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(pidfd != -1) {
  53                 if(ftruncate(pidfd, 0) != 0)
  54                         error("Cannot truncate pidfile '%s'.", pidfile);
  55
  56                 close(pidfd);
  57                 pidfd = -1;
  58         }
  59
  60         if(pidfile[0]) {
  61                 if(unlink(pidfile) != 0)
  62                         error("Cannot unlink pidfile '%s'.", pidfile);
  63         }
  64
  65         info("NetData exiting. Bye bye...");
  66         exit(ret);
  67 }
  68
  69 struct netdata_static_thread {
  70         char *name;
  71
  72         char *config_section;
  73         char *config_name;
  74
  75         int enabled;
  76
  77         pthread_t *thread;
  78
  79         void (*init_routine) (void);
  80         void *(*start_routine) (void *);
  81 };
  82
  83 struct netdata_static_thread static_threads[] = {
  84         {"tc",                  "plugins",      "tc",                   1, NULL, NULL,  tc_main},
  85         {"idlejitter",  "plugins",      "idlejitter",   1, NULL, NULL,  cpuidlejitter_main},
  86         {"proc",                "plugins",      "proc",                 1, NULL, NULL,  proc_main},
  87         {"cgroups",             "plugins",      "cgroups",              1, NULL, NULL,  cgroups_main},
  88
  89 #ifdef INTERNAL_PLUGIN_NFACCT
  90         // nfacct requires root access
  91         // so, we build it as an external plugin with setuid to root
  92         {"nfacct",              "plugins",      "nfacct",               1, NULL, NULL,  nfacct_main},
  93 #endif
  94
  95         {"plugins.d",   NULL,           NULL,                   1, NULL, NULL,  pluginsd_main},
  96         {"check",               "plugins",      "checks",               0, NULL, NULL,  checks_main},
  97         {"web",                 NULL,           NULL,                   1, NULL, NULL,  socket_listen_main},
  98         {NULL,                  NULL,           NULL,                   0, NULL, NULL,  NULL}
  99 };
 100
 101 int killpid(pid_t pid, int sig)
 102 {
 103         int ret = -1;
 104         debug(D_EXIT, "Request to kill pid %d", pid);
 105
 106         errno = 0;
 107         if(kill(pid, 0) == -1) {
 108                 switch(errno) {
 109                         case ESRCH:
 110                                 error("Request to kill pid %d, but it is not running.", pid);
 111                                 break;
 112
 113                         case EPERM:
 114                                 error("Request to kill pid %d, but I do not have enough permissions.", pid);
 115                                 break;
 116
 117                         default:
 118                                 error("Request to kill pid %d, but I received an error.", pid);
 119                                 break;
 120                 }
 121         }
 122         else {
 123                 errno = 0;
 124                 ret = kill(pid, sig);
 125                 if(ret == -1) {
 126                         switch(errno) {
 127                                 case ESRCH:
 128                                         error("Cannot kill pid %d, but it is not running.", pid);
 129                                         break;
 130
 131                                 case EPERM:
 132                                         error("Cannot kill pid %d, but I do not have enough permissions.", pid);
 133                                         break;
 134
 135                                 default:
 136                                         error("Cannot kill pid %d, but I received an error.", pid);
 137                                         break;
 138                         }
 139                 }
 140         }
 141
 142         return ret;
 143 }
 144
 145 void kill_childs()
 146 {
 147         siginfo_t info;
 148
 149         struct web_client *w;
 150         for(w = web_clients; w ; w = w->next) {
 151                 debug(D_EXIT, "Stopping web client %s", w->client_ip);
 152                 pthread_cancel(w->thread);
 153                 pthread_join(w->thread, NULL);
 154         }
 155
 156         int i;
 157         for (i = 0; static_threads[i].name != NULL ; i++) {
 158                 if(static_threads[i].thread) {
 159                         debug(D_EXIT, "Stopping %s thread", static_threads[i].name);
 160                         pthread_cancel(*static_threads[i].thread);
 161                         pthread_join(*static_threads[i].thread, NULL);
 162                         static_threads[i].thread = NULL;
 163                 }
 164         }
 165
 166         if(tc_child_pid) {
 167                 info("Killing tc-qos-helper procees");
 168                 if(killpid(tc_child_pid, SIGTERM) != -1)
 169                         waitid(P_PID, (id_t) tc_child_pid, &info, WEXITED);
 170         }
 171         tc_child_pid = 0;
 172
 173         struct plugind *cd;
 174         for(cd = pluginsd_root ; cd ; cd = cd->next) {
 175                 debug(D_EXIT, "Stopping %s plugin thread", cd->id);
 176                 pthread_cancel(cd->thread);
 177                 pthread_join(cd->thread, NULL);
 178
 179                 if(cd->pid && !cd->obsolete) {
 180                         debug(D_EXIT, "killing %s plugin process", cd->id);
 181                         if(killpid(cd->pid, SIGTERM) != -1)
 182                                 waitid(P_PID, (id_t) cd->pid, &info, WEXITED);
 183                 }
 184         }
 185
 186         // if, for any reason there is any child exited
 187         // catch it here
 188         waitid(P_PID, 0, &info, WEXITED|WNOHANG);
 189
 190         debug(D_EXIT, "All threads/childs stopped.");
 191 }
 192
 193 struct option_def options[] = {
 194         // opt description                                                       arg name                     default value
 195         {'c', "Load alternate configuration file",                               "config_file",                          CONFIG_DIR "/" CONFIG_FILENAME},
 196         {'D', "Disable fork into background",                                    NULL,                                   NULL},
 197         {'h', "Display help message",                                            NULL,                                   NULL},
 198         {'P', "File to save a pid while running",                                "FILE",                                 NULL},
 199         {'i', "The IP address to listen to.",                                    "address",                              "All addresses"},
 200         {'p', "Port to listen. Can be from 1 to 65535.",                         "port_number",                          "19999"},
 201         {'s', "Path to access host /proc and /sys when running in a container.", "PATH",                                 NULL},
 202         {'t', "The frequency in seconds, for data collection. \
 203 Same as 'update every' config file option.",                                 "seconds",                              "1"},
 204         {'u', "System username to run as.",                                      "username",                             "netdata"},
 205         {'v', "Version of the program",                                          NULL,                                   NULL},
 206         {'W', "vendor options.",                                                 "stacksize=<size>|unittest|debug_flag", NULL},
 207 };
 208
 209 void help(int exitcode) {
 210         FILE *stream;
 211         if(exitcode == 0)
 212                 stream = stdout;
 213         else
 214                 stream = stderr;
 215
 216         int num_opts = sizeof(options) / sizeof(struct option_def);
 217         int i;
 218         int max_len_arg = 0;
 219
 220         // Compute maximum argument length
 221         for( i = 0; i < num_opts; i++ ) {
 222                 if(options[i].arg_name) {
 223                         int len_arg = strlen(options[i].arg_name);
 224                         if(len_arg > max_len_arg) max_len_arg = len_arg;
 225                 }
 226         }
 227
 228         fprintf(stream, "SYNOPSIS: netdata [options]\n");
 229         fprintf(stream, "\n");
 230         fprintf(stream, "Options:\n");
 231
 232         // Output options description.
 233         for( i = 0; i < num_opts; i++ ) {
 234                 fprintf(stream, "  -%c %-*s  %s", options[i].val, max_len_arg, options[i].arg_name ? options[i].arg_name : "", options[i].description);
 235                 if(options[i].default_value) {
 236                         fprintf(stream, " Default: %s\n", options[i].default_value);
 237                 } else {
 238                         fprintf(stream, "\n");
 239                 }
 240         }
 241
 242         fflush(stream);
 243         exit(exitcode);
 244 }
 245
 246 // TODO: Remove this function with the nix major release.
 247 void remove_option(int opt_index, int *argc, char **argv) {
 248         int i = opt_index;
 249         // remove the options.
 250         do {
 251                 *argc = *argc - 1;
 252                 for(i = opt_index; i < *argc; i++) {
 253                         argv[i] = argv[i+1];
 254                 }
 255                 i = opt_index;
 256         } while(argv[i][0] != '-' && opt_index >= *argc);
 257 }
 258
 259
 260 int main(int argc, char **argv)
 261 {
 262         int i;
 263         int config_loaded = 0;
 264         int dont_fork = 0;
 265         size_t wanted_stacksize = 0, stacksize = 0;
 266         pthread_attr_t attr;
 267
 268         // global initialization
 269         get_HZ();
 270
 271         // set the name for logging
 272         program_name = "netdata";
 273
 274         // parse command line.
 275
 276         // parse depercated options
 277         // TODO: Remove this block with the next major release.
 278         {
 279                 i = 1;
 280                 while(i < argc) {
 281                         if(strcmp(argv[i], "-pidfile") == 0 && (i+1) < argc) {
 282                                 strncpyz(pidfile, argv[i+1], FILENAME_MAX);
 283                                 fprintf(stderr, "%s: deprecate option -- %s -- please use -P instead.\n", argv[0], argv[i]);
 284                                 remove_option(i, &argc, argv);
 285                         }
 286                         else if(strcmp(argv[i], "-nodaemon") == 0 || strcmp(argv[i], "-nd") == 0) {
 287                                 dont_fork = 1;
 288                                 fprintf(stderr, "%s: deprecate option -- %s -- please use -D instead.\n ", argv[0], argv[i]);
 289                                 remove_option(i, &argc, argv);
 290                         }
 291                         else if(strcmp(argv[i], "-ch") == 0 && (i+1) < argc) {
 292                                 config_set("global", "host access prefix", argv[i+1]);
 293                                 fprintf(stderr, "%s: deprecate option -- %s -- please use -s instead.\n", argv[0], argv[i]);
 294                                 remove_option(i, &argc, argv);
 295                         }
 296                         else if(strcmp(argv[i], "-l") == 0 && (i+1) < argc) {
 297                                 config_set("global", "history", argv[i+1]);
 298                                 fprintf(stderr, "%s: deprecate option -- %s -- This option will be rmoved with V2.*.\n", argv[0], argv[i]);
 299                                 remove_option(i, &argc, argv);
 300                         }
 301                         else i++;
 302                 }
 303         }
 304
 305         // parse options
 306         {
 307                 int num_opts = sizeof(options) / sizeof(struct option_def);
 308                 char optstring[(num_opts * 2) + 1];
 309
 310                 int string_i = 0;
 311                 for( i = 0; i < num_opts; i++ ) {
 312                         optstring[string_i] = options[i].val;
 313                         string_i++;
 314                         if(options[i].arg_name) {
 315                                 optstring[string_i] = ':';
 316                                 string_i++;
 317                         }
 318                 }
 319
 320                 int opt;
 321                 while( (opt = getopt(argc, argv, optstring)) != -1 ) {
 322                         switch(opt) {
 323                                 case 'c':
 324                                         if(load_config(optarg, 1) != 1) {
 325                                                 error("Cannot load configuration file %s.", optarg);
 326                                                 exit(1);
 327                                         }
 328                                         else {
 329                                                 debug(D_OPTIONS, "Configuration loaded from %s.", optarg);
 330                                                 config_loaded = 1;
 331                                         }
 332                                         break;
 333                                 case 'D':
 334                                         dont_fork = 1;
 335                                         break;
 336                                 case 'h':
 337                                         help(0);
 338                                         break;
 339                                 case 'i':
 340                                         config_set("global", "bind socket to IP", optarg);
 341                                         break;
 342                                 case 'P':
 343                                         strncpy(pidfile, optarg, FILENAME_MAX);
 344                                         pidfile[FILENAME_MAX] = '\0';
 345                                         break;
 346                                 case 'p':
 347                                         config_set("global", "port", optarg);
 348                                         break;
 349                                 case 's':
 350                                         config_set("global", "host access prefix", optarg);
 351                                         break;
 352                                 case 't':
 353                                         config_set("global", "update every", optarg);
 354                                         break;
 355                                 case 'u':
 356                                         config_set("global", "run as user", optarg);
 357                                         break;
 358                                 case 'v':
 359                                         // TODO: Outsource version to makefile which can compute version from git.
 360                                         printf("netdata 1.1.0\n");
 361                                         return 0;
 362                                         break;
 363                                 case 'W':
 364                                         {
 365                                                 char* stacksize = "stacksize=";
 366                                                 char* debug_flags_string = "debug_flags=";
 367                                                 if(strcmp(optarg, "unittest") == 0) {
 368                                                         rrd_update_every = 1;
 369                                                         if(run_all_mockup_tests()) exit(1);
 370                                                         if(unit_test_storage()) exit(1);
 371                                                         fprintf(stderr, "\n\nALL TESTS PASSED\n\n");
 372                                                         exit(0);
 373                                                 } else if(strncmp(optarg, stacksize, strlen(stacksize)) == 0) {
 374                                                         optarg += strlen(stacksize);
 375                                                         config_set("global", "pthread stack size", optarg);
 376                                                 } else if(strncmp(optarg, debug_flags_string, strlen(debug_flags_string)) == 0) {
 377                                                         optarg += strlen(debug_flags_string);
 378                                                         config_set("global", "debug flags",  optarg);
 379                                                         debug_flags = strtoull(optarg, NULL, 0);
 380                                                 }
 381                                         }
 382                                         break;
 383                                 default: /* ? */
 384                                         help(1);
 385                                         break;
 386                         }
 387                 }
 388         }
 389
 390         if(!config_loaded) load_config(NULL, 0);
 391
 392         // prepare configuration environment variables for the plugins
 393         setenv("NETDATA_CONFIG_DIR" , config_get("global", "config directory"   , CONFIG_DIR) , 1);
 394         setenv("NETDATA_PLUGINS_DIR", config_get("global", "plugins directory"  , PLUGINS_DIR), 1);
 395         setenv("NETDATA_WEB_DIR"    , config_get("global", "web files directory", WEB_DIR)    , 1);
 396         setenv("NETDATA_CACHE_DIR"  , config_get("global", "cache directory"    , CACHE_DIR)  , 1);
 397         setenv("NETDATA_LIB_DIR"    , config_get("global", "lib directory"      , VARLIB_DIR) , 1);
 398         setenv("NETDATA_LOG_DIR"    , config_get("global", "log directory"      , LOG_DIR)    , 1);
 399         setenv("NETDATA_HOST_PREFIX", config_get("global", "host access prefix" , "")         , 1);
 400         setenv("HOME"               , config_get("global", "home directory"     , CACHE_DIR)  , 1);
 401
 402         // avoid extended to stat(/etc/localtime)
 403         // http://stackoverflow.com/questions/4554271/how-to-avoid-excessive-stat-etc-localtime-calls-in-strftime-on-linux
 404         setenv("TZ", ":/etc/localtime", 0);
 405
 406         // cd to /tmp to avoid any plugins writing files at random places
 407         if(chdir("/tmp")) error("netdata: ERROR: Cannot cd to /tmp");
 408
 409         char *input_log_file = NULL;
 410         char *output_log_file = NULL;
 411         char *error_log_file = NULL;
 412         char *access_log_file = NULL;
 413         char *user = NULL;
 414         {
 415                 char buffer[1024];
 416
 417                 // --------------------------------------------------------------------
 418
 419                 sprintf(buffer, "0x%08llx", 0ULL);
 420                 char *flags = config_get("global", "debug flags", buffer);
 421                 setenv("NETDATA_DEBUG_FLAGS", flags, 1);
 422
 423                 debug_flags = strtoull(flags, NULL, 0);
 424                 debug(D_OPTIONS, "Debug flags set to '0x%8llx'.", debug_flags);
 425
 426                 if(debug_flags != 0) {
 427                         struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
 428                         if(setrlimit(RLIMIT_CORE, &rl) != 0)
 429                                 info("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
 430                         prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
 431                 }
 432
 433                 // --------------------------------------------------------------------
 434
 435 #ifdef MADV_MERGEABLE
 436                 enable_ksm = config_get_boolean("global", "memory deduplication (ksm)", enable_ksm);
 437 #else
 438 #warning "Kernel memory deduplication (KSM) is not available"
 439 #endif
 440
 441                 // --------------------------------------------------------------------
 442
 443
 444                 global_host_prefix = config_get("global", "host access prefix", "");
 445                 setenv("NETDATA_HOST_PREFIX", global_host_prefix, 1);
 446
 447                 // --------------------------------------------------------------------
 448
 449                 output_log_file = config_get("global", "debug log", LOG_DIR "/debug.log");
 450                 if(strcmp(output_log_file, "syslog") == 0) {
 451                         output_log_syslog = 1;
 452                         output_log_file = NULL;
 453                 }
 454                 else if(strcmp(output_log_file, "none") == 0) {
 455                         output_log_syslog = 0;
 456                         output_log_file = NULL;
 457                 }
 458                 else output_log_syslog = 0;
 459
 460                 // --------------------------------------------------------------------
 461
 462                 error_log_file = config_get("global", "error log", LOG_DIR "/error.log");
 463                 if(strcmp(error_log_file, "syslog") == 0) {
 464                         error_log_syslog = 1;
 465                         error_log_file = NULL;
 466                 }
 467                 else if(strcmp(error_log_file, "none") == 0) {
 468                         error_log_syslog = 0;
 469                         error_log_file = NULL;
 470                         // optimization - do not even generate debug log entries
 471                 }
 472                 else error_log_syslog = 0;
 473
 474                 error_log_throttle_period = config_get_number("global", "errors flood protection period", error_log_throttle_period);
 475                 setenv("NETDATA_ERRORS_THROTTLE_PERIOD", config_get("global", "errors flood protection period"    , ""), 1);
 476
 477                 error_log_errors_per_period = config_get_number("global", "errors to trigger flood protection", error_log_errors_per_period);
 478                 setenv("NETDATA_ERRORS_PER_PERIOD"     , config_get("global", "errors to trigger flood protection", ""), 1);
 479
 480                 // --------------------------------------------------------------------
 481
 482                 access_log_file = config_get("global", "access log", LOG_DIR "/access.log");
 483                 if(strcmp(access_log_file, "syslog") == 0) {
 484                         access_log_syslog = 1;
 485                         access_log_file = NULL;
 486                 }
 487                 else if(strcmp(access_log_file, "none") == 0) {
 488                         access_log_syslog = 0;
 489                         access_log_file = NULL;
 490                 }
 491                 else access_log_syslog = 0;
 492
 493                 // --------------------------------------------------------------------
 494
 495                 rrd_memory_mode = rrd_memory_mode_id(config_get("global", "memory mode", rrd_memory_mode_name(rrd_memory_mode)));
 496
 497                 // --------------------------------------------------------------------
 498
 499                 if(gethostname(buffer, HOSTNAME_MAX) == -1)
 500                         error("WARNING: Cannot get machine hostname.");
 501                 hostname = config_get("global", "hostname", buffer);
 502                 debug(D_OPTIONS, "hostname set to '%s'", hostname);
 503
 504                 // --------------------------------------------------------------------
 505
 506                 rrd_default_history_entries = (int) config_get_number("global", "history", RRD_DEFAULT_HISTORY_ENTRIES);
 507                 if(rrd_default_history_entries < 5 || rrd_default_history_entries > RRD_HISTORY_ENTRIES_MAX) {
 508                         info("Invalid save lines %d given. Defaulting to %d.", rrd_default_history_entries, RRD_DEFAULT_HISTORY_ENTRIES);
 509                         rrd_default_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
 510                 }
 511                 else {
 512                         debug(D_OPTIONS, "save lines set to %d.", rrd_default_history_entries);
 513                 }
 514
 515                 // --------------------------------------------------------------------
 516
 517                 rrd_update_every = (int) config_get_number("global", "update every", UPDATE_EVERY);
 518                 if(rrd_update_every < 1 || rrd_update_every > 600) {
 519                         info("Invalid update timer %d given. Defaulting to %d.", rrd_update_every, UPDATE_EVERY_MAX);
 520                         rrd_update_every = UPDATE_EVERY;
 521                 }
 522                 else debug(D_OPTIONS, "update timer set to %d.", rrd_update_every);
 523
 524                 // let the plugins know the min update_every
 525                 {
 526                         char buf[51];
 527                         snprintfz(buf, 50, "%d", rrd_update_every);
 528                         setenv("NETDATA_UPDATE_EVERY", buf, 1);
 529                 }
 530
 531                 // --------------------------------------------------------------------
 532
 533                 // block signals while initializing threads.
 534                 // this causes the threads to block signals.
 535                 sigset_t sigset;
 536                 sigfillset(&sigset);
 537
 538                 if(pthread_sigmask(SIG_BLOCK, &sigset, NULL) == -1) {
 539                         error("Could not block signals for threads");
 540                 }
 541
 542                 // Catch signals which we want to use to quit savely
 543                 struct sigaction sa;
 544                 sigemptyset(&sa.sa_mask);
 545                 sigaddset(&sa.sa_mask, SIGHUP);
 546                 sigaddset(&sa.sa_mask, SIGINT);
 547                 sigaddset(&sa.sa_mask, SIGTERM);
 548                 sa.sa_handler = sig_handler;
 549                 sa.sa_flags = 0;
 550                 if(sigaction(SIGHUP, &sa, NULL) == -1) {
 551                         error("Failed to change signal handler for SIGHUP");
 552                 }
 553                 if(sigaction(SIGINT, &sa, NULL) == -1) {
 554                         error("Failed to change signal handler for SIGINT");
 555                 }
 556                 if(sigaction(SIGTERM, &sa, NULL) == -1) {
 557                         error("Failed to change signal handler for SIGTERM");
 558                 }
 559                 // Ignore SIGPIPE completely.
 560                 // INFO: If we add signals here we have to unblock them
 561                 // at popen.c when running a external plugin.
 562                 sa.sa_handler = SIG_IGN;
 563                 if(sigaction(SIGPIPE, &sa, NULL) == -1) {
 564                         error("Failed to change signal handler for SIGTERM");
 565                 }
 566
 567                 // --------------------------------------------------------------------
 568
 569                 i = pthread_attr_init(&attr);
 570                 if(i != 0)
 571                         fatal("pthread_attr_init() failed with code %d.", i);
 572
 573                 i = pthread_attr_getstacksize(&attr, &stacksize);
 574                 if(i != 0)
 575                         fatal("pthread_attr_getstacksize() failed with code %d.", i);
 576                 else
 577                         debug(D_OPTIONS, "initial pthread stack size is %zu bytes", stacksize);
 578
 579                 wanted_stacksize = config_get_number("global", "pthread stack size", stacksize);
 580
 581                 // --------------------------------------------------------------------
 582
 583                 for (i = 0; static_threads[i].name != NULL ; i++) {
 584                         struct netdata_static_thread *st = &static_threads[i];
 585
 586                         if(st->config_name) st->enabled = config_get_boolean(st->config_section, st->config_name, st->enabled);
 587                         if(st->enabled && st->init_routine) st->init_routine();
 588                 }
 589
 590                 // --------------------------------------------------------------------
 591
 592                 // get the user we should run
 593                 // IMPORTANT: this is required before web_files_uid()
 594                 user = config_get("global", "run as user"    , (getuid() == 0)?NETDATA_USER:"");
 595
 596                 // IMPORTANT: these have to run once, while single threaded
 597                 web_files_uid(); // IMPORTANT: web_files_uid() before web_files_gid()
 598                 web_files_gid();
 599
 600                 // --------------------------------------------------------------------
 601
 602                 listen_backlog = (int) config_get_number("global", "http port listen backlog", LISTEN_BACKLOG);
 603
 604                 listen_port = (int) config_get_number("global", "port", LISTEN_PORT);
 605                 if(listen_port < 1 || listen_port > 65535) {
 606                         info("Invalid listen port %d given. Defaulting to %d.", listen_port, LISTEN_PORT);
 607                         listen_port = LISTEN_PORT;
 608                 }
 609                 else debug(D_OPTIONS, "Listen port set to %d.", listen_port);
 610
 611                 int ip = 0;
 612                 char *ipv = config_get("global", "ip version", "any");
 613                 if(!strcmp(ipv, "any") || !strcmp(ipv, "both") || !strcmp(ipv, "all")) ip = 0;
 614                 else if(!strcmp(ipv, "ipv4") || !strcmp(ipv, "IPV4") || !strcmp(ipv, "IPv4") || !strcmp(ipv, "4")) ip = 4;
 615                 else if(!strcmp(ipv, "ipv6") || !strcmp(ipv, "IPV6") || !strcmp(ipv, "IPv6") || !strcmp(ipv, "6")) ip = 6;
 616                 else info("Cannot understand ip version '%s'. Assuming 'any'.", ipv);
 617
 618                 if(ip == 0 || ip == 6) listen_fd = create_listen_socket6(config_get("global", "bind socket to IP", "*"), listen_port, listen_backlog);
 619                 if(listen_fd < 0) {
 620                         listen_fd = create_listen_socket4(config_get("global", "bind socket to IP", "*"), listen_port, listen_backlog);
 621                         if(listen_fd >= 0 && ip != 4) info("Managed to open an IPv4 socket on port %d.", listen_port);
 622                 }
 623
 624                 if(listen_fd < 0) fatal("Cannot listen socket.");
 625         }
 626
 627         // never become a problem
 628         if(nice(20) == -1) error("Cannot lower my CPU priority.");
 629
 630         if(become_daemon(dont_fork, 0, user, input_log_file, output_log_file, error_log_file, access_log_file, &access_fd, &stdaccess) == -1)
 631                 fatal("Cannot demonize myself.");
 632
 633 #ifdef NETDATA_INTERNAL_CHECKS
 634         if(debug_flags != 0) {
 635                 struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
 636                 if(setrlimit(RLIMIT_CORE, &rl) != 0)
 637                         info("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
 638                 prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
 639         }
 640 #endif /* NETDATA_INTERNAL_CHECKS */
 641
 642         if(output_log_syslog || error_log_syslog || access_log_syslog)
 643                 openlog("netdata", LOG_PID, LOG_DAEMON);
 644
 645         info("NetData started on pid %d", getpid());
 646
 647
 648         // ------------------------------------------------------------------------
 649         // get default pthread stack size
 650
 651         if(stacksize < wanted_stacksize) {
 652                 i = pthread_attr_setstacksize(&attr, wanted_stacksize);
 653                 if(i != 0)
 654                         fatal("pthread_attr_setstacksize() to %zu bytes, failed with code %d.", wanted_stacksize, i);
 655                 else
 656                         info("Successfully set pthread stacksize to %zu bytes", wanted_stacksize);
 657         }
 658
 659         // --------------------------------------------------------------------
 660         // initialize the registry
 661
 662         registry_init();
 663
 664         // ------------------------------------------------------------------------
 665         // spawn the threads
 666
 667         for (i = 0; static_threads[i].name != NULL ; i++) {
 668                 struct netdata_static_thread *st = &static_threads[i];
 669
 670                 if(st->enabled) {
 671                         st->thread = malloc(sizeof(pthread_t));
 672                         if(!st->thread)
 673                                 fatal("Cannot allocate pthread_t memory");
 674
 675                         info("Starting thread %s.", st->name);
 676
 677                         if(pthread_create(st->thread, &attr, st->start_routine, NULL))
 678                                 error("failed to create new thread for %s.", st->name);
 679
 680                         else if(pthread_detach(*st->thread))
 681                                 error("Cannot request detach of newly created %s thread.", st->name);
 682                 }
 683                 else info("Not starting thread %s.", st->name);
 684         }
 685
 686         // ------------------------------------------------------------------------
 687         // block signals while initializing threads.
 688         sigset_t sigset;
 689         sigfillset(&sigset);
 690
 691         if(pthread_sigmask(SIG_UNBLOCK, &sigset, NULL) == -1) {
 692                 error("Could not unblock signals for threads");
 693         }
 694
 695         // Handle flags set in the signal handler.
 696         while(1) {
 697                 pause();
 698                 if(netdata_exit) {
 699                         info("Exit main loop of netdata.");
 700                         netdata_cleanup_and_exit(0);
 701                         exit(0);
 702                 }
 703         }
 704 }