libmicrohttpd2

daemon_start.c (135527B)

---

 /* SPDX-License-Identifier: LGPL-2.1-or-later OR (GPL-2.0-or-later WITH eCos-exception-2.0) */
 /*
   This file is part of GNU libmicrohttpd.
   Copyright (C) 2024-2026 Evgeny Grin (Karlson2k)
 
   GNU libmicrohttpd is free software; you can redistribute it and/or
   modify it under the terms of the GNU Lesser General Public
   License as published by the Free Software Foundation; either
   version 2.1 of the License, or (at your option) any later version.
 
   GNU libmicrohttpd is distributed in the hope that it will be useful,
   but WITHOUT ANY WARRANTY; without even the implied warranty of
   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
   Lesser General Public License for more details.
 
   Alternatively, you can redistribute GNU libmicrohttpd and/or
   modify it under the terms of the GNU General Public License as
   published by the Free Software Foundation; either version 2 of
   the License, or (at your option) any later version, together
   with the eCos exception, as follows:
 
     As a special exception, if other files instantiate templates or
     use macros or inline functions from this file, or you compile this
     file and link it with other works to produce a work based on this
     file, this file does not by itself cause the resulting work to be
     covered by the GNU General Public License. However the source code
     for this file must still be made available in accordance with
     section (3) of the GNU General Public License v2.
 
     This exception does not invalidate any other reasons why a work
     based on this file might be covered by the GNU General Public
     License.
 
   You should have received copies of the GNU Lesser General Public
   License and the GNU General Public License along with this library;
   if not, see <https://www.gnu.org/licenses/>.
 */
 
 /**
  * @file src/mhd2/daemon_start.c
  * @brief  The implementation of the MHD_daemon_start()
  * @author Karlson2k (Evgeny Grin)
  */
 
 #include "mhd_sys_options.h"
 
 #include "mhd_assert.h"
 #include "mhd_unreachable.h"
 #include "mhd_assume.h"
 
 #include "mhd_constexpr.h"
 
 #include "sys_bool_type.h"
 #include "sys_base_types.h"
 #include "sys_malloc.h"
 #include "compat_calloc.h"
 
 #include <string.h>
 #include "sys_sockets_types.h"
 #include "sys_sockets_headers.h"
 #include "mhd_sockets_macros.h"
 #include "sys_ip_headers.h"
 
 #include "mhd_atomic_counter.h"
 
 #ifdef MHD_SOCKETS_KIND_POSIX
 #  include "sys_errno.h"
 #endif
 #include "sys_select.h"
 #include "sys_poll.h"
 #ifdef MHD_SUPPORT_EPOLL
 #  include <sys/epoll.h>
 #endif
 #include "sys_kqueue.h"
 
 #ifdef MHD_SOCKETS_KIND_POSIX
 #  include <fcntl.h>
 #endif
 
 #include "extr_events_funcs.h"
 
 #include "mhd_dbg_print.h"
 
 #include "mhd_limits.h"
 
 #include "mhd_daemon.h"
 #include "daemon_options.h"
 
 #include "mhd_sockets_funcs.h"
 
 #include "mhd_lib_init.h"
 #include "daemon_logger.h"
 
 #ifdef MHD_SUPPORT_HTTPS
 #  include "mhd_tls_common.h"
 #  include "mhd_tls_funcs.h"
 #endif
 
 #include "events_process.h"
 
 #ifdef MHD_SUPPORT_THREADS
 #  include "mhd_itc.h"
 #  include "mhd_threads.h"
 #  include "daemon_funcs.h"
 #endif
 
 #include "mhd_public_api.h"
 
 
 /**
  * The default value for fastopen queue length (currently GNU/Linux only)
  */
 #define MHD_TCP_FASTOPEN_DEF_QUEUE_LEN 64
 
 /**
  * Release any internally allocated pointers, then deallocate the settings.
  * @param s the pointer to the settings to release
  */
 static void
 dsettings_release (struct DaemonOptions *s)
 {
   /* Release starting from the last member */
   if (NULL != s->random_entropy.v_buf)
     free (s->random_entropy.v_buf);
   if (MHD_INVALID_SOCKET != s->listen_socket)
     mhd_socket_close (s->listen_socket);
   if (NULL != s->bind_sa.v_sa)
     free (s->bind_sa.v_sa);
   if (NULL != s->tls_cert_key.v_mem_cert)
     free (s->tls_cert_key.v_mem_cert);
   free (s);
 }
 
 
 /**
  * Set basic daemon parameters that not require additional initialisation.
  * Mostly copy such parameters from the settings object to the daemon object.
  * @param d the daemon object
  * @param s the user settings
  * @return MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) MHD_FN_PAR_NONNULL_ (2)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 daemon_set_basic_settings (struct MHD_Daemon *restrict d,
                            struct DaemonOptions *restrict s)
 {
   mhd_constexpr uint_fast64_t max_timeout_ms_value = 1209600000u;
 
 #ifdef MHD_SUPPORT_HTTP2
   // TODO: make it configurable
   d->http_cfg.http1x = true;
   d->http_cfg.http2 = true;
 #endif /* MHD_SUPPORT_HTTP2 */
 
   d->req_cfg.strictness = s->protocol_strict_level.v_sl;
 
 #ifdef MHD_SUPPORT_COOKIES
   d->req_cfg.disable_cookies = (MHD_NO != s->disable_cookies);
 #endif
 
   d->req_cfg.suppress_date = (MHD_NO != s->suppress_date_header);
 
   d->conns.cfg.timeout_milsec = s->default_timeout_milsec;
   if (max_timeout_ms_value < d->conns.cfg.timeout_milsec)
     d->conns.cfg.timeout_milsec = max_timeout_ms_value;
 
   d->conns.cfg.per_ip_limit = s->per_ip_limit;
 
   return MHD_SC_OK;
 }
 
 
 /**
  * Set the daemon work mode.
  * This function also checks whether requested work mode is supported by
  * current build and whether work mode is compatible with requested events
  * polling technique.
  * @param d the daemon object
  * @param s the user settings
  * @return MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) MHD_FN_PAR_NONNULL_ (2)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 daemon_set_work_mode (struct MHD_Daemon *restrict d,
                       struct DaemonOptions *restrict s)
 {
   switch (s->work_mode.mode)
   {
   case MHD_WM_EXTERNAL_PERIODIC:
     d->wmode_int = mhd_WM_INT_INTERNAL_EVENTS_NO_THREADS;
     break;
   case MHD_WM_EXTERNAL_EVENT_LOOP_CB_LEVEL:
   case MHD_WM_EXTERNAL_EVENT_LOOP_CB_EDGE:
     if (MHD_SPS_AUTO != s->poll_syscall)
     {
       mhd_LOG_MSG ( \
         d, MHD_SC_SYSCALL_WORK_MODE_COMBINATION_INVALID, \
         "The requested work mode is not compatible with setting " \
         "socket polling syscall.");
       return MHD_SC_SYSCALL_WORK_MODE_COMBINATION_INVALID;
     }
     if (MHD_WM_EXTERNAL_EVENT_LOOP_CB_LEVEL == s->work_mode.mode)
       d->wmode_int = mhd_WM_INT_EXTERNAL_EVENTS_LEVEL;
     else
       d->wmode_int = mhd_WM_INT_EXTERNAL_EVENTS_EDGE;
     break;
   case MHD_WM_EXTERNAL_SINGLE_FD_WATCH:
     if ((MHD_SPS_AUTO != s->poll_syscall) &&
         (MHD_SPS_EPOLL != s->poll_syscall) &&
         (MHD_SPS_KQUEUE != s->poll_syscall))
     {
       mhd_LOG_MSG ( \
         d, MHD_SC_SYSCALL_WORK_MODE_COMBINATION_INVALID, \
         "The requested work mode MHD_WM_EXTERNAL_SINGLE_FD_WATCH " \
         "is not compatible with requested socket polling syscall.");
       return MHD_SC_SYSCALL_WORK_MODE_COMBINATION_INVALID;
     }
 #if ! defined(MHD_SUPPORT_EPOLL) && ! defined(MHD_SUPPORT_KQUEUE)
     mhd_LOG_MSG ( \
       d, MHD_SC_FEATURE_DISABLED, \
       "The epoll or kqueue is required for the requested work mode " \
       "MHD_WM_EXTERNAL_SINGLE_FD_WATCH, but none is available on this " \
       "platform or MHD build.");
     return MHD_SC_FEATURE_DISABLED;
 #else
     d->wmode_int = mhd_WM_INT_INTERNAL_EVENTS_NO_THREADS;
 #endif
     break;
   case MHD_WM_THREAD_PER_CONNECTION:
     if (MHD_SPS_EPOLL == s->poll_syscall)
     {
       mhd_LOG_MSG ( \
         d, MHD_SC_SYSCALL_WORK_MODE_COMBINATION_INVALID, \
         "The requested work mode MHD_WM_THREAD_PER_CONNECTION " \
         "is not compatible with 'epoll' sockets polling.");
       return MHD_SC_SYSCALL_WORK_MODE_COMBINATION_INVALID;
     }
     if (MHD_SPS_KQUEUE == s->poll_syscall)
     {
       mhd_LOG_MSG ( \
         d, MHD_SC_SYSCALL_WORK_MODE_COMBINATION_INVALID, \
         "The requested work mode MHD_WM_THREAD_PER_CONNECTION " \
         "is not compatible with 'kqueue' sockets polling.");
       return MHD_SC_SYSCALL_WORK_MODE_COMBINATION_INVALID;
     }
     mhd_FALLTHROUGH;
   /* Intentional fallthrough */
   case MHD_WM_WORKER_THREADS:
 #ifndef MHD_SUPPORT_THREADS
     mhd_LOG_MSG (d, MHD_SC_FEATURE_DISABLED, \
                  "The internal threads modes are not supported by this " \
                  "build of MHD.");
     return MHD_SC_FEATURE_DISABLED;
 #else  /* MHD_SUPPORT_THREADS */
     if (MHD_WM_THREAD_PER_CONNECTION == s->work_mode.mode)
       d->wmode_int = mhd_WM_INT_INTERNAL_EVENTS_THREAD_PER_CONNECTION;
     else if (1 >= s->work_mode.params.num_worker_threads)   /* && (MHD_WM_WORKER_THREADS == s->work_mode.mode) */
       d->wmode_int = mhd_WM_INT_INTERNAL_EVENTS_ONE_THREAD;
     else
       d->wmode_int = mhd_WM_INT_INTERNAL_EVENTS_THREAD_POOL;
 #endif /* MHD_SUPPORT_THREADS */
     break;
   default:
     mhd_LOG_MSG (d, MHD_SC_CONFIGURATION_UNEXPECTED_WM, \
                  "Wrong requested work mode.");
     return MHD_SC_CONFIGURATION_UNEXPECTED_WM;
   }
 
   if ((mhd_WM_INT_EXTERNAL_EVENTS_LEVEL != d->wmode_int) &&
       (mhd_WM_INT_EXTERNAL_EVENTS_EDGE != d->wmode_int) &&
       (MHD_NO != s->reregister_all))
   {
     mhd_LOG_MSG ( \
       d, \
       MHD_SC_EXTERNAL_EVENT_ONLY, \
       "The MHD_D_O_REREGISTER_ALL option can be used only with external " \
       "events work modes.");
     return MHD_SC_EXTERNAL_EVENT_ONLY;
   }
 
   return MHD_SC_OK;
 }
 
 
 union mhd_SockaddrAny
 {
   struct sockaddr sa;
   struct sockaddr_in sa_i4;
 #ifdef HAVE_INET6
   struct sockaddr_in6 sa_i6;
 #endif /* HAVE_INET6 */
   struct sockaddr_storage sa_stor;
 };
 
 
 /**
  * The type of the socket to create
  */
 enum mhd_CreateSktType
 {
   /**
    * Unknown address family (could be IP or not IP)
    */
   mhd_SKT_UNKNOWN = -4
   ,
   /**
    * The socket is not IP.
    */
   mhd_SKT_NON_IP = -2
   ,
   /**
    * The socket is UNIX.
    */
   mhd_SKT_UNIX = -1
   ,
   /**
    * No socket
    */
   mhd_SKT_NO_SOCKET = MHD_AF_NONE
   ,
   /**
    * IPv4 only
    */
   mhd_SKT_IP_V4_ONLY = MHD_AF_INET4
   ,
   /**
    * IPv6 only
    */
   mhd_SKT_IP_V6_ONLY = MHD_AF_INET6
   ,
   /**
    * IPv6 with dual stack enabled
    */
   mhd_SKT_IP_DUAL_REQUIRED = MHD_AF_DUAL
   ,
   /**
    * Try IPv6 with dual stack then IPv4
    */
   mhd_SKT_IP_V4_WITH_V6_OPT = MHD_AF_DUAL_v6_OPTIONAL
   ,
   /**
    * IPv6 with optional dual stack
    */
   mhd_SKT_IP_V6_WITH_V4_OPT = MHD_AF_DUAL_v4_OPTIONAL
   ,
   /**
    * Try IPv4 then IPv6 with optional dual stack
    */
   mhd_SKT_IP_V4_WITH_FALLBACK = 16
 };
 
 /**
  * Create socket, bind to the address and start listening on the socket.
  *
  * The socket is assigned to the daemon as listening FD.
  * @param d the daemon to use
  * @param s the user settings
  * @param v6_tried true if IPv6 has been tried already
  * @param force_v6_any_dual true if IPv6 is forced with dual stack either
  *                          enabled or not
  * @param prev_bnd_lstn_err if this function was already tried with another and
  *                          failed to bind or to start listening then
  *                          this parameter must be set to respecting status
  *                          code, otherwise this parameter must be #MHD_SC_OK
  * @return #MHD_SC_OK on success,
  *         the error code otherwise (no error printed to log if result is
  *         #MHD_SC_LISTEN_SOCKET_BIND_FAILED or #MHD_SC_LISTEN_FAILURE)
  */
 static enum MHD_StatusCode
 create_bind_listen_stream_socket_inner (struct MHD_Daemon *restrict d,
                                         struct DaemonOptions *restrict s,
                                         bool v6_tried,
                                         bool force_v6_any_dual,
                                         enum MHD_StatusCode prev_bnd_lstn_err)
 {
   MHD_Socket sk;
   enum mhd_CreateSktType sk_type;
   bool sk_already_listening;
   union mhd_SockaddrAny sa_all;
   const struct sockaddr *p_use_sa;
   socklen_t use_sa_size;
   uint_least16_t sk_port;
   bool is_non_block;
   bool is_non_inhr;
   enum MHD_StatusCode ret;
 
   sk = MHD_INVALID_SOCKET;
   sk_type = mhd_SKT_NO_SOCKET;
   sk_already_listening = false;
   p_use_sa = NULL;
   use_sa_size = 0;
   sk_port = 0;
 
 #ifndef HAVE_INET6
   mhd_assert (! v6_tried);
   mhd_assert (! force_v6_any_dual);
 #endif
   mhd_assert (mhd_SKT_NO_SOCKET == sk_type); /* Mute analyser warning */
 
   if (MHD_INVALID_SOCKET != s->listen_socket)
   {
     mhd_assert (! v6_tried);
     mhd_assert (! force_v6_any_dual);
     /* Check for options conflicts */
     if (0 != s->bind_sa.v_sa_len)
     {
       mhd_LOG_MSG (d, MHD_SC_OPTIONS_CONFLICT, \
                    "MHD_D_O_BIND_SA cannot be used together " \
                    "with MHD_D_O_LISTEN_SOCKET");
       return MHD_SC_OPTIONS_CONFLICT;
     }
     else if (MHD_AF_NONE != s->bind_port.v_af)
     {
       mhd_LOG_MSG (d, MHD_SC_OPTIONS_CONFLICT, \
                    "MHD_D_O_BIND_PORT cannot be used together " \
                    "with MHD_D_O_LISTEN_SOCKET");
       return MHD_SC_OPTIONS_CONFLICT;
     }
 
     /* No options conflicts */
     sk = s->listen_socket;
     s->listen_socket = MHD_INVALID_SOCKET; /* Prevent closing with settings cleanup */
     sk_type = mhd_SKT_UNKNOWN;
     sk_already_listening = true;
   }
   else if ((0 != s->bind_sa.v_sa_len) || (MHD_AF_NONE != s->bind_port.v_af))
   {
     if (0 != s->bind_sa.v_sa_len)
     {
       mhd_assert (! v6_tried);
       mhd_assert (! force_v6_any_dual);
 
       /* Check for options conflicts */
       if (MHD_AF_NONE != s->bind_port.v_af)
       {
         mhd_LOG_MSG (d, MHD_SC_OPTIONS_CONFLICT, \
                      "MHD_D_O_BIND_SA cannot be used together " \
                      "with MHD_D_O_BIND_PORT");
         return MHD_SC_OPTIONS_CONFLICT;
       }
 
       /* No options conflicts */
       switch (s->bind_sa.v_sa->sa_family)
       {
       case AF_INET:
         sk_type = mhd_SKT_IP_V4_ONLY;
         if (sizeof(sa_all.sa_i4) > s->bind_sa.v_sa_len)
         {
           mhd_LOG_MSG (d, MHD_SC_CONFIGURATION_WRONG_SA_SIZE, \
                        "The size of the provided sockaddr does not match "
                        "used address family");
           return MHD_SC_CONFIGURATION_WRONG_SA_SIZE;
         }
         memcpy (&(sa_all.sa_i4), s->bind_sa.v_sa, sizeof(sa_all.sa_i4));
         sk_port = (uint_least16_t) ntohs (sa_all.sa_i4.sin_port);
 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
         mhd_assert (sizeof(sa_all.sa_i4) == (uint8_t) sizeof(sa_all.sa_i4));
         sa_all.sa_i4.sin_len = (uint8_t) sizeof(sa_all.sa_i4);
 #endif
         p_use_sa = (struct sockaddr *) &(sa_all.sa_i4);
         use_sa_size = (socklen_t) sizeof(sa_all.sa_i4);
         break;
 #ifdef HAVE_INET6
       case AF_INET6:
         sk_type = mhd_SKT_IP_V6_ONLY;
         if (sizeof(sa_all.sa_i6) > s->bind_sa.v_sa_len)
         {
           mhd_LOG_MSG (d, MHD_SC_CONFIGURATION_WRONG_SA_SIZE, \
                        "The size of the provided sockaddr does not match "
                        "used address family");
           return MHD_SC_CONFIGURATION_WRONG_SA_SIZE;
         }
         memcpy (&(sa_all.sa_i6), s->bind_sa.v_sa, s->bind_sa.v_sa_len);
         sk_port = (uint_least16_t) ntohs (sa_all.sa_i6.sin6_port);
 #ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_LEN
         mhd_assert (sizeof(sa_all.sa_i6) == (uint8_t) sizeof(sa_all.sa_i6));
         sa_all.sa_i6.sin6_len = (uint8_t) sizeof(sa_all.sa_i6);
 #endif
         p_use_sa = (struct sockaddr *) &(sa_all.sa_i6);
         use_sa_size = (socklen_t) sizeof(sa_all.sa_i6);
         break;
 #endif /* HAVE_INET6 */
 #ifdef MHD_AF_UNIX
       case MHD_AF_UNIX:
         sk_type = mhd_SKT_UNIX;
         p_use_sa = NULL; /* To be set below */
         break;
 #endif /* MHD_AF_UNIX */
       default:
         sk_type = mhd_SKT_UNKNOWN;
         p_use_sa = NULL; /* To be set below */
         break;
       }
 
       if (s->bind_sa.v_dual)
       {
         if (mhd_SKT_IP_V6_ONLY != sk_type)
         {
           mhd_LOG_MSG (d, MHD_SC_LISTEN_DUAL_STACK_NOT_SUITABLE, \
                        "IP dual stack is not possible for provided sockaddr");
         }
 #ifdef HAVE_INET6
         else
         {
 #ifdef HAVE_DCLR_IPV6_V6ONLY
           sk_type = mhd_SKT_IP_DUAL_REQUIRED;
 #else  /* ! IPV6_V6ONLY */
           mhd_LOG_MSG (d, \
                        MHD_SC_LISTEN_DUAL_STACK_CONFIGURATION_NOT_SUPPORTED, \
                        "IP dual stack is not supported by this platform or " \
                        "by this MHD build");
 #endif /* ! IPV6_V6ONLY */
         }
 #endif /* HAVE_INET6 */
       }
 
       if (NULL == p_use_sa)
       {
 #if defined(HAVE_STRUCT_SOCKADDR_SA_LEN) && \
         defined(HAVE_STRUCT_SOCKADDR_STORAGE_SS_LEN)
         if ((((size_t) s->bind_sa.v_sa->sa_len) != s->bind_sa.v_sa_len) &&
             (sizeof(sa_all) >= s->bind_sa.v_sa_len))
         {
           /* Fix embedded 'sa_len' member if possible */
           memcpy (&sa_all, s->bind_sa.v_sa, s->bind_sa.v_sa_len);
           mhd_assert (s->bind_sa.v_sa_len == (uint8_t) s->bind_sa.v_sa_len);
           sa_all.sa_stor.ss_len = (uint8_t) s->bind_sa.v_sa_len;
           p_use_sa = (const struct sockaddr *) &(sa_all.sa_stor);
         }
         else
 #endif /* HAVE_STRUCT_SOCKADDR_SA_LEN && HAVE_STRUCT_SOCKADDR_STORAGE_SS_LEN */
         p_use_sa = s->bind_sa.v_sa;
         use_sa_size = (socklen_t) s->bind_sa.v_sa_len;
       }
     }
     else /* if (MHD_AF_NONE != s->bind_port.v_af) */
     {
       /* No options conflicts */
       switch (s->bind_port.v_af)
       {
       case MHD_AF_NONE:
         mhd_assert (0);
         mhd_UNREACHABLE ();
         return MHD_SC_INTERNAL_ERROR;
       case MHD_AF_AUTO:
 #ifdef HAVE_INET6
 #ifdef HAVE_DCLR_IPV6_V6ONLY
         if (force_v6_any_dual)
           sk_type = mhd_SKT_IP_V6_WITH_V4_OPT;
         else if (v6_tried)
           sk_type = mhd_SKT_IP_V4_WITH_FALLBACK;
         else
           sk_type = mhd_SKT_IP_V4_WITH_V6_OPT;
 #else  /* ! IPV6_V6ONLY */
         mhd_assert (! v6_tried);
         if (force_v6_any_dual)
           sk_type = mhd_SKT_IP_V6_ONLY;
         else
           sk_type = mhd_SKT_IP_V4_WITH_FALLBACK;
 #endif /* ! IPV6_V6ONLY */
 #else  /* ! HAVE_INET6 */
         sk_type = mhd_SKT_IP_V4_ONLY;
 #endif /* ! HAVE_INET6 */
         break;
       case MHD_AF_INET4:
         mhd_assert (! v6_tried);
         mhd_assert (! force_v6_any_dual);
         sk_type = mhd_SKT_IP_V4_ONLY;
         break;
       case MHD_AF_INET6:
         mhd_assert (! v6_tried);
         mhd_assert (! force_v6_any_dual);
 #ifdef HAVE_INET6
         sk_type = mhd_SKT_IP_V6_ONLY;
 #else  /* ! HAVE_INET6 */
         mhd_LOG_MSG (d, MHD_SC_IPV6_NOT_SUPPORTED_BY_BUILD, \
                      "IPv6 is not supported by this MHD build or " \
                      "by this platform");
         return MHD_SC_IPV6_NOT_SUPPORTED_BY_BUILD;
 #endif /* ! HAVE_INET6 */
         break;
       case MHD_AF_DUAL:
         mhd_assert (! v6_tried);
         mhd_assert (! force_v6_any_dual);
 #ifdef HAVE_INET6
 #ifdef HAVE_DCLR_IPV6_V6ONLY
         sk_type = mhd_SKT_IP_DUAL_REQUIRED;
 #else  /* ! IPV6_V6ONLY */
         mhd_LOG_MSG (d,
                      MHD_SC_LISTEN_DUAL_STACK_CONFIGURATION_NOT_SUPPORTED, \
                      "IP dual stack is not supported by this platform or " \
                      "by this MHD build");
         sk_type = mhd_SKT_IP_V6_ONLY;
 #endif /* ! IPV6_V6ONLY */
 #else  /* ! HAVE_INET6 */
         mhd_LOG_MSG (d, MHD_SC_IPV6_NOT_SUPPORTED_BY_BUILD, \
                      "IPv6 is not supported by this MHD build or " \
                      "by this platform");
         return MHD_SC_IPV6_NOT_SUPPORTED_BY_BUILD;
 #endif /* ! HAVE_INET6 */
         break;
       case MHD_AF_DUAL_v4_OPTIONAL:
         mhd_assert (! v6_tried);
         mhd_assert (! force_v6_any_dual);
 #ifdef HAVE_INET6
 #ifdef HAVE_DCLR_IPV6_V6ONLY
         sk_type = mhd_SKT_IP_V6_WITH_V4_OPT;
 #else  /* ! IPV6_V6ONLY */
         sk_type = mhd_SKT_IP_V6_ONLY;
 #endif /* ! IPV6_V6ONLY */
 #else  /* ! HAVE_INET6 */
         mhd_LOG_MSG (d, MHD_SC_IPV6_NOT_SUPPORTED_BY_BUILD, \
                      "IPv6 is not supported by this MHD build or " \
                      "by this platform");
         return MHD_SC_IPV6_NOT_SUPPORTED_BY_BUILD;
 #endif /* ! HAVE_INET6 */
         break;
       case MHD_AF_DUAL_v6_OPTIONAL:
         mhd_assert (! force_v6_any_dual);
 #ifdef HAVE_INET6
 #ifdef HAVE_DCLR_IPV6_V6ONLY
         sk_type = (! v6_tried) ?
                   mhd_SKT_IP_V4_WITH_V6_OPT : mhd_SKT_IP_V4_ONLY;
 #else  /* ! IPV6_V6ONLY */
         mhd_assert (! v6_tried);
         sk_type = mhd_SKT_IP_V4_ONLY;
 #endif /* ! IPV6_V6ONLY */
 #else  /* ! HAVE_INET6 */
         mhd_assert (! v6_tried);
         sk_type = mhd_SKT_IP_V4_ONLY;
 #endif /* ! HAVE_INET6 */
         break;
       default:
         mhd_LOG_MSG (d, MHD_SC_AF_NOT_SUPPORTED_BY_BUILD, \
                      "Unknown address family specified");
         return MHD_SC_AF_NOT_SUPPORTED_BY_BUILD;
       }
 
       mhd_assert (mhd_SKT_NO_SOCKET < sk_type);
 
       switch (sk_type)
       {
       case mhd_SKT_IP_V4_ONLY:
       case mhd_SKT_IP_V4_WITH_FALLBACK:
         /* Zeroing is not required, but may help on exotic platforms */
         memset (&(sa_all.sa_i4), 0, sizeof(sa_all.sa_i4));
         sa_all.sa_i4.sin_family = AF_INET;
         sa_all.sa_i4.sin_port = htons (s->bind_port.v_port);
         sa_all.sa_i4.sin_addr.s_addr = INADDR_ANY;
         if (0 != INADDR_ANY) /* Optimised at compile time */
           sa_all.sa_i4.sin_addr.s_addr = htonl (INADDR_ANY);
 #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN
         sa_all.sa_i4.sin_len = (uint8_t) sizeof (sa_all.sa_i4);
 #endif
         p_use_sa = (const struct sockaddr *) &(sa_all.sa_i4);
         use_sa_size = (socklen_t) sizeof (sa_all.sa_i4);
         break;
       case mhd_SKT_IP_V6_ONLY:
       case mhd_SKT_IP_DUAL_REQUIRED:
       case mhd_SKT_IP_V4_WITH_V6_OPT:
       case mhd_SKT_IP_V6_WITH_V4_OPT:
 #ifdef HAVE_INET6
         if (1)
         {
 #ifdef IN6ADDR_ANY_INIT
           static const struct in6_addr static_in6any = IN6ADDR_ANY_INIT;
 #endif
           /* Zeroing is required by POSIX */
           memset (&(sa_all.sa_i6), 0, sizeof(sa_all.sa_i6));
           sa_all.sa_i6.sin6_family = AF_INET6;
           sa_all.sa_i6.sin6_port = htons (s->bind_port.v_port);
 #ifdef IN6ADDR_ANY_INIT /* Optional assignment at the address is all zeros anyway */
           sa_all.sa_i6.sin6_addr = static_in6any;
 #endif
 #ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_LEN
           sa_all.sa_i6.sin6_len = (uint8_t) sizeof (sa_all.sa_i6);
 #endif
           p_use_sa = (const struct sockaddr *) &(sa_all.sa_i6);
           use_sa_size = (socklen_t) sizeof (sa_all.sa_i6);
         }
         break;
 #endif /* HAVE_INET6 */
       case mhd_SKT_UNKNOWN:
       case mhd_SKT_NON_IP:
       case mhd_SKT_UNIX:
       case mhd_SKT_NO_SOCKET:
       default:
         mhd_UNREACHABLE ();
         return MHD_SC_INTERNAL_ERROR;
       }
 
       sk_port = s->bind_port.v_port;
 
     }
   }
   else
   {
     /* No listen socket */
     d->net.listen.fd = MHD_INVALID_SOCKET;
     d->net.listen.is_broken = false;
     d->net.listen.type = mhd_SOCKET_TYPE_UNKNOWN;
     d->net.listen.non_block = false;
     d->net.listen.port = 0;
 
     return MHD_SC_OK;
   }
 
   mhd_assert (mhd_SKT_NO_SOCKET != sk_type);
   mhd_assert ((NULL != p_use_sa) || sk_already_listening);
   mhd_assert ((MHD_INVALID_SOCKET == sk) || sk_already_listening);
 
   if (MHD_INVALID_SOCKET == sk)
   {
     mhd_assert (NULL != p_use_sa);
 #if defined(MHD_SOCKETS_KIND_WINSOCK) && defined(WSA_FLAG_NO_HANDLE_INHERIT)
     /* May fail before Win7 SP1 */
     sk = WSASocketW (p_use_sa->sa_family, SOCK_STREAM, 0,
                      NULL, 0, WSA_FLAG_OVERLAPPED | WSA_FLAG_NO_HANDLE_INHERIT);
 
     if (MHD_INVALID_SOCKET == sk)
 #endif /* MHD_SOCKETS_KIND_WINSOCK && WSA_FLAG_NO_HANDLE_INHERIT */
     sk = socket (p_use_sa->sa_family,
                  SOCK_STREAM | mhd_SOCK_NONBLOCK
                  | mhd_SOCK_CLOEXEC | mhd_SOCK_NOSIGPIPE, 0);
 
     if (MHD_INVALID_SOCKET == sk)
     {
 #ifdef HAVE_INET6
       if (mhd_SKT_IP_V4_WITH_FALLBACK == sk_type)
         return create_bind_listen_stream_socket_inner (d,
                                                        s,
                                                        v6_tried,
                                                        true,
                                                        prev_bnd_lstn_err);
       if (mhd_SKT_IP_V4_WITH_V6_OPT == sk_type)
         return create_bind_listen_stream_socket_inner (d,
                                                        s,
                                                        true,
                                                        false,
                                                        prev_bnd_lstn_err);
 #endif /* HAVE_INET6 */
 
       if (MHD_SC_OK != prev_bnd_lstn_err)
         return prev_bnd_lstn_err;
 
       if (mhd_SCKT_LERR_IS_AF ())
       {
         mhd_LOG_MSG (d, MHD_SC_AF_NOT_AVAILABLE, \
                      "The requested socket address family is rejected " \
                      "by the OS");
         return MHD_SC_AF_NOT_AVAILABLE;
       }
       mhd_LOG_MSG (d, MHD_SC_FAILED_TO_OPEN_LISTEN_SOCKET, \
                    "Failed to open listen socket");
 
       return MHD_SC_FAILED_TO_OPEN_LISTEN_SOCKET;
     }
     is_non_block = (0 != mhd_SOCK_NONBLOCK);
     is_non_inhr = (0 != mhd_SOCK_CLOEXEC);
   }
   else
   {
     is_non_block = false; /* Try to set non-block */
     is_non_inhr = false;  /* Try to set non-inheritable */
   }
 
   /* The listen socket must be closed if error code returned
      beyond this point */
 
   ret = MHD_SC_OK;
 
   do
   { /* The scope for automatic socket close for error returns */
     if (! mhd_FD_FITS_DAEMON (d,sk))
     {
       mhd_LOG_MSG (d, MHD_SC_LISTEN_FD_OUTSIDE_OF_SET_RANGE, \
                    "The listen FD value is higher than allowed");
       ret = MHD_SC_LISTEN_FD_OUTSIDE_OF_SET_RANGE;
       break;
     }
 
     if (! is_non_inhr)
     {
       if (! mhd_socket_noninheritable (sk))
         mhd_LOG_MSG (d, MHD_SC_LISTEN_SOCKET_NOINHERIT_FAILED, \
                      "OS refused to make the listen socket non-inheritable");
     }
 
     if (! sk_already_listening)
     {
 #ifdef HAVE_INET6
 #ifdef HAVE_DCLR_IPV6_V6ONLY
       if ((mhd_SKT_IP_V6_ONLY == sk_type) ||
           (mhd_SKT_IP_DUAL_REQUIRED == sk_type) ||
           (mhd_SKT_IP_V4_WITH_V6_OPT == sk_type) ||
           (mhd_SKT_IP_V6_WITH_V4_OPT == sk_type) ||
           (mhd_SKT_UNKNOWN == sk_type))
       {
         mhd_SCKT_OPT_BOOL no_dual_to_set;
         bool use_dual;
 
         use_dual = ((mhd_SKT_IP_DUAL_REQUIRED == sk_type) ||
                     (mhd_SKT_IP_V4_WITH_V6_OPT == sk_type) ||
                     (mhd_SKT_IP_V6_WITH_V4_OPT == sk_type));
         no_dual_to_set = use_dual ? 0 : 1;
 
         if (0 != mhd_setsockopt (sk, IPPROTO_IPV6, IPV6_V6ONLY,
                                  (void *) &no_dual_to_set,
                                  sizeof (no_dual_to_set)))
         {
           mhd_SCKT_OPT_BOOL no_dual_current;
           socklen_t opt_size;
           bool state_unknown;
           bool state_match;
 
           no_dual_current = 0;
           opt_size = sizeof(no_dual_current);
 
           /* Some platforms forbid setting this options, but allow
              reading. */
           if ((0 != mhd_getsockopt (sk, IPPROTO_IPV6, IPV6_V6ONLY,
                                     (void*) &no_dual_current, &opt_size))
               || (((socklen_t) sizeof(no_dual_current)) < opt_size))
           {
             state_unknown = true;
             state_match = false;
           }
           else
           {
             state_unknown = false;
             state_match = ((! ! no_dual_current) == (! ! no_dual_to_set));
           }
 
           if (state_unknown || ! state_match)
           {
             if (mhd_SKT_IP_V4_WITH_V6_OPT == sk_type)
             {
               (void) mhd_socket_close (sk);
               return create_bind_listen_stream_socket_inner (d,
                                                              s,
                                                              true,
                                                              false,
                                                              prev_bnd_lstn_err);
             }
             if (! state_unknown)
             {
               /* The dual-stack state is definitely wrong */
               if (mhd_SKT_IP_V6_ONLY == sk_type)
               {
                 mhd_LOG_MSG ( \
                   d, MHD_SC_LISTEN_DUAL_STACK_CONFIGURATION_REJECTED, \
                   "Failed to disable IP dual-stack configuration " \
                   "for the listen socket");
                 ret = (MHD_SC_OK == prev_bnd_lstn_err) ?
                       MHD_SC_LISTEN_DUAL_STACK_CONFIGURATION_REJECTED :
                       prev_bnd_lstn_err;
                 break;
               }
               else if (mhd_SKT_UNKNOWN != sk_type)
               {
                 mhd_LOG_MSG ( \
                   d, MHD_SC_LISTEN_DUAL_STACK_CONFIGURATION_REJECTED, \
                   "Cannot enable IP dual-stack configuration " \
                   "for the listen socket");
                 if (mhd_SKT_IP_DUAL_REQUIRED == sk_type)
                 {
                   ret = (MHD_SC_OK == prev_bnd_lstn_err) ?
                         MHD_SC_LISTEN_DUAL_STACK_CONFIGURATION_REJECTED :
                         prev_bnd_lstn_err;
                   break;
                 }
               }
             }
             else
             {
               /* The dual-stack state is unknown */
               if (mhd_SKT_UNKNOWN != sk_type)
                 mhd_LOG_MSG (
                   d, MHD_SC_LISTEN_DUAL_STACK_CONFIGURATION_UNKNOWN, \
                   "Failed to set dual-stack (IPV6_ONLY) configuration " \
                   "for the listen socket, using system defaults");
             }
           }
         }
       }
 #else  /* ! IPV6_V6ONLY */
       mhd_assert (mhd_SKT_IP_DUAL_REQUIRED != sk_type);
       mhd_assert (mhd_SKT_IP_V4_WITH_V6_OPT != sk_type);
       mhd_assert (mhd_SKT_IP_V6_WITH_V4_OPT != sk_type);
 #endif /* ! IPV6_V6ONLY */
 #endif /* HAVE_INET6 */
 
       if (MHD_FOM_AUTO <= d->settings->tcp_fastopen.v_option)
       {
 #if defined(HAVE_DCLR_TCP_FASTOPEN)
         int fo_param;
 #ifdef __linux__
         /* The parameter is the queue length */
         fo_param = (int) d->settings->tcp_fastopen.v_queue_length;
         if (0 == fo_param)
           fo_param = MHD_TCP_FASTOPEN_DEF_QUEUE_LEN;
 #else  /* ! __linux__ */
         fo_param = 1; /* The parameter is on/off type of setting */
 #endif /* ! __linux__ */
         if (0 != mhd_setsockopt (sk, IPPROTO_TCP, TCP_FASTOPEN,
                                  (const void *) &fo_param,
                                  sizeof (fo_param)))
         {
           mhd_LOG_MSG (d, MHD_SC_LISTEN_FAST_OPEN_FAILURE, \
                        "OS refused to enable TCP Fast Open on " \
                        "the listen socket");
           if (MHD_FOM_AUTO < d->settings->tcp_fastopen.v_option)
           {
             ret = MHD_SC_LISTEN_FAST_OPEN_FAILURE;
             break;
           }
         }
 #else  /* ! TCP_FASTOPEN */
         if (MHD_FOM_AUTO < d->settings->tcp_fastopen.v_option)
         {
           mhd_LOG_MSG (d, MHD_SC_LISTEN_FAST_OPEN_FAILURE, \
                        "The OS does not support TCP Fast Open");
           ret = MHD_SC_LISTEN_FAST_OPEN_FAILURE;
           break;
         }
 #endif
       }
 
       if (MHD_D_OPTION_BIND_TYPE_NOT_SHARED >= d->settings->listen_addr_reuse)
       {
 #ifndef MHD_SOCKETS_KIND_WINSOCK
 #ifdef HAVE_DCLR_SO_REUSEADDR
         mhd_SCKT_OPT_BOOL on_val1 = 1;
         if (0 != mhd_setsockopt (sk, SOL_SOCKET, SO_REUSEADDR,
                                  (const void *) &on_val1, sizeof (on_val1)))
         {
           mhd_LOG_MSG (d, MHD_SC_LISTEN_PORT_REUSE_ENABLE_FAILED, \
                        "OS refused to enable address reuse on " \
                        "the listen socket");
         }
 #else  /* ! SO_REUSEADDR */
         mhd_LOG_MSG (d, MHD_SC_LISTEN_ADDRESS_REUSE_ENABLE_NOT_SUPPORTED, \
                      "The OS does not support address reuse for sockets");
 #endif /* ! SO_REUSEADDR */
 #endif /* ! MHD_SOCKETS_KIND_WINSOCK */
         if (MHD_D_OPTION_BIND_TYPE_NOT_SHARED > d->settings->listen_addr_reuse)
         {
 #if defined(HAVE_DCLR_SO_REUSEPORT) || defined(MHD_SOCKETS_KIND_WINSOCK)
           int opt_name;
           mhd_SCKT_OPT_BOOL on_val2 = 1;
 #ifndef MHD_SOCKETS_KIND_WINSOCK
           opt_name = SO_REUSEPORT;
 #else  /* ! MHD_SOCKETS_KIND_WINSOCK */
           opt_name = SO_REUSEADDR; /* On W32 it is the same as SO_REUSEPORT on other platforms */
 #endif /* ! MHD_SOCKETS_KIND_WINSOCK */
           if (0 != mhd_setsockopt (sk, \
                                    SOL_SOCKET, \
                                    opt_name, \
                                    (const void *) &on_val2, \
                                    sizeof (on_val2)))
           {
             mhd_LOG_MSG (d, MHD_SC_LISTEN_ADDRESS_REUSE_ENABLE_FAILED, \
                          "OS refused to enable address sharing " \
                          "on the listen socket");
             ret = MHD_SC_LISTEN_ADDRESS_REUSE_ENABLE_FAILED;
             break;
           }
 #else  /* ! SO_REUSEADDR && ! MHD_SOCKETS_KIND_WINSOCK */
           mhd_LOG_MSG (d, MHD_SC_LISTEN_ADDRESS_REUSE_ENABLE_NOT_SUPPORTED, \
                        "The OS does not support address sharing for sockets");
           ret = MHD_SC_LISTEN_ADDRESS_REUSE_ENABLE_NOT_SUPPORTED;
           break;
 #endif /* ! SO_REUSEADDR && ! MHD_SOCKETS_KIND_WINSOCK */
         }
       }
 #if defined(SO_EXCLUSIVEADDRUSE) || defined(SO_EXCLBIND)
       else if (MHD_D_OPTION_BIND_TYPE_EXCLUSIVE <=
                d->settings->listen_addr_reuse)
       {
         int opt_name;
         mhd_SCKT_OPT_BOOL on_val = 1;
 #ifdef SO_EXCLUSIVEADDRUSE
         opt_name = SO_EXCLUSIVEADDRUSE;
 #else
         opt_name = SO_EXCLBIND;
 #endif
         if (0 != mhd_setsockopt (sk, \
                                  SOL_SOCKET, \
                                  opt_name, \
                                  (const void *) &on_val, \
                                  sizeof (on_val)))
         {
           mhd_LOG_MSG (d, MHD_SC_LISTEN_ADDRESS_EXCLUSIVE_ENABLE_FAILED, \
                        "OS refused to enable exclusive address use " \
                        "on the listen socket");
           ret = MHD_SC_LISTEN_ADDRESS_EXCLUSIVE_ENABLE_FAILED;
           break;
         }
       }
 #endif /* SO_EXCLUSIVEADDRUSE || SO_EXCLBIND */
 
       mhd_assert (NULL != p_use_sa);
       mhd_assert (0 != use_sa_size);
       if (0 != bind (sk, p_use_sa, use_sa_size))
       {
         ret = (MHD_SC_OK == prev_bnd_lstn_err) ?
               MHD_SC_LISTEN_SOCKET_BIND_FAILED : prev_bnd_lstn_err;
 #ifdef HAVE_INET6
         if (mhd_SKT_IP_V4_WITH_FALLBACK == sk_type)
         {
           (void) mhd_socket_close (sk);
           return create_bind_listen_stream_socket_inner (d,
                                                          s,
                                                          v6_tried,
                                                          true,
                                                          ret);
         }
         if (mhd_SKT_IP_V4_WITH_V6_OPT == sk_type)
         {
           (void) mhd_socket_close (sk);
           return create_bind_listen_stream_socket_inner (d,
                                                          s,
                                                          true,
                                                          false,
                                                          ret);
         }
 #endif /* HAVE_INET6 */
         break;
       }
 
       if (1)
       {
         int accept_queue_len;
         accept_queue_len = (int) s->listen_backlog;
         if (0 > accept_queue_len)
           accept_queue_len = 0;
         if (0 == accept_queue_len)
         {
 #if defined(SOMAXCONN) || defined(HAVE_DCLR_SOMAXCONN)
           accept_queue_len = SOMAXCONN;
 #else  /* ! SOMAXCONN */
           accept_queue_len = 127; /* Should be the safe value */
 #endif /* ! SOMAXCONN */
         }
         if (0 != listen (sk, accept_queue_len))
         {
           ret = MHD_SC_LISTEN_FAILURE;
 #ifdef HAVE_INET6
           if (mhd_SKT_IP_V4_WITH_FALLBACK == sk_type)
           {
             (void) mhd_socket_close (sk);
             return create_bind_listen_stream_socket_inner (d,
                                                            s,
                                                            v6_tried,
                                                            true,
                                                            ret);
           }
           if (mhd_SKT_IP_V4_WITH_V6_OPT == sk_type)
           {
             (void) mhd_socket_close (sk);
             return create_bind_listen_stream_socket_inner (d,
                                                            s,
                                                            true,
                                                            false,
                                                            ret);
           }
 #endif /* HAVE_INET6 */
           break;
         }
       }
     }
     /* A valid listening socket is ready here */
 
     if (! is_non_block)
     {
       is_non_block = mhd_socket_nonblocking (sk);
       if (! is_non_block)
         mhd_LOG_MSG (d, MHD_SC_LISTEN_SOCKET_NONBLOCKING_FAILURE, \
                      "OS refused to make the listen socket non-blocking");
     }
 
     /* Set to the daemon only when the listening socket is fully ready */
     d->net.listen.fd = sk;
     d->net.listen.is_broken = false;
     switch (sk_type)
     {
     case mhd_SKT_UNKNOWN:
       d->net.listen.type = mhd_SOCKET_TYPE_UNKNOWN;
       break;
     case mhd_SKT_NON_IP:
       d->net.listen.type = mhd_SOCKET_TYPE_NON_IP;
       break;
     case mhd_SKT_UNIX:
       d->net.listen.type = mhd_SOCKET_TYPE_UNIX;
       break;
     case mhd_SKT_IP_V4_ONLY:
     case mhd_SKT_IP_V6_ONLY:
     case mhd_SKT_IP_DUAL_REQUIRED:
     case mhd_SKT_IP_V4_WITH_V6_OPT:
     case mhd_SKT_IP_V6_WITH_V4_OPT:
     case mhd_SKT_IP_V4_WITH_FALLBACK:
       d->net.listen.type = mhd_SOCKET_TYPE_IP;
       break;
     case mhd_SKT_NO_SOCKET:
     default:
       mhd_UNREACHABLE ();
       return MHD_SC_INTERNAL_ERROR;
     }
     d->net.listen.non_block = is_non_block;
     d->net.listen.port = sk_port;
 
     mhd_assert (ret == MHD_SC_OK);
 
     return MHD_SC_OK;
 
   } while (0);
 
   mhd_assert (MHD_SC_OK != ret); /* This should be only error returns here */
   mhd_assert (MHD_INVALID_SOCKET != sk);
   (void) mhd_socket_close (sk);
   return ret;
 }
 
 
 /**
  * Create socket, bind to the address and start listening on the socket.
  *
  * The socket is assigned to the daemon as listening FD.
  *
  * @param d the daemon to use
  * @param s the user settings
  * @return #MHD_SC_OK on success,
  *         the error code otherwise (no error printed to log if result is
  *         #MHD_SC_LISTEN_SOCKET_BIND_FAILED or #MHD_SC_LISTEN_FAILURE)
  */
 static enum MHD_StatusCode
 create_bind_listen_stream_socket (struct MHD_Daemon *restrict d,
                                   struct DaemonOptions *restrict s)
 {
   enum MHD_StatusCode ret;
 
   ret = create_bind_listen_stream_socket_inner (d,
                                                 s,
                                                 false,
                                                 false,
                                                 MHD_SC_OK);
 #ifdef MHD_SUPPORT_LOG_FUNCTIONALITY
   if (MHD_SC_LISTEN_SOCKET_BIND_FAILED == ret)
     mhd_LOG_MSG (d, MHD_SC_LISTEN_SOCKET_BIND_FAILED, \
                  "Failed to bind the listen socket");
   else if (MHD_SC_LISTEN_FAILURE == ret)
     mhd_LOG_MSG (d, MHD_SC_LISTEN_FAILURE, \
                  "Failed to start listening on the listen socket");
 #endif /* MHD_SUPPORT_LOG_FUNCTIONALITY */
 
   return ret;
 }
 
 
 #ifdef MHD_USE_GETSOCKNAME
 /**
  * Detect and set the type and port of the listening socket
  * @param d the daemon to use
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 detect_listen_type_and_port (struct MHD_Daemon *restrict d)
 {
   union mhd_SockaddrAny sa_all;
   socklen_t sa_size;
   enum mhd_SocketType declared_type;
 
   mhd_assert (MHD_INVALID_SOCKET != d->net.listen.fd);
   mhd_assert (0 == d->net.listen.port);
   memset (&sa_all, 0, sizeof(sa_all)); /* Actually not required */
   sa_size = (socklen_t) sizeof(sa_all);
 
   if (0 != getsockname (d->net.listen.fd, &(sa_all.sa), &sa_size))
   {
     if (mhd_SOCKET_TYPE_IP == d->net.listen.type)
       mhd_LOG_MSG (d, MHD_SC_LISTEN_PORT_DETECT_FAILURE, \
                    "Failed to detect the port number on the listening socket");
     return;
   }
 
   declared_type = d->net.listen.type;
   if (0 == sa_size)
   {
 #ifndef __linux__
     /* Used on some non-Linux platforms */
     d->net.listen.type = mhd_SOCKET_TYPE_UNIX;
     d->net.listen.port = 0;
 #else  /* ! __linux__ */
     (void) 0;
 #endif /* ! __linux__ */
   }
   else
   {
     switch (sa_all.sa.sa_family)
     {
     case AF_INET:
       d->net.listen.type = mhd_SOCKET_TYPE_IP;
       d->net.listen.port = (uint_least16_t) ntohs (sa_all.sa_i4.sin_port);
       break;
 #ifdef HAVE_INET6
     case AF_INET6:
       d->net.listen.type = mhd_SOCKET_TYPE_IP;
       d->net.listen.port = (uint_least16_t) ntohs (sa_all.sa_i6.sin6_port);
       break;
 #endif /* HAVE_INET6 */
 #ifdef MHD_AF_UNIX
     case MHD_AF_UNIX:
       d->net.listen.type = mhd_SOCKET_TYPE_UNIX;
       d->net.listen.port = 0;
       break;
 #endif /* MHD_AF_UNIX */
     default:
       d->net.listen.type = mhd_SOCKET_TYPE_UNKNOWN;
       d->net.listen.port = 0;
       break;
     }
   }
 
   if ((declared_type != d->net.listen.type)
       && (mhd_SOCKET_TYPE_IP == declared_type))
     mhd_LOG_MSG (d, MHD_SC_UNEXPECTED_SOCKET_ERROR, \
                  "The type of listen socket is detected as non-IP, while " \
                  "the socket has been created as an IP socket");
 }
 
 
 #else
 #  define detect_listen_type_and_port(d) ((void) d)
 #endif
 
 
 #ifdef MHD_SUPPORT_EPOLL
 
 /**
  * Initialise daemon's epoll FD
  * The could be performed early to probe for epoll FD presence
  * or, normally, during worker initialisation
  * @param d the daemon object
  * @param early_probing 'true' if this is early epoll probing
  * @param log_failures set to true if errors logging should be suppressed
  *                     when fallback options exist
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) enum MHD_StatusCode
 init_epoll_fd (struct MHD_Daemon *restrict d,
                bool early_probing,
                bool log_failures)
 {
   int e_fd;
   mhd_ASSUME (early_probing || log_failures);
   mhd_assert ((mhd_POLL_TYPE_EPOLL == d->events.poll_type) ||
               (mhd_POLL_TYPE_NOT_SET_YET == d->events.poll_type));
   mhd_assert (! mhd_WM_INT_IS_THREAD_PER_CONN (d->wmode_int));
   mhd_assert (early_probing || d->dbg.net_inited);
   mhd_assert (! early_probing || ! d->dbg.net_inited);
   mhd_assert ((mhd_POLL_TYPE_EPOLL != d->events.poll_type) || \
               (NULL == d->events.data.epoll.events));
 
   if (! early_probing)
   {
     /* Full events initialisation */
     mhd_ASSUME (mhd_POLL_TYPE_EPOLL == d->events.poll_type);
     if (! mhd_D_HAS_MASTER (d))
     {
       mhd_assert (0 < d->events.data.epoll.early_fd);
       /* Move early initialised epoll FD */
       d->events.data.epoll.e_fd = d->events.data.epoll.early_fd;
       d->events.data.epoll.early_fd = MHD_INVALID_SOCKET;
       return MHD_SC_OK;
     }
 #ifdef MHD_SUPPORT_THREADS
     else
     {
       /* Worker daemon */
       int early_fd;
 
       early_fd = d->threading.hier.master->events.data.epoll.early_fd;
 
       /* Move early initialised epoll FD if it is not yet taken */
       if (MHD_INVALID_SOCKET != early_fd)
       {
         d->events.data.epoll.e_fd = early_fd;
         d->threading.hier.master->events.data.epoll.early_fd =
           MHD_INVALID_SOCKET;
         return MHD_SC_OK;
       }
       /* Process with new epoll FD creation */
     }
 #endif /* MHD_SUPPORT_THREADS */
   }
   else
     mhd_ASSUME (mhd_POLL_TYPE_NOT_SET_YET == d->events.poll_type);
 
 #ifdef HAVE_EPOLL_CREATE1
   e_fd = epoll_create1 (EPOLL_CLOEXEC);
 #else  /* ! HAVE_EPOLL_CREATE1 */
   e_fd = epoll_create (128); /* The number is usually ignored */
   if (0 <= e_fd)
   {
     if (! mhd_socket_noninheritable (e_fd))
       mhd_LOG_MSG (d, MHD_SC_EPOLL_CTL_CONFIGURE_NOINHERIT_FAILED, \
                    "Failed to make epoll control FD non-inheritable");
   }
 #endif /* ! HAVE_EPOLL_CREATE1 */
   if (0 > e_fd)
   {
     if (log_failures)
       mhd_LOG_MSG (d, MHD_SC_EPOLL_CTL_CREATE_FAILED, \
                    "Failed to create epoll control FD");
     return MHD_SC_EPOLL_CTL_CREATE_FAILED; /* Failure exit point */
   }
 
   if (! mhd_FD_FITS_DAEMON (d, e_fd))
   {
     if (log_failures)
       mhd_LOG_MSG (d, MHD_SC_EPOLL_CTL_OUTSIDE_OF_SET_RANGE, \
                    "The epoll control FD value is higher than allowed");
     (void) close (e_fd);
     return MHD_SC_EPOLL_CTL_OUTSIDE_OF_SET_RANGE; /* Failure exit point */
   }
 
   /* Needs to be set here as setting epoll data member 'early_fd' */
   d->events.poll_type = mhd_POLL_TYPE_EPOLL;
   if (! early_probing)
     d->events.data.epoll.e_fd = e_fd;
   else
     d->events.data.epoll.early_fd = e_fd;
 
   return MHD_SC_OK; /* Success exit point */
 }
 
 
 /**
  * Deinitialise daemon's epoll FD
  * @param d the daemon object
  */
 MHD_FN_PAR_NONNULL_ (1) static void
 deinit_epoll_fd (struct MHD_Daemon *restrict d)
 {
   mhd_assert (mhd_POLL_TYPE_EPOLL == d->events.poll_type);
   mhd_assert (MHD_INVALID_SOCKET != d->events.data.epoll.e_fd);
   mhd_assert (MHD_INVALID_SOCKET == d->events.data.epoll.early_fd);
   close (d->events.data.epoll.e_fd);
 }
 
 
 #endif /* MHD_SUPPORT_EPOLL */
 
 
 /**
  * Choose sockets monitoring syscall and pre-initialise it
  * @param d the daemon object
  * @param s the user settings
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) MHD_FN_PAR_NONNULL_ (2) \
   MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 daemon_choose_and_preinit_events (struct MHD_Daemon *restrict d,
                                   struct DaemonOptions *restrict s)
 {
   enum mhd_IntPollType chosen_type;
 
   mhd_assert (mhd_POLL_TYPE_NOT_SET_YET == d->events.poll_type);
 
   mhd_assert ((mhd_WM_INT_EXTERNAL_EVENTS_EDGE != d->wmode_int) || \
               (mhd_WM_INT_EXTERNAL_EVENTS_LEVEL != d->wmode_int) || \
               (MHD_SPS_AUTO == s->poll_syscall));
 
   /* Check whether the provided parameter is in the range of expected values.
      Reject unsupported or disabled values. */
   switch (s->poll_syscall)
   {
   case MHD_SPS_AUTO:
     chosen_type = mhd_POLL_TYPE_NOT_SET_YET;
     break;
   case MHD_SPS_SELECT:
     mhd_assert (! mhd_WM_INT_HAS_EXT_EVENTS (d->wmode_int));
 #ifndef MHD_SUPPORT_SELECT
     mhd_LOG_MSG (d, MHD_SC_SELECT_SYSCALL_NOT_AVAILABLE, \
                  "'select()' is not supported by the platform or " \
                  "this MHD build");
     return MHD_SC_SELECT_SYSCALL_NOT_AVAILABLE;
 #else  /* MHD_SUPPORT_SELECT */
     chosen_type = mhd_POLL_TYPE_SELECT;
 #endif /* MHD_SUPPORT_SELECT */
     break;
   case MHD_SPS_POLL:
     mhd_assert (! mhd_WM_INT_HAS_EXT_EVENTS (d->wmode_int));
 #ifndef MHD_SUPPORT_POLL
     mhd_LOG_MSG (d, MHD_SC_POLL_SYSCALL_NOT_AVAILABLE, \
                  "'poll()' is not supported by the platform or " \
                  "this MHD build");
     return MHD_SC_POLL_SYSCALL_NOT_AVAILABLE;
 #else  /* MHD_SUPPORT_POLL */
     chosen_type = mhd_POLL_TYPE_POLL;
 #endif /* MHD_SUPPORT_POLL */
     break;
   case MHD_SPS_EPOLL:
     mhd_assert (! mhd_WM_INT_HAS_EXT_EVENTS (d->wmode_int));
     mhd_assert (! mhd_WM_INT_IS_THREAD_PER_CONN (d->wmode_int));
 #ifndef MHD_SUPPORT_EPOLL
     mhd_LOG_MSG (d, MHD_SC_EPOLL_SYSCALL_NOT_AVAILABLE, \
                  "'epoll' is not supported by the platform or " \
                  "this MHD build");
     return MHD_SC_EPOLL_SYSCALL_NOT_AVAILABLE;
 #else  /* MHD_SUPPORT_EPOLL */
     chosen_type = mhd_POLL_TYPE_EPOLL;
 #endif /* MHD_SUPPORT_EPOLL */
     break;
   case MHD_SPS_KQUEUE:
     mhd_assert (! mhd_WM_INT_HAS_EXT_EVENTS (d->wmode_int));
     mhd_assert (! mhd_WM_INT_IS_THREAD_PER_CONN (d->wmode_int));
 #ifndef MHD_SUPPORT_KQUEUE
     mhd_LOG_MSG (d, MHD_SC_KQUEUE_SYSCALL_NOT_AVAILABLE, \
                  "'kqueue' is not supported by the platform or " \
                  "this MHD build");
     return MHD_SC_KQUEUE_SYSCALL_NOT_AVAILABLE;
 #else  /* MHD_SUPPORT_EPOLL */
     chosen_type = mhd_POLL_TYPE_KQUEUE;
 #endif /* MHD_SUPPORT_EPOLL */
     break;
   default:
     mhd_LOG_MSG (d, MHD_SC_CONFIGURATION_UNEXPECTED_SPS,
                  "Wrong socket polling syscall specified");
     return MHD_SC_CONFIGURATION_UNEXPECTED_SPS;
   }
 
 #ifdef MHD_SUPPORT_HTTPS
   if ((mhd_WM_INT_EXTERNAL_EVENTS_EDGE == (d)->wmode_int) ||
       mhd_POLL_TYPE_INT_IS_EDGE_TRIG (chosen_type))
   { /* Edge-triggered polling chosen */
     if (MHD_TLS_BACKEND_NONE != s->tls)
     {
       if (! mhd_tls_is_edge_trigg_supported (s))
       {
 #ifdef MHD_SUPPORT_LOG_FUNCTIONALITY
         if (MHD_TLS_BACKEND_ANY == s->tls)
           mhd_LOG_MSG (d, MHD_SC_TLS_BACKEND_DAEMON_INCOMPATIBLE_SETTINGS, \
                        "Edge-triggered sockets polling cannot be used "
                        "with available TLS backends");
         else
           mhd_LOG_MSG (d, MHD_SC_TLS_BACKEND_DAEMON_INCOMPATIBLE_SETTINGS, \
                        "Edge-triggered sockets polling cannot be used "
                        "with selected TLS backend");
 #endif /* MHD_SUPPORT_LOG_FUNCTIONALITY */
         return MHD_SC_TLS_BACKEND_DAEMON_INCOMPATIBLE_SETTINGS;
       }
     }
   }
 #endif /* MHD_SUPPORT_HTTPS */
 
   mhd_assert (mhd_POLL_TYPE_EXT != chosen_type);
   mhd_ASSUME ((mhd_POLL_TYPE_NOT_SET_YET != chosen_type) || \
               (MHD_SPS_AUTO == s->poll_syscall));
 
   if (mhd_POLL_TYPE_NOT_SET_YET == chosen_type)
   {
     if (mhd_WM_INT_HAS_EXT_EVENTS (d->wmode_int))
       chosen_type = mhd_POLL_TYPE_EXT;
   }
 
 #if defined(MHD_SUPPORT_EPOLL) || defined(MHD_SUPPORT_KQUEUE)
   /* Try edge-triggered polling */
   if ((mhd_POLL_TYPE_NOT_SET_YET == chosen_type)
       || mhd_POLL_TYPE_INT_IS_KQUEUE (chosen_type)
       || mhd_POLL_TYPE_INT_IS_EPOLL (chosen_type))
   {
     bool et_allowed;
 
     et_allowed = true;
     if (mhd_WM_INT_IS_THREAD_PER_CONN (d->wmode_int))
     {
       mhd_assert (! mhd_POLL_TYPE_INT_IS_KQUEUE (chosen_type));
       mhd_assert (! mhd_POLL_TYPE_INT_IS_EPOLL (chosen_type));
       et_allowed = false;
     }
 #  ifdef MHD_SUPPORT_HTTPS
     else if (MHD_TLS_BACKEND_NONE != s->tls)
       et_allowed = mhd_tls_is_edge_trigg_supported (s);
 #  endif /* MHD_SUPPORT_HTTPS */
 
     if (et_allowed)
     {
       mhd_ASSUME ((mhd_POLL_TYPE_NOT_SET_YET == chosen_type)
                   || mhd_POLL_TYPE_INT_IS_KQUEUE (chosen_type)
                   || mhd_POLL_TYPE_INT_IS_EPOLL (chosen_type));
 
 #  if defined(MHD_SUPPORT_KQUEUE)
       if ((mhd_POLL_TYPE_NOT_SET_YET == chosen_type)
           || mhd_POLL_TYPE_INT_IS_KQUEUE (chosen_type))
         chosen_type = mhd_POLL_TYPE_KQUEUE; /* No need to perform additional checking here */
 #  endif /* MHD_SUPPORT_KQUEUE */
 #  ifdef MHD_SUPPORT_EPOLL
       if ((mhd_POLL_TYPE_NOT_SET_YET == chosen_type)
           || mhd_POLL_TYPE_INT_IS_EPOLL (chosen_type))
       {
         /* epoll - need to be probed here as it can be disabled in kernel */
         enum MHD_StatusCode epoll_res;
         epoll_res = init_epoll_fd (d,
                                    true,
                                    mhd_POLL_TYPE_INT_IS_EPOLL (chosen_type));
         if (MHD_SC_OK != epoll_res)
         {
           if (mhd_POLL_TYPE_INT_IS_EPOLL (chosen_type))
             return epoll_res;
           mhd_assert (mhd_POLL_TYPE_NOT_SET_YET == chosen_type);
         }
         else
           chosen_type = mhd_POLL_TYPE_EPOLL;
       }
 #  endif /* ! MHD_SUPPORT_EPOLL */
     }
     else
       mhd_assert (mhd_POLL_TYPE_NOT_SET_YET == chosen_type);
   }
 #  ifdef MHD_SUPPORT_EPOLL
   mhd_assert ((mhd_POLL_TYPE_EPOLL != d->events.poll_type) || \
               (0 < d->events.data.epoll.early_fd));
   mhd_assert ((mhd_POLL_TYPE_EPOLL == d->events.poll_type) == \
               (mhd_POLL_TYPE_EPOLL == chosen_type));
 #  endif /* ! MHD_SUPPORT_EPOLL */
 #endif /* ! MHD_SUPPORT_EPOLL */
 
   if (mhd_POLL_TYPE_NOT_SET_YET == chosen_type)
   {
 #if defined(MHD_SUPPORT_POLL)
     chosen_type = mhd_POLL_TYPE_POLL;
 #elif defined(MHD_SUPPORT_SELECT)
     chosen_type = mhd_POLL_TYPE_SELECT;
 #else
     mhd_LOG_MSG (d, MHD_SC_FEATURE_DISABLED, \
                  "All suitable internal sockets polling technologies are " \
                  "disabled in this MHD build");
     return MHD_SC_FEATURE_DISABLED;
 #endif
   }
 
   switch (chosen_type)
   {
   case mhd_POLL_TYPE_EXT:
     mhd_assert ((MHD_WM_EXTERNAL_EVENT_LOOP_CB_LEVEL == s->work_mode.mode) || \
                 (MHD_WM_EXTERNAL_EVENT_LOOP_CB_EDGE == s->work_mode.mode));
     mhd_assert (mhd_WM_INT_HAS_EXT_EVENTS (d->wmode_int));
     d->events.poll_type = mhd_POLL_TYPE_EXT;
     d->events.data.extr.cb_data.cb =
       s->work_mode.params.v_external_event_loop_cb.reg_cb;
     d->events.data.extr.cb_data.cls =
       s->work_mode.params.v_external_event_loop_cb.reg_cb_cls;
     d->events.data.extr.reg_all = (MHD_NO != s->reregister_all);
 #ifdef MHD_SUPPORT_THREADS
     d->events.data.extr.itc_data.app_cntx = NULL;
 #endif /* MHD_SUPPORT_THREADS */
     d->events.data.extr.listen_data.app_cntx = NULL;
     break;
 #ifdef MHD_SUPPORT_SELECT
   case mhd_POLL_TYPE_SELECT:
     mhd_assert (! mhd_WM_INT_HAS_EXT_EVENTS (d->wmode_int));
     mhd_assert (MHD_WM_EXTERNAL_SINGLE_FD_WATCH != s->work_mode.mode);
     mhd_assert (MHD_WM_EXTERNAL_EVENT_LOOP_CB_LEVEL != s->work_mode.mode);
     mhd_assert (MHD_WM_EXTERNAL_EVENT_LOOP_CB_EDGE != s->work_mode.mode);
     mhd_assert (MHD_NO == s->reregister_all);
     d->events.poll_type = mhd_POLL_TYPE_SELECT;
     d->events.data.select.rfds = NULL; /* Memory allocated during event and threads init */
     d->events.data.select.wfds = NULL; /* Memory allocated during event and threads init */
     d->events.data.select.efds = NULL; /* Memory allocated during event and threads init */
     break;
 #endif /* MHD_SUPPORT_SELECT */
 #ifdef MHD_SUPPORT_POLL
   case mhd_POLL_TYPE_POLL:
     mhd_assert (! mhd_WM_INT_HAS_EXT_EVENTS (d->wmode_int));
     mhd_assert (MHD_WM_EXTERNAL_SINGLE_FD_WATCH != s->work_mode.mode);
     mhd_assert (MHD_WM_EXTERNAL_EVENT_LOOP_CB_LEVEL != s->work_mode.mode);
     mhd_assert (MHD_WM_EXTERNAL_EVENT_LOOP_CB_EDGE != s->work_mode.mode);
     mhd_assert (MHD_NO == s->reregister_all);
     d->events.poll_type = mhd_POLL_TYPE_POLL;
     d->events.data.poll.fds = NULL; /* Memory allocated during event and threads init */
     d->events.data.poll.rel = NULL; /* Memory allocated during event and threads init */
     break;
 #endif /* MHD_SUPPORT_POLL */
 #ifdef MHD_SUPPORT_EPOLL
   case mhd_POLL_TYPE_EPOLL:
     mhd_assert (! mhd_WM_INT_HAS_EXT_EVENTS (d->wmode_int));
     mhd_assert (MHD_WM_EXTERNAL_EVENT_LOOP_CB_LEVEL != s->work_mode.mode);
     mhd_assert (MHD_WM_EXTERNAL_EVENT_LOOP_CB_EDGE != s->work_mode.mode);
     mhd_assert (MHD_NO == s->reregister_all);
     /* Pre-initialised by init_epoll_fd() */
     mhd_assert (mhd_POLL_TYPE_EPOLL == d->events.poll_type);
     mhd_assert (0 <= d->events.data.epoll.early_fd);
     d->events.data.epoll.events = NULL; /* Memory allocated during event and threads init */
     d->events.data.epoll.num_elements = 0;
     break;
 #endif /* MHD_SUPPORT_EPOLL */
 #ifdef MHD_SUPPORT_KQUEUE
   case mhd_POLL_TYPE_KQUEUE:
     mhd_assert (! mhd_WM_INT_HAS_EXT_EVENTS (d->wmode_int));
     mhd_assert (MHD_WM_EXTERNAL_EVENT_LOOP_CB_LEVEL != s->work_mode.mode);
     mhd_assert (MHD_WM_EXTERNAL_EVENT_LOOP_CB_EDGE != s->work_mode.mode);
     mhd_assert (MHD_NO == s->reregister_all);
     d->events.poll_type = mhd_POLL_TYPE_KQUEUE;
     d->events.data.kq.kq_fd = -1;
     d->events.data.kq.kes = NULL;
     d->events.data.kq.num_elements = 0u;
     break;
 #endif /* MHD_SUPPORT_KQUEUE */
 #ifndef MHD_SUPPORT_SELECT
   case mhd_POLL_TYPE_SELECT:
 #endif /* ! MHD_SUPPORT_SELECT */
 #ifndef MHD_SUPPORT_POLL
   case mhd_POLL_TYPE_POLL:
 #endif /* ! MHD_SUPPORT_POLL */
   case mhd_POLL_TYPE_NOT_SET_YET:
   default:
     mhd_UNREACHABLE ();
     return MHD_SC_INTERNAL_ERROR;
   }
   return MHD_SC_OK;
 }
 
 
 /**
  * Initialise network/sockets for the daemon.
  * Also choose events mode / sockets polling syscall.
  * @param d the daemon object
  * @param s the user settings
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) MHD_FN_PAR_NONNULL_ (2) \
   MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 daemon_init_net (struct MHD_Daemon *restrict d,
                  struct DaemonOptions *restrict s)
 {
   enum MHD_StatusCode ret;
 
   mhd_assert (! d->dbg.net_inited);
   mhd_assert (! d->dbg.net_deinited);
 #ifdef MHD_SOCKETS_KIND_POSIX
   d->net.cfg.max_fd_num = s->fd_number_limit;
 #endif /* MHD_SOCKETS_KIND_POSIX */
 
   ret = daemon_choose_and_preinit_events (d, s);
   if (MHD_SC_OK != ret)
     return ret;
 
   mhd_assert (mhd_POLL_TYPE_NOT_SET_YET != d->events.poll_type);
 
   /* No direct return of error codes is allowed beyond this point.
      Deinit/cleanup must be performed before return of any error. */
 
 #if defined(MHD_SOCKETS_KIND_POSIX) && defined(MHD_SUPPORT_SELECT)
   if (mhd_POLL_TYPE_SELECT == d->events.poll_type)
   {
     if ((MHD_INVALID_SOCKET == d->net.cfg.max_fd_num) ||
         (FD_SETSIZE < d->net.cfg.max_fd_num))
       d->net.cfg.max_fd_num = FD_SETSIZE;
   }
 #endif /* MHD_SOCKETS_KIND_POSIX && MHD_SUPPORT_SELECT */
 
   if (MHD_SC_OK == ret)
   {
     ret = create_bind_listen_stream_socket (d, s);
 
     if (MHD_SC_OK == ret)
     {
       if ((MHD_INVALID_SOCKET != d->net.listen.fd)
           && ! d->net.listen.non_block
           && (mhd_D_HAS_EDGE_TRIGG (d) ||
               mhd_WM_INT_IS_THREAD_POOL (d->wmode_int)))
       {
         mhd_LOG_MSG (d, MHD_SC_LISTEN_SOCKET_NONBLOCKING_FAILURE, \
                      "The selected daemon work mode requires listening socket "
                      "in non-blocking mode");
         ret = MHD_SC_LISTEN_SOCKET_NONBLOCKING_FAILURE;
       }
 
       if (MHD_SC_OK == ret)
       {
         if ((MHD_INVALID_SOCKET != d->net.listen.fd) &&
             ((0 == d->net.listen.port) ||
              (mhd_SOCKET_TYPE_UNKNOWN == d->net.listen.type)))
           detect_listen_type_and_port (d);
 
 #ifndef NDEBUG
         d->dbg.net_inited = true;
 #endif
         return MHD_SC_OK; /* Success exit point */
       }
 
       /* Below is a cleanup path */
       if (MHD_INVALID_SOCKET != d->net.listen.fd)
         mhd_socket_close (d->net.listen.fd);
     }
   }
 
 #ifdef MHD_SUPPORT_EPOLL
   /* Special case for epoll: epoll FD is probed early in events
      pre-initialisation and is not moved to events epoll FD therefore
      it needs cleanup here */
   if (mhd_POLL_TYPE_EPOLL == d->events.poll_type)
   {
     mhd_assert (MHD_INVALID_SOCKET != d->events.data.epoll.early_fd);
     close (d->events.data.epoll.early_fd);
   }
 #endif /* MHD_SUPPORT_EPOLL */
 
   mhd_assert (MHD_SC_OK != ret);
 
   return ret;
 }
 
 
 /**
  * Deinitialise daemon's network data
  * @param d the daemon object
  */
 MHD_FN_PAR_NONNULL_ (1) static void
 daemon_deinit_net (struct MHD_Daemon *restrict d)
 {
   mhd_assert (d->dbg.net_inited);
   mhd_assert (! d->dbg.net_deinited);
   mhd_assert (mhd_POLL_TYPE_NOT_SET_YET != d->events.poll_type);
 #ifdef MHD_SUPPORT_EPOLL
   /* Special case for epoll: epoll FD is probed early in events
      pre-initialisation and could be not moved yet to events epoll FD
      therefore it needs cleanup here */
   if ((mhd_POLL_TYPE_EPOLL == d->events.poll_type) &&
       (MHD_INVALID_SOCKET != d->events.data.epoll.early_fd))
   {
     mhd_assert (0 < d->events.data.epoll.early_fd);
     close (d->events.data.epoll.early_fd);
   }
 #endif /* MHD_SUPPORT_EPOLL */
   if (MHD_INVALID_SOCKET != d->net.listen.fd)
     mhd_socket_close (d->net.listen.fd);
 
 #ifndef NDEBUG
   d->dbg.net_deinited = true;
 #endif
 }
 
 
 #if 0
 void
 dauth_init (struct MHD_Daemon *restrict d,
             struct DaemonOptions *restrict s)
 {
   mhd_assert ((NULL == s->random_entropy.v_buf) || \
               (0 != s->random_entropy.v_buf_size));
   mhd_assert ((0 == s->random_entropy.v_buf_size) || \
               (NULL != s->random_entropy.v_buf));
 }
 
 
 #endif
 
 #ifdef MHD_SUPPORT_AUTH_DIGEST
 /**
  * Initialise daemon Digest Auth data
  * @param d the daemon object
  * @param s the user settings
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) MHD_FN_PAR_NONNULL_ (2) \
   MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 daemon_init_auth_digest (struct MHD_Daemon *restrict d,
                          struct DaemonOptions *restrict s)
 {
   enum MHD_StatusCode ret;
   size_t nonces_num;
 
   if (0 == s->random_entropy.v_buf_size)
   {
     /* No initialisation needed */
 #ifndef HAVE_NULL_PTR_ALL_ZEROS
     d->auth_dg.entropy.data = NULL;
     d->auth_dg.nonces = NULL;
 #endif
     return MHD_SC_OK;
   }
   nonces_num = s->auth_digest_map_size;
   if (0 == nonces_num)
     nonces_num = 1000;
   d->auth_dg.nonces = (struct mhd_DaemonAuthDigestNonceData *)
                       mhd_calloc (nonces_num, \
                                   sizeof(struct mhd_DaemonAuthDigestNonceData));
   if (NULL == d->auth_dg.nonces)
   {
     mhd_LOG_MSG (d, \
                  MHD_SC_DAEMON_MEM_ALLOC_FAILURE, \
                  "Failed to allocate memory for Digest Auth array");
     return MHD_SC_DAEMON_MEM_ALLOC_FAILURE;
   }
   d->auth_dg.cfg.nonces_num = nonces_num;
 
   if (! mhd_mutex_init (&(d->auth_dg.nonces_lock)))
   {
     mhd_LOG_MSG (d, MHD_SC_MUTEX_INIT_FAILURE, \
                  "Failed to initialise mutex for the Digest Auth data");
     ret = MHD_SC_MUTEX_INIT_FAILURE;
   }
   else
   {
     if (! mhd_atomic_counter_init (&(d->auth_dg.num_gen_nonces), 0))
     {
       mhd_LOG_MSG (d, MHD_SC_MUTEX_INIT_FAILURE, \
                    "Failed to initialise mutex for the Digest Auth data");
       ret = MHD_SC_MUTEX_INIT_FAILURE;
     }
     else
     {
       /* Move ownership of the entropy buffer */
       d->auth_dg.entropy.data = (char *) s->random_entropy.v_buf;
       d->auth_dg.entropy.size = s->random_entropy.v_buf_size;
       s->random_entropy.v_buf = NULL;
       s->random_entropy.v_buf_size = 0;
 
       d->auth_dg.cfg.nonce_tmout = s->auth_digest_nonce_timeout;
       if (0 == d->auth_dg.cfg.nonce_tmout)
         d->auth_dg.cfg.nonce_tmout = MHD_AUTH_DIGEST_DEF_TIMEOUT;
       d->auth_dg.cfg.def_max_nc = s->auth_digest_def_max_nc;
       if (0 == d->auth_dg.cfg.def_max_nc)
         d->auth_dg.cfg.def_max_nc = MHD_AUTH_DIGEST_DEF_MAX_NC;
 
       return MHD_SC_OK; /* Success exit point */
     }
     mhd_mutex_destroy_chk (&(d->auth_dg.nonces_lock));
   }
 
   free (d->auth_dg.nonces);
   mhd_assert (MHD_SC_OK != ret);
   return ret; /* Failure exit point */
 }
 
 
 /**
  * Deinitialise daemon Digest Auth data
  * @param d the daemon object
  */
 MHD_FN_PAR_NONNULL_ (1) static void
 daemon_deinit_auth_digest (struct MHD_Daemon *restrict d)
 {
   if (0 == d->auth_dg.entropy.size)
     return; /* Digest Auth not used, nothing to deinitialise */
 
   mhd_assert (NULL != d->auth_dg.entropy.data);
   free (d->auth_dg.entropy.data);
   mhd_atomic_counter_deinit (&(d->auth_dg.num_gen_nonces));
   mhd_mutex_destroy_chk (&(d->auth_dg.nonces_lock));
   mhd_assert (NULL != d->auth_dg.nonces);
   free (d->auth_dg.nonces);
 }
 
 
 #else  /* MHD_SUPPORT_AUTH_DIGEST */
 #define daemon_init_auth_digest(d,s)  (MHD_SC_OK)
 #define daemon_deinit_auth_digest(d)  ((void) 0)
 #endif /* MHD_SUPPORT_AUTH_DIGEST */
 
 
 /**
  * Initialise daemon TLS data
  * @param d the daemon object
  * @param s the user settings
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) MHD_FN_PAR_NONNULL_ (2) \
   MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 daemon_init_tls (struct MHD_Daemon *restrict d,
                  struct DaemonOptions *restrict s)
 {
 #ifdef MHD_SUPPORT_HTTPS
   mhd_StatusCodeInt ret;
 #endif /* MHD_SUPPORT_HTTPS */
 
   mhd_assert (! d->dbg.tls_inited);
 #ifdef MHD_SUPPORT_HTTPS
   d->tls = NULL;
 #endif
 
   if (MHD_TLS_BACKEND_NONE == s->tls)
   {
 #ifndef NDEBUG
     d->dbg.tls_inited = true;
 #endif
     return MHD_SC_OK;
   }
 #ifndef MHD_SUPPORT_HTTPS
   mhd_LOG_MSG (d, \
                MHD_SC_TLS_DISABLED, \
                "HTTPS is not supported by this MHD build");
   return MHD_SC_TLS_DISABLED;
 #else  /* MHD_SUPPORT_HTTPS */
   if (1)
   {
     enum mhd_TlsBackendAvailable tls_avail;
 
     tls_avail = mhd_tls_is_backend_available (s);
     if (mhd_TLS_BACKEND_AVAIL_NOT_SUPPORTED == tls_avail)
     {
       mhd_LOG_MSG (d, \
                    MHD_SC_TLS_BACKEND_UNSUPPORTED, \
                    "The requested TLS backend is not supported " \
                    "by this MHD build");
       return MHD_SC_TLS_BACKEND_UNSUPPORTED;
     }
     else if (mhd_TLS_BACKEND_AVAIL_NOT_AVAILABLE == tls_avail)
     {
       mhd_LOG_MSG (d, \
                    MHD_SC_TLS_BACKEND_UNAVAILABLE, \
                    "The requested TLS backend is not available");
       return MHD_SC_TLS_BACKEND_UNAVAILABLE;
     }
   }
   ret = mhd_tls_daemon_init (d,
                              mhd_D_HAS_EDGE_TRIGG (d),
                              s,
                              &(d->tls));
   mhd_assert ((MHD_SC_OK == ret) || (NULL == d->tls));
   mhd_assert ((MHD_SC_OK != ret) || (NULL != d->tls));
 #ifndef NDEBUG
   d->dbg.tls_inited = (MHD_SC_OK == ret);
 #endif
   return (enum MHD_StatusCode) ret;
 #endif /* MHD_SUPPORT_HTTPS */
 }
 
 
 /**
  * Deinitialise daemon TLS data
  * @param d the daemon object
  */
 MHD_FN_PAR_NONNULL_ (1) static void
 daemon_deinit_tls (struct MHD_Daemon *restrict d)
 {
   mhd_assert (d->dbg.tls_inited);
 #ifdef MHD_SUPPORT_HTTPS
   if (NULL != d->tls)
   {
     mhd_tls_thread_cleanup (d->tls);
     mhd_tls_daemon_deinit (d->tls);
   }
 #elif defined(NDEBUG)
   (void) d; /* Mute compiler warning */
 #endif
 }
 
 
 /**
  * Initialise large buffer tracking.
  * @param d the daemon object
  * @param s the user settings
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) MHD_FN_PAR_NONNULL_ (2) \
   MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 daemon_init_large_buf (struct MHD_Daemon *restrict d,
                        struct DaemonOptions *restrict s)
 {
   mhd_assert (! mhd_D_HAS_MASTER (d));
   mhd_assert (0 != d->conns.cfg.count_limit);
   mhd_assert (0 != d->conns.cfg.mem_pool_size);
 
   d->req_cfg.large_buf.space_left = s->large_pool_size;
   if (SIZE_MAX == d->req_cfg.large_buf.space_left)
     d->req_cfg.large_buf.space_left =
       (d->conns.cfg.count_limit * d->conns.cfg.mem_pool_size) / 32;   /* Use ~3% of the maximum memory used by connections */
 
 #ifndef NDEBUG
   d->dbg.initial_lbuf_size = d->req_cfg.large_buf.space_left;
 #endif
 
   if (! mhd_mutex_init_short (&(d->req_cfg.large_buf.lock)))
   {
     mhd_LOG_MSG (d, MHD_SC_MUTEX_INIT_FAILURE, \
                  "Failed to initialise mutex for the global large buffer.");
     return MHD_SC_MUTEX_INIT_FAILURE;
   }
   return MHD_SC_OK;
 }
 
 
 /**
  * Deinitialise large buffer tracking.
  * @param d the daemon object
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 daemon_deinit_large_buf (struct MHD_Daemon *restrict d)
 {
   /* All large buffer allocations must be freed / deallocated earlier */
   mhd_assert (d->dbg.initial_lbuf_size == d->req_cfg.large_buf.space_left);
   mhd_mutex_destroy_chk (&(d->req_cfg.large_buf.lock));
 }
 
 
 #ifdef MHD_SUPPORT_KQUEUE
 
 /**
  * Initialise daemon's kqueue FD
  * @param d the daemon object
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) enum MHD_StatusCode
 init_kqueue_fd (struct MHD_Daemon *restrict d)
 {
   int kq_fd;
   mhd_assert (mhd_POLL_TYPE_KQUEUE == d->events.poll_type);
   mhd_assert (! mhd_WM_INT_IS_THREAD_PER_CONN (d->wmode_int));
   mhd_assert (d->dbg.net_inited);
   mhd_assert (MHD_INVALID_SOCKET == d->events.data.kq.kq_fd);
   mhd_assert (NULL == d->events.data.kq.kes);
   mhd_assert (0u == d->events.data.kq.num_elements);
 
   kq_fd = mhd_kqueue ();
   if (0 > kq_fd)
   {
     mhd_LOG_MSG (d, MHD_SC_KQUEUE_FD_CREATE_FAILED, \
                  "Failed to create kqueue FD");
     return MHD_SC_KQUEUE_FD_CREATE_FAILED; /* Failure exit point */
   }
 
   if (! mhd_FD_FITS_DAEMON (d, kq_fd))
   {
     mhd_LOG_MSG (d, MHD_SC_KQUEUE_FD_OUTSIDE_OF_SET_RANGE, \
                  "The kqueue FD value is higher than allowed");
     (void) close (kq_fd);
     return MHD_SC_KQUEUE_FD_OUTSIDE_OF_SET_RANGE; /* Failure exit point */
   }
 
   if (! mhd_KQUEUE_HAS_CLOEXEC_SET ())
   {
     if (! mhd_socket_noninheritable (kq_fd))
       mhd_LOG_MSG (d, MHD_SC_KQUEUE_FD_SET_NOINHERIT_FAILED, \
                    "Failed to make kqueue FD non-inheritable");
   }
   d->events.data.kq.kq_fd = kq_fd;
 
   return MHD_SC_OK; /* Success exit point */
 }
 
 
 /**
  * Deinitialise daemon's kqueue FD
  * @param d the daemon object
  */
 MHD_FN_PAR_NONNULL_ (1) static void
 deinit_kqueue_fd (struct MHD_Daemon *restrict d)
 {
   mhd_assert (mhd_POLL_TYPE_KQUEUE == d->events.poll_type);
   mhd_assert (0 < d->events.data.kq.kq_fd);
   close (d->events.data.kq.kq_fd);
 }
 
 
 #endif /* MHD_SUPPORT_KQUEUE */
 
 
 /**
  * Initialise daemon's events polling FD (if used by polling function)
  * @param d the daemon object
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 init_events_fd (struct MHD_Daemon *restrict d)
 {
   enum MHD_StatusCode res;
 
   res = MHD_SC_OK;
   switch (d->events.poll_type)
   {
   case mhd_POLL_TYPE_EXT:
     break;
 #ifdef MHD_SUPPORT_SELECT
   case mhd_POLL_TYPE_SELECT:
     break;
 #endif /* MHD_SUPPORT_SELECT */
 #ifdef MHD_SUPPORT_POLL
   case mhd_POLL_TYPE_POLL:
     break;
 #endif /* MHD_SUPPORT_POLL */
 #ifdef MHD_SUPPORT_EPOLL
   case mhd_POLL_TYPE_EPOLL:
     res = init_epoll_fd (d,
                          false,
                          true);
     break;
 #endif /* MHD_SUPPORT_EPOLL */
 #ifdef MHD_SUPPORT_KQUEUE
   case mhd_POLL_TYPE_KQUEUE:
     res = init_kqueue_fd (d);
     break;
 #endif /* MHD_SUPPORT_KQUEUE */
 #ifndef MHD_SUPPORT_SELECT
   case mhd_POLL_TYPE_SELECT:
 #endif /* ! MHD_SUPPORT_SELECT */
 #ifndef MHD_SUPPORT_POLL
   case mhd_POLL_TYPE_POLL:
 #endif /* ! MHD_SUPPORT_POLL */
   case mhd_POLL_TYPE_NOT_SET_YET:
   default:
     mhd_UNREACHABLE ();
     return MHD_SC_INTERNAL_ERROR;
   }
 
 #ifndef NDEBUG
   if (MHD_SC_OK == res)
     d->dbg.events_fd_inited = true;
 #endif /* ! NDEBUG */
 
   return res;
 }
 
 
 /**
  * Deinitialise daemon's events polling FD (if used by polling function)
  * @param d the daemon object
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 deinit_events_fd (struct MHD_Daemon *restrict d)
 {
   mhd_assert (d->dbg.events_fd_inited);
 
   switch (d->events.poll_type)
   {
   case mhd_POLL_TYPE_EXT:
     return;
 #ifdef MHD_SUPPORT_SELECT
   case mhd_POLL_TYPE_SELECT:
     return;
 #endif /* MHD_SUPPORT_SELECT */
 #ifdef MHD_SUPPORT_POLL
   case mhd_POLL_TYPE_POLL:
     return;
 #endif /* MHD_SUPPORT_POLL */
 #ifdef MHD_SUPPORT_EPOLL
   case mhd_POLL_TYPE_EPOLL:
     deinit_epoll_fd (d);
     return;
 #endif /* MHD_SUPPORT_EPOLL */
 #ifdef MHD_SUPPORT_KQUEUE
   case mhd_POLL_TYPE_KQUEUE:
     deinit_kqueue_fd (d);
     return;
 #endif /* MHD_SUPPORT_KQUEUE */
 #ifndef MHD_SUPPORT_SELECT
   case mhd_POLL_TYPE_SELECT:
 #endif /* ! MHD_SUPPORT_SELECT */
 #ifndef MHD_SUPPORT_POLL
   case mhd_POLL_TYPE_POLL:
 #endif /* ! MHD_SUPPORT_POLL */
   case mhd_POLL_TYPE_NOT_SET_YET:
   default:
     mhd_UNREACHABLE ();
   }
   return;
 }
 
 
 /**
  * Finish initialisation of events processing
  * @param d the daemon object
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 allocate_events (struct MHD_Daemon *restrict d)
 {
 #if defined(MHD_SUPPORT_POLL) || defined(MHD_SUPPORT_EPOLL)
   /**
    * The number of elements to be monitored by sockets polling function
    */
   unsigned int num_fd_elems;
   num_fd_elems = 0;
 #ifdef MHD_SUPPORT_THREADS
   ++num_fd_elems;  /* For the ITC */
 #endif
   if (MHD_INVALID_SOCKET != d->net.listen.fd)
     ++num_fd_elems;  /* For the listening socket */
   if (! mhd_D_HAS_THR_PER_CONN (d))
     num_fd_elems += d->conns.cfg.count_limit;
 #endif /* MHD_SUPPORT_POLL || MHD_SUPPORT_EPOLL */
 
   mhd_assert (0 != d->conns.cfg.count_limit);
   mhd_assert (mhd_D_TYPE_HAS_EVENTS_PROCESSING (d->threading.d_type));
   mhd_assert (! d->dbg.events_allocated);
 
   mhd_DLINKEDL_INIT_LIST (&(d->events),proc_ready);
 
   switch (d->events.poll_type)
   {
   case mhd_POLL_TYPE_EXT:
     mhd_assert (NULL != d->events.data.extr.cb_data.cb);
     /* Nothing to do: allocation is not needed */
 #ifndef NDEBUG
     d->dbg.events_allocated = true;
 #endif
     return MHD_SC_OK; /* Success exit point */
     break;
 #ifdef MHD_SUPPORT_SELECT
   case mhd_POLL_TYPE_SELECT:
     /* The pointers have been set to NULL during pre-initialisations of the events */
     mhd_assert (NULL == d->events.data.select.rfds);
     mhd_assert (NULL == d->events.data.select.wfds);
     mhd_assert (NULL == d->events.data.select.efds);
     d->events.data.select.rfds = (fd_set *) malloc (sizeof(fd_set));
     if (NULL != d->events.data.select.rfds)
     {
       d->events.data.select.wfds = (fd_set *) malloc (sizeof(fd_set));
       if (NULL != d->events.data.select.wfds)
       {
         d->events.data.select.efds = (fd_set *) malloc (sizeof(fd_set));
         if (NULL != d->events.data.select.efds)
         {
 #ifndef NDEBUG
           d->dbg.num_events_elements = FD_SETSIZE;
           d->dbg.events_allocated = true;
 #endif
           return MHD_SC_OK; /* Success exit point */
         }
 
         free (d->events.data.select.wfds);
       }
       free (d->events.data.select.rfds);
     }
     mhd_LOG_MSG (d, MHD_SC_EVENTS_MEMORY_ALLOCATE_FAILURE, \
                  "Failed to allocate memory for fd_sets for the daemon");
     return MHD_SC_EVENTS_MEMORY_ALLOCATE_FAILURE;
     break;
 #endif /* MHD_SUPPORT_SELECT */
 #ifdef MHD_SUPPORT_POLL
   case mhd_POLL_TYPE_POLL:
     /* The pointers have been set to NULL during pre-initialisations of the events */
     mhd_assert (NULL == d->events.data.poll.fds);
     mhd_assert (NULL == d->events.data.poll.rel);
     if ((num_fd_elems > d->conns.cfg.count_limit) /* Check for value overflow */
         || (mhd_D_HAS_THR_PER_CONN (d)))
     {
       d->events.data.poll.fds =
         (struct pollfd *) malloc (sizeof(struct pollfd) * num_fd_elems);
       if (NULL != d->events.data.poll.fds)
       {
         d->events.data.poll.rel =
           (union mhd_SocketRelation *) malloc (sizeof(union mhd_SocketRelation)
                                                * num_fd_elems);
         if (NULL != d->events.data.poll.rel)
         {
 #ifndef NDEBUG
           d->dbg.num_events_elements = num_fd_elems;
           d->dbg.events_allocated = true;
 #endif
           return MHD_SC_OK; /* Success exit point */
         }
         free (d->events.data.poll.fds);
       }
     }
     mhd_LOG_MSG (d, MHD_SC_EVENTS_MEMORY_ALLOCATE_FAILURE, \
                  "Failed to allocate memory for poll fds for the daemon");
     return MHD_SC_EVENTS_MEMORY_ALLOCATE_FAILURE;
     break;
 #endif /* MHD_SUPPORT_POLL */
 #ifdef MHD_SUPPORT_EPOLL
   case mhd_POLL_TYPE_EPOLL:
     mhd_ASSUME (! mhd_D_HAS_THR_PER_CONN (d));
     /* The event FD has been created by event FD initialisation */
     mhd_assert (MHD_INVALID_SOCKET != d->events.data.epoll.e_fd);
     mhd_assert (MHD_INVALID_SOCKET == d->events.data.epoll.early_fd);
     /* The pointer has been set to NULL during pre-initialisation of the events */
     mhd_assert (NULL == d->events.data.epoll.events);
     mhd_assert (0 == d->events.data.epoll.num_elements);
     if (1)
     {
       const unsigned int upper_limit = (sizeof(void*) >= 8) ? 4096u : 1024u;
 
       mhd_assert (0 < (int) upper_limit);
       mhd_assert (upper_limit == (unsigned int) (size_t) upper_limit);
 
       if (num_fd_elems < d->conns.cfg.count_limit) /* Check for value overflow */
         num_fd_elems = upper_limit;
       /* Trade neglectable performance penalty for memory saving */
       /* Very large amount of new events processed in batches */
       else if (num_fd_elems > upper_limit)
         num_fd_elems = upper_limit;
 
       d->events.data.epoll.events =
         (struct epoll_event *) malloc (sizeof(struct epoll_event)
                                        * num_fd_elems);
       if (NULL != d->events.data.epoll.events)
       {
         d->events.data.epoll.num_elements = num_fd_elems;
 #ifndef NDEBUG
         d->dbg.num_events_elements = num_fd_elems;
         d->dbg.events_allocated = true;
 #endif
         return MHD_SC_OK; /* Success exit point */
       }
     }
     mhd_LOG_MSG (d, MHD_SC_EVENTS_MEMORY_ALLOCATE_FAILURE, \
                  "Failed to allocate memory for epoll events for the daemon");
     return MHD_SC_EVENTS_MEMORY_ALLOCATE_FAILURE;
     break;
 #endif /* MHD_SUPPORT_EPOLL */
 #ifdef MHD_SUPPORT_KQUEUE
   case mhd_POLL_TYPE_KQUEUE:
     mhd_ASSUME (! mhd_D_HAS_THR_PER_CONN (d));
     /* The event FD has been created by event FD initialisation */
     mhd_assert (0 < d->events.data.kq.kq_fd);
     /* The pointer has been set to NULL during pre-initialisation of the events */
     mhd_assert (NULL == d->events.data.kq.kes);
     mhd_assert (0u == d->events.data.kq.num_elements);
     if (1)
     {
       const unsigned int upper_limit = (sizeof(void*) >= 8) ? 4096u : 1024u;
       unsigned int num_event_elems = 0;
 
       mhd_assert (0 < (int) upper_limit);
       mhd_assert (upper_limit == (unsigned int) (size_t) upper_limit);
 
 #ifdef MHD_SUPPORT_THREADS
       ++num_event_elems;  /* For the ITC */
 #endif
       if (MHD_INVALID_SOCKET != d->net.listen.fd)
         ++num_event_elems;  /* For the listening socket */
 
       /* kqueue needs slots for individual combinations of FD + filter (send/recv)  */
       num_event_elems += 2 * d->conns.cfg.count_limit;
       if (d->conns.cfg.count_limit > (num_event_elems / 2)) /* Check for overflow */
         num_event_elems = upper_limit;
       /* Trade neglectable performance penalty for memory saving */
       /* Very large amount of new events processed in batches */
       else if (upper_limit < num_event_elems)
         num_event_elems = upper_limit;
 
       /* Make sure that run-time overflow check is easy */
       mhd_assert (((int) num_event_elems) > 0);
       mhd_assert (((int) (num_event_elems + 1)) > 0);
 
       d->events.data.kq.kes =
         (struct kevent *) malloc (sizeof(struct kevent) * num_event_elems);
       if (NULL != d->events.data.kq.kes)
       {
         d->events.data.kq.num_elements = num_event_elems;
 #ifndef NDEBUG
         d->dbg.num_events_elements = num_event_elems;
         d->dbg.events_allocated = true;
 #endif
         return MHD_SC_OK; /* Success exit point */
       }
     }
     mhd_LOG_MSG (d, MHD_SC_EVENTS_MEMORY_ALLOCATE_FAILURE, \
                  "Failed to allocate memory for kqueue events for the daemon");
     return MHD_SC_EVENTS_MEMORY_ALLOCATE_FAILURE;
     break;
 #endif /* MHD_SUPPORT_KQUEUE */
 #ifndef MHD_SUPPORT_SELECT
   case mhd_POLL_TYPE_SELECT:
 #endif /* ! MHD_SUPPORT_SELECT */
 #ifndef MHD_SUPPORT_POLL
   case mhd_POLL_TYPE_POLL:
 #endif /* ! MHD_SUPPORT_POLL */
   case mhd_POLL_TYPE_NOT_SET_YET:
   default:
     mhd_UNREACHABLE ();
     break;
   }
   mhd_UNREACHABLE ();
   return MHD_SC_INTERNAL_ERROR;
 }
 
 
 /**
  * Deallocate events data
  * @param d the daemon object
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 deallocate_events (struct MHD_Daemon *restrict d)
 {
   mhd_assert (d->dbg.events_allocated);
   mhd_assert (0 != d->conns.cfg.count_limit);
   mhd_assert (mhd_D_TYPE_HAS_EVENTS_PROCESSING (d->threading.d_type));
   switch (d->events.poll_type)
   {
   case mhd_POLL_TYPE_EXT:
     break;
 #ifdef MHD_SUPPORT_SELECT
   case mhd_POLL_TYPE_SELECT:
     mhd_assert (NULL != d->events.data.select.efds);
     mhd_assert (NULL != d->events.data.select.wfds);
     mhd_assert (NULL != d->events.data.select.rfds);
     free (d->events.data.select.efds);
     free (d->events.data.select.wfds);
     free (d->events.data.select.rfds);
     break;
 #endif /* MHD_SUPPORT_SELECT */
 #ifdef MHD_SUPPORT_POLL
   case mhd_POLL_TYPE_POLL:
     mhd_assert (NULL != d->events.data.poll.rel);
     mhd_assert (NULL != d->events.data.poll.fds);
     free (d->events.data.poll.rel);
     free (d->events.data.poll.fds);
     break;
 #endif /* MHD_SUPPORT_POLL */
 #ifdef MHD_SUPPORT_EPOLL
   case mhd_POLL_TYPE_EPOLL:
     mhd_assert (0 != d->events.data.epoll.num_elements);
     mhd_assert (NULL != d->events.data.epoll.events);
     free (d->events.data.epoll.events);
     break;
 #endif /* MHD_SUPPORT_EPOLL */
 #ifdef MHD_SUPPORT_KQUEUE
   case mhd_POLL_TYPE_KQUEUE:
     mhd_assert (0 != d->events.data.kq.num_elements);
     mhd_assert (NULL != d->events.data.kq.kes);
     free (d->events.data.kq.kes);
     break;
 #endif /* MHD_SUPPORT_KQUEUE */
 #ifndef MHD_SUPPORT_SELECT
   case mhd_POLL_TYPE_SELECT:
 #endif /* ! MHD_SUPPORT_SELECT */
 #ifndef MHD_SUPPORT_POLL
   case mhd_POLL_TYPE_POLL:
 #endif /* ! MHD_SUPPORT_POLL */
   case mhd_POLL_TYPE_NOT_SET_YET:
   default:
     mhd_UNREACHABLE_D ("Wrong workflow");
   }
 #ifndef NDEBUG
   d->dbg.events_allocated = false;
 #endif
   return;
 }
 
 
 /**
  * Initialise daemon's ITC
  * @param d the daemon object
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 init_itc (struct MHD_Daemon *restrict d)
 {
   mhd_assert (mhd_D_TYPE_IS_VALID (d->threading.d_type));
   mhd_assert (mhd_D_TYPE_HAS_EVENTS_PROCESSING (d->threading.d_type));
 #ifdef MHD_SUPPORT_THREADS
   // TODO: add and process "thread unsafe" daemon's option
   if (! mhd_itc_init (&(d->threading.itc)))
   {
 #if defined(MHD_ITC_EVENTFD_)
     mhd_LOG_MSG ( \
       d, MHD_SC_ITC_INITIALIZATION_FAILED, \
       "Failed to initialise eventFD for inter-thread communication");
 #elif defined(MHD_ITC_PIPE_)
     mhd_LOG_MSG ( \
       d, MHD_SC_ITC_INITIALIZATION_FAILED, \
       "Failed to create a pipe for inter-thread communication");
 #elif defined(MHD_ITC_SOCKETPAIR_)
     mhd_LOG_MSG ( \
       d, MHD_SC_ITC_INITIALIZATION_FAILED, \
       "Failed to create a socketpair for inter-thread communication");
 #else
 #warning Missing expicit handling of the ITC type
     mhd_LOG_MSG ( \
       d, MHD_SC_ITC_INITIALIZATION_FAILED, \
       "Failed to initialise inter-thread communication");
 #endif
     return MHD_SC_ITC_INITIALIZATION_FAILED;
   }
   if (! mhd_FD_FITS_DAEMON (d,mhd_itc_r_fd (d->threading.itc)))
   {
     mhd_LOG_MSG (d, MHD_SC_ITC_FD_OUTSIDE_OF_SET_RANGE, \
                  "The inter-thread communication FD value is " \
                  "higher than allowed");
     (void) mhd_itc_destroy (d->threading.itc);
     mhd_itc_set_invalid (&(d->threading.itc));
     return MHD_SC_ITC_FD_OUTSIDE_OF_SET_RANGE;
   }
 #else  /* ! MHD_SUPPORT_THREADS */
   (void) d; /* Unused */
 #endif /* ! MHD_SUPPORT_THREADS */
   return MHD_SC_OK;
 }
 
 
 /**
  * Deallocate events data
  * @param d the daemon object
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 deinit_itc (struct MHD_Daemon *restrict d)
 {
   mhd_assert (mhd_D_TYPE_IS_VALID (d->threading.d_type));
   mhd_assert (mhd_D_TYPE_HAS_EVENTS_PROCESSING (d->threading.d_type));
 #ifdef MHD_SUPPORT_THREADS
   // TODO: add and process "thread unsafe" daemon's option
   mhd_assert (! mhd_ITC_IS_INVALID (d->threading.itc));
   (void) mhd_itc_destroy (d->threading.itc);
 #else  /* ! MHD_SUPPORT_THREADS */
   (void) d; /* Unused */
 #endif /* ! MHD_SUPPORT_THREADS */
 }
 
 
 /**
  * The final part of events initialisation: pre-add ITC and listening FD to
  * the monitored items (if supported by monitoring syscall).
  * @param d the daemon object
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 init_daemon_fds_monitoring (struct MHD_Daemon *restrict d)
 {
   mhd_assert (d->dbg.net_inited);
   mhd_assert (! d->dbg.net_deinited);
   mhd_assert (d->dbg.events_allocated);
   mhd_assert (! d->dbg.events_fully_inited);
   mhd_assert (mhd_D_TYPE_HAS_EVENTS_PROCESSING (d->threading.d_type));
 #ifdef MHD_SUPPORT_THREADS
   mhd_assert (mhd_ITC_IS_VALID (d->threading.itc));
 #endif
 
   d->events.accept_pending = false;
 
   switch (d->events.poll_type)
   {
   case mhd_POLL_TYPE_EXT:
     mhd_assert (NULL != d->events.data.extr.cb_data.cb);
 #ifdef MHD_SUPPORT_THREADS
     d->events.data.extr.itc_data.is_active = false;
     d->events.data.extr.itc_data.is_broken = false;
 #endif /* MHD_SUPPORT_THREADS */
     if (! d->events.data.extr.reg_all)
     {
       bool itc_reg_succeed;
 
       /* Register daemon's FDs now */
 #ifdef MHD_SUPPORT_THREADS
       d->events.data.extr.itc_data.app_cntx =
         mhd_daemon_extr_event_reg (d,
                                    mhd_itc_r_fd (d->threading.itc),
                                    MHD_FD_STATE_RECV_EXCEPT,
                                    NULL,
                                    (struct MHD_EventUpdateContext *)
                                    mhd_SOCKET_REL_MARKER_ITC);
       itc_reg_succeed = (NULL != d->events.data.extr.itc_data.app_cntx);
 #else  /* ! MHD_SUPPORT_THREADS */
       itc_reg_succeed = true;
 #endif /* ! MHD_SUPPORT_THREADS */
       if (itc_reg_succeed)
       {
         if (MHD_INVALID_SOCKET == d->net.listen.fd)
         {
           d->events.data.extr.listen_data.app_cntx = NULL;
           return MHD_SC_OK; /* Success exit point */
         }
 
         /* Need to register the listen FD */
         d->events.data.extr.listen_data.app_cntx =
           mhd_daemon_extr_event_reg (d,
                                      d->net.listen.fd,
                                      MHD_FD_STATE_RECV_EXCEPT,
                                      NULL,
                                      (struct MHD_EventUpdateContext *)
                                      mhd_SOCKET_REL_MARKER_LISTEN);
         if (NULL != d->events.data.extr.listen_data.app_cntx)
           return MHD_SC_OK; /* Success exit point */
 
         /* Below is a clean-up path for 'case mhd_POLL_TYPE_EXT:' */
 #ifdef MHD_SUPPORT_THREADS
         /* De-register ITC FD */
         (void) mhd_daemon_extr_event_reg (d,
                                           mhd_itc_r_fd (d->threading.itc),
                                           MHD_FD_STATE_NONE,
                                           d->events.data.extr.itc_data.app_cntx,
                                           (struct MHD_EventUpdateContext *)
                                           mhd_SOCKET_REL_MARKER_ITC);
         d->events.data.extr.itc_data.app_cntx = NULL;
 #endif /* MHD_SUPPORT_THREADS */
       }
 
       mhd_LOG_MSG (d, MHD_SC_EXT_EVENT_REG_DAEMON_FDS_FAILURE, \
                    "Failed to register daemon FDs in the application "
                    "(external events) monitoring.");
       return MHD_SC_EXT_EVENT_REG_DAEMON_FDS_FAILURE;
     }
     else
     {
       /* Daemons FDs are repeatedly registered every processing cycle */
 #ifdef MHD_SUPPORT_THREADS
       d->events.data.extr.itc_data.app_cntx = NULL;
 #endif /* MHD_SUPPORT_THREADS */
       d->events.data.extr.listen_data.app_cntx = NULL;
       return MHD_SC_OK;
     }
     break;
 #ifdef MHD_SUPPORT_SELECT
   case mhd_POLL_TYPE_SELECT:
     mhd_assert (NULL != d->events.data.select.rfds);
     mhd_assert (NULL != d->events.data.select.wfds);
     mhd_assert (NULL != d->events.data.select.efds);
     /* Nothing to do when using 'select()' */
     return MHD_SC_OK;
     break;
 #endif /* MHD_SUPPORT_SELECT */
 #ifdef MHD_SUPPORT_POLL
   case mhd_POLL_TYPE_POLL:
     mhd_assert (NULL != d->events.data.poll.fds);
     mhd_assert (NULL != d->events.data.poll.rel);
     if (1)
     {
       unsigned int i;
       i = 0;
 #ifdef MHD_SUPPORT_THREADS
       d->events.data.poll.fds[i].fd = mhd_itc_r_fd (d->threading.itc);
       d->events.data.poll.fds[i].events = POLLIN;
       d->events.data.poll.rel[i].fd_id = mhd_SOCKET_REL_MARKER_ITC;
       ++i;
 #endif
       if (MHD_INVALID_SOCKET != d->net.listen.fd)
       {
         d->events.data.poll.fds[i].fd = d->net.listen.fd;
         d->events.data.poll.fds[i].events = POLLIN;
         d->events.data.poll.rel[i].fd_id = mhd_SOCKET_REL_MARKER_LISTEN;
       }
     }
     return MHD_SC_OK;
     break;
 #endif /* MHD_SUPPORT_POLL */
 #ifdef MHD_SUPPORT_EPOLL
   case mhd_POLL_TYPE_EPOLL:
     mhd_assert (MHD_INVALID_SOCKET != d->events.data.epoll.e_fd);
     mhd_assert (MHD_INVALID_SOCKET == d->events.data.epoll.early_fd);
     mhd_assert (NULL != d->events.data.epoll.events);
     mhd_assert (0 < d->events.data.epoll.num_elements);
     if (1)
     {
       struct epoll_event reg_event;
 #ifdef MHD_SUPPORT_THREADS
       reg_event.events = EPOLLIN | EPOLLET;
       reg_event.data.u64 = (uint64_t) mhd_SOCKET_REL_MARKER_ITC; /* uint64_t is used in the epoll header */
       if (0 != epoll_ctl (d->events.data.epoll.e_fd, EPOLL_CTL_ADD,
                           mhd_itc_r_fd (d->threading.itc), &reg_event))
       {
         mhd_LOG_MSG (d, MHD_SC_EVENTS_REG_DAEMON_FDS_FAILURE, \
                      "Failed to add ITC FD to the epoll monitoring.");
         return MHD_SC_EVENTS_REG_DAEMON_FDS_FAILURE;
       }
       mhd_dbg_print_fd_mon_req ("ITC", \
                                 mhd_itc_r_fd (d->threading.itc), \
                                 true, \
                                 false, \
                                 false);
 #endif
       if (MHD_INVALID_SOCKET != d->net.listen.fd)
       {
         reg_event.events = EPOLLIN;
         reg_event.data.u64 = (uint64_t) mhd_SOCKET_REL_MARKER_LISTEN; /* uint64_t is used in the epoll header */
         if (0 != epoll_ctl (d->events.data.epoll.e_fd, EPOLL_CTL_ADD,
                             d->net.listen.fd, &reg_event))
         {
           mhd_LOG_MSG (d, MHD_SC_EVENTS_REG_DAEMON_FDS_FAILURE, \
                        "Failed to add listening FD to the epoll monitoring.");
           return MHD_SC_EVENTS_REG_DAEMON_FDS_FAILURE;
         }
         mhd_dbg_print_fd_mon_req ("lstn", \
                                   d->net.listen.fd, \
                                   true, \
                                   false, \
                                   false);
       }
     }
     return MHD_SC_OK;
     break;
 #endif /* MHD_SUPPORT_EPOLL */
 #ifdef MHD_SUPPORT_KQUEUE
   case mhd_POLL_TYPE_KQUEUE:
     mhd_assert (0 < d->events.data.kq.kq_fd);
     mhd_assert (NULL != d->events.data.kq.kes);
     mhd_assert (2u < d->events.data.kq.num_elements);
     if (1)
     {
       int num_elemnts;
 
       num_elemnts = 0;
 #ifdef MHD_SUPPORT_THREADS
       mhd_KE_SET (d->events.data.kq.kes + num_elemnts,
                   mhd_itc_r_fd (d->threading.itc),
                   EVFILT_READ,
                   EV_ADD, /* level trigger */
                   mhd_SOCKET_REL_PTRMARKER_ITC);
       mhd_dbg_print_kevent_change ("ITC",
                                    d->events.data.kq.kes + num_elemnts);
       ++num_elemnts;
 #endif
       if (MHD_INVALID_SOCKET != d->net.listen.fd)
       {
         mhd_KE_SET (d->events.data.kq.kes + num_elemnts,
                     d->net.listen.fd,
                     EVFILT_READ,
                     EV_ADD, /* level trigger */
                     mhd_SOCKET_REL_PTRMARKER_LISTEN);
 
         mhd_dbg_print_kevent_change ("lstn",
                                      d->events.data.kq.kes + num_elemnts);
         ++num_elemnts;
       }
 
       if (0 != num_elemnts)
       {
         static const struct timespec zero_timeout = {0, 0};
         int res;
 
 #ifdef MHD_USE_TRACE_POLLING_FDS
         fprintf (stderr,
                  "### (Starting) kevent(%d, changes, %d, [NULL], "
                  "0, [0, 0])...\n",
                  d->events.data.kq.kq_fd,
                  num_elemnts);
 #endif /* MHD_USE_TRACE_POLLING_FDS */
         res = kevent (d->events.data.kq.kq_fd,
                       d->events.data.kq.kes,
                       num_elemnts,
                       NULL,
                       0,
                       &zero_timeout);
 #ifdef MHD_USE_TRACE_POLLING_FDS
         fprintf (stderr,
                  "### (Finished) kevent(%d, changes, %d, [NULL], "
                  "0, [0, 0]) -> %d\n",
                  d->events.data.kq.kq_fd,
                  num_elemnts,
                  res);
 #endif /* MHD_USE_TRACE_POLLING_FDS */
         if (0 != res)
         {
           mhd_LOG_MSG (d, MHD_SC_EVENTS_REG_DAEMON_FDS_FAILURE, \
                        "Failed to add ITC or listening FD to the "
                        "kqueue monitoring.");
           return MHD_SC_EVENTS_REG_DAEMON_FDS_FAILURE;
         }
       }
     }
     return MHD_SC_OK;
     break;
 #endif /* MHD_SUPPORT_KQUEUE */
 #ifndef MHD_SUPPORT_SELECT
   case mhd_POLL_TYPE_SELECT:
 #endif /* ! MHD_SUPPORT_SELECT */
 #ifndef MHD_SUPPORT_POLL
   case mhd_POLL_TYPE_POLL:
 #endif /* ! MHD_SUPPORT_POLL */
   case mhd_POLL_TYPE_NOT_SET_YET:
   default:
     mhd_UNREACHABLE ();
     break;
   }
   mhd_UNREACHABLE ();
   return MHD_SC_INTERNAL_ERROR;
 }
 
 
 /**
  * The initial part of events de-initialisation: remove ITC and listening FD
  * from the monitored items (if supported by monitoring syscall).
  * @param d the daemon object
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 deinit_daemon_fds_monitoring (struct MHD_Daemon *restrict d)
 {
   mhd_assert (d->dbg.events_fully_inited);
 
   switch (d->events.poll_type)
   {
   case mhd_POLL_TYPE_EXT:
     if (NULL != d->events.data.extr.listen_data.app_cntx)
       (void) mhd_daemon_extr_event_reg (
         d,
         d->net.listen.fd,
         MHD_FD_STATE_NONE,
         d->events.data.extr.listen_data.app_cntx,
         (struct MHD_EventUpdateContext *) mhd_SOCKET_REL_MARKER_LISTEN);
 #ifdef MHD_SUPPORT_THREADS
     if (NULL != d->events.data.extr.itc_data.app_cntx)
       (void) mhd_daemon_extr_event_reg (d,
                                         mhd_itc_r_fd (d->threading.itc),
                                         MHD_FD_STATE_NONE,
                                         d->events.data.extr.itc_data.app_cntx,
                                         (struct MHD_EventUpdateContext *)
                                         mhd_SOCKET_REL_MARKER_ITC);
 #endif /* MHD_SUPPORT_THREADS */
     return;
 #ifdef MHD_SUPPORT_SELECT
   case mhd_POLL_TYPE_SELECT:
     /* Nothing to do when using 'select()' */
     return;
     break;
 #endif /* MHD_SUPPORT_SELECT */
 #ifdef MHD_SUPPORT_POLL
   case mhd_POLL_TYPE_POLL:
     /* Nothing to do when using 'poll()' */
     return;
     break;
 #endif /* MHD_SUPPORT_POLL */
 #ifdef MHD_SUPPORT_EPOLL
   case mhd_POLL_TYPE_EPOLL:
     /* Nothing to do when using epoll.
        Monitoring stopped by closing epoll FD. */
     return;
     break;
 #endif /* MHD_SUPPORT_EPOLL */
 #ifdef MHD_SUPPORT_KQUEUE
   case mhd_POLL_TYPE_KQUEUE:
     /* Nothing to do when using kqueue.
        Monitoring stopped by closing kqueue FD. */
     return;
     break;
 #endif /* MHD_SUPPORT_EPOLL */
 #ifndef MHD_SUPPORT_SELECT
   case mhd_POLL_TYPE_SELECT:
 #endif /* ! MHD_SUPPORT_SELECT */
 #ifndef MHD_SUPPORT_POLL
   case mhd_POLL_TYPE_POLL:
 #endif /* ! MHD_SUPPORT_POLL */
   case mhd_POLL_TYPE_NOT_SET_YET:
   default:
     mhd_UNREACHABLE ();
     break;
   }
   mhd_UNREACHABLE ();
 }
 
 
 /**
  * Initialise daemon connections' data.
  * @param d the daemon object
  * @param s the user settings
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) MHD_FN_PAR_NONNULL_ (2)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 init_individual_conns (struct MHD_Daemon *restrict d,
                        struct DaemonOptions *restrict s)
 {
   mhd_assert (! mhd_D_TYPE_HAS_WORKERS (d->threading.d_type));
   mhd_assert (0 != d->conns.cfg.count_limit);
 
   mhd_DLINKEDL_INIT_LIST (&(d->conns),all_conn);
   mhd_DLINKEDL_INIT_LIST (&(d->conns),def_timeout);
   mhd_DLINKEDL_INIT_LIST (&(d->conns),cust_timeout);
   d->conns.count = 0;
   d->conns.block_new = false;
 
   d->conns.cfg.mem_pool_size = s->conn_memory_limit;
   if (0 == d->conns.cfg.mem_pool_size)
     d->conns.cfg.mem_pool_size = 32 * 1024;
   else if (256 > d->conns.cfg.mem_pool_size)
     d->conns.cfg.mem_pool_size = 256;
 
   switch (s->conn_buff_zeroing)
   {
   case MHD_CONN_BUFFER_ZEROING_DISABLED:
     d->conns.cfg.mem_pool_zeroing = MHD_MEMPOOL_ZEROING_NEVER;
     break;
   case MHD_CONN_BUFFER_ZEROING_BASIC:
     d->conns.cfg.mem_pool_zeroing = MHD_MEMPOOL_ZEROING_ON_RESET;
     break;
   case MHD_CONN_BUFFER_ZEROING_HEAVY:
   default:
     d->conns.cfg.mem_pool_zeroing = MHD_MEMPOOL_ZEROING_ALWAYS;
     break;
   }
 
 #ifdef MHD_SUPPORT_UPGRADE
   mhd_DLINKEDL_INIT_LIST (&(d->conns.upgr),upgr_cleanup);
   if (! mhd_mutex_init (&(d->conns.upgr.ucu_lock)))
   {
     mhd_LOG_MSG (d, MHD_SC_MUTEX_INIT_FAILURE, \
                  "Failed to initialise mutex for the upgraded " \
                  "connection list.");
     return MHD_SC_MUTEX_INIT_FAILURE;
   }
 #endif /* MHD_SUPPORT_UPGRADE */
 
 #ifndef NDEBUG
   d->dbg.connections_inited = true;
 #endif
   return MHD_SC_OK;
 }
 
 
 /**
  * Deinitialise daemon connections' data.
  * @param d the daemon object
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 deinit_individual_conns (struct MHD_Daemon *restrict d)
 {
 #ifdef MHD_SUPPORT_UPGRADE
   mhd_assert (NULL == mhd_DLINKEDL_GET_FIRST (&(d->conns.upgr),upgr_cleanup));
   mhd_assert (NULL == mhd_DLINKEDL_GET_LAST (&(d->conns.upgr),upgr_cleanup));
 
   mhd_mutex_destroy_chk (&(d->conns.upgr.ucu_lock));
 #endif /* MHD_SUPPORT_UPGRADE */
 
   mhd_assert (0 != d->conns.cfg.mem_pool_size);
   mhd_assert (0 == d->conns.count);
   mhd_assert (NULL == mhd_DLINKEDL_GET_FIRST (&(d->conns),cust_timeout));
   mhd_assert (NULL == mhd_DLINKEDL_GET_LAST (&(d->conns),cust_timeout));
   mhd_assert (NULL == mhd_DLINKEDL_GET_FIRST (&(d->conns),def_timeout));
   mhd_assert (NULL == mhd_DLINKEDL_GET_LAST (&(d->conns),def_timeout));
   mhd_assert (NULL == mhd_DLINKEDL_GET_FIRST (&(d->conns),all_conn));
   mhd_assert (NULL == mhd_DLINKEDL_GET_LAST (&(d->conns),all_conn));
 }
 
 
 /**
  * Prepare daemon-local (worker daemon for thread pool mode) threading data
  * and finish events initialising.
  * To be used only with non-master daemons.
  * Do not start the thread even if configured for the internal threads.
  * @param d the daemon object
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) MHD_FN_PAR_NONNULL_ (2)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 init_individual_thread_data_events_conns (struct MHD_Daemon *restrict d,
                                           struct DaemonOptions *restrict s)
 {
   enum MHD_StatusCode res;
   mhd_assert (mhd_D_TYPE_IS_VALID (d->threading.d_type));
   mhd_assert (mhd_D_TYPE_HAS_EVENTS_PROCESSING (d->threading.d_type));
   mhd_assert (! mhd_D_TYPE_HAS_WORKERS (d->threading.d_type));
   mhd_assert (! d->dbg.connections_inited);
 
   res = init_events_fd (d);
   if (MHD_SC_OK != res)
     return res;
 
   res = allocate_events (d);
   if (MHD_SC_OK == res)
   {
     res = init_itc (d);
     if (MHD_SC_OK == res)
     {
       res = init_daemon_fds_monitoring (d);
 
       if (MHD_SC_OK == res)
       {
 #ifndef NDEBUG
         d->dbg.events_fully_inited = true;
 #endif
 #ifdef MHD_SUPPORT_THREADS
         mhd_thread_handle_ID_set_invalid (&(d->threading.tid));
         d->threading.stop_requested = false;
 #endif /* MHD_SUPPORT_THREADS */
 #ifndef NDEBUG
         d->dbg.threading_inited = true;
 #endif
 
         res = init_individual_conns (d, s);
         if (MHD_SC_OK == res)
           return MHD_SC_OK;
 
         /* Below is a clean-up path */
 
         deinit_daemon_fds_monitoring (d);
       }
       deinit_itc (d);
     }
     deallocate_events (d);
   }
   deinit_events_fd (d);
 
   mhd_assert (MHD_SC_OK != res);
   return res;
 }
 
 
 /**
  * Deinit daemon-local (worker daemon for thread pool mode) threading data
  * and deallocate events.
  * To be used only with non-master daemons.
  * The internal thread (is any) must be stopped already.
  * @param d the daemon object
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 deinit_individual_thread_data_events_conns (struct MHD_Daemon *restrict d)
 {
   deinit_individual_conns (d);
   deinit_daemon_fds_monitoring (d);
   deinit_itc (d);
   deallocate_events (d);
   deinit_events_fd (d);
   mhd_assert (NULL == mhd_DLINKEDL_GET_FIRST (&(d->conns),all_conn));
   mhd_assert (NULL == mhd_DLINKEDL_GET_FIRST (&(d->events),proc_ready));
 #ifndef NDEBUG
   d->dbg.events_fully_inited = false;
 #endif
 }
 
 
 /**
  * Initialise the data specific only for the worker daemon.
  * @param d the daemon object
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 init_worker_only_data (struct MHD_Daemon *restrict d)
 {
   enum MHD_StatusCode res;
   struct mhd_DaemonExtAddedConnectionsWorker *worker_only_data =
     &(d->events.act_req.ext_added.worker);
 
   mhd_assert (! mhd_D_HAS_WORKERS (d));
   mhd_assert (d->dbg.net_inited);
   mhd_assert (! d->dbg.worker_only_inited);
   mhd_assert (mhd_D_HAS_MASTER (d) || ! d->dbg.master_only_inited);
   mhd_assert (! mhd_D_HAS_MASTER (d) || d->dbg.master_only_inited);  /* Copied from master daemon */
 
 #ifndef NDEBUG
   /* "master"-only data will be overwritten here without de-initialising */
   d->dbg.master_only_inited = false;
 #endif /* ! NDEBUG */
 
   mhd_DLINKEDL_INIT_LIST (worker_only_data, queue);
 
   if (! mhd_mutex_init (&(worker_only_data->q_lock)))
   {
     mhd_LOG_MSG (d, MHD_SC_MUTEX_INIT_FAILURE, \
                  "Failed to initialise mutex for externally added "
                  "connections");
     res = MHD_SC_MUTEX_INIT_FAILURE;
   }
   else
     res = MHD_SC_OK;
 
 #ifndef NDEBUG
   if (MHD_SC_OK == res)
     d->dbg.worker_only_inited = true;
 #endif /* ! NDEBUG */
 
   return res;
 }
 
 
 /**
  * De-initialise the data specific only for the worker daemon.
  * @param d the daemon object
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 deinit_worker_only_data (struct MHD_Daemon *restrict d)
 {
   struct mhd_DaemonExtAddedConnectionsWorker *worker_only_data =
     &(d->events.act_req.ext_added.worker);
   struct mhd_DaemonExtAddedConn *q_e;
 
   mhd_assert (! mhd_D_HAS_WORKERS (d));
   mhd_assert (d->dbg.net_inited);
   mhd_assert (d->dbg.worker_only_inited);
   mhd_assert (! d->dbg.master_only_inited);
 
   /* Clean-up all unprocessed entries */
 
   for (q_e = mhd_DLINKEDL_GET_FIRST (worker_only_data, queue);
        NULL != q_e;
        q_e = mhd_DLINKEDL_GET_FIRST (worker_only_data, queue))
   {
     mhd_ASSUME (NULL == mhd_DLINKEDL_GET_PREV (q_e, queue));
     mhd_DLINKEDL_DEL (worker_only_data, q_e, queue);
     mhd_socket_close (q_e->skt);
 
     if (NULL != q_e->addr)
       free (q_e->addr);
 
     free (q_e);
   }
 
   mhd_mutex_destroy_chk (&(worker_only_data->q_lock));
 
 #ifndef NDEBUG
   d->dbg.worker_only_inited = false;
 #endif /* ! NDEBUG */
 }
 
 
 /**
  * Initialise worker daemon (the only daemon or member of the worker pool)
  * worker-specific daemon data, individual thread data and finish events
  * initialising.
  * To be used only with non-master daemons.
  * Do not start the thread even if configured for the internal threads.
  * @param d the daemon object
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) MHD_FN_PAR_NONNULL_ (2)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 init_worker (struct MHD_Daemon *restrict d,
              struct DaemonOptions *restrict s)
 {
   enum MHD_StatusCode res;
   mhd_assert (! mhd_D_TYPE_HAS_WORKERS (d->threading.d_type));
 
   res = init_worker_only_data (d);
 
   if (MHD_SC_OK == res)
   {
     res = init_individual_thread_data_events_conns (d,
                                                     s);
 
     if (MHD_SC_OK == res)
       return MHD_SC_OK;
 
     /* Below is a clean-up path */
 
     deinit_worker_only_data (d);
   }
 
   mhd_assert (MHD_SC_OK != res);
 
   return res;
 }
 
 
 /**
  * De-initialise worker daemon (the only daemon or member of the worker pool)
  * worker-specific daemon data, individual thread data and finish events
  * initialising.
  * To be used only with non-master daemons.
  * The internal thread (is any) must be stopped already.
  * @param d the daemon object
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 deinit_worker (struct MHD_Daemon *restrict d)
 {
   mhd_assert (! mhd_D_TYPE_HAS_WORKERS (d->threading.d_type));
 
   deinit_individual_thread_data_events_conns (d);
 
   deinit_worker_only_data (d);
 }
 
 
 /**
  * Set the maximum number of handled connections for the daemon.
  * Works only for global limit, does not work for the worker daemon.
  * @param d the daemon object
  * @param s the user settings
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) MHD_FN_PAR_NONNULL_ (2)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 set_connections_total_limits (struct MHD_Daemon *restrict d,
                               struct DaemonOptions *restrict s)
 {
   unsigned int limit_by_conf;
   unsigned int limit_by_num;
   unsigned int limit_by_select;
   unsigned int resulting_limit;
   bool error_by_fd_setsize;
   unsigned int num_worker_daemons;
 
   mhd_assert (! mhd_D_HAS_MASTER (d));
   mhd_assert (mhd_D_TYPE_IS_VALID (d->threading.d_type));
 
   num_worker_daemons = 1;
 #ifdef MHD_SUPPORT_THREADS
   if (mhd_WM_INT_INTERNAL_EVENTS_THREAD_POOL == d->wmode_int)
   {
     mhd_assert (MHD_WM_WORKER_THREADS == s->work_mode.mode);
     if ((0 != s->global_connection_limit) &&
         (0 != s->work_mode.params.num_worker_threads) &&
         (s->global_connection_limit < s->work_mode.params.num_worker_threads))
     {
       mhd_LOG_MSG ( \
         d, MHD_SC_CONFIGURATION_CONN_LIMIT_TOO_SMALL, \
         "The limit specified by MHD_D_O_GLOBAL_CONNECTION_LIMIT is smaller " \
         "then the number of worker threads.");
       return MHD_SC_CONFIGURATION_CONN_LIMIT_TOO_SMALL;
     }
   }
   if (mhd_D_TYPE_HAS_WORKERS (d->threading.d_type))
     num_worker_daemons = s->work_mode.params.num_worker_threads;
 #endif /* MHD_SUPPORT_THREADS */
 
   limit_by_conf = s->global_connection_limit;
   limit_by_num = UINT_MAX;
   limit_by_select = UINT_MAX;
   mhd_assert (UINT_MAX == limit_by_num); /* Mute analyser warning */
 
   error_by_fd_setsize = false;
 #ifdef MHD_SOCKETS_KIND_POSIX
   if (1)
   {
     limit_by_num = (unsigned int) d->net.cfg.max_fd_num;
     if (0 != limit_by_num)
     {
       /* Find the upper limit.
          The real limit is lower, as any other process FDs will use the slots
          in the allowed numbers range */
       limit_by_num -= 3; /* The numbers zero, one and two are used typically */
 #ifdef MHD_SUPPORT_THREADS
       limit_by_num -= mhd_ITC_NUM_FDS * num_worker_daemons;
 #endif /* MHD_SUPPORT_THREADS */
       if (MHD_INVALID_SOCKET != d->net.listen.fd)
         --limit_by_num; /* One FD is used for the listening socket */
       if ((num_worker_daemons > limit_by_num) ||
           (limit_by_num > (unsigned int) d->net.cfg.max_fd_num) /* Underflow */)
       {
         if (d->net.cfg.max_fd_num == s->fd_number_limit)
         {
           mhd_LOG_MSG ( \
             d, MHD_SC_MAX_FD_NUMBER_LIMIT_TOO_STRICT, \
             "The limit specified by MHD_D_O_FD_NUMBER_LIMIT is too strict " \
             "for this daemon settings.");
           return MHD_SC_MAX_FD_NUMBER_LIMIT_TOO_STRICT;
         }
         else
         {
           mhd_assert (mhd_POLL_TYPE_SELECT == d->events.poll_type);
           error_by_fd_setsize = true;
         }
       }
     }
     else
       limit_by_num = (unsigned int) INT_MAX;
   }
 #elif defined(MHD_SOCKETS_KIND_WINSOCK)
   if (1)
   {
 #ifdef MHD_SUPPORT_SELECT
     if ((mhd_DAEMON_TYPE_SINGLE == d->threading.d_type) &&
         (mhd_POLL_TYPE_SELECT == d->events.poll_type))
     {
       /* W32 limits the total number (count) of sockets used for select() */
       unsigned int limit_per_worker;
 
       limit_per_worker = FD_SETSIZE;
       if (MHD_INVALID_SOCKET != d->net.listen.fd)
         --limit_per_worker;  /* The slot for the listening socket */
 #ifdef MHD_SUPPORT_THREADS
       --limit_per_worker;  /* The slot for the ITC */
 #endif /* MHD_SUPPORT_THREADS */
       if ((0 == limit_per_worker) || (limit_per_worker > FD_SETSIZE))
         error_by_fd_setsize = true;
       else
       {
         limit_by_select = limit_per_worker * num_worker_daemons;
         if (limit_by_select / limit_per_worker != num_worker_daemons)
           limit_by_select = UINT_MAX;
       }
     }
 #endif /* MHD_SUPPORT_SELECT */
     (void) 0; /* Mute compiler warning */
   }
 #endif /* MHD_SOCKETS_KIND_POSIX */
   if (error_by_fd_setsize)
   {
     mhd_LOG_MSG ( \
       d, MHD_SC_SYS_FD_SETSIZE_TOO_STRICT, \
       "The FD_SETSIZE is too strict to run daemon with the polling " \
       "by select() and with the specified number of workers.");
     return MHD_SC_SYS_FD_SETSIZE_TOO_STRICT;
   }
 
   if (0 != limit_by_conf)
   {
     /* The number has bet set explicitly */
     resulting_limit = limit_by_conf;
   }
   else
   {
     /* No user configuration provided */
     unsigned int suggested_limit;
 #ifndef MHD_SOCKETS_KIND_WINSOCK
 #define TYPICAL_NOFILES_LIMIT (1024)  /* The usual limit for the number of open FDs */
     suggested_limit = TYPICAL_NOFILES_LIMIT;
     suggested_limit -= 3; /* The numbers zero, one and two are used typically */
 #ifdef MHD_SUPPORT_THREADS
     suggested_limit -= mhd_ITC_NUM_FDS * num_worker_daemons;
 #endif /* MHD_SUPPORT_THREADS */
     if (MHD_INVALID_SOCKET != d->net.listen.fd)
       --suggested_limit; /* One FD is used for the listening socket */
     if (suggested_limit > TYPICAL_NOFILES_LIMIT)
       suggested_limit = 0; /* Overflow */
 #else  /* MHD_SOCKETS_KIND_WINSOCK */
 #ifdef _WIN64
     suggested_limit = 2048;
 #else
     suggested_limit = 1024;
 #endif
 #endif /* MHD_SOCKETS_KIND_WINSOCK */
     if (suggested_limit < num_worker_daemons)
     {
       /* Use at least one connection for every worker daemon and
          let the system to restrict the new connections if they are above
          the system limits. */
       suggested_limit = num_worker_daemons;
     }
     resulting_limit = suggested_limit;
   }
   if (resulting_limit > limit_by_num)
     resulting_limit = limit_by_num;
 
   if (resulting_limit > limit_by_select)
     resulting_limit = limit_by_select;
 
   mhd_assert (resulting_limit >= num_worker_daemons);
   d->conns.cfg.count_limit = resulting_limit;
   if (d->conns.cfg.per_ip_limit <= d->conns.cfg.count_limit)
     d->conns.cfg.per_ip_limit = 0; /* Already enforced by global limit */
 
   return MHD_SC_OK;
 }
 
 
 /**
  * Set correct daemon threading type.
  * Set the number of workers for thread pool type.
  * @param d the daemon object
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 MHD_FN_PAR_NONNULL_ (1) \
   MHD_FN_MUST_CHECK_RESULT_ static inline enum MHD_StatusCode
 set_d_threading_type (struct MHD_Daemon *restrict d)
 {
   switch (d->wmode_int)
   {
   case mhd_WM_INT_EXTERNAL_EVENTS_EDGE:
   case mhd_WM_INT_EXTERNAL_EVENTS_LEVEL:
     mhd_assert (! mhd_WM_INT_HAS_THREADS (d->wmode_int));
     mhd_assert (mhd_POLL_TYPE_EXT == d->events.poll_type);
     mhd_assert (NULL != d->events.data.extr.cb_data.cb);
 #ifdef MHD_SUPPORT_THREADS
     d->threading.d_type = mhd_DAEMON_TYPE_SINGLE;
 #endif /* MHD_SUPPORT_THREADS */
     return MHD_SC_OK;
   case mhd_WM_INT_INTERNAL_EVENTS_NO_THREADS:
     mhd_assert (! mhd_WM_INT_HAS_THREADS (d->wmode_int));
     mhd_assert (mhd_POLL_TYPE_EXT != d->events.poll_type);
 #ifdef MHD_SUPPORT_THREADS
     d->threading.d_type = mhd_DAEMON_TYPE_SINGLE;
 #endif /* MHD_SUPPORT_THREADS */
     return MHD_SC_OK;
 #ifdef MHD_SUPPORT_THREADS
   case mhd_WM_INT_INTERNAL_EVENTS_ONE_THREAD:
     mhd_assert (mhd_WM_INT_HAS_THREADS (d->wmode_int));
     mhd_assert (mhd_POLL_TYPE_EXT != d->events.poll_type);
     d->threading.d_type = mhd_DAEMON_TYPE_SINGLE;
     return MHD_SC_OK;
   case mhd_WM_INT_INTERNAL_EVENTS_THREAD_PER_CONNECTION:
     mhd_assert (mhd_WM_INT_HAS_THREADS (d->wmode_int));
     mhd_assert (mhd_POLL_TYPE_EXT != d->events.poll_type);
     mhd_assert (! mhd_POLL_TYPE_INT_IS_EPOLL (d->events.poll_type));
     mhd_assert (! mhd_POLL_TYPE_INT_IS_KQUEUE (d->events.poll_type));
     d->threading.d_type = mhd_DAEMON_TYPE_LISTEN_ONLY;
     return MHD_SC_OK;
   case mhd_WM_INT_INTERNAL_EVENTS_THREAD_POOL:
     mhd_assert (mhd_WM_INT_HAS_THREADS (d->wmode_int));
     mhd_assert (mhd_POLL_TYPE_EXT != d->events.poll_type);
     d->threading.d_type = mhd_DAEMON_TYPE_MASTER_CONTROL_ONLY;
     return MHD_SC_OK;
 #endif /* MHD_SUPPORT_THREADS */
   default:
     break;
   }
   mhd_UNREACHABLE ();
   return MHD_SC_INTERNAL_ERROR;
 }
 
 
 #ifdef MHD_SUPPORT_THREADS
 
 /**
  * De-initialise workers pool, including workers daemons.
  * The threads must be not running.
  * @param d the daemon object
  * @param num_workers the number of workers to deinit
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 deinit_workers_pool (struct MHD_Daemon *restrict d,
                      unsigned int num_workers)
 {
   unsigned int i;
   mhd_assert (mhd_D_TYPE_HAS_WORKERS (d->threading.d_type));
   mhd_assert (NULL != d->threading.hier.pool.workers);
   mhd_assert ((2 <= d->threading.hier.pool.num) || \
               (mhd_DAEMON_STATE_STARTING == d->state));
   mhd_assert ((num_workers == d->threading.hier.pool.num) || \
               (mhd_DAEMON_STATE_STARTING == d->state));
   mhd_assert ((mhd_DAEMON_STATE_STOPPING == d->state) || \
               (mhd_DAEMON_STATE_STARTING == d->state));
 
   /* Deinitialise in reverse order */
   for (i = num_workers - 1; num_workers > i; --i)
   { /* Note: loop exits after underflow of 'i' */
     struct MHD_Daemon *const worker = d->threading.hier.pool.workers + i;
     deinit_worker (worker);
   }
   free (d->threading.hier.pool.workers);
 #ifndef NDEBUG
   d->dbg.thread_pool_inited = false;
 #endif
 }
 
 
 /**
  * Nullify worker daemon member that copied from master daemon but must not
  * be used in worker
  * @param d the daemon object
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 reset_master_only_areas (struct MHD_Daemon *restrict d)
 {
 #ifdef MHD_SUPPORT_EPOLL
   /* In release builds this is done mostly for safety as @a early_fd is used
      in workers only for asserts */
   if (mhd_POLL_TYPE_EPOLL == d->events.poll_type)
     d->events.data.epoll.early_fd = MHD_INVALID_SOCKET;
 #endif /* MHD_SUPPORT_EPOLL */
 
 #ifdef MHD_SUPPORT_AUTH_DIGEST
   memset (&(d->auth_dg.nonces_lock),
           0x7F,
           sizeof(d->auth_dg.nonces_lock));
 #endif
   /* Not needed. It is initialised later */
   /* memset (&(d->req_cfg.large_buf), 0, sizeof(d->req_cfg.large_buf)); */
   (void) d;
 }
 
 
 /**
  * Initialise workers pool, including workers daemons.
  * Do not start the threads.
  * @param d the daemon object
  * @param s the user settings
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) MHD_FN_PAR_NONNULL_ (2)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 init_workers_pool (struct MHD_Daemon *restrict d,
                    struct DaemonOptions *restrict s)
 {
   enum MHD_StatusCode res;
   size_t workers_pool_size;
   unsigned int conn_per_daemon;
   unsigned int num_workers;
   unsigned int conn_remainder;
   unsigned int i;
 
   mhd_assert (d->dbg.net_inited);
   mhd_assert (! d->dbg.net_deinited);
   mhd_assert (mhd_WM_INT_INTERNAL_EVENTS_THREAD_POOL == d->wmode_int);
   mhd_assert (mhd_D_TYPE_HAS_WORKERS (d->threading.d_type));
   mhd_assert (mhd_POLL_TYPE_NOT_SET_YET < d->events.poll_type);
   mhd_assert (1 < s->work_mode.params.num_worker_threads);
   mhd_assert (0 != d->conns.cfg.count_limit);
   mhd_assert (s->work_mode.params.num_worker_threads <= \
               d->conns.cfg.count_limit);
   mhd_assert (! d->dbg.thread_pool_inited);
 
   num_workers = s->work_mode.params.num_worker_threads;
   workers_pool_size =
     (sizeof(struct MHD_Daemon) * num_workers);
   if (workers_pool_size / num_workers != sizeof(struct MHD_Daemon))
   { /* Overflow */
     mhd_LOG_MSG ( \
       d, MHD_SC_THREAD_POOL_MEM_ALLOC_FAILURE, \
       "The size of the thread pool is too large.");
     return MHD_SC_THREAD_POOL_MEM_ALLOC_FAILURE;
   }
 
 #ifndef NDEBUG
   mhd_itc_set_invalid (&(d->threading.itc));
   mhd_thread_handle_ID_set_invalid (&(d->threading.tid));
 #endif
 
   d->threading.hier.pool.workers = (struct MHD_Daemon *)
                                    malloc (workers_pool_size);
   if (NULL == d->threading.hier.pool.workers)
   {
     mhd_LOG_MSG ( \
       d, MHD_SC_THREAD_POOL_MEM_ALLOC_FAILURE, \
       "Failed to allocate memory for the thread pool.");
     return MHD_SC_THREAD_POOL_MEM_ALLOC_FAILURE;
   }
 
   conn_per_daemon = d->conns.cfg.count_limit / num_workers;
   conn_remainder = d->conns.cfg.count_limit % num_workers;
   res = MHD_SC_OK;
   for (i = 0; num_workers > i; ++i)
   {
     struct MHD_Daemon *restrict const worker =
       d->threading.hier.pool.workers + i;
     memcpy (worker, d, sizeof(struct MHD_Daemon));
     reset_master_only_areas (worker);
 
     worker->threading.d_type = mhd_DAEMON_TYPE_WORKER;
     worker->threading.hier.master = d;
     worker->conns.cfg.count_limit = conn_per_daemon;
     if (conn_remainder > i)
       worker->conns.cfg.count_limit++; /* Distribute the reminder */
 #ifdef MHD_SUPPORT_EPOLL
     mhd_assert ((mhd_POLL_TYPE_EPOLL != worker->events.poll_type) ||
                 (0 != i) ||
                 (0 < d->events.data.epoll.early_fd));
     mhd_assert ((mhd_POLL_TYPE_EPOLL != worker->events.poll_type) ||
                 (0 == i) ||
                 (MHD_INVALID_SOCKET == d->events.data.epoll.early_fd));
 #endif /* MHD_SUPPORT_EPOLL */
     res = init_worker (worker,
                        s);
     if (MHD_SC_OK != res)
       break;
   }
   if (num_workers == i)
   {
     mhd_assert (MHD_SC_OK == res);
 #ifndef NDEBUG
     d->dbg.thread_pool_inited = true;
     d->dbg.threading_inited = true;
 #endif
     d->threading.hier.pool.num = num_workers;
     return MHD_SC_OK;
   }
 
   /* Below is a clean-up */
 
   mhd_assert (MHD_SC_OK != res);
   deinit_workers_pool (d, i);
   return res;
 }
 
 
 /**
  * Initialise data specific only for the master daemon.
  * @param d the daemon object
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 init_master_only_data (struct MHD_Daemon *restrict d)
 {
   enum MHD_StatusCode res;
 
   mhd_assert (mhd_D_HAS_WORKERS (d));
   mhd_assert (d->dbg.net_inited);
   mhd_assert (! d->dbg.master_only_inited);
   mhd_assert (! d->dbg.worker_only_inited);
 
   if (! mhd_atomic_counter_init ( \
         &(d->events.act_req.ext_added.master.next_d_idx),
         0))
   {
     mhd_LOG_MSG (d, MHD_SC_MUTEX_INIT_FAILURE, \
                  "Failed to initialise atomic counter for externally added "
                  "connections");
     res = MHD_SC_MUTEX_INIT_FAILURE;
   }
   else
     res = MHD_SC_OK;
 
 #ifndef NDEBUG
   if (MHD_SC_OK == res)
     d->dbg.master_only_inited = true;
 #endif /* ! NDEBUG */
 
   return res;
 }
 
 
 /**
  * De-initialise data specific only for the master daemon.
  * @param d the daemon object
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 deinit_master_only_data (struct MHD_Daemon *restrict d)
 {
   mhd_assert (mhd_D_HAS_WORKERS (d));
   mhd_assert (d->dbg.master_only_inited);
   mhd_assert (! d->dbg.worker_only_inited);
 
   mhd_atomic_counter_deinit (&(d->events.act_req.ext_added.master.next_d_idx));
 
 #ifndef NDEBUG
   d->dbg.master_only_inited = false;
 #endif /* ! NDEBUG */
 }
 
 
 /**
  * Initialise individual events, connection data for the "master" daemon,
  * including master-only data, the workers pool, and the workers daemons,
  * including individual worker-specific threading and other data.
  * Do not start the threads.
  * @param d the daemon object
  * @param s the user settings
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) MHD_FN_PAR_NONNULL_ (2)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 init_master (struct MHD_Daemon *restrict d,
              struct DaemonOptions *restrict s)
 {
   enum MHD_StatusCode res;
   mhd_assert (mhd_D_TYPE_HAS_WORKERS (d->threading.d_type));
 
   res = init_master_only_data (d);
   if (MHD_SC_OK != res)
     return res;
 
   res = init_workers_pool (d,
                            s);
   if (MHD_SC_OK == res)
   {
     /* Copy some settings to the master daemon */
     d->conns.cfg.mem_pool_size =
       d->threading.hier.pool.workers[0].conns.cfg.mem_pool_size;
 
     return res;
   }
 
   /* Below is a clean-up path */
 
   deinit_master_only_data (d);
 
   mhd_assert (MHD_SC_OK != res);
   return res;
 }
 
 
 /**
  * De-initialise individual events, connection data for the "master" daemon,
  * including master-only data, the workers pool, and the workers daemons,
  * including individual worker-specific threading and other data.
  * The threads must be not running.
  * @param d the daemon object
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 deinit_master (struct MHD_Daemon *restrict d)
 {
   deinit_workers_pool (d,
                        d->threading.hier.pool.num);
 
   deinit_master_only_data (d);
 }
 
 
 #endif /* MHD_SUPPORT_THREADS */
 
 /**
  * Initialise threading and inter-thread communications.
  * Also finish initialisation of events processing and initialise daemon's
  * connection data.
  * Do not start the thread even if configured for the internal threads.
  * @param d the daemon object
  * @param s the user settings
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) MHD_FN_PAR_NONNULL_ (2)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 daemon_init_threading_and_conn (struct MHD_Daemon *restrict d,
                                 struct DaemonOptions *restrict s)
 {
   enum MHD_StatusCode res;
 
   mhd_assert (d->dbg.net_inited);
   mhd_assert (! d->dbg.net_deinited);
   mhd_assert (mhd_POLL_TYPE_NOT_SET_YET != d->events.poll_type);
 
   res = set_d_threading_type (d);
   if (MHD_SC_OK != res)
     return res;
 
   res = set_connections_total_limits (d, s);
   if (MHD_SC_OK != res)
     return res;
 
 #ifdef MHD_SUPPORT_THREADS
   d->threading.cfg.stack_size = s->stack_size;
 #endif /* MHD_SUPPORT_THREADS */
 
   if (! mhd_D_HAS_WORKERS (d))
     res = init_worker (d,
                        s);
 #ifdef MHD_SUPPORT_THREADS
   else
     res = init_master (d,
                        s);
 #endif /* MHD_SUPPORT_THREADS */
 
   if (MHD_SC_OK == res)
   {
     mhd_assert (d->dbg.events_allocated || \
                 mhd_D_TYPE_HAS_WORKERS (d->threading.d_type));
     mhd_assert (! mhd_D_TYPE_HAS_WORKERS (d->threading.d_type) || \
                 ! d->dbg.events_allocated);
     mhd_assert (! d->dbg.thread_pool_inited || \
                 mhd_D_TYPE_HAS_WORKERS (d->threading.d_type));
     mhd_assert (! mhd_D_TYPE_HAS_WORKERS (d->threading.d_type) || \
                 d->dbg.thread_pool_inited);
     mhd_assert (! mhd_D_TYPE_IS_INTERNAL_ONLY (d->threading.d_type));
     mhd_assert (! d->dbg.events_allocated || d->dbg.connections_inited);
     mhd_assert (! d->dbg.connections_inited || d->dbg.events_allocated);
   }
   return res;
 }
 
 
 /**
  * De-initialise threading and inter-thread communications.
  * Also deallocate events and de-initialise daemon's connection data.
  * No daemon-manged threads should be running.
  * @param d the daemon object
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 daemon_deinit_threading_and_conn (struct MHD_Daemon *restrict d)
 {
   mhd_assert (d->dbg.net_inited);
   mhd_assert (! d->dbg.net_deinited);
   mhd_assert (d->dbg.threading_inited);
   mhd_assert (! mhd_D_TYPE_IS_INTERNAL_ONLY (d->threading.d_type));
   if (! mhd_D_TYPE_HAS_WORKERS (d->threading.d_type))
   {
     mhd_assert (! mhd_WM_INT_IS_THREAD_POOL (d->wmode_int));
     mhd_assert (d->dbg.connections_inited);
     mhd_assert (d->dbg.events_allocated);
     mhd_assert (! d->dbg.thread_pool_inited);
     deinit_worker (d);
   }
   else
   {
 #ifdef MHD_SUPPORT_THREADS
     mhd_assert (mhd_WM_INT_INTERNAL_EVENTS_THREAD_POOL == d->wmode_int);
     mhd_assert (! d->dbg.connections_inited);
     mhd_assert (! d->dbg.events_allocated);
     mhd_assert (d->dbg.thread_pool_inited);
     deinit_master (d);
 #else  /* ! MHD_SUPPORT_THREADS */
     mhd_assert (0 && "Impossible value");
     mhd_UNREACHABLE ();
     (void) 0;
 #endif /* ! MHD_SUPPORT_THREADS */
   }
 }
 
 
 #ifdef MHD_SUPPORT_THREADS
 
 /**
  * Start the daemon individual single thread.
  * Works both for single thread daemons and for worker daemon for thread
  * pool mode.
  * Must be called only for daemons with internal threads.
  * @param d the daemon object, must be completely initialised
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 start_individual_daemon_thread (struct MHD_Daemon *restrict d)
 {
   mhd_assert (d->dbg.threading_inited);
   mhd_assert (mhd_WM_INT_HAS_THREADS (d->wmode_int));
   mhd_assert (mhd_D_TYPE_IS_VALID (d->threading.d_type));
   mhd_assert (! mhd_D_TYPE_HAS_WORKERS (d->threading.d_type));
   mhd_assert (! mhd_thread_handle_ID_is_valid_handle (d->threading.tid));
 
   if (mhd_DAEMON_TYPE_SINGLE == d->threading.d_type)
   {
     if (! mhd_create_named_thread ( \
           &(d->threading.tid), "MHD-single", \
           d->threading.cfg.stack_size, \
           &mhd_worker_all_events, \
           (void*) d))
     {
       mhd_LOG_MSG (d, MHD_SC_THREAD_MAIN_LAUNCH_FAILURE, \
                    "Failed to start daemon main thread.");
       return MHD_SC_THREAD_MAIN_LAUNCH_FAILURE;
     }
   }
   else if (mhd_DAEMON_TYPE_WORKER == d->threading.d_type)
   {
     if (! mhd_create_named_thread ( \
           &(d->threading.tid), "MHD-worker", \
           d->threading.cfg.stack_size, \
           &mhd_worker_all_events, \
           (void*) d))
     {
       mhd_LOG_MSG (d, MHD_SC_THREAD_WORKER_LAUNCH_FAILURE, \
                    "Failed to start daemon worker thread.");
       return MHD_SC_THREAD_WORKER_LAUNCH_FAILURE;
     }
   }
   else if (mhd_DAEMON_TYPE_LISTEN_ONLY == d->threading.d_type)
   {
     if (! mhd_create_named_thread ( \
           &(d->threading.tid), "MHD-listen", \
           d->threading.cfg.stack_size, \
           &mhd_worker_listening_only, \
           (void*) d))
     {
       mhd_LOG_MSG (d, MHD_SC_THREAD_LISTENING_LAUNCH_FAILURE, \
                    "Failed to start daemon listening thread.");
       return MHD_SC_THREAD_LISTENING_LAUNCH_FAILURE;
     }
   }
   else
   {
     mhd_assert (0 && "Impossible value");
     mhd_UNREACHABLE ();
     return MHD_SC_INTERNAL_ERROR;
   }
   mhd_assert (mhd_thread_handle_ID_is_valid_handle (d->threading.tid));
   return MHD_SC_OK;
 }
 
 
 /**
  * Stop the daemon individual single thread.
  * Works both for single thread daemons and for worker daemon for thread
  * pool mode.
  * Must be called only for daemons with internal threads.
  * @param d the daemon object, must be completely initialised
  */
 MHD_FN_PAR_NONNULL_ (1) static void
 stop_individual_daemon_thread (struct MHD_Daemon *restrict d)
 {
   mhd_assert (d->dbg.threading_inited);
   mhd_assert (mhd_WM_INT_HAS_THREADS (d->wmode_int));
   mhd_assert (mhd_D_TYPE_IS_VALID (d->threading.d_type));
   mhd_assert (! mhd_D_TYPE_HAS_WORKERS (d->threading.d_type));
   mhd_assert ((mhd_DAEMON_STATE_STOPPING == d->state) || \
               (mhd_DAEMON_STATE_STARTING == d->state));
   mhd_assert (mhd_thread_handle_ID_is_valid_handle (d->threading.tid));
 
   d->threading.stop_requested = true;
 
   mhd_daemon_trigger_itc (d);
   if (! mhd_thread_handle_ID_join_thread (d->threading.tid))
   {
     mhd_LOG_MSG (d, MHD_SC_DAEMON_THREAD_STOP_ERROR, \
                  "Failed to stop daemon main thread.");
   }
 }
 
 
 /**
  * Stop all worker threads in the thread pool.
  * Must be called only for master daemons with thread pool.
  * @param d the daemon object, the workers threads must be running
  * @param num_workers the number of threads to stop
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 stop_worker_pool_threads (struct MHD_Daemon *restrict d,
                           unsigned int num_workers)
 {
   unsigned int i;
   mhd_assert (mhd_D_TYPE_HAS_WORKERS (d->threading.d_type));
   mhd_assert (NULL != d->threading.hier.pool.workers);
   mhd_assert (0 != d->threading.hier.pool.num);
   mhd_assert (d->dbg.thread_pool_inited);
   mhd_assert (2 <= d->threading.hier.pool.num);
   mhd_assert ((num_workers == d->threading.hier.pool.num) || \
               (mhd_DAEMON_STATE_STARTING == d->state));
   mhd_assert ((mhd_DAEMON_STATE_STOPPING == d->state) || \
               (mhd_DAEMON_STATE_STARTING == d->state));
 
   /* Process all the threads in the reverse order */
 
   /* Trigger all threads */
   for (i = num_workers - 1; num_workers > i; --i)
   { /* Note: loop exits after underflow of 'i' */
     d->threading.hier.pool.workers[i].threading.stop_requested = true;
     mhd_assert (mhd_ITC_IS_VALID ( \
                   d->threading.hier.pool.workers[i].threading.itc));
     mhd_daemon_trigger_itc (d->threading.hier.pool.workers + i);
   }
 
   /* Collect all threads */
   for (i = num_workers - 1; num_workers > i; --i)
   { /* Note: loop exits after underflow of 'i' */
     struct MHD_Daemon *const restrict worker =
       d->threading.hier.pool.workers + i;
     mhd_assert (mhd_thread_handle_ID_is_valid_handle (worker->threading.tid));
     if (! mhd_thread_handle_ID_join_thread (worker->threading.tid))
     {
       mhd_LOG_MSG (d, MHD_SC_DAEMON_THREAD_STOP_ERROR, \
                    "Failed to stop a worker thread.");
     }
   }
 }
 
 
 /**
  * Start the workers pool threads.
  * Must be called only for master daemons with thread pool.
  * @param d the daemon object, must be completely initialised
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 start_worker_pool_threads (struct MHD_Daemon *restrict d)
 {
   enum MHD_StatusCode res;
   unsigned int i;
 
   mhd_assert (d->dbg.threading_inited);
   mhd_assert (mhd_WM_INT_HAS_THREADS (d->wmode_int));
   mhd_assert (mhd_D_TYPE_IS_VALID (d->threading.d_type));
   mhd_assert (mhd_D_TYPE_HAS_WORKERS (d->threading.d_type));
   mhd_assert (d->dbg.thread_pool_inited);
   mhd_assert (2 <= d->threading.hier.pool.num);
 
   res = MHD_SC_OK;
 
   for (i = 0; d->threading.hier.pool.num > i; ++i)
   {
     res = start_individual_daemon_thread (d->threading.hier.pool.workers + i);
     if (MHD_SC_OK != res)
       break;
   }
   if (d->threading.hier.pool.num == i)
   {
     mhd_assert (MHD_SC_OK == res);
     return MHD_SC_OK;
   }
 
   stop_worker_pool_threads (d, i);
   mhd_assert (MHD_SC_OK != res);
   return res;
 }
 
 
 #endif /* MHD_SUPPORT_THREADS */
 
 /**
  * Start the daemon internal threads, if the daemon configured to use them.
  * @param d the daemon object, must be completely initialised
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 daemon_start_threads (struct MHD_Daemon *restrict d)
 {
   mhd_assert (d->dbg.net_inited);
   mhd_assert (! d->dbg.net_deinited);
   mhd_assert (d->dbg.threading_inited);
   mhd_assert (! mhd_D_TYPE_IS_INTERNAL_ONLY (d->threading.d_type));
   if (mhd_WM_INT_HAS_THREADS (d->wmode_int))
   {
 #ifdef MHD_SUPPORT_THREADS
     if (mhd_WM_INT_INTERNAL_EVENTS_THREAD_POOL != d->wmode_int)
     {
       mhd_assert (d->dbg.threading_inited);
       mhd_assert (mhd_DAEMON_TYPE_MASTER_CONTROL_ONLY != d->threading.d_type);
       return start_individual_daemon_thread (d);
     }
     else
     {
       mhd_assert (d->dbg.thread_pool_inited);
       mhd_assert (mhd_DAEMON_TYPE_MASTER_CONTROL_ONLY == d->threading.d_type);
       return start_worker_pool_threads (d);
     }
 #else  /* ! MHD_SUPPORT_THREADS */
     mhd_assert (0 && "Impossible value");
     mhd_UNREACHABLE ();
     return MHD_SC_INTERNAL_ERROR;
 #endif /* ! MHD_SUPPORT_THREADS */
   }
   return MHD_SC_OK;
 }
 
 
 /**
  * Stop the daemon internal threads, if the daemon configured to use them.
  * @param d the daemon object to stop threads
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 daemon_stop_threads (struct MHD_Daemon *restrict d)
 {
   mhd_assert (d->dbg.net_inited);
   mhd_assert (! d->dbg.net_deinited);
   mhd_assert (d->dbg.threading_inited);
   if (mhd_WM_INT_HAS_THREADS (d->wmode_int))
   {
 #ifdef MHD_SUPPORT_THREADS
     if (mhd_WM_INT_INTERNAL_EVENTS_THREAD_POOL != d->wmode_int)
     {
       mhd_assert (d->dbg.threading_inited);
       mhd_assert (! mhd_D_TYPE_HAS_WORKERS (d->threading.d_type));
       stop_individual_daemon_thread (d);
       return;
     }
     else
     {
       mhd_assert (d->dbg.thread_pool_inited);
       mhd_assert (mhd_D_TYPE_HAS_WORKERS (d->threading.d_type));
       stop_worker_pool_threads (d, d->threading.hier.pool.num);
       return;
     }
 #else  /* ! MHD_SUPPORT_THREADS */
     mhd_UNREACHABLE ();
     return;
 #endif /* ! MHD_SUPPORT_THREADS */
   }
 }
 
 
 /**
  * Close all daemon connections for modes without internal threads
  * @param d the daemon object
  */
 static MHD_FN_PAR_NONNULL_ (1) void
 daemon_close_connections (struct MHD_Daemon *restrict d)
 {
   if (mhd_WM_INT_HAS_THREADS (d->wmode_int))
   {
     /* In these modes connections must be closed in the daemon thread */
     mhd_assert (NULL == mhd_DLINKEDL_GET_LAST (&(d->conns),all_conn));
     return;
   }
 
   mhd_daemon_close_all_conns (d);
 }
 
 
 /**
  * Internal daemon initialisation function.
  * This function calls all required initialisation stages one-by-one.
  * @param d the daemon object
  * @param s the user settings
  * @return #MHD_SC_OK on success,
  *         the error code otherwise
  */
 static MHD_FN_PAR_NONNULL_ (1) MHD_FN_PAR_NONNULL_ (2)
 MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 daemon_start_internal (struct MHD_Daemon *restrict d,
                        struct DaemonOptions *restrict s)
 {
   enum MHD_StatusCode res;
 
   res = daemon_set_basic_settings (d, s);
   if (MHD_SC_OK != res)
     return res;
 
   res = daemon_set_work_mode (d, s);
   if (MHD_SC_OK != res)
     return res;
 
   res = daemon_init_net (d, s);
   if (MHD_SC_OK != res)
     return res;
 
   mhd_assert (d->dbg.net_inited);
 
   res = daemon_init_auth_digest (d, s);
 
   if (MHD_SC_OK == res)
   {
     res = daemon_init_tls (d, s);
     if (MHD_SC_OK == res)
     {
       mhd_assert (d->dbg.tls_inited);
       res = daemon_init_threading_and_conn (d, s);
       if (MHD_SC_OK == res)
       {
         mhd_assert (d->dbg.threading_inited);
         mhd_assert (! mhd_D_TYPE_IS_INTERNAL_ONLY (d->threading.d_type));
 
         res = daemon_init_large_buf (d, s);
         if (MHD_SC_OK == res)
         {
           res = daemon_start_threads (d);
           if (MHD_SC_OK == res)
           {
             return MHD_SC_OK;
           }
 
           /* Below is a clean-up path */
           daemon_deinit_large_buf (d);
         }
         daemon_deinit_threading_and_conn (d);
       }
       daemon_deinit_tls (d);
     }
     daemon_deinit_auth_digest (d);
   }
   daemon_deinit_net (d);
   mhd_assert (MHD_SC_OK != res);
   return res;
 }
 
 
 MHD_EXTERN_
 MHD_FN_PAR_NONNULL_ (1) MHD_FN_MUST_CHECK_RESULT_ enum MHD_StatusCode
 MHD_daemon_start (struct MHD_Daemon *daemon)
 {
   struct MHD_Daemon *const d = daemon; /* a short alias */
   struct DaemonOptions *const s = daemon->settings; /* a short alias */
   enum MHD_StatusCode res;
 
   if (mhd_DAEMON_STATE_NOT_STARTED != daemon->state)
     return MHD_SC_TOO_LATE;
 
   mhd_assert (NULL != s);
 
   d->state = mhd_DAEMON_STATE_STARTING;
   res = daemon_start_internal (d, s);
 
   d->settings = NULL;
   dsettings_release (s);
 
   d->state =
     (MHD_SC_OK == res) ? mhd_DAEMON_STATE_STARTED : mhd_DAEMON_STATE_FAILED;
 
   return res;
 }
 
 
 MHD_EXTERN_ MHD_FN_PAR_NONNULL_ALL_ void
 MHD_daemon_destroy (struct MHD_Daemon *daemon)
 {
   bool not_yet_started = (mhd_DAEMON_STATE_NOT_STARTED == daemon->state);
   bool has_failed = (mhd_DAEMON_STATE_FAILED == daemon->state);
   mhd_assert (mhd_DAEMON_STATE_STOPPING > daemon->state);
   mhd_assert (mhd_DAEMON_STATE_STARTING != daemon->state);
 
   daemon->state = mhd_DAEMON_STATE_STOPPING;
   if (not_yet_started)
   {
     mhd_assert (NULL != daemon->settings);
     dsettings_release (daemon->settings);
   }
   else if (! has_failed)
   {
     mhd_assert (NULL == daemon->settings);
     mhd_assert (daemon->dbg.threading_inited);
 
     daemon_stop_threads (daemon);
 
     daemon_close_connections (daemon);
 
     daemon_deinit_threading_and_conn (daemon);
 
     daemon_deinit_large_buf (daemon);
 
     daemon_deinit_tls (daemon);
 
     daemon_deinit_auth_digest (daemon);
 
     daemon_deinit_net (daemon);
   }
   daemon->state = mhd_DAEMON_STATE_STOPPED; /* Useful only for debugging */
 
   free (daemon);
 
   mhd_lib_deinit_global_if_needed ();
 }