CDEV_DEVICE
printf( "Sent ioctl CDEV_IOCTL1 to device %s%s\n", _PATH_DEV, CDEV_DEVICE);
printf("Written \"%s\" string to device /dev/" CDEV_DEVICE "\n", writestr);
printf("Read \"%s\" string from device /dev/" CDEV_DEVICE "\n", buf);
if ((kernel_fd = open("/dev/" CDEV_DEVICE, O_RDWR)) == -1) {
perror("/dev/" CDEV_DEVICE);