Why I can't trace linux process's childs with truss?

[Jilles Tjoelker]

On Fri, Sep 10, 2010 at 12:07:05PM -0700, Yuri wrote:
> I am trying to get the log of all system calls that skype makes with 
> truss -f /usr/local/share/skype/skype
> For some reason the resulting log only has the leading process calls and 
> nothing from it's 8 childs.
> Truss doesn't show any 'cloned' processes. Is this a bug in truss that 
> it doesn't follow 'cloned' processes?

> Is there any workaround or other way I can debug skype? strace doesn't 
> work on amd64.
> I am primarily interested why it can't read /dev/video0 device, created 
> by webcamd.

Try using ktrace instead of truss. You will need devel/linux_kdump from
ports to decode the resulting ktrace.out.

Alternatively, if you're familiar with dtrace, you could try that.

-- 
Jilles Tjoelker