Function sem_prison_cansee

freebsd/kern/sysv_sem.c:612–621

}

static int
sem_prison_cansee(struct prison *rpr, struct semid_kernel *semakptr)
{

	if (semakptr->cred == NULL ||
	    !(rpr == semakptr->cred->cr_prison ||
	      prison_ischild(rpr, semakptr->cred->cr_prison)))
		return (EINVAL);
	return (0);
}

/*
 * Note that the user-mode half of this passes a union, not a pointer.