equivalent of adb's $p in DS3100 kernel dbx?

[John T Kohl]

[re-post to c.u.u; I originally posted only to comp.sys.dec]

I'm trying to track down some problems with applications which hang for
a while (30sec-5min) somewhere in the kernel; I suspect it's in the PTY
code.  However, the WCHAN output from ps alx is not very useful.  What
I'd like to do is the equivalent of the $p command to get on a
particular process' stack in ADB on the VAX, but I can't find anything
in dbx which is similar.

This is on a DECstation 3100 running Ultrix 3.1. 

Any hints?
--
John Kohl <jtkohl at ATHENA.MIT.EDU> or <jtkohl at MIT.EDU>
Digital Equipment Corporation/Project Athena
(The above opinions are MINE.  Don't put my words in somebody else's mouth!)