src/main.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4 #include <errno.h>
   5 #include <getopt.h>
   6 #include <pthread.h>
   7 #include <signal.h>
   8 #include <stdio.h>
   9 #include <stdlib.h>
  10 #include <string.h>
  11 #include <sys/mman.h>
  12 #include <sys/prctl.h>
  13 #include <sys/wait.h>
  14 #include <syslog.h>
  15 #include <unistd.h>
  16
  17 #include "appconfig.h"
  18 #include "common.h"
  19 #include "daemon.h"
  20 #include "log.h"
  21 #include "popen.h"
  22 #include "rrd.h"
  23 #include "rrd2json.h"
  24 #include "web_client.h"
  25 #include "web_server.h"
  26
  27 #include "unit_test.h"
  28
  29 #include "plugin_checks.h"
  30 #include "plugin_idlejitter.h"
  31 #include "plugin_nfacct.h"
  32 #include "registry.h"
  33 #include "plugin_proc.h"
  34 #include "plugin_tc.h"
  35 #include "plugins_d.h"
  36
  37 #include "main.h"
  38
  39 extern void *cgroups_main(void *ptr);
  40
  41 volatile sig_atomic_t netdata_exit = 0;
  42
  43 void netdata_cleanup_and_exit(int ret)
  44 {
  45         netdata_exit = 1;
  46         rrdset_save_all();
  47         // kill_childs();
  48
  49         // let it log a few more error messages
  50         error_log_limit_reset();
  51
  52         if(pidfile[0]) {
  53                 if(unlink(pidfile) != 0)
  54                         error("Cannot unlink pidfile '%s'.", pidfile);
  55         }
  56
  57         info("NetData exiting. Bye bye...");
  58         exit(ret);
  59 }
  60
  61 struct netdata_static_thread {
  62         char *name;
  63
  64         char *config_section;
  65         char *config_name;
  66
  67         int enabled;
  68
  69         pthread_t *thread;
  70
  71         void (*init_routine) (void);
  72         void *(*start_routine) (void *);
  73 };
  74
  75 struct netdata_static_thread static_threads[] = {
  76         {"tc",                  "plugins",      "tc",                   1, NULL, NULL,  tc_main},
  77         {"idlejitter",  "plugins",      "idlejitter",   1, NULL, NULL,  cpuidlejitter_main},
  78         {"proc",                "plugins",      "proc",                 1, NULL, NULL,  proc_main},
  79         {"cgroups",             "plugins",      "cgroups",              1, NULL, NULL,  cgroups_main},
  80
  81 #ifdef INTERNAL_PLUGIN_NFACCT
  82         // nfacct requires root access
  83         // so, we build it as an external plugin with setuid to root
  84         {"nfacct",              "plugins",      "nfacct",               1, NULL, NULL,  nfacct_main},
  85 #endif
  86
  87         {"plugins.d",   NULL,           NULL,                   1, NULL, NULL,  pluginsd_main},
  88         {"check",               "plugins",      "checks",               0, NULL, NULL,  checks_main},
  89         {"web",                 NULL,           NULL,                   1, NULL, NULL,  socket_listen_main},
  90         {NULL,                  NULL,           NULL,                   0, NULL, NULL,  NULL}
  91 };
  92
  93 int killpid(pid_t pid, int sig)
  94 {
  95         int ret = -1;
  96         debug(D_EXIT, "Request to kill pid %d", pid);
  97
  98         errno = 0;
  99         if(kill(pid, 0) == -1) {
 100                 switch(errno) {
 101                         case ESRCH:
 102                                 error("Request to kill pid %d, but it is not running.", pid);
 103                                 break;
 104
 105                         case EPERM:
 106                                 error("Request to kill pid %d, but I do not have enough permissions.", pid);
 107                                 break;
 108
 109                         default:
 110                                 error("Request to kill pid %d, but I received an error.", pid);
 111                                 break;
 112                 }
 113         }
 114         else {
 115                 errno = 0;
 116                 ret = kill(pid, sig);
 117                 if(ret == -1) {
 118                         switch(errno) {
 119                                 case ESRCH:
 120                                         error("Cannot kill pid %d, but it is not running.", pid);
 121                                         break;
 122
 123                                 case EPERM:
 124                                         error("Cannot kill pid %d, but I do not have enough permissions.", pid);
 125                                         break;
 126
 127                                 default:
 128                                         error("Cannot kill pid %d, but I received an error.", pid);
 129                                         break;
 130                         }
 131                 }
 132         }
 133
 134         return ret;
 135 }
 136
 137 void kill_childs()
 138 {
 139         siginfo_t info;
 140
 141         struct web_client *w;
 142         for(w = web_clients; w ; w = w->next) {
 143                 debug(D_EXIT, "Stopping web client %s", w->client_ip);
 144                 pthread_cancel(w->thread);
 145                 pthread_join(w->thread, NULL);
 146         }
 147
 148         int i;
 149         for (i = 0; static_threads[i].name != NULL ; i++) {
 150                 if(static_threads[i].thread) {
 151                         debug(D_EXIT, "Stopping %s thread", static_threads[i].name);
 152                         pthread_cancel(*static_threads[i].thread);
 153                         pthread_join(*static_threads[i].thread, NULL);
 154                         static_threads[i].thread = NULL;
 155                 }
 156         }
 157
 158         if(tc_child_pid) {
 159                 info("Killing tc-qos-helper procees");
 160                 if(killpid(tc_child_pid, SIGTERM) != -1)
 161                         waitid(P_PID, (id_t) tc_child_pid, &info, WEXITED);
 162         }
 163         tc_child_pid = 0;
 164
 165         struct plugind *cd;
 166         for(cd = pluginsd_root ; cd ; cd = cd->next) {
 167                 debug(D_EXIT, "Stopping %s plugin thread", cd->id);
 168                 pthread_cancel(cd->thread);
 169                 pthread_join(cd->thread, NULL);
 170
 171                 if(cd->pid && !cd->obsolete) {
 172                         debug(D_EXIT, "killing %s plugin process", cd->id);
 173                         if(killpid(cd->pid, SIGTERM) != -1)
 174                                 waitid(P_PID, (id_t) cd->pid, &info, WEXITED);
 175                 }
 176         }
 177
 178         // if, for any reason there is any child exited
 179         // catch it here
 180         waitid(P_PID, 0, &info, WEXITED|WNOHANG);
 181
 182         debug(D_EXIT, "All threads/childs stopped.");
 183 }
 184
 185 struct option_def options[] = {
 186         // opt description                                                       arg name                     default value
 187         {'c', "Load alternate configuration file",                               "config_file",                          CONFIG_DIR "/" CONFIG_FILENAME},
 188         {'D', "Disable fork into background",                                    NULL,                                   NULL},
 189         {'h', "Display help message",                                            NULL,                                   NULL},
 190         {'P', "File to save a pid while running",                                "FILE",                                 NULL},
 191         {'i', "The IP address to listen to.",                                    "address",                              "All addresses"},
 192         {'p', "Port to listen. Can be from 1 to 65535.",                         "port_number",                          "19999"},
 193         {'s', "Path to access host /proc and /sys when running in a container.", "PATH",                                 NULL},
 194         {'t', "The frequency in seconds, for data collection. \
 195 Same as 'update every' config file option.",                                 "seconds",                              "1"},
 196         {'u', "System username to run as.",                                      "username",                             "netdata"},
 197         {'v', "Version of the program",                                          NULL,                                   NULL},
 198         {'W', "vendor options.",                                                 "stacksize=<size>|unittest|debug_flag", NULL},
 199 };
 200
 201 void help(int exitcode) {
 202         FILE *stream;
 203         if(exitcode == 0)
 204                 stream = stdout;
 205         else
 206                 stream = stderr;
 207
 208         int num_opts = sizeof(options) / sizeof(struct option_def);
 209         int i;
 210         int max_len_arg = 0;
 211
 212         // Compute maximum argument length
 213         for( i = 0; i < num_opts; i++ ) {
 214                 if(options[i].arg_name) {
 215                         int len_arg = strlen(options[i].arg_name);
 216                         if(len_arg > max_len_arg) max_len_arg = len_arg;
 217                 }
 218         }
 219
 220         fprintf(stream, "SYNOPSIS: netdata [options]\n");
 221         fprintf(stream, "\n");
 222         fprintf(stream, "Options:\n");
 223
 224         // Output options description.
 225         for( i = 0; i < num_opts; i++ ) {
 226                 fprintf(stream, "  -%c %-*s  %s", options[i].val, max_len_arg, options[i].arg_name ? options[i].arg_name : "", options[i].description);
 227                 if(options[i].default_value) {
 228                         fprintf(stream, " Default: %s\n", options[i].default_value);
 229                 } else {
 230                         fprintf(stream, "\n");
 231                 }
 232         }
 233
 234         fflush(stream);
 235         exit(exitcode);
 236 }
 237
 238 // TODO: Remove this function with the nix major release.
 239 void remove_option(int opt_index, int *argc, char **argv) {
 240         int i = opt_index;
 241         // remove the options.
 242         do {
 243                 *argc = *argc - 1;
 244                 for(i = opt_index; i < *argc; i++) {
 245                         argv[i] = argv[i+1];
 246                 }
 247                 i = opt_index;
 248         } while(argv[i][0] != '-' && opt_index >= *argc);
 249 }
 250
 251
 252 int main(int argc, char **argv)
 253 {
 254         int i;
 255         int config_loaded = 0;
 256         int dont_fork = 0;
 257         size_t wanted_stacksize = 0, stacksize = 0;
 258         pthread_attr_t attr;
 259
 260         // global initialization
 261         get_HZ();
 262
 263         // set the name for logging
 264         program_name = "netdata";
 265
 266         // parse command line.
 267
 268         // parse depercated options
 269         // TODO: Remove this block with the next major release.
 270         {
 271                 i = 1;
 272                 while(i < argc) {
 273                         if(strcmp(argv[i], "-pidfile") == 0 && (i+1) < argc) {
 274                                 strncpyz(pidfile, argv[i+1], FILENAME_MAX);
 275                                 fprintf(stderr, "%s: deprecate option -- %s -- please use -P instead.\n", argv[0], argv[i]);
 276                                 remove_option(i, &argc, argv);
 277                         }
 278                         else if(strcmp(argv[i], "-nodaemon") == 0 || strcmp(argv[i], "-nd") == 0) {
 279                                 dont_fork = 1;
 280                                 fprintf(stderr, "%s: deprecate option -- %s -- please use -D instead.\n ", argv[0], argv[i]);
 281                                 remove_option(i, &argc, argv);
 282                         }
 283                         else if(strcmp(argv[i], "-ch") == 0 && (i+1) < argc) {
 284                                 config_set("global", "host access prefix", argv[i+1]);
 285                                 fprintf(stderr, "%s: deprecate option -- %s -- please use -s instead.\n", argv[0], argv[i]);
 286                                 remove_option(i, &argc, argv);
 287                         }
 288                         else if(strcmp(argv[i], "-l") == 0 && (i+1) < argc) {
 289                                 config_set("global", "history", argv[i+1]);
 290                                 fprintf(stderr, "%s: deprecate option -- %s -- This option will be rmoved with V2.*.\n", argv[0], argv[i]);
 291                                 remove_option(i, &argc, argv);
 292                         }
 293                         else i++;
 294                 }
 295         }
 296
 297         // parse options
 298         {
 299                 int num_opts = sizeof(options) / sizeof(struct option_def);
 300                 char optstring[(num_opts * 2) + 1];
 301
 302                 int string_i = 0;
 303                 for( i = 0; i < num_opts; i++ ) {
 304                         optstring[string_i] = options[i].val;
 305                         string_i++;
 306                         if(options[i].arg_name) {
 307                                 optstring[string_i] = ':';
 308                                 string_i++;
 309                         }
 310                 }
 311
 312                 int opt;
 313                 while( (opt = getopt(argc, argv, optstring)) != -1 ) {
 314                         switch(opt) {
 315                                 case 'c':
 316                                         if(load_config(optarg, 1) != 1) {
 317                                                 error("Cannot load configuration file %s.", optarg);
 318                                                 exit(1);
 319                                         }
 320                                         else {
 321                                                 debug(D_OPTIONS, "Configuration loaded from %s.", optarg);
 322                                                 config_loaded = 1;
 323                                         }
 324                                         break;
 325                                 case 'D':
 326                                         dont_fork = 1;
 327                                         break;
 328                                 case 'h':
 329                                         help(0);
 330                                         break;
 331                                 case 'i':
 332                                         config_set("global", "bind socket to IP", optarg);
 333                                         break;
 334                                 case 'P':
 335                                         strncpy(pidfile, optarg, FILENAME_MAX);
 336                                         pidfile[FILENAME_MAX] = '\0';
 337                                         break;
 338                                 case 'p':
 339                                         config_set("global", "port", optarg);
 340                                         break;
 341                                 case 's':
 342                                         config_set("global", "host access prefix", optarg);
 343                                         break;
 344                                 case 't':
 345                                         config_set("global", "update every", optarg);
 346                                         break;
 347                                 case 'u':
 348                                         config_set("global", "run as user", optarg);
 349                                         break;
 350                                 case 'v':
 351                                         // TODO: Outsource version to makefile which can compute version from git.
 352                                         printf("netdata 1.1.0\n");
 353                                         return 0;
 354                                         break;
 355                                 case 'W':
 356                                         {
 357                                                 char* stacksize = "stacksize=";
 358                                                 char* debug_flags_string = "debug_flags=";
 359                                                 if(strcmp(optarg, "unittest") == 0) {
 360                                                         rrd_update_every = 1;
 361                                                         if(run_all_mockup_tests()) exit(1);
 362                                                         if(unit_test_storage()) exit(1);
 363                                                         fprintf(stderr, "\n\nALL TESTS PASSED\n\n");
 364                                                         exit(0);
 365                                                 } else if(strncmp(optarg, stacksize, strlen(stacksize)) == 0) {
 366                                                         optarg += strlen(stacksize);
 367                                                         config_set("global", "pthread stack size", optarg);
 368                                                 } else if(strncmp(optarg, debug_flags_string, strlen(debug_flags_string)) == 0) {
 369                                                         optarg += strlen(debug_flags_string);
 370                                                         config_set("global", "debug flags",  optarg);
 371                                                         debug_flags = strtoull(optarg, NULL, 0);
 372                                                 }
 373                                         }
 374                                         break;
 375                                 default: /* ? */
 376                                         help(1);
 377                                         break;
 378                         }
 379                 }
 380         }
 381
 382         if(!config_loaded) load_config(NULL, 0);
 383
 384         // prepare configuration environment variables for the plugins
 385         setenv("NETDATA_CONFIG_DIR" , config_get("global", "config directory"   , CONFIG_DIR) , 1);
 386         setenv("NETDATA_PLUGINS_DIR", config_get("global", "plugins directory"  , PLUGINS_DIR), 1);
 387         setenv("NETDATA_WEB_DIR"    , config_get("global", "web files directory", WEB_DIR)    , 1);
 388         setenv("NETDATA_CACHE_DIR"  , config_get("global", "cache directory"    , CACHE_DIR)  , 1);
 389         setenv("NETDATA_LIB_DIR"    , config_get("global", "lib directory"      , VARLIB_DIR) , 1);
 390         setenv("NETDATA_LOG_DIR"    , config_get("global", "log directory"      , LOG_DIR)    , 1);
 391         setenv("NETDATA_HOST_PREFIX", config_get("global", "host access prefix" , "")         , 1);
 392         setenv("HOME"               , config_get("global", "home directory"     , CACHE_DIR)  , 1);
 393
 394         // avoid extended to stat(/etc/localtime)
 395         // http://stackoverflow.com/questions/4554271/how-to-avoid-excessive-stat-etc-localtime-calls-in-strftime-on-linux
 396         setenv("TZ", ":/etc/localtime", 0);
 397
 398         // cd to /tmp to avoid any plugins writing files at random places
 399         if(chdir("/tmp")) error("netdata: ERROR: Cannot cd to /tmp");
 400
 401         char *input_log_file = NULL;
 402         char *output_log_file = NULL;
 403         char *error_log_file = NULL;
 404         char *access_log_file = NULL;
 405         char *user = NULL;
 406         {
 407                 char buffer[1024];
 408
 409                 // --------------------------------------------------------------------
 410
 411                 sprintf(buffer, "0x%08llx", 0ULL);
 412                 char *flags = config_get("global", "debug flags", buffer);
 413                 setenv("NETDATA_DEBUG_FLAGS", flags, 1);
 414
 415                 debug_flags = strtoull(flags, NULL, 0);
 416                 debug(D_OPTIONS, "Debug flags set to '0x%8llx'.", debug_flags);
 417
 418                 if(debug_flags != 0) {
 419                         struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
 420                         if(setrlimit(RLIMIT_CORE, &rl) != 0)
 421                                 info("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
 422                         prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
 423                 }
 424
 425                 // --------------------------------------------------------------------
 426
 427 #ifdef MADV_MERGEABLE
 428                 enable_ksm = config_get_boolean("global", "memory deduplication (ksm)", enable_ksm);
 429 #else
 430 #warning "Kernel memory deduplication (KSM) is not available"
 431 #endif
 432
 433                 // --------------------------------------------------------------------
 434
 435
 436                 global_host_prefix = config_get("global", "host access prefix", "");
 437                 setenv("NETDATA_HOST_PREFIX", global_host_prefix, 1);
 438
 439                 // --------------------------------------------------------------------
 440
 441                 output_log_file = config_get("global", "debug log", LOG_DIR "/debug.log");
 442                 if(strcmp(output_log_file, "syslog") == 0) {
 443                         output_log_syslog = 1;
 444                         output_log_file = NULL;
 445                 }
 446                 else if(strcmp(output_log_file, "none") == 0) {
 447                         output_log_syslog = 0;
 448                         output_log_file = NULL;
 449                 }
 450                 else output_log_syslog = 0;
 451
 452                 // --------------------------------------------------------------------
 453
 454                 error_log_file = config_get("global", "error log", LOG_DIR "/error.log");
 455                 if(strcmp(error_log_file, "syslog") == 0) {
 456                         error_log_syslog = 1;
 457                         error_log_file = NULL;
 458                 }
 459                 else if(strcmp(error_log_file, "none") == 0) {
 460                         error_log_syslog = 0;
 461                         error_log_file = NULL;
 462                         // optimization - do not even generate debug log entries
 463                 }
 464                 else error_log_syslog = 0;
 465
 466                 error_log_throttle_period = config_get_number("global", "errors flood protection period", error_log_throttle_period);
 467                 setenv("NETDATA_ERRORS_THROTTLE_PERIOD", config_get("global", "errors flood protection period"    , ""), 1);
 468
 469                 error_log_errors_per_period = config_get_number("global", "errors to trigger flood protection", error_log_errors_per_period);
 470                 setenv("NETDATA_ERRORS_PER_PERIOD"     , config_get("global", "errors to trigger flood protection", ""), 1);
 471
 472                 // --------------------------------------------------------------------
 473
 474                 access_log_file = config_get("global", "access log", LOG_DIR "/access.log");
 475                 if(strcmp(access_log_file, "syslog") == 0) {
 476                         access_log_syslog = 1;
 477                         access_log_file = NULL;
 478                 }
 479                 else if(strcmp(access_log_file, "none") == 0) {
 480                         access_log_syslog = 0;
 481                         access_log_file = NULL;
 482                 }
 483                 else access_log_syslog = 0;
 484
 485                 // --------------------------------------------------------------------
 486
 487                 rrd_memory_mode = rrd_memory_mode_id(config_get("global", "memory mode", rrd_memory_mode_name(rrd_memory_mode)));
 488
 489                 // --------------------------------------------------------------------
 490
 491                 if(gethostname(buffer, HOSTNAME_MAX) == -1)
 492                         error("WARNING: Cannot get machine hostname.");
 493                 hostname = config_get("global", "hostname", buffer);
 494                 debug(D_OPTIONS, "hostname set to '%s'", hostname);
 495
 496                 // --------------------------------------------------------------------
 497
 498                 rrd_default_history_entries = (int) config_get_number("global", "history", RRD_DEFAULT_HISTORY_ENTRIES);
 499                 if(rrd_default_history_entries < 5 || rrd_default_history_entries > RRD_HISTORY_ENTRIES_MAX) {
 500                         info("Invalid save lines %d given. Defaulting to %d.", rrd_default_history_entries, RRD_DEFAULT_HISTORY_ENTRIES);
 501                         rrd_default_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
 502                 }
 503                 else {
 504                         debug(D_OPTIONS, "save lines set to %d.", rrd_default_history_entries);
 505                 }
 506
 507                 // --------------------------------------------------------------------
 508
 509                 rrd_update_every = (int) config_get_number("global", "update every", UPDATE_EVERY);
 510                 if(rrd_update_every < 1 || rrd_update_every > 600) {
 511                         info("Invalid update timer %d given. Defaulting to %d.", rrd_update_every, UPDATE_EVERY_MAX);
 512                         rrd_update_every = UPDATE_EVERY;
 513                 }
 514                 else debug(D_OPTIONS, "update timer set to %d.", rrd_update_every);
 515
 516                 // let the plugins know the min update_every
 517                 {
 518                         char buf[51];
 519                         snprintfz(buf, 50, "%d", rrd_update_every);
 520                         setenv("NETDATA_UPDATE_EVERY", buf, 1);
 521                 }
 522
 523                 // --------------------------------------------------------------------
 524
 525                 // block signals while initializing threads.
 526                 // this causes the threads to block signals.
 527                 sigset_t sigset;
 528                 sigfillset(&sigset);
 529
 530                 if(pthread_sigmask(SIG_BLOCK, &sigset, NULL) == -1) {
 531                         error("Could not block signals for threads");
 532                 }
 533
 534                 // Catch signals which we want to use to quit savely
 535                 struct sigaction sa;
 536                 sigemptyset(&sa.sa_mask);
 537                 sigaddset(&sa.sa_mask, SIGHUP);
 538                 sigaddset(&sa.sa_mask, SIGINT);
 539                 sigaddset(&sa.sa_mask, SIGTERM);
 540                 sa.sa_handler = sig_handler;
 541                 sa.sa_flags = 0;
 542                 if(sigaction(SIGHUP, &sa, NULL) == -1) {
 543                         error("Failed to change signal handler for SIGHUP");
 544                 }
 545                 if(sigaction(SIGINT, &sa, NULL) == -1) {
 546                         error("Failed to change signal handler for SIGINT");
 547                 }
 548                 if(sigaction(SIGTERM, &sa, NULL) == -1) {
 549                         error("Failed to change signal handler for SIGTERM");
 550                 }
 551                 // Ignore SIGPIPE completely.
 552                 // INFO: If we add signals here we have to unblock them
 553                 // at popen.c when running a external plugin.
 554                 sa.sa_handler = SIG_IGN;
 555                 if(sigaction(SIGPIPE, &sa, NULL) == -1) {
 556                         error("Failed to change signal handler for SIGTERM");
 557                 }
 558
 559                 // --------------------------------------------------------------------
 560
 561                 i = pthread_attr_init(&attr);
 562                 if(i != 0)
 563                         fatal("pthread_attr_init() failed with code %d.", i);
 564
 565                 i = pthread_attr_getstacksize(&attr, &stacksize);
 566                 if(i != 0)
 567                         fatal("pthread_attr_getstacksize() failed with code %d.", i);
 568                 else
 569                         debug(D_OPTIONS, "initial pthread stack size is %zu bytes", stacksize);
 570
 571                 wanted_stacksize = config_get_number("global", "pthread stack size", stacksize);
 572
 573                 // --------------------------------------------------------------------
 574
 575                 for (i = 0; static_threads[i].name != NULL ; i++) {
 576                         struct netdata_static_thread *st = &static_threads[i];
 577
 578                         if(st->config_name) st->enabled = config_get_boolean(st->config_section, st->config_name, st->enabled);
 579                         if(st->enabled && st->init_routine) st->init_routine();
 580                 }
 581
 582                 // --------------------------------------------------------------------
 583
 584                 // get the user we should run
 585                 // IMPORTANT: this is required before web_files_uid()
 586                 user = config_get("global", "run as user"    , (getuid() == 0)?NETDATA_USER:"");
 587
 588                 // IMPORTANT: these have to run once, while single threaded
 589                 web_files_uid(); // IMPORTANT: web_files_uid() before web_files_gid()
 590                 web_files_gid();
 591
 592                 // --------------------------------------------------------------------
 593
 594                 listen_backlog = (int) config_get_number("global", "http port listen backlog", LISTEN_BACKLOG);
 595
 596                 listen_port = (int) config_get_number("global", "port", LISTEN_PORT);
 597                 if(listen_port < 1 || listen_port > 65535) {
 598                         info("Invalid listen port %d given. Defaulting to %d.", listen_port, LISTEN_PORT);
 599                         listen_port = LISTEN_PORT;
 600                 }
 601                 else debug(D_OPTIONS, "Listen port set to %d.", listen_port);
 602
 603                 int ip = 0;
 604                 char *ipv = config_get("global", "ip version", "any");
 605                 if(!strcmp(ipv, "any") || !strcmp(ipv, "both") || !strcmp(ipv, "all")) ip = 0;
 606                 else if(!strcmp(ipv, "ipv4") || !strcmp(ipv, "IPV4") || !strcmp(ipv, "IPv4") || !strcmp(ipv, "4")) ip = 4;
 607                 else if(!strcmp(ipv, "ipv6") || !strcmp(ipv, "IPV6") || !strcmp(ipv, "IPv6") || !strcmp(ipv, "6")) ip = 6;
 608                 else info("Cannot understand ip version '%s'. Assuming 'any'.", ipv);
 609
 610                 if(ip == 0 || ip == 6) listen_fd = create_listen_socket6(config_get("global", "bind socket to IP", "*"), listen_port, listen_backlog);
 611                 if(listen_fd < 0) {
 612                         listen_fd = create_listen_socket4(config_get("global", "bind socket to IP", "*"), listen_port, listen_backlog);
 613                         if(listen_fd >= 0 && ip != 4) info("Managed to open an IPv4 socket on port %d.", listen_port);
 614                 }
 615
 616                 if(listen_fd < 0) fatal("Cannot listen socket.");
 617         }
 618
 619         // never become a problem
 620         if(nice(20) == -1) error("Cannot lower my CPU priority.");
 621
 622         if(become_daemon(dont_fork, 0, user, input_log_file, output_log_file, error_log_file, access_log_file, &access_fd, &stdaccess) == -1)
 623                 fatal("Cannot demonize myself.");
 624
 625 #ifdef NETDATA_INTERNAL_CHECKS
 626         if(debug_flags != 0) {
 627                 struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
 628                 if(setrlimit(RLIMIT_CORE, &rl) != 0)
 629                         info("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
 630                 prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
 631         }
 632 #endif /* NETDATA_INTERNAL_CHECKS */
 633
 634         if(output_log_syslog || error_log_syslog || access_log_syslog)
 635                 openlog("netdata", LOG_PID, LOG_DAEMON);
 636
 637         info("NetData started on pid %d", getpid());
 638
 639
 640         // ------------------------------------------------------------------------
 641         // get default pthread stack size
 642
 643         if(stacksize < wanted_stacksize) {
 644                 i = pthread_attr_setstacksize(&attr, wanted_stacksize);
 645                 if(i != 0)
 646                         fatal("pthread_attr_setstacksize() to %zu bytes, failed with code %d.", wanted_stacksize, i);
 647                 else
 648                         info("Successfully set pthread stacksize to %zu bytes", wanted_stacksize);
 649         }
 650
 651         // --------------------------------------------------------------------
 652         // initialize the registry
 653
 654         registry_init();
 655
 656         // ------------------------------------------------------------------------
 657         // spawn the threads
 658
 659         for (i = 0; static_threads[i].name != NULL ; i++) {
 660                 struct netdata_static_thread *st = &static_threads[i];
 661
 662                 if(st->enabled) {
 663                         st->thread = malloc(sizeof(pthread_t));
 664                         if(!st->thread)
 665                                 fatal("Cannot allocate pthread_t memory");
 666
 667                         info("Starting thread %s.", st->name);
 668
 669                         if(pthread_create(st->thread, &attr, st->start_routine, NULL))
 670                                 error("failed to create new thread for %s.", st->name);
 671
 672                         else if(pthread_detach(*st->thread))
 673                                 error("Cannot request detach of newly created %s thread.", st->name);
 674                 }
 675                 else info("Not starting thread %s.", st->name);
 676         }
 677
 678         // ------------------------------------------------------------------------
 679         // block signals while initializing threads.
 680         sigset_t sigset;
 681         sigfillset(&sigset);
 682
 683         if(pthread_sigmask(SIG_UNBLOCK, &sigset, NULL) == -1) {
 684                 error("Could not unblock signals for threads");
 685         }
 686
 687         // Handle flags set in the signal handler.
 688         while(1) {
 689                 pause();
 690                 if(netdata_exit) {
 691                         info("Exit main loop of netdata.");
 692                         netdata_cleanup_and_exit(0);
 693                         exit(0);
 694                 }
 695         }
 696 }