Function domainset_shadow

freebsd/kern/kern_cpuset.c:608–628

* Create a new set that is a subset of a parent. */

 * Create a new set that is a subset of a parent.
 */
static struct domainset *
domainset_shadow(const struct domainset *pdomain,
    const struct domainset *domain, struct domainlist *freelist)
{
	struct domainset *ndomain;

	ndomain = LIST_FIRST(freelist);
	LIST_REMOVE(ndomain, ds_link);

	/*
	 * Initialize the key from the request.
	 */
	domainset_copy(domain, ndomain);

	/*
	 * Restrict the key by the parent.
	 */
	DOMAINSET_AND(&ndomain->ds_mask, &pdomain->ds_mask);

	return _domainset_create(ndomain, freelist);
}

/*
 * Recursively check for errors that would occur from applying mask to