dev_list_unpack
static int dev_list_unpack(char *, size_t, ri_dev_t **);
if (dev_list_unpack(buf, size, &ap->cpus) != 0) {
if (dev_list_unpack(buf, size, &ap->mems) != 0) {
if (dev_list_unpack(buf, size, &ap->ios) != 0) {