("Could not block signals for threads");
 408                 }
 409
 410                 // Catch signals which we want to use to quit savely
 411                 struct sigaction sa;
 412                 sigemptyset(&sa.sa_mask);
 413                 sigaddset(&sa.sa_mask, SIGHUP);
 414                 sigaddset(&sa.sa_mask, SIGINT);
 415                 sigaddset(&sa.sa_mask, SIGTERM);
 416                 sa.sa_handler = sig_handler;
 417                 sa.sa_flags = 0;
 418                 if(sigaction(SIGHUP, &sa, NULL) == -1) {
 419                         error("Failed to change signal handler for SIGHUP");
 420                 }
 421                 if(sigaction(SIGINT, &sa, NULL) == -1) {
 422                         error("Failed to change signal handler for SIGINT");
 423                 }
 424                 if(sigaction(SIGTERM, &sa, NULL) == -1) {
 425                         error("Failed to change signal handler for SIGTERM");
 426                 }
 427                 // Ignore SIGPIPE completely.
 428                 // INFO: If we add signals here we have to unblock them
 429                 // at popen.c when running a external plugin.
 430                 sa.sa_handler = SIG_IGN;
 431                 if(sigaction(SIGPIPE, &sa, NULL) == -1) {
 432                         error("Failed to change signal handler for SIGTERM");
 433                 }
 434
 435                 // --------------------------------------------------------------------
 436
 437                 i = pthread_attr_init(&attr);
 438                 if(i != 0)
 439                         fatal("pthread_attr_init() failed with code %d.", i);
 440
 441                 i = pthread_attr_getstacksize(&attr, &stacksize);
 442                 if(i != 0)
 443                         fatal("pthread_attr_getstacksize() failed with code %d.", i);
 444                 else
 445                         debug(D_OPTIONS, "initial pthread stack size is %zu bytes", stacksize);
 446
 447                 wanted_stacksize = config_get_number("global", "pthread stack size", stacksize);
 448
 449                 // --------------------------------------------------------------------
 450
 451                 for (i = 0; static_threads[i].name != NULL ; i++) {
 452                         struct netdata_static_thread *st = &static_threads[i];
 453
 454                         if(st->config_name) st->enabled = config_get_boolean(st->config_section, st->config_name, st->enabled);
 455                         if(st->enabled && st->init_routine) st->init_routine();
 456                 }
 457
 458                 // --------------------------------------------------------------------
 459
 460                 // get the user we should run
 461                 // IMPORTANT: this is required before web_files_uid()
 462                 user = config_get("global", "run as user"    , (getuid() == 0)?NETDATA_USER:"");
 463
 464                 // IMPORTANT: these have to run once, while single threaded
 465                 web_files_uid(); // IMPORTANT: web_files_uid() before web_files_gid()
 466                 web_files_gid();
 467
 468                 // --------------------------------------------------------------------
 469
 470                 listen_backlog = (int) config_get_number("global", "http port listen backlog", LISTEN_BACKLOG);
 471
 472                 listen_port = (int) config_get_number("global", "port", LISTEN_PORT);
 473                 if(listen_port < 1 || listen_port > 65535) {
 474                         info("Invalid listen port %d given. Defaulting to %d.", listen_port, LISTEN_PORT);
 475                         listen_port = LISTEN_PORT;
 476                 }
 477                 else debug(D_OPTIONS, "Listen port set to %d.", listen_port);
 478
 479                 int ip = 0;
 480                 char *ipv = config_get("global", "ip version", "any");
 481                 if(!strcmp(ipv, "any") || !strcmp(ipv, "both") || !strcmp(ipv, "all")) ip = 0;
 482                 else if(!strcmp(ipv, "ipv4") || !strcmp(ipv, "IPV4") || !strcmp(ipv, "IPv4") || !strcmp(ipv, "4")) ip = 4;
 483                 else if(!strcmp(ipv, "ipv6") || !strcmp(ipv, "IPV6") || !strcmp(ipv, "IPv6") || !strcmp(ipv, "6")) ip = 6;
 484                 else info("Cannot understand ip version '%s'. Assuming 'any'.", ipv);
 485
 486                 if(ip == 0 || ip == 6) listen_fd = create_listen_socket6(config_get("global", "bind socket to IP", "*"), listen_port, listen_backlog);
 487                 if(listen_fd < 0) {
 488                         listen_fd = create_listen_socket4(config_get("global", "bind socket to IP", "*"), listen_port, listen_backlog);
 489                         if(listen_fd >= 0 && ip != 4) info("Managed to open an IPv4 socket on port %d.", listen_port);
 490                 }
 491
 492                 if(listen_fd < 0) fatal("Cannot listen socket.");
 493         }
 494
 495         // never become a problem
 496         if(nice(20) == -1) error("Cannot lower my CPU priority.");
 497
 498         if(become_daemon(dont_fork, 0, user, input_log_file, output_log_file, error_log_file, access_log_file, &access_fd, &stdaccess) == -1) {
 499                 fatal("Cannot demonize myself.");
 500                 exit(1);
 501         }
 502
 503         if(debug_flags != 0) {
 504                 struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
 505                 if(setrlimit(RLIMIT_CORE, &rl) != 0)
 506                         info("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
 507
 508                 prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
 509         }
 510
 511         if(output_log_syslog || error_log_syslog || access_log_syslog)
 512                 openlog("netdata", LOG_PID, LOG_DAEMON);
 513
 514         info("NetData started on pid %d", getpid());
 515
 516
 517
 518         // ------------------------------------------------------------------------
 519         // get default pthread stack size
 520
 521         if(stacksize < wanted_stacksize) {
 522                 i = pthread_attr_setstacksize(&attr, wanted_stacksize);
 523                 if(i != 0)
 524                         fatal("pthread_attr_setstacksize() to %zu bytes, failed with code %d.", wanted_stacksize, i);
 525                 else
 526                         info("Successfully set pthread stacksize to %zu bytes", wanted_stacksize);
 527         }
 528
 529         // ------------------------------------------------------------------------
 530         // spawn the threads
 531
 532         for (i = 0; static_threads[i].name != NULL ; i++) {
 533                 struct netdata_static_thread *st = &static_threads[i];
 534
 535                 if(st->enabled) {
 536                         st->thread = malloc(sizeof(pthread_t));
 537                         if(!st->thread)
 538                                 fatal("Cannot allocate pthread_t memory");
 539
 540                         info("Starting thread %s.", st->name);
 541
 542                         if(pthread_create(st->thread, &attr, st->start_routine, NULL))
 543                                 error("failed to create new thread for %s.", st->name);
 544
 545                         else if(pthread_detach(*st->thread))
 546                                 error("Cannot request detach of newly created %s thread.", st->name);
 547                 }
 548                 else info("Not starting thread %s.", st->name);
 549         }
 550
 551         // ------------------------------------------------------------------------
 552         // block signals while initializing threads.
 553         sigset_t sigset;
 554         sigfillset(&sigset);
 555
 556         if(pthread_sigmask(SIG_UNBLOCK, &sigset, NULL) == -1) {
 557                 error("Could not unblock signals for threads");
 558         }
 559
 560         // Handle flags set in the signal handler.
 561         while(1) {
 562                 pause();
 563                 if(netdata_exit) {
 564                         info("Exit main loop of netdata.");
 565                         netdata_cleanup_and_exit(0);
 566                         exit(0);
 567                 }
 568         }
 569 }