From owner-freebsd-hackers  Fri Aug  4  5:52:35 2000
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Date: Fri, 04 Aug 2000 13:52:11 +0100
From: Karl Pielorz <kpielorz@tdx.co.uk>
Organization: The Digital eXchange
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To: Bjoern Fischer <bfischer@Techfak.Uni-Bielefeld.DE>
Cc: hackers@FreeBSD.ORG
Subject: Re: LD_PRELOAD odities / Documentation?
References: <39894897.79E14398@tdx.co.uk> <20000803234951.B267@frolic.no-support.loc>
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Bjoern Fischer wrote:
 
> To wrap libc functions you have to use dlsym() with the special
> handle RTLD_NEXT to get the next incarnation of your function.
> E.g. you want to wrap fchmod(), so write your own fchmod() and
> after you `corrected' the params you may have to call the `real'
> fchmod(). You will get this with dlsym(RTLD_NEXT, "fchmod").

Thanks! - That fixed it... Linux doesn't have such a handle (and seems to work
fine without it)... I hadn't strayed enough through the man page for dlsym to
notice the difference...

Regards,

Karl


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