pool_list_iter
if (pool_list_iter(list, unavail, func, data) != 0)
(void) pool_list_iter(list, B_FALSE, get_stat_flags_cb, &mask);
(void) pool_list_iter(list, B_FALSE, refresh_iostat,
(void) pool_list_iter(list, B_FALSE,
(void) pool_list_iter(list, B_FALSE, print_iostat, &cb);
(void) pool_list_iter(list, B_FALSE, get_namewidth_list, &cb);
ret = pool_list_iter(list, B_TRUE, list_callback, &cb);
extern int pool_list_iter(zpool_list_t *, int unavail, zpool_iter_f, void *);