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# ==================================================================================
# https://www.gnu.org/software/autoconf-archive/ax_func_which_gethostbyname_r.html
# ==================================================================================
#
# SYNOPSIS
#
# AX_FUNC_WHICH_GETHOSTBYNAME_R
#
# DESCRIPTION
#
# Determines which historical variant of the gethostbyname_r() call
# (taking three, five, or six arguments) is available on the system and
# defines one of the following macros accordingly:
#
# HAVE_FUNC_GETHOSTBYNAME_R_6
# HAVE_FUNC_GETHOSTBYNAME_R_5
# HAVE_FUNC_GETHOSTBYNAME_R_3
#
# as well as
#
# HAVE_GETHOSTBYNAME_R
#
# If used in conjunction with gethostname.c, the API demonstrated in
# test.c can be used regardless of which gethostbyname_r() is available.
# These example files can be found at
# http://www.csn.ul.ie/~caolan/publink/gethostbyname_r
#
# based on David Arnold's autoconf suggestion in the threads faq
#
# Originally named "AC_caolan_FUNC_WHICH_GETHOSTBYNAME_R". Rewritten for
# Autoconf 2.5x, and updated for 2.68 by Daniel Richard G.
#
# LICENSE
#
# Copyright (c) 2008 Caolan McNamara <caolan@skynet.ie>
# Copyright (c) 2008 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, see <https://www.gnu.org/licenses/>.
#
# 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 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.
#serial 8
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|five|six)
AC_DEFINE([HAVE_GETHOSTBYNAME_R], [1],
[Define to 1 if you have some form of gethostbyname_r().])
;;
esac
case "$ac_cv_func_which_gethostbyname_r" in
three)
AC_MSG_RESULT([three])
AC_DEFINE([HAVE_FUNC_GETHOSTBYNAME_R_3], [1],
[Define to 1 if you have the three-argument form of gethostbyname_r().])
;;
five)
AC_MSG_RESULT([five])
AC_DEFINE([HAVE_FUNC_GETHOSTBYNAME_R_5], [1],
[Define to 1 if you have the five-argument form of gethostbyname_r().])
;;
six)
AC_MSG_RESULT([six])
AC_DEFINE([HAVE_FUNC_GETHOSTBYNAME_R_6], [1],
[Define to 1 if you have the six-argument form of 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
]) dnl end AC_DEFUN
|
