From owner-freebsd-hackers  Fri Jun  8 10:23:50 2001
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Date: Fri, 8 Jun 2001 13:23:21 -0400
From: Alfred Perlstein <bright@rush.net>
To: Kevin Day <toasty@temphost.dragondata.com>
Cc: Dan Nelson <dnelson@emsphone.com>, hackers@FreeBSD.ORG
Subject: Re: Access to symbol table(including dynamics) at runtime
Message-ID: <20010608132320.F1832@superconductor.rush.net>
References: <20010608121616.A23647@dan.emsphone.com> <200106081720.MAA43236@temphost.dragondata.com>
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* Kevin Day <toasty@temphost.dragondata.com> [010608 13:21] wrote:
> > 
> > In the last episode (Jun 08), Kevin Day said:
> > > Is there a simple way that I can lookup a symbol name(by address)
> > > during runtime?
> > > 
> > > I know I can exec nm, look up for the address I need, and get local
> > > symbols, but it would be really nice if I could get addresses of
> > > functions in dynamic libraries as well. I know I could use ldd to get
> > > offsets of each .so and calculate from there, but I'm starting to
> > > think I'm reproducing work that was done somewhere else.
> > > 
> > > If someone could point me at a man page to something that can do what
> > > I need, tell me of a library that does something similar, or tell me
> > > why this can't be done, i'd be very thankful. :)
> > 
> > Would dladdr() do what you want?
> 
> 
> AHH! YES!
> 
> I'll buy a beer to the first person who adds dladdr(3) to the SEE ALSO
> section of dlopen's man page.

If you want to be able to see symbols in your main executable you
_may_ need to also compile it with -export-dynamic or something
like that.

-- 
-Alfred Perlstein [alfred@freebsd.org]
Instead of asking why a piece of software is using "1970s technology,"
start asking why software is ignoring 30 years of accumulated wisdom.

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