From owner-freebsd-hackers  Fri Mar 10 14:47:34 2000
Delivered-To: freebsd-hackers@freebsd.org
Received: from voyager.fisicc-ufm.edu (ip-198-202.guate.net [209.198.197.202])
	by hub.freebsd.org (Postfix) with ESMTP
	id B509437B8F2; Fri, 10 Mar 2000 14:47:19 -0800 (PST)
	(envelope-from obonilla@voyager.fisicc-ufm.edu)
Received: (from obonilla@localhost)
	by voyager.fisicc-ufm.edu (8.9.3/8.9.3) id QAA93449;
	Fri, 10 Mar 2000 16:44:28 -0600 (CST)
	(envelope-from obonilla)
Date: Fri, 10 Mar 2000 16:44:28 -0600
From: Oscar Bonilla <obonilla@fisicc-ufm.edu>
To: Kris Kennaway <kris@hub.freebsd.org>
Cc: Alfred Perlstein <bright@wintelcom.net>,
	Oscar Bonilla <obonilla@fisicc-ufm.edu>, freebsd-hackers@FreeBSD.ORG
Subject: Re: inner workings of the C compiler
Message-ID: <20000310164428.A89006@fisicc-ufm.edu>
References: <20000308163057.W14279@fw.wintelcom.net> <Pine.BSF.4.21.0003091719340.82270-100000@hub.freebsd.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
X-Mailer: Mutt 1.0pre1i
In-Reply-To: <Pine.BSF.4.21.0003091719340.82270-100000@hub.freebsd.org>
Sender: owner-freebsd-hackers@FreeBSD.ORG
Precedence: bulk
X-Loop: FreeBSD.ORG

On Thu, Mar 09, 2000 at 05:20:31PM -0800, Kris Kennaway wrote:
> On Wed, 8 Mar 2000, Alfred Perlstein wrote:
> 
> > I'm pretty sure this can be done a hell of a lot easier by using shared
> > libraries and using the enviornment variables LD_LIBRARY_PATH and
> > LD_PRELOAD, see the rtld manpage for more help.
> 
> Yes, I've done this when trying to track down buffer overflows in
> libc..stick them in their own directory and use LD_LIBRARY_PATH, which
> tells the dynamic linker where to search.
> 

$ echo $LD_LIBRARY_PATH/
/home/obonilla/freebsd/nss/libc/
$ echo $LD_PRELOAD 
/home/obonilla/freebsd/nss/libc/libc.so.4
$ make
cc -g -DYP -DFreeBSD -Wall -pedantic -ansi -o nss-test -I../../libc/include nss-test.c
/tmp/ccy93427.o: In function `main':
/home/obonilla/freebsd/nss/tests/libc/nss-test.c(.text+0xb0): undefined reference to `nsdispatch'
*** Error code 1

Stop in /usr/home/obonilla/freebsd/nss/tests/libc.
$ 

at this point I switch makefiles to use static building and...

$ make
cc -g -DYP -DFreeBSD -Wall -pedantic -ansi -c -I../../libc/include nss-test.c
cc -g -nostdlib -static -L../../libc -o nss-test nss-test.o ../../csu/i386-elf/crt1.o ../../csu/i386-elf/crti.o -lc
$ 

but when I run the binary...

$ ./nss-test 
files called
files called
retval = 1
NS_SUCCESS
Bus error (core dumped)
$ 

am I doing something wrong?

BTW... I've ported the Name Service Switch from NetBSD to FreeBSD and it's
working on my laptop right now. However, I need some help moving all the
get*by* functions in the C library to use the new nsdispatch function,
especially for the NIS code... who should I talk to... anyone interested on
seeing some patches?

regards,

-oscar

-- 
pgp public key: finger obonilla@fisicc-ufm.edu
pgp fingerprint: 6D 18 8C 90 4C DF F0 4B  DF 35 1F 69 A1 33 C7 BC


To Unsubscribe: send mail to majordomo@FreeBSD.org
with "unsubscribe freebsd-hackers" in the body of the message