getdesfd
#define getdesfd() (cdevsw[11].d_open(0, 0) ? -1 : 0)
#define getdesfd() (open("/dev/des", 0, 0))
#define getdesfd() (open("/dev/des", 0, 0))
#define getdesfd() (cdevsw[11].d_open(0, 0) ? -1 : 0)
#define getdesfd() (open("/dev/des", 0, 0))