1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
|
# 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
|
