text: 
  /*
   * Copyright (C) Igor Sysoev
   */
  
  
  #include <ngx_config.h>
  #include <ngx_core.h>
  #include <ngx_event.h>
  
  
  static void ngx_destroy_cycle_pools(ngx_conf_t *conf);
  static ngx_int_t ngx_cmp_sockaddr(struct sockaddr *sa1, struct sockaddr *sa2);
  static ngx_int_t ngx_init_zone_pool(ngx_cycle_t *cycle,
      ngx_shm_zone_t *shm_zone);
  static ngx_int_t ngx_test_lockfile(u_char *file, ngx_log_t *log);
  static void ngx_clean_old_cycles(ngx_event_t *ev);
  
  
  volatile ngx_cycle_t  *ngx_cycle;
  ngx_array_t            ngx_old_cycles;
  
  static ngx_pool_t     *ngx_temp_pool;
  static ngx_event_t     ngx_cleaner_event;
  
  ngx_uint_t             ngx_test_config;
  
  #if (NGX_THREADS)
  ngx_tls_key_t          ngx_core_tls_key;
  #endif
  
  
  /* STUB NAME */
  static ngx_connection_t  dumb;
  /* STUB */
  
  static ngx_str_t  error_log = ngx_string(NGX_ERROR_LOG_PATH);
  
  
  ngx_cycle_t *
  ngx_init_cycle(ngx_cycle_t *old_cycle)
  {
      void                *rv;
      char               **senv, **env;
      ngx_uint_t           i, n;
      ngx_log_t           *log;
      ngx_time_t          *tp;
      ngx_conf_t           conf;
      ngx_pool_t          *pool;
      ngx_cycle_t         *cycle, **old;
      ngx_shm_zone_t      *shm_zone, *oshm_zone;
      ngx_list_part_t     *part, *opart;
      ngx_open_file_t     *file;
      ngx_listening_t     *ls, *nls;
      ngx_core_conf_t     *ccf, *old_ccf;
      ngx_core_module_t   *module;
      char                 hostname[NGX_MAXHOSTNAMELEN];
  
      ngx_timezone_update();
  
      /* force localtime update with a new timezone */
  
      tp = ngx_timeofday();
      tp->sec = 0;
  
      ngx_time_update(0, 0);
  
  
      log = old_cycle->log;
  
      pool = ngx_create_pool(NGX_CYCLE_POOL_SIZE, log);
      if (pool == NULL) {
          return NULL;
      }
      pool->log = log;
  
      cycle = ngx_pcalloc(pool, sizeof(ngx_cycle_t));
      if (cycle == NULL) {
          ngx_destroy_pool(pool);
          return NULL;
      }
  
      cycle->pool = pool;
      cycle->log = log;
      cycle->new_log.log_level = NGX_LOG_ERR;
      cycle->old_cycle = old_cycle;
  
      cycle->conf_prefix.len = old_cycle->conf_prefix.len;
      cycle->conf_prefix.data = ngx_pstrdup(pool, &old_cycle->conf_prefix);
      if (cycle->conf_prefix.data == NULL) {
          ngx_destroy_pool(pool);
          return NULL;
      }
  
      cycle->prefix.len = old_cycle->prefix.len;
      cycle->prefix.data = ngx_pstrdup(pool, &old_cycle->prefix);
      if (cycle->prefix.data == NULL) {
          ngx_destroy_pool(pool);
          return NULL;
      }
  
      cycle->conf_file.len = old_cycle->conf_file.len;
      cycle->conf_file.data = ngx_pnalloc(pool, old_cycle->conf_file.len + 1);
      if (cycle->conf_file.data == NULL) {
          ngx_destroy_pool(pool);
          return NULL;
      }
      ngx_cpystrn(cycle->conf_file.data, old_cycle->conf_file.data,
                  old_cycle->conf_file.len + 1);
  
      cycle->conf_param.len = old_cycle->conf_param.len;
      cycle->conf_param.data = ngx_pstrdup(pool, &old_cycle->conf_param);
      if (cycle->conf_param.data == NULL) {
          ngx_destroy_pool(pool);
          return NULL;
      }
  
  
      n = old_cycle->pathes.nelts ? old_cycle->pathes.nelts : 10;
  
      cycle->pathes.elts = ngx_pcalloc(pool, n * sizeof(ngx_path_t *));
      if (cycle->pathes.elts == NULL) {
          ngx_destroy_pool(pool);
          return NULL;
      }
  
      cycle->pathes.nelts = 0;
      cycle->pathes.size = sizeof(ngx_path_t *);
      cycle->pathes.nalloc = n;
      cycle->pathes.pool = pool;
  
  
      if (old_cycle->open_files.part.nelts) {
          n = old_cycle->open_files.part.nelts;
          for (part = old_cycle->open_files.part.next; part; part = part->next) {
              n += part->nelts;
          }
  
      } else {
          n = 20;
      }
  
      if (ngx_list_init(&cycle->open_files, pool, n, sizeof(ngx_open_file_t))
          != NGX_OK)
      {
          ngx_destroy_pool(pool);
          return NULL;
      }
  
  
      if (old_cycle->shared_memory.part.nelts) {
          n = old_cycle->shared_memory.part.nelts;
          for (part = old_cycle->shared_memory.part.next; part; part = part->next)
          {
              n += part->nelts;
          }
  
      } else {
          n = 1;
      }
  
      if (ngx_list_init(&cycle->shared_memory, pool, n, sizeof(ngx_shm_zone_t))
          != NGX_OK)
      {
          ngx_destroy_pool(pool);
          return NULL;
      }
  
      n = old_cycle->listening.nelts ? old_cycle->listening.nelts : 10;
  
      cycle->listening.elts = ngx_pcalloc(pool, n * sizeof(ngx_listening_t));
      if (cycle->listening.elts == NULL) {
          ngx_destroy_pool(pool);
          return NULL;
      }
  
      cycle->listening.nelts = 0;
      cycle->listening.size = sizeof(ngx_listening_t);
      cycle->listening.nalloc = n;
      cycle->listening.pool = pool;
  
  
      cycle->conf_ctx = ngx_pcalloc(pool, ngx_max_module * sizeof(void *));
      if (cycle->conf_ctx == NULL) {
          ngx_destroy_pool(pool);
          return NULL;
      }
  
  
      if (gethostname(hostname, NGX_MAXHOSTNAMELEN) == -1) {
          ngx_log_error(NGX_LOG_EMERG, log, ngx_errno, "gethostname() failed");
          ngx_destroy_pool(pool);
          return NULL;
      }
  
      /* on Linux gethostname() silently truncates name that does not fit */
  
      hostname[NGX_MAXHOSTNAMELEN - 1] = '\0';
      cycle->hostname.len = ngx_strlen(hostname);
  
      cycle->hostname.data = ngx_pnalloc(pool, cycle->hostname.len);
      if (cycle->hostname.data == NULL) {
          ngx_destroy_pool(pool);
          return NULL;
      }
  
      ngx_memcpy(cycle->hostname.data, hostname, cycle->hostname.len);
  
  
      for (i = 0; ngx_modules[i]; i++) {
          if (ngx_modules[i]->type != NGX_CORE_MODULE) {
              continue;
          }
  
          module = ngx_modules[i]->ctx;
  
          if (module->create_conf) {
              rv = module->create_conf(cycle);
              if (rv == NULL) {
                  ngx_destroy_pool(pool);
                  return NULL;
              }
              cycle->conf_ctx[ngx_modules[i]->index] = rv;
          }
      }
  
  
      senv = environ;
  
  
      ngx_memzero(&conf, sizeof(ngx_conf_t));
      /* STUB: init array ? */
      conf.args = ngx_array_create(pool, 10, sizeof(ngx_str_t));
      if (conf.args == NULL) {
          ngx_destroy_pool(pool);
          return NULL;
      }
  
      conf.temp_pool = ngx_create_pool(NGX_CYCLE_POOL_SIZE, log);
      if (conf.temp_pool == NULL) {
          ngx_destroy_pool(pool);
          return NULL;
      }
  
  
      conf.ctx = cycle->conf_ctx;
      conf.cycle = cycle;
      conf.pool = pool;
      conf.log = log;
      conf.module_type = NGX_CORE_MODULE;
      conf.cmd_type = NGX_MAIN_CONF;
  
  #if 0
      log->log_level = NGX_LOG_DEBUG_ALL;
  #endif
  
      if (ngx_conf_param(&conf) != NGX_CONF_OK) {
          environ = senv;
          ngx_destroy_cycle_pools(&conf);
          return NULL;
      }
  
      if (ngx_conf_parse(&conf, &cycle->conf_file) != NGX_CONF_OK) {
          environ = senv;
          ngx_destroy_cycle_pools(&conf);
          return NULL;
      }
  
      if (ngx_test_config) {
          ngx_log_stderr(0, "the configuration file %s syntax is ok",
                         cycle->conf_file.data);
      }
  
      for (i = 0; ngx_modules[i]; i++) {
          if (ngx_modules[i]->type != NGX_CORE_MODULE) {
              continue;
          }
  
          module = ngx_modules[i]->ctx;
  
          if (module->init_conf) {
              if (module->init_conf(cycle, cycle->conf_ctx[ngx_modules[i]->index])
                  == NGX_CONF_ERROR)
              {
                  environ = senv;
                  ngx_destroy_cycle_pools(&conf);
                  return NULL;
              }
          }
      }
  
      if (ngx_process == NGX_PROCESS_SIGNALLER) {
          return cycle;
      }
  
      ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
  
      if (ngx_test_config) {
  
          if (ngx_create_pidfile(&ccf->pid, log) != NGX_OK) {
              goto failed;
          }
  
      } else if (!ngx_is_init_cycle(old_cycle)) {
  
          /*
           * we do not create the pid file in the first ngx_init_cycle() call
           * because we need to write the demonized process pid
           */
  
          old_ccf = (ngx_core_conf_t *) ngx_get_conf(old_cycle->conf_ctx,
                                                     ngx_core_module);
          if (ccf->pid.len != old_ccf->pid.len
              || ngx_strcmp(ccf->pid.data, old_ccf->pid.data) != 0)
          {
              /* new pid file name */
  
              if (ngx_create_pidfile(&ccf->pid, log) != NGX_OK) {
                  goto failed;
              }
  
              ngx_delete_pidfile(old_cycle);
          }
      }
  
  
      if (ngx_test_lockfile(cycle->lock_file.data, log) != NGX_OK) {
          goto failed;
      }
  
  
      if (ngx_create_pathes(cycle, ccf->user) != NGX_OK) {
          goto failed;
      }
  
  
      if (cycle->new_log.file == NULL) {
          cycle->new_log.file = ngx_conf_open_file(cycle, &error_log);
          if (cycle->new_log.file == NULL) {
              goto failed;
          }
      }
  
      /* open the new files */
  
      part = &cycle->open_files.part;
      file = part->elts;
  
      for (i = 0; /* void */ ; i++) {
  
          if (i >= part->nelts) {
              if (part->next == NULL) {
                  break;
              }
              part = part->next;
              file = part->elts;
              i = 0;
          }
  
          if (file[i].name.len == 0) {
              continue;
          }
  
          file[i].fd = ngx_open_file(file[i].name.data,
                                     NGX_FILE_APPEND,
                                     NGX_FILE_CREATE_OR_OPEN,
                                     NGX_FILE_DEFAULT_ACCESS);
  
          ngx_log_debug3(NGX_LOG_DEBUG_CORE, log, 0,
                         "log: %p %d \"%s\"",
                         &file[i], file[i].fd, file[i].name.data);
  
          if (file[i].fd == NGX_INVALID_FILE) {
              ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                            ngx_open_file_n " \"%s\" failed",
                            file[i].name.data);
              goto failed;
          }
  
  #if !(NGX_WIN32)
          if (fcntl(file[i].fd, F_SETFD, FD_CLOEXEC) == -1) {
              ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                            "fcntl(FD_CLOEXEC) \"%s\" failed",
                            file[i].name.data);
              goto failed;
          }
  #endif
      }
  
      cycle->log = &cycle->new_log;
      pool->log = &cycle->new_log;
  
  
      /* create shared memory */
  
      part = &cycle->shared_memory.part;
      shm_zone = part->elts;
  
      for (i = 0; /* void */ ; i++) {
  
          if (i >= part->nelts) {
              if (part->next == NULL) {
                  break;
              }
              part = part->next;
              shm_zone = part->elts;
              i = 0;
          }
  
          if (shm_zone[i].shm.size == 0) {
              ngx_log_error(NGX_LOG_EMERG, log, 0,
                            "zero size shared memory zone \"%V\"",
                            &shm_zone[i].shm.name);
              goto failed;
          }
  
          if (shm_zone[i].init == NULL) {
              /* unused shared zone */
              continue;
          }
  
          shm_zone[i].shm.log = cycle->log;
  
          opart = &old_cycle->shared_memory.part;
          oshm_zone = opart->elts;
  
          for (n = 0; /* void */ ; n++) {
  
              if (n >= opart->nelts) {
                  if (opart->next == NULL) {
                      break;
                  }
                  opart = opart->next;
                  oshm_zone = opart->elts;
                  n = 0;
              }
  
              if (shm_zone[i].shm.name.len != oshm_zone[n].shm.name.len) {
                  continue;
              }
  
              if (ngx_strncmp(shm_zone[i].shm.name.data,
                              oshm_zone[n].shm.name.data,
                              shm_zone[i].shm.name.len)
                  != 0)
              {
                  continue;
              }
  
              if (shm_zone[i].shm.size == oshm_zone[n].shm.size) {
                  shm_zone[i].shm.addr = oshm_zone[n].shm.addr;
  
                  if (shm_zone[i].init(&shm_zone[i], oshm_zone[n].data)
                      != NGX_OK)
                  {
                      goto failed;
                  }
  
                  goto shm_zone_found;
              }
  
              ngx_shm_free(&oshm_zone[n].shm);
  
              break;
          }
  
          if (ngx_shm_alloc(&shm_zone[i].shm) != NGX_OK) {
              goto failed;
          }
  
          if (ngx_init_zone_pool(cycle, &shm_zone[i]) != NGX_OK) {
              goto failed;
          }
  
          if (shm_zone[i].init(&shm_zone[i], NULL) != NGX_OK) {
              goto failed;
          }
  
      shm_zone_found:
  
          continue;
      }
  
  
      /* handle the listening sockets */
  
      if (old_cycle->listening.nelts) {
          ls = old_cycle->listening.elts;
          for (i = 0; i < old_cycle->listening.nelts; i++) {
              ls[i].remain = 0;
          }
  
          nls = cycle->listening.elts;
          for (n = 0; n < cycle->listening.nelts; n++) {
  
              for (i = 0; i < old_cycle->listening.nelts; i++) {
                  if (ls[i].ignore) {
                      continue;
                  }
  
                  if (ngx_cmp_sockaddr(nls[n].sockaddr, ls[i].sockaddr) == NGX_OK)
                  {
                      nls[n].fd = ls[i].fd;
                      nls[n].previous = &ls[i];
                      ls[i].remain = 1;
  
                      if (ls[n].backlog != nls[i].backlog) {
                          nls[n].listen = 1;
                      }
  
  #if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
  
                      /*
                       * FreeBSD, except the most recent versions,
                       * could not remove accept filter
                       */
                      nls[n].deferred_accept = ls[i].deferred_accept;
  
                      if (ls[i].accept_filter && nls[n].accept_filter) {
                          if (ngx_strcmp(ls[i].accept_filter,
                                         nls[n].accept_filter)
                              != 0)
                          {
                              nls[n].delete_deferred = 1;
                              nls[n].add_deferred = 1;
                          }
  
                      } else if (ls[i].accept_filter) {
                          nls[n].delete_deferred = 1;
  
                      } else if (nls[n].accept_filter) {
                          nls[n].add_deferred = 1;
                      }
  #endif
  
  #if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
  
                      if (ls[n].deferred_accept && !nls[n].deferred_accept) {
                          nls[n].delete_deferred = 1;
  
                      } else if (ls[i].deferred_accept != nls[n].deferred_accept)
                      {
                          nls[n].add_deferred = 1;
                      }
  #endif
                      break;
                  }
              }
  
              if (nls[n].fd == -1) {
                  nls[n].open = 1;
              }
          }
  
      } else {
          ls = cycle->listening.elts;
          for (i = 0; i < cycle->listening.nelts; i++) {
              ls[i].open = 1;
  #if (NGX_HAVE_DEFERRED_ACCEPT && defined SO_ACCEPTFILTER)
              if (ls[i].accept_filter) {
                  ls[i].add_deferred = 1;
              }
  #endif
  #if (NGX_HAVE_DEFERRED_ACCEPT && defined TCP_DEFER_ACCEPT)
              if (ls[i].deferred_accept) {
                  ls[i].add_deferred = 1;
              }
  #endif
          }
      }
  
      if (ngx_open_listening_sockets(cycle) != NGX_OK) {
          goto failed;
      }
  
      if (!ngx_test_config) {
          ngx_configure_listening_sockets(cycle);
      }
  
  
      /* commit the new cycle configuration */
  
      if (!ngx_use_stderr && cycle->log->file->fd != ngx_stderr) {
  
          if (ngx_set_stderr(cycle->log->file->fd) == NGX_FILE_ERROR) {
              ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
                            ngx_set_stderr_n " failed");
          }
      }
  
      pool->log = cycle->log;
  
      for (i = 0; ngx_modules[i]; i++) {
          if (ngx_modules[i]->init_module) {
              if (ngx_modules[i]->init_module(cycle) != NGX_OK) {
                  /* fatal */
                  exit(1);
              }
          }
      }
  
  
      /* close and delete stuff that lefts from an old cycle */
  
      /* free the unnecessary shared memory */
  
      opart = &old_cycle->shared_memory.part;
      oshm_zone = opart->elts;
  
      for (i = 0; /* void */ ; i++) {
  
          if (i >= opart->nelts) {
              if (opart->next == NULL) {
                  goto old_shm_zone_done;
              }
              opart = opart->next;
              oshm_zone = opart->elts;
              i = 0;
          }
  
          part = &cycle->shared_memory.part;
          shm_zone = part->elts;
  
          for (n = 0; /* void */ ; n++) {
  
              if (n >= part->nelts) {
                  if (part->next == NULL) {
                      break;
                  }
                  part = part->next;
                  shm_zone = part->elts;
                  n = 0;
              }
  
              if (oshm_zone[i].shm.name.len == shm_zone[n].shm.name.len
                  && ngx_strncmp(oshm_zone[i].shm.name.data,
                                 shm_zone[n].shm.name.data,
                                 oshm_zone[i].shm.name.len)
                  == 0)
              {
                  goto live_shm_zone;
              }
          }
  
          ngx_shm_free(&oshm_zone[i].shm);
  
      live_shm_zone:
  
          continue;
      }
  
  old_shm_zone_done:
  
  
      /* close the unnecessary listening sockets */
  
      ls = old_cycle->listening.elts;
      for (i = 0; i < old_cycle->listening.nelts; i++) {
  
          if (ls[i].remain || ls[i].fd == -1) {
              continue;
          }
  
          if (ngx_close_socket(ls[i].fd) == -1) {
              ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                            ngx_close_socket_n " listening socket on %V failed",
                            &ls[i].addr_text);
          }
      }
  
  
      /* close the unnecessary open files */
  
      part = &old_cycle->open_files.part;
      file = part->elts;
  
      for (i = 0; /* void */ ; i++) {
  
          if (i >= part->nelts) {
              if (part->next == NULL) {
                  break;
              }
              part = part->next;
              file = part->elts;
              i = 0;
          }
  
          if (file[i].fd == NGX_INVALID_FILE || file[i].fd == ngx_stderr) {
              continue;
          }
  
          if (ngx_close_file(file[i].fd) == NGX_FILE_ERROR) {
              ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                            ngx_close_file_n " \"%s\" failed",
                            file[i].name.data);
          }
      }
  
      ngx_destroy_pool(conf.temp_pool);
  
      if (ngx_process == NGX_PROCESS_MASTER || ngx_is_init_cycle(old_cycle)) {
  
          /*
           * perl_destruct() frees environ, if it is not the same as it was at
           * perl_construct() time, therefore we save the previous cycle
           * environment before ngx_conf_parse() where it will be changed.
           */
  
          env = environ;
          environ = senv;
  
          ngx_destroy_pool(old_cycle->pool);
          cycle->old_cycle = NULL;
  
          environ = env;
  
          return cycle;
      }
  
  
      if (ngx_temp_pool == NULL) {
          ngx_temp_pool = ngx_create_pool(128, cycle->log);
          if (ngx_temp_pool == NULL) {
              ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
                            "can not create ngx_temp_pool");
              exit(1);
          }
  
          n = 10;
          ngx_old_cycles.elts = ngx_pcalloc(ngx_temp_pool,
                                            n * sizeof(ngx_cycle_t *));
          if (ngx_old_cycles.elts == NULL) {
              exit(1);
          }
          ngx_old_cycles.nelts = 0;
          ngx_old_cycles.size = sizeof(ngx_cycle_t *);
          ngx_old_cycles.nalloc = n;
          ngx_old_cycles.pool = ngx_temp_pool;
  
          ngx_cleaner_event.handler = ngx_clean_old_cycles;
          ngx_cleaner_event.log = cycle->log;
          ngx_cleaner_event.data = &dumb;
          dumb.fd = (ngx_socket_t) -1;
      }
  
      ngx_temp_pool->log = cycle->log;
  
      old = ngx_array_push(&ngx_old_cycles);
      if (old == NULL) {
          exit(1);
      }
      *old = old_cycle;
  
      if (!ngx_cleaner_event.timer_set) {
          ngx_add_timer(&ngx_cleaner_event, 30000);
          ngx_cleaner_event.timer_set = 1;
      }
  
      return cycle;
  
  
  failed:
  
      if (!ngx_is_init_cycle(old_cycle)) {
          old_ccf = (ngx_core_conf_t *) ngx_get_conf(old_cycle->conf_ctx,
                                                     ngx_core_module);
          if (old_ccf->environment) {
              environ = old_ccf->environment;
          }
      }
  
      /* rollback the new cycle configuration */
  
      part = &cycle->open_files.part;
      file = part->elts;
  
      for (i = 0; /* void */ ; i++) {
  
          if (i >= part->nelts) {
              if (part->next == NULL) {
                  break;
              }
              part = part->next;
              file = part->elts;
              i = 0;
          }
  
          if (file[i].fd == NGX_INVALID_FILE || file[i].fd == ngx_stderr) {
              continue;
          }
  
          if (ngx_close_file(file[i].fd) == NGX_FILE_ERROR) {
              ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                            ngx_close_file_n " \"%s\" failed",
                            file[i].name.data);
          }
      }
  
      if (ngx_test_config) {
          ngx_destroy_cycle_pools(&conf);
          return NULL;
      }
  
      ls = cycle->listening.elts;
      for (i = 0; i < cycle->listening.nelts; i++) {
          if (ls[i].fd == -1 || !ls[i].open) {
              continue;
          }
  
          if (ngx_close_socket(ls[i].fd) == -1) {
              ngx_log_error(NGX_LOG_EMERG, log, ngx_socket_errno,
                            ngx_close_socket_n " %V failed",
                            &ls[i].addr_text);
          }
      }
  
      ngx_destroy_cycle_pools(&conf);
  
      return NULL;
  }
  
  
  static void
  ngx_destroy_cycle_pools(ngx_conf_t *conf)
  {
      ngx_destroy_pool(conf->temp_pool);
      ngx_destroy_pool(conf->pool);
  }
  
  
  static ngx_int_t
  ngx_cmp_sockaddr(struct sockaddr *sa1, struct sockaddr *sa2)
  {
      struct sockaddr_in   *sin1, *sin2;
  #if (NGX_HAVE_INET6)
      struct sockaddr_in6  *sin61, *sin62;
  #endif
  
      if (sa1->sa_family != sa2->sa_family) {
          return NGX_DECLINED;
      }
  
      switch (sa1->sa_family) {
  
  #if (NGX_HAVE_INET6)
      case AF_INET6:
          sin61 = (struct sockaddr_in6 *) sa1;
          sin62 = (struct sockaddr_in6 *) sa2;
  
          if (sin61->sin6_port != sin61->sin6_port) {
              return NGX_DECLINED;
          }
  
          if (ngx_memcmp(&sin61->sin6_addr, &sin62->sin6_addr, 16) != 0) {
              return NGX_DECLINED;
          }
  
          break;
  #endif
  
      default: /* AF_INET */
  
          sin1 = (struct sockaddr_in *) sa1;
          sin2 = (struct sockaddr_in *) sa2;
  
          if (sin1->sin_port != sin2->sin_port) {
              return NGX_DECLINED;
          }
  
          if (sin1->sin_addr.s_addr != sin2->sin_addr.s_addr) {
              return NGX_DECLINED;
          }
  
          break;
      }
  
      return NGX_OK;
  }
  
  
  static ngx_int_t
  ngx_init_zone_pool(ngx_cycle_t *cycle, ngx_shm_zone_t *zn)
  {
      u_char           *file;
      ngx_slab_pool_t  *sp;
  
      sp = (ngx_slab_pool_t *) zn->shm.addr;
  
      if (zn->shm.exists) {
  
          if (sp == sp->addr) {
              return NGX_OK;
          }
  
          ngx_log_error(NGX_LOG_EMERG, cycle->log, 0,
                        "shared zone \"%V\" has no equal addresses: %p vs %p",
                        &zn->shm.name, sp->addr, sp);
          return NGX_ERROR;
      }
  
      sp->end = zn->shm.addr + zn->shm.size;
      sp->min_shift = 3;
      sp->addr = zn->shm.addr;
  
  #if (NGX_HAVE_ATOMIC_OPS)
  
      file = NULL;
  
  #else
  
      file = ngx_pnalloc(cycle->pool, cycle->lock_file.len + zn->shm.name.len);
      if (file == NULL) {
          return NGX_ERROR;
      }
  
      (void) ngx_sprintf(file, "%V%V%Z", &cycle->lock_file, &zn->shm.name);
  
  #endif
  
      if (ngx_shmtx_create(&sp->mutex, (void *) &sp->lock, file) != NGX_OK) {
          return NGX_ERROR;
      }
  
      ngx_slab_init(sp);
  
      return NGX_OK;
  }
  
  
  ngx_int_t
  ngx_create_pidfile(ngx_str_t *name, ngx_log_t *log)
  {
      size_t      len;
      ngx_uint_t  create;
      ngx_file_t  file;
      u_char      pid[NGX_INT64_LEN + 2];
  
      if (ngx_process > NGX_PROCESS_MASTER) {
          return NGX_OK;
      }
  
      ngx_memzero(&file, sizeof(ngx_file_t));
  
      file.name = *name;
      file.log = log;
  
      create = ngx_test_config ? NGX_FILE_CREATE_OR_OPEN : NGX_FILE_TRUNCATE;
  
      file.fd = ngx_open_file(file.name.data, NGX_FILE_RDWR,
                              create, NGX_FILE_DEFAULT_ACCESS);
  
      if (file.fd == NGX_INVALID_FILE) {
          ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                        ngx_open_file_n " \"%s\" failed", file.name.data);
          return NGX_ERROR;
      }
  
      if (!ngx_test_config) {
          len = ngx_snprintf(pid, NGX_INT64_LEN + 2, "%P%N", ngx_pid) - pid;
  
          if (ngx_write_file(&file, pid, len, 0) == NGX_ERROR) {
              return NGX_ERROR;
          }
      }
  
      if (ngx_close_file(file.fd) == NGX_FILE_ERROR) {
          ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
                        ngx_close_file_n " \"%s\" failed", file.name.data);
      }
  
      return NGX_OK;
  }
  
  
  void
  ngx_delete_pidfile(ngx_cycle_t *cycle)
  {
      u_char           *name;
      ngx_core_conf_t  *ccf;
  
      ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
  
      name = ngx_new_binary ? ccf->oldpid.data : ccf->pid.data;
  
      if (ngx_delete_file(name) == NGX_FILE_ERROR) {
          ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
                        ngx_delete_file_n " \"%s\" failed", name);
      }
  }
  
  
  ngx_int_t
  ngx_signal_process(ngx_cycle_t *cycle, char *sig)
  {
      ssize_t           n;
      ngx_int_t         pid;
      ngx_file_t        file;
      ngx_core_conf_t  *ccf;
      u_char            buf[NGX_INT64_LEN + 2];
  
      ngx_log_error(NGX_LOG_NOTICE, cycle->log, 0, "signal process started");
  
      ccf = (ngx_core_conf_t *) ngx_get_conf(cycle->conf_ctx, ngx_core_module);
  
      file.name = ccf->pid;
      file.log = cycle->log;
  
      file.fd = ngx_open_file(file.name.data, NGX_FILE_RDONLY,
                              NGX_FILE_OPEN, NGX_FILE_DEFAULT_ACCESS);
  
      if (file.fd == NGX_INVALID_FILE) {
          ngx_log_error(NGX_LOG_ERR, cycle->log, ngx_errno,
                        ngx_open_file_n " \"%s\" failed", file.name.data);
          return 1;
      }
  
      n = ngx_read_file(&file, buf, NGX_INT64_LEN + 2, 0);
  
      if (ngx_close_file(file.fd) == NGX_FILE_ERROR) {
          ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
                        ngx_close_file_n " \"%s\" failed", file.name.data);
      }
  
      if (n == NGX_ERROR) {
          return 1;
      }
  
      while (n-- && (buf[n] == CR || buf[n] == LF)) { /* void */ }
  
      pid = ngx_atoi(buf, ++n);
  
      if (pid == NGX_ERROR) {
          ngx_log_error(NGX_LOG_ERR, cycle->log, 0,
                        "invalid PID number \"%*s\" in \"%s\"",
                        n, buf, file.name.data);
          return 1;
      }
  
      return ngx_os_signal_process(cycle, sig, pid);
  
  }
  
  
  static ngx_int_t
  ngx_test_lockfile(u_char *file, ngx_log_t *log)
  {
  #if !(NGX_HAVE_ATOMIC_OPS)
      ngx_fd_t  fd;
  
      fd = ngx_open_file(file, NGX_FILE_RDWR, NGX_FILE_CREATE_OR_OPEN,
                         NGX_FILE_DEFAULT_ACCESS);
  
      if (fd == NGX_INVALID_FILE) {
          ngx_log_error(NGX_LOG_EMERG, log, ngx_errno,
                        ngx_open_file_n " \"%s\" failed", file);
          return NGX_ERROR;
      }
  
      if (ngx_close_file(fd) == NGX_FILE_ERROR) {
          ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
                        ngx_close_file_n " \"%s\" failed", file);
      }
  
      if (ngx_delete_file(file) == NGX_FILE_ERROR) {
          ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
                        ngx_delete_file_n " \"%s\" failed", file);
      }
  
  #endif
  
      return NGX_OK;
  }
  
  
  void
  ngx_reopen_files(ngx_cycle_t *cycle, ngx_uid_t user)
  {
      ssize_t           n, len;
      ngx_fd_t          fd;
      ngx_uint_t        i;
      ngx_list_part_t  *part;
      ngx_open_file_t  *file;
  
      part = &cycle->open_files.part;
      file = part->elts;
  
      for (i = 0; /* void */ ; i++) {
  
          if (i >= part->nelts) {
              if (part->next == NULL) {
                  break;
              }
              part = part->next;
              file = part->elts;
              i = 0;
          }
  
          if (file[i].name.len == 0) {
              continue;
          }
  
          len = file[i].pos - file[i].buffer;
  
          if (file[i].buffer && len != 0) {
  
              n = ngx_write_fd(file[i].fd, file[i].buffer, len);
  
              if (n == NGX_FILE_ERROR) {
                  ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
                                ngx_write_fd_n " to \"%s\" failed",
                                file[i].name.data);
  
              } else if (n != len) {
                  ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
                            ngx_write_fd_n " to \"%s\" was incomplete: %z of %uz",
                            file[i].name.data, n, len);
              }
  
              file[i].pos = file[i].buffer;
          }
  
          fd = ngx_open_file(file[i].name.data, NGX_FILE_APPEND,
                             NGX_FILE_CREATE_OR_OPEN, NGX_FILE_DEFAULT_ACCESS);
  
          ngx_log_debug3(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
                         "reopen file \"%s\", old:%d new:%d",
                         file[i].name.data, file[i].fd, fd);
  
          if (fd == NGX_INVALID_FILE) {
              ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                            ngx_open_file_n " \"%s\" failed", file[i].name.data);
              continue;
          }
  
  #if !(NGX_WIN32)
          if (user != (ngx_uid_t) NGX_CONF_UNSET_UINT) {
              ngx_file_info_t  fi;
  
              if (ngx_file_info((const char *) file[i].name.data, &fi)
                  == NGX_FILE_ERROR)
              {
                  ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                                ngx_file_info_n " \"%s\" failed",
                                file[i].name.data);
  
                  if (ngx_close_file(fd) == NGX_FILE_ERROR) {
                      ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                                    ngx_close_file_n " \"%s\" failed",
                                    file[i].name.data);
                  }
              }
  
              if (fi.st_uid != user) {
                  if (chown((const char *) file[i].name.data, user, -1) == -1) {
                      ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                                    "chown(\"%s\", %d) failed",
                                    file[i].name.data, user);
  
                      if (ngx_close_file(fd) == NGX_FILE_ERROR) {
                          ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                                        ngx_close_file_n " \"%s\" failed",
                                        file[i].name.data);
                      }
                  }
              }
  
              if ((fi.st_mode & (S_IRUSR|S_IWUSR)) != (S_IRUSR|S_IWUSR)) {
  
                  fi.st_mode |= (S_IRUSR|S_IWUSR);
  
                  if (chmod((const char *) file[i].name.data, fi.st_mode) == -1) {
                      ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                                    "chmod() \"%s\" failed", file[i].name.data);
  
                      if (ngx_close_file(fd) == NGX_FILE_ERROR) {
                          ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                                        ngx_close_file_n " \"%s\" failed",
                                        file[i].name.data);
                      }
                  }
              }
          }
  
          if (fcntl(fd, F_SETFD, FD_CLOEXEC) == -1) {
              ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                            "fcntl(FD_CLOEXEC) \"%s\" failed",
                            file[i].name.data);
  
              if (ngx_close_file(fd) == NGX_FILE_ERROR) {
                  ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                                ngx_close_file_n " \"%s\" failed",
                                file[i].name.data);
              }
  
              continue;
          }
  #endif
  
          if (ngx_close_file(file[i].fd) == NGX_FILE_ERROR) {
              ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                            ngx_close_file_n " \"%s\" failed",
                            file[i].name.data);
          }
  
          file[i].fd = fd;
      }
  
  #if !(NGX_WIN32)
  
      if (cycle->log->file->fd != STDERR_FILENO) {
          if (dup2(cycle->log->file->fd, STDERR_FILENO) == -1) {
              ngx_log_error(NGX_LOG_EMERG, cycle->log, ngx_errno,
                            "dup2(STDERR) failed");
          }
      }
  
  #endif
  }
  
  
  ngx_shm_zone_t *
  ngx_shared_memory_add(ngx_conf_t *cf, ngx_str_t *name, size_t size, void *tag)
  {
      ngx_uint_t        i;
      ngx_shm_zone_t   *shm_zone;
      ngx_list_part_t  *part;
  
      part = &cf->cycle->shared_memory.part;
      shm_zone = part->elts;
  
      for (i = 0; /* void */ ; i++) {
  
          if (i >= part->nelts) {
              if (part->next == NULL) {
                  break;
              }
              part = part->next;
              shm_zone = part->elts;
              i = 0;
          }
  
          if (name->len != shm_zone[i].shm.name.len) {
              continue;
          }
  
          if (ngx_strncmp(name->data, shm_zone[i].shm.name.data, name->len)
              != 0)
          {
              continue;
          }
  
          if (size && size != shm_zone[i].shm.size) {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                              "the size %uz of shared memory zone \"%V\" "
                              "conflicts with already declared size %uz",
                              size, &shm_zone[i].shm.name, shm_zone[i].shm.size);
              return NULL;
          }
  
          if (tag != shm_zone[i].tag) {
              ngx_conf_log_error(NGX_LOG_EMERG, cf, 0,
                              "the shared memory zone \"%V\" is "
                              "already declared for a different use",
                              &shm_zone[i].shm.name);
              return NULL;
          }
  
          return &shm_zone[i];
      }
  
      shm_zone = ngx_list_push(&cf->cycle->shared_memory);
  
      if (shm_zone == NULL) {
          return NULL;
      }
  
      shm_zone->data = NULL;
      shm_zone->shm.log = cf->cycle->log;
      shm_zone->shm.size = size;
      shm_zone->shm.name = *name;
      shm_zone->shm.exists = 0;
      shm_zone->init = NULL;
      shm_zone->tag = tag;
  
      return shm_zone;
  }
  
  
  static void
  ngx_clean_old_cycles(ngx_event_t *ev)
  {
      ngx_uint_t     i, n, found, live;
      ngx_log_t     *log;
      ngx_cycle_t  **cycle;
  
      log = ngx_cycle->log;
      ngx_temp_pool->log = log;
  
      ngx_log_debug0(NGX_LOG_DEBUG_CORE, log, 0, "clean old cycles");
  
      live = 0;
  
      cycle = ngx_old_cycles.elts;
      for (i = 0; i < ngx_old_cycles.nelts; i++) {
  
          if (cycle[i] == NULL) {
              continue;
          }
  
          found = 0;
  
          for (n = 0; n < cycle[i]->connection_n; n++) {
              if (cycle[i]->connections[n].fd != (ngx_socket_t) -1) {
                  found = 1;
  
                  ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, "live fd:%d", n);
  
                  break;
              }
          }
  
          if (found) {
              live = 1;
              continue;
          }
  
          ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, "clean old cycle: %d", i);
  
          ngx_destroy_pool(cycle[i]->pool);
          cycle[i] = NULL;
      }
  
      ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0, "old cycles status: %d", live);
  
      if (live) {
          ngx_add_timer(ev, 30000);
  
      } else {
          ngx_destroy_pool(ngx_temp_pool);
          ngx_temp_pool = NULL;
          ngx_old_cycles.nelts = 0;
      }
  }
  