pr_kill
error = pr_kill(pnp, (int)argp->sig, cr);
error = pr_kill(pnp, (int)argp->sig, cr);
extern int pr_kill(prnode_t *, int, cred_t *);
error = pr_kill(pnp, un32.signo, cr);
error = pr_kill(pnp, sig, cr);