How to check root powers on a struct proc ?

[Aziz Kezzou]

Hi all,
I am trying to check that a process (struct proc) has root powers when
it calls my KLD system call.
I know from kern_jail.c that I can use suser() but this function takes
a struct thread* instead of struct proc* although the credentials
(struct ucred *p_ucred;) are stored in proc !

Is there an esay way to get a struct thread* from a struct proc* ? or
should I simply use the function:  int suser_cred(struct ucred *cred,
int flag); with cred = p-> p_ucred

BTW what would the value of flag  be?

Thanks,
-aziz