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# m4/ax_func_which_gethostbyname_r.m4

# Copyright © 2005 Caolan McNamara <caolan@skynet.ie>

# Copyright © 2005 Daniel Richard G. <skunk@iskunk.org>

# This program is free software; you can redistribute it 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.

# This program 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

# General Public License for more details.

# You should have received a copy of the GNU General Public License

# along with this program; if not, write to the Free Software

# Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA

# 02111-1307, USA.

# As a special exception, the respective Autoconf Macro's copyright

# owner gives unlimited permission to copy, distribute and modify the

# configure scripts that are the output of Autoconf when processing

# the Macro. You need not follow the terms of the GNU General Public

# License when using or distributing such scripts, even though

# portions of the text of the Macro appear in them. The GNU General

# Public License (GPL) does govern all other use of the material that

# constitutes the Autoconf Macro.

# This special exception to the GPL applies to versions of the

# Autoconf Macro released by the Autoconf Macro Archive. When you make

# and distribute a modified version of the Autoconf Macro, you may

# extend this special exception to the GPL to apply to your modified

# version as well.

AC_DEFUN([AX_FUNC_WHICH_GETHOSTBYNAME_R], [

    AC_LANG_PUSH(C)

    AC_MSG_CHECKING([how many arguments gethostbyname_r() takes])

    AC_CACHE_VAL(ac_cv_func_which_gethostbyname_r, [

################################################################

ac_cv_func_which_gethostbyname_r=unknown

#

# ONE ARGUMENT (sanity check)

#

# This should fail, as there is no variant of gethostbyname_r() that takes

# a single argument. If it actually compiles, then we can assume that

# netdb.h is not declaring the function, and the compiler is thereby

# assuming an implicit prototype. In which case, we're out of luck.

#

AC_COMPILE_IFELSE(

    AC_LANG_PROGRAM(

        [[#include <netdb.h>]],

        [[

            char *name = "www.gnu.org";

            (void)gethostbyname_r(name) /* ; */

        ]]),

    ac_cv_func_which_gethostbyname_r=no)

#

# SIX ARGUMENTS

# (e.g. Linux)

#

if test "$ac_cv_func_which_gethostbyname_r" = "unknown"; then

AC_COMPILE_IFELSE(

    AC_LANG_PROGRAM(

        [[#include <netdb.h>]],

        [[

            char *name = "www.gnu.org";

            struct hostent ret, *retp;

            char buf@<:@1024@:>@;

            int buflen = 1024;

            int my_h_errno;

            (void)gethostbyname_r(name, &ret, buf, buflen, &retp, &my_h_errno) /* ; */

        ]]),

    ac_cv_func_which_gethostbyname_r=six)

fi

#

# FIVE ARGUMENTS

# (e.g. Solaris)

#

if test "$ac_cv_func_which_gethostbyname_r" = "unknown"; then

AC_COMPILE_IFELSE(

    AC_LANG_PROGRAM(

        [[#include <netdb.h>]],

        [[

            char *name = "www.gnu.org";

            struct hostent ret;

            char buf@<:@1024@:>@;

            int buflen = 1024;

            int my_h_errno;

            (void)gethostbyname_r(name, &ret, buf, buflen, &my_h_errno) /* ; */

        ]]),

    ac_cv_func_which_gethostbyname_r=five)

fi

#

# THREE ARGUMENTS

# (e.g. AIX, HP-UX, Tru64)

#

if test "$ac_cv_func_which_gethostbyname_r" = "unknown"; then

AC_COMPILE_IFELSE(

    AC_LANG_PROGRAM(

        [[#include <netdb.h>]],

        [[

            char *name = "www.gnu.org";

            struct hostent ret;

            struct hostent_data data;

            (void)gethostbyname_r(name, &ret, &data) /* ; */

        ]]),

    ac_cv_func_which_gethostbyname_r=three)

fi

################################################################

]) dnl end AC_CACHE_VAL

case "$ac_cv_func_which_gethostbyname_r" in

    three)

    AC_MSG_RESULT([three])

    AC_DEFINE([HAVE_FUNC_GETHOSTBYNAME_R_3], 1, [three-argument gethostbyname_r])

    ;;

    five)

    AC_MSG_RESULT([five])

    AC_DEFINE([HAVE_FUNC_GETHOSTBYNAME_R_5], 1, [five-argument gethostbyname_r])

    ;;

    six)

    AC_MSG_RESULT([six])

    AC_DEFINE([HAVE_FUNC_GETHOSTBYNAME_R_6], 1, [six-argument gethostbyname_r])

    ;;

    no)

    AC_MSG_RESULT([cannot find function declaration in netdb.h])

    ;;

    unknown)

    AC_MSG_RESULT([can't tell])

    ;;

    *)

    AC_MSG_ERROR([internal error])

    ;;

esac

AC_LANG_POP(C)

]) dnl end AC_DEFUN