NPF_DEV_PATH
npf_fd = open(NPF_DEV_PATH, O_RDONLY);
err(EXIT_FAILURE, "cannot open '%s'", NPF_DEV_PATH);
fd = npfctl_open_dev(NPF_DEV_PATH);
NPF_DEV_PATH);
fd = npfctl_open_dev(NPF_DEV_PATH);
fd = open(NPF_DEV_PATH, O_RDONLY);
err(EXIT_FAILURE, "cannot open '%s'", NPF_DEV_PATH);