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Diffstat (limited to 'build/ax_func_which_gethostbyname_r.m4')
| -rw-r--r-- | build/ax_func_which_gethostbyname_r.m4 | 196 |
1 files changed, 196 insertions, 0 deletions
diff --git a/build/ax_func_which_gethostbyname_r.m4 b/build/ax_func_which_gethostbyname_r.m4 new file mode 100644 index 0000000000..bb6bc959e7 --- /dev/null +++ b/build/ax_func_which_gethostbyname_r.m4 @@ -0,0 +1,196 @@ +# ================================================================================== +# https://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 <https://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 8 + +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 |