curl-functions.m4

    ],[
      AC_MSG_RESULT([no])
      tst_compi_fcntl_o_nonblock="no"
    ])
  fi
  #
  if test "$tst_compi_fcntl_o_nonblock" = "yes"; then
    AC_MSG_CHECKING([if fcntl O_NONBLOCK usage allowed])
    if test "x$curl_disallow_fcntl_o_nonblock" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_fcntl_o_nonblock="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_fcntl_o_nonblock="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if fcntl O_NONBLOCK might be used])
  if test "$tst_compi_fcntl_o_nonblock" = "yes" &&
     test "$tst_allow_fcntl_o_nonblock" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_FCNTL_O_NONBLOCK, 1,
      [Define to 1 if you have a working fcntl O_NONBLOCK function.])
    ac_cv_func_fcntl_o_nonblock="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_fcntl_o_nonblock="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_FREEADDRINFO
dnl -------------------------------------------------
dnl Verify if freeaddrinfo is available, prototyped,
dnl and can be compiled. If all of these are true,
dnl and usage has not been previously disallowed with
dnl shell variable curl_disallow_freeaddrinfo, then
dnl HAVE_FREEADDRINFO will be defined.

AC_DEFUN([CURL_CHECK_FUNC_FREEADDRINFO], [
  AC_REQUIRE([CURL_INCLUDES_WS2TCPIP])dnl
  AC_REQUIRE([CURL_INCLUDES_SYS_SOCKET])dnl
  AC_REQUIRE([CURL_INCLUDES_NETDB])dnl
  #
  tst_links_freeaddrinfo="unknown"
  tst_proto_freeaddrinfo="unknown"
  tst_compi_freeaddrinfo="unknown"
  tst_allow_freeaddrinfo="unknown"
  #
  AC_MSG_CHECKING([if freeaddrinfo can be linked])
  AC_LINK_IFELSE([
    AC_LANG_PROGRAM([[
      $curl_includes_ws2tcpip
      $curl_includes_sys_socket
      $curl_includes_netdb
    ]],[[
      freeaddrinfo(0);
    ]])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_freeaddrinfo="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_freeaddrinfo="no"
  ])
  #
  if test "$tst_links_freeaddrinfo" = "yes"; then
    AC_MSG_CHECKING([if freeaddrinfo is prototyped])
    AC_EGREP_CPP([freeaddrinfo],[
      $curl_includes_ws2tcpip
      $curl_includes_sys_socket
      $curl_includes_netdb
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_freeaddrinfo="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_freeaddrinfo="no"
    ])
  fi
  #
  if test "$tst_proto_freeaddrinfo" = "yes"; then
    AC_MSG_CHECKING([if freeaddrinfo is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_ws2tcpip
        $curl_includes_sys_socket
        $curl_includes_netdb
      ]],[[
        freeaddrinfo(0);
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_freeaddrinfo="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_freeaddrinfo="no"
    ])
  fi
  #
  if test "$tst_compi_freeaddrinfo" = "yes"; then
    AC_MSG_CHECKING([if freeaddrinfo usage allowed])
    if test "x$curl_disallow_freeaddrinfo" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_freeaddrinfo="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_freeaddrinfo="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if freeaddrinfo might be used])
  if test "$tst_links_freeaddrinfo" = "yes" &&
     test "$tst_proto_freeaddrinfo" = "yes" &&
     test "$tst_compi_freeaddrinfo" = "yes" &&
     test "$tst_allow_freeaddrinfo" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_FREEADDRINFO, 1,
      [Define to 1 if you have the freeaddrinfo function.])
    ac_cv_func_freeaddrinfo="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_freeaddrinfo="no"
  fi
])


dnl CURL_CHECK_FUNC_FREEIFADDRS
dnl -------------------------------------------------
dnl Verify if freeifaddrs 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_freeifaddrs, then
dnl HAVE_FREEIFADDRS will be defined.

AC_DEFUN([CURL_CHECK_FUNC_FREEIFADDRS], [
  AC_REQUIRE([CURL_INCLUDES_IFADDRS])dnl
  #
  tst_links_freeifaddrs="unknown"
  tst_proto_freeifaddrs="unknown"
  tst_compi_freeifaddrs="unknown"
  tst_allow_freeifaddrs="unknown"
  #
  AC_MSG_CHECKING([if freeifaddrs can be linked])
  AC_LINK_IFELSE([
    AC_LANG_FUNC_LINK_TRY([freeifaddrs])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_freeifaddrs="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_freeifaddrs="no"
  ])
  #
  if test "$tst_links_freeifaddrs" = "yes"; then
    AC_MSG_CHECKING([if freeifaddrs is prototyped])
    AC_EGREP_CPP([freeifaddrs],[
      $curl_includes_ifaddrs
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_freeifaddrs="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_freeifaddrs="no"
    ])
  fi
  #
  if test "$tst_proto_freeifaddrs" = "yes"; then
    AC_MSG_CHECKING([if freeifaddrs is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_ifaddrs
      ]],[[
        freeifaddrs(0);
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_freeifaddrs="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_freeifaddrs="no"
    ])
  fi
  #
  if test "$tst_compi_freeifaddrs" = "yes"; then
    AC_MSG_CHECKING([if freeifaddrs usage allowed])
    if test "x$curl_disallow_freeifaddrs" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_freeifaddrs="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_freeifaddrs="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if freeifaddrs might be used])
  if test "$tst_links_freeifaddrs" = "yes" &&
     test "$tst_proto_freeifaddrs" = "yes" &&
     test "$tst_compi_freeifaddrs" = "yes" &&
     test "$tst_allow_freeifaddrs" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_FREEIFADDRS, 1,
      [Define to 1 if you have the freeifaddrs function.])
    ac_cv_func_freeifaddrs="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_freeifaddrs="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_GETADDRINFO
dnl -------------------------------------------------
dnl Verify if getaddrinfo is available, prototyped, can
dnl be compiled and seems to work. If all of these are
dnl true, and usage has not been previously disallowed
dnl with shell variable curl_disallow_getaddrinfo, then
dnl HAVE_GETADDRINFO will be defined.

AC_DEFUN([CURL_CHECK_FUNC_GETADDRINFO], [
  AC_REQUIRE([CURL_INCLUDES_WS2TCPIP])dnl
  AC_REQUIRE([CURL_INCLUDES_STDLIB])dnl
  AC_REQUIRE([CURL_INCLUDES_STRING])dnl
  AC_REQUIRE([CURL_INCLUDES_SYS_SOCKET])dnl
  AC_REQUIRE([CURL_INCLUDES_NETDB])dnl
  #
  tst_links_getaddrinfo="unknown"
  tst_proto_getaddrinfo="unknown"
  tst_compi_getaddrinfo="unknown"
  tst_works_getaddrinfo="unknown"
  tst_allow_getaddrinfo="unknown"
  #
  AC_MSG_CHECKING([if getaddrinfo can be linked])
  AC_LINK_IFELSE([
    AC_LANG_PROGRAM([[
      $curl_includes_ws2tcpip
      $curl_includes_sys_socket
      $curl_includes_netdb
    ]],[[
      if(0 != getaddrinfo(0, 0, 0, 0))
        return 1;
    ]])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_getaddrinfo="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_getaddrinfo="no"
  ])
  #
  if test "$tst_links_getaddrinfo" = "yes"; then
    AC_MSG_CHECKING([if getaddrinfo is prototyped])
    AC_EGREP_CPP([getaddrinfo],[
      $curl_includes_ws2tcpip
      $curl_includes_sys_socket
      $curl_includes_netdb
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_getaddrinfo="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_getaddrinfo="no"
    ])
  fi
  #
  if test "$tst_proto_getaddrinfo" = "yes"; then
    AC_MSG_CHECKING([if getaddrinfo is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_ws2tcpip
        $curl_includes_sys_socket
        $curl_includes_netdb
      ]],[[
        if(0 != getaddrinfo(0, 0, 0, 0))
          return 1;
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_getaddrinfo="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_getaddrinfo="no"
    ])
  fi
  #
  dnl only do runtime verification when not cross-compiling
  if test "x$cross_compiling" != "xyes" &&
    test "$tst_compi_getaddrinfo" = "yes"; then
    AC_MSG_CHECKING([if getaddrinfo seems to work])
    AC_RUN_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_ws2tcpip
        $curl_includes_stdlib
        $curl_includes_string
        $curl_includes_sys_socket
        $curl_includes_netdb
      ]],[[
        struct addrinfo hints;
        struct addrinfo *ai = 0;
        int error;

        memset(&hints, 0, sizeof(hints));
        hints.ai_flags = AI_NUMERICHOST;
        hints.ai_family = AF_UNSPEC;
        hints.ai_socktype = SOCK_STREAM;
        error = getaddrinfo("127.0.0.1", 0, &hints, &ai);
        if(error || !ai)
          exit(1); /* fail */
        else
          exit(0);
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_works_getaddrinfo="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_works_getaddrinfo="no"
    ])
  fi
  #
  if test "$tst_compi_getaddrinfo" = "yes" &&
    test "$tst_works_getaddrinfo" != "no"; then
    AC_MSG_CHECKING([if getaddrinfo usage allowed])
    if test "x$curl_disallow_getaddrinfo" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_getaddrinfo="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_getaddrinfo="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if getaddrinfo might be used])
  if test "$tst_links_getaddrinfo" = "yes" &&
     test "$tst_proto_getaddrinfo" = "yes" &&
     test "$tst_compi_getaddrinfo" = "yes" &&
     test "$tst_allow_getaddrinfo" = "yes" &&
     test "$tst_works_getaddrinfo" != "no"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_GETADDRINFO, 1,
      [Define to 1 if you have a working getaddrinfo function.])
    ac_cv_func_getaddrinfo="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_getaddrinfo="no"
  fi
])


dnl CURL_CHECK_FUNC_GETHOSTBYADDR
dnl -------------------------------------------------
dnl Verify if gethostbyaddr is available, prototyped,
dnl and can be compiled. If all of these are true,
dnl and usage has not been previously disallowed with
dnl shell variable curl_disallow_gethostbyaddr, then
dnl HAVE_GETHOSTBYADDR will be defined.

AC_DEFUN([CURL_CHECK_FUNC_GETHOSTBYADDR], [
  AC_REQUIRE([CURL_INCLUDES_WINSOCK2])dnl
  AC_REQUIRE([CURL_INCLUDES_NETDB])dnl
  #
  tst_links_gethostbyaddr="unknown"
  tst_proto_gethostbyaddr="unknown"
  tst_compi_gethostbyaddr="unknown"
  tst_allow_gethostbyaddr="unknown"
  #
  AC_MSG_CHECKING([if gethostbyaddr can be linked])
  AC_LINK_IFELSE([
    AC_LANG_PROGRAM([[
      $curl_includes_winsock2
      $curl_includes_netdb
    ]],[[
      if(0 != gethostbyaddr(0, 0, 0))
        return 1;
    ]])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_gethostbyaddr="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_gethostbyaddr="no"
  ])
  #
  if test "$tst_links_gethostbyaddr" = "yes"; then
    AC_MSG_CHECKING([if gethostbyaddr is prototyped])
    AC_EGREP_CPP([gethostbyaddr],[
      $curl_includes_winsock2
      $curl_includes_netdb
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_gethostbyaddr="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_gethostbyaddr="no"
    ])
  fi
  #
  if test "$tst_proto_gethostbyaddr" = "yes"; then
    AC_MSG_CHECKING([if gethostbyaddr is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_winsock2
        $curl_includes_netdb
      ]],[[
        if(0 != gethostbyaddr(0, 0, 0))
          return 1;
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_gethostbyaddr="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_gethostbyaddr="no"
    ])
  fi
  #
  if test "$tst_compi_gethostbyaddr" = "yes"; then
    AC_MSG_CHECKING([if gethostbyaddr usage allowed])
    if test "x$curl_disallow_gethostbyaddr" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_gethostbyaddr="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_gethostbyaddr="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if gethostbyaddr might be used])
  if test "$tst_links_gethostbyaddr" = "yes" &&
     test "$tst_proto_gethostbyaddr" = "yes" &&
     test "$tst_compi_gethostbyaddr" = "yes" &&
     test "$tst_allow_gethostbyaddr" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_GETHOSTBYADDR, 1,
      [Define to 1 if you have the gethostbyaddr function.])
    ac_cv_func_gethostbyaddr="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_gethostbyaddr="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
dnl -------------------------------------------------
dnl Verify if gethostbyname is available, prototyped,
dnl and can be compiled. If all of these are true,
dnl and usage has not been previously disallowed with
dnl shell variable curl_disallow_gethostbyname, then
dnl HAVE_GETHOSTBYNAME will be defined.

AC_DEFUN([CURL_CHECK_FUNC_GETHOSTBYNAME], [
  AC_REQUIRE([CURL_INCLUDES_WINSOCK2])dnl
  AC_REQUIRE([CURL_INCLUDES_NETDB])dnl
  #
  tst_links_gethostbyname="unknown"
  tst_proto_gethostbyname="unknown"
  tst_compi_gethostbyname="unknown"
  tst_allow_gethostbyname="unknown"
  #
  AC_MSG_CHECKING([if gethostbyname can be linked])
  AC_LINK_IFELSE([
    AC_LANG_PROGRAM([[
      $curl_includes_winsock2
      $curl_includes_netdb
    ]],[[
      if(0 != gethostbyname(0))
        return 1;
    ]])
  ],[
    AC_MSG_RESULT([yes])
    tst_links_gethostbyname="yes"
  ],[
    AC_MSG_RESULT([no])
    tst_links_gethostbyname="no"
  ])
  #
  if test "$tst_links_gethostbyname" = "yes"; then
    AC_MSG_CHECKING([if gethostbyname is prototyped])
    AC_EGREP_CPP([gethostbyname],[
      $curl_includes_winsock2
      $curl_includes_netdb
    ],[
      AC_MSG_RESULT([yes])
      tst_proto_gethostbyname="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_proto_gethostbyname="no"
    ])
  fi
  #
  if test "$tst_proto_gethostbyname" = "yes"; then
    AC_MSG_CHECKING([if gethostbyname is compilable])
    AC_COMPILE_IFELSE([
      AC_LANG_PROGRAM([[
        $curl_includes_winsock2
        $curl_includes_netdb
      ]],[[
        if(0 != gethostbyname(0))
          return 1;
      ]])
    ],[
      AC_MSG_RESULT([yes])
      tst_compi_gethostbyname="yes"
    ],[
      AC_MSG_RESULT([no])
      tst_compi_gethostbyname="no"
    ])
  fi
  #
  if test "$tst_compi_gethostbyname" = "yes"; then
    AC_MSG_CHECKING([if gethostbyname usage allowed])
    if test "x$curl_disallow_gethostbyname" != "xyes"; then
      AC_MSG_RESULT([yes])
      tst_allow_gethostbyname="yes"
    else
      AC_MSG_RESULT([no])
      tst_allow_gethostbyname="no"
    fi
  fi
  #
  AC_MSG_CHECKING([if gethostbyname might be used])
  if test "$tst_links_gethostbyname" = "yes" &&
     test "$tst_proto_gethostbyname" = "yes" &&
     test "$tst_compi_gethostbyname" = "yes" &&
     test "$tst_allow_gethostbyname" = "yes"; then
    AC_MSG_RESULT([yes])
    AC_DEFINE_UNQUOTED(HAVE_GETHOSTBYNAME, 1,
      [Define to 1 if you have the gethostbyname function.])
    ac_cv_func_gethostbyname="yes"
  else
    AC_MSG_RESULT([no])
    ac_cv_func_gethostbyname="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], [