From owner-freebsd-chat  Fri Jul  6 15:56:56 2001
Delivered-To: freebsd-chat@freebsd.org
Received: from smtp2.knology.net (user-24-214-63-14.knology.net [24.214.63.14])
	by hub.freebsd.org (Postfix) with SMTP id A387037B405
	for <chat@freebsd.org>; Fri,  6 Jul 2001 15:56:52 -0700 (PDT)
	(envelope-from steve@havk.org)
Received: (qmail 29895 invoked from network); 6 Jul 2001 22:56:52 -0000
Received: from user-24-214-56-224.knology.net (HELO bsd.havk.org) (24.214.56.224)
  by user-24-214-63-14.knology.net with SMTP; 6 Jul 2001 22:56:52 -0000
Received: by bsd.havk.org (Postfix, from userid 1001)
	id A5A2F1A843; Fri,  6 Jul 2001 17:56:25 -0500 (CDT)
Date: Fri, 6 Jul 2001 17:56:25 -0500
From: Steve Price <steve@havk.org>
To: chat@freebsd.org
Subject: gdb debugging tips
Message-ID: <20010706175625.J65832@bsd.havk.org>
Mime-Version: 1.0
Content-Type: text/plain; charset=us-ascii
Content-Disposition: inline
User-Agent: Mutt/1.2.5i
X-Operating-System: FreeBSD 4.3-STABLE i386
Sender: owner-freebsd-chat@FreeBSD.ORG
Precedence: bulk
List-ID: <freebsd-chat.FreeBSD.ORG>
List-Archive: <http://docs.freebsd.org/mail/> (Web Archive)
List-Help: <mailto:majordomo?subject=help> (List Instructions)
List-Subscribe: <mailto:majordomo?subject=subscribe%20freebsd-chat>
List-Unsubscribe: <mailto:majordomo?subject=unsubscribe%20freebsd-chat>
X-Loop: FreeBSD.org

I've been having problems with a software package for which I
only have a binary with no debugging symbols.  In talking to 
the folks that wrote the software I know what arguments the
routine takes I just need to be able to see them in the debugger.
Here's what I've done:

Fire up the program.  Attach to the pid of the running process
with 'gdb lsv 10336'.  I've set the breakpoint at the routine
that I'm interested in 'break LH2P' and I've coerced the program
to run to the breakpoint.

Here's where I'm lost.  I'm back in gdb and it is waiting for
me to tell it what to do.  I know the function LH2P takes one
argument a 'char *'.  How do I view a function's arguments?  With
debugging symbols this is as easy as 'where'.  I figured
'info args' would be the ticket but all it says is 'No symbol
table info avialable'.  Now I'm betting the information from
'info frame' is the key but how to decipher it.

Thanks.

-steve

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