src/main.c

   1 #include "common.h"
   2
   3 extern void *cgroups_main(void *ptr);
   4
   5 volatile sig_atomic_t netdata_exit = 0;
   6
   7 void netdata_cleanup_and_exit(int ret) {
   8         netdata_exit = 1;
   9
  10         error_log_limit_unlimited();
  11
  12         info("Called: netdata_cleanup_and_exit()");
  13 #ifdef NETDATA_INTERNAL_CHECKS
  14     rrdset_free_all();
  15 #else
  16         rrdset_save_all();
  17 #endif
  18         // kill_childs();
  19
  20         if(pidfile[0]) {
  21                 if(unlink(pidfile) != 0)
  22                         error("Cannot unlink pidfile '%s'.", pidfile);
  23         }
  24
  25         info("NetData exiting. Bye bye...");
  26         exit(ret);
  27 }
  28
  29 struct netdata_static_thread {
  30         char *name;
  31
  32         char *config_section;
  33         char *config_name;
  34
  35         int enabled;
  36
  37         pthread_t *thread;
  38
  39         void (*init_routine) (void);
  40         void *(*start_routine) (void *);
  41 } static_threads[] = {
  42 #ifdef INTERNAL_PLUGIN_NFACCT
  43 // nfacct requires root access
  44         // so, we build it as an external plugin with setuid to root
  45         {"nfacct",              "plugins",  "nfacct",     1, NULL, NULL, nfacct_main},
  46 #endif
  47
  48         {"tc",                 "plugins",   "tc",         1, NULL, NULL, tc_main},
  49         {"idlejitter",         "plugins",   "idlejitter", 1, NULL, NULL, cpuidlejitter_main},
  50         {"proc",               "plugins",   "proc",       1, NULL, NULL, proc_main},
  51         {"cgroups",            "plugins",   "cgroups",    1, NULL, NULL, cgroups_main},
  52         {"plugins.d",           NULL,       NULL,         1, NULL, NULL, pluginsd_main},
  53         {"check",               "plugins",  "checks",     0, NULL, NULL, checks_main},
  54         {"web",                 NULL,       NULL,         1, NULL, NULL, socket_listen_main_multi_threaded},
  55         {"web-single-threaded", NULL,       NULL,         0, NULL, NULL, socket_listen_main_single_threaded},
  56         {NULL,                  NULL,       NULL,         0, NULL, NULL, NULL}
  57 };
  58
  59 void web_server_threading_selection(void) {
  60         int threaded = config_get_boolean("global", "multi threaded web server", 1);
  61
  62         int i;
  63         for(i = 0; static_threads[i].name ; i++) {
  64                 if(static_threads[i].start_routine == socket_listen_main_multi_threaded)
  65                         static_threads[i].enabled = threaded?1:0;
  66
  67                 if(static_threads[i].start_routine == socket_listen_main_single_threaded)
  68                         static_threads[i].enabled = threaded?0:1;
  69         }
  70
  71         web_client_timeout = (int) config_get_number("global", "disconnect idle web clients after seconds", DEFAULT_DISCONNECT_IDLE_WEB_CLIENTS_AFTER_SECONDS);
  72
  73         web_donotrack_comply = config_get_boolean("global", "respect web browser do not track policy", web_donotrack_comply);
  74
  75 #ifdef NETDATA_WITH_ZLIB
  76         web_enable_gzip = config_get_boolean("global", "enable web responses gzip compression", web_enable_gzip);
  77
  78         char *s = config_get("global", "web compression strategy", "default");
  79         if(!strcmp(s, "default"))
  80                 web_gzip_strategy = Z_DEFAULT_STRATEGY;
  81         else if(!strcmp(s, "filtered"))
  82                 web_gzip_strategy = Z_FILTERED;
  83         else if(!strcmp(s, "huffman only"))
  84                 web_gzip_strategy = Z_HUFFMAN_ONLY;
  85         else if(!strcmp(s, "rle"))
  86                 web_gzip_strategy = Z_RLE;
  87         else if(!strcmp(s, "fixed"))
  88                 web_gzip_strategy = Z_FIXED;
  89         else {
  90                 error("Invalid compression strategy '%s'. Valid strategies are 'default', 'filtered', 'huffman only', 'rle' and 'fixed'. Proceeding with 'default'.", s);
  91                 web_gzip_strategy = Z_DEFAULT_STRATEGY;
  92         }
  93
  94         web_gzip_level = (int)config_get_number("global", "web compression level", 3);
  95         if(web_gzip_level < 1) {
  96                 error("Invalid compression level %d. Valid levels are 1 (fastest) to 9 (best ratio). Proceeding with level 1 (fastest compression).", web_gzip_level);
  97                 web_gzip_level = 1;
  98         }
  99         else if(web_gzip_level > 9) {
 100                 error("Invalid compression level %d. Valid levels are 1 (fastest) to 9 (best ratio). Proceeding with level 9 (best compression).", web_gzip_level);
 101                 web_gzip_level = 9;
 102         }
 103 #endif /* NETDATA_WITH_ZLIB */
 104 }
 105
 106
 107 int killpid(pid_t pid, int sig)
 108 {
 109         int ret = -1;
 110         debug(D_EXIT, "Request to kill pid %d", pid);
 111
 112         errno = 0;
 113         if(kill(pid, 0) == -1) {
 114                 switch(errno) {
 115                         case ESRCH:
 116                                 error("Request to kill pid %d, but it is not running.", pid);
 117                                 break;
 118
 119                         case EPERM:
 120                                 error("Request to kill pid %d, but I do not have enough permissions.", pid);
 121                                 break;
 122
 123                         default:
 124                                 error("Request to kill pid %d, but I received an error.", pid);
 125                                 break;
 126                 }
 127         }
 128         else {
 129                 errno = 0;
 130                 ret = kill(pid, sig);
 131                 if(ret == -1) {
 132                         switch(errno) {
 133                                 case ESRCH:
 134                                         error("Cannot kill pid %d, but it is not running.", pid);
 135                                         break;
 136
 137                                 case EPERM:
 138                                         error("Cannot kill pid %d, but I do not have enough permissions.", pid);
 139                                         break;
 140
 141                                 default:
 142                                         error("Cannot kill pid %d, but I received an error.", pid);
 143                                         break;
 144                         }
 145                 }
 146         }
 147
 148         return ret;
 149 }
 150
 151 void kill_childs()
 152 {
 153         siginfo_t info;
 154
 155         struct web_client *w;
 156         for(w = web_clients; w ; w = w->next) {
 157                 debug(D_EXIT, "Stopping web client %s", w->client_ip);
 158                 pthread_cancel(w->thread);
 159                 pthread_join(w->thread, NULL);
 160         }
 161
 162         int i;
 163         for (i = 0; static_threads[i].name != NULL ; i++) {
 164                 if(static_threads[i].thread) {
 165                         debug(D_EXIT, "Stopping %s thread", static_threads[i].name);
 166                         pthread_cancel(*static_threads[i].thread);
 167                         pthread_join(*static_threads[i].thread, NULL);
 168                         static_threads[i].thread = NULL;
 169                 }
 170         }
 171
 172         if(tc_child_pid) {
 173                 info("Killing tc-qos-helper procees");
 174                 if(killpid(tc_child_pid, SIGTERM) != -1)
 175                         waitid(P_PID, (id_t) tc_child_pid, &info, WEXITED);
 176         }
 177         tc_child_pid = 0;
 178
 179         struct plugind *cd;
 180         for(cd = pluginsd_root ; cd ; cd = cd->next) {
 181                 debug(D_EXIT, "Stopping %s plugin thread", cd->id);
 182                 pthread_cancel(cd->thread);
 183                 pthread_join(cd->thread, NULL);
 184
 185                 if(cd->pid && !cd->obsolete) {
 186                         debug(D_EXIT, "killing %s plugin process", cd->id);
 187                         if(killpid(cd->pid, SIGTERM) != -1)
 188                                 waitid(P_PID, (id_t) cd->pid, &info, WEXITED);
 189                 }
 190         }
 191
 192         // if, for any reason there is any child exited
 193         // catch it here
 194         waitid(P_PID, 0, &info, WEXITED|WNOHANG);
 195
 196         debug(D_EXIT, "All threads/childs stopped.");
 197 }
 198
 199 struct option_def options[] = {
 200         // opt description                                                       arg name                     default value
 201         {'c', "Load alternate configuration file",                               "config_file",                          CONFIG_DIR "/" CONFIG_FILENAME},
 202         {'D', "Disable fork into background",                                    NULL,                                   NULL},
 203         {'h', "Display help message",                                            NULL,                                   NULL},
 204         {'P', "File to save a pid while running",                                "FILE",                                 NULL},
 205         {'i', "The IP address to listen to.",                                    "address",                              "All addresses"},
 206         {'p', "Port to listen. Can be from 1 to 65535.",                         "port_number",                          "19999"},
 207         {'s', "Path to access host /proc and /sys when running in a container.", "PATH",                                 NULL},
 208         {'t', "The frequency in seconds, for data collection. \
 209 Same as 'update every' config file option.",                                 "seconds",                              "1"},
 210         {'u', "System username to run as.",                                      "username",                             "netdata"},
 211         {'v', "Version of the program",                                          NULL,                                   NULL},
 212         {'W', "vendor options.",                                                 "stacksize=<size>|unittest|debug_flag", NULL},
 213 };
 214
 215 void help(int exitcode) {
 216         FILE *stream;
 217         if(exitcode == 0)
 218                 stream = stdout;
 219         else
 220                 stream = stderr;
 221
 222         int num_opts = sizeof(options) / sizeof(struct option_def);
 223         int i;
 224         int max_len_arg = 0;
 225
 226         // Compute maximum argument length
 227         for( i = 0; i < num_opts; i++ ) {
 228                 if(options[i].arg_name) {
 229                         int len_arg = strlen(options[i].arg_name);
 230                         if(len_arg > max_len_arg) max_len_arg = len_arg;
 231                 }
 232         }
 233
 234         fprintf(stream, "SYNOPSIS: netdata [options]\n");
 235         fprintf(stream, "\n");
 236         fprintf(stream, "Options:\n");
 237
 238         // Output options description.
 239         for( i = 0; i < num_opts; i++ ) {
 240                 fprintf(stream, "  -%c %-*s  %s", options[i].val, max_len_arg, options[i].arg_name ? options[i].arg_name : "", options[i].description);
 241                 if(options[i].default_value) {
 242                         fprintf(stream, " Default: %s\n", options[i].default_value);
 243                 } else {
 244                         fprintf(stream, "\n");
 245                 }
 246         }
 247
 248         fflush(stream);
 249         exit(exitcode);
 250 }
 251
 252 // TODO: Remove this function with the nix major release.
 253 void remove_option(int opt_index, int *argc, char **argv) {
 254         int i = opt_index;
 255         // remove the options.
 256         do {
 257                 *argc = *argc - 1;
 258                 for(i = opt_index; i < *argc; i++) {
 259                         argv[i] = argv[i+1];
 260                 }
 261                 i = opt_index;
 262         } while(argv[i][0] != '-' && opt_index >= *argc);
 263 }
 264
 265
 266 int main(int argc, char **argv)
 267 {
 268         int i;
 269         int config_loaded = 0;
 270         int dont_fork = 0;
 271         size_t wanted_stacksize = 0, stacksize = 0;
 272         pthread_attr_t attr;
 273
 274         // global initialization
 275         get_HZ();
 276
 277         // set the name for logging
 278         program_name = "netdata";
 279
 280         // parse command line.
 281
 282         // parse depercated options
 283         // TODO: Remove this block with the next major release.
 284         {
 285                 i = 1;
 286                 while(i < argc) {
 287                         if(strcmp(argv[i], "-pidfile") == 0 && (i+1) < argc) {
 288                                 strncpyz(pidfile, argv[i+1], FILENAME_MAX);
 289                                 fprintf(stderr, "%s: deprecated option -- %s -- please use -P instead.\n", argv[0], argv[i]);
 290                                 remove_option(i, &argc, argv);
 291                         }
 292                         else if(strcmp(argv[i], "-nodaemon") == 0 || strcmp(argv[i], "-nd") == 0) {
 293                                 dont_fork = 1;
 294                                 fprintf(stderr, "%s: deprecated option -- %s -- please use -D instead.\n ", argv[0], argv[i]);
 295                                 remove_option(i, &argc, argv);
 296                         }
 297                         else if(strcmp(argv[i], "-ch") == 0 && (i+1) < argc) {
 298                                 config_set("global", "host access prefix", argv[i+1]);
 299                                 fprintf(stderr, "%s: deprecated option -- %s -- please use -s instead.\n", argv[0], argv[i]);
 300                                 remove_option(i, &argc, argv);
 301                         }
 302                         else if(strcmp(argv[i], "-l") == 0 && (i+1) < argc) {
 303                                 config_set("global", "history", argv[i+1]);
 304                                 fprintf(stderr, "%s: deprecated option -- %s -- This option will be removed with V2.*.\n", argv[0], argv[i]);
 305                                 remove_option(i, &argc, argv);
 306                         }
 307                         else i++;
 308                 }
 309         }
 310
 311         // parse options
 312         {
 313                 int num_opts = sizeof(options) / sizeof(struct option_def);
 314                 char optstring[(num_opts * 2) + 1];
 315
 316                 int string_i = 0;
 317                 for( i = 0; i < num_opts; i++ ) {
 318                         optstring[string_i] = options[i].val;
 319                         string_i++;
 320                         if(options[i].arg_name) {
 321                                 optstring[string_i] = ':';
 322                                 string_i++;
 323                         }
 324                 }
 325
 326                 int opt;
 327                 while( (opt = getopt(argc, argv, optstring)) != -1 ) {
 328                         switch(opt) {
 329                                 case 'c':
 330                                         if(load_config(optarg, 1) != 1) {
 331                                                 error("Cannot load configuration file %s.", optarg);
 332                                                 exit(1);
 333                                         }
 334                                         else {
 335                                                 debug(D_OPTIONS, "Configuration loaded from %s.", optarg);
 336                                                 config_loaded = 1;
 337                                         }
 338                                         break;
 339                                 case 'D':
 340                                         dont_fork = 1;
 341                                         break;
 342                                 case 'h':
 343                                         help(0);
 344                                         break;
 345                                 case 'i':
 346                                         config_set("global", "bind to", optarg);
 347                                         break;
 348                                 case 'P':
 349                                         strncpy(pidfile, optarg, FILENAME_MAX);
 350                                         pidfile[FILENAME_MAX] = '\0';
 351                                         break;
 352                                 case 'p':
 353                                         config_set("global", "default port", optarg);
 354                                         break;
 355                                 case 's':
 356                                         config_set("global", "host access prefix", optarg);
 357                                         break;
 358                                 case 't':
 359                                         config_set("global", "update every", optarg);
 360                                         break;
 361                                 case 'u':
 362                                         config_set("global", "run as user", optarg);
 363                                         break;
 364                                 case 'v':
 365                                         // TODO: Outsource version to makefile which can compute version from git.
 366                                         printf("netdata 1.2.1_master\n");
 367                                         return 0;
 368                                         break;
 369                                 case 'W':
 370                                         {
 371                                                 char* stacksize = "stacksize=";
 372                                                 char* debug_flags_string = "debug_flags=";
 373                                                 if(strcmp(optarg, "unittest") == 0) {
 374                                                         rrd_update_every = 1;
 375                                                         if(run_all_mockup_tests()) exit(1);
 376                                                         if(unit_test_storage()) exit(1);
 377                                                         fprintf(stderr, "\n\nALL TESTS PASSED\n\n");
 378                                                         exit(0);
 379                                                 } else if(strncmp(optarg, stacksize, strlen(stacksize)) == 0) {
 380                                                         optarg += strlen(stacksize);
 381                                                         config_set("global", "pthread stack size", optarg);
 382                                                 } else if(strncmp(optarg, debug_flags_string, strlen(debug_flags_string)) == 0) {
 383                                                         optarg += strlen(debug_flags_string);
 384                                                         config_set("global", "debug flags",  optarg);
 385                                                         debug_flags = strtoull(optarg, NULL, 0);
 386                                                 }
 387                                         }
 388                                         break;
 389                                 default: /* ? */
 390                                         help(1);
 391                                         break;
 392                         }
 393                 }
 394         }
 395
 396         if(!config_loaded) load_config(NULL, 0);
 397
 398         // prepare configuration environment variables for the plugins
 399         setenv("NETDATA_CONFIG_DIR" , config_get("global", "config directory"   , CONFIG_DIR) , 1);
 400         setenv("NETDATA_PLUGINS_DIR", config_get("global", "plugins directory"  , PLUGINS_DIR), 1);
 401         setenv("NETDATA_WEB_DIR"    , config_get("global", "web files directory", WEB_DIR)    , 1);
 402         setenv("NETDATA_CACHE_DIR"  , config_get("global", "cache directory"    , CACHE_DIR)  , 1);
 403         setenv("NETDATA_LIB_DIR"    , config_get("global", "lib directory"      , VARLIB_DIR) , 1);
 404         setenv("NETDATA_LOG_DIR"    , config_get("global", "log directory"      , LOG_DIR)    , 1);
 405         setenv("NETDATA_HOST_PREFIX", config_get("global", "host access prefix" , "")         , 1);
 406         setenv("HOME"               , config_get("global", "home directory"     , CACHE_DIR)  , 1);
 407
 408         // disable buffering for python plugins
 409         setenv("PYTHONUNBUFFERED", "1", 1);
 410
 411         // avoid flood calls to stat(/etc/localtime)
 412         // http://stackoverflow.com/questions/4554271/how-to-avoid-excessive-stat-etc-localtime-calls-in-strftime-on-linux
 413         setenv("TZ", ":/etc/localtime", 0);
 414
 415         {
 416                 char path[1024 + 1], *p = getenv("PATH");
 417                 if(!p) p = "/bin:/usr/bin";
 418                 snprintfz(path, 1024, "%s:%s", p, "/sbin:/usr/sbin:/usr/local/bin:/usr/local/sbin");
 419                 setenv("PATH", config_get("plugins", "PATH environment variable", path), 1);
 420         }
 421
 422         // cd to /tmp to avoid any plugins writing files at random places
 423         if(chdir("/tmp")) error("netdata: ERROR: Cannot cd to /tmp");
 424
 425         char *input_log_file = NULL;
 426         char *output_log_file = NULL;
 427         char *error_log_file = NULL;
 428         char *access_log_file = NULL;
 429         char *user = NULL;
 430         {
 431                 char *flags = config_get("global", "debug flags",  "0x00000000");
 432                 setenv("NETDATA_DEBUG_FLAGS", flags, 1);
 433
 434                 debug_flags = strtoull(flags, NULL, 0);
 435                 debug(D_OPTIONS, "Debug flags set to '0x%8llx'.", debug_flags);
 436
 437                 if(debug_flags != 0) {
 438                         struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
 439                         if(setrlimit(RLIMIT_CORE, &rl) != 0)
 440                                 info("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
 441                         prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
 442                 }
 443
 444                 // --------------------------------------------------------------------
 445
 446 #ifdef MADV_MERGEABLE
 447                 enable_ksm = config_get_boolean("global", "memory deduplication (ksm)", enable_ksm);
 448 #else
 449 #warning "Kernel memory deduplication (KSM) is not available"
 450 #endif
 451
 452                 // --------------------------------------------------------------------
 453
 454
 455                 global_host_prefix = config_get("global", "host access prefix", "");
 456                 setenv("NETDATA_HOST_PREFIX", global_host_prefix, 1);
 457
 458                 // --------------------------------------------------------------------
 459
 460                 output_log_file = config_get("global", "debug log", LOG_DIR "/debug.log");
 461                 if(strcmp(output_log_file, "syslog") == 0) {
 462                         output_log_syslog = 1;
 463                         output_log_file = NULL;
 464                 }
 465                 else if(strcmp(output_log_file, "none") == 0) {
 466                         output_log_syslog = 0;
 467                         output_log_file = NULL;
 468                 }
 469                 else output_log_syslog = 0;
 470
 471                 // --------------------------------------------------------------------
 472
 473                 error_log_file = config_get("global", "error log", LOG_DIR "/error.log");
 474                 if(strcmp(error_log_file, "syslog") == 0) {
 475                         error_log_syslog = 1;
 476                         error_log_file = NULL;
 477                 }
 478                 else if(strcmp(error_log_file, "none") == 0) {
 479                         error_log_syslog = 0;
 480                         error_log_file = NULL;
 481                         // optimization - do not even generate debug log entries
 482                 }
 483                 else error_log_syslog = 0;
 484
 485                 error_log_throttle_period = config_get_number("global", "errors flood protection period", error_log_throttle_period);
 486                 setenv("NETDATA_ERRORS_THROTTLE_PERIOD", config_get("global", "errors flood protection period"    , ""), 1);
 487
 488                 error_log_errors_per_period = (unsigned long)config_get_number("global", "errors to trigger flood protection", error_log_errors_per_period);
 489                 setenv("NETDATA_ERRORS_PER_PERIOD"     , config_get("global", "errors to trigger flood protection", ""), 1);
 490
 491                 // --------------------------------------------------------------------
 492
 493                 access_log_file = config_get("global", "access log", LOG_DIR "/access.log");
 494                 if(strcmp(access_log_file, "syslog") == 0) {
 495                         access_log_syslog = 1;
 496                         access_log_file = NULL;
 497                 }
 498                 else if(strcmp(access_log_file, "none") == 0) {
 499                         access_log_syslog = 0;
 500                         access_log_file = NULL;
 501                 }
 502                 else access_log_syslog = 0;
 503
 504                 // --------------------------------------------------------------------
 505
 506                 rrd_memory_mode = rrd_memory_mode_id(config_get("global", "memory mode", rrd_memory_mode_name(rrd_memory_mode)));
 507
 508                 // --------------------------------------------------------------------
 509
 510                 {
 511                         char hostnamebuf[HOSTNAME_MAX + 1];
 512                         if(gethostname(hostnamebuf, HOSTNAME_MAX) == -1)
 513                                 error("WARNING: Cannot get machine hostname.");
 514                         hostname = config_get("global", "hostname", hostnamebuf);
 515                         debug(D_OPTIONS, "hostname set to '%s'", hostname);
 516                 }
 517
 518                 // --------------------------------------------------------------------
 519
 520                 rrd_default_history_entries = (int) config_get_number("global", "history", RRD_DEFAULT_HISTORY_ENTRIES);
 521                 if(rrd_default_history_entries < 5 || rrd_default_history_entries > RRD_HISTORY_ENTRIES_MAX) {
 522                         info("Invalid save lines %d given. Defaulting to %d.", rrd_default_history_entries, RRD_DEFAULT_HISTORY_ENTRIES);
 523                         rrd_default_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
 524                 }
 525                 else {
 526                         debug(D_OPTIONS, "save lines set to %d.", rrd_default_history_entries);
 527                 }
 528
 529                 // --------------------------------------------------------------------
 530
 531                 rrd_update_every = (int) config_get_number("global", "update every", UPDATE_EVERY);
 532                 if(rrd_update_every < 1 || rrd_update_every > 600) {
 533                         info("Invalid update timer %d given. Defaulting to %d.", rrd_update_every, UPDATE_EVERY_MAX);
 534                         rrd_update_every = UPDATE_EVERY;
 535                 }
 536                 else debug(D_OPTIONS, "update timer set to %d.", rrd_update_every);
 537
 538                 // let the plugins know the min update_every
 539                 {
 540                         char buf[16];
 541                         snprintfz(buf, 15, "%d", rrd_update_every);
 542                         setenv("NETDATA_UPDATE_EVERY", buf, 1);
 543                 }
 544
 545                 // --------------------------------------------------------------------
 546
 547                 // block signals while initializing threads.
 548                 // this causes the threads to block signals.
 549                 sigset_t sigset;
 550                 sigfillset(&sigset);
 551
 552                 if(pthread_sigmask(SIG_BLOCK, &sigset, NULL) == -1) {
 553                         error("Could not block signals for threads");
 554                 }
 555
 556                 // Catch signals which we want to use to quit savely
 557                 struct sigaction sa;
 558                 sigemptyset(&sa.sa_mask);
 559                 sigaddset(&sa.sa_mask, SIGHUP);
 560                 sigaddset(&sa.sa_mask, SIGINT);
 561                 sigaddset(&sa.sa_mask, SIGTERM);
 562                 sa.sa_handler = sig_handler_exit;
 563                 sa.sa_flags = 0;
 564                 if(sigaction(SIGHUP, &sa, NULL) == -1) {
 565                         error("Failed to change signal handler for SIGHUP");
 566                 }
 567                 if(sigaction(SIGINT, &sa, NULL) == -1) {
 568                         error("Failed to change signal handler for SIGINT");
 569                 }
 570                 if(sigaction(SIGTERM, &sa, NULL) == -1) {
 571                         error("Failed to change signal handler for SIGTERM");
 572                 }
 573
 574                 // save database on SIGUSR1
 575                 sa.sa_handler = sig_handler_save;
 576                 if(sigaction(SIGUSR1, &sa, NULL) == -1) {
 577                         error("Failed to change signal handler for SIGUSR1");
 578                 }
 579
 580                 // Ignore SIGPIPE completely.
 581                 // INFO: If we add signals here we have to unblock them
 582                 // at popen.c when running a external plugin.
 583                 sa.sa_handler = SIG_IGN;
 584                 if(sigaction(SIGPIPE, &sa, NULL) == -1) {
 585                         error("Failed to change signal handler for SIGPIPE");
 586                 }
 587
 588                 // --------------------------------------------------------------------
 589
 590                 i = pthread_attr_init(&attr);
 591                 if(i != 0)
 592                         fatal("pthread_attr_init() failed with code %d.", i);
 593
 594                 i = pthread_attr_getstacksize(&attr, &stacksize);
 595                 if(i != 0)
 596                         fatal("pthread_attr_getstacksize() failed with code %d.", i);
 597                 else
 598                         debug(D_OPTIONS, "initial pthread stack size is %zu bytes", stacksize);
 599
 600                 wanted_stacksize = config_get_number("global", "pthread stack size", stacksize);
 601
 602                 // --------------------------------------------------------------------
 603
 604                 for (i = 0; static_threads[i].name != NULL ; i++) {
 605                         struct netdata_static_thread *st = &static_threads[i];
 606
 607                         if(st->config_name) st->enabled = config_get_boolean(st->config_section, st->config_name, st->enabled);
 608                         if(st->enabled && st->init_routine) st->init_routine();
 609                 }
 610
 611                 // --------------------------------------------------------------------
 612
 613                 // get the user we should run
 614                 // IMPORTANT: this is required before web_files_uid()
 615                 user = config_get("global", "run as user"    , (getuid() == 0)?NETDATA_USER:"");
 616
 617                 // IMPORTANT: these have to run once, while single threaded
 618                 web_files_uid(); // IMPORTANT: web_files_uid() before web_files_gid()
 619                 web_files_gid();
 620
 621                 // --------------------------------------------------------------------
 622
 623                 create_listen_sockets();
 624         }
 625
 626         // never become a problem
 627         if(nice(20) == -1) error("Cannot lower my CPU priority.");
 628
 629         if(become_daemon(dont_fork, 0, user, input_log_file, output_log_file, error_log_file, access_log_file, &access_fd, &stdaccess) == -1)
 630                 fatal("Cannot demonize myself.");
 631
 632 #ifdef NETDATA_INTERNAL_CHECKS
 633         if(debug_flags != 0) {
 634                 struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
 635                 if(setrlimit(RLIMIT_CORE, &rl) != 0)
 636                         info("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
 637                 prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
 638         }
 639 #endif /* NETDATA_INTERNAL_CHECKS */
 640
 641         if(output_log_syslog || error_log_syslog || access_log_syslog)
 642                 openlog("netdata", LOG_PID, LOG_DAEMON);
 643
 644         info("NetData started on pid %d", getpid());
 645
 646
 647         // ------------------------------------------------------------------------
 648         // get default pthread stack size
 649
 650         if(stacksize < wanted_stacksize) {
 651                 i = pthread_attr_setstacksize(&attr, wanted_stacksize);
 652                 if(i != 0)
 653                         fatal("pthread_attr_setstacksize() to %zu bytes, failed with code %d.", wanted_stacksize, i);
 654                 else
 655                         info("Successfully set pthread stacksize to %zu bytes", wanted_stacksize);
 656         }
 657
 658         // --------------------------------------------------------------------
 659         // initialize the registry
 660
 661         registry_init();
 662
 663         // ------------------------------------------------------------------------
 664         // spawn the threads
 665
 666         web_server_threading_selection();
 667
 668         for (i = 0; static_threads[i].name != NULL ; i++) {
 669                 struct netdata_static_thread *st = &static_threads[i];
 670
 671                 if(st->enabled) {
 672                         st->thread = malloc(sizeof(pthread_t));
 673                         if(!st->thread)
 674                                 fatal("Cannot allocate pthread_t memory");
 675
 676                         info("Starting thread %s.", st->name);
 677
 678                         if(pthread_create(st->thread, &attr, st->start_routine, NULL))
 679                                 error("failed to create new thread for %s.", st->name);
 680
 681                         else if(pthread_detach(*st->thread))
 682                                 error("Cannot request detach of newly created %s thread.", st->name);
 683                 }
 684                 else info("Not starting thread %s.", st->name);
 685         }
 686
 687         // ------------------------------------------------------------------------
 688         // block signals while initializing threads.
 689         sigset_t sigset;
 690         sigfillset(&sigset);
 691
 692         if(pthread_sigmask(SIG_UNBLOCK, &sigset, NULL) == -1) {
 693                 error("Could not unblock signals for threads");
 694         }
 695
 696         // Handle flags set in the signal handler.
 697         while(1) {
 698                 pause();
 699                 if(netdata_exit) {
 700                         info("Exit main loop of netdata.");
 701                         netdata_cleanup_and_exit(0);
 702                         exit(0);
 703                 }
 704         }
 705 }