src/main.c

   1 #ifdef HAVE_CONFIG_H
   2 #include <config.h>
   3 #endif
   4 #include <stdio.h>
   5 #include <stdlib.h>
   6 #include <unistd.h>
   7 #include <signal.h>
   8 #include <syslog.h>
   9 #include <pthread.h>
  10 #include <string.h>
  11 #include <errno.h>
  12 #include <sys/types.h>
  13 #include <sys/wait.h>
  14 #include <sys/time.h>
  15 #include <sys/resource.h>
  16 #include <sys/mman.h>
  17 #include <sys/prctl.h>
  18
  19 #include "common.h"
  20 #include "log.h"
  21 #include "daemon.h"
  22 #include "web_server.h"
  23 #include "popen.h"
  24 #include "appconfig.h"
  25 #include "web_client.h"
  26 #include "rrd.h"
  27 #include "rrd2json.h"
  28
  29 #include "unit_test.h"
  30
  31 #include "plugins_d.h"
  32 #include "plugin_idlejitter.h"
  33 #include "plugin_tc.h"
  34 #include "plugin_checks.h"
  35 #include "plugin_proc.h"
  36 #include "plugin_nfacct.h"
  37
  38 #include "main.h"
  39
  40 extern void *cgroups_main(void *ptr);
  41
  42 int netdata_exit = 0;
  43
  44 void netdata_cleanup_and_exit(int ret)
  45 {
  46         netdata_exit = 1;
  47         rrdset_save_all();
  48         // kill_childs();
  49
  50         // let it log a few more error messages
  51         error_log_limit_reset();
  52
  53         if(pidfd != -1) {
  54                 if(ftruncate(pidfd, 0) != 0)
  55                         error("Cannot truncate pidfile '%s'.", pidfile);
  56
  57                 close(pidfd);
  58                 pidfd = -1;
  59         }
  60
  61         if(pidfile[0]) {
  62                 if(unlink(pidfile) != 0)
  63                         error("Cannot unlink pidfile '%s'.", pidfile);
  64         }
  65
  66         info("NetData exiting. Bye bye...");
  67         exit(ret);
  68 }
  69
  70 struct netdata_static_thread {
  71         char *name;
  72
  73         char *config_section;
  74         char *config_name;
  75
  76         int enabled;
  77
  78         pthread_t *thread;
  79
  80         void (*init_routine) (void);
  81         void *(*start_routine) (void *);
  82 };
  83
  84 struct netdata_static_thread static_threads[] = {
  85         {"tc",                  "plugins",      "tc",                   1, NULL, NULL,  tc_main},
  86         {"idlejitter",  "plugins",      "idlejitter",   1, NULL, NULL,  cpuidlejitter_main},
  87         {"proc",                "plugins",      "proc",                 1, NULL, NULL,  proc_main},
  88         {"cgroups",             "plugins",      "cgroups",              1, NULL, NULL,  cgroups_main},
  89
  90 #ifdef INTERNAL_PLUGIN_NFACCT
  91         // nfacct requires root access
  92         // so, we build it as an external plugin with setuid to root
  93         {"nfacct",              "plugins",      "nfacct",               1, NULL, NULL,  nfacct_main},
  94 #endif
  95
  96         {"plugins.d",   NULL,           NULL,                   1, NULL, NULL,  pluginsd_main},
  97         {"check",               "plugins",      "checks",               0, NULL, NULL,  checks_main},
  98         {"web",                 NULL,           NULL,                   1, NULL, NULL,  socket_listen_main},
  99         {NULL,                  NULL,           NULL,                   0, NULL, NULL,  NULL}
 100 };
 101
 102 int killpid(pid_t pid, int sig)
 103 {
 104         int ret = -1;
 105         debug(D_EXIT, "Request to kill pid %d", pid);
 106
 107         errno = 0;
 108         if(kill(pid, 0) == -1) {
 109                 switch(errno) {
 110                         case ESRCH:
 111                                 error("Request to kill pid %d, but it is not running.", pid);
 112                                 break;
 113
 114                         case EPERM:
 115                                 error("Request to kill pid %d, but I do not have enough permissions.", pid);
 116                                 break;
 117
 118                         default:
 119                                 error("Request to kill pid %d, but I received an error.", pid);
 120                                 break;
 121                 }
 122         }
 123         else {
 124                 errno = 0;
 125
 126                 void (*old)(int);
 127                 old = signal(sig, SIG_IGN);
 128                 if(old == SIG_ERR) {
 129                         error("Cannot overwrite signal handler for signal %d", sig);
 130                         old = sig_handler;
 131                 }
 132
 133                 ret = kill(pid, sig);
 134
 135                 if(signal(sig, old) == SIG_ERR)
 136                         error("Cannot restore signal handler for signal %d", sig);
 137
 138                 if(ret == -1) {
 139                         switch(errno) {
 140                                 case ESRCH:
 141                                         error("Cannot kill pid %d, but it is not running.", pid);
 142                                         break;
 143
 144                                 case EPERM:
 145                                         error("Cannot kill pid %d, but I do not have enough permissions.", pid);
 146                                         break;
 147
 148                                 default:
 149                                         error("Cannot kill pid %d, but I received an error.", pid);
 150                                         break;
 151                         }
 152                 }
 153         }
 154
 155         return ret;
 156 }
 157
 158 void kill_childs()
 159 {
 160         siginfo_t info;
 161
 162         struct web_client *w;
 163         for(w = web_clients; w ; w = w->next) {
 164                 debug(D_EXIT, "Stopping web client %s", w->client_ip);
 165                 pthread_cancel(w->thread);
 166                 pthread_join(w->thread, NULL);
 167         }
 168
 169         int i;
 170         for (i = 0; static_threads[i].name != NULL ; i++) {
 171                 if(static_threads[i].thread) {
 172                         debug(D_EXIT, "Stopping %s thread", static_threads[i].name);
 173                         pthread_cancel(*static_threads[i].thread);
 174                         pthread_join(*static_threads[i].thread, NULL);
 175                         static_threads[i].thread = NULL;
 176                 }
 177         }
 178
 179         if(tc_child_pid) {
 180                 info("Killing tc-qos-helper procees");
 181                 if(killpid(tc_child_pid, SIGTERM) != -1)
 182                         waitid(P_PID, (id_t) tc_child_pid, &info, WEXITED);
 183         }
 184         tc_child_pid = 0;
 185
 186         struct plugind *cd;
 187         for(cd = pluginsd_root ; cd ; cd = cd->next) {
 188                 debug(D_EXIT, "Stopping %s plugin thread", cd->id);
 189                 pthread_cancel(cd->thread);
 190                 pthread_join(cd->thread, NULL);
 191
 192                 if(cd->pid && !cd->obsolete) {
 193                         debug(D_EXIT, "killing %s plugin process", cd->id);
 194                         if(killpid(cd->pid, SIGTERM) != -1)
 195                                 waitid(P_PID, (id_t) cd->pid, &info, WEXITED);
 196                 }
 197         }
 198
 199         // if, for any reason there is any child exited
 200         // catch it here
 201         waitid(P_PID, 0, &info, WEXITED|WNOHANG);
 202
 203         debug(D_EXIT, "All threads/childs stopped.");
 204 }
 205
 206
 207 int main(int argc, char **argv)
 208 {
 209         int i;
 210         int config_loaded = 0;
 211         int dont_fork = 0;
 212         size_t wanted_stacksize = 0, stacksize = 0;
 213         pthread_attr_t attr;
 214
 215         // global initialization
 216         get_HZ();
 217
 218         // set the name for logging
 219         program_name = "netdata";
 220
 221         // parse  the arguments
 222         for(i = 1; i < argc ; i++) {
 223                 if(strcmp(argv[i], "-c") == 0 && (i+1) < argc) {
 224                         if(load_config(argv[i+1], 1) != 1) {
 225                                 error("Cannot load configuration file %s.", argv[i+1]);
 226                                 exit(1);
 227                         }
 228                         else {
 229                                 debug(D_OPTIONS, "Configuration loaded from %s.", argv[i+1]);
 230                                 config_loaded = 1;
 231                         }
 232                         i++;
 233                 }
 234                 else if(strcmp(argv[i], "-df") == 0 && (i+1) < argc) { config_set("global", "debug flags",  argv[i+1]); debug_flags = strtoull(argv[i+1], NULL, 0); i++; }
 235                 else if(strcmp(argv[i], "-p")  == 0 && (i+1) < argc) { config_set("global", "port",         argv[i+1]); i++; }
 236                 else if(strcmp(argv[i], "-u")  == 0 && (i+1) < argc) { config_set("global", "run as user",  argv[i+1]); i++; }
 237                 else if(strcmp(argv[i], "-l")  == 0 && (i+1) < argc) { config_set("global", "history",      argv[i+1]); i++; }
 238                 else if(strcmp(argv[i], "-t")  == 0 && (i+1) < argc) { config_set("global", "update every", argv[i+1]); i++; }
 239                 else if(strcmp(argv[i], "-ch") == 0 && (i+1) < argc) { config_set("global", "host access prefix", argv[i+1]); i++; }
 240                 else if(strcmp(argv[i], "-stacksize") == 0 && (i+1) < argc) { config_set("global", "pthread stack size", argv[i+1]); i++; }
 241                 else if(strcmp(argv[i], "-nodaemon") == 0 || strcmp(argv[i], "-nd") == 0) dont_fork = 1;
 242                 else if(strcmp(argv[i], "-pidfile") == 0 && (i+1) < argc) {
 243                         i++;
 244                         strncpy(pidfile, argv[i], FILENAME_MAX);
 245                         pidfile[FILENAME_MAX] = '\0';
 246                 }
 247                 else if(strcmp(argv[i], "--unittest")  == 0) {
 248                         rrd_update_every = 1;
 249                         if(run_all_mockup_tests()) exit(1);
 250                         if(unit_test_storage()) exit(1);
 251                         fprintf(stderr, "\n\nALL TESTS PASSED\n\n");
 252                         exit(0);
 253                 }
 254                 else {
 255                         fprintf(stderr, "Cannot understand option '%s'.\n", argv[i]);
 256                         fprintf(stderr, "\nUSAGE: %s [-d] [-l LINES_TO_SAVE] [-u UPDATE_TIMER] [-p LISTEN_PORT] [-df debug flags].\n\n", argv[0]);
 257                         fprintf(stderr, "  -c CONFIG FILE the configuration file to load. Default: %s.\n", CONFIG_DIR "/" CONFIG_FILENAME);
 258                         fprintf(stderr, "  -l LINES_TO_SAVE can be from 5 to %d lines in JSON data. Default: %d.\n", RRD_HISTORY_ENTRIES_MAX, RRD_DEFAULT_HISTORY_ENTRIES);
 259                         fprintf(stderr, "  -t UPDATE_TIMER can be from 1 to %d seconds. Default: %d.\n", UPDATE_EVERY_MAX, UPDATE_EVERY);
 260                         fprintf(stderr, "  -p LISTEN_PORT can be from 1 to %d. Default: %d.\n", 65535, LISTEN_PORT);
 261                         fprintf(stderr, "  -u USERNAME can be any system username to run as. Default: none.\n");
 262                         fprintf(stderr, "  -ch path to access host /proc and /sys when running in a container. Default: empty.\n");
 263                         fprintf(stderr, "  -nd or -nodeamon to disable forking in the background. Default: unset.\n");
 264                         fprintf(stderr, "  -df FLAGS debug options. Default: 0x%08llx.\n", debug_flags);
 265                         fprintf(stderr, "  -stacksize BYTES to overwrite the pthread stack size.\n");
 266                         fprintf(stderr, "  -pidfile FILENAME to save a pid while running.\n");
 267                         exit(1);
 268                 }
 269         }
 270
 271         if(!config_loaded) load_config(NULL, 0);
 272
 273         // prepare configuration environment variables for the plugins
 274         setenv("NETDATA_CONFIG_DIR" , config_get("global", "config directory"   , CONFIG_DIR) , 1);
 275         setenv("NETDATA_PLUGINS_DIR", config_get("global", "plugins directory"  , PLUGINS_DIR), 1);
 276         setenv("NETDATA_WEB_DIR"    , config_get("global", "web files directory", WEB_DIR)    , 1);
 277         setenv("NETDATA_CACHE_DIR"  , config_get("global", "cache directory"    , CACHE_DIR)  , 1);
 278         setenv("NETDATA_LOG_DIR"    , config_get("global", "log directory"      , LOG_DIR)    , 1);
 279         setenv("NETDATA_HOST_PREFIX", config_get("global", "host access prefix" , "")         , 1);
 280         setenv("HOME"               , config_get("global", "home directory"     , CACHE_DIR)  , 1);
 281
 282         // avoid extended to stat(/etc/localtime)
 283         // http://stackoverflow.com/questions/4554271/how-to-avoid-excessive-stat-etc-localtime-calls-in-strftime-on-linux
 284         setenv("TZ", ":/etc/localtime", 0);
 285
 286         // cd to /tmp to avoid any plugins writing files at random places
 287         if(chdir("/tmp")) error("netdata: ERROR: Cannot cd to /tmp");
 288
 289         char *input_log_file = NULL;
 290         char *output_log_file = NULL;
 291         char *error_log_file = NULL;
 292         char *access_log_file = NULL;
 293         char *user = NULL;
 294         {
 295                 char buffer[1024];
 296
 297                 // --------------------------------------------------------------------
 298
 299                 sprintf(buffer, "0x%08llx", 0ULL);
 300                 char *flags = config_get("global", "debug flags", buffer);
 301                 setenv("NETDATA_DEBUG_FLAGS", flags, 1);
 302
 303                 debug_flags = strtoull(flags, NULL, 0);
 304                 debug(D_OPTIONS, "Debug flags set to '0x%8llx'.", debug_flags);
 305
 306                 if(debug_flags != 0) {
 307                         struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
 308                         if(setrlimit(RLIMIT_CORE, &rl) != 0)
 309                                 info("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
 310                         prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
 311                 }
 312
 313                 // --------------------------------------------------------------------
 314
 315 #ifdef MADV_MERGEABLE
 316                 enable_ksm = config_get_boolean("global", "memory deduplication (ksm)", enable_ksm);
 317 #else
 318 #warning "Kernel memory deduplication (KSM) is not available"
 319 #endif
 320
 321                 // --------------------------------------------------------------------
 322
 323
 324                 global_host_prefix = config_get("global", "host access prefix", "");
 325                 setenv("NETDATA_HOST_PREFIX", global_host_prefix, 1);
 326
 327                 // --------------------------------------------------------------------
 328
 329                 output_log_file = config_get("global", "debug log", LOG_DIR "/debug.log");
 330                 if(strcmp(output_log_file, "syslog") == 0) {
 331                         output_log_syslog = 1;
 332                         output_log_file = NULL;
 333                 }
 334                 else if(strcmp(output_log_file, "none") == 0) {
 335                         output_log_syslog = 0;
 336                         output_log_file = NULL;
 337                 }
 338                 else output_log_syslog = 0;
 339
 340                 // --------------------------------------------------------------------
 341
 342                 error_log_file = config_get("global", "error log", LOG_DIR "/error.log");
 343                 if(strcmp(error_log_file, "syslog") == 0) {
 344                         error_log_syslog = 1;
 345                         error_log_file = NULL;
 346                 }
 347                 else if(strcmp(error_log_file, "none") == 0) {
 348                         error_log_syslog = 0;
 349                         error_log_file = NULL;
 350                         // optimization - do not even generate debug log entries
 351                 }
 352                 else error_log_syslog = 0;
 353
 354                 error_log_throttle_period = config_get_number("global", "errors flood protection period", error_log_throttle_period);
 355                 setenv("NETDATA_ERRORS_THROTTLE_PERIOD", config_get("global", "errors flood protection period"    , ""), 1);
 356
 357                 error_log_errors_per_period = config_get_number("global", "errors to trigger flood protection", error_log_errors_per_period);
 358                 setenv("NETDATA_ERRORS_PER_PERIOD"     , config_get("global", "errors to trigger flood protection", ""), 1);
 359
 360                 // --------------------------------------------------------------------
 361
 362                 access_log_file = config_get("global", "access log", LOG_DIR "/access.log");
 363                 if(strcmp(access_log_file, "syslog") == 0) {
 364                         access_log_syslog = 1;
 365                         access_log_file = NULL;
 366                 }
 367                 else if(strcmp(access_log_file, "none") == 0) {
 368                         access_log_syslog = 0;
 369                         access_log_file = NULL;
 370                 }
 371                 else access_log_syslog = 0;
 372
 373                 // --------------------------------------------------------------------
 374
 375                 rrd_memory_mode = rrd_memory_mode_id(config_get("global", "memory mode", rrd_memory_mode_name(rrd_memory_mode)));
 376
 377                 // --------------------------------------------------------------------
 378
 379                 if(gethostname(buffer, HOSTNAME_MAX) == -1)
 380                         error("WARNING: Cannot get machine hostname.");
 381                 hostname = config_get("global", "hostname", buffer);
 382                 debug(D_OPTIONS, "hostname set to '%s'", hostname);
 383
 384                 // --------------------------------------------------------------------
 385
 386                 rrd_default_history_entries = (int) config_get_number("global", "history", RRD_DEFAULT_HISTORY_ENTRIES);
 387                 if(rrd_default_history_entries < 5 || rrd_default_history_entries > RRD_HISTORY_ENTRIES_MAX) {
 388                         info("Invalid save lines %d given. Defaulting to %d.", rrd_default_history_entries, RRD_DEFAULT_HISTORY_ENTRIES);
 389                         rrd_default_history_entries = RRD_DEFAULT_HISTORY_ENTRIES;
 390                 }
 391                 else {
 392                         debug(D_OPTIONS, "save lines set to %d.", rrd_default_history_entries);
 393                 }
 394
 395                 // --------------------------------------------------------------------
 396
 397                 rrd_update_every = (int) config_get_number("global", "update every", UPDATE_EVERY);
 398                 if(rrd_update_every < 1 || rrd_update_every > 600) {
 399                         info("Invalid update timer %d given. Defaulting to %d.", rrd_update_every, UPDATE_EVERY_MAX);
 400                         rrd_update_every = UPDATE_EVERY;
 401                 }
 402                 else debug(D_OPTIONS, "update timer set to %d.", rrd_update_every);
 403
 404                 // let the plugins know the min update_every
 405                 {
 406                         char buf[50];
 407                         snprintf(buf, 50, "%d", rrd_update_every);
 408                         setenv("NETDATA_UPDATE_EVERY", buf, 1);
 409                 }
 410
 411                 // --------------------------------------------------------------------
 412
 413                 i = pthread_attr_init(&attr);
 414                 if(i != 0)
 415                         fatal("pthread_attr_init() failed with code %d.", i);
 416
 417                 i = pthread_attr_getstacksize(&attr, &stacksize);
 418                 if(i != 0)
 419                         fatal("pthread_attr_getstacksize() failed with code %d.", i);
 420                 else
 421                         debug(D_OPTIONS, "initial pthread stack size is %zu bytes", stacksize);
 422
 423                 wanted_stacksize = config_get_number("global", "pthread stack size", stacksize);
 424
 425                 // --------------------------------------------------------------------
 426
 427                 for (i = 0; static_threads[i].name != NULL ; i++) {
 428                         struct netdata_static_thread *st = &static_threads[i];
 429
 430                         if(st->config_name) st->enabled = config_get_boolean(st->config_section, st->config_name, st->enabled);
 431                         if(st->enabled && st->init_routine) st->init_routine();
 432                 }
 433
 434                 // --------------------------------------------------------------------
 435
 436                 // get the user we should run
 437                 // IMPORTANT: this is required before web_files_uid()
 438                 user = config_get("global", "run as user"    , (getuid() == 0)?NETDATA_USER:"");
 439
 440                 // IMPORTANT: these have to run once, while single threaded
 441                 web_files_uid(); // IMPORTANT: web_files_uid() before web_files_gid()
 442                 web_files_gid();
 443
 444                 // --------------------------------------------------------------------
 445
 446                 listen_backlog = (int) config_get_number("global", "http port listen backlog", LISTEN_BACKLOG);
 447
 448                 listen_port = (int) config_get_number("global", "port", LISTEN_PORT);
 449                 if(listen_port < 1 || listen_port > 65535) {
 450                         info("Invalid listen port %d given. Defaulting to %d.", listen_port, LISTEN_PORT);
 451                         listen_port = LISTEN_PORT;
 452                 }
 453                 else debug(D_OPTIONS, "Listen port set to %d.", listen_port);
 454
 455                 int ip = 0;
 456                 char *ipv = config_get("global", "ip version", "any");
 457                 if(!strcmp(ipv, "any") || !strcmp(ipv, "both") || !strcmp(ipv, "all")) ip = 0;
 458                 else if(!strcmp(ipv, "ipv4") || !strcmp(ipv, "IPV4") || !strcmp(ipv, "IPv4") || !strcmp(ipv, "4")) ip = 4;
 459                 else if(!strcmp(ipv, "ipv6") || !strcmp(ipv, "IPV6") || !strcmp(ipv, "IPv6") || !strcmp(ipv, "6")) ip = 6;
 460                 else info("Cannot understand ip version '%s'. Assuming 'any'.", ipv);
 461
 462                 if(ip == 0 || ip == 6) listen_fd = create_listen_socket6(config_get("global", "bind socket to IP", "*"), listen_port, listen_backlog);
 463                 if(listen_fd < 0) {
 464                         listen_fd = create_listen_socket4(config_get("global", "bind socket to IP", "*"), listen_port, listen_backlog);
 465                         if(listen_fd >= 0 && ip != 4) info("Managed to open an IPv4 socket on port %d.", listen_port);
 466                 }
 467
 468                 if(listen_fd < 0) fatal("Cannot listen socket.");
 469         }
 470
 471         // never become a problem
 472         if(nice(20) == -1) error("Cannot lower my CPU priority.");
 473
 474         if(become_daemon(dont_fork, 0, user, input_log_file, output_log_file, error_log_file, access_log_file, &access_fd, &stdaccess) == -1) {
 475                 fatal("Cannot demonize myself.");
 476                 exit(1);
 477         }
 478
 479         if(debug_flags != 0) {
 480                 struct rlimit rl = { RLIM_INFINITY, RLIM_INFINITY };
 481                 if(setrlimit(RLIMIT_CORE, &rl) != 0)
 482                         info("Cannot request unlimited core dumps for debugging... Proceeding anyway...");
 483
 484                 prctl(PR_SET_DUMPABLE, 1, 0, 0, 0);
 485         }
 486
 487         if(output_log_syslog || error_log_syslog || access_log_syslog)
 488                 openlog("netdata", LOG_PID, LOG_DAEMON);
 489
 490         info("NetData started on pid %d", getpid());
 491
 492
 493         // catch all signals
 494         for (i = 1 ; i < 65 ;i++) {
 495                 switch(i) {
 496                         case SIGKILL: // not catchable
 497                         case SIGSTOP: // not catchable
 498                                 break;
 499
 500                         case SIGSEGV:
 501                         case SIGFPE:
 502                         case SIGCHLD:
 503                                 signal(i, SIG_DFL);
 504                                 break;
 505
 506                         default:
 507                                 signal(i,  sig_handler);
 508                                 break;
 509                 }
 510         }
 511
 512         // ------------------------------------------------------------------------
 513         // get default pthread stack size
 514
 515         if(stacksize < wanted_stacksize) {
 516                 i = pthread_attr_setstacksize(&attr, wanted_stacksize);
 517                 if(i != 0)
 518                         fatal("pthread_attr_setstacksize() to %zu bytes, failed with code %d.", wanted_stacksize, i);
 519                 else
 520                         info("Successfully set pthread stacksize to %zu bytes", wanted_stacksize);
 521         }
 522
 523         // ------------------------------------------------------------------------
 524         // spawn the threads
 525
 526         for (i = 0; static_threads[i].name != NULL ; i++) {
 527                 struct netdata_static_thread *st = &static_threads[i];
 528
 529                 if(st->enabled) {
 530                         st->thread = malloc(sizeof(pthread_t));
 531                         if(!st->thread)
 532                                 fatal("Cannot allocate pthread_t memory");
 533
 534                         info("Starting thread %s.", st->name);
 535
 536                         if(pthread_create(st->thread, &attr, st->start_routine, NULL))
 537                                 error("failed to create new thread for %s.", st->name);
 538
 539                         else if(pthread_detach(*st->thread))
 540                                 error("Cannot request detach of newly created %s thread.", st->name);
 541                 }
 542                 else info("Not starting thread %s.", st->name);
 543         }
 544
 545         // for future use - the main thread
 546         while(1) {
 547                 if(netdata_exit != 0) {
 548                         netdata_exit++;
 549
 550                         if(netdata_exit > 5) {
 551                                 netdata_cleanup_and_exit(0);
 552                                 exit(0);
 553                         }
 554                 }
 555                 sleep(2);
 556         }
 557
 558         exit(0);
 559 }