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