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 volatile sig_atomic_t 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                 ret = kill(pid, sig);
 127                 if(ret == -1) {
 128                         switch(errno) {
 129                                 case ESRCH:
 130                                         error("Cannot kill pid %d, but it is not running.", pid);
 131                                         break;
 132
 133                                 case EPERM:
 134                                         error("Cannot kill pid %d, but I do not have enough permissions.", pid);
 135                                         break;
 136
 137                                 default:
 138                                         error("Cannot kill pid %d, but I received an error.", pid);
 139                                         break;
 140                         }
 141                 }
 142         }
 143
 144         return ret;
 145 }
 146
 147 void kill_childs()
 148 {
 149         siginfo_t info;
 150
 151         struct web_client *w;
 152         for(w = web_clients; w ; w = w->next) {
 153                 debug(D_EXIT, "Stopping web client %s", w->client_ip);
 154                 pthread_cancel(w->thread);
 155                 pthread_join(w->thread, NULL);
 156         }
 157
 158         int i;
 159         for (i = 0; static_threads[i].name != NULL ; i++) {
 160                 if(static_threads[i].thread) {
 161                         debug(D_EXIT, "Stopping %s thread", static_threads[i].name);
 162                         pthread_cancel(*static_threads[i].thread);
 163                         pthread_join(*static_threads[i].thread, NULL);
 164                         static_threads[i].thread = NULL;
 165                 }
 166         }
 167
 168         if(tc_child_pid) {
 169                 info("Killing tc-qos-helper procees");
 170                 if(killpid(tc_child_pid, SIGTERM) != -1)
 171                         waitid(P_PID, (id_t) tc_child_pid, &info, WEXITED);
 172         }
 173         tc_child_pid = 0;
 174
 175         struct plugind *cd;
 176         for(cd = pluginsd_root ; cd ; cd = cd->next) {
 177                 debug(D_EXIT, "Stopping %s plugin thread", cd->id);
 178                 pthread_cancel(cd->thread);
 179                 pthread_join(cd->thread, NULL);
 180
 181                 if(cd->pid && !cd->obsolete) {
 182                         debug(D_EXIT, "killing %s plugin process", cd->id);
 183                         if(killpid(cd->pid, SIGTERM) != -1)
 184                                 waitid(P_PID, (id_t) cd->pid, &info, WEXITED);
 185                 }
 186         }
 187
 188         // if, for any reason there is any child exited
 189         // catch it here
 190         waitid(P_PID, 0, &info, WEXITED|WNOHANG);
 191
 192         debug(D_EXIT, "All threads/childs stopped.");
 193 }
 194
 195
 196 int main(int argc, char **argv)
 197 {
 198         int i;
 199         int config_loaded = 0;
 200         int dont_fork = 0;
 201         size_t wanted_stacksize = 0, stacksize = 0;
 202         pthread_attr_t attr;
 203
 204         // global initialization
 205         get_HZ();
 206
 207         // set the name for logging
 208         program_name = "netdata";
 209
 210         // parse  the arguments
 211         for(i = 1; i < argc ; i++) {
 212                 if(strcmp(argv[i], "-c") == 0 && (i+1) < argc) {
 213                         if(load_config(argv[i+1], 1) != 1) {
 214                                 error("Cannot load configuration file %s.", argv[i+1]);
 215                                 exit(1);
 216                         }
 217                         else {
 218                                 debug(D_OPTIONS, "Configuration loaded from %s.", argv[i+1]);
 219                                 config_loaded = 1;
 220                         }
 221                         i++;
 222                 }
 223                 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++; }
 224                 else if(strcmp(argv[i], "-p")  == 0 && (i+1) < argc) { config_set("global", "port",         argv[i+1]); i++; }
 225                 else if(strcmp(argv[i], "-u")  == 0 && (i+1) < argc) { config_set("global", "run as user",  argv[i+1]); i++; }
 226                 else if(strcmp(argv[i], "-l")  == 0 && (i+1) < argc) { config_set("global", "history",      argv[i+1]); i++; }
 227                 else if(strcmp(argv[i], "-t")  == 0 && (i+1) < argc) { config_set("global", "update every", argv[i+1]); i++; }
 228                 else if(strcmp(argv[i], "-ch") == 0 && (i+1) < argc) { config_set("global", "host access prefix", argv[i+1]); i++; }
 229                 else if(strcmp(argv[i], "-stacksize") == 0 && (i+1) < argc) { config_set("global", "pthread stack size", argv[i+1]); i++; }
 230                 else if(strcmp(argv[i], "-nodaemon") == 0 || strcmp(argv[i], "-nd") == 0) dont_fork = 1;
 231                 else if(strcmp(argv[i], "-pidfile") == 0 && (i+1) < argc) {
 232                         i++;
 233                         strncpy(pidfile, argv[i], FILENAME_MAX);
 234                         pidfile[FILENAME_MAX] = '\0';
 235                 }
 236                 else if(strcmp(argv[i], "--unittest")  == 0) {
 237                         rrd_update_every = 1;
 238                         if(run_all_mockup_tests()) exit(1);
 239                         if(unit_test_storage()) exit(1);
 240                         fprintf(stderr, "\n\nALL TESTS PASSED\n\n");
 241                         exit(0);
 242                 }
 243                 else {
 244                         fprintf(stderr, "Cannot understand option '%s'.\n", argv[i]);
 245                         fprintf(stderr, "\nUSAGE: %s [-d] [-l LINES_TO_SAVE] [-u UPDATE_TIMER] [-p LISTEN_PORT] [-df debug flags].\n\n", argv[0]);
 246                         fprintf(stderr, "  -c CONFIG FILE the configuration file to load. Default: %s.\n", CONFIG_DIR "/" CONFIG_FILENAME);
 247                         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);
 248                         fprintf(stderr, "  -t UPDATE_TIMER can be from 1 to %d seconds. Default: %d.\n", UPDATE_EVERY_MAX, UPDATE_EVERY);
 249                         fprintf(stderr, "  -p LISTEN_PORT can be from 1 to %d. Default: %d.\n", 65535, LISTEN_PORT);
 250                         fprintf(stderr, "  -u USERNAME can be any system username to run as. Default: none.\n");
 251                         fprintf(stderr, "  -ch path to access host /proc and /sys when running in a container. Default: empty.\n");
 252                         fprintf(stderr, "  -nd or -nodeamon to disable forking in the background. Default: unset.\n");
 253                         fprintf(stderr, "  -df FLAGS debug options. Default: 0x%08llx.\n", debug_flags);
 254                         fprintf(stderr, "  -stacksize BYTES to overwrite the pthread stack size.\n");
 255                         fprintf(stderr, "  -pidfile FILENAME to save a pid while running.\n");
 256                         exit(1);
 257                 }
 258         }
 259
 260         if(!config_loaded) load_config(NULL, 0);
 261
 262         // prepare configuration environment variables for the plugins
 263         setenv("NETDATA_CONFIG_DIR" , config_get("global", "config directory"   , CONFIG_DIR) , 1);
 264         setenv("NETDATA_PLUGINS_DIR", config_get("global", "plugins directory"  , PLUGINS_DIR), 1);
 265         setenv("NETDATA_WEB_DIR"    , config_get("global", "web files directory", WEB_DIR)    , 1);
 266         setenv("NETDATA_CACHE_DIR"  , config_get("global", "cache directory"    , CACHE_DIR)  , 1);
 267         setenv("NETDATA_LIB_DIR"    , config_get("global", "lib directory"      , VARLIB_DIR) , 1);
 268         setenv("NETDATA_LOG_DIR"    , config_get("global", "log directory"      , LOG_DIR)    , 1);
 269         setenv("NETDATA_HOST_PREFIX", config_get("global", "host access prefix" , "")         , 1);
 270         setenv("HOME"               , config_get("global", "home directory"     , CACHE_DIR)  , 1);
 271
 272         // avoid extended to stat(/etc/localtime)
 273         // http://stackoverflow.com/questions/4554271/how-to-avoid-excessive-stat-etc-localtime-calls-in-strftime-on-linux
 274         setenv("TZ", ":/etc/localtime", 0);
 275
 276         // cd to /tmp to avoid any plugins writing files at random places
 277         if(chdir("/tmp")) error("netdata: ERROR: Cannot cd to /tmp");
 278
 279         char *input_log_file = NULL;
 280         char *output_log_file = NULL;
 281         char *error_log_file = NULL;
 282         char *access_log_file = NULL;
 283         char *user = NULL;
 284         {
 285                 char buffer[1024];
 286
 287                 // --------------------------------------------------------------------
 288
 289                 sprintf(buffer, "0x%08llx", 0ULL);
 290                 char *flags = config_get("global", "debug flags", buffer);
 291                 setenv("NETDATA_DEBUG_FLAGS", flags, 1);
 292
 293                 debug_flags = strtoull(flags, NULL, 0);
 294                 debug(D_OPTIONS, "Debug flags set to '0x%8llx'.", debug_flags);
 295
 296                 if(debug_flags != 0) {
 297                         struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
 298                         if(setrlimit(RLIMIT_CORE, &rl) != 0)
 299                                 info("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
 300                         prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
 301                 }
 302
 303                 // --------------------------------------------------------------------
 304
 305 #ifdef MADV_MERGEABLE
 306                 enable_ksm = config_get_boolean("global", "memory deduplication (ksm)", enable_ksm);
 307 #else
 308 #warning "Kernel memory deduplication (KSM) is not available"
 309 #endif
 310
 311                 // --------------------------------------------------------------------
 312
 313
 314                 global_host_prefix = config_get("global", "host access prefix", "");
 315                 setenv("NETDATA_HOST_PREFIX", global_host_prefix, 1);
 316
 317                 // --------------------------------------------------------------------
 318
 319                 output_log_file = config_get("global", "debug log", LOG_DIR "/debug.log");
 320                 if(strcmp(output_log_file, "syslog") == 0) {
 321                         output_log_syslog = 1;
 322                         output_log_file = NULL;
 323                 }
 324                 else if(strcmp(output_log_file, "none") == 0) {
 325                         output_log_syslog = 0;
 326                         output_log_file = NULL;
 327                 }
 328                 else output_log_syslog = 0;
 329
 330                 // --------------------------------------------------------------------
 331
 332                 error_log_file = config_get("global", "error log", LOG_DIR "/error.log");
 333                 if(strcmp(error_log_file, "syslog") == 0) {
 334                         error_log_syslog = 1;
 335                         error_log_file = NULL;
 336                 }
 337                 else if(strcmp(error_log_file, "none") == 0) {
 338                         error_log_syslog = 0;
 339                         error_log_file = NULL;
 340                         // optimization - do not even generate debug log entries
 341                 }
 342                 else error_log_syslog = 0;
 343
 344                 error_log_throttle_period = config_get_number("global", "errors flood protection period", error_log_throttle_period);
 345                 setenv("NETDATA_ERRORS_THROTTLE_PERIOD", config_get("global", "errors flood protection period"    , ""), 1);
 346
 347                 error_log_errors_per_period = config_get_number("global", "errors to trigger flood protection", error_log_errors_per_period);
 348                 setenv("NETDATA_ERRORS_PER_PERIOD"     , config_get("global", "errors to trigger flood protection", ""), 1);
 349
 350                 // --------------------------------------------------------------------
 351
 352                 access_log_file = config_get("global", "access log", LOG_DIR "/access.log");
 353                 if(strcmp(access_log_file, "syslog") == 0) {
 354                         access_log_syslog = 1;
 355                         access_log_file = NULL;
 356                 }
 357                 else if(strcmp(access_log_file, "none") == 0) {
 358                         access_log_syslog = 0;
 359                         access_log_file = NULL;
 360                 }
 361                 else access_log_syslog = 0;
 362
 363                 // --------------------------------------------------------------------
 364
 365                 rrd_memory_mode = rrd_memory_mode_id(config_get("global", "memory mode", rrd_memory_mode_name(rrd_memory_mode)));
 366
 367                 // --------------------------------------------------------------------
 368
 369                 if(gethostname(buffer, HOSTNAME_MAX) == -1)
 370                         error("WARNING: Cannot get machine hostname.");
 371                 hostname = config_get("global", "hostname", buffer);
 372                 debug(D_OPTIONS, "hostname set to '%s'", hostname);
 373
 374                 // --------------------------------------------------------------------
 375
 376                 rrd_default_history_entries = (int) config_get_number("global", "history", RRD_DEFAULT_HISTORY_ENTRIES);
 377                 if(rrd_default_history_entries < 5 || rrd_default_history_entries > RRD_HISTORY_ENTRIES_MAX) {
 378                         info("Invalid save lines %d given. Defaulting to %d.", rrd_default_history_entries, RRD_DEFAULT_HISTORY_ENTRIES);
 379                         rrd_default_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
 380                 }
 381                 else {
 382                         debug(D_OPTIONS, "save lines set to %d.", rrd_default_history_entries);
 383                 }
 384
 385                 // --------------------------------------------------------------------
 386
 387                 rrd_update_every = (int) config_get_number("global", "update every", UPDATE_EVERY);
 388                 if(rrd_update_every < 1 || rrd_update_every > 600) {
 389                         info("Invalid update timer %d given. Defaulting to %d.", rrd_update_every, UPDATE_EVERY_MAX);
 390                         rrd_update_every = UPDATE_EVERY;
 391                 }
 392                 else debug(D_OPTIONS, "update timer set to %d.", rrd_update_every);
 393
 394                 // let the plugins know the min update_every
 395                 {
 396                         char buf[50];
 397                         snprintf(buf, 50, "%d", rrd_update_every);
 398                         setenv("NETDATA_UPDATE_EVERY", buf, 1);
 399                 }
 400
 401                 // --------------------------------------------------------------------
 402
 403                 // block signals while initializing threads.
 404                 // this causes the threads to block signals.
 405                 sigset_t sigset;
 406                 sigfillset(&sigset);
 407
 408                 if(pthread_sigmask(SIG_BLOCK, &sigset, NULL) == -1) {
 409                         error("Could not block signals for threads");
 410                 }
 411
 412                 // Catch signals which we want to use to quit savely
 413                 struct sigaction sa;
 414                 sigemptyset(&sa.sa_mask);
 415                 sigaddset(&sa.sa_mask, SIGHUP);
 416                 sigaddset(&sa.sa_mask, SIGINT);
 417                 sigaddset(&sa.sa_mask, SIGTERM);
 418                 sa.sa_handler = sig_handler;
 419                 if(sigaction(SIGHUP, &sa, NULL) == -1) {
 420                         error("Failed to change signal handler for SIGHUP");
 421                 }
 422                 if(sigaction(SIGINT, &sa, NULL) == -1) {
 423                         error("Failed to change signal handler for SIGINT");
 424                 }
 425                 if(sigaction(SIGTERM, &sa, NULL) == -1) {
 426                         error("Failed to change signal handler for SIGTERM");
 427                 }
 428                 // Ignore SIGPIPE completely.
 429                 // INFO: If we add signals here we have to unblock them
 430                 // at popen.c when running a external plugin.
 431                 sa.sa_handler = SIG_IGN;
 432                 if(sigaction(SIGPIPE, &sa, NULL) == -1) {
 433                         error("Failed to change signal handler for SIGTERM");
 434                 }
 435
 436                 // --------------------------------------------------------------------
 437
 438                 i = pthread_attr_init(&attr);
 439                 if(i != 0)
 440                         fatal("pthread_attr_init() failed with code %d.", i);
 441
 442                 i = pthread_attr_getstacksize(&attr, &stacksize);
 443                 if(i != 0)
 444                         fatal("pthread_attr_getstacksize() failed with code %d.", i);
 445                 else
 446                         debug(D_OPTIONS, "initial pthread stack size is %zu bytes", stacksize);
 447
 448                 wanted_stacksize = config_get_number("global", "pthread stack size", stacksize);
 449
 450                 // --------------------------------------------------------------------
 451
 452                 for (i = 0; static_threads[i].name != NULL ; i++) {
 453                         struct netdata_static_thread *st = &static_threads[i];
 454
 455                         if(st->config_name) st->enabled = config_get_boolean(st->config_section, st->config_name, st->enabled);
 456                         if(st->enabled && st->init_routine) st->init_routine();
 457                 }
 458
 459                 // --------------------------------------------------------------------
 460
 461                 // get the user we should run
 462                 // IMPORTANT: this is required before web_files_uid()
 463                 user = config_get("global", "run as user"    , (getuid() == 0)?NETDATA_USER:"");
 464
 465                 // IMPORTANT: these have to run once, while single threaded
 466                 web_files_uid(); // IMPORTANT: web_files_uid() before web_files_gid()
 467                 web_files_gid();
 468
 469                 // --------------------------------------------------------------------
 470
 471                 listen_backlog = (int) config_get_number("global", "http port listen backlog", LISTEN_BACKLOG);
 472
 473                 listen_port = (int) config_get_number("global", "port", LISTEN_PORT);
 474                 if(listen_port < 1 || listen_port > 65535) {
 475                         info("Invalid listen port %d given. Defaulting to %d.", listen_port, LISTEN_PORT);
 476                         listen_port = LISTEN_PORT;
 477                 }
 478                 else debug(D_OPTIONS, "Listen port set to %d.", listen_port);
 479
 480                 int ip = 0;
 481                 char *ipv = config_get("global", "ip version", "any");
 482                 if(!strcmp(ipv, "any") || !strcmp(ipv, "both") || !strcmp(ipv, "all")) ip = 0;
 483                 else if(!strcmp(ipv, "ipv4") || !strcmp(ipv, "IPV4") || !strcmp(ipv, "IPv4") || !strcmp(ipv, "4")) ip = 4;
 484                 else if(!strcmp(ipv, "ipv6") || !strcmp(ipv, "IPV6") || !strcmp(ipv, "IPv6") || !strcmp(ipv, "6")) ip = 6;
 485                 else info("Cannot understand ip version '%s'. Assuming 'any'.", ipv);
 486
 487                 if(ip == 0 || ip == 6) listen_fd = create_listen_socket6(config_get("global", "bind socket to IP", "*"), listen_port, listen_backlog);
 488                 if(listen_fd < 0) {
 489                         listen_fd = create_listen_socket4(config_get("global", "bind socket to IP", "*"), listen_port, listen_backlog);
 490                         if(listen_fd >= 0 && ip != 4) info("Managed to open an IPv4 socket on port %d.", listen_port);
 491                 }
 492
 493                 if(listen_fd < 0) fatal("Cannot listen socket.");
 494         }
 495
 496         // never become a problem
 497         if(nice(20) == -1) error("Cannot lower my CPU priority.");
 498
 499         if(become_daemon(dont_fork, 0, user, input_log_file, output_log_file, error_log_file, access_log_file, &access_fd, &stdaccess) == -1) {
 500                 fatal("Cannot demonize myself.");
 501                 exit(1);
 502         }
 503
 504         if(debug_flags != 0) {
 505                 struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
 506                 if(setrlimit(RLIMIT_CORE, &rl) != 0)
 507                         info("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
 508
 509                 prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
 510         }
 511
 512         if(output_log_syslog || error_log_syslog || access_log_syslog)
 513                 openlog("netdata", LOG_PID, LOG_DAEMON);
 514
 515         info("NetData started on pid %d", getpid());
 516
 517
 518
 519         // ------------------------------------------------------------------------
 520         // get default pthread stack size
 521
 522         if(stacksize < wanted_stacksize) {
 523                 i = pthread_attr_setstacksize(&attr, wanted_stacksize);
 524                 if(i != 0)
 525                         fatal("pthread_attr_setstacksize() to %zu bytes, failed with code %d.", wanted_stacksize, i);
 526                 else
 527                         info("Successfully set pthread stacksize to %zu bytes", wanted_stacksize);
 528         }
 529
 530         // --------------------------------------------------------------------
 531         // initialize the registry
 532
 533         registry_init();
 534
 535
 536         // ------------------------------------------------------------------------
 537         // spawn the threads
 538
 539         for (i = 0; static_threads[i].name != NULL ; i++) {
 540                 struct netdata_static_thread *st = &static_threads[i];
 541
 542                 if(st->enabled) {
 543                         st->thread = malloc(sizeof(pthread_t));
 544                         if(!st->thread)
 545                                 fatal("Cannot allocate pthread_t memory");
 546
 547                         info("Starting thread %s.", st->name);
 548
 549                         if(pthread_create(st->thread, &attr, st->start_routine, NULL))
 550                                 error("failed to create new thread for %s.", st->name);
 551
 552                         else if(pthread_detach(*st->thread))
 553                                 error("Cannot request detach of newly created %s thread.", st->name);
 554                 }
 555                 else info("Not starting thread %s.", st->name);
 556         }
 557
 558         // ------------------------------------------------------------------------
 559         // block signals while initializing threads.
 560         sigset_t sigset;
 561         sigfillset(&sigset);
 562
 563         if(pthread_sigmask(SIG_UNBLOCK, &sigset, NULL) == -1) {
 564                 error("Could not unblock signals for threads");
 565         }
 566
 567         // Handle flags set in the signal handler.
 568         while(1) {
 569                 pause();
 570                 if(netdata_exit) {
 571                         info("Exit main loop of netdata.");
 572                         netdata_cleanup_and_exit(0);
 573                         exit(0);
 574                 }
 575         }
 576 }