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#***************************************************************************
#                                  _   _ ____  _
#  Project                     ___| | | |  _ \| |
#                             / __| | | | |_) | |
#                            | (__| |_| |  _ <| |___
#                             \___|\___/|_| \_\_____|
#
# Copyright (C) 1998 - 2008, Daniel Stenberg, <daniel@haxx.se>, et al.
#
# This software is licensed as described in the file COPYING, which
# you should have received as part of this distribution. The terms
# are also available at http://curl.haxx.se/docs/copyright.html.
#
# You may opt to use, copy, modify, merge, publish, distribute and/or sell
# copies of the Software, and permit persons to whom the Software is
# furnished to do so, under the terms of the COPYING file.
#
# This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
# KIND, either express or implied.
#
# $Id$
#***************************************************************************

# File version for 'aclocal' use. Keep it a single number.
# serial 21


dnl CURL_INCLUDES_ARPA_INET
dnl -------------------------------------------------
dnl Set up variable with list of headers that must be
dnl included when arpa/inet.h is to be included.

AC_DEFUN([CURL_INCLUDES_ARPA_INET], [
curl_includes_arpa_inet="\
/* includes start */
#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_ARPA_INET_H
#  include <arpa_inet.h>
#endif
/* includes end */"
  AC_CHECK_HEADERS(
    sys/types.h sys/socket.h netinet/in.h arpa/inet.h,
    [], [], [$curl_includes_arpa_inet])
])


dnl CURL_INCLUDES_NETDB
dnl -------------------------------------------------
dnl Set up variable with list of headers that must be
dnl included when netdb.h is to be included.

AC_DEFUN([CURL_INCLUDES_NETDB], [
curl_includes_netdb="\
/* includes start */
#ifdef HAVE_SYS_TYPES_H
#  include <sys/types.h>
#endif
#ifdef HAVE_NETDB_H
#  include <netdb.h>
#endif
/* includes end */"
  AC_CHECK_HEADERS(
    sys/types.h netdb.h,
    [], [], [$curl_includes_netdb])
])
dnl CURL_INCLUDES_SIGNAL
dnl -------------------------------------------------
dnl Set up variable with list of headers that must be
dnl included when signal.h is to be included.

AC_DEFUN([CURL_INCLUDES_SIGNAL], [
curl_includes_signal="\
/* includes start */
#ifdef HAVE_SYS_TYPES_H
#  include <sys/types.h>
#endif
#ifdef HAVE_SIGNAL_H
#  include <signal.h>
#endif
/* includes end */"
  AC_CHECK_HEADERS(
    sys/types.h signal.h,
    [], [], [$curl_includes_signal])
])


dnl CURL_INCLUDES_STDIO
dnl -------------------------------------------------
dnl Set up variable with list of headers that must be
dnl included when stdio.h is to be included.

AC_DEFUN([CURL_INCLUDES_STDIO], [
curl_includes_stdio="\
/* includes start */
#ifdef HAVE_SYS_TYPES_H
#  include <sys/types.h>
#endif
#ifdef HAVE_STDIO_H
#  include <stdio.h>
#endif
/* includes end */"
  AC_CHECK_HEADERS(
    sys/types.h stdio.h,
    [], [], [$curl_includes_stdio])
])


dnl CURL_INCLUDES_STDLIB
dnl -------------------------------------------------
dnl Set up variable with list of headers that must be
dnl included when stdlib.h is to be included.

AC_DEFUN([CURL_INCLUDES_STDLIB], [
curl_includes_stdlib="\
/* includes start */
#ifdef HAVE_SYS_TYPES_H
#  include <sys/types.h>
#endif
#ifdef HAVE_STDLIB_H
#  include <stdlib.h>
#endif
/* includes end */"
  AC_CHECK_HEADERS(
    sys/types.h stdlib.h,
    [], [], [$curl_includes_stdlib])
])


dnl CURL_INCLUDES_STRING
dnl -------------------------------------------------
dnl Set up variable with list of headers that must be
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dnl included when string(s).h is to be included.

AC_DEFUN([CURL_INCLUDES_STRING], [
curl_includes_string="\
/* includes start */
#ifdef HAVE_SYS_TYPES_H
#  include <sys/types.h>
#endif
#ifdef HAVE_STRING_H
#  include <string.h>
#endif
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#ifdef HAVE_STRINGS_H
#  include <strings.h>
#endif
/* includes end */"
  AC_CHECK_HEADERS(
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    sys/types.h string.h strings.h,
    [], [], [$curl_includes_string])
])


dnl CURL_INCLUDES_SYS_UIO
dnl -------------------------------------------------
dnl Set up variable with list of headers that must be
dnl included when sys/uio.h is to be included.

AC_DEFUN([CURL_INCLUDES_SYS_UIO], [
curl_includes_sys_uio="\
/* includes start */
#ifdef HAVE_SYS_TYPES_H
#  include <sys/types.h>
#endif
#ifdef HAVE_SYS_UIO_H
#  include <sys/uio.h>
#endif
/* includes end */"
  AC_CHECK_HEADERS(
    sys/types.h sys/uio.h,
    [], [], [$curl_includes_sys_uio])
])


dnl CURL_INCLUDES_TIME
dnl -------------------------------------------------
dnl Set up variable with list of headers that must be
dnl included when time.h is to be included.

AC_DEFUN([CURL_INCLUDES_TIME], [
AC_REQUIRE([AC_HEADER_TIME])dnl
curl_includes_time="\
/* includes start */
#ifdef HAVE_SYS_TYPES_H
#  include <sys/types.h>
#endif
#ifdef HAVE_SYS_TIME_H
#  include <sys/time.h>
#  ifdef TIME_WITH_SYS_TIME
#    include <time.h>
#  endif
#else
#  ifdef HAVE_TIME_H
#    include <time.h>
#  endif
#endif
/* includes end */"
  AC_CHECK_HEADERS(
    sys/types.h sys/time.h time.h,
    [], [], [$curl_includes_time])
])


dnl CURL_INCLUDES_UNISTD
dnl -------------------------------------------------
dnl Set up variable with list of headers that must be
dnl included when unistd.h is to be included.

AC_DEFUN([CURL_INCLUDES_UNISTD], [
curl_includes_unistd="\
/* includes start */
#ifdef HAVE_SYS_TYPES_H
#  include <sys/types.h>
#endif
#ifdef HAVE_UNISTD_H
#  include <unistd.h>
#endif
/* includes end */"
  AC_CHECK_HEADERS(
    sys/types.h unistd.h,
    [], [], [$curl_includes_unistd])
])


dnl CURL_INCLUDES_WINSOCK2
dnl -------------------------------------------------
dnl Set up variable with list of headers that must be
dnl included when winsock(2).h is to be included.

AC_DEFUN([CURL_INCLUDES_WINSOCK2], [
curl_includes_winsock2="\
/* includes start */
#ifdef HAVE_WINDOWS_H
#  ifndef WIN32_LEAN_AND_MEAN
#    define WIN32_LEAN_AND_MEAN
#  endif
#  include <windows.h>
#  ifdef HAVE_WINSOCK2_H
#    include <winsock2.h>
#  else
#    ifdef HAVE_WINSOCK_H
#      include <winsock.h>
#    endif
#  endif
#endif
/* includes end */"
  CURL_CHECK_HEADER_WINDOWS
  CURL_CHECK_HEADER_WINSOCK
  CURL_CHECK_HEADER_WINSOCK2
])


dnl CURL_CHECK_FUNC_ALARM
dnl -------------------------------------------------
dnl Verify if alarm is available, prototyped, and
dnl can be compiled. If all of these are true, and
dnl usage has not been previously disallowed with
dnl shell variable curl_disallow_alarm, then
dnl HAVE_ALARM will be defined.

AC_DEFUN([CURL_CHECK_FUNC_ALARM], [
  AC_REQUIRE([CURL_INCLUDES_UNISTD])dnl
  #
  tst_links_alarm="unknown"
  tst_proto_alarm="unknown"
  tst_compi_alarm="unknown"
  tst_allow_alarm="unknown"
  #
  AC_MSG_CHECKING([if alarm can be linked])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([alarm])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_alarm="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_alarm="no"
  ])
  #
  if test "$tst_links_alarm" = "yes"; then
    AC_MSG_CHECKING([if alarm is prototyped])
    AC_EGREP_CPP([alarm],[
      $curl_includes_unistd
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_alarm="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_alarm="no"
    ])
  fi
  #
  if test "$tst_proto_alarm" = "yes"; then
    AC_MSG_CHECKING([if alarm is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_unistd
      ]],[[
        if(0 != alarm(0))
          return 1;
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_alarm="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_alarm="no"
    ])
  fi
  #
  if test "$tst_compi_alarm" = "yes"; then
    AC_MSG_CHECKING([if alarm usage allowed])
    if test "x$curl_disallow_alarm" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_alarm="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_alarm="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if alarm might be used])
  if test "$tst_links_alarm" = "yes" &&
     test "$tst_proto_alarm" = "yes" &&
     test "$tst_compi_alarm" = "yes" &&
     test "$tst_allow_alarm" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_ALARM, 1,
      [Define to 1 if you have the alarm function.])
    ac_cv_func_alarm="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_alarm="no"
  fi
])


dnl CURL_CHECK_FUNC_FDOPEN
dnl -------------------------------------------------
dnl Verify if fdopen is available, prototyped, and
dnl can be compiled. If all of these are true, and
dnl usage has not been previously disallowed with
dnl shell variable curl_disallow_fdopen, then
dnl HAVE_FDOPEN will be defined.

AC_DEFUN([CURL_CHECK_FUNC_FDOPEN], [
  AC_REQUIRE([CURL_INCLUDES_STDIO])dnl
  #
  tst_links_fdopen="unknown"
  tst_proto_fdopen="unknown"
  tst_compi_fdopen="unknown"
  tst_allow_fdopen="unknown"
  #
  AC_MSG_CHECKING([if fdopen can be linked])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([fdopen])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_fdopen="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_fdopen="no"
  ])
  #
  if test "$tst_links_fdopen" = "yes"; then
    AC_MSG_CHECKING([if fdopen is prototyped])
    AC_EGREP_CPP([fdopen],[
      $curl_includes_stdio
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_fdopen="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_fdopen="no"
    ])
  fi
  #
  if test "$tst_proto_fdopen" = "yes"; then
    AC_MSG_CHECKING([if fdopen is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_stdio
      ]],[[
        if(0 != fdopen(0, 0))
          return 1;
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_fdopen="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_fdopen="no"
    ])
  fi
  #
  if test "$tst_compi_fdopen" = "yes"; then
    AC_MSG_CHECKING([if fdopen usage allowed])
    if test "x$curl_disallow_fdopen" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_fdopen="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_fdopen="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if fdopen might be used])
  if test "$tst_links_fdopen" = "yes" &&
     test "$tst_proto_fdopen" = "yes" &&
     test "$tst_compi_fdopen" = "yes" &&
     test "$tst_allow_fdopen" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_FDOPEN, 1,
      [Define to 1 if you have the fdopen function.])
    ac_cv_func_fdopen="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_fdopen="no"
  fi
])


dnl CURL_CHECK_FUNC_FTRUNCATE
dnl -------------------------------------------------
dnl Verify if ftruncate is available, prototyped, and
dnl can be compiled. If all of these are true, and
dnl usage has not been previously disallowed with
dnl shell variable curl_disallow_ftruncate, then
dnl HAVE_FTRUNCATE will be defined.

AC_DEFUN([CURL_CHECK_FUNC_FTRUNCATE], [
  AC_REQUIRE([CURL_INCLUDES_UNISTD])dnl
  #
  tst_links_ftruncate="unknown"
  tst_proto_ftruncate="unknown"
  tst_compi_ftruncate="unknown"
  tst_allow_ftruncate="unknown"
  #
  AC_MSG_CHECKING([if ftruncate can be linked])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([ftruncate])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_ftruncate="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_ftruncate="no"
  ])
  #
  if test "$tst_links_ftruncate" = "yes"; then
    AC_MSG_CHECKING([if ftruncate is prototyped])
    AC_EGREP_CPP([ftruncate],[
      $curl_includes_unistd
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_ftruncate="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_ftruncate="no"
    ])
  fi
  #
  if test "$tst_proto_ftruncate" = "yes"; then
    AC_MSG_CHECKING([if ftruncate is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_unistd
      ]],[[
        if(0 != ftruncate(0, 0))
          return 1;
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_ftruncate="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_ftruncate="no"
    ])
  fi
  #
  if test "$tst_compi_ftruncate" = "yes"; then
    AC_MSG_CHECKING([if ftruncate usage allowed])
    if test "x$curl_disallow_ftruncate" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_ftruncate="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_ftruncate="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if ftruncate might be used])
  if test "$tst_links_ftruncate" = "yes" &&
     test "$tst_proto_ftruncate" = "yes" &&
     test "$tst_compi_ftruncate" = "yes" &&
     test "$tst_allow_ftruncate" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_FTRUNCATE, 1,
      [Define to 1 if you have the ftruncate function.])
    ac_cv_func_ftruncate="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_ftruncate="no"
  fi
])


dnl CURL_CHECK_FUNC_GETHOSTBYADDR_R
dnl -------------------------------------------------
dnl Verify if gethostbyaddr_r is available, prototyped,
dnl and can be compiled. If all of these are true, and
dnl usage has not been previously disallowed with
dnl shell variable curl_disallow_gethostbyaddr_r, then
dnl HAVE_GETHOSTBYADDR_R will be defined.

AC_DEFUN([CURL_CHECK_FUNC_GETHOSTBYADDR_R], [
  AC_REQUIRE([CURL_INCLUDES_NETDB])dnl
  #
  tst_links_gethostbyaddr_r="unknown"
  tst_proto_gethostbyaddr_r="unknown"
  tst_compi_gethostbyaddr_r="unknown"
  tst_allow_gethostbyaddr_r="unknown"
  tst_nargs_gethostbyaddr_r="unknown"
  #
  AC_MSG_CHECKING([if gethostbyaddr_r can be linked])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([gethostbyaddr_r])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_gethostbyaddr_r="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_gethostbyaddr_r="no"
  ])
  #
  if test "$tst_links_gethostbyaddr_r" = "yes"; then
    AC_MSG_CHECKING([if gethostbyaddr_r is prototyped])
    AC_EGREP_CPP([gethostbyaddr_r],[
      $curl_includes_netdb
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_gethostbyaddr_r="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_gethostbyaddr_r="no"
    ])
  fi
  #
  if test "$tst_proto_gethostbyaddr_r" = "yes"; then
    if test "$tst_nargs_gethostbyaddr_r" = "unknown"; then
      AC_MSG_CHECKING([if gethostbyaddr_r takes 5 args.])
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM([[
          $curl_includes_netdb
        ]],[[
          if(0 != gethostbyaddr_r(0, 0, 0, 0, 0))
            return 1;
        ]])
      ],[
        AC_MSG_RESULT([yes])
        tst_compi_gethostbyaddr_r="yes"
        tst_nargs_gethostbyaddr_r="5"
      ],[
        AC_MSG_RESULT([no])
        tst_compi_gethostbyaddr_r="no"
      ])
    fi
    if test "$tst_nargs_gethostbyaddr_r" = "unknown"; then
      AC_MSG_CHECKING([if gethostbyaddr_r takes 7 args.])
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM([[
          $curl_includes_netdb
        ]],[[
          if(0 != gethostbyaddr_r(0, 0, 0, 0, 0, 0, 0))
            return 1;
        ]])
      ],[
        AC_MSG_RESULT([yes])
        tst_compi_gethostbyaddr_r="yes"
        tst_nargs_gethostbyaddr_r="7"
      ],[
        AC_MSG_RESULT([no])
        tst_compi_gethostbyaddr_r="no"
      ])
    fi
    if test "$tst_nargs_gethostbyaddr_r" = "unknown"; then
      AC_MSG_CHECKING([if gethostbyaddr_r takes 8 args.])
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM([[
          $curl_includes_netdb
        ]],[[
          if(0 != gethostbyaddr_r(0, 0, 0, 0, 0, 0, 0, 0))
            return 1;
        ]])
      ],[
        AC_MSG_RESULT([yes])
        tst_compi_gethostbyaddr_r="yes"
        tst_nargs_gethostbyaddr_r="8"
      ],[
        AC_MSG_RESULT([no])
        tst_compi_gethostbyaddr_r="no"
      ])
    fi
    AC_MSG_CHECKING([if gethostbyaddr_r is compilable])
    if test "$tst_compi_gethostbyaddr_r" = "yes"; then
      AC_MSG_RESULT([yes])
    else
      AC_MSG_RESULT([no])
    fi
  fi
  #
  if test "$tst_compi_gethostbyaddr_r" = "yes"; then
    AC_MSG_CHECKING([if gethostbyaddr_r usage allowed])
    if test "x$curl_disallow_gethostbyaddr_r" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_gethostbyaddr_r="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_gethostbyaddr_r="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if gethostbyaddr_r might be used])
  if test "$tst_links_gethostbyaddr_r" = "yes" &&
     test "$tst_proto_gethostbyaddr_r" = "yes" &&
     test "$tst_compi_gethostbyaddr_r" = "yes" &&
     test "$tst_allow_gethostbyaddr_r" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_GETHOSTBYADDR_R, 1,
      [Define to 1 if you have the gethostbyaddr_r function.])
    dnl AC_DEFINE_UNQUOTED(GETHOSTBYADDR_R_ARGS, $tst_nargs_gethostbyaddr_r,
    dnl   [Specifies the number of arguments to gethostbyaddr_r])
    #
    if test "$tst_nargs_gethostbyaddr_r" -eq "5"; then
      AC_DEFINE(HAVE_GETHOSTBYADDR_R_5, 1, [gethostbyaddr_r() takes 5 args])
    elif test "$tst_nargs_gethostbyaddr_r" -eq "7"; then
      AC_DEFINE(HAVE_GETHOSTBYADDR_R_7, 1, [gethostbyaddr_r() takes 7 args])
    elif test "$tst_nargs_gethostbyaddr_r" -eq "8"; then
      AC_DEFINE(HAVE_GETHOSTBYADDR_R_8, 1, [gethostbyaddr_r() takes 8 args])
    fi
    #
    ac_cv_func_gethostbyaddr_r="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_gethostbyaddr_r="no"
  fi
])


dnl CURL_CHECK_FUNC_GETHOSTBYNAME_R
dnl -------------------------------------------------
dnl Verify if gethostbyname_r is available, prototyped,
dnl and can be compiled. If all of these are true, and
dnl usage has not been previously disallowed with
dnl shell variable curl_disallow_gethostbyname_r, then
dnl HAVE_GETHOSTBYNAME_R will be defined.

AC_DEFUN([CURL_CHECK_FUNC_GETHOSTBYNAME_R], [
  AC_REQUIRE([CURL_INCLUDES_NETDB])dnl
  #
  tst_links_gethostbyname_r="unknown"
  tst_proto_gethostbyname_r="unknown"
  tst_compi_gethostbyname_r="unknown"
  tst_allow_gethostbyname_r="unknown"
  tst_nargs_gethostbyname_r="unknown"
  #
  AC_MSG_CHECKING([if gethostbyname_r can be linked])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([gethostbyname_r])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_gethostbyname_r="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_gethostbyname_r="no"
  ])
  #
  if test "$tst_links_gethostbyname_r" = "yes"; then
    AC_MSG_CHECKING([if gethostbyname_r is prototyped])
    AC_EGREP_CPP([gethostbyname_r],[
      $curl_includes_netdb
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_gethostbyname_r="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_gethostbyname_r="no"
    ])
  fi
  #
  if test "$tst_proto_gethostbyname_r" = "yes"; then
    if test "$tst_nargs_gethostbyname_r" = "unknown"; then
      AC_MSG_CHECKING([if gethostbyname_r takes 3 args.])
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM([[
          $curl_includes_netdb
        ]],[[
          if(0 != gethostbyname_r(0, 0, 0))
            return 1;
        ]])
      ],[
        AC_MSG_RESULT([yes])
        tst_compi_gethostbyname_r="yes"
        tst_nargs_gethostbyname_r="3"
      ],[
        AC_MSG_RESULT([no])
        tst_compi_gethostbyname_r="no"
      ])
    fi
    if test "$tst_nargs_gethostbyname_r" = "unknown"; then
      AC_MSG_CHECKING([if gethostbyname_r takes 5 args.])
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM([[
          $curl_includes_netdb
        ]],[[
          if(0 != gethostbyname_r(0, 0, 0, 0, 0))
            return 1;
        ]])
      ],[
        AC_MSG_RESULT([yes])
        tst_compi_gethostbyname_r="yes"
        tst_nargs_gethostbyname_r="5"
      ],[
        AC_MSG_RESULT([no])
        tst_compi_gethostbyname_r="no"
      ])
    fi
    if test "$tst_nargs_gethostbyname_r" = "unknown"; then
      AC_MSG_CHECKING([if gethostbyname_r takes 6 args.])
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM([[
          $curl_includes_netdb
        ]],[[
          if(0 != gethostbyname_r(0, 0, 0, 0, 0, 0))
            return 1;
        ]])
      ],[
        AC_MSG_RESULT([yes])
        tst_compi_gethostbyname_r="yes"
        tst_nargs_gethostbyname_r="6"
      ],[
        AC_MSG_RESULT([no])
        tst_compi_gethostbyname_r="no"
      ])
    fi
    AC_MSG_CHECKING([if gethostbyname_r is compilable])
    if test "$tst_compi_gethostbyname_r" = "yes"; then
      AC_MSG_RESULT([yes])
    else
      AC_MSG_RESULT([no])
    fi
  fi
  #
  if test "$tst_compi_gethostbyname_r" = "yes"; then
    AC_MSG_CHECKING([if gethostbyname_r usage allowed])
    if test "x$curl_disallow_gethostbyname_r" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_gethostbyname_r="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_gethostbyname_r="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if gethostbyname_r might be used])
  if test "$tst_links_gethostbyname_r" = "yes" &&
     test "$tst_proto_gethostbyname_r" = "yes" &&
     test "$tst_compi_gethostbyname_r" = "yes" &&
     test "$tst_allow_gethostbyname_r" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_GETHOSTBYNAME_R, 1,
      [Define to 1 if you have the gethostbyname_r function.])
    dnl AC_DEFINE_UNQUOTED(GETHOSTBYNAME_R_ARGS, $tst_nargs_gethostbyname_r,
    dnl   [Specifies the number of arguments to gethostbyname_r])
    #
    if test "$tst_nargs_gethostbyname_r" -eq "3"; then
      AC_DEFINE(HAVE_GETHOSTBYNAME_R_3, 1, [gethostbyname_r() takes 3 args])
    elif test "$tst_nargs_gethostbyname_r" -eq "5"; then
      AC_DEFINE(HAVE_GETHOSTBYNAME_R_5, 1, [gethostbyname_r() takes 5 args])
    elif test "$tst_nargs_gethostbyname_r" -eq "6"; then
      AC_DEFINE(HAVE_GETHOSTBYNAME_R_6, 1, [gethostbyname_r() takes 6 args])
    fi
    #
    ac_cv_func_gethostbyname_r="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_gethostbyname_r="no"
  fi
])


dnl CURL_CHECK_FUNC_GETHOSTNAME
dnl -------------------------------------------------
dnl Verify if gethostname is available, prototyped, and
dnl can be compiled. If all of these are true, and
dnl usage has not been previously disallowed with
dnl shell variable curl_disallow_gethostname, then
dnl HAVE_GETHOSTNAME will be defined.

AC_DEFUN([CURL_CHECK_FUNC_GETHOSTNAME], [
  AC_REQUIRE([CURL_INCLUDES_WINSOCK2])dnl
  AC_REQUIRE([CURL_INCLUDES_UNISTD])dnl
  #
  tst_links_gethostname="unknown"
  tst_proto_gethostname="unknown"
  tst_compi_gethostname="unknown"
  tst_allow_gethostname="unknown"
  #
  AC_MSG_CHECKING([if gethostname can be linked])
  AC_LINK_IFELSE([
    AC_LANG_PROGRAM([[
      $curl_includes_winsock2
      $curl_includes_unistd
    ]],[[
      if(0 != gethostname(0, 0))
        return 1;
    ]])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_gethostname="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_gethostname="no"
  ])
  #
  if test "$tst_links_gethostname" = "yes"; then
    AC_MSG_CHECKING([if gethostname is prototyped])
    AC_EGREP_CPP([gethostname],[
      $curl_includes_winsock2
      $curl_includes_unistd
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_gethostname="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_gethostname="no"
    ])
  fi
  #
  if test "$tst_proto_gethostname" = "yes"; then
    AC_MSG_CHECKING([if gethostname is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_winsock2
        $curl_includes_unistd
      ]],[[
        if(0 != gethostname(0, 0))
          return 1;
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_gethostname="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_gethostname="no"
    ])
  fi
  #
  if test "$tst_compi_gethostname" = "yes"; then
    AC_MSG_CHECKING([if gethostname usage allowed])
    if test "x$curl_disallow_gethostname" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_gethostname="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_gethostname="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if gethostname might be used])
  if test "$tst_links_gethostname" = "yes" &&
     test "$tst_proto_gethostname" = "yes" &&
     test "$tst_compi_gethostname" = "yes" &&
     test "$tst_allow_gethostname" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_GETHOSTNAME, 1,
      [Define to 1 if you have the gethostname function.])
    ac_cv_func_gethostname="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_gethostname="no"
  fi
])


dnl CURL_CHECK_FUNC_GETSERVBYPORT_R
dnl -------------------------------------------------
dnl Verify if getservbyport_r is available, prototyped,
dnl and can be compiled. If all of these are true, and
dnl usage has not been previously disallowed with
dnl shell variable curl_disallow_getservbyport_r, then
dnl HAVE_GETSERVBYPORT_R will be defined.

AC_DEFUN([CURL_CHECK_FUNC_GETSERVBYPORT_R], [
  AC_REQUIRE([CURL_INCLUDES_NETDB])dnl
  #
  tst_links_getservbyport_r="unknown"
  tst_proto_getservbyport_r="unknown"
  tst_compi_getservbyport_r="unknown"
  tst_allow_getservbyport_r="unknown"
  tst_nargs_getservbyport_r="unknown"
  #
  AC_MSG_CHECKING([if getservbyport_r can be linked])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([getservbyport_r])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_getservbyport_r="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_getservbyport_r="no"
  ])
  #
  if test "$tst_links_getservbyport_r" = "yes"; then
    AC_MSG_CHECKING([if getservbyport_r is prototyped])
    AC_EGREP_CPP([getservbyport_r],[
      $curl_includes_netdb
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_getservbyport_r="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_getservbyport_r="no"
    ])
  fi
  #
  if test "$tst_proto_getservbyport_r" = "yes"; then
    if test "$tst_nargs_getservbyport_r" = "unknown"; then
      AC_MSG_CHECKING([if getservbyport_r takes 4 args.])
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM([[
          $curl_includes_netdb
        ]],[[
          if(0 != getservbyport_r(0, 0, 0, 0))
            return 1;
        ]])
      ],[
        AC_MSG_RESULT([yes])
        tst_compi_getservbyport_r="yes"
        tst_nargs_getservbyport_r="4"
      ],[
        AC_MSG_RESULT([no])
        tst_compi_getservbyport_r="no"
      ])
    fi
    if test "$tst_nargs_getservbyport_r" = "unknown"; then
      AC_MSG_CHECKING([if getservbyport_r takes 5 args.])
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM([[
          $curl_includes_netdb
        ]],[[
          if(0 != getservbyport_r(0, 0, 0, 0, 0))
            return 1;
        ]])
      ],[
        AC_MSG_RESULT([yes])
        tst_compi_getservbyport_r="yes"
        tst_nargs_getservbyport_r="5"
      ],[
        AC_MSG_RESULT([no])
        tst_compi_getservbyport_r="no"
      ])
    fi
    if test "$tst_nargs_getservbyport_r" = "unknown"; then
      AC_MSG_CHECKING([if getservbyport_r takes 6 args.])
      AC_COMPILE_IFELSE([
        AC_LANG_PROGRAM([[
          $curl_includes_netdb
        ]],[[
          if(0 != getservbyport_r(0, 0, 0, 0, 0, 0))
            return 1;
        ]])
      ],[
        AC_MSG_RESULT([yes])
        tst_compi_getservbyport_r="yes"
        tst_nargs_getservbyport_r="6"
      ],[
        AC_MSG_RESULT([no])
        tst_compi_getservbyport_r="no"
      ])
    fi
    AC_MSG_CHECKING([if getservbyport_r is compilable])
    if test "$tst_compi_getservbyport_r" = "yes"; then
      AC_MSG_RESULT([yes])
    else
      AC_MSG_RESULT([no])
    fi
  fi
  #
  if test "$tst_compi_getservbyport_r" = "yes"; then
    AC_MSG_CHECKING([if getservbyport_r usage allowed])