Penv_iter
if (Penv_iter(t->t_pshandle, print_env,
(void) Penv_iter(pr, build_env, datap);
(void) Penv_iter(pr, build_env, datap);
if (Penv_iter(P, getenv_func, &d) == 1) {
extern int Penv_iter(struct ps_prochandle *, proc_env_f *, void *);