Function prison_check

freebsd/kern/kern_jail.c:3036–3042

* Return 0 if jails permit p1 to frob p2, otherwise ESRCH. */

 * Return 0 if jails permit p1 to frob p2, otherwise ESRCH.
 */
int
prison_check(struct ucred *cred1, struct ucred *cred2)
{

	return ((cred1->cr_prison == cred2->cr_prison ||
	    prison_ischild(cred1->cr_prison, cred2->cr_prison)) ? 0 : ESRCH);
}

/*
 * Return 1 if p2 is a child of p1, otherwise 0.