pw_tmp
else if ((tfd = pw_tmp(-1)) == -1)
int pw_tmp(int _mfd);
if ((tfd = pw_tmp(-1)) == -1) {
if ((tfd = pw_tmp(-1)) == -1) {
if ((tfd = pw_tmp(-1)) == -1) {
if ((tfd = pw_tmp(-1)) == -1) {
if ((tfd = pw_tmp(pfd)) == -1) {