ki_ucred
struct ki_ucred *uc = &eproc->e_ucred;
kauth_cred_toucred(kauth_cred_t cred, struct ki_ucred *uc)
struct ki_ucred;
void kauth_cred_toucred(kauth_cred_t, struct ki_ucred *);
struct ki_ucred e_ucred; /* current credentials */