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

[Yuri]

On 09/10/2010 16:55, Alexander Kabaev wrote:
> You are. ptrace is supported by linuxulator for a while now. The
> originator problem is likely because he is trying truss, which is not
> Linux-aware. ktrace/linux_kdump combo should work.
>    

I tried this: ktrace -d /usr/local/share/skype/skype
Resulting trace again shows only the main process, not it's descendants, 
despite -d flag.
Same in the case of calling with pid: ktrace -d -p <pid>.

Yuri