From owner-freebsd-hackers  Fri Sep 26 01:13:09 1997
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Date: Fri, 26 Sep 1997 10:09:43 +0200
From: lada@ws6303.gud.siemens.at (marino.ladavac@siemens.at)
Message-Id: <199709260809.KAA10101@ws6423.gud.siemens.at>
To: hackers@FreeBSD.ORG, joe@via.net
Subject: Re: Truss/Trace?
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> From owner-freebsd-hackers@FreeBSD.ORG Thu Sep 25 21:40:05 MET 1997
> Date: Thu, 25 Sep 1997 12:08:55 -0700
> From: Joe McGuckin <joe@via.net>
> To: hackers@FreeBSD.ORG
> Subject: Truss/Trace?
> X-Loop: FreeBSD.org
> 
> 
> 
> Any anyone implemented this for FreeBSD yet?
> 

man ktrace.  You'll need to rebuild the kernel

/Marino