m4/mhd_shutdown_socket_trigger.m4 - manifest_repos/libmicrohttpd - Git at Google

 # SYNOPSIS
 #
 #   MHD_CHECK_SOCKET_SHUTDOWN_TRIGGER([ACTION-IF-TRIGGER], [ACTION-IF-NOT],
 #                                     [ACTION-IF-UNKNOWN])
 #
 # DESCRIPTION
 #
 #   Check whether shutdown of listen socket triggers waiting select().
 #   If cross-compiling, result may be unknown (third action).
 #   Result is cached in $mhd_cv_host_shtdwn_trgr_select variable.
 #
 # LICENSE
 #
 #   Copyright (c) 2017-2023 Karlson2k (Evgeny Grin) <k2k@narod.ru>
 #
 #   Copying and distribution of this file, with or without modification, are
 #   permitted in any medium without royalty provided the copyright notice
 #   and this notice are preserved. This file is offered as-is, without any
 #   warranty.

 #serial 6

 AC_DEFUN([MHD_CHECK_SOCKET_SHUTDOWN_TRIGGER],[dnl
   AC_PREREQ([2.64])dnl
   AC_REQUIRE([AC_CANONICAL_HOST])dnl
   AC_REQUIRE([AC_PROG_CC])dnl
   AC_REQUIRE([AX_PTHREAD])dnl
   AC_REQUIRE([MHD_CHECK_FUNC_GETTIMEOFDAY])dnl
   MHD_CHECK_FUNC([[usleep]], [[#include <unistd.h>]], [[usleep(100000);]])
   MHD_CHECK_FUNC([[nanosleep]], [[#include <time.h>]], [[struct timespec ts2, ts1 = {0, 0}; nanosleep(&ts1, &ts2);]])
   AC_CHECK_HEADERS([string.h sys/types.h sys/socket.h netinet/in.h time.h sys/select.h netinet/tcp.h],[],[], [AC_INCLUDES_DEFAULT])
   AC_CACHE_CHECK([[whether shutdown of listen socket triggers select()]],
     [[mhd_cv_host_shtdwn_trgr_select]], [dnl
     _MHD_OS_KNOWN_SOCKET_SHUTDOWN_TRIGGER([[mhd_cv_host_shtdwn_trgr_select]])
     AS_VAR_IF([mhd_cv_host_shtdwn_trgr_select], [["maybe"]],
       [_MHD_RUN_CHECK_SOCKET_SHUTDOWN_TRIGGER([[mhd_cv_host_shtdwn_trgr_select]])])
     ]
   )
   AS_IF([[test "x$mhd_cv_host_shtdwn_trgr_select" = "xyes"]], [$1],
     [[test "x$mhd_cv_host_shtdwn_trgr_select" = "xno"]], [$2], [$3])
   ]
 )

 #
 # _MHD_OS_KNOWN_SOCKET_SHUTDOWN_TRIGGER(VAR)
 #
 # Sets VAR to 'yes', 'no' or 'maybe'.

 AC_DEFUN([_MHD_OS_KNOWN_SOCKET_SHUTDOWN_TRIGGER],[dnl
 [#] On Linux shutdown of listen socket always trigger select().
 [#] On Windows select() always ignore shutdown of listen socket.
 [#] On other paltforms result may vary depending on platform version.
   AS_CASE([[$host_os]],
     [[linux | linux-* | *-linux | *-linux-*]], [$1='yes'],
     [[mingw*]], [$1='no'],
     [[cygwin* | msys*]], [$1='no'],
     [[winnt* | interix*]], [$1='no'],
     [[mks]], [$1='no'],
     [[uwin]], [$1='no'],
     [$1='maybe']
   )
   ]
 )

 #
 # _MHD_RUN_CHECK_SOCKET_SHUTDOWN_TRIGGER(VAR)
 #
 # Sets VAR to 'yes', 'no' or 'guessing no'.

 AC_DEFUN([_MHD_RUN_CHECK_SOCKET_SHUTDOWN_TRIGGER],[dnl
   AC_LANG_PUSH([C])
   MHD_CST_SAVE_CC="$CC"
   MHD_CST_SAVE_CFLAGS="$CFLAGS"
   MHD_CST_SAVE_LIBS="$LIBS"
   CC="$PTHREAD_CC"
   CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
   LIBS="$PTHREAD_LIBS $LIBS"
   AC_RUN_IFELSE([AC_LANG_SOURCE([[
 #include <stdlib.h>

 #ifdef HAVE_UNISTD_H
 #  include <unistd.h>
 #endif
 #ifdef HAVE_TIME_H
 #  include <time.h>
 #endif
 #ifdef HAVE_STRING_H
 #  include <string.h>
 #endif

 #if !defined(_WIN32) || defined(__CYGWIN__)
 #  ifdef HAVE_SYS_TYPES_H
 #    include <sys/types.h>
 #  endif
 #  ifdef HAVE_SYS_SOCKET_H
 #    include <sys/socket.h>
 #  endif
 #  ifdef HAVE_NETINET_IN_H
 #    include <netinet/in.h>
 #  endif
 #  ifdef HAVE_SYS_TIME_H
 #    include <sys/time.h>
 #  endif
 #  ifdef HAVE_SYS_SELECT_H
 #    include <sys/select.h>
 #  endif
 #  ifdef HAVE_NETINET_TCP_H
 #    include <netinet/tcp.h>
 #  endif
    typedef int MHD_socket;
 #  define MHD_INVALID_SOCKET (-1)
 #  define MHD_POSIX_SOCKETS 1
 #else
 #  include <winsock2.h>
 #  include <ws2tcpip.h>
 #  include <windows.h>
    typedef SOCKET MHD_socket;
 #  define MHD_INVALID_SOCKET (INVALID_SOCKET)
 #  define MHD_WINSOCK_SOCKETS 1
 #endif

 #include <pthread.h>

 #ifndef SHUT_RD
 #  define SHUT_RD 0
 #endif
 #ifndef SHUT_WR
 #  define SHUT_WR 1
 #endif
 #ifndef SHUT_RDWR
 #  define SHUT_RDWR 2
 #endif

 #ifndef NULL
 #  define NULL ((void*)0)
 #endif

 #ifdef HAVE_GETTIMEOFDAY
 #  if defined(_WIN32) && !defined(__CYGWIN__)
 #    undef HAVE_GETTIMEOFDAY
 #  endif
 #endif


 #ifdef HAVE_NANOSLEEP
 static const struct timespec sm_tmout = {0, 1000};
 #  define short_sleep() nanosleep(&sm_tmout, NULL)
 #elif defined(HAVE_USLEEP)
 #  define short_sleep() usleep(1)
 #else
 #  define short_sleep() (void)0
 #endif

 static volatile int going_select = 0;
 static volatile int select_ends = 0;
 static volatile int gerror = 0;
 static int timeout_mils;

 #ifndef HAVE_GETTIMEOFDAY
 static volatile long long select_elapsed_time = 0;

 static long long time_chk(void)
 {
   long long ret = time(NULL);
   if (-1 == ret)
     gerror = 4;
   return ret;
 }
 #endif


 static void* select_thrd_func(void* param)
 {
 #ifndef HAVE_GETTIMEOFDAY
   long long start, stop;
 #endif
   fd_set rs;
   struct timeval tmot = {0, 0};
   MHD_socket fd = *((MHD_socket*)param);

   FD_ZERO(&rs);
   FD_SET(fd, &rs);
   tmot.tv_usec = timeout_mils * 1000;
 #ifndef HAVE_GETTIMEOFDAY
   start = time_chk();
 #endif
   going_select = 1;
   if (0 > select ((int)(fd) + 1, &rs, NULL, NULL, &tmot))
     gerror = 5;
 #ifndef HAVE_GETTIMEOFDAY
   stop = time_chk();
   select_elapsed_time = stop - start;
 #endif
   select_ends = 1;
   return NULL;
 }


 static MHD_socket create_socket(void)
 { return socket (AF_INET, SOCK_STREAM, 0); }

 static void close_socket(MHD_socket fd)
 {
 #ifdef MHD_POSIX_SOCKETS
   close(fd);
 #else
   closesocket(fd);
 #endif
 }

 static MHD_socket
 create_socket_listen(int port)
 {
   MHD_socket fd;
   struct sockaddr_in sock_addr;
   fd = create_socket();
   if (MHD_INVALID_SOCKET == fd)
     return fd;

   memset (&sock_addr, 0, sizeof (struct sockaddr_in));
   sock_addr.sin_family = AF_INET;
   sock_addr.sin_port = htons(port);
   sock_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);

   if (bind (fd, (const struct sockaddr*) &sock_addr, sizeof(sock_addr)) < 0 ||
       listen(fd, SOMAXCONN) < 0)
     {
       close_socket(fd);
       return MHD_INVALID_SOCKET;
     }
   return fd;
 }

 #ifdef HAVE_GETTIMEOFDAY
 #define diff_time(tv1, tv2) ((long long)(tv1.tv_sec-tv2.tv_sec)*10000 + (long long)(tv1.tv_usec-tv2.tv_usec)/100)
 #else
 #define diff_time(tv1, tv2) ((long long)(tv1-tv2))
 #endif

 static long long test_run_select(int timeout_millsec, int use_shutdown, long long delay_before_shutdown)
 {
   pthread_t select_thrd;
   MHD_socket fd;
 #ifdef HAVE_GETTIMEOFDAY
   struct timeval start, stop;
 #else
   long long start;
 #endif

   fd = create_socket_listen(0);
   if (MHD_INVALID_SOCKET == fd)
     return -7;
   going_select = 0;
   select_ends = 0;
   gerror = 0;
   timeout_mils = timeout_millsec;
   if (0 != pthread_create (&select_thrd, NULL, select_thrd_func, (void*)&fd))
     return -8;
   while (!going_select) {short_sleep();}
 #ifdef HAVE_GETTIMEOFDAY
   gettimeofday (&start, NULL);
 #else
   start = time_chk();
 #endif
   if (use_shutdown)
     {
 #ifdef HAVE_GETTIMEOFDAY
       struct timeval current;
       do {short_sleep(); gettimeofday(&current, NULL); } while (delay_before_shutdown > diff_time(current, start));
 #else
       while (delay_before_shutdown > time_chk() - start) {short_sleep();}
 #endif
       shutdown(fd, SHUT_RDWR);
     }
 #ifdef HAVE_GETTIMEOFDAY
   while (!select_ends) {short_sleep();}
   gettimeofday (&stop, NULL);
 #endif
   if (0 != pthread_join(select_thrd, NULL))
     return -9;
   close_socket(fd);
   if (gerror)
     return -10;
 #ifdef HAVE_GETTIMEOFDAY
   return (long long)diff_time(stop, start);
 #else
   return select_elapsed_time;
 #endif
 }

 static int test_it(void)
 {
   long long duration2;
 #ifdef HAVE_GETTIMEOFDAY
   long long duration0, duration1;
   duration0 = test_run_select(0, 0, 0);
   if (0 > duration0)
     return -duration0;

   duration1 = test_run_select(50, 0, 0);
   if (0 > duration1)
     return -duration1 + 20;

   duration2 = test_run_select(500, 1, (duration0 + duration1) / 2);
   if (0 > duration2)
     return -duration2 + 40;

   if (duration1 * 2 > duration2)
     { /* Check second time to be sure. */
       duration2 = test_run_select(500, 1, (duration0 + duration1) / 2);
       if (0 > duration2)
         return -duration2 + 60;
       if (duration1 * 2 > duration2)
         return 0;
     }
 #else
   duration2 = test_run_select(5000, 1, 2);
   if (0 > duration2)
     return -duration2 + 80;

   if (4 > duration2)
     { /* Check second time to be sure. */
       duration2 = test_run_select(5000, 1, 2);
       if (0 > duration2)
       return -duration2 + 100;
       if (4 > duration2)
         return 0;
     }
 #endif
   return 1;
 }


 static int init(void)
 {
 #ifdef MHD_WINSOCK_SOCKETS
   WSADATA wsa_data;

   if (0 != WSAStartup(MAKEWORD(2, 2), &wsa_data) || MAKEWORD(2, 2) != wsa_data.wVersion)
     {
       WSACleanup();
       return 0;
     }
 #endif /* MHD_WINSOCK_SOCKETS */
   return 1;
 }

 static void cleanup(void)
 {
 #ifdef MHD_WINSOCK_SOCKETS
   WSACleanup();
 #endif /* MHD_WINSOCK_SOCKETS */
 }

 int main(void)
 {
   int res;
   if (!init())
     return 19;

   res = test_it();

   cleanup();
   if (gerror)
     return gerror;

   return res;
 }
 ]])], [$1='yes'], [$1='no'], [$1='guessing no'])
   CC="$MHD_CST_SAVE_CC"
   CFLAGS="$MHD_CST_SAVE_CFLAGS"
   LIBS="$MHD_CST_SAVE_LIBS"
   AS_UNSET([[MHD_CST_SAVE_CC]])
   AS_UNSET([[MHD_CST_SAVE_CFLAGS]])
   AS_UNSET([[MHD_CST_SAVE_LIBS]])
   AC_LANG_POP([C])
   ]
 )
	# SYNOPSIS
	#
	# MHD_CHECK_SOCKET_SHUTDOWN_TRIGGER([ACTION-IF-TRIGGER], [ACTION-IF-NOT],
	# [ACTION-IF-UNKNOWN])
	#
	# DESCRIPTION
	#
	# Check whether shutdown of listen socket triggers waiting select().
	# If cross-compiling, result may be unknown (third action).
	# Result is cached in $mhd_cv_host_shtdwn_trgr_select variable.
	#
	# LICENSE
	#
	# Copyright (c) 2017-2023 Karlson2k (Evgeny Grin) <k2k@narod.ru>
	#
	# Copying and distribution of this file, with or without modification, are
	# permitted in any medium without royalty provided the copyright notice
	# and this notice are preserved. This file is offered as-is, without any
	# warranty.

	#serial 6

	AC_DEFUN([MHD_CHECK_SOCKET_SHUTDOWN_TRIGGER],[dnl
	AC_PREREQ([2.64])dnl
	AC_REQUIRE([AC_CANONICAL_HOST])dnl
	AC_REQUIRE([AC_PROG_CC])dnl
	AC_REQUIRE([AX_PTHREAD])dnl
	AC_REQUIRE([MHD_CHECK_FUNC_GETTIMEOFDAY])dnl
	MHD_CHECK_FUNC([[usleep]], [[#include <unistd.h>]], [[usleep(100000);]])
	MHD_CHECK_FUNC([[nanosleep]], [[#include <time.h>]], [[struct timespec ts2, ts1 = {0, 0}; nanosleep(&ts1, &ts2);]])
	AC_CHECK_HEADERS([string.h sys/types.h sys/socket.h netinet/in.h time.h sys/select.h netinet/tcp.h],[],[], [AC_INCLUDES_DEFAULT])
	AC_CACHE_CHECK([[whether shutdown of listen socket triggers select()]],
	[[mhd_cv_host_shtdwn_trgr_select]], [dnl
	_MHD_OS_KNOWN_SOCKET_SHUTDOWN_TRIGGER([[mhd_cv_host_shtdwn_trgr_select]])
	AS_VAR_IF([mhd_cv_host_shtdwn_trgr_select], [["maybe"]],
	[_MHD_RUN_CHECK_SOCKET_SHUTDOWN_TRIGGER([[mhd_cv_host_shtdwn_trgr_select]])])
	]
	)
	AS_IF([[test "x$mhd_cv_host_shtdwn_trgr_select" = "xyes"]], [$1],
	[[test "x$mhd_cv_host_shtdwn_trgr_select" = "xno"]], [$2], [$3])
	]
	)

	#
	# _MHD_OS_KNOWN_SOCKET_SHUTDOWN_TRIGGER(VAR)
	#
	# Sets VAR to 'yes', 'no' or 'maybe'.

	AC_DEFUN([_MHD_OS_KNOWN_SOCKET_SHUTDOWN_TRIGGER],[dnl
	[#] On Linux shutdown of listen socket always trigger select().
	[#] On Windows select() always ignore shutdown of listen socket.
	[#] On other paltforms result may vary depending on platform version.
	AS_CASE([[$host_os]],
	[[linux \| linux-* \| -linux \| -linux-*]], [$1='yes'],
	[[mingw*]], [$1='no'],
	[[cygwin* \| msys*]], [$1='no'],
	[[winnt* \| interix*]], [$1='no'],
	[[mks]], [$1='no'],
	[[uwin]], [$1='no'],
	[$1='maybe']
	)
	]
	)

	#
	# _MHD_RUN_CHECK_SOCKET_SHUTDOWN_TRIGGER(VAR)
	#
	# Sets VAR to 'yes', 'no' or 'guessing no'.

	AC_DEFUN([_MHD_RUN_CHECK_SOCKET_SHUTDOWN_TRIGGER],[dnl
	AC_LANG_PUSH([C])
	MHD_CST_SAVE_CC="$CC"
	MHD_CST_SAVE_CFLAGS="$CFLAGS"
	MHD_CST_SAVE_LIBS="$LIBS"
	CC="$PTHREAD_CC"
	CFLAGS="$CFLAGS $PTHREAD_CFLAGS"
	LIBS="$PTHREAD_LIBS $LIBS"
	AC_RUN_IFELSE([AC_LANG_SOURCE([[
	#include <stdlib.h>

	#ifdef HAVE_UNISTD_H
	# include <unistd.h>
	#endif
	#ifdef HAVE_TIME_H
	# include <time.h>
	#endif
	#ifdef HAVE_STRING_H
	# include <string.h>
	#endif

	#if !defined(_WIN32) \|\| defined(__CYGWIN__)
	# ifdef HAVE_SYS_TYPES_H
	# include <sys/types.h>
	# endif
	# ifdef HAVE_SYS_SOCKET_H
	# include <sys/socket.h>
	# endif
	# ifdef HAVE_NETINET_IN_H
	# include <netinet/in.h>
	# endif
	# ifdef HAVE_SYS_TIME_H
	# include <sys/time.h>
	# endif
	# ifdef HAVE_SYS_SELECT_H
	# include <sys/select.h>
	# endif
	# ifdef HAVE_NETINET_TCP_H
	# include <netinet/tcp.h>
	# endif
	typedef int MHD_socket;
	# define MHD_INVALID_SOCKET (-1)
	# define MHD_POSIX_SOCKETS 1
	#else
	# include <winsock2.h>
	# include <ws2tcpip.h>
	# include <windows.h>
	typedef SOCKET MHD_socket;
	# define MHD_INVALID_SOCKET (INVALID_SOCKET)
	# define MHD_WINSOCK_SOCKETS 1
	#endif

	#include <pthread.h>

	#ifndef SHUT_RD
	# define SHUT_RD 0
	#endif
	#ifndef SHUT_WR
	# define SHUT_WR 1
	#endif
	#ifndef SHUT_RDWR
	# define SHUT_RDWR 2
	#endif

	#ifndef NULL
	# define NULL ((void*)0)
	#endif

	#ifdef HAVE_GETTIMEOFDAY
	# if defined(_WIN32) && !defined(__CYGWIN__)
	# undef HAVE_GETTIMEOFDAY
	# endif
	#endif


	#ifdef HAVE_NANOSLEEP
	static const struct timespec sm_tmout = {0, 1000};
	# define short_sleep() nanosleep(&sm_tmout, NULL)
	#elif defined(HAVE_USLEEP)
	# define short_sleep() usleep(1)
	#else
	# define short_sleep() (void)0
	#endif

	static volatile int going_select = 0;
	static volatile int select_ends = 0;
	static volatile int gerror = 0;
	static int timeout_mils;

	#ifndef HAVE_GETTIMEOFDAY
	static volatile long long select_elapsed_time = 0;

	static long long time_chk(void)
	{
	long long ret = time(NULL);
	if (-1 == ret)
	gerror = 4;
	return ret;
	}
	#endif


	static void* select_thrd_func(void* param)
	{
	#ifndef HAVE_GETTIMEOFDAY
	long long start, stop;
	#endif
	fd_set rs;
	struct timeval tmot = {0, 0};
	MHD_socket fd = ((MHD_socket)param);

	FD_ZERO(&rs);
	FD_SET(fd, &rs);
	tmot.tv_usec = timeout_mils * 1000;
	#ifndef HAVE_GETTIMEOFDAY
	start = time_chk();
	#endif
	going_select = 1;
	if (0 > select ((int)(fd) + 1, &rs, NULL, NULL, &tmot))
	gerror = 5;
	#ifndef HAVE_GETTIMEOFDAY
	stop = time_chk();
	select_elapsed_time = stop - start;
	#endif
	select_ends = 1;
	return NULL;
	}


	static MHD_socket create_socket(void)
	{ return socket (AF_INET, SOCK_STREAM, 0); }

	static void close_socket(MHD_socket fd)
	{
	#ifdef MHD_POSIX_SOCKETS
	close(fd);
	#else
	closesocket(fd);
	#endif
	}

	static MHD_socket
	create_socket_listen(int port)
	{
	MHD_socket fd;
	struct sockaddr_in sock_addr;
	fd = create_socket();
	if (MHD_INVALID_SOCKET == fd)
	return fd;

	memset (&sock_addr, 0, sizeof (struct sockaddr_in));
	sock_addr.sin_family = AF_INET;
	sock_addr.sin_port = htons(port);
	sock_addr.sin_addr.s_addr = htonl(INADDR_LOOPBACK);

	if (bind (fd, (const struct sockaddr*) &sock_addr, sizeof(sock_addr)) < 0 \|\|
	listen(fd, SOMAXCONN) < 0)
	{
	close_socket(fd);
	return MHD_INVALID_SOCKET;
	}
	return fd;
	}

	#ifdef HAVE_GETTIMEOFDAY
	#define diff_time(tv1, tv2) ((long long)(tv1.tv_sec-tv2.tv_sec)*10000 + (long long)(tv1.tv_usec-tv2.tv_usec)/100)
	#else
	#define diff_time(tv1, tv2) ((long long)(tv1-tv2))
	#endif

	static long long test_run_select(int timeout_millsec, int use_shutdown, long long delay_before_shutdown)
	{
	pthread_t select_thrd;
	MHD_socket fd;
	#ifdef HAVE_GETTIMEOFDAY
	struct timeval start, stop;
	#else
	long long start;
	#endif

	fd = create_socket_listen(0);
	if (MHD_INVALID_SOCKET == fd)
	return -7;
	going_select = 0;
	select_ends = 0;
	gerror = 0;
	timeout_mils = timeout_millsec;
	if (0 != pthread_create (&select_thrd, NULL, select_thrd_func, (void*)&fd))
	return -8;
	while (!going_select) {short_sleep();}
	#ifdef HAVE_GETTIMEOFDAY
	gettimeofday (&start, NULL);
	#else
	start = time_chk();
	#endif
	if (use_shutdown)
	{
	#ifdef HAVE_GETTIMEOFDAY
	struct timeval current;
	do {short_sleep(); gettimeofday(&current, NULL); } while (delay_before_shutdown > diff_time(current, start));
	#else
	while (delay_before_shutdown > time_chk() - start) {short_sleep();}
	#endif
	shutdown(fd, SHUT_RDWR);
	}
	#ifdef HAVE_GETTIMEOFDAY
	while (!select_ends) {short_sleep();}
	gettimeofday (&stop, NULL);
	#endif
	if (0 != pthread_join(select_thrd, NULL))
	return -9;
	close_socket(fd);
	if (gerror)
	return -10;
	#ifdef HAVE_GETTIMEOFDAY
	return (long long)diff_time(stop, start);
	#else
	return select_elapsed_time;
	#endif
	}

	static int test_it(void)
	{
	long long duration2;
	#ifdef HAVE_GETTIMEOFDAY
	long long duration0, duration1;
	duration0 = test_run_select(0, 0, 0);
	if (0 > duration0)
	return -duration0;

	duration1 = test_run_select(50, 0, 0);
	if (0 > duration1)
	return -duration1 + 20;

	duration2 = test_run_select(500, 1, (duration0 + duration1) / 2);
	if (0 > duration2)
	return -duration2 + 40;

	if (duration1 * 2 > duration2)
	{ /* Check second time to be sure. */
	duration2 = test_run_select(500, 1, (duration0 + duration1) / 2);
	if (0 > duration2)
	return -duration2 + 60;
	if (duration1 * 2 > duration2)
	return 0;
	}
	#else
	duration2 = test_run_select(5000, 1, 2);
	if (0 > duration2)
	return -duration2 + 80;

	if (4 > duration2)
	{ /* Check second time to be sure. */
	duration2 = test_run_select(5000, 1, 2);
	if (0 > duration2)
	return -duration2 + 100;
	if (4 > duration2)
	return 0;
	}
	#endif
	return 1;
	}


	static int init(void)
	{
	#ifdef MHD_WINSOCK_SOCKETS
	WSADATA wsa_data;

	if (0 != WSAStartup(MAKEWORD(2, 2), &wsa_data) \|\| MAKEWORD(2, 2) != wsa_data.wVersion)
	{
	WSACleanup();
	return 0;
	}
	#endif /* MHD_WINSOCK_SOCKETS */
	return 1;
	}

	static void cleanup(void)
	{
	#ifdef MHD_WINSOCK_SOCKETS
	WSACleanup();
	#endif /* MHD_WINSOCK_SOCKETS */
	}

	int main(void)
	{
	int res;
	if (!init())
	return 19;

	res = test_it();

	cleanup();
	if (gerror)
	return gerror;

	return res;
	}
	]])], [$1='yes'], [$1='no'], [$1='guessing no'])
	CC="$MHD_CST_SAVE_CC"
	CFLAGS="$MHD_CST_SAVE_CFLAGS"
	LIBS="$MHD_CST_SAVE_LIBS"
	AS_UNSET([[MHD_CST_SAVE_CC]])
	AS_UNSET([[MHD_CST_SAVE_CFLAGS]])
	AS_UNSET([[MHD_CST_SAVE_LIBS]])
	AC_LANG_POP([C])
	]
	)