Subject: truss for Netbsd.
To: None <tech-kern@NetBSD.ORG>
From: Darren Reed <darrenr@cyber.com.au>
List: tech-kern
Date: 03/06/1998 14:16:20
In the last couple of days I've done a bit of hacking on the kernel,
implemented an fktrace(2), and hacked up a truss-like program which
I've called "ktruss" (for now)..

Below is result of that work, 2 diffs (one for the kernel and one
for the krace(2) man page), along with ktruss.  the current version
of ktruss is very much just a hack - I call fktrace(2) using syscall()
as I've not been real keen on building a new libc just to test this
with.  The patches make it syscall 241, and it's called that way from
ktruss.

ktruss is a complete hack still, and is currently just a merge of
kdump/ktrace.  I plan on hacking it some more to allow some of the
features found on Solaris such as selection of system calls, signals,
etc.  Because ktruss still works with ktrace records, it can read
files written by ktrace (i.e. alternative output to kdump's) as well
as generate files readable by kdump.  ktruss does decode the ktrace
records differently to kdump...more like what you'd see elsehere :)

Amongst the many different things the patches change, is ktrsetemul()
calling.  For some bizarre reason, 'emul' is used as a "marker" record
by ktrace.  if you've ever looked at kern_ktrace.c, you'll notice a lot of
"struct proc *p = curproc;' assignments.  However, when ktrace'ing another
process via -p, the first marker call is made for the 'wrong process'.
I'm not sure if I've made the right changes, but it does at least
avoid a panic now.

Darren

p.s. If the name ktruss is hard to swallow, calling it truss is fine.
it doesn't really make any difference to me.

p.p.s. this tgz is built from /usr/src/usr.bin and I tested and made
patches using 1.2G.

begin 600 ktruss.tgz
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