pam_loginuid.so question

[Zachary Shay <zachary shay gmail com>]

I understand that this module is used to set the uid of a session.  The 
man page for pam_loginuid.so has led me to believe...when a user logs 
onto a system utilizing this module, everything in the session will have 
that user's uid tag'd in the auid field.  What syscall should I look for 
while creating an audit rule to track session creation?  A few google 
searches have shown a setauid syscall for bsd and sysV, but my personal 
copy of syscall.h only shows a setuid syscall.

Thanks in advance,
Zach