Function rctl_proc_fork

freebsd/kern/kern_rctl.c:2109–2160

* Assign RCTL rules to the newly created process. */

 * Assign RCTL rules to the newly created process.
 */
int
rctl_proc_fork(struct proc *parent, struct proc *child)
{
	struct rctl_rule *rule;
	struct rctl_rule_link *link;
	int error;

	ASSERT_RACCT_ENABLED();
	RACCT_LOCK_ASSERT();
	KASSERT(parent->p_racct != NULL, ("process without racct; p = %p", parent));

	LIST_INIT(&child->p_racct->r_rule_links);

	/*
	 * Go through limits applicable to the parent and assign them
	 * to the child.  Rules with 'process' subject have to be duplicated
	 * in order to make their rr_subject point to the new process.
	 */
	LIST_FOREACH(link, &parent->p_racct->r_rule_links, rrl_next) {
		if (link->rrl_rule->rr_subject_type ==
		    RCTL_SUBJECT_TYPE_PROCESS) {
			rule = rctl_rule_duplicate(link->rrl_rule, M_NOWAIT);
			if (rule == NULL)
				goto fail;
			KASSERT(rule->rr_subject.rs_proc == parent,
			    ("rule->rr_subject.rs_proc != parent"));
			rule->rr_subject.rs_proc = child;
			error = rctl_racct_add_rule_locked(child->p_racct,
			    rule);
			rctl_rule_release(rule);
			if (error != 0)
				goto fail;
		} else {
			error = rctl_racct_add_rule_locked(child->p_racct,
			    link->rrl_rule);
			if (error != 0)
				goto fail;
		}
	}

	return (0);

fail:
	while (!LIST_EMPTY(&child->p_racct->r_rule_links)) {
		link = LIST_FIRST(&child->p_racct->r_rule_links);
		LIST_REMOVE(link, rrl_next);
		rctl_rule_release(link->rrl_rule);
		uma_zfree(rctl_rule_link_zone, link);
	}

	return (EAGAIN);
}

/*
 * Release rules attached to the racct.