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Re: weak symbols and glibc versioning

From: Mike Frysinger <vapier at gentoo dot org>
To: libc-help at sourceware dot org
Cc: "Ángel González" <keisial at gmail dot com>
Date: Wed, 6 Jan 2010 13:56:09 -0500
Subject: Re: weak symbols and glibc versioning
References: <4B44AA62.90407@gmail.com>

On Wednesday 06 January 2010 10:21:06 Ángel González wrote:
> I have a program for which I'd like to use "new" glibc features like
> accept4.
> Now, this program must work with an old glibc which doesn't provide
> those functions.

use a function pointer and during init, call dlopen() to search for the accept 
symbol in glibc.  if it isnt found, assign the function pointer to your local 
symbol.
-mike

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References:
- weak symbols and glibc versioning
  - From: Ángel González

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