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<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01//EN"
"http://www.w3.org/TR/html4/strict.dtd">
<html lang="en">
<head>
<title>
Autoconf Macro: ax_func_which_gethostbyname_r
</title>
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"http://autoconf-archive.cryp.to/ax_func_which_gethostbyname_r.m4">Download
M4 Source</a>
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<hr>
<h1>
ax_func_which_gethostbyname_r
</h1>
<h2>
Synopsis
</h2>
<p class="indent" style="white-space:nowrap;">
<code>AX_FUNC_WHICH_GETHOSTBYNAME_R</code>
</p>
<h2>
Description
</h2>
<div class="indent">
<p>
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:
</p>
<pre>
HAVE_FUNC_GETHOSTBYNAME_R_6
HAVE_FUNC_GETHOSTBYNAME_R_5
HAVE_FUNC_GETHOSTBYNAME_R_3
</pre>
<p>
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
</p>
<p>
based on David Arnold's autoconf suggestion in the threads faq
</p>
<p>
Originally named "AC_caolan_FUNC_WHICH_GETHOSTBYNAME_R". Rewritten for
Autoconf 2.5x by Daniel Richard G.
</p>
</div>
<h2>
Author
</h2>
<p class="indent">
Caolan McNamara <caolan@skynet.ie>, Daniel Richard G.
<skunk@iskunk.org>
</p>
<h2>
Last Modified
</h2>
<p class="indent">
2005-01-21
</p>
<h2>
M4 Source Code
</h2>
<div class="indent">
<pre class="m4source">
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)
;;
five)
AC_MSG_RESULT([five])
AC_DEFINE(HAVE_FUNC_GETHOSTBYNAME_R_5)
;;
six)
AC_MSG_RESULT([six])
AC_DEFINE(HAVE_FUNC_GETHOSTBYNAME_R_6)
;;
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
</pre>
</div>
</body>
</html>
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