DEV_IO
if (chmod(DEV_IO, saved_perms) < 0)
err(-1, "priv_io_cleanup: chmod(%s, 0%o)", DEV_IO,
if (stat(DEV_IO, &sb) < 0) {
warn("priv_io_setup: stat(%s)", DEV_IO);
if (chmod(DEV_IO, NEW_PERMS) < 0) {
warn("priv_io_setup: chmod(%s, 0%o)", DEV_IO, NEW_PERMS);
fd = open(DEV_IO, O_RDONLY);