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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:


as well as


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

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

Download the latest version of ax_func_which_gethostbyname_r.m4 or browse the macro’s revision history.


Copyright © 2008 Caolan McNamara
Copyright © 2008 Daniel Richard G.

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.

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