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