# ================================================================================= # http://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 <http://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 7 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