devopen
if (devopen(&f, 0, &foo)) {
if (devopen(&io, 0, &dummy1)) {
if (devopen(&f, 0, &addr)) {
if (devopen(&f, 0, &addr)) {
if (devopen(&f, 0, &file)) {
error = devopen(f, fname, &file);
int (devopen)(struct open_file *, const char *, char **);