truss a os process

$>ps -ef| grep 16069| grep -v grep
oracle 16069 1 0 14:07:17 ? 0:00 ora_d000_mtrx

$>truss -o a.log -p 16069

$>cat a.log
poll(0x106785F40, 2, 60000) (sleeping...)

few other tools that helps
ps
prstat
pstatck -

for linux - strace
tru64 trace