view doc/inet_ntoa.texi @ 17321:896204e6fbfc

extensions: port better to MINUX 3, HP-UX, autoheader 2.62 Some of these changes are merged in from git Autoconf. * m4/extensions.m4 (AC_USE_SYSTEM_EXTENSIONS): When deciding whether to define _XOPEN_SOURCE, inspect the preprocessor macro __hpux instead of the more-heavyweight operation of requiring AC_CANONICAL_HOST. Define _NETBSD_HOST on MINUX, for MINUX 3. Use USE_SYSTEM_EXTENSIONS, not __EXTENSIONS__, as the key for __EXTENSIONS__.
author Paul Eggert <>
date Wed, 06 Feb 2013 22:41:08 -0800
parents e542fd46ad6f
line wrap: on
line source

@node inet_ntoa
@section inet_ntoa
@findex inet_ntoa

@c Copyright (C) 2005, 2009-2013 Free Software Foundation, Inc.

@c Permission is granted to copy, distribute and/or modify this document
@c under the terms of the GNU Free Documentation License, Version 1.3 or
@c any later version published by the Free Software Foundation; with no
@c Invariant Sections, with no Front-Cover Texts, and with no Back-Cover
@c Texts.  A copy of the license is included in the ``GNU Free
@c Documentation License'' file as part of this distribution.

The @code{inet_ntoa} function need not be reentrant, and consequently
is not required to be thread safe.  Implementations of
@code{inet_ntoa} typically write the time stamp into static buffer.
If two threads call @code{inet_ntoa} at roughly the same time, you
might end up with the wrong date in one of the threads, or some
undefined string.  Further, @code{inet_ntoa} is specific for
IPv4 addresses.

A protocol independent function is @code{inet_ntop}.