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| 1 | +# m4/ax_func_which_gethostbyname_r.m4 |
| 2 | + |
| 3 | +# Copyright © 2005 Caolan McNamara <[email protected]> |
| 4 | +# Copyright © 2005 Daniel Richard G. <[email protected]> |
| 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 |
| 28 | +# constitutes the Autoconf Macro. |
| 29 | + |
| 30 | +# This special exception to the GPL applies to versions of the |
| 31 | +# Autoconf Macro released by the Autoconf Macro Archive. When you make |
| 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 |
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