libjava/classpath/m4/ax_func_which_gethostbyname_r.m4

   1 # m4/ax_func_which_gethostbyname_r.m4
   2
   3 # Copyright © 2005 Caolan McNamara <caolan@skynet.ie>
   4 # Copyright © 2005 Daniel Richard G. <skunk@iskunk.org>
   5
   6 # This program is free software; you can redistribute it and/or modify
   7 # it under the terms of the GNU General Public License as published by
   8 # the Free Software Foundation; either version 2 of the License, or
   9 # (at your option) any later version.
  10
  11 # This program is distributed in the hope that it will be useful, but
  12 # WITHOUT ANY WARRANTY; without even the implied warranty of
  13 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
  14 # General Public License for more details.
  15
  16 # You should have received a copy of the GNU General Public License
  17 # along with this program; if not, write to the Free Software
  18 # Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
  19 # 02111-1307, USA.
  20
  21 # As a special exception, the respective Autoconf Macro's copyright
  22 # owner gives unlimited permission to copy, distribute and modify the
  23 # configure scripts that are the output of Autoconf when processing
  24 # the Macro. You need not follow the terms of the GNU General Public
  25 # License when using or distributing such scripts, even though
  26 # portions of the text of the Macro appear in them. The GNU General
  27 # Public License (GPL) does govern all other use of the material that
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  29
  30 # This special exception to the GPL applies to versions of the
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  32 # and distribute a modified version of the Autoconf Macro, you may
  33 # extend this special exception to the GPL to apply to your modified
  34 # version as well.
  35
  36
  37 AC_DEFUN([AX_FUNC_WHICH_GETHOSTBYNAME_R], [
  38
  39     AC_LANG_PUSH(C)
  40     AC_MSG_CHECKING([how many arguments gethostbyname_r() takes])
  41
  42     AC_CACHE_VAL(ac_cv_func_which_gethostbyname_r, [
  43
  44 ################################################################
  45
  46 ac_cv_func_which_gethostbyname_r=unknown
  47
  48 #
  49 # ONE ARGUMENT (sanity check)
  50 #
  51
  52 # This should fail, as there is no variant of gethostbyname_r() that takes
  53 # a single argument. If it actually compiles, then we can assume that
  54 # netdb.h is not declaring the function, and the compiler is thereby
  55 # assuming an implicit prototype. In which case, we're out of luck.
  56 #
  57 AC_COMPILE_IFELSE(
  58     AC_LANG_PROGRAM(
  59         [[#include <netdb.h>]],
  60         [[
  61             char *name = "www.gnu.org";
  62             (void)gethostbyname_r(name) /* ; */
  63         ]]),
  64     ac_cv_func_which_gethostbyname_r=no)
  65
  66 #
  67 # SIX ARGUMENTS
  68 # (e.g. Linux)
  69 #
  70
  71 if test "$ac_cv_func_which_gethostbyname_r" = "unknown"; then
  72
  73 AC_COMPILE_IFELSE(
  74     AC_LANG_PROGRAM(
  75         [[#include <netdb.h>]],
  76         [[
  77             char *name = "www.gnu.org";
  78             struct hostent ret, *retp;
  79             char buf@<:@1024@:>@;
  80             int buflen = 1024;
  81             int my_h_errno;
  82             (void)gethostbyname_r(name, &ret, buf, buflen, &retp, &my_h_errno) /* ; */
  83         ]]),
  84     ac_cv_func_which_gethostbyname_r=six)
  85
  86 fi
  87
  88 #
  89 # FIVE ARGUMENTS
  90 # (e.g. Solaris)
  91 #
  92
  93 if test "$ac_cv_func_which_gethostbyname_r" = "unknown"; then
  94
  95 AC_COMPILE_IFELSE(
  96     AC_LANG_PROGRAM(
  97         [[#include <netdb.h>]],
  98         [[
  99             char *name = "www.gnu.org";
 100             struct hostent ret;
 101             char buf@<:@1024@:>@;
 102             int buflen = 1024;
 103             int my_h_errno;
 104             (void)gethostbyname_r(name, &ret, buf, buflen, &my_h_errno) /* ; */
 105         ]]),
 106     ac_cv_func_which_gethostbyname_r=five)
 107
 108 fi
 109
 110 #
 111 # THREE ARGUMENTS
 112 # (e.g. AIX, HP-UX, Tru64)
 113 #
 114
 115 if test "$ac_cv_func_which_gethostbyname_r" = "unknown"; then
 116
 117 AC_COMPILE_IFELSE(
 118     AC_LANG_PROGRAM(
 119         [[#include <netdb.h>]],
 120         [[
 121             char *name = "www.gnu.org";
 122             struct hostent ret;
 123             struct hostent_data data;
 124             (void)gethostbyname_r(name, &ret, &data) /* ; */
 125         ]]),
 126     ac_cv_func_which_gethostbyname_r=three)
 127
 128 fi
 129
 130 ################################################################
 131
 132 ]) dnl end AC_CACHE_VAL
 133
 134 case "$ac_cv_func_which_gethostbyname_r" in
 135     three)
 136     AC_MSG_RESULT([three])
 137     AC_DEFINE([HAVE_FUNC_GETHOSTBYNAME_R_3], 1, [three-argument gethostbyname_r])
 138     ;;
 139
 140     five)
 141     AC_MSG_RESULT([five])
 142     AC_DEFINE([HAVE_FUNC_GETHOSTBYNAME_R_5], 1, [five-argument gethostbyname_r])
 143     ;;
 144
 145     six)
 146     AC_MSG_RESULT([six])
 147     AC_DEFINE([HAVE_FUNC_GETHOSTBYNAME_R_6], 1, [six-argument gethostbyname_r])
 148     ;;
 149
 150     no)
 151     AC_MSG_RESULT([cannot find function declaration in netdb.h])
 152     ;;
 153
 154     unknown)
 155     AC_MSG_RESULT([can't tell])
 156     ;;
 157
 158     *)
 159     AC_MSG_ERROR([internal error])
 160     ;;
 161 esac
 162
 163 AC_LANG_POP(C)
 164
 165 ]) dnl end AC_DEFUN