c coupling mislay users management "ps"

i have doubt maybe someone here assistance me. i "ps aux --sort user" linux console i have list users processes runing machine. doubt i mislay users name imitation list in c program:

for example:

()
--------------------------------------------------------------------------
user: apache
--------------------------------------------------------------------------
3169 0.0 1.2 39752 12352 ? s 04:10 0:00 /usr/sbin/httpd
--------------------------------------------------------------------------
user: vasco
--------------------------------------------------------------------------
23030 0.0 0.1 4648 1536 pts/1 ss 20:02 0:00 bash

()

i imitation user name following i imitation processes... any ideas ?

thx