Function sysctl_root_handler_locked

freebsd/kern/kern_sysctl.c:163–203

}

static int
sysctl_root_handler_locked(struct sysctl_oid *oid, void *arg1, intmax_t arg2,
    struct sysctl_req *req, struct rm_priotracker *tracker)
{
	int error;

	if (oid->oid_kind & CTLFLAG_DYN)
		atomic_add_int(&oid->oid_running, 1);

	if (tracker != NULL)
		SYSCTL_RUNLOCK(tracker);
	else
		SYSCTL_WUNLOCK();

	/*
	 * Treat set CTLFLAG_NEEDGIANT and unset CTLFLAG_MPSAFE flags the same,
	 * untill we're ready to remove all traces of Giant from sysctl(9).
	 */
	if ((oid->oid_kind & CTLFLAG_NEEDGIANT) ||
	    (!(oid->oid_kind & CTLFLAG_MPSAFE)))
		mtx_lock(&Giant);
	error = oid->oid_handler(oid, arg1, arg2, req);
	if ((oid->oid_kind & CTLFLAG_NEEDGIANT) ||
	    (!(oid->oid_kind & CTLFLAG_MPSAFE)))
		mtx_unlock(&Giant);

	KFAIL_POINT_ERROR(_debug_fail_point, sysctl_running, error);

	if (tracker != NULL)
		SYSCTL_RLOCK(tracker);
	else
		SYSCTL_WLOCK();

	if (oid->oid_kind & CTLFLAG_DYN) {
		if (atomic_fetchadd_int(&oid->oid_running, -1) == 1 &&
		    (oid->oid_kind & CTLFLAG_DYING) != 0)
			wakeup(&oid->oid_running);
	}

	return (error);
}

static void
sysctl_load_tunable_by_oid_locked(struct sysctl_oid *oidp)