sugimoto@sums.shiga-med.ac.jp wrote:

> I never use NIS. When I check su with ktrace command,
> 
>    182 su       CALL  open(0x2184c140,0,0)
 :

I'll bet that your su does not have the setuid bit.
I guess we cannot ktrace set[ug]id'ed commands.

> But I wonder why I could use shared libraries without this on the 1.3I
> distribution.

Because they were built with proper options.
The FAQ page also mentions about this, doesn't it?

See SharedLibraryLoadFlags in xsrc/xc/config/cf/bsdLibs.rules.
---
Izumi Tsutsui
tsutsui@ceres.dti.ne.jp