src/main.c

   1 #include "common.h"
   2
   3 extern void *cgroups_main(void *ptr);
   4
   5 void netdata_cleanup_and_exit(int ret) {
   6         netdata_exit = 1;
   7
   8         error_log_limit_unlimited();
   9
  10         info("Called: netdata_cleanup_and_exit()");
  11 #ifdef NETDATA_INTERNAL_CHECKS
  12     rrdset_free_all();
  13 #else
  14         rrdset_save_all();
  15 #endif
  16         // kill_childs();
  17
  18         if(pidfile[0]) {
  19                 if(unlink(pidfile) != 0)
  20                         error("Cannot unlink pidfile '%s'.", pidfile);
  21         }
  22
  23         info("NetData exiting. Bye bye...");
  24         exit(ret);
  25 }
  26
  27 struct netdata_static_thread {
  28         char *name;
  29
  30         char *config_section;
  31         char *config_name;
  32
  33         int enabled;
  34
  35         pthread_t *thread;
  36
  37         void (*init_routine) (void);
  38         void *(*start_routine) (void *);
  39 } static_threads[] = {
  40 #ifdef INTERNAL_PLUGIN_NFACCT
  41 // nfacct requires root access
  42         // so, we build it as an external plugin with setuid to root
  43         {"nfacct",              "plugins",  "nfacct",     1, NULL, NULL, nfacct_main},
  44 #endif
  45
  46         {"tc",                 "plugins",   "tc",         1, NULL, NULL, tc_main},
  47         {"idlejitter",         "plugins",   "idlejitter", 1, NULL, NULL, cpuidlejitter_main},
  48         {"proc",               "plugins",   "proc",       1, NULL, NULL, proc_main},
  49         {"cgroups",            "plugins",   "cgroups",    1, NULL, NULL, cgroups_main},
  50         {"plugins.d",           NULL,       NULL,         1, NULL, NULL, pluginsd_main},
  51         {"check",               "plugins",  "checks",     0, NULL, NULL, checks_main},
  52         {"web",                 NULL,       NULL,         1, NULL, NULL, socket_listen_main_multi_threaded},
  53         {"web-single-threaded", NULL,       NULL,         0, NULL, NULL, socket_listen_main_single_threaded},
  54         {NULL,                  NULL,       NULL,         0, NULL, NULL, NULL}
  55 };
  56
  57 void web_server_threading_selection(void) {
  58         int threaded = config_get_boolean("global", "multi threaded web server", 1);
  59
  60         int i;
  61         for(i = 0; static_threads[i].name ; i++) {
  62                 if(static_threads[i].start_routine == socket_listen_main_multi_threaded)
  63                         static_threads[i].enabled = threaded?1:0;
  64
  65                 if(static_threads[i].start_routine == socket_listen_main_single_threaded)
  66                         static_threads[i].enabled = threaded?0:1;
  67         }
  68
  69         web_client_timeout = (int) config_get_number("global", "disconnect idle web clients after seconds", DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS);
  70
  71         web_donotrack_comply = config_get_boolean("global", "respect web browser do not track policy", web_donotrack_comply);
  72
  73 #ifdef NETDATA_WITH_ZLIB
  74         web_enable_gzip = config_get_boolean("global", "enable web responses gzip compression", web_enable_gzip);
  75
  76         char *s = config_get("global", "web compression strategy", "default");
  77         if(!strcmp(s, "default"))
  78                 web_gzip_strategy = Z_DEFAULT_STRATEGY;
  79         else if(!strcmp(s, "filtered"))
  80                 web_gzip_strategy = Z_FILTERED;
  81         else if(!strcmp(s, "huffman only"))
  82                 web_gzip_strategy = Z_HUFFMAN_ONLY;
  83         else if(!strcmp(s, "rle"))
  84                 web_gzip_strategy = Z_RLE;
  85         else if(!strcmp(s, "fixed"))
  86                 web_gzip_strategy = Z_FIXED;
  87         else {
  88                 error("Invalid compression strategy '%s'. Valid strategies are 'default', 'filtered', 'huffman only', 'rle' and 'fixed'. Proceeding with 'default'.", s);
  89                 web_gzip_strategy = Z_DEFAULT_STRATEGY;
  90         }
  91
  92         web_gzip_level = (int)config_get_number("global", "web compression level", 3);
  93         if(web_gzip_level < 1) {
  94                 error("Invalid compression level %d. Valid levels are 1 (fastest) to 9 (best ratio). Proceeding with level 1 (fastest compression).", web_gzip_level);
  95                 web_gzip_level = 1;
  96         }
  97         else if(web_gzip_level > 9) {
  98                 error("Invalid compression level %d. Valid levels are 1 (fastest) to 9 (best ratio). Proceeding with level 9 (best compression).", web_gzip_level);
  99                 web_gzip_level = 9;
 100         }
 101 #endif /* NETDATA_WITH_ZLIB */
 102 }
 103
 104
 105 int killpid(pid_t pid, int sig)
 106 {
 107         int ret = -1;
 108         debug(D_EXIT, "Request to kill pid %d", pid);
 109
 110         errno = 0;
 111         if(kill(pid, 0) == -1) {
 112                 switch(errno) {
 113                         case ESRCH:
 114                                 error("Request to kill pid %d, but it is not running.", pid);
 115                                 break;
 116
 117                         case EPERM:
 118                                 error("Request to kill pid %d, but I do not have enough permissions.", pid);
 119                                 break;
 120
 121                         default:
 122                                 error("Request to kill pid %d, but I received an error.", pid);
 123                                 break;
 124                 }
 125         }
 126         else {
 127                 errno = 0;
 128                 ret = kill(pid, sig);
 129                 if(ret == -1) {
 130                         switch(errno) {
 131                                 case ESRCH:
 132                                         error("Cannot kill pid %d, but it is not running.", pid);
 133                                         break;
 134
 135                                 case EPERM:
 136                                         error("Cannot kill pid %d, but I do not have enough permissions.", pid);
 137                                         break;
 138
 139                                 default:
 140                                         error("Cannot kill pid %d, but I received an error.", pid);
 141                                         break;
 142                         }
 143                 }
 144         }
 145
 146         return ret;
 147 }
 148
 149 void kill_childs()
 150 {
 151         siginfo_t info;
 152
 153         struct web_client *w;
 154         for(w = web_clients; w ; w = w->next) {
 155                 debug(D_EXIT, "Stopping web client %s", w->client_ip);
 156                 pthread_cancel(w->thread);
 157                 pthread_join(w->thread, NULL);
 158         }
 159
 160         int i;
 161         for (i = 0; static_threads[i].name != NULL ; i++) {
 162                 if(static_threads[i].thread) {
 163                         debug(D_EXIT, "Stopping %s thread", static_threads[i].name);
 164                         pthread_cancel(*static_threads[i].thread);
 165                         pthread_join(*static_threads[i].thread, NULL);
 166                         static_threads[i].thread = NULL;
 167                 }
 168         }
 169
 170         if(tc_child_pid) {
 171                 info("Killing tc-qos-helper procees");
 172                 if(killpid(tc_child_pid, SIGTERM) != -1)
 173                         waitid(P_PID, (id_t) tc_child_pid, &info, WEXITED);
 174         }
 175         tc_child_pid = 0;
 176
 177         struct plugind *cd;
 178         for(cd = pluginsd_root ; cd ; cd = cd->next) {
 179                 debug(D_EXIT, "Stopping %s plugin thread", cd->id);
 180                 pthread_cancel(cd->thread);
 181                 pthread_join(cd->thread, NULL);
 182
 183                 if(cd->pid && !cd->obsolete) {
 184                         debug(D_EXIT, "killing %s plugin process", cd->id);
 185                         if(killpid(cd->pid, SIGTERM) != -1)
 186                                 waitid(P_PID, (id_t) cd->pid, &info, WEXITED);
 187                 }
 188         }
 189
 190         // if, for any reason there is any child exited
 191         // catch it here
 192         waitid(P_PID, 0, &info, WEXITED|WNOHANG);
 193
 194         debug(D_EXIT, "All threads/childs stopped.");
 195 }
 196
 197 struct option_def options[] = {
 198         // opt description                                                       arg name                     default value
 199         {'c', "Load alternate configuration file",                               "config_file",                          CONFIG_DIR "/" CONFIG_FILENAME},
 200         {'D', "Disable fork into background",                                    NULL,                                   NULL},
 201         {'h', "Display help message",                                            NULL,                                   NULL},
 202         {'P', "File to save a pid while running",                                "FILE",                                 NULL},
 203         {'i', "The IP address to listen to.",                                    "address",                              "All addresses"},
 204         {'p', "Port to listen. Can be from 1 to 65535.",                         "port_number",                          "19999"},
 205         {'s', "Path to access host /proc and /sys when running in a container.", "PATH",                                 NULL},
 206         {'t', "The frequency in seconds, for data collection. \
 207 Same as 'update every' config file option.",                                 "seconds",                              "1"},
 208         {'u', "System username to run as.",                                      "username",                             "netdata"},
 209         {'v', "Version of the program",                                          NULL,                                   NULL},
 210         {'W', "vendor options.",                                                 "stacksize=<size>|unittest|debug_flag", NULL},
 211 };
 212
 213 void help(int exitcode) {
 214         FILE *stream;
 215         if(exitcode == 0)
 216                 stream = stdout;
 217         else
 218                 stream = stderr;
 219
 220         int num_opts = sizeof(options) / sizeof(struct option_def);
 221         int i;
 222         int max_len_arg = 0;
 223
 224         // Compute maximum argument length
 225         for( i = 0; i < num_opts; i++ ) {
 226                 if(options[i].arg_name) {
 227                         int len_arg = strlen(options[i].arg_name);
 228                         if(len_arg > max_len_arg) max_len_arg = len_arg;
 229                 }
 230         }
 231
 232         fprintf(stream, "SYNOPSIS: netdata [options]\n");
 233         fprintf(stream, "\n");
 234         fprintf(stream, "Options:\n");
 235
 236         // Output options description.
 237         for( i = 0; i < num_opts; i++ ) {
 238                 fprintf(stream, "  -%c %-*s  %s", options[i].val, max_len_arg, options[i].arg_name ? options[i].arg_name : "", options[i].description);
 239                 if(options[i].default_value) {
 240                         fprintf(stream, " Default: %s\n", options[i].default_value);
 241                 } else {
 242                         fprintf(stream, "\n");
 243                 }
 244         }
 245
 246         fflush(stream);
 247         exit(exitcode);
 248 }
 249
 250 // TODO: Remove this function with the nix major release.
 251 void remove_option(int opt_index, int *argc, char **argv) {
 252         int i = opt_index;
 253         // remove the options.
 254         do {
 255                 *argc = *argc - 1;
 256                 for(i = opt_index; i < *argc; i++) {
 257                         argv[i] = argv[i+1];
 258                 }
 259                 i = opt_index;
 260         } while(argv[i][0] != '-' && opt_index >= *argc);
 261 }
 262
 263
 264 int main(int argc, char **argv)
 265 {
 266         int i;
 267         int config_loaded = 0;
 268         int dont_fork = 0;
 269         size_t wanted_stacksize = 0, stacksize = 0;
 270         pthread_attr_t attr;
 271
 272         // global initialization
 273         get_HZ();
 274
 275         // set the name for logging
 276         program_name = "netdata";
 277
 278         // parse command line.
 279
 280         // parse depercated options
 281         // TODO: Remove this block with the next major release.
 282         {
 283                 i = 1;
 284                 while(i < argc) {
 285                         if(strcmp(argv[i], "-pidfile") == 0 && (i+1) < argc) {
 286                                 strncpyz(pidfile, argv[i+1], FILENAME_MAX);
 287                                 fprintf(stderr, "%s: deprecated option -- %s -- please use -P instead.\n", argv[0], argv[i]);
 288                                 remove_option(i, &argc, argv);
 289                         }
 290                         else if(strcmp(argv[i], "-nodaemon") == 0 || strcmp(argv[i], "-nd") == 0) {
 291                                 dont_fork = 1;
 292                                 fprintf(stderr, "%s: deprecated option -- %s -- please use -D instead.\n ", argv[0], argv[i]);
 293                                 remove_option(i, &argc, argv);
 294                         }
 295                         else if(strcmp(argv[i], "-ch") == 0 && (i+1) < argc) {
 296                                 config_set("global", "host access prefix", argv[i+1]);
 297                                 fprintf(stderr, "%s: deprecated option -- %s -- please use -s instead.\n", argv[0], argv[i]);
 298                                 remove_option(i, &argc, argv);
 299                         }
 300                         else if(strcmp(argv[i], "-l") == 0 && (i+1) < argc) {
 301                                 config_set("global", "history", argv[i+1]);
 302                                 fprintf(stderr, "%s: deprecated option -- %s -- This option will be removed with V2.*.\n", argv[0], argv[i]);
 303                                 remove_option(i, &argc, argv);
 304                         }
 305                         else i++;
 306                 }
 307         }
 308
 309         // parse options
 310         {
 311                 int num_opts = sizeof(options) / sizeof(struct option_def);
 312                 char optstring[(num_opts * 2) + 1];
 313
 314                 int string_i = 0;
 315                 for( i = 0; i < num_opts; i++ ) {
 316                         optstring[string_i] = options[i].val;
 317                         string_i++;
 318                         if(options[i].arg_name) {
 319                                 optstring[string_i] = ':';
 320                                 string_i++;
 321                         }
 322                 }
 323
 324                 int opt;
 325                 while( (opt = getopt(argc, argv, optstring)) != -1 ) {
 326                         switch(opt) {
 327                                 case 'c':
 328                                         if(load_config(optarg, 1) != 1) {
 329                                                 error("Cannot load configuration file %s.", optarg);
 330                                                 exit(1);
 331                                         }
 332                                         else {
 333                                                 debug(D_OPTIONS, "Configuration loaded from %s.", optarg);
 334                                                 config_loaded = 1;
 335                                         }
 336                                         break;
 337                                 case 'D':
 338                                         dont_fork = 1;
 339                                         break;
 340                                 case 'h':
 341                                         help(0);
 342                                         break;
 343                                 case 'i':
 344                                         config_set("global", "bind to", optarg);
 345                                         break;
 346                                 case 'P':
 347                                         strncpy(pidfile, optarg, FILENAME_MAX);
 348                                         pidfile[FILENAME_MAX] = '\0';
 349                                         break;
 350                                 case 'p':
 351                                         config_set("global", "default port", optarg);
 352                                         break;
 353                                 case 's':
 354                                         config_set("global", "host access prefix", optarg);
 355                                         break;
 356                                 case 't':
 357                                         config_set("global", "update every", optarg);
 358                                         break;
 359                                 case 'u':
 360                                         config_set("global", "run as user", optarg);
 361                                         break;
 362                                 case 'v':
 363                                         // TODO: Outsource version to makefile which can compute version from git.
 364                                         printf("netdata 1.2.1_master\n");
 365                                         return 0;
 366                                         break;
 367                                 case 'W':
 368                                         {
 369                                                 char* stacksize = "stacksize=";
 370                                                 char* debug_flags_string = "debug_flags=";
 371                                                 if(strcmp(optarg, "unittest") == 0) {
 372                                                         rrd_update_every = 1;
 373                                                         if(run_all_mockup_tests()) exit(1);
 374                                                         if(unit_test_storage()) exit(1);
 375                                                         fprintf(stderr, "\n\nALL TESTS PASSED\n\n");
 376                                                         exit(0);
 377                                                 } else if(strncmp(optarg, stacksize, strlen(stacksize)) == 0) {
 378                                                         optarg += strlen(stacksize);
 379                                                         config_set("global", "pthread stack size", optarg);
 380                                                 } else if(strncmp(optarg, debug_flags_string, strlen(debug_flags_string)) == 0) {
 381                                                         optarg += strlen(debug_flags_string);
 382                                                         config_set("global", "debug flags",  optarg);
 383                                                         debug_flags = strtoull(optarg, NULL, 0);
 384                                                 }
 385                                         }
 386                                         break;
 387                                 default: /* ? */
 388                                         help(1);
 389                                         break;
 390                         }
 391                 }
 392         }
 393
 394         if(!config_loaded) load_config(NULL, 0);
 395
 396         // prepare configuration environment variables for the plugins
 397         setenv("NETDATA_CONFIG_DIR" , config_get("global", "config directory"   , CONFIG_DIR) , 1);
 398         setenv("NETDATA_PLUGINS_DIR", config_get("global", "plugins directory"  , PLUGINS_DIR), 1);
 399         setenv("NETDATA_WEB_DIR"    , config_get("global", "web files directory", WEB_DIR)    , 1);
 400         setenv("NETDATA_CACHE_DIR"  , config_get("global", "cache directory"    , CACHE_DIR)  , 1);
 401         setenv("NETDATA_LIB_DIR"    , config_get("global", "lib directory"      , VARLIB_DIR) , 1);
 402         setenv("NETDATA_LOG_DIR"    , config_get("global", "log directory"      , LOG_DIR)    , 1);
 403         setenv("NETDATA_HOST_PREFIX", config_get("global", "host access prefix" , "")         , 1);
 404         setenv("HOME"               , config_get("global", "home directory"     , CACHE_DIR)  , 1);
 405
 406         // disable buffering for python plugins
 407         setenv("PYTHONUNBUFFERED", "1", 1);
 408
 409         // avoid flood calls to stat(/etc/localtime)
 410         // http://stackoverflow.com/questions/4554271/how-to-avoid-excessive-stat-etc-localtime-calls-in-strftime-on-linux
 411         setenv("TZ", ":/etc/localtime", 0);
 412
 413         {
 414                 char path[1024 + 1], *p = getenv("PATH");
 415                 if(!p) p = "/bin:/usr/bin";
 416                 snprintfz(path, 1024, "%s:%s", p, "/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin");
 417                 setenv("PATH", config_get("plugins", "PATH environment variable", path), 1);
 418         }
 419
 420         // cd to /tmp to avoid any plugins writing files at random places
 421         if(chdir("/tmp")) error("netdata: ERROR: Cannot cd to /tmp");
 422
 423         char *input_log_file = NULL;
 424         char *output_log_file = NULL;
 425         char *error_log_file = NULL;
 426         char *access_log_file = NULL;
 427         char *user = NULL;
 428         {
 429                 char *flags = config_get("global", "debug flags",  "0x00000000");
 430                 setenv("NETDATA_DEBUG_FLAGS", flags, 1);
 431
 432                 debug_flags = strtoull(flags, NULL, 0);
 433                 debug(D_OPTIONS, "Debug flags set to '0x%8llx'.", debug_flags);
 434
 435                 if(debug_flags != 0) {
 436                         struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
 437                         if(setrlimit(RLIMIT_CORE, &rl) != 0)
 438                                 info("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
 439                         prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
 440                 }
 441
 442                 // --------------------------------------------------------------------
 443
 444 #ifdef MADV_MERGEABLE
 445                 enable_ksm = config_get_boolean("global", "memory deduplication (ksm)", enable_ksm);
 446 #else
 447 #warning "Kernel memory deduplication (KSM) is not available"
 448 #endif
 449
 450                 // --------------------------------------------------------------------
 451
 452
 453                 global_host_prefix = config_get("global", "host access prefix", "");
 454                 setenv("NETDATA_HOST_PREFIX", global_host_prefix, 1);
 455
 456                 // --------------------------------------------------------------------
 457
 458                 output_log_file = config_get("global", "debug log", LOG_DIR "/debug.log");
 459                 if(strcmp(output_log_file, "syslog") == 0) {
 460                         output_log_syslog = 1;
 461                         output_log_file = NULL;
 462                 }
 463                 else if(strcmp(output_log_file, "none") == 0) {
 464                         output_log_syslog = 0;
 465                         output_log_file = NULL;
 466                 }
 467                 else output_log_syslog = 0;
 468
 469                 // --------------------------------------------------------------------
 470
 471                 error_log_file = config_get("global", "error log", LOG_DIR "/error.log");
 472                 if(strcmp(error_log_file, "syslog") == 0) {
 473                         error_log_syslog = 1;
 474                         error_log_file = NULL;
 475                 }
 476                 else if(strcmp(error_log_file, "none") == 0) {
 477                         error_log_syslog = 0;
 478                         error_log_file = NULL;
 479                         // optimization - do not even generate debug log entries
 480                 }
 481                 else error_log_syslog = 0;
 482
 483                 error_log_throttle_period = config_get_number("global", "errors flood protection period", error_log_throttle_period);
 484                 setenv("NETDATA_ERRORS_THROTTLE_PERIOD", config_get("global", "errors flood protection period"    , ""), 1);
 485
 486                 error_log_errors_per_period = (unsigned long)config_get_number("global", "errors to trigger flood protection", error_log_errors_per_period);
 487                 setenv("NETDATA_ERRORS_PER_PERIOD"     , config_get("global", "errors to trigger flood protection", ""), 1);
 488
 489                 // --------------------------------------------------------------------
 490
 491                 access_log_file = config_get("global", "access log", LOG_DIR "/access.log");
 492                 if(strcmp(access_log_file, "syslog") == 0) {
 493                         access_log_syslog = 1;
 494                         access_log_file = NULL;
 495                 }
 496                 else if(strcmp(access_log_file, "none") == 0) {
 497                         access_log_syslog = 0;
 498                         access_log_file = NULL;
 499                 }
 500                 else access_log_syslog = 0;
 501
 502                 // --------------------------------------------------------------------
 503
 504                 rrd_memory_mode = rrd_memory_mode_id(config_get("global", "memory mode", rrd_memory_mode_name(rrd_memory_mode)));
 505
 506                 // --------------------------------------------------------------------
 507
 508                 {
 509                         char hostnamebuf[HOSTNAME_MAX + 1];
 510                         if(gethostname(hostnamebuf, HOSTNAME_MAX) == -1)
 511                                 error("WARNING: Cannot get machine hostname.");
 512                         hostname = config_get("global", "hostname", hostnamebuf);
 513                         debug(D_OPTIONS, "hostname set to '%s'", hostname);
 514                 }
 515
 516                 // --------------------------------------------------------------------
 517
 518                 rrd_default_history_entries = (int) config_get_number("global", "history", RRD_DEFAULT_HISTORY_ENTRIES);
 519                 if(rrd_default_history_entries < 5 || rrd_default_history_entries > RRD_HISTORY_ENTRIES_MAX) {
 520                         info("Invalid save lines %d given. Defaulting to %d.", rrd_default_history_entries, RRD_DEFAULT_HISTORY_ENTRIES);
 521                         rrd_default_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
 522                 }
 523                 else {
 524                         debug(D_OPTIONS, "save lines set to %d.", rrd_default_history_entries);
 525                 }
 526
 527                 // --------------------------------------------------------------------
 528
 529                 rrd_update_every = (int) config_get_number("global", "update every", UPDATE_EVERY);
 530                 if(rrd_update_every < 1 || rrd_update_every > 600) {
 531                         info("Invalid update timer %d given. Defaulting to %d.", rrd_update_every, UPDATE_EVERY_MAX);
 532                         rrd_update_every = UPDATE_EVERY;
 533                 }
 534                 else debug(D_OPTIONS, "update timer set to %d.", rrd_update_every);
 535
 536                 // let the plugins know the min update_every
 537                 {
 538                         char buf[16];
 539                         snprintfz(buf, 15, "%d", rrd_update_every);
 540                         setenv("NETDATA_UPDATE_EVERY", buf, 1);
 541                 }
 542
 543                 // --------------------------------------------------------------------
 544
 545                 // block signals while initializing threads.
 546                 // this causes the threads to block signals.
 547                 sigset_t sigset;
 548                 sigfillset(&sigset);
 549
 550                 if(pthread_sigmask(SIG_BLOCK, &sigset, NULL) == -1) {
 551                         error("Could not block signals for threads");
 552                 }
 553
 554                 // Catch signals which we want to use to quit savely
 555                 struct sigaction sa;
 556                 sigemptyset(&sa.sa_mask);
 557                 sigaddset(&sa.sa_mask, SIGHUP);
 558                 sigaddset(&sa.sa_mask, SIGINT);
 559                 sigaddset(&sa.sa_mask, SIGTERM);
 560                 sa.sa_handler = sig_handler_exit;
 561                 sa.sa_flags = 0;
 562                 if(sigaction(SIGHUP, &sa, NULL) == -1) {
 563                         error("Failed to change signal handler for SIGHUP");
 564                 }
 565                 if(sigaction(SIGINT, &sa, NULL) == -1) {
 566                         error("Failed to change signal handler for SIGINT");
 567                 }
 568                 if(sigaction(SIGTERM, &sa, NULL) == -1) {
 569                         error("Failed to change signal handler for SIGTERM");
 570                 }
 571
 572                 // save database on SIGUSR1
 573                 sa.sa_handler = sig_handler_save;
 574                 if(sigaction(SIGUSR1, &sa, NULL) == -1) {
 575                         error("Failed to change signal handler for SIGUSR1");
 576                 }
 577
 578                 // Ignore SIGPIPE completely.
 579                 // INFO: If we add signals here we have to unblock them
 580                 // at popen.c when running a external plugin.
 581                 sa.sa_handler = SIG_IGN;
 582                 if(sigaction(SIGPIPE, &sa, NULL) == -1) {
 583                         error("Failed to change signal handler for SIGPIPE");
 584                 }
 585
 586                 // --------------------------------------------------------------------
 587
 588                 i = pthread_attr_init(&attr);
 589                 if(i != 0)
 590                         fatal("pthread_attr_init() failed with code %d.", i);
 591
 592                 i = pthread_attr_getstacksize(&attr, &stacksize);
 593                 if(i != 0)
 594                         fatal("pthread_attr_getstacksize() failed with code %d.", i);
 595                 else
 596                         debug(D_OPTIONS, "initial pthread stack size is %zu bytes", stacksize);
 597
 598                 wanted_stacksize = config_get_number("global", "pthread stack size", stacksize);
 599
 600                 // --------------------------------------------------------------------
 601
 602                 for (i = 0; static_threads[i].name != NULL ; i++) {
 603                         struct netdata_static_thread *st = &static_threads[i];
 604
 605                         if(st->config_name) st->enabled = config_get_boolean(st->config_section, st->config_name, st->enabled);
 606                         if(st->enabled && st->init_routine) st->init_routine();
 607                 }
 608
 609                 // --------------------------------------------------------------------
 610
 611                 // get the user we should run
 612                 // IMPORTANT: this is required before web_files_uid()
 613                 user = config_get("global", "run as user"    , (getuid() == 0)?NETDATA_USER:"");
 614
 615                 // IMPORTANT: these have to run once, while single threaded
 616                 web_files_uid(); // IMPORTANT: web_files_uid() before web_files_gid()
 617                 web_files_gid();
 618
 619                 // --------------------------------------------------------------------
 620
 621                 create_listen_sockets();
 622         }
 623
 624         // never become a problem
 625         if(nice(20) == -1) error("Cannot lower my CPU priority.");
 626
 627         if(become_daemon(dont_fork, 0, user, input_log_file, output_log_file, error_log_file, access_log_file, &access_fd, &stdaccess) == -1)
 628                 fatal("Cannot demonize myself.");
 629
 630 #ifdef NETDATA_INTERNAL_CHECKS
 631         if(debug_flags != 0) {
 632                 struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
 633                 if(setrlimit(RLIMIT_CORE, &rl) != 0)
 634                         info("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
 635                 prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
 636         }
 637 #endif /* NETDATA_INTERNAL_CHECKS */
 638
 639         if(output_log_syslog || error_log_syslog || access_log_syslog)
 640                 openlog("netdata", LOG_PID, LOG_DAEMON);
 641
 642         info("NetData started on pid %d", getpid());
 643
 644
 645         // ------------------------------------------------------------------------
 646         // get default pthread stack size
 647
 648         if(stacksize < wanted_stacksize) {
 649                 i = pthread_attr_setstacksize(&attr, wanted_stacksize);
 650                 if(i != 0)
 651                         fatal("pthread_attr_setstacksize() to %zu bytes, failed with code %d.", wanted_stacksize, i);
 652                 else
 653                         info("Successfully set pthread stacksize to %zu bytes", wanted_stacksize);
 654         }
 655
 656         // --------------------------------------------------------------------
 657         // initialize the registry
 658
 659         registry_init();
 660
 661         // ------------------------------------------------------------------------
 662         // spawn the threads
 663
 664         web_server_threading_selection();
 665
 666         for (i = 0; static_threads[i].name != NULL ; i++) {
 667                 struct netdata_static_thread *st = &static_threads[i];
 668
 669                 if(st->enabled) {
 670                         st->thread = mallocz(sizeof(pthread_t));
 671
 672                         info("Starting thread %s.", st->name);
 673
 674                         if(pthread_create(st->thread, &attr, st->start_routine, NULL))
 675                                 error("failed to create new thread for %s.", st->name);
 676
 677                         else if(pthread_detach(*st->thread))
 678                                 error("Cannot request detach of newly created %s thread.", st->name);
 679                 }
 680                 else info("Not starting thread %s.", st->name);
 681         }
 682
 683         // ------------------------------------------------------------------------
 684         // block signals while initializing threads.
 685         sigset_t sigset;
 686         sigfillset(&sigset);
 687
 688         if(pthread_sigmask(SIG_UNBLOCK, &sigset, NULL) == -1) {
 689                 error("Could not unblock signals for threads");
 690         }
 691
 692         // Handle flags set in the signal handler.
 693         while(1) {
 694                 pause();
 695                 if(netdata_exit) {
 696                         info("Exit main loop of netdata.");
 697                         netdata_cleanup_and_exit(0);
 698                         exit(0);
 699                 }
 700         }
 701 }