#define _IOC_READ 2U
#define _IOC_WRITE 4U
-#define _IO(a,b) _IOC(_IOC_NONE,(a),(b),0)
-#define _IOW(a,b,c) _IOC(1,(a),(b),sizeof(c))
-#define _IOR(a,b,c) _IOC(2,(a),(b),sizeof(c))
-#define _IOWR(a,b,c) _IOC(4,(a),(b),sizeof(c))
+#define _IO(a,b) _IOC(1U,(a),(b),0)
+#define _IOW(a,b,c) _IOC(4U,(a),(b),sizeof(c))
+#define _IOR(a,b,c) _IOC(2U,(a),(b),sizeof(c))
+#define _IOWR(a,b,c) _IOC(6U,(a),(b),sizeof(c))
#define TCGETA 0x5401
#define TCSETA 0x5402