{
int pkt_fd, dev_fd, cmd;
if ((pkt_fd = open(pkt_device, O_RDONLY | O_CREAT)) == -1) {
if ((pkt_fd = open(pkt_device, O_RDONLY | O_CREAT, S_IRUSR | S_IWUSR)) == -1) {
perror("open packet device");
return;
}