ax_func_which_gethostbyname_r
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Synopsis
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     AX_FUNC_WHICH_GETHOSTBYNAME_R

Description
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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.

Source Code
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Download the latest version of ax_func_which_gethostbyname_r.m4 (http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=blob_plain;f=m4/ax_func_which_gethostbyname_r.m4) or browse the macro's revision history (http://git.savannah.gnu.org/gitweb/?p=autoconf-archive.git;a=history;f=m4/ax_func_which_gethostbyname_r.m4).

License
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Copyright © 2008 Caolan McNamara caolan@skynet.ie
 Copyright © 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.