I will try the user pf parameter "user { -tor }". as yes, the tor server is running as _tor.

......

Last news: It works!

......
Thank you "Jason Crawford" , "Chris Kuethe", "Matthew Dempsky" for your tips!
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On Tue, 27 May 2008 13:58:27 -0400

"Jason Crawford"  wrote:
> On Tue, May 27, 2008 at 1:46 PM, macintoshzoom

quoted text
>  wrote:

> > I want to allow out network connections only from a specific local proxy server (tor).

> >

> > How do I set up my pf.conf for this?

> > How can I syntax pf.conf by pid?

> >

>

> The easiest method for this, I think, would be the 'user' parameter,

> since the tor package for OpenBSD has the server run as the _tor user.